1265367 九、發明說明： 【發明所屬之技術領域】 本發朋係關於一種投影鏡頭組及其反射單元，特別是 指一種應用於影像投影系統之投影鏡頭組及其反射單元。 【先前技術】 由於大顯示面積、小型化以及輕量化系統的多重需求 下，影像投影系統成為目前光電產業中最熱門的分項之 一。目前市面上之投影系統大致上分為三大類型，分別為 液晶投影系統(Liquid Crystal Display，LCD)、單晶石夕液晶 投影系統(Liquid Crystal on Silicon，LCOS)及數位光源處 理器投影系統(Digital Light Processing，DLP)，其中，DLP 由於具有南党度、正確的色調重現性、快速的反應時間、 無雜訊及輕薄短小等優點，因而成為目前新一代熱門的投 影系統之一。 • 如圖1所示，習知DLP式投影系統1係採用數位控 制’並利用反射光原理’將來自光源11之光集聚之後經 由透鏡12聚焦’再穿過紅綠藍三色的彩色濾光片13後， 投射至數位微鏡晶片（Digital Micro-mirror Device，DMD ) 14上，數位微鏡晶片14上具有許多微小的可動鏡片，經 由驅動電極控制可動鏡片傾斜角度及偏轉時間，切換光反 射進入投影鏡頭組15 ’而投影鏡頭組15 —般係包含複數 片透鏡’其通¥搭配使用一反射鏡151來使光線轉折，夢 由反射鏡151改變光路徑後讓光線經過透鏡放大而投射至 5 1265367 - 螢幕16成像。 - 其中，數位微鏡晶片（DMD)14係用來取代傳統液晶投 影機中，負責呈現影像的液晶面板，是一項非常高精密的 技術，如圖2所示，數位微鏡晶片（DMD)14係由CMOS SRAM記憶晶胞141與微小可動鏡片142構成，每一可動 鏡片142相當於一個畫素(Pixei)，且每個可動鏡片142都 能將光線從兩個方向反射出去，反射方向則視可動鏡片 _ 142底層的記憶晶胞141而定，舉例來說，當記憶晶胞141 處於「ON」狀態時，可動鏡片142會旋轉至+ 12度，若記 憶晶胞141處於「OFF」狀態，可動鏡片142會旋轉至-12 度，藉可動鏡片142旋轉角度的變化而將入射光反射進入 (ON)或是離開（OFF)投影鏡頭組15的入光孔，數位微鏡晶 片14(DMD)係約由一百三十多萬個可動鏡片142所組成， 每個可動鏡片142尺寸約Π um，且可動鏡片142間的間 隙約l.Oum。然而，雖然可動鏡片142間之間隙非常狹小， • 但卻會在投射影像顯示時，將此一間隙給放大而產生縱向 條紋以及橫向條紋，進而導致影像不夠平滑順暢，而影響 整個晝面之呈像品質。目前已知為解決上述之問題，會在 ' 反射鏡151設置一振動單元（圖未示）使得反射鏡151產生 微小振動，用以消除縱向條紋以及橫向條紋，使得影像平 滑順暢，提昇整個晝面之呈像品質。由於投影系統1係為 極精密之光學系統，因此反射鏡151之平坦度要求在1/2 λ内，倘若反射鏡151之平坦度不佳時，投射出之影像可 能會產生扭曲變形的問題，將嚴重影響整個呈像品質。 6 1265367 又’請參照圖3所示，習知之反射鏡151係藉由一框 架152用以固定於一基座（圖未示）上，此框架Μ]係藉由 三個凸點1521以抵觸反射鏡151之表面，以將反射鏡151 固定於基座上，並且藉由數個鎖合元件153將框架152鎖 固於基座上。目前在組裝框架152以及反射鏡151過程 中，由於框架152係藉由凸點1521抵觸固定反射元件 151，因此整個組裝過程中常面臨框架之三個凸點ι512無 法同時均勻施壓抵觸反射鏡151之問題，此舉將會導致反 射鏡151之平坦度不佳，使得反射鏡151的平坦度無法達 到1/2 λ内，而造成整個呈像品質下降。 因此如何提供一種投影鏡頭組及其反射單元，以解決 反射鏡組裝過程中容易導致反射鏡之平坦度不佳的情況 產生’實為目前業界的重要課題之一。 【發明内容】 有鑑於上述課題，本發明之目的為提供一種投影鏡頭 組及其反射單元，使反射鏡組裝過程中獲得較佳之平坦 度。 一 緣是，為達上述目的，依本發明之反射單元，包含一 托持元件、—㈣以及—反射元件。其中，框架與托持元 件連結，其具有-第-壓合部與—第二壓合部，第一壓合 部與第二壓合部分職置於_相對應之二侧，以及反: 元件設置於托持元件與框架之間，使第一壓合部及第二壓 合部壓合於反射元件之一表面。 1265367 • 又，為達上述目的，依本發明之投影鏡頭組，包含一 鏡頭筒以及一反射單元。其中，鏡頭筒具有一通孔，反射 單元設置於通孔内。反射單元具有一托持元件、一框架以 及一反射元件。框架與托持元件連結，其具有一第一壓合 部以及一第二壓合部，第一壓合部與第二壓合部分別設置 於框架相對應之二侧，以及反射元件設置於托持元件與框 架之間，使第一壓合部及第二壓合部壓合於反射元件之= • 表面。 承上所述，因依據本發明之投影鏡頭組及其反射單 元，其係藉由框架之第一壓合部以及第二壓合部壓合於反 射元件之一表面，與習知技術相比較，由於第一壓合部以 及弟^一壓合部相對應設置’並且第一壓合部與第二壓合部 與反射元件係為面接觸，因此第一壓合部以及第二壓合部 可均勻施壓於反射元件之表面用以壓合固定反射元件，並 且不會影響反射元件之平坦度，使得反射元件具有良好之 • 平坦度，以達到最佳之呈像品質。 【實施方式】 以下將參照相關圖式，說明依本發明較佳實施例之投 影鏡頭組及其反射單元，其中相同的元件將以相同的參照 符號加以說明。 請參閱圖4、圖5以及圖6所示，分別為本發明較佳 實施例之框架的立體圖及虛線a-a’之剖視圖，以及本發明 較佳實施例之反射單元的示意圖。 1265367 . 反射單元2包含一托持元件21、一框架22、一反射 元件23以及數個鎖合元件24。 本較佳實施例中’托持元件21係為用以承載框架22 以及反射元件23。框架22為一四邊形之框架且與托持元 件21連結，此框架22具有一第一壓合部221以及一第二 壓合部222。第一壓合部221與第二壓合部222分別設置 於框架22相面對之二側邊，並且第一壓合部221與第二 壓合部222分別為一彈性壓合部，且兩者呈一條狀壓條。 •本較佳實施例中，第一壓合部221及第二壓合部222 兩者之剖面係呈一 v字形。雖然圖中所示之第一壓合部221 及第二壓合部222之剖面係呈一 v字形，但並不限定於 此，兩者之剖面亦可呈一圓弧形或是其他不規則之曲線。 反射元件23係為一鏡片，反射元件23係設置於托持 元件21與框架22之間，並且第一壓合部221與第二壓合 部222恰好壓合於反射元件23之一表面上。 ⑩ 本較佳實施例之鎖合元件24可為一螺絲，並且托持 元件21開設有相對應之複數個螺孔211以及框架22亦開 設有相對應之複數個孔洞223，當鎖合元件24穿過孔洞 223且藉由螺孔211將框架22固定於托持元件21上，此 時反射元件23亦藉由框架22之第一壓合部221及第二壓 合部222壓合固定於托持元件21上。 本發明較佳實施例之反射單元2組裝時，將複數個鎖 合70件24分別穿過相對應之孔洞223，藉由螺孔211將框 架22固定於托持元件21上，再者，反射元件23藉由框 1265367 架22之第一壓合部221及第二壓合部222壓合固定於托 持元件21上，由於第一壓合部221以及第二壓合部222 分別為一彈性壓條’並且設置於框架之相對應之兩側邊， 因此在反射單元2組裝過程中，第一壓合部221與第二廢 合部222與反射元件23係為面接觸，可均勻施壓於反射 元件23以壓合固定反射元件23，可以使得反射元件23具 有良好的平坦度，以呈現最佳之呈像品質。 又，請參閱圖7所示，為本發明較佳實施例之反射單 ® 元2搭配一震動單元共同作動之示意圖。其中，振動單元 32具有一振動元件321以及一基座322。振動元件321以 及托持元件21設置於基座322内。本較佳實施例中，振 動元件321係為一音圈馬達，用以帶動反射單元2產生微 小震動。 又，請參閱圖8所示，為本發明較佳實施例之投影鏡 頭組的示意圖。投影鏡頭組3，包含一鏡頭筒31、一振動 φ 單元32、以及一反射單元2。其中，反射單元2以及振動 單元32如同前述之反射單元2以及振動單元32，在此給 予相同符號名稱，益且不加以贅述。鏡頭筒31具有一通 - 孔311。在此，振動元件321與托持元件21設置於基座 322内，再將基座322固定於通孔31]L内，以將反射單元 2及振動單元32固定於鏡頭筒31内。俾使振動元件321 帶動反射單元2使其產生微小振動，可用以消除如習知之 數位微鏡晶片所產生之縱向條紋以及橫向條紋，使得影像 平滑順暢，提昇整個畫面之呈像品質。 1265367 承上所述，因依據本發明之投影鏡頭組及其反射單 元’其係藉由框架之第一壓合部以及第二壓合部壓合於反 射70件之一表面，與習知技術相比較，由於第一壓合部以 及第二壓合部相對應設置，以及第一壓合部與第二壓合部 為彈性壓合部，並且第一壓合部與第二壓合部與反射元件 係為面接觸，因此第一壓合部以及第二壓合部可均勻施壓 於反射元件之表面用以壓合固定反射元件，並且不會影響 馨反射元件之平坦度，使得反射元件具有良好之平坦度，以 達到最佳之呈像品質。 【圖式簡單說明】 圖1為習知之數位光源處理器投影系統的示意圖； 圖2為習知之數位微鏡晶片的示意圖； 圖3為習知之反射單元與框架組裝後的上視圖； 圖4為本發明較佳實施例之框架的立體圖； 圖5為圖4中之虛線a-a’的剖視圖； 圖6為本發明較佳實施例之反射單元的示意圖； • 圖7為本發明較佳實施例之反射單元搭配一振動單元 共同作動之示意圖；以及 圖8為本發明較佳實施例之投影鏡頭組的示意圖。 元件符號說明： 1 DLP式投影系統 12653671265367 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a projection lens group and a reflection unit thereof, and more particularly to a projection lens group applied to an image projection system and a reflection unit thereof. [Prior Art] Due to the large display area, miniaturization, and multiple demands of lightweight systems, image projection systems have become one of the most popular sub-items in the photovoltaic industry. At present, the projection systems on the market are roughly divided into three types, namely, liquid crystal display (LCD), liquid crystal on silicon (LCOS) and digital light source processor projection system ( Digital Light Processing (DLP), which has become one of the most popular projection systems in the new generation due to its advantages of Southern Party, correct tone reproducibility, fast response time, no noise, and lightness and shortness. • As shown in FIG. 1 , the conventional DLP type projection system 1 adopts digital control 'and uses the principle of reflected light to collect the light from the light source 11 and then focuses it through the lens 12' and then passes through the color filters of the red, green and blue colors. After the film 13, the film is projected onto a digital micro-mirror device (DMD) 14, which has a plurality of tiny movable lenses, and controls the tilt angle and the deflection time of the movable lens via the driving electrodes to switch the light reflection. Entering the projection lens group 15' and the projection lens group 15 generally includes a plurality of lenses. The lens 151 is used in combination with a mirror 151 to convert the light. The mirror 151 changes the light path and then the light is projected through the lens to be projected to 5 1265367 - Screen 16 imaging. - Among them, the digital micromirror wafer (DMD) 14 is used to replace the liquid crystal panel responsible for rendering images in a conventional liquid crystal projector. It is a very high-precision technology, as shown in Figure 2, a digital micromirror wafer (DMD). The 14 series is composed of a CMOS SRAM memory cell 141 and a micro movable lens 142. Each movable lens 142 is equivalent to one pixel (Pixei), and each movable lens 142 can reflect light from two directions, and the direction of reflection is Depending on the memory cell 141 of the bottom surface of the movable lens 142, for example, when the memory cell 141 is in the "ON" state, the movable lens 142 is rotated to +12 degrees, and if the memory cell 141 is in the "OFF" state. The movable lens 142 is rotated to -12 degrees, and the incident light is reflected (ON) or left (OFF) into the light entrance hole of the projection lens group 15 by the change of the rotation angle of the movable lens 142, and the digital micromirror wafer 14 (DMD) The system is composed of more than 1.3 million movable lenses 142, each movable lens 142 has a size of about um um, and a gap between the movable lenses 142 is about 1.0 μm. However, although the gap between the movable lenses 142 is very narrow, but the projections are displayed, the gap is enlarged to produce vertical stripes and lateral stripes, which results in an image that is not smooth and smooth, and affects the entire surface. Like quality. It is known that in order to solve the above problem, a vibration unit (not shown) is disposed in the mirror 151 to cause the mirror 151 to generate minute vibrations for eliminating longitudinal stripes and lateral stripes, so that the image is smooth and smooth, and the entire surface is lifted. Image quality. Since the projection system 1 is an extremely precise optical system, the flatness of the mirror 151 is required to be within 1/2 λ. If the flatness of the mirror 151 is not good, the projected image may be distorted. Will seriously affect the quality of the entire image. 6 1265367 Again, please refer to FIG. 3, the conventional mirror 151 is fixed on a base (not shown) by a frame 152, which is resisted by three bumps 1521. The surface of the mirror 151 is used to fix the mirror 151 to the base, and the frame 152 is locked to the base by a plurality of locking elements 153. At present, in the process of assembling the frame 152 and the mirror 151, since the frame 152 is in contact with the fixed reflective member 151 by the bump 1521, the three bumps 512 of the frame are often faced with the uniform pressure of the resist mirror 151 at the same time. The problem is that the flatness of the mirror 151 will be poor, so that the flatness of the mirror 151 cannot be within 1/2 λ, resulting in a deterioration in the overall image quality. Therefore, how to provide a projection lens group and a reflection unit thereof to solve the problem that the flatness of the mirror is easily caused during the assembly of the mirror is one of the important issues in the industry. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a projection lens group and a reflection unit thereof, which achieve better flatness during assembly of the mirror. One reason is that, in order to achieve the above object, the reflecting unit according to the present invention comprises a holding member, a (four) and a reflecting member. Wherein, the frame is coupled to the holding member, and has a - first nip and a second nip, the first nip and the second nip are placed on the opposite side of the _, and the opposite: The first nip and the second nip are pressed between the holding element and the frame, and the first nip and the second nip are pressed against one surface of the reflective element. 1265367 • Also, for the above purpose, the projection lens assembly according to the present invention comprises a lens barrel and a reflection unit. Wherein, the lens barrel has a through hole, and the reflection unit is disposed in the through hole. The reflecting unit has a holding member, a frame and a reflecting member. The frame is coupled to the holding member, and has a first nip portion and a second nip portion. The first nip portion and the second nip portion are respectively disposed on two sides of the frame, and the reflective member is disposed on the bracket. Between the holding member and the frame, the first nip and the second nip are pressed against the surface of the reflective element. According to the present invention, the projection lens assembly and the reflection unit thereof according to the present invention are pressed against the surface of one of the reflective members by the first nip portion and the second nip portion of the frame, compared with the prior art. The first nip portion and the second nip portion are in surface contact with each other, and the first nip portion and the second nip portion are in surface contact with the reflective member, so the first nip portion and the second nip portion The surface of the reflective element can be uniformly pressed to press and fix the reflective element without affecting the flatness of the reflective element, so that the reflective element has good flatness for optimum image quality. [Embodiment] Hereinafter, a projection lens group and a reflection unit thereof according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals. Referring to Figures 4, 5 and 6, there are respectively a perspective view of a frame and a cross-sectional view of a dashed line a-a' of a preferred embodiment of the present invention, and a schematic view of a reflecting unit in accordance with a preferred embodiment of the present invention. 1265367. The reflecting unit 2 comprises a holding element 21, a frame 22, a reflecting element 23 and a plurality of locking elements 24. In the preferred embodiment, the holding member 21 is for carrying the frame 22 and the reflecting member 23. The frame 22 is a quadrilateral frame and is coupled to the holding member 21. The frame 22 has a first nip 221 and a second nip 222. The first nip portion 221 and the second nip portion 222 are respectively disposed on opposite sides of the frame 22, and the first nip portion 221 and the second nip portion 222 are respectively an elastic nip portion, and two The person is in the form of a strip. In the preferred embodiment, the first nip 221 and the second nip 222 have a v-shaped cross section. Although the cross-sections of the first nip portion 221 and the second nip portion 222 shown in the figure have a v-shape, the present invention is not limited thereto, and the cross-sections of the two may also have a circular arc shape or other irregularities. The curve. The reflective element 23 is a lens, the reflective element 23 is disposed between the holding element 21 and the frame 22, and the first nip 221 and the second nip 222 are just pressed against one surface of the reflective element 23. The locking component 24 of the preferred embodiment can be a screw, and the supporting component 21 is provided with a corresponding plurality of screw holes 211 and the frame 22 is also provided with a corresponding plurality of holes 223, when the locking component 24 is The frame 22 is fixed to the holding member 21 through the hole 223, and the reflective member 23 is also pressed and fixed to the support by the first nip 221 and the second nip 222 of the frame 22. Hold component 21. In the assembly of the reflective unit 2 of the preferred embodiment of the present invention, a plurality of locks 70 are respectively passed through the corresponding holes 223, and the frame 22 is fixed to the holding member 21 by the screw holes 211. The first nip portion 221 and the second nip portion 222 are respectively elastically fixed to the holding member 21 by the first nip portion 221 and the second nip portion 222 of the frame 1265367, and the first nip portion 221 and the second nip portion 222 are respectively elastic. The bead is disposed on the opposite sides of the frame. Therefore, during the assembly of the reflection unit 2, the first nip 221 and the second waste portion 222 are in surface contact with the reflective member 23, and can be uniformly pressed. The reflective member 23 is fixed to the reflective member 23 by press-fitting, so that the reflective member 23 can have a good flatness to exhibit an optimum image quality. In addition, please refer to FIG. 7 , which is a schematic diagram of the reflection unit ® 2 coupled with a vibration unit in accordance with a preferred embodiment of the present invention. The vibration unit 32 has a vibration element 321 and a base 322. The vibrating member 321 and the holding member 21 are disposed in the susceptor 322. In the preferred embodiment, the vibrating element 321 is a voice coil motor for driving the reflecting unit 2 to generate small vibrations. Further, please refer to FIG. 8, which is a schematic diagram of a projection lens group according to a preferred embodiment of the present invention. The projection lens group 3 includes a lens barrel 31, a vibration φ unit 32, and a reflection unit 2. The reflecting unit 2 and the vibrating unit 32 are the same as the reflecting unit 2 and the vibrating unit 32 described above, and the same symbolic names are given herein, and will not be described again. The lens barrel 31 has a through hole 311. Here, the vibrating element 321 and the holding element 21 are disposed in the base 322, and the base 322 is fixed in the through hole 31] L to fix the reflecting unit 2 and the vibrating unit 32 in the lens barrel 31. The vibrating element 321 drives the reflecting unit 2 to generate minute vibrations, which can be used to eliminate vertical stripes and lateral stripes generated by the conventional micromirror wafer, so that the image is smooth and smooth, and the image quality of the entire image is improved. 1265367 According to the above, the projection lens assembly and the reflection unit thereof according to the present invention are pressed against one surface of the reflection 70 by the first nip portion and the second nip portion of the frame, and the prior art In comparison, since the first nip portion and the second nip portion are correspondingly disposed, and the first nip portion and the second nip portion are elastic nip portions, and the first nip portion and the second nip portion are The reflective element is in surface contact, so that the first nip and the second nip can be uniformly applied to the surface of the reflective element for pressing and fixing the reflective element without affecting the flatness of the sinusoidal reflective element, so that the reflective element Has a good flatness to achieve the best image quality. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional digital light source processor projection system; FIG. 2 is a schematic view of a conventional digital micromirror wafer; FIG. 3 is a top view of a conventional reflective unit assembled with a frame; Figure 5 is a cross-sectional view of a broken line a-a' in Figure 4; Figure 6 is a schematic view of a reflecting unit in accordance with a preferred embodiment of the present invention; FIG. 8 is a schematic diagram of a projection lens assembly according to a preferred embodiment of the present invention; FIG. Component symbol description: 1 DLP projection system 1265367
12 透鏡 13 彩色濾光片 14 數位微鏡晶片 141 記憶晶胞 142 可動鏡片 15 投影鏡頭組 151 反射鏡 152 框架 1521 凸點 153 鎖合元件 16 螢幕 2 反射單元 21 托持元件 211 螺孔 22 框架 221 第一壓合部 222 第二壓合部 223 孔洞 23 反射元件 24 鎖合元件 3 投影鏡頭組 31 鏡頭筒 311 通孔 32 振動單元 1265367 321 振動元件 322 基座12 Lens 13 Color filter 14 Digital micromirror wafer 141 Memory cell 142 Movable lens 15 Projection lens group 151 Mirror 152 Frame 1521 Bump 153 Locking element 16 Screen 2 Reflecting unit 21 Holding element 211 Screw hole 22 Frame 221 First nip 222 second nip 223 hole 23 reflective element 24 locking element 3 projection lens group 31 lens barrel 311 through hole 32 vibration unit 1265367 321 vibration element 322 pedestal