200825454 九、發明說明 【發明所屬之技術領域】 本發明關於具備將由光源所射入的光的顏色分離成至 少具有R (紅）、G (綠）、B (藍）的波長之光的色轉輪 之投影裝置用光學系統。 【先前技術】 例如代表投射型投影機的投影裝置是作爲電影館上映 用、會議等之表像用，廣泛普及中。在近年，由於具有在 各家庭內，享受以大畫面進行影片欣賞之期望、在少數人 所舉行的小會議中希望活用投影機等的要求，故，投射型 投影機的小型化受到消費者強力要求。 若採用使用數位微鏡裝置（DMD )的前投式投影機模 組（DLP ; DLP爲德州儀器公司的登錄商標）之方式的話 ，能夠將照明光學系統予以簡潔化，所以，能夠將投影機 予以小型化。因此，在近年，採用DLP方式的投影機逐漸 增加。採用使用DMD元件的DLP方式的投影機，是藉由 以色轉輪，依次使濾色器高速旋轉，使得可進行數位圖像 表現。 圖7是示意地顯示具備色轉輪的以往之投影裝置的圖 。圖8是圖7所示的色轉輪之正面圖。 如圖7所示，在以往的投影裝置1 〇〇，搭載有投影裝 置用光學系統6 0，該系統是由下述構件所構成，即，以由 放電燈1 1、與將來自於放電燈1 1的放射光L 1作爲聚光 -6 - 200825454 光線L2射出的橢圓面反射鏡1 2所構成之光源1 ;將由光 源1所射入的光分離成具有R、G、B的波長之透過光L3 的色轉輪3 ;及具備供透過色轉輪的各種顏色的透過光L3 射入的光射入面4 1之光導件4所構成的。 在以往的投影裝置1 0 0，由光源1的放電燈1 1所放射 的光L 1是受到橢圓面反射鏡1 2所反射而成爲聚光光線 L2，透過防爆玻璃2之聚光光線L2透過轉的色轉輪3之 濾色器R、G、B，使得紅、綠、蘭的各顏色之透過光L3 間隔著預定時間依次被射出，聚光於光導件4的光射入面 4 1上。射入至光導件4的內部之光是在光導件4內部的側 壁43反復反射，使剖面亮度分佈均等化，再由光射出面 42射出。透過光導件4之光L4是受到中繼透鏡5 ( 51、 52、53 )所屈折，以中繼反射鏡反射，藉此照明反射型影 像元件7。反射型影像元件7是因應投射型圖像顯示裝置 的輸入影像訊號，使光調變或切換，來將影像光L5予以 反射。影像光L5透過投影透鏡8，投影至未圖示的螢幕 ，將擴大的圖像投映於螢幕上。 在以往的投影裝置1 00，藉由色轉輪3的旋轉，已被 分離成R、G、B各顏色的光依次被照射至反射型影像元 件7。與色轉輪的顏色同步地，對應該顏色的影像訊號被 輸入至反射型影像元件7。如此，在螢幕上，R、G、B各 顏色的影像被依次投映於螢幕上。若顏色的調變周期充分 快的話，觀測者可辨認其爲彩色影像。 〔專利文獻1〕日本特開2003-222822號公報 -7- 200825454 【發明內容】 〔發明所欲解決之課題〕 但，若根據上述以往的投影裝置1 00的話，得知在投 映於螢幕上的影像會產生閃爍即產生所謂閃爍（flicker ) 現象。這種閃爍現象通常是在光源1之放電燈1 1即將使 用壽命結束時所產生的現象，因形成於電極間的放電電弧 不穩定所產生之現象。因此，在以往的投影裝置1 00，雖 光源1之放電燈1 1的累計點燈時間較短，但仍會產生上 述閃爍現象之問題。 如上述般，關於雖光源1之放電燈1 1的累計點燈時 間較短，但仍會產生上述閃爍現象之原因，雖非一定，但 可考量爲以下原因。 圖9是示意地顯示搭載於以往的投影裝置之投影裝置 用光學系統的結構，並且示意地顯示受到色轉輪所反射的 光行進的光路。其中圖9(b)擴大顯示圖9(a)的局部 。在圖9中，實線顯Tpc由糖圓面反射鏡所射出的聚光光線 L 2，虛線顯示來自於色轉輪的反射光L 6。圖1 〇是顯示來 自於使用於以往的投影裝置用光學系統的光源之放電燈的 放射光L 1之分光強度與波長的關係，並且顯示濾色器之 透過率與波長的關係。在圖1 〇中，縱軸左側顯示透過率 (單位：百分比（％ ))，縱軸右側顯示分光強度的相對 値，橫軸顯示波長（單位：nm )，虛線顯示來自於放電燈 的放射光L 1之分光強度與波長的關係，實線顯示濾色器 之光透過率與波長的關係。 -8- 200825454 如圖9 ( a )所示，以往的投影裝置用光學系統60之 光源1是由放電燈11 ;與以包圍放電燈1 1周圍的方式配 置，將由放電燈1 1所放射的光予以聚光之橢圓面反射鏡 12所構成的。如圖 9 ( b )所示，放電燈1 1是在發光管 1 1 1的內部，一對電極1 12對向配置，並且，封裝有 0.1 5mg/mm3之發光物質的水銀，如圖10所示，3 70nm〜 6 0 0 n m的可見波長區域之放射強度大的放電燈。如圖9 ( b )所示，一對電極1 12分別具備：軸部112A;及連續於 軸部112A的前端，形成較軸部112A更大徑之電極本體 部1 12B。在各電極本體部1 12B的前端，形成有朝對向的 另一電極本體部1 12B延伸之突起部1 12C。形成於各電極 本體部1 12B的突起部1 12C，爲了在各電極本體部1 12B 間良好地形成放電電弧，爲必須構件。 如圖9 ( a )所示，在搭載於以往的投影裝置之投影裝 置用光學系統60，藉由橢圓面反射鏡12所聚光的聚光光 線L2射入至色轉輪3，藉由濾色器，使R、G、B的各色 作爲透過光，射入至光導件4的光射入面4 1。然後，如圖 10所示，分離藍色光之濾色器B，可使波長400〜5 00nm 的光透過，但其他波長區域的光不會透過，而分離綠色光 之濾色器G，可使波長5 00〜600nm的光透過，但其他波 長區域的光不會透過，而分離紅色光之濾色器R， 可使 波長600nm以上的光透過，但其他波長區域的光不會透過 者。 因此，例如由放電燈所放射的5 0 0 n m以上的波長區域 200825454 之光，藉由以分離藍色光之濾色器B將一部分反射 光L6經由如圖9所示的光路照射至光源1 (放電 。然後，如圖9 ( b )所示，在放電燈1 1的電極1 由上述反射光L6照射於形成在電極本體部1 12B的 之突起部1 12C，使得突起部1 12C成爲高溫狀態而 形。如上述，爲了在相對向的各電極本體部1 1 2B 地形成放電電弧，電極本體部1 1 2B的突起部1 1 2C 結構。因此，在突起部1 12 C熔融變形之情況，在 本體部1 1 2B間所形成的放電電弧變得不穩定，會 述閃爍現象。 本發明是爲了解決上述問題而開發完成之發明 的在於提供，雖搭載於投影裝置用光學系統之放電 計點燈時間較短，但在投影裝置，可防止因電弧不 引起之閃爍現象，能夠提供高畫質的影像之投影裝 學系統。 〔用以解決課題之手段〕 爲了解決上述課題，本發明之投影裝置用光學 是具備：光源，該光源由放電燈與反射鏡所構成’ 燈之配置於發光管內的一對電極分別具備電極本體 置於電極本體部的前端側之突起部，該反射鏡爲反 電燈所放射的光；及色轉輪，其將所射入的光之顏 至少分離成具有R (紅）、綠（G )、藍（B )的波 ，其特徵爲： ，反射 iii) 12，藉 前端側 熔融變 間良好 爲必須 各電極 引起上 ，其目 燈的累 穩定所 置用光 系統， 該放電 部與設 射由放 色分別 長之光 -10- 200825454 在以包含其光軸的平面所切斷之斷面，將電極間的中 心位置設爲（A )，將由電極間的中心位置（A )朝與光 軸正交方向拉出的直線與反射鏡交叉之交點設爲（B )， 將反射鏡的第1焦點設爲（C )，將反射鏡的第2焦點設 爲（D ) ’將光軸與色轉輪的濾色器交叉之交點設爲（E ) ，並且將以連結前述（A )及前述（B )的直線（AB )與 連結前述（B )及前述（C )的直線（B C )的兩條直線所 形成的角A B C設爲0 1，將以連結前述（B )及（D )的直 線（B D )與連結前述（B )及前述（E )的直線（B E )的 兩條直線所形成的角D B E設爲0 3時， 前述光源及色轉輪是以具有符合0.30S 0 3/0 1$ 1.31 的關係之位置關係的方式加以配置。 又，如前述投影裝置用光學系統，其中，前述0 1與 前述19 3相等。 〔發明效果〕 若根據本發明之投影裝置用光學系統的話，由於具備 上述構造，故照射於一對電極之前述反射光線的光束量成 爲大致均等，故，在放電燈，即使累積點燈時間較短，亦 可抑制各突起部之熔融變形，即使放電燈的累計點燈時間 變得較長，突起部也能持續維持預期的形狀，藉此放電電 弧穩定。因此，在搭載本發明之投影裝置用光學系統的投 影裝置，能夠解決產生閃爍現象之問題。 -11 - 200825454 【實施方式】 圖1是示意地顯示本發明的投影裝置用光學系統之結 構的圖。關於與圖7所示的結構相同之結構者，省略圖示 。圖2是示意地顯示，搭載於圖1所示的投影裝置之光源 中的放電燈之電極結構的圖。 如圖1所示，本發明之投影裝置用光學系統1 0是具 備：射出聚光光線L2之光源1 ;配置於來自於光源1的 聚光光線L2之行進方向的防爆構件2 ;透過防爆構件2 之光射入，使紅、綠、藍三色的任一色依次通過之色轉輪 3;及具備供透過色轉輪3的各色之透過光L3射入的光射 入面41之光導件4。 光源1具備：射出放射光L1之放電燈1 1 ;及將由放 電燈1 1所放射的放射光L 1作爲聚光光線L2加以射出之 橢圓面反射鏡1 2。放電燈1 1具備有由石英玻璃等所構成 之發光管1 1 1，在發光管1 1 1的內部空間，由鎢所構成之 一對電極112對向配置著。如圖2所示，各電極112具備 :圓柱狀的軸部1 1 2 A ;及形成連續於軸部1 1 2 A的前端側 ，具有較軸部1 1 2 A的外徑更大的外徑之圓柱狀的電極本 體部1 12B。在各電極本體部1 12B的前端部，分別具有突 起部1 12C，該突起部具有較電極本體部1 12B的外徑更小 的外徑，且朝其他的電極本體部1 1 2B延伸。且，在各電 極本體部1 1 2B的靠近後端之外周，藉由捲繞鎢絲線，形 成線圈部112D。 橢圓面反射鏡1 2是由石英玻璃所構成，形成有前方 -12- 200825454 側開口 1 2 1及後方側開口 1 22，全體呈碗形狀，具備以光 軸X爲中心之旋轉橢圓面形狀之光反射面1 23。在光反射 面123，形成有將例如二氧化鈦（Ti02 )與二氧化矽（ Si02 )的層積層爲多層之介電質多層膜，藉以反射由放電 燈所放射的可見光。在橢圓面反射鏡1 2之具有後方側開 口 1 22的頸部1 24，安裝有由具有優良的耐熱衝擊性及電 絕緣性之由陶瓷所構成的基礎構件1 3，安裝於放電燈1 1 的一方之封裝部1 1 3的金屬製封口環1 4由基礎構件1 3朝 橢圓面反射鏡1 2的外部突出。橢圓面反射鏡1 2的材質不 限於石英玻璃，亦可使用其他的玻璃材料，亦可使用鋁等 的金屬。 防爆構件2是用來在當放電燈1 1亮燈時萬一破裂之 情況，防止發光管1 1 1或橢圓面反射鏡1 2的碎片朝位於 光源的光射出方向之其他的光學構件飛散的構件，爲例如 以石英玻璃所構成之板狀構造。防爆構件2是爲了迴避使 由光源所射出的聚光光線L2朝放電燈反射，而配置成對 與光軸X正交的直線傾斜。 色轉輪3是如圖8所示，配置成：供紅光透過的濾色 器R、供綠光透過的濾色器G、供藍光透過的濾色器B在 圓周方向依次排列。色轉輪3是如後述般，配置於比起橢 圓面反射鏡12的第2焦點D更靠近光源1的位置。當藉 由預定的旋轉驅動手段，以高速使色轉輪3旋轉時，則與 濾色器的旋轉同步地，透過光L3的顏色依次切換成紅色 、綠色、藍色，紅色、綠色、藍色的各色之光被送入至光 -13- 200825454 導件4的光射入面4 1。 光導件4爲具備成爲供透過色轉輪3的各色之透過光 L3射入的光射入面4 1之開口、與成爲將剖面照度分佈均 等化的光射出之光射出面4 2的開口之四角筒狀構造，成 爲光射入面4 1之開口配置於橢圓面反射鏡的第2焦點位 置。透過色轉輪的各色之透過光L3是由光導件4的光射 入面41射入，在光導件4的側壁4 3之內面反復反射，作 爲剖面照度分佈均等化的光束L4由光射出面42射出。 圖3是示意地顯示本發明的投影裝置用光學系統之光 源與色轉輪的位置關係，顯示藉由使投影裝置用光學系統 10對大地正交並且包含光軸X之平面切斷的斷面。再者 ，在圖3中，關於放電燈及燈導件，省略其圖示。 本發明的投影裝置用光學系統1 0，放電燈1 1的電極 間之中心位置A配置於比起橢圓面反射鏡1 2的第1焦點 位置C更靠近色轉輪3，而色轉輪3配置於比起橢圓面反 射鏡12的第2焦點位置D更靠近光源1。色轉輪3配置 於比起橢圓面反射鏡12的第2焦點位置D更靠近光源1 的理由是爲了縮小光導件4的光射入面41，在橢圓面反射 鏡12的第2焦點位置D配置光導件4的光射入面4 1爲佳 之故。再者，亦可將色轉輪3配置於比起橢圓面反射鏡1 2 的第2焦點位置更靠近光導件4側的位置。 如圖3的斷面所示，本發明之投影裝置用光學系統1 〇 ，當將放電燈1 1的電極間之中心位置設爲A，將由電極 的中心位置A朝與光軸X正交的方向拉出之直線與橢圓 -14- 200825454 面反射鏡1 2交叉之交點設爲B，將橢圓面反射鏡1 2的第 1焦點位置設爲C，進一步將橢圓面反射鏡的第2焦點位 置設爲D，光軸X與色轉輪3的濾色器交叉的交點設爲E 時，連結A及B的直線與連結B及C的直線之兩條直線 所成的角AB C ( 0 1 )成爲與連結B及D的直線與連結B 及E的直線之兩條直線所成的角DBE ( 0 3 )大致相等地 ，配置放電燈1 1、橢圓面反射鏡1 2、色轉輪3。 在此，上述放電燈的電極間之中心位置A是以下述的 方式所決定。如圖2所示，拉出分別連結對向的一對電極 1 1 2所各自具備之突起部1 1 2 C的最短直線K，將該最短直 線K的中間作爲電極間的中心位置A。 又，如圖1所示，一般，在藉由光源1所射出的聚光 光線L2之光路上（橢圓面反射鏡12與色轉輪3之間）， 配置有由石英玻璃所構成的防爆構件2之情況、及雖未圖 示，在色轉輪3，於與光導件4相對向側之面形成蒸鍍面 的情況時，比起非這些情況，光路長度長爲眾所皆知。詳 細而言，一般，當將在由光源1所射出的聚光光線L2之 光路上未配置有防爆構件2之情況（或在色轉輪3之與光 源1對向側的面形成有蒸鍍面的情況）之光路長度設爲 R1，與此情況相反，當當將在由光源1所射出的聚光光線 L2之光路上配置有防爆構件2之情況（或在色轉輪3之 與光導件4對向側的面配置有蒸鍍面的情況）之光路長度 設爲R2，當將光路長度的差設爲△ R ( =R2-R1 )時，△ R 是在下述的數學式1的關係成立爲眾所皆知。 -15- 200825454 (數學式1 ) Δ R= ( 1 -1 /η ) xt [單位··毫米（mm)] 即’在由光源1所射出的聚光光線L2之光路上配置 有防爆構件2的情況時，將橢圓面反射鏡1 2的第2焦點 位置設爲D ’，將光軸X與防爆構件2交叉之交點設爲E， ’與此相反地，在由光源1所射出的聚光光線L2之光路 上未配置有防爆構件2的情況時，將橢圓面反射鏡1 2的 第2焦點位置設爲D，將光軸X與防爆構件2交叉之交點 設爲E時’ D及E的位置根據下述的數學式2及3所示的 關係加以決定。 (數學式2 )200825454 IX. OBJECT OF THE INVENTION [Technical Field] The present invention relates to a color rotation having light that separates a color of light incident by a light source into light having a wavelength of at least R (red), G (green), and B (blue) An optical system for a projection device of a wheel. [Prior Art] For example, a projection apparatus representing a projection type projector is widely used as a representation for a movie theater display, a conference, or the like. In recent years, the miniaturization of projection projectors has been strongly influenced by consumers because they have the expectation of enjoying movies with large screens and the desire to use projectors in small meetings held by a small number of people. Claim. If a front projection projector module (DLP; DLP is a registered trademark of Texas Instruments) using a digital micromirror device (DMD) is used, the illumination optical system can be simplified, so that the projector can be given miniaturization. Therefore, in recent years, projectors using the DLP method have gradually increased. A DLP type projector using a DMD element sequentially rotates a color filter at a high speed by a color wheel so that digital image representation can be performed. Fig. 7 is a view schematically showing a conventional projection apparatus including a color wheel; Figure 8 is a front elevational view of the color wheel of Figure 7; As shown in Fig. 7, in the conventional projection apparatus 1A, a projection device optical system 60 is mounted, and the system is constituted by a discharge lamp 1 1 and a discharge lamp. The radiation L 1 of 1 1 is used as the light source 1 composed of the ellipsoidal mirror 1 2 emitted by the light ray -6 - 200825454 ray L2; the light incident by the light source 1 is separated into the wavelengths having the wavelengths of R, G, and B The color wheel 3 of the light L3; and the light guide 4 having the light incident on the surface 41 for the transmitted light L3 of the various colors transmitted through the color wheel. In the conventional projection apparatus 100, the light L1 emitted from the discharge lamp 1 1 of the light source 1 is reflected by the ellipsoidal mirror 12 and becomes the condensed ray L2, and the condensed light L2 transmitted through the explosion-proof glass 2 is transmitted. The color filters R, G, and B of the rotating color wheel 3 are such that the transmitted light L3 of each of the red, green, and blue colors is sequentially emitted with a predetermined time interval, and is concentrated on the light incident surface 4 of the light guiding member 4. on. The light incident into the inside of the light guiding member 4 is repeatedly reflected by the side wall 43 inside the light guiding member 4, and the cross-sectional luminance distribution is equalized, and is emitted from the light emitting surface 42. The light L4 transmitted through the light guiding member 4 is bent by the relay lens 5 (51, 52, 53) to be reflected by the relay mirror, thereby illuminating the reflective image element 7. The reflective image element 7 reflects or changes the light in response to an input image signal of the projection type image display device to reflect the image light L5. The image light L5 is transmitted through the projection lens 8 and projected onto a screen (not shown), and the enlarged image is projected on the screen. In the conventional projection apparatus 100, the light that has been separated into the respective colors of R, G, and B is sequentially irradiated to the reflective image element 7 by the rotation of the color wheel 3. In synchronism with the color of the color wheel, the image signal corresponding to the color is input to the reflective image element 7. Thus, on the screen, images of the R, G, and B colors are sequentially projected on the screen. If the color modulation period is sufficiently fast, the observer can recognize it as a color image. [Problem to be Solved by the Invention] However, according to the above-described conventional projection apparatus 100, it is known that it is projected on the screen. The flickering of the image produces a so-called flicker phenomenon. This flickering phenomenon is usually a phenomenon which occurs when the discharge lamp 1 1 of the light source 1 is about to end its life, and is caused by the instability of the discharge arc formed between the electrodes. Therefore, in the conventional projection apparatus 100, the cumulative lighting time of the discharge lamp 1 1 of the light source 1 is short, but the above-described flicker phenomenon still occurs. As described above, although the cumulative lighting time of the discharge lamp 1 1 of the light source 1 is short, the above-described flickering phenomenon may occur, although it is not constant, but the following factors may be considered. Fig. 9 is a view schematically showing the configuration of an optical system for a projection apparatus mounted on a conventional projection apparatus, and schematically showing an optical path through which light reflected by a color wheel travels. Wherein Fig. 9(b) is enlarged to show a part of Fig. 9(a). In Fig. 9, the solid line shows that the Tpc is a concentrated light ray L 2 emitted from the sugar round mirror, and the broken line shows the reflected light L 6 from the color wheel. Fig. 1 is a view showing the relationship between the light splitting intensity of the emitted light L 1 of the discharge lamp used in the conventional optical system for a projection apparatus and the wavelength, and showing the relationship between the transmittance of the color filter and the wavelength. In Fig. 1, 透过, the left side of the vertical axis shows the transmittance (unit: percentage (%)), the right side of the vertical axis shows the relative 値 of the spectral intensity, the horizontal axis shows the wavelength (unit: nm), and the dotted line shows the emitted light from the discharge lamp. The relationship between the light intensity of L 1 and the wavelength, and the solid line shows the relationship between the light transmittance of the color filter and the wavelength. -8- 200825454 As shown in Fig. 9 (a), the light source 1 of the conventional optical system for projection apparatus 60 is disposed by the discharge lamp 11 and is disposed around the discharge lamp 1 1 and is radiated by the discharge lamp 1 1 The light is composed of an ellipsoidal mirror 12 that collects light. As shown in Fig. 9 (b), the discharge lamp 1 1 is disposed inside the arc tube 1 1 1 , and the pair of electrodes 1 12 are disposed opposite to each other, and the mercury of 0.1 5 mg/mm 3 of the luminescent material is encapsulated, as shown in FIG. 10 . A discharge lamp having a large radiation intensity in a visible wavelength region of 3 70 nm to 600 nm is shown. As shown in Fig. 9 (b), each of the pair of electrodes 1 12 includes a shaft portion 112A, and an electrode body portion 12B which is continuous with the tip end of the shaft portion 112A and has a larger diameter than the shaft portion 112A. At the tip end of each electrode main body portion 12B, a projection portion 1 12C that extends toward the other electrode main body portion 12B is formed. The projections 1 12C formed in the respective electrode main bodies 1 12B are necessary members in order to form a discharge arc well between the respective electrode main portions 1 12B. As shown in FIG. 9( a ), in the optical system 60 for a projection apparatus mounted on a conventional projection apparatus, the condensed light L2 collected by the ellipsoidal mirror 12 is incident on the color wheel 3, and filtered. Each of the colors of R, G, and B is transmitted as light, and is incident on the light incident surface 41 of the light guide 4. Then, as shown in FIG. 10, the color filter B of the blue light is separated to transmit light having a wavelength of 400 to 500 nm, but the light of other wavelength regions is not transmitted, and the color filter G of the green light is separated. Light having a wavelength of 00 to 600 nm is transmitted, but light of other wavelength regions is not transmitted, and the color filter R of the red light is separated to transmit light having a wavelength of 600 nm or more, but light of other wavelength regions is not transmitted. Therefore, for example, the light of the wavelength region 200825454 of 500 nm or more emitted by the discharge lamp is irradiated to the light source 1 via the optical path shown in FIG. 9 by the color filter B separating the blue light ( Then, as shown in Fig. 9 (b), the electrode 1 of the discharge lamp 11 is irradiated to the projection 1 12C formed on the electrode main portion 1 12B by the reflected light L6, so that the projection 1 12C becomes a high temperature state. As described above, in order to form a discharge arc in the opposing electrode main body portions 1 1 2B, the protrusion portion 1 1 2C of the electrode main body portion 1 1 2B is structured. Therefore, in the case where the protrusion portion 1 12 C is melt-deformed, The discharge arc formed between the main body portions 1 1 2B is unstable, and a flicker phenomenon is described. The present invention has been developed in order to solve the above problems, and is provided in a discharge measuring device mounted on an optical system for a projection device. The lamp has a short lamp time, but in the projection device, it can prevent the flickering phenomenon caused by the arc, and can provide a high-quality image projection and loading system. [Means for solving the problem] In order to solve the above problem, The optical device for a projection apparatus according to the invention includes a light source configured by a discharge lamp and a mirror, and each of the pair of electrodes disposed in the arc tube has a protrusion portion on the front end side of the electrode body portion of the electrode body. The mirror is a light emitted by the reverse lamp; and a color wheel that separates at least the light of the incident light into waves having R (red), green (G), and blue (B), and is characterized by: Reflection iii) 12, by the front end side melting change is good, it is necessary to cause the respective electrodes to be on, and the light system of the head lamp is stabilized, and the discharge portion and the light emitted by the coloring are respectively longer than the light transmission - 200825454 The cross section cut by the plane including the optical axis is set to (A) at the center position between the electrodes, and the straight line drawn from the center position (A) between the electrodes in the direction orthogonal to the optical axis intersects the mirror. The intersection point is (B), the first focus of the mirror is (C), and the second focus of the mirror is (D) 'The intersection of the optical axis and the color filter of the color wheel is set to ( E ) , and will be a line (AB ) linking the aforementioned (A ) and the aforementioned (B) The angle ABC formed by the two straight lines connecting the straight line (BC) of the above (B) and the above (C) is "0", and the straight line (BD) connecting the above (B) and (D) is connected to the above (B). When the angle DBE formed by the two straight lines of the straight line (BE) of the above (E) is 0 3, the light source and the color wheel are in a positional relationship having a relationship of 0.30S 0 3/0 1$ 1.31. The way to configure it. Further, in the optical system for a projection apparatus, the "0" is equal to the 193. [Effect of the Invention] According to the optical system for a projection device of the present invention, since the above-described structure is provided, the amount of the light beam irradiated to the pair of electrodes is substantially equal, so that even the accumulated lighting time is higher in the discharge lamp. In short, it is also possible to suppress the melt deformation of each of the projections, and even if the cumulative lighting time of the discharge lamp becomes longer, the projections can continue to maintain the desired shape, whereby the discharge arc is stabilized. Therefore, the problem of occurrence of flicker can be solved by the projection apparatus on which the optical system for a projection apparatus of the present invention is mounted. 1-1 - 200825454 [Embodiment] FIG. 1 is a view schematically showing the configuration of an optical system for a projection apparatus of the present invention. The same configurations as those shown in Fig. 7 are omitted. Fig. 2 is a view schematically showing an electrode structure of a discharge lamp mounted in a light source of the projection apparatus shown in Fig. 1; As shown in Fig. 1, the optical system 10 for a projection apparatus according to the present invention includes a light source 1 that emits a concentrated light beam L2, an explosion-proof member 2 that is disposed in a traveling direction of the concentrated light beam L2 from the light source 1, and an explosion-proof member. 2 light is incident, and any one of red, green, and blue colors passes through the color wheel 3 in sequence; and a light guide member having a light incident surface 41 through which the transmitted light L3 of each color of the color wheel 3 is transmitted 4. The light source 1 includes a discharge lamp 1 1 that emits the emitted light L1, and an elliptical mirror 12 that emits the emitted light L1 emitted from the discharge lamp 1 as the collected light L2. The discharge lamp 1 1 is provided with an arc tube 1 1 1 made of quartz glass or the like, and is disposed opposite to the pair of electrodes 112 made of tungsten in the internal space of the arc tube 1 1 1 . As shown in Fig. 2, each of the electrodes 112 includes a cylindrical shaft portion 1 1 2 A and a front end side which is continuous with the shaft portion 1 1 2 A and has a larger outer diameter than the shaft portion 1 1 2 A. The cylindrical electrode body portion 12B of the diameter. Each of the electrode body portions 1 12B has a protruding portion 1 12C having a smaller outer diameter than the outer diameter of the electrode main portion 1 12B and extending toward the other electrode main portions 1 1 2B. Further, the coil portion 112D is formed by winding a tungsten wire around the outer periphery of each of the electrode main portions 1 1 2B. The elliptical mirror 12 is made of quartz glass and has a front side -12-200825454 side opening 1 2 1 and a rear side opening 1 22, and has a bowl shape as a whole, and has a rotating elliptical shape centered on the optical axis X. Light reflecting surface 1 23 . On the light reflecting surface 123, a dielectric multilayer film in which a laminated layer of, for example, titanium oxide (TiO 2 ) and cerium oxide (SiO 2 ) is laminated is formed to reflect visible light emitted from the discharge lamp. In the neck portion 14 of the elliptical mirror 12 having the rear side opening 1 22, a base member 13 made of ceramic having excellent thermal shock resistance and electrical insulation is attached to the discharge lamp 1 1 . The metal sealing ring 14 of the one package portion 1 1 3 protrudes from the base member 13 toward the outside of the ellipsoidal mirror 1 2 . The material of the elliptical mirror 12 is not limited to quartz glass, and other glass materials may be used, and a metal such as aluminum may be used. The explosion-proof member 2 is used to prevent the fragments of the arc tube 11 or the ellipsoidal mirror 12 from scattering toward other optical members located in the light-emitting direction of the light source in the event of a breakage of the discharge lamp 1 1 when it is turned on. The member is, for example, a plate-like structure composed of quartz glass. The explosion-proof member 2 is disposed so as to avoid reflection of the concentrated light ray L2 emitted from the light source toward the discharge lamp, and is arranged to be inclined with respect to a line orthogonal to the optical axis X. As shown in Fig. 8, the color wheel 3 is arranged such that a color filter R for transmitting red light, a color filter G for transmitting green light, and a color filter B for transmitting blue light are sequentially arranged in the circumferential direction. The color wheel 3 is disposed closer to the light source 1 than the second focus D of the elliptical mirror 12 as will be described later. When the color wheel 3 is rotated at a high speed by a predetermined rotation driving means, the color of the transmitted light L3 is sequentially switched to red, green, blue, red, green, and blue in synchronization with the rotation of the color filter. The light of each color is sent to the light incident surface 4 1 of the light guide 13 - 200825454. The light guide 4 is provided with an opening of the light incident surface 41 that is incident on the transmitted light L3 of the respective colors of the transmission color wheel 3, and an opening of the light exit surface 42 that emits light that equalizes the cross-sectional illuminance distribution. In the rectangular tubular structure, the opening of the light incident surface 41 is disposed at the second focus position of the elliptical mirror. The transmitted light L3 of each color transmitted through the color wheel is incident on the light incident surface 41 of the light guide 4, and is repeatedly reflected on the inner surface of the side wall 43 of the light guide 4, and the light beam L4 which is equalized as the cross-sectional illuminance distribution is emitted by the light. Face 42 is shot. 3 is a view schematically showing a positional relationship between a light source and a color wheel of the optical system for a projection apparatus of the present invention, and showing a section cut by a plane orthogonal to the optical system 10 and including a plane of the optical axis X by the optical system 10 for a projection apparatus. . In addition, in FIG. 3, the illustration of the discharge lamp and the lamp guide is abbreviate|omitted. In the optical system 10 for a projection apparatus of the present invention, the center position A between the electrodes of the discharge lamp 1 1 is disposed closer to the color wheel 3 than the first focus position C of the ellipsoidal mirror 12, and the color wheel 3 It is disposed closer to the light source 1 than the second focus position D of the elliptical mirror 12. The reason why the color wheel 3 is disposed closer to the light source 1 than the second focus position D of the ellipsoidal mirror 12 is to reduce the light incident surface 41 of the light guide 4 at the second focus position D of the ellipsoidal mirror 12. It is preferable to arrange the light incident surface 41 of the light guiding member 4. Further, the color wheel 3 may be disposed closer to the light guide 4 than the second focus position of the ellipsoidal mirror 1 2 . As shown in the cross section of Fig. 3, in the optical system 1 of the projection apparatus of the present invention, when the center position between the electrodes of the discharge lamp 11 is A, the center position A of the electrode is orthogonal to the optical axis X. The direction in which the direction is pulled out is set to B at the intersection of the ellipse-14-200825454 facet mirror 1 2, the first focus position of the elliptical mirror 12 is set to C, and the second focus position of the elliptical mirror is further set. When D is set, the intersection of the optical axis X and the color filter of the color wheel 3 is set to E, and the angle between the straight line connecting A and B and the straight line connecting B and C is AB C ( 0 1 The discharge lamp 1 1 , the elliptical mirror 1 2 , and the color wheel 3 are disposed substantially equal to the angle DBE ( 0 3 ) formed by the two straight lines connecting the lines B and D and the straight lines connecting the lines B and E. . Here, the center position A between the electrodes of the discharge lamp is determined in the following manner. As shown in Fig. 2, the shortest straight line K of the projections 1 1 2 C respectively provided between the pair of opposed electrodes 1 1 2 is pulled out, and the middle of the shortest straight line K is defined as the center position A between the electrodes. Further, as shown in FIG. 1, generally, an explosion-proof member made of quartz glass is disposed on the optical path of the concentrated light ray L2 emitted from the light source 1 (between the ellipsoidal mirror 12 and the color wheel 3). In the case of 2, and not shown, when the color wheel 3 forms a vapor deposition surface on the surface facing the light guide 4, the length of the optical path is known to be longer than these. In detail, generally, when the explosion-proof member 2 is not disposed on the optical path of the concentrated light ray L2 emitted from the light source 1 (or the surface of the color wheel 3 opposite to the light source 1 is formed with vapor deposition) In the case of the surface, the length of the optical path is set to R1. Contrary to this, when the explosion-proof member 2 is disposed on the optical path of the concentrated light L2 emitted from the light source 1 (or the light guide 3 and the light guide) 4 when the vapor deposition surface is disposed on the surface on the opposite side, the optical path length is R2, and when the difference in optical path length is ΔR (=R2-R1), ΔR is the relationship of the following mathematical expression 1. The establishment is well known. -15- 200825454 (Expression 1) Δ R = ( 1 -1 /η ) xt [unit··mm (mm)] That is, 'explosion-proof member 2 is disposed on the optical path of the concentrated light beam L2 emitted from the light source 1 In the case of the elliptical mirror 12, the second focus position is D', and the intersection where the optical axis X intersects the explosion-proof member 2 is E, and on the contrary, the light emitted by the light source 1 When the explosion-proof member 2 is not disposed on the optical path of the light beam L2, the second focus position of the elliptical mirror 12 is D, and the intersection of the optical axis X and the explosion-proof member 2 is set to E. The position of E is determined according to the relationship shown in Mathematical Formulas 2 and 3 below. (Math 2)
D = D’- △ R (數學式3 )D = D'- △ R (Math 3)
Ε = Ε’- Δ R 且，在色轉輪的蒸鍍面形成於與光導件對向側之情況 ，在數學式2及3的AR，亦包含因色轉輪的厚度所產生 之光路長度的延長。 -16- 200825454 針對本發明的投影裝置用光學系統1 〇之光源1與色 轉輪3的位置關係，將具體的數値例如以下所示。放電燈 1 1的電極間之中心位置Α與橢圓面反射鏡1 2的第1焦點 位置C之分離距離AC爲0.01mm〜0.3mm之範圍。光軸X 和色轉輪3交叉之交點E與橢圓面反射鏡1 2的第2焦點 位置D之分離位置DE爲0.1mm〜5mm之範圍。 再者，本發明的投影裝置用光學系統丨〇之橢圓面反 射鏡1 2是利用將石英玻璃或金屬以形成預定的形狀之方 式，藉由例如模具等予以成形來加以製造的。但，實際所 製造的橢圓面反射鏡，會有例如第1焦點位置C等與所設 計的橢圓面反射鏡1 2微妙地差異的可能性。因此，上述 01與Θ3是考量在橢圓面反射鏡12，會產生製造上的誤 差，不僅是兩角的値完全一致之情況，亦包含符合下述的 數學式4之情況。本發明者們根據進行後述的實驗確認了 ，藉由符合數學式4的數値範圍，能夠迴避設置於電極本 體部的突起部1 1 2C熔融變形。 (數學式4 ) 0.30^03/01^1.31 圖4是示意地顯示在本發明的投影裝置用光學系統， 未透過濾色器，而受到濾色器所反射的光朝光源進行之光 路。在圖4中，實線顯示橢圓面反射鏡1 2所射出的聚光 -17- 200825454 光線L2，虛線顯示來自於色轉輪的反射光L6。 若根據本發明之投影裝置用光學系統1 〇的話’ S # 源1與色轉輪3配置成符合上述θ 1與0 3大致相等的位 置關係，所以，如圖4所示，藉由濾色器R、G、B所反 射的反射光L6返回成形成於在放電燈11的發光管Π 1內 相對向的一對電極1 1 2間之放電電弧，不會照射至設置於 各電極本體部112B之各突起部112C。因此，雖放電燈11 的累計點燈時間較短，也能抑制設置於各電極本體部 11 2B的突起部112C熔融變形之缺失產生。其結果，即使 放電燈1 1的累計點燈時間變得較長，也能藉由各突起部 1 1 2C持續維持預期的形狀，使放電電弧穩定，故，在投 影裝置，能夠解決所產生的閃爍現象之問題。這理由如以 下所述。 圖5是示意地顯示獲得本發明的投影裝置用光學系統 之效果的理由。實線顯示在放電燈1 1的電極間之中心位 置A與橢圓面反射鏡1 2的第1焦點C的情況時，由A所 放射的光線之路徑，虛線顯示在放電燈1 1的電極間之中 心位置A與橢圓面反射鏡1 2的第1焦點C分離的情況時 ，由A所放射的光線之路徑。Μ爲在橢圓面反射鏡1 2上 的Β點，拉出成接觸於橢圓面反射鏡1 2之接線，Ν爲與 接線Μ正交之法線。Ε = Ε'- Δ R and the vapor deposition surface of the color wheel is formed on the opposite side of the light guide member, and the AR of Mathematical Formulas 2 and 3 also includes the optical path length due to the thickness of the color wheel. Extension. In the positional relationship between the light source 1 and the color wheel 3 of the optical system 1 for a projection apparatus according to the present invention, a specific number is shown, for example, below. The separation distance AC between the center position 电极 between the electrodes of the discharge lamp 1 1 and the first focus position C of the elliptical mirror 12 is in the range of 0.01 mm to 0.3 mm. The separation position DE between the intersection E of the optical axis X and the color wheel 3 and the second focus position D of the elliptical mirror 12 is in the range of 0.1 mm to 5 mm. Further, the ellipsoidal mirror 1 2 for the optical system for a projection apparatus of the present invention is manufactured by molding a quartz glass or a metal into a predetermined shape by, for example, a mold. However, the elliptical mirror actually manufactured may have a subtle difference between the first focus position C and the like and the designed elliptical mirror 12, for example. Therefore, the above-mentioned 01 and Θ3 are considered to be in the elliptical mirror 12, and manufacturing errors are caused, not only in the case where the ridges of the two corners are completely identical, but also in the case of the following Mathematical Formula 4. According to the experiment described later, the inventors have confirmed that the protrusions 1 1 2C provided in the electrode body portion can be prevented from being melt-deformed by the numerical range of the mathematical expression 4. (Math. 4) 0.30^03/01^1.31 Fig. 4 is a view schematically showing an optical path of the optical system for a projection apparatus according to the present invention, in which the light reflected by the color filter is directed toward the light source without passing through the color filter. In Fig. 4, the solid line shows the condensed light -17-200825454 ray L2 emitted by the ellipsoidal mirror 12, and the broken line shows the reflected light L6 from the color wheel. According to the optical system 1 for a projection apparatus according to the present invention, the 'S# source 1 and the color wheel 3 are arranged to conform to the positional relationship in which the above θ 1 and 0 3 are substantially equal, and therefore, as shown in FIG. 4, by color filter The reflected light L6 reflected by the devices R, G, and B is returned to a discharge arc formed between the pair of electrodes 1 1 2 opposed to the inside of the arc tube 1 of the discharge lamp 11, and is not irradiated to the main body portion of each electrode. Each of the protrusions 112C of 112B. Therefore, even if the cumulative lighting time of the discharge lamp 11 is short, it is possible to suppress the occurrence of the lack of melt deformation of the projection 112C provided in each of the electrode main portions 11 2B. As a result, even if the cumulative lighting time of the discharge lamp 1 1 is long, the discharge arc can be stabilized by maintaining the desired shape of each of the projections 1 1 2C, so that the projection device can solve the problem. The problem of flickering. The reason is as follows. Fig. 5 is a view schematically showing the reason why the effect of the optical system for a projection apparatus of the present invention is obtained. When the solid line indicates the center position A between the electrodes of the discharge lamp 11 and the first focus C of the elliptical mirror 12, the path of the light emitted by A and the broken line are shown between the electrodes of the discharge lamp 11. When the center position A is separated from the first focus C of the elliptical mirror 12, the path of the light emitted by A is. Μ is the defect on the ellipsoidal mirror 1 2 and is pulled out to contact the ellipsoidal mirror 12, which is the normal to the junction Μ.
如圖5的實線所示，在放電燈1 1的電極間之中心位 置Α與第1焦點位置C 一致的情況，由第1焦點位置C 所放射的光線L1對橢圓面反射鏡12以射入角成爲CBN -18- 200825454 的方式射入，受到橢圓面反射鏡1 2所反射的聚光光線L2 聚光於第2焦點位置D，形成具有與射入角CBN相等的反 射角N B D。 另外，如圖5的虛線所示，在將放電燈1 1的電極間 之中心位置A配置於較第1焦點位置C更靠近色轉輪3之 情況，由電極間的中心位置A所放射的光線L 1 ’對橢圓面 反射鏡12以射入角成爲ABN的方式射入，以具有與射入 角ABN相等的反射角NBE的方式，受到橢圓面反射鏡12 所反射的聚光光線L2 ’射出。在此，以虛線所示的聚光光 線L2’，射入角ABN的大小爲比起前述射入角CBN，小了 相當於角A B C之量，因此，反射角N B E的大小也爲比起 前述反射角NBD，小了相當於角 ABC之量，比起橢圓面As shown by the solid line in FIG. 5, when the center position Α between the electrodes of the discharge lamp 1 1 coincides with the first focus position C, the light ray L1 emitted from the first focus position C is incident on the ellipsoidal mirror 12 The entrance angle is incident on CBN -18-200825454, and the concentrated light ray L2 reflected by the ellipsoidal mirror 12 is condensed at the second focus position D to form a reflection angle NBD equal to the incident angle CBN. Further, as shown by the broken line in FIG. 5, when the center position A between the electrodes of the discharge lamp 1 1 is disposed closer to the color wheel 3 than the first focus position C, the center position A between the electrodes is radiated. The ray L 1 ' is incident on the ellipsoidal mirror 12 so that the incident angle is ABN, and the condensed ray L2 ' reflected by the ellipsoidal mirror 12 is received so as to have a reflection angle NBE equal to the incident angle ABN. Shoot out. Here, the size of the incident angle ABN, which is indicated by a broken line, is smaller than the incident angle CBN by an amount corresponding to the angle ABC. Therefore, the magnitude of the reflection angle NBE is also larger than the above. The reflection angle NBD is smaller than the amount of the angle ABC, compared to the elliptical surface.
反射鏡1 2的第2焦點位置D，聚光於靠近光源1之位置E 〇 因此，在本發明之投影裝置用光學系統，藉由將色轉 輪3的蒸鍍面配置於聚光光線L2 ’聚光的位置E (即比起 橢圓面反射鏡12的第2焦點位置D，更靠近相當於角 ABC的大小之量的光源1的位置），使得由橢圓面反射鏡 12所射出的聚光光線L2’對色轉輪3以射入角BEX射入 ，並且，以具有相等於射入角BEX的反射角FEX之方式 藉由色轉輪3所反射的光線L 6被聚光於電極間的中心位 置A。藉此，在本發明之投影裝置用光學系統，光線L 6 不會偏移照射至設置於一對電極112之各突起部U2C的 其中任一方，能夠解決各突起部1 1 2C熔融變形之虞。 -19- 200825454 由以上可知，在本發明之投影裝置用光學系 各突起部Π 2C持續維持預期的形狀，使得放電 ，故，可解決在投影裝置中會產生閃爍現象之問 <實驗例1> 以下，說明關於爲了確認本發明的效果所進 實驗例。 根據圖1所示的結構，製作本發明的實施例 置用光學系統。在此投影裝置用光學系統，將放 極間之中心位置設爲A，將由電極間的中心位置 軸X正交的方向所拉出之直線與橢圓面反射鏡交 設爲B，將橢圓面反射鏡的第1焦點設爲C，將 射鏡的第2焦點設爲D，將光軸X與色轉輪交叉 爲E時，連結A及B的直線與連結B及C的直 直線所成的角AB C ( 0 1 )之値、和連結B及D 連結B及E的直線之兩條直線所成的角DBE (( 大致一致地，配置放電燈1 1、橢圓面反射鏡1 2、 〇 實施例的投影裝置用光學系統具有以下的規; 橢圓面反射鏡1 2，第1焦點距離爲8 · 1 mm， 距離爲 64.1mm。放電燈 11在發光管 丨 〇.16mg/mm3之水銀，電極間距離爲1.0mm。防爆 厚度2.8mm，在由橢圓面反射鏡12的前方側開I 離15.9mm之位置，配置成在對與光軸X正交的 統，由於 電弧穩定 行之第1 之投影裝 電燈的電 A朝與光 叉的交點 橢圓面反 的交點設 線之兩條 的直線與 1 3 )之値 色轉輪3 第2焦點 3封裝有 構件2爲 ]121 分 直線傾斜 -20- 200825454 10°之狀態下，與光軸X交叉。色轉輪3爲在由橢圓面反 射鏡12的前方側開口 121分離26.6mm之位置，配置成蒸 鍍面在光源側與光軸X正交。放電燈1 1的電極間之中心 位置A與橢圓面反射鏡丨2的第1焦點位置C之分離距離 AC爲0.1mm。光軸X與色轉輪3交叉之交點E與橢圓面 反射鏡12的第2焦點位置D之分離距離DE爲1.3mm。 實施例之投影裝置用光學系統，角ABC ( θ 1 )爲0.3 96。 ，角DBE( 03)爲〇.304。，0 1的値與03的値大致一致 〇 又’製作3種類的比較例之投影裝置用光學系統，其 除了上述角DBE ( 0 3 )的値不同以外，其餘與上述實施 例之投影裝置用光學系統相同的結構、規格。比較例1的 投影裝置用光學系統，0 3爲0 · 0 5。。比較例2的投影裝置 用光學系統，0 3爲0.8 4。。即，比較例1至3的投影裝置 用光學系統，其是與0 1的値與0 3的値大致一致的實施 例之投影裝置用光學系統不同，0 1的値與0 3的値具有 大幅度差異。 針對上述實施例的投影裝置用光學系統及比較例1至 3的投影裝置用光學系統，在放電燈外，以接收射入至電 極的光線之方式，配置利用光纖之受光裝置，對藉由濾色 器R、G、B朝放電燈1 1方向反射的反射光l 6中，照射 至位於橢圓面反射鏡1 2的前方側開口丨2 1側之電極（前 方側的電極）及橢圓面反射鏡1 2的後方側開口 1 2 2側之 電極（後方側的電極）之光束量進行測定。其結果顯示於 -21 - 200825454 圖6。 圖6是顯示當將來自於放電燈1 1的放射光L 1之全光 束量設爲1時，照射至電極1 1 2的光束量之相對値與角 D BE ( 0 3 )之關係。在圖6中，縱軸顯示照射於電極1 12 的光束量之相對値，橫軸顯示角DBE ( 0 3 )(單位：° ( 度））的値。在圖6，實線顯示照射於前方側的電極之光 束量的相對値，虛線顯示照射於後方側的電極之光束量的 相對値。 如圖6所示，比較例1的投影裝置用光學系統，照射 於前方側的電極之光束量的相對値爲〇 . 〇 2 4，相對於此， 照射於後方側的電極之光束量的相對値爲0.1 0 7。又，比 較例2的投影裝置用光學系統，照射於前方側的電極之光 束量的相對値爲〇 · 1 〇 8，相對於此，照射於後方側的電極 之光束量的相對値爲0· 03 1。且，比較例3的投影裝置用 光學系統’照射於前方側的電極之光束量的相對値爲 〇. 1 60，相對於此，照射於後方側的電極之光束量的相對 値爲0 · 0 1 3。 如此實驗結果所示，若根據0 1的値與0 3的値差異 大之比較例1至3的投影裝置用光學系統的話，由於照射 於前方側的電極或後方側的電極中的任一者之反射光L6 大，故，會有設置於相對向的電極本體部中的任一方之突 起部熔融變形之虞，無法解決形成於放電燈的電極間之放 電電弧不穩定之虞。因此，在搭載有比較例丨至3的投影 裝置用光學系統之投影裝置，無法解決產生閃爍現象之問 -22- 200825454 題。 相對於此，實施例的投影裝置用光學系統， 方側的電極之光束量與照射於後方側的電極之光 對値均爲〇. 〇 5左右。如此實驗結果所示，反射为 對前方側的電極或後方側的電極中任一方偏移照 電極所照射之光數量爲均等，因此，不會有設置 的電極本體部中的任一方之突起部熔融變形之虞 決形成放電燈的電極間之放電電弧不穩定之虞。 搭載有實施例的投影裝置用光學系統之投影裝置 決產生閃爍現象之問題。 <實施例2> 以下，說明關於爲了確認本發明的效果所進 實驗例。製作6種類的投影裝置用光學系統（實 6〕各1 〇個，總計6 0個（這些投影裝置用光學 了角D B E ( 0 3 )以外，其餘均與實施例1具有 構、規格）。實施例1至6的投影裝置用光學系 由以下的表1所示，0 1的値均爲〇. 3 9 6，但0 3 ，分別爲 0.05、 0.12、 0.30、 0.52、 0.57、 0.84。 針對實施例1至6的各投影裝置用光學系統 燈1 1亮燈預定時間後，以目視確認設置於電極 起部1 1 2 C是否熔融變形。其結果如表1所示。 照射於前 束量的相 L6不會 射，對各 於相對向 ，能夠解 因此，在 ，能夠解 行之第2 施例1至 系統，除 相同的結 統，分別 的値不同 ，使放電 1 1 2的突 -23- 200825454The second focus position D of the mirror 12 is condensed at a position E near the light source 1. Therefore, in the optical system for a projection apparatus of the present invention, the vapor deposition surface of the color wheel 3 is disposed in the concentrated light L2. 'Position position E (i.e., the position of the light source 1 closer to the size corresponding to the angle ABC than the second focus position D of the ellipsoidal mirror 12), so that the convergence by the ellipsoidal mirror 12 The light ray L2' is incident on the color wheel 3 at the incident angle BEX, and the light L6 reflected by the color wheel 3 is condensed on the electrode in such a manner as to have a reflection angle FEX equal to the incident angle BEX. Center position A. As a result, in the optical system for a projection apparatus of the present invention, the light ray L 6 is not irradiated to any one of the projections U2C provided in the pair of electrodes 112, and the deformation of each of the projections 1 1 2C can be solved. . -19-200825454 As described above, the optical system projections Π 2C for the projection apparatus of the present invention continue to maintain the desired shape and discharge, so that the problem of flickering in the projection apparatus can be solved. <Experimental Example 1> Hereinafter, an experimental example for confirming the effects of the present invention will be described. According to the structure shown in Fig. 1, an optical system for use in an embodiment of the present invention is fabricated. In the optical system for a projection apparatus, the center position between the emitters is set to A, and the straight line drawn by the direction orthogonal to the central position axis X between the electrodes and the elliptical mirror are set to B, and the elliptical surface is reflected. The first focus of the mirror is C, the second focus of the mirror is D, and when the optical axis X and the color wheel are crossed to E, the straight line connecting A and B and the straight line connecting B and C are formed. An angle DBE between the angle AB C ( 0 1 ) and the two straight lines connecting the lines B and D connecting B and E ((substantially, the discharge lamp 1 1 , the elliptical mirror 1 2 , 〇 are arranged) The optical system for a projection apparatus of an embodiment has the following specifications; an elliptical mirror 12 having a first focal length of 8 · 1 mm and a distance of 64.1 mm. The discharge lamp 11 is mercury in a luminous tube of 16.16 mg/mm 3 , The distance between the electrodes is 1.0 mm. The explosion-proof thickness is 2.8 mm, and is placed at a position of 15.9 mm from the front side of the ellipsoidal mirror 12, and is arranged to be orthogonal to the optical axis X. The electric A of the projection charging lamp is set to the line connecting the two points of the intersection of the elliptical surface of the intersection with the optical fork and the color of 1 3) Wheel 3 The second focus 3 is packaged with the member 2 being 121. The line is inclined by -20 - 200825454 10°, intersecting the optical axis X. The color wheel 3 is separated by the front side opening 121 of the ellipsoidal mirror 12 The position of 26.6 mm is arranged such that the vapor deposition surface is orthogonal to the optical axis X on the light source side. The separation distance AC between the center position A between the electrodes of the discharge lamp 1 1 and the first focus position C of the elliptical mirror 丨 2 is 0.1. The separation distance DE between the intersection E of the optical axis X and the color wheel 3 and the second focus position D of the ellipsoidal mirror 12 is 1.3 mm. The optical system for the projection apparatus of the embodiment has an angle ABC (θ 1 ) of 0.3 96. , the angle DBE ( 03 ) is 〇 .304., the 値 of 0 1 is substantially the same as the 値 of 03, and the optical system for the projection apparatus of the comparative example of 3 types is produced, except for the above-mentioned angle DBE ( 0 3 ) The configuration and specifications of the optical system for the projection device of the above-described embodiment are the same as those of the optical system for the projection device of the first embodiment, and 0 3 is 0·0.5. The optical system for the projection device of Comparative Example 2 , 0 3 is 0.8 4 . That is, the optical system for the projection apparatus of Comparative Examples 1 to 3, which is with 0 1 In the optical system of the projection apparatus of the embodiment which substantially coincides with the 値 of 0 3 , the 値 of 0 1 and the 値 of 0 3 have a large difference. The optical system for the projection apparatus of the above embodiment and the optical systems of Comparative Examples 1 to 3 In the optical system for a projection device, a light receiving device that uses an optical fiber is disposed outside the discharge lamp to receive light reflected into the electrode, and the reflected light reflected by the color filters R, G, and B toward the discharge lamp 11 is disposed. In the case of L6, the electrode (the electrode on the front side) on the side of the front side opening 121 of the ellipsoidal mirror 12 and the electrode on the side of the rear side opening of the ellipsoidal mirror 1 2 (the rear side) are irradiated. The amount of the beam of the electrode was measured. The results are shown in Figure 21 of -21 - 200825454. Fig. 6 is a graph showing the relationship between the relative enthalpy of the amount of the beam irradiated to the electrode 1 1 2 and the angle D BE ( 0 3 ) when the total beam amount of the emitted light L 1 from the discharge lamp 11 is set to 1. In Fig. 6, the vertical axis shows the relative enthalpy of the amount of the beam irradiated to the electrode 12, and the horizontal axis shows the 角 of the angle DBE (0 3 ) (unit: ° (degrees)). In Fig. 6, the solid line shows the relative enthalpy of the amount of the beam irradiated to the electrode on the front side, and the broken line shows the relative enthalpy of the amount of the beam irradiated to the electrode on the rear side. As shown in Fig. 6, in the optical system for a projection apparatus of Comparative Example 1, the relative enthalpy of the amount of the beam irradiated to the electrode on the front side is 〇. 〇2 4, whereas the relative amount of the beam irradiated to the electrode on the rear side is relatively The threshold is 0.1 0 7. Further, in the optical system for a projection apparatus of Comparative Example 2, the relative enthalpy of the amount of the beam irradiated to the electrode on the front side is 〇·1 〇8, whereas the relative enthalpy of the amount of the beam irradiated to the electrode on the rear side is 0· 03 1. Further, the relative enthalpy of the amount of the beam irradiated to the electrode on the front side by the optical system for the projection apparatus of Comparative Example 3 is 11 to 60, whereas the relative enthalpy of the amount of the beam irradiated to the electrode on the rear side is 0·0. 1 3. As shown in the results of the experiment, when the optical system for the projection apparatus of Comparative Examples 1 to 3 having a large difference between 値 of 0 1 and 値 of 0 3 is used, either one of the electrode on the front side or the electrode on the rear side is irradiated. Since the reflected light L6 is large, there is a possibility that the projections provided on one of the opposing electrode main portions are melt-deformed, and the discharge arc formed between the electrodes of the discharge lamp cannot be resolved. Therefore, in the projection apparatus equipped with the optical system for a projection apparatus of Comparative Example 丨3, the problem of occurrence of flickering cannot be solved -22-200825454. On the other hand, in the optical system for a projection apparatus of the embodiment, the light beam amount of the electrode on the square side and the light intensity of the electrode irradiated on the rear side are both about 〇. As a result of the experiment, it is reflected that the amount of light irradiated to one of the electrode on the front side or the electrode on the rear side is equal, and therefore, there is no protrusion of any one of the electrode body portions provided. The melt deformation is determined by the instability of the discharge arc between the electrodes of the discharge lamp. The projection apparatus equipped with the optical system for a projection apparatus of the embodiment produces a problem of flicker. <Example 2> Hereinafter, an experimental example for confirming the effects of the present invention will be described. Each of the six types of optical systems for projection devices (real 6) was produced in a total of 60 (these optical devices have an optical angle DBE (0 3 ), and all of them have the same configuration and specifications as in the first embodiment). The optical systems for the projection apparatuses of Examples 1 to 6 are shown in Table 1 below, and the enthalpy of 0 1 is 〇. 3 9 6, but 0 3 is 0.05, 0.12, 0.30, 0.52, 0.57, and 0.84, respectively. In each of the projection apparatuses of Examples 1 to 6, after the optical system lamp 1 1 was turned on for a predetermined period of time, it was visually confirmed whether or not the electrode starting portion 1 1 2 C was melt-deformed. The results are shown in Table 1. The amount of the front beam amount was irradiated. The phase L6 does not emit, and it can be solved for each relative direction. Therefore, in the second embodiment 1 to the system that can be solved, except for the same system, the respective enthalpy is different, so that the discharge 1 1 2 -23 - 200825454
Θ [[deg] Θ 3 [deg] 0 3/01 電極熔融 實 施 例 1 0.396 0.05 0.13 X 實 施 例 2 0 • 396 0 .12 0.30 〇 實 施 例 3 0.396 0. .30 0.77 〇 實 施 例 4 0 • 396 0‘ .52 1.3 1 〇 實 施 例 5 0 • 396 0. ,57 1.44 X 實 施 例 6 0 • 396 0, .84 2.12 X 在表1，「〇」顯示突起部1 1 2 C未產生熔融變形， 「X」顯示突起部1 1 2C已產生熔融變形。如表i所示，0 3/θ 1的値爲上述數學式4的範圍內之實施例2至4的投影 裝置用光學系統，其設置於電極112的突起部U2C並未 產生熔融變形。而0 3 /θ 1的値爲數學式4的範圍以外之實 施例1、5、6的投影裝置用光學系統，其設置於電極i ! 2 的突起部1 1 2C產生熔融變形。由此實驗結果得知，在0 3/θ 1的値位於數學式4的範圍內之投影裝置用光學系統， 由於照射於一對電極112之前述反射光L6的光束量大致 相等，故，突起部1 12C未產生熔融變形。相對於此，在 Θ 3/Θ1的値處於數學式4的範圍外之投影裝置用光學系統 ，因照射於其中任一方的電極之前述反射光L6的光束量 偏移，所以，突起部1 1 2C產生了熔融變形。 再者，關於本發明的投影裝置用光學系統，不限於上 述結構，可進行適宜變更。例如，設於光源的反射鏡不限 於橢圓面反射鏡，亦可使用將來自於放電燈的放射光作爲 -24- 200825454 與反射鏡的光軸平行的光加以反射之拋物面反射鏡。當在 光源使用拋物面反射鏡之情況，藉由於由拋物面反射鏡所 射出的反射光行進光路上，配置透鏡等的光學構件，將由 拋物面反射鏡所射出的平行光聚光於光導件之光射入面。 【圖式簡單說明】 圖1是示意地顯示本發明的投影裝置用光學系統的結 構之圖。 圖2是示意地顯示圖1所示的投影裝置用光學系統中 ，放電燈的電極之結構的圖。 圖3是槪念性地顯示本發明的投影裝置用光學系統之 光源與色轉輪的位置關係之圖。 圖4是槪念性地顯示，在本發明的投影裝置用光學系 統，受到濾色器所反射的光朝光源行進之光路的圖。 圖5是槪念性地顯示獲得本發明的投影裝置用光學系 統之效果的理由之圖。 圖6是顯示爲了確認本發明的效果所進行之實驗結果 的圖。 圖7是示意地顯示以往的投影裝置結構之圖。 圖8是顯示圖7所示的投影裝置用光學系統所具備的 光轉輪之正面圖。 圖9是示意地顯示以往之搭載於投影裝置的投影裝置 用光學系統之結構，並且槪念性地顯示受到色轉輪所反射 的光行進之光路的圖。 -25- 200825454 圖1 0是針對以往的投影裝置用光學系統所具備之放 電燈與濾色器，顯示來自於放電燈的放射光的光譜、及濾 色器的光透過率與波長之關係的圖。 【主要元件符號說明】 1 :光源 1 1 :放電燈 111 :發光管 1 1 2 :電極 1 12Α :軸部 1 1 2 Β :電極本體部 1 1 2 C :突起部 1 12D ：線圈部 1 2 :橢圓面反射鏡 1 2 1 :前方側開口 122 :後方側開口 2 :防爆構件 3 :色轉輪 R :濾、色器 G :濾色器 Β :濾色器 4 :光導件 4 1 :光射入面 42 :光射出面 -26- 200825454 43 :側壁 5 :中繼透鏡 6 :中繼反射鏡 7 :反射型影像元件 8 :投射型圖像顯示裝置 A :放電燈的電極間之中心位置 B :由電極間的中心位置朝與光軸正交的方向所拉出之直 線與橢圓反射鏡交叉之交點 C :橢圓面反射鏡之第1焦點位置 D :橢圓面反射鏡之第2焦點位置 E:光軸與色轉輪交叉之交點 X :光軸 -27-Θ [[deg] Θ 3 [deg] 0 3/01 Electrode melting Example 1 0.396 0.05 0.13 X Example 2 0 • 396 0 .12 0.30 〇 Example 3 0.396 0. .30 0.77 〇 Example 4 0 • 396 0' .52 1.3 1 〇Example 5 0 • 396 0. , 57 1.44 X Example 6 0 • 396 0, .84 2.12 X In Table 1, “〇” shows that the protrusion 1 1 2 C has not melted, "X" indicates that the protrusions 1 1 2C have undergone melt deformation. As shown in Table i, the 値 of 0 3 / θ 1 is the optical system for the projection apparatus of Examples 2 to 4 in the range of the above Mathematical Formula 4, and the projection U2C provided on the electrode 112 is not melt-deformed. On the other hand, in the optical system for projection apparatuses of the first, fifth, and sixth embodiments, the 値 of 0 3 /θ 1 is outside the range of the mathematical expression 4, and the projections 1 1 2C provided on the electrode i ! 2 are melt-deformed. As a result of the experiment, it is found that the optical system for the projection device in which the 値 of 0 3 /θ 1 is within the range of the mathematical expression 4 is such that the amount of the light beam irradiated to the pair of electrodes 112 by the reflected light L6 is substantially equal. The portion 1 12C did not undergo melt deformation. On the other hand, in the optical system for a projection apparatus in which 値 3/Θ1 is outside the range of the mathematical expression 4, the amount of the light beam of the reflected light L6 irradiated to one of the electrodes is shifted, so that the projection 1 1 2C produced melt deformation. Further, the optical system for a projection apparatus according to the present invention is not limited to the above configuration, and can be appropriately changed. For example, the mirror provided on the light source is not limited to the elliptical mirror, and a parabolic mirror that reflects the light from the discharge lamp as a light parallel to the optical axis of the mirror may be used. When a parabolic mirror is used as the light source, the reflected light emitted by the parabolic mirror travels on the optical path, and an optical member such as a lens is disposed, and the parallel light emitted by the parabolic mirror is condensed into the light guide. surface. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view schematically showing the configuration of an optical system for a projection apparatus of the present invention. Fig. 2 is a view schematically showing the configuration of an electrode of a discharge lamp in the optical system for a projection apparatus shown in Fig. 1; Fig. 3 is a view showing the positional relationship between the light source and the color wheel of the optical system for a projection apparatus of the present invention. Fig. 4 is a view schematically showing an optical path through which the light reflected by the color filter travels toward the light source in the optical system for a projection apparatus of the present invention. Fig. 5 is a view schematically showing the reason why the optical system for a projection apparatus of the present invention is obtained. Fig. 6 is a view showing the results of experiments conducted to confirm the effects of the present invention. Fig. 7 is a view schematically showing the configuration of a conventional projection apparatus. Fig. 8 is a front elevational view showing a light wheel provided in the optical system for a projection apparatus shown in Fig. 7; Fig. 9 is a view schematically showing the configuration of an optical system for a projection apparatus mounted on a projection apparatus in the related art, and fascinatingly showing an optical path through which light reflected by the color wheel travels. -25- 200825454 FIG. 10 is a discharge lamp and a color filter provided in the conventional optical system for a projection device, and displays a spectrum of the emitted light from the discharge lamp and a relationship between the light transmittance of the color filter and the wavelength. Figure. [Description of main component symbols] 1 : Light source 1 1 : Discharge lamp 111 : Light-emitting tube 1 1 2 : Electrode 1 12 Α : Shaft portion 1 1 2 Β : Electrode body portion 1 1 2 C : Projection portion 1 12D : Coil portion 1 2 : Elliptical mirror 1 2 1 : Front side opening 122 : Rear side opening 2 : Explosion-proof member 3 : Color wheel R : Filter, color G : Color filter Β : Color filter 4 : Light guide 4 1 : Light Injection surface 42: Light exit surface -26- 200825454 43 : Side wall 5 : Relay lens 6 : Relay mirror 7 : Reflective image element 8 : Projection type image display device A : Center position between electrodes of discharge lamp B: the intersection of the straight line drawn from the center position of the electrodes in the direction orthogonal to the optical axis and the elliptical mirror C: the first focus position of the elliptical mirror D: the second focus position of the elliptical mirror E: intersection of the optical axis and the color wheel X: optical axis -27-