200842402 九、發明說明： 【發明所屬之技術領域】 >本發明是有關於-種全反射稜鏡組，特別是指一種可 提高對比值的全反射稜鏡組。 【先前技術】 在我們的世界裡，視覺和聲音都是類比形式，但當我 們利用電子訊號來獲取、錄存和傳送這些類比現象時，採 用數位技術卻能帶來許多重大優點；音訊處理就是一個例 子’當它從磁帶和黑膠唱片的類比技術轉變為數位音樂光 碟後’數位技術的優點也第一次鮮明的呈現在人們面前·， 而數位投影和顯示技術，它能接受數位視訊，然後產生一 系列的數位光脈衝；這些光脈衝進入眼睛後，我們的眼睛 會把它解譯成為彩色類比影像；所謂的數位微型反射鏡元 件（Digital Micromirror Device，簡稱 DMD)，及微型反 射鏡陣列元件（Micro-mirror Array)，皆是一種具有多個 反射性光開關用來達到數位投影和顯示的雙穩態空間光源 調變裝置（Bistable Spatial light modulator)。 參閱圖1，一種現有適用於上述雙穩態空間光源調變裝 置11的全反射稜鏡組12，包含分別為三角柱型的一入射稜 鏡13及一出射稜鏡14,該入射稜鏡13包括一供一光束15 入射的入射面131、一供由該入射面131入射之光束15進 行全反射的全反射面132,及一鄰近於該雙穩態空間光源調 變裝置11的裝置面133;該出射棱鏡14包括一平行並鄰近 於該全反射面132的連接面141、一平行於該裝置面133並 5 200842402 供該光束15出射的出射面142,及一分別連接該連接面 141與出射面142的第三面143 ;另外，在該連接面i4i與 該全反射面132之間具有一實質上約3〜1〇//m的間隙g。 當光束進々該入射稜鏡13入射面131、經該全反射面 132全反射、由該裝置面133射出至該雙穩態空間光源調變 裝置11上，而位於該雙穩態空間光源調變裝置u中的每一 反射性光開關111，可於一開啟狀態（cm state)與一關閉狀態 (off state)之間切換，如此，可將該光束〗5反射至不同的方 向；如果當該等反射性光開關111位於該開啟狀態時，反射 光束151如圖1中的實線所示，垂直進入該裝置面133、經 該入射稜鏡13全反射面132、該出射稜鏡14連接面ι41、 由該出射面142垂直射出，最後會被投影和顯示於一螢幕（ 圖未示）上；另外，如果該等反射性光開關m位於該關閉 狀態時，反射光束152如圖1中的虛線所示，斜向進入該 裝置面133、經該入射棱鏡13全反射面132、該出射稜鏡 14連接面141、由該出射面142斜向射出，利用將光束偏 折的方式而不投影和顯示於螢幕上。 但是，該等反射性光開關111位於該關閉狀態下所產生 斜向射出的光束’理想上應該如上述全部均偏折而無法投 影和顯示於螢幕上，卻因為現有的全反射稜鏡組12·無法把 該等反射性光開關11位於該關閉狀態下產生的斜向射出光 束152，與位於該開啟狀態下產生的垂直射出光束151之間 的夾角拉大，造成有一部份光束最後還是會被投影和顯示 於螢幕上；而根據螢幕對比值的定義是：位於該開啟狀態 6 200842402 下產生的一亮度除以位於該關閉狀態下產生的一亮度；如 此，上述現有全反射稜鏡組12會讓位於該關閉狀態下產生 斜向射出的部份光束152,最後還是會被投影和顯示於螢幕 上而產生亮度，結果造成對比值的降低。 【發明内容】 因此’本發明之目的，即在提供一種可以提高對比值 的全反射稜鏡組。 藝於是，本發明可提高對比值的全反射稜鏡組，適用於 一具有多數反射性光開關的雙穩態空間光源調變裝置，每 一光開關可於一開啟狀態與一關關狀態之間切換，該全反 射稜鏡組包含一入射稜鏡、一導引稜鏡，及一出射稜鏡； 該入射稜鏡包括一供一光束入射的入射面、一供由該入射 面入射之光束進行全反射的第一全反射面，及一鄰近於該 雙穩態空間光源調變裝置的裝置面；該導引稜鏡包括一平 行並鄰近於該第一全反射面的導引連接面，及一供該等反 鲁 射性光開關在關閉狀態時所反射之光束進行全反射的第二 全反射面，該出射稜鏡包括一平行並鄰近於該第一全反射 面的第一連接面、一平行並鄰近於該第二全反射面的第二 連接面，及一供該光束出射的出射面。 本發明之功效在於··本發明更包含有一導引稜鏡，藉 由該導引稜鏡的第二全反射面，可將該等反射性光開關在 關閉狀態時所反射之光束進行全反射，使之不會被投影和 顯示於一螢幕上而產生亮度，如此，可提高對比值，確實 能達到本發明之目的。 7 200842402 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 參閱圖2’本發明可提高對比值的全反射稜鏡組2，適 用於具有夕數反射性光開關81(圖2中只以位於中間及兩 ' 端部的反射性光開關代表）的雙穩態空間光源調變裝置 _ 8(Bistable Spatial light modulator)，例如：本實施例所示之 一數位微型反射鏡元件（Digital Micr〇mirr〇r Device，簡 稱DMD)，或者是一微型反射鏡陣列元件（Micr〇—mirr〇r Array);而其中每一反射性光開關81可於一開啟狀態（〇n state)、一關關狀態（off state)之間切換，使一入射的光束91 旎反射至不同的角度。本發明可提高對比值的全反射稜鏡 組2包含分別為三角柱型的一入射稜鏡3、一導引稜鏡4， 及一出射稜鏡5。另外，在該入射稜鏡3與導引稜鏡4之間 • 、該入射稜鏡3與出射稜鏡5之間，及該導引稜鏡4與出 射稜鏡5之間分別各具有一間隙gi、g2、G3。 該入射稜鏡3，包括一供該光束91入射的入射面31、 一供由該入射面31入射之光束91進行全反射的第一全反 射面32 ’及一平行且鄰近於該雙穩態空間光源調變裝置8 的裝置面33;在本實施例中，由該入射稜鏡3第一全反射 面32與空氣所形成的一臨界角X(Cdtical angle，如圖2 所示）’經計算約在38〜45度之間，即經該入射面M入射 之光束91與該第一全反射面32 —法線所形成的一夾角只 8 200842402 要大於上述的臨界角X，即會形成全反射；如此，調整該第 一全反射面32與裝置面33所夾設的一夾角a(如圖2所示） ，及該入射面31與裝置面33所夾設的一夹角b(如圖2所 示)的設計，即可使該光束91經該入射面31在該第一全反 射面32上進行全反射。而該第一全反射面32與裝置面33 ‘ 所夾設的夾角A其中較佳的角度範圍是在25〜50度之間， 該入射面31與裝置面33所夾設的夾角b其中較佳的角度 馨 範圍是在90〜120度之間，例如在本實施例中，該夾角A是 35度，該夾角b是95度，如此，即可讓該光束9丨在該第 一全反射面32上進行全反射。另外，值得一提的是，該裝 置面33也可以是鄰近於該雙穩態空間光源調變裝置8但不 平行，仍可達成上述在該第一全反射面32上進行的全反射 ,而上述臨界角X，及夾角A、夾角B的較佳角度範圍， 疋依該入射稜鏡3的折射率範圍在ι·4〜16與該間隙g2的 折射率為1 ·〇的情形下配合設計出的較佳角度範圍；當該入 參 射稜鏡3折射率範圍或該間隙G2折射率不同於本實施例時 ，本發明的臨界角X，及夾角A、夾角B的較㈣度範圍 將會全部或部份配合改變而不受限定。 該導引稜鏡4，包括一平行並鄰近於該第一全反射面 3^的導引連接自41 ’及—供該等反射性光開關81在關閉 狀態時所反射之光束進行全反射的第二全反射面42,及-分別連接該導引連接面41與第二全反射面42的第三面杓 。在本實施例中，該導引連接面41與該p全反射面W 之間是以多點點膠黏合，且具有寬度約3〜⑽m的該間隙 9 200842402 G1，以便使鄰近的該第一全反射面32形成該臨界角χ ;另 外，由該導引稜鏡4第二全反射面42與空氣也形成有一臨 界角Y ’經計算約在38〜45度之間；如此，調整第二全反射 面42與導引連接面41所夾設的一夾角C(如圖2所示），即 可讓該等反射性光開關81在關閉狀態時所反射之光束92 在該第二全反射面42上進行全反射。而該第二全反射面42 與導引連接面41所夾設的夾角c其中較佳的角度範圍是在 • 6〇〜9〇度之間，例如在本實施例中，該夾角C是70度，如 此，即可讓該等反射性光開關81在關閉狀態時所反射之光 束在該第一全反射面42上進行全反射。同上段所述，上述 界角Y與夾角C的較佳角度範圍，是依該導引稜鏡4的 折射率圍在1·4〜ι·6與該間隙〇3的折射率|1〇的情形 下配合設計出的較佳角度範圍；當該導引稜鏡4折射率範 圍或該« G3折射率不同於本實施例時，本發明的臨界角 Υ與夾角C較佳角度範圍將會全部或部份配合改變而不受 春 限定。 該出射稜鏡5，包括一平行並鄰近於該第一全反射面 32的第一連接面51、一平行並鄰近於該第二全反射面u 的第二連接面52,及一供該光束出射的出射面53。在本實 ，二:，該出射稜鏡5的第一連接面51與該入射稜鏡3的 第一全反射面32之間是以多點點膠黏合，且具有寬度約 3〜l〇em的該間隙G2，以便使鄰近的該第一全反射面形成 該臨界角X;另外，該出射稜鏡5的第二連接面U與該導 ㈣鏡4的第二全反射面42之間也是以多點點膠黏合，且 10 200842402 具有寬度約3〜10/zm的該間隙G3，以便使該第二全反射面 42形成該臨界角γ。 以下說明本發明可提高對比值的全反射稜鏡組2如何 達成可提高對比值的功效： 參閱圖3,首先，將該等反射性光開關81控制於該開 啟狀態下，此時，該光束91依序入射於該入射面31、全反 射於該第一全反射面32、折射經過該裝置面33、再射=該 φ 雙穩態空間光源調變裝置8 ;由於該等反射性光開關81均 是處於該開啟狀態下，所以，該光束91被以實質上垂直於 該裝置面33的方向反射出（如圖3所示）；接著，再依序折 射經過該裝置面33、折射經過該第一全反射面32、此時， 其中的一部份光束是折射經過該導引連接面41、折射經過 該第二全反射面42、折射經過該第二連接面52、出射於該 出射面53，而其中另-部份則是折射經過該第一連接面η 、出射於該出射® 53;最後全部的光束均會被投影和顯示 φ 於一螢幕（圖未示）上。 參閱圖4 ,接著，將該等反射性光開關81控制於該關 . 閉狀態下，此時，該光束91依序入射於該入射面3〗、全反 射於該第一全反射面32、折射經過該裝置面33、再射入該 雙穩態㈣光源調變裝置·該等反射性光開關81 = 是處於該關閉狀態下，所以，反被射的光束92以斜向進入 該裝置面33(如圖4中所示）；接著，再依序折射經過該裝置 面33、折射經過第一全反射面32、折射經過該導引連接面 41、接著，其中大部份光束92’再次全反射於該第二全反射 11 200842402200842402 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention relates to a total reflection group, and more particularly to a total reflection group which can increase the contrast value. [Prior Art] In our world, both vision and sound are analogous forms, but when we use electronic signals to acquire, record, and transmit these analogies, the use of digital technology can bring many significant advantages; audio processing is An example 'When it changed from the analog technology of tape and vinyl records to digital music discs, the advantages of digital technology are also clearly presented in front of people, and digital projection and display technology can accept digital video. A series of digital light pulses are then generated; after the light pulses enter the eye, our eyes interpret it as a color analog image; the so-called Digital Micromirror Device (DMD), and the micro mirror array The Micro-mirror Array is a bistable spatial light modulator with multiple reflective optical switches for digital projection and display. Referring to FIG. 1, a total reflection group 12 suitable for the above-described bistable spatial light source modulation device 11 includes an entrance pupil 13 and an exit pupil 14 respectively of a triangular prism shape, and the incident pupil 13 includes An incident surface 131 for incident on a light beam 15, a total reflection surface 132 for total reflection of the light beam 15 incident on the incident surface 131, and a device surface 133 adjacent to the bistable spatial light source modulation device 11; The exiting prism 14 includes a connecting surface 141 parallel to and adjacent to the total reflecting surface 132, an exit surface 142 parallel to the device surface 133 and 5 200842402 for the light beam 15 to exit, and a connecting connection surface 141 and an exit. The third surface 143 of the surface 142; and a gap g between the connecting surface i4i and the total reflection surface 132 of substantially 3 to 1 〇//m. When the light beam enters the entrance surface 131 of the entrance pupil 13 and is totally reflected by the total reflection surface 132, the device surface 133 is emitted to the bistable spatial light source modulation device 11, and the bistable spatial light source is adjusted. Each reflective optical switch 111 in the variable device u can be switched between an open state (cm state) and an off state, so that the light beam 5 can be reflected to different directions; When the reflective optical switch 111 is in the open state, the reflected light beam 151 enters the device surface 133 vertically, and is connected to the exit pupil 132 through the incident pupil 13 as shown by the solid line in FIG. The surface ι41 is perpendicularly emitted from the exit surface 142, and is finally projected and displayed on a screen (not shown). In addition, if the reflective optical switch m is in the closed state, the reflected light beam 152 is as shown in FIG. The dotted line enters the device surface 133 obliquely, passes through the incident reflective prism 13 total reflection surface 132, the exit pupil 14 connection surface 141, and is obliquely emitted from the exit surface 142, by means of deflecting the light beam without Project and display on the screen. However, the obliquely emitted light beams of the reflective optical switches 111 in the closed state should ideally be deflected as shown above and cannot be projected and displayed on the screen, but because of the existing total reflection group 12 The angle between the obliquely outgoing beam 152 generated by the reflective optical switch 11 in the closed state and the vertical outgoing beam 151 generated in the open state cannot be increased, causing a portion of the beam to eventually Projected and displayed on the screen; and according to the screen contrast value is defined as: a brightness generated in the on state 6 200842402 divided by a brightness generated in the off state; thus, the above-mentioned existing total reflection group 12 A portion of the beam 152 that is obliquely ejected in the closed state will be projected and displayed on the screen to produce brightness, resulting in a decrease in the contrast value. SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a total reflection group which can increase the contrast value. Therefore, the present invention can improve the total reflection 稜鏡 group of contrast values, and is suitable for a bistable spatial light source modulation device having a plurality of reflective optical switches, each of which can be in an open state and an off state. Inter-switching, the total reflection group includes an entrance pupil, a guide pupil, and an exit pupil; the incident pupil includes an incident surface for a beam incident, and a beam for incident from the incident surface a first total reflection surface for total reflection, and a device surface adjacent to the bistable spatial light source modulation device; the guide frame includes a guiding connection surface parallel to and adjacent to the first total reflection surface, And a second total reflection surface for total reflection of the reflected light beam when the anti-radial optical switch is in a closed state, the exit pupil comprising a first connection surface parallel to and adjacent to the first total reflection surface a second connecting surface parallel to and adjacent to the second total reflection surface, and an exit surface for the light beam to exit. The invention has the effect that the invention further comprises a guiding raft, and the second total reflecting surface of the guiding raft can totally reflect the reflected light beam when the reflective optical switch is in the closed state So that it will not be projected and displayed on a screen to produce brightness, so that the contrast value can be improved, and the object of the present invention can be achieved. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to FIG. 2', the total reflection 稜鏡 group 2 of the present invention can improve the contrast value, and is suitable for the double-reflective optical switch 81 (represented in FIG. 2 only by the reflective optical switch located at the middle and the two 'ends). A Bistable Spatial Light Modulator, for example, a digital micro mirror element (Digital Micr〇mirr〇r Device, DMD for short), or a micro mirror array Element (Micr〇-mirr〇r Array); and each of the reflective optical switches 81 can be switched between an on state and an off state to make an incident beam 91 旎Reflected to different angles. The present invention can improve the total reflection of the contrast value. Group 2 comprises an entrance pupil 3, a guide pupil 4, and an exit pupil 5, respectively, of a triangular prism type. In addition, between the incident 稜鏡3 and the guide 稜鏡4, between the incident 稜鏡3 and the exit pupil 5, and between the guide 稜鏡4 and the exit pupil 5 respectively have a gap Gi, g2, G3. The incident pupil 3 includes an incident surface 31 for the incident of the light beam 91, a first total reflection surface 32' for total reflection of the light beam 91 incident from the incident surface 31, and a parallel and adjacent to the bistable The device surface 33 of the spatial light source modulation device 8; in this embodiment, a critical angle X (Cdtical angle, as shown in FIG. 2) formed by the first total reflection surface 32 of the incident 稜鏡3 and the air The calculation is between about 38 and 45 degrees, that is, an angle formed by the light beam 91 incident on the incident surface M and the normal of the first total reflection surface 32 is only greater than the above-mentioned critical angle X, which is formed. Total reflection; thus, adjusting an angle a between the first total reflection surface 32 and the device surface 33 (as shown in FIG. 2), and an angle b between the incident surface 31 and the device surface 33 ( As shown in FIG. 2, the light beam 91 can be totally reflected on the first total reflection surface 32 via the incident surface 31. The angle between the first total reflection surface 32 and the device surface 33' is preferably between 25 and 50 degrees, and the angle between the incident surface 31 and the device surface 33 is higher. The preferred angle range is between 90 and 120 degrees. For example, in the embodiment, the angle A is 35 degrees, and the angle b is 95 degrees. Thus, the beam 9 is allowed to be in the first total reflection. Total reflection is performed on face 32. In addition, it is worth mentioning that the device surface 33 may also be adjacent to the bistable spatial light source modulation device 8 but not parallel, and the total reflection on the first total reflection surface 32 may still be achieved. The critical angle X, and the preferred angular range of the angle A and the angle B are designed according to the refractive index range of the incident pupil 3 in the case where the refractive index of the gap g2 is 1 · 〇. a preferred range of angles; when the refractive index range of the entrance pupil 3 or the refractive index of the gap G2 is different from the embodiment, the critical angle X of the present invention, and the range of the angle (A) of the angle A and the angle B will be All or part of the change will be unrestricted. The guiding raft 4 includes a guiding connection parallel to the first total reflection surface 3^ from the 41' and a total reflection of the light beam reflected by the reflective optical switch 81 in the closed state. The second total reflection surface 42 and the third surface 杓 of the second connection surface 42 and the second total reflection surface 42 are respectively connected. In this embodiment, the guiding connection surface 41 and the p total reflection surface W are adhesively bonded by a plurality of points, and the gap 9 200842402 G1 having a width of about 3 to 10 (10) m so as to be adjacent to the first The total reflection surface 32 forms the critical angle χ; in addition, the second total reflection surface 42 and the air are also formed by the guide 稜鏡4 to form a critical angle Y' which is calculated to be between 38 and 45 degrees; An angle C between the total reflection surface 42 and the guiding connection surface 41 (as shown in FIG. 2) is such that the light beam 92 reflected by the reflective optical switch 81 in the off state is at the second total reflection. Total reflection is performed on face 42. The angle between the second total reflection surface 42 and the guiding connection surface 41 is preferably between 6 〇 and 9 ,. For example, in the embodiment, the angle C is 70. Thus, the light beam reflected by the reflective optical switch 81 in the off state can be totally reflected on the first total reflection surface 42. As described in the above paragraph, the preferred angular range of the boundary angle Y and the angle C is such that the refractive index of the guide 稜鏡 4 is around 1·4 〜6·6 and the refractive index of the gap 〇3 is 〇1〇. In the case of a better angle range designed in accordance with the design; when the refractive index range of the guide 稜鏡4 or the refractive index of the «G3 is different from that of the embodiment, the preferred angle range of the critical angle Υ and the angle C of the present invention will be all Or some of the changes are not subject to spring restrictions. The exit pupil 5 includes a first connection surface 51 parallel to and adjacent to the first total reflection surface 32, a second connection surface 52 parallel to and adjacent to the second total reflection surface u, and a light beam for the beam The exit surface 53 that exits. In this embodiment, two: the first connecting surface 51 of the exit pupil 5 and the first total reflection surface 32 of the incident pupil 3 are glued by a plurality of dots, and have a width of about 3 to l〇em. The gap G2 is such that the adjacent first total reflection surface forms the critical angle X; in addition, the second connection surface U of the exit pupil 5 and the second total reflection surface 42 of the fourth mirror 4 are also The glue is bonded by a plurality of dots, and 10 200842402 has the gap G3 having a width of about 3 to 10/zm so that the second total reflection surface 42 forms the critical angle γ. The following describes how the total reflection group 2 of the present invention can improve the effect of improving the contrast value: Referring to FIG. 3, first, the reflective optical switches 81 are controlled in the on state, at this time, the beam 91 is sequentially incident on the incident surface 31, totally reflected on the first total reflection surface 32, refracted through the device surface 33, re-shooting = the φ bistable spatial light source modulation device 8; due to the reflective optical switches 81 is in the open state, so the light beam 91 is reflected in a direction substantially perpendicular to the device surface 33 (as shown in FIG. 3); then, it is sequentially refracted through the device surface 33, and the refractive The first total reflection surface 32, at this time, a part of the light beam is refracted through the guiding connection surface 41, refracted through the second total reflection surface 42, refracted through the second connection surface 52, and exited at the exit The face 53, wherein the other part is refracted through the first connecting surface η, exits the exiting ® 53; finally all of the light beams are projected and displayed φ on a screen (not shown). Referring to FIG. 4, the reflective optical switch 81 is controlled in the closed state. At this time, the light beam 91 is sequentially incident on the incident surface 3, and is totally reflected on the first total reflection surface 32. The refraction passes through the device surface 33 and is incident on the bistable (four) light source modulation device. The reflective optical switches 81 are in the off state, so that the reversely incident beam 92 enters the device surface obliquely. 33 (shown in FIG. 4); then, sequentially refracted through the device face 33, refracted through the first total reflection surface 32, refracted through the guide connection surface 41, and then, most of the light beam 92' is again Total reflection in the second total reflection 11 200842402
面42,此時經全反射後的光束92,會與該等反射性光開關 81位於該開啟狀態下產生一可投影和顯示於該螢幕上的路 徑P，夾設有一夾角D，並朝向該第三面43出射，所以， 最後無法被投影和顯示於該螢幕（圖未示）上。另外，其餘的 少份部光束92”雖没有全反射於該第二全反射面42 :是從 該第三面43直接出射，但也因距軸投影和顯示於該榮幕 上的路徑p有相當的距離，所以，此部份光束92，，仍無法被 投影和顯示於該螢幕上、综合上述’當該等反射性光開關 81位於該關閉狀態時，該二部份光束92，、92，，均無法被投 影和顯示於該螢幕上。 ⑽ 值得-㈣是’在該第三面43也可以覆蓋有用以吸光 的黑色材料，使上述二部份的光束92，、92，，均被吸收，更 加確保不會投影和顯示於該螢幕上。 再者於本實;^例巾，存在於該人射稜鏡3與導引棱 ^ 4 H人射稜鏡3與出射棱鏡5之間’及該導引棱 鏡4與出射稜鏡5之間的該等間隙⑴、〇2、〇3是藉由多 點點膠黏合的方式產生具特定兗度的間隙，亦即，該等稜 =之間是存在—折射率為1Μ空氣介質，於本較佳實施例 的’、4用該等稜鏡與空氣的折射率來達成光束反射或折射 2的’但不用以限^本發明。舉例而言，熟知本領域之 2者為達到光束特定行進路徑的㈣，亦可於所選用的 i稜鏡之間’以特^折射率之枯合膠來填充該等間隙⑴ 、G2、G3。 根據螢幕對比值的定義是：當該等反射性光開關81位 12 200842402 於該開啟狀態下產生的一亮度除以當該等反射性光開關81 位於該關閉狀態下產生的一亮度；所以，只要分別量測該 等反射性光開關81位於上述兩種狀態下的亮度，即可計管 得知。而本發明全反射稜鏡組2因為可使該等反射性光開 關81位於該關閉狀態下所反射的光束92，均無法被投影和 顯示於該螢幕上’相較於現有的全反射稜鏡組，確實能達 到提高對比值的功效。 參閱圖5，值得一提的是，每一反射性光開關81除了 可於該開啟狀態及該關關狀態之間切換，更可切換於一平 面狀態（Flat State)或其他特定旋轉角度，該平面狀態是指該 反射性光開關81的旋轉角度是處於該開啟狀態之旋轉角度 與該關關狀態之旋轉角度的中點；雖然對比值定義的分母 是指該等反射性光開關81位於該關閉狀態下產生的一亮度 ，但在實際操作投影和顯示時，有時候該雙穩態空間光源 調變裝置8中部份的反射性光開關81是會位於該平面狀態 的；而本發明全反射稜鏡組2可使該等反射性光開關μ位 於該平面狀態下所反射的光束93如圖5所示，被該第二全 反射面42全反射’同樣達到無法被投影和顯示於該螢幕上 的功效。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 13 200842402 圖1是現有一種適用於一雙穩態空間光源調變裝置的 全反射稜鏡組之一組合示意圖，· 圖2是一組合示意圖，說明本發明可提高對比值的全 反射棱鏡組之一較佳實施例； 反射性光開關位於一開啟狀態；The surface 42 of the light beam 92, which is totally reflected at this time, is in a state of being opened with the reflective optical switches 81 to generate a path P that can be projected and displayed on the screen, and an angle D is disposed, and The third side 43 is emitted, so that it cannot be projected and displayed on the screen (not shown). In addition, the remaining minority beam 92" is not totally reflected on the second total reflection surface 42: it is directly emitted from the third surface 43, but also has a path p projected from the axis and displayed on the screen. A considerable distance, so that the partial beam 92, still cannot be projected and displayed on the screen, synthesizing the above-mentioned two partial beams 92, 92 when the reflective optical switches 81 are in the closed state. , can not be projected and displayed on the screen. (10) It is worth - (four) is 'on the third side 43 can also cover the black material useful to absorb light, so that the two parts of the beam 92, 92, are Absorption, more sure that it will not be projected and displayed on the screen. In addition, in this case, the case towel exists between the person shooting 3 and the guiding edge 4 H human shooting 3 and the outgoing prism 5 And the gaps (1), 〇2, and 〇3 between the guiding prism 4 and the exit pupil 5 are generated by a multi-point adhesive bonding to produce a gap having a specific twist, that is, the ribs = There is a presence - a refractive index of 1 Μ air medium, in the preferred embodiment of the ', 4 with the 稜鏡 and empty Refractive index to achieve beam reflection or refraction 2 'but not limited to the invention. For example, it is well known in the art that the second to achieve a specific path of the beam (four), can also be used between the selected Filling the gaps (1), G2, and G3 with the dry glue of the refractive index. The definition of the screen contrast value is: when the reflective light switch 81 bit 12 200842402 is in the open state, a brightness is divided. The brightness generated when the reflective optical switches 81 are in the off state; therefore, if the brightness of the reflective optical switches 81 in the above two states is separately measured, it can be known. The total reflection iridium group 2 is incapable of being projected and displayed on the screen because the light beam 92 reflected by the reflective optical switch 81 in the closed state can be compared with the existing total reflection 稜鏡 group. It can be achieved that the effect of increasing the contrast value can be achieved. Referring to FIG. 5, it is worth mentioning that each reflective optical switch 81 can be switched between the open state and the closed state, and can be switched to a planar state (Flat). State) or a specific rotation angle, the plane state means that the rotation angle of the reflective optical switch 81 is the midpoint of the rotation angle of the open state and the rotation angle of the off state; although the denominator defined by the comparison value refers to the reflection The optical switch 81 is located at a brightness generated in the off state, but when the projection and display are actually operated, sometimes the reflective optical switch 81 of the bistable spatial light source modulation device 8 is located in the plane state. The total reflection iridium group 2 of the present invention can make the light beam 93 reflected by the reflective optical switch μ in the planar state as shown in FIG. 5, and is totally reflected by the second total reflection surface 42. The effect of projecting and displaying on the screen is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the scope of the patent application and the description of the invention according to the present invention. The simple equivalent changes and modifications made are still within the scope of the invention. [Simple description of the diagram] 13 200842402 Fig. 1 is a schematic diagram of a combination of a total reflection 稜鏡 group suitable for a bistable spatial light source modulation device, and Fig. 2 is a combined schematic diagram illustrating the comparison value of the present invention. a preferred embodiment of the total reflection prism set; the reflective optical switch is in an open state;
及μ::是一光路示意圖’說明該較佳實施例適用㈣等 反射性光開關位於一關閉狀態；及用於該荨 圖5疋一光路示意圖，說明該 反射性光開關位於—平面狀態。 &例適用於該等And μ:: is an optical path diagram ′ illustrating that the preferred embodiment is applicable to (4) the reflective optical switch is in a closed state; and is used in the schematic diagram of the optical path of FIG. 5 to illustrate that the reflective optical switch is in a planar state. &examples apply to such
14 200842402 【主要元件符號說明】14 200842402 [Description of main component symbols]
2 ·………全反射稜鏡組 3………·入射稜鏡 31………入射面 32………第一全反射面 33*·*· — •裝置面 4 ·………導引棱鏡 41………導引連接面 42··……·第二全反射面 43·……*·第三面 5 *•…·…·出射稜鏡 5 Η........•第一連接面 52*“……第二連接面 53………出射面 8 .........…雙穩態空間光源 調變裝置. 81·········反射性光開關 9卜 92、925、92，、932 ·......... Total reflection 稜鏡 group 3.........·incident 稜鏡31.........incidence surface 32......first total reflection surface 33*·*· — • device surface 4 ·.........guide prism 41.........guide connection surface 42····second total reflection surface 43·...*·third surface 5 *•...·...·Output 稜鏡5 Η........• A connecting surface 52*"...the second connecting surface 53...the exit surface 8............the bistable spatial light source modulation device. 81·········reflective Optical switch 9 92, 925, 92, 93
••………·光束 A、Β、C、D ...........夾角 P ·………路徑 X、Y…·臨界角 Gl、G2、G3 •…···…··間隙 15••.........·Beam A, Β, C, D ...........Angle P ·.........Path X, Y...·Critical angle Gl, G2, G3 •...···... ··Gap 15