200918829 九、發明說明： 【發明所屬之技術領域】 本發明係關於—種光輸出裝置，其包括—光源及一用於 從該光源引導光的光導，該光導具有一凹形内側及一外 側，該等外側及内側彼此成錐形。本發明亦關於—種適用 於如此之光輸出裝置中的光導。本發明進一步關於一種具 有至少一個如此之光導的照明器具。 【先前技術】 利用發光二極體（LED)作為光源的光輸出裝置已逐漸流 行。LED具有較咼的起始亮度，典型的係卜5〇 Md/m2。如 果來自LED之光之角分佈未被適當控制，該光輸出裝置將 產生強光。為降低強光，熟知的係直接在一 led上放置一 簡單的光學元件，例如—透鏡、cpc、反射鏡。然而，該 等LED之峰值亮度被保持，當一人看著該光輸出農置時該 光之該感覺亮度仍舊太高。 US-A 7，181，378揭示一種折射、反射、以射及折射 (rxir)裝置’其具mLED之裝置。該透鏡具有一 上表面’該表面包括一被一全内反射週邊表面圍繞的反射 塗布中央區域並延伸至一安裝凸緣。該下表面包括一具有 入口表面及-包圍的反射面的中央空腔，例如_反射塗 布表面及/或一全内反射（TIR)表面。光從一焦點向外傳播 以經由該入口表面進入該透鏡’被該上表面反射至一反射 鏡以被再次反射，然後經由該上表面離開該透鏡。在如此 -裝置中’來自該等LED之該光之該角分佈相對較狭窄， 131902.doc 200918829 該峰值亮度相對較高。觀察者會有該光直接來自於該光源 的印象。 【發明内容】 本發明之一目的係提供一種光輸出裝置，其中被耦合出 之光的感覺峰值亮度被降低。 因此，本發明提供一光輸出裝置，其包括一光源及一用 於引導來自該光源之光的光導，該光導具有一凹形内側及 一外側，該等外側及内側彼此成錐形，其中該光導被配置 以在該光導之該内側及/或該外側上之至少兩個全内反射之 後在該光導之該内側之一區域之上將該光耦合出該光導。 本發明係以下列觀察為基礎： - 在一具有兩側之光導中，被耦合進該光導之該光之一 部分將藉由全内反射輪流地被此兩側反射^這可藉由一折 射率高於該光導外之一媒介之折射率的光導達成。當這兩 個側面成錐形，在該側面上相對於該側面之該法線之入射 光之該角度將藉由一在另一側面上之反射而變的更小。數 次反射之後，此角度將最終低於全内反射之該臨界角，該 光將被搞合出。 -被耦合進入該光導之該光被視為在一錐形體形式中的 束光線。ik著該光經由該光導傳播，該錐形體之截面將 增大。當該錐形體之該截面變得更大，該等光線被分佈於 一更大之區域，降低該峰值亮度。 在被耦合出該光導之前，該光經歷全内反射之次數取決 於該内側及該外侧之間的該角度、該光源相對於該光導的 131902.doc 200918829 定位、該光源之強度分佈、該（等）光源之配置、該光導之 折射率及該光導外之該媒介。這些參數可被調整使得被耦 合進該光導之該光之一大部分發生兩個或更多全内反射。 藉由適當地配置該光導之該等上述參數以便在至少兩個 王内反射之後將該光搞合出該光導，當該光被耦合出時被 輕合進入之該光之該峰值亮度將被極大降低。以這種方式 該照明器具可獲得一改進的視覺舒適度。 根據本發明之一較佳實施例，該光輸出裝置之該光導係 方疋轉對稱的。然而’該光輸出裝置之該光導亦可具有一擴 圓形狀或一多邊形狀，例如一六邊形狀、八邊形狀或相似 形狀。該光導可具有一藉由圍繞一中軸旋轉一楔形幾何體 而形成的形狀。該等楔表面亦可具有一輕微的曲率以微調 該強度分佈。 根據本發明之另一實施例，該光輸出裝置進一步包括一 被該光導之該内侧圍繞的光學體，該光學體之折射率低於 該光導之該内側之折射率。藉由選擇一具有一適當折射率 的光學體，即使在該光導之該尺寸被限制時，控制全内反 射之次數亦是可能的。 根據本發明之另一實施例，該外側被一反射面覆蓋。藉 由此實施例，從該外側被耦合出之該光被反射向内侧。這 導致所有光將從該光導之該内側離開該光輸出裝置。 根據本發明之另一實施例’該光導包括一被配置用於將 S亥光叙合進該光導的基側。 根據本發明之另一實施例，一填光層被配置於該基側 131902.doc 200918829 上。該磷光層可包括例如YAG:Ce或多種磷光劑之一混合 物。該磷光層將來自該光源之該光轉換成具有不同波長之 光。s亥填光劑可被塗布於一薄片上，該薄片可被配置於該 基側上。 根據本發明 < 另一實施例，該光源被安裝至一被提供於 該裝置之一安裝部分中的光源安裝元件，該光源被該基側 圍繞。該裝置之該安裝部分可為該基側之邊緣。該光源安 裝元件可為一圓盤，其部分地或完全地覆蓋被該基侧圍繞 之該空間。這提供該光輸出裝置之一替代形式，其中該光 源不直接安裝至該基側。 根據本發明之另一實施例，從該光導耦合出來之該光經 由一發光窗而發出’該發光窗被該光導之一閒置邊緣界 定。 根據本發明之另一實施例，該裝置包括一在該光導之中 心的遮蔽元件，該元件具有一用於防止來自該光源之該光 經由該發光窗被直接發出的反射或吸收表面。藉由此配 置’可為該錐形角獲得更多的設計自由度。被該光導之該 基側圍繞之該空間及該遮蔽元件可充當一光混合腔，用於 在該光被耦合進入該光導之前混合來自該光源之該光。 根據本發明之另一實施例，該内側及該外側在從該基側 至該閒置邊緣的方向中彼此成錐形。 根據本發明之另一實施例，該外側在從該閒置邊緣到該 基側之方向中逐漸縮小。這使該光可經由比該光被耦合進 入之處的該基側更大的發光窗而被發出。 131902.doc 200918829 根據本發明之另一實施例，該光源包括一個或多個 LED。舉例來說，該光源可包括一單個lED(例如白色或單 色）或多個LED(例如，R、G、b或r、g、B、A)。從多個 角度來說’ LED係有利的’例如能源效率及較長的使用壽 命。除了 LED，亦可使用其他適當的光源，例如其他半導 體光源（例如雷射二級體）。當—磷光層被配置於該基側 上，該磷光劑將來自一個或多個藍色LED之該光之部分轉 換成黃光。該組合產生白光。 根據本發明之另-態樣，-適用於根據本發明之該光輸 出裝置中的光導被提供。200918829 IX. Description of the Invention: The present invention relates to a light output device comprising: a light source and a light guide for guiding light from the light source, the light guide having a concave inner side and an outer side, The outer and inner sides are tapered to each other. The invention is also directed to a light guide suitable for use in such a light output device. The invention further relates to a lighting fixture having at least one such light guide. [Prior Art] A light output device using a light emitting diode (LED) as a light source has gradually flowed. LEDs have a relatively low initial brightness, typically 5 〇 Md/m2. If the angular distribution of light from the LED is not properly controlled, the light output device will produce intense light. To reduce glare, it is well known to place a simple optical component, such as a lens, cpc, or mirror, directly on a led. However, the peak brightness of the LEDs is maintained, and the perceived brightness of the light is still too high when one looks at the light output. US-A 7,181,378 discloses a device for refraction, reflection, and refraction (rxir) devices having an mLED. The lens has an upper surface' that includes a reflective coated central region surrounded by a total internal reflective peripheral surface and extends to a mounting flange. The lower surface includes a central cavity having an inlet surface and a surrounding reflective surface, such as a reflective coating surface and/or a total internal reflection (TIR) surface. Light travels outward from a focus to enter the lens through the entrance surface and is reflected by the upper surface to a mirror to be reflected again, and then exits the lens via the upper surface. In this case - the angular distribution of the light from the LEDs is relatively narrow, 131902.doc 200918829 The peak brightness is relatively high. The observer will have the impression that the light is directly from the source. SUMMARY OF THE INVENTION An object of the present invention is to provide a light output device in which the perceived peak luminance of the coupled light is lowered. Accordingly, the present invention provides a light output device including a light source and a light guide for guiding light from the light source, the light guide having a concave inner side and an outer side, the outer and inner sides being tapered to each other, wherein The light guide is configured to couple the light out of the light guide over a region of the inner side of the light guide after at least two total internal reflections on the inner side and/or the outer side of the light guide. The invention is based on the following observations: - in a light guide having two sides, a portion of the light coupled into the light guide will be reflected by the two sides by total internal reflection in turn; A light guide that is higher than the refractive index of a medium other than the light guide is achieved. When the two sides are tapered, the angle of incident light on the side relative to the normal to the side will be smaller by reflection on the other side. After several reflections, this angle will eventually be lower than this critical angle of total internal reflection, which will be combined. The light that is coupled into the light guide is considered to be a beam of light in the form of a cone. Ik that the light propagates through the light guide, and the cross section of the cone will increase. As the cross section of the cone becomes larger, the rays are distributed over a larger area, reducing the peak brightness. The number of times the light undergoes total internal reflection before being coupled out of the light guide depends on the angle between the inner side and the outer side, the position of the light source relative to the light guide 131902.doc 200918829, the intensity distribution of the light source, The configuration of the light source, the refractive index of the light guide, and the medium outside the light guide. These parameters can be adjusted such that a majority of the light coupled into the light guide undergoes two or more total internal reflections. By appropriately arranging the above parameters of the light guide to engage the light out of the light guide after at least two in-parent reflections, the peak brightness of the light that is lightly coupled when the light is coupled out will be Greatly reduced. In this way the luminaire achieves an improved visual comfort. According to a preferred embodiment of the invention, the light guide of the light output device is symmetrical. However, the light guide of the light output device may also have a rounded shape or a polygonal shape, such as a hexagonal shape, an octagonal shape or the like. The light guide can have a shape formed by rotating a wedge geometry about a central axis. The wedge surfaces may also have a slight curvature to fine tune the intensity distribution. In accordance with another embodiment of the present invention, the light output device further includes an optical body surrounded by the inner side of the light guide, the optical body having a refractive index lower than a refractive index of the inner side of the light guide. By selecting an optical body having a suitable index of refraction, it is possible to control the number of total internal reflections even when the size of the light guide is limited. According to another embodiment of the invention, the outer side is covered by a reflective surface. By this embodiment, the light coupled out from the outside is reflected to the inside. This causes all of the light to exit the light output device from the inside of the light guide. According to another embodiment of the invention, the light guide includes a base side configured to incorporate S-light into the light guide. In accordance with another embodiment of the present invention, a fill layer is disposed on the base side 131902.doc 200918829. The phosphor layer may comprise, for example, a mixture of YAG:Ce or a plurality of phosphors. The phosphor layer converts the light from the source into light having a different wavelength. The s-filler can be applied to a sheet which can be disposed on the base side. According to another embodiment of the invention, the light source is mounted to a light source mounting member provided in a mounting portion of the device, the light source being surrounded by the base side. The mounting portion of the device can be the edge of the base side. The light source mounting element can be a disk that partially or completely covers the space surrounded by the base side. This provides an alternative to the light output device in which the light source is not directly mounted to the base side. In accordance with another embodiment of the present invention, the light coupled from the light guide is emitted through an illumination window. The illumination window is defined by an idle edge of the light guide. In accordance with another embodiment of the present invention, the apparatus includes a shield member at a center of the light guide, the member having a reflective or absorbing surface for preventing direct passage of light from the source through the illumination window. By this configuration, more design freedom can be obtained for the taper angle. The space surrounded by the base side of the light guide and the shielding element can act as a light mixing cavity for mixing the light from the light source before it is coupled into the light guide. According to another embodiment of the invention, the inner side and the outer side are tapered from each other in a direction from the base side to the idle edge. According to another embodiment of the invention, the outer side tapers in a direction from the idle edge to the base side. This allows the light to be emitted via a larger illumination window than the base side where the light is coupled into. 131902.doc 200918829 According to another embodiment of the invention, the light source comprises one or more LEDs. For example, the light source can include a single lED (e.g., white or single color) or multiple LEDs (e.g., R, G, b or r, g, B, A). From a number of perspectives, 'LEDs are advantageous' such as energy efficiency and long life. In addition to LEDs, other suitable light sources can be used, such as other semiconductor light sources (e.g., laser diodes). When the phosphor layer is disposed on the base side, the phosphor converts the portion of the light from the one or more blue LEDs to yellow light. This combination produces white light. According to another aspect of the invention, a light guide suitable for use in the light output device according to the invention is provided.
及/或該外側上之至少兩個全内反射之 以在該光導之該内 之後在該光導之該 I 内側之一區域之上將該光耦合出該光導。 根據本發明之另—態樣，m具被提供，其包括一 根據本發明的照明器具外殼及至少一個光源。 應主思本發明涉及該等請求項中所列舉之特徵之所 能的組合。 【實施方式】 示實施例閣明及解And/or at least two total internal reflections on the outer side are coupled out of the light guide over a region of the inner side of the light guide after the light guide. According to another aspect of the invention, an apparatus is provided which includes a lighting fixture housing and at least one light source in accordance with the present invention. It is to be understood that the invention relates to a combination of the features recited in the claims. [Embodiment]
本發明以上及其他態樣將參考圖式所 參考圖la， 131902.doc -10- 200918829 包括—光源101及一光導102。該光導102具有一旋轉對稱 形式’其係藉由圍繞一中軸z旋轉一楔形幾何而形成，如 圖1 b所顯示。該楔子可被在此圖中所指示的該等參數（長 度a，長度b，距離X ,角度ψ)所描述。該構造之該總高度 被表述為 斤=a*sin(90-y)+Z)*sinv 該光學元件具有一發光窗107，其直徑d被界定為 d=(x+b* cosi//) 該光導102包括一内側1〇3、一外側104、一基側1〇5及一 閒置邊緣106。因為該光導102係藉由圍繞一中軸旋轉一楔 形幾何而形成，所以該内側103具有一旋轉對稱凹形形狀 (截頂錐形）。在從該光導之該基側1〇5到該閒置邊緣1〇6之 方向中該内側及該外侧103、1〇4彼此成錐形，在該方向中 該等兩個側面相交並產生一角度α。該閒置邊緣丨〇6界定一 發光窗107，該光從該窗發出。在從該閒置邊緣i〇6到該基 側105之該方向中，該外側104逐漸縮小。該光導1〇2之該 外側104被一鏡108覆蓋。該鏡1〇8可由習知的銀合成物製 成。被該内側103及該發光窗1 〇7包圍之該空間為一空腔， 其至少部分地被一光學體109填充，該光學體ι〇9之折射率 低於該光導102之該内側103之一折射率。 在此實施例中’該光源101被提供於—磷光層丨12上，該 填光層被配置於該光導102之該基側1 〇5上。然而，應注意 該磷光層112係可選的，該光源101可被直接提供於該基側 105上°該光源1 〇 1包括複數個發出不同顏色之光例如紅 131902.doc - 11 - 200918829 色、綠色及藍色的LED 101。該磷光層112可包括例如 YAG:Ce或多種磷光劑之一混合物。藉由此配置，該填光 層112將部分來自藍色LED之光轉換為黃光。該黃光及未 轉換之藍光之該組合產生白光。該光導102可由聚曱基丙 烯酸甲酯（PMMA)、聚碳酸酯、玻璃或類似材料製成。 來自該光源101之該光在該内側及外側1 〇 3 ' 1 〇 4之間被 發射進入該光導1 02。在該光導1 〇2中之該光線發射將輪流 地在該内側及該外側103、104上被反射。經由反射，在該 内側103上相對於該内側1 〇3之該法線的光入射角將最終小 於全内反射之該臨界角’該光將被耦合出該内側1 〇3。在 該内側103之一區域上，該光將被耦合出，然後經由該發 光窗1 0 7被發出。 圖2顯示一被耦合出根據本發明之一示例性光輸出裝置 之該光的角分佈。在此圖中’ 一藉由旋轉一楔形幾何而形 成的光輸出裝置之一角分佈被顯示，該裝置之尺寸為長度 a=5 mm，長度b=30 mm，距離x=〇 mm，角度ψ=35度。在 此示例性實施例中，三個具有1 mm2之尺寸的LED位於距 離該中軸2 mm處並圍繞該軸均勻分佈。應理解這些尺寸及 該等LED之該配置僅為實例，本發明並不限於此實施例。 在該角分佈中該截停值由該角度ψ決定。 在圖3中，根據本發明之光導之一截面被顯示，其中光 線在該内側103及該外側1〇4之間經由該光導傳播。在該光 導1 02中傳播之該等光線被顯示為一光線錐c。該圖顯示經 由反射在該光線錐之截面之該區域中的變化。該錐在其表 131902.doc -12· 200918829 面上具有光線A1及B1。在該内側103上入射之該光線A1將 被該内側反射並成為一光線A2。然後該光線A2將被該外 側104反射並成為一光線A3。同樣，在該内側1 〇3上入射之 該光線B1將被該内側反射並成為B2，然後其將被該外側 104反射並成為B3。該等光線A3及B3接觸該内側103的該 等點之間之該距離將大於該等光線A1及B1接觸該内側1〇3 的該等點之間之該距離。因此在反射之後，該光線錐之該 截面之該區域將變得更大。意即該等光線入射於更大區域 上’所以如果該等光線被耦合出來，該感覺亮度將被降 低。 在圖4中’該光源被安裝至一提供於該基側之一邊緣上 的光源安裝元件110。該光源安裝元件封住被該基側包圍 的該空間。該光導102之該基側1〇5延伸至該光導之該中 轴。大體來說來自該光源之所有光線都經由該基側被耦合 進入該光導。 在圖5中，該光源被安裝至一提供於該底側面之一邊緣 上的光源安裝元件11 0 ’相似於圖4。該光導1 〇2之該基側 105不延伸至該中轴。該光輸出裝置包括一在其中央的遮 蔽元件111 ’該元件具有一反射面。大體來說來自該光源 之該所有光線都經由該基側被偶合進入該光導。該遮蔽元 件111阻止來自该光源1 〇 1未經過在該内側及外側1 〇3、1 〇4 之間之反射的直接光線。因此防止來自該光源1〇1之該光 被直接經由該發光窗107發出。應注意該遮蔽元件n 1可替 代地具有一吸收表面。 131902.doc -13- 200918829 圖6顯示一照明器具外殼2 0 0 ’其包括複數個光源安裝元 件Π〇及複數個光導102。該光導102具有一凹形内側1〇3及 一外側104 ,該等内、外側彼此成錐形。該光導1〇2被配置 以在該光導102之該内側103及/或外側1〇4上之至少兩個全 内反射之後在該光導1〇2之該内側103之一區域之上將該光 耦合出該光導102。 在該等請求項中’在括弧中之任何參考數字不應被理解 為限制該請求項。動詞“包括，，及其詞形變化之使用不排除 除了在-請求項中說明的元件或步驟之外的元件或步驟之 存在。在-元件之前之冠詞‘‘―”不排除複數個此種元件之 存在。某些方法被列於互不相同的附屬請求項中之事實並 不表不不能使用這些方法之一結合以獲利。 【圖式簡單說明】 圖U概要地顯示根據本發 截面. 尤物出裝置之一實施例的 之—實施例的一楔形幾 圖lb顯示構成根據本發明之光導 何體的旋轉； ::一=出根據本發明之先輪“置之-實 施例的 該光之一角分佈； ▲圖3為在根據本發明之光輸出裝置 該反射的概要圖； 圖4概要地顯示根據本發明 的截面；及 先輸出裝置之另一實施例 之一實施例中的光之 圖5概要地顯 示根據本發明 之光輸出裳 置之另一實施例 I31902.doc 14 200918829 的截面。 圖6概要地顯示根據本發明之照明器具之一實施例的截 面。 【主要元件符號說明】 100 光輸出裝置 101 光源 101a 光源 101b 光源 102 光導 103 内側 104 外側 105 基側 106 閒置邊緣 107 發光窗 108 反射面 109 光學體 110 光源安裝元件 111 遮蔽元件 112 磷光層 200 照明器具外殼 a 長度 A1 光線 A2 光線 A3 光線 131902.doc 15· 200918829 A4 光線 A5 光線 b 長度 B1 光線 B2 光線 B3 光線 B4 光線 B5 光線 C 光線錐 d 直徑 h 總南度 X 距離 Z 中軸 a 角度 Ψ 角度 131902.docThe above and other aspects of the present invention will be described with reference to the drawings, la, 131902.doc-10-200918829, including a light source 101 and a light guide 102. The light guide 102 has a rotationally symmetric form 'which is formed by rotating a wedge geometry about a central axis z, as shown in Figure 1 b. The wedge can be described by the parameters (length a, length b, distance X, angle ψ) indicated in this figure. The total height of the configuration is expressed as jin = a * sin (90 - y) + Z) * sinv The optical element has a luminescent window 107 whose diameter d is defined as d = (x + b * cosi / /) The light guide 102 includes an inner side 1〇3, an outer side 104, a base side 1〇5, and an idle edge 106. Since the light guide 102 is formed by rotating a wedge geometry about a central axis, the inner side 103 has a rotationally symmetrical concave shape (truncated cone shape). The inner side and the outer side 103, 1〇4 are tapered from each other in a direction from the base side 1〇5 of the light guide to the idle edge 1〇6, in which the two sides intersect and create an angle α. The idle edge 丨〇 6 defines a illuminating window 107 from which the light is emitted. In the direction from the idle edge i 〇 6 to the base side 105, the outer side 104 is gradually reduced. The outer side 104 of the light guide 1 〇 2 is covered by a mirror 108. The mirror 1 8 can be made of a conventional silver composite. The space surrounded by the inner side 103 and the light-emitting window 1 〇7 is a cavity which is at least partially filled by an optical body 109 having a refractive index lower than one of the inner sides 103 of the light guide 102. Refractive index. In this embodiment, the light source 101 is provided on a phosphor layer 12, which is disposed on the base side 1 〇 5 of the light guide 102. However, it should be noted that the phosphor layer 112 is optional, and the light source 101 can be directly provided on the base side 105. The light source 1 〇1 includes a plurality of lights emitting different colors such as red 131902.doc - 11 - 200918829 , green and blue LED 101. The phosphor layer 112 can comprise, for example, a mixture of YAG:Ce or a plurality of phosphors. With this configuration, the fill layer 112 converts a portion of the light from the blue LED to yellow light. This combination of yellow light and unconverted blue light produces white light. The light guide 102 can be made of polymethyl methacrylate (PMMA), polycarbonate, glass or the like. The light from the source 101 is emitted into the light guide 102 between the inner and outer sides 1 〇 3 ' 1 〇 4 . The light emission in the light guide 1 〇 2 will be reflected on the inner side and the outer sides 103, 104 in turn. By reflection, the angle of incidence of light on the inner side 103 relative to the normal of the inner side 1 3 will eventually be less than the critical angle of total internal reflection 'the light will be coupled out of the inner side 1 〇3. On one of the areas of the inner side 103, the light will be coupled out and then emitted via the light-emitting window 107. Figure 2 shows an angular distribution of the light coupled to an exemplary light output device in accordance with the present invention. In this figure, an angular distribution of a light output device formed by rotating a wedge geometry is shown. The dimensions of the device are length a = 5 mm, length b = 30 mm, distance x = 〇 mm, angle ψ = 35 degrees. In this exemplary embodiment, three LEDs having a size of 1 mm2 are located 2 mm from the central axis and are evenly distributed around the axis. It should be understood that these dimensions and the configuration of the LEDs are merely examples, and the present invention is not limited to this embodiment. The intercept value is determined by the angle ψ in the angular distribution. In Fig. 3, a section of a light guide according to the invention is shown, wherein light is propagated between the inner side 103 and the outer side 1〇4 via the light guide. The light rays propagating in the light guide 102 are shown as a light cone c. The figure shows the change in the region of the cross section of the ray cone by reflection. The cone has rays A1 and B1 on its surface 131902.doc -12· 200918829. The light ray A1 incident on the inner side 103 will be reflected by the inner side and become a light ray A2. The ray A2 will then be reflected by the outer side 104 and become a ray A3. Similarly, the ray B1 incident on the inner side 1 〇 3 will be reflected by the inner side and become B2, which will then be reflected by the outer side 104 and become B3. The distance between the points at which the rays A3 and B3 contact the inner side 103 will be greater than the distance between the points at which the rays A1 and B1 contact the inner side 1〇3. Therefore, after reflection, the area of the cross section of the ray cone will become larger. This means that the rays are incident on a larger area' so that if the rays are coupled out, the perceived brightness will be reduced. In Fig. 4, the light source is mounted to a light source mounting member 110 provided on one of the edges of the base side. The light source mounting member encloses the space surrounded by the base side. The base side 1〇5 of the light guide 102 extends to the central axis of the light guide. Generally, all of the light from the source is coupled into the light guide via the base side. In Fig. 5, the light source is mounted to a light source mounting member 110' which is provided on one of the edges of the bottom side, similar to Fig. 4. The base side 105 of the light guide 1 不 2 does not extend to the central axis. The light output device includes a masking element 111' at its center having a reflective surface. Generally, all of the light from the source is coupled into the light guide via the base side. The shielding element 111 blocks direct light from the light source 1 〇 1 that does not pass between the inner and outer sides 1 〇 3, 1 〇 4 . Therefore, the light from the light source 101 is prevented from being directly emitted via the light-emitting window 107. It should be noted that the screening element n 1 may alternatively have an absorbing surface. 131902.doc -13- 200918829 Figure 6 shows a lighting fixture housing 200' that includes a plurality of light source mounting members and a plurality of light guides 102. The light guide 102 has a concave inner side 1 〇 3 and an outer side 104 which are tapered toward each other. The light guide 1〇2 is configured to light the light over an area of the inner side 103 of the light guide 1〇2 after at least two total internal reflections on the inner side 103 and/or the outer side 1〇4 of the light guide 102 The light guide 102 is coupled out. Any reference number in parentheses in such claims should not be construed as limiting the claim. The use of the verb "comprises," and its singular variations does not exclude the presence of the elements or steps other than the elements or steps recited in the claims. The article ''―" before the element does not exclude the plural. The existence of components. The fact that certain methods are listed in different subsidiary request items does not indicate that one of these methods can be combined to make a profit. BRIEF DESCRIPTION OF THE DRAWINGS FIG. U is a schematic view showing a cross-sectional view of an embodiment of an embodiment of the present invention. The wedge pattern lb of the embodiment shows the rotation of the light guide body according to the present invention; The first wheel according to the present invention "is an angular distribution of the light of the embodiment"; FIG. 3 is a schematic view of the reflection in the light output device according to the present invention; FIG. 4 schematically shows a cross section according to the present invention; Figure 5 of the light in an embodiment of another embodiment of the first output device schematically shows a cross section of another embodiment of the light output skirt according to the invention I31902.doc 14 200918829. Figure 6 is a schematic representation of the invention according to the invention Cross section of one embodiment of the lighting fixture. [Description of main component symbols] 100 light output device 101 light source 101a light source 101b light source 102 light guide 103 inner side 104 outer side 105 base side 106 idle edge 107 light emitting window 108 reflecting surface 109 optical body 110 light source mounting Element 111 shielding element 112 phosphor layer 200 lighting fixture housing a length A1 light A2 light A3 light 131902.doc 15· 200918829 A4 Light A5 Light b Length B1 Light B2 Light B3 Light B4 Light B5 Light C Light cone d Diameter h Total South X Distance Z Axis a Angle Ψ Angle 131902.doc