JP2007265964A - Lighting system - Google Patents

Lighting system Download PDF

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JP2007265964A
JP2007265964A JP2007005703A JP2007005703A JP2007265964A JP 2007265964 A JP2007265964 A JP 2007265964A JP 2007005703 A JP2007005703 A JP 2007005703A JP 2007005703 A JP2007005703 A JP 2007005703A JP 2007265964 A JP2007265964 A JP 2007265964A
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light
lens
light source
yellow
blue
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Masahiro Toda
雅宏 戸田
Shinji Nogi
新治 野木
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Toshiba Lighting and Technology Corp
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Toshiba Lighting and Technology Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means 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
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched

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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system 11 capable of efficiently extracting light from light source parts 30, and of reducing color irregularity on an emission surface. <P>SOLUTION: This lighting system is provided with the plurality of light source parts 30 for emitting blue light and yellow light, and a light extraction lens 18 facing to the plurality of light source parts 30. The light extraction lens 18 is provided with incident surfaces 45 each surrounding a light emission surface 31 of each light source part 30 to enter the blue light and the yellow light emitted from the respective light source parts 30 to form parallel light. Total reflection surfaces 46 facing to the incident surfaces 45 for reflecting the entered blue light and yellow light as parallel light are formed. A plurality of lens surfaces 50 generating a white light emission part 51 by focusing the parallel light of the blue light and yellow light to form white light is formed. The lighting system is structured such that emission regions A of the respective light source parts 30 overlap one another in the light extraction lens 18. The light from the light source parts 30 is efficiently extracted, and color irregularity on the emission surface is reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、発光ダイオードチップを用いた照明装置に関する。   The present invention relates to a lighting device using a light emitting diode chip.

従来、発光ダイオードチップを用いた照明装置は、基板上に凹部を有する反射体が設けられ、この凹部内の中央に発光ダイオードチップが配設されている。   Conventionally, an illumination device using a light emitting diode chip is provided with a reflector having a recess on a substrate, and the light emitting diode chip is disposed at the center of the recess.

そして、この種の照明装置により、白色光を発光させるには、樹脂に黄色発光蛍光体を含有させた蛍光体層を凹部内に充填し、凹部内の青色光を発光する発光ダイオードチップを蛍光体層によって被覆することにより、発光ダイオードチップが発光する青色光と、この青色光で黄色発光体を励起させることで発光する黄色光とを混色させて白色光を得ている。   In order to emit white light with this type of lighting device, a phosphor layer containing a yellow light-emitting phosphor in a resin is filled in the recess, and the light-emitting diode chip that emits blue light in the recess is fluorescent. By covering with the body layer, the blue light emitted from the light emitting diode chip and the yellow light emitted by exciting the yellow light emitter with the blue light are mixed to obtain white light.

また、凹部に対向して１枚のレンズを配設することにより、凹部から放出される光の配光制御が可能となる。   Further, by disposing one lens facing the concave portion, it is possible to control light distribution of light emitted from the concave portion.

また、レンズとして１枚または２枚のフライアイレンズを用い、このフライアイレンズを複数の発光ダイオードチップに対して所定の間隔をあけて配設することが知られている。このフライアイレンズを用いることにより、照明装置の厚みを薄くしながら、特定の照射範囲を照射することを可能としている（例えば、特許文献１参照。）。
特開２００５−１９０９５４号公報（第３−４頁、図１−３） In addition, it is known that one or two fly-eye lenses are used as a lens, and the fly-eye lens is disposed at a predetermined interval with respect to a plurality of light-emitting diode chips. By using this fly-eye lens, it is possible to irradiate a specific irradiation range while reducing the thickness of the illumination device (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-190954 (page 3-4, FIG. 1-3)

ところで、凹部内の中央の発光ダイオードチップから青色光を発光し、凹部内の全域の蛍光体層から黄色光を発光するため、凹部を外方から見た場合、これら青色光の発光源と黄色光の発光源とで大きさに違いがある。   By the way, in order to emit blue light from the central light emitting diode chip in the recess and to emit yellow light from the phosphor layers in the entire area in the recess, when the recess is viewed from the outside, these blue light emission sources and yellow There is a difference in size depending on the light source.

そのため、１枚のレンズにより凹部から放出される光を制御する場合、青色光の発光源と黄色光の発光源との大きさの違いがレンズによって照射面に投影されるため、照射面の中央域では青色光の照度が高い分布となり、周縁域では黄色光が分布し、照射面で色むらが生じる問題がある。   Therefore, when controlling the light emitted from the recess by one lens, the difference in size between the blue light source and the yellow light source is projected onto the irradiation surface by the lens, so that the center of the irradiation surface There is a problem that the illuminance of blue light is high in the region, yellow light is distributed in the peripheral region, and color unevenness occurs on the irradiated surface.

また、レンズとしてフライアイレンズを用いる場合、このフライアイレンズを発光ダイオードチップに対して所定の間隔をあけて配設するため、発光ダイオードチップから光軸方向へ放出された平行光はフライアイレンズに効率よく入射するが、発光ダイオードチップから光軸方向に対して交差する方向へ放出された光はフライアイレンズに入射しなかったり反射してしまうなどして、光を効率よく取り出すことができない問題がある。   Further, when a fly-eye lens is used as a lens, the fly-eye lens is disposed at a predetermined interval with respect to the light-emitting diode chip, so that the parallel light emitted from the light-emitting diode chip in the optical axis direction is a fly-eye lens. However, the light emitted from the light emitting diode chip in the direction intersecting the optical axis direction does not enter the fly-eye lens or is reflected so that the light cannot be extracted efficiently. There's a problem.

また、上述のように発光ダイオードチップおよび蛍光体層を設けた凹部に対して所定の間隔をあけてフライアイレンズを配設したとした場合、発光ダイオードチップから光軸方向へ放出される青色光はフライアイレンズに入射しやすく取出効率がよいが、蛍光体層から放出される黄色光は青色光に比べて平行光の割合が少ないのでフライアイレンズに入射する量が少なく取出効率が低いため、照射面での青色光の光度が高く、黄色光の光度が低くなり、これによって色むらが発生しやすくなる。   Further, when the fly-eye lens is disposed at a predetermined interval with respect to the concave portion provided with the light emitting diode chip and the phosphor layer as described above, the blue light emitted from the light emitting diode chip in the optical axis direction. Is easy to enter the fly-eye lens and has good extraction efficiency, but the yellow light emitted from the phosphor layer has a lower proportion of parallel light than blue light, so the amount of incident light is low and the extraction efficiency is low. The luminous intensity of blue light on the irradiated surface is high, and the luminous intensity of yellow light is low, which tends to cause color unevenness.

本発明は、このような点に鑑みなされたもので、光源部からの光を効率よく取り出すことができ、照射面での色むらの発生も低減できる照明装置を提供することを目的とする。   SUMMARY An advantage of some aspects of the invention is that it provides an illumination device that can efficiently extract light from a light source unit and reduce color unevenness on an irradiation surface.

請求項１記載の照明装置は、中央部に配設された青色光を発光する発光ダイオードチップ、および発光ダイオードチップの青色光の発光面積よりも大きな発光面積を有し青色光により励起されて黄色光を発光する蛍光体層を備え、青色光および黄色光を放射する発光面が形成された複数の光源部と；各光源部の発光面から放射される青色光および黄色光の全ての光が入射して平行光とするように各光源部の発光面を包囲する入射面、入射面に対向して設けられ入射した青色光および黄色光を平行光として反射する全反射面、および平行光を集光させて白色発光部を生成する複数のレンズ面を備え、各光源部の照射領域が重なり合うように構成された光取出レンズと；を具備しているものである。   The illumination device according to claim 1 is a light-emitting diode chip that emits blue light disposed in a central portion, and has a light-emitting area larger than a light-emitting area of blue light of the light-emitting diode chip, and is excited by blue light to be yellow A plurality of light source portions each having a phosphor layer that emits light and having a light emitting surface that emits blue light and yellow light; and all of the blue light and yellow light emitted from the light emitting surface of each light source portion An incident surface that surrounds the light emitting surface of each light source unit so as to be incident and become parallel light, a total reflection surface that is provided opposite to the incident surface and reflects incident blue light and yellow light as parallel light, and parallel light A light extraction lens that includes a plurality of lens surfaces that condense and generate a white light-emitting portion, and that is configured so that the irradiation regions of the light source portions overlap each other.

光源部は、例えば、反射体の凹部内の中央部に発光ダイオードチップが配設され、この凹部内に蛍光体層が充填されて発光ダイオードチップを被覆することにより、蛍光体層の表面で青色光および黄色光を放射する発光面が形成される。複数の光源部は、例えば、マトリクス状あるいは直線状に隣り合うように配列される。   For example, the light source unit has a light emitting diode chip disposed in the center of the concave portion of the reflector, and the phosphor layer is filled in the concave portion to cover the light emitting diode chip, so that the surface of the phosphor layer is blue. A light emitting surface that emits light and yellow light is formed. The plurality of light source units are arranged, for example, so as to be adjacent to each other in a matrix or a straight line.

光取出レンズは、入射面で青色光および黄色光を平行光とし、さらに全反射面で青色光および黄色光を平行光とし、複数のレンズ面で青色光および黄色光の平行光を集光することにより、青色光および黄色光との混色によって白色光を発光する白色発光部を生成する。   The light extraction lens converts blue light and yellow light into parallel light on the incident surface, further converts blue light and yellow light into parallel light on the total reflection surface, and collects parallel light of blue light and yellow light on a plurality of lens surfaces. As a result, a white light emitting part that emits white light by generating a mixed color of blue light and yellow light is generated.

そして、光源部が発する青色光および黄色光を光取出レンズで光軸方向に平行な平行光とし、複数のレンズ面により平行光を集光させて白色発光部を生成して各光源部の照射領域が重なり合うようにしたことにより、光源部から光を効率よく取り出し、照射面での色むらの発生を低減する。   The blue light and yellow light emitted from the light source unit are converted into parallel light parallel to the optical axis direction by the light extraction lens, and the parallel light is collected by a plurality of lens surfaces to generate a white light emitting unit to irradiate each light source unit. By overlapping the regions, light is efficiently extracted from the light source unit, and the occurrence of color unevenness on the irradiated surface is reduced.

請求項２記載の照明装置は、請求項１記載の照明装置において、光取出レンズは、隣り合う一方の光源部に設けられた全反射面と他方の光源部に設けられた全反射面との間に接続部が形成され、接続部に対向する部分にレンズ面が形成されているものである。   The illumination device according to claim 2 is the illumination device according to claim 1, wherein the light extraction lens includes a total reflection surface provided in one adjacent light source unit and a total reflection surface provided in the other light source unit. A connecting portion is formed between them, and a lens surface is formed at a portion facing the connecting portion.

そして、光取出レンズの隣り合う全反射面の間の接続部に対向する部分に隣り合うレンズ面の間を形成した場合には、接続部の幅が狭く強度低下しやすくなり、接続部の強度を高くするために全反射面部分を低減させて接続部の幅を確保したのでは反射光率が低下するが、光取出レンズの隣り合う全反射面の間の接続部に対向する部分にレンズ面を形成したので、全反射面部分を低減させなくても接続部の幅を確保でき、つまり強度低下および全反射面部分を低減することを抑制しつつ複数のレンズ面を形成可能となる。   And when the space between the adjacent lens surfaces is formed in the portion facing the connection portion between the adjacent total reflection surfaces of the light extraction lens, the width of the connection portion is narrow and the strength is easily lowered, and the strength of the connection portion If the total reflection surface portion is reduced to increase the width of the connecting portion and the width of the connecting portion is ensured, the reflected light rate is reduced, but the lens is located at the portion facing the connecting portion between the adjacent total reflecting surfaces of the light extraction lens. Since the surface is formed, the width of the connecting portion can be ensured without reducing the total reflection surface portion, that is, a plurality of lens surfaces can be formed while suppressing a decrease in strength and reduction of the total reflection surface portion.

請求項１記載の照明装置によれば、光源部が発する青色光および黄色光を光取出レンズで光軸方向に平行な平行光とし、複数のレンズ面により平行光を集光させて白色発光部を生成して各光源部の照射領域が重なり合うようにしたので、光源部から光を効率よく取り出すことができ、照射面での色むらの発生も低減できる。   According to the illumination device of claim 1, the blue light and the yellow light emitted from the light source unit are converted into parallel light parallel to the optical axis direction by the light extraction lens, and the parallel light is collected by the plurality of lens surfaces, thereby the white light emitting unit. Since the irradiation regions of the light source units overlap each other, light can be efficiently extracted from the light source unit, and the occurrence of uneven color on the irradiation surface can be reduced.

請求項２記載の照明装置によれば、請求項１記載の照明装置の効果に加えて、光取出レンズの隣り合う一方の光源部に設けられた全反射面と他方の光源部に設けられた全反射面との間の接続部に対向する部分にレンズ面を形成したので、強度低下および全反射面部分を低減することを抑制しつつ複数のレンズ面を形成できる。   According to the illuminating device described in claim 2, in addition to the effect of the illuminating device described in claim 1, the illuminating device is provided on the total reflection surface provided on one light source unit adjacent to the light extraction lens and on the other light source unit. Since the lens surface is formed at a portion facing the connection portion between the total reflection surfaces, a plurality of lens surfaces can be formed while suppressing a decrease in strength and a reduction in the total reflection surface portion.

以下、本発明の一実施の形態を図面を参照して説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１乃至図９に第１の実施の形態を示し、図１は照明装置の断面図、図２は照明装置の光取出レンズに入射した青色光および黄色光を入射面および全反射面で平行光とする説明図、図３は照明装置の光取出レンズの各レンズ面から出射する光の説明図、図４は照明装置の光取出レンズのレンズ面側から見た正面図、図５は照明装置の光取出レンズを外した状態の正面図、図６は照明装置の１つの光源部の断面図、図７は照明装置の１つの光源部の蛍光体層を省略した正面図、図８は照明装置の光取出レンズを用いない場合に１つの光源部から光を照射する照射面での青色光と黄色光との強度分布のグラフ、図９は照明装置の光取出レンズを用いた場合に１つの光源部から光を照射する照射面での青色光と黄色光との強度分布のグラフである。   FIG. 1 to FIG. 9 show a first embodiment, FIG. 1 is a sectional view of an illuminating device, and FIG. 2 is a diagram in which blue light and yellow light incident on a light extraction lens of the illuminating device are parallel on the incident surface and total reflection surface FIG. 3 is an explanatory diagram of light emitted from each lens surface of the light extraction lens of the illumination device, FIG. 4 is a front view viewed from the lens surface side of the light extraction lens of the illumination device, and FIG. FIG. 6 is a cross-sectional view of one light source unit of the illumination device, FIG. 7 is a front view in which the phosphor layer of one light source unit of the illumination device is omitted, and FIG. FIG. 9 is a graph showing the intensity distribution of blue light and yellow light on an irradiation surface that emits light from one light source unit when the light extraction lens of the illumination device is not used. FIG. 9 shows the case where the light extraction lens of the illumination device is used. It is a graph of intensity distribution of blue light and yellow light on the irradiation surface which irradiates light from one light source part.

図１ないし図６において、照明装置11は、照明モジュール12を備え、この照明モジュール12が例えば照明器具の器具本体などの図示しない照明装置本体に対して着脱可能に取り付けられる。照明モジュール12には、複数の発光ダイオードチップ13がマトリクス状に配列されている。   1 to 6, the lighting device 11 includes a lighting module 12, and this lighting module 12 is detachably attached to a lighting device main body (not shown) such as a fixture main body of a lighting fixture. In the illumination module 12, a plurality of light emitting diode chips 13 are arranged in a matrix.

発光ダイオードチップ13は、例えばサファイア基板上に発光ピークが４５０〜４６０ｎｍの青色光Ｂを発光する窒化ガリウム（ＧａＮ）系半導体が積層されており、その表面にはワイヤボンディングするための陰極側と陽極側の電極がそれぞれ設けられたいわゆるダブルワイヤタイプが用いられている。このタイプの発光ダイオードチップ13は、光が表面側へ透光するとともに側面側や裏面側にも透過し、つまり全面から青色光Ｂが出る。   The light emitting diode chip 13 is formed by stacking, for example, a gallium nitride (GaN) semiconductor that emits blue light B having a light emission peak of 450 to 460 nm on a sapphire substrate, and a cathode side and an anode for wire bonding on the surface. A so-called double wire type in which side electrodes are provided is used. In this type of light emitting diode chip 13, light is transmitted to the front surface side and also transmitted to the side surface side and back surface side, that is, blue light B is emitted from the entire surface.

そして、照明モジュール12は、放熱性および剛性を有するアルミニウム（Ａｌ）やニッケル（Ｎｉ）、ガラスエポキシ樹脂などの平板状の基板14、この基板14の一面に形成された白色の絶縁層15、この絶縁層15上に形成された回路パターン層16、これら絶縁層15および回路パターン層16上に一体に形成された反射体17、および反射体17上に配設された光取出レンズ18を有している。   The lighting module 12 includes a flat substrate 14 made of aluminum (Al), nickel (Ni), glass epoxy resin or the like having heat dissipation and rigidity, a white insulating layer 15 formed on one surface of the substrate 14, A circuit pattern layer 16 formed on the insulating layer 15; a reflector 17 integrally formed on the insulating layer 15 and the circuit pattern layer 16; and a light extraction lens 18 disposed on the reflector 17. ing.

回路パターン層16には、各発光ダイオードチップ13の配設位置毎に、陰極側と陽極側の回路パターン（配線パターン）16a，16bが形成されている。回路パターン層16は、例えば、基板14の絶縁層15上にＣｕ層を形成し、回路パターン層16以外のＣｕ層の部分を除去した後、電界メッキによってＣｕ層上にＮｉ層およびＡｇ層を形成して構成されている。   In the circuit pattern layer 16, circuit patterns (wiring patterns) 16a and 16b on the cathode side and the anode side are formed for each arrangement position of each light emitting diode chip 13. The circuit pattern layer 16 is formed, for example, by forming a Cu layer on the insulating layer 15 of the substrate 14 and removing a portion of the Cu layer other than the circuit pattern layer 16 and then forming a Ni layer and an Ag layer on the Cu layer by electroplating. Formed and configured.

また、反射体17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）などの樹脂を基板14の一面に流し込んで一体に成形されている。各発光ダイオードチップ13の配設位置毎に、各発光ダイオードチップ13を収容する複数の凹部21が形成されている。各凹部21は、基板14に対して反対側へ向けて漸次拡開する円錐台状に形成されている。   The reflector 17 is integrally formed by pouring a resin such as PBT (polybutylene terephthalate), PPA (polyphthalamide), or PC (polycarbonate) into one surface of the substrate 14. A plurality of recesses 21 for accommodating each light-emitting diode chip 13 is formed for each position where each light-emitting diode chip 13 is disposed. Each recess 21 is formed in a truncated cone shape that gradually expands toward the opposite side with respect to the substrate 14.

各発光ダイオードチップ13は、凹部21の底面21aの中央部で絶縁層15上に例えば透明なエポキシ樹脂やシリコーン樹脂などの透明接着剤22を用いて固定されている。固定作業では、凹部21の底面21aの中央部で絶縁層15上に透明接着剤22を塗布し、この透明接着剤22に発光ダイオードチップ13を押し付ける。   Each light emitting diode chip 13 is fixed on the insulating layer 15 at the center of the bottom surface 21a of the recess 21 using a transparent adhesive 22 such as a transparent epoxy resin or silicone resin. In the fixing operation, the transparent adhesive 22 is applied on the insulating layer 15 at the center of the bottom surface 21a of the recess 21, and the light emitting diode chip 13 is pressed against the transparent adhesive 22.

発光ダイオードチップ13の表面の各電極と各回路パターン16a，16bの端部とは、ワイヤボンディングによるボンディングワイヤ23によって電気的に接続されている。   The electrodes on the surface of the light emitting diode chip 13 and the ends of the circuit patterns 16a and 16b are electrically connected by bonding wires 23 by wire bonding.

各凹部21には、発光ダイオードチップ13を被覆する被覆層である蛍光体層27が形成されている。この蛍光体層27は、透光性を有するシリコーン樹脂やエポキシ樹脂などの熱硬化性透明樹脂に発光ダイオードチップ13からの青色光Ｂにて励起して黄色光Ｙを発光する黄色蛍光体を主体とする蛍光体29が配合されたもので、蛍光体29を配合した樹脂を凹部21内に充填し、熱硬化させることにより形成されている。蛍光体29としては、黄色蛍光体が主体であるが、赤色蛍光体なども配合されている。   In each recess 21, a phosphor layer 27 that is a coating layer that covers the light emitting diode chip 13 is formed. The phosphor layer 27 is mainly composed of a yellow phosphor that emits yellow light Y by being excited by blue light B from the light emitting diode chip 13 on a thermosetting transparent resin such as a translucent silicone resin or epoxy resin. Is formed by filling the recess 21 with a resin containing the phosphor 29 and thermosetting the resin. The phosphor 29 is mainly a yellow phosphor, but a red phosphor or the like is also blended.

そして、凹部21、発光ダイオードチップ13、蛍光体層27などで光源部30が形成され、凹部21の開口側に位置する蛍光体層27の表面が青色光Ｂおよび黄色光Ｙを放射する発光面31として構成されている。したがって、基板14上には、複数の光源部30がマトリクス状に配列されている。   The light source section 30 is formed by the recess 21, the light emitting diode chip 13, the phosphor layer 27, etc., and the surface of the phosphor layer 27 located on the opening side of the recess 21 emits blue light B and yellow light Y. It is configured as 31. Therefore, a plurality of light source sections 30 are arranged in a matrix on the substrate 14.

また、図１ないし図４に示すように、光取出レンズ18は、各光源部30の発光面31に対向する複数のレンズ部41を有し、これら複数のレンズ部41がマトリクス状に配列されているとともに接続部42を介して一体に形成されている。   As shown in FIGS. 1 to 4, the light extraction lens 18 has a plurality of lens portions 41 facing the light emitting surface 31 of each light source portion 30, and the plurality of lens portions 41 are arranged in a matrix. And are formed integrally with each other through a connecting portion 42.

各レンズ部41は、光源部30の発光面31から放射される青色光Ｂおよび黄色光Ｙの全ての光が入射して平行光とするように光源部30の発光面31を包囲する入射面45、この入射面45に対向して入射した青色光Ｂおよび黄色光Ｙを光軸方向に平行な平行光として反射する全反射面46、および入射面45に対して反対側に位置して光が出射する出射面47を有している。   Each lens unit 41 has an incident surface that surrounds the light emitting surface 31 of the light source unit 30 so that all of the blue light B and yellow light Y emitted from the light emitting surface 31 of the light source unit 30 are incident and become parallel light. 45, a total reflection surface 46 that reflects the blue light B and the yellow light Y incident to the incident surface 45 as parallel light parallel to the optical axis direction, and light positioned on the opposite side of the incident surface 45 Has an exit surface 47 from which the light exits.

入射面45は、凹状で、光源部30に向けて漸次拡開する円錐台状に形成され、光源部30の発光面31の正面側に対向して青色光Ｂおよび黄色光Ｙを光軸方向に平行な平行光に屈折させるレンズ面部48、および光源部30の発光面31の周囲に対向する周面部49が形成されている。   The incident surface 45 has a concave shape and is formed in a truncated cone shape that gradually expands toward the light source unit 30. The incident surface 45 faces the front side of the light emitting surface 31 of the light source unit 30 and emits blue light B and yellow light Y in the optical axis direction. A lens surface part 48 that refracts parallel light parallel to the light source part 30 and a peripheral surface part 49 that faces the periphery of the light emitting surface 31 of the light source part 30 are formed.

全反射面46は、光源部30に対して反対側へ向けて漸次拡開する二次曲線にて形成され、入射面45の周面部49に対向して入射した青色光Ｂおよび黄色光Ｙを平行光として反射する。   The total reflection surface 46 is formed by a quadratic curve that gradually expands toward the opposite side with respect to the light source unit 30, and the blue light B and the yellow light Y that are incident to face the peripheral surface portion 49 of the incident surface 45. Reflects as parallel light.

出射面47には、青色光Ｂおよび黄色光Ｙの平行光を集光させる凸レンズ面で構成された複数のレンズ面50がマトリクス状に配列され、いわゆるフライアイレンズが一体に形成されている。そして、複数のレンズ面50により、青色光Ｂおよび黄色光Ｙの平行光を集光させて混色させることにより白色光を発光する白色発光部51を生成している。   On the emission surface 47, a plurality of lens surfaces 50 constituted by convex lens surfaces for condensing the parallel light of the blue light B and the yellow light Y are arranged in a matrix and a so-called fly-eye lens is integrally formed. And the white light emission part 51 which light-emits white light is produced | generated by condensing and mixing the parallel light of the blue light B and the yellow light Y with the some lens surface 50. As shown in FIG.

接続部42は、隣り合う一方の光源部30に設けられたレンズ部41の全反射面46と他方の光源部30に設けられたレンズ部41の全反射面46との間に形成されている。この接続部42に対向する部分に隣り合うレンズ面50の端部間が位置している。   The connection part 42 is formed between the total reflection surface 46 of the lens part 41 provided in one adjacent light source part 30 and the total reflection surface 46 of the lens part 41 provided in the other light source part 30. . A portion between the end portions of the lens surface 50 adjacent to the portion facing the connection portion 42 is located.

そして、図１に示すように、光取出レンズ18は、複数のレンズ面50の集光によって、各光源部30から放射された青色光Ｂおよび黄色光Ｙの照射領域Ａが互いに重なり合うように構成されている。なお、図１において、左側の光源部30から順に照射領域をA1、A2、A3と示す。   As shown in FIG. 1, the light extraction lens 18 is configured such that the irradiation areas A of the blue light B and the yellow light Y emitted from the respective light source units 30 overlap each other by condensing the plurality of lens surfaces 50. Has been. In FIG. 1, irradiation regions are indicated as A1, A2, and A3 in order from the left light source unit 30.

次に、本実施の形態の作用を説明する。   Next, the operation of the present embodiment will be described.

照明装置11において、陰極側と陽極側の回路パターン16a，16b間に外部から所定の直流電圧を印加すると、各光源部30の発光ダイオードチップ13が青色光Ｂを多方向に発光する。この青色光Ｂは蛍光体層27内に入射し、この蛍光体層27の黄色蛍光体を励起して黄色光Ｙを発光させる。そのため、これら発光ダイオードチップ13からの青色光Ｂと黄色蛍光体からの黄色光Ｙとを各光源部30の発光面31から光取出レンズ18に放射する。   In the illumination device 11, when a predetermined DC voltage is applied from the outside between the cathode-side and anode-side circuit patterns 16a and 16b, the light-emitting diode chip 13 of each light source unit 30 emits blue light B in multiple directions. The blue light B enters the phosphor layer 27 and excites the yellow phosphor of the phosphor layer 27 to emit yellow light Y. Therefore, the blue light B from the light emitting diode chip 13 and the yellow light Y from the yellow phosphor are radiated from the light emitting surface 31 of each light source unit 30 to the light extraction lens 18.

図２に示すように、光源部30の発光面31から放射される青色光Ｂおよび黄色光Ｙを含む全ての光は、光取出レンズ18の入射面45から光取出レンズ18内に入射し、出射面47である複数のレンズ面50から外部に出射する。   As shown in FIG. 2, all the light including the blue light B and the yellow light Y emitted from the light emitting surface 31 of the light source unit 30 enters the light extraction lens 18 from the incident surface 45 of the light extraction lens 18, The light exits from a plurality of lens surfaces 50 that are the exit surfaces 47.

このとき、光取出レンズ18のレンズ面部48に入射して屈折する青色光Ｂおよび黄色光Ｙが光軸方向に平行な平行光となり、光取出レンズ18の周面部49に入射して全反射面46で反射する青色光Ｂおよび黄色光Ｙが光軸方向に平行な平行光となり、これら平行光が複数のレンズ面50に入射する。   At this time, the blue light B and yellow light Y that are refracted by being incident on the lens surface portion 48 of the light extraction lens 18 become parallel light parallel to the optical axis direction, and are incident on the peripheral surface portion 49 of the light extraction lens 18 to be a total reflection surface. The blue light B and the yellow light Y reflected by 46 become parallel lights parallel to the optical axis direction, and these parallel lights are incident on the plurality of lens surfaces 50.

図３に示すように、複数のレンズ面50では入射する青色光Ｂおよび黄色光Ｙの平行光を集光させて白色発光部51を生成し、これら複数のレンズ面50で集光した青色光Ｂおよび黄色光Ｙの照射領域が互いに重なり合う。これにより、青色光Ｂおよび黄色光Ｙが混色して白色光となる。   As shown in FIG. 3, the plurality of lens surfaces 50 condense the incident blue light B and yellow light Y in parallel to generate a white light emitting portion 51, and the blue light collected by the plurality of lens surfaces 50. The irradiation areas of B and yellow light Y overlap each other. Thereby, the blue light B and the yellow light Y are mixed and become white light.

光取出レンズ18から出射する光を照射面に投影する。このとき、図１に示すように、各光源部30から放射された青色光Ｂおよび黄色光Ｙの照射領域Ａが重なり合う。これにより、照射面では青色光Ｂおよび黄色光Ｙが混色して白色光となり、照射面での色むらが少なくなる。   The light emitted from the light extraction lens 18 is projected onto the irradiation surface. At this time, as shown in FIG. 1, the irradiation areas A of the blue light B and the yellow light Y emitted from the light source units 30 overlap each other. As a result, blue light B and yellow light Y are mixed to form white light on the irradiated surface, and color unevenness on the irradiated surface is reduced.

そして、図８には、光取出レンズ18を用いず、１つの光源部30からの光を１ｍ離れた照射面に照射したときにおいて、光軸を中心とした距離と青色光Ｂおよび黄色光Ｙの強度分布とを測定した結果を示す。光取出レンズ18を用いないことで、光源部30から放射した光が照射面の広い範囲に拡散するため、強度分布の値は低いものの、青色光Ｂと黄色光Ｙとの照射領域および強度分布は略等しく、色むらは生じない。なお、図８にはそれぞれ５７７ｍｍ内の分布を実線で示しているが、図８には５７７ｍｍ以上をも細線で示し、５７７ｍｍ以上でも色むらは生じていない。   In FIG. 8, when the light from one light source unit 30 is irradiated to the irradiation surface 1 m away without using the light extraction lens 18, the distance around the optical axis and the blue light B and yellow light Y are shown. The result of measuring the intensity distribution of is shown. By not using the light extraction lens 18, the light emitted from the light source unit 30 diffuses over a wide range of the irradiation surface, so that the intensity distribution value is low, but the irradiation region and intensity distribution of the blue light B and yellow light Y are low. Are approximately equal and no color unevenness occurs. In FIG. 8, the distribution within 577 mm is shown by a solid line, but in FIG. 8, 577 mm or more is shown by a thin line, and color unevenness does not occur even at 777 mm or more.

また、図９には、光取出レンズ18を用い、１つの光源部30からの光を１ｍ離れた照射面に照射したときにおいて、光軸を中心とした距離と青色光Ｂおよび黄色光Ｙの強度分布とを測定した結果を示す。光取出レンズ18を用いて集光することで、光源部30から放射した光が照射面の所定の範囲に集光されるため、強度分布の値が高くなるものの、青色光Ｂは光軸中心領域に集中しやすく、黄色光Ｙは広い領域に分散しやすい傾向がある。   Further, in FIG. 9, when the light extraction lens 18 is used to irradiate the irradiation surface 1 m away from the light source unit 30, the distance around the optical axis, the blue light B, and the yellow light Y The result of measuring the intensity distribution is shown. By condensing using the light extraction lens 18, the light emitted from the light source unit 30 is condensed in a predetermined range of the irradiation surface, so that the intensity distribution value is high, but the blue light B is centered on the optical axis. The yellow light Y tends to concentrate in a wide area and tends to be dispersed in a wide area.

これは、凹部21内の中央の発光ダイオードチップ13から青色光Ｂが発光し、凹部21内の全域の蛍光体層27から黄色光Ｙが発光するため、凹部21を外方から見た場合、これら青色光Ｂの発光源と黄色光Ｙの発光源とで大きさに違いがあり、この青色光Ｂの発光源と黄色光Ｙの発光源との大きさの違いが光取出レンズ18によって照射面に投影されるため、照射面の中央域で青色光Ｂの強度分布が高く、それ以外の領域で黄色光Ｙの強度分布が高くなる傾向があり、照射面で色むらが生じやすくなる。   This is because the blue light B is emitted from the central light emitting diode chip 13 in the recess 21 and the yellow light Y is emitted from the phosphor layer 27 in the entire area of the recess 21, so that when the recess 21 is viewed from the outside, There is a difference in size between the light source of blue light B and the light source of yellow light Y, and the difference in size between the light source of blue light B and the light source of yellow light Y is irradiated by the light extraction lens 18. Since it is projected onto the surface, the intensity distribution of the blue light B tends to be high in the central area of the irradiated surface, and the intensity distribution of the yellow light Y tends to be high in other areas, and color unevenness tends to occur on the irradiated surface.

光取出レンズ18を用いた場合に、１つの光源部30についていえばこのような傾向があるが、複数の光源部30から放射された青色光Ｂおよび黄色光Ｙの照射領域Ａが互いに重なり合うため、照射面での色むらを低減できる。   When the light extraction lens 18 is used, there is such a tendency with respect to one light source unit 30, but the irradiation areas A of the blue light B and the yellow light Y emitted from the plurality of light source units 30 overlap each other. , Color unevenness on the irradiated surface can be reduced.

このように、光源部30が発する青色光Ｂおよび黄色光Ｙを光取出レンズ18で光軸方向に平行な平行光とし、複数のレンズ面50により平行光を集光させて白色発光部51を生成して各光源部30の照射領域Ａが重なり合うようにしたので、光源部30から光を効率よく取り出すことができ、照射面での色むらの発生も低減できる。   In this way, the blue light B and yellow light Y emitted from the light source unit 30 are converted into parallel light parallel to the optical axis direction by the light extraction lens 18, and the parallel light is condensed by the plurality of lens surfaces 50 so that the white light emitting unit 51 is formed. Since the irradiation areas A of the light source units 30 are overlapped with each other, the light can be efficiently extracted from the light source unit 30, and the occurrence of uneven color on the irradiation surface can be reduced.

また、光取出レンズ18により、光軸方向に対して交差する方向に向かう量が青色光Ｂに比べて多い黄色光Ｙを全反射面46で反射させて光軸方向へ平行光として向かわせることにより、複数のレンズ面50に入射する黄色光Ｙの量を増加させることができる。そのため、照射面での黄色光Ｙの強度を向上させ、色むらも改善できる。   Further, the light extraction lens 18 reflects the yellow light Y, which is more in the direction intersecting the optical axis direction than the blue light B, by the total reflection surface 46 and directs it as parallel light in the optical axis direction. Thus, the amount of yellow light Y incident on the plurality of lens surfaces 50 can be increased. Therefore, the intensity of yellow light Y on the irradiated surface can be improved, and color unevenness can also be improved.

また、光取出レンズ18と複数のレンズ面50で構成されるフライアイレンズとを一体に形成したため、光学的な損失が少なく、効率を向上できるとともに、部品点数を削減し、小形に構成できる。   In addition, since the light extraction lens 18 and the fly-eye lens composed of the plurality of lens surfaces 50 are integrally formed, there is little optical loss, the efficiency can be improved, the number of parts can be reduced, and a compact configuration can be achieved.

また、図１０に第２の実施の形態を示すように、光取出レンズ18は、隣り合う一方の光源部30に設けられたレンズ部41の全反射面46と他方の光源部30に設けられたレンズ部41の全反射面46との間の接続部42に対向する部分にレンズ面50の中央部を位置させるようにしてもよい。   As shown in the second embodiment in FIG. 10, the light extraction lens 18 is provided on the total reflection surface 46 of the lens part 41 provided on one adjacent light source part 30 and on the other light source part 30. Alternatively, the central portion of the lens surface 50 may be positioned at a portion facing the connection portion 42 between the lens portion 41 and the total reflection surface 46.

これは、光取出レンズ18の光軸方向の寸法が同じとする条件で、光取出レンズ18の隣り合う全反射面46の間の接続部42に対向する部分に隣り合うレンズ面50の間を形成した場合には、接続部42の幅が狭く強度低下しやすくなり、接続部42の強度を高くするために全反射面46の部分を低減させて接続部42の幅を確保したのでは反射光率が低下してしまうが、光取出レンズ18の隣り合う全反射面46の間の接続部42に対向する部分にレンズ面50を形成することにより、全反射面46の部分を低減させなくても接続部42の幅を確保でき、つまり強度低下および全反射面46の部分を低減することを抑制しつつ複数のレンズ面50を形成できる。   This is based on the condition that the dimensions of the light extraction lens 18 in the optical axis direction are the same, and between the lens surfaces 50 adjacent to the connection portion 42 between the adjacent total reflection surfaces 46 of the light extraction lens 18. If formed, the width of the connection portion 42 is narrow and the strength is likely to decrease. If the width of the connection portion 42 is ensured by reducing the total reflection surface 46 portion in order to increase the strength of the connection portion 42, reflection Although the light rate is decreased, the portion of the total reflection surface 46 is not reduced by forming the lens surface 50 in the portion facing the connecting portion 42 between the adjacent total reflection surfaces 46 of the light extraction lens 18. However, the width of the connecting portion 42 can be secured, that is, the plurality of lens surfaces 50 can be formed while suppressing the strength reduction and the reduction of the total reflection surface 46 portion.

なお、光を発する光源部は、発光ダイオードチップと蛍光体との組み合わせだけとは限らず、少なくとも異なる２つ以上の波長域の光を発するものであれば、発光ダイオードチップが２種類以上あっても励起される蛍光体層が２種類以上あっても励起される蛍光体層が２種類以上構成されていてもよい。   The light source unit that emits light is not limited to a combination of a light emitting diode chip and a phosphor, and there are two or more types of light emitting diode chips as long as they emit light in at least two different wavelength ranges. Even if there are two or more types of excited phosphor layers, two or more types of excited phosphor layers may be formed.

本発明の第１の実施の形態を示す照明装置の断面図である。It is sectional drawing of the illuminating device which shows the 1st Embodiment of this invention. 同上照明装置の光取出レンズに入射した青色光および黄色光を入射面および全反射面で平行光とする説明図である。It is explanatory drawing which makes the blue light and yellow light which injected into the light extraction lens of the illumination device same as the above into parallel light in an incident surface and a total reflection surface. 同上照明装置の光取出レンズの各レンズ面から出射する光の説明図である。It is explanatory drawing of the light radiate | emitted from each lens surface of the light extraction lens of an illuminating device same as the above. 同上照明装置の光取出レンズのレンズ面側から見た正面図である。It is the front view seen from the lens surface side of the light extraction lens of an illuminating device same as the above. 同上照明装置の光取出レンズを外した状態の正面図である。It is a front view of the state which removed the light extraction lens of the illuminating device same as the above. 同上照明装置の１つの光源部の断面図である。It is sectional drawing of one light source part of an illuminating device same as the above. 同上照明装置の１つの光源部の蛍光体層を省略した正面図である。It is the front view which abbreviate | omitted the fluorescent substance layer of one light source part of an illuminating device same as the above. 同上照明装置の光取出レンズを用いない場合に１つの光源部から光を照射する照射面での青色光と黄色光との強度分布のグラフである。It is a graph of intensity distribution of blue light and yellow light on the irradiation surface which irradiates light from one light source part when not using the light extraction lens of an illuminating device same as the above. 同上照明装置の光取出レンズを用いた場合に１つの光源部から光を照射する照射面での青色光と黄色光との強度分布のグラフである。It is a graph of intensity distribution of blue light and yellow light on the irradiation surface which irradiates light from one light source part when the light extraction lens of the illumination device is used. 本発明の第２の実施の形態を示す照明装置の一部の断面図である。It is a partial cross section figure of the illuminating device which shows the 2nd Embodiment of this invention.

符号の説明Explanation of symbols

11 照明装置
13 発光ダイオードチップ
18 光取出レンズ
27 蛍光体層
30 光源部
31 発光面
42 接続部
45 入射面
46 全反射面
50 レンズ面
51 白色発光部 11 Lighting equipment
13 Light emitting diode chip
18 Light extraction lens
27 Phosphor layer
30 Light source
31 Light emitting surface
42 Connection
45 Incident surface
46 Total reflection surface
50 Lens surface
51 White light emitting part

Claims (2)

中央部に配設された青色光を発光する発光ダイオードチップ、および発光ダイオードチップの青色光の発光面積よりも大きな発光面積を有し青色光により励起されて黄色光を発光する蛍光体層を備え、青色光および黄色光を放射する発光面が形成された複数の光源部と；
各光源部の発光面から放射される青色光および黄色光の全ての光が入射して平行光とするように各光源部の発光面を包囲する入射面、入射面に対向して設けられ入射した青色光および黄色光を平行光として反射する全反射面、および平行光を集光させて白色発光部を生成する複数のレンズ面を備え、各光源部の照射領域が重なり合うように構成された光取出レンズと；
を具備していることを特徴とする照明装置。 A light emitting diode chip that emits blue light disposed in the center, and a phosphor layer that has a light emitting area larger than the light emitting area of blue light of the light emitting diode chip and emits yellow light when excited by blue light A plurality of light source parts formed with light emitting surfaces for emitting blue light and yellow light;
An incident surface that surrounds the light emitting surface of each light source unit and is opposed to the incident surface so that all light of blue light and yellow light emitted from the light emitting surface of each light source unit is incident and becomes parallel light. With a total reflection surface that reflects blue light and yellow light as parallel light, and a plurality of lens surfaces that collect the parallel light to generate a white light emitting portion, and are configured so that the irradiation areas of each light source portion overlap each other A light extraction lens;
An illumination device comprising: 光取出レンズは、隣り合う一方の光源部に設けられた全反射面と他方の光源部に設けられた全反射面との間に接続部が形成され、接続部に対向する部分にレンズ面が形成されている
ことを特徴とする請求項１記載の照明装置。 In the light extraction lens, a connection portion is formed between a total reflection surface provided in one adjacent light source portion and a total reflection surface provided in the other light source portion, and a lens surface is provided at a portion facing the connection portion. The lighting device according to claim 1, wherein the lighting device is formed.
JP2007005703A 2006-02-28 2007-01-15 Lighting system Pending JP2007265964A (en)

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