JP2006278309A - Lighting system - Google Patents

Lighting system Download PDF

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Publication number
JP2006278309A
JP2006278309A JP2005187749A JP2005187749A JP2006278309A JP 2006278309 A JP2006278309 A JP 2006278309A JP 2005187749 A JP2005187749 A JP 2005187749A JP 2005187749 A JP2005187749 A JP 2005187749A JP 2006278309 A JP2006278309 A JP 2006278309A
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light
light emitting
luminance
emitting element
substrate
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Iwatomo Moriyama
厳與 森山
Kozo Ogawa
光三 小川
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Toshiba Lighting and Technology Corp
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Toshiba Lighting and Technology Corp
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805Shape
    • H01L2224/4809Loop shape
    • H01L2224/48091Arched

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system which can be used for lighting by reducing brightness variations in a light radiation surface. <P>SOLUTION: The lighting system of claim 1 is composed of a substrate 2; an insulator 4 provided on the substrate, circuit patterns 5a and 5b provided on the substrate through the insulator; a plurality of light emitting elements 6 arranged in a matrix shape through the circuit patterns; a reflection body 9 provided on the substrate and reflecting light radiated from the plurality of the light emitting elements; a phosphor layer 12 converting light from the light emitting element; and a dimming body 23 provided with a radiation surface radiating light incident from the light emitting element, a periphery region projecting a part of light traveling toward a part of the radiation surface opposite to each light emitting element from a periphery region not opposite to the light emitting element out side of a opposing part, and a constitution such that a ratio of a minimum brightness to a maximum brightness is 0.01 or more and 1 or less. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、発光素子を光源とする照明装置に関する。   The present invention relates to a lighting device using a light emitting element as a light source.

従来、発光素子として例えば固体発光素子である発光ダイオードを光源とする発光装置では、基板に発光ダイオードを実装するとともにこの発光ダイオードから発光した光を制光するレンズを配置している。このようなレンズの前面側には光軸方向へ向かって発光ダイオードの光が出射する平面状の出射面が形成され、背面側には発光ダイオードから側方へ向かう光を光軸方向に平行に反射させて出射面の周辺部域から出射させる反射面が形成されている。   2. Description of the Related Art Conventionally, in a light emitting device using a light emitting diode as a light source as a light emitting element, for example, a light emitting diode is mounted on a substrate and a lens for controlling light emitted from the light emitting diode is disposed. On the front side of such a lens, a planar emission surface from which light from the light emitting diode is emitted toward the optical axis direction is formed, and light directed from the light emitting diode to the side is parallel to the optical axis direction on the back side. A reflection surface is formed that is reflected and emitted from the peripheral area of the emission surface.

そして、発光ダイオードから放射される光のうち、出射面の発光ダイオードに対向する対向部域へ向かう光が全透過して出射し、反射面へ向かう光が出射面の周辺部域から出射する(例えば、特許文献1参照。)。
特開2001−237463号公報(第4−5頁、図1−3)
And among the light radiated from the light emitting diode, the light directed to the opposed area opposite to the light emitting diode on the emission surface is totally transmitted and emitted, and the light directed to the reflection surface is emitted from the peripheral area of the emission surface ( For example, see Patent Document 1.)
JP 2001-237463 A (page 4-5, FIG. 1-3)

そうすると、発光ダイオードに正対する出射面である対向部域の輝度が高く、この出射面の対向部域へ向かう光は全透過して出射されるため、対向部域の輝度が周辺部域よりも高くなり、出射面の対向部域とその周縁部域とで輝度むらが生じる問題がある。   As a result, the brightness of the facing area, which is the exit surface facing the light emitting diode, is high, and the light toward the facing area of the exit surface is totally transmitted and emitted, so the brightness of the facing area is higher than that of the peripheral area. There is a problem that the brightness becomes uneven in the opposed area of the exit surface and the peripheral area.

本発明は、出射面の輝度むらを低減して照明用として使用し得る照明装置を提供することを目的とする。   An object of this invention is to provide the illuminating device which can be used for illumination, reducing the brightness nonuniformity of an output surface.

請求項1に記載の発明は、基板と;基板に配設された絶縁体と;絶縁体を介して前記基板に配設された回路パターンと;回路パターンを介してマトリクス状に配置される複数の発光素子と;前記基板に配設され、前記複数の発光素子から放射される光を反射する反射体と;前記発光素子からの光を変換する蛍光体層と;前記各発光素子から入射した光を出射する出射面を有し、出射面のうち各発光素子に対向する対向部域へ向かう光の一部をその対向部域より外側で各発光素子に対向しない周辺部域から出射させる周辺部域を有し、最高輝度と最低輝度の比率が0.01以上1未満となるように構成されている制光体と;を具備することを特徴とする。   The invention described in claim 1 includes: a substrate; an insulator disposed on the substrate; a circuit pattern disposed on the substrate via the insulator; and a plurality of elements disposed in a matrix via the circuit pattern. A light-emitting element; a reflector disposed on the substrate and reflecting light emitted from the plurality of light-emitting elements; a phosphor layer converting light from the light-emitting element; and incident from each of the light-emitting elements A periphery having an emission surface for emitting light, and a portion of the emission surface that is directed to a facing area that faces each light emitting element, and is emitted from a peripheral area that does not face each light emitting element outside the facing area. And a light control body configured to have a ratio between a maximum luminance and a minimum luminance of 0.01 or more and less than 1.

基板の材料は、ガラスエポキシ樹脂、アルミニウムまたは窒化アルミニウム等であるが、アルミニウムを含む基板は放熱性がよく、発光素子の温度上昇を抑制して、発光効率低下や素子劣化を抑制する。絶縁体は、基板の材料として金属材料を選択した場合に必要だが、ガラスエポキシ樹脂基板の場合には必要ない。回路パターンは、銅パターンで形成され正極と負極との間に複数の発光素子としての例えば発光ダイオードが電気的にされる。また、発光素子は、前記基板上にマトリクス状に複数配設されて面光源を形成する。反射体は、白色樹脂により形成され、発光素子の周囲を取り囲むように反射面を有している。   The material of the substrate is glass epoxy resin, aluminum, aluminum nitride, or the like, but a substrate containing aluminum has good heat dissipation and suppresses a temperature increase of the light emitting element, thereby suppressing a decrease in luminous efficiency and element deterioration. The insulator is necessary when a metal material is selected as the material of the substrate, but is not necessary in the case of a glass epoxy resin substrate. The circuit pattern is formed of a copper pattern, and, for example, light emitting diodes as a plurality of light emitting elements are electrically connected between the positive electrode and the negative electrode. A plurality of light emitting elements are arranged in a matrix on the substrate to form a surface light source. The reflector is formed of a white resin and has a reflecting surface so as to surround the periphery of the light emitting element.

発光素子の放射光は当該反射面により反射される。蛍光体層は、蛍光体をシリコーン樹脂等に混入させたものであり、発光素子からの光によって可視光に変換する。また、発光素子を拡散材で覆い、この拡散材上に蛍光体層を配設する構成であってもよい。この構成は、当該拡散材により蛍光体層から放射される光を拡散し、制光体の対向部域の輝度が高くなるのを抑制し、周辺部域の輝度との輝度比を1に近づけさせるように作用する。   The emitted light of the light emitting element is reflected by the reflecting surface. The phosphor layer is obtained by mixing a phosphor into a silicone resin or the like, and converts it into visible light by light from the light emitting element. Alternatively, the light emitting element may be covered with a diffusing material, and a phosphor layer may be disposed on the diffusing material. This configuration diffuses the light emitted from the phosphor layer by the diffusing material, suppresses the increase in the brightness of the opposed area of the light control body, and brings the brightness ratio with the brightness of the peripheral area close to 1. It works to let you.

制光体は、アクリル樹脂等によって成形され、各発光素子毎に光学設計されている。対向部域は、発光素子に正対する領域を主にいい、周辺部域は対向部域の周囲に存在し対向部域の輝度に対して低い輝度となる部分をいう。最高輝度と最低輝度の比率は、0.01以上1未満となるように構成されている。当該輝度比が0.01未満のときには、既存施設用の照明装置における輝度比よりも悪化するため、照明装置として実用し得ない。当該輝度比が1のときには、制光体の拡散性を大きくする必要があるが、反面、発光素子からの光の透過率が低下するので、器具効率が悪化するので、照明装置として実用し得ない。   The light control body is formed of an acrylic resin or the like, and is optically designed for each light emitting element. The opposed area mainly refers to an area facing the light emitting element, and the peripheral area is a portion that exists around the opposed area and has a lower luminance than the luminance of the opposed area. The ratio between the highest luminance and the lowest luminance is configured to be 0.01 or more and less than 1. When the luminance ratio is less than 0.01, it becomes worse than the luminance ratio in the lighting device for existing facilities, and thus cannot be put into practical use as a lighting device. When the luminance ratio is 1, it is necessary to increase the diffusibility of the light control body, but on the other hand, the transmittance of light from the light emitting element is lowered, so that the efficiency of the appliance is deteriorated, so that it can be put into practical use as a lighting device. Absent.

請求項2に記載の発明は、請求項1記載の照明装置において、制光体は、発光素子から側方へ向かう光を出射面の対向部域より外側の周辺部域へ向けて反射させる主反射面を有することを特徴とする。   According to a second aspect of the present invention, in the illumination device according to the first aspect, the light control body reflects the light directed laterally from the light emitting element toward the peripheral region outside the opposed region of the emission surface. It has a reflective surface.

主反射面は、対向部域へ放射される光の一部を周辺部域へ反射し、その分、対向部域の輝度を低下させるとともに周辺部域の輝度を上昇させる。   The main reflecting surface reflects a part of the light radiated to the opposing area to the peripheral area, and accordingly reduces the luminance of the opposing area and increases the luminance of the peripheral area.

請求項3に記載の発明は、請求項2記載の照明装置において、出射面の制光部には、発光素子の光軸を中心として出射面より窪む窪み部が形成され、この窪み部には対向部域から光を出射させる環状の出射面部と周辺部域へ光を反射させる環状の反射面部とが光軸を中心として交互に形成され、出射面部の面積が窪み部の中心に近付くほど小さく設けられたことを特徴とする。   According to a third aspect of the present invention, in the illuminating device according to the second aspect, the light control portion of the emission surface is formed with a depression that is recessed from the emission surface around the optical axis of the light emitting element. The ring-shaped exit surface part that emits light from the opposed area and the annular reflection surface part that reflects light to the peripheral area are alternately formed around the optical axis, and the area of the exit surface part approaches the center of the recessed part. It is characterized by being small.

請求項4に記載の発明は、マトリクス状に配置される複数の発光素子により所定の平均輝度となるように構成された照明装置において、上記各発光素子の輝度と周辺部の輝度の輝度比が0.01以上1未満となるように構成されていることを特徴とする。   According to a fourth aspect of the present invention, in a lighting device configured to have a predetermined average luminance by a plurality of light emitting elements arranged in a matrix, a luminance ratio between the luminance of each of the light emitting elements and the luminance of the peripheral portion is set. It is characterized by being configured to be 0.01 or more and less than 1.

照明装置は、例えば、取付け高さh=1800mm(照明装置の設置高さから被験者の目の高さまでの距離)に設置された場合において、発光素子の輝度Lpと周辺部の輝度Lbの比Lb/Lpを輝度比と定義する。なお、Lb=50cd/m2(平方メートル)である。被験者の視線の位置は照明装置の中心(直視)と照明装置の下方10°(周辺視)の2種類行っている。   For example, when the illumination device is installed at a mounting height h = 1800 mm (distance from the installation height of the illumination device to the eye height of the subject), the ratio Lb between the luminance Lp of the light emitting element and the luminance Lb of the peripheral portion. / Lp is defined as the luminance ratio. Note that Lb = 50 cd / m @ 2 (square meter). There are two types of visual line positions of the subject: the center of the lighting device (direct view) and 10 ° below the lighting device (periphery).

上記条件の下で被験者が照明装置を見た場合、「まぶしさが気になり始める」から「不快だと感じ始める」という不快グレア評価をするときの照明装置の平均輝度(照明装置全体の平均的な輝度、BCD平均輝度という。)を算出し、前記輝度比とBCD平均輝度の関係を求め、図7に示した。   When the subject looks at the lighting device under the above conditions, the average luminance of the lighting device when performing an unpleasant glare evaluation from “being worried about glare” to “beginning to feel uncomfortable” (average of the entire lighting device) FIG. 7 shows the relationship between the luminance ratio and the BCD average luminance.

図7は、横軸に輝度比を対数logで表わし、縦軸にBCD平均輝度比を対数logで表している。この結果、輝度比が増加すると当該平均輝度が増加し、不快グレアが軽減されることが分かる。また、照明装置が7000〜10000cd/m2(平方メートル)以上のBCD平均輝度を有するものである場合においては、前記輝度比が0.01からまぶしさが気にならなくなることを知見したものである。   In FIG. 7, the horizontal axis represents the luminance ratio in logarithmic log, and the vertical axis represents the BCD average luminance ratio in logarithmic log. As a result, it can be seen that when the luminance ratio increases, the average luminance increases and unpleasant glare is reduced. In addition, when the lighting device has a BCD average luminance of 7000 to 10000 cd / m 2 (square meter) or more, the luminance ratio is 0.01, and it has been found that the glare does not matter.

請求項1ないし3記載の照明装置によれば、制光体の出射面のうち発光素子に対向する対向部域へ向かう光の一部をその対向部域より外側の周辺部域から出射させるため、出射面の輝度むらを低減できる。   According to the illuminating device according to any one of claims 1 to 3, in order to emit a part of the light directed to the opposed area facing the light emitting element, from the peripheral area outside the opposed area, of the emission surface of the light control body. The brightness unevenness on the exit surface can be reduced.

請求項4の照明装置によれば、上記各発光素子の輝度と周辺部の輝度の輝度比が0.01以上1未満となるように構成されているので、輝度むらやグレアを感じ難くなる。   According to the illumination device of the fourth aspect, since the luminance ratio between the luminance of each of the light emitting elements and the luminance of the peripheral portion is 0.01 or more and less than 1, it is difficult to sense luminance unevenness and glare.

以下、本発明の一実施の形態を図面を参照して説明する。図1は本発明の一実施形態に係る照明装置の平面図、図2は図1のII−II線断面図、図3は図2のIII部拡大図である。図に示すように照明装置1は基板2上に、複数の発光装置3,3・・・を例えば3行3列のマトリクス状に配設し、かつ一体に連成している。基板2は放熱性と剛性を有するアルミニウム(Al)やNi、ガラスエポキシ等の平板からなり、この基板2上には、電気絶縁体4を介してリードフレーム5が配設されている。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a lighting device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. As shown in the figure, the lighting device 1 has a plurality of light emitting devices 3, 3... Arranged on a substrate 2 in a matrix of, for example, 3 rows and 3 columns, and are integrally connected. The substrate 2 is made of a flat plate made of aluminum (Al), Ni, glass epoxy or the like having heat dissipation and rigidity, and a lead frame 5 is disposed on the substrate 2 via an electrical insulator 4.

図3に示すようにリードフレーム5は、LED装置3毎にCuとNiの合金やAu等により、陰極側と陽極側の回路パターン(配線パターン)5a,5bを形成しており、このリードフレーム5上には、発光装置3毎に、発光素子としての青色発光LEDチップ6をそれぞれ搭載している。各青色発光LEDチップ6は、青色の光を発光する例えば窒化ガリウム(GaN)系半導体等からなる。各青色発光LEDチップ6は、その底面電極を回路パターン5a,5bの一方上に載置して電気的に接続する一方、上面電極を回路パターン5a,5bの他方にボンディングワイヤ7により接続している。   As shown in FIG. 3, the lead frame 5 has cathode and anode circuit patterns (wiring patterns) 5a and 5b formed of an alloy of Cu and Ni, Au, or the like for each LED device 3, and this lead frame. 5, a blue light emitting LED chip 6 as a light emitting element is mounted for each light emitting device 3. Each blue light emitting LED chip 6 is made of, for example, a gallium nitride (GaN) semiconductor that emits blue light. Each blue light emitting LED chip 6 has its bottom electrode placed on one of the circuit patterns 5a and 5b to be electrically connected, while its top electrode is connected to the other of the circuit patterns 5a and 5b by a bonding wire 7. Yes.

そして、基板2上には、各青色発光LEDチップ6の周囲を所要の間隔を置いて取り囲み、基板2の反対側(図2,図3では上方)に向けて漸次拡開する反射面を構成する円錐台状の凹部8をそれぞれ同心状に形成した反射体9をLED装置3毎に形成すると共に、これらを一体に形成している。反射体9は例えばPBT(ポリブチレンテレフタレート)やPPA(ポリフタルアミド)、PC(ポリカーボネート)等の合成樹脂よりなり、各凹部8は外部に開口する開口8aをそれぞれ有する。   And on the board | substrate 2, the circumference | surroundings of each blue light emission LED chip 6 are surrounded at a required space | interval, and the reflective surface which spreads gradually toward the other side (FIG. 2, FIG. 3 upper direction) of the board | substrate 2 is comprised. Each of the LED devices 3 is formed with a reflector 9 having conical conical recesses 8 formed concentrically, and these are integrally formed. The reflector 9 is made of, for example, a synthetic resin such as PBT (polybutylene terephthalate), PPA (polyphthalamide), PC (polycarbonate), and each recess 8 has an opening 8a that opens to the outside.

各凹部8は、その内部に、透光性を有するシリコーンゴムやエポキシ樹脂等の熱硬化性透明樹脂を封止樹脂10としてそれぞれ充填している。この封止樹脂10は、青色発光LEDチップ6側の拡散層11と、凹部開口8a側の蛍光体層としての黄色発光蛍光体層12の2層に形成されている。   Each recess 8 is filled with a thermosetting transparent resin such as translucent silicone rubber or epoxy resin as a sealing resin 10. The sealing resin 10 is formed in two layers: a diffusion layer 11 on the blue light emitting LED chip 6 side and a yellow light emitting phosphor layer 12 as a phosphor layer on the concave opening 8a side.

拡散層11は、凹部8内に、アルミナ(Al)やTi、Ca、Si、Al、Y等の拡散剤を3〜5質量%(mass%)添加した封止樹脂を、青色発光LEDチップ6よりも高い位置まで注入して熱硬化させることにより形成され、蛍光体層12との境界面11aを青色発光LEDチップ6側(図3では下面側)へ凹む湾曲面に形成している。この湾曲境界面11aは、その湾曲上端と同下端との間が例えば1μm〜5μmが好ましい。 The diffusion layer 11 is a blue light emitting sealing resin obtained by adding 3 to 5 mass% (mass%) of a diffusing agent such as alumina (Al 2 O 3 ), Ti, Ca, Si, Al, or Y in the recess 8. It is formed by injecting to a position higher than the LED chip 6 and thermosetting, and the boundary surface 11a with the phosphor layer 12 is formed in a curved surface recessed to the blue light emitting LED chip 6 side (lower surface side in FIG. 3). Yes. The curved boundary surface 11a is preferably 1 μm to 5 μm, for example, between the upper end and the lower end of the curve.

また、拡散層11の封止樹脂10に添加した拡散剤の添加量が3〜5質量%であるので、光束を低下させずに白色光の色むらを低減することができる。次の表1は拡散剤の添加量による光束変化を示す。なお、拡散剤の添加量ゼロ、すなわち、拡散剤の添加量無しの場合の光束を100%とすると、拡散剤の添加量が5質量%を超過すると、光束が低下し、同添加量が3質量%未満になると、色むら低減効果が低下した。   Moreover, since the addition amount of the diffusing agent added to the sealing resin 10 of the diffusion layer 11 is 3 to 5% by mass, it is possible to reduce the color unevenness of white light without reducing the luminous flux. Table 1 below shows changes in luminous flux depending on the amount of diffusing agent added. In addition, when the addition amount of the diffusing agent is zero, that is, when the addition amount of the diffusing agent is 100%, when the addition amount of the diffusing agent exceeds 5% by mass, the light flux is decreased and the addition amount is 3 When the content was less than mass%, the effect of reducing color unevenness decreased.

黄色発光蛍光体層12は、拡散層11の熱硬化形成後、凹部8内に、LEDチップ6からの青色発光を受光して黄色に蛍光発光する黄色発光蛍光体を所要質量%添加した封止樹脂を注入して熱硬化させて構成されている。   The yellow light-emitting phosphor layer 12 is sealed by adding the required mass% of a yellow light-emitting phosphor that receives blue light from the LED chip 6 and fluoresces yellow after the thermosetting formation of the diffusion layer 11. It is configured by injecting resin and thermosetting.

図4は制光体の正面図であり、制光体23はLEDチップ6に対応して9つの部分が一体となって構成されて、反射体9上に配設されて固定される。図5は制光体の一部の拡大平面図である。図6は図5の拡大平面図の対角線方向の断面図である。   FIG. 4 is a front view of the light control body. The light control body 23 is configured by integrating nine portions corresponding to the LED chip 6, and is disposed and fixed on the reflector 9. FIG. 5 is an enlarged plan view of a part of the light control body. 6 is a cross-sectional view in the diagonal direction of the enlarged plan view of FIG.

照明装置は、前記反射体9の表面側で縦横方向に等間隔に配列されて実装されたLEDチップ6、および反射体9の表面側に配置された制光体23を有している。制光体23は、導光性を有する透明な樹脂やガラスなどによって一体形成され、各LEDチップ6に対応して縦横方向に等間隔に配列されたプリズムまたはレンズである複数の制光体部24を有している。   The illuminating device has LED chips 6 mounted on the surface side of the reflector 9 arranged at equal intervals in the vertical and horizontal directions, and a light control body 23 arranged on the surface side of the reflector 9. The light control body 23 is a plurality of light control body portions which are prisms or lenses which are integrally formed of transparent resin or glass having light guide properties and are arranged at equal intervals in the vertical and horizontal directions corresponding to the respective LED chips 6. Has 24.

各制光体部24の背面側には、LEDチップ6を収容する断面円筒形の凹部である収容部25が形成され、この収容部25の内面にLEDチップ6からの光が入射する入射面26が形成され、収容部25の周囲で表面側へ向けて拡開して光を表面側へ反射させる反射面27が形成され、また、各制光体部24の表面側には、入射した光が出射する発光面15を構成する四角形状の出射面28が形成されている。   On the back side of each light control body portion 24, a housing portion 25 which is a concave portion having a cylindrical cross section for housing the LED chip 6 is formed, and an incident surface on which light from the LED chip 6 enters the inner surface of the housing portion 25 26 is formed, and a reflection surface 27 is formed that spreads toward the surface side around the accommodating portion 25 and reflects light to the surface side, and is incident on the surface side of each light control body portion 24 A square-shaped emission surface 28 that constitutes the light emitting surface 15 from which light is emitted is formed.

入射面26としては、LEDチップ6の発光面の正面に対向して位置する対向入射面29が形成されているとともに、LEDチップ6の発光面の側方に位置する側面入射面30が形成されている。対向入射面29は収容部25内に突出する凸面のレンズ部31に形成され、このレンズ部31によって入射した光をLEDチップ6の発光面に垂直な光軸Sに略平行な方向に向けて屈折させる。   As the incident surface 26, an opposing incident surface 29 is formed so as to be opposed to the front surface of the light emitting surface of the LED chip 6, and a side incident surface 30 positioned beside the light emitting surface of the LED chip 6 is formed. ing. The opposite incident surface 29 is formed on a convex lens portion 31 protruding into the housing portion 25, and the light incident by the lens portion 31 is directed in a direction substantially parallel to the optical axis S perpendicular to the light emitting surface of the LED chip 6. Refract.

反射面27としては、収容部25の周囲で出射面28側へ向けて拡開して側面入射面30から入射した光を出射面28のうちLEDチップ6に対向する対向部域28aより外側の周辺部域28bへ向けて反射させる主反射面32が形成されているとともに、出射面28の周辺部域28bの一部である四隅の角部28cにおける背面側で出射面28の対向部域28a側から周辺部域28bの角部28c側へ向かう光を周辺部域28bの角部28cから出射させる周辺反射面33が形成されている。主反射面32および周辺反射面33で反射した光が出射面28から出射する方向は、中心の光軸Sに対して主に外側へ広がる方向になるように構成されている。   As the reflecting surface 27, the light that has spread around the housing portion 25 toward the emission surface 28 side and is incident from the side surface incidence surface 30 is outside the facing region 28 a that faces the LED chip 6 in the emission surface 28. A main reflection surface 32 that reflects toward the peripheral area 28b is formed, and the opposite area 28a of the emission surface 28 on the back side of the corners 28c of the four corners that are part of the peripheral area 28b of the emission surface 28 A peripheral reflection surface 33 is formed to emit light from the side toward the corner portion 28c of the peripheral area 28b from the corner portion 28c of the peripheral area 28b. The direction in which the light reflected by the main reflection surface 32 and the peripheral reflection surface 33 is emitted from the emission surface 28 is configured to be a direction that spreads mainly outward with respect to the central optical axis S.

出射面28のうち光軸Sを中心とした中心部域であってLEDチップ6に対向する対向部域28aに、対向部域28aへ向かう光の一部をその対向部域28aより外側の周辺部域28bへ向けて反射させる制光部34が形成されている。この制光部34には光軸Sを中心として出射面28より角錐形に窪む窪み部35が形成され、この窪み部35には対向部域28aから光を出射させるための出射面28に平行な四角形環状の出射面部36と周辺部域28bへ光を反射させる出射面28に対して略90°傾斜した四角形環状の反射面部37とが光軸Sを中心として交互に形成されている。出射面部36および反射面部37の各辺は出射面28の各角部28cに臨んで形成され、出射面部37の面積は窪み部35の中心に近付くほど小さく、外側に近付くほど大きく形成されている。   A part of the light traveling toward the facing area 28a is surrounded by a central area around the optical axis S of the emission surface 28 and facing the LED chip 6 around the outside of the facing area 28a. A light control part 34 that reflects toward the area 28b is formed. The light control portion 34 is formed with a hollow portion 35 that is recessed in a pyramidal shape from the light exit surface 28 with the optical axis S as a center. The light recess portion 35 has a light exit surface 28 for emitting light from the opposed region 28a. Parallel quadrangular annular emission surface portions 36 and quadrangular annular reflection surface portions 37 inclined by approximately 90 ° with respect to the emission surface 28 that reflects light to the peripheral region 28b are alternately formed around the optical axis S. Each side of the emission surface portion 36 and the reflection surface portion 37 is formed so as to face each corner portion 28c of the emission surface 28, and the area of the emission surface portion 37 is smaller as it is closer to the center of the recess portion 35 and larger as it is closer to the outside. .

そして、このように構成された発光装置3において、LEDチップ6を点灯させることにより、LEDチップ6から対向入射面29に入射する光はレンズ部31を通じて光軸Sと平行な光となって出射面28の対向部域28aへ向かう。対向部域28aへ向かう光のうち、対向部域28aの出射面部36に到達した光は出射面部36を通じて出射し、また、反射面部37に到達した光は反射面部37を透過せずに反射面部37で周辺部域28bへ向けて反射させ、この周辺部域28bへ向かう光が周辺反射面33で再度反射して出射面28の周辺部域28bの角部28cから出射させる。   In the light emitting device 3 configured as described above, when the LED chip 6 is turned on, the light incident on the opposing incident surface 29 from the LED chip 6 is emitted as light parallel to the optical axis S through the lens unit 31. To the opposite area 28a of the surface 28. Of the light traveling toward the facing area 28a, the light that has reached the exit surface 36 of the facing area 28a is emitted through the exit surface 36, and the light that has reached the reflecting surface 37 is not transmitted through the reflecting surface 37 but is reflected by the reflecting surface 37. The light is reflected toward the peripheral area 28b at 37, and the light traveling toward the peripheral area 28b is reflected again by the peripheral reflection surface 33 and emitted from the corner portion 28c of the peripheral area 28b of the emission surface 28.

図6に示すように、LEDチップ6から側面入射面30に入射する光は、主反射面32で反射し、出射面28の対向部域28aより外側の周辺部域28bから出射する。このように、制光体23の対向入射面30から入射して出射面28の対向部域28aへ向かう光の一部を周辺部域28bへ向けて反射させ、対向部域28aから周辺部域28bへ向かう光を周辺反射面33によって出射面28の周辺部域28bから出射させるため、出射面28の対向部域28aの輝度を低めるとともに周辺部域28bの輝度を高め、出射面28の対向部域28aと周辺部域28bとの輝度むらを低減し、出射面28の輝度を均一化できる。   As shown in FIG. 6, the light incident on the side incident surface 30 from the LED chip 6 is reflected by the main reflecting surface 32 and is emitted from the peripheral region 28 b outside the opposed region 28 a of the emitting surface 28. In this way, a part of the light that enters from the opposing incident surface 30 of the light control body 23 and travels toward the opposing region 28a of the exit surface 28 is reflected toward the peripheral region 28b, and is reflected from the opposing region 28a to the peripheral region. Since the light toward 28b is emitted from the peripheral region 28b of the emission surface 28 by the peripheral reflection surface 33, the luminance of the opposed region 28a of the emission surface 28 is lowered and the luminance of the peripheral region 28b is increased, and the emission surface 28 is opposed to The luminance unevenness between the area 28a and the peripheral area 28b can be reduced, and the luminance of the emission surface 28 can be made uniform.

本実施形態では、最大輝度200cd/m2(平方メートル)、最小輝度50cd/m2(平方メートル)となり、輝度比は、0.250となった。前記拡散層11との相乗効果によるものと考えられる。これは、制光体がない場合における最大輝度1200cd/m2(平方メートル)と最小輝度1cd/m2(平方メートル)との輝度比は、0.001と比較して十分な効果を奏する。また、既存の施設用一般蛍光ランプ照明器具では、最大輝度8000cd/m2(平方メートル)、最小輝度1800cd/m2(平方メートル)となり、輝度比は、0.225であり、本実施形態の輝度比が優れていることが分かった。   In the present embodiment, the maximum luminance is 200 cd / m 2 (square meter), the minimum luminance is 50 cd / m 2 (square meter), and the luminance ratio is 0.250. This is considered to be due to a synergistic effect with the diffusion layer 11. This has a sufficient effect when the luminance ratio between the maximum luminance of 1200 cd / m 2 (square meter) and the minimum luminance of 1 cd / m 2 (square meter) in the absence of the light control member is 0.001. In addition, in the existing general fluorescent lamp lighting fixture for facilities, the maximum luminance is 8000 cd / m 2 (square meter), the minimum luminance is 1800 cd / m 2 (square meter), the luminance ratio is 0.225, and the luminance ratio of this embodiment is excellent. I found out.

さらに、制光体23の側面入射面30から入射した光を主反射面32によって対向部域28aより外側の周辺部域28bへ向けて反射させるため、周辺部域28bの輝度を向上できる。   Furthermore, since the light incident from the side incident surface 30 of the light control body 23 is reflected by the main reflection surface 32 toward the peripheral region 28b outside the opposed region 28a, the luminance of the peripheral region 28b can be improved.

また、出射面28の対向部域28aに光軸Sを中心として出射面28より窪む窪み部35を形成し、この窪み部35に出射面部36と反射面部37とを光軸Sを中心として交互に形成したため、出射面28の対向部域28aへ向かう光を、出射面部36を通じて出射させる方向と周辺部域28bへ反射させる方向とに振り分けることができる。   In addition, a recess 35 that is recessed from the exit surface 28 with the optical axis S as the center is formed in the opposite area 28 a of the exit surface 28, and the exit surface 36 and the reflection surface 37 are centered around the optical axis S in the recess 35. Since they are formed alternately, the light traveling toward the opposed area 28a of the emission surface 28 can be distributed into the direction of emission through the emission surface section 36 and the direction of reflection to the peripheral area 28b.

出射面部36の面積を窪み部35の中心に近付くほど小さく設けたため、中心に近付くほど出射面部36を通じて出射する光を抑えることができる。   Since the area of the emission surface portion 36 is set smaller as it approaches the center of the hollow portion 35, the light emitted through the emission surface portion 36 can be suppressed as it approaches the center.

出射面28を四角形に形成するとともに、窪み部35の出射面部36および反射面部37を四角形でかつ出射面部36および反射面部37の各辺が出射面28の各角部28cに臨むように形成したため、出射面28の角部28cの輝度を向上させることができる。なお、出射面部36および反射面部37の形状は円環状でもよい。   The exit surface 28 is formed in a square shape, and the exit surface portion 36 and the reflection surface portion 37 of the recess 35 are formed in a square shape so that each side of the exit surface portion 36 and the reflection surface portion 37 faces each corner portion 28c of the exit surface 28. In addition, the luminance of the corner portion 28c of the emission surface 28 can be improved. The emission surface portion 36 and the reflection surface portion 37 may have an annular shape.

また、マトリクス状に配置される各LEDチップ6から制光体23に入射した光を出射する出射面28のうち、各LEDチップ6に対向する対向部域28aへ向かう光の一部をその対向部域28aより外側で各LEDチップ6に対向しない周辺部域28bから出射させるため、出射面28に暗部が生じるのを改善できる。   In addition, out of the emission surface 28 that emits the light incident on the light control body 23 from each LED chip 6 arranged in a matrix, a part of the light directed to the opposed area 28a that faces each LED chip 6 is opposed to that. Since the light is emitted from the peripheral region 28b that does not oppose each LED chip 6 outside the region 28a, it is possible to improve the occurrence of a dark portion on the emission surface 28.

図7は、他の実施の形態における照明装置の輝度比と平均輝度との関係図を示すものである。すなわち、本実施形態では、上述した実施形態のようにマトリクス状に配置される複数の発光素子により所定の平均輝度として7000〜10000cd/m2(平方メートル)以上となるように構成された照明装置において、上記各発光素子の輝度と周辺部の輝度の輝度比が0.01以上1未満となるように構成されているものである。   FIG. 7 shows a relationship diagram between the luminance ratio and the average luminance of the illumination device according to another embodiment. That is, in the present embodiment, in the lighting device configured to have a predetermined average luminance of 7000 to 10000 cd / m 2 (square meters) or more by a plurality of light emitting elements arranged in a matrix as in the above-described embodiment, The luminance ratio between the luminance of each light emitting element and the luminance of the peripheral portion is configured to be 0.01 or more and less than 1.

照明装置は、取付け高さh=1800mm(照明装置の設置高さから被験者の目の高さまでの距離)に設置された場合において、発光素子の輝度Lpと周辺部の輝度Lbの比Lb/Lpを輝度比とした。なお、Lb=50cd/m2(平方メートル)である。被験者の視線の位置は、照明装置の中心(直視)と照明装置の下方10°(周辺視)の2種類行っており、いずれも同様の傾向を示す。   When the illumination device is installed at a mounting height h = 1800 mm (distance from the installation height of the illumination device to the eye height of the subject), the ratio Lb / Lp between the luminance Lp of the light emitting element and the luminance Lb of the peripheral portion. Was defined as the luminance ratio. Note that Lb = 50 cd / m @ 2 (square meter). The subject's line of sight has two types, the center of the lighting device (direct view) and 10 ° below the lighting device (peripheral vision), both of which show the same tendency.

上記条件の下で被験者が照明装置を見た場合、「まぶしさが気になり始める」から「不快だと感じ始める」という不快グレア評価をするときの照明装置の平均輝度(照明装置全体の平均的な輝度、BCD平均輝度という。)を算出し、7000〜10000cd/m2(平方メートル)以上であることを求めた。   When the subject looks at the lighting device under the above conditions, the average luminance of the lighting device when performing an unpleasant glare evaluation from “being worried about glare” to “beginning to feel uncomfortable” (average of the entire lighting device) Brightness and BCD average brightness) were calculated and determined to be 7000 to 10000 cd / m @ 2 (square meter) or more.

次に、各発光素子の輝度Lpと周辺部の輝度Lbの比Lb/Lpを輝度比として、前記BCD平均輝度の照明装置おいて、前記輝度比を変化させた場合に、被験者は、どの程度の輝度比から不快グレアを評価するのかを求め、この結果を図7にまとめた。   Next, when the luminance ratio is changed in the lighting device having the BCD average luminance with the luminance ratio Lb / Lp between the luminance Lp of each light emitting element and the luminance Lb of the peripheral portion as the luminance ratio, Whether or not to evaluate discomfort glare was determined from the luminance ratio, and the results are summarized in FIG.

図7は、横軸に輝度比を対数logで表わし、縦軸にBCD平均輝度比を対数logで表している。この結果、輝度比が増加すると当該平均輝度が増加し、不快グレアが軽減されることが分かる。   In FIG. 7, the horizontal axis represents the luminance ratio in logarithmic log, and the vertical axis represents the BCD average luminance ratio in logarithmic log. As a result, it can be seen that when the luminance ratio increases, the average luminance increases and unpleasant glare is reduced.

また、照明装置が7000〜10000cd/m2(平方メートル)以上のBCD平均輝度を有するものである場合においては、前記輝度比が0.01からまぶしさが気にならなくなることを知見したものである。   In addition, when the lighting device has a BCD average luminance of 7000 to 10000 cd / m 2 (square meter) or more, the luminance ratio is 0.01, and it has been found that the glare does not matter.

本発明の一実施の形態を示す照明装置の平面図。The top view of the illuminating device which shows one embodiment of this invention. 同じく、図1のII−II線断面図。Similarly, the II-II sectional view taken on the line of FIG. 同じく、図2のIII部拡大図。Similarly, the III part enlarged view of FIG. 同じく、制光体の正面図。Similarly, the front view of a light control body. 同じく、制光体の一部の拡大平面図。Similarly, the one part enlarged plan view of a light control object. 同じく、図5の拡大平面図の対角線方向の断面図。Similarly, sectional drawing of the diagonal direction of the enlarged plan view of FIG. 他の実施の形態における照明装置の輝度比と平均輝度との関係図。The relationship figure of the luminance ratio and average luminance of the illuminating device in other embodiment.

符号の説明Explanation of symbols

2 基板、4 絶縁体、5a,5b 回路パターン、6 発光素子、9 反射体、12 蛍光体層、23 制光体。   2 substrate, 4 insulator, 5a, 5b circuit pattern, 6 light emitting element, 9 reflector, 12 phosphor layer, 23 light control body.

Claims (4)

基板と;
基板に配設された絶縁体と;
絶縁体を介して前記基板に配設された回路パターンと;
回路パターンを介してマトリクス状に配置される複数の発光素子と;
前記基板に配設され、前記複数の発光素子から放射される光を反射する反射体と;
前記発光素子からの光を変換する蛍光体層と;
前記各発光素子から入射した光を出射する出射面を有し、出射面のうち各発光素子に対向する対向部域へ向かう光の一部をその対向部域より外側で各発光素子に対向しない周辺部域から出射させる周辺部域を有し、最高輝度と最低輝度の比率が0.01以上1未満となるように構成されている制光体と;
を具備することを特徴とする照明装置。
A substrate;
An insulator disposed on the substrate;
A circuit pattern disposed on the substrate via an insulator;
A plurality of light emitting elements arranged in a matrix through a circuit pattern;
A reflector disposed on the substrate and reflecting light emitted from the plurality of light emitting elements;
A phosphor layer for converting light from the light emitting element;
A light emitting surface that emits light incident from each of the light emitting elements, and a part of the light that is directed to the facing area that faces each light emitting element of the emitting surface is not opposed to each light emitting element outside the facing area; A light control body having a peripheral area that is emitted from the peripheral area and configured such that a ratio of the highest luminance to the lowest luminance is 0.01 or more and less than 1;
An illumination device comprising:
制光体は、発光素子から側方へ向かう光を出射面の対向部域より外側の周辺部域へ向けて反射させる主反射面を有することを特徴とする請求項1記載の照明装置。   The lighting device according to claim 1, wherein the light control member has a main reflection surface that reflects light directed from the light emitting element to the side toward a peripheral region outside the opposed region of the emission surface. 出射面の制光部には、発光素子の光軸を中心として出射面より窪む窪み部が形成され、この窪み部には対向部域から光を出射させる環状の出射面部と周辺部域へ光を反射させる環状の反射面部とが光軸を中心として交互に形成され、出射面部の面積が窪み部の中心に近付くほど小さく設けられたことを特徴とする請求項2記載の照明装置。   The light control portion of the light emission surface is formed with a hollow portion that is recessed from the light emission surface with the optical axis of the light emitting element as the center, and this hollow portion is formed into an annular light emission surface portion that emits light from the opposed region and a peripheral region. 3. The illumination device according to claim 2, wherein annular reflecting surface portions that reflect light are alternately formed with the optical axis as a center, and the area of the exit surface portion is provided smaller as it approaches the center of the recessed portion. マトリクス状に配置される複数の発光素子により所定の平均輝度となるように構成された照明装置において、上記各発光素子の輝度と周辺部の輝度の輝度比が0.01以上1未満となるように構成されていることを特徴とする照明装置。   In a lighting device configured to have a predetermined average luminance by a plurality of light emitting elements arranged in a matrix, a luminance ratio between the luminance of each of the light emitting elements and the luminance of the peripheral portion is 0.01 or more and less than 1. It is comprised in the lighting apparatus characterized by the above-mentioned.
JP2005187749A 2005-03-01 2005-06-28 Lighting system Pending JP2006278309A (en)

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KR100868170B1 (en) * 2007-06-13 2008-11-12 노순호 High brightness light-emitting diode cover
JP2008305923A (en) * 2007-06-06 2008-12-18 Sony Corp Light-emitting device, surface light source device, and image display device
JP2010086726A (en) * 2008-09-30 2010-04-15 Ushio Inc Light source unit, and exposure device equipped with the same
JP2010102875A (en) * 2008-10-22 2010-05-06 Panasonic Corp Light guide body, light guide plate, backlight unit, and liquid crystal display provided with the same
JP2010108919A (en) * 2008-10-01 2010-05-13 Mitsubishi Electric Corp Planar light source device, and display using the same
KR101150713B1 (en) 2009-11-27 2012-06-08 주식회사 세코닉스 A condensing lens having a oval-shape light emitting
JP2013048062A (en) * 2011-08-29 2013-03-07 Stanley Electric Co Ltd Lamp
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JP2018524789A (en) * 2015-05-26 2018-08-30 ラディアント オプト‐エレクトロニクス (スーチョウ) カンパニー リミテッド Optical lens, backlight module, and display device
CN114236901A (en) * 2017-03-31 2022-03-25 沪苏艾美珈光学技术(江苏)有限公司 Light distribution control element, light distribution adjustment mechanism, reflection member, reinforcing plate, illumination unit, display, and television

Cited By (15)

* Cited by examiner, † Cited by third party
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JP2008305923A (en) * 2007-06-06 2008-12-18 Sony Corp Light-emitting device, surface light source device, and image display device
KR100868170B1 (en) * 2007-06-13 2008-11-12 노순호 High brightness light-emitting diode cover
JP2010086726A (en) * 2008-09-30 2010-04-15 Ushio Inc Light source unit, and exposure device equipped with the same
US9182538B2 (en) 2008-10-01 2015-11-10 Mitsubishi Electric Corporation Planar light source device and display apparatus incorporating same
JP2010108919A (en) * 2008-10-01 2010-05-13 Mitsubishi Electric Corp Planar light source device, and display using the same
JP2011258581A (en) * 2008-10-01 2011-12-22 Mitsubishi Electric Corp Surface light source device and display device using this
JP2010102875A (en) * 2008-10-22 2010-05-06 Panasonic Corp Light guide body, light guide plate, backlight unit, and liquid crystal display provided with the same
KR101150713B1 (en) 2009-11-27 2012-06-08 주식회사 세코닉스 A condensing lens having a oval-shape light emitting
JP2013048062A (en) * 2011-08-29 2013-03-07 Stanley Electric Co Ltd Lamp
JP2013222499A (en) * 2012-04-12 2013-10-28 Sharp Corp Light source substrate unit
JP5228217B1 (en) * 2012-06-19 2013-07-03 鈴木 優一 Lens, illumination device, light receiving device, and optical device
JP2014003168A (en) * 2012-06-19 2014-01-09 Yuichi Suzuki Lens, luminaire, photoreceiver, and optical device
JP2014175224A (en) * 2013-03-11 2014-09-22 Toshiba Corp Illuminating device and control method of illuminating device
JP2018524789A (en) * 2015-05-26 2018-08-30 ラディアント オプト‐エレクトロニクス (スーチョウ) カンパニー リミテッド Optical lens, backlight module, and display device
CN114236901A (en) * 2017-03-31 2022-03-25 沪苏艾美珈光学技术(江苏)有限公司 Light distribution control element, light distribution adjustment mechanism, reflection member, reinforcing plate, illumination unit, display, and television

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