200909861 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種偏振光轉換器，尤其涉及一種應用於 液晶投影機之偏振㈣換ϋ及具有該偏振光轉換器之投影 系統。 【先前技術】 才又衫系統中一般利用偏振光轉換器（P〇larizati⑽BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization converter, and more particularly to a polarization system for a liquid crystal projector and a projection system having the same. [Prior Art] Polarized light converters are generally used in the shirt system (P〇larizati(10)
Con— System，PCS)對光路方向進行偏振轉換，偏振 先轉換器包括-玻璃基板’玻璃基板内形成有與玻璃基板 表面呈一定方向傾斜之（一般傾斜45度）偏振分光 (P〇lanzationBeam，PB)鍍膜，一般利用玻璃基板四側面形 成霧面以進行定位。於偏振光轉換器之使时，依靠玻璃 基板週邊四侧面之霧面來進行定位，使抑鐘膜面正確對位 到入射光之位置。 由於玻璃基板週邊之四側霧面係透過多重加工後形成 ，面’其與PB鍍膜面之垂直或平行度完全依靠後段加工 此力來完成’因此對位之準確度非常不穩HPB鑛膜 面與入射光對位不良，將嚴重影響通光效率。 【發明内容】 有鑒於此，有必要提供一種能準確對位且操作簡便之 振光轉換為及具有該偏振光轉換器之投影系統。 /種偏振光轉換H，其包括—玻璃基板，所述玻璃基 >成複數互相平行之第—偏振分光鐘膜面及複數互相 仃之第二偏振分光_面。所述偏振㈣換器還包括一 200909861 第:偏振分光鍵膜面平行之第-定位面及 旻數弟一偏振分光鍍膜面平行 於使所述複數第-偏振分光㈣而疋位面’分別用 光鑛膜面準確對位到人射光:位置。相數第二偏振分 、嶋：投影ί統，其包括一光源及-偏振光轉換器。所 數互相平==包括—玻縣板，所述麵基板形成有複 :i:=r偏振分光鍍膜面及複數互相平行之第二 第所述偏振光轉換器還包括-與所述複數 一傯捃八土# * 弟疋位面及—與所述複數第 面平：之第二定位面。光源之光線經所述 v 、g之複數第—偏振分光鐘膜面及複數第-偏# 分光鍍膜面後轉換為同—方向偏振光。-數弟-偏振 技術，料之偏振光轉㈣㈣與偏振光 =二:分光鍍膜平行之原始切割面進行光源光線之 ^ *保料振純換^之偏振分光面正確對位到光線 入射光位置，操作簡便，定位準確。 【實施方式】 明面將、、°α附圖對本發明實施例作進一步之詳細說 〇關1’其為本發明第—實施例之偏振光轉換器 。偏振光轉換器4〇包括—玻璃基板42、形成在玻璃基 反二之複數互相平行之第—ΡΒ鍍膜面44a、複數互相平行 之第二PB鍍膜面44b、複數半波片46、—第一定位面48 200909861 及一第二定位面49。 本實施例中，偏振光轉換器40設有四個第一 PB鍍膜 面44a、四個第二PB鍵膜面44b，每一第一 PB鍍膜面44a 與每一第二PB鍍膜面44b互相平行。可以理解，玻璃基 板42可利用分別具有第一 PB鍍膜面44a之玻璃基板及包 括第二PB鍍膜面44b之玻璃基板黏貼形成，也可以為一 具有第一 PB鍍膜面44a與第二PB鍍膜面44b之玻璃基 板。本實施例中，偏振光轉換器40還設有四個半波片46， 其中每一半波片46間隔黏貼於相鄰之PB鍍膜面間之玻璃 基板42之表面。優選地，每一第一 PB鍍膜面44a及每一 第二PB鍍膜面44b均與玻璃基板42表面傾斜45度設置。 所述第一定位面48與所述第二定位面49互相平行且 分別形成於玻璃基板42之兩侧面，第一定位面48及第二 定位面49均與每一第一 PB鍍膜面44a及第二PB鍍膜面 44b互相平行。 利用霧面進行定位時，由於霧面經過多重加工形成， 霧面之平行度及垂直度難以保證準確，從而造成各第一 PB 鍍膜面44a及第二PB鍍膜面44b無法準確對位到入射光 之位置，無法使偏振光轉換器40將自然光全部轉變為 s(s-polarized light)偏振光。於製作偏振光轉換器40時，玻 璃基板42之兩侧分別沿平行於第一 PB鍍膜面44a及第二 PB鍍膜面44b之方向形成第一定位面48及第二定位面 49，操作簡便。且第一定位面48及第二定位面49均與每 一第一 PB鍍膜面44a及第二PB鍍膜面44b互相平行，能 200909861 .使第一 PB鍍膜面44a及第二PB鍍膜面44b準確對位到入 射光之位置，進而使半波片46能準確對位到入射光之位 置。使偏振光轉換器40透射自然光中之p偏振光 (p polarized light)、反射s偏振光。p偏振光自偏振光轉換 器40透射後進入半波片46，並轉變為s偏振光射出。$偏 振光在偏振光轉換器40内經兩次反射後由偏振光轉換器 4〇未設半波片46之部分射出’從而將入射之自然光全； 轉變為s偏振光。 請參閱目2,纟為本發明第二實施例之偏振光轉換哭 6〇。所述偏振光轉換n 60包括一玻璃基板62、複數互相 平行之第一 PB鍍膜面64a、複數互相平行之第二pB鍍膜 面64b，设數半波片66、一第一定位面砧及—第二定位面 本實施例中，偏振光轉換器6〇設置四個互相平行之第 一 PB鍍膜面64a及四個互相平行之第二四鑛膜面糾， ㈣膜面64a分別與四個第二pB鍵膜面6仆車由 對％ δ又置。優選地，每一第一 pB鍍膜面6如及每一第二 鍍膜面64b均鱼破域其;^ 土工/s ^ j ”敬喁丞板62表面傾斜45度設置。與對 稱軸相鄰之第一 PB鍍膜面64a、笸-rm &』 々 數联囬043弟一PB鍍臈面04b及對 稱軸之交點位於玻璃基板62之表面。 —本實施例中，偏振光轉換器、6〇設置四個半波片％ 每—半波片66間隔黏貼於相鄰之第—ρβ錄膜面仏間 玻璃基板62之表面及相鄰之第二pB鍵膜面⑽間之破 基板62之表面。所述第位φ 68及所述第二定位面· 10 200909861 原始切割時形成於玻璃基板62之兩侧面，第一定位面68 及第二定位面69對稱設置且分別平行於相對應之第— 鍍膜面64a及第二pb鍍膜面64b。 ^於製作偏振光轉換器6〇時，玻璃基板62之兩侧分別 沿平行於第一 PB鍍膜面64a及第二PB鍍膜面6仆之方向 形成第一定位面68及第二定位面69，操作簡便。第—定 位面68與第二定位面69能使各第—pB鍍膜面64a及第 二PB鍍膜面64b準確對位到入射光之位置，進而使半波 片66能準確對位到入射光之位置。從而將入射之自然光全 部轉變為s偏振光。 明麥閱圖3，其為本發明第三實施例之偏振光轉換器 70。其與第二實施例之偏振光轉換器6〇結構基本相同，不 同之處在於與對稱軸相鄰之第一 PB鍍膜面、第二鍍膜 面及對稱軸之交點位置不同。所述偏振.光轉換器包括一 玻螭基板72、.複數互相平行之第一 pB鍍膜面74a、複數Con-System, PCS) Polarizes the direction of the optical path. The polarization-precision converter includes a glass substrate. The glass substrate is formed with a polarization beam splitting (typically inclined by 45 degrees) in a certain direction with respect to the surface of the glass substrate (P〇lanzationBeam, PB). Coating, generally using the four sides of the glass substrate to form a matte surface for positioning. When the polarizing converter is used, it is positioned by the matte side of the four sides of the glass substrate, so that the film surface is correctly aligned to the position of the incident light. Since the four sides of the glass substrate are formed by multiple processing, the vertical or parallelism of the surface with the PB coating surface is completely dependent on the processing of the back section. Therefore, the accuracy of the alignment is very unstable. Poor alignment with incident light will seriously affect the efficiency of light. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a projection system capable of accurately aligning and easily operating, and having a projection system having the polarization converter. A polarized light conversion H comprising a glass substrate, the glass substrate > a plurality of mutually parallel first-polarization splitting film faces and a plurality of mutually polarized second polarization splitting faces. The polarization (four) converter further includes a 200909861 first: a polarization-dispersing bond film surface parallel to the first positioning surface and a number of polarization-polarization coating surface parallel to the plurality of first-polarization splitting (four) and the clamping surface 'respectively The ore film surface is accurately aligned to the person's light: position. The phase second polarization component, 嶋: projection system, includes a light source and a polarization converter. The number is flat with each other == including - glass plate, the surface substrate is formed with a complex: i:=r polarization beam splitting coating surface and a plurality of second parallel polarization converters further comprising - and said plural A 偬捃八土# * 疋 疋 面 and - and the plural 面面: the second positioning surface. The light of the light source is converted into the same-direction polarized light by the plurality of first-polarized splitting film faces and the plurality of first-biased splitting film faces of v and g. -Digital-polarization technology, the polarization of the material is turned (4) (4) and the polarized light = 2: the original cutting surface parallel to the spectroscopic coating is used to make the light of the source light. * The polarization of the polarization is correctly aligned to the position of the incident light. Easy to operate and accurate positioning. [Embodiment] The present invention will be further described in detail with reference to the accompanying drawings, and is a polarization converter of the first embodiment of the present invention. The polarization converter 4A includes a glass substrate 42, a first-side coating surface 44a formed parallel to the plurality of glass bases, a second PB coating surface 44b parallel to each other, a plurality of half-wave plates 46, and a first The positioning surface 48 200909861 and a second positioning surface 49. In this embodiment, the polarization converter 40 is provided with four first PB coating surfaces 44a and four second PB bonding surfaces 44b. Each of the first PB coating surfaces 44a and each of the second PB coating surfaces 44b are parallel to each other. . It can be understood that the glass substrate 42 can be formed by using a glass substrate having a first PB coated surface 44a and a glass substrate including a second PB coated surface 44b, or a first PB coated surface 44a and a second PB coated surface. 44b glass substrate. In this embodiment, the polarization converter 40 is further provided with four half-wave plates 46, wherein each of the half-wave plates 46 is adhesively adhered to the surface of the glass substrate 42 between adjacent PB coating surfaces. Preferably, each of the first PB coated surface 44a and each of the second PB coated surfaces 44b are disposed at an angle of 45 degrees to the surface of the glass substrate 42. The first positioning surface 48 and the second positioning surface 49 are parallel to each other and are respectively formed on two sides of the glass substrate 42. The first positioning surface 48 and the second positioning surface 49 are respectively associated with each of the first PB coating surfaces 44a and The second PB plating faces 44b are parallel to each other. When the matte surface is used for positioning, since the matte surface is formed by multiple processing, it is difficult to ensure the parallelism and the perpendicularity of the matte surface, so that the first PB coating surface 44a and the second PB coating surface 44b cannot be accurately aligned to the incident light. At this position, the polarization converter 40 cannot be made to convert all of the natural light into s (polarized light) s. When the polarization converter 40 is fabricated, the first positioning surface 48 and the second positioning surface 49 are formed on both sides of the glass substrate 42 in a direction parallel to the first PB plating surface 44a and the second PB plating surface 44b, which is easy to operate. The first positioning surface 48 and the second positioning surface 49 are parallel to each of the first PB coating surface 44a and the second PB coating surface 44b, and can be used for 200909861. The first PB coating surface 44a and the second PB coating surface 44b are accurate. The position is aligned to the incident light, so that the half-wave plate 46 can be accurately aligned to the position of the incident light. The polarization converter 40 is caused to transmit p-polarized light (p polarized light) and reflect s-polarized light in natural light. The p-polarized light is transmitted from the polarization converter 40 into the half-wave plate 46 and converted into s-polarized light. The polarized light is reflected twice in the polarization converter 40 and then emitted by the polarization converter 4 〇 without the portion of the half-wave plate 46 to convert the incident natural light into s-polarized light. Please refer to item 2, 哭 for the polarization conversion of the second embodiment of the present invention. The polarization conversion n 60 includes a glass substrate 62, a plurality of first PB coating surfaces 64a parallel to each other, a plurality of second pB coating surfaces 64b parallel to each other, a plurality of half wave plates 66, a first positioning surface anvil and Second locating surface In the embodiment, the polarization converter 6 〇 is provided with four mutually parallel first PB coating surfaces 64a and four mutually parallel second four ore films, and (4) film faces 64a and four The two pB bond film surface 6 servant is set again by the pair δ. Preferably, each of the first pB coated surfaces 6 and each of the second coated surfaces 64b are broken; the geotechnical / s ^ j "the surface of the godly board 62 is inclined by 45 degrees. Adjacent to the axis of symmetry The intersection of the first PB coating surface 64a, the 笸-rm & 々 々 043 043 043 一 P P P P P P P and the axis of symmetry is located on the surface of the glass substrate 62. - In this embodiment, the polarization converter, 6 〇 Four half-wave plates % are disposed. Each of the half-wave plates 66 is adhesively adhered to the surface of the adjacent substrate πβ-film surface inter-turn glass substrate 62 and the surface of the broken substrate 62 between the adjacent second pB key film faces (10). The first position φ 68 and the second positioning surface 10 200909861 are formed on both sides of the glass substrate 62 during the original cutting, and the first positioning surface 68 and the second positioning surface 69 are symmetrically disposed and respectively parallel to the corresponding first— The plating surface 64a and the second pb plating surface 64b. When the polarizing converter 6 is fabricated, the two sides of the glass substrate 62 are formed in a direction parallel to the first PB plating surface 64a and the second PB plating surface 6 respectively. A positioning surface 68 and a second positioning surface 69 are easy to operate. The first positioning surface 68 and the second positioning surface 69 enable each The pB coated surface 64a and the second PB coated surface 64b are accurately aligned to the position of the incident light, so that the half-wave plate 66 can be accurately aligned to the position of the incident light, thereby converting the incident natural light into s-polarized light. Fig. 3 is a polarization converter 70 according to a third embodiment of the present invention, which is basically identical in structure to the polarization converter 6〇 of the second embodiment, except that the first PB adjacent to the axis of symmetry The position of the intersection of the coating surface, the second coating surface and the axis of symmetry is different. The polarization-converting converter comprises a glass substrate 72, a plurality of first pB coating surfaces 74a parallel to each other, and a plurality
互相平行之第二PB鍍膜面74b。與對稱軸相鄰之第一 pB 鍍膜面74a、第二PB鍍膜面7仆及對稱軸之交點位於玻璃 基板7 2之外部。 請一併參閱圖4及圖5 ,其為本發明第四實施例之偏 振光轉換器80。所述偏振光轉換器8〇包括—破璃基板82、 複數第一 PB鍍膜面84a、複數第二pB鍍膜面8仆、複數 半波片86、一棱鏡87、一第一定位面85 2及一第二定位面 854。 — 本實施例中，偏振光轉換器8〇設置四個第一 pB鍍膜 11 200909861 面84a及四個第二面PB鍍膜844,每一第一 PB鍍膜面84a 互相平行，每一第二PB鍍膜面84b互相平行。每一第一 PB鍍膜面84a分別與每一第二PB鍍膜面84b關於棱鏡87 之軸對稱設置。 本實施例中，偏振光轉換器80設置四個半波片86， 每一個半波片86間隔黏貼於相鄰之第一 PB鍍膜面84a間 之玻璃基板82之表面及相鄰之第二PB鍍膜面84b間之玻 璃基板82之表面。 所述第一定位面852與每一第一 PB鍍膜面84a平行， 所述第二定位面854與每一第二PB鍍膜面84b平行。第 一定位面852包括一黏貼部8522及兩定位部882、884， 所述兩定位部882、884沿黏貼部8522對稱設置。第二定 位面854包括一黏貼部8542及兩定位部'892、894，所述 兩定位部892、894沿黏貼部8542對稱設置。 所述棱鏡87之兩表面分別與第一定位面852之黏貼部 8522及第二定位面854之黏貼部8542相黏貼連接，用以 將具有第一 PB鍍膜面84a及半波片86之玻璃基板與具有 第二PB鍍膜面84b及半波片86之玻璃基板連接形成偏振 光轉換器80。可以理解，棱鏡87之高度不影響偏振光轉 換器80之光線偏振即可，棱鏡87之高度可與偏振光轉換 器80之高度相同，也可不相同。本實施例中，棱鏡87之 高度與偏振光轉換器80之高度相同。 於製作偏振光轉換器80時，玻璃基板82之定位部 882、884及定位部892、894分別沿平行於第一 PB鍍膜面 12 200909861 84a及第）PB鑛膜面84b之方向形成，操作簡便。定㈣ 882、884及定位部892、894能使各第一抑鍍膜面8心 及第二PB鍍膜面84b準確對位到入射光之位置，進而使 半波片86能準確對位到入射光之位置。從而將入射之自然 光全部轉變為s偏振光。 … 請參閱圖6,其為一投影系統1〇〇，其具有第—實施例 之偏振光轉換器40。所述投影系統1〇〇還包括—光源、 一紫外-紅外（Ultraviolet-Infrared, UV_IR)濾鏡 2〇及兩微鏡 陣列22。所述UV_IR濾鏡2〇、所述兩微鏡陣列22及所述 偏振光轉換器40依次沿光源10之光線光路方向設置。優 選地，可於兩微鏡陣列22間設置一反光鏡24改變光路^ 縮小投影系統100之尺寸。另外，投影系統1〇〇還包括積 分柱、成像裝置及投影鏡頭等。 UV-IR濾鏡2〇濾掉光源1〇射出之光線中之紫外光及 红外光’避免紫外光及紅外光降低成像品質。 光源10之光線從光源射出後’經UV-IR濾鏡20濾掉 光線中之紫外光與紅外光，然後光線經兩微鏡陣列22、所 述反光鏡24不連續地會聚於偏振光轉換器4〇之玻璃基板 42 ’第一定位面48與第二定位面49能使各第一 pB鍍膜 面44a及第二pb錄膜面44b準確對位到入射光之位置， 進而使半波片46能準確對位到入射光之位置。使偏振光轉 換器40將入射之自然光全部轉變為s偏振光。且第一定位 面48與第二定位面49能於製作偏振光轉換器4〇之原始切 割步驟時形成，操作簡便。 13 200909861 可以理解，所述投影系統100中之偏振光轉換器 .也可為第二實施例之偏振光轉換器60。利用偏振光轉換器 60之第一定位面68及第二定位面69使每一半波片66、每 一第一 PB鍍膜面64a及第二PB鍍膜面6仆之反射面正確 對位到入射光之位置，使偏振光轉換器6〇將入射之自缺 全部轉變為s偏振光。 可以理解，所述投影系統100中之偏振光轉換器4〇 也可為第三實施例之偏振光轉換器8〇。利用 ⑽之定位部882、—、δ94使每—半波片二二 第:ΡΒ鍍膜面84a及每一第二ΡΒ鍍膜面8仆之反射面正 確對位到入射光之位置’使偏振光轉換器將入射之自然 光全部轉變為s偏振光。 上述實施射，每m统之偏振光轉換器利用與 偏振光轉換器:之PB鍍膜平粁 肤十订之原始切割面.進行光路定 值’保證偏振光轉換器上各半波只 子干及月及PB反射面正確對位 到入射光之位置，操作簡便’定位準確。 綜上所述’本發明確已符合 仃。士明專利之要件，麦依法 提出專利申請。惟，以上 7I者僅為本發明之較佳實施方 式’本發明之範圍並不以上述膏 ^ 上迷只知方式為限，舉凡熟悉本 系技藝之人士援依本發明之籍妯 bt m ^ 月神所作之#效修飾或變化， 白應涵盍於以下申請專利範圍内。 圖式簡單說明；] 器示意圖 器示意圖 圖1為本發明第L!之偏振光轉換 圖2為本發明第二實施例之偏振光轉換 14 200909861 圖3為本發明第三實施例之偏振光轉換器示意圖。 圖4為本發明第四實施例之偏振光轉換器示意圖。 圖5為圖4之偏振光轉換器之立體示意圖。 圖6為應用圖1之偏振光轉換器之投影系統示意圖。 【主要元件符號說明】 偏振光轉換器 40、 60、 玻璃基板 42, 62、 70、80 12、 82 第一偏振分光44a、64a、 第二偏振分44b 、64b、 鍍膜面 74a、 84a 光鍍膜面 74b 、84b 半波片 46n 66、86 第一定位面 48、 68、 852 第二定位面 49、69、854 稜鏡 87 黏貼部 8522、 8542 定位部 882 、884、 892 、894 投影系統 100 光源 10 紫外-紅外濾鏡20 微鏡阵列 22 . 反光鏡 24 15The second PB coating surface 74b parallel to each other. The intersection of the first pB coated surface 74a adjacent to the axis of symmetry, the second PB coated surface 7 and the axis of symmetry is located outside the glass substrate 72. Referring to Figures 4 and 5 together, a polarization converter 80 according to a fourth embodiment of the present invention is shown. The polarization converter 8A includes a glass substrate 82, a plurality of first PB coating surfaces 84a, a plurality of second pB coating surfaces 8, a plurality of half-wave plates 86, a prism 87, a first positioning surface 85 2 and A second positioning surface 854. In this embodiment, the polarization converter 8 is provided with four first pB coatings 11 200909861 surface 84a and four second surface PB coatings 844, each of the first PB coating surfaces 84a being parallel to each other, and each second PB coating The faces 84b are parallel to each other. Each of the first PB coated faces 84a is disposed symmetrically with respect to the axis of each of the second PB coated faces 84b with respect to the prism 87. In this embodiment, the polarization converter 80 is provided with four half-wave plates 86, and each of the half-wave plates 86 is adhesively adhered to the surface of the glass substrate 82 between the adjacent first PB coating surfaces 84a and the adjacent second PB. The surface of the glass substrate 82 between the coated surfaces 84b. The first positioning surface 852 is parallel to each of the first PB coating surfaces 84a, and the second positioning surface 854 is parallel to each of the second PB coating surfaces 84b. The first positioning surface 852 includes an adhesive portion 8522 and two positioning portions 882 and 884. The two positioning portions 882 and 884 are symmetrically disposed along the adhesive portion 8522. The second positioning surface 854 includes an adhesive portion 8542 and two positioning portions '892, 894. The two positioning portions 892 and 894 are symmetrically disposed along the adhesive portion 8542. The two surfaces of the prism 87 are respectively adhered to the adhesive portion 8522 of the first positioning surface 852 and the adhesive portion 8542 of the second positioning surface 854 for the glass substrate having the first PB coating surface 84a and the half wave plate 86. The polarizing converter 80 is formed by being connected to a glass substrate having the second PB plating surface 84b and the half-wave plate 86. It can be understood that the height of the prism 87 does not affect the polarization of the light of the polarization converter 80. The height of the prism 87 may be the same as or different from the height of the polarization converter 80. In this embodiment, the height of the prism 87 is the same as the height of the polarization converter 80. When the polarization converter 80 is manufactured, the positioning portions 882 and 884 of the glass substrate 82 and the positioning portions 892 and 894 are respectively formed in a direction parallel to the first PB plating surface 12 200909861 84a and the PB mineral film surface 84b, which is easy to operate. . The (4) 882, 884 and the positioning portions 892 and 894 can accurately align the first plating film surface 8 and the second PB coating surface 84b to the position of the incident light, thereby enabling the half wave plate 86 to accurately align to the incident light. The location. Thereby, all incident natural light is converted into s-polarized light. Referring to Figure 6, there is shown a projection system 1A having a polarization converter 40 of the first embodiment. The projection system 1 further includes a light source, an Ultra-violet-Infrared (UV-IR) filter, and two micro-mirror arrays 22. The UV_IR filter 2, the two micromirror arrays 22, and the polarization converter 40 are sequentially disposed along the optical path of the light source 10. Preferably, a mirror 24 is provided between the two micromirror arrays 22 to change the size of the optical path reducing projection system 100. In addition, the projection system 1A further includes an integrating column, an imaging device, a projection lens, and the like. The UV-IR filter 2 〇 filters out the ultraviolet light and infrared light in the light emitted by the light source 1 to avoid ultraviolet light and infrared light to reduce the imaging quality. After the light of the light source 10 is emitted from the light source, the ultraviolet light and the infrared light in the light are filtered by the UV-IR filter 20, and then the light is continually concentrated on the polarization converter through the two micromirror arrays 22 and the mirror 24. The first positioning surface 48 and the second positioning surface 49 enable the first pB coating surface 44a and the second pb recording surface 44b to accurately align to the position of the incident light, thereby making the half wave plate 46 Can accurately align to the position of the incident light. The polarized light converter 40 is caused to convert all of the incident natural light into s-polarized light. Moreover, the first positioning surface 48 and the second positioning surface 49 can be formed when the original cutting step of the polarization converter 4 is formed, and the operation is simple. 13 200909861 It can be understood that the polarization converter in the projection system 100 can also be the polarization converter 60 of the second embodiment. The first positioning surface 68 and the second positioning surface 69 of the polarization converter 60 are used to correctly align the reflection surfaces of each of the half wave plates 66, the first PB coating surface 64a and the second PB coating surface 6 to the incident light. The position is such that the polarization converter 6 turns all of the incident self-deficiencies into s-polarized light. It can be understood that the polarization converter 4 in the projection system 100 can also be the polarization converter 8 of the third embodiment. Using the positioning portions 882, -, δ94 of (10), the per-wave plate 22: ΡΒ coating surface 84a and the reflecting surface of each second enamel coating surface 8 are correctly aligned to the position of the incident light to convert the polarization The device converts all incident natural light into s-polarized light. The above-mentioned implementation, each polarized light converter uses a polarized light converter: PB coating flat skin tanned ten original cutting surface. Perform optical path setting 'to ensure that each half wave on the polarized light converter is only dry and The month and the PB reflecting surface are correctly aligned to the position of the incident light, and the operation is simple and the positioning is accurate. In summary, the present invention has indeed been met. For the requirements of the Shiming patent, Mai filed a patent application. However, the above 7I is only a preferred embodiment of the present invention. The scope of the present invention is not limited to the above-mentioned method of the above-mentioned paste, and those skilled in the art can support the invention of the present invention bt m ^ The modification or change made by Luna, Bai Yinghan is within the scope of the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a polarization conversion of an Lth of the present invention. FIG. 2 is a polarization conversion 14 according to a second embodiment of the present invention. FIG. 3 is a polarization conversion of a third embodiment of the present invention. Schematic diagram. 4 is a schematic diagram of a polarization converter according to a fourth embodiment of the present invention. FIG. 5 is a perspective view of the polarization converter of FIG. 4. FIG. 6 is a schematic diagram of a projection system using the polarization converter of FIG. 1. [Description of main component symbols] Polarizing light converters 40, 60, glass substrates 42, 62, 70, 80 12, 82 First polarization splitting beams 44a, 64a, second polarization splits 44b, 64b, coating surfaces 74a, 84a 74b, 84b half wave plate 46n 66, 86 first positioning surface 48, 68, 852 second positioning surface 49, 69, 854 稜鏡 87 pasting portion 8522, 8542 positioning portion 882, 884, 892, 894 projection system 100 light source 10 UV-IR filter 20 micromirror array 22. Mirror 24 15