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TW201106021A - Anisotropic light-diffusing film, anisotropic light-diffusing film laminated sheet and production method thereof - Google Patents

Anisotropic light-diffusing film, anisotropic light-diffusing film laminated sheet and production method thereof Download PDF

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Publication number
TW201106021A
TW201106021A TW099109596A TW99109596A TW201106021A TW 201106021 A TW201106021 A TW 201106021A TW 099109596 A TW099109596 A TW 099109596A TW 99109596 A TW99109596 A TW 99109596A TW 201106021 A TW201106021 A TW 201106021A
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Taiwan
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light
diffusing film
film
anisotropic
diffusing
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TW099109596A
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Chinese (zh)
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TWI437278B (en
Inventor
Katsuaki Kuze
Kenji Kawai
Kazumoto Imai
Akihumi Yasui
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Toyo Boseki
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0257—Diffusing elements; Afocal elements characterised by the diffusing properties creating an anisotropic diffusion characteristic, i.e. distributing output differently in two perpendicular axes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/916—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/9165—Electrostatic pinning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/917—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means by applying pressurised gas to the surface of the flat article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/706—Anisotropic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2590/00—Signboards, advertising panels, road signs

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Planar Illumination Modules (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

The present invention provides an anisotropic light-diffusing film, anisotropic light-diffusing laminated sheet and production method thereof. The said anisotropic light-diffusing film has excellent light-transmittance, light-diffusing power, and an anisotropic light-diffusing function, that is focusing light at specific direction and then diffusing. The anisotropic light-diffusing film is characterized by comprising a mixture of at least two non-dissolved thermoplastic resin, and simultaneously satisfying the following properties 1 to 4. (1) Total light transmittance is 66% or more. (2) The haze is higher than 80%. (3) The parallel-light transmittance is below 20%. A transmitted light-diffusing power ratio 1 (DH1/DL1) or 2 (DH2/DL2) is more than 2, which is measured by the method described in the present specification and using a goniophotometer with incident angle of 0 degrees.

Description

201106021 六、發明說明： 【發明所屬之技術領域】 本發明是關於一種異向性光擴散薄膜（aniS〇UQpie light-diffusing film)、其積層薄片及其製造方法。更詳而 言，本發明是關於一種具有特優的光之透射度 (transmittance)與擴散度（diffusing power)、且可將光集光 (light-foe using)於特定方向而加以擴散之所謂的異向性光 擴散功能之異向性光擴散薄膜 '其積層薄片及其製造方法 【先前技術】 近年來，由於LED(發光二極體：Light Emitting Diode) 具有消耗能源少且壽命長等之特徵，從節約能源的觀點而 受到注目，且已被廣泛地用作爲室內照明、車內照明、外 燈、廣告燈及顯示裝置等之照明用光源。然而，由於由LED 光源所發出的光是直進性（指向性）高，對於點狀之狹窄範 圍的照明可達成有效率的照明，但是光之擴散性卻爲不足 。因此，爲使用許多光源來達成廣闊面積之照明，則不得 不採取各個光源是排成點狀形態之照明方式，且若欲獲得 均勻的明亮度時，則必須增加光源數目且配置成稠密的狀 態。例如，在顯示器之照明方面，在以邊光方式實施照明 的情況，若欲獲得均勻的輝度則必須增加LED光源數目， 因此無法有效地利用可達成節約能源之特徵。在此情況下 ’若將一種可使光擴散於特定方向之異向性光擴散性薄膜 在光源之出光部設置成可使光之擴散方向朝邊光之長軸方 201106021 向而擴散時’則可使點狀之光朝邊光之長軸方向使得光擴 散’因此可大幅地減少LED光源之數目。 此外’ LED照明也用作爲廣告媒體或照明等之光源。 在該用途方面，則期望一種可提高裝飾性或裝飾照明性之 具有異向性光擴散性之薄膜。 若欲在廣闊的面獲得均勻的光量分佈，則需要採取各 種必要的措施。 例如’先前已揭述一種用於藉由如下所述構成來解決 輝度不均勻之方法。該構成係配備至少一個一次光源，與 一用於導光來自該一次光源所發出的光、且具有用於入射 來自該一次光源所發出的光之「光入射端面」及用於出射 經加以導光的光之「光出射面」之板狀導光體，該導光體 在該光出射面及其相反側的背面之兩者或一者具備光出射 結構，且在該光出射面及該背面之兩者或一者具有至少一 局部性透鏡列形成部，該局部性透鏡列形成部各自包括至 少一局部性透鏡列，且該局部性透鏡列係形成於與由該一 次光源所發射而入射於該光入射端面的光之中，在最大強 度光的入射位置之輝度分佈的波峰光之方向不相同的方向 者（參閱發明專利文獻1)。 此外，也已揭述一種配備具有在一端形成開口部且其 內側壁則爲光之反射面的光源收容部之燈罩、設置於光源 收容部之發光二極體、以及設置於開口部的前面之顯示板 ，以將來自發光二極體之光加以擴散反射而均勻化之技術（ 參閱發明專利文獻2)。 201106021 並且，也已揭述一種面照明光源，其係配備：用於放 射光之光源；用於傳播來自該光源之光且在其放射方向的 規定位置具有放射面之光學性透明導光體；用於封閉該導 光體之該放射面以外的面之無蓋外罩；設置於該外罩與該 導光體之間的全部之內側反射裝置：以及設置於該放射面 ，用於以規定的比例反射來自該光源之光之放射側反射裝 置（參閱發明專利文獻3)。 揭述於如上所述發明專利文獻1至3之方法是有光源 之結構複雜且經濟效益性差之技術問題。此外，雖然可對 應於面狀之照明，但是卻有難以對應於用作爲例如螢光燈 之管狀照明體之技術問題。 在另一方面，爲提高例如以冷陰極管用作爲光源的顯 示器之輝度均勻性，已揭述各種異向性光擴散薄膜。 例如，已揭述一種將聚酯樹脂加以單軸向延伸之方法（ 參閱發明專利文獻4 :日本發明專利特開第2000-47009號 公報）、將非相溶的熱塑性樹脂加以熔融擠出以製膜之方法 (參閱例如發明專利文獻5等）、及在薄膜表面施加壓紋加 工等之賦型處理以控制表面形狀之方法（參閱發明專利6等 )等。 然而，先前習知的異向性光擴散薄膜，在用作爲使用 LED光源之照明裝置用時，則由於其擴散性不足而尙未達 到可充分地滿足市場要求之水準。特別是由於LED光源是 光之指向性強烈，以致具有光源之光點不至於消失而使得 光源周邊之光量增高（在下文中，有時候也稱爲「光點消失 201106021 性」）之技術問題。因此，若欲抑制該技術問題時，則將導 致照明裝置整體之光量（在下文中，有時候也稱爲「全光量 」）降低之技術問題。 藉由先前習知的方法所獲得異向性光擴散薄膜是只能 滿足如上所述特性中任一者，因此並未能滿足市場要求》 例如，在發明專利文獻4所揭述之方法中，則揭述較 理想的是將擴散透射率控制爲20至70%，此外，在發明專 利文獻5所揭述之方法是霧度低，因此可預期其光點消失 性差。 在另一方面，液晶顯示裝置（LCD)是有效地利用其薄型 、輕量、低功率消耗等特徵，而多半是被用作爲平型面板 顯示器，且其用途在可攜式電話、可攜式個人數位助理 (PDA: Personal Digital Assistant)、個人電腦、電視等資 訊用顯示裝置方面逐年擴大》 液晶顯示裝置爲抑制從光源至面板的光傳播路程中之 損耗、且提高面板之輝度，則在液晶層之下面側配置背光 單元。其中，一種由背面照明液晶層而發光者已普及且被 廣泛地使用，其係視光源之配置方式而大致可區分爲側型 與直下型。 近年來’背光單元不僅是在液晶顯示裝置方面，也被 廣泛地使用在燈具或裝飾照明廣告牌等領域方面。 該背光單元是組合背光與透鏡薄膜、光擴散薄膜及輝 度提高薄膜等各種光學薄膜或擴散板等光學構件，以期望 可提高面板之輝度或提高輝度均句性。通常是使用二至四 201106021 片之構件（參閱例如非發明專利文獻1等）。 例如，已揭述一種用於提高輝度之透鏡薄膜之方法（參 閱例如發明專利文獻6等）。 該方法由於其係利用藉由透鏡的集光功效來謀求提高 輝度，雖然能提高從正面觀看時之輝度，但是從斜向觀看 時之輝度卻比從正面觀看時之輝度爲大幅度地降低。此外 ，價格也爲昂貴。 作爲用於解決如上所述從斜向觀看時之輝度比從正面 觀看時之輝度爲大幅度降低之技術問題的方法，則已揭述 一種除了透鏡薄膜又倂用兩片光擴散薄膜之技術（參閱例 如發明專利文獻7)。 此外，由於僅使用一片如上所述透鏡薄膜時，則輝度 均勻性不足夠，因此已揭述一種組合該透鏡薄膜與異向性 光擴散薄膜之技術（參閱發明專利文獻8)。 此外，雖然已揭述一種在如上所述透鏡薄膜更進一步 倂用輝度提高薄膜之方法（參閱例如發明專利文獻9等）， 但是對於輝度之角度相依性減少的功效卻不顯著。 近年來，已演變成由於背光裝置之性能提高而得以顯 現高輝度，且在大型TV或衛星導航系统用途方面，則比 正面輝度之高低更強烈地要求改善輝度之角度相依性。 此外，也演變成強烈地要求藉由減少構件等來降低損 耗或成本及裝置之薄型化等。 因此，也正在檢討對於單一基材薄膜本身賦予光擴散 性的嘗試（參閱例如發明專利文獻1 〇)。 201106021 然而，在發明專利文獻12所揭述之薄膜是擴散度卻爲 小，其係意謂其面內輝度均質性或圖案遮蔽性等爲不足夠 〔先前技術文獻〕 (發明專利文獻） (發明專利文獻1)日本發明專利特開第2002-343 1 24號公報 (發明專利文獻2)日本發明專利特開第2003-1 86427號公報 (發明專利文獻3)日本發明專利特開第2008-027886號公報 (發明專利文獻4)日本發明專利特開第2000-47009號公報 (發明專利文獻5)日本發明專利特開第2003-90906號公報 (發明專利文獻6)日本發明專利特開第2004-4970號公報 (發明專利文獻7)日本發明專利特開第2008-256797號公報 (發明專利文獻8)日本發明專利特開第2006-25 13 95號公報 (發明專利文獻9)日本發明專利特表平第09-506985號公報 (發明專利文獻10)日本發明專利特開第2007-10798號公報 (非發明專利文獻） (非發明專利文獻1)內田龍男校訂「圖解電子顯示器 大全」（日本工業調查會（Kogyo Chosakai Publishing, Inc.) 期刊）第47至48頁。 【發明内容】 〔所欲解決之技術問題〕 本發明之目的是爲解決如上所述在先前技術之問題， 而提供一種具有特優的光之透射度與擴散度、且可將光集 光於特定方向而加以擴散之所謂的異向性光擴散功能之異 201106021 向性光擴散薄膜、其積層薄片及其製造方法。 〔解決問題之技術方法〕 本發明是有鑑於如上所述之狀況所達成者，且終於能 達成解決如上所述之技術問題。 本發明之發明人等經對於一種儘可能抑制來自LED光 源等之高光直進性光源的全光量之降低，且具有高度的擴 散性可在廣闊範圍達成均質的照明，並且具有可使光擴散 於特定方向之所謂的異向性光擴散性之各種照明裝置，尤 其是對於一種適合使用於具有LED等之高直進性光源的照 明裝置用之異向性光擴散薄膜及使用於背光裝置用時，則 比使用先前習知的光擴散薄膜或透鏡薄膜等的情況，在輝 度特性或使用片數等上爲特優之異向性光擴散薄膜專心硏 討結果，終於達成本發明。 所謂的異向性光擴散薄膜、其之積層薄片及製造方法 是包括下列之構成。 1. 一種異向性光擴散薄膜，其特徵爲由至少兩種非相溶 性的熱塑性樹脂之混合物所構成，且同時可符合下列 第（1)至（4)項之特性： (1) 全光線透射率爲66%以上； (2) 霧度（haze)爲超過80%; (3) 平行光線透射率爲低於20% ; (4) 以本說明書中所揭述之方法所測定，且使用變角 光度計以入射角爲〇度所測得透射光之擴散度 比1(DH1/DL1)或擴散度比2(DH2/DL2)中之任 -10- 201106021 —者爲超過2.0 ; (其中’ DH1及DL1是在以自動變角光度計測定、且將 異向性光擴散薄膜之捲繞方向固定於垂直方向及水平 方向來進行測定，所獲得透射光之變角光度曲線之波 峰高度的一半高度之角度的寬度（半値寬度）中，假設 該半値寬度較大者爲DH1，較小者則爲DL1;此外， DH2及DL2是在以自動變角光度計測定、且將異向性 光擴散薄膜之捲繞方向固定於垂直方向及水平方向來 進行測定，所獲得透射光之變角光度曲線之波峰上升 角度與波峰結束角度之間的角度之度數中，假設該角 度之度數較大者爲DH2，該角度之度數較小者則爲 DL2。）。 2_ 如前所述第1項之異向性光擴散薄膜，其中DH2爲110 度以上》 3. 如前所述第1或2項之異向性光擴散薄膜，其中以本 說明書中所揭述之方法，且光擴散薄膜之捲繞方向是 固定於試料固定台之上下方向與平行方向及水平方向 來進行測定，所獲得主擴散方向之光的反曲度爲4至 100% ° 4. 如前所述第1至3項中任一項之異向性光擴散薄膜， 其中如前所述之至少兩種非相溶的熱塑性樹脂之混合 物中至少一種是由聚烯烴系樹脂所構成。 5. 如前所述第4項之異向性光擴散薄膜，其中如前所述 之至少兩種非相溶的熱塑性樹脂之混合物是由兩種以 -11- 201106021 上之聚烯烴系樹脂所構成。 6. 如前所述第5項之異向性光擴散薄膜’其中至少兩種 非相溶的熱塑性樹脂之混合物的主成份是環狀聚烯烴 系樹脂與聚乙烯系樹脂之摻合比例爲10/90至90/10 之混合物。 - 7. 如前所述第5或6項之異向性光擴散薄膜，其係在如 前所述之至少兩種非相溶的熱塑性樹脂之混合物所構 成的光擴散薄膜中至少一面上，積層主要是由聚烯烴 系樹脂所構成的表面層。 8. 如前所述第7項之光擴散薄膜，其中用於形成如前所 述表面層之聚烯烴系樹脂是由含有極性基之聚烯烴樹 脂所構成。 9. 如前所述第8項之異向性光擴散薄膜，其中含有極性 基之聚烯烴樹脂是至少含有羧基者。 10. 如前所述第1至4項中任一項之異向性光擴散薄膜， 其中如前所述之另一種熱塑性樹脂是由氟系樹脂所構 成。 1 1 .如前所述第1至4項中任一項之異向性光擴散薄膜， 其中如前所述之另一種熱塑性樹脂是由聚酯系樹脂所 構成。 12. 如前所述第11項之異向性光擴散薄膜，其係朝一方向 加以延伸2倍以上所構成。 13. —種異向性光擴散薄膜積層薄片，其特徵爲由如前所 述第1至12項中任一項之光擴散薄膜與厚度爲0.1至 -12- 201106021 5 mm、全光線透射率爲70至100 %之塑膠薄片積層所 構成》 14. 如前所述第1至12項中任一項之異向性光擴散薄膜， 其係使用於配備LED光源之點燈裝置。 15. 如前所述第13項之異向性光擴散薄膜積層薄片，其係 使用於配備LED光源之點燈裝置。 16. —種使用LED光源之點燈裝置，其特徵爲如前所述第 1至12項中任一項之異向性光擴散薄膜是安裝於使用 LED光源之照明裝置之出光部的外面或內面。 17. —種使用LED光源之點燈裝置，其特徵爲如前所述第 13項之異向性光擴散薄膜積層薄片是安裝於使用LED 光源之照明裝置之出光部的外面或內面。 18. —種背光裝置，其特徵爲如前所述第1至12項中任一 項之異向性光擴散薄膜是設置於背光單元之出射光面 上。 19. 一種背光裝置，其特徵爲如前所述第13項之異向性光 擴散薄膜積層薄片是設置於背光單元之出射光面上。 20. —種異向性光擴散薄膜之製造方法，用於製造如前所 述第1至12項中任一項之異向性光擴散薄膜，其特徵 爲將至少兩種非相溶性的熱塑性樹脂之混合物加以熔 融擠出成型。 21. 如前所述第20項之異向性光擴散薄膜之製造方法，其 中以擠壓機將熔融樹脂從模頭擠出成薄片狀，並將該 薄片以使用氣體壓力之按壓方法及/或吸引法及/或靜 •13- 201106021 電密著法加以密著且加以冷卻固化來製膜。 〔發明之功效〕 本發明之異向性光擴散薄膜及其積層薄片，由 特優的光之透射度與擴散度、且可將光集光於特定 加以擴散之所謂的異向性光擴散功能，可將LED光 烈的直進性之點狀光轉換成線狀光，因此，在例如 狀之照明時，即使減少LED光源之數目也可達成均 明。 此外，在用作爲廣告媒體或照明等之光源的情 具有可提高裝飾性或裝飾照明性之特徵。 並且，由於直進光之透射率爲小，在用作爲使 光源之照明裝置用時，則可使得未能觀看到強光之 點後，又抑制其光線透射率之降低程度，因此可賦 的異向性光擴散性。 此外，本發明之使用LED光源之照明裝置用異 擴散薄膜積層薄片是可在維持如上所述光學特性下 提高例如耐熱性或強度等非光學特性。 此外，本發明之異向性光擴散薄膜由於具有異 擴散功能、且具有比先前習知的異向性光擴散薄膜 擴散性，在用作爲導光板方式之顯示器之擴散薄膜 具有輝度提高功效爲大之特徵。 因此，可有效地使用於室內之照明、內照式裝 面板之照明、影印機之光照射或液晶顯示器等顯示 照明等之各種照明。 於具有 方向而 源之強 需要線 勻的照 況，也 用LED 光源光 予均勻 向性光 ，又可 向性光 爲高的 時，則 飾照明 裝置之 -14- 201106021 此外，本發明之異向性光擴散薄膜及使用其之積層薄 片，若用作爲背光裝置之光學構件時，則以使用一片即可 賦予高輝度、輝度之角度相依性減少、面內輝度均質性及 圖案遮蔽性等之作爲背光裝置用之光學構件所應具備必要 的光學特性，因此可提高背光裝置之經濟效益性。特別是 可不必使用價昂的透鏡薄膜，且可賦予例如在使用該透鏡 薄膜時，可解決從斜向觀看時輝度會降低之技術問題的大 優點。 此外，本發明之背光裝置是具有接近使用透鏡薄膜的 背光裝置之高正面輝度、且可減少構成使用透鏡薄膜之背 光裝置之技術問題的輝度之角度相依性，因此在使用於例 如大型TV時，具有可抑制由斜方向觀看時之畫面明亮度 降低的優點。 此外，由於具有該特徵，因此可用於例如衛星導航系 统從斜向觀看機會較多的顯示器之背光裝置。 此外，用作爲室內或公司內照明用燈具之背光裝置時 ，則具有可獲得比在使用透鏡薄膜之背光裝置的情況爲更 廣闊範圍之均勻照度的優點。 並且’本發明之背光裝置是以使用一片之構件即可賦 予如上所述之全部特性，因此具有顯著高的經濟效益性的 優點。 因此，本發明之背光裝置是可有效地使用於液晶顯示 裝置、室內之照明、內照式裝飾照明面板等。 此外’根據本發明之異向性光擴散薄膜之製造方法， •15- 201106021 則可具有經濟效益性且穩定地製造具有如上所述特性之本 發明之異向性光擴散薄膜。 【實施方式】 〔本發明之最佳實施方式〕 (光學特性） 本發明之異向性光擴散薄膜（在下文中’有時候也稱爲 「光擴散薄膜（light-diffusingfilm)」。）’其特徵爲由至少 兩種非相溶性的熱塑性樹脂之混合物所構成，且同時可符 合下列第（1)至（4)項之特性： (1) 全光線透射率爲6 6 %以上： (2) 霧度爲超過8 0 % ; (3) 平行光線透射率爲低於20%。 (4) 以本說明書中所揭述之方法所測定，且使用變角光度 計以入射角爲 〇度所測得透射光之擴散度比 1(DH1/DL1)或擴散度比2(DH2/DL2)中之任一者爲超 過 2.0。 (其中，DH1及DL1是在以自動變角光度計測定、且將光擴 散薄膜之捲繞方向固定於垂直方向及水平方向來進行測定 ，所獲得透射光之變角光度曲線之波峰高度的一半高度之 角度的寬度（半値寬度）中，假設該半値寬度較大者爲DH1 ，較小者則爲DL1;此外，DH2及DL2是在以自動變角光 度計測定、且將光擴散薄膜之捲繞方向固定於垂直方向及 水平方向來進行測定，所獲得透射光之變角光度曲線之波 峰上升角度與波峰結束角度之間的角度之度數中，假設該 -16- 201106021 角度之度數較大者爲DH2，該角度之度數較小者則爲DL2 〇 > 〇 在下文中’有時候則將DH之方向稱爲「主擴散方向 j 0 如上所述全光線透射率較佳爲6 8 %以上，更佳爲70% 以上，特佳爲80%以上。此外，在原理上是不可能爲超過 1 00%，因此1 00%則爲其上限。由於全光線透射率是愈高愈 佳，因此更佳爲90%以上，最佳爲100%，但是有可能由於 在界面之反射等而發生損耗，使得實際的上限則受限爲 98%，甚至爲95%，若損耗多時，則也有可能受限爲約93% 的情況。若光線透射率爲小於66%時，則將導致例如由LED 光源所發出的光線之透射率降低，使得用作爲照明時之光 量降低，結果導致照明裝置之照度或輝度降低，因此爲不 佳。 如上所述平行光線透射率較佳爲1 〇%以下，更佳爲5% 以下，進一步更佳爲2%以下。此外，在原理上是不可能爲 小於0%，因此0%則爲其下限。若平行光線透射率爲超過 20%時，則例如LED光源之光點消失性將會惡化，導致由 於光源之強光的光點之光量變強，使其無法獲得均質的照 明，因此爲不佳。 在本發明中，薄膜之霧度較佳爲超過8 0%» 該霧度較佳爲90%以上，更佳爲95%以上，進一步更 佳爲97%以上。此外，在原理上是不可能爲超過1〇〇%，因 此1 0 0 %則爲其上限。 -17- 201106021 若霧度爲小於80%時’則光之擴散性將會降低’以致 無法達成廣闊的範圔且均質的照明’因此爲不佳。若欲達 成廣闊的範圍且均質的照明時’則必須增加LED光源之數 目，因此在經濟效益上則將變得不利。此外，也必須增大 光源與異向性光擴散薄膜之距離，因此在照明裝置之薄型 化將會受到限制。 在本發明中，較佳爲以如下所述方法所測定之透射光 之擴散度比1(DH1/DL1)或擴散度比2(DH2/DL2)中之任一 者爲超過2.0(其中，DH1及DL2是在以自動變角光度計測 定、且將光擴散薄膜之捲繞方向固定於垂直方向及水平方 向來進行測定，所獲得透射光之變角光度曲線之波峰高度 的一半高度之角度的寬度（半値寬度）中，假設該半値寬度 較大者爲DH1，較小者則爲DL1 ;此外，DH2及DL2是在 以自動變角光度計測定、且將異向性光擴散薄膜之捲繞方 向固定於垂直方向及水平方向來進行測定，所獲得透射光 之變角光度曲線之波峰上升角度與波峰結束角度之間的角 度之度數中，假設該角度之度數較大者爲DH2，該角度之 度數較小者則爲DL2。）。 在本發明中，只要是擴散度比1或2中任一者爲超過 2.0即可，但是若兩者同時爲超過2.0時，則將可更進—步 地提高異向性之程度，因此爲較佳。亦即，在本發明中， 所謂的「擴散度比1或擴散度比2(DH2/DL2)中任一者爲超 過2.0」是意謂擴散度比1或2中至少任一者爲超過2〇的 狀態’而以兩者同時爲超過2.0的狀態爲其較佳的狀態者 •18- 201106021 如上所述擴散度比1(DH1/DL1)、擴散度比2(DH2/DL2) 中任一者皆爲代表光之異向性指標。代表光擴散之異向性 程度，先前一直在使用擴散度比1。然而，即使在擴散度 比1爲小於2 · 0時，則也有會顯現強烈的光擴散之異向性 薄膜，因此經針對於薄膜之光擴散特性而專心檢討的結果 ，發現擴散度比2在代表擴散薄膜的異向性程度上也是重 要。換言之，其係當解決技術問題時，不僅是如半値寬度 之光量比較大的範圍，也應考慮光在光量爲低的部份究竟 會以多少角度擴散者。 如上所述擴散度比較佳爲擴散度比1或2中任一者爲 2.5以上，更佳爲3.0以上。若擴散度比1或2之兩者爲2.0 以下時，則光之擴散之異向性變低，使得集光於特定方向 之程度降低而降低光擴散異向性，因此爲不佳。 上限是並無特殊限制，但是在實務應用上較佳的範圍 爲擴散度比1、2中任一者也爲約20，更佳爲約15。 由於符合該特性，則可控制擴散於特定方向之程度， 因此可賦予以等向性擴散薄膜所無法達成的光之擴散功效 。例如，在以線狀配置LED光源之照明裝置中，若將異向 性光擴散薄膜之主擴散方向配置成與LED光源之排列方向 成正交的方向來使用時，則可將原爲點狀的LED光源之光 轉換成朝LED光源之排列方向呈直線狀之均勻的光帶。在 另一方面，若將主擴散方向配置成與LED光源之排列方向 成平行的方向來使用薄膜時，則可將原爲點狀的LED光源 -19- 201106021 之光僅集中於與LED光源之配列方向成正交的方向而加以 擴散。並且，由於平行光線透射率、霧度及擴散度是設定 於適度的範圍，LED光源之光點視認性則將降低，且LED 光源之顯眼度亦將受到抑制。 此外，使用於背光裝置時，由於比等向性光擴散薄膜 更進一步地提高集光性，也有可能增大輝度提高幅度的情 況。 此外，如上所述擴散度比是藉由如下所述方法所測定 者。 <透射光之擴散度比之測定方法> 使用自動變角光度計（GP-200、村上色彩技術硏究所股 份有限公司（Murakami Color Research Laboratory Co.， Ltd.)製造）來進行測定。 以透射測定模式、光線入射角：0°(對於試料面成上下 、左右皆爲直角之角度）、受光角度：一90°至90°(赤道線 面上之角度）、濾光片：使用ND10、光束光圈（diaphragm) :10.5 mm(VS-l 3.0)、受光光圈：9.1 mm(VS-3 4.0)及變角 間隔爲0.1度之條件進行測定，並變更SENSITIVITY或 HIGH VOLT ON之設定使得透射光之波峰頂成爲圖之40至 90%來測定。藉此，可測得透射光之變角光度曲線之波峰 高度的一半高度之角度的寬度（半値寬度）。 如上所述之測定是將異向性光擴散薄膜之捲繞方向固 定於垂直方向及水平方向來進行測定，並將所獲得半値寬 度爲較大者假設爲DH1、較小者則爲DL1來計算出擴散度 -20- 201106021 比1(D HI/DL1)。此外，將波峰上升角度與波峰結束角度之 間的角度之度數爲較大者假設爲DH2、較小者則爲DL2來 計算出擴散度比2(DH2/DL2)(參閱第1圖）。該波峰上升及 結束角度是以10倍之放大鏡觀察該部份，並以該波峰之線 會消失的最先端處之角度視爲各自之角度。如此，即可下 明確的判斷。 若光擴散薄膜之表面粗糙度有差異存在時，則如上所 述測定是以實際使用時光會通過的方向加以固定來進行測 定。 另外，將移動受光器之面定義爲「赤道面」。 本發明之異向性光擴散薄膜是更進一步如上所述DH2 較佳爲1 1 0度以上，更佳爲120度以上。若DH2爲小於1 1 0 度時，則該方向之光擴散性將降低，使得不易在廣闊的範 圍獲得均質的照明，因此爲不佳。若欲在廣闊的範圍達成 均質的照明時，則例如必須增加LED光源之數目’如此將 在經濟效益上造成不利。此外，也必須增大光源與異向性 光擴散薄膜之距離，因此在照明裝置之薄型化將會受到限 制。 在本發明中，若欲將如上所述特性之異向性光擴散薄 膜用作爲背光裝置用、且有效地顯現本發明之功效時，則 藉由如下所述方法所測定的光之反曲度較佳爲4至1 0 0 %。 (光之反曲度） 在本發明之光之反曲度是藉由下列方法測定所獲得者 -21- 201106021 <光之反曲度之測定方法> 使用自動變角光度計（GP-200、村上色彩技術硏究所股 份有限公司製造）來進行測定。 以透射測定模式、光線入射角：0。（對於試料面成上下 、左右皆爲直角之角度）、受光角度：一 90。至90。（赤道線 面上之角度）、濾光片：使用 ND10、光束光圈：10.5 mm(VS-l 3.0)、受光光圏：9.1 mm(VS-3 4.0)及變角間隔爲 〇.1度之條件進行測定，並變更 SENSITIVITY或HIGH VO LTON之設定使得透射光之波峰頂成爲圖之40至90%來 測定。測出所獲得透射光之變角光度曲線在角度爲0度之 高度（H0)。測出除了變更光線入射角爲6〇。（赤道線面上之 角度）以外，其餘則以與如上所述條件相同的條件測定時之 透射光之變角光度曲線在角度爲0度之高度（H 60)。使用藉 由該方法所測得之H60與H0，並以下式計算得反曲度（參 閱第2圖）。 光之反曲度=Η60/Η〇χ 1 00(%) (1) 此外，定義移動受光器之面爲赤道面。 該光之反曲度是在主擴散方向進行測定所獲得。 若光擴散薄膜之表面粗糙度有差異存在時，則固定於 光會通過與實際使用於背光裝置時之方向相同的方向來進 行測定。 如上所述光之反曲度較佳爲6%以上，更佳爲8%以上 。反曲度之上限較佳爲100%，但是在實務應用上則爲80% 以下，進一步爲70%，甚至爲60%以下，且視情況而定也 -22- 201106021 有可能變成5 5 %以下的情況。 若光之反曲度爲小於4%時，在僅以一片 薄膜用作爲背光裝置用之光學構件的情況， 無法賦予作爲高輝度、輝度之角度相依性減 光裝置用之光學構件所應具備必要的光學特 此爲不佳。 其係意謂與提高輝度有關係的是究竟可 光源以斜方向所入射於光擴散薄膜之光出射 由於在背光內的散射的狀態是視背光之種類 在如上所述之範圍內來調整反曲度，即可獲 〇 該特性係代表例如光入射於異向性光擴 在薄膜中的反曲功效之程度，亦即，代表以 之光朝正面出光之程度的尺度。從某一種意 視爲一種用於代表集光功效之尺度。本發明 係比先前習知的光擴散薄膜或透鏡薄膜具有 效。因此可有效地顯現本發明之如上所述功 例如，當將本發明之異向性光擴散薄膜 示器用之背光裝置時，即使僅用一片，也可 度相依性減少、提高面內輝度均質性或提高 之各種特性。 先前係使用透鏡薄膜、光擴散薄膜（薄J ，而在各自構件僅使用一片時，則一直只能 特性中之任一部份，因此，則以使用一片薄 異向性光擴散 則有可能導致 少等之作爲背 性的情況，因 將多少由背光 於正面方向* 而不同，藉由 得最適的輝度 散薄膜時，光 高角度所入光 義上來說也可 之光擴散薄膜 極大之反曲功 效。 用作爲液晶顯 符合輝度之角 圖案遮蔽性等 V )及光擴散板 符合如上所述 膜也能賦予如 •23- 201106021 同時可符合全部特性之理想特性，此是本發明之異向性光 擴散薄膜所首創。 何以能賦予該理想特性之理由，雖然並不清楚，但是 可推測爲由於同時可符合如上所述數項之光學特性始能達 成。例如’光之反曲度爲高是對於輝度之角度相依性、而 擴散度爲高是對於面內輝度均質性或圖案遮蔽性之貢獻大 的緣故。 (異向性光擴散薄膜之構成） 本發明之異向性光擴散薄膜較佳爲由至少兩種非相溶 性的熱塑性樹脂之混合物所構成。 如上所述至少兩種非相溶性的熱塑性樹脂之混合物的 存在形態是只要其爲能符合如前所述光學特性時，則並無 特殊限制。可爲各自樹脂作爲連續相及分散相而獨立存在 之所謂的「海/島結構」、或兩樹脂形成「共連續相」之結 構。由於在兩樹脂之界面的光之折射或散射，則可賦予如 上所述特性。 (至少兩種非相溶性的熱塑性樹脂之混合物） 在本發明中使用於至少兩種非相溶性（互不相溶）的熱 塑性樹脂之混合物的「熱塑性樹脂」是包括：例如，聚乙 烯系樹脂、聚丙烯系樹脂、聚丁烯系樹脂、環狀聚烯烴系 樹脂及聚甲基戊烯系樹脂等之聚烯烴系樹脂、聚酯系樹脂 、丙烯酸系樹脂、聚苯乙烯系樹脂、聚碳酸酯系樹脂、氟 系樹脂及此等之共聚物等》 從此等熱塑性樹脂中選擇至少兩種即可，但是在兩種 -24 - 201106021 樹脂中之一樹脂較佳爲聚烯烴系樹脂、聚酯系樹脂及氟系 樹脂等。其可參酌光學特性、其他要求特性或經濟效益性 等來適當地選擇。 如上所述至少兩種非相溶性的熱塑性樹脂之摻合比例 ，以各自之重量比計則較佳爲10/90至90/10,更佳爲20/80 至80/20，進一步更佳爲3 0/70至70/30之比例，但是其係 視樹脂成份之種類及如後所述之層構成、光擴散層之厚度 及製造方法等而會大幅度地變化。 槪括言之，是否由於兩種非相溶性的熱塑性樹脂之界 面數減少所導致，重量比愈離開5 0/5 0，則愈有全光線透射 率降低、霧度降低、平行光線透射率上升的傾向。 此外，若在島成份之熔融流動率爲低的情況，則有可 能不易以在模頭內之剪力或牽伸來施加使得島成份變細之 力，而導致異向性降低的情況’該傾向是重量比愈離開 5 0/50則愈變強。可在考慮此等傾向下進行調整各特性。 此外，兩種非相溶性的熱塑性樹脂之摻合比例爲多者 ，則有變成連續相的傾向。特別是在熔融流動率爲相接近 時，則也需要考慮及海島結構之成份有可能由於比率而逆 轉。 如上所述樹脂可從一般市售的高泛用性樹脂中選擇， 但是也可爲進行更穩定的生產等而使用特訂品。 從容易達成如上所述光學特性、且具有特優的除了光 學特性以外之機械特性或熱特性的觀點來考慮，則聚酯系 樹脂較佳爲使用聚對苯二甲酸乙二醇酯、聚對苯二甲酸丁 -25- 201106021 二醇酯、聚萘二甲酸乙二醇酯、聚萘二甲酸丁二醇酯之均 聚物及/或共聚物。此外，在經濟效益上也佔有優越的地位 0 可與聚酯組合之樹脂較佳爲如後所述之聚烯烴系樹脂 〇 此外，氟系樹脂也是只要可符合如上所述特性時，則 並無特殊限制，但是基於容易達成如上所述光學特性、且 在經濟效益上也具有優越地位的理由，則較佳爲使用偏二 氟乙烯系樹脂及全氟乙烯等之含氟單體與乙烯或丙烯等之 烯烴系單體之共聚物。 該氟樹脂是具有特優的耐光性，例如經與聚烯烴系樹 脂組合，則可獲得具有特優的耐光性之異向性光擴散薄膜 〇 可與氟系樹脂組合之樹脂較佳爲如後所述之聚烯烴系 樹脂。 從可穩定地顯現如上所述特性的觀點來考慮，特別是 可滿足例如全光線透射率與霧度、平行光線透射率及擴散 度比兩者並存之自相矛盾現象的觀點來考慮，則較佳爲至 少一種是由聚烯烴系樹脂所構成。 聚烯烴系樹脂是包括：聚乙烯、聚丙烯、聚丁烯、聚 戊烯、聚己烯、聚甲基戊烯等或此等之共聚物、環狀聚烯 烴等。 從耐光性或經濟效益性的觀點來考慮，則較佳爲兩種 皆使用聚儲烴系樹脂。在兩種皆使用聚烯烴系樹脂的情況 -26- 201106021 ’其組合方式是並無特殊限制，但是較佳爲設定兩種聚烯 烴系樹脂之折射率差爲在0.003至0.07之範圍，更佳爲在 0.005至0.05之範圍’進一步更佳爲在〇.〇1至〇.〇2之範圍 。經將折射率差設定爲在該範圍，則可更穩定地獲得如前 所述光學特性之光擴散薄膜。例如，折射率差爲超過〇.〇7 時’則有利於將霧度或平行光線透射率控制在如前所述範 圍’但是卻不易維持全光線透射率之均衡》在另一方面， 若爲小於0.003時，雖然容易達成全光線透射率，但是卻 不易維持與霧度或平行光線透射率之均衡。 其係若折射率差愈大，則在兩種非相溶性的熱塑性樹 脂之界面之角度變化愈大，因此雖然有利於擴散，但是在 另一方面，在界面之反射則將會以指數函數模式地增加的 緣故。 因此，在如上所述範圍內，則可容易地同時可符合如 前所述各種光學特性。 此外，在如上所述的情況，爲穩定生產，則較佳爲島 相之折射率是比海相之折射率爲高。其係推測爲島相折射 率爲高者，在光從海相入射於島相時，則不易在界面發生 全反射，光可有效地進行透射，使得不易受到由於製膜裝 置之差異或生產條件的海島結構之變化的影響。若海相之 折射率比島相之折射率爲高且其之差爲大時，則有可能導 致全反射之比例增大，使得在薄膜內之光學特性斑容易發 生、或不易進行穩定生產的情況。 另外，即使在兩種皆非爲聚烯烴系樹脂的情況，也會 -27- 201106021 顯現相同的傾向。 雖然理由並不清楚，環狀聚烯烴系樹脂與聚乙烯系樹 脂之組合是可穩定地達成如上所述光學特性’特別是可使 得如上所述自相矛盾特性並存，因此爲較佳。此外，也具 有特優的經濟效益性。 環狀聚烯烴系樹脂是包括：例如，降冰片烯（降莰烯） 或四環十二碳烯等具有環狀之聚烯烴結構。此等是可提高 玻璃轉移溫度，可使得由於在模頭內之剪力或牽伸而變細 的島成份在冷卻時獲得快速的固化，因此易於顯現穩定的 特性。 玻璃轉移溫度較佳爲1 0 〇°C以上，更佳爲1 1 0 °c以上， 特佳爲1 20°c以上。上限係自然而然地視單體種類而定（環 狀單體100%之Tg)，但是較佳爲230°c以下，更佳爲200。〇 以下，特佳爲1 90°C以下。若超過上限時，則在熔融擠出 時需要高溫’因此有可能導致著色或發生未溶解物的情況 。此外，該値是根據ISO 1 1 3 5 7- 1，-2, -3準則以1 〇°C /分鐘 之升溫速度測定所獲得之値。 環狀聚烯烴系樹脂是包括：例如’（1)將降冰片烯系單 體之開環（共）聚合物，視需要經順丁烯二酸加成、經環戊 二烯加成之高分子改質後，加以氫化所獲得之樹脂；（2)將 降冰片烯系單體進行加成型聚合所獲得之樹脂；（3)將降冰 片烯系單體與乙烯或α_烯烴等之烯烴系單體進行加成型共 聚合所獲得之樹脂等。聚合方法及氫化方法是可以慣用方 法來實施。 -28- 201106021 環狀聚烯烴系樹脂之環狀成份的含量較佳爲70至90 質量％，更佳爲7 3至8 5質量％。特別是在降冰片烯系的情 況，則較佳爲在此範圍。 特別是與乙烯共聚合所獲得環狀聚烯烴系樹脂是與聚 乙烯系樹脂之親和性高，因此在達成特性上則爲較佳。 乙烯的含量較佳爲30至10質量％，更佳爲27至15 質量％。 聚乙烯系樹脂是可爲均聚物或共聚物。在共聚物的情 況，則較佳爲5 0莫耳％以上是乙烯成份》 該樹脂之密度或聚合方法等也並無特殊限制，但是較 佳爲使用密度爲0.909以下之共聚物，其包括：例如，與 丙烯、丁烯、己烯及辛烯等之共聚物。聚合方法是可爲二 茂金屬觸媒法及非二茂金屬觸媒法中任一種。 特別是由於可穩定地賦予高擴散性，較佳爲使用乙烯 與辛烯之嵌段共聚物。例如，該樹脂是包括陶氏化學公司 (T h e D 〇 w C h e m i c a 1 C 〇 m p a n y)製造之 IN F U S E (商標名）。該 樹脂，由於其係嵌段結構，具有結晶性之部份，雖然爲低 密度，但是卻有爲高熔點之特徵，因此可提高所獲得異向 性光擴散薄膜之耐熱性等，因此爲較佳。 在環狀聚烯烴系樹脂與聚乙烯系樹脂之組合的情況， 較佳爲在全部樹脂量中摻合10至60質量％，更佳爲10至 5 0質量％之環狀聚烯烴系樹脂者。該範圍是在實現以如後 所述聚乙烯系樹脂爲海相的實施模式上爲較佳的範圍。 藉由滿足如上所述範圍、且滿足如後所述要件，即可 -29- 201106021 穩定地獲得具有如前所述較佳的光學特性之異向性光擴散 薄膜。 用作爲如上所述之至少兩種非相溶性的熱塑性樹脂的 熱塑性樹脂之熔融流動率，較佳爲在各熱塑性樹脂之熔融 流動率之間有所差異。藉由採取此等方式，則可穩定地賦 予如前所述之光學特性。 如上所述樹脂之熔融流動率是考慮及樹脂之組成、組 成比、欲將何種樹脂作爲海及吾所欲之光學特性等加以適 當地選擇。 其指標是組成比例爲多、且熔融流動率爲高者則將成 爲海。若爲同量時，則以熔融流動率爲高者容易變成爲海 。組成比例爲高者，若熔融流動率爲高時，則有可能導致 非爲單純的海/島結構，而形成例如共連續相的情況。 在環狀聚烯烴系樹脂與聚乙烯系樹脂之組合的情況， 則較佳爲以.聚乙烯系樹脂作爲海相，且使該海相之聚乙烯 系樹脂的熔融流動率高於島相之環狀聚烯烴系樹脂的熔融 流動率。 在與如上所述構成爲相反的構成，以環狀聚烯烴系樹 脂作爲海相的情況，則由於在模具內之剪力、海相之柔軟 性或流動性的影響，而不易獲得吾所欲之光學特性，特別 是擴散度比爲高之異向性光擴散薄膜。 由於如上所述實施模式，即使在變更製膜裝置的情況 ，也可顯現穩定地獲得吾所欲之光學特性，特別是擴散度 比爲高之異向性光擴散薄膜的功效。 -30- 201106021 在達成本發明之技術過程中，將相同的樹脂組成物在 變更製膜裝置下，即使以同等之條件進行製膜時，則也有 無法再現所獲得異向性光擴散薄膜之光學特性的情況。經 就解決該技術問題而專心硏討結果，發現藉由如上所述實 施模式即可改善該技術問題。 在另一方面，在以與如上所述構成爲相反的構成，以 環狀聚烯烴系樹脂作爲海相的情況，則發現容易出現如上 所述問題。其理由雖然並不清楚，但是可推測爲：即使因 變更製膜裝置時所發生擠出條件之差異或模具形狀之差異 而有剪力等的變化，經使海相之樹脂比島相樹脂爲柔軟、 且提高其流動性，藉此則可緩和其之影響。 (積層由聚烯烴樹脂所構成之層） 在本發明中，在如前所述之至少兩種非相溶性的熱塑 性樹脂之混合物中兩種皆使用聚烯烴系樹脂的情況，則較 佳的實施模式爲在由至少兩種聚烯烴系樹脂混合物所構成 之層的至少一面上，積層主要是由聚烯烴系樹脂所構成的 表面層者。在下文中，有時候則將由至少兩種聚烯烴系樹 脂之混合物所構成之層稱爲「光擴散層」。 由於形成如上所述之表面層，在進行熔融擠出製膜時 ，則可抑制發生於模具出口，例如被稱爲「眼屎」之發生 在模具出口的由樹脂劣化物所造成之附著物，使其可長時 間進行穩定的連續製膜，因此爲較佳。此外，也可抑制在 使用乙烯與辛烯之嵌段共聚物等之柔軟性聚烯烴系樹脂時 所發生的異向性光擴散薄膜之黏連性，因此爲較佳。 -31- 201106021 用於形成如上所述表層之聚烯烴系樹脂，由於可顯現 抑制黏連性等之功效等，因此較佳爲使用結晶性之樹脂。 用於形成如上所述表層之聚烯烴系樹脂，較佳的模式 爲使用含有極性基之聚烯烴樹脂。藉此，則可提高異向性 光擴散薄膜與其他原材料之接著性，因此爲較佳。例如， 在製造如後所述之光擴散薄膜積層薄片時，則可期望提高 與塑膠薄片之接著性，因此爲較佳。此外，也可賦予與被 廣泛用作爲光學用之材料的丙烯酸系樹脂或聚碳酸酯系樹 脂之熱接著性，因此爲較佳。 如上所述含有極性基之聚烯烴樹脂較佳爲含有在乙烯 、丙烯、丁烯、己烯、辛烯、甲基戊烯及環狀烯烴中至少 一種單體作爲其之骨架。 可爲使用一種如上所述單體之均聚物、或使用兩種以 上單體之共聚物。 在本發明之如上所述含有極性基之聚烯烴樹脂較佳爲 含有至少一種極性基。「極性基」是包括：羧酸基、磺酸 基、膦酸基、羥基、縮水甘油基、異氰酸酯基、胺基、醯 亞胺基、噁唑啉基、酯基、醚基、羧酸金屬鹽基、磺酸金 屬鹽基、膦酸金屬鹽基、三級胺鹽基或四級胺鹽基等。該 極性基是可含有一種或兩種以上。 根據用於構成光擴散層的聚烯烴系樹脂之組成或密著 對象之構件的種類或必要的密著力等來適當地選擇即可。 較佳的實施模式是至少含有羧基者。 此外，在本發明之含有極性基之聚烯烴樹脂是可爲將 -32- 201106021 極性基直接導入於聚烯烴樹脂之高分子鏈中者，或也可爲 經導入於其他樹脂’然後添加並加以混合所獲得之狀態者 。此外，視情況而定，本發明之聚烯烴樹脂是也可使用一 種將可與經導入於其分子鏈之末端或內部的羧酸基或羥基 等進行反應之化合物與此等進行反應來加.以改質者。 在本發明中’如上所述之含有極性基之聚烯烴樹脂是 可使用單獨一種、或摻合兩種以上之摻合組成物。此外， 也可爲未含有極性基之聚烯烴樹脂或摻合其他種類之樹脂 之摻合組成物。在該摻合組成物的情況，該含有極性基之 聚烯烴樹脂較佳爲含有1 0質量％以上，更佳爲含有3 0質 量％以上。 如上所述之含有極性基之聚烯烴樹脂較佳爲結晶性之 樹脂。 較佳爲使用熔點爲100至180 °c者。 如上所述之含有極性基之聚烯烴樹脂是只要其爲具有 如上所述特性時，則並無特殊限制，但是可使用例如已市 售作爲接著性聚烯烴系樹脂之樹脂。例如，ADMER樹脂（ 商標名、三井化學股份有限公司（Mitsui Chemicals，Inc.) 製造）、Modic樹脂（商標名、三菱化學股份有限公司 (Mitsubishi Chemical Corp.)製造）、或 ADTEX 樹脂（商標名 ，日本聚乙嫌股份有限公司（Japan Polyethylene Corp.)製造 )、及BONDFAST樹脂（商標名，住友化學股份有限公司 (Sumitomo Chemical Co·，Ltd.)製造）等，但是並不受限於 此等。 -33- 201106021 藉由在如上所述之光擴散層上積層由含有極性基之聚 烯烴樹脂所構成之層，則可比僅由單層之光擴散層所構成 的光擴散薄膜更提高與其他原材料之接著性。此外，也有 可能使得薄膜之抗黏連性或滑動性獲得改善、光擴散薄膜 之操作使用性等獲得改善的情況。此外，也可賦予與各種 原材料之熱接著性。 本發明之異向性光擴散薄膜是可使用一片、或兩片以 上疊合使用。在兩片以上疊合使用時，則可單純地疊合使 用、或可使用接著劑或黏著劑貼合使用。 在兩片以上疊合使用時，各自薄膜使用如前所述未符 合本發明之特性之光擴散薄膜，而藉由疊合來符合如前所 述本發明之特性之方式也應包括在本發明範圍內》採取該 方法時，較佳爲以主配向方向爲一致的方向貼合。在以主 配向方向未成一致的方向，例如以正交方向貼合時，則有 可能導致異向性降低，而無法符合如前所述特性的情況， 因此爲不佳。 此外，也可將本發明之異向性光擴散薄膜與具有其他 特性之光擴散薄膜或透鏡薄膜等之其他光學薄膜疊合使用 。在該使用方法的情況，則可單純地疊合使用、或以接著 劑或黏著劑貼合使用。 (異向性光擴散薄膜之製造方法） 本發明之異向性光擴散薄膜之製造方法，若能符合如 上所述之光學特性時’則也並無特殊限制，但是從經濟效 益性的觀點來考慮，則較佳爲以熔融擠出成型來製膜之方 -34- 201106021 法》 在本發明中，由於不需要爲賦予光擴散性而含有非熔 融性微粒，即使以熔融擠出成型法來實施，也可減少在製 膜製程中熔融樹脂在過濾器濾網發生堵塞，因此具有生產 性爲特優同時所獲得薄膜之清晰度也爲高之特徵。 藉由如上所述熔融擠出成型法之製膜方法是並無特殊 限制，例如可爲T-模法及充氣膨脹法中任一者。此外，也 可爲未經延伸的狀態之薄膜、或施加延伸處理者。 如上所述熔融擠出成型法，通常是採取以擠壓機將熔 融之樹脂從模頭擠出成薄片狀後，將該薄片密著於冷卻輥 使其冷卻固化之方法進行製膜。 在本發明之異向性光擴散薄膜之製造中，在進行對於 如上所述之冷卻輥密著時，較佳爲在該密著部之入口部份 不至於°形成積液區（reservoir zone)(也被稱爲「淺灘（bank) 」）。該積液區之形成是若在對於冷卻輥密著時受到壓接時 始會發生，亦即，受到強烈的壓力按壓時始會發生，因此 較佳爲降低該密著時之密著壓力。例如，較佳爲避免使用 一般被廣泛使用的以加壓輥壓接來使其密著之方法。 只要是使用弱的壓力加以密著之方法時，則並無特殊 限制，但是較佳爲例如將經擠壓機加以熔融之樹脂由模頭 擠出成薄片狀，然後將該薄片以使用氣體壓力之按壓方法 及/或吸引法及/或靜電密著法加以密著且加以冷卻固化來 製膜所構成者。由於該方法可穩定地獲得如前所述較佳的 光學特性，特別是可穩定地獲得如前所述特性之一的擴散 •35- 201106021 度比爲高之異向性光擴散薄膜。 先前擴散度比由於所使用的製造裝置之差異等影響而 大幅度地變化，使其無法進行穩定生產的情況。因此，經 針對於可穩定生產的製造方法專心硏討結果，發現較佳爲 採取以如上所述之製造方法來製造。該理由雖然並不清楚 ，但是可推測爲如下所述者。 擴散度比是大幅度地受到在光擴散層的兩種非相溶樹 脂所形成的相結構之影響支配。例如，在海/島結構的情況 ，則受島形狀之異向度的支配。擴散度比是與該島形狀之 異向度成比例地增高。亦即，若欲提高擴散度比，則較佳 爲提高島形狀之異向度。 藉由熔融擠出法擠出的薄片中之島成份的形狀是由於 在模頭內受到剪力而以配向於擠出方向之形態變細。並且 ，由模頭擠出後，該薄片以熔融狀態受到牽伸，使得島形 狀更朝擠出方向變細。較佳爲在此狀態下加以冷卻固化。 然而，若採取以加壓輥等壓接於冷卻輥之方式以高壓力按 壓時，由於該壓接部之入口部份的薄片處於尙未固化狀態 而在壓接部之入口部份形成積液區，使得未固化狀態之樹 脂滯留於該區，因此已朝擠出方向變細之島成份則由於表 面張力而受到恢復成本來形狀之等向性液滴之力，使得異 向度緩和而變形成更加趨向於等向性之形狀。並且，由於 以該經變形的形狀加以冷卻固化，島形狀之等向性提高， 其結果光擴散度增加、等向性也增加，因此對於提高擴散 度比造成不利的影響。 -36- 201106021 如上所述之使用氣體壓力之按壓方法及/或吸引法及/ 或靜電密著法加以密著且加以冷卻固化之方法是並無特殊 限制。例如，使用氣體壓力之按壓方法是包括：例如，以 空氣等之氣體壓力按壓，亦即所謂的「風刀法」等之方法 、以減壓噴嘴吸引以使其密著之「真空室法」、以靜電力 密著之「靜電密著法」等。該方法是可單獨使用、或數種 方法倂用。由於可提高所獲得薄膜之厚度精確度，較佳的 實施模式爲以如後所述方法來實施。 本發明之異向性光擴散薄膜是可以無延伸法及延伸法 之任一方法來製造。例如，光擴散層使用聚酯系樹脂時， 則較佳爲加以單軸向延伸。延伸倍率較佳爲2倍以上。上 限是並無特殊限制，但是較佳爲小於1 0倍。藉此可使得島 相成爲朝延伸方向延伸之細長結構，可顯著地提高與該島 相之配向方向成正交的方向之光擴散性，以確保本發明之 目標異向性及高擴散性。 以無延伸法製造時，則也可將經熔融擠出的薄片在加 以冷卻固化之前進行延伸的方法，亦即，以提高牽伸率的 方法來製造。 此外，本發明之異向性光擴散薄膜是可爲單層或兩層 以上之多層構成。在多層構成的情況，只要其至少一層爲 以如上所述構成的光擴散薄膜所形成之層時，其他層則可 爲未具有光擴散性之單純的透明層。此外，也可爲全部層 皆爲光擴散層之構成。 在如上所述多層構成的情況，則也可以多層共擠出法 -37- 201106021 製造，或以擠出積層法或乾式積層法來實施。 如上所述之至少兩種非相溶性的熱塑性樹脂之混合物 是可將各自之熱塑性樹脂在製膜步驟之擠壓機等中進行摻 合、或預先以捏合法等製成爲混合物之形態來使用。 (作用機制） 如上所述，在本發明中，需要同時可符合例如如前所 述之全光線透射率、平行光線透射率、霧度、擴散度及擴 散度比之許多光學特性》只要是同時可符合此等特性，始 能達成以先前習知的光擴散薄膜所無法達成之高水準的特 性。因此，可獲得適合用作爲例如LED光源用之照明裝置 、或背光裝置用等之高功能光擴散薄膜。 如上所述特性是各自包括會顯現自相矛盾的行爲之特 性。例如，全光線透射率與其他特性則會顯現自相矛盾的 行爲。在另一方面，平行光線透射率、霧度及擴散度在宏 觀上則爲會顯現成比例性的行爲之特性値，但是在微觀上 則無法稱得上是成比例關係。此外，在本發明中，則有必 要提高擴散度比。因此，雖然不易明確地表達各自因素對 於各特性之貢獻，但是經控制如前所述非相溶性樹脂之折 射率差或熔融流動率等之樹脂特性、或各自樹脂之種類或 混合比等爲在如前所述範圍內，且採用如上所述製造方法 ’則可穩定地達成。 本發明之異向性光擴散薄膜之厚度是並無特殊限制。 —般而言，較佳爲10至ΙΟΟΟμηι，更佳爲30至500μιη，但 是視光擴散層之樹脂成份之種類、摻合比、層構成及製造 -38- 201106021 方法等而會大幅度地變化。若將此等因素加以限定時，則 較佳的厚度範圍多半將變成非常狹窄的範圍，且以先前技 術所顯示之厚度範圍則不易同時可符合如前所述之全部光 學特性。槪括地說，膜厚愈厚則愈有全光線透射率降低、 霧度降低、平行光線透射率降低、及擴散度增大的傾向， 因此可在考慮此等傾向下加以調整各特性。 另外，在調整厚度時，若因變更牽伸比、擠出流量、 模唇寬度等而導致海島結構大幅度地變化時，則有可能造 成如上所述之傾向逆轉或極端地變大的情況。 (異向性光擴散薄膜積層薄片） 本發明之另一發明是將藉由如上所述之方法所獲得異 向性光擴散薄膜、與厚度爲0.1至5mm且全光線透射率爲 70至100%之塑膠薄片積層所獲得之異向性光擴散薄膜積 層薄片。 藉由如上所述之方法所獲得異向性光擴散薄膜是具有 如前所述之特優的光學特性，且可具有經濟效益地製造， 但是在某種用途方面卻有無法符合除了光學特性以外等之 特性，例如耐熱性、耐熱尺寸穩定性、剛性等之機械特性 、或難燃性等之特性的情況。但是藉由積層透明塑膠薄片 與本發明之異向性光擴散薄膜，則可彌補除了光學特性以 外之特性而可滿足市場要求之綜合特性。 使用於本發明之透明塑膠薄片是只要其爲可滿足如上 所述之厚度與全光線透射率之特性時，則樹脂之種類或層 構成等是並無特殊限制》 -39- 201106021 使用於本發明之透明塑膠薄片之厚度更佳爲0.5至3 mm。若爲薄於0.1 mm時，則補強功效或彌補功效不足。 此外，若爲5 mm以上時，則有可能造成在經濟效益上爲 不利的情況、或損及柔軟性的情況。 使用於本發明之透明塑膠薄片之全光線透射率更佳爲 8 0至1 0 0 %，進一步更佳爲8 5至1 0 0 %。若爲低於7 0 %時， 則無法有效地利用如前所述異向性光擴散薄膜之特性。較 佳爲儘可能全光線透射率爲高且爲非擴散性者。此外，使 用具有擴散性者作爲該塑膠薄片以顯現積層功效之方法也 爲較佳。 使用於該塑膠薄片之樹脂較佳爲使用聚酯系樹脂、丙 烯酸系樹脂、苯乙烯系樹脂、環狀聚烯烴系樹脂、及聚碳 酸酯樹脂等之用作爲光學用途之樹脂，但是並不受限於此 等者。 如上所述異向性光擴散薄膜積層薄片之製造方法是並 無特殊限制。具體而言，其係包括將異向性光擴散薄膜與 塑膠薄片相貼合之方法。 在使用黏著劑或接著劑等來貼合之方法時，具體而言 ，「黏著劑」是包括：橡膠系黏著劑、丙烯酸系黏著劑、 聚矽氧系黏著劑、乙烯基系黏著劑等。由於本發明之異向 性光擴散薄膜積層薄片是有可能在高溫下使用，因此較佳 爲在常溫至120 °C下也爲穩定的黏著劑。其中，丙烯酸系 黏著劑是由於價廉而被廣泛地使用。無論使用何種黏著劑 ，其厚度較佳爲0.5至50μιη。 -40- 201106021 「接著劑」是包括藉由熱或觸媒之幫助而接著之接著 劑。具體而言，可使用聚矽氧系接著劑、聚胺基甲酸酯系 接著劑、聚酯系接著劑、環氧系接著劑、氰基丙烯酸酯系 接著劑、丙烯酸系接著劑等。由於本發明之異向性光擴散 薄膜積層薄片是有可能在高溫下使用，因此較佳爲在常溫 至120°C也爲穩定的接著劑。在此等之中，環氧系接著劑 是具有特優的強度、耐熱性，因此適合使用。氰基丙烯酸 酯系接著劑是具有特優的即效性與強度，因此可有效率地 利用於製造積層薄片。聚酯系接著劑是具有特優的強度、 加工性，因此特別適用於製造積層薄片。此等接著劑可由 接著方法大致劃分爲熱硬化型、熱熔型、二液混合型，但 是較佳爲使用可連續生產之熱硬化型或熱熔型。無論使用 何種接著劑，其厚度較佳爲0.5至50μιη。 將如上所述之塑膠薄片與異向性光擴散薄膜以接著劑 或黏著劑貼合之方法，若以使用積層機之捲進捲出或捲進 片出製程等進行貼合時，可獲得捲筒形狀或逐片形狀之製 品。例如使用接著劑時，則在塑膠薄片或異向性光擴散薄 膜中任一者上塗佈接著劑，經乾燥後使用輥與另一種材料 進行積層即可加以積層。 接著劑之塗佈方法是視基材或接著劑之種類而有許多 方法，最廣泛使用的是凹版輪轉塗佈機方式、缺角輪塗佈 機方式、及逆向塗佈機方式。在凹版輪轉塗佈機方式是將 部份浸漬於接著劑之凹版輪轉輥加以旋轉，並將經由背托 輥所輸送之薄膜接觸於附著接著劑之凹版輪轉輥來加以塗 -41 - 201106021 佈，塗佈量是可以控制輥之轉數、接著劑之黏度來加以調 整。逆向塗佈機方式是類似凹版輪轉塗佈機方式之方法， 但是附著於塗佈輥的接著劑之量則以與其相接所設置之計 量輥來加以調整。 在進行如上所述之貼合時，視需要也可加溫。此外， 爲獲得必要的接著強度，也可在經積層後實施熱處理。 在以黏著劑貼合的情況，則也可使用雙面黏著片。在 該方法的情況，雖然使用光學高透明型之黏著劑爲較佳的 實施模式，但是並無特殊限制。例如也可使用具有光擴散 性之黏著片。使用該黏著片時，也可在黏著層賦予光擴散 性。 在本發明中，也可以將如前所述異向性光擴散薄膜之 製造與如上所述異向性光擴散薄膜積層薄片之製造加以合 倂成一體化之方法來實施。 亦即，也可以例如在如前所述透明塑膠薄片表面上熔 融擠出用於構成如前所述異向性光擴散薄膜之熱塑性樹脂 摻合物以直接積層，亦即，所謂的擠出積層法來製造。此 外，也可在該熔融擠出積層法步驟內同時實施如前所述之 粗面化處理。 在以該擠出積層法實施的情況，爲提高異向性光擴散 薄膜與透明塑膠薄片之接著性或接著耐久性，則經導入增 黏塗佈處理、使用經加以易接著處理之透明塑膠薄片等之 措施是較佳的實施模式之一。 本發明之異向性光擴散薄膜或異向性光擴散薄膜積層 -42- 201106021 薄片，由於具有如前所述之特優的光學特性，較佳爲用作 爲使用LED光源的照明裝置之光擴散薄膜。然而並不受限 於此等者，例如用作爲使用螢光燈等之LED光源以外之光 源的照明裝置也是有效。例如在用作爲螢光燈光源之照明 裝置時，由於即使將螢光燈與光擴散薄膜或光擴散薄膜積 層薄片之距離靠近也可顯現高度的光擴散性，因此可顯現 照明裝置之厚度減少或螢光燈之支數減少等之功效。 此外，本發明之異向性光擴散薄膜或異向性光擴散薄 膜積層薄片，由於擴散性已比先前習知的光擴散薄膜獲得 大幅度的改善，在使用於以螢光燈作爲光源的LCD之輝度 提高用時，則可減少光擴散薄膜等之光學功能調整用薄膜 之片數。 (使用LED光源之點燈裝置） 在本發明中之另一發明是將如上所述之異向性光擴散 薄膜或如上所述之異向性光擴散薄膜積層薄片安裝於使用 LED光源之光照射裝置之出光部的外面或內面所獲得之使 用L E D光源之點燈裝置。 另外，所謂的「點燈裝置」是意謂用於明亮地照耀對 象物之照明裝置、用於直接視認經放射的光之發光裝置等 ，亦即，通常稱爲光、燈之裝置。 在發光裝置中，光擴散薄膜或其積層薄片之安裝方法 是也並無特殊限制。例如可以黏著劑或接著劑貼附於出光 部之外板的外面或內面、或單純的疊合安裝。在採用貼附 方式時，也可在全面使用黏著劑或接著劑加以固定、或使 -43- 201106021 用局部性方式加以固定。此外，在像螢光燈的管狀 裝置的情況，則可將光擴散薄膜或其積層薄片在其 內面以沿著該外管內側之形態插入安裝。 此外，也可無外板而僅安裝本發明之光擴散薄 積層薄片。 在本發明中，所謂的「照明裝置」是只要其爲 目的而具有用於明亮地照耀特定場所的功能之裝置 其種類或使用方法是並無特殊限制。例如其係包括 述之使用方法。 藉由本發明之異向性擴散薄膜可製成爲用於將 源之點狀光朝單一方向以直線狀照射均勻的光之照 。此種方式之照明裝置在由目視側斜方向照射之型 告牌或指向牌、博物館之陳列或店舗之商品展示、 通路或步道等除了必要部份以外不欲使光漏出的情 可用作爲在液晶顯示器或背光型的佈告板等之背光 出光部或邊光部份、影印機之光等各種照明裝置。 特別是在LED光源朝單一方向配置成長列狀的 置中，本發明之異向性擴散薄膜是可實現有效的使 。經設定薄膜之主擴散方向與LED之列成平行，藉 減少LED之數目，也可朝列方向照射直線狀且均勻 另外，即使LED之配列並非爲單一列而爲複數列時 其爲全體是呈配列成細長狀態者時即可。 並且，即使在設定成薄膜之主擴散方向與LED 正交時，則也可製成爲具有特徵的照明裝置。在此 之點燈 之外管 膜或其 以某些 時，則 如後所 LED光 明裝置 式的廣 桌燈、 況，則 單元的 照明裝 用方法 此即使 的光。 ，只要 之列成 情況下 • 44 - 201106021 ，即使LED光源爲朝單一方向配置成長列狀者時，則也可 將光朝與列成正交方向廣闊地加以擴散來照明。因此，可 利用作爲與室內之直管螢光燈相同之照明裝置，以均勻地 照明室內。此外，即使在天花板有新式樣性或裝飾時、或 有設備上限制等設置場所受限的情況，也可實現廣闊且均 勻的照明。 此外’可有效地用作爲信號機、各種機器之指示燈、 警告燈、航空機之進場燈、防波堤端部或浮標之位置標示 燈、埋設於通路等之行駛引導燈等、即使在水平方向或垂 .直方向之角度有所變化，但是卻需要明亮度變化爲少之發 光裝置。 (作爲背光裝置用之使用方法） 本發明之異向性光擴散薄膜或異向性光擴散薄膜積層 薄片’由於具有如前所述特優的光學特性，因此適合用作 爲背光裝置之輝度或照度提高用構件。 重要的是必須將如上所述本發明之異向性光擴散薄膜 或光擴散薄膜積層薄片設置在背光單元之出光面上來構成 。此時’異向性光擴散薄膜或異向性光擴散薄膜積層薄片 之設置方法是並無特殊限制。可單純地疊合設置，也可以 接著劑或黏著劑加以固定。此外，也可以雙面黏著膠帶加 以固定。 此外’也可設置在用於設置在背光裝置之上面的液晶 面板之最下面。 經採取該方式，即可有效地顯現如上所述本發明之功 -45- 201106021 效。 (背光單元） 用作爲使用本發明之異向性光擴散薄膜或異向性光擴 散薄膜積層薄片之背光單元，只要其爲至少在單面具有出 射光面之單元時，則其結構等是並不受任何限制。也可爲 邊光方式或直下方式。在邊光方式時之導光板的結構也不 受限制。 可使用於背光單元之反射薄膜或反射板之種類也不受 限制。可爲白色反射型、金屬反射型及其他型式之任一種 〇 可使用於背光單元之光源也不受限。例如可爲電燈炮 、發光二極體（LED)、電激發光面板（EL)、冷陰極管（CCFL) 及熱陰極管（HCFL)中任一者或組合此等者或其他之光源。 本發明之異向性光擴散薄膜或異向性光擴散薄膜積層 薄片，以使用一片之此等構件，也可賦予高輝度、輝度之 角度相依性減少、面內輝度均質性及圖案遮蔽性等之背光 裝置所應具備必要的光學特性，雖然重要的是以一片來使 用，但是也可兩片以上倂用，且也可與先前習知的透鏡薄 膜或光擴散薄膜等倂用。此外，也可倂用其他光擴散薄片 或光擴散板。在此情況下，也可倂用數種光學構件。較佳 爲視市場要求特性或經濟效益性等適當地選擇使用。 本發明之背光裝置是並不受限於用作爲顯示裝置用之 用途，也可用作爲如前所述照明裝置用之光源。 -46- 201106021 《實施例》 在下文中，以實施例更具體地說明本發明，但是本發 明並不受限於此等實施例者，當可在適合本發明之精神範 圍適當地加以變更實施，惟此等理應全部包含在本發明之 技術範圍內。另外，在實施例所採用的測定•評估方法如 下所述。此外，除非另有說明外，在實施例中所謂的「份 j是意謂「質量份」、且所謂的「％」是意謂「質量％」。 <全光線透射率、平行光線透射率及霧度> 使用日本電色工業股份有限公司（Nippon Denshoku Industries Co.，Ltd.)製造之霧度測定器（Haze meter)「 NDH-2000」，並根據JIS K 7136之準則進行測定。 該測定是使用經在試料固定部固定成光擴散薄膜之捲 繞方向成爲垂直方向來進行測定所獲得之測定値》此外， 若光擴散薄膜之表面粗糙度有差異存在時，則將表面粗糙 度之較粗者之面固定於受光側來進行測定。例如，在僅在 單面施加粗面化處理之光擴散薄膜的情況，則以實際使用 時光會通過的方向加以固定來進行測定。 <透射光之擴散度比之測定方法> 使用自動變角光度計（GP-2 00、村上色彩技術硏究所股 份有限公司製造）來進行測定》 以透射測定模式、光線入射角：0。（對於試料面成上下 、左右皆爲直角之角度）、受光角度：一90。至90。（赤道線 面上之角度）、濾光片：使用 ND10、光束光圈：10.5 mm(VS-l 3.0)、受光光圈：9.1 mm(VS-3 4.0)及變角間隔爲 -47- 201106021 〇·1度之條件進行測定，並變更 SENSITIVITY或 HIGH VO LTON之設定使得透射光之波峰頂成爲圖之40至90 %來 測定。藉此，可測得透射光之變角光度曲線之波峰高度的 一半高度之角度的寬度（半値寬度）。 將異向性光擴散薄膜之捲繞方向固定於垂直方向及水 平方向來進行如上所述測定，並假設該半値寬度較大者爲 DH1，較小者貝IJ爲DL1，以計算出擴散度比1(DH1/DL1)。 此外，假設波峰上升角度與波峰結束角度之間的角度之度 數較大者爲DH2，較小者則爲DL2，以計算出擴散度比 2(DH2/DL2)(參閱第1圖）。該波峰上升及結束角度是以10 倍之放大鏡觀察該部份，並以該波峰之線會消失的最前端 處之角度視爲各自之角度。藉此，即可下明確的判斷。 若光擴散薄膜之表面粗糙度有差異存在時，則如上所 述測定是以實際使用時光會通過的方向加以固定來進行測 定。 另外，將移動受光器之面定義爲「赤道面」。 <光之反曲度> 使用自動變角光度計（GP-200、村上色彩技術硏究所股 份有限公司製造）來進行測定。201106021 VI. Description of the Invention: [Technical Field] The present invention relates to an anisotropic light diffusion film (aniS〇UQpie light-diffusing film), a laminated sheet thereof, and a method of manufacturing the same. More specifically, the present invention relates to a so-called "transmittance" and "diffusing power" which are excellent in light, and which can be diffused by light-foe using in a specific direction. Anisotropic light-diffusing film of anisotropic light-diffusing film's laminated sheet and its manufacturing method [Prior Art] In recent years, LED (Light Emitting Diode) has characteristics of low energy consumption and long life. It has been attracting attention from the viewpoint of energy conservation, and has been widely used as a light source for illumination such as indoor lighting, interior lighting, exterior lighting, advertising lamps, and display devices. However, since the light emitted by the LED light source is highly straightforward (directivity), efficient illumination can be achieved for a narrow range of dots, but the diffusibility of light is insufficient. Therefore, in order to use a large number of light sources to achieve a wide area of illumination, it is necessary to adopt an illumination mode in which each light source is arranged in a dot shape, and if uniform brightness is to be obtained, it is necessary to increase the number of light sources and configure them in a dense state. . For example, in the case of illumination of a display, in the case of performing illumination in an edge-light manner, if a uniform luminance is to be obtained, the number of LED light sources must be increased, so that the energy-saving feature can not be effectively utilized. In this case, 'if an anisotropic light-diffusing film that diffuses light in a specific direction is disposed in the light-emitting portion of the light source so that the light diffusion direction can be diffused toward the long axis of the edge light 201106021, then The point-like light can be made to diffuse the light toward the long axis of the edge light', thus greatly reducing the number of LED light sources. In addition, LED lighting is also used as a light source for advertising media or lighting. In view of this use, a film having anisotropic light diffusibility which improves decorative or decorative illuminance is desired. If you want to obtain a uniform light distribution over a wide area, you need to take all necessary measures. For example, a method for solving luminance unevenness by the following configuration has been previously disclosed. The structure is provided with at least one primary light source, and a light-emitting end face for guiding light from the primary light source and having a light incident end face for incident light from the primary light source and for guiding a plate-shaped light guide body of a "light exit surface" of light light, wherein the light guide body has a light-emitting structure on both of the light-emitting surface and a back surface on the opposite side thereof, and the light-emitting surface and the light-emitting surface The two or one of the back sides have at least one partial lens array forming portion, each of the partial lens column forming portions each including at least one partial lens array, and the partial lens array is formed and emitted by the primary light source Among the light incident on the light incident end surface, the direction of the peak light of the luminance distribution at the incident position of the maximum intensity light is different (see Patent Document 1). Further, a lampshade having a light source accommodating portion having an opening portion at one end and a light reflecting surface at an inner side thereof, a light emitting diode provided in the light source accommodating portion, and a front surface provided in the opening portion are also disclosed. The display panel is a technique for diffusing and reflecting light from a light-emitting diode to homogenize (see Patent Document 2). 201106021 Also, a surface illumination source is provided, which is provided with: a light source for emitting light; an optical transparent light guide for propagating light from the light source and having a radiation surface at a predetermined position in a radial direction thereof; a coverless cover for closing a surface other than the radiation surface of the light guide; all of the inner reflection means disposed between the cover and the light guide: and the radiation surface for reflecting at a predetermined ratio A radiation side reflection device for light from the light source (see Patent Document 3). The method disclosed in Patent Documents 1 to 3 as described above is a technical problem in which the structure of the light source is complicated and the economic efficiency is poor. Further, although it is possible to correspond to planar illumination, it is difficult to cope with the technical problem of using a tubular illumination body such as a fluorescent lamp. On the other hand, various anisotropic light-diffusing films have been disclosed in order to improve the luminance uniformity of, for example, a display using a cold cathode tube as a light source. For example, a method of uniaxially extending a polyester resin has been disclosed (see Patent Document 4: Japanese Laid-Open Patent Publication No. 2000-47009), and a non-compatible thermoplastic resin is melt-extruded. The film method (see, for example, Patent Document 5), and a method of applying a embossing process or the like to the surface of the film to control the surface shape (see Invention Patent 6, etc.) and the like. However, the conventionally known anisotropic light-diffusing film, when used as a lighting device using an LED light source, has not reached a level that can sufficiently satisfy the market demand due to insufficient diffusibility. In particular, since the LED light source is highly directional, the light source of the light source does not disappear, and the amount of light around the light source is increased (hereinafter, sometimes referred to as "light spot disappears 201106021 sex"). Therefore, if the technical problem is to be suppressed, the technical problem of reducing the amount of light (hereinafter, sometimes referred to as "total amount of light") of the entire illumination device will be caused. The anisotropic light-diffusing film obtained by the conventionally known method can only satisfy any of the above-described characteristics, and thus fails to satisfy the market requirement. For example, in the method disclosed in Patent Document 4, It is preferable to disclose the diffusion transmittance to 20 to 70%. Further, the method disclosed in Patent Document 5 has a low haze, and thus it is expected that the light spot disappearability is poor. On the other hand, liquid crystal display devices (LCDs) are effectively utilized for their thinness, light weight, low power consumption, etc., and are mostly used as flat panel displays, and their use is in portable phones and portable devices. The personal digital assistant (PDA: Personal Digital Assistant), personal computer, television, and other information display devices are expanding year by year. The liquid crystal display device suppresses the loss in the light propagation path from the light source to the panel, and improves the brightness of the panel. A backlight unit is disposed on the lower side of the layer. Among them, a person who emits light by a back-illuminated liquid crystal layer has been widely used and widely used, and is roughly classified into a side type and a direct type depending on the arrangement of the light source. In recent years, the backlight unit has been widely used not only in liquid crystal display devices but also in fields such as lamps or decorative lighting billboards. The backlight unit is an optical member such as a combination of a backlight, a lens film, a light-diffusing film, and a brightness-enhancing film, and the like, and is desired to increase the brightness of the panel or improve the uniformity of the luminance. Usually, two to four 201106021 pieces are used (see, for example, Non-Invention Patent Document 1, etc.). For example, a method for increasing the luminance of a lens film has been disclosed (see, for example, Patent Document 6). In this method, since the luminance is improved by the light collecting effect of the lens, the luminance when viewed from the front can be improved, but the luminance when viewed from the oblique direction is greatly reduced as compared with the luminance when viewed from the front. In addition, the price is also expensive. As a method for solving the technical problem that the luminance when viewed from the oblique direction is greatly reduced as compared with when viewed from the front, a technique of using two light diffusion films in addition to the lens film has been disclosed ( See, for example, Patent Document 7). Further, since only one sheet of the lens film as described above is used, the luminance uniformity is insufficient, and therefore a technique of combining the lens film and the anisotropic light-diffusing film has been disclosed (see Patent Document 8). Further, although a method of further improving the film by the use of the luminance in the lens film as described above has been described (see, for example, Patent Document No. 9, etc.), the effect of reducing the angle dependency of luminance is not remarkable. In recent years, it has evolved to exhibit high luminance due to improved performance of backlight devices, and in the use of large-scale TV or satellite navigation systems, it is more strongly required to improve the angle dependence of luminance than the luminance of frontal luminance. In addition, it has been strongly demanded to reduce the loss or cost and the thinning of the device by reducing the number of members and the like. Therefore, attempts have been made to impart light diffusibility to the single-substrate film itself (see, for example, Patent Document 1). 201106021 However, the film disclosed in Patent Document 12 has a small degree of diffusion, which means that in-plane luminance homogeneity or pattern concealing property is insufficient (Prior Art Document) (Invention Patent Document) (Invention Japanese Patent Laid-Open Publication No. 2002-343 No. 1-24 (Invention Patent Document 2) Japanese Laid-Open Patent Publication No. 2003-1 86427 (Invention Patent Document 3) Japanese Patent Application Laid-Open No. 2008-027886 Japanese Laid-Open Patent Publication No. 2000-47009 (Invention Patent Document 5) Japanese Laid-Open Patent Publication No. 2003-90906 (Invention Patent Document 6) Japanese Invention Patent Laid-Open No. 2004- Japanese Laid-Open Patent Publication No. 2008-256797 (Invention Patent Document 8) Japanese Patent Laid-Open No. 2006-25 13 95 (Invention Patent Document 9) Japanese Invention Patent Special Table Japanese Laid-Open Patent Publication No. 2007-10798 (Non-invention Patent Document) (Non-invention Patent Document 1) Uchida Ryudan University, "Illustrated Electronic Display Encyclopedia" ( Journal of the Kogyo Chosakai Publishing, Inc., pp. 47-48. SUMMARY OF THE INVENTION [Technical Problem to be Solved] An object of the present invention is to provide a superior light transmittance and diffusivity and to collect light in order to solve the problems of the prior art as described above. The so-called anisotropic light diffusing function which is diffused in a specific direction is a 201106021 directional light diffusing film, a laminated sheet thereof, and a method for producing the same. [Technical method for solving the problem] The present invention has been made in view of the above-described situation, and finally solves the technical problem as described above. The inventors of the present invention can achieve uniform illumination over a wide range and have a high degree of diffusibility in suppressing a reduction in the total amount of light from a high-light direct-light source such as an LED light source, and can diffuse light to a specific range. Various illuminating devices of the so-called anisotropic light diffusing direction, in particular, an anisotropic light diffusing film suitable for use in an illuminating device having a high linear light source such as an LED, and when used in a backlight device The present invention has finally been achieved by using a conventionally known light-diffusing film or a lens film or the like to concentrate on the anisotropic light-diffusing film which is superior in brightness characteristics and the number of sheets used. The so-called anisotropic light-diffusing film, the laminated sheet thereof, and the method for producing the same include the following constitutions. An anisotropic light-diffusing film characterized by a mixture of at least two incompatible thermoplastic resins and at the same time conforming to the following characteristics (1) to (4): (1) total light Transmittance is 66% or more; (2) Haze is more than 80%; (3) Parallel light transmittance is less than 20%; (4) Measured by the method described in this specification, and used The variable angle photometer measures the diffusivity of the transmitted light as the intensity of the incident angle as 1 (DH1/DL1) or the diffusivity ratio 2 (DH2/DL2) of any of the -10-201106021 - which is more than 2.0; 'DH1 and DL1 are measured by an automatic variable angle photometer, and the winding direction of the anisotropic light-diffusing film is fixed in the vertical direction and the horizontal direction, and the peak height of the variable angle luminosity curve of the transmitted light is obtained. In the width of the half height angle (half width), it is assumed that the larger half width is DH1, and the smaller one is DL1; in addition, DH2 and DL2 are measured by an automatic variable angle photometer and anisotropic light The winding direction of the diffusion film is fixed in the vertical direction and the horizontal direction for measurement. In the degree of the angle between the angle and the peak end angle of the dioptric luminosity curve of the light, it is assumed that the degree of the angle is larger than DH2, and the smaller of the angle is DL2. 2_ The anisotropic light-diffusing film of item 1, wherein DH2 is 110 degrees or more. 3. The anisotropic light-diffusing film of item 1 or 2 as described above, wherein the description is as disclosed in the present specification. In the method, the winding direction of the light-diffusing film is fixed in the upper direction and the parallel direction and the horizontal direction of the sample fixing table, and the degree of curvature of the light obtained in the main diffusion direction is 4 to 100% ° 4. The anisotropic light-diffusing film according to any one of the items 1 to 3 above, wherein at least one of the mixture of at least two kinds of incompatible thermoplastic resins as described above is composed of a polyolefin-based resin. 5. The anisotropic light-diffusing film of item 4, wherein the mixture of at least two incompatible thermoplastic resins as described above is made of two kinds of polyolefin-based resins of -11-201106021 Composition. 6. The anisotropic light-diffusing film of item 5, wherein the main component of the mixture of at least two incompatible thermoplastic resins is a blending ratio of the cyclic polyolefin resin to the polyethylene resin of 10 a mixture of /90 to 90/10. - 7. The anisotropic light-diffusing film of item 5 or 6 as described above, which is on at least one side of a light-diffusing film composed of a mixture of at least two kinds of incompatible thermoplastic resins as described above, The laminate is mainly a surface layer composed of a polyolefin resin. 8. The light-diffusing film of item 7, wherein the polyolefin-based resin for forming the surface layer as described above is composed of a polyolefin resin containing a polar group. 9. The anisotropic light-diffusing film of item 8, wherein the polyolefin resin having a polar group is at least a carboxyl group. 10. The anisotropic light-diffusing film according to any one of items 1 to 4 above, wherein the other thermoplastic resin as described above is composed of a fluorine-based resin. The anisotropic light-diffusing film according to any one of items 1 to 4, wherein the other thermoplastic resin as described above is composed of a polyester resin. 12. The anisotropic light-diffusing film of item 11 as described above, which is formed by extending more than twice in one direction. 13. An anisotropic light-diffusing film laminate sheet characterized by a light-diffusing film according to any one of items 1 to 12 above, having a thickness of from 0.1 to -12 to 201106021 5 mm, total light transmittance The invention relates to an anisotropic light-diffusing film according to any one of the items 1 to 12, which is used for a lighting device equipped with an LED light source. 15. The anisotropic light-diffusing film laminate sheet of item 13 as described above, which is used in a lighting device equipped with an LED light source. 16. A lighting device using an LED light source, characterized in that the anisotropic light-diffusing film according to any one of items 1 to 12 above is mounted outside the light-emitting portion of the illumination device using the LED light source or inside. A lighting device using an LED light source, characterized in that the anisotropic light-diffusing film laminated sheet according to item 13 is attached to an outer surface or an inner surface of a light-emitting portion of an illumination device using an LED light source. A backlight device characterized in that the anisotropic light-diffusing film according to any one of items 1 to 12 is provided on an exit surface of the backlight unit. A backlight device characterized in that the anisotropic light-diffusing film laminated sheet of the thirteenth aspect is provided on an exit surface of the backlight unit. 20. A method of producing an anisotropic light-diffusing film for use in the manufacture of an anisotropic light-diffusing film according to any one of items 1 to 12 above, characterized in that at least two incompatible thermoplastics are used The mixture of resins is melt extruded. 21. The method of producing an anisotropic light-diffusing film according to item 20, wherein the molten resin is extruded from a die into a sheet shape by an extruder, and the sheet is pressed by a gas pressure and/or Or the attraction method and / or static 13-201106021 The adhesion method is adhered to the film and cooled and solidified to form a film. [Effects of the Invention] The anisotropic light-diffusing film of the present invention and its laminated sheet have a so-called anisotropic light-diffusing function which is excellent in transmittance and diffusivity of light and which can concentrate light to be specifically diffused. It is possible to convert the point light of the direct linearity of the LED into linear light. Therefore, even in the case of illumination of, for example, even if the number of LED light sources is reduced, uniformity can be achieved. Further, in the case of using as a light source of an advertising medium or illumination, it is characterized in that decorative or decorative lighting can be improved. Further, since the transmittance of the straight-through light is small, when it is used as an illumination device for light source, the degree of reduction of the light transmittance can be suppressed after the point where the strong light is not observed, and thus the difference can be made. Directional light diffusivity. Further, the hetero-diffused film laminated sheet for an illumination device using an LED light source of the present invention can improve non-optical characteristics such as heat resistance or strength while maintaining the optical characteristics as described above. Further, the anisotropic light-diffusing film of the present invention has a heterodiffusion function and has a diffusibility higher than that of the conventionally known anisotropic light-diffusing film, and the diffusion film having a display as a light guide plate has a luminance improving effect. Characteristics. Therefore, it can be effectively used for illumination of indoors, illumination of an interior-mounted panel, light irradiation of a photocopier, or display illumination such as a liquid crystal display. In the case where there is a direction and the source is strong, the line needs to be uniform, and the LED light source is used to give uniform light, and when the directional light is high, the lighting device is used. -201106021 In addition, the difference of the present invention When a directional light-diffusing film and a laminated sheet using the same are used as an optical member of a backlight device, high-intensity, high-intensity angle dependency reduction, in-plane luminance uniformity, and pattern shielding property can be imparted by using one sheet. The optical member used as the backlight device should have necessary optical characteristics, so that the economic efficiency of the backlight device can be improved. In particular, it is not necessary to use a lens film which is expensive, and it is possible to provide a great advantage in solving the technical problem that the luminance is lowered when viewed from an oblique direction, for example, when the lens film is used. Further, the backlight device of the present invention has a high front luminance which is close to a backlight device using a lens film, and can reduce the angle dependence of luminance which constitutes a technical problem of a backlight device using a lens film, and thus, when used in, for example, a large TV, It has the advantage of suppressing a decrease in brightness of a picture when viewed from an oblique direction. Moreover, due to this feature, it can be used, for example, in a satellite navigation system to view a backlight of a display having a greater chance of viewing from an oblique direction. Further, when it is used as a backlight device for indoor or in-house lighting fixtures, there is an advantage that a wider range of uniform illumination can be obtained than in the case of a backlight device using a lens film. Further, the backlight device of the present invention has the advantage of being able to impart all of the above characteristics by using a member of one sheet, and thus has a remarkable high economic efficiency. Therefore, the backlight device of the present invention can be effectively used for a liquid crystal display device, an indoor illumination, an interior illumination decorative illumination panel, or the like. Further, the manufacturing method of the anisotropic light-diffusing film according to the present invention, 15-201106021, can economically and stably produce the anisotropic light-diffusing film of the present invention having the above characteristics. [Embodiment] [Best Mode for Carrying Out the Invention] (Optical Characteristics) The anisotropic light-diffusing film of the present invention (hereinafter sometimes referred to as "light-diffusing film") is characterized. It is composed of a mixture of at least two incompatible thermoplastic resins, and at the same time can meet the following characteristics of items (1) to (4): (1) The total light transmittance is 6 6 % or more: (2) Fog The degree is more than 80%; (3) The parallel light transmittance is less than 20%. (4) Measured by the method disclosed in this specification, and the diffuseness ratio of transmitted light measured by the angle of incidence is measured by a variable angle photometer (DH1/DL1) or diffusivity ratio 2 (DH2/ Any of DL2) is more than 2.0. (Where, DH1 and DL1 are measured by an automatic variable angle photometer, and the winding direction of the light-diffusing film is fixed in the vertical direction and the horizontal direction, and the peak height of the variable-angle luminosity curve of the transmitted light obtained is half. In the width of the height angle (half width), it is assumed that the width of the half turn is DH1, and the smaller one is DL1; in addition, DH2 and DL2 are measured by an automatic variable angle photometer and the roll of the light diffusing film The measurement is performed by fixing the direction in the vertical direction and the horizontal direction, and the degree of the angle between the peak angle of the angle of change of the transmitted light and the peak end angle of the obtained light is assumed to be larger than the angle of the angle of the -16-201106021 angle. For DH2, the smaller the degree of the angle is DL2 〇> 〇 In the following, 'the direction of DH is sometimes referred to as the main diffusion direction j 0. The total light transmittance is preferably 68% or more as described above. More preferably, it is 70% or more, and particularly preferably 80% or more. In addition, in principle, it is impossible to exceed 100%, so 100% is the upper limit. Since the total light transmittance is higher, it is better. Good for 90% Above, the best is 100%, but there is a possibility of loss due to reflection at the interface, etc., so that the actual upper limit is limited to 98% or even 95%. If the loss is large, it may be limited to about 93. In the case of %, if the light transmittance is less than 66%, the transmittance of light emitted by, for example, the LED light source is lowered, so that the amount of light used for illumination is lowered, resulting in a decrease in illuminance or luminance of the illumination device. The parallel light transmittance is preferably 1% or less, more preferably 5% or less, still more preferably 2% or less as described above. Further, in principle, it is impossible to be less than 0%, so 0% If it is more than 20%, if the parallel light transmittance exceeds 20%, for example, the disappearance of the spot of the LED light source will be deteriorated, resulting in a strong light amount due to the light spot of the strong light source, making it impossible to obtain homogeneous illumination. In the present invention, the haze of the film is preferably more than 80%», the haze is preferably 90% or more, more preferably 95% or more, still more preferably 97% or more. In principle, it is impossible to exceed 1〇〇%, because 1 0 0 % is the upper limit. -17- 201106021 If the haze is less than 80%, then the diffusibility of light will be reduced, so that it is not possible to achieve a broad range of uniform illumination, which is not good. When a broad range of uniform illumination is achieved, the number of LED light sources must be increased, so that it will become uneconomical in terms of economic efficiency. In addition, the distance between the light source and the anisotropic light-diffusing film must also be increased, so that the illumination device The thinning of the light is limited. In the present invention, it is preferable that any of the diffused light transmittance ratio 1 (DH1/DL1) or the diffusivity ratio 2 (DH2/DL2) measured by the method described below is used. The value is more than 2.0 (wherein DH1 and DL2 are measured by an automatic variable angle photometer, and the winding direction of the light-diffusing film is fixed in the vertical direction and the horizontal direction, and the variable angle luminosity curve of the transmitted light is obtained. In the width of the half height of the peak height (half width), it is assumed that the larger half width is DH1, and the smaller one is DL1; in addition, DH2 and DL2 are measured by an automatic variable angle photometer and will be different Roll of directional light diffusing film The measurement is performed by fixing the direction in the vertical direction and the horizontal direction, and the degree of the angle between the peak angle of the angle of change of the transmitted light and the peak angle of the peak is assumed to be DH2. The smaller the degree of angle is DL2. ). In the present invention, as long as the diffusion ratio is greater than or equal to 2.0 in either of 1 or 2, if both of them exceed 2.0, the degree of anisotropy can be further improved, and thus Preferably. That is, in the present invention, the term "diffusion ratio 1 or diffusion ratio 2 (DH2/DL2) is more than 2.0" means that at least one of the diffusion ratios 1 or 2 is more than 2 The state of 〇 is the state in which both of them are more than 2.0. The preferred state is 18-201106021 The diffusion ratio 1 (DH1/DL1) and the diffusion ratio 2 (DH2/DL2) are as described above. All are indicators of the anisotropy of light. Representing the degree of anisotropy of light diffusion, a diffusion ratio of 1 has been used previously. However, even when the diffusion ratio is less than 2·0, there is an anisotropic film which exhibits strong light diffusion. Therefore, it is found that the diffusion ratio is 2 by focusing on the light diffusion characteristics of the film. The degree of anisotropy that represents the diffusion film is also important. In other words, when solving technical problems, it is not only a range in which the amount of light of a half-turn width is relatively large, but also how many angles the light will diffuse in a portion where the amount of light is low. The diffusing degree is preferably as described above, and the diffusivity ratio is either 2.5 or more, more preferably 3.0 or more. When the degree of diffusion ratio is 2.0 or less, the anisotropy of light diffusion is lowered, and the degree of light collection in a specific direction is lowered to lower the light diffusion anisotropy, which is not preferable. The upper limit is not particularly limited, but a preferred range for practical use is also about 20, more preferably about 15, for either of the diffusivity ratios 1, 2. Since this characteristic is obtained, the degree of diffusion in a specific direction can be controlled, so that the diffusion effect of light which cannot be achieved by the isotropic diffusion film can be imparted. For example, in an illumination device in which an LED light source is arranged in a line, when the main diffusion direction of the anisotropic light-diffusing film is arranged to be orthogonal to the direction in which the LED light sources are arranged, the original dot shape can be used. The light of the LED light source is converted into a uniform light band that is linear in the direction in which the LED light sources are arranged. On the other hand, if the main diffusion direction is arranged in a direction parallel to the arrangement direction of the LED light sources to use the film, the light of the original dot-shaped LED light source -19-201106021 can be concentrated only on the LED light source. The arrangement direction is orthogonal to the direction of diffusion. Further, since the parallel light transmittance, haze, and diffusivity are set to a moderate range, the visibility of the light source of the LED light source is lowered, and the visibility of the LED light source is also suppressed. Further, when used in a backlight device, it is also possible to increase the luminance increase range by further improving the light collecting property than the isotropic light-diffusing film. Further, the diffusion ratio as described above is determined by the method described below. <Measurement Method of Diffusion Ratio of Transmitted Light> The measurement was carried out using an automatic variable angle photometer (GP-200, manufactured by Murakami Color Research Laboratory Co., Ltd.). In the transmission measurement mode, the incident angle of light is 0° (the angle is a right angle for the upper and lower sides of the sample surface), the angle of acceptance: 90° to 90° (the angle on the equatorial plane), and the filter: ND10 is used. , beam diaphragm (diaphragm): 10.5 mm (VS-l 3.0), light-receiving aperture: 9.1 mm (VS-3 4.0) and variable angular spacing of 0.1 degrees, and change the SENSITIVITY or HIGH VOLT ON settings to make transmission The peak of the light wave is measured as 40 to 90% of the graph. Thereby, the width (half width) of the half height of the peak height of the variable angle luminosity curve of the transmitted light can be measured. The measurement as described above is performed by fixing the winding direction of the anisotropic light-diffusing film in the vertical direction and the horizontal direction, and calculating the obtained half-turn width is assumed to be DH1 and the smaller one is DL1. The diffusion degree is -20-201106021 than 1 (D HI/DL1). Further, the degree of the angle between the peak rising angle and the peak end angle is assumed to be DH2, and the smaller one is DL2 to calculate the diffusivity ratio 2 (DH2/DL2) (see Fig. 1). The peak rise and end angles are observed with a magnifying glass of 10 times, and the angle at the foremost end where the line of the peak disappears is regarded as the respective angle. In this way, you can make a clear judgment. When there is a difference in the surface roughness of the light-diffusing film, the measurement as described above is measured by fixing the direction in which the light is actually used. In addition, the surface of the moving photoreceiver is defined as "equatorial plane". Further, in the anisotropic light-diffusing film of the present invention, DH2 is preferably at least 110 degrees, more preferably at least 120 degrees, as described above. If DH2 is less than 110 degrees, the light diffusibility in this direction will be lowered, making it difficult to obtain homogeneous illumination over a wide range, which is not preferable. If it is desired to achieve homogeneous illumination over a wide range, for example, the number of LED light sources must be increased', which would be economically disadvantageous. In addition, the distance between the light source and the anisotropic light-diffusing film must also be increased, so that the thinning of the illumination device is limited. In the present invention, if the anisotropic light-diffusing film having the above characteristics is used as a backlight device and the effect of the present invention is effectively exhibited, the degree of refraction of light measured by the method described below is used. It is preferably from 4 to 100%. (Refraction of light) The degree of recursion of light in the present invention is obtained by the following method -21-201106021 <Measurement method of the degree of refraction of light> The measurement was carried out using an automatic variable angle photometer (GP-200, manufactured by Murakami Color Technology Research Institute Co., Ltd.). In the transmission measurement mode, the incident angle of light: 0. (The angle of the sample is up and down, the right and left angles are right angles), and the angle of acceptance: 90. To 90. (angle on the equator line), filter: use ND10, beam aperture: 10. 5 mm (VS-l 3. 0), received by light: 9. 1 mm (VS-3 4. 0) and the variable angle interval is 〇. The measurement was carried out under conditions of 1 degree, and the setting of SENSITIVITY or HIGH VO LTON was changed so that the peak of the transmitted light became 40 to 90% of the figure. The variable angle luminosity curve of the obtained transmitted light was measured at a height (H0) of an angle of 0 degrees. It was measured that the incident angle of the light was changed to 6 除了. Except for the angle (the angle on the equatorial plane), the angle of change of the transmitted light when measured under the same conditions as described above is at a height of 0 degrees (H 60). The H60 and H0 measured by this method are used, and the degree of recursion is calculated by the following equation (refer to Fig. 2). The degree of refraction of light = Η 60 / Η〇χ 1 00 (%) (1) In addition, the plane defining the moving photoreceiver is the equatorial plane. The degree of refraction of the light is obtained by measuring in the main diffusion direction. If there is a difference in surface roughness of the light-diffusing film, the light is fixed in the same direction as that actually used in the backlight device. The degree of curvature of light as described above is preferably 6% or more, more preferably 8% or more. The upper limit of the degree of recursion is preferably 100%, but in practice, it is 80% or less, further 70% or even 60% or less, and depending on the situation, -22-201106021 may become 55% or less. Case. When the degree of refraction of light is less than 4%, it is necessary to provide an optical member for a high-intensity and luminance angle-dependent dimming device when only one film is used as an optical member for a backlight device. The optics are not good at all. It is meant that the increase in luminance is related to the fact that the light source can be incident on the light-diffusing film in an oblique direction. The state of scattering in the backlight is adjusted in the range of the backlight as described above. The degree is obtained by representing, for example, the degree to which the light is incident on the reflex effect of the anisotropic light spread in the film, that is, the scale at which the light exits the front side. From a certain meaning is considered a scale used to represent the efficacy of collecting light. The present invention is effective over previously known light diffusing films or lens films. Therefore, the above-described work of the present invention can be effectively exhibited. For example, when the backlight device for an anisotropic light-diffusing film device of the present invention is used, even if only one sheet is used, the degree of dependency can be reduced and the in-plane luminance uniformity can be improved. Or improve the various features. Previously, a lens film and a light diffusing film (thin J) were used, and when only one piece was used for each member, only one of the characteristics was always used. Therefore, the use of a thin anisotropic light diffusion may cause The case of less waiting as a backing is different depending on how much the backlight is in the front direction*. When the film is optimally polarized, the light angle of the light diffusing film can also be greatly reversed. It is used as a liquid crystal to show the brightness of the corner pattern, etc. V) and the light diffusing plate conforms to the above-mentioned film, and can also impart the ideal characteristics of all the characteristics, such as • 23-201106021, which is the anisotropic light of the present invention. The first of the diffusion films. The reason why the ideal characteristic can be imparted is not clear, but it can be presumed that it can be achieved by simultaneously satisfying the optical characteristics of the above-mentioned items. For example, the fact that the degree of recursion of light is high is the angle dependence of luminance, and the degree of diffusion is high, which contributes to the contribution of in-plane luminance homogeneity or pattern shielding. (Configuration of anisotropic light-diffusing film) The anisotropic light-diffusing film of the present invention is preferably composed of a mixture of at least two incompatible thermoplastic resins. The existence form of the mixture of at least two kinds of incompatible thermoplastic resins as described above is not particularly limited as long as it satisfies the optical characteristics as described above. The so-called "sea/island structure" in which the respective resins are used as the continuous phase and the dispersed phase, or the structure in which the two resins form a "co-continuous phase" can be used. Due to the refraction or scattering of light at the interface of the two resins, the characteristics as described above can be imparted. (A mixture of at least two incompatible thermoplastic resins) The "thermoplastic resin" used in the present invention for a mixture of at least two incompatible (immiscible) thermoplastic resins is, for example, a polyethylene resin. Polyolefin resin, polybutylene resin, cyclic polyolefin resin, and polyolefin resin such as polymethylpentene resin, polyester resin, acrylic resin, polystyrene resin, and polycarbonate The ester resin, the fluorine resin, and the like, etc., may be selected from at least two of the thermoplastic resins, but one of the two -24 to 201106021 resins is preferably a polyolefin resin or a polyester. Resin, fluorine resin, etc. It can be appropriately selected depending on optical characteristics, other required characteristics, or economic efficiency. The blending ratio of at least two incompatible thermoplastic resins as described above is preferably from 10/90 to 90/10, more preferably from 20/80 to 80/20, still more preferably in a weight ratio of each. The ratio of 3 0/70 to 70/30 is greatly changed depending on the kind of the resin component, the layer constitution as will be described later, the thickness of the light diffusion layer, and the production method. In other words, is it due to the decrease in the number of interfaces of the two incompatible thermoplastic resins, the more the weight ratio leaves 5 0/5 0, the more the total light transmittance decreases, the haze decreases, and the parallel light transmittance increases. Propensity. Further, if the melt flow rate of the island component is low, there is a possibility that it is difficult to apply a force which makes the island component thinner by shearing or drafting in the die, resulting in a decrease in anisotropy. The tendency is that the weight ratio becomes stronger as it leaves 50/50. The characteristics can be adjusted while considering these tendencies. Further, when the blending ratio of the two incompatible thermoplastic resins is plural, there is a tendency to become a continuous phase. In particular, when the melt flow rates are close, it is also necessary to consider that the composition of the island structure may be reversed due to the ratio. As described above, the resin can be selected from generally available high-purpose general-purpose resins, but it is also possible to use a special product for more stable production and the like. From the viewpoint of easily achieving the optical characteristics as described above and having excellent mechanical properties or thermal properties other than optical properties, the polyester resin is preferably polyethylene terephthalate or polypair. Phthalate phthalate-25- 201106021 A homopolymer and/or a copolymer of a glycol ester, a polyethylene naphthalate, and a polybutylene naphthalate. In addition, it is also advantageous in terms of economic efficiency. The resin which can be combined with the polyester is preferably a polyolefin resin as described later. Further, the fluorine-based resin is also not included as long as it satisfies the above characteristics. Although it is particularly limited, it is preferable to use a fluorine-containing monomer such as a vinylidene fluoride resin or a perfluoroethylene, and ethylene or propylene, based on the reason that it is easy to achieve the optical characteristics as described above and is advantageous in terms of economic efficiency. A copolymer of an olefinic monomer. The fluororesin has excellent light resistance. For example, when combined with a polyolefin resin, an anisotropic light-diffusing film having excellent light resistance can be obtained. The resin which can be combined with a fluorine-based resin is preferably as follows. The polyolefin resin described above. From the viewpoint of stably exhibiting the characteristics as described above, in particular, it is possible to satisfy, for example, the viewpoint of the total light transmittance and the self-contradictory phenomenon in which the haze, the parallel light transmittance, and the diffusivity ratio coexist. Preferably, at least one of them is composed of a polyolefin resin. The polyolefin resin includes polyethylene, polypropylene, polybutene, polypentene, polyhexene, polymethylpentene, or the like, a copolymer thereof, a cyclic polyolefin, and the like. From the viewpoint of light resistance or economic efficiency, it is preferred to use a polyhydrocarbon-based resin for both of them. In the case where the polyolefin resin is used in both cases, the combination is not particularly limited, but it is preferable to set the refractive index difference between the two polyolefin resins to be 0. 003 to 0. The range of 07 is better at 0. 005 to 0. The scope of 05 is further better for 〇. 〇1 to 〇. 〇2 range. When the refractive index difference is set to be in this range, the light-diffusing film of the optical characteristics as described above can be obtained more stably. For example, the difference in refractive index is more than 〇. 〇7°' is advantageous for controlling the haze or parallel light transmittance to the range as described above but it is not easy to maintain the balance of the total light transmittance. On the other hand, if it is less than 0. At 003, although it is easy to achieve total light transmittance, it is difficult to maintain a balance with haze or parallel light transmittance. If the refractive index difference is larger, the angle between the two non-compatible thermoplastic resins changes more, so although it is favorable for diffusion, on the other hand, the reflection at the interface will be in exponential function mode. The reason for the increase in land. Therefore, within the range as described above, it is possible to easily conform to various optical characteristics as described above at the same time. Further, in the case as described above, in order to stabilize the production, it is preferred that the refractive index of the island phase is higher than the refractive index of the marine phase. It is presumed that the island phase refractive index is high. When light is incident on the island phase from the sea phase, it is not easy to cause total reflection at the interface, and light can be efficiently transmitted, making it difficult to be affected by the film forming apparatus or production conditions. The impact of changes in the structure of the island. If the refractive index of the marine phase is higher than the refractive index of the island phase and the difference is large, there is a possibility that the ratio of total reflection is increased, so that optical characteristics in the film are likely to occur or stable production is difficult. In addition, even in the case where neither of them is a polyolefin-based resin, the same tendency appears in -27-201106021. Although the reason is not clear, the combination of the cyclic polyolefin resin and the polyethylene resin is preferable because the optical characteristics as described above can be stably achieved, and in particular, the self-contradictory characteristics as described above can be coexisted. In addition, it also has excellent economic benefits. The cyclic polyolefin-based resin includes, for example, a cyclic polyolefin structure such as norbornene (norbornene) or tetracyclododecene. These are those which increase the glass transition temperature and allow the island component which is densified by the shearing force or drafting in the die to be rapidly solidified upon cooling, so that it is easy to exhibit stable characteristics. The glass transition temperature is preferably 10 〇 ° C or more, more preferably 1 10 ° C or more, and particularly preferably 1 20 ° C or more. The upper limit is naturally determined depending on the monomer type (Tg of 100% of the cyclic monomer), but is preferably 230 ° C or less, more preferably 200. 〇 Below, it is particularly preferably 1 90 ° C or less. If the upper limit is exceeded, a high temperature is required at the time of melt extrusion, so that it may cause coloring or undissolved matter. Further, the crucible is obtained by measuring the temperature rise rate of 1 〇 ° C / min according to the ISO 1 1 3 5 7- 1, -2, -3 criteria. The cyclic polyolefin-based resin includes, for example, '(1) a ring-opening (co)polymer of a norbornene-based monomer, which is optionally added with maleic acid and added with cyclopentadiene. a resin obtained by hydrogenation after molecular modification; (2) a resin obtained by subjecting a norbornene-based monomer to addition polymerization; (3) an olefin having a norbornene-based monomer and ethylene or an α-olefin A resin obtained by addition copolymerization of a monomer or the like. The polymerization method and the hydrogenation method can be carried out by a conventional method. -28- 201106021 The content of the cyclic component of the cyclic polyolefin resin is preferably from 70 to 90% by mass, more preferably from 7 3 to 85% by mass. Particularly in the case of norbornene, it is preferably in this range. In particular, since the cyclic polyolefin-based resin obtained by copolymerization with ethylene has high affinity with the polyethylene-based resin, it is preferable in terms of properties. The content of ethylene is preferably from 30 to 10% by mass, more preferably from 27 to 15% by mass. The polyethylene resin may be a homopolymer or a copolymer. In the case of the copolymer, it is preferably 50% by mole or more of the ethylene component. The density of the resin or the polymerization method is not particularly limited, but it is preferably used at a density of 0. A copolymer of 909 or less which includes, for example, a copolymer with propylene, butene, hexene, octene or the like. The polymerization method may be either a metallocene catalyst method or a non-metallocene catalyst method. In particular, since a high diffusibility can be stably imparted, a block copolymer of ethylene and octene is preferably used. For example, the resin is IN F U S E (trade name) manufactured by the company Dow Chemical Company (T h e D 〇 w C h e m i c a 1 C 〇 m p a n y). The resin has a crystalline portion due to its block structure, and although it has a low density, it has a high melting point, so that the heat resistance of the obtained anisotropic light-diffusing film can be improved. good. In the case of a combination of a cyclic polyolefin resin and a polyethylene resin, it is preferred to blend 10 to 60% by mass, more preferably 10 to 50% by mass, of the cyclic polyolefin resin in the total amount of the resin. . This range is a preferred range in an embodiment in which the polyethylene resin is used as the sea phase as described later. By satisfying the above-described range and satisfying the requirements as will be described later, an anisotropic light-diffusing film having the optical characteristics as described above can be stably obtained -29-201106021. The melt flow rate of the thermoplastic resin used as the at least two incompatible thermoplastic resins as described above is preferably different between the melt flow rates of the respective thermoplastic resins. By adopting such a mode, the optical characteristics as described above can be stably imparted. The melt flow rate of the resin as described above is appropriately selected in consideration of the composition of the resin, the composition ratio, and the resin to be used as the sea and the desired optical characteristics. The indicator is that if the composition ratio is high and the melt flow rate is high, it will become sea. In the case of the same amount, the melt flow rate is high and it is easy to become sea. If the composition ratio is high, if the melt flow rate is high, there is a possibility that a non-simple sea/island structure is formed, for example, a co-continuous phase is formed. In the case of a combination of a cyclic polyolefin resin and a polyethylene resin, it is preferably. The polyethylene resin is a sea phase, and the melt flow rate of the sea phase polyethylene resin is higher than the melt flow rate of the island phase cyclic polyolefin resin. In the case where the cyclic polyolefin resin is used as the sea phase in the configuration opposite to that described above, it is not easy to obtain the desired effect due to the shear force in the mold, the softness of the sea phase, or the fluidity. The optical characteristics, particularly the anisotropic light-diffusing film having a high diffusivity ratio. According to the embodiment as described above, even when the film forming apparatus is changed, it is possible to stably obtain the optical characteristics of the desired optical characteristics, particularly the anisotropic light-diffusing film having a high diffusion ratio. -30-201106021 In the process of achieving the present invention, the same resin composition can be reproduced under the same conditions, and the optical properties of the obtained anisotropic light-diffusing film cannot be reproduced even when film formation is performed under the same conditions. The case of characteristics. After focusing on the technical problem and focusing on the results of the discussion, it was found that the technical problem can be improved by implementing the mode as described above. On the other hand, in the case where the cyclic polyolefin resin is used as the sea phase in the configuration opposite to the above configuration, it is found that the above problem easily occurs. Although the reason is not clear, it is presumed that the resin of the marine phase is softer than the island phase resin even if there is a change in shearing force or the like due to a difference in extrusion conditions or a difference in mold shape which occurs when the film forming apparatus is changed. And improve its liquidity, thereby mitigating its effects. (Layered Layer of Polyolefin Resin) In the present invention, in the case where a polyolefin-based resin is used in a mixture of at least two kinds of incompatible thermoplastic resins as described above, a preferred embodiment is preferably carried out. The mode is a surface layer mainly composed of a polyolefin resin on at least one side of a layer composed of at least two polyolefin resin mixtures. Hereinafter, a layer composed of a mixture of at least two polyolefin resins is sometimes referred to as a "light diffusion layer". By forming the surface layer as described above, it is possible to suppress the occurrence of deposits caused by the deteriorated resin at the exit of the mold, which is called "eyelid" when the film is melt-extruded. It is preferable to carry out stable continuous film formation for a long period of time. In addition, it is also preferable to suppress the adhesion of the anisotropic light-diffusing film which occurs when a flexible polyolefin-based resin such as a block copolymer of ethylene and octene is used. -31-201106021 The polyolefin-based resin for forming the surface layer as described above is preferably a crystalline resin because it exhibits an effect of suppressing adhesion and the like. A polyolefin resin for forming the surface layer as described above is preferably a polyolefin resin containing a polar group. Thereby, the adhesion between the anisotropic light-diffusing film and other raw materials can be improved, which is preferable. For example, in the case of producing a light-diffusing film laminated sheet as described later, it is desirable to improve the adhesion to the plastic sheet, which is preferable. Further, it is preferable to impart thermal adhesion to an acrylic resin or a polycarbonate resin which is widely used as a material for optics. The polyolefin resin containing a polar group as described above preferably contains at least one of ethylene, propylene, butylene, hexene, octene, methylpentene and a cyclic olefin as a skeleton thereof. It may be a homopolymer of a monomer as described above or a copolymer of two or more monomers. The polyolefin resin containing a polar group as described above in the present invention preferably contains at least one polar group. "Polar group" includes: a carboxylic acid group, a sulfonic acid group, a phosphonic acid group, a hydroxyl group, a glycidyl group, an isocyanate group, an amine group, an oxime imido group, an oxazoline group, an ester group, an ether group, a metal carboxylate. a salt group, a sulfonic acid metal salt group, a phosphonic acid metal salt group, a tertiary amine salt group or a quaternary amine salt group. The polar group may contain one type or two or more types. The composition of the polyolefin-based resin constituting the light-diffusing layer or the type of the member to be adhered to, the necessary adhesion, and the like may be appropriately selected. A preferred mode of implementation is one which contains at least a carboxyl group. Further, the polar group-containing polyolefin resin of the present invention may be one in which a polar group of -32-201106021 is directly introduced into a polymer chain of a polyolefin resin, or may be introduced into another resin' and then added and added. Mix the status obtained. Further, as the case may be, the polyolefin resin of the present invention may be further reacted with a compound which can react with a carboxylic acid group or a hydroxyl group introduced into the end or inside of the molecular chain thereof. To improve the person. In the present invention, the polar group-containing polyolefin resin as described above may be used alone or in combination of two or more. Further, it may be a polyolefin resin which does not contain a polar group or a blended composition in which other kinds of resins are blended. In the case of the blended composition, the polar group-containing polyolefin resin preferably contains 10% by mass or more, more preferably 30% by mass or more. The polar group-containing polyolefin resin as described above is preferably a crystalline resin. It is preferred to use a melting point of 100 to 180 °c. The polar group-containing polyolefin resin is not particularly limited as long as it has the above-described characteristics, but a resin which is commercially available as an adhesive polyolefin resin can be used, for example. For example, ADMER resin (trade name, Mitsui Chemicals, Inc.) ) Manufacturing), Modic Resin (trade name, Mitsubishi Chemical Corp.) )), or ADTEX resin (trade name, Japan Polyethylene Corp. ) Manufacturing), and BONDFAST resin (trade name, Sumitomo Chemical Co., Ltd. )), etc., but are not limited to this. -33-201106021 By laminating a layer composed of a polar group-containing polyolefin resin on the light diffusion layer as described above, it is possible to improve the light diffusion film composed of only a single layer of the light diffusion layer with other materials. Continuity. Further, there is a possibility that the anti-blocking property or the slidability of the film is improved, and the workability and the like of the light-diffusing film are improved. In addition, thermal adhesion to various raw materials can be imparted. The anisotropic light-diffusing film of the present invention can be used in one piece or in two pieces. When two or more sheets are used in combination, they may be used simply by lamination or by using an adhesive or an adhesive. When two or more sheets are used in combination, the respective films are made of a light-diffusing film which does not conform to the characteristics of the present invention as described above, and the manner of conforming to the characteristics of the present invention as described above by lamination is also included in the present invention. In the case of this method, it is preferable to fit in a direction in which the main alignment directions are uniform. When the main alignment directions are not aligned, for example, in the orthogonal direction, the anisotropy may be lowered, and the characteristics as described above may not be obtained, which is not preferable. Further, the anisotropic light-diffusing film of the present invention may be laminated with another optical film such as a light-diffusing film or a lens film having other characteristics. In the case of this method of use, it can be used simply by lamination or by bonding with an adhesive or an adhesive. (Manufacturing Method of Anisotropic Light-Diffusing Film) The method for producing an anisotropic light-diffusing film of the present invention is not particularly limited as long as it satisfies the optical characteristics as described above, but from the viewpoint of economic efficiency In view of the above, it is preferred to form a film by melt extrusion molding. -34-201106021 Method In the present invention, since it is not necessary to contain non-melting fine particles for imparting light diffusibility, even by melt extrusion molding By carrying out, it is also possible to reduce clogging of the molten resin in the filter screen in the film forming process, and therefore it is characterized in that the productivity is excellent and the sharpness of the obtained film is also high. The film forming method by the melt extrusion molding method as described above is not particularly limited, and may be, for example, any of a T-die method and an inflation method. Further, it may be a film in an unextended state or an extension processor. The melt extrusion molding method as described above is generally carried out by extruding a molten resin from a die into a sheet shape by an extruder, and then adhering the sheet to a cooling roll to be cooled and solidified. In the production of the anisotropic light-diffusing film of the present invention, when the cooling roll is adhered as described above, it is preferable that a reservoir zone is not formed at the entrance portion of the adhesion portion. (Also known as "shoal"). The formation of the effusion zone occurs when pressure is applied when the chill roll is pressed, that is, when a strong pressure is applied, it is preferable to reduce the adhesion pressure at the time of the adhesion. For example, it is preferred to avoid the use of a generally widely used method of crimping with a pressure roller to make it adhere. There is no particular limitation as long as it is a method of adhering using a weak pressure, but it is preferred, for example, that the resin melted by the extruder is extruded into a sheet shape by a die, and then the sheet is subjected to gas pressure. The pressing method and/or the suction method and/or the electrostatic sealing method are carried out by adhering and cooling and solidifying to form a film. Since the method can stably obtain the preferable optical characteristics as described above, in particular, it is possible to stably obtain the diffusion of one of the aforementioned characteristics. The 35-201106021 is a high anisotropic light-diffusing film. The previous degree of diffusion greatly changes depending on the influence of the manufacturing apparatus used, etc., so that stable production cannot be performed. Therefore, the results of the discussion on the production method which can be stably produced have been found to be preferably produced by the production method as described above. Although this reason is not clear, it can be estimated as follows. The degree of diffusivity is largely governed by the influence of the phase structure formed by the two incompatible resins of the light diffusing layer. For example, in the case of a sea/island structure, it is governed by the degree of anisotropy of the shape of the island. The diffusivity ratio is increased in proportion to the anisotropy of the shape of the island. That is, if the diffusion ratio is to be increased, it is preferable to increase the anisotropy of the island shape. The shape of the island component in the sheet extruded by the melt extrusion method is thinned by the orientation in the extrusion direction due to the shearing force in the die. Further, after being extruded from the die, the sheet is drawn in a molten state, so that the island shape is more tapered toward the extrusion direction. It is preferred to carry out cooling and solidification in this state. However, when the pressure is pressed by the pressure roller or the like by the pressure roller, the sheet is formed in the inlet portion of the crimping portion due to the uncured state of the sheet at the inlet portion of the crimping portion. The region causes the resin in the uncured state to stay in the region, so that the island component which has been tapered toward the extrusion direction is subjected to the force of the isotropic droplet of the shape due to the surface tension, so that the anisotropy is moderated and changed. Form a shape that tends to be more isotropic. Further, since the shape of the island is improved by cooling and solidifying in the deformed shape, the degree of light diffusivity is increased and the isotropic property is also increased, which adversely affects the diffusion ratio. -36- 201106021 There is no particular limitation on the method of adhering and cooling and solidifying using a gas pressure pressing method and/or a suction method and/or an electrostatic sealing method as described above. For example, the method of pressing the gas pressure includes, for example, pressing with a gas pressure such as air, that is, a method such as a so-called "air knife method", and a "vacuum chamber method" in which a pressure reducing nozzle is attracted to be adhered to it. The "electrostatic adhesion method" that is electrostatically dense. This method can be used alone or in several ways. Since the thickness accuracy of the obtained film can be improved, a preferred embodiment mode is carried out in a method as will be described later. The anisotropic light-diffusing film of the present invention can be produced by any of the methods without stretching and stretching. For example, when a polyester resin is used as the light diffusion layer, it is preferably uniaxially stretched. The stretching ratio is preferably 2 times or more. The upper limit is not particularly limited, but is preferably less than 10 times. Thereby, the island phase can be made into an elongated structure extending in the extending direction, and the light diffusibility in the direction orthogonal to the alignment direction of the island can be remarkably enhanced to secure the target anisotropy and high diffusibility of the present invention. When it is produced by the non-stretching method, the melt-extruded sheet may be stretched before being cooled and solidified, that is, by a method of increasing the draft ratio. Further, the anisotropic light-diffusing film of the present invention may be composed of a single layer or a plurality of layers or more. In the case of a multilayer structure, as long as at least one of the layers is a layer formed of the light-diffusing film formed as described above, the other layer may be a simple transparent layer having no light diffusibility. Further, all of the layers may be composed of a light diffusion layer. In the case of the multilayer structure as described above, it may be produced by a multilayer co-extrusion method -37-201106021 or by an extrusion lamination method or a dry lamination method. The mixture of at least two kinds of incompatible thermoplastic resins as described above may be used in such a manner that the respective thermoplastic resins are blended in an extruder or the like of a film forming step, or may be formed into a mixture by kneading or the like in advance. (Mechanism of Action) As described above, in the present invention, it is necessary to simultaneously conform to many optical characteristics such as total light transmittance, parallel light transmittance, haze, diffusivity, and diffusivity ratio as described above. These characteristics can be met to achieve a high level of properties that could not be achieved with previously known light diffusing films. Therefore, a highly functional light-diffusing film suitable for use as, for example, an illumination device for an LED light source or a backlight device can be obtained. The characteristics described above are each including characteristics that exhibit self-contradictory behavior. For example, full light transmission and other characteristics can show self-contradictory behavior. On the other hand, parallel light transmittance, haze, and diffusivity are macroscopically characterized by a behavior that exhibits proportionality, but at a microscopic level, it cannot be called a proportional relationship. Further, in the present invention, it is necessary to increase the diffusion ratio. Therefore, although it is difficult to express clearly the contribution of each factor to each characteristic, the resin characteristics such as the refractive index difference or the melt flow rate of the non-compatible resin as described above, or the kind or mixing ratio of the respective resins, etc., are Within the scope as described above, and using the manufacturing method as described above, it can be stably achieved. The thickness of the anisotropic light-diffusing film of the present invention is not particularly limited. In general, it is preferably 10 to ΙΟΟΟμηι, more preferably 30 to 500 μm, but it varies greatly depending on the kind of the resin component of the light-diffusing layer, the blending ratio, the layer constitution, and the manufacturing method of -38-201106021. . If these factors are to be defined, the preferred thickness range will tend to be a very narrow range, and the thickness range shown by the prior art is not readily compatible with all of the optical properties previously described. In other words, the thicker the film thickness, the lower the total light transmittance, the lower the haze, the lower the parallel light transmittance, and the higher the degree of diffusion. Therefore, it is possible to adjust the characteristics in consideration of these tendencies. Further, when the thickness is adjusted, if the sea-island structure is largely changed by changing the draft ratio, the extrusion flow rate, the width of the lip, or the like, there is a possibility that the above-described tendency is reversed or extremely large. (Anisotropic light-diffusing film laminated sheet) Another invention of the present invention is to obtain an anisotropic light-diffusing film obtained by the method as described above, and having a thickness of 0. An anisotropic light-diffusing film laminate sheet obtained by laminating a plastic sheet having a total light transmittance of 70 to 100% of 1 to 5 mm. The anisotropic light-diffusing film obtained by the method as described above is excellent in optical characteristics as described above, and can be manufactured economically, but it cannot be used in some applications except for optical characteristics. The characteristics such as heat resistance, heat dimensional stability, mechanical properties such as rigidity, and properties such as flame retardancy. However, by laminating the transparent plastic sheet and the anisotropic light-diffusing film of the present invention, it is possible to make up for the comprehensive characteristics which satisfy the market requirements in addition to the characteristics of the optical characteristics. The transparent plastic sheet used in the present invention is not particularly limited as long as it satisfies the characteristics of thickness and total light transmittance as described above, and is not particularly limited. -39-201106021 The thickness of the transparent plastic sheet is preferably 0. 5 to 3 mm. If it is thinner than 0. At 1 mm, the reinforcing effect or the remedy is insufficient. Further, when it is 5 mm or more, there is a possibility that the economical disadvantage is unfavorable or the flexibility is impaired. The total light transmittance of the transparent plastic sheet used in the present invention is preferably from 80 to 100%, further preferably from 85 to 100%. If it is less than 70%, the characteristics of the anisotropic light-diffusing film as described above cannot be effectively utilized. It is preferred that the total light transmittance is as high as possible and non-diffusive. Further, it is also preferable to use a diffuser as the plastic sheet to exhibit a layering effect. The resin used for the plastic sheet is preferably a resin used for optical use such as a polyester resin, an acrylic resin, a styrene resin, a cyclic polyolefin resin, or a polycarbonate resin, but is not affected by the resin. Limited to these. The method for producing the anisotropic light-diffusing film laminated sheet as described above is not particularly limited. Specifically, it includes a method of bonding an anisotropic light-diffusing film to a plastic sheet. When the method of bonding with an adhesive or an adhesive is used, specifically, the "adhesive" includes a rubber-based adhesive, an acrylic adhesive, a polyoxygen-based adhesive, a vinyl-based adhesive, and the like. Since the anisotropic light-diffusing film laminated sheet of the present invention is likely to be used at a high temperature, it is preferably a stable adhesive at normal temperature to 120 °C. Among them, acrylic adhesives are widely used because of their low cost. Regardless of the adhesive used, the thickness is preferably 0. 5 to 50 μm. -40- 201106021 "Adhesive" is an adhesive that is followed by the aid of heat or a catalyst. Specifically, a polyfluorene-based adhesive, a polyurethane-based adhesive, a polyester-based adhesive, an epoxy-based adhesive, a cyanoacrylate-based adhesive, an acrylic adhesive, or the like can be used. Since the anisotropic light-diffusing film laminated sheet of the present invention is likely to be used at a high temperature, it is preferably a stable adhesive at normal temperature to 120 °C. Among these, the epoxy-based adhesive is particularly suitable for use because it has excellent strength and heat resistance. Since the cyanoacrylate-based adhesive has excellent effect and strength, it can be efficiently utilized for producing a laminated sheet. The polyester-based adhesive has excellent strength and workability, and thus is particularly suitable for producing a laminated sheet. These adhesives can be roughly classified into a heat-curing type, a hot-melt type, and a two-liquid mixing type by the following method, but it is preferable to use a heat-curing type or a hot-melt type which can be continuously produced. Regardless of the type of adhesive used, the thickness is preferably 0. 5 to 50 μm. When the plastic sheet and the anisotropic light-diffusing film as described above are bonded together by an adhesive or an adhesive, if they are bonded by a roll-up or roll-in process using a laminator, a roll can be obtained. A product in the shape of a cylinder or a piece by piece. For example, when an adhesive is used, an adhesive is applied to either of the plastic sheet or the anisotropic light-diffusing film, and after drying, the laminate is laminated with another material to form a layer. The coating method of the subsequent agent is a variety of methods depending on the type of the substrate or the adhesive, and the most widely used are the gravure coater method, the notch wheel coater method, and the reverse coater method. In the gravure rotary coater method, a part of the gravure roller which is immersed in the adhesive is rotated, and the film conveyed by the backing roll is contacted with the gravure roller attached with the adhesive to apply -41 - 201106021, The amount of coating can be adjusted by controlling the number of revolutions of the roller and the viscosity of the adhesive. The reverse coater method is a method similar to the gravure coater method, but the amount of the adhesive attached to the coat roller is adjusted by the metering roller placed in contact therewith. When the bonding as described above is carried out, it may be heated as needed. Further, in order to obtain the necessary bonding strength, heat treatment may also be performed after the lamination. In the case of bonding with an adhesive, a double-sided adhesive sheet can also be used. In the case of this method, although an optically highly transparent type of adhesive is used as a preferred embodiment, it is not particularly limited. For example, an adhesive sheet having light diffusibility can also be used. When the adhesive sheet is used, light diffusibility can be imparted to the adhesive layer. In the present invention, the production of the anisotropic light-diffusing film as described above and the production of the anisotropic light-diffusing film laminate sheet as described above may be carried out by integrating them. That is, it is also possible to melt-extrude a thermoplastic resin blend for constituting the anisotropic light-diffusing film as described above, for example, directly on the surface of the transparent plastic sheet as described above, that is, so-called extrusion lamination Made by law. Further, the roughening treatment as described above may be simultaneously carried out in the step of the melt extrusion lamination method. In the case of the extrusion lamination method, in order to improve the adhesion or adhesion durability of the anisotropic light-diffusing film and the transparent plastic sheet, it is introduced into a tackifying coating process, and a transparent plastic sheet which is easily treated subsequently is used. Such measures are one of the preferred implementation modes. The anisotropic light-diffusing film or the anisotropic light-diffusing film laminate of the present invention-42-201106021 sheet, because of the excellent optical characteristics as described above, is preferably used as a light diffusion device using an illumination device for an LED light source. film. However, it is also not limited thereto, and it is also effective to use, for example, an illumination device that uses a light source other than an LED light source such as a fluorescent lamp. For example, when using an illumination device as a light source of a fluorescent lamp, since the light diffusing property can be exhibited even if the distance between the fluorescent lamp and the light diffusing film or the light diffusing film laminated sheet is close to each other, the thickness of the lighting device can be reduced or The effect of reducing the number of fluorescent lamps. Further, the anisotropic light-diffusing film or the anisotropic light-diffusing film laminated sheet of the present invention has been greatly improved in diffusibility as compared with the conventional light-diffusing film, and is used in an LCD using a fluorescent lamp as a light source. When the luminance is increased, the number of films for optical function adjustment such as a light-diffusing film can be reduced. (Lighting device using LED light source) Another invention of the present invention is to mount an anisotropic light-diffusing film as described above or an anisotropic light-diffusing film laminated sheet as described above to light irradiation using an LED light source A lighting device using an LED light source obtained on the outer or inner surface of the light exit portion of the device. Further, the term "lighting device" means an illuminating device for brightly illuminating an object, a illuminating device for directly illuminating the emitted light, and the like, that is, a device generally called light or a lamp. In the light-emitting device, the method of mounting the light-diffusing film or its laminated sheet is also not particularly limited. For example, an adhesive or an adhesive may be attached to the outer or inner surface of the outer panel of the light exiting portion, or simply laminated. In the case of the attachment method, it is also possible to fix it by using an adhesive or an adhesive in its entirety, or to fix the -43-201106021 in a local manner. Further, in the case of a tubular device like a fluorescent lamp, the light-diffusing film or its laminated sheet can be inserted and mounted on the inner surface thereof along the inner side of the outer tube. Further, it is also possible to mount only the light-diffusing thin-film sheet of the present invention without an outer sheet. In the present invention, the "lighting device" is a device having a function for brightly illuminating a specific place for the purpose, and the type or method of use thereof is not particularly limited. For example, it includes methods of use. The anisotropic diffusion film of the present invention can be made into a light for uniformly illuminating a point of light of a source in a straight line in a single direction. The lighting device of this type can be used as a liquid crystal in the form of a type of notice board or a pointing sign illuminated by a visual side oblique direction, a display of a museum or a product display, a passage or a walkway of a shop, etc., except for a necessary part. Various illumination devices such as a backlight emitting portion or a side light portion of a display or a backlight type billboard, and a photocopier light. In particular, in the case where the LED light sources are arranged in a row in a single direction, the anisotropic diffusion film of the present invention can be effectively realized. After setting the main diffusion direction of the film in parallel with the column of the LEDs, by reducing the number of LEDs, it is also possible to illuminate the column direction linearly and uniformly. Even if the arrangement of the LEDs is not a single column but a plurality of columns, it is It can be used when it is arranged in a slender state. Further, even when the main diffusion direction of the film is set to be orthogonal to the LED, it can be made into a characteristic illumination device. In this case, the tube is not used for lighting, or in some cases, such as the LED lighting device type of the table lamp, the lighting method of the unit is even light. In the case of the case, in the case of the LED light source, when the LED light source is arranged in a single direction, the light can be widely diffused and illuminating in the direction orthogonal to the column. Therefore, it is possible to use the same lighting device as the straight tube fluorescent lamp in the room to uniformly illuminate the room. In addition, wide and uniform illumination can be achieved even when the ceiling has new styles or decorations, or where installations such as restrictions on equipment are limited. In addition, it can be effectively used as a signal, indicator lights for various machines, warning lights, entry lights for aircraft, position indicators for breakwater ends or buoys, driving guide lights embedded in passages, etc., even in the horizontal direction or Drooping The angle of the straight direction changes, but it requires a light-emitting device with a small change in brightness. (Usage method as a backlight device) The anisotropic light-diffusing film or the anisotropic light-diffusing film laminated sheet of the present invention is suitable for use as a luminance or illuminance of a backlight device because it has excellent optical characteristics as described above. Improve the components. It is important that the anisotropic light-diffusing film or the light-diffusing film laminated sheet of the present invention as described above be provided on the light-emitting surface of the backlight unit. At this time, the method of disposing the anisotropic light-diffusing film or the anisotropic light-diffusing film laminated sheet is not particularly limited. They may be simply stacked or fixed with a binder or an adhesive. In addition, it can be fixed by double-sided adhesive tape. Further, it may be disposed at the lowermost portion of the liquid crystal panel for being disposed above the backlight device. By adopting this method, it is possible to effectively exhibit the effect of the present invention as described above -45-201106021. (Backlight unit) As a backlight unit using the anisotropic light-diffusing film or the anisotropic light-diffusing film laminated sheet of the present invention, as long as it is a unit having an exit surface at least on one side, the structure and the like are There are no restrictions. It can also be edge light or straight down. The structure of the light guide plate in the edge light mode is also not limited. The type of reflective film or reflector used for the backlight unit is also not limited. It can be any of white reflective type, metal reflective type and other types. 光源 The light source used for the backlight unit can be made without limitation. For example, it may be any one or a combination of an electric light bulb, a light emitting diode (LED), an electroluminescent panel (EL), a cold cathode tube (CCFL), and a hot cathode tube (HCFL). In the anisotropic light-diffusing film or the anisotropic light-diffusing film laminated sheet of the present invention, the use of such a member can also provide high luminance, reduced angular dependence of luminance, in-plane luminance uniformity, pattern shielding, and the like. The backlight device should have the necessary optical characteristics. Although it is important to use it in one piece, it can be used in two or more pieces, and can also be used in combination with a conventional lens film or a light diffusing film. In addition, other light diffusing sheets or light diffusing sheets may be used. In this case, several kinds of optical members can also be used. It is preferable to appropriately select and use it depending on market demand characteristics or economic efficiency. The backlight device of the present invention is not limited to use as a display device, and can also be used as a light source for the illumination device as described above. The present invention will be more specifically described by the following examples, but the present invention is not limited thereto, and may be appropriately modified and implemented in the spirit and scope of the present invention. However, such matters are all included in the technical scope of the present invention. Further, the measurement and evaluation methods employed in the examples are as follows. In addition, unless otherwise stated, in the embodiment, the phrase "part j means "parts by mass", and the so-called "%" means "% by mass". <Full light transmittance, parallel light transmittance, and haze> A haze meter "NDH-2000" manufactured by Nippon Denshoku Industries Co., Ltd., The measurement was carried out in accordance with the guidelines of JIS K 7136. This measurement is a measurement obtained by measuring the winding direction in which the light-diffusing film is fixed in the sample fixing portion, and the measurement is performed in the vertical direction. Further, when the surface roughness of the light-diffusing film is different, the surface roughness is obtained. The surface of the thicker one is fixed to the light receiving side for measurement. For example, in the case where the light-diffusing film of the roughening treatment is applied only on one side, the measurement is performed by fixing the direction in which the light is actually used. <Measurement method of diffuse transmittance ratio of transmitted light> Measurement using an automatic variable angle photometer (GP-2 00, manufactured by Murakami Color Technology Co., Ltd.) In the transmission measurement mode, the incident angle of light: 0 . (The angle of the sample is up and down, the right and left are right angles), the angle of acceptance: one 90. To 90. (angle on the equator line), filter: ND10, beam aperture: 10.5 mm (VS-l 3.0), light-receiving aperture: 9.1 mm (VS-3 4.0), and angular separation interval -47- 201106021 〇· The measurement was performed under conditions of 1 degree, and the setting of SENSITIVITY or HIGH VO LTON was changed so that the peak of the transmitted light became 40 to 90% of the figure. Thereby, the width (half width) of the half height of the peak height of the variable angle luminosity curve of the transmitted light can be measured. The winding direction of the anisotropic light-diffusing film is fixed in the vertical direction and the horizontal direction to be measured as described above, and it is assumed that the larger half width is DH1, and the smaller one is DL1 to calculate the diffusion ratio. 1 (DH1/DL1). Further, it is assumed that the degree of the angle between the rising angle of the peak and the end angle of the peak is DH2, and the smaller one is DL2 to calculate the diffusion ratio 2 (DH2/DL2) (refer to Fig. 1). The peak rise and end angles are observed with a magnifying glass of 10 times, and the angle at the foremost end where the line of the peak disappears is regarded as the respective angle. By this, you can make a clear judgment. When there is a difference in the surface roughness of the light-diffusing film, the measurement as described above is measured by fixing the direction in which the light is actually used. In addition, the surface of the moving photoreceiver is defined as "equatorial plane". <Refraction of light> The measurement was carried out using an automatic variable angle photometer (GP-200, manufactured by Murakami Color Technology Research Institute Co., Ltd.).

以透射測定模式、光線入射角：〇°(對於試料面成上下 、左右皆爲直角之角度）、受光角度：一90°至90°(赤道線 面上之角度）、濾光片：使用 ND10、光束光圈：10.5 mm(VS-13.0)、受光光圈：9.1mm(VS-3 4.0)及變角間隔爲 0.1度之條件進行測定，並變更 SENSITIVITY或HIGH -48- 201106021 V O LTON之設定使得透射光之波峰頂成爲圖之40至90%來 測定。測出所獲得透射光之變角光度曲線在角度爲0度之 高度（H0)。測出除了變更光線入射角爲60°(赤道線面上之 角度）以外，其餘則以與如上所述條件相同的條件測定時之 透射光之變角光度曲線在角度爲〇度之高度（H60)。使用藉 由該方法所測得之H60與H0，並以下式計算得反曲度（參 閱第2圖）》 光之反曲度=H60/H0xl00(%) (1) 另外，將移動受光器之面定義爲赤道面。 該光之反曲度是在主擴散方向進行測定所獲得。 若光擴散薄膜之表面粗糙度有差異存在時.，則如上所 述測定是以實際使用時光會通過的方向加以固定來進行測 定。 <耐光性> 使用促進耐候試驗機（Suga試驗機股份有限公司（Suga Test Instruments Co_，Ltd.)製造、S 3 00)，以試料面放射照 度：78 W/m2、波長範圍：3 00至400 nm、連續照射、有降 雨（在60分鐘中，降雨12分鐘），在63°Cx50% RH之大氣 下暴露400小時後，評估色差變化。 <平均表面粗糙度比> 使用小坂硏究所股份有限公司（Kosaka Laboratory Ltd.)製造之萬能表面形狀測定器MODEL SE-3C，並以縱倍 率：2000 至 10000、截止（cutoff) : 0.25 mm、測定長度：8 mm、測定速度：0.5 mm/分鐘之條件進行測定。 -49- 201106021 如上所述測定是以經測定光擴散薄膜之捲繞方向及與 該方向成正交的方向之平均表面粗糙度所獲得各自之平均 表面粗糙度之RaV與RaH之比的表面粗糙度比（RaV/RaH) 來表示。該測定是各自實施五次，並使用其之平均値。 <熱塑性樹脂之熔融流動率> 根據JIS K 7210 A法之準則，在23 0°C、2.16 kgf之 條件進行測定。 一部份樹脂是以實施例所揭述之條件進行測定。 <折射率> 樹脂之折射率是根據貝克線法（JIS K7142B法）ISO 489 之準則，且以阿貝折射計（Abbe refractometer)測定鈉-d線 之値。 <使用於使用led光源之照明裝置時之光擴散性之評估> 使用 MoMo Alliance 公司（MoMo Alliance Co.，Ltd.)製 造之40 W天然白色光的透明罩規格之螢光燈型LED照明 燈（MLT-4 0KC)，在該透明罩表面貼附光擴散薄膜或光擴散 薄膜積層薄片，然後從5 cm正上方以數位式相機（KONIC A 1^11^01^八製造之0丨1^八0£八700)攝影照明燈部份之相片， 並以下列基準評估各性能。 該評估是在貼附成使得主擴散方向與螢光燈型LED照 明燈之長軸方向成平行的狀態下進行。 (1 )異向性 以如上所述照片進行下列之判定。 〇： 觀看到螢光燈型LED照明燈之外管的小於30% -50- 201106021 是發亮者： △: 觀看到螢光燈型LED照明燈之外管的30%至 50%是發亮者； X： 觀看到螢光燈型LED照明燈之外管的超過50% 是發亮者。 (2) 明亮度 以實施例1所獲得異向性光擴散薄膜之明亮度爲基準 ，而以比該明亮度爲明亮者爲：◎、相同程度之明亮者爲 :〇、明亮度爲差者爲：X來表示。明亮度是以照片之白 度判斷。 (3) 光點消失性 以如上所述照片進行下列判斷： ◎: 未觀看到光源之光點者； 〇： 稍微觀看到光源之光點者； △: 可清楚觀看到光源之光點者； X : 光源之光點部份是比較明亮者。 〔實施例1〕 將35質量份之降冰片烯-乙烯共聚物的環狀聚烯烴系 樹脂（TOPAS(商標名）6013S-04、Topas Advanced Polymers, Inc.製造、熔融流動率：2.0(230 °C)、折射率：1.53)與65 質量份之由乙烯與辛烯所構成的嵌段共聚合樹脂（陶氏化 學公司製造之INFUSE(商標名）D9817.15、熔融流動率： 26(230°C )、折射率：1.49)，使用池貝鐵工公司（Ikegai Corp·)製造之PCM45擠壓機，在樹脂溫度爲250°C下加以 -51- 201106021 熔融混合，且從T-模擠壓出，然後以鏡面之冷卻輥加以冷 卻，以獲得厚度爲400μιη之異向性光擴散薄膜。在施加該 冷卻時，薄膜對於冷卻輥之密著是使用真空室來實施。所 獲得異向性光擴散薄膜之特性如表1所示。 以本實施例所獲得異向性光擴散薄膜是具有特優的光 擴散之異向性。此外，明亮度爲明亮、且具有特優的光點 消失性，因此作爲異向性光擴散薄膜是屬於高品質者。 此外，根據耐光性試驗之色差爲1.0,因此也具有特優 的耐光性。 〔實施例2〕 在實施例1之方法中，除了樹脂之摻合變更爲50質量 份之環狀聚烯烴系樹脂（TOPAS(商標名）6015S-04、Topas Advanced Polymers，Inc·製造、熔融流動率：0.41(230 °C) 、折射率：1.53)與50質量份之由乙烯與辛烯所構成的嵌 段共聚合樹脂（陶氏化學公司製造之INFUSE(商標名 )D9 101.15、熔融流動率：2.1 (23 0°C )、折射率：1.49)、且 變更薄膜厚度爲2 00 μπι以外，其餘則以與實施例1相同的 方法獲得異向性光擴散薄膜。 所獲得異向性光擴散薄膜之特性如表1所示。 以本實施例所獲得異向性光擴散薄膜，雖然光點消失 性是比以實施例1所獲得異向性光擴散薄膜爲差，但是光 擴散之異向性或明亮度卻比以實施例1所獲得異向性光擴 散薄膜更爲優異，因此作爲異向性光擴散薄膜是屬於高品 質者。 -52- 201106021 此外，根據耐光性試驗之色差爲ι·〇,因此也具有特優 的耐光性。 〔實施例3〕 在實施例2之方法中，除了設定薄膜厚度爲150 μπι以 外，其餘則以與實施例2相同的方法獲得光擴散薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本實施例所獲得光擴散薄膜是明亮度之擴散雖然比 以實施例1所獲得光擴散薄膜稍微差，但是明亮度卻優越 ，因此作爲異向性光擴散薄膜是屬於高品質者。 此外，根據耐光性試驗之色差爲1.0,因此也具有特優 的耐光性。 〔實施例4〕 在實施例1之方法中，除了樹脂之摻合變更爲50質量 份之環狀聚烯烴系樹脂（TOPAS(商標名）5013 S-04、Topas Advanced Polymers, Inc.製造、熔融流動率：8.7(230 °C)) 與50質量份之由乙烯與辛烯所構成的嵌段共聚合樹脂（陶 氏化學公司製造之IN FUSE(商標名）D9817.15、熔融流動率 :26(23 0°C ))，並變更薄膜厚度爲200μιη以外，其餘則以 與實施例1相同的方法獲得異向性光擴散薄膜。 所獲得異向性光擴散薄膜之特性如表1所示。以本實 施例所獲得異向性光擴散薄膜是具有與以實施例2所獲得 異向性光擴散薄膜同等之特性，因此作爲異向性光擴散薄 膜是屬於高品質者。 此外，根據耐光性試驗之色差爲1.0，因此也具有特優 -53- 201106021 的耐光性。 〔實施例5〕 在實施例1之方法中，除了樹脂之摻合變更爲50質量 份之環狀聚烯烴系樹脂（TOPAS(商標名）6015S-04 ' Topas Advanced Polymers，Inc.製造、熔融流動率：0.41(230 °C)) 與50質量份之由乙烯與辛烯所構成的無規共聚合樹脂（陶 氏化學公司製造之 ENGAGE(商標名）8137、熔融流動率： 30(190°C)、折射率：1.52)、且變更薄膜厚度爲200μηι以 外，其餘則以與實施例1相同的方法獲得異向性光擴散薄 膜。 所獲得異向性光擴散薄膜之特性如表1所示。以本實 施例所獲得異向性光擴散薄膜是具有與以實施例2所獲得 異向性光擴散薄膜同等之特性，因此作爲異向性光擴散薄 膜是屬於高品質者。 此外，根據耐光性試驗之色差爲1.0,因此也具有特優 的耐光性。 〔實施例6〕 將85質量份之藉由真空乾燥機在18(TC下乾燥3小時 ，使其充分地移除水份且實質地不含潤滑劑之聚對苯二甲 酸乙二醇酯樹脂（極限黏度：0.62(苯酚/四氯乙烷= 60/40) 與15質量份之Prime Polymer Co.，Ltd.製造之低密度聚乙 烯樹脂（SP 1 540)之混合物飼入於單軸擠壓機中，在28(TC加 以熔融並經由過濾器、齒輪泵加以移除異物、擠出量之均 整化後，以薄片狀從T-模擠出至經控制溫度爲25 °C之冷卻 -54- 201106021 轉筒上。此時，則使用直徑爲0.1mm之線狀電極施加靜電 使其密著於冷卻轉筒，以獲得未延伸薄膜。其次，朝著長 軸方向在103 °C溫度下實施長軸方向延伸5.0倍，以獲得厚 度爲150 μιη之異向性光擴散薄膜》 所獲得異向性光擴散薄膜之特性如表1所示。以本實 施例所獲得異向性光擴散薄膜是屬於高品質。但是，根據 耐光性試驗之色差變化卻爲3.7，耐光性是比以實施例1 至5所獲得異向性光擴散薄膜者稍微差。 〔實施例7〕 在實施例6之方法中，除了將低密度聚乙烯樹脂變更 爲改質聚丙烯系樹脂（大日精化色彩和化學製造股份有限 公司（Dainichiseika Color & Chemicals Mfg. Co.，Ltd.)製造 之CAP3 5 0)、且變更薄膜厚度爲200μπι以外，其餘則以與 與實施例6相同的方法獲得異向性光擴散薄膜。 所獲得異向性光擴散薄膜之特性如表1所示。以本實 施例所獲得異向性光擴散薄膜是具有與以實施例6所獲得 異向性擴散薄膜同等之品質。 〔實施例8〕 將50質量份之氟系樹脂（KYNAR 720(PVDF)、Arkema 公司（Arkema Co. Ltd.)製造、熔融流動率：10(230 °C、5 kgf))與50質量份之聚甲基戊烯系樹脂（TPX(商標名）DX820 、三井化學股份有限公司製造、熔融流動率：110(260 °C、 5 kgf)、折射率：1.46(文獻値）），使用池貝鐵工公司製造之 PCM45擠壓機’在25(TC樹脂溫度下加以熔融混合，且從 -55- 201106021 T-模擠壓出，並以鏡面之冷卻輥加以冷卻，以獲得厚度爲 22 5 μιη之異向性光擴散薄膜。在施加該冷卻時，薄膜對於 冷卻輥之密著是使用風刀來實施。此外，在單面施加電暈 處理（corona treatment)。 所獲得異向性光擴散薄膜之特性如表1所示。以本實 施例所獲得異向性光擴散薄膜作爲異向性光擴散薄膜是屬 於高品質者。 此外，根據耐光性試驗之色差爲0.9,因此也具有特優 的耐光性。 〔實施例9〕 將50質量份之氟系樹脂（KYNAR 720(PVDF)、Arkema 公司製造、熔融流動率：10(230 °C、5 kgf))與50質量份之 環狀聚烯烴系樹脂（TOPAS(商標名）6013S-04、Topas Advanced Polymers, Inc.製造、熔融流動率：2.1(230 °C、 2.16 kgf))，使用池貝鐵工公司製造之PCM45擠壓機，在 2 5 0°C樹脂溫度下加以熔融混合，且從T-模擠壓出，並以 鏡面之冷卻輥加以冷卻，以獲得厚度爲70μπι之異向性光 擴散薄膜。在施加該冷卻時，薄膜對於冷卻輥之密著是使 用真空室來實施。此外，在單面施加電暈處理。 所獲得異向性光擴散薄膜之特性如表1所示。以本實 施例所獲得異向性光擴散薄膜作爲異向性光擴散薄膜是屬 於高品質者。 此外，根據耐光性試驗之色差爲1.0,因此也具有特優 的耐光性。 -56- 201106021 〔比較例1〕 在實施例1中，除了變更爲經施加梨皮面加工之冷卻 輥，且變更爲使用鏡面之壓輥來壓著於冷卻輥加以冷卻以 外，其餘則以與實施例1相同的方法獲得光擴散薄膜° 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是光擴散之異向性差， 因此作爲異向性光擴散薄膜是屬於低品質者。 〔比較例2〕 將35質量份之環狀聚烯烴系樹脂（TOPAS(商標名 )6015S-04、Topas Advanced Polymers, Inc.製造、熔融流動 率：0.41(230 °C))與65質量份之由乙烯與辛烯所構成的嵌 段共聚合樹脂（陶氏化學公司製造之INFUSE(商標名 )D9 8 07.1 5、熔融流動率：29(23 0°C))，使用池貝鐵工公司 製造之PCM45擠壓機，在2 5 0°C樹脂溫度下加以熔融混合 ，且從T-模擠壓出，並以鏡面之冷卻輥加以冷卻，以獲得 厚度爲3 00 μιη之光擴散薄膜。在施加該冷卻時，薄膜對於 冷卻輥之密著是使用真空室來實施。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是光擴散之異向性差， 因此作爲異向性光擴散薄膜是屬於低品質者。 〔比較例3〕 將5 3質量份之聚丙烯樹脂（住友化學股份有限公司製 造、住友NOBRENEFS20 11DG3)與47質量份之乙烯.丁稀 共聚物（三井化學股份有限公司製造、TAFMER A1085S)在 -57- 201106021 60mm(p單軸擠壓機（L/D: 22)內，在240°C樹脂溫度下加以 溶融混合，且從T -模擠壓出後’在20 °C之流延輕（casting r〇 11)加以冷卻，以獲得未延伸薄片。接著，將該未延伸薄 片利用縱向延伸機之輥周速差在1 1 8 °C延伸溫度下加以5延 伸4.5倍，接著，對其之單面施加電暈處理，以獲得厚度 爲2 0 0 μιη之光擴散薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是光點消失性及擴散度 差，因此作爲異向性光擴散薄膜是屬於低品質者。 〔比較例4〕 將95質量份之藉由真空乾燥機在180 °C下乾燥3小時 ，使其充分地移除水份且實質地不含潤滑劑之聚對苯二甲 酸乙二醇酯樹脂（極限黏度：0.62)與5質量份之Prime Polymer Co·, Ltd.製造之低密度聚乙烯樹脂（SP 1 540)之混 合物飼入於單軸擠壓機中，在280°C下加以熔融並經由過 濾器、齒輪泵加以移除異物、擠出量之均整化後，以薄片 狀從T-模擠出至經控制溫度爲2 5 °C之冷卻轉筒上。此時， 則使用直徑爲0.1 mm之線狀電極施加靜電使其密著於冷 卻轉筒，以獲得未延伸薄膜。其次，朝著長軸方向在103 °C 溫度下實施長軸方向延伸3.0倍，以獲得厚度爲75μιη之光 擴散薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是與以比較例2所獲得 光擴散薄膜相同地光點消失性及擴散度差，因此作爲異向 -58- 201106021 性光擴散薄膜是屬於低品質者。 〔比較例5〕 在厚度爲250μιη之高透明性聚酯薄膜（東洋紡織股份 有限公司（Toyobo Co·，Ltd.)製造之 Cosmoshine Α4300)之 單面上，將50質量份之平均粒徑爲3μπι之真球狀的丙烯 酸系樹脂粒子（東洋紡織股份有限公司製造之TAFT 1C (商 標名）FH-S 3 00)與50質量份之聚胺基甲酸酯樹脂的混合物 使用塗佈機塗佈並加以乾燥使得乾燥後之厚度爲25μηι以 獲得光擴散薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是光擴散之異向性差， 因此作爲異向性光擴散薄膜是屬於低品質者。 〔比較例6〕 在厚度2 5 0 μιη之高透明性聚酯薄膜（東洋紡織股份有 限公司製造之CosmoshineA4300)之單面上，將厚度爲奈米 級大小之極薄片狀二氧化矽粒子（AGC Si-Tech Co.，Ltd.製 造之SUN LOVELY(商標名）LFS HN 050)，在不摻合黏結劑樹 脂（binder resin)下，使用塗佈機塗佈並加以乾燥使得乾燥 後之厚度爲30μιη，以獲得光擴散薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是光擴散之異向性差、 且全光線透射率爲低、明亮度差，因此作爲異向性光擴散 薄膜是屬於低品質者。 〔比較例7〕 -59- 201106021 將由表面經壓紋加工之聚碳酸酯樹脂所構成的光擴散 薄膜之特性加以評估。 結果如表1所示。 以本比較例所獲得光擴散薄膜是光擴散性之異向性爲 低、平行光線透射率爲髙、且光點消失性或明亮度之擴散 較差，因此作爲異向性光擴散薄膜是屬於低品質。 此外，色差變化爲9.5之高値，因此耐光性差。 〔比較例8〕 在實施例6之方法中，除了變更延伸倍率爲1.5倍、 且所獲得薄膜之厚度爲2 5 μιη以外，其餘則以與實施例6 相同的方式獲得光擴散薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是雖然明亮度爲特優， 但是由於平行光線透射率爲髙、霧度爲低，因此光點消失 性差。此外，異向性也差，因此作爲異向性光擴散薄膜是 屬於低品質者。 〔比較例9〕 在實施例6之方法中，除了變更所獲得薄膜之厚度爲 2 00 μιη以外，其餘則以與實施例6相同的方式獲得光擴散 薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是雖然異向性或光點消 失性爲特優，但是明亮度卻差’因此作爲異向性光擴散薄 膜是屬於低品質者。 -60- 201106021 〔比較例1 〇〕 在實施例7之方法中，除了變更延伸倍率爲1.5倍、 且所獲得薄膜之厚度爲2 5 μιη以外，其餘則以與實施例6 相同的方式獲得光擴散薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是雖然明亮度爲特優， 但是由於平行光線透射率爲高、霧度爲低，因此光點消失 性差。此外，異向性也差，因此作爲異向性光擴散薄膜是 屬於低品質者。 〔比較例1 1〕 在實施例7之方法中，除了變更所獲得薄膜之厚度爲 3 00 μιη以外，其餘則以與實施例6相同的方式獲得光擴散 薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是雖然異向性或光點消 失性爲特優，但是明亮度卻差，因此作爲異向性光擴散薄 膜是屬於低品質者。 〔比較例1 2〕 在實施例8之方法中，除了變更所獲得薄膜之厚度爲_ 3 5 Ομιη以外，其餘則以與實施例6相同的方式獲得光擴散 薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是雖然異向性或光點消 失性爲特優，但是明亮度卻差，因此作爲異向性光擴散薄 -61 - 201106021 膜是屬於低品質者。 〔比較例1 3〕 在實施例9之方法中，除了變更所獲得薄膜之厚度爲 1 2 5 μιη以外，其餘則以與實施例6相同的方式獲得光擴散 薄膜。 所獲得光擴散薄膜之特性如表1所示。 以本比較例所獲得光擴散薄膜是雖然異向性或光點消 失性爲特優，但是明亮度卻差，因此作爲異向性光擴散薄 膜是屬於低品質者。 〔實施例1 〇〕 將藉由實施例1至9所獲得異向性光擴散薄膜，與厚 度爲250μιη且全光線透射率爲92%之高透明聚酯薄膜（東 洋紡織股份有限公司製造之Cosmoshine Α4300)以光學雙 面黏著片加以貼合，以獲得異向性光擴散薄膜積層薄片。 結果，任一種積層薄片皆具有與各自之異向性光擴散 薄膜同等之光學特性，作爲使用LED光源之照明裝置用之 光擴散材是屬於高品質者。並且，所獲得異向性光擴散薄 膜積層薄片，其耐熱性或強度等非光學特性是比以實施例 1至9所獲得異向性光擴散薄膜爲更高❶ 〔實施例1 1〕 將以實施例1至9之方法所獲得異向性光擴散薄膜， 在實施例1至9之方法中，在進行如上所述冷卻時，將薄 膜對於冷卻輥之密著方式變更爲壓輥方式，在壓輥側使用 聚胺基甲酸酯系之接著劑，並使經增黏塗佈劑加以表面處 -62- 201106021 理之厚度爲200 μηι且全光線透射率爲88 %之聚碳酸酯薄片 通過’以獲得經積層聚碳酸酯薄片之異向性光擴散薄膜積 層薄片。另外’此時，則將擠出量、擠出壓力加以調整成 不至於造成積液區。 以本實施例所獲得異向性光擴散薄膜積層薄片是具有 與以實施例1至9所獲得異向性光擴散薄膜同等之光學特 性，作爲使用LED光源之照明裝置用之光擴散材是屬於高 品質者。並且，耐熱性或強度等非光學特性是比以實施例 1至9所獲得光擴散薄膜爲更高。 〔實施例1 2〕 使用MoMo Alliance公司製造之40 W天然白色光的透 明罩規格之螢光燈型LED照明燈（MLT-40KC)，在該透明罩 表面以光學用之雙面膠帶貼附藉由實施例1至9所獲得異 向性光擴散薄膜，使得主擴散方向與螢光燈型LED照明燈 之長軸方向成正交的方向》結果點狀之LED光源之光則變 成細小線狀之光。 〔實施例1 3〕 在實施例12中，以光學用之雙面膠帶貼附異向性光擴 散薄膜，使得主擴散方向與螢光燈型LED照明燈之長軸方 向成爲平行之方向。結果，可觀看到點狀之LED光源之光 是朝與螢光燈之長軸方向成正交的方向呈切成細小的圓狀 而發光。 〔比較例1 4〕 使用藉由比較例1至1 3所獲得光擴散薄膜，以與實施 -63- 201106021 例1 2或1 3相同的方式進行評估。結果，以任一比較例所 獲得光擴散薄膜之全部，則在異向性、光點消失性及明亮 度之特性中，至少有一特性爲差。例如，異向性爲低之薄 膜，則將光擴散薄膜貼附成使得薄膜捲繞方向與螢光燈型 LED照明燈之長軸方向成平行或正交之方向，但是貼附於 任何方向，光仍然以等向性的擴散而不能將光於集光特定 方向。此外，光點消失性爲差之薄膜，LED光源之強光則 殘留在光源位置，使得明亮度之均勻性差。此外，明亮度 不佳的薄膜，則導致明亮度不足。 〔實施例1 4〕 使用兩台熔融擠壓機，以第一擠壓機使得35質量份之 環狀聚烯烴系樹脂（TOPAS(商標名）6013S-04、Topas Advanced Polymers, Inc.製造、熔融流動率：2.0(230 °C、 2.16 kgf))與65質量份之由乙烯與辛烯所構成的嵌段共聚 合樹脂（陶氏化學公司製造之INFUSE(商標名）D9817.15、 熔融流動率：26 (23 0 °C、2.16 kgf))作爲光擴散層，而以第 二擠壓機以能使得聚丙烯系之接著性樹脂（ADMER(商標名 )QF551、三井化學股份有限公司製造、熔融流動率： 5.7(190 °C、2.16 kgf))成爲兩表層（熱密著層）之方式，以T-模方式加以熔融共擠出後，以鏡面之冷卻輥加以冷卻，藉 此可獲得總厚度爲400 μιη之兩面經積層熱密著層之異向性 光擴散薄膜。熱接著層之厚度爲兩面皆設定爲40 μιη。在進 行如上所述冷卻時，薄膜對於冷卻輥之密著是以與實施例 1相同的方法來實施。結果，即使經長時間連續製膜也並 -64- 201106021 未觀看到發生眼屎。 以本實施例所獲得異向性光擴散薄膜之特性如表！所 不 ° 所獲得異向性光擴散薄膜是具有與實施例1同等之光 學特性、且具有特優的熱接著性，因此藉由熱接著於基材 上，則可提高異向性光擴散薄膜之尺寸穩定性。 另外，熱接著性及尺寸穩定性是以下列方法進行評估 ，結果任何者皆爲〇。 在另一方面，若以實施例1之方法實施時，在長時間 連續製膜的情況，則有發生眼屎的情況。 <熱接著性> 在熱壓機之固定台上設置厚度爲3 mm之表面是呈平 滑且透明的壓克力板（三菱嫘縈股份有限公司（Mitsubishi Rayon Co.，Ltd.)製造：ACRYLITE)，並在該壓克力板上放 置試料，並且，在其上面鋪上厚度爲3 mm(硬度HsA50°) 之聚矽氧橡膠薄片，然後以表面溫度設定於180 °C加壓用 壓頭由該聚矽氧橡膠薄片上方壓住，且以49 N/cm2之壓力 加壓3 0秒鐘。經加熱壓著後，在溫度2 31、相對濕度爲 65 %之環境下自然冷卻30分鐘，然後以使用東洋精機股份 有限公司（Toyo Seiki Co.，Ltd.)製造之「TENSILON」 (UTM-IIIL)以3 00 mm/分鐘之速度加以剝離180度時之抗 拒力値作爲密著力。 密著力之判定是以下列基準實施： 〇： 密著力爲〇.1 N/1 5 mm以上； -65- 201106021 X: 密著力爲低於0.1 N/15mm。 <尺寸穩定性> 將根據如上所述熱接著性評估法，經在壓克力板熱接 著異向性光擴散薄膜所獲得之試樣，靜置於經調溫成80°C 之烘箱歷時240小時加溫處理後，測定異向性光擴散薄膜 之縱及橫方向之尺寸，然後與加溫處理前的各自尺寸相比 較，並以下列基準進行判定： 〇： 由於加溫處理之尺寸變化在任何方向皆爲小於 0 _ 1 % 時； X: 由於加溫處理之尺寸變化至少任一方爲0.1 %以 上時。 〔實施例1 5〕 在實施例14之方法中，除了將從第二擠壓機擠壓出之 樹脂從聚丙烯系之接著性樹脂（ADMER(商標名）QF551、三 井化學股份有限公司製造、熔融流動率：5.7(190°C ))變更 爲聚丙烯樹脂FS20UDG3(住友化學股份有限公司製造、住 友NOBRENE(商標名））以外，其餘則以與實施例14相同的 方法獲得異向性光擴散薄膜。 以本實施例所獲得異向性光擴散薄膜之特性如表1所 示。 所獲得異向性光擴散薄膜是具有特優的光擴散特性， 且即使經長時間連續製膜也未觀看到發生眼屎。但是，熱 接著則比以實施例1 4所獲得異向性光擴散薄膜爲差。 〔實施例1 6至2 0〕 -66- 201106021 分別使用藉由各實施例1、2、5、6及8所獲得異向性 光擴散薄膜，並以如下所述方法測定使用於液晶顯示裝置 用背光裝置時之正面輝度、輝度之角度相依性及圖案遮蔽 性。結果如表2所示。 以任何實施例所獲得異向性光擴散薄膜，如各實施例 所揭述皆具有特優的光學特性，並且，由於光之反曲度爲 高，使用一片異向性光擴散薄膜之正面輝度高，且輝度之 角度相依性又少，加上具有特優的圖案遮蔽性，因此作爲 液晶顯示裝置用背光裝置之輝度提高構件是屬於高品質者 〇 <使用於液晶顯示裝置用背光裝置時之正面輝度> 在長徑側（橫方向）之兩側各自設置三支冷陰極管的19 英寸之導光板型（使用白色反射薄膜且爲網眼型）背光單元 之出射光側的壓克力板上大致中央部，設置40 mm x60 mm 見方（6 0 mm側爲橫方向）之評估試樣（單純的疊合設置，若 試料因捲曲等而浮起時，則以膠帶固定四角。），並將經設 置30 mm><50 mm見方（50 mm側爲橫方向）剪下部份的黒色 遮光紙設置成使得剪下部份之中心位於評估試樣之中心部 ，然後在暗室測定輝度。黑色遮光紙是選用能覆蓋背光單 元全體之大小並在加以固定成光不至於漏出下進行測定。 此外，背光單元是在設置成水平下進行測定。 該輝度是使用 Topcon Technohouse 公司（Topcon Technohouse Corporation)製造之 TOPCON 分光放射計 SR-3A，在測定角度爲2度下，與背光單元表面之距離爲 -67- 201106021 4 0 cm，且使評估用試樣之中心位於正下方的位置進行測定 〇 在本測定中，評估用試樣是設置成使得主擴散方向與 冷陰極管之長軸方向成正交的方向來實施。 <使用於液晶顯示裝置用背光裝置時之輝度之角度相依性 > 除了將 TOPCON分光放射計 SR-3A設置成使得 TOPCON分光放射計SR-3A與評估用試樣之中心之角度是 比對於背光單元表面之垂線傾斜3 5度的位置以外，其餘則 以與如上所述之正面輝度相同的方法測定輝度。並將該輝 度除以如上所述之正面輝度所獲得之値作爲輝度之角度相 依性。該値愈大，則可稱爲輝度之角度相依性愈爲優異， 且最佳爲1.0。 <使用於液晶顯示裝置用背光裝置時之圖案遮蔽性> 將在如上所述正面輝度測定之開口部以點燈背光的狀 態下加以肉眼觀察，並進行下列判定。 〇： 完全未觀看到導光板之網眼的情況； △: 稍微觀看到導光板之網眼的情況； X : 可清楚觀看到導光板之網眼的情況。 〔比較例1 4及1 5〕 使用藉由各比較例3及7所獲得光擴散薄膜，並以與 實施例1 6至20與相同的方法測定使用於液晶顯示裝置用 背光裝置時之正面輝度、輝度之角度相依性及圖案遮蔽性 。結果如表2所示。 -68- 201106021 以本比較例所獲得光擴散薄膜是圖案遮蔽性差。 〔比較例1 6〕 使用市售之微透鏡薄膜，以與實施例16至20相同的 方法測定使用於液晶顯示裝置用背光裝置時之正面輝度、 輝度之角度相依性及圖案遮蔽性。結果如表2所示。 該微透鏡雖然正面輝度爲高，但是輝度之角度相依性 卻爲差。此外，僅使用一片該微透鏡時，圖案遮蔽性也爲 差。 〔比較例1 7〕 使用經以使用於市售背光裝置之珠粒塗佈法所製造之 光擴散薄膜’且以與實施例1 6至2 0相同的方法測定使用 於液晶顯示裝置用背光裝置時之正面輝度、輝度之角度相 依性及圖案遮蔽性。結果如表2所示。 該光擴散薄膜是僅使用一片時，輝度之角度相依性及 圖案遮蔽性爲差。 〔比較例1 8〕 使用配備於測定正面輝度及輝度之角度相依性所使用 之背光單元的由上擴散薄膜/稜鏡透鏡薄膜/下擴散薄膜所 構成的光學薄膜組’並以與實施例1 6至2 0相同的方法， 測定使用於液晶顯示裝置用背光裝置時之正面輝度、輝度 之角度相依性及圖案遮蔽性。結果如表2所示。 該薄膜組雖然正面輝度或圖案遮蔽性是特優，但是輝 度之角度相依性卻爲差。此外，由於片數多，經濟效益性 則差。 -69- 201106021 〔實施例2 1至2 3〕 對於藉由實施例1、5及8所獲得異向性光擴散薄膜， 以如下所述方法測定使用於液晶顯示裝置用背光裝置時之 面內輝度均質性。結果如表3所示。任何實施例所獲得異 向性光擴散薄膜皆爲平均輝度爲高、且面內輝度均質性爲 高’因此作爲背光裝置用之光擴散薄膜是屬於高品質。 <使用於液晶顯示裝置用背光裝置時之面內輝度均質性> 將20英寸且配備12支冷陰極管之直下方式背光單元 之光擴散壓克力板變更爲透明壓克力板，且在該透明壓克 力板上大致中央部放置A-4尺寸之試樣，並以膠帶固定四 角，然後使用HI-LAND公司製造之高功能輝度及色度計測 系統（RISA)，在暗室以點燈背光單元的狀態下，測定試樣 中央部100x220畫素面積的輝度。輝度是測定最大輝度、 最小輝度、平均輝度。面內輝度均質性則以如上所述方法 所測得最小輝度/最大輝度之比來表示。該値愈小，則輝度 斑愈小。 如上所述冷陰極管是使用設定成使得冷陰極管之長軸 方向成爲背光單元之長軸方向（橫方向）者。輝度測定裝置 是設置於試樣之大致中心部之正上方*且透明壓克力板表 面與輝度計入射光面之距離則設定於120cm的位置來進行 測定。 背光單元是設置於水平來進行測定。 在本測定中，評估用試樣是設置成使其之主擴散方向 成爲與冷陰極管之長軸方向成正交的方向來實施》 -70- 201106021 〔比較例1 9〕 在並未設置光擴散薄膜下，測定面內輝度均質性。結 果如表3所示。 雖然最大輝度是明顯地爲高，但是面內輝度均質性卻 明顯地爲低。因此’明顯地顯示如上所述實施例薄膜之光 學特性控制功效的大小。 〔比較例20至22〕 就使用於各比較例7、16及17之光擴散薄膜分別進行 測定面內輝度均質性。結果如表3所示。 雖然任一者之擴散薄膜皆爲最大輝度高，但是面內輝 度均質性卻低’若僅使用一片光擴散薄膜時，則性能不足 夠。 〔比較例2 3〕 變更背光裝置用光擴散薄膜，而就配備於測定面內輝 度均質性所使用之背光單元的由上擴散薄膜/稜鏡透鏡薄 膜/下擴散薄膜所構成的光學薄膜組，測定面內輝度均質性 。結果如表3所示。 雖然最大輝度爲高，但是面內輝度均質性卻爲差。此 外，薄膜之片數多，因此經濟效益性差。 -71 - 201106021 I< 明亮度 〇 ◎ 〇 〇 ◎ 〇 〇 ◎ 〇 〇 〇 X 〇 ◎ ◎ ◎ X ◎ ◎ X ◎ X X X 光點 消失性 ◎ 〇 < ◎ 〇 < < < ◎ ◎ ◎ 〇 X X 〇 〇 X X 〇 X ◎ ◎ ◎ 異向性 <] 〇 〇 〇 〇 〇 〇 〇 〇 < X X 〇 〇 X X X X 〇 X 〇 〇 〇 V0 § rn p—< o <N ro o ro <N <N «〇 <N 卜 oi 00 <N o o Ψ-* 00 ο o ο o »* (N oi o m <N (N (N <N (N ^ 耜S 奪S o (N w-i Os On <N 00 CO rvj H CN r*^ (N 00 ri o p p o v〇 — ο o ο o <N <N 00 〇 DL2 (度） ON v〇 沄 fO v〇 (N *T) g 00 S s 5〇 P o 00 oo o s g <N OO g 〇\ 〇\ 〇 (N Ό DH2 (度） CN v〇 Os (N CN VO ΓΛ 00 o **· 卜 o 1·^ rn 00 fS g in 00 On 00 00 ON cs *·« OO _ S ^ X m 〇 s^/ 卜 <N <N — rn »〇 00 (N <N 00 *τί »〇 00 »〇 o V··* 00 (N 〇s CN (N KTi o o — p o p m CO 00 00 — yn rn VO wS Q CN 00 (N v-> 艺 〇\ Ό m (N 00 o <N o 00 S DH1 〇\ o 卜 ^-H 〇\ «/Ί ΓΛ s 00 V«0 Os Ό (N 00 cn v〇 MM CN 00 <N (N 00 »n o 00 00 On v〇 <N s〇 霧度 (%) 99.0 »〇 'O On 85.0 99.0 1 98.0 I I 93.71 1 92.9 | L92^J ! 93.7 I — 97.5」 97.2 99.3 1 I 98.6 J ：22.9 LtmJ 1 95.0 J 95.2 m S 00 .96.5 o JO 00 Os 99.0 94.5 5 ^ ^ f ^ w \〇 d 〇 rn o 00 00 o <N (N 寸· o v〇 r-； — v〇 d (N 69.7 ! 24.5 卜 cn o 卜 00 25.0 <N r^t 22.0 00 o 寸 d o — 全光線 透射率 (%) v-j 00 v〇 〇0 o ss ro On a\ 〇〇 Os Ό 寸 o | 74.4 I o ΓΛ 00 <N rn oo 卜 \ό 00 Tf 00 00 ύ p v〇 ro o <N v〇 o 00 00 o <N v〇 1 59.0 I o oo <n |實施例i 1 1實施例2」 |實施例3 |實施例4 1實施例5 |實施例6 I |實施例7 I |實施例8 I |實施例9 實施例14 實施例15 |比較例i |比較例2 |比較例3 比較例4 |比較例5 比較例6 |比較例7 |比較例8 |比較例9 比較例10 比較例11 1比較例12 比較例13 -IL_ 201106021 比較例18 1 1 1 1 1 1 1650 1 750 1 0.45 1 〇 比較例Π 1 (N I 97.5 1640 1320 0.81 0 比較例16 1 (N 〇 94.4 1770 Γ 1350 0.76 X 比較例15 比較例7 00 00 〇 80.3 1350 i 1120 0.83 X 比較例14 比較例3 yr) o 22.9 1210 1 1190 0.98 X 實施例20 實施例8 s 00 »n 00 92.5 1405 1 1400 ο 〇 實施例19 |實施例6 1 cn VO 00 卜 | 93.7 | 1380 1 1375 ο 〇 實施例18 |實施例5 | ON u-» r- (N <N <N (S m 98.0 .1400 1 1405 ο 〇 實施例17 |實施例2 1 沄 (N (N — 96.5 1450 丨 1415 0.98 〇 實施例16 實施例1 OS SO »〇 (N 卜 (N 99.0 1410 1410 ρ 〇 使用薄膜 | DHO (度） | DLO (度） I DLO/DHO 反曲度（％) (H60/H0) 1霧度（％) 1 o 但 4 <s 1 Q ttsi >r> Cl 輝度之角度依存性* 1光點消失性 _iL_ 201106021 e< 面内輝度均質性 (Cd/m2) 0.94 0.94 0.84 0.13 0.36 0.50 0.47 0.75 平均輝度 (Cd/m2) 6897 6220 5550 4878 6750 8497 7254 11167 最小輝度 (Cd/m2) 6604 5950 5120 1873 4200 1 6198 1___ 4940 9428 最大輝度 (Cd/m2) 7094 6320 6020 14489 11600 | 12382 10583 12529 使用薄膜 實施例1 實施例5 實施例8 無光擴散薄膜 比較例7 比較例16 比較例17 | δ 5 ^ ^ ^ 5 實施例21 實施例22 實施例23 比較例19 比較例20 比較例21 比較例22 比較例23 —寸 z, _ 201106021 〔產業上之利用可能性〕 本發明之異向性光擴散薄膜及其積層薄片，由於具有 特優的光之透射度與擴散度、且可將光集光於特定方向而 加以擴散之所謂的異向性光擴散功能，可將LED光源之強 烈的直進性之點狀光轉換成線狀光，因此，在例如需要線 狀之照明時，即使減少LED光源之數目也可達成均勻的照 明。 此外，在用作爲廣告媒體或照明等之光源的情況，也 具有可提高裝飾性或裝飾照明性之特徵。 並且，由於直進光之透射率爲小，在用作爲使用LED 光源之照明裝置用時，則可使得未能觀看到強光之光源光 點後，又抑制其光線透射率之降低程度，因此可賦予均勻 的異向性光擴散性。 此外，本發明之使用LED光源之照明裝置用異向性光 擴散薄膜積層薄片是可在維持如上所述光學特性下，又可 提高例如耐熱性或強度等非光學特性。 此外，本發明之異向性光擴散薄膜由於具有異向性光 擴散功能、且具有比先前習知的異向性光擴散薄膜爲高的 擴散性，在用作爲導光板方式之顯示器之擴散薄膜時，則 具有輝度提高功效爲大之特徵。 因此’可有效地使用於室內之照明、內照式裝飾照明 面板之照明、影印機之光照射或液晶顯示器等顯示裝置之 照明等之各種照明。 此外’本發明之異向性光擴散薄膜及使用其之積層薄 -75- 201106021 片’若用作爲背光裝置之光學構件時，則以使用一片之薄 膜或積層薄片，也可賦予高輝度、輝度之角度相依性減少 、面內輝度均質性及圖案遮蔽性等之作爲背光裝置用之光 學構件所應具備必要的光學特性，因此可提高背光裝置之 經濟效益性。特別是可不必使用價昂的透鏡薄膜，且可賦 予例如在使用該透鏡薄膜時，可解決從斜向觀看時輝度會 降低之技術問題的大優點。 此外，本發明之背光裝置是具有接近使用透鏡薄膜的 背光裝置之高正面輝度、且可減少構成使用透鏡薄膜之背 光裝置之技術問題的輝度之角度相依性，因此在使用於例 如大型TV時，具有可抑制由斜方向觀看時之畫面明亮度 降低的優點。 此外，由於具有該特徵，因此可用於例如衛星導航系 统從斜向觀看機會較多的顯示器之背光裝置。 此外’用作爲室內或公司內照明用燈具之背光裝置時 ，則具有可獲得比在使用透鏡薄膜之背光裝置的情況爲更 廣闊範圍之均勻照度的優點。 並且’本發明之背光裝置是以使用一片之構件即可賦 予如上所述之全部特性，因此具有顯著高的經濟效益性的 優點。 因此’本發明之背光裝置是可有效地使用於液晶顯示 裝置、室內之照明、內照式裝飾照明面板等。 此外’根據本發明之異向性光擴散薄膜之製造方法， 則可具有經濟效益性且穩定地製造具有如上所述特性之本 •76- 201106021 發明之異向性光擴散薄膜。因此，對於產業界之貢獻大。 【圖式簡單說明】 第1圖是擴散度計算方法之輔助圖。 第2圖是反曲度計算方法之輔助圖。 【主要元件符號說明】 H0 :使用自動變角光度計，以光線入射角爲0°測定，所 獲得透射光之變角光度曲線在角度爲0度之高度。 H60 :使用自動變角光度計，以光線入射角爲60。測定，所 獲得透射光之變角光度曲線在角度爲0度之高度。 -77-In the transmission measurement mode, the angle of incidence of light: 〇 ° (for the sample surface up and down, the right and left angles are right angles), the angle of acceptance: a 90 ° to 90 ° (angle on the equatorial line), filter: use ND10 , beam aperture: 10.5 mm (VS-13.0), light-receiving aperture: 9.1 mm (VS-3 4.0) and variable angular separation of 0.1 degrees, and change the setting of SENSITIVITY or HIGH -48-201106021 VO LTON to transmit The peak of the light wave is measured as 40 to 90% of the graph. The variable angle luminosity curve of the obtained transmitted light was measured at a height (H0) of an angle of 0 degrees. It is measured that the angle of change of the transmitted light is measured at the height of the angle (H60), except that the incident angle of the light is changed to 60° (the angle on the equatorial plane), and the other is measured under the same conditions as described above. ). Using H60 and H0 measured by this method, and calculating the degree of recursion by the following formula (see Fig. 2), the degree of refraction of light = H60/H0xl00 (%) (1) In addition, the receiver will be moved The face is defined as the equatorial plane. The degree of refraction of the light is obtained by measuring in the main diffusion direction. When there is a difference in the surface roughness of the light-diffusing film, the measurement as described above is carried out by fixing the direction in which the light is actually used. <Light resistance> Using a accelerated weathering tester (manufactured by Suga Test Instruments Co., Ltd., S 3 00), the illuminance of the sample surface was 78 W/m2, and the wavelength range was 30,000. The color difference was evaluated after exposure to 400 nm, continuous irradiation, and rain (12 minutes in 60 minutes) after exposure to an atmosphere of 63 ° C x 50% RH for 400 hours. <Average surface roughness ratio> The universal surface shape measuring instrument MODEL SE-3C manufactured by Kosaka Laboratory Ltd. was used, and the vertical magnification: 2000 to 10000, cutoff: 0.25 The measurement was carried out under the conditions of mm, measuring length: 8 mm, and measuring speed: 0.5 mm/min. -49- 201106021 The surface roughness of the ratio of RaV to RaH of the respective average surface roughness obtained by measuring the winding direction of the light-diffusing film and the average surface roughness in the direction orthogonal to the direction is measured as described above. The ratio is expressed as RaV/RaH. The assays were performed five times each and used for their average enthalpy. <Melting Flow Rate of Thermoplastic Resin> The measurement was carried out at 23 ° C and 2.16 kgf according to the criteria of JIS K 7210 A. A portion of the resin was measured under the conditions disclosed in the examples. <Refractive Index> The refractive index of the resin is determined according to the Becker line method (JIS K7142B method) ISO 489, and the sodium-d line is measured by an Abbe refractometer. <Evaluation of Light Diffusivity When Using Illumination Device Using LED Light Source> Fluorescent Lamp Type LED Lighting Using Transparent Cover Size of 40 W Natural White Light, manufactured by MoMo Alliance Co., Ltd. Lamp (MLT-4 0KC), a light-diffusing film or a light-diffusing film laminated sheet is attached to the surface of the transparent cover, and then a digital camera (KONIC A 1^11^01^8 manufactured by KONIC A 1^11^01^8) ^8 08 8 700) Photographs of the photographic lighting section, and the performance was evaluated on the basis of the following criteria. This evaluation is performed in a state in which the main diffusion direction is parallel to the long axis direction of the fluorescent lamp type LED illumination lamp. (1) Anisotropy The following determination was made with the photograph as described above. 〇: 30% to 50% of the tubes outside the fluorescent-type LED illuminator are visible. X: More than 50% of the tubes outside the fluorescent-type LED lighting are bright. (2) The brightness is based on the brightness of the anisotropic light-diffusing film obtained in Example 1, and is brighter than the brightness: ◎, the same degree of brightness is: 〇, the brightness is poor It is: X to indicate. Brightness is judged by the whiteness of the photo. (3) The disappearance of the spot is judged by the photo as described above: ◎: The spot of the light source is not observed; 〇: The spot of the light source is slightly observed; △: The spot of the light source can be clearly seen; X : The spot of the light source is brighter. [Example 1] 35 parts by mass of a norbornene-ethylene copolymer cyclic polyolefin resin (TOPAS (trade name) 6013S-04, Topas Advanced Polymers, Inc., melt flow rate: 2.0 (230 °) C), refractive index: 1.53) and 65 parts by mass of a block copolymer resin composed of ethylene and octene (INFUSE (trade name) D9817.15 manufactured by The Dow Chemical Co., Ltd., melt flow rate: 26 (230°) C), refractive index: 1.49), melt-mixed with a PCM45 extruder manufactured by Ikegai Corp. at -50-201106021 at a resin temperature of 250 ° C, and extruded from a T-die Then, it was cooled by a mirror cooling roll to obtain an anisotropic light-diffusing film having a thickness of 400 μm. When the cooling is applied, the adhesion of the film to the cooling rolls is carried out using a vacuum chamber. The characteristics of the obtained anisotropic light-diffusing film are shown in Table 1. The anisotropic light-diffusing film obtained in the present embodiment is excellent in the anisotropy of light diffusion. Further, since the brightness is bright and has excellent spot disappearance, it is a high quality as an anisotropic light-diffusing film. Further, since the color difference according to the light resistance test was 1.0, it also had excellent light resistance. [Example 2] In the method of the first embodiment, a cyclic polyolefin resin (TOPAS (trade name) 6015S-04, Topas Advanced Polymers, Inc. manufactured, melt flow) was added in an amount of 50 parts by mass in addition to the blending of the resin. Rate: 0.41 (230 ° C), refractive index: 1.53) and 50 parts by mass of a block copolymer resin composed of ethylene and octene (INFUSE (trade name) D9 101.15, manufactured by The Dow Chemical Co., Ltd., melt flow rate An anisotropic light-diffusing film was obtained in the same manner as in Example 1 except that the film thickness was changed to 200 μm except that the thickness of the film was changed to 200 μm. The characteristics of the obtained anisotropic light-diffusing film are shown in Table 1. The anisotropic light-diffusing film obtained in the present example has a light spot disappearance which is inferior to that of the anisotropic light-diffusing film obtained in Example 1, but the anisotropy or brightness of light diffusion is compared with the embodiment. Since the anisotropic light-diffusing film obtained is more excellent, it is a high-quality one which is an anisotropic light-diffusion film. -52- 201106021 In addition, the color difference according to the light resistance test is ι·〇, so it also has excellent light resistance. [Example 3] In the method of Example 2, a light-diffusing film was obtained in the same manner as in Example 2 except that the film thickness was set to 150 μm. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in the present embodiment has a brightness which is slightly inferior to that of the light-diffusing film obtained in the first embodiment, but is excellent in brightness. Therefore, it is a high-quality as an anisotropic light-diffusing film. Further, since the color difference according to the light resistance test was 1.0, it also had excellent light resistance. [Example 4] In the method of the first embodiment, the cyclic polyolefin resin (TOPAS (trade name) 5013 S-04, Topas Advanced Polymers, Inc., manufactured and melted, except for the blending of the resin, was changed to 50 parts by mass. Flow rate: 8.7 (230 ° C)) 50 parts by mass of a block copolymer resin composed of ethylene and octene (IN FUSE (trade name) D9817.15, manufactured by The Dow Chemical Co., Ltd., melt flow rate: 26 An anisotropic light-diffusing film was obtained in the same manner as in Example 1 except that the film thickness was changed to 200 μm. The characteristics of the obtained anisotropic light-diffusing film are shown in Table 1. The anisotropic light-diffusing film obtained in the present embodiment has characteristics equivalent to those of the anisotropic light-diffusing film obtained in Example 2, and therefore it is considered to be of high quality as an anisotropic light-diffusing film. Further, since the color difference according to the light resistance test was 1.0, it also had the light resistance of the excellent -53-201106021. [Example 5] In the method of the first embodiment, the cyclic polyolefin resin (TOPAS (trade name) 6015S-04' Topas Advanced Polymers, Inc. manufactured by Melas Flow was changed to 50 parts by mass in addition to the blending of the resin. Rate: 0.41 (230 ° C)) and 50 parts by mass of a random copolymer resin composed of ethylene and octene (ENGAGE (trade name) 8137 manufactured by The Dow Chemical Co., Ltd., melt flow rate: 30 (190 ° C) The refractive index was 1.52), and the film thickness was changed to 200 μm, and the anisotropic light-diffusing film was obtained in the same manner as in Example 1. The characteristics of the obtained anisotropic light-diffusing film are shown in Table 1. The anisotropic light-diffusing film obtained in the present embodiment has characteristics equivalent to those of the anisotropic light-diffusing film obtained in Example 2, and therefore it is considered to be of high quality as an anisotropic light-diffusing film. Further, since the color difference according to the light resistance test was 1.0, it also had excellent light resistance. [Example 6] 85 parts by mass of polyethylene terephthalate resin which was dried by a vacuum dryer at 18 (TC for 3 hours to sufficiently remove moisture and was substantially free of lubricant) (Very viscosity: 0.62 (phenol/tetrachloroethane = 60/40) and 15 parts by mass of a mixture of low density polyethylene resin (SP 1 540) manufactured by Prime Polymer Co., Ltd., fed in uniaxial extrusion In the machine, after 28 (TC is melted and removed by a filter, a gear pump to remove foreign matter, and the amount of extrusion is uniformized, it is extruded from a T-die in a sheet form to a controlled temperature of 25 ° C - 54 - 201106021 On the drum. At this time, static electricity is applied to the cooling drum using a linear electrode with a diameter of 0.1 mm to obtain an unstretched film. Secondly, it is carried out at a temperature of 103 °C toward the long axis. The long axis direction was extended by 5.0 times to obtain an anisotropic light-diffusing film having a thickness of 150 μm. The characteristics of the obtained anisotropic light-diffusing film are shown in Table 1. The anisotropic light-diffusing film obtained in the present example was It is of high quality. However, the color difference according to the light resistance test is 3.7, light resistance. It is slightly inferior to those obtained by the anisotropic light-diffusing films obtained in Examples 1 to 5. [Example 7] In the method of Example 6, except that the low-density polyethylene resin was changed to a modified polypropylene resin (Dai Rijing) Color and Chemical Manufacturing Co., Ltd. (CAP3 50) manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd., and changing the film thickness to 200 μm, the others were obtained in the same manner as in Example 6. A directional light-diffusing film. The characteristics of the obtained anisotropic light-diffusing film are shown in Table 1. The anisotropic light-diffusing film obtained in the present example has the same performance as the anisotropic diffusion film obtained in Example 6. [Example 8] 50 parts by mass of a fluorine-based resin (KYNAR 720 (PVDF), manufactured by Arkema Co., Ltd., melt flow rate: 10 (230 ° C, 5 kgf)) and 50 masses Polymethylpentene resin (TPX (trade name) DX820, manufactured by Mitsui Chemicals Co., Ltd., melt flow rate: 110 (260 °C, 5 kgf), refractive index: 1.46 (literature)), using Chiba PCM45 extruder manufactured by Iron Works' It was melt-mixed at 25 (TC resin temperature), and extruded from a -55-201106021 T-die, and cooled by a mirror-finished cooling roll to obtain an anisotropic light-diffusing film having a thickness of 22 5 μm. At the time of cooling, the adhesion of the film to the cooling roll was carried out using an air knife. Further, a corona treatment was applied to one side. The characteristics of the obtained anisotropic light-diffusing film are shown in Table 1. The anisotropic light-diffusing film obtained in the present embodiment is an anisotropic light-diffusing film which is of high quality. Further, since the color difference according to the light resistance test was 0.9, it also had excellent light resistance. [Example 9] 50 parts by mass of a fluorine-based resin (KYNAR 720 (PVDF), manufactured by Arkema Co., Ltd., melt flow rate: 10 (230 ° C, 5 kgf)) and 50 parts by mass of a cyclic polyolefin resin ( TOPAS (trade name) 6013S-04, manufactured by Topas Advanced Polymers, Inc., melt flow rate: 2.1 (230 °C, 2.16 kgf)), using PCM45 extruder manufactured by Chiba Iron Works Co., Ltd. at 250 °C The mixture was melt-mixed at a resin temperature, extruded from a T-die, and cooled by a mirror-finished cooling roll to obtain an anisotropic light-diffusing film having a thickness of 70 μm. When this cooling is applied, the adhesion of the film to the cooling rolls is carried out using a vacuum chamber. In addition, corona treatment is applied on one side. The characteristics of the obtained anisotropic light-diffusing film are shown in Table 1. The anisotropic light-diffusing film obtained in the present embodiment is an anisotropic light-diffusing film which is of high quality. Further, since the color difference according to the light resistance test was 1.0, it also had excellent light resistance. -56-201106021 [Comparative Example 1] In the first embodiment, in addition to changing to a cooling roll to which a pear skin surface was applied, and changing it to a pressure roller using a mirror surface, it was pressed against a cooling roll to be cooled, and the rest was The characteristics of the light-diffusing film obtained in the same manner as in Example 1 were as shown in Table 1. The light-diffusing film obtained in this comparative example has poor anisotropy of light diffusion, and therefore it is a low-quality as an anisotropic light-diffusing film. [Comparative Example 2] 35 parts by mass of a cyclic polyolefin resin (TOPAS (trade name) 6015S-04, manufactured by Topas Advanced Polymers, Inc., melt flow rate: 0.41 (230 ° C)) and 65 parts by mass Block copolymerized resin composed of ethylene and octene (INFUSE (trade name) D9 8 07.1 5 manufactured by The Dow Chemical Company, melt flow rate: 29 (23 0 ° C)), manufactured by Chiba Iron Works Co., Ltd. The PCM45 extruder was melt-mixed at a resin temperature of 250 ° C, extruded from a T-die, and cooled by a mirror-finished cooling roll to obtain a light-diffusing film having a thickness of 300 μm. When this cooling is applied, the adhesion of the film to the cooling rolls is carried out using a vacuum chamber. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in this comparative example has poor anisotropy of light diffusion, and therefore it is a low-quality as an anisotropic light-diffusing film. [Comparative Example 3] 53 parts by mass of a polypropylene resin (manufactured by Sumitomo Chemical Co., Ltd., Sumitomo NOBRENEFS 20 11DG3) and 47 parts by mass of an ethylene-butylene copolymer (manufactured by Mitsui Chemicals Co., Ltd., TAFMER A1085S) were placed at - 57- 201106021 60mm (p single-axis extruder (L/D: 22), melt-mixed at a resin temperature of 240 ° C, and extruded from the T-die after casting at 20 ° C ( Casting r〇11) is cooled to obtain an unstretched sheet. Then, the unstretched sheet is extended by 4.5 times with a roll peripheral speed difference of a longitudinal stretching machine at an elongation temperature of 1 18 ° C, and then, A single-surface corona treatment was applied to obtain a light-diffusing film having a thickness of 200 μm. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusion film obtained in this comparative example was light spot disappearance and diffusivity. Poor, therefore, it is a low quality as an anisotropic light-diffusing film. [Comparative Example 4] 95 parts by mass was dried at 180 ° C for 3 hours by a vacuum dryer to sufficiently remove water and substantially Lubricated polyethylene terephthalate A mixture of a resin (limit viscosity: 0.62) and 5 parts by mass of a low-density polyethylene resin (SP 1 540) manufactured by Prime Polymer Co., Ltd. was fed in a uniaxial extruder and melted at 280 ° C. The foreign matter is removed by a filter and a gear pump, and the amount of extrusion is uniformized, and then extruded from a T-die in a sheet form onto a cooling drum having a controlled temperature of 25 ° C. At this time, the diameter is used. Applying static electricity to the 0.1 mm linear electrode to adhere to the cooling drum to obtain an unstretched film. Secondly, it is extended 3.0 times in the long axis direction at a temperature of 103 ° C in the long axis direction to obtain a thickness of 75 μm. The light-diffusing film of the obtained light-diffusing film is shown in Table 1. The light-diffusion film obtained in this comparative example is inferior to the light-diffusion film obtained in Comparative Example 2, and thus has poor spot disappearance and diffusibility. As an anisotropic-58-201106021 light-diffusing film is a low-quality one. [Comparative Example 5] A highly transparent polyester film having a thickness of 250 μm (Cosmoshine manufactured by Toyobo Co., Ltd.) On the single side of Α4300) 50 parts by mass of true spherical acrylic resin particles having an average particle diameter of 3 μm (TAFT 1C (trade name) FH-S 3 00 manufactured by Toyobo Co., Ltd.) and 50 parts by mass of polyurethane The mixture of the resins was coated with a coater and dried to have a thickness of 25 μm after drying to obtain a light-diffusing film. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in this comparative example was light-diffusing. Since the anisotropy is poor, it is a low-quality one as an anisotropic light-diffusing film. [Comparative Example 6] A flaky cerium oxide particle (AGC) having a thickness of a nanometer-sized particle on a single surface of a highly transparent polyester film (Cosmoshine A4300 manufactured by Toyobo Co., Ltd.) having a thickness of 205 μm SUN LOVELY (trade name) LFS HN 050 manufactured by Si-Tech Co., Ltd., coated and dried using a coater without blending the binder resin to a thickness of 30 μm after drying. To obtain a light diffusing film. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in this comparative example is inferior in light diffusion, has low total light transmittance, and is inferior in brightness. Therefore, it is a low-quality optical diffusing film. [Comparative Example 7] -59- 201106021 The characteristics of a light-diffusing film composed of a surface-embossed polycarbonate resin were evaluated. The results are shown in Table 1. The light-diffusing film obtained in the comparative example has low light diffusivity, low parallel light transmittance, and poor spread of light spot disappearance or brightness. Therefore, it is low as an anisotropic light-diffusing film. quality. Further, the chromatic aberration change is as high as 9.5, and thus the light resistance is poor. [Comparative Example 8] A light-diffusing film was obtained in the same manner as in Example 6 except that the stretching ratio was changed to 1.5 times and the thickness of the obtained film was changed to 25 μm. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in the comparative example was excellent in brightness, but the parallel light transmittance was 髙 and the haze was low, so that the spot disappearance was poor. Further, since the anisotropy is also poor, it is a low-quality one as an anisotropic light-diffusing film. [Comparative Example 9] In the method of Example 6, except that the thickness of the obtained film was changed to 200 μm, the light-diffusing film was obtained in the same manner as in Example 6. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in this comparative example is excellent in anisotropy or light-dip-loss property, but has poor brightness. Therefore, it is a low-quality film which is an anisotropic light-diffusing film. -60-201106021 [Comparative Example 1 〇] In the method of Example 7, except that the stretching ratio was changed to 1.5 times and the thickness of the obtained film was 25 μm, the light was obtained in the same manner as in Example 6. Diffusion film. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in the comparative example was excellent in brightness, but the light transmittance was poor because the parallel light transmittance was high and the haze was low. Further, since the anisotropy is also poor, it is a low-quality one as an anisotropic light-diffusing film. [Comparative Example 1 1] In the method of Example 7, except that the thickness of the obtained film was changed to 300 μm, the light-diffusing film was obtained in the same manner as in Example 6. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in the comparative example is excellent in anisotropy or light spot loss, but has poor brightness. Therefore, it is a low-quality one which is an anisotropic light-diffusing film. [Comparative Example 1 2] In the method of Example 8, except that the thickness of the obtained film was changed to _ 3 5 Ο μηη, a light-diffusing film was obtained in the same manner as in Example 6. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in this comparative example is excellent in anisotropy or light spot loss, but has poor brightness. Therefore, it is a low-quality film which is an isotropic light-diffusing thin film -61 - 201106021. [Comparative Example 1 3] In the method of Example 9, except that the thickness of the obtained film was changed to 1 2 5 μm, the light-diffusing film was obtained in the same manner as in Example 6. The characteristics of the obtained light-diffusing film are shown in Table 1. The light-diffusing film obtained in the comparative example is excellent in anisotropy or light spot loss, but has poor brightness. Therefore, it is a low-quality one which is an anisotropic light-diffusing film. [Example 1] An anisotropic light-diffusing film obtained by Examples 1 to 9 and a transparent polyester film having a thickness of 250 μm and a total light transmittance of 92% (Cosmoshine manufactured by Toyobo Co., Ltd.) Α 4300) is bonded with an optical double-sided adhesive sheet to obtain an anisotropic light-diffusing film laminate sheet. As a result, any of the laminated sheets has the same optical characteristics as the respective anisotropic light-diffusing films, and the light-diffusing material for use as an illumination device using an LED light source is of a high quality. Further, the obtained anisotropic light-diffusing film laminated sheet has higher non-optical properties such as heat resistance and strength than the anisotropic light-diffusing film obtained in Examples 1 to 9 [Example 1 1] The anisotropic light-diffusing film obtained by the methods of Examples 1 to 9, in the methods of Examples 1 to 9, when the cooling as described above is carried out, the adhesion of the film to the cooling roll is changed to the pressure roller method. A polyurethane-based adhesive is used on the press roll side, and the tackified coating agent is passed through a surface of a polycarbonate sheet having a thickness of 200 μm and a total light transmittance of 88%. 'To obtain an anisotropic light-diffusing film laminate sheet of a laminated polycarbonate sheet. Further, at this time, the extrusion amount and the extrusion pressure were adjusted so as not to cause a liquid accumulation zone. The anisotropic light-diffusing film laminated sheet obtained in the present embodiment has the same optical characteristics as the anisotropic light-diffusing film obtained in Examples 1 to 9, and the light-diffusing material used as the illumination device using the LED light source belongs to High quality. Further, non-optical properties such as heat resistance or strength are higher than those of the light-diffusing films obtained in Examples 1 to 9. [Example 1 2] A 40 W natural white light transparent cover type fluorescent lamp type LED illumination lamp (MLT-40KC) manufactured by MoMo Alliance was used, and the surface of the transparent cover was attached with optical double-sided tape. The anisotropic light-diffusing film obtained in Examples 1 to 9 is such that the main diffusion direction is orthogonal to the long-axis direction of the fluorescent lamp type LED illumination lamp. The result is that the light of the spot-shaped LED light source becomes a small linear shape. Light. [Example 1 3] In Example 12, the anisotropic light-diffusing film was attached to the optical double-sided tape so that the main diffusion direction was parallel to the long-axis direction of the fluorescent lamp type LED illumination lamp. As a result, the light of the point-like LED light source can be seen to be cut into a fine circular shape in a direction orthogonal to the long axis direction of the fluorescent lamp to emit light. [Comparative Example 14] The light-diffusing film obtained by Comparative Examples 1 to 13 was used in the same manner as in the practice of -63-201106021 Example 12 or 13. As a result, in all of the light-diffusing films obtained in any of the comparative examples, at least one of the characteristics of the anisotropy, the disappearance of the spot, and the brightness was inferior. For example, if the film having a low anisotropy is attached, the light diffusion film is attached such that the film winding direction is parallel or orthogonal to the long axis direction of the fluorescent lamp type LED illumination lamp, but is attached in any direction. The light is still diffuse in an isotropic manner and cannot illuminate in a particular direction of light collection. In addition, the light spot disappearance is a poor film, and the strong light of the LED light source remains at the light source position, resulting in poor uniformity of brightness. In addition, films with poor brightness result in insufficient brightness. [Example 1 4] 35 parts by mass of a cyclic polyolefin resin (TOPAS (trade name) 6013S-04, Topas Advanced Polymers, Inc.) was produced and melted in a first extruder using two melt extruders. Flow rate: 2.0 (230 ° C, 2.16 kgf)) and 65 parts by mass of a block copolymer resin composed of ethylene and octene (INFUSE (trade name) D9817.15, manufactured by The Dow Chemical Co., Ltd., melt flow rate :26 (23 0 °C, 2.16 kgf)) as a light-diffusing layer, and a second extruder to make a polypropylene-based adhesive resin (ADMER (trade name) QF551, manufactured by Mitsui Chemicals Co., Ltd., melted Flow rate: 5.7 (190 °C, 2.16 kgf)) is a two-layer (heat-tight layer) method, which is melt-co-extruded in a T-die manner and then cooled by a mirror-shaped cooling roll. An anisotropic light-diffusing film having a thickness of 400 μm on both sides of a laminated heat-bonding layer. The thickness of the thermal bonding layer is set to 40 μm on both sides. When the cooling as described above was carried out, the adhesion of the film to the cooling rolls was carried out in the same manner as in Example 1. As a result, even if the film was continuously formed over a long period of time, the eyelids were not observed from -64 to 201106021. The characteristics of the anisotropic light-diffusing film obtained in this embodiment are as follows! The anisotropic light-diffusing film obtained by the method has the same optical characteristics as that of the first embodiment and has excellent thermal adhesion. Therefore, the anisotropic light-diffusing film can be improved by heat on the substrate. Dimensional stability. In addition, thermal adhesion and dimensional stability were evaluated in the following manner, and any of them was 〇. On the other hand, when it is carried out by the method of the first embodiment, when the film is continuously formed for a long period of time, eyelids may occur. <Heat Adhesive> A surface having a thickness of 3 mm on a fixing table of a hot press is a smooth and transparent acrylic plate (manufactured by Mitsubishi Rayon Co., Ltd.): ACRYLITE), and the sample is placed on the acrylic plate, and a polyxylene rubber sheet having a thickness of 3 mm (hardness HsA50°) is placed thereon, and then the surface temperature is set at 180 ° C. The head was pressed over the sheet of polyoxyethylene rubber and pressurized at a pressure of 49 N/cm 2 for 30 seconds. After heating and pressing, it was naturally cooled for 30 minutes in an environment of a temperature of 2 31 and a relative humidity of 65%, and then "TENSILON" (UTM-IIIL) manufactured by Toyo Seiki Co., Ltd. was used. The resistance at the time of peeling off 180 degrees at a speed of 300 mm/min is used as the adhesion. The determination of the adhesion is carried out on the following basis: 〇: The adhesion is 〇.1 N/1 5 mm or more; -65- 201106021 X: The adhesion is less than 0.1 N/15 mm. <Dimensional Stability> The sample obtained by heat-following the anisotropic light-diffusing film on an acrylic plate was placed in an oven adjusted to 80 ° C according to the thermal adhesion evaluation method as described above. After 240 hours of warming treatment, the dimensions of the anisotropic light-diffusing film in the longitudinal and transverse directions were measured, and then compared with the respective dimensions before the warming treatment, and judged by the following criteria: 〇: size due to warming treatment The change is less than 0 _ 1 % in any direction; X: When at least one of the dimensional changes of the warming treatment is 0.1% or more. [Example 1 5] In the method of Example 14, except that the resin extruded from the second extruder was made of a polypropylene-based adhesive resin (ADMER (trade name) QF551, Mitsui Chemicals Co., Ltd., The melt flow rate: 5.7 (190 ° C) was changed to polypropylene resin FS20UDG3 (manufactured by Sumitomo Chemical Co., Ltd., Sumitomo NOBRENE (trade name)), and the other method was used to obtain anisotropic light diffusion in the same manner as in Example 14. film. The characteristics of the anisotropic light-diffusing film obtained in this example are shown in Table 1. The obtained anisotropic light-diffusing film has excellent light-diffusing properties, and no eyelids are observed even after continuous film formation for a long period of time. However, the heat was then inferior to that of the anisotropic light-diffusing film obtained in Example 14. [Example 1 6 to 20] -66-201106021 An anisotropic light-diffusing film obtained by each of Examples 1, 2, 5, 6, and 8 was used, and was measured for liquid crystal display device by the method described below. The front luminance, the luminance angle dependence, and the pattern shielding property when the backlight device is used. The results are shown in Table 2. The anisotropic light-diffusing film obtained in any of the examples has excellent optical characteristics as disclosed in the respective embodiments, and the positive luminance of an anisotropic light-diffusing film is used because the light has a high degree of recursion. High, and the degree of dependence of the luminance is small, and the excellent pattern shielding property is provided. Therefore, the luminance improving member of the backlight device for a liquid crystal display device is a high quality 〇 <Front luminance when used in a backlight device for a liquid crystal display device> A 19-inch light guide plate type in which three cold cathode tubes are provided on both sides of the long diameter side (lateral direction) (using a white reflective film and a mesh) Type) The evaluation part of the 40 mm x 60 mm square (the horizontal side of the 60 mm side) is placed at the center of the acryl plate on the light exit side of the backlight unit (simple stacking setting, if the sample is curled, etc.) When floating, fix the four corners with tape.), and set 30 mm> <50 mm square (the lateral direction of the 50 mm side) The part of the opaque paper is cut so that the center of the cut portion is located at the center of the evaluation sample, and then the luminance is measured in the dark room. The black shading paper is selected to cover the entire size of the backlight unit and is fixed so that the light does not leak out. Further, the backlight unit is measured while being set to a level. The luminance is a TOPCON spectroradiometer SR-3A manufactured by Topcon Technohouse Corporation, and the distance from the surface of the backlight unit is -67 to 201106021 40 cm at a measurement angle of 2 degrees, and the evaluation test is performed. The center of the sample was measured at a position directly below. In the present measurement, the sample for evaluation was set such that the main diffusion direction was orthogonal to the long axis direction of the cold cathode tube. <Angle dependence of luminance when used in a backlight device for a liquid crystal display device> In addition to setting the TOPCON spectroradiometer SR-3A such that the angle between the TOPCON spectroradiometer SR-3A and the center of the sample for evaluation is The luminance is measured in the same manner as the front luminance described above except that the vertical line of the surface of the backlight unit is inclined by 35 degrees. The enthalpy obtained by dividing the luminance by the front luminance as described above is used as the angle dependence of the luminance. The greater the enthalpy, the more excellent the angular dependence of the brightness, and the best is 1.0. <Pattern shielding property when used in a backlight device for a liquid crystal display device> The opening portion of the front luminance measurement as described above was visually observed in a state of backlighting, and the following determination was made. 〇: The condition of the mesh of the light guide plate is not observed at all; △: The condition of the mesh of the light guide plate is slightly observed; X : The condition of the mesh of the light guide plate can be clearly seen. [Comparative Example 1 4 and 15] The light-diffusion film obtained in each of Comparative Examples 3 and 7 was used, and the front luminance used in the backlight device for a liquid crystal display device was measured in the same manner as in Examples 16 to 20. , angle dependence of brightness and pattern shielding. The results are shown in Table 2. -68-201106021 The light-diffusing film obtained in this comparative example was inferior in pattern shielding property. [Comparative Example 1 6] Using the commercially available microlens film, the front luminance, the luminance angle dependency, and the pattern shielding property when used in a backlight device for a liquid crystal display device were measured in the same manner as in Examples 16 to 20. The results are shown in Table 2. Although the front lens has a high luminance, the angle dependence of the luminance is poor. Further, when only one of the microlenses is used, the pattern shielding property is also poor. [Comparative Example 1 7] A light-diffusing film manufactured by a bead coating method using a commercially available backlight device was used, and a backlight device for a liquid crystal display device was measured in the same manner as in Examples 16 to 20. The positive luminance, the angle dependence of the luminance, and the pattern shielding property. The results are shown in Table 2. When only one sheet is used for the light-diffusing film, the angle dependence of the luminance and the pattern shielding property are inferior. [Comparative Example 1 8] An optical film group composed of an upper diffusion film/稜鏡 lens film/lower diffusion film equipped with a backlight unit used for measuring the angle dependence of front luminance and luminance was used and Example 1 In the same manner as in the case of 6 to 20, the front luminance, the luminance angle dependency, and the pattern shielding property when used in a backlight device for a liquid crystal display device were measured. The results are shown in Table 2. Although the film group is excellent in front luminance or pattern shielding, the angle dependence of luminance is poor. In addition, due to the large number of pieces, the economic efficiency is poor. -69-201106021 [Example 2 1 to 2 3] For the anisotropic light-diffusing film obtained by Examples 1, 5 and 8, the in-plane for use in a backlight device for a liquid crystal display device was measured by the following method Brightness homogeneity. The results are shown in Table 3. The anisotropic light-diffusing film obtained in any of the examples has a high average luminance and a high in-plane luminance uniformity. Therefore, the light-diffusing film used as a backlight device is of high quality. <In-plane luminance homogeneity when used in a backlight device for a liquid crystal display device> The light-diffusing acrylic plate of a direct-lit backlight unit of 20 inches and equipped with 12 cold cathode tubes is changed into a transparent acrylic plate, and A sample of A-4 size was placed in the center of the transparent acrylic plate, and the four corners were fixed with tape, and then the high-performance luminance and colorimetric measurement system (RISA) manufactured by HI-LAND was used to make a point in the dark room. In the state of the lamp backlight unit, the luminance of the pixel area of the sample center portion 100x220 is measured. The luminance is the maximum luminance, the minimum luminance, and the average luminance. In-plane luminance homogeneity is expressed as the ratio of the minimum luminance to the maximum luminance measured by the method described above. The smaller the sputum, the smaller the luminance spot. As described above, the cold cathode tube is set such that the long axis direction of the cold cathode tube becomes the long axis direction (lateral direction) of the backlight unit. The luminance measuring device was placed at a position directly above the substantially central portion of the sample*, and the distance between the surface of the transparent acrylic plate and the incident light surface of the luminance meter was set at 120 cm. The backlight unit is set at a level for measurement. In the present measurement, the sample for evaluation is set such that the main diffusion direction thereof is orthogonal to the long axis direction of the cold cathode tube. -70-201106021 [Comparative Example 1 9] Light is not provided The in-plane luminance homogeneity was measured under a diffusion film. The results are shown in Table 3. Although the maximum luminance is clearly high, the in-plane luminance homogeneity is significantly low. Thus, the magnitude of the optical property control effect of the film of the embodiment as described above is clearly shown. [Comparative Examples 20 to 22] In-plane luminance homogenization was measured for each of the light-diffusing films used in Comparative Examples 7, 16, and 17. The results are shown in Table 3. Although either of the diffusing films has a high maximum luminance, the in-plane luminance homogeneity is low. If only one light diffusing film is used, the performance is insufficient. [Comparative Example 2 3] The optical film group composed of the upper diffusion film/稜鏡 lens film/lower diffusion film of the backlight unit used for measuring the in-plane luminance uniformity is used to change the light-diffusing film for the backlight device. The in-plane luminance homogeneity was measured. The results are shown in Table 3. Although the maximum luminance is high, the in-plane luminance homogeneity is poor. In addition, the number of films is large, so the economic efficiency is poor. -71 - 201106021 I <Brightness 〇 ◎ 〇 〇 ◎ 〇 〇 ◎ 〇 〇 〇 X 〇 ◎ ◎ ◎ X ◎ ◎ X ◎ X X X Spot disappearance ◎ 〇 < ◎ 〇 <<< ◎ ◎ ◎ 〇 X X 〇 〇 X X 〇 X ◎ ◎ ◎ Anisotropy <] 〇 〇 〇 〇 〇 〇 〇 〇 < X X 〇 〇 X X X X 〇 X 〇 〇 〇 V0 § rn p— < o <N ro o ro <N <N «〇 <N 卜 oi 00 <N o o Ψ-* 00 ο o ο o »* (N oi o m <N (N (N (N <N (N ^ 耜S wins S o (N w-i Os On <N 00 CO rvj H CN r*^ (N 00 ri o p p o v〇 — ο o ο o <N <N 00 〇 DL2 (degrees) ON v〇 沄 fO v〇 (N *T) g 00 S s 5〇 P o 00 oo o s g <N OO g 〇\ 〇\ 〇(N Ό DH2 (degrees) CN v〇Os (N CN VO ΓΛ 00 o **· 卜o 1·^ rn 00 fS g in 00 On 00 00 ON cs *·« OO _ S ^ X m 〇s^/ Bu <N <N — rn »〇 00 (N <N 00 *τί »〇00 »〇o V··* 00 (N Tis CN (N KTi oo — popm CO 00 00 — yn rn VO wS Q CN 00 (N v-> geisha \ Ό m (N 00 o <N o 00 S DH1 〇\ o Bu ^-H 〇\ «/Ί ΓΛ s 00 V«0 Os Ό (N 00 cn v〇 MM CN 00 <N (N 00 »n o 00 00 On v〇 <N s haze (%) 99.0 »〇'O On 85.0 99.0 1 98.0 II 93.71 1 92.9 | L92^J ! 93.7 I — 97.5” 97.2 99.3 1 I 98.6 J : 22.9 LtmJ 1 95.0 J 95.2 m S 00 .96.5 o JO 00 Os 99.0 94.5 5 ^ ^ f ^ w \〇d 〇rn o 00 00 o <N (N inch · o v〇 r-; — v〇 d (N 69.7 ! 24.5 卜 cn o 00 25.0 <N r^t 22.0 00 o inch d o — total light transmittance (%) v-j 00 v〇 〇0 o ss ro On a\ 〇〇 Os Ό inch o | 74.4 I o ΓΛ 00 <N rn oo 卜 \ό 00 Tf 00 00 ύ p v〇 ro o <N v〇 o 00 00 o <N v〇 1 59.0 I o oo <n |Example i 1 1 Example 2" |Example 3 |Example 4 1Example 5 |Example 6 I |Example 7 I |Example 8 I |Example 9 Example 14 Example 15 Comparative Example i | Comparative Example 2 | Comparative Example 3 Comparative Example 4 | Comparative Example 5 Comparative Example 6 | Comparative Example 7 | Comparative Example 8 | Comparative Example 9 Comparative Example 10 Comparative Example 11 1 Comparative Example 12 Comparative Example 13 -IL_ 201106021 Comparative Example 18 1 1 1 1 1 1 1650 1 750 1 0.45 1 〇 Comparative Example Π 1 (NI 97.5 1640 1320 0.81 0 Comparative Example 16 1 (N 〇 94.4 1770 Γ 1350 0.76 X Comparative Example 15 Comparative Example 7 00 00 〇 80.3 1350 i 1120 0.83 X Comparative Example 14 Comparative Example 3 yr) o 22.9 1210 1 1190 0.98 X Example 20 Example 8 s 00 » n 00 92.5 1405 1 1400 ο 〇 Example 19 | Example 6 1 cn VO 00 卜 | 93.7 | 1380 1 1375 ο 〇 Example 18 | Example 5 | ON u-» r- (N <N <N (S m 98.0 .1400 1 1405 ο 〇 Example 17 | Example 2 1 沄 (N (N - 96.5 1450 丨 1415 0.98 〇 Example 16 Example 1 OS SO » 〇 (N 卜 (N 99.0 1410 Film used for 1410 ρ | | DHO (degrees) | DLO (degrees) I DLO/DHO degree of refraction (%) (H60/H0) 1 haze (%) 1 o but 4 <s 1 Q ttsi >r> Angle dependence of Cl luminance* 1 Spot disappearance _iL_ 201106021 e < In-plane luminance homogeneity (Cd/m2) 0.94 0.94 0.84 0.13 0.36 0.50 0.47 0.75 Average luminance (Cd/m2) 6897 6220 5550 4878 6750 8497 7254 11167 Minimum luminance (Cd/m2) 6604 5950 5120 1873 4200 1 6198 1___ 4940 9428 Maximum Brightness (Cd/m2) 7094 6320 6020 14489 11600 | 12382 10583 12529 Film Application Example 1 Example 5 Example 8 Light-Free Diffusion Film Comparative Example 7 Comparative Example 16 Comparative Example 17 | δ 5 ^ ^ ^ 5 Example 21 Example 22 Example 23 Comparative Example 19 Comparative Example 20 Comparative Example 21 Comparative Example 22 Comparative Example 23 - inch z, _ 201106021 [Industrial Applicability] The anisotropic light-diffusing film of the present invention and its laminated sheet A so-called anisotropic light-diffusing function that has excellent light transmittance and diffusivity and can diffuse light in a specific direction, and can convert the direct directivity of the LED light source into a point-like light. Linear light is generated, and therefore, even when linear illumination is required, uniform illumination can be achieved even if the number of LED light sources is reduced. Further, in the case of use as a light source such as an advertising medium or illumination, it is also characterized in that decorativeness or decorative lighting can be improved. Moreover, since the transmittance of the straight-through light is small, when it is used as an illumination device using an LED light source, the light source spot of the strong light can be prevented from being observed, and the degree of reduction of the light transmittance is suppressed. Gives uniform anisotropic light diffusivity. Further, the anisotropic light-diffusing film laminated sheet for an illumination device using an LED light source of the present invention can improve non-optical characteristics such as heat resistance or strength while maintaining the optical characteristics as described above. Further, the anisotropic light-diffusing film of the present invention has an anisotropic light-diffusing function and has a higher diffusibility than the conventional anisotropic light-diffusing film, and is used as a diffusion film of a display as a light guide plate. At the time, it has the characteristic that the brightness is improved. Therefore, it can be effectively used for illumination of indoors, illumination of an interior-illuminated decorative lighting panel, light irradiation of a photocopier, or illumination of a display device such as a liquid crystal display. Further, the 'anisotropy light-diffusing film of the present invention and the laminated thin film using the same-75-201106021 sheet' can be used as an optical member of a backlight device, and a high-density or luminance can be imparted by using a thin film or a laminated sheet. The optical member for a backlight device, such as reduced angle dependency, in-plane luminance uniformity, and pattern shielding property, should have necessary optical characteristics, so that the economic efficiency of the backlight device can be improved. In particular, it is not necessary to use a lens film which is expensive, and it is possible to solve the technical problem that the luminance is lowered when viewed from an oblique direction, for example, when the lens film is used. Further, the backlight device of the present invention has a high front luminance which is close to a backlight device using a lens film, and can reduce the angle dependence of luminance which constitutes a technical problem of a backlight device using a lens film, and thus, when used in, for example, a large TV, It has the advantage of suppressing a decrease in brightness of a picture when viewed from an oblique direction. Moreover, due to this feature, it can be used, for example, in a satellite navigation system to view a backlight of a display having a greater chance of viewing from an oblique direction. Further, when it is used as a backlight device for indoor or in-house lighting fixtures, there is an advantage that a uniform illumination of a wider range than in the case of a backlight device using a lens film can be obtained. Further, the backlight device of the present invention has the advantage of being able to impart all of the above characteristics by using a member of one sheet, and thus has a remarkable high economic efficiency. Therefore, the backlight device of the present invention can be effectively used for a liquid crystal display device, an indoor illumination, an interior illumination decorative illumination panel, or the like. Further, the manufacturing method of the anisotropic light-diffusing film according to the present invention can economically and stably produce the anisotropic light-diffusing film of the invention of the present invention having the above-described characteristics. 76-201106021. Therefore, the contribution to the industry is great. [Simple description of the drawing] Fig. 1 is an auxiliary diagram of the calculation method of the diffusion degree. Figure 2 is an auxiliary diagram of the calculation method of the degree of recursion. [Description of main component symbols] H0: Using an automatic variable angle photometer, the angle of incidence of the transmitted light is measured at an angle of 0 degrees. H60: Use an automatic variable angle photometer with a light incident angle of 60. The measured angular luminosity curve of the transmitted light was measured at an angle of 0 degree. -77-

Claims (1)

201106021 七、申請專利範圍： 1. —種異向性光擴散薄膜，其特徵爲由至少兩種非相溶性 的熱塑性樹脂之混合物所構成，且同時可符合下列第（1) 至（4)項之特性： (1) 全光線透射率爲66%以上； (2) 霧度爲超過80% ; (3) 平行光線透射率爲低於20% ; (4) 以本說明書中所揭述之方法所測定，且使用變角光度 計以入射角爲 0度所測得透射光之擴散度比 1(0^11/01^1)或擴散度比2(0^12/01^2)中之任一者爲超 過 2.0 ; (其中，DH1及DL1是在以自動變角光度計測定、且將 光擴散薄膜之捲繞方向固定於垂直方向及水平方向來 進行測定，所獲得透射光之變角光度曲線之波峰高度的 一半高度之角度的寬度（半値寬度）中，假設該半値寬度 較大者爲DH1，較小者則爲DL1;此外，DH2及DL2 是在以自動變角光度計測定、且將光擴散薄膜之捲繞方 向固定於垂直方向及水平方向來進行測定，所獲得透射 光之變角光度曲線之波峰上升角度與波峰結束角度之 間的角度之度數中，假設該角度之度數較大者爲DH2， 該角度之度數較小者則爲DL2)。 2. 如申請專利範圍第1項之異向性光擴散薄膜，其中DH2 爲1 1 〇度以上。 3. 如申請專利範圍第1或2項之異向性光擴散薄膜，其中 -78- 201106021 以本說明書中所揭述之方法，且光擴散薄膜之捲繞方向 是@定於試料固定台之上下方向與平行方向及水平方 向5(5¾行測定，所獲得主擴散方向之光的反曲度爲4至 10 0%° 4. 如申請專利範圍第1至3項中任一項之異向性光擴散薄 膜’其中該至少兩種非相溶的熱塑性樹脂之混合物中至 少一種是由聚烯烴系樹脂所構成。 5. 如申請專利範圍第4項之異向性光擴散薄膜，其中該至 少兩種非相溶的熱塑性樹脂之混合物是由兩種以上之 聚烯烴系樹脂所構成。 6. 如申請專利範圍第5項之異向性光擴散薄膜，其中至少 兩種非相溶的熱塑性樹脂之混合物的主成份是環狀聚 烯烴系樹脂與聚乙烯系樹脂之摻合比例爲1 0/90至 90/10之混合物。 7. 如申請專利範圍第5或6項之異向性光擴散薄膜，其係 在該由至少兩種非相溶的熱塑性樹脂之混合物所構成 的光擴散薄膜中至少一面上，積層主要是由聚烯烴系樹 脂所構成的表面層。 8. 如申請專利範圍第7項之光擴散薄膜，其中用於形成該 表面層之聚烯烴系樹脂是由含有極性基之聚烯烴樹脂 所構成。 9. 如申請專利範圍第8項之異向性光擴散薄膜，其中含有 極性基之聚烯烴樹脂是至少含有羧基者。 10.如申請專利範圍第1至4項中任一項之異向性光擴散薄 -79- 201106021 膜，其中該另一種熱塑性樹脂是由氟系樹脂所構成。 11. 如申請專利範圍第1至4項中任一項之異向性光擴散薄 膜，其中該另一種熱塑性樹脂是由聚酯系樹脂所構成。 12. 如申請專利範圍第1 1項之異向性光擴散薄膜，其係朝 —方向加以延伸2倍以上所構成。 13. —種異向性光擴散薄膜積層薄片，其特徵爲由如申請專 利範圍第1至12項中任一項之光擴散薄膜與厚度爲〇.1 至5 mm、全光線透射率爲70至100%之塑膠薄片積層 所構成。 1 4 ·如申請專利範圍第1至1 2項中任一項之異向性光擴散 薄膜，其係使用於配備LED光源之點燈裝置。 I5·如申請專利範圍第13項之異向性光擴散薄膜積層薄片 ’其係使用於配備LED光源之點燈裝置。 1 6.—種使用LED光源之點燈裝置，其特徵爲如申請專利範 圍第1至12項中任一項之異向性光擴散薄膜是安裝於 使用LED光源之照明裝置之出光部的外面或內面。 17. —種使用LED光源之點燈裝置，其特徵爲如申請專利範 圍第13項之異向性光擴散薄膜積層薄片是安裝於使用 LED光源之照明裝置之出光部的外面或內面。 18. —種背光裝置，其特徵爲如申請專利範圍第1至12項 中任一項之異向性光擴散薄膜是設置於背光單元之出 射光面上。 19. 一種背光裝置，其特徵爲如申請專利範圍第13項之異 向性光擴散薄膜積層薄片是設置於背光單元之出射光 -80- 201106021 面上。 20.—種異向性光擴散薄膜之製造方法，用於製造女 利範圍第1至1 2項中任一項之異向性光擴散袭 特徵爲將至少兩種非相溶性的熱塑性樹脂之添 以熔融擠出成型。 2 1 ·如申請專利範圍第20項之異向性光擴散薄膜二 法，其中以擠壓機將熔融樹脂從模頭擠出成薄> 將該薄片以使用氣體壓力之按壓方法及/或吸引 靜電密著法加以密著且加以冷卻固化來製膜。 I申請專 膜，其 合物加 .製造方 •狀，並 法及/或 -81 -201106021 VII. Patent application scope: 1. An anisotropic light-diffusing film characterized by a mixture of at least two incompatible thermoplastic resins and at the same time meeting the following items (1) to (4) Characteristics: (1) The total light transmittance is 66% or more; (2) The haze is more than 80%; (3) The parallel light transmittance is less than 20%; (4) The method disclosed in this specification Measured and measured using a variable angle photometer with a diffusivity ratio of transmitted light of 1 (0^11/01^1) or a diffusivity ratio of 2 (0^12/01^2) at an incident angle of 0 degrees. Either more than 2.0; (wherein DH1 and DL1 are measured by an automatic variable angle photometer, and the winding direction of the light-diffusing film is fixed in the vertical direction and the horizontal direction, and the angle of the transmitted light is obtained. In the width (half width) of the half height of the peak height of the luminosity curve, it is assumed that the larger half width is DH1, and the smaller one is DL1; in addition, DH2 and DL2 are measured by an automatic variable angle photometer. And measuring the winding direction of the light-diffusing film in the vertical direction and the horizontal direction, and measuring The transmission light obtained angle displacement angle in degrees between the peak intensity curve of the angle of elevation and angle of the end of the peak, the larger the degree of the angle assumed by the DH2 is, the smaller the angle of degrees compared DL2). 2. For example, the anisotropic light-diffusing film of claim 1 wherein DH2 is above 11 〇. 3. The anisotropic light-diffusing film of claim 1 or 2, wherein -78-201106021 is in the method described in the present specification, and the winding direction of the light-diffusing film is @定定定固定台The up-and-down direction is parallel to the parallel direction and the horizontal direction 5 (53⁄4 lines), and the refraction of the light obtained in the main diffusion direction is 4 to 10%. 4. The indirection of any one of the claims 1 to 3. The at least one of the mixture of the at least two incompatible thermoplastic resins is composed of a polyolefin-based resin. 5. The anisotropic light-diffusing film of claim 4, wherein the at least one The mixture of two kinds of non-compatible thermoplastic resins is composed of two or more kinds of polyolefin-based resins. 6. The anisotropic light-diffusing film of claim 5, wherein at least two kinds of non-compatible thermoplastic resins The main component of the mixture is a mixture of a cyclic polyolefin resin and a polyethylene resin in a ratio of 10/90 to 90/10. 7. Anisotropic light diffusion according to claim 5 or 6 a film, which is composed of at least two a surface layer mainly composed of a polyolefin-based resin on at least one side of a light-diffusing film composed of a mixture of incompatible thermoplastic resins. 8. A light-diffusing film according to claim 7 of the patent application, wherein The polyolefin-based resin which forms the surface layer is composed of a polyolefin resin containing a polar group. 9. The anisotropic light-diffusing film of claim 8, wherein the polar resin-containing polyolefin resin contains at least a carboxyl group. 10. An anisotropic light-diffusing thin film-79-201106021 film according to any one of claims 1 to 4, wherein the other thermoplastic resin is composed of a fluorine-based resin. The anisotropic light-diffusing film according to any one of items 1 to 4, wherein the other thermoplastic resin is composed of a polyester resin. 12. The anisotropic light-diffusing film according to claim 11 of the patent application, And the light diffusing film of any one of the first to twelfth aspects of the invention is characterized by An anisotropic light-diffusing film having a degree of 〇.1 to 5 mm and a total light transmittance of 70 to 100%. 1 4 · An anisotropic light-diffusing film according to any one of claims 1 to 12. It is used in a lighting device equipped with an LED light source. I5. An anisotropic light-diffusing film laminated sheet according to claim 13 of the patent application is used for a lighting device equipped with an LED light source. A lighting device for a light source, characterized in that the anisotropic light-diffusing film according to any one of claims 1 to 12 is attached to the outer surface or the inner surface of the light-emitting portion of the illumination device using the LED light source. A lighting device using an LED light source, characterized in that the anisotropic light-diffusing film laminated sheet according to claim 13 is attached to the outer surface or the inner surface of the light-emitting portion of the illumination device using the LED light source. A backlight device, characterized in that the anisotropic light-diffusing film according to any one of claims 1 to 12 is disposed on an exit surface of the backlight unit. A backlight device characterized in that the anisotropic light-diffusing film laminated sheet according to claim 13 is disposed on the surface of the backlight unit -80-201106021. 20. A method for producing an anisotropic light-diffusing film, which is characterized in that the anisotropic light diffusion property of any one of items 1 to 12 of the feminine range is characterized in that at least two incompatible thermoplastic resins are used. Add melt extrusion molding. 2 1 · The method of anisotropic light-diffusing film according to claim 20, wherein the molten resin is extruded from a die into a thinner by an extruder, and the sheet is pressed by a gas pressure and/or The film is formed by adhering to an electrostatic adhesion method and cooling and solidifying. I apply for a film, which is compounded, manufactured, and/or -81
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