201144691 六、發明說明： 【發明所屬之技術領域】 尤指一種具有微結 本發明涉及一種能夠照明的器具， 構增亮膜的照明裝置。 【先前技術】201144691 VI. Description of the invention: [Technical field to which the invention pertains] In particular, the invention relates to an illumination device capable of illuminating an illumination device. [Prior Art]
目前-般現有的平面光源’所投射出的光源場形為 Lambert 1 an，即朗伯光源。平面光源所射出的光線的發散 角大，容易造成發光效率不佳以及中心發光強度偏低的缺 點，當應詩照明裝置，例如車尾燈時，需要採用多顆 0LED[有機發光二極體]才能達到法規對於照明亮度的要 求’如此會大幅增加製造成本。 因此，現有技術的使用平面光源的照明裝置存有發光 效率不佳、中心發光強度偏低以及增加製造成本的缺黑:， 實有改善的必要。 【發明内容】 為解決現有技術的使用平面光源的照明裝置有關於發 光效率不纟、中心發光強度偏低以及增加製造成本的不足 與限制’本發明的目的在於提供—種具有微結構增亮膜的 照明裝置’其設有微結構增亮膜’微結構增亮膜的鋸齒狀 的菲涅爾聚光部呈兩次以上的週期性變化，並配合反射體 的設置，能夠有效地將光線聚焦、提昇發光效率、增加中 心發光強度並減少平面光源的0LED使用顆數，進而降低 製造成本，實用性極佳。 本發明所運用的技術手段在於提供一種具有微結構增 201144691 亮膜的照明裝置，包括： 一殼體； 一平面光源’其固設於該殼體内並設有一頂面； 一微結構增亮膜，其固設於該殼體並位於該平面光源 的頂面的上方；該微結構增亮膜為一能夠透光的薄狀片體 並設有一頂部、一底面及一菲淫爾聚光部’該微結構増亮 膜的底面為一平面，該菲涅爾聚光部位於該微結構增亮膜 的頂部，該菲涅爾聚光部設有一中心及一外周緣，該菲涅 爾聚光部於垂直方向的戴面形狀呈鋸齒狀並自該中心開始 朝向該外周緣而呈兩次以上的週期性變化，其中，於第一 次週期的部份形成一第一聚光區，該第一聚光區包括有複 數個圍繞的鑛齒，該複數個鑛齒相互鄰接並以該中心而呈 圍繞分布；於第二次週期的部份形成一第二聚光區，該第 二聚光區圍繞並鄰接於該第一聚光區；該第二聚光區的鋸 齒的排列順序、戴面形狀皆與該第一聚光區相同；以及 一反射體’其固設於該殼體内並圍繞於該平面光源。 所述的具有微結構增亮膜的照明裝置，其中前述的平 面光源設有一中心位置，前述的菲涅爾聚光部的中心與該 平面光源的中心位置對齊，該菲涅_聚光部的最大長度大 於等於該平面光源的最大長度。 所述的具有微結構增亮膜的照明裝置，其中前述的菲 涅爾聚光部自前述的中心開始朝向前述的外周緣而呈三次 的週期性變π，並於第三次週期的部份形成一第三聚光 區。 所述的具有微結構增亮膜的照明裝置，前述的菲；里爾 4 201144691 聚光部於水平方向的截面形狀呈圓形’前述的第一聚光區 為圓形’前述的第二聚光區及前述的第三聚光區是分別為 環形。 所述的具有微結構增亮膜的照明裝置，其中前述的平 面光源為複數個並排的有機發光二極體。 所述的具有微結構增亮膜的照明裝置，其中前述的微 結構增亮膜是設定讓發散角小於等於30度的光線通過。The light source field projected by the current conventional planar light source' is Lambert 1 an, that is, the Lambertian light source. The divergence angle of the light emitted by the planar light source is large, which easily causes the disadvantage of poor luminous efficiency and low central luminous intensity. When the poetry lighting device, such as the taillight, it is necessary to use multiple 0LEDs [organic light-emitting diodes] Meeting regulatory requirements for lighting brightness' will greatly increase manufacturing costs. Therefore, the prior art lighting device using a planar light source has a lack of illuminating efficiency, a low central illuminating intensity, and an increase in manufacturing cost: there is a need for improvement. SUMMARY OF THE INVENTION In order to solve the prior art illumination device using a planar light source, there are disadvantages and limitations regarding luminous efficiency, low central illumination intensity, and increased manufacturing cost. The object of the present invention is to provide a microstructure-enhanced brightness enhancement film. The illuminating device 'its micro-structured brightness enhancement film' has a serrated Fresnel concentrating portion with a periodic variation of more than two times, and with the arrangement of the reflector, can effectively focus the light Improve the luminous efficiency, increase the central luminous intensity and reduce the number of 0LEDs used in the planar light source, thereby reducing the manufacturing cost and providing excellent practicability. The technical means utilized by the present invention is to provide a lighting device having a microstructured increase 201144691 bright film, comprising: a casing; a planar light source 'fixed in the casing and provided with a top surface; a microstructure brightening a film, which is fixed on the casing and located above the top surface of the planar light source; the microstructure brightness enhancement film is a thin film body capable of transmitting light and is provided with a top, a bottom surface and a fluorescing concentrating light The bottom surface of the microstructured bright film is a plane, the Fresnel concentrating portion is located at the top of the microstructure brightness enhancing film, and the Fresnel concentrating portion is provided with a center and an outer circumference, the Fresnel The shape of the concentrating portion in the vertical direction is serrated and periodically changes from the center toward the outer periphery by two or more periodic periods, wherein a first concentrating region is formed in a portion of the first period. The first concentrating zone includes a plurality of surrounding orthodontic teeth, the plurality of ore teeth are adjacent to each other and distributed around the center; and a second concentrating zone is formed in a portion of the second cycle, the second a concentrating zone surrounding and adjacent to the first concentrating zone; Two saw teeth in the order of the converging zone, wearing surface shapes are the same as the first condensing zone; and a reflector 'which is fixed to the housing and surrounding the light source to the plane. The illumination device having a microstructure-enhanced brightness enhancement film, wherein the planar light source is provided with a central position, and a center of the aforementioned Fresnel concentrating portion is aligned with a center position of the planar light source, and the Fresnel concentrating portion The maximum length is greater than or equal to the maximum length of the planar light source. The illuminating device having a microstructure-enhanced brightness enhancing film, wherein the aforementioned Fresnel concentrating portion is periodically changed from the center to the outer periphery by three times, and is periodically changed to π, and is in a portion of the third cycle. A third concentrating zone is formed. The illuminating device having the microstructure-enhanced brightness enhancing film, the aforementioned phenanthrene; the Lille 4 201144691 concentrating portion has a circular cross-sectional shape in the horizontal direction, and the aforementioned first concentrating region is circular. The light zone and the aforementioned third light collecting zone are respectively annular. The illuminating device having a microstructure-enhancing film, wherein the aforementioned planar light source is a plurality of side-by-side organic light-emitting diodes. The illuminating device having a microstructure-enhancing film, wherein the aforementioned microstructure-enhancing film is set to pass light having a divergence angle of 30 degrees or less.
所述的具有微結構增亮膜的照明裝置，其中前述的菲 涅爾聚光部與前述的平面光源的距離範圍為lmm以上以及 1 5 min以下。 所述的具有微結構增亮膜的照明裝置，其中前述的反 射體為四個反射罩，各反射罩設有一反射面’各反射面鄰 近於前述的平面光源且呈凹弧狀。 所述的具有微結構增亮膜的照明裝置，其中前述的菲 涅爾聚光部於水平方向的截面形狀呈正方形，前述的第一 聚光區為正方形。 所述的具有微結構增亮膜的照明裝置，其中前述的菲 淫爾聚光部力水平方向㈣面形狀呈稽圓开》，前述的第一 聚光區為精圓形。 本發明所提供的具有微結構增亮膜的照明裝置，可以 獲得的具體效益及功效增進包括：由於微結構增亮膜的鑛 齒狀的菲淫爾聚光部呈兩次以上的週期性變化，並配合反 射體的設置，㊣夠有效地將光線聚焦、提昇發光效率、增 加中心發光強度並減少平面光源@㈣使用顆數，進而 降低製造成本，實用性極佳。 201144691 【實施方式】 為能詳細瞭解本發明的技術特徵及實用功效，並可依 照說明書的内容來實施，茲進一步以如圖式所示的較佳實 施例，詳細說明如后： 本發明所提供的一種具有微結構增亮獏的照明裝置的 第一較佳實施例，如圖1所示，包括：一殼體1 〇、一平面 光源30、一微結構增亮膜5〇與一反射體70等元件，其中： 如圖1所示’該殼體1 〇呈中空狀’該殼體1 〇為現有 • 技術的構件’且不是本發明的重點，其詳細結構容不贅述。 如圖1、2所示’該平面光源3 0水平固設於該殼體1 〇 内並設有—頂面，較佳地，該平面光源3 0為複數個有機 發光二極體並排而成。 如圖1、2所示’該微結構增亮膜5 0固設於該殼體i 〇 的頂部並位於該平面光源3 0的頂面的上方；該微結構增 梵膜50為一能夠透光的薄狀矩形片體並設有一頂部、— 底面及一菲涅爾聚光部51 ;該微結構增亮膜50的底面為 籲 平面’該菲涅爾聚光部51位於該微結構增亮膜5 〇的頂 部’該菲淫爾聚光部51於水平方向的截面形狀呈圓形， 邊菲淫爾聚光部51於垂直方向的截面形狀呈鋸齒狀並自 圓心開始朝向圓周而呈兩次以上的週期性變化，其中，於 第一次週期的部份形成一圓形的第一聚光區511，該第一 聚光區511包括有複數個鄰接的鋸齒5111，該複數個鋸齒 5111呈環形並以該菲涅爾聚光部51的圓心而呈同心圓分 布’第一聚光區511即為現有技術的菲涅爾透鏡（Fresnel Lens)，其詳細結構容不贅述； 6 201144691 環形的第二聚光區513, 於第二次週期的部份形成一 該第二聚光區513環繞並鄰接於該第—聚光區5" ”玄第 二聚光區513㈣齒5131的排列順序、戴面形狀皆與該 第-聚光^ 511相同’在此容不贅述，並且由於菲涅爾聚 光部51是呈週期性變化，所以第二聚光@ 513的徑向長 度與第-聚光d 511的徑向長度相同；由於平面光源3〇 可視為有許多的點光源集合在一塊，戶斤以藉由複數個[二 個以上]的聚光區，能夠對於不同位置的點光源進行聚光In the above illumination device having a microstructure-enhanced brightness enhancement film, the distance between the aforementioned Fresnel concentrating portion and the aforementioned planar light source is in the range of 1 mm or more and 15 5 or less. The illuminating device with a microstructure-enhancing film, wherein the reflector is four reflectors, and each reflector is provided with a reflecting surface. The reflecting surfaces are adjacent to the planar light source and have a concave arc shape. In the illuminating device having the microstructure-enhanced brightness enhancing film, the cross-sectional shape of the aforementioned Fresnel concentrating portion in the horizontal direction is square, and the first condensing area is square. In the illuminating device having the microstructure-enhanced brightness-enhancing film, the aforementioned phoenix concentrating portion has a horizontal (four) plane shape, and the first condensing area is a perfect circular shape. The specific benefits and enhancements that can be obtained by the illumination device with the microstructure-enhanced film provided by the present invention include: due to the periodic variation of the mineral-like fluorescing concentrating portion of the microstructure-enhanced film And with the setting of the reflector, it is effective to focus the light, improve the luminous efficiency, increase the central luminous intensity and reduce the number of use of the planar light source @(4), thereby reducing the manufacturing cost and the practicality is excellent. [Embodiment] In order to understand the technical features and practical effects of the present invention in detail, and in accordance with the contents of the specification, the following is further described in the preferred embodiments as illustrated in the following: A first preferred embodiment of a lighting device having a microstructure-enhanced brightening device, as shown in FIG. 1, includes a housing 1 , a planar light source 30 , a microstructure enhancing film 5 , and a reflector An element such as 70, wherein: the housing 1 is hollow in a hollow shape as shown in Fig. 1 and the housing 1 is a member of the prior art technology and is not the focus of the present invention, and detailed description thereof will not be repeated. As shown in FIG. 1 and FIG. 2, the planar light source 30 is horizontally fixed in the casing 1 and provided with a top surface. Preferably, the planar light source 30 is a plurality of organic light emitting diodes arranged side by side. . As shown in FIG. 1 and FIG. 2, the microstructure-enhancing film 50 is fixed on the top of the casing i 并 and located above the top surface of the planar light source 30; the microstructure-enhanced van Gogh film 50 is transparent. The thin rectangular piece of light is provided with a top, a bottom surface and a Fresnel concentrating portion 51; the bottom surface of the microstructure brightness enhancing film 50 is a plane of the plane. The Fresnel concentrating portion 51 is located at the microstructure. The top portion of the bright film 5 ' 'the Philippine concentrating portion 51 has a circular cross-sectional shape in the horizontal direction, and the cross-sectional shape of the Philippine concentrating portion 51 in the vertical direction is serrated and starts from the center of the circle toward the circumference. More than two periodic changes, wherein a portion of the first period forms a circular first concentrating region 511, the first concentrating region 511 includes a plurality of adjacent serrations 5111, the plurality of serrations 5111 is annular and is concentrically distributed with the center of the Fresnel concentrating portion 51. The first concentrating region 511 is a Fresnel lens of the prior art, and its detailed structure is not described; 6 201144691 a second second concentrating area 513, forming a second concentrating area 51 in a portion of the second period 3 circumscribing and adjacent to the first concentrating area 5" ” second concentrating area 513 (four) teeth 5131 in the order of arrangement, the shape of the wearing surface is the same as the first concentrating light 511 ′′ is not described here, and because of the Philippine The Neil concentrating portion 51 is periodically changed, so the radial length of the second condensing light @ 513 is the same as the radial length of the first condensing light d 511; since the planar light source 3 〇 can be regarded as having a plurality of point light sources One piece, with a plurality of [two or more] concentrating areas, can collect light for point light sources at different positions.
的動作，換句話說，菲涅爾聚光部51的週期性變化能夠 適用於平面光源30，而達到聚光的目的。 較佳地，该菲涅爾聚光部5丨自圓心開始朝向圓周而 呈二次的週期性變化，並於第三次週期的部份形成—環形 的第二聚光區5丨5，該第三聚光區515的鋸齒5151的排列 順序、截面形狀皆與該第一聚光區511相同； 較佳地’該菲涅爾聚光部51的圓心與該平面光源30 的中心位置對齊； 較佳地’該菲涅爾聚光部51的直徑大於等於該平面 光源30的最大長度’該菲涅爾聚光部51與該平面光源30 的距離範圍為lmm以上以及l5mm以下；藉此，平面光源3〇 的光線大部份能夠射往菲涅爾聚光部51，達到較佳的匯聚 效果。 如圖1、3所示，該反射體7 〇固設於該殼體1 〇内並 圍繞於該平面光源3 〇 ;較佳地，該反射體7 0為四個反射 罩’各反射罩設有一反射面71，各反射面71鄰近於該平 面光源30而呈凹弧狀的拋物線。 201144691The action, in other words, the periodic variation of the Fresnel concentrating portion 51 can be applied to the planar light source 30 to achieve the purpose of collecting light. Preferably, the Fresnel concentrating portion 5 has a secondary periodic change from the center of the circle toward the circumference, and forms a second annular concentrating region 5 丨 5 in a portion of the third period. The arrangement order and the cross-sectional shape of the sawtooth 5151 of the third concentrating area 515 are the same as the first concentrating area 511; preferably, the center of the Fresnel concentrating part 51 is aligned with the center position of the planar light source 30; Preferably, the diameter of the Fresnel concentrating portion 51 is greater than or equal to the maximum length of the planar light source 30. The distance between the Fresnel concentrating portion 51 and the planar light source 30 is in the range of 1 mm or more and 15 mm or less; Most of the light of the planar light source 3 能够 can be incident on the Fresnel concentrating portion 51 to achieve a better convergence effect. As shown in FIG. 1 and FIG. 3, the reflector 7 is fixed in the casing 1 and surrounds the planar light source 3; preferably, the reflector 70 is four reflectors. There is a reflecting surface 71, and each reflecting surface 71 is adjacent to the planar light source 30 and has a concave arc parabola. 201144691
如圖2、3所示，本發明的具有微結構增亮膜的照明裝 置於第一較佳實施例中是為一個車尾燈，平面光源3〇將 光線射出，其中，由於平面光源3〇離微結構增亮膜5〇拫 近，所以平面光源30大部份的光線會射往微結構增亮犋 50 ;並且依據折射與全反射的光學特性，微結構増亮膜3〇 會讓發散角小於或等於一預設角度[在本發明的第一較佳 實施例是設定為30度]内的光線通過，而發散角大於3〇 度的光線將折返回平面光源3〇，[本發明所定義的發散角 如圖2的0 r，也就是菲涅爾聚光部51上任一點的法線與 折射出微結構增亮膜5〇的折射光線的失角，即一般所說 的折射角];發散角大於3〇度的光線經由多次的反射後， 直到光線的入射角小於等於預設的角度内方能射出； 平面光源30其他部份的光線會射往反射體7〇，並利 用凹弧狀的反射面71達成匯聚效果，而朝上方射出； 藉由本發明的微結構增亮膜50及反射體7〇，能使平 面光源30射出光線形成一狹窄的光型[如圖4所示]，符 合車尾燈法規的光型要求。 在此補充說明，配合平面光源3〇的發光面積的大小， 本發明能夠適度調整菲涅爾聚光部51的週期的間距，也 就是聚光1511，513, 515的徑向長度的長短，以達到最佳 聚光效果；舉例來說，如圖2所 來尤b的徑向長度為 D ’平面光源、30與微結構增亮膜5〇的距離為z，平面光源 30通過D/2的法線與聚光區[圖中僅標示於第二聚光區⑴; 邊緣的夾角為Θ ’所以D = 2z*tan 0，盆中，产山 Ύ 在本發明的第 一較佳實施例裡，Θ是介於25度至6〇 又間，而Ζ介於 201144691 1丽至15關之間’而Z愈小則0、d需要設計的愈小；本 發明的菲涅爾聚光區51只要有週期性的變化就可以達到 、D的數值 對平面光源3 0聚光的效果，本發明對於 並不作特定的限制。 在本發明的第一較佳實施例中，是採用13顆紅光 ◦ LED[〇rganic Llght-Emittlng Di〇de]，請進一步參看圖 4,圖4是本發明的光源場型示意圖，橫軸是視角[^⑽丨叩As shown in FIG. 2 and FIG. 3, the illumination device with the microstructure brightness enhancement film of the present invention is a taillight in the first preferred embodiment, and the planar light source 3 〇 emits light, wherein the planar light source 3 is separated. The microstructure-enhancing film 5 is close, so most of the light from the planar light source 30 is directed to the microstructure brightening 犋50; and depending on the optical properties of refraction and total reflection, the microstructure of the bright film 3 〇 will make the divergence angle Light rays less than or equal to a predetermined angle [in the first preferred embodiment of the present invention is set to 30 degrees] pass, and light rays having a divergence angle greater than 3 degrees will be folded back to the planar light source 3〇, [Inventor's Office] The defined divergence angle is 0 r as shown in Fig. 2, that is, the normal line at any point on the Fresnel concentrating portion 51 and the angulated angle of the refracted ray refracting the microstructure-enhancing film 5 ,, that is, the so-called refraction angle] The light having a divergence angle greater than 3 degrees is reflected by the plurality of times until the incident angle of the light is less than or equal to a predetermined angle; the light of other portions of the planar light source 30 is directed to the reflector 7 and utilized The concave curved reflecting surface 71 achieves a converging effect while facing upward Out; microstructured brightness enhancing film by the present invention and a reflector 50 7〇, planar light source 30 can emit light to form a narrow beam pattern [shown in Figure 4], an optical type conforming taillights regulatory requirements. In addition, the present invention can appropriately adjust the pitch of the period of the Fresnel concentrating portion 51, that is, the length of the radial length of the condensing light 1511, 513, 515, in accordance with the size of the light-emitting area of the planar light source 3A. The optimal concentrating effect is achieved; for example, as shown in FIG. 2, the radial length of the b' is a D' planar light source, 30 is at a distance z from the microstructured brightness enhancing film 5, and the planar light source 30 is D/2. Normal and concentrating areas [only indicated in the second concentrating area (1); the angle between the edges is Θ ' so D = 2z*tan 0, in the basin, the hawthorn in the first preferred embodiment of the invention , Θ is between 25 degrees and 6 inches, and Ζ is between 201144691 1 丽 to 15 '' and the smaller the Z is, the smaller the design needs to be 0, d; the Fresnel concentrating area 51 of the present invention The effect of the value of D on the concentrating of the planar light source 30 can be achieved as long as there is a periodic change, and the present invention is not particularly limited. In the first preferred embodiment of the present invention, 13 red ◦ LEDs [〇rganic Llght-Emittlng Di〇de] are used, please refer to FIG. 4 further, FIG. 4 is a schematic diagram of the light source field of the present invention, and the horizontal axis Is the angle of view [^(10)丨叩
angle]，單位為度[Degree]，縱軸是發光強度[Umin〇usAngle], the unit is degree [Degree], and the vertical axis is luminous intensity [Umin〇us
Why]，單位為[cd];虛線為未使用微結構增亮膜5〇 的發光強度分佈，實線為使用微結構增亮$ 5()後的發光 強度分佈；未使用微結構增亮膜5〇的中心發光強度大約 為30.5cd，而使用微結構増亮膜5〇的中心發光強度大約 為67. 6cd，藉此達到聚光效果並符合車尾燈亮度需求。 本發明的具有微結構增亮膜的照明裝置是實施於車尾 燈，而本發明也可以實施於檯燈、車側燈等而達到聚光的 效果’本發明對於實施的領域及用途均不作特定的限制。 如圖5所不’本發明的具有微結構增亮膜的照明裝置 =二較佳實施例是大致與前述的第一較佳實施例相同， 幵；”亥非〉圼爾聚光部51A於水平方向的戴面形狀呈正方 形’違第一聚光區511A為正方形。 =6所示，本發明的具有微結構增亮膜的照明裝置 ==實施例是大致與前述的第一較佳實施例相同， T 垓非涅爾聚光部51B於水+ # & 形，該第-聚光區511B為槽圓形:方向的截面形狀呈㈣ 由第二較佳實施例及第三較佳實施例中，可得知本發 9 201144691 明的菲埋爾聚光部51，51A，51B彳為正方形、矩形、㈣ 形或其他形狀而不限於圓形’本發明對於菲埋爾聚光部 51，51 A，51B的形狀不作特定的限制。 处惟以上所述者，僅為本發明的較佳實施例而已，當不 能以此限定本發明實施的範圍’及大凡依本發明中請專利 範圍及說明書内容所作的簡單的等效變化與修冑，皆應仍 屬本發明專利涵蓋的範圍内。Why], the unit is [cd]; the dotted line is the luminous intensity distribution of the unstructured brightness enhancement film 5〇, and the solid line is the luminous intensity distribution after the microstructure is brightened by $5(); no microstructured brightness enhancement film is used. The center luminescence intensity of the 5 〇 is about 30.5 cd, and the center illuminance of the microstructure 増 bright film 5 〇 is about 67. 6 cd, thereby achieving the concentrating effect and meeting the brightness requirement of the tail lamp. The illuminating device having the microstructure-increasing film of the present invention is implemented in a taillight, and the present invention can also be implemented in a desk lamp, a side lamp, or the like to achieve the effect of concentrating. The present invention is not specific to the field of application and use. limit. The illuminating device having the microstructure-enhanced film of the present invention as shown in FIG. 5 = the second preferred embodiment is substantially the same as the first preferred embodiment described above, 幵; "Hai Fei" 聚 concentrating portion 51A The shape of the wearing surface in the horizontal direction is square. The first concentrating area 511A is square. The illuminating device with the microstructure brightness enhancing film of the present invention == embodiment is substantially the first preferred embodiment described above. For example, the T 垓Nornel concentrating portion 51B is in the shape of water + # & the first concentrating region 511B is a circular groove: the cross-sectional shape of the direction is (4) by the second preferred embodiment and the third preferred In the embodiment, it can be seen that the Philippine concentrating portion 51, 51A, 51B 明 of the present invention is a square, a rectangle, a (four) shape or other shapes and is not limited to a circular shape. The present invention is directed to a Philippine concentrating portion. The shape of the 51, 51 A, 51B is not specifically limited. The above is only the preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto. The simple equivalent changes and repairs made in the scope and contents of the manual should still be Ming encompassed within the scope of the patent.
【圖式簡單說明】 圖1是本發明第一較佳實施例的局部立體剖面示意 圖。 圖2是本發明第一較佳實施例光線射往菲涅爾聚光部 的示意圖。 圖3是本發明第一較佳實施例光線射往反射體的示意 圖。 圖4是本發明第一較佳實施例的局部立體剖面示意 圖。 圖5是本發明第二較佳實施例菲涅爾聚光部的局部立 體剖面示意圖。 圖6是本發明第三較佳實施例菲涅爾聚光部的局部立 體剖面示意圖。 【主要元件符號說明】 10殼體 3 0平面光源 5 0微結構增亮膜 10 201144691 51 51A 5 1B菲涅爾聚光部 511 511A 511B第一聚光區 5111鋸齒 513第二聚光區 5131鋸齒 515第三聚光區 5151鋸齒 70反射體 71反射面 β 1發散角 D聚光區的徑向長度 φ Ζ平面光源與微結構增亮膜的距離BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partial perspective sectional view showing a first preferred embodiment of the present invention. Fig. 2 is a schematic view showing the light incident on the Fresnel concentrating portion in the first preferred embodiment of the present invention. Figure 3 is a schematic illustration of light rays directed at a reflector in accordance with a first preferred embodiment of the present invention. Figure 4 is a partial perspective cross-sectional view showing a first preferred embodiment of the present invention. Figure 5 is a partial perspective cross-sectional view showing a Fresnel concentrating portion in accordance with a second preferred embodiment of the present invention. Fig. 6 is a partial perspective sectional view showing a Fresnel concentrating portion according to a third preferred embodiment of the present invention. [Main component symbol description] 10 housing 30 plane light source 50 microstructure brightness enhancement film 10 201144691 51 51A 5 1B Fresnel concentrating part 511 511A 511B first concentrating area 5111 sawtooth 513 second concentrating area 5131 sawtooth 515 third concentrating area 5151 sawtooth 70 reflector 71 reflecting surface β 1 divergence angle D radial length of concentrating area φ distance of planar light source and microstructure brightness enhancing film