JP2007087658A - Plane lighting device - Google Patents

Plane lighting device Download PDF

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JP2007087658A
JP2007087658A JP2005272583A JP2005272583A JP2007087658A JP 2007087658 A JP2007087658 A JP 2007087658A JP 2005272583 A JP2005272583 A JP 2005272583A JP 2005272583 A JP2005272583 A JP 2005272583A JP 2007087658 A JP2007087658 A JP 2007087658A
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light
light emitting
hollow region
emitting diodes
emitted
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JP4633589B2 (en
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Yoji Kawasaki
要二 川崎
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Toshiba Lighting and Technology Corp
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Harison Toshiba Lighting Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To realize plane lighting using a light-emitting diode with high brightness and a high uniformity ratio as a light source without using a light guide plate. <P>SOLUTION: Light emitted from a plurality of light-emitting diodes 121 to 124 linearly arrayed is emitted to a hollow region 113 formed between a diffusion plate 16 to be a light-emitting face and a reflecting member 15 to be a reflecting face arranged in opposition. Long flat-concave cylindrical lenses 141, 142 to which light emitted from the light-emitting diodes 121 to 124 is converged are arranged in front of an emitting side of the light-emitting diodes 121 to 124. Prisms 14c, 14d refracting toward front or inward a component spread in an outward direction of the hollow region 113 out of emission light of the light-emitting diodes arranged at both sides, in the vicinity of emission-side both ends of the cylindrical lenses 141, 142. With this, reflection loss at side walls of the hollow region 113 in the vicinity of the light-emitting diodes 121 to 124 can be alleviated, and plane lighting with high brightness and a high uniformity ratio can be realized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、発光ダイオードを光源とし、例えば液晶用バックライトとして用いる面照明装置に関する。   The present invention relates to a surface illumination device using a light emitting diode as a light source, for example, as a backlight for liquid crystal.

一般に、液晶用バックライトと開発されている導光板が不要な中空方式の面照明装置は、光源から遠ざかるにつれて、反射による光損失により発光面の輝度が低下する傾向が強く、輝度均斉度を向上させることが困難であった。そのため輝度均斉度を向上させるために、光源からの出射光を発光面に対してできるだけ平行に進行させ、中空領域での反射回数を減らすことが望ましく、光源の前方に長尺凸レンズを配置することによって出射光を集光させ、遠方まで光を導く技術が考えられている。（例えば、特許文献１）
特開平８−１７１８０６号公報 In general, a hollow type surface illumination device that does not require a light guide plate and a backlight for liquid crystal that has been developed tends to decrease the luminance of the light emitting surface due to light loss due to reflection as it moves away from the light source, improving the luminance uniformity It was difficult to do. Therefore, in order to improve the luminance uniformity, it is desirable to make the light emitted from the light source travel as parallel as possible to the light emitting surface, and to reduce the number of reflections in the hollow region, and to place a long convex lens in front of the light source A technique for condensing the emitted light and guiding the light far away is considered. (For example, Patent Document 1)
JP-A-8-171806

上記した特許文献１の技術では、光源の放射光は長尺凸レンズによって中空部の厚さ方向では集光されるが、左右方向は光源自体の放射特性が反映された配光となる。このため、両端の光源付近から放射された光は直ちに中空部を形成する側壁に当たり、それが反射ロスとなって面照明の輝度低下につながるものとなっていた。   In the technique of Patent Document 1 described above, the emitted light of the light source is collected in the thickness direction of the hollow portion by the long convex lens, but the light distribution in which the radiation characteristics of the light source itself is reflected in the left-right direction. For this reason, the light radiated from the vicinity of the light sources at both ends immediately hits the side wall forming the hollow portion, which becomes a reflection loss and leads to a decrease in luminance of the surface illumination.

この発明の目的は、導光板なしに高輝度、高均斉度を実現する面照明装置を提供することにある。   An object of the present invention is to provide a surface illumination device that realizes high luminance and high uniformity without a light guide plate.

上記した課題を解決するために、この発明の面照明装置は、中空領域を隔てて対向配置した発光面および反射面と、前記中空領域に隣接し、中空領域へ出射させるように直線状に配列させた複数の発光ダイオードと、前記発光ダイオードの放射側前方に配置させた長尺の平凸型シリンドリカルレンズと、前記シリンドリカルレンズの出射側両端側に形成され、外側に配置の前記発光ダイオードから放射される光の内、前記中空領域外側方向へ広がる成分を正面あるいは内側に屈折させるプリズムとを具備したことを特徴とする。   In order to solve the above-described problems, a surface illumination device according to the present invention includes a light emitting surface and a reflective surface arranged opposite to each other across a hollow region, and a linear arrangement adjacent to the hollow region so as to be emitted to the hollow region. A plurality of light emitting diodes, a long plano-convex cylindrical lens disposed in front of the light emitting diode on the radiation side, and formed on both ends of the cylindrical lens on the emission side, and radiated from the light emitting diode disposed on the outside And a prism that refracts a component that spreads outward in the hollow region to the front or inside.

また、中空領域を隔てて対向配置した発光面および反射面と、前記中空領域に隣接し、中空領域へ出射させるように直線状に配列させた複数の発光ダイオードと、前記発光ダイオードの放射側前方に配置させた長尺の平凸型シリンドリカルレンズと、前記発光ダイオードが実装される配線基板の裏側に密着させるとともに、前記発光ダイオードおよび前記シリンドリカルレンズとの空間を取り囲む熱伝導性シートとを具備したことを特徴とする。   A light-emitting surface and a reflective surface disposed opposite to each other across a hollow region; a plurality of light-emitting diodes arranged adjacent to the hollow region and linearly arranged to be emitted to the hollow region; A long plano-convex cylindrical lens disposed on the substrate, and a heat conductive sheet that is closely attached to the back side of the wiring board on which the light-emitting diode is mounted and surrounds the space between the light-emitting diode and the cylindrical lens. It is characterized by that.

この発明によれば、光源近傍の中空領域側壁での反射ロスを低減することができ、高輝度かつ高均斉度な面照明を実現することができる。   According to the present invention, it is possible to reduce the reflection loss at the side wall of the hollow region near the light source, and to realize surface illumination with high brightness and high uniformity.

また、レンズで集光できない光がレンズ内に侵入するのを防ぐことで、高輝度かつ高均斉度な面照明を実現することができる。   Further, by preventing light that cannot be collected by the lens from entering the lens, it is possible to realize surface illumination with high brightness and high uniformity.

以下、この発明を実施するための最良の形態について、図面を参照しながら詳細に説明する。   Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

図１は、この発明の一実施形態について説明するための分解斜視図である。図１に示すように、１１は一面が開放された箱型のケースであり、このケース１１の長辺側の対向する内側面１１１，１１２には、それぞれケース１１の中空領域１１３に出射させるため、配線基板１３１，１３２上に直線状に配列して接続された発光ダイオード１２１〜１２４が対向配置して取り付けられる。配線基板１３１，１３２のそれぞれ発光ダイオード１２１〜１２４放射側前方には、例えば材質がアクリルで形成された長尺の平凸型のシリンドリカルレンズ１４１，１４２が配置される。   FIG. 1 is an exploded perspective view for explaining an embodiment of the present invention. As shown in FIG. 1, reference numeral 11 denotes a box-shaped case whose one surface is open. In order to allow the inner side surfaces 111 and 112 facing the long side of the case 11 to be emitted to the hollow region 113 of the case 11, respectively. The light emitting diodes 121 to 124 connected in a straight line on the wiring boards 131 and 132 are attached to face each other. Long plano-convex cylindrical lenses 141 and 142 made of, for example, an acrylic material are disposed in front of the light emitting diodes 121 to 124 on the wiring boards 131 and 132, respectively.

１５はケース１１の底面１１４に設置され、反射面となる反射部材である。反射部材１５は、鏡面反射成分を主とするが部分的に拡散反射成分を混在させてもよい。出射光の輝度バランスを均斉化するために、反射面を傾斜させてもよい。反射部材１５に鏡面反射性を持たせるには、光沢を持ったアルミニウム等の金属で形成したり、それ以外の材質で形成してからアルミニウムや銀等の高反射性金属や高反射性誘電体多層膜を蒸着したり、またそれらの材質からなる光学シートを貼り付けして実現する。同様に、中空領域１１３の側壁１１５，１１６も反射面とする。   Reference numeral 15 denotes a reflecting member that is installed on the bottom surface 114 of the case 11 and serves as a reflecting surface. The reflection member 15 mainly includes a specular reflection component, but a diffuse reflection component may be partially mixed. In order to equalize the luminance balance of the emitted light, the reflecting surface may be inclined. In order to make the reflecting member 15 have specular reflectivity, it is formed of a glossy metal such as aluminum, or formed of other materials and then a highly reflective metal such as aluminum or silver or a highly reflective dielectric. It is realized by depositing a multilayer film or attaching an optical sheet made of these materials. Similarly, the side walls 115 and 116 of the hollow region 113 are also reflecting surfaces.

１６は、例えばアクリル樹脂製で中空領域１１３を介して反射部材１５と対向配置され、全体の配光を整えるための拡散板である。中空領域１３と接する拡散板１６の反対面には、水平や垂直方向に集光させたり均斉化させたりする機能を有する例えばＰＥＴ（Polyethylene Terephthalate）等で形成される拡散シート１７，１８を配置する。拡散シート１８上には、表示窓１９１が形成されたフレーム１９を配置する。なお、拡散板１６、拡散シート１７，１８は発光面を構成する。   Reference numeral 16 denotes a diffusing plate made of, for example, an acrylic resin and disposed so as to face the reflecting member 15 through the hollow region 113 to adjust the entire light distribution. Diffusion sheets 17 and 18 made of, for example, PET (Polyethylene Terephthalate) or the like having a function of condensing and leveling in the horizontal and vertical directions are disposed on the opposite surface of the diffusion plate 16 in contact with the hollow region 13. . On the diffusion sheet 18, a frame 19 in which a display window 191 is formed is disposed. The diffusion plate 16 and the diffusion sheets 17 and 18 constitute a light emitting surface.

ここで、図２を参照して平凸型のシリンドリカルレンズの詳細について説明する。図２（ａ）はシリンドリカルレンズの正面図、（ｂ）は側面図、（ｃ）は（ａ）のｘ−ｘ’断面図である。   Here, the details of the plano-convex cylindrical lens will be described with reference to FIG. 2A is a front view of the cylindrical lens, FIG. 2B is a side view, and FIG. 2C is an x-x ′ sectional view of FIG.

シリンドリカルレンズ１４１（１４２）の断面は略半円状であり、平坦面１４ａを発光ダイオード１２１〜１２４から発光される光の入射側、曲面部１４ｂを出射側とする。曲面部１４ｂの長手方向両端付近にはプリズム１４ｃ，１４ｄが形成されている。プリズム１４ｃ，１４ｄは、長手方向に内方側に垂直部１４ｅを外方側に傾斜部１４ｆを設けて（図５参照）構成される山を複数形成することにより構成される。   The cross section of the cylindrical lens 141 (142) is substantially semicircular, and the flat surface 14a is an incident side of light emitted from the light emitting diodes 121 to 124, and the curved surface portion 14b is an emission side. Prisms 14c and 14d are formed in the vicinity of both ends in the longitudinal direction of the curved surface portion 14b. The prisms 14c and 14d are configured by forming a plurality of peaks formed by providing a vertical portion 14e on the inner side in the longitudinal direction and an inclined portion 14f on the outer side (see FIG. 5).

図３〜図５を参照しながら上記した構成の作用について説明する。まず、図３において、発光ダイオード１２１〜１２４から放射される光は、シリンドリカルレンズ１４１，１４２を用いそれぞれ略並行光に集光させて中空領域１１３に入射する。入射された光は、反射部材１５で反射され拡散板１６に照射する。拡散板１５を介して放射された光は、拡散シート１７，１８を介して集光と均斉度を図って輝度を増加させる。外部からフレーム１９の表示窓１９１を介して所望の輝度と均斉度を持った面照明を目視することができる。   The operation of the above configuration will be described with reference to FIGS. First, in FIG. 3, light emitted from the light emitting diodes 121 to 124 is condensed into substantially parallel light using the cylindrical lenses 141 and 142 and enters the hollow region 113. The incident light is reflected by the reflecting member 15 and irradiates the diffusion plate 16. The light radiated through the diffusion plate 15 increases the brightness by focusing and uniformity through the diffusion sheets 17 and 18. Surface illumination having a desired luminance and uniformity can be viewed from the outside through the display window 191 of the frame 19.

拡散シート１８から出射しようとする光は、表面反射（フレネル反射）によって導光空間である中空領域１１３内に再帰させることができる。このとき、中空領域１１３側の拡散板１６に透明シートを配置した場合、透明シートのフレネル効果により透明シートで反射された光を中空領域１１３に再帰させ、反射部材１５で再反射させることで、更なる均斉度や輝度の向上が期待できる。   The light that is about to be emitted from the diffusion sheet 18 can be recirculated into the hollow region 113 that is the light guide space by surface reflection (Fresnel reflection). At this time, when a transparent sheet is disposed on the diffusion plate 16 on the hollow region 113 side, the light reflected by the transparent sheet due to the Fresnel effect of the transparent sheet is returned to the hollow region 113 and re-reflected by the reflecting member 15. Further improvement in uniformity and brightness can be expected.

ところで、シリンドリカルレンズ１４１，１４２にはプリズム１４ｃ，１４ｄが形成されている。図４に示すように、配線基板１３１，１３２の長手方向の外側に位置しない発光ダイオード１２２，１２３から出射される光は、シリンドリカルレンズ１４１，１４２を通過した後、図中左右同様の角度ａの広がりで中空領域１１３に出射される。配線基板１３１，１３２の長手方向の外側に位置する発光ダイオード１２１，１２４から放射されプリズム１４ｃ，１４ｄを通過した光は、広がりの狭い光路角度ａ’で中空領域１１３に放射される。   Incidentally, prisms 14c and 14d are formed on the cylindrical lenses 141 and 142, respectively. As shown in FIG. 4, the light emitted from the light emitting diodes 122 and 123 not located outside the longitudinal direction of the wiring boards 131 and 132 passes through the cylindrical lenses 141 and 142, and then has the same angle a as the left and right in the figure. It is emitted to the hollow region 113 in a spread. Light emitted from the light emitting diodes 121 and 124 positioned outside the wiring boards 131 and 132 in the longitudinal direction and passed through the prisms 14c and 14d is radiated to the hollow region 113 at a narrow optical path angle a '.

すなわち、図５に示すように、外側に位置する発光ダイオード１２４の光は、図中の左右ともに同じような角度θ１で、シリンドリカルレンズ１４１（１４２）に入射される。シリンドリカルレンズ１４１を通過し、シリンドリカルレンズ１４１から放射される光のうち、図中左側の光は角度θ２で、プリズム１４ｄを通過した光は、角度θ２より正面方向に近い角度θ３で放射される。   That is, as shown in FIG. 5, the light from the light emitting diode 124 located outside is incident on the cylindrical lens 141 (142) at the same angle θ1 on both the left and right sides in the figure. Of the light that passes through the cylindrical lens 141 and is emitted from the cylindrical lens 141, the light on the left side in the figure is emitted at an angle θ2, and the light that has passed through the prism 14d is emitted at an angle θ3 closer to the front direction than the angle θ2.

従って、図４に示すようにシリンドリカルレンズ１４１のプリズム１４ｄを通過した光が、中空領域１１３の側壁１１５，１１６に反射されるまでの距離Ｌを長くすることができ反射ロスを低減することができる。   Therefore, as shown in FIG. 4, the distance L until the light passing through the prism 14d of the cylindrical lens 141 is reflected by the side walls 115 and 116 of the hollow region 113 can be increased, and the reflection loss can be reduced. .

この実施形態では、発光ダイオードから放射される光はシリンドリカルレンズによって中空領域の厚み方向に対して集光され、光源近傍の面照明部から出射してしまう光の量を抑えることができる。   In this embodiment, the light emitted from the light emitting diode is condensed in the thickness direction of the hollow region by the cylindrical lens, and the amount of light emitted from the surface illumination unit near the light source can be suppressed.

図６、図７は、この発明の他の実施形態について説明するためのもので、図６は分解斜視図、図７は図６要部の切欠断面図である。この実施形態では、発光側を除く背面側を、グラファイト製の熱伝導性シート６１により取り囲むように構成したものである。上記した実施形態と同一の構成部分には同一の符号を付してここでは異なる部分について説明する。   6 and 7 are diagrams for explaining another embodiment of the present invention, FIG. 6 is an exploded perspective view, and FIG. 7 is a cutaway sectional view of the main part of FIG. In this embodiment, the back side excluding the light emitting side is configured to be surrounded by a heat conductive sheet 61 made of graphite. The same components as those in the above-described embodiment are denoted by the same reference numerals, and different portions will be described here.

上記した図１〜図５の実施形態では、発光ダイオード１２１〜１２４のそれぞれから広角度に出射された光がシリンドリカルレンズ１４１，１４２に達する前にケース１１で反射し光軸からずれた経路を通過することから、シリンドリカルレンズ１４１，１４２による適切な集光ができず、発光ダイオード１２１〜１２４近傍での輝度ムラにつながる可能性がある。   In the above-described embodiment shown in FIGS. 1 to 5, light emitted from the light emitting diodes 121 to 124 at a wide angle is reflected by the case 11 before reaching the cylindrical lenses 141 and 142 and passes through a path deviated from the optical axis. As a result, appropriate condensing by the cylindrical lenses 141 and 142 cannot be performed, which may lead to luminance unevenness in the vicinity of the light emitting diodes 121 to 124.

そこで、この実施形態では、例えば黒色のグラファイト製の熱伝導性シート６１，６２を、例えばアクリル系などの接着剤やそれらを含有した両面テープによって、発光ダイオード１２１〜１２４が実装された配線基板１３１，１３２の裏側に密着させるとともに、そこから延伸させた熱伝導性シート６１，５２を発光ダイオード１２１〜１２４とシリンドリカルレンズ１４１，１４２間の空間を取り囲むように配置したものである。   Therefore, in this embodiment, the heat conductive sheets 61 and 62 made of black graphite, for example, are bonded to the wiring board 131 on which the light emitting diodes 121 to 124 are mounted using, for example, an acrylic adhesive or a double-sided tape containing them. , 132 are arranged in close contact with each other, and the heat conductive sheets 61, 52 stretched therefrom are arranged so as to surround the space between the light emitting diodes 121-124 and the cylindrical lenses 141, 142.

熱伝導性シート６１，６２は黒色であることから、図７に示すように、発光ダイオード１２１〜１２４から広角度に出射された光ｃを、シリンドリカルレンズ１４１，１４２に届くまでに吸収することができる。これによりシリンドリカルレンズ１４１，１４２で適切に集光できない光がシリンドリカルレンズ１４１，１４２に入射されることを抑えることができる。   Since the heat conductive sheets 61 and 62 are black, as shown in FIG. 7, the light c emitted from the light emitting diodes 121 to 124 at a wide angle can be absorbed before reaching the cylindrical lenses 141 and 142. it can. As a result, it is possible to prevent light that cannot be properly collected by the cylindrical lenses 141 and 142 from being incident on the cylindrical lenses 141 and 142.

熱伝導性シート６１，６２がグラファイト製の場合は、グラファイトが銅やアルミよりも優れた熱拡散性を有する物質であることから、点灯中に発光ダイオード１２１〜１２４から配線基板１３１，１３２を介してグラファイトに伝わった熱を、効果的に拡散させ、発光効率の低下を防ぐこともできる。   When the heat conductive sheets 61 and 62 are made of graphite, the graphite is a substance having thermal diffusibility superior to that of copper or aluminum, so that the light emitting diodes 121 to 124 pass through the wiring boards 131 and 132 during lighting. Thus, the heat transferred to the graphite can be effectively diffused to prevent a decrease in luminous efficiency.

この実施形態では、発光ダイオードから広角度で出射された光がシリンドリカルレンズに入射されることを黒色の熱伝導性シートで抑えて輝度や均斉度の向上を図ることができる。また、発光ダイオードから発生する熱を熱伝導性シートで吸収させ、発光効率の低下を防止することができる。   In this embodiment, it is possible to suppress the light emitted from the light emitting diode at a wide angle from entering the cylindrical lens with the black heat conductive sheet, thereby improving the luminance and the uniformity. In addition, heat generated from the light emitting diode can be absorbed by the heat conductive sheet, and a decrease in light emission efficiency can be prevented.

なお、シリンドリカルレンズ１４１，１４２の近傍まで熱伝導性シート６１，６２を延伸させているが、中空領域１１３の反射部材１５の裏側へさらに延伸させてもよい。それにより、さらに熱拡散効果を向上させることが期待できる。また、図１〜図５の実施形態と同様に、シリンドリカルレンズ１４１，１４２の両側の放射面にプリズム１４ｃ，１４ｄを形成することで、さらなる輝度や均斉度を向上させることが可能となる。   In addition, although the heat conductive sheets 61 and 62 are extended to the vicinity of the cylindrical lenses 141 and 142, they may be further extended to the back side of the reflecting member 15 in the hollow region 113. Thereby, it can be expected to further improve the thermal diffusion effect. Further, as in the embodiment of FIGS. 1 to 5, the prisms 14 c and 14 d are formed on the radiation surfaces on both sides of the cylindrical lenses 141 and 142, so that it is possible to further improve luminance and uniformity.

また、発光ダイオードから広角度で出射された光がシリンドリカルレンズに入射されることを抑えるということであれば、ただ単に熱伝導性シート６１，６２に相当部分を、黒色や暗黒色系の塗装を施すことでも有効である。この場合、塗装するだけの簡単な作業で廉価化を期待できる。   If the light emitted from the light-emitting diode is prevented from being incident on the cylindrical lens, simply apply a black or dark black coating on the heat conductive sheets 61 and 62. It is also effective to apply. In this case, cost reduction can be expected with a simple operation of painting.

この発明の上記した実施形態に限定されるものではない。例えば、発光ダイオード１２は直線状に４個並べた例について説明したが、４個以下であっても以上であっても構わない。また、直線状である必要はなく例えば千鳥状に並べてもよい。要は表示窓１９１の大きさや形状、求める輝度によって適宜な数や配列にすればよい。   The present invention is not limited to the above-described embodiment. For example, although the example in which four light emitting diodes 12 are arranged in a straight line has been described, the number may be four or less or more. Moreover, it does not need to be linear and may be arranged in, for example, a staggered pattern. In short, an appropriate number or arrangement may be used depending on the size and shape of the display window 191 and the required luminance.

また、発光ダイオード１２は中空領域１１３を挟んで対向配置させたが、中空領域１１３に対し一方から出射する構成のものでもよい。また、発光面には拡散板１６を配置し、拡散板１６上には二枚の拡散シートを配置したが、一枚の拡散シートと二枚あるいは一枚のレンズシートを配置してもよい。つまり、拡散シートあるいはレンズシートを組み合わせることで、得ようとする面照明に対応させることが可能となる。   Further, although the light emitting diode 12 is disposed to face the hollow region 113, the light emitting diode 12 may emit light from one side to the hollow region 113. Further, although the diffusion plate 16 is disposed on the light emitting surface and the two diffusion sheets are disposed on the diffusion plate 16, one diffusion sheet and two or one lens sheet may be disposed. That is, by combining a diffusion sheet or a lens sheet, it is possible to cope with the surface illumination to be obtained.

この発明の一実施形態について説明するための分解斜視図。The disassembled perspective view for demonstrating one Embodiment of this invention. 図１要部の（ａ）は正面図、（ｂ）は側面図、（ｃ）は（ａ）のｘ−ｘ’断面図。1A is a front view, FIG. 1B is a side view, and FIG. 1C is an x-x ′ cross-sectional view of FIG. 図１が組み立てられた状態の断面図。Sectional drawing of the state by which FIG. 1 was assembled. 図１の動作について説明するための説明図。Explanatory drawing for demonstrating the operation | movement of FIG. 図４の要部の拡大図。The enlarged view of the principal part of FIG. この発明の他の実施形態について説明するための分解斜視図。The disassembled perspective view for demonstrating other embodiment of this invention. 図６の動作について説明するための一部切欠断面図。FIG. 7 is a partially cutaway cross-sectional view for explaining the operation of FIG. 6.

符号の説明Explanation of symbols

１１ ケース
１１１，１１２ 内側面
１１３ 中空領域
１１４ 底面
１１５，１１６ 側壁
１２１〜１２４ 発光ダイオード
１３１，１３２ 配線基板
１４１，１４２ シリンドリカルレンズ
１４ｃ，１４ｄ プリズム
１４ｅ 垂直部
１４ｆ 傾斜部
１５ 反射部材
１６ 拡散板
１７，１８ 拡散シート
１９ フレーム
１９１ 表示窓
６１，６２ 熱伝導シート 11 Case 111, 112 Inner side surface 113 Hollow region 114 Bottom surface 115, 116 Side wall 121-124 Light emitting diode 131, 132 Wiring board 141, 142 Cylindrical lens 14c, 14d Prism 14e Vertical part 14f Inclined part 15 Reflecting member 16 Diffusers 17, 18 Diffusion sheet 19 Frame 191 Display window 61, 62 Thermal conduction sheet

Claims (3)

中空領域を隔てて対向配置した発光面および反射面と、
前記中空領域に隣接し、中空領域へ出射させるように直線状に配列させた複数の発光ダイオードと、
前記発光ダイオードの放射側前方に配置させた長尺の平凸型シリンドリカルレンズと、
前記シリンドリカルレンズの出射側両端側に形成され、外側に配置の前記発光ダイオードから放射される光の内、前記中空領域外側方向へ広がる成分を正面あるいは内側に屈折させるプリズムとを具備したことを特徴とする面照明装置。 A light emitting surface and a reflective surface arranged opposite to each other across a hollow region;
A plurality of light emitting diodes adjacent to the hollow region and arranged linearly so as to be emitted to the hollow region;
A long plano-convex cylindrical lens disposed in front of the light emitting diode on the radiation side;
A prism that is formed on both ends of the cylindrical lens on the emission side and that refracts light components emitted from the light emitting diodes arranged on the outside toward the outside of the hollow region in the front or inside. A surface illumination device. 中空領域を隔てて対向配置した発光面および反射面と、
前記中空領域に隣接し、中空領域へ出射させるように直線状に配列させた複数の発光ダイオードと、
前記発光ダイオードの放射側前方に配置させた長尺の平凸型シリンドリカルレンズと、
前記発光ダイオードが実装される配線基板の裏側に密着させるとともに、前記発光ダイオードおよび前記シリンドリカルレンズとの空間を取り囲む熱伝導性シートとを具備したことを特徴とする面照明装置。 A light emitting surface and a reflective surface arranged opposite to each other across a hollow region;
A plurality of light emitting diodes adjacent to the hollow region and arranged linearly so as to be emitted to the hollow region;
A long plano-convex cylindrical lens disposed in front of the light emitting diode on the radiation side;
A surface illumination device comprising: a heat conductive sheet that is in close contact with a back side of a wiring board on which the light emitting diode is mounted and surrounds a space between the light emitting diode and the cylindrical lens. 前記シリンドリカルレンズの出射側両端側には、外側に配置の前記発光ダイオードから放射される光の内、前記中空領域外側方向へ広がる成分を正面あるいは内側に屈折させるプリズムを形成したことを特徴とする請求項２記載の面照明装置。   A prism that refracts light components emitted from the light emitting diodes arranged outside to the outside of the hollow region to the front or inside is formed on both ends of the cylindrical lens on the emission side. The surface illumination device according to claim 2.
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008058532A (en) * 2006-08-30 2008-03-13 Shimadzu Corp Display device
JP2008300194A (en) * 2007-05-31 2008-12-11 Harison Toshiba Lighting Corp Hollow type surface lighting device
JP2008300203A (en) * 2007-05-31 2008-12-11 Toshiba Lighting & Technology Corp Luminaire
JP2009187843A (en) * 2008-02-07 2009-08-20 Harison Toshiba Lighting Corp Plane lighting device
JP2009205968A (en) * 2008-02-28 2009-09-10 Harison Toshiba Lighting Corp Plane lighting device
JP2009210954A (en) * 2008-03-06 2009-09-17 Hitachi Displays Ltd Liquid crystal display
JP2012133920A (en) * 2010-12-20 2012-07-12 Enplas Corp Light-emitting device and illumination device
KR101187748B1 (en) * 2011-12-28 2012-10-09 주식회사 세코닉스 Edge type back light unit without light guide plate and display apparatus using the same
JP2012209128A (en) * 2011-03-30 2012-10-25 Citizen Electronics Co Ltd Planar light unit
JP2013187189A (en) * 2012-03-06 2013-09-19 Lg Display Co Ltd Backlight unit and liquid crystal display device using the same
KR101545689B1 (en) 2014-01-02 2015-08-19 (주)유양디앤유 LED Lighting Apparatus
US9435514B2 (en) 2011-09-29 2016-09-06 Enplas Corporation Surface light source device and display device
KR101908001B1 (en) 2016-07-18 2018-10-15 (주) 부성엘이디 Double Side Projected Signboard using Back Light Unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08171806A (en) * 1994-12-20 1996-07-02 Chiyatani Sangyo Kk Surface lighting system
JP2003197020A (en) * 2001-12-27 2003-07-11 Minebea Co Ltd Planar lighting system
JP2005174820A (en) * 2003-12-12 2005-06-30 Advanced Display Inc Planar light source device, and liquid crystal display device using the same
JP2005243267A (en) * 2004-02-24 2005-09-08 Advanced Display Inc Surface light source device and liquid crystal display

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08171806A (en) * 1994-12-20 1996-07-02 Chiyatani Sangyo Kk Surface lighting system
JP2003197020A (en) * 2001-12-27 2003-07-11 Minebea Co Ltd Planar lighting system
JP2005174820A (en) * 2003-12-12 2005-06-30 Advanced Display Inc Planar light source device, and liquid crystal display device using the same
JP2005243267A (en) * 2004-02-24 2005-09-08 Advanced Display Inc Surface light source device and liquid crystal display

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008058532A (en) * 2006-08-30 2008-03-13 Shimadzu Corp Display device
JP2008300194A (en) * 2007-05-31 2008-12-11 Harison Toshiba Lighting Corp Hollow type surface lighting device
JP2008300203A (en) * 2007-05-31 2008-12-11 Toshiba Lighting & Technology Corp Luminaire
JP2009187843A (en) * 2008-02-07 2009-08-20 Harison Toshiba Lighting Corp Plane lighting device
JP2009205968A (en) * 2008-02-28 2009-09-10 Harison Toshiba Lighting Corp Plane lighting device
JP2009210954A (en) * 2008-03-06 2009-09-17 Hitachi Displays Ltd Liquid crystal display
JP2012133920A (en) * 2010-12-20 2012-07-12 Enplas Corp Light-emitting device and illumination device
JP2012209128A (en) * 2011-03-30 2012-10-25 Citizen Electronics Co Ltd Planar light unit
US9435514B2 (en) 2011-09-29 2016-09-06 Enplas Corporation Surface light source device and display device
KR101187748B1 (en) * 2011-12-28 2012-10-09 주식회사 세코닉스 Edge type back light unit without light guide plate and display apparatus using the same
JP2013187189A (en) * 2012-03-06 2013-09-19 Lg Display Co Ltd Backlight unit and liquid crystal display device using the same
KR101545689B1 (en) 2014-01-02 2015-08-19 (주)유양디앤유 LED Lighting Apparatus
KR101908001B1 (en) 2016-07-18 2018-10-15 (주) 부성엘이디 Double Side Projected Signboard using Back Light Unit

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