200918946 九、發明說明： 【發明所屬之技術領域】 本發明關於一種投影光學系統，尤其係一種具有立體 投影顯示功能之立體投影光學系統。 【先前技術】 近年來，圖像投影儀，尤其數位投影儀，作為向觀眾 顯示多種訊息之工具已經逐漸流行。一般，這些投影儀用 於將由電腦生成之圖像投影到螢幕上。對觀看者來說，圖 像投影儀投影之圖像通常看起來係平面二維圖像，除圖像 本身外無法顯示任何圖像景深訊息。這種顯示可以適用於 顯示多種訊息。但是，在某些情況下，觀看者希望能有比 二維顯示能夠更大程度地顯示圖像之景深或結構特徵之投 影儀。 使二維顯示之圖像能給出圖像景深之一種方式係通過 立體地顯示圖像。立體圖像，通常稱為“三維”或“3D” 圖像，在觀看者看來具有深度尺寸。這些圖像包括分開的、 疊合的左眼及右眼圖像，這些圖像設置成模仿人之左右眼 觀看時，由於人眼睛間隔引起之三維物體表面之微小差 別’而具有之景珠圖像。左眼及右眼圖像係這樣來顯不5 即觀看者之右眼看不到左眼圖像，左眼看不到右眼圖像。 這種顯示方式一般借助於觀看者佩戴之光學濾光鏡。 通常顯示立體圖像之方式係使用兩個分開之圖像投影 系統分別來投影左眼圖像及右眼圖像。而這種系統在成功 地用於形成立體圖像之同時，系統之成本和重量則比單個 7 200918946 投影儀要高很多。而且，兩個投影儀要求光學對準相對困 難並比較費時。還有，由於這兩個系統之重量及體積，使 這種系統在兩個位置之間移動起來特別困難，還有存在潛 在之圖像對準之問題。 【發明内容】 有鑒於此，有必要提供一種單個的能夠投影立體圖像 的立體投影光學系統。 一種立體投影光學系統，其包括沿光路依次設置之： 一偏振光轉換器，用於將入射光轉換成偏振狀態單一之 出射光； 一用於接收所述偏振光轉換器之出射光之分時輪，其包 括一反射所述偏振光轉換器之出射光之反射區，與一透射所 述偏振光轉換器之出射光之透射區，所述偏振光轉換器之出 射光照射在分時輪之反射區及透射區中之一個區上； 一偏振轉換元件，設置於分時輪之反射區及透射區中之 一個區之出射光之光路上； 一成像引擎，設置於分時輪與偏振轉換元件之出射光路 上，用於為該成像引擎之入射光載入圖像訊息，並發射載入 有圖像訊息之出射光。 與先前技術相比，上述立體投影光學系統使用時可通過 分時輪之旋轉，為數位微鏡元件交替輸入不同偏振狀態之 光，從而使得觀看者之左、右眼交替獲得不同偏振狀態之影 像，當該輸入訊號之頻率足夠快時，觀看者之左右眼分別戴 上檢偏方向相互垂直之兩片偏振片，就可以觀察到立體之圖 200918946 像訊息。 【實施方式】 描述:下面將結合附圖’舉以下較佳實施例並配合圖式詳細 请參閱圖1及圖2，為本發明第一實施例提供 立體投影线1QG之結構示意圖。該立體投影系統1〇〇勺 括沿光路依次設置之—光源組件u，置於光源組件=200918946 IX. Description of the Invention: [Technical Field] The present invention relates to a projection optical system, and more particularly to a stereoscopic projection optical system having a stereoscopic projection display function. [Prior Art] In recent years, image projectors, especially digital projectors, have become popular as tools for displaying a variety of messages to viewers. Typically, these projectors are used to project a computer generated image onto a screen. For the viewer, the image projected by the image projector usually looks like a flat two-dimensional image, and no image depth of field information can be displayed except the image itself. This display can be used to display a variety of messages. However, in some cases, the viewer desires to have a projector that can display the depth of field or structural features of the image to a greater extent than the two-dimensional display. One way to make an image of a two-dimensional display give an image depth of field is to display the image stereoscopically. Stereoscopic images, often referred to as "three-dimensional" or "3D" images, have a depth dimension to the viewer. These images include separate, superimposed left and right eye images that are set to mimic the tiny differences in the surface of a three-dimensional object caused by the spacing of the human eye when viewed from the left and right eyes of the person. image. The images of the left and right eyes are such that the left eye image is not visible to the right eye of the viewer, and the right eye image is not visible to the left eye. This type of display is generally by means of an optical filter worn by the viewer. The method of displaying a stereoscopic image is generally to project a left eye image and a right eye image using two separate image projection systems. While this system is successfully used to form stereoscopic images, the cost and weight of the system is much higher than that of a single 7 200918946 projector. Moreover, the two projectors require optical alignment to be relatively difficult and time consuming. Also, due to the weight and volume of the two systems, it is particularly difficult to move such a system between two locations, as well as the problem of potential image alignment. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a single stereoscopic projection optical system capable of projecting a stereoscopic image. A stereoscopic projection optical system comprising: sequentially arranged along an optical path: a polarization converter for converting incident light into a single emitted light of a polarization state; and a time division for receiving the outgoing light of the polarization converter a wheel comprising a reflection region for reflecting the outgoing light of the polarization converter, and a transmission region for transmitting the light emitted from the polarization converter, wherein the emitted light of the polarization converter is illuminated by the time division wheel a region of the reflective region and the transmissive region; a polarization conversion element disposed on the optical path of the outgoing light of one of the reflective and transmissive regions of the time-sharing wheel; an imaging engine disposed on the time-sharing wheel and the polarization conversion The outgoing light path of the component is used to load an image message for the incident light of the imaging engine and to emit the emitted light loaded with the image information. Compared with the prior art, the stereoscopic projection optical system can use the rotation of the time-sharing wheel to alternately input light of different polarization states for the digital micro-mirror elements, so that the left and right eyes of the viewer alternately obtain images of different polarization states. When the frequency of the input signal is fast enough, the viewer's left and right eyes respectively wear two polarizing plates whose detection directions are perpendicular to each other, and the stereoscopic image 200918946 image information can be observed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of the structure of a stereoscopic projection line 1QG according to a first embodiment of the present invention, with reference to the following preferred embodiments and the drawings. Referring to FIG. 1 and FIG. The stereoscopic projection system 1 includes a light source assembly u arranged in sequence along the optical path, and is placed in the light source component =
3 = 轉換器12 ’ 一用於接收所述偏振光轉換 光光路上之偏振轉換元件16,分別設置於所述分時 之出射光光路上之第__ 、 條出射 〇〇出射先之刀4輪13，一設置於分時輪13之 輪13 第二反射裝置14、15，一执里μ 所述第一、第-及舢壯 π置於 束器17 棱鏡18 ，二；反射袭i 14、15出射光之光路上之偏振分 °又置於偏振分束器17出射光路上之全内反射 設置於全内反射棱鏡18反射光之光路上 子微鏡元件19以及—投影鏡頭2〇。 需要說明的是，在本實施例中，由所述偏振分束器 17，全内反射棱鏡18以及數字微鏡元件19 起組成了 一成像引擎，其發射出載入有圖像訊息之光。 所述光源組件11包括依光路設置之一照明光源、 一色輪112以及一積分器113。所述照明光源lu發射包括 顯示彩色圖像所需之紅光(R)、綠光(G)及藍光(B)之白光。 該光源11可以為素燈、金屬鹵化物燈、氙燈或Led等。 在本實施例中，該光源11為鹵素燈。所述色輪112包括紅、 綠、藍三色區，其可在電機（圖未示）之帶動下高速旋轉， 9 200918946 以給投影光路配以各種色彩。所述積分器113用來均句化 及有效地使用光源11發出之光。 所述偏振轉換器（p_s C〇nverter)12之結構為在平板玻 璃上用真空蒸鍍之方法鍍上寬頻增透膜及介質增反膜，用 形成超細金屬光柵之反射膜圖案。當該超細金屬 效應，口2小於光波長之二分之—時，由於光之電磁波 過該光光柵方向垂直之偏振光分量能無阻礙地透 去。最後2與該光栅方向平行之偏振光分量則被反射回 膜，並鱼另金屬膜光栅基片之另-面均錢上增透 一另—片鍍有增透膜之相位波片叙梦 行之偏振光’從而構成該偏振轉換二反 器12可 = = ;?轉換器12後，該偏振轉換 D〇 偏振先，在本實施例中，該偏, 早-偏振狀態之S偏振光。 /偏振轉換益12輸出 所4分時輪13設置於料偏 路上’用於週期性地透射所述射光之光 所述分時㈣之結構為將—透明^^反射S偏振光。 個錢上對光反射之反射膜，而在另4^成兩個區，其中-透之透軸或者不鑛任何膜。該個區讀上可讓光穿 未不)之帶動下以固定頻率旋轉，A _13可以在-電機（圖 本實施例中，所述分時輪13包Μ解係可調的。在 12之出射光之反射區131，與—反射所述偏振轉換器 出射光之透射區132。偏振轉換器^所述偏振轉換器12之 ° 2出射之S偏振光在同 2009189463 = a converter 12' is used to receive the polarization conversion element 16 on the optically-converted optical beam path, and is respectively disposed on the optical path of the time-division outgoing light, and the first exiting knife 4 The wheel 13 is disposed on the wheel 13 of the time-sharing wheel 13 and the second reflecting means 14, 15 are arranged. The first, the first and the third are placed in the beamer 17 prism 18, and the reflection is i 14 The polarization of the light path of the 15 outgoing light is again placed on the optical path of the polarizing beam splitter 17 and the total internal reflection is disposed on the optical path of the reflected light of the total internal reflection prism 18, and the projection lens 2 is projected. It should be noted that, in the present embodiment, the polarization beam splitter 17, the total internal reflection prism 18, and the digital micromirror device 19 constitute an imaging engine that emits light loaded with an image message. The light source assembly 11 includes an illumination source, a color wheel 112, and an integrator 113 disposed along the optical path. The illumination source lu emits white light including red (R), green (G), and blue (B) required to display a color image. The light source 11 may be a plain lamp, a metal halide lamp, a xenon lamp or a Led or the like. In this embodiment, the light source 11 is a halogen lamp. The color wheel 112 includes red, green, and blue color regions that can be rotated at a high speed by a motor (not shown), 9 200918946 to match the projection light path with various colors. The integrator 113 is used to uniformly and effectively use the light emitted by the light source 11. The polarization converter (p_s C〇nverter) 12 has a structure in which a broadband antireflection film and a dielectric antireflection film are plated on a flat glass by vacuum evaporation to form a reflective film pattern of an ultrafine metal grating. When the ultrafine metal effect is that the port 2 is smaller than two-half of the wavelength of the light, the polarized light component perpendicular to the direction of the light grating can be unimpeded due to the electromagnetic wave of the light. The last 2 polarized light components parallel to the grating direction are reflected back to the film, and the other side of the fish metal film grating substrate is uniformly permeable to the other surface - the phase wave plate coated with the antireflection film The polarized light 'and thus the polarization converting flip-flop 12 can be ==;? After the converter 12, the polarization is converted to D 〇 polarization, in this embodiment, the S-polarized light of the biased, early-polarized state. / polarization conversion benefit 12 output 4 minutes time wheel 13 is set on the material offset 'for periodically transmitting the light of the light. The time division (4) is structured to reflect - S-polarized light. The money reflects the reflective film on the light, and in the other two areas, in which - through the shaft or not any film. The reading of the zone can be carried out at a fixed frequency, and the A_13 can be in the motor (in the embodiment of the present invention, the time-sharing wheel 13 is adjustable). a reflection region 131 for emitting light, and a reflection region 132 for reflecting the light emitted from the polarization converter. The polarization converter 220 of the polarization converter 12 emits S-polarized light in the same manner as 200918946
:時射在反射區131及透射區132之其中-個區 射^，如^光照射在反射區131上時，該s偏振光被反 "1所示。當該S偏振光照射在透射區132上 ， 、過該分時輪13，如圖2所示。在該分時_ 13 U 轉時，該-振光便交替被所述分= 八厂第、第二反射裝置14、15可以為一種反射鏡， 述所述分時輪13反射或透射出去之= 時於13;之山文分時輪13出射之S偏振光之光路，以將該分 ^ 之出射光耦合到偏振分束器17中。 合成^述偏振分束器17用於將來自分時輪13之出射光復 :,-個方向之光束。該偏振分束器17可以為金屬柵格型 :偏益（wlre Grid Polarizer ’簡稱WGp檢偏器），也可以為 振分光棱鏡’在本實施例中，該偏振分束器17為偏振分 光棱鏡。該偏振分束器17根據對S偏振光及p偏振光之作 用不同，可以分為反射S偏振光而透過p偏振光，與透過 S偏振光而反射P偏振光兩種形式。在本實施例中，所述 偏振分束器17反射S偏振光，而可以讓p偏振光透過。 所述偏振轉換元件16設置於所述偏振分束器π與分 吩輪13之間之一條光路上，用於將分時輪13反射之3偏 振光或透射之S偏振光轉換為P偏振光。在本實施例中， 該偏振轉換元件16設置於分時輪13反射之s偏振光之光 路上以將該S偏振光轉換為P偏振光。 所述全内反射棱鏡（Total Internal Reflecti〇n Prism， 11 200918946 TIR；)18用玻，或透明樹脂製成，利用光之全反射原理，使 入f光在疋人射角度範圍内全部反射，而在其他入射角 度範圍内A射切透過該全内反射棱鏡U。該全内反射 棱，18。設置於偏振分束器17之出射光之光路上，其將偏 一束w之出射之S偏振光或P偏振光耦合到數位微鏡 元件19上。 所述數位微鏡元件(Digital Mim>r Device，DMD)19 係 用石夕作基底’並用大型積體電路技術切#絲上製出複 數》己隐體母個兄憶體有兩條定址電極（AddressingWhen the light is irradiated on the reflective area 131, the s-polarized light is reflected by the inverse "1 when it is incident on the reflection area 131 and the transmission area 132. When the S-polarized light is irradiated on the transmissive area 132, the time-sharing wheel 13 passes, as shown in FIG. During the time-sharing _ 13 U revolution, the illuminating light is alternately divided into the sub-eighth and the second reflecting means 14, 15 may be a kind of mirror, and the time-sharing wheel 13 is reflected or transmitted. The light path of the S-polarized light exiting the time wheel 13 is coupled to the polarizing beam splitter 17 by the outgoing light of the minute. The polarization beam splitter 17 is used to combine the outgoing light from the time-sharing wheel 13 into a light beam in one direction. The polarizing beam splitter 17 may be of a metal grid type: a wrre Grid Polarizer (hereinafter referred to as a WGp analyzer) or a vibrating prism. In the present embodiment, the polarizing beam splitter 17 is a polarization beam splitting prism. . The polarizing beam splitter 17 can be classified into two types: reflecting S-polarized light and transmitting p-polarized light, and transmitting S-polarized light and reflecting P-polarized light, depending on the effects of S-polarized light and p-polarized light. In the present embodiment, the polarization beam splitter 17 reflects the S-polarized light and allows the p-polarized light to pass therethrough. The polarization conversion element 16 is disposed on one of the optical paths between the polarization beam splitter π and the minute wheel 13 for converting the 3-polarized light or the transmitted S-polarized light reflected by the time-sharing wheel 13 into P-polarized light. . In the present embodiment, the polarization conversion element 16 is disposed on the optical path of the s-polarized light reflected by the time-sharing wheel 13 to convert the S-polarized light into P-polarized light. The total internal reflection prism (Total Internal Reflecti Prism, 11 200918946 TIR;) 18 is made of glass or transparent resin, and uses the principle of total reflection of light to reflect all of the incident light in the range of the human incidence angle. In the other incident angle range, A is cut through the total internal reflection prism U. The total internal reflection rib, 18. The optical path of the outgoing light of the polarization beam splitter 17 is coupled to the S-polarized light or the P-polarized light which is emitted from the partial beam w to the digital micromirror element 19. The digital micromirror device (Digital Mim>r Device, DMD) 19 is made of Shishi as the base substrate and is cut by a large integrated circuit technology to produce a complex number on the wire. The hidden body has two address electrodes ( Addressing
Electrodes)及兩個搭接電極(Lan(jing Electrodes)。再在基底 上設置兩個支撐柱，通過臂梁鉸鏈(t〇rsi〇n Hinge)安裝一微 形反射鏡’從而形成一微鏡單元。工作時，由視頻訊號驅 動’並根據入射光與光學系統光轴之夹角，利用兩定址電 極之差動電壓使反射鏡繞臂梁旋轉直到觸及搭接電極，從 而決定一微鏡單元之開關，以載入圖像訊息。該數位微鏡 元件19設置於全内反射棱鏡18之反射光之光路上。經數 位微鏡元件19載入有圖像訊息後，所述S偏振光或P偏振 光透射過該全内反射棱鏡18到達投影鏡頭20。 所述投影鏡頭20設置於所述全内反射棱鏡18之出射 光路上，用於將出射光所形成之圖像放大，並將放大之圖 像投影到螢幕（圖未示）上。 可以理解的是，為了進一步提高系統之對比度，還可 以在上述之立體投影光學系統中加入複數檢偏器201，該 檢偏器201可以為一偏光片。如圖3所示’該檢偏器201 200918946 可以讓-定偏振方向之光通過，而吸收其他偏振方向之 光，例如讓p偏振光通過，而吸㈣偏振光或者讓s偏振 光通過’而吸收P偏振光。該複數檢偏器2〇1之具體之放 置位置可以為沿光路之偏振分束器17 射裝置14、15則一或/與第二反縣= 時輪13之間。在本實施例中在第_、第二反射裝置^ 15與偏振分束器17之間設置有檢偏器2〇1。 …圖4及圖5為本發明第二實施例提供之立體投影光段 系統200之結構示意圖。該立體投影光學系统2〇〇包括= 光路依次設置之-光源組件21，-設置於光源给件η〜 出射光之偏振光轉換H 22,-用於接收所述偏振光轉換= 之出射光之分時輪23，一設置於分時輪23之—條、為 光路上之偏振轉換元件24,分別設置於所述分時^出射光 射光之光路上之第一數字微鏡元件25及第二^字出 件26各一個，分別設置於第一、第二數字微鏡元件=兀Electrodes) and two lap electrodes (Lan (jing Electrodes). Two support columns are placed on the substrate, and a micro-mirror is mounted by the arm beam hinge (t〇rsi〇n Hinge) to form a micro-mirror unit. When working, it is driven by the video signal' and according to the angle between the incident light and the optical axis of the optical system, the differential voltage of the two addressed electrodes is used to rotate the mirror around the arm beam until the overlapping electrode is touched, thereby determining a micromirror unit. Switching to load an image message. The digital micromirror element 19 is disposed on the optical path of the reflected light of the total internal reflection prism 18. After the digital micromirror element 19 is loaded with an image message, the S-polarized light or P The polarized light is transmitted through the total internal reflection prism 18 to reach the projection lens 20. The projection lens 20 is disposed on an outgoing light path of the total internal reflection prism 18 for amplifying an image formed by the emitted light, and is amplified. The image is projected onto a screen (not shown). It can be understood that in order to further improve the contrast of the system, a plurality of analyzers 201 can be added to the above-mentioned stereoscopic projection optical system, and the analyzer 201 can be a Light sheet. As shown in Fig. 3, the analyzer 201 200918946 can pass light of a certain polarization direction, and absorb light of other polarization directions, for example, let p-polarized light pass, and absorb (four) polarized light or let s polarized light. The P-polarized light is absorbed by '. The specific placement position of the complex analyzer 2〇1 may be the polarization beam splitter 17 along the optical path, the device 14, 15 or the second counter county = the hour wheel 13 In the present embodiment, an analyzer 2〇1 is disposed between the first and second reflecting devices 15 and the polarization beam splitter 17. FIG. 4 and FIG. 5 are three-dimensional embodiments of the second embodiment of the present invention. A schematic diagram of the structure of the projection optical section system 200. The stereoscopic projection optical system 2 includes a light source assembly 21, which is disposed in sequence with the optical path, and a polarized light conversion H22, which is disposed on the light source providing member η~, and is used for receiving The time-sharing wheel 23 of the polarized light conversion=exit light, a strip disposed on the time-sharing wheel 23, and the polarization conversion element 24 on the optical path are respectively disposed on the optical path of the time-division light emission light One of the digital micromirror device 25 and the second ^ word output member 26 are respectively disposed in the first and the third Two digital micromirror components = 兀
26與分時輪23的光路之間的全内反射棱鏡27、ο© > 各—個， 兩個分別設置於全内反射棱鏡27、28與分時輪23之門之 反射裴置31，一設置於第一、第二數字微鏡元件25 : % 之出射光路上之光複合器29以及一設置於所述光複人器 29之出射光路上之投影鏡頭30。 σ ° 第一實施例與第二實施例之不同在於成像弓丨擎之組成 部分不同。在該第二實施例中，由所述第一、第二數字微 鏡元件25、26，第一、第二全内反射棱鏡27、28以及光 複合器29 —起組成了成像引擎，其發射出载入有圖像訊幸、 13 200918946 之光。 所述光源組件21，偏振光轉換器22，分時輪23，偏 振轉換元件24以及反射裝置31之結構、工作原理以及光 的傳播絡徑與第一實施例相同，在此不再贅述。 所述第一、第二數字微鏡元件25、26之結構及工作原 理與第〆實施例之數字微鏡元件19相同’以此也不再贅 述。該第一數字微鏡元件25設置於分時輪23反射之s偏 振光之光路上’並發射載入有圖像訊息之s偏振光，如圖 4所示。所述第二數位微鏡元件26設置於分時輪13透射 之並經偏振轉換元件24轉換後之P偏振光之光路上，同第 一數位微鏡元件25，發射載入有圖像訊息之P偏振光，如 圖5所示。 所述第一全内反射棱鏡27設置於第一數字微鏡元件 25與分時輪23之光路之間，以將分時輪23反射之s偏振 光輛合到弟一數子微鏡元件25上’並且使第一數位微鏡元 件13發射之載入有圖像訊息之S偏振光透射過該第一全内 反射棱鏡27到達光複合器29。 同理’第二全内反射鏡28設置於第二數位微鏡元件 26與分時輪23之光路之間，以將分時輪23透射之並經偏 振轉換元件24轉換後之P偏振光耦合到第二數位微鏡元件 26上’並且使第二數位微鏡元件26發射之載入有圖像訊 4之P偏振光透射過該第二全内反射棱鏡28到達光複合器 29 ° 所述光複合器29可以為一偏振分束器或者為一合光 14 200918946 棱鏡(X-Prism)。在本實施例中，該光複合器29為一偏振分 束器，用於將第一、第二數字微鏡元件25、26發射之載入 有圖像訊息之S偏振光及P偏振光組合形成投影光束。該 偏振分束器反射S偏振光而透射P偏振光。當然，可以想 到的是，該偏振分束器還可以係反射p偏振光而透射s偏 振光。 所述投影鏡頭30設置於所述光複合器29之出射光路 上，用於將出射光所形成之圖像放大’並將放大之圖像投 影到螢幕（圖未示）上。 同理，為了進一步提高系統之對比度，還可以在第二 實施例的立體投影光學系統200中加入複數偏振片（圖未 示），設置位置與第一實施例相同。 上述立體投影光學系統使用時可通過分時輪之旋轉， 為數位微鏡元件交替輸入不同偏振狀態之光，從而使得觀 看者之左、右眼交替獲得不同偏振狀態之影像，當該輸入 訊號的頻率足夠快時，觀看者之左右眼分別戴上檢偏方向 相互垂直之兩片偏振片，就可以觀察到立體之圖像訊息。 綜上所述，本發明符合發明專利要件，爰依法提出專 利申請。惟，以上所述者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，舉凡熟悉本案技藝 之人士援依本發明之精神所作之等效修飾或變化，皆應涵 蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1係本發明第一實施例提供之立體投影光學系統在 15 200918946 光照射在分時輪之反射區之結構示意圖。 圖2係圖1之立體投影光學系統在光照射在分時輪之 透射區之結構不意圖。 圖3係在圖1之立體投影光學系統設置有複數偏振片 之結構不意圖。 圖4係本發明第二實施例提供之立體投影光學系統在 光照射在分時輪的反射區之結構示意圖。 圖5係圖4的立體投影光學系統在光照射在分時輪之 透射區之結構不意圖。 【主要元件符號說明】 立體投影光學系統 100 、 200 光源組件 11、21 照明光源 111 色輪 112 積分器 113 偏振轉換器 12、22 分時輪 13、23 反射區 131 偏振轉換元件 16、24 透射區 132 全内反射棱鏡 18 偏振分束器 17 數位微鏡元件 19 投影透鏡 20 > 30 檢偏器 201、 光複合器 20 第一、第二反射裝置 14、15、31 第一、第二全内反射棱鏡 27、28 第一、第二數位微鏡元件 25、26 1626 total internal reflection prisms 27, ο© > between the optical paths of the time-sharing wheel 23, and two reflection means 31 respectively disposed at the gates of the total internal reflection prisms 27, 28 and the time-sharing wheel 23, An optical combiner 29 disposed on the exiting optical path of the first and second digital micromirror elements 25: and a projection lens 30 disposed on the outgoing optical path of the optical repeater 29. σ ° The first embodiment differs from the second embodiment in that the components of the imaging bow are different. In the second embodiment, the first and second digital micromirror elements 25, 26, the first and second total internal reflection prisms 27, 28, and the optical recombiner 29 constitute an imaging engine that emits Out loaded with images of Xun, 13 200918946 light. The structure, working principle, and propagation path of the light source assembly 21, the polarization converter 22, the time-sharing wheel 23, the polarization conversion element 24, and the reflection device 31 are the same as those of the first embodiment, and will not be described herein. The structure and operation principle of the first and second digital micromirror elements 25, 26 are the same as those of the digital micromirror element 19 of the second embodiment, and will not be described again. The first digital micromirror device 25 is disposed on the optical path of the s-polarized light reflected by the time-sharing wheel 23 and emits s-polarized light loaded with the image information, as shown in FIG. The second digital micromirror device 26 is disposed on the optical path of the P-polarized light transmitted by the time-sharing wheel 13 and converted by the polarization conversion element 24, and is transmitted with the image information by the first digital micro-mirror element 25. P polarized light, as shown in Figure 5. The first total internal reflection prism 27 is disposed between the first digital micromirror device 25 and the optical path of the time-sharing wheel 23 to couple the s-polarized light reflected by the time-sharing wheel 23 to the digital sub-mirror element 25 The S-polarized light loaded with the image information transmitted by the first digital micromirror element 13 is transmitted through the first total internal reflection prism 27 to the optical combiner 29. Similarly, the second total internal mirror 28 is disposed between the optical path of the second digital micromirror element 26 and the time-sharing wheel 23 to transmit the P-polarized light coupled by the time-sharing wheel 23 and converted by the polarization conversion element 24. Passing to the second digital micromirror device 26 and transmitting the P-polarized light loaded with the image signal 4 emitted by the second digital micromirror device 26 through the second total internal reflection prism 28 to the optical recombiner 29° The optical combiner 29 can be a polarizing beam splitter or a combined light 14 200918946 prism (X-Prism). In this embodiment, the optical combiner 29 is a polarization beam splitter for combining the S-polarized light and the P-polarized light loaded with the image information by the first and second digital micromirror elements 25, 26. A projection beam is formed. The polarizing beam splitter reflects S-polarized light and transmits P-polarized light. Of course, it is conceivable that the polarizing beam splitter can also reflect p-polarized light and transmit s-polarized light. The projection lens 30 is disposed on an outgoing light path of the optical combiner 29 for amplifying an image formed by the outgoing light and projecting the enlarged image onto a screen (not shown). Similarly, in order to further improve the contrast of the system, a plurality of polarizing plates (not shown) may be incorporated in the stereoscopic projection optical system 200 of the second embodiment, and the arrangement position is the same as that of the first embodiment. The stereoscopic projection optical system can use the rotation of the time-sharing wheel to alternately input light of different polarization states for the digital micro-mirror elements, so that the left and right eyes of the viewer alternately obtain images of different polarization states, when the input signal is When the frequency is fast enough, the left and right eyes of the viewer wear two polarizing plates whose detection directions are perpendicular to each other, and the stereoscopic image information can be observed. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the structure of a stereoscopic projection optical system according to a first embodiment of the present invention, which is irradiated with light in a reflection zone of a time-sharing wheel at 15 200918946. Fig. 2 is a schematic view showing the structure of the stereoscopic projection optical system of Fig. 1 in which the light is irradiated on the transmission region of the time division wheel. Fig. 3 is a schematic view showing a structure in which a plurality of polarizing plates are provided in the stereoscopic projection optical system of Fig. 1. 4 is a schematic view showing the structure of a stereoscopic projection optical system according to a second embodiment of the present invention, in which a light is irradiated on a reflection area of a time-sharing wheel. Fig. 5 is a schematic view showing the structure of the stereoscopic projection optical system of Fig. 4 in which the light is irradiated on the transmission area of the time division wheel. [Description of main component symbols] Stereoscopic projection optical system 100, 200 Light source assembly 11, 21 Illumination light source 111 Color wheel 112 Integrator 113 Polarization converter 12, 22 Time division wheel 13, 23 Reflection area 131 Polarization conversion element 16, 24 Transmitted area 132 total internal reflection prism 18 polarizing beam splitter 17 digital micromirror element 19 projection lens 20 > 30 analyzer 201, optical recombiner 20 first and second reflecting means 14, 15, 31 first and second Reflecting prisms 27, 28 first and second digital micromirror elements 25, 26 16