200933087 九、發明說明： 【發明所屬之技術領域】 * 本發明涉及一種照明裝置，尤係涉及一種利用發光二極 ^ 體等固態發光元件之照明裝置。 【先前技術】 隨著科學技術之發展與進步，發光二極體（Light Emitting Diode，LED)因具光質佳（亦即光源述出之光譜） 及發光效率高等特性而逐漸取代冷陰極螢光燈（Cold Cathode Fluorescent Lamp，CCFL)作為照明裝置之發光元 件，具體可參見Michael S. Shur等人在文獻Proceedings of the IEEE，Vol. 93，No. 10 ( 2005 年 10 月）中發表之 “Solid-State Lighting: Toward Superior Illumination” 一文。 然而，隨著人工照明之普及化，人們越來越重視光對自 然環境、人類身心健康之影響，例如光污染（夜間光害）、 眩光造成人眼之傷害等等。眩光（glare)係指光源對眼睛產 ❿生之刺激，在其他條件相同之情況下，光源越亮，對眼睛所 造成之傷害就越大。 【發明内容】 有鑒於此，有必要提供一種減少對眼睛產生刺激之照明 裝置。 一種照明裝置，包括至少一發光元件以及一導光板，該 導光板包括一入光面以及一出光面，該至少一發光元件與該 入光面相對設置，該導光板上設有多個凹陷，該多個凹陷内 設有螢光物質，該至少一發光元件發出第一波長的光且耦合 200933087 進入該導光板内，進入該導光板内之一部分第一波長的光經 由螢光物質轉換成至少一第二波長的光，該至少一第二波長 •的光與該發光元件發出之第一波長之另一部分光混:形^ . 白光。 一種照明裝置，包括至少一發光元件以及一導光板，該 導光板包括一入光面、一出光面以及與該出光面相對設置之 底面，該至少一發光元件與該入光面相對設置，該出光面上 ❹設有多個凹陷，該底面上形成螢光物質，該至少一發光元件 發出第一波長的光且耦合進入該導光板内，進入該導光板内 之一部分第一波長的光經由螢光物質轉換成至少一第二波 長的光，該至少一第二波長的光與該發光元件發出之第一波 長之另一部分光混合形成白光。 與習知技術相比，上述照明裝置中之導光板上形成螢光 物質’使得該發光元件所發出的光經由螢光物質轉換成至少 一另一波長的光，並最終混合形成白光，以便於在照明領域 φ之應用，且該發光元件所發出的光被該螢光物質吸收並轉換 成不同角度的光出射，並均勻分佈於該導光板之出光面上， 故’可降低由出光面射出的光的輝度，從而降低或消除炫光 現象之出現’並產生柔和舒適之效果，減少對眼睛產生之刺 激。另外，該導光板上之凹陷可減少或避免該發光二極體所 發出的光於該導光板之表面上產生全反射，從而可提高光之 利用率。 【實施方式】 下面參照附圖’結合具體實施例對本發明作進一步描 200933087 述。 圖1為本發明第一較佳實施例之照明裝置10之剖面示 '意圖，該照明裝置10包括一發光元件、一導光板13以及複 ' 數螢光物質15，在本實施例中，該發光元件為一發光二極體 11 ° 該發光二極體11選自發光波長由紫外光（ultraviolet light，UV light) 到藍綠光之各種發光二極體之一種或多 種，其設於該導光板13之側面，並緊鄰該導光板13，相當 ❹於主光源。 該導光板13具有透光之特性，其由透明材料製成，如 石夕膠（silicone )、樹脂（resin )、玻璃（glass )、壓克力（acrylics， 化學名稱為聚甲基丙烯酸曱醋（polymethyl methacrylate， PMMA ))、石英（quartz )、聚碳酸醋（Polycarbonate，PC )、 環氧樹脂（epoxy)、聚乙烯丙烯酸脂（Poly acrylate)等，該 導光板13之光穿透率至少達到70%，折射率為1.4〜1.7。 ❹ 該導光板13為平板狀，其具有一入光面136、一出光面 132以及與該出光面132相對設置之底面137,該入光面136 與該發光二極體11緊鄰，該底面137上設有一反射層131。 該反射層131上鍍有一層高反射率之材料，如油墨、金 屬材料等，該金屬材料可為水銀、金、銘、銅等，以儘量將 射入導光板13内之光反射出該出光面132,從而提高該照明 裝置10之出光效率。本實施例中，該反射層131設於該導 光板13之底面137，當然，該反射層131亦可同時設於該導 光板13正對發光二極體11之側面上。 200933087 該出光面132上間隔設置有複數微小之凹陷133，該等 凹陷133之口徑不大於5mm，每一凹陷133具有至少一傾斜 ‘ 之側面135，該傾斜之侧面135可為光滑平面或光滑曲面， ' 如抛物面等。該等凹陷133可呈長條狀或網點分佈於該出光 面132上。該等凹陷133可破壞導光板13原有之平滑出光 面，可使該發光二極體11發出的光儘量避免於該出光面132 處發生全反射，且順利穿透該出光面132,射出該導光板13。 同時，該等凹陷132可減小射向該出光面132的光的入射 角，使光於出光面132處形成不規則之折射，從而可使射出 該出光面132的光不會集中向著某一特定之方向，以產生均 勻分佈之效果。另外，該等凹陷133之表面還可進一步設為 粗糙，以進一步使光於出光面132處發生不規則之折射。 該出光面132上之凹陷133可採用壓印、微機電（MEMs) 之方法來製作，亦可採用半導體制程來製作，如光刻 (lithography)、姓刻（etching)等，還可採用模具一體成型 ❿之方法來製作，如射出成形（injection molding )等。 該螢光物質15設於該導光板13之出光面132上之凹陷 133内，該螢光物質15相當於次光源，該螢光物質15與發 光二極體11之組合可選自：黃色螢光物質與藍光二極體， 紅、綠色螢光物質與藍光二極體，以及紅、綠、藍色螢光物 質與紫外光二極體。該螢光物質15被發光二極體11所發出 之一部分光所激發並轉換成不同角度出射的光，該螢光物質 15射出的光的波長大於發光二極體11所發出的光的波長， 該螢光物質15射出的光與該發光二極體11所發出之另一部 200933087 分光混合形成一白光。組成該螢光物質15之材質可為硫化 物（suinde )、銘酸鹽（aluminate )、氧化物（oxide )、石夕酸 鹽（silicate)、氮化物（nitride)等。 ‘ 將該螢光物質15填設於該出光面132上之凹陷133内 時，該螢光物質15可先混合於液態之膠體中，如樹脂、環 氧樹脂、矽膠等類似之熱固型聚合物或紫外線固化之聚合物 中，並將此混合物塗布或平鋪於該導光板13之表面上，填 _充所有之凹陷133，再利用加熱或照射紫外光將其固化。該 螢光物質15藉由與膠體混合，可避免螢光物質15直接與外 界空氣接觸，防止螢光物質15吸收外界空氣中之水分而變 質，且可簡化填充之制程。 上述照明裝置10工作時，該發光二極體11發出之光由 該入光面136耦合進入該導光板13内，其中一部分光直接 射向該導光板13之出光面132，另一部分光則經由該導光板 13之反射層131反射後射向該出光面132。射向該出光面132 ©之一部分光射向該出光面132之無凹陷之部分，並經由該出 光面132之折射直接射出該導光板13 ;射向該出光面132 之又一部分光則經由該出光面132上之凹陷133，且於凹陷 133之傾斜之侧面135處發生折射，激發凹陷133内之螢光 物質15發出不同角度出射的光，射出該導光板13;射向該 出光面132之再一部分光則經由該出光面132與該反射層 131之一次或多次反射，最終激發該出光面132上之凹陷133 内之螢光物質15，由不同之角度射出該導光板13。 上述照明裝置10中，該發光二極體11設於該導光板13 11 200933087 之入光面133 —側，該螢光物質15設於該導光板13之出光 面132上，即發光二極體11與螢光物質15之相對分離設置， 可防止螢光物質15受熱，有利於降低螢光物質15之環境溫 _ 度，從而提高照明裝置10之壽命及其光轉換效率。另外， 該導光板13之出光面132上之凹陷133可減少或避免該發 光二極體11所發出之光於出光面132上產生全反射，從而 提高光之利用率。其次，該螢光物質15分佈於該出光面132 •上之凹陷133内，使得該發光二極體11所發出的光經過該 導光板13時激發螢光物質15發出不同角度出射的光，並由 該導光板13之出光面132射出，從而使光均勻地分佈於該 出光面132上，即將輝度極強之發光二極體11所發出的光 均勻地分散至一較大面積之出光面132上，從而降低或消除 炫光現象之出現，並產生柔和舒適之效果，減少對眼睛產生 之刺激。再者，該螢光物質15吸收該發光二極體11所發出 之一部分光並轉換成波長較長的光，該螢光物質15射出的 ©光與該發光二極體11所發出之另一部分光混合形成一白 光，以便於在照明領域之應用。 當然，該發光二極體11所設位置不僅僅局限於該導光 板13之側面，如圖2所示之本發明第二實施例中之照明裝 置20，該發光二極體21設於該導光板23内，該發光二極體 21被該導光板23包覆，且與螢光物質15間隔一段距離，該 導光板23與該發光二極體21相對之部分為入光面236。 另外，上述凹陷133之設置還可為其他形式，如以下實 施例。 12 200933087 如圖3所示之本發明第三較佳實施例之照明裝置30,其 中該導光板33之出光面332上之凹陷333彼此緊鄰。該照 明裝置30中光之傳出方式與第一較佳實施例中基本相同。 ' 如圖4所示之本發明第四較佳實施例之照明裝置40,其 中該導光板43之出光面432上之凹陷.433之口徑與深度不 同，越遠離發光二極體11，凹陷433之口徑越大，深度越深， 發光二極體11發出之光經由導光板43射向出光面432遠離 ❹發光二極體11之部分，由於此處之凹陷433之口徑更大、 深度更深，從而可使光均勻地分佈於導光板43之出光面432 上。該照明裝置40中光之傳出方式與第一較佳實施例中基 本相同。 如圖5所示為本發明第五較佳實施例之照明裝置50,其 中所述凹陷533分佈於該導光板53之底面537上。工作時， 該發光二極體11發出之光由該入光面136耦合進入該導光 板53内，其中一部分光直接射向該導光板53之出光面132; ❹另一部分光則射向該導光板53之底面537,經由該底面537 上之凹陷533,且於凹陷533之傾斜之側面135處發生折射， 激發凹陷533内之螢光物質15發出不同角度出射的光，該 螢光物質15發出之一部分光直接射向該出光面132,該螢光 物質15發出之另一部分光則射向該反射層131並被該反射 層131反射射向該出光面132。射向該出光面132之一部分 光經由該出光面132之折射直接射出該導光板53;射向該出 光面132之另一部分光則經由該出光面132之反射射向該底 面537,激發該底面537上之凹陷533内之螢光物質15發出 13 200933087 不同角度出射的光，並最終經由該出光面132與反射層131 之一次或多次反射與折射，由不同之角度射出該導光板53。 如圖6所示為本發明第六較佳實施例之照明裝置60,該 ‘ 照明裝置60為第四較佳實施例之照明裝置40與第五較佳實 施例之照明裝置50之結合，即所述凹.陷633同時分佈於該 導光板63之出光面632與底面637上。該照明裝置60中光 之傳出方式請參照第一與第五較佳實施例。 ^ 再者，上述螢光物質15之設置還可為其他形式，如以 下實施例。 圖7所示為本發明第七較佳實施例之照明裝置70,該照 明裝置70與第一較佳實施例之照明裝置10之不同之處在 於：該螢光物質75呈網點分佈於該導光板73之底面737上， 即夾設於該導光板73之底面737與該反射層131之間，而 並非設於該出光面732上之凹陷133内。該發光二極體11 發出的光射向該底面737上之螢光物質75,並激發該螢光物 ©質75發出不同角度出射的光，並於該凹陷133處發生折射， 最終射出該導光板73之出光面732。該螢光物質75可採用 壓印等印刷方式分佈於該導光板73之底面737上。 圖8所示為本發明第八較佳實施例之照明裝置80,該照 明裝置80在第七較佳實施例之基礎上，將該螢光物質85同 時填充於該導光板83之出光面832上之凹陷833内。 圖9所示為本發明第九較佳實施例之照明裝置90,該照 明裝置90包括一導光板93、複數發光二極體91以及與該等 發光二極體91分別對應之複數光耦合元件97。 14 200933087 該導光板93與第一較佳實施例中之導光板13所用材料 相同。該導光板93具有一入光面931以及與該入光面931 相對設置之一出光面932，該出光面932上設有複數彼此相 • 互緊鄰之凹陷933，所述凹陷933内設有螢光物質95，該螢 光物質95被發光二極體91所發出之一部分光激發並發出不 同角度出射的光，該螢光物質95射出的光的波長大於發光 二極體91所發出的光的波長，該螢光物質95射出的光與該 發光二極體91所發出之另一部分光混合形成一白光。該螢 光物質95與第一較佳實施例中所述之螢光物質15相同。 該等光耦合元件97均成錐台形，其具有位於頂端之一 耦合入光面971、位於底端之一耦合出光面972以及將耦合 入光面971與耦合出光面972連接之一傾斜之侧面973，該 耦合入光面971、耦合出光面972分別與發光二極體91、導 光板93之入光面931緊鄰，該傾斜之側面973可為光滑平 面或光滑曲面，如拋物面等。該等光耦合元件97具有透光 ❹之特性，組成該等光耦合元件97之材料與組成該導光板93 之材料基本相同，如矽膠等，該等光耦合元件97之光穿透 率至少達到70%，折射率為1.4〜1.7。 該照明裝置90工作時，該等發光二極體91發出光並由 光耦合元件97之耦合入光面971分別進入該光耦合元件97 内，並於光耦合元件97之傾斜之侧面973處發生全反射， 由耦合出光面972射出該光耦合元件97,射出該光耦合元件 97之光由該導光板93之入光面931進入該導光板93内，並 射向該導光板93之出光面932,射向該出光面932的光則經 15 200933087 由該出光面932上之凹陷933，且於凹陷933之傾斜之侧面 935處發生折射，被凹陷933内之螢光物質95吸收並轉換成 不同角度出射的光射出該導光板93。 * 當然，該等光耦合元件97可與該導光板93分離設置， 亦可與該導光板93 —體成型。該光耦合元件97之傾斜之側 面973還可鍍上反射率高之材料，以防止光由該傾斜之侧面 973茂漏出。 康 上述照明裝置 10、20、30、40、50、60、70、80、90 〇 應用廣泛，既可用於車内照明、船艙内照明，亦可用於室内 照明，如桌燈、天花板燈中，還可用於看板或顯示器之背光 源。 綜上所述，本發明確已符合發明專利之要件，遂依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施方式， 自不能以此限制本案之申請專利範圍。舉凡熟悉本案技藝之 人士援依本發明之精神所作之等效修飾或變化，皆應涵蓋於 ©以下申請專利範圍内。 【圖式簡單說明】 圖1為本發明第一較佳實施例之照明裝置之剖面示意 圖。 圖2為本發明第二較佳實施例之照明裝置之剖面示意 圖。 圖3為本發明第三較佳實施例之照明裝置之剖面示意 圖。 圖4為本發明第四較佳實施例之照明裝置之剖面示意 16 200933087 圖。 圖5為本發明第五較佳實施例之照明裝置之剖面示意 圖。 ‘ 圖6為本發明第六較佳實施例之照明裝置之剖面示意 圖。 圖7為本發明第七較佳實施例之照明裝置之剖面示意 圖。 ^ 圖8為本發明第八較佳實施例之照明裝置之剖面示意 ❹ 圖。 圖9為本發明第九較佳實施例之照明裝置之剖面示意 圖。 【主要元件符號說明】 照明裝置 10 ' 20 ' 30、40 ' 50、 60 、 70 、 80、90 發光二極體 11 、 21 、 91 導光板 13 、 23 、 33 、 43 、 53 、 63 、 73 、 83 ' 93 ©反射層 131 出光面 132 、 332 、 432 、 632 、 732 、 832 、932 凹陷 133 ' 333 、 433 ' 533 、 633 、 833 ' 933 側面 135 、 935 、 973 入光面 136 、 236 ' 931 底面 137 、 537 、 637 、 737 螢光物質 15、75 ' 85、95 光柄合元件 97 耦合入光面 971 耦合出光面 972 17200933087 IX. Description of the Invention: [Technical Field] The present invention relates to an illumination device, and more particularly to an illumination device using a solid-state light-emitting element such as a light-emitting diode. [Prior Art] With the development and advancement of science and technology, Light Emitting Diode (LED) has gradually replaced cold cathode fluorescent light due to its excellent light quality (that is, the spectrum of the light source) and high luminous efficiency. A lamp (Cold Cathode Fluorescent Lamp, CCFL) is used as a light-emitting element of a lighting device. For details, see Michael S. Shur et al., Proceedings of the IEEE, Vol. 93, No. 10 (October 2005). -State Lighting: Toward Superior Illumination" article. However, with the popularization of artificial lighting, people are paying more and more attention to the impact of light on the natural environment and human health, such as light pollution (light damage at night), glare caused by human eyes and so on. Glare refers to the irritating effect of the light source on the eye. Under other conditions, the brighter the light source, the greater the damage to the eye. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide an illumination device that reduces irritation to the eyes. An illumination device includes at least one light-emitting component and a light-guiding plate, the light-guiding plate includes a light-incident surface and a light-emitting surface, and the at least one light-emitting component is disposed opposite to the light-incident surface, and the light guide plate is provided with a plurality of recesses. A fluorescent substance is disposed in the plurality of recesses, and the at least one light emitting element emits light of a first wavelength and is coupled into the light guide plate by coupling 200933087, and a portion of the first wavelength of light entering the light guide plate is converted into at least a fluorescent substance by the fluorescent substance. a second wavelength of light, the at least one second wavelength of light is mixed with another portion of the first wavelength emitted by the illuminating element: a shape of white light. An illumination device includes at least one light-emitting component and a light guide plate, the light guide plate includes a light-incident surface, a light-emitting surface, and a bottom surface opposite to the light-emitting surface, the at least one light-emitting element is disposed opposite to the light-incident surface, a plurality of recesses are formed on the light-emitting surface, the phosphor material is formed on the bottom surface, the at least one light-emitting element emits light of a first wavelength and is coupled into the light guide plate, and a portion of the light of the first wavelength entering the light guide plate is passed through The phosphor material is converted into light of at least a second wavelength, and the light of the at least one second wavelength is mixed with another portion of the first wavelength emitted by the light emitting element to form white light. Compared with the prior art, the phosphor material is formed on the light guide plate in the illumination device, so that the light emitted by the light-emitting element is converted into light of at least another wavelength via the fluorescent substance, and finally mixed to form white light, so as to facilitate In the field of illumination φ, the light emitted by the illuminating element is absorbed by the luminescent material and converted into light of different angles, and is evenly distributed on the light emitting surface of the light guide plate, so that the light emitted from the illuminating surface can be reduced. The brightness of the light, thereby reducing or eliminating the appearance of glare - and producing a soft and comfortable effect, reducing the irritation to the eyes. In addition, the recess on the light guide plate can reduce or avoid the total reflection of the light emitted by the light-emitting diode on the surface of the light guide plate, thereby improving the utilization of light. [Embodiment] Hereinafter, the present invention will be further described with reference to the accompanying drawings in conjunction with the specific embodiments. 1 is a schematic cross-sectional view of a lighting device 10 according to a first preferred embodiment of the present invention. The lighting device 10 includes a light-emitting element, a light guide plate 13 and a plurality of fluorescent substances 15. In this embodiment, The light-emitting element is a light-emitting diode 11 °. The light-emitting diode 11 is selected from one or more of various light-emitting diodes having an ultraviolet light wavelength (UV light) to a blue-green light. The side of the light plate 13 is adjacent to the light guide plate 13, which is equivalent to the main light source. The light guide plate 13 has the property of transmitting light, and is made of a transparent material, such as silicone, resin, glass, acrylic, chemical name polymethacrylic acid vinegar (polymethyl methacrylate, PMMA), quartz, polycarbonate, PC, epoxy, poly acrylate, etc., the light transmittance of the light guide plate 13 is at least 70%, the refractive index is 1.4 to 1.7. The light guide plate 13 has a flat plate shape, and has a light incident surface 136, a light emitting surface 132, and a bottom surface 137 disposed opposite to the light emitting surface 132. The light incident surface 136 is adjacent to the light emitting diode 11 and the bottom surface 137. A reflective layer 131 is disposed thereon. The reflective layer 131 is plated with a high reflectivity material, such as ink, metal material, etc., and the metal material may be mercury, gold, gold, copper, etc., to reflect light incident into the light guide plate 13 as much as possible. Face 132, thereby increasing the light extraction efficiency of the illumination device 10. In this embodiment, the reflective layer 131 is disposed on the bottom surface 137 of the light guide plate 13. Of course, the reflective layer 131 can also be disposed on the side of the light guide plate 13 facing the light emitting diode 11. 200933087 The light-emitting surface 132 is spaced apart from the plurality of tiny recesses 133. The recesses 133 have a diameter of no more than 5 mm, and each recess 133 has at least one inclined side 135. The inclined side 135 can be a smooth plane or a smooth surface. , 'As parabolic etc. The depressions 133 may be distributed in strips or dots on the light exit surface 132. The recesses 133 can break the original smooth light-emitting surface of the light guide plate 13 and prevent the light emitted from the light-emitting diode 11 from being totally reflected at the light-emitting surface 132, and smoothly penetrate the light-emitting surface 132 to emit the light. Light guide plate 13. At the same time, the recesses 132 can reduce the incident angle of the light that is incident on the light-emitting surface 132, so that the light forms irregular refraction at the light-emitting surface 132, so that the light emitted from the light-emitting surface 132 is not concentrated toward a certain Specific direction to produce an even distribution effect. In addition, the surface of the depressions 133 may be further roughened to further cause irregular refracting of the light at the light exit surface 132. The recesses 133 on the light-emitting surface 132 can be fabricated by using embossing, micro-electromechanical (MEMs) methods, or by semiconductor processes, such as lithography, etching, etc. It is produced by a method of forming a crucible, such as injection molding. The phosphor 15 is disposed in a recess 133 on the light-emitting surface 132 of the light guide plate 13. The phosphor 15 is equivalent to a secondary light source. The combination of the phosphor 15 and the LED 11 can be selected from the group consisting of: Light and blue diodes, red and green phosphors and blue LEDs, and red, green, and blue phosphors and ultraviolet diodes. The fluorescent substance 15 is excited by a part of the light emitted by the light-emitting diode 11 and converted into light emitted from different angles. The wavelength of the light emitted by the fluorescent substance 15 is greater than the wavelength of the light emitted by the light-emitting diode 11 . The light emitted from the phosphor 15 is combined with the other portion of 200933087 emitted by the LED 11 to form a white light. The material constituting the fluorescent material 15 may be a sulfide (suinde), an aluminate, an oxide, a silicate, a nitride or the like. When the fluorescent substance 15 is filled in the recess 133 on the light-emitting surface 132, the fluorescent substance 15 may be first mixed in a liquid colloid such as resin, epoxy resin, silicone or the like, and thermosetting polymerization. In the ultraviolet curable polymer, the mixture is coated or tiled on the surface of the light guide plate 13, filled with all the recesses 133, and then cured by heating or irradiating ultraviolet light. By mixing with the colloid, the phosphor 15 prevents the phosphor 15 from directly contacting the outside air, prevents the phosphor 15 from absorbing moisture in the outside air, and simplifies the filling process. When the illuminating device 10 is in operation, the light emitted by the illuminating diode 11 is coupled into the light guiding plate 13 by the light incident surface 136, and a part of the light is directly incident on the light emitting surface 132 of the light guiding plate 13, and another part of the light passes through the light illuminating surface 132. The reflective layer 131 of the light guide plate 13 is reflected and incident on the light exit surface 132. a portion of the light that is directed toward the light-emitting surface 132 is incident on the portion of the light-emitting surface 132 that is not recessed, and is directly emitted from the light-emitting surface 132 by the refraction of the light-emitting surface 132; a portion of the light that is incident on the light-emitting surface 132 passes through the light-emitting portion The recess 133 on the surface 132 is refracted at the inclined side surface 135 of the recess 133, and the fluorescent material 15 in the excitation recess 133 emits light emitted from different angles to be emitted from the light guide plate 13; A part of the light is reflected by the light-emitting surface 132 and the reflective layer 131 one or more times, and finally the phosphor 15 in the recess 133 on the light-emitting surface 132 is excited, and the light guide plate 13 is emitted from different angles. In the illuminating device 10, the light-emitting diode 11 is disposed on the light-emitting surface 133 of the light-guiding plate 13 11 200933087, and the fluorescent material 15 is disposed on the light-emitting surface 132 of the light guide plate 13, that is, the light-emitting diode. The relative separation from the fluorescent substance 15 prevents the fluorescent substance 15 from being heated, which is advantageous for reducing the ambient temperature of the fluorescent substance 15, thereby improving the life of the illumination device 10 and its light conversion efficiency. In addition, the recess 133 on the light-emitting surface 132 of the light guide plate 13 can reduce or avoid the total reflection of the light emitted by the light-emitting diode 11 on the light-emitting surface 132, thereby improving the utilization of light. Next, the phosphor material 15 is distributed in the recess 133 of the light-emitting surface 132, so that the light emitted by the light-emitting diode 11 passes through the light guide plate 13 to excite the fluorescent material 15 to emit light at different angles, and The light-emitting surface 132 of the light guide plate 13 is emitted, so that the light is evenly distributed on the light-emitting surface 132, that is, the light emitted by the bright-emitting light-emitting diode 11 is uniformly dispersed to a large-area light-emitting surface 132. On, thereby reducing or eliminating the appearance of glare, and producing a soft and comfortable effect, reducing the irritation to the eyes. Further, the fluorescent substance 15 absorbs a part of the light emitted by the light-emitting diode 11 and converts it into light having a longer wavelength, and the © light emitted from the fluorescent substance 15 and another part emitted by the light-emitting diode 11 The light mixes to form a white light for use in the field of illumination. Of course, the position of the light-emitting diode 11 is not limited to the side of the light guide plate 13, as shown in FIG. 2, the illumination device 20 of the second embodiment of the present invention, the light-emitting diode 21 is disposed on the guide In the light panel 23, the light-emitting diode 21 is covered by the light guide plate 23 and spaced apart from the phosphor material 15. The portion of the light guide plate 23 opposite to the light-emitting diode 21 is the light-incident surface 236. Further, the above-described arrangement of the recesses 133 may be in other forms as in the following embodiments. 12 200933087 The illuminating device 30 of the third preferred embodiment of the present invention, as shown in FIG. 3, wherein the recesses 333 on the light-emitting surface 332 of the light guide plate 33 are adjacent to each other. The way in which the light is transmitted from the illumination device 30 is substantially the same as in the first preferred embodiment. As shown in FIG. 4, the illumination device 40 of the fourth preferred embodiment of the present invention, wherein the aperture 433 of the light-emitting surface 432 of the light guide plate 43 has a different diameter and depth, and the farther away from the light-emitting diode 11, the recess 433 The larger the aperture is, the deeper the depth is, and the light emitted by the LED 11 is directed toward the light-emitting surface 432 via the light guide plate 43 away from the portion of the light-emitting diode 11, since the recess 433 has a larger diameter and a deeper depth. Thereby, the light can be uniformly distributed on the light-emitting surface 432 of the light guide plate 43. The mode of light transmission in the illumination device 40 is substantially the same as in the first preferred embodiment. As shown in FIG. 5, the illuminating device 50 of the fifth preferred embodiment of the present invention is characterized in that the recess 533 is distributed on the bottom surface 537 of the light guide plate 53. In operation, the light emitted by the LED 11 is coupled into the light guide plate 53 by the light incident surface 136, and a part of the light is directly incident on the light exit surface 132 of the light guide plate 53; and another portion of the light is incident on the light guide plate. The bottom surface 537 of the 53 is refracted through the recess 533 on the bottom surface 537, and is refracted at the inclined side 135 of the recess 533. The phosphor 15 in the excitation recess 533 emits light emitted from different angles, and the fluorescent substance 15 emits A part of the light is directly incident on the light-emitting surface 132, and another part of the light emitted by the fluorescent material 15 is incident on the reflective layer 131 and reflected by the reflective layer 131 to the light-emitting surface 132. A portion of the light that is incident on the light-emitting surface 132 is directly emitted from the light-emitting surface 132 through the light-receiving surface 132; and another portion of the light that is incident on the light-emitting surface 132 is reflected toward the bottom surface 537 via the light-emitting surface 132, thereby exciting the bottom surface 537. The phosphor 15 in the upper recess 533 emits light of 13 200933087 at different angles, and finally reflects and refracts one or more times through the light-emitting surface 132 and the reflective layer 131, and the light guide plate 53 is emitted from different angles. FIG. 6 shows a lighting device 60 according to a sixth preferred embodiment of the present invention. The lighting device 60 is a combination of the lighting device 40 of the fourth preferred embodiment and the lighting device 50 of the fifth preferred embodiment. The recesses 633 are simultaneously distributed on the light exit surface 632 and the bottom surface 637 of the light guide plate 63. For the light transmission mode of the illumination device 60, please refer to the first and fifth preferred embodiments. Further, the arrangement of the above-described fluorescent substance 15 may be in other forms as in the following embodiments. FIG. 7 shows a lighting device 70 according to a seventh preferred embodiment of the present invention. The lighting device 70 is different from the lighting device 10 of the first preferred embodiment in that the phosphor material 75 is distributed at the mesh point. The bottom surface 737 of the light plate 73 is interposed between the bottom surface 737 of the light guide plate 73 and the reflective layer 131, and is not disposed in the recess 133 of the light exit surface 732. The light emitted by the LED 11 is directed to the phosphor 75 on the bottom surface 737, and the phosphor 75 is excited to emit light at different angles, and is refracted at the recess 133 to finally emit the guide. Light exit surface 732 of light panel 73. The phosphor material 75 can be distributed on the bottom surface 737 of the light guide plate 73 by printing or the like. FIG. 8 is a illuminating device 80 according to an eighth preferred embodiment of the present invention. The illuminating device 80 simultaneously fills the illuminating surface 832 of the light guide plate 83 on the light-emitting surface 832 of the light guide plate 83 on the basis of the seventh preferred embodiment. Inside the depression 833. FIG. 9 shows a illuminating device 90 according to a ninth preferred embodiment of the present invention. The illuminating device 90 includes a light guide plate 93, a plurality of light emitting diodes 91, and a plurality of optical coupling elements corresponding to the light emitting diodes 91, respectively. 97. 14 200933087 The light guide plate 93 is the same material as that used in the light guide plate 13 of the first preferred embodiment. The light guide plate 93 has a light-incident surface 931 and a light-emitting surface 932 disposed opposite to the light-incident surface 931. The light-emitting surface 932 is provided with a plurality of recesses 933 adjacent to each other, and the recess 933 is provided with a firefly. The light substance 95 is excited by a portion of the light emitted by the light-emitting diode 91 and emits light emitted from different angles. The light emitted from the fluorescent material 95 has a wavelength greater than that of the light emitted from the LED 91. At the wavelength, the light emitted from the fluorescent substance 95 is mixed with another part of the light emitted from the light-emitting diode 91 to form a white light. This fluorescent substance 95 is the same as the fluorescent substance 15 described in the first preferred embodiment. The light-coupled elements 97 are each in the shape of a truncated cone having a side coupled to the light surface 971 at one of the top ends, a light-emitting surface 972 at the bottom end, and a side inclined to be coupled to the light-emitting surface 972 and the coupled light-emitting surface 972. 973, the coupled light incident surface 971 and the coupled light output surface 972 are respectively adjacent to the light-emitting diode 91 and the light-incident surface 931 of the light guide plate 93. The inclined side surface 973 can be a smooth plane or a smooth curved surface, such as a paraboloid. The optical coupling elements 97 have the characteristics of transmitting light, and the materials constituting the optical coupling elements 97 are substantially the same as the materials constituting the light guiding plate 93, such as silicone or the like, and the light transmittance of the optical coupling elements 97 is at least 70%, the refractive index is 1.4 to 1.7. When the illuminating device 90 is in operation, the illuminating diodes 91 emit light and are respectively coupled into the optical coupling element 97 by the coupling light 971 of the optical coupling element 97, and occur at the inclined side 973 of the optical coupling element 97. Total reflection, the light-coupled element 97 is emitted from the light-emitting surface 972, and light emitted from the light-coupled element 97 enters the light guide plate 93 through the light-incident surface 931 of the light guide plate 93, and is incident on the light-emitting surface of the light guide plate 93. 932, the light that is incident on the light-emitting surface 932 is refracted by the recess 933 on the light-emitting surface 932 through 15 200933087, and is refracted at the inclined side 935 of the recess 933, and is absorbed by the fluorescent substance 95 in the recess 933 and converted into different The light emitted from the angle is emitted from the light guide plate 93. * Of course, the optical coupling elements 97 may be disposed separately from the light guide plate 93 or may be integrally formed with the light guide plate 93. The inclined side surface 973 of the optical coupling element 97 can also be plated with a material having a high reflectance to prevent light from leaking from the inclined side surface 973. The above-mentioned lighting devices 10, 20, 30, 40, 50, 60, 70, 80, 90 〇 are widely used, and can be used for interior lighting, interior lighting, indoor lighting, such as table lamps, ceiling lamps, and Can be used as a backlight for kanban or display. In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application in this case. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a lighting device according to a first preferred embodiment of the present invention. Figure 2 is a schematic cross-sectional view showing a lighting device in accordance with a second preferred embodiment of the present invention. Figure 3 is a cross-sectional view showing a lighting device in accordance with a third preferred embodiment of the present invention. Figure 4 is a cross-sectional view of a lighting device in accordance with a fourth preferred embodiment of the present invention. Figure 5 is a cross-sectional view showing a lighting device in accordance with a fifth preferred embodiment of the present invention. Figure 6 is a schematic cross-sectional view showing a lighting device in accordance with a sixth preferred embodiment of the present invention. Figure 7 is a cross-sectional view showing a lighting device in accordance with a seventh preferred embodiment of the present invention. Figure 8 is a cross-sectional view of a lighting device in accordance with an eighth preferred embodiment of the present invention. Figure 9 is a cross-sectional view showing a lighting device in accordance with a ninth preferred embodiment of the present invention. [Description of main component symbols] Illumination device 10 ' 20 ' 30, 40 ' 50, 60, 70, 80, 90 Light-emitting diodes 11, 21, 91 Light guide plates 13, 23, 33, 43 , 53 , 63 , 73 , 83 ' 93 © reflective layer 131 light-emitting surface 132, 332, 432, 632, 732, 832, 932 recess 133 ' 333 , 433 ' 533 , 633 , 833 ' 933 side 135 , 935 , 973 light-incident surface 136 , 236 ' 931 The bottom surface 137, 537, 637, 737 phosphor material 15, 75 '85, 95 light handle unit 97 is coupled into the light surface 971 to couple the light surface 972 17