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JP2017083761A - Optical element - Google Patents

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JP2017083761A
JP2017083761A JP2015214406A JP2015214406A JP2017083761A JP 2017083761 A JP2017083761 A JP 2017083761A JP 2015214406 A JP2015214406 A JP 2015214406A JP 2015214406 A JP2015214406 A JP 2015214406A JP 2017083761 A JP2017083761 A JP 2017083761A
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Prior art keywords
optical element
base material
polarizing film
resin
polarizer
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Inventor
豊 大坪
Yutaka Otsubo
豊 大坪
直樹 荒川
Naoki Arakawa
直樹 荒川
真紀子 古川
Makiko FURUKAWA
真紀子 古川
政史 金田
Masashi Kaneda
政史 金田
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Polatechno Co Ltd
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Polatechno Co Ltd
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Priority to JP2015214406A priority Critical patent/JP2017083761A/en
Priority to TW105130750A priority patent/TW201726412A/en
Priority to CN201680062674.1A priority patent/CN108351455A/en
Priority to KR1020187014089A priority patent/KR20180078264A/en
Priority to PCT/JP2016/079996 priority patent/WO2017073303A1/en
Priority to HK18111341.3A priority patent/HK1252012A1/en
Publication of JP2017083761A publication Critical patent/JP2017083761A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • 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
    • 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
    • B32B27/08—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 of synthetic resin
    • 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
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)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
    • 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
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • 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
    • B32B2307/42—Polarizing, birefringent, filtering
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)

Abstract

【課題】耐衝撃性や耐久性に優れた偏光特性を有する光学素子を提供する。【解決手段】入射した光を偏光させる偏光子を備える偏光フィルム１０２と、偏光フィルム１０２に積層されたレンズ基材１０４とを備え、偏光フィルム１０２とレンズ基材１０４との間に樹脂からなるアンカー層１６を備える光学素子１００とする。【選択図】図１An optical element having polarization characteristics excellent in impact resistance and durability is provided. An anchor made of a resin is provided between a polarizing film and a lens substrate. The polarizing film includes a polarizer that polarizes incident light and a lens substrate laminated on the polarizing film. The optical element 100 including the layer 16 is provided. [Selection] Figure 1

Description

本発明は、偏光特性を有する光学素子に関する。   The present invention relates to an optical element having polarization characteristics.

近年アウトドアスポーツ等において偏光特性をもたせたサングラスが広く使用されている。このようなサングラスに使用されている偏光レンズは、軽く割れにくいという利点からプラスチック製のものが多くなっている。（特許文献１）   In recent years, sunglasses having polarization characteristics have been widely used in outdoor sports and the like. Polarizing lenses used in such sunglasses are often made of plastic because of the advantage of being light and difficult to break. (Patent Document 1)

特許文献１には、色むらや歪みを抑制した偏光レンズが開示されている。当該文献には、偏光膜の両面に一対の保護フィルムが積層された偏光シートと、偏光シートの裏側に一体に固着される樹脂製のレンズ基材層とを備えた偏光レンズが開示されている。   Patent Document 1 discloses a polarizing lens that suppresses color unevenness and distortion. This document discloses a polarizing lens including a polarizing sheet in which a pair of protective films are laminated on both surfaces of a polarizing film, and a resin lens base material layer that is integrally fixed to the back side of the polarizing sheet. .

また、特許文献２には、液晶表示装置等の表面を保護するための保護板（前面板等）として、偏光シートと保護基材とを備えた保護板が開示されている。前記保護基材の形状としては、表面が平坦なものや湾曲しているものなど特に限定されず、また、材料としては、透明性を持つ硬化性樹脂が開示されている。   Patent Document 2 discloses a protective plate including a polarizing sheet and a protective base material as a protective plate (front plate or the like) for protecting the surface of a liquid crystal display device or the like. The shape of the protective substrate is not particularly limited, such as a flat surface or a curved surface, and a curable resin having transparency is disclosed as a material.

さらに、特許文献３には偏光シートと保護基材との間に光学異方層を備えた保護板が開示されている。   Furthermore, Patent Document 3 discloses a protective plate having an optical anisotropic layer between a polarizing sheet and a protective base material.

上記の偏光レンズや保護板など、表面が湾曲している樹脂基材を使用する場合には、偏光フィルムに樹脂を射出成型して形成する方法が一般的に知られている。   In the case of using a resin base material having a curved surface, such as the above-described polarizing lens or protective plate, a method is generally known in which a resin is formed by injection molding on a polarizing film.

特開２０１０−３９２２０号公報JP 2010-39220 A 特開２０１１−２５２９３４号公報JP 2011-252934 A 特開２０１１−１３８１５２号公報JP 2011-138152 A

以下、本発明の形態としてレンズ基材を例に説明するが、本発明の適用範囲はこれに限定されるものではない。偏光フィルムにレンズ基材層を射出成形して偏光レンズを形成した場合、偏光レンズに対して衝撃が加えられた場合等においてレンズ基材層から偏光フィルムの一部が剥がれる等の損傷が生ずるおそれがある。すなわち、偏光レンズの耐衝撃性や耐久性が低い。   Hereinafter, a lens base material will be described as an example of the present invention, but the scope of the present invention is not limited thereto. When a lens base layer is formed by injection molding on a polarizing film to form a polarizing lens, damage such as part of the polarizing film may be peeled off from the lens base layer when an impact is applied to the polarizing lens. There is. That is, the impact resistance and durability of the polarizing lens are low.

そこで、本発明は、耐衝撃性や耐久性に優れ、偏光特性を有する光学素子を提供することを目的とする。   Therefore, an object of the present invention is to provide an optical element that has excellent impact resistance and durability and has polarization characteristics.

本発明の１つの態様は、入射した光を偏光させる偏光子を備える偏光フィルムと、前記偏光フィルムに積層された樹脂基材と、を備える光学素子であって、前記偏光フィルムと前記樹脂基材との間に樹脂からなるアンカー層を備えることを特徴とする光学素子である。   One aspect of the present invention is an optical element including a polarizing film including a polarizer that polarizes incident light, and a resin base material laminated on the polarizing film, the polarizing film and the resin base material And an anchor layer made of a resin.

ここで、前記アンカー層は、非晶系ポリエステル樹脂であることが好適である。   Here, the anchor layer is preferably an amorphous polyester resin.

また、前記偏光フィルムは、前記偏光子であるポリビニルアルコールと、前記ポリビニルアルコールの裏面に接着されたトリアセチルセルロースと、を含み、前記アンカー層は、前記トリアセチルセルロースと前記樹脂基材との間に設けられていることが好適である。   The polarizing film includes polyvinyl alcohol as the polarizer and triacetyl cellulose bonded to the back surface of the polyvinyl alcohol, and the anchor layer is between the triacetyl cellulose and the resin base material. It is preferable that it is provided.

また、前記偏光フィルムは、前記偏光子と、光学異方層と、を含み、前記アンカー層は、前記光学異方層と前記樹脂基材との間に設けられていることが好適である。   In addition, it is preferable that the polarizing film includes the polarizer and an optical anisotropic layer, and the anchor layer is provided between the optical anisotropic layer and the resin base material.

本発明によれば、耐衝撃性や耐久性に優れ、偏光特性を有する光学素子を提供することができる。   According to the present invention, it is possible to provide an optical element that has excellent impact resistance and durability and has polarization characteristics.

本発明の実施の形態における光学素子の構成を示す断面図である。It is sectional drawing which shows the structure of the optical element in embodiment of this invention.

本発明の実施の形態における光学素子１００は、図１に示すように、偏光フィルム１０２及びレンズ基材１０４を含んで構成される。   As shown in FIG. 1, the optical element 100 according to the embodiment of the present invention includes a polarizing film 102 and a lens substrate 104.

偏光フィルム１０２は、第１基材１０、偏光子１２、第２基材１４及びアンカー層１６を接着層１８ａ，１８ｂを介して積層して構成される。光学素子１００は、このような積層体である偏光フィルム１０２にレンズ基材１０４を固着させた構成とされる。   The polarizing film 102 is configured by laminating a first base material 10, a polarizer 12, a second base material 14, and an anchor layer 16 via adhesive layers 18a and 18b. The optical element 100 has a configuration in which a lens substrate 104 is fixed to a polarizing film 102 that is such a laminate.

第１基材１０及び第２基材１４は、偏光フィルム１０２の保護層となる部材である。第１基材１０及び第２基材１４は、任意に選択することができるが、例えばトリアセチルセルロース（ＴＡＣ）フィルム、アクリルフィルム、環状オレフィン系フィルム等を用いることが好適である。一例として、ＴａｃＢｒｉｇｈｔ社製Ｐ９６０ＧＬ等を適用することができる。第１基材１０及び第２基材１４の厚さは、これに限定されるものではないが、２０μｍ以上１００μｍ以下とすることが好適である。   The first base material 10 and the second base material 14 are members that serve as a protective layer for the polarizing film 102. Although the 1st base material 10 and the 2nd base material 14 can be selected arbitrarily, it is suitable to use a triacetyl cellulose (TAC) film, an acrylic film, a cyclic olefin system film, etc., for example. As an example, P960GL manufactured by TacBright, etc. can be applied. Although the thickness of the 1st base material 10 and the 2nd base material 14 is not limited to this, It is suitable to set it as 20 micrometers or more and 100 micrometers or less.

なお、第１基材１０の偏光子１２とは反対側の面には保護フィルムを設けてもよい。保護フィルムは、例えば、ポリカーボネイト、ポリアミド、ポリエステル、ポリスチレン等の光学的に透明であり、耐熱性、耐水性及び耐衝撃性に優れたフィルムとすることが好適である。   In addition, you may provide a protective film in the surface on the opposite side to the polarizer 12 of the 1st base material 10. FIG. The protective film is preferably an optically transparent film made of, for example, polycarbonate, polyamide, polyester, polystyrene, or the like, and excellent in heat resistance, water resistance, and impact resistance.

偏光子１２は、特定の方向に偏光した光のみを透過する層である。偏光子１２の形成方法は、任意に選択することができる。例えば、ポリビニルアルコール（ＰＶＡ）フィルムを二色性材料により染色し、延伸処理を行うことにより形成することができる。二色性材料は、例えば、ヨウ素化合物やアゾ化合物及び／又はその塩を含有する材料とすることができる。   The polarizer 12 is a layer that transmits only light polarized in a specific direction. The formation method of the polarizer 12 can be selected arbitrarily. For example, it can be formed by dyeing a polyvinyl alcohol (PVA) film with a dichroic material and performing a stretching treatment. The dichroic material can be, for example, a material containing an iodine compound, an azo compound and / or a salt thereof.

アゾ化合物及び／又はその塩を含む染料系材料は以下のように得ることができる。

Figure 2017083761
（１）式中Ｒ１、Ｒ２は各々独立に水素原子、低級アルキル基、低級アルコキシル基を示し、ｎは１又は２で示されるアゾ化合物及びその塩。
（２）Ｒ１、Ｒ２が各々独立に水素原子、メチル基、メトキシ基のいずれかである（１）記載のアゾ化合物及びその塩。
（３）Ｒ１、Ｒ２が水素原子である（１）記載のアゾ化合物及びその塩。 A dye-based material containing an azo compound and / or a salt thereof can be obtained as follows.
Figure 2017083761
 (1) In the formula, R1 and R2 each independently represent a hydrogen atom, a lower alkyl group, or a lower alkoxyl group, and n is an azo compound represented by 1 or 2, or a salt thereof.
(2) The azo compound and salt thereof according to (1), wherein R1 and R2 are each independently a hydrogen atom, a methyl group, or a methoxy group.
(3) The azo compound and the salt thereof according to (1), wherein R1 and R2 are hydrogen atoms.

例えば、以下に示す工程で得られる材料を用いることが好適である。４−アミノ安息香酸１３．７部を水５００部に加え、水酸化ナトリウムで溶解する。得られた物質を冷却して１０℃以下で３５％塩酸３２部を加え、次に亜硝酸ナトリウム６．９部を加え、５〜１０℃で１時間攪拌する。そこへアニリン−ω−メタンスルホン酸ソーダ２０．９部を加え、２０〜３０℃で攪拌しながら、炭酸ナトリウムを加えてｐＨ３．５とする。さらに、攪拌してカップリング反応を完結させ、濾過して、モノアゾ化合物を得る。得られたモノアゾ化合物を水酸化ナトリウム存在下、９０℃で攪拌し、化学式（２）のモノアゾ化合物１７部を得る。

Figure 2017083761
For example, it is preferable to use a material obtained in the following steps. Add 13.7 parts of 4-aminobenzoic acid to 500 parts of water and dissolve with sodium hydroxide. The obtained material is cooled, 32 parts of 35% hydrochloric acid is added at 10 ° C. or lower, 6.9 parts of sodium nitrite is added, and the mixture is stirred at 5 to 10 ° C. for 1 hour. Thereto, 20.9 parts of aniline-ω-sodium methanesulfonate is added, and sodium carbonate is added to pH 3.5 while stirring at 20-30 ° C. Furthermore, stirring is completed to complete the coupling reaction, and filtration is performed to obtain a monoazo compound. The obtained monoazo compound is stirred at 90 ° C. in the presence of sodium hydroxide to obtain 17 parts of a monoazo compound of the chemical formula (2).
Figure 2017083761

化学式（２）のモノアゾ化合物１２部、４，４'−ジニトロスチルベン−２，２'−スルホン酸２１部を水３００部に溶解させた後、水酸化ナトリウム１２部を加え、９０℃で縮合反応させる。続いて、グルコース９部で還元し、塩化ナトリウムで塩析した後、濾過して化学式（３）で示されるアゾ化合物１６部を得る。

Figure 2017083761
After dissolving 12 parts of monoazo compound of formula (2) and 21 parts of 4,4′-dinitrostilbene-2,2′-sulfonic acid in 300 parts of water, 12 parts of sodium hydroxide is added and condensation reaction is performed at 90 ° C. Let Subsequently, it is reduced with 9 parts of glucose, salted out with sodium chloride, and then filtered to obtain 16 parts of an azo compound represented by the chemical formula (3).
Figure 2017083761

さらに、化合物（３）の染料を０．０１％、シー・アイ・ダイレクト・レッド８１を０．０１％、特許２６２２７４８号公報の実施例１において示されている下記構造式（４）で示される染料を０．０３％、特開昭６０−１５６７５９号公報の実施例２３において公開されている下記構造式（５）で示される染料０．０３％及び芒硝０．１％の濃度とした４５℃の水溶液に厚さ７５μｍのポリビニルアルコール（ＰＶＡ）を４分間浸漬する。このフィルムを３％ホウ酸水溶液中で５０℃で５倍に延伸し、緊張状態を保ったまま水洗、乾燥する。これによって、中性色（平行位ではグレーで、直交位では黒色）となる染料系材料を得ることができる。

Figure 2017083761
Figure 2017083761
 Furthermore, 0.01% of the dye of compound (3), 0.01% of C.I. Direct Red 81, represented by the following structural formula (4) shown in Example 1 of Japanese Patent No. 2622748 45 ° C. at a concentration of 0.03% of the dye, 0.03% of the dye represented by the following structural formula (5) and 0.1% of sodium sulfate disclosed in Example 23 of JP-A-60-156759 A polyvinyl alcohol (PVA) having a thickness of 75 μm is immersed in the aqueous solution for 4 minutes. This film is stretched 5 times at 50 ° C. in a 3% boric acid aqueous solution, washed with water and dried while maintaining a tension state. This makes it possible to obtain a dye-based material that is neutral in color (gray in the parallel position and black in the orthogonal position).
Figure 2017083761
Figure 2017083761

ＰＶＡフィルムは、一例として、クラレ製ＶＦ−ＰＳ＃７５００等を適用することができる。ＰＶＡフィルムは、例えば、延伸前において厚さ７５μｍのフィルムを延伸後において３０μｍ程度となるまで延伸する。   As an example of the PVA film, Kuraray VF-PS # 7500 can be applied. The PVA film is stretched, for example, until a film having a thickness of 75 μm before stretching is about 30 μm after stretching.

なお、偏光子１２には、光学異方層（位相差板）を併せて設けてもよい。光学異方層は、例えば、１／４波長板等などである。   The polarizer 12 may be provided with an optically anisotropic layer (retardation plate). The optical anisotropic layer is, for example, a quarter wavelength plate or the like.

接着層１８ａ，１８ｂは、第１基材１０と偏光子１２及び第２基材１４と偏光子１２をそれぞれ接着する層である。接着層１８ａ，１８ｂは、水系接着剤とすることが好適である。すなわち接着剤成分を水に溶解又は分散させた接着剤を用いることが好適である。例えば、ポリビニルアルコール系樹脂、ウレタン樹脂等にイソシアネート系化合物、エポキシ化合物等を配合した接着剤成分を用いることが好適である。   The adhesive layers 18a and 18b are layers that adhere the first base material 10 and the polarizer 12, and the second base material 14 and the polarizer 12, respectively. The adhesive layers 18a and 18b are preferably water-based adhesives. That is, it is preferable to use an adhesive in which an adhesive component is dissolved or dispersed in water. For example, it is preferable to use an adhesive component obtained by blending an isocyanate compound, an epoxy compound, or the like with a polyvinyl alcohol resin, a urethane resin, or the like.

アンカー層１６は、偏光フィルム１０２とレンズ基材１０４との密着性を高めるために設けられる層である。アンカー層１６は、非晶系ポリエステル樹脂とすることが好適である。   The anchor layer 16 is a layer provided to improve the adhesion between the polarizing film 102 and the lens substrate 104. The anchor layer 16 is preferably an amorphous polyester resin.

アンカー層１６は、以下の工程により形成することができる。まず、主剤を非晶系ポリエステル樹脂として、希釈剤としてシクロヘキサノン及び硬化剤としてイソシアネートを添加する。例えば、非晶質ポリエステル樹脂を１としてシクロヘキサノンを０．３３及びイソシアネートを０．０４の割合で混合した接着剤を生成する。次に、当該配合された接着剤を離型フィルムに塗布し、乾燥工程において溶剤を揮発させる。乾燥工程は、それぞれ４０℃から１００℃の温度範囲に設定された複数の乾燥炉を用いて、接着剤を塗布した離型フィルムから溶剤を揮発させることが好適である。このとき、乾燥後の接着剤の厚みが２５μｍ以上３０μｍ以下となるように塗布量を調整する。その後、接着剤側を第２基材１４に向けて第２基材１４に貼り合わせる。   The anchor layer 16 can be formed by the following process. First, the main component is an amorphous polyester resin, cyclohexanone is added as a diluent, and isocyanate is added as a curing agent. For example, an adhesive in which an amorphous polyester resin is 1 and cyclohexanone is mixed at a ratio of 0.33 and isocyanate at a ratio of 0.04 is generated. Next, the blended adhesive is applied to a release film, and the solvent is volatilized in a drying step. In the drying step, it is preferable to volatilize the solvent from the release film coated with the adhesive using a plurality of drying furnaces each set to a temperature range of 40 ° C to 100 ° C. At this time, the coating amount is adjusted so that the thickness of the adhesive after drying is 25 μm or more and 30 μm or less. Thereafter, the adhesive side is bonded to the second base material 14 with the adhesive side facing the second base material 14.

レンズ基材１０４は、光を透過させる際に屈折や反射等の光学的な効果を与えるために設けられる。レンズ基材１０４は、ポリカーボネイト、ポリウレタン、ポリアクリル等の樹脂によって構成される。より具体的には、加水分解し難く、対黄変性に優れた脂肪族系樹脂を用いることが好適である。   The lens substrate 104 is provided to give optical effects such as refraction and reflection when transmitting light. The lens substrate 104 is made of a resin such as polycarbonate, polyurethane, or polyacryl. More specifically, it is preferable to use an aliphatic resin that is difficult to hydrolyze and excellent in yellowing resistance.

レンズ基材１０４の厚さは、２ｍｍ以上１５ｍｍ以下とすることが好適である。レンズ基材１０４の厚さが２ｍｍ未満の場合には機械的強度が不十分となる可能性があり、１５ｍｍより大きい場合には重くなり過ぎる可能性がある。レンズ基材１０４の形状は、光学素子１００の使用目的に応じた表面の曲面をもつように加工すればよい。   The thickness of the lens substrate 104 is preferably 2 mm or more and 15 mm or less. If the thickness of the lens substrate 104 is less than 2 mm, the mechanical strength may be insufficient, and if it is greater than 15 mm, it may become too heavy. What is necessary is just to process the shape of the lens base material 104 so that it may have the curved surface of the surface according to the intended purpose of the optical element 100.

レンズ基材１０４は、偏光フィルム１０２のアンカー層１６の表面上に原料を射出して形成される。真空成形、プレス成形等によって光学素子１００として求められる曲率に合わせて偏光フィルム１０２を曲げ加工したうえで金型にセットする。金型は偏光フィルム１０２の表面形状に合わせた凹面状のキャビティを備える。偏光フィルム１０２は、金型のキャビティ内に密着させてセットされる。そして、レンズ基材１０４の原料を加熱して、金型のキャビティ内に射出して充填させる。これにより、偏光フィルム１０２のアンカー層１６とレンズ基材１０４とが融着して固着される。   The lens substrate 104 is formed by injecting a raw material on the surface of the anchor layer 16 of the polarizing film 102. The polarizing film 102 is bent according to the curvature required for the optical element 100 by vacuum molding, press molding, or the like, and then set in a mold. The mold includes a concave cavity that matches the surface shape of the polarizing film 102. The polarizing film 102 is set in close contact with the cavity of the mold. And the raw material of the lens base material 104 is heated, and it injects and fills in the cavity of a metal mold | die. Thereby, the anchor layer 16 of the polarizing film 102 and the lens substrate 104 are fused and fixed.

射出形成の条件は、樹脂温度１５０℃以上３８０℃以下とすることが好適である。また、射出時における金型の温度は、８０℃以上１２０℃以下とすることが好適である。このような温度条件下において７００ｋｇｆ／ｃｍ2以上２５００ｋｇｆ／ｃｍ2の射出圧力で樹脂材料を射出することによってレンズ基材１０４を形成することができる。 The injection molding conditions are preferably a resin temperature of 150 ° C. or higher and 380 ° C. or lower. Further, the temperature of the mold at the time of injection is preferably 80 ° C. or higher and 120 ° C. or lower. The resin material can be formed lens substrate 104 by injection at an injection pressure of 700 kgf / cm 2 or more 2,500 kgf / cm 2 in such temperature conditions.

なお、偏光子１２に光学異方層（位相差板）を併せて設けた場合、アンカー層１６は、光学異方層とレンズ基材１０４との間に設けることが好適である。   When the optically anisotropic layer (retardation plate) is provided on the polarizer 12, the anchor layer 16 is preferably provided between the optically anisotropic layer and the lens substrate 104.

本実施の形態における光学素子１００によれば、偏光フィルム１０２の第２基材１４と
レンズ基材１０４との間にアンカー層１６を設けることによって偏光フィルム１０２とレンズ基材１０４との固着性を高めることができる。これにより、光学素子１００に対して機械的な衝撃を与えた場合や加熱と冷却の熱サイクルを繰り返した場合等において偏光フィルム１０２とレンズ基材１０４との間に剥がれが生ずることを抑制することができる。 According to the optical element 100 in the present embodiment, the anchoring layer 16 is provided between the second base material 14 and the lens base material 104 of the polarizing film 102 so that the adhesion between the polarizing film 102 and the lens base material 104 is improved. Can be increased. This suppresses peeling between the polarizing film 102 and the lens substrate 104 when a mechanical impact is applied to the optical element 100 or when a thermal cycle of heating and cooling is repeated. Can do.

なお、本実施の形態では、光学素子１００としてレンズを例に説明したが、樹脂をレンズ基材１０４として偏光フィルム１０２をレンズ基材１０４に固着させる態様の素子であれば本発明の適用範囲となる。ただし、レンズのように曲面を有する素子では機械的な衝撃や熱サイクルを与えたときに偏光フィルム１０２とレンズ基材１０４との間に生ずる応力の影響が大きくなると推察されるが、アンカー層１６を設けることにより偏光フィルム１０２とレンズ基材１０４との剥がれを効果的に抑制することができる。   In this embodiment, a lens is described as an example of the optical element 100. However, any element having an aspect in which a polarizing film 102 is fixed to the lens base material 104 using a resin as the lens base material 104 can be applied to the present invention. Become. However, in the case of an element having a curved surface such as a lens, it is assumed that the influence of stress generated between the polarizing film 102 and the lens substrate 104 is increased when a mechanical shock or thermal cycle is applied. By providing this, peeling between the polarizing film 102 and the lens substrate 104 can be effectively suppressed.

また、偏光フィルム１０２の偏光子１２をアゾ化合物及び／又はその塩を含有する染料とすることによって、レンズ基材１０４の原料となる樹脂を１２０℃以上の高温で射出したときにおいて偏光子１２の特性の劣化を防ぐことができる。これにより、光学素子１００の光学的特性を向上させることができる。また、製造工程を簡素化することが可能となり、光学素子１００の製造コストを抑制することができる。   Further, by using the polarizer 12 of the polarizing film 102 as a dye containing an azo compound and / or a salt thereof, when the resin used as the raw material of the lens substrate 104 is injected at a high temperature of 120 ° C. or higher, the polarizer 12 It is possible to prevent deterioration of characteristics. Thereby, the optical characteristic of the optical element 100 can be improved. In addition, the manufacturing process can be simplified, and the manufacturing cost of the optical element 100 can be suppressed.

なお、本実施の形態ではレンズ基材１０４を例に説明したが、本発明の適用範囲はこれに限定されるものではない。例えば、偏光機能をもたせた液晶表示装置用の保護板（前面板等）に適用することもできる。この場合、レンズ基材１０４の代わりに樹脂基材を適用し、偏光フィルム１０２の第２基材１４と樹脂基材との間にアンカー層１６を設ければよい。   In the present embodiment, the lens substrate 104 has been described as an example, but the scope of application of the present invention is not limited to this. For example, the present invention can be applied to a protective plate (front plate or the like) for a liquid crystal display device having a polarization function. In this case, a resin base material may be applied instead of the lens base material 104, and the anchor layer 16 may be provided between the second base material 14 of the polarizing film 102 and the resin base material.

１０ 第１基材、１２ 偏光子、１４ 第２基材、１６ アンカー層、１８ａ，１８ｂ 接着層、１００ 光学素子、１０２ 偏光フィルム、１０４ レンズ基材。   DESCRIPTION OF SYMBOLS 10 1st base material, 12 Polarizer, 14 2nd base material, 16 Anchor layer, 18a, 18b Adhesion layer, 100 Optical element, 102 Polarizing film, 104 Lens base material.

Claims (4)

入射した光を偏光させる偏光子を備える偏光フィルムと、前記偏光フィルムに積層された樹脂基材と、を備える光学素子であって、
前記偏光フィルムと前記樹脂基材との間に樹脂からなるアンカー層を備えることを特徴とする光学素子。 An optical element comprising: a polarizing film comprising a polarizer that polarizes incident light; and a resin base material laminated on the polarizing film,
An optical element comprising an anchor layer made of a resin between the polarizing film and the resin base material. 請求項１に記載の光学素子であって、
前記アンカー層は、非晶系ポリエステル樹脂であることを特徴とする光学素子。 The optical element according to claim 1,
The optical element, wherein the anchor layer is an amorphous polyester resin. 請求項１又は２に記載の光学素子であって、
前記偏光フィルムは、前記偏光子であるポリビニルアルコールと、前記ポリビニルアルコールの裏面に接着されたトリアセチルセルロースと、を含み、
前記アンカー層は、前記トリアセチルセルロースと前記樹脂基材との間に設けられていることを特徴とする光学素子。 The optical element according to claim 1 or 2,
The polarizing film includes polyvinyl alcohol which is the polarizer, and triacetyl cellulose bonded to the back surface of the polyvinyl alcohol,
The optical element, wherein the anchor layer is provided between the triacetyl cellulose and the resin base material. 請求項１又は２に記載の光学素子であって、
前記偏光フィルムは、前記偏光子と光学異方層と、を含み、
前記アンカー層は、前記光学異方層と前記樹脂基材との間に設けられていることを特徴とする光学素子。 The optical element according to claim 1 or 2,
The polarizing film includes the polarizer and an optically anisotropic layer,
The optical element, wherein the anchor layer is provided between the optically anisotropic layer and the resin base material.
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