1235874 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一種用作光偏振轉換(po 1 ar i zat i on convers i on)之光學 元件(optical device)，尤指一種應用於LCD/LCoS投影機領域的高效能偏 振轉換導光管（polarization conversion light pipe)元件。 【先前技術】 如該行業者所知，投影機乃是利用光學投影方式將影像投射至大尺寸螢 幕上的裝置’若依内部所使用的光閥（Lightvalve)的不同，可大致分為陰 極射線管（CRT)投影機、液晶（Liquid Crystal Display，以下簡稱為LCD) 投影機、數位光源處理（Digital Light Processing，DLP)投影機，以及液 晶矽晶(Liquid Crystal on Silicon，以下簡稱為LCoS)投影機四種主要類 型。其中’ LCD投影機因運作時光線係穿透過LCD面板，所以屬於穿透式投 影機，而LCoS、DLP投影機則是靠光線反射的原理顯像，所以又概稱為反 射式投影機。 LCoS投影機的基本原理與LCD投影機相似，只是LCoS投影機是利用 LCoS面板來調變由光源發射出來欲投影至螢幕的光訊號。LC〇s面板是以 CMOS矽晶片為電路基板及反射層，然後再塗佈液晶層後，最後以玻璃平板 封裝。LCD投影機是利用光源穿過LCD作調變，屬於穿透式，而LCoS投影 機中是利用反射的架構，所以光源發射出來的光並不會穿透…必面板，屬 於反射式。LCD投影機與LCoS投影機的相同點是皆需要線偏振（丨inear polarization)光源。 一般而言，LCD投影機與LCoS投影機的光源模組包括有燈泡、反射鏡 (Reflector)、透鏡陣列積分器（integrator)以及極化光束分光 (Polarization Beam Splitter，PBS)陣列等組件。由於LCD面板無法自己 10 1235874 舍光’所以需要光源照明，由燈泡發出的光經由反射鏡反射後，成為平行 光至光學系統’而透鏡陣列積分器則將平行光源分佈重新整理，使光源的 能量分佈均勻，而因為光源投射出的光會被LCD的偏光板吸收，因此PBS 陣列將P偏光轉換成S偏光，提昇光的使用效率。但是，習知PBS陣列光 轉換效率低，而且價格較為昂貴。 見圖一，習知另一種極化光源並且提昇光效率的作法是採用偏振轉換導 光管（Polarization Conversion Light Pipe)元件10，其包括由反射鏡片 12組成的中空型光通道14，以及設置於入口端16的反射鏡片18。反射鏡 片18上k供有一開口 2〇,讓由光源發射出來的光束22經由開口 2〇入射至 光通道14内’然後穿過設置於接近入口端ΐβ的四分之一波板 (Quarter-Wavelength Plate，QWP)24。光通道 14 的出口端 26 垂直設置有 一反射式極化片28，其可讓垂直偏振光32穿透，而平行偏振光34反射回 光通道14。被反射式極化片28反射的平行偏振光34再由反射鏡片18反射 並通過四分之一波板24兩次，而轉換成為垂直偏振光36，如此，即可將原 本無法被利用到的平行偏振光34.回收使用，因而增加垂直偏振光的總光通 量0 然而，前述習知之光極性轉換導光管10卻有缺點仍待克服與改善。首 先，將反射式極化片28 W垂直方式固定接著於光通道14的出口端^會降 低決定光發射訊號品質的消光比（extincti〇n rati〇)。這 化片28與反射鏡片12之間的黏合接面干擾到極化光，而產生雜訊賴 此外，由於反射式極化片28置於光通道14的出口端26，也就是 像面上，因此必須維持非常純淨的表面，少許的微粒灰塵 影響到光投影系統的成像品質。而為了保持反射式極化片28二^= 與完整，料必綱外增加賴外罩，減不僅增域本，啊亦佔據= 間。 11 1235874 【發明内容】 井11 之主要目的在提供一種應用於LCD/LC〇S投影機領域的偏 振轉換導先官兀件，以解決前述問題。 細目的在提供一種應麟⑽脚投影機領域的光源模 、、且，可k仏同純度之偏振極化光源，並提升光使用效率。 為達月ίΐ述之目的’根據本發明之較佳實施例，本發明提供一種用於 之偏振轉換導絲元件，包含有由四片側反魏組成之光 通k ”截面為矩形，且具有—光入口端以及—光出口端；—前反射鏡， 人、口端·，且該前反射鏡具有—開口，容許由—光源《之光線入 f通賴’-延遲板(retardatiQn plate)，設於該光通道内；以及 -傾斜設置之偏振分光额，具有—偏振絲分光平面，其以與該側反射 鏡成約45度夹角組態傾斜設於該延遲板以及該光出口端之間。該延遲板係 為可旋轉入射光電場偏振方向之光學元件。 "為縣發明之上述目的、特徵、和優點能更明顯易懂，下文特舉較佳實 施方式，配&所附圖式，作詳細說明如下。然而如下之較佳實施方式與 圖式僅供苓考與說明用，並非用來對本發明加以限制者。 【實施方式】 /本發明^偏振轉換導光管元件特別適歸LCD投影機系統或L(：〇s投影 機系統。杯關二，圖二顯示本發明第—較佳實施例偏振轉換導光管元 件100之立體透視圖。如圖二所示，偏振轉換導光管元件1〇〇係、置於擴圓 反射燈f光源之前。橢圓反射燈罩光源（1尋).如弧光燈(arci卿） 或咼壓水燈，具有一橢圓長軸（eUiptic maj〇r axis)182，且橢圓反射燈 罩光源180係、對準橢圓長轴182與其成一直線配置在投影系統的光徑上。 12 1235874 橢圓反射燈罩光源180的光束由一其橢圓的第一焦點發出，經由其橢圓 反射燈罩（elliptic plane mirror)反射後，再以入射角α匯聚在橢圓之第 一焦點上。偏振轉換導光管元件1〇〇包括由側反射鏡片112組成的中空長 型的光通道Π4 ’以及設置於入口端（enfrance face)H6的反射鏡片us。 反射鏡片118上提供有一開口 120,其恰位於在前述之橢圓的第二焦點上， 讓由橢圓反射燈罩光源180發出之大部分的光束經由開口 12〇入射至光通 道114内。 偏振轉換導光管元件1〇〇之截面為四方形，其形狀相似於投影螢幕之形 狀。偏振轉換導光管元件100接近橢圓反射燈罩光源18〇之一端為入口端 116’而另一端為出〇端（exit face)126，本發明之特徵之一在於出口端12.6 的成像面（image surface)上130並無設置任何實體光學物件，因此可以達 到最佳的成像品質，而不用擔心灰塵或者刮痕的問題。 偏振轉換導光管元件1〇〇另包含有可旋轉入射光之電場偏振方向之延 遲板（retardation plate)124以及相對於長轴182成夾角<9傾斜設置之偏 振分光模組128。偏振分光模組128係設置在延遲板124與出口端126之間， 且與侧反射鏡片112之夾角0為45度。又，偏振分光模組128的配置較靠 近延遲板124可獲得較佳的成像品質。而且，由於偏振分光模組Kg係設 置於偏振轉換導光管元件1〇〇内，因此不需要在出口端額外增加保護外罩。 根據本發明之第一較佳實施例，偏振分光模組128為一反射式極化片 (reflective p〇larizer)，或者單一格線方向佈設有細密銀或鋁線(wire grid)之光柵元件（p〇iar*izati〇n Spiiuer m〇duie)，例如此对故公司所 、之偏振刀光為’或者是偏振光束分光器（polarization beam splitter)偏振光模組128需具有面消光比以及低反射耗損（refiecu〇n losses) 〇 13 1235874 以單一格線方向佈設有細密銀線之光柵元件為例，電場方向垂直於該單 一格線方向之垂直偏振光可穿透該光柵元件，到達出口端126，而電場方^ 平行於該單一格線方向之平行偏振光則被反射回去。延遲板124具有改綠、 被偏振分光模組128反射之平行偏振光相位之特性。根據本發明之第—車六 佳實施例，延遲板124可以為四分之一波板或經特別設計具有改變光的斗$ 定角度相位之光學元件。 凊參閱圖二，圖二顯示圖二偏振轉換導光管元件10Q之侧視圖。舉例來 說，由光源來的未偏極化光束222經由開口 120入射至光通道114内，首 先穿透過延遲板124，經由側反射鏡片112 —次反射至偏振分光模組128。 如前所述，光束222的垂直偏振光322穿透過偏振分光模組128，而平行偏 振光324則被反射至側反射鏡片112,再被側反射鏡片112反射至偏振分光 模組128，隨後再經由偏振分光模組丨28以及側反射鏡片112、118反射至 延遲板124。垂直偏振光322在兩次穿過延遲板124後成為相位與平行偏振 光324相同之偏振光326，然後順利穿透過偏振分光模組eg。 、由此例可知，平行偏振光324總共被偏振分光模组128反射兩次，然後 才被反射至延遲板124改變其相位成為垂直偏振態。這與習知垂直擺設於 出口端的導光管技財很大的不同，@為平行偏振光324被偏振分光模也 128反射兩次可以使得偏振光默純度提高，而提升投影系統的消光比 (extinction ratio) ° 根據本發明之精神，在不同實施例中，偏振分光模組128還可以利用不 同組態之PBS分光模組代替。以下即列舉數個較可行之實施例，_習知 該技藝者顧解這些實補健參考與說明，本發明實際齡應 剎絡圊為進。 @四‘，、、、I：本發明第二較佳實施例偏振轉換導光管元件之剖面示 意圖。偏振轉換導絲元件2_樣包括由麻射鏡片112組成的光通道 14 1235874 114，以及設置於入口端116的反射鏡片118。反射鏡片n8上提供有一開 口 120 ’讓由光源180發出之大部分的光束經由開口 ι2〇入射至光通道U4 内。偏振轉換導光管元件2〇〇另包含有一延遲板124以及一傾斜設置之偏 振^光模組428。依據本發明第二較佳實施例，偏振分光模組4狀為由兩直 角曼鏡(90-45-45度角的三角型對稱菱鏡)組合而成的pBS光束分光器，其 中間鍍有分光鍍膜(beam splitting coating)430，可使垂直偏振光可穿 透，到達出口端12β，而平行偏振光則被反射回去。 立圖五為依據本發明第三較佳實施例偏振轉換導光管元件之剖面示 意圖。偏振轉換導光管元件3QQ同樣包括由側反射鏡片U2組成的光通道 114，以及没置於入口端116的反射鏡片118。反射鏡片118上提供有一開 口 120 ’讓由光源18〇發出之大部分的光束經由開口 12〇入射至光通道114 内。偏振轉換導光管元件300 3包含有一延遲才反124以及一傾斜設置之偏 振^光模組528。依據本發明第三較佳實施例，偏振分光模組528為鐘有兩 正父分光鍍膜530與532之PBS模組，其中分光鍍膜530與532皆可使垂 直偏振光可穿透，到達心端126，而平行偏振細被反射回去。 圖六為依據本發明第四較佳實施例偏振轉換導光管元件棚之剖面示 意圖。偏振轉換導光管树侧同樣包括由側反射鏡片112組成的光通道 114 ’以及設置於人π端116的反射鏡片118。反射鏡片118上提供有一開 口 120，讓由光源180發出之大部分的光束經由開口 12〇入射至光通道ιΐ4 内。偏振轉換導光管元件400另包含有一延遲板124卩及一傾斜設置 振分光模組628。依據本發明第四較佳實施例，偏振分光模組·為哪模 組，可使垂直偏振光可穿透，到達出口端126，而平行偏振光則被反射回去。' 圖七為依據本發明第五較佳實施例偏振轉換導光管元件刪之剖面 意圖。偏振轉換導光管元件5⑽同樣包括由側反射鏡片112 °細 114，以^置於入口端116的反射鏡片118。反射鏡片ιΐ8上提供 口 120，讓由光源180發出之大部分的光束經由開口 12()人射至光通道^ 15 1235874 内 偏振轉換導光管元件棚另包含有-延遲板124 以及、 振刀光板、组628。依據本發明第四較佳實施例，偏振分光；扁 度凹折的反射式分光片 偏振光則被反射回去。 可使垂直™，.二 >、以上所述僅為本發明之較佳實施例，凡依本發 等變化與修飾，皆應屬本發明專利之涵蓋範圍。 明申睛專利範圍所做之均 【圖式簡單說明】 圖式之簡單說明 為言知偏振轉換導光管元件之示意圖。 發，第—較佳實施例偏 元 Ϊ亡ΐϋΐ二巾偏振轉換導光管元件之舰圖 圖 巧施例偏振轉換導光管元件之剖面示意圖 圖七為依據本發明第五較佳實施^=意圖 闫：r达分二i C 干又丨土貝他列艰振轉換導光管元件之剖而千咅S f ί = ί s較佳實施例偏振轉換導光管元狀^ ^ _t ί= ί巧f ί施例偏振轉換導光管祕之剖面示Ϊ目 圖式之符號說明 10 偏振轉換導光管元件 14 光通道 18 反射鏡片 22 光束 26 出口端 32 垂直偏振光 36 垂直偏振光 100偏振轉換導光管元件 114光通道 118反射鏡片 124延遲板 128偏振分光模組 223光束 324平行偏振光 200偏振轉換導光管元件 12 反射鏡片 16 入口端 20 開口 24 四分之一波板 28 反射式極化片 34 平行偏振光 112側反射鏡片 116 入口端 120 開口 126出口端 130成像面 322垂直偏振光 326垂直偏振光 428偏振分光模組1235874 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to an optical device used as a light polarization conversion (po 1 ar i zat i on convers i on), particularly an LCD / High-performance polarization conversion light pipe element in the field of LCoS projectors. [Previous technology] As the industry knows, a projector is a device that uses an optical projection method to project an image onto a large-sized screen. 'If it is based on the light valve used internally, it can be roughly divided into cathode rays. Tube (CRT) projector, Liquid Crystal Display (hereinafter referred to as LCD) projector, Digital Light Processing (DLP) projector, and Liquid Crystal on Silicon (hereinafter referred to as LCoS) projection There are four main types of machines. Among them, the LCD projector is a transmissive projector because the light passes through the LCD panel during operation, while the LCoS and DLP projectors are developed by the principle of light reflection, so they are also referred to as reflective projectors. The basic principle of the LCoS projector is similar to that of the LCD projector, except that the LCoS projector uses the LCoS panel to modulate the light signal emitted by the light source to be projected onto the screen. The LCOS panel uses a CMOS silicon wafer as a circuit substrate and a reflective layer, and then is coated with a liquid crystal layer, and finally packaged with a glass plate. The LCD projector uses the light source to pass through the LCD for modulation. It is a transmissive type, while the LCoS projector uses a reflective structure, so the light emitted by the light source does not penetrate ... it must be a panel, which is a reflective type. LCD projectors and LCoS projectors have the same point in that they both require linear polarization (inear polarization) light sources. Generally speaking, the light source modules of LCD projectors and LCoS projectors include components such as a light bulb, a reflector, a lens array integrator, and a Polarization Beam Splitter (PBS) array. Since the LCD panel cannot shed light by itself 10 1235874, so it needs a light source to illuminate. The light emitted by the light bulb is reflected by a reflector and becomes parallel light to the optical system. And the lens array integrator rearranges the distribution of the parallel light source so that the energy of the light source The distribution is uniform, and because the light projected from the light source will be absorbed by the polarizing plate of the LCD, the PBS array converts P polarized light to S polarized light, improving the efficiency of light use. However, the conventional PBS array has low light conversion efficiency and is relatively expensive. As shown in Fig. 1, another method of polarizing a light source and improving the light efficiency is to use a Polarization Conversion Light Pipe element 10, which includes a hollow light channel 14 composed of a reflective lens 12, and is provided in Mirror 18 of the entrance end 16. An opening 20 is provided on the reflecting lens 18, and the light beam 22 emitted from the light source is incident into the optical channel 14 through the opening 20, and then passes through a quarter-wave plate (Quarter-Wavelength) disposed near the entrance end ΐβ Plate, QWP) 24. An exit end 26 of the optical channel 14 is provided with a reflective polarizer 28 vertically, which allows the vertically polarized light 32 to pass through, and the parallel polarized light 34 is reflected back to the optical channel 14. The parallel polarized light 34 reflected by the reflective polarizing plate 28 is reflected by the reflective lens 18 and passes through the quarter wave plate 24 twice to be converted into the vertically polarized light 36. In this way, the originally unavailable light can be used. Parallel polarized light 34. It is recycled, so the total luminous flux of vertically polarized light is increased. However, the conventional light polarity switching light guide tube 10 has disadvantages that need to be overcome and improved. First, fixing the reflective polarizer 28 W vertically to the exit end of the optical channel 14 will reduce the extinction ratio (extinctión rati〇) that determines the quality of the light emission signal. The adhesive interface between the reflector 28 and the reflective lens 12 interferes with polarized light and generates noise. In addition, because the reflective polarizer 28 is placed on the exit end 26 of the light channel 14, which is the image plane, Therefore, a very pure surface must be maintained. A small amount of particulate dust affects the imaging quality of the light projection system. In order to keep the reflective polarizer 28 ^ = intact and complete, it is necessary to increase the outer cover in addition to the outline, which not only increases the field cost, but also occupies = time. 11 1235874 [Summary of the invention] The main purpose of well 11 is to provide a polarization conversion guide element used in the field of LCD / LCOS projectors to solve the aforementioned problems. The objective is to provide a light source mode that can meet the needs of projectors in the field of projectors, and can polarize light sources of the same purity and improve the efficiency of light use. For the purpose of describing the month, according to a preferred embodiment of the present invention, the present invention provides a polarization conversion guide wire element comprising a light flux k composed of four pieces of anti-wei side, which has a rectangular cross section and has— The light entrance end and the light exit end; the front reflector, the front end, and the mouth end, and the front reflector has an opening to allow the light from the light source to pass through the f-relay'-retardatiQn plate. In the optical channel; and-an obliquely set polarization splitting beam having a-polarization wire beam splitting plane, which is inclinedly arranged between the retardation plate and the light exit end at an angle configuration of about 45 degrees with the side reflector. The retardation plate is an optical element capable of rotating the polarization direction of the incident optical electric field. "The above-mentioned objects, features, and advantages of the invention can be more clearly understood. The preferred embodiment is exemplified below, with & The detailed description is as follows. However, the following preferred embodiments and drawings are only for the purpose of explanation and explanation, and are not intended to limit the present invention. [Embodiment] / The present invention ^ Polarization conversion light pipe element is particularly suitable LCD Projector system or L: projector system. Cup two, Figure 2 shows a perspective view of a polarization conversion light pipe element 100 according to the first preferred embodiment of the present invention. As shown in Figure 2, the polarization conversion light guide The tube element 100 is placed in front of the round reflection light source f. The light source of the elliptical reflector lamp (1 seek). For example, an arc lamp or a pressure water lamp, it has an elliptical long axis (eUiptic maj〇r axis ) 182, and the elliptical reflection lamp cover light source 180 is aligned with the long axis 182 of the ellipse and is arranged in line with the light path of the projection system. 12 1235874 The light beam of the elliptical reflection lamp cover 180 is emitted from a first focus of its ellipse and passes through it. After being reflected by an elliptic plane mirror, it is converged on the first focus of the ellipse at an incident angle α. The polarization conversion light pipe element 100 includes a hollow long optical channel composed of a side reflection lens 112. And the reflection lens us provided at the entrance face H6. The reflection lens 118 is provided with an opening 120, which is located on the second focus of the aforementioned ellipse, so that most of the light emitted by the elliptical reflector lamp light source 180 is emitted. The light beam is incident into the light channel 114 through the opening 120. The cross section of the polarization conversion light guide element 100 is a square, and its shape is similar to the shape of a projection screen. The polarization conversion light guide element 100 is close to the elliptical reflector lamp light source 18 One end is the entrance end 116 'and the other end is the exit face 126. One of the features of the present invention is that 130 is not provided with any solid optical object on the image surface 12.6 of the exit end, so it can be To achieve the best imaging quality without worrying about dust or scratches. The polarization conversion light guide element 100 also includes a retardation plate 124 that can rotate the polarization direction of the electric field of the incident light, and relative to the long axis 182 polarizing beam splitting module 128 at an included angle < 9 obliquely. The polarization beam splitter module 128 is disposed between the retardation plate 124 and the exit end 126, and the angle 0 with the side reflection lens 112 is 45 degrees. In addition, the configuration of the polarization beam splitter module 128 is closer to the retardation plate 124 to obtain better imaging quality. In addition, since the polarization beam splitter module Kg is located in the polarization conversion light pipe element 100, there is no need to add an additional protective cover at the exit end. According to a first preferred embodiment of the present invention, the polarization beam splitting module 128 is a reflective polarizer, or a grating element provided with a fine silver or aluminum grid in a single grid line direction ( p〇iar * izati〇n Spiiuer m〇duie), for example, for this company, the polarization knife light is' or polarization beam splitter (polarization beam splitter) polarization module 128 needs to have a surface extinction ratio and low reflection Refiecu〇n losses 〇13 1235874 Take a grating element with fine silver lines in the direction of a single grid line as an example. Vertically polarized light with an electric field perpendicular to the direction of the single grid line can penetrate the grating element and reach the exit end 126. , And the parallel polarized light with the electric field square parallel to the direction of the single grid line is reflected back. The retardation plate 124 has a characteristic of changing the phase of parallel polarized light that is changed to green and reflected by the polarization beam splitting module 128. According to the sixth preferred embodiment of the present invention, the retardation plate 124 may be a quarter wave plate or an optical element that is specially designed to have a fixed angle phase of the light bucket.凊 Refer to FIG. 2, which shows a side view of the polarization conversion light pipe element 10Q of FIG. 2. For example, the unpolarized light beam 222 from the light source is incident into the optical channel 114 through the opening 120, first passes through the retardation plate 124, and is reflected once to the polarization beam splitter module 128 through the side reflection lens 112. As mentioned above, the vertically polarized light 322 of the light beam 222 passes through the polarization beam splitter module 128, and the parallel polarized light 324 is reflected to the side reflection lens 112, and then reflected by the side reflection lens 112 to the polarization beam splitter module 128, and then Reflected to the retardation plate 124 through the polarization beam splitter module 28 and the side reflection lenses 112 and 118. The vertically polarized light 322 passes through the retardation plate 124 twice and becomes the polarized light 326 having the same phase as the parallel polarized light 324, and then passes through the polarization beam splitting module eg. It can be seen from this example that the parallel polarized light 324 is reflected by the polarization beam splitter module 128 a total of two times before being reflected to the retardation plate 124 to change its phase to a vertical polarization state. This is very different from the conventional technology of light guide tubes arranged vertically at the exit end. @ 为 Parallel polarized light 324 is also reflected twice by the polarization beam splitting mode 128, which can improve the silent purity of polarized light and increase the extinction ratio of the projection system ( extinction ratio) ° According to the spirit of the present invention, in different embodiments, the polarization beam splitter module 128 may also be replaced with a PBS beam splitter module with a different configuration. The following is a list of several more feasible embodiments. _ Known The artist understands these practical supplementary references and descriptions, and the actual age of the present invention should be improved. @ 四 ‘,,,, I: A cross-sectional view of a polarization conversion light pipe element according to a second preferred embodiment of the present invention. The polarization conversion guide wire element 2 includes a light channel 14 1235874 114 composed of a hemp lens 112, and a reflection lens 118 provided at the entrance end 116. An opening 120 'is provided on the reflective lens n8 to allow most of the light beam emitted by the light source 180 to enter the light channel U4 through the opening ι20. The polarization conversion light pipe element 2000 further includes a retardation plate 124 and a polarized light module 428 disposed obliquely. According to a second preferred embodiment of the present invention, the polarization beam splitter module 4 is a pBS beam splitter formed by combining two right-angle Mann mirrors (triangular symmetrical rhombic mirrors with an angle of 90-45-45 degrees). Beam splitting coating 430 allows vertical polarized light to pass through to the exit end 12β, while parallel polarized light is reflected back. FIG. 5 is a schematic cross-sectional view of a polarization conversion light pipe element according to a third preferred embodiment of the present invention. The polarization conversion light pipe element 3QQ also includes a light channel 114 composed of a side reflection lens U2, and a reflection lens 118 not disposed at the entrance end 116. An opening 120 'is provided on the reflecting lens 118 to allow most of the light beam emitted by the light source 18 to enter the light channel 114 through the opening 120. The polarization conversion light pipe element 300 3 includes a retarder 124 and a polarized light module 528 disposed obliquely. According to a third preferred embodiment of the present invention, the polarization beam splitting module 528 is a PBS module having two positive-parent beam splitting coatings 530 and 532, and both of the beam splitting coatings 530 and 532 can penetrate vertically polarized light and reach the heart end. 126, and the parallel polarization is reflected back. Fig. 6 is a schematic cross-sectional view of a polarization conversion light pipe element shed according to a fourth preferred embodiment of the present invention. The tree side of the polarization conversion light pipe also includes a light channel 114 ′ composed of a side reflection lens 112 and a reflection lens 118 provided at the human π end 116. An opening 120 is provided on the reflecting lens 118, so that most of the light beam emitted by the light source 180 is incident into the light channel ι4 through the opening 120. The polarization conversion light pipe element 400 further includes a retardation plate 124A and an inclined beam splitter module 628. According to the fourth preferred embodiment of the present invention, the polarization beam splitting module is a module that allows vertical polarized light to pass through to the exit end 126, and parallel polarized light is reflected back. Figure 7 is a schematic cross-sectional view of a polarization conversion light pipe element according to a fifth preferred embodiment of the present invention. The polarization conversion light pipe element 5⑽ also includes a side reflection lens 112 ° thin 114, and a reflection lens 118 placed at the entrance end 116. The reflecting lens ιΐ8 is provided with a port 120, so that most of the light beam emitted by the light source 180 is transmitted to the light channel through the opening 12 () ^ 15 1235874 The internal polarization conversion light pipe element shed also includes-a retardation plate 124 and a vibrator Light board, group 628. According to a fourth preferred embodiment of the present invention, polarized light is split; the flat concave concave reflective spectroscope is polarized and reflected back. Make Vertical ™, .II >, the above is only a preferred embodiment of the present invention, and any changes and modifications according to the present invention should be covered by the patent of the present invention. Ming Shen's patent scope is all done [Simplified description of the drawing] The simple description of the drawing is a schematic diagram of the polarization conversion light pipe element. The first preferred embodiment of the polarization conversion light pipe element diagram of the second embodiment of the polarization conversion light pipe element is a schematic sectional view of the polarization conversion light pipe element of the embodiment. Figure 7 is a fifth preferred embodiment according to the present invention ^ = Intent Yan: r dafen ii i c dry 丨 Tuppetale violent conversion light guide tube section and thousands of S f ί = ί s preferred embodiment polarization conversion light guide element ^ ^ _t ί = ί 巧 f ί Example Polarization conversion light guide section cross section display diagram symbol description 10 Polarization conversion light guide element 14 Light channel 18 Reflective lens 22 Light beam 26 Exit end 32 Vertical polarized light 36 Vertical polarized light 100 Polarization Conversion light pipe element 114 light channel 118 reflection lens 124 delay plate 128 polarization beam splitter module 223 beam 324 parallel polarized light 200 polarization conversion light pipe element 12 reflection lens 16 entrance end 20 opening 24 quarter wave plate 28 reflective type Polarizing plate 34 Parallel polarized light 112 Side reflection lens 116 Entrance end 120 Opening 126 Exit end 130 Imaging surface 322 Vertically polarized light 326 Vertically polarized light 428 Polarization beam splitting module
16 1235874 300偏振轉換導光管元件 528偏振分光模組 400偏振轉換導光管元件 628偏振分光模組 500偏振轉換導光管元件 728偏振分光模組16 1235874 300 polarization conversion light pipe element 528 polarization beam splitting module 400 polarization conversion light pipe element 628 polarization beam splitting module 500 polarization conversion light pipe element 728 polarization beam splitting module
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