201241544 六、發明說明： 【發明所屬之技術領域】 本發明係關於作爲投射顯示裝置（投影機）等的光源 使用之光源裝置。 【先前技術】 從前，作爲投影機用的光源，多使用超高壓水銀燈、 氙燈及鹵素燈等放電燈。由替代這樣的放電燈，改採低耗 電量、瞬間點亮、長壽命、高色純度及無水銀等理由而提 議使用半導體光源。半導體光源之中的發光二極體（led )，近年來急速普及，使家庭用燈泡由從前的白熾燈替換 發展至LED。另一方面，作爲投影機用的光源，仍停留在 採用作爲一部分低亮度投影機用的光源的狀況。其理由， 是因爲LED爲面發光光源，要高亮度化必須要增大投入 電力以及面積雙方。換句話說，每單位面積的光束量，在 實際上作爲投影機的光源使用時仍無法得到可替代從前的 放電燈之充分的亮度。 在此，被提出了不足的LED之光學利用效率的高效 率化（例如，參照專利文獻1 )。 〔先前技術文獻〕 〔專利文獻〕 〔專利文獻1〕日本特開2008 -268 5 3號公報 201241544 【發明內容】 本發明之目的在於提供增大發光部的每單位面積之光 束量，使光束能夠以高效率輸出之光源裝置。 〔供解決課題之手段〕 根據本發明之一態樣，提供一種光源裝置，具備：發 出一次光的第1固體發光元件（2、2a、31a)，吸收前述 一次光而發出二次光的第1螢光體膜（3、3a)，具有： 與第1螢光體膜（3、3a)具間隙而被配置的射入面（11 )、與射入面（1 1 )傾斜而對向的傾斜面（1 2 )、以及射 出由射入面（1 1 )射入的.光之射出面（13 )的稜鏡（1 ) ，以及被配置於第1固體發光元件（2、2a、31a)與第1 螢光體膜（3、3a)之間，透過一次光且反射二次光的第1 二次光反射膜（4、4a)。 於本發明之一態樣，亦可進而具有在射入面（1 1 )與 第1螢光體膜（3)不對向的部分具間隙而設置的金屬膜 鏡（7 )。 '於本發明之一態樣’亦可於從對向於射出面（1 3 )的 夾角面（14)往射出面（13)的方向’射入面（11)的長 度及第1二次光反射膜（4)的長度（D1+D2) ’比第1 螢光體膜（3)的長度（D1)更長’第1螢光體膜（3)被 配置成與射入面（11)之夾角面（I4)側的—部分相對向 〇 於本發明之一態樣’亦可進而具備於傾斜面（1 2 )具 -6- 201241544 間隙而配置的’透過一次光且反射二次光之第2二次光反 射膜（5 )。此外，亦可進而具備於傾斜面（1 2 )具間隙 而被配置的’反射一次光及二次光之金屬膜鏡。 於本發明之一態樣，亦可進而具備：於傾斜面（1 2 ) 具間隙而配置的，吸收一次光而發出二次光之第2螢光體 膜（3b )，及發出供照明第2螢光體膜（3b)之用的一次 光的第2固體發光元件（4b)，及被配置於第2螢光體膜 (3b)與第2固體發光元件（4b)之間，透過一次光且反 射二次光之第2二次光反射膜（4b)。 於本發明之一態樣，亦可進而具備以包圍第1固體發 光元件（2)與第.1螢光體膜（3)之間的方式配置的，具 有反射一次光及二次光的內壁面之燈管（8)。 於本發明之一態樣，燈管（8 )亦可具有由第1固體 發光元件（2 )側朝向第1螢光體膜（3 )側擴開的錐狀形 狀。 於本發明之一態樣，亦可進而具備：被配置於射出面 (13)，反射一次光且透過二次光的一次光反射膜（6) 〇 於本發明之一態樣，亦可以是第1固體發光元件（ 31b)發出具有單一波長的一次光，而第1二次光反射膜 (4a)的分光特性爲窄帶域。 〔發明之效果〕 根據本發明，可以提供增大發光部的每單位面積之光 201241544 束量’使光束能夠以高效率輸出之光源裝置。 【實施方式】 其次，參照圖面說明本發明之第1〜第3實施型態。 於以下之圖面的記載，對於相同或類似部分賦予同一或類 似的符號。但是圖面僅係模式顯示而已，與其厚度或平面 尺寸之關係、各層的厚度比率等都與現實中有所不同，應 特別留意。亦即，具體的厚度或尺寸因該參酌以下的說明 再判斷決定。又，於圖面相互間當然也包含相互尺寸關係 或者比率有所不同的部分。 此外，以下所示之第1〜第3實施型態，係使本發明 之技術思想具體化而例示之裝置或方法，本發明之技術思 想’並不是使構成零件之材質、形狀、構造、配置等被限 定爲以下所示之例。本發明之技術思想，在申請專利範圍 所記載之範圍內，可以加以種種變更。 (第1實施型態） 相關於本發明的第1實施型態之光源裝置，如圖1所 示，具備：發出一次光（一次光源光）的固體發光元件2 ，吸收一次光而發出二次光（二次光源光）的螢光體膜3 ，具有與登光體膜3中介著空氣而被配置的楔形狀的棱鏡 1，以及被配置於固體發光元件2與螢光體膜3之間，透 過藉由固體發光元件2發光的一次光且反射藉由螢光體膜 3發光的二次光的第1二次光反射膜4。 -8- 201241544 作爲稜鏡1的材料，可以使用折射率比1大的玻璃或 樹脂。稜鏡1的各面爲表面粗糙度小的硏磨面。稜鏡1， 除了硏磨加工或切削加工以外還可以藉由模具成形而製作 〇 稜鏡1，如圖1及圖2所示，具有：沿著螢光體膜3 中介著空氣而被配置的面（以下稱爲「射入面」）11、與 射入面1 1傾斜而對向的面（以下稱爲「傾斜面」）12 ' 垂直於射入面11及傾斜面12相互平行對向的2個面（以 下稱爲「垂直面」）15、16、在射入面11及傾斜面12之 間隔逐漸變寬一側，與射入面1 1、傾斜面1 2及2個垂直 面15、16連接，具有比螢光體膜3的面積更小的面積之 面（以下稱爲「射出面」）1 3、以及與射出面13平行對 向的面（以下稱爲「夾角面」）14。 做爲顯示輿圖1之固體發光元件2，可以使用LED或 半導體雷射等種種發光元件。固體發光元件2的背面側被 形成反射膜，由發光層發光的1次光直接或者以反射膜反 射而往表面側射出。固體發光元件2，例如具有俯視2mm X6mm程度之矩形。於本發明之第1實施型態，作爲固體 發光元件2使用藍色LED。固體發光元件2’藉由具有反 射1次光的反射面之支撐構件2 1所支撐。 螢光體膜3，以與射入面1 1的夾角面1 4側的一部份 對向的方式，藉由在玻璃等基板23上塗布而形成的。螢 光體膜3的俯視之形狀與固體發光元件2約略相同’螢光 體膜3的面積與固體發光元件2的面積爲相同。作爲螢光 -9 - 201241544 體膜3的材料，可以採用硫化物系、氧化物系或氮化物系 等種種螢光體。螢光體膜3，作爲二次光源而作用，把藉 由固體發光元件2發光之一次光作爲激發光而吸收，發出 與一次光不同波長的二次光。螢光體膜3,例如在一次光 爲藍色光的場合，發出綠色或紅色等之紫外〜可見光。由 夾角面14朝向射出面13在平行於射入面11的方向，基 板23的長度（D1+D2 )，比螢光體膜3的長度D1更長， 進而射入面11的長度比基板23的長度（D1+D2)更長》 第1二次光反射膜4,在基板23之與螢光體膜3被配置的 面對向的面上，以與螢光體膜3具有約略相同的面積的方 式被配置。作爲第1二次光反射膜4，可以使用例如使由 折射率不同的氧化矽（Si02 )與氧化鈦（Ti02 )所構成的 薄膜交互層積之二色膜等。第1二次光反射膜4，可以在 基板23上藉由蒸鍍法形成。 進而，在基板23上之第1二次光反射膜4未被配置 的部分，配置著使可見光全部以高反射率（例如98%以上 )反射的銀鏡等金屬膜鏡7。金屬膜鏡7，係以不與射入 面11之射出面13側的螢光體膜3對向的部分中介著空氣 而對向的方式被配置。 進而，沿著傾斜面1 2中介著空氣被配置著第2二次 光反射膜5。第2二次光反射膜5，被配置於玻璃等之基 板24上。由夾角面14朝向射出面13平行於傾斜面12的 方向上，第2二次光反射膜5及基板24的長度D3，與基 板23的長度（D1+D2 )約略相同。第2二次光反射膜5， -10- 201241544 透過一次光且反射二次光。作爲第2二次光反射膜5，可 以使用例如使由折射率不同的氧化矽（Si02 )與氧化鈦（ Ti02)所構成的薄膜交互層積之二色膜等。第2二次光反 射膜5’可以在基板24上藉由蒸鍍法形成。 進而，於射出面13上被配置著一次光反射膜6。一次 光反射膜6，反射一次光且透過二次光。作爲一次光反射 膜6，可以使用例如使由折射率不同的氧化矽（s i Ο 2 )與 氧化鈦（Ti02 )所構成的薄膜交互層積之二色膜等。一次 光反射膜6’可以於射出面13上藉由蒸鍍法等來形成。 進而，以包圍固體發光元件2與螢光體膜3之間的方 式被配置四角柱之筒（燈管）.8。燈管8，具有以反射一次 光及二次光之鏡所形成的內壁面。燈管8的外側，以包圍 燈管8的方式被配置著覆蓋構件2 2。 其次，使用圖3〜圖6說明使用相關於本發明之第1 實施型態的光源裝置的照明方法（光線輸出的原理）。又 ，於圖3〜圖6以虛線箭頭顯示一次光，以實線箭頭顯示 二次光。 如圖3所示，由固體發光元件2發光的一次光（藍色 光），通過燈管8透過第1二次光反射膜4及基板2 3，照 明螢光體膜3。如圖3及圖4所示，螢光體膜3吸收一次 光作爲激發光，發出二次光（綠色光）。此時，螢光體膜 3中的各螢光體粒子之各個分別吸收一次光，將二次光往 全方位（360度）發出。因此一次光之中約一半的光往棱 鏡1側發光。另一方面，剩下的光往其相反側發光，但在 -11 - 201241544 第1二次光反射膜4反射，全部的二次光朝向 此外’一次光之中的一部分不被螢光體膜3吸 光體膜3。 如圖5所示，在螢光體膜3發光之二次光 光體膜3的一部份一次光，中介著空氣射入稜 面丨1，在稜鏡1內多重反射》稜鏡1的各面被 所以由折射率高的稜鏡1往折射率低的系外， 法則的角度以上的光線，全部超過臨界角而在: 起內部反射。亦即，在2個垂直面15、16及; 由螢光體膜3射入的所有的一次光及二次光進 〇 另一方面，在射入面11及傾斜面12，射 一部份的光線未超過臨界角，所以往稜鏡1系 出的光線，以第1二次光反射膜4、第2二次 及金屬膜鏡7反射而再度回到稜鏡1»稜鏡1 出面1 3側擴開的楔形狀，所以未超過臨界角 反覆進行多重反射而超過臨界角，進行內部反 體膜3輸出的光線超過臨界角而反覆進行多重 ，對圖1所示的螢光體膜3的長度D1，使稜丨 面11、射出面12及2個垂直面15、16增長， 鏡7的長度D2及第2二次光反射膜5的長度 的長度。如此進行，藉由在稜鏡1內反覆進行 由射出面1 3以高效率使光線往系外射出。 此外，如圖6所示，二次光由射入面11 稜鏡1側。 收而透過螢 ，與透過螢 鏡1的射入 鏡面硏磨， 滿足斯涅耳 陵鏡1內引 夾角面1 4， 行內部反射 入稜鏡1時 外射出。射 光反射膜5 ，具有在射 的光線，也 射。由螢光 反射的方式 鏡1的射入 且使金屬膜 D3爲適宜 多重反射而 往稜鏡外射 -12- 201241544 出，在射入第1二次光反射膜4時，玻璃與空氣的 差比玻璃與螢光體膜3的折射率還要大，所以射入 次光反射膜4的二次光的射入角變小。因此，二次 膜4可以高的機率反射二次光。 如以上所說明的，根據相關於本發明的第1實 的光源裝置，發出二次光的螢光體膜3的面積，比 次光的射出面13的面積還要大，所以改善光 etendue)，能夠以高亮度進行照明。接著，藉由以 體發光元件2的一次光使螢光體膜3發出二次光， 光以第1二次光反射膜4反射，能夠以射入面1 1 面1 2彼此使二次光分別反覆進行多重反射，而由 13有效率地輸出二次光。因而，可以使單位面積之 增大，能夠以高效率輸出光束。 於圖7顯示針對螢光體膜3的面積與亮度的關 模擬的結果。隨著螢光體膜3的面積，以及稜鏡1 面1 1及傾斜面1 2所夾的楔的角度而細節有所不同 由作爲比較例的L E D所發出的光直接射入稜鏡， 行多重反射使其射出的構成，相關於本發明的第1 態之光源裝置有變成接近2倍亮的可能性。特別是 增大螢光體膜3的面積有其效果，超過了從前認爲 增大LED也沒有效果的界線，所以可期待高亮度化 進而，根據相關於本發明的第1實施型態之光 的話’藉由配置第2二次光反射膜5，可以使由傾! 射出的二次光回到稜鏡1內。 折射率 第1二 光反射 施型態 射出二 展量（ 來自固 使二次 及傾斜 射出面 光束量 係進行 的射入 ，但使 反覆進 實施型 ，藉由 的即使 〇 源裝置 科面12 -13- 201241544 然而，一次光及二次光，具有如圖8所示的分光特性 。在由螢光體膜3射入至稜鏡1的光線，如前所述除了二 次光以外還混入一部分一次光。這是因爲關於螢光體膜3 的發光效率者，是未在螢光體膜3被吸收而直接透過的成 分。此成分混在射入光時，無法得到所要的頻譜使純色變 差。如圖9所示，第1二次光反射膜4、第2二次光反射 膜5及一次光反射膜6，再分別的帶域爲98%以上的高反 射。亦即，藉由配置第2二次光反射膜5，可以使未超過 臨界角的光線之藍光成分，透過第2二次光反射膜5而往 系外排出。 進而，根據相關於本發明的第1實施型態之光源裝置 的話，藉由於射出面13配置一次光反射膜6，可以使未被 螢光體膜3吸收而透過的一次光不由射出面13輸出而回 到稜鏡1內。藉由此一次光再度激發螢光體膜3使其發光 ，進而增大二次光，可以增大每單位面積的光束量。 進而，由於被配置於固體發光元件2的表面之電極， 及對電極供給電力之用的引線接合之封閉電路之物理因素 ，使固體發光元件2與稜鏡1隔開配置。根據相關於本發 明的第1實施型態之光源裝置的話，因爲具有燈管8，可 以防止固體發光元件2與稜鏡1之間隙發生光束的漏光。 (變形例） 作爲本發明的第1實施型態之變形例，如圖1 0所示 ’第1二次光反射膜4被配置於基板23與螢光體膜3之 -14- 201241544 間亦可。進而，第1二次光反射膜4，覆蓋基板23 亦可。第1二次光反射膜4的長度（D1+D2 )比螢 3的長度D1更長。 在本發明的第1實施型態之變形例，如圖1 1 螢光體膜3於基板23側發光之二次光被正下方的 次光反射膜4反射，所有的二次光朝向稜鏡1側。 由稜鏡1內透過射入面11射出的二次光藉由第1 反射膜4反射而回到稜鏡1內。 (第2實施型態） 在本發明的第1實施型態，說明了.具有固體發 2及螢光體膜3之1組光源的場合，在本發明的第 型態，說明具有2組光源的場合。 相關於本發明之第2實施型態之光源裝置，多 所示，具備：於稜鏡1的射入面1 1側，沿著射入S 中介著空氣配置的，吸收一次光而發出二次光之第 體膜3a，及發出供照明第1螢光體膜3a之用的一 第1固體發光元件2a，及被配置於第1螢光體膜： 1固體發光元件2a之間，透過一次光且反射二次光 二次光反射膜4a。 第1固體發光元件2a藉由支撐構件21a支撐 固體發光元件2a及第1螢光體膜3a之間，被配置: 及覆蓋構件22a。 第1螢光體膜3a及第1二次光反射膜4a被配 的全面 光體膜 所示， 第1二 此外， 二次光 光元件 2實施 ]圖 12 i η而 1螢光 次光的 la與第 之第1 。第1 登管8a 置於基 -15- 201241544 板23a。在基板23a之未被配置第1螢光體膜3a的部分， 配置著使可見光全部以高反射率（例如98%以上）反射的 銀鏡等金屬膜鏡7a。 進而，相關於本發明之第2實施型態之光源裝置，具 備：於稜鏡1的射入面12側，沿著傾斜面1 2而中介著空 氣配置的，吸收一次光而發出二次光之第2螢光體膜3b， 及發出供照明第2螢光體膜3b之用的一次光的第2固體 發光元件2b，及被配置於第2螢光體膜3b與第2固體發 光元件2b之間，透過一次光且反射二次光之第2二次光 反射膜4b。 第2固體發光元件2b藉由支撐構件21b支撐。.第2 固體發光元件2b及第2螢光體膜3b之間，被配置燈管8b 及覆蓋構件22b。 第2螢光體膜3b及第2二次光反射膜4b被配置於基 板23b。在基板23b之未被配置第2螢光體膜3b的部分， 配置著使可見光全部以高反射率（例如98%以上）反射的. 銀鏡等金屬膜鏡7b。 其他構成，與本發明之第1實施型態實質相同，所以 省略重複的說明。 其次，使用圖12說明使用相關於本發明之第2實施 型態之光源裝置的照明方法之一例。 第1固體發光元件2a發出之一次光，透過燈管8a照 明第1二次光反射膜4 a，透過基板2 3 a照明第1螢光體膜 3a。第1螢光體膜3a吸收一次光發出二次光。另一方面 -16- 201241544 ，第2固體發光元件2b發出之一次光，透過燈管8b照明 第2二次光反射膜4b，透過基板23b照明第2螢光體膜 3b。第2螢光體膜3b吸收一次光發出二次光。 分別來自第I螢光體膜3a及第2螢光體膜3b的二次 光，與以第1二次光反射膜4a及第2二次光反射膜4b反 射的二次光及一次光的殘光成分一起透過空氣射入稜鏡1 ，在稜鏡1內及稜鏡1附近的第1二次光反射膜4a、第2 二次光反射膜4b、金屬膜鏡7a、7b反覆多重反射，而由 射出面1 3輸出。 此時，在第1螢光體膜3a及第2螢光體膜3b發出之 一部分二次光，分別射入相對之面的第1螢光體膜3 a及 第2螢光體膜3b。第1螢光體膜3a及第2螢光體膜3b， 對於一次光呈現吸收特性，但對於二次光不具有吸收特性 ，所以二次光分別透過第1螢光體膜3a及第2螢光體膜 3b或者一部分散射，藉由第1二次光反射膜4a及第2二 次光反射膜4b反射，再度透過第1螢光體膜3a及第2螢 光體膜3b而再射入稜鏡1。另一方面，一次光的殘留成分 之一部份也同樣射入相對之面的第1螢光體膜3a及第2 螢光體膜3b，但是第1螢光體膜3a及第2螢光體膜3b會 吸收而對二次光的發光有所貢獻。 此外，一部分的一次光，於射出面1 3以一次光反射 膜6反射而再度回到系內。關於一次光呈現完全被封閉之 系’所以再度反覆多重反射，而再度射入第1螢光體膜3a 及第2螢光體膜3b而被吸收對發光有所貢獻。再度透過 -17- 201241544 第1螢光體膜3a及第2螢光體膜3b的一次光，透過第1 二次光反射膜4a及第2二次光反射膜4b與基板23a、23b ，中介著燈管8a、8b回到第1固體發光元件2a及第2固 體發光元件2b。此光線，以第1固體發光元件2a及第2 固體發光元件2b自身反射，而再度照明第1螢光體膜3a 及第2螢光體膜3b。如此般也包含殘留成分，所有的一次 光在第1螢光體膜3a及第2螢光體膜3b被吸收而對二次 光的發光有所貢獻。 如以上所說明的，根據相關於本發明的第2實施型態 之光源裝置的話，於合成複數光源之類的系，也可以增大 每單位面積之光束量，而且能以高效率進行照明。 (第3實施型態） 相關於本發明的第3實施型態之光源裝置，如圖！ 3 所示’燈管8具有由固體發光元件2側朝向螢光體膜3側 擴展成錐形狀這一點，與本發明之第1實施型態不同。螢 光體膜3及第1二次光反射膜4的面積，比固體發光元件 2的面積更大。其他構成，與本發明之第1實施型態實質 相同，所以省略重複的說明。 其次，使用圖14與圖15說明使用相關於本發明的實 施型態之光源裝置的照明方法之一例。 如圖14所示’由固體發光元件2發出的一次光，對 固體發光元件2之表面的法線方向具有角度0〇，在燈管8 內多重反射同時朝向射出面1 3 »此時，在燈管8內的反射 -18- 201241544 面爲傾斜，所以每次一次光進行反射，朝向螢光體膜3的 角度β 0，0 1，0 2會變小。亦即，由燈管8射出的一次 光均成爲約略平行光。射出燈管8的1次光透過基板23, 透過第1二次光反射膜4而照明螢光體膜3。 此處，如圖15所示，構成第1二次光反射膜4的分 光鏡的角度特性，是射入的光線的角度變大時，分光反射 特性偏移往短波長側。因此，即使是一次光也無法透過光 線角度大的成分，發生無法以一次光充分照明螢光體膜3 的現象，而有無法得到所要的高亮度化的情形。對此，根 據本發明的第3實施型態的話，藉由燈管8具有錐形狀， 可以使一次光成約略平行光，所以不會因第1二次光反射 膜4的角度特性而被反射，可以高效率照明螢光體膜3。 接著，被照明的螢光體膜3,吸收一次光而發出二次 光（綠色光）。此時，螢光體膜3內部的各螢光體粒子之 各個分別吸收藍色光，將綠色光往全方位（ 360度）發出 。因此一次光之約一半的光往稜鏡1側發光，但剩下的光 往其相反的基板2 3側發光。本次帶有相當角度的光線射 入第1二次光反射膜4，但是藉由第1二次光反射膜4的 角度特性，因二次光的反射帶域很廣，所以可反射約略所 有的光，朝向稜鏡1側。接著，如圖16所示，藉由螢光 體膜3發出的二次光藉由稜鏡1、第1二次光反射膜4、 第2二次光反射膜5及金屬膜鏡7而反覆多重反射，由射 出面13射出。此時，藉由燈管8具有錐形狀，與燈管8 之直徑爲一定的場合相比，使得再射入燈管8的光線容易 -19- 201241544 回到稜鏡1。 如以上所說明的，根據相關於本發明的第3實施型態 的光源裝置，藉由具備錐形狀的燈管8,能夠以高效率照 明螢光體膜3，藉由螢光體膜3發光的高亮度化，可以使 射出的光束的每單位面積的光束量增大。進而，在稜鏡1 內多重反射，再度回到螢光體膜3的一次光以大於特定的 射入角射入的場合，可以不透過第1二次光反射膜4，而 再度回到螢光體膜3。因而，能夠使一次光以高效率照明 螢光體膜3。 (第1變形例） 作爲本發明的第3實施型態之第1變形例，如圖17 所示，具有2組光源，而燈管8a、8b分別由第1固體發 光元件2a及第2固體發光元件2b朝向第1螢光體膜3a 及第2螢光體膜3b具有錐形狀亦可。其他構成，與圖12 所示之相關於本發明之第2實施型態的光源裝置實質相同 ，所以省略重複的說明。 (第2變形例） 作爲本發明的第3實施型態之第2變形例，如圖18 所示，替代LED，使用輸出單一波長的雷射31a、31b亦 可。雷射3 1 a、3 1 b被配置於系外。於圖1 8顯示分別使用 複數個雷射31a、31b之雷射陣列，但是雷射31a、31b分 別使用1個亦可，個數沒有特別限定。雷射3 1 a、3 1 b如 -20- 201241544 圖19所示發出單一波長的藍色雷射光。由雷射31a、31b 輸出的光線成放射狀發光，以平行透鏡32a、32b使成爲 平行光。其後，複數平行光藉由共通的聚光透鏡33a、33b 射入燈管8a ' 8b的端面。在燈管8a、8b內多重反射的光 線，作爲約略平行光分別照明第1螢光體膜3 a及第2螢 光體膜3b。其他構成，與圖17所示之構成實質相同，所 以省略重複的說明。 如圖1 9所示的藍色雷射那樣輸出單一波長的場合， 作爲第1二次光反射膜4a及第2二次光反射膜4b，如圖 2 0所示，藉由使用照明螢光體膜3的約略平行光可透過， 而反射在稜鏡1內多重反射而回來的返回光之帶域狹窄的 反射膜，可以使一次光被閉入系內，使所有的一次光對於 在螢光體膜3的發光有所貢獻。 (其他實施型態） 如前所述，本發明記載了第1〜第3實施型態，但是 構成此揭示的一部份之論述以及圖面不應理解爲限定此發 明之範圍。由此揭示，熟悉該項技藝者明顯可以推知種種 替代實施型態、實施例以及相關運用技術。 例如，替代圖1所示的第2二次光反射膜5而具備使 可見光全部以高反射率（例如9 8 %以上）反射的銀鏡等金 屬膜鏡亦可。藉由配置金屬膜鏡，可以使不在螢光體膜3 被吸收而透過的一次光回到稜鏡1內，再度激發螢光體膜 3使其發光，進而增大二次光，增大每單位面積的光束量 -21 - 201241544 此外，於本發明之第1〜第3實施型態，針對楔形狀 的稜鏡1加以說明，但替代稜鏡1，使用如圖21所示被塡 充空氣的楔形狀的筐體IX亦可。在此場合，於筐體lx的 內壁面形成反射一次光及二次光的金屬膜鏡或者反射二次 光的二次光反射膜。進而，設置供射入來自螢光體膜3的 二次光之用的開口部1 7，與比射出二次光之用的開口部 17的面積更大的開口部18亦可》 此外，相關於本發明的第1〜第3實施型態的稜鏡1 ，採用與射出面13相比，射入面11及傾斜面12顯著更 大的構成亦可。此外，與稜鏡1的射出面13比較，使螢 光體膜3的面積顯著更大的構成亦可。此外，沒有稜鏡i 的夾角面1 4 ’而射入面1 1及傾斜面1 2爲連續的楔形狀的 場合也可以適用。此外，垂直面15、16，垂直於射入面 1 1及傾斜面1 2且相互平行者爲較佳，不是嚴密的垂直及 平行亦可。進而，設出面13及夾角面14，以相互爲平行 較佳，不是嚴密的平行亦可。 此外’於本發明的第1〜第3實施型態，說明了作爲 一次光發藍色光，作爲二次光發綠色光的場合，但作爲以 一次光之藍色光激發之二次光發出如圖8所示的波長帶域 的紅色光亦爲可能。進而，以波長短（能量大的）紫外光 作爲激發光’而發出可見光域的所要頻譜亦可。在此場合 ，作爲二次光反射膜4、5、4a、4b，可以適當選擇反射及 透過分別的帶域的頻譜之膜。 -22- 201241544 此外，相關於本發明的第1〜第3實施型態的光源裝 置，亦可適用於具有調變由光源裝置射出的二次光的空間 光調變元件，及使被調變的二次光之影像成像而顯示於螢 幕等之成像光學系的影像顯示裝置。 如此般，本發明不以前述記載爲限，當然亦包含申請 專利範圍內之種種實施型態。亦即，本發明之技術範圍係 依照從前述之說明來看屬於妥適的申請專利範圍之發明特 定事項來決定的。 本光源裝置，可以作爲投影機的光源來利用》 【圖式簡單說明】 圖1係顯示相關於本發明之第1實施型態之光源裝置 之一例之剖面圖。 圖2係顯示相關於本發明之第1實施型態之稜鏡之一 例之立體圖。 圖3係供說明相關於本發明的第1實施型態之照明方 法之槪略圖。 圖4係供說明相關於本發明的第1實施型態之照明方 法之其他槪略圖。 圖5係供說明相關於本發明的第1實施型態之照明方 法之其他槪略圖。 圖6係供說明相關於本發明的第1實施型態之照明方 法之其他槪略圖。 圖7係顯示相關於本發明之第1實施型態及比較例之 -23- 201241544 發光部面積與亮度之關係的模擬結果之圖。 圖8係顯示相關於本發明之第1實施型態之一次光及 二次光的分光分布之圖。 圖9係顯示相關於本發明之第1實施型態之一次光反 射膜與二次光反射膜的分光特性之圖。 圖1 0係顯示相關於本發明之第1實施型態之變形例 之光源裝置之一例之剖面圖。 圖1 1係供說明相關於本發明的第1實施型態的變形 例之照明方法之槪略圖。 圖12係顯示相關於本發明之第2實施型態之光源裝 置之一例之剖面圖。 圖13係顯示相關於本發明之第3實施型態之光源裝 置之一例之剖面圖。 圖1 4係供說明相關於本發明的第3實施型態之照明 方法之槪略圖。 圖15係顯示相關於本發明的第3實施型態之二次光 反射膜的角度特性之圖。 圖1 6係供說明相關於本發明的第3實施型態之照明 方法之其他槪略圖。 圖1 7係顯示相關於本發明之第3實施型態的第1變 形例之光源裝置之一例之剖面圖。 圖1 8係顯示相關於本發明之第3實施型態的第2變 形例之光源裝置之一例之剖面圖。 圖19係顯示相關於本發明之第3實施型態的第2變 -24- 201241544 形例之一次光及二次光的分光分布之圖。 圖20係顯示相關於本發明的第3實施型態的第2變 形例之二次光反射膜的角度特性之圖。 圖2 1係顯示相關於本發明的其他實施型態之筐體之 —例之立體圖。 【主要元件符號說明】 1 :稜鏡 lx :筐體 2、 2a、2b :固體發光元件 3、 3a、3b :螢光體膜 4、 4a、4b、5 :二次光反射膜 6 : —次光反射膜 7、 7a ' 7b :金屬膜鏡 8、 8 a、8 b :燈管 1 1 :射入面 1 2 :傾斜面 1 3 :射出面 1 4 :夾角面 15、16 :垂直面 1 7、1 8 :開口部 2 1、2 1 a、2 1 b :支撐構件 22 、 22a 、 22b :覆蓋構件 23、 23a、 23b、 24:基板 -25- 201241544 31a、31b:雷射 32a、32b:平行透鏡 3 3 a、3 3 b :聚光透鏡 -26-201241544 6. OBJECT OF THE INVENTION: TECHNICAL FIELD The present invention relates to a light source device used as a light source such as a projection display device (projector). [Prior Art] In the past, as a light source for a projector, a discharge lamp such as an ultrahigh pressure mercury lamp, a xenon lamp, and a halogen lamp was often used. In place of such a discharge lamp, it is recommended to use a semiconductor light source for reasons such as low power consumption, instantaneous lighting, long life, high color purity, and mercury-free. Light-emitting diodes (LEDs) among semiconductor light sources have rapidly spread in recent years, and domestic light bulbs have been replaced by former incandescent lamps to LEDs. On the other hand, as a light source for a projector, it is still in a state in which a light source for a part of a low-brightness projector is used. The reason is that the LED is a surface-emitting light source, and it is necessary to increase both the input power and the area in order to increase the brightness. In other words, the amount of light per unit area does not provide sufficient brightness to replace the previous discharge lamp when actually used as a light source for a projector. Here, the efficiency of the optical use efficiency of the insufficient LED has been increased (for example, refer to Patent Document 1). [Prior Art] [Patent Document 1] [Patent Document 1] JP-A-2008-268 5 No. 201241544 SUMMARY OF THE INVENTION An object of the present invention is to provide an increase in the amount of light per unit area of a light-emitting portion, thereby enabling a light beam to be used. A light source device that outputs at high efficiency. [Means for Solving the Problem] According to an aspect of the present invention, a light source device includes: a first solid-state light-emitting element (2, 2a, 31a) that emits primary light, and a second light that absorbs the primary light and emits secondary light The phosphor film (3, 3a) has an entrance surface (11) which is disposed in a gap with the first phosphor film (3, 3a) and which is inclined with respect to the incident surface (1 1 ) The inclined surface (1 2 ) and the 稜鏡(1) that emits the light exit surface (13) incident on the incident surface (11), and the first solid-state light-emitting element (2, 2a, 31a) A first secondary light reflecting film (4, 4a) that transmits primary light and reflects secondary light with the first phosphor film (3, 3a). Further, in one aspect of the invention, a metal film mirror (7) provided with a gap between the incident surface (1 1 ) and the first phosphor film (3) may be provided. 'In one aspect of the present invention', the length of the incident surface (11) from the angled surface (14) opposite to the exit surface (13) to the exit surface (13) and the first time The length (D1+D2) of the light-reflecting film (4) is longer than the length (D1) of the first phosphor film (3). The first phosphor film (3) is disposed to be in contact with the incident surface (11). The portion on the side of the angled surface (I4) is opposite to the one in the aspect of the present invention, and can be further configured to have a light passing through the primary surface of the inclined surface (1 2 ) with a gap of -6-201241544. The second secondary light reflecting film (5) of light. Further, a metal film mirror that reflects the primary light and the secondary light, which is disposed on the inclined surface (1 2 ) with a gap, may be further provided. In one aspect of the present invention, the second phosphor film (3b) that emits primary light and absorbs primary light and that emits secondary light, and emits illumination for illumination may be further provided on the inclined surface (1 2 ). The second solid-state light-emitting element (4b) of the primary light for the phosphor film (3b) and the second solid-state light-emitting device (3b) and the second solid-state light-emitting element (4b) are transmitted once. The second secondary light reflecting film (4b) that reflects light and reflects the secondary light. In one aspect of the present invention, the first solid-state light-emitting device (2) and the first phosphor film (3) may be disposed so as to surround the first solid-state light-emitting device (2) and the primary light and the secondary light. Wall lamp (8). In one aspect of the invention, the bulb (8) may have a tapered shape in which the first solid-state light-emitting element (2) side is expanded toward the first phosphor film (3) side. In one aspect of the present invention, the primary light reflecting film (6) disposed on the emitting surface (13) and reflecting the primary light and transmitting the secondary light may further include one aspect of the present invention. The first solid-state light-emitting element (31b) emits primary light having a single wavelength, and the spectral characteristics of the first secondary light-reflecting film (4a) are narrowband. [Effects of the Invention] According to the present invention, it is possible to provide a light source device that increases the light per unit area of the light-emitting portion 201241544 by the amount of light to enable the light beam to be output with high efficiency. [Embodiment] Next, the first to third embodiments of the present invention will be described with reference to the drawings. In the following description, the same or similar parts are given the same or similar symbols. However, the drawing is only a mode display, and its relationship with the thickness or the plane size, the thickness ratio of each layer, etc. are different from the actual ones, and special attention should be paid. That is, the specific thickness or size is determined by the following description. Further, of course, the drawings also include portions having different dimensional relationships or ratios. In addition, the first to third embodiments shown below are apparatuses and methods exemplified by embodying the technical idea of the present invention, and the technical idea of the present invention is not to make the material, shape, structure, and configuration of the constituent parts. Etc. is limited to the examples shown below. The technical idea of the present invention can be variously modified within the scope of the patent application. (First Embodiment) A light source device according to a first embodiment of the present invention includes a solid-state light-emitting element 2 that emits primary light (primary light source light) as shown in Fig. 1, and absorbs primary light twice. The phosphor film 3 of the light (secondary light source) has a wedge-shaped prism 1 disposed to interpose with the light-weighting film 3 and air, and is disposed between the solid-state light-emitting element 2 and the phosphor film 3 The first secondary light reflecting film 4 that passes through the primary light that is emitted by the solid-state light-emitting element 2 and reflects the secondary light that is emitted by the phosphor film 3 is reflected. -8- 201241544 As the material of 稜鏡1, glass or resin having a refractive index of 1 or more can be used. Each surface of the crucible 1 is a honing surface having a small surface roughness. In addition to the honing processing or the cutting process, the crucible 1 can be formed by molding a mold, and as shown in FIGS. 1 and 2, the air is disposed along the phosphor film 3 and interposed therebetween. The surface (hereinafter referred to as "injection surface") 11 and the surface that is inclined with respect to the incident surface 11 (hereinafter referred to as "inclined surface") 12' are perpendicular to the incident surface 11 and the inclined surface 12 in parallel with each other The two faces (hereinafter referred to as "vertical faces") 15, 16 are gradually widened at intervals between the incident faces 11 and the inclined faces 12, and the incident faces 1 1 , the inclined faces 12 and the two perpendicular faces 15 and 16 are connected, a surface having an area smaller than the area of the phosphor film 3 (hereinafter referred to as "emission surface") 13 and a surface parallel to the emission surface 13 (hereinafter referred to as "corner surface") ) 14. As the solid-state light-emitting element 2 shown in Fig. 1, various light-emitting elements such as an LED or a semiconductor laser can be used. A reflective film is formed on the back side of the solid-state light-emitting device 2, and the primary light emitted by the light-emitting layer is directly or reflected by the reflective film and is emitted toward the surface side. The solid-state light-emitting element 2 has, for example, a rectangular shape in a plan view of about 2 mm X 6 mm. In the first embodiment of the present invention, a blue LED is used as the solid-state light-emitting element 2. The solid-state light-emitting element 2' is supported by a support member 21 having a reflecting surface that reflects primary light. The phosphor film 3 is formed by coating on a substrate 23 such as glass so as to face a portion of the incident surface 11 on the side of the angled surface 14 . The shape of the phosphor film 3 in plan view is approximately the same as that of the solid-state light-emitting element 2. The area of the phosphor film 3 is the same as the area of the solid-state light-emitting element 2. As the material of the fluorescent film -9 - 201241544 body film 3, various kinds of phosphors such as a sulfide type, an oxide type, or a nitride type can be used. The phosphor film 3 functions as a secondary light source, and absorbs primary light emitted by the solid-state light-emitting element 2 as excitation light, and emits secondary light having a wavelength different from that of the primary light. The phosphor film 3 emits ultraviolet to visible light such as green or red when the primary light is blue light. The length (D1+D2) of the substrate 23 is longer than the length D1 of the phosphor film 3 by the angled surface 14 toward the exit surface 13 in the direction parallel to the incident surface 11, and the length of the incident surface 11 is longer than the substrate 23. The length (D1+D2) is longer. The first secondary light reflecting film 4 is approximately the same as the phosphor film 3 on the surface of the substrate 23 facing the phosphor film 3. The way of the area is configured. As the first secondary light reflecting film 4, for example, a two-color film in which a film composed of cerium oxide (SiO 2 ) and titanium oxide (TiO 2 ) having different refractive indices are alternately laminated can be used. The first secondary light reflecting film 4 can be formed on the substrate 23 by a vapor deposition method. Further, a metal mirror 7 such as a silver mirror that reflects all of the visible light at a high reflectance (for example, 98% or more) is disposed in a portion where the first secondary light reflecting film 4 on the substrate 23 is not disposed. The metal film mirror 7 is disposed so as not to be opposed to the portion of the phosphor film 3 on the side of the emitting surface 13 of the incident surface 11 by air. Further, the second secondary light reflecting film 5 is disposed with air interposed therebetween along the inclined surface 1 2 . The second secondary light reflecting film 5 is placed on a substrate 24 such as glass. The length D3 of the second secondary light reflecting film 5 and the substrate 24 is approximately the same as the length (D1 + D2) of the substrate 23 from the angled surface 14 toward the emitting surface 13 in the direction parallel to the inclined surface 12. The second secondary light reflecting film 5, -10- 201241544 transmits primary light and reflects secondary light. As the second secondary light reflecting film 5, for example, a two-color film in which thin films composed of cerium oxide (SiO 2 ) and titanium oxide (Ti02) having different refractive indices are alternately laminated can be used. The second secondary light reflecting film 5' can be formed on the substrate 24 by a vapor deposition method. Further, the primary light reflecting film 6 is disposed on the emitting surface 13. The primary light reflecting film 6 reflects primary light and transmits secondary light. As the primary light reflecting film 6, for example, a two-color film in which a film composed of yttrium oxide (s i Ο 2 ) having a different refractive index and titanium oxide (Ti02) are alternately laminated can be used. The primary light reflecting film 6' can be formed on the emitting surface 13 by a vapor deposition method or the like. Further, a cylinder (lamp) 8.8 of a square column is disposed so as to surround the solid-state light-emitting element 2 and the phosphor film 3. The bulb 8 has an inner wall surface formed by a mirror that reflects primary light and secondary light. The cover member 22 is disposed on the outer side of the bulb 8 so as to surround the bulb 8. Next, an illumination method (principle of light output) using the light source device according to the first embodiment of the present invention will be described with reference to Figs. 3 to 6 . Further, in Fig. 3 to Fig. 6, the primary light is indicated by a dotted arrow, and the secondary light is indicated by a solid arrow. As shown in Fig. 3, the primary light (blue light) emitted from the solid-state light-emitting element 2 passes through the first secondary light-reflecting film 4 and the substrate 2 through the bulb 8, thereby illuminating the phosphor film 3. As shown in Figs. 3 and 4, the phosphor film 3 absorbs primary light as excitation light and emits secondary light (green light). At this time, each of the phosphor particles in the phosphor film 3 absorbs the primary light and emits the secondary light in all directions (360 degrees). Therefore, about half of the light in one light illuminates toward the prism 1 side. On the other hand, the remaining light is emitted to the opposite side, but is reflected by the first secondary light reflecting film 4 at -11 - 201241544, and all of the secondary light is directed toward the other part of the primary light without being irradiated by the phosphor film. 3 light absorbing film 3. As shown in FIG. 5, a part of the primary light of the secondary photo-effect film 3 that emits light in the phosphor film 3 is interposed with air into the facet 丨1, and multiple reflections in the 稜鏡1 Each surface is caused by a high refractive index of 稜鏡1 to a low refractive index, and all of the light above the law angle exceeds the critical angle and is: internally reflected. That is, all of the primary light and the secondary light incident on the two vertical faces 15, 16 and the phosphor film 3 are on the other hand, and on the other hand, the incident surface 11 and the inclined surface 12 are irradiated. The light does not exceed the critical angle, and the light emitted by the conventional 稜鏡1 is reflected by the first secondary light reflecting film 4, the second secondary, and the metal mirror 7 and returns to the 稜鏡1»稜鏡1 surface 1 3 The side-expanded wedge shape, so that the multi-reflection is repeated beyond the critical angle and exceeds the critical angle, and the light output from the internal reverse body film 3 exceeds the critical angle and is repeatedly multiplied, and the phosphor film 3 shown in FIG. The length D1 increases the length of the prism face 11, the exit surface 12, and the two vertical faces 15, 16 by the length D2 of the mirror 7 and the length of the second secondary light reflecting film 5. In this way, the light is emitted out of the system with high efficiency by the exit surface 13 by repeating in the crucible 1. Further, as shown in FIG. 6, the secondary light is on the side of the incident surface 11 稜鏡1. It passes through the firefly and hones the mirror through the mirror 1, and satisfies the angle of the inner corner of the sneaker mirror 1 and emits the internal reflection into the 稜鏡1. The light-reflecting film 5 has a light that is incident on the light. The mirror 1 is incident by the fluorescent light, and the metal film D3 is appropriately multi-reflected and is emitted to the outside of the -12-201241544. When the first secondary light reflecting film 4 is incident, the difference between the glass and the air is Since the refractive index of the glass and the phosphor film 3 is larger than that of the phosphor film 3, the incident angle of the secondary light incident on the secondary light reflecting film 4 becomes small. Therefore, the secondary film 4 can reflect the secondary light with a high probability. As described above, according to the first real light source device according to the present invention, the area of the phosphor film 3 that emits secondary light is larger than the area of the exit surface 13 of the secondary light, so that the light is improved. It is possible to illuminate with high brightness. Then, the phosphor film 3 emits secondary light by the primary light of the bulk light-emitting element 2, and the light is reflected by the first secondary light reflecting film 4, so that the secondary light can be made to each other on the incident surface 1 1 surface 1 2 Multiple reflections are repeatedly performed, and secondary light is efficiently output by 13. Therefore, the unit area can be increased, and the light beam can be output with high efficiency. The results of the simulation of the area and brightness of the phosphor film 3 are shown in Fig. 7. The details of the phosphor film 3 and the angle of the wedge sandwiched by the 稜鏡1 surface 1 1 and the inclined surface 12 are different. The light emitted by the LED as a comparative example is directly incident on the 稜鏡, In the configuration in which the multiple reflections are emitted, the light source device according to the first aspect of the present invention may become nearly twice as bright. In particular, it is effective to increase the area of the phosphor film 3, and it is more than a boundary which is considered to have no effect on the increase of the LED. Therefore, it is expected that the brightness is increased, and the light according to the first embodiment of the present invention can be expected. In the case where the second secondary light reflecting film 5 is disposed, the secondary light emitted by the tilting can be returned to the crucible 1. The refractive index of the first two-light reflection mode emits two spreads (from the secondary and the oblique exit surface beam amount is carried out, but the reverse-introduction type is adopted, even if the source device is 12- 13-201241544 However, the primary light and the secondary light have the spectral characteristics as shown in Fig. 8. The light incident on the 稜鏡1 by the phosphor film 3 is mixed in addition to the secondary light as described above. This is because the light-emitting efficiency of the phosphor film 3 is a component that is not directly absorbed by the phosphor film 3. When this component is mixed with the incident light, the desired spectrum cannot be obtained to deteriorate the solid color. As shown in Fig. 9, the first secondary light reflecting film 4, the second secondary light reflecting film 5, and the primary light reflecting film 6 have a high reflection of 98% or more, that is, by arrangement. In the second secondary light reflecting film 5, the blue light component of the light that does not exceed the critical angle can be discharged to the outside through the second secondary light reflecting film 5. Further, according to the first embodiment of the present invention In the case of the light source device, the primary light reflecting film 6 is disposed by the emitting surface 13 The primary light that is not absorbed by the phosphor film 3 and transmitted can be returned to the crucible 1 without being output from the emitting surface 13. The phosphor film 3 is again excited by the primary light to emit light, thereby increasing the secondary light. The amount of light beam per unit area can be increased. Further, the solid-state light-emitting element 2 and the edge are formed by the physical factors of the electrode disposed on the surface of the solid-state light-emitting element 2 and the wire-bonding closed circuit for supplying electric power to the electrode. According to the light source device according to the first embodiment of the present invention, since the lamp tube 8 is provided, light leakage of the light beam can be prevented in the gap between the solid-state light-emitting element 2 and the crucible 1 (variation) In the modification of the first embodiment of the present invention, as shown in FIG. 10, the first secondary light reflecting film 4 may be disposed between the substrate 23 and the phosphor film 3-14-201241544. Further, The secondary light-reflecting film 4 may cover the substrate 23. The length (D1+D2) of the first secondary light-reflecting film 4 may be longer than the length D1 of the fluorescent element 3. The modification of the first embodiment of the present invention Figure 1 1 The second light of the phosphor film 3 emitting on the side of the substrate 23 is positive The square secondary light reflecting film 4 is reflected, and all of the secondary light is directed toward the side of the crucible 1. The secondary light emitted from the intruding surface 11 by the crucible 1 is reflected by the first reflecting film 4 and returned to the crucible 1 (Second embodiment) In the first embodiment of the present invention, a group of light sources having a solid hair 2 and a phosphor film 3 is described. In the first mode of the present invention, two groups are described. In the light source device according to the second embodiment of the present invention, the light source device of the second embodiment of the present invention is provided on the side of the incident surface 11 of the crucible 1 and is disposed along the incident S, and absorbs the primary light. And the first solid-state light-emitting device 2a for emitting the second light, and the first solid-state light-emitting device 2a for emitting the first phosphor film 3a, and the first phosphor film: 1 for the solid-state light-emitting device 2a. Between the two, the secondary light secondary light reflecting film 4a is reflected by the primary light. The first solid-state light-emitting device 2a is supported between the solid-state light-emitting device 2a and the first phosphor film 3a by the support member 21a, and is disposed so as to cover the member 22a. The first phosphor film 3a and the first secondary light reflecting film 4a are shown as a full-length photo film, and the second photo-light element 2 is implemented as shown in Fig. 12 i η and 1 fluorescent sub-light. La and the first number one. The first tube 8a is placed on the base -15-201241544 board 23a. A metal film mirror 7a such as a silver mirror that reflects all of visible light at a high reflectance (for example, 98% or more) is disposed in a portion of the substrate 23a where the first phosphor film 3a is not disposed. Further, the light source device according to the second embodiment of the present invention is provided on the side of the incident surface 12 of the crucible 1 and interposed with air along the inclined surface 12, and absorbs primary light to emit secondary light. The second phosphor film 3b and the second solid-state light-emitting element 2b that emits primary light for illuminating the second phosphor film 3b, and the second phosphor film 3b and the second solid-state light-emitting element Between 2b, the second secondary light reflecting film 4b that transmits primary light and reflects the secondary light. The second solid-state light-emitting element 2b is supported by the support member 21b. A bulb 8b and a covering member 22b are disposed between the second solid-state light-emitting device 2b and the second phosphor film 3b. The second phosphor film 3b and the second secondary light reflecting film 4b are disposed on the substrate 23b. A metal film mirror 7b such as a silver mirror that reflects all of the visible light at a high reflectance (for example, 98% or more) is disposed in a portion of the substrate 23b where the second phosphor film 3b is not disposed. The other configuration is substantially the same as the first embodiment of the present invention, and thus the overlapping description will be omitted. Next, an example of an illumination method using the light source device according to the second embodiment of the present invention will be described with reference to Fig. 12 . The primary light emitted from the first solid-state light-emitting device 2a illuminates the first secondary light-reflecting film 4a through the bulb 8a, and illuminates the first phosphor film 3a through the substrate 23a. The first phosphor film 3a absorbs primary light and emits secondary light. On the other hand, -16-201241544, the primary light emitted from the second solid-state light-emitting element 2b illuminates the second secondary light-reflecting film 4b through the bulb 8b, and illuminates the second phosphor film 3b through the substrate 23b. The second phosphor film 3b absorbs primary light and emits secondary light. Secondary light from the first phosphor film 3a and the second phosphor film 3b, and secondary light and primary light reflected from the first secondary light reflecting film 4a and the second secondary light reflecting film 4b, respectively The residual light component is incident on the crucible 1 through the air, and the first secondary light reflecting film 4a, the second secondary light reflecting film 4b, and the metal film mirror 7a, 7b in the vicinity of the crucible 1 and the crucible 1 are repeatedly reflected. And output by the exit surface 13 . At this time, a part of the secondary light emitted from the first phosphor film 3a and the second phosphor film 3b enters the first phosphor film 3a and the second phosphor film 3b which face each other. The first phosphor film 3a and the second phosphor film 3b exhibit absorption characteristics for primary light, but do not have absorption characteristics for secondary light, so that secondary light passes through the first phosphor film 3a and the second phosphor, respectively. The light-emitting film 3b or a part of the light is scattered, and is reflected by the first secondary light-reflecting film 4a and the second secondary light-reflecting film 4b, and is again transmitted through the first phosphor film 3a and the second phosphor film 3b.稜鏡1. On the other hand, part of the residual component of the primary light is also incident on the first phosphor film 3a and the second phosphor film 3b on the opposite side, but the first phosphor film 3a and the second phosphor are also incident on the first phosphor film 3a and the second phosphor 3b. The body film 3b absorbs and contributes to the luminescence of the secondary light. Further, a part of the primary light is reflected by the primary light reflecting film 6 on the emitting surface 13 and returned to the inside of the system. When the primary light is completely blocked, the multiple reflections are repeated, and the first phosphor film 3a and the second phosphor film 3b are again incident on the second phosphor film 3b and absorbed to contribute to the light emission. The primary light of the first phosphor film 3a and the second phosphor film 3b is again transmitted through the first to second light reflecting film 4a and the second secondary light reflecting film 4b and the substrates 23a and 23b. The lamps 8a and 8b return to the first solid-state light-emitting element 2a and the second solid-state light-emitting element 2b. This light is reflected by the first solid-state light-emitting element 2a and the second solid-state light-emitting element 2b, and the first phosphor film 3a and the second phosphor film 3b are again illuminated. In this manner, the residual component is also contained, and all of the primary light is absorbed by the first phosphor film 3a and the second phosphor film 3b to contribute to the light emission of the secondary light. As described above, according to the light source device according to the second embodiment of the present invention, it is possible to increase the amount of light beams per unit area in a system for synthesizing a plurality of light sources, and to perform illumination with high efficiency. (Third embodiment) A light source device according to a third embodiment of the present invention is as shown in the figure! The lamp tube 8 shown in Fig. 3 has a conical shape in which the solid-state light-emitting element 2 side is expanded toward the phosphor film 3 side, and is different from the first embodiment of the present invention. The area of the phosphor film 3 and the first secondary light reflecting film 4 is larger than the area of the solid state light emitting device 2. The other configuration is substantially the same as the first embodiment of the present invention, and therefore the overlapping description will be omitted. Next, an example of an illumination method using a light source device according to an embodiment of the present invention will be described with reference to Figs. 14 and 15 . As shown in Fig. 14, the primary light emitted from the solid-state light-emitting element 2 has an angle of 0 法 to the normal direction of the surface of the solid-state light-emitting element 2, and is multi-reflected in the bulb 8 while facing the exit surface 1 3 » at this time, The reflection -18-201241544 in the tube 8 is inclined, so that the light is reflected once, and the angle β 0,0 1,0 2 toward the phosphor film 3 becomes small. That is, the primary light emitted from the bulb 8 becomes approximately parallel light. The primary light emitted from the bulb 8 passes through the substrate 23, and passes through the first secondary light reflecting film 4 to illuminate the phosphor film 3. Here, as shown in Fig. 15, the angular characteristics of the spectroscope constituting the first secondary light reflecting film 4 are such that when the angle of the incident light is increased, the spectral reflectance characteristic shifts to the shorter wavelength side. Therefore, even if the light is not transmitted once, the component having a large angle of light cannot be transmitted, and the phenomenon that the phosphor film 3 cannot be sufficiently illuminated by the primary light cannot be obtained, and the desired high luminance cannot be obtained. On the other hand, according to the third embodiment of the present invention, since the bulb 8 has a tapered shape, the primary light can be made to be approximately parallel light, so that it is not reflected by the angular characteristics of the first secondary light reflecting film 4. The phosphor film 3 can be illuminated with high efficiency. Next, the illuminated phosphor film 3 absorbs primary light and emits secondary light (green light). At this time, each of the phosphor particles in the phosphor film 3 absorbs blue light and emits green light in all directions (360 degrees). Therefore, about half of the light of one primary light illuminates toward the side of the 稜鏡1, but the remaining light illuminates toward the opposite side of the substrate 2 3 . The light having a considerable angle is incident on the first secondary light reflecting film 4, but by the angular characteristics of the first secondary light reflecting film 4, since the reflection band of the secondary light is wide, it can reflect almost all The light is facing the side of 稜鏡1. Next, as shown in FIG. 16, the secondary light emitted from the phosphor film 3 is repeated by the crucible 1, the first secondary light reflecting film 4, the second secondary light reflecting film 5, and the metal film mirror 7. Multiple reflections are emitted from the exit surface 13. At this time, since the bulb 8 has a tapered shape, the light incident on the bulb 8 is easily returned to 稜鏡1 as compared with the case where the diameter of the bulb 8 is constant. As described above, according to the light source device according to the third embodiment of the present invention, the phosphor film 3 can be illuminated with high efficiency by the lamp tube 8 having a tapered shape, and the phosphor film 3 can be illuminated. The increase in brightness makes it possible to increase the amount of light per unit area of the emitted light beam. Further, when multiple reflections are made in the crucible 1 and the primary light returned to the phosphor film 3 is incident at a larger incident angle than the specific incident angle, the first secondary optical reflection film 4 can be returned to the fluorescent Light body film 3. Therefore, the primary light can be used to illuminate the phosphor film 3 with high efficiency. (First Modification) As a first modification of the third embodiment of the present invention, as shown in FIG. 17, two sets of light sources are provided, and the lamps 8a and 8b are respectively composed of the first solid-state light-emitting element 2a and the second solid. The light-emitting element 2b may have a tapered shape toward the first phosphor film 3a and the second phosphor film 3b. The other configuration is substantially the same as the light source device according to the second embodiment of the present invention shown in Fig. 12, and therefore the overlapping description will be omitted. (Second Modification) As a second modification of the third embodiment of the present invention, as shown in Fig. 18, lasers 31a and 31b for outputting a single wavelength may be used instead of the LED. The lasers 3 1 a, 3 1 b are arranged outside the system. The laser array using a plurality of lasers 31a and 31b is shown in Fig. 18. However, the lasers 31a and 31b may be used one by one, and the number is not particularly limited. Laser 3 1 a, 3 1 b as -20- 201241544 Figure 19 shows a single wavelength of blue laser light. The light beams output from the laser beams 31a and 31b radiate radially, and are parallel light by the parallel lenses 32a and 32b. Thereafter, the plurality of parallel lights are incident on the end faces of the lamps 8a' 8b by the common condensing lenses 33a, 33b. The light beams that are multi-reflected in the lamps 8a and 8b illuminate the first phosphor film 3a and the second phosphor film 3b as approximately parallel lights, respectively. The other configuration is substantially the same as the configuration shown in Fig. 17, and the overlapping description will be omitted. When a single wavelength is output as in the case of the blue laser as shown in FIG. 19, the first secondary light reflecting film 4a and the second secondary light reflecting film 4b are used as shown in FIG. The approximately parallel light of the body film 3 is permeable, and the reflection film of the return light band which is reflected by the multiple reflections in the 稜鏡1 can be made to block the primary light, so that all the primary light is in the ray. The light emission of the photo film 3 contributes. (Other Embodiments) As described above, the first to third embodiments of the present invention are described, and the description of the present invention and the drawings are not to be construed as limiting the scope of the invention. It is thus apparent that those skilled in the art will be able to deduce various alternative embodiments, embodiments, and related applications. For example, instead of the second secondary light reflecting film 5 shown in Fig. 1, a metal mirror such as a silver mirror that reflects all visible light at a high reflectance (for example, 98% or more) may be provided. By arranging the metal film mirror, it is possible to return the primary light that is not absorbed by the phosphor film 3 and return it to the crucible 1, and then re-excite the phosphor film 3 to emit light, thereby increasing the secondary light and increasing each The amount of light beam per unit area - 21,041, 544. Further, in the first to third embodiments of the present invention, the wedge-shaped 稜鏡1 is described, but instead of 稜鏡1, the air is conditioned as shown in FIG. The wedge-shaped housing IX can also be used. In this case, a metal film mirror that reflects primary light and secondary light or a secondary light reflection film that reflects secondary light is formed on the inner wall surface of the casing lx. Further, the opening portion 17 for injecting the secondary light from the phosphor film 3 and the opening portion 18 having a larger area than the opening portion 17 for emitting the secondary light may be provided. In the first to third embodiments of the present invention, the illuminating surface 11 and the inclined surface 12 may be significantly larger than the emitting surface 13. Further, a configuration in which the area of the phosphor film 3 is remarkably larger may be obtained as compared with the emitting surface 13 of the crucible 1. Further, it is also applicable to the case where the entrance surface 1 1 and the inclined surface 1 2 have a continuous wedge shape without the angled surface 1 4 ′ of the 稜鏡i. Further, the vertical faces 15, 16 are preferably perpendicular to the incident surface 1 1 and the inclined surface 12 and are parallel to each other, and may not be strictly vertical or parallel. Further, the surface 13 and the angled surface 14 are preferably parallel to each other, and may not be strictly parallel. Further, in the first to third embodiments of the present invention, the case where the blue light is emitted as the primary light and the green light is emitted as the secondary light is described, but the secondary light excited by the blue light of the primary light is emitted as shown in the figure. Red light in the wavelength band shown in Fig. 8 is also possible. Further, it is also possible to emit a desired spectrum in the visible light region by using ultraviolet light having a short wavelength (high energy) as the excitation light. In this case, as the secondary light reflecting films 4, 5, 4a, and 4b, a film that reflects and transmits the spectrum of each of the bands can be appropriately selected. -22-201241544 Further, the light source device according to the first to third embodiments of the present invention can be applied to a spatial light modulation element having a secondary light that is modulated by a light source device, and is modulated. The image of the secondary light is imaged and displayed on an image display device of an imaging optical system such as a screen. As such, the present invention is not limited to the foregoing description, and of course, various embodiments within the scope of the claims are also included. That is, the technical scope of the present invention is determined in accordance with the specific matters of the invention which are within the scope of the patent application as described in the foregoing description. The present light source device can be used as a light source of a projector. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an example of a light source device according to a first embodiment of the present invention. Fig. 2 is a perspective view showing an example of a first embodiment of the present invention. Fig. 3 is a schematic view for explaining an illumination method relating to the first embodiment of the present invention. Fig. 4 is a schematic view for explaining another illumination method relating to the first embodiment of the present invention. Fig. 5 is a schematic view for explaining another illumination method relating to the first embodiment of the present invention. Fig. 6 is a schematic view for explaining another illumination method relating to the first embodiment of the present invention. Fig. 7 is a graph showing the results of simulations relating to the relationship between the area of the light-emitting portion and the brightness in the first embodiment of the present invention and the comparative example -23-201241544. Fig. 8 is a view showing the spectral distribution of primary light and secondary light according to the first embodiment of the present invention. Fig. 9 is a view showing the spectral characteristics of the primary light-reflecting film and the secondary light-reflecting film according to the first embodiment of the present invention. Fig. 10 is a cross-sectional view showing an example of a light source device according to a modification of the first embodiment of the present invention. Fig. 1 is a schematic view for explaining an illumination method according to a modification of the first embodiment of the present invention. Fig. 12 is a cross-sectional view showing an example of a light source device according to a second embodiment of the present invention. Fig. 13 is a cross-sectional view showing an example of a light source device according to a third embodiment of the present invention. Fig. 14 is a schematic diagram for explaining a lighting method relating to the third embodiment of the present invention. Fig. 15 is a view showing the angular characteristics of the secondary light reflecting film according to the third embodiment of the present invention. Fig. 16 is a schematic view for explaining the illumination method relating to the third embodiment of the present invention. Fig. 1 is a cross-sectional view showing an example of a light source device according to a first modification of the third embodiment of the present invention. Fig. 18 is a cross-sectional view showing an example of a light source device according to a second modification of the third embodiment of the present invention. Fig. 19 is a view showing the spectral distribution of the primary light and the secondary light in the second variation of the second embodiment of the present invention, in the second embodiment of the present invention. Fig. 20 is a view showing the angular characteristics of the secondary light reflecting film according to the second modified example of the third embodiment of the present invention. Fig. 2 is a perspective view showing an example of a casing relating to other embodiments of the present invention. [Description of main component symbols] 1 : 稜鏡lx : housing 2, 2a, 2b: solid-state light-emitting elements 3, 3a, 3b: phosphor film 4, 4a, 4b, 5: secondary light-reflecting film 6: Light reflecting film 7, 7a' 7b: metal film mirror 8, 8 a, 8 b : tube 1 1 : incident surface 1 2 : inclined surface 1 3 : emitting surface 1 4 : angled surface 15, 16 : vertical surface 1 7, 18: opening portion 2 1 , 2 1 a, 2 1 b : support members 22, 22a, 22b: covering members 23, 23a, 23b, 24: substrate - 25 - 201241544 31a, 31b: laser 32a, 32b : Parallel lens 3 3 a, 3 3 b : Condenser lens-26-