200840975 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，尤其涉及一種採用發光二 極體之照明裝置。 【先前技術】 發光二極體(Light Emitting Diode，LED)，具有環保、 較高之機械可靠性及較長之使用壽命之特點，故，採用led 作為照明裝置之光源為目前之新趨勢。 凊參見圖1 ’所示為一種習知之長條狀led照明裝置 10。該LED照明裝置10包括燈箱11、電路板12、侧光式 LED光源13、反射組件14、LED頂部反射片15及燈蓋16。 該燈箱11為中空長條形框體，其具有一開口 112。該電路 板12亦為長條形，相應設置於該燈箱u之底部。該複數 側光式LED光源13電連接排布於該電路板12之上表面。 5亥反射元件14為小相體結構’其可相應由開口 I〗]散入該 燈相11。该反射元件14具有複數相互連接之側壁142及底 面反射板144，且該侧壁142及底面反射板144均為反射 面。该底面反射板144開没有對應於該複數led光源13 之複數通孔146。該反射組件14位於該複數led光源13 頂部’且該複數LED光源13之出光部分別穿過該複數通 孔146。該複數LED頂部反射片15相應設置於該複數LED 光源13之頂部。該燈盖16可為擴散片或透明板，其封蓋 於a亥燈相11之開口 112處。该複數LED光源13所發出之 光束於該反射元件14之側壁142或底面反射板144反射 6 200840975 後，最終通過燈蓋16出射。 ▲ 惟，上述側光式LED光源13即使與該LED頂部反射 .片15搭配，LED光源13所發射之光束於該反射元件14 及燈蓋16組成之空間内充分混光，相鄰LED光源13之間 仍有較明顯之暗區。也就是說，點光源仍無法有效轉換為 均勻面光源，故，導致LED照明裝置10出射光亮度不均。 綜上所述，上述現象將導致LED照明裝置品質下降。 因此，有必要提供一種可提高出射光亮度均勻性之 LED照明裝置。 【發明内容】 本發明提供一種可提高出光均勻性之LED照明裝置。 一種LED照明裝置，其包括一具有開口之燈箱、一電 路板、至少一 LED光源、一第一反射元件、一第二反射元 件及一燈蓋。該電路板設置於燈箱底部。該至少一 LED光 源電連接設置於該電路板表面。該第一反射元件為一反射 板，其上開設有對應於該LED光源之至少一通孔，該LED 光源相應穿過該通孔。該第二反射元件包括一底板，從該 底板邊緣延伸形成之至少兩相對之侧壁，及至少一與該 LED光源相對應之遮光片，該遮光片從其中一側壁中部延 伸至其相對侧壁中部，該遮光片靠近該兩侧壁處分別設有 複數透光孔，且該底板具有與該遮光片相對應之至少一第 一開口。讓遮光片蓋住相應LED光源。該燈蓋封蓋於該燈 箱開口處。 相對於習知技術，上述LED照明裝置由於該第一反射 7 200840975 元件與第二反射元件構成一光束多重反射空間，位於多重 反射空間内之LED光源之出光部出射之光束經由多次反射 後，光束混合充分，部分光束由複數相鄰遮光片之空隙出 射，部分光束由遮光片之透光孔出射，從而有效降低LED 光源正上方之出射光亮度，最終相鄰兩LED光源之間隙不 致產生暗區。此外，排布於LED光源之兩上侧之複數透光 孔可使該照明裝置之兩長側壁之端部位置之光學亮度將得 到增強，光學均勻性得到提高。 【實施方式】 請同時參見圖2至圖5，本發明較佳實施例一之LED 照明裝置20包括燈箱21、電路板22、複數侧光式LED光 源23、第一反射元件24、第二反射元件25及燈蓋26。 該燈箱21為中空之長條形框體，其具有一開口 212。 該電路板22也為長條形，相應設置於該燈箱21之底部。 該複數側光式LED光源23電連接等間距排布於該電路板 22之上表面。如圖5所示，每個側光式LED光源23包括 一基部231、一設置於該基部231上表面之半導體發光晶 片233及一光學棱鏡235，該光學稜鏡235較該基部231 略小，其設於該基部231上方，且將該半導體發光晶片233 封裝於其内。該基部231之寬度比該光學稜鏡235之寬度 要大。 該第一反射元件24包括一長條形反射底板241，其上 相對於該LED光源23之光學稜鏡235處開設複數與該複 數LED光源23對應之通孔244。該第一反射元件24還可 8 200840975 包括至少兩相對之侧壁242，其從該底板241之兩長側邊 & 延伸形成。該第一反射元件24設於該LED光源23之基部 231上，每個LED光源23之光學稜鏡235穿過相應之通孔 244。 該第二反射元件25包括一底板254及複數從該底板邊 緣延伸形成之相互連接之侧壁252。該底板254及側壁252 組成一小燈箱結構，其可相應由燈箱21之開口 212嵌入該 燈箱21。該第二反射元件25均由高反射率塑膠或具高反 射率表面之金屬材料製成，且該侧壁252及底板254均為 反射面。本實施例中，該第二反射元件25為金屬材料，其 可通過衝壓工藝一體成型製備。該第二反射元件25還包括 複數與該LED光源23相對應之遮光片255。每個遮光片 255從其中一長侧壁252中部延伸至其相對之長側壁252 中部。該遮光片255靠近該兩侧壁252處設有至少一透光 孔257。本實施例中，該遮光片255之透光孔257為複數， 每一側均有兩排規則排列之透光孔257。該底板254具有 複數與該複數遮光片255相對應之第一開口 256。該第二 反射元件25嵌入該燈箱21後，位於該複數LED光源23 及第一反射元件24之上方，且每個LED光源23之光學稜 鏡235穿過相應第一開口 256頂持相應遮光片255。本實 施例中，遮光片255及第一開口 256都為長方形，且遮光 片255之寬度\¥:略小於第一開口 256之寬度W2。 如圖2所示，第二反射元件25之兩長侧壁252於該遮 光片255下方開設複數第二開口 258,該複數第二開口 258 9 200840975 與該底板254之第一開口 256相貫通。如圖5所示，本實 .施例中，該第一反射元件24之兩長側壁242之高度等於光 _學稜鏡235之高度，其可封閉複數第二開口 258。 該燈蓋26可為擴散片或透明板，其封蓋於該燈箱21 之開口 212處，將電路板22、複數侧光式LED光源23、 第一反射元件24及第二反射元件25裝配於該燈箱21内。 其中，該第二反射元件25之側壁252與該燈箱21之侧壁 214可分別設有卡扣結構（圖未示），用於將第二反射元件 25更緊密地固定於該燈箱21内。 如圖5所示，由於該第一反射元件24與第二反射元件 25構成一光束多重反射空間，位於多重反射空間内之LED 光源23之出光部出射之光束經由多次反射後，光束混合充 分，部分光束由複數相鄰遮光片255之空隙出射，部分光 束由遮光片255之透光孔257出射，從而有效降低LED光 源23正上方之出射光亮度，最終相鄰兩LED光源23之間 隙不致產生暗區。此外，排布於LED光源23之兩上侧之 \ 複數透光孔257可使該照明裝置20之兩長侧壁之端部位置 之光學亮度將得到增強，光學均勻性得到提高。 可以理解，第二反射元件25之兩短侧壁252可省略； 第一反射元件24之兩長侧壁242之高度亦可大於光學稜鏡 235之高度，只要第二反射元件25與其相配合即可。進一 步地，第二反射元件25之兩長侧壁252之複數第二開口 258可被省略，同時，該第一反射元件24之兩長侧壁242 亦可被省略。 10 200840975 請參見圖6,本發明較佳實施例二之LED照明裝置30 包括燈箱31、電路板32、複數側光式LED光源33、第一 反射元件34、第二反射元件35及燈蓋36。該LED照明裝 置30與較佳實施例一之LED照明裝置20較相似，只有其 中之第一反射元件34與較佳實施例一之第一反射元件24 不同。該燈箱31、電路板32、側光式LED光源33、第二 反射元件35及燈蓋36之結構及位置可參考第一實施例之 相關描述。 該第一反射元件34與較佳實施例一之反射元件24之 不同在於其為分體式結構。該第一反射元件34包括一反射 底板341及複數側壁343，該底板341及該複數侧壁343 分別為獨立元件。該底板341具有相對應於該複數LED光 源33之複數通孔（未標示）。該底板341設置於該電路板 32表面，該複數LED光源33相應地穿過該底板341之通 孔。該複數側壁343固定於燈箱31之侧壁314内側。該第 一反射元件34與該第二反射元件35構成一出射光束多重 反射空間。本實施例之出射光束多重反射空間同樣可達到 較佳實施例一之出射光束多重反射空間技術效果。 為提高上述較佳實施例之LED照明裝置之光學均勻 性，遮光片之透光孔還可採用如圖7至圖11所示之分佈設 計。 如圖7所示，該遮光片透光孔之設計為：以該遮光片 之中心為圓心，複數均勻之圓形透光孔沿圓心所在之複數 虛設之圓孤上間隔分佈。 11 200840975 如圖8所示，該遮光片透光孔之設計為··以該遮光片 .之中心為圓心，複數之圓形透光孔沿圓心所在之複數虛設 之圓孤上間隔分佈’該複數透光孔離圓心越退’面積越大。 如圖9所示，該遮光片透光孔之設計為：透光孔為長 條狀，複數長條狀透光孔分佈於該遮光片兩侧。 如圖10所示，該遮光片透光孔之設計為：透光孔為長 條狀，複數長條狀透光孔分佈於該遮光片兩侧，且越遠離 該遮光片中心，透光孔越長。 如圖11所示，該遮光片透光孔之設計為：以遮光片之 中心為圓心，複數長條圓弧狀透光孔沿圓心所在之複數虛 設之圓弧上分佈。 綜上所述，本發明確已符合發明專利要件，爰依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施例， 舉凡熟悉本案技藝之人士，於援依本案發明精神所作之等 效修飾或變化，皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 圖1係一種習知LED照明裝置之立體分解示意圖。 圖2係本發明較佳實施例一之L E D照明裝置之立體分 解示意圖。 圖3係圖2所示LED照明裝置去除燈蓋後之俯視圖。 圖4係圖3沿IV-IV線之局部剖面放大示意圖。 圖5係圖3沿V-V線之剖面放大示意圖。 圖6係本發明較佳實施例二之LED照明裝置之剖面示 意圖。 12 200840975 圖7至圖11為本發明LED照明裝置之第一反射元件 ，中遮光片之透光孔分佈俯視圖。 【主要元件符號說明】 LED照明裝置 燈箱 電路板 LED光源 第一反射元件 第二反射元件 燈蓋 開口 基部 半導體發光晶片 光學棱鏡 反射底板 側壁 通孔 底板 遮光片 第一開口 透光孔 第二開口 20 > 30 21、 31 22、 32 23 > 33 24、 34 25、 35 26、 36 212 231 233 235 241 、 341 214、242、252、343 244 254 255 256 257 258 13200840975 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a lighting device, and more particularly to an illumination device using a light-emitting diode. [Prior Art] Light Emitting Diode (LED) has the characteristics of environmental protection, high mechanical reliability and long service life. Therefore, the use of LED as a light source for lighting devices is a new trend. Referring to Figure 1 ', a conventional strip LED lighting device 10 is shown. The LED lighting device 10 includes a light box 11, a circuit board 12, an edge-lit LED light source 13, a reflection assembly 14, an LED top reflection sheet 15, and a lamp cover 16. The light box 11 is a hollow elongated frame having an opening 112. The circuit board 12 is also elongated and correspondingly disposed at the bottom of the light box u. The plurality of edge-lit LED light sources 13 are electrically connected to the upper surface of the circuit board 12. The 5 Hz reflective element 14 is a small phase structure 'which can be diverge into the lamp phase 11 correspondingly by the opening I'. The reflective element 14 has a plurality of interconnected sidewalls 142 and a bottom reflector 144, and the sidewall 142 and the bottom reflector 144 are reflective surfaces. The bottom reflecting plate 144 is open without a plurality of through holes 146 corresponding to the plurality of LED light sources 13. The reflective component 14 is located at the top of the plurality of LED light sources 13 and the light exiting portions of the plurality of LED light sources 13 pass through the plurality of through holes 146, respectively. The plurality of LED top reflective sheets 15 are correspondingly disposed on top of the plurality of LED light sources 13. The lamp cover 16 can be a diffuser or a transparent plate that is capped at the opening 112 of the a-light phase 11. The light beam emitted by the plurality of LED light sources 13 is reflected by the side wall 142 of the reflective element 14 or the bottom reflecting plate 144 6 200840975, and finally exits through the lamp cover 16. ▲ However, even if the edge-lit LED light source 13 is matched with the LED top reflection sheet 15, the light beam emitted by the LED light source 13 is fully mixed in the space formed by the reflective element 14 and the lamp cover 16, and the adjacent LED light source 13 There are still more obvious dark areas between them. That is to say, the point light source still cannot be effectively converted into a uniform surface light source, so that the brightness of the emitted light of the LED illumination device 10 is uneven. In summary, the above phenomenon will lead to a decline in the quality of the LED lighting device. Therefore, it is necessary to provide an LED lighting device which can improve the brightness uniformity of emitted light. SUMMARY OF THE INVENTION The present invention provides an LED lighting device that can improve light uniformity. An LED lighting device includes a light box having an opening, a circuit board, at least one LED light source, a first reflecting element, a second reflecting element and a lamp cover. The board is placed at the bottom of the light box. The at least one LED light source is electrically connected to the surface of the circuit board. The first reflective element is a reflective plate having at least one through hole corresponding to the LED light source, and the LED light source passes through the through hole correspondingly. The second reflective element comprises a bottom plate, at least two opposite side walls extending from an edge of the bottom plate, and at least one light shielding plate corresponding to the LED light source, the light shielding film extending from a middle of one of the side walls to the opposite side wall thereof In the middle portion, the light shielding sheet is respectively provided with a plurality of light transmission holes near the two side walls, and the bottom plate has at least one first opening corresponding to the light shielding sheet. Let the visor cover the corresponding LED light source. The lamp cover is capped at the light box opening. In contrast to the prior art, the LED illumination device forms a beam multiple reflection space by the first reflection 7 200840975 element and the second reflection element, and the light beam emitted from the light exit portion of the LED light source located in the multiple reflection space is reflected by multiple times. The beam is fully mixed, part of the light beam is emitted from the gap of the plurality of adjacent light-shielding films, and part of the light beam is emitted from the light-transmitting hole of the light-shielding film, thereby effectively reducing the brightness of the outgoing light directly above the LED light source, and finally the gap between the adjacent two LED light sources does not cause darkness. Area. In addition, the plurality of light-transmissive holes arranged on the upper two sides of the LED light source can enhance the optical brightness of the end portions of the two long side walls of the illumination device, and the optical uniformity is improved. [Embodiment] Referring to FIG. 2 to FIG. 5 simultaneously, an LED lighting device 20 according to a preferred embodiment of the present invention includes a light box 21, a circuit board 22, a plurality of side-lit LED light sources 23, a first reflective element 24, and a second reflection. Element 25 and lamp cover 26. The light box 21 is a hollow elongated frame having an opening 212. The circuit board 22 is also elongated and correspondingly disposed at the bottom of the light box 21. The plurality of edge-lit LED light sources 23 are electrically connected to the upper surface of the circuit board 22 at equal intervals. As shown in FIG. 5, each of the edge-lit LED light sources 23 includes a base portion 231, a semiconductor light-emitting chip 233 disposed on the upper surface of the base portion 231, and an optical prism 235. The optical port 235 is slightly smaller than the base portion 231. It is disposed above the base 231 and encapsulates the semiconductor light-emitting wafer 233 therein. The width of the base 231 is larger than the width of the optical pickup 235. The first reflective element 24 includes a strip-shaped reflective bottom plate 241 on which a plurality of through holes 244 corresponding to the plurality of LED light sources 23 are formed with respect to the optical port 235 of the LED light source 23. The first reflective element 24 can also include at least two opposing side walls 242 extending from the two long sides & The first reflective element 24 is disposed on the base 231 of the LED light source 23, and the optical 稜鏡235 of each LED light source 23 passes through the corresponding through hole 244. The second reflective element 25 includes a bottom plate 254 and a plurality of interconnecting side walls 252 extending from the edge of the bottom plate. The bottom plate 254 and the side walls 252 form a small light box structure that can be correspondingly embedded in the light box 21 by the opening 212 of the light box 21. The second reflective elements 25 are each made of a high reflectivity plastic or a metal material having a high reflectivity surface, and both the side walls 252 and the bottom plate 254 are reflective surfaces. In this embodiment, the second reflective member 25 is made of a metal material, which can be integrally formed by a stamping process. The second reflective element 25 further includes a plurality of light shielding sheets 255 corresponding to the LED light source 23. Each of the visors 255 extends from a central portion of one of the long side walls 252 to a central portion of the opposite long side walls 252. The light shielding sheet 255 is provided with at least one light transmission hole 257 near the two side walls 252. In this embodiment, the light-shielding holes 257 of the light-shielding sheet 255 are plural, and each side has two rows of regularly arranged light-transmitting holes 257. The bottom plate 254 has a plurality of first openings 256 corresponding to the plurality of light shielding sheets 255. After the second reflective element 25 is embedded in the light box 21, it is located above the plurality of LED light sources 23 and the first reflective element 24, and the optical 稜鏡235 of each LED light source 23 passes through the corresponding first opening 256 to hold the corresponding light shielding film. 255. In this embodiment, the light shielding sheet 255 and the first opening 256 are both rectangular, and the width of the light shielding sheet 255 is slightly smaller than the width W2 of the first opening 256. As shown in FIG. 2, the two long sidewalls 252 of the second reflective element 25 define a plurality of second openings 258 under the opaque sheet 255. The plurality of second openings 258 9 200840975 are connected to the first opening 256 of the bottom plate 254. As shown in Fig. 5, in the embodiment, the height of the two long side walls 242 of the first reflective member 24 is equal to the height of the optical 235, which can enclose the plurality of second openings 258. The lamp cover 26 can be a diffuser or a transparent plate that is capped at the opening 212 of the light box 21, and the circuit board 22, the plurality of side-light LED light sources 23, the first reflective element 24 and the second reflective element 25 are assembled Inside the light box 21. The side wall 252 of the second reflective element 25 and the side wall 214 of the light box 21 can be respectively provided with a snap structure (not shown) for more closely fixing the second reflective element 25 in the light box 21. As shown in FIG. 5, since the first reflective element 24 and the second reflective element 25 form a multiple beam reflection space, the light beam emitted from the light exiting portion of the LED light source 23 located in the multiple reflection space is sufficiently reflected by the light beam. The partial light beam is emitted from the gap of the plurality of adjacent light shielding sheets 255, and part of the light beam is emitted from the light transmission hole 257 of the light shielding sheet 255, thereby effectively reducing the brightness of the outgoing light directly above the LED light source 23, and finally the gap between the adjacent two LED light sources 23 is not caused. Create dark areas. In addition, the plurality of light-transmissive holes 257 disposed on the upper two sides of the LED light source 23 can enhance the optical brightness of the end portions of the two long side walls of the illumination device 20, and the optical uniformity is improved. It can be understood that the two short side walls 252 of the second reflective element 25 can be omitted; the height of the two long side walls 242 of the first reflective element 24 can also be greater than the height of the optical 稜鏡235, as long as the second reflective element 25 is matched thereto. can. Further, the plurality of second openings 258 of the two long side walls 252 of the second reflective element 25 can be omitted, and the two long side walls 242 of the first reflective element 24 can also be omitted. 10 200840975 Referring to FIG. 6, an LED lighting device 30 according to a second embodiment of the present invention includes a light box 31, a circuit board 32, a plurality of side-lit LED light sources 33, a first reflective element 34, a second reflective element 35, and a lamp cover 36. . The LED illumination device 30 is similar to the LED illumination device 20 of the preferred embodiment, except that the first reflective element 34 is different from the first reflective element 24 of the preferred embodiment. The structure and position of the light box 31, the circuit board 32, the sidelight LED light source 33, the second reflective element 35, and the lamp cover 36 can be referred to the related description of the first embodiment. The first reflective element 34 differs from the reflective element 24 of the preferred embodiment in that it is a split structure. The first reflective element 34 includes a reflective bottom plate 341 and a plurality of sidewalls 343. The bottom plate 341 and the plurality of sidewalls 343 are separate components. The bottom plate 341 has a plurality of through holes (not labeled) corresponding to the plurality of LED light sources 33. The bottom plate 341 is disposed on the surface of the circuit board 32, and the plurality of LED light sources 33 respectively pass through the through holes of the bottom plate 341. The plurality of side walls 343 are fixed to the inner side of the side wall 314 of the light box 31. The first reflective element 34 and the second reflective element 35 form an exit beam multiple reflection space. The multiple reflection space of the outgoing beam of the present embodiment can also achieve the technical effect of the multiple reflection space of the outgoing beam of the preferred embodiment 1. In order to improve the optical uniformity of the LED lighting device of the above preferred embodiment, the light-transmitting holes of the light-shielding sheet may also be designed as shown in Figs. 7 to 11 . As shown in Fig. 7, the light-transmissive aperture of the light-shielding sheet is designed such that the center of the light-shielding sheet is centered, and a plurality of uniform circular light-transmissive holes are equally spaced apart along a plurality of dummy circles where the center of the circle is located. 11 200840975 As shown in FIG. 8 , the light-transmitting hole of the light-shielding sheet is designed to have a center of the light-shielding sheet as a center, and a plurality of circular light-transmissive holes are spaced apart at a plurality of circular circles where the center of the circle is located. The multiple light-transmissive holes are more and more retracted from the center of the circle. As shown in FIG. 9, the light-transmitting hole of the light-shielding sheet is designed such that the light-transmitting holes are elongated, and a plurality of long-length light-transmissive holes are distributed on both sides of the light-shielding sheet. As shown in FIG. 10, the light-transmitting hole of the light-shielding sheet is designed such that the light-transmitting hole is elongated, and a plurality of long-shaped light-transmissive holes are distributed on both sides of the light-shielding sheet, and the farther away from the center of the light-shielding sheet, the light-transmitting hole The longer it is. As shown in FIG. 11, the light-transmissive aperture of the light-shielding sheet is designed such that the center of the light-shielding sheet is centered, and the plurality of long-length circular-shaped light-transmissive holes are distributed along a plurality of arcs of a plurality of virtual circles where the center of the circle is located. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above-mentioned embodiments are merely preferred embodiments of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective exploded view of a conventional LED lighting device. Fig. 2 is a perspective exploded view of the L E D illumination device according to a preferred embodiment of the present invention. 3 is a top plan view of the LED lighting device of FIG. 2 with the lamp cover removed. Figure 4 is an enlarged schematic partial cross-sectional view taken along line IV-IV of Figure 3. Figure 5 is an enlarged schematic cross-sectional view taken along line V-V of Figure 3. Figure 6 is a cross-sectional view of an LED lighting device in accordance with a second preferred embodiment of the present invention. 12 200840975 FIG. 7 to FIG. 11 are top views showing the distribution of the light-transmitting holes of the first light-shielding sheet of the first reflecting element of the LED lighting device of the present invention. [Main component symbol description] LED lighting device Light box circuit board LED light source First reflecting element Second reflecting element Lamp cover Opening base Semiconductor light emitting chip Optical prism Reflecting bottom plate Side hole Through hole Base plate First opening light hole Second opening 20 > ; 30 21, 31 22, 32 23 > 33 24, 34 25, 35 26, 36 212 231 233 235 241, 341 214, 242, 252, 343 244 254 255 256 257 258 13