1260440 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種鏡頭組及其折彎基座，特別關於一 和用於背投糸統之鏡頭組及其折弯基座。 【先前技術】 投影系統依其原理可區分為液晶投影系統（LiquidBACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens group and a bending base thereof, and more particularly to a lens group for a rear projection system and a bending base thereof. [Prior Art] The projection system can be distinguished into a liquid crystal projection system according to its principle (Liquid
Crystal Display，LCD)、單晶矽液晶投影系統（Uquid Crystal on Silicon ’ LCOS)、數位光源處理技術投影系 統（Digital Light Processing，DLP)…等，而 DLP 由於 具有高亮度、正讀的色調重現性、快速的反應時間、 無雜訊以及輕薄短小等優點，已成為目前新一代熱門的 投影技術之一。 在DLP式投影系統中，係採用數位控制，並利用反射 光原理，將光源集光之後經由透鏡聚焦，再穿過紅綠藍三 色的彩色濾光片後，投射至數位微鏡晶片（Digital Micro-mirror Device，DMD)上。由於微鏡晶片上具有許 多微小的可動鏡片，經由驅動電極控制可動鏡片傾斜角 度以及偏轉時間，再藉由切換光的反射方向由鏡頭組 投射至螢幕呈像。 如圖1及圖2所示，習知之背投鏡頭組1係包括一基 座11、一第一承接環12、一第二承接環13、一第一鏡片 群組14、一第二鏡片群組15、以及一反射鏡。其中基 座Π兩側分別與第一承接環12及第二承接環以相連結， 1260440 並藉由螺絲於螺絲孔12卜122、123、124、131、132、133、 以及134等連結部位逐一固定（請參照圖2所示）。固定後 之第一承接環12係再與第一鏡片群組14組合，第二承接 壞13則與第二鏡片群組15組合，接著基座n底部再與 反射鏡16組合後方完成習知之背投鏡頭組。 由於在一般的投影系統中，反射光線係需先穿過第一 鏡片群組14，再經過反射鏡16反射，然後穿過第二鏡片 群組15，最後投射至螢幕上。因此，如果自光源聚光至投 影於螢幕的路徑中，有些微偏差即可能造成最後無法正確 在屏幕上呈像，故可知在一投影系統中如何進行極精密組 裝以碟保光路徑之精度確實乃一重要課題。進而言之，習 知之背投鏡頭組係由多個部品組合，並利用多個螺絲固 定，易造成組裝過程繁瑣耗時、組裝精度不穩定、呈像效 果不佳之情形，因此，如何使背投鏡頭組精度提高進而得 到較佳之投影效果是投影系統發展之一重要課題。 【發明内容】 有鑑於上述課題，本發明之目的為提供一種部品零件 少、組裝容易、整體精度高之鏡頭組及其折彎基座。 緣是，為達上述目的，本發明之折彎基座係包含一反 射鏡裝設單元、一第一接合單元以及一第二接合單元。反 射鏡裝設單元具有一反射鏡裝設開口，第一接合單元係自 反射鏡裝設單元之一側延設，並具有一第一開口，第一開 口周緣設有一第一結合部。第二接合單元則自反射鏡裝設 1260440 單元之另一側延設，並具有一第二開口’第二開口周緣設 有一第二結合部。反射鏡裝設開口、第一開口與第二開口 係相互連通而自然形成一夾角。 本發明之鏡頭組包含一折幫基座、一第一鏡片群組、 一第二鏡片群組以及一反射鏡。其中，折彎基座包含一反 射鏡裝設單元、一第一接合單元以及一第二接合單元。折 彎基座之構造與前述相同，故在此不加贅述。於此鏡頭組 中，反射鏡係裝設於反射鏡裝設單元之反射鏡裝設開口， 第一鏡片群組與第二鏡片群組係分別組裝於第一結合部 與第二結合部。 承上所述，因本發明之鏡頭組及其折彎基座具有部品 數少之特徵，且不需利用螺絲於多處進行固定，故能夠滅 少以往鏡碩組部品數過多所造成之組裝過程繁瑣困難，更 可以降低工日寸成本及不良率發生，並且由於組裝過程簡 Γ二：精度之不確定因子亦可有效消除，從而提高精度 心疋生，達到較佳之投影效果。 【實施方式】 請參照圖3及圖4所示 組3係包含一折彎基座4、 片群組6以及_反射鏡7。 ，依本發明較佳實施例之鏡頭 一第一鏡片群組5、一第二鏡 其中折彎基座4包含一反射鏡 1260440 裝設單元41、一第一接合單元42以及一第二接合單元43。 反射鏡裝設單元41具有一反射鏡裝設開口 411用以 安裝反射鏡7。第一接合單元42係自反射鏡裝設單元41 之一側延設，並具有一第一開口 421，第一開口 421周緣 設有一第一結合部4211用以與第一鏡片群組5進行級 裝。第二接合單元43則自反射鏡裝設單元41之另—側延 設，並具有一第二開口 431，第二開口 431周緣設有一第 二結合部4311用以與第二鏡片群組6進行組裝。反射鏡 裝設開口 411、第一開ο 咖— 與弟二開口 431係相互連通 而自然形成一夾角0由於笫—从人抑 元43係自反射鏡裝料单元42與第二接合單 組裝零件造紅繁私作，達=_設，故可免除過去 並進而提高整體精度。 低工呀、成本、不良率、 第一結合部4211與第二紐 -鏡片群組5以及第二鏡片° "M311係分別用以與第 第-結合部仙與第二結合:6纟讀’於本實施例中， 其亦可以分別為卡槽或是卡塊。311係分別為螺紋，當然 本發明之折彎基座4已包八 此不加贅述。 3於别述鏡頭組3中，故在 限制性者。任何未脫離 之等效修改或變更，均 以上所述僅為舉例性，而非為 本發明之精神與範疇，而對其進^ 應包含於後附之申請專利範圍中^ 【圖式簡單說明] 1260440 圖1為一示意圖，顯示習知之鏡頭組各部品拆解之剖 面圖； 圖2為一示意圖 圖3為一示意圖 各部品拆解之剖面圖 圖4為一示意圖 顯示習知之基座之侧視圖； 顯示依本發明較佳實施例之鏡頭組 以及 座之側視圖。 元件符號說明： 1 背投鏡頭組 11 基座 12 第一承接環 13 弟^一承接環 14 第一鏡片群組 15 第二鏡片群組 16 反射鏡 121 螺絲孔 122 螺絲孔 123 螺絲孔 124 螺絲孔 131 螺絲孔 132 螺絲孔 133 螺絲孔 134 螺絲孔 顯示依本發明較佳實施例之折彎基 鏡頭組 折彎基座 反射鏡裝設單元 反射鏡裝設開口 第一接合單元 第一開口 第一結合部 第二接合單元 第二開口 第二結合部 第一鏡片群組 第二鏡片群組 反射鏡 11Crystal Display, LCD), Uquid Crystal on Silicon 'LCOS, Digital Light Processing (DLP), etc., while DLP reproduces with high brightness and positive read tone Sexual, fast response time, no noise, and light and short, has become one of the new generation of popular projection technology. In the DLP projection system, the digital control is adopted, and the light source is collected by light, then focused by a lens, and then passed through a red, green, and blue color filter, and then projected onto a digital micromirror wafer (Digital Micro-mirror Device, DMD). Since there are many tiny movable lenses on the micromirror wafer, the tilt angle and the deflection time of the movable lens are controlled via the driving electrodes, and then projected by the lens group to the screen image by the direction of the switching light. As shown in FIG. 1 and FIG. 2, the conventional rear projection lens set 1 includes a base 11, a first receiving ring 12, a second receiving ring 13, a first lens group 14, and a second lens group. Group 15, and a mirror. The two sides of the base are respectively connected with the first receiving ring 12 and the second receiving ring, and 1260440 is screwed to the connecting portions of the screw holes 12, 122, 123, 124, 131, 132, 133, and 134. Fixed (please refer to Figure 2). The fixed first receiving ring 12 is combined with the first lens group 14, and the second receiving bad 13 is combined with the second lens group 15, and then the bottom of the base n is combined with the mirror 16 to complete the conventional back. Shoot the lens group. Since in a typical projection system, the reflected light is first passed through the first lens group 14, reflected by the mirror 16, then passed through the second lens group 15, and finally projected onto the screen. Therefore, if the light source is condensed to the path projected on the screen, some micro-deviation may cause the image to be correctly displayed on the screen. Therefore, it is known how to perform extremely precise assembly in a projection system. It is an important issue. In other words, the conventional rear projection lens set is composed of a plurality of parts and is fixed by a plurality of screws, which is apt to cause a cumbersome and time-consuming assembly process, unstable assembly precision, and poor image rendering effect. Therefore, how to make a rear projection The improvement of the accuracy of the lens group and the better projection effect are an important issue in the development of the projection system. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a lens unit and a bending base thereof which have fewer parts, are easy to assemble, and have high overall accuracy. For the above purpose, the bending base of the present invention comprises a mirror mounting unit, a first joining unit and a second joining unit. The mirror mounting unit has a mirror mounting opening. The first engaging unit is extended from one side of the mirror mounting unit and has a first opening. The first opening is provided with a first joint. The second engaging unit is extended from the other side of the mirror mounting unit 1260440 and has a second opening. The second opening has a second engaging portion at the periphery. The mirror is provided with an opening, and the first opening and the second opening communicate with each other to naturally form an angle. The lens set of the present invention comprises a folding pedestal, a first lens group, a second lens group and a mirror. The bending base includes a mirror mounting unit, a first engaging unit and a second engaging unit. The structure of the bent base is the same as described above, and therefore will not be described herein. In the lens group, the mirror is mounted on the mirror mounting opening of the mirror mounting unit, and the first lens group and the second lens group are respectively assembled to the first joint portion and the second joint portion. As described above, since the lens group and the bending base of the present invention have the characteristics of a small number of parts and are not required to be fixed in a plurality of places by screws, the assembly of the conventional mirror assembly unit can be eliminated. The process is cumbersome and difficult, and the cost per day and the non-performing rate can be reduced. Moreover, the assembly process is simple: the uncertainty factor of accuracy can also be effectively eliminated, thereby improving the accuracy of the heart and achieving a better projection effect. [Embodiment] Referring to Figures 3 and 4, the group 3 includes a bending base 4, a sheet group 6, and a mirror 7. According to a preferred embodiment of the present invention, a first lens group 5 and a second lens, wherein the bending base 4 includes a mirror 1260440 mounting unit 41, a first engaging unit 42, and a second engaging unit. 43. The mirror mounting unit 41 has a mirror mounting opening 411 for mounting the mirror 7. The first engaging unit 42 is extended from one side of the mirror mounting unit 41 and has a first opening 421. The first opening 421 is provided with a first joint portion 4211 for classifying the first lens group 5. Installed. The second bonding unit 43 is extended from the other side of the mirror mounting unit 41 and has a second opening 431. The second opening 431 is provided with a second bonding portion 4311 for performing with the second lens group 6. Assembly. The mirror mounting opening 411, the first opening and the second opening 431 are in communication with each other to naturally form an angle 0. Since the 笫-the human element 43 is attached to the mirror loading unit 42 and the second joining unit assembly part Create red and private, up to = _, so you can exempt the past and improve the overall accuracy. Low work, cost, non-performing rate, first joint 4211 and second button-lens group 5 and second lens ° "M311 are respectively used to combine with the first-combination unit and the second: 6 reading In this embodiment, it may also be a card slot or a card block. The 311 series are respectively threaded. Of course, the bending base 4 of the present invention has been packaged and will not be described again. 3 is not limited to the lens group 3, so it is limited. The above-mentioned equivalent modifications and changes are merely exemplary, and are not intended to be the spirit and scope of the invention, and are included in the scope of the appended claims. Fig. 1 is a schematic view showing a cross-sectional view of various parts of a conventional lens group; Fig. 2 is a schematic view; Fig. 3 is a cross-sectional view showing the disassembly of each part; Fig. 4 is a schematic view showing the side of a conventional base View; showing a side view of a lens set and a seat in accordance with a preferred embodiment of the present invention. Component symbol description: 1 Rear projection lens set 11 Base 12 First receiving ring 13 Brother 1 a receiving ring 14 First lens group 15 Second lens group 16 Mirror 121 Screw hole 122 Screw hole 123 Screw hole 124 Screw hole 131 screw hole 132 screw hole 133 screw hole 134 screw hole display according to a preferred embodiment of the present invention, the bending base lens group bending base mirror mounting unit mirror mounting opening first joint unit first opening first combination Second engaging unit second opening second joint first lens group second lens group mirror 11