JP2001351424A - Plane light-emitting device - Google Patents

Plane light-emitting device

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Publication number
JP2001351424A
JP2001351424A JP2000168681A JP2000168681A JP2001351424A JP 2001351424 A JP2001351424 A JP 2001351424A JP 2000168681 A JP2000168681 A JP 2000168681A JP 2000168681 A JP2000168681 A JP 2000168681A JP 2001351424 A JP2001351424 A JP 2001351424A
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Prior art keywords
lens
light
surface
led
light source
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JP2000168681A
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Japanese (ja)
Inventor
Kazutomo Oishi
Yoshi Sotokawa
Tatsufumi Yagi
達史 八木
善 外河
一智 大石
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Fuji Electric Ind Co Ltd
不二電機工業株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a plane light-emitting device, thin yet with superb uniformity of extremely bright plane illumination with a light source arranged on a plane.
SOLUTION: With the plane light-emitting device with one or a plurality of light sources arranged on a plane and a lens placed in front of the light source(s), the irradiating face side of the lens in the light source axis is dented toward the light sources side so that light from the specific spot where the light source is placed is completely reflected.
COPYRIGHT: (C)2001,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、LED(発光ダイオード)を用いた表示灯を含む平面発光装置に関し、特に、フラットでかつ均一性に優れ、明るい照光を実現し、全反射レンズの設計やLED表示灯を含む平面発光装置に関するものである。 BACKGROUND OF THE INVENTION The present invention relates to a planar light-emitting device comprising a display lamp using an LED (light emitting diode), in particular, excellent in flat and uniform properties, to realize a bright illumination, Ya design of the total reflection lens it relates plane light emitting device including an LED indicator light.

【0002】 [0002]

【従来の技術】従来の点光源を複数個用いた表示灯や平面発光装置では、光源を面の横側に配置し、全反射を利用して拡散面に光を照射して均一な光源を実現する方式が広く用いられている。 In conventional lights, flat light emitting device using a plurality of point light source, a light source disposed on the side surface, a uniform light source irradiating light to the diffusion surface by utilizing total reflection method for realizing is widely used. この方式は、光源を横側に配置するので、光源の配置数に制限があり、LEDを配置する部分は照光面にできず照光面積が小さくなる。 This method is therefore to place the light source on the lateral side, there is a limit to the arrangement of light sources, portions of placing the LED is the illuminated area can not in illumination surface is reduced.

【0003】一方、平面上にLEDを配置して光源とする場合には、LEDの配置がそのままムラとなり、点光源の配置ピッチ以上拡散板を離して配置し、各点光源のムラを解消することが行われている。 [0003] On the other hand, when the light source is arranged LED on a plane, the arrangement of the LED is directly becomes uneven, and spaced apart more than the arrangement pitch diffuser of the point light source, to eliminate the unevenness of the point light sources it is being carried out. この場合、光源と発光面の距離が長くなり、装置が大きくなる欠点を有している。 In this case, the distance between the light source and the light-emitting surface is long, has the drawback that device is increased.

【0004】また、ムラを解消するために拡散板の厚さを増したり、透過率を下げることも行われているが、これでは輝度を犠牲にしてムラを解消することになる。 [0004] or increase the thickness of the diffusion plate in order to eliminate the unevenness, but also have been made to lower the transmittance, thus to eliminate the non-uniformity at the expense of brightness in this.

【0005】これを改善するために、点光源であるLE [0005] In order to improve this, LE is a point light source
Dを透明樹脂でポッティング(埋める)して、ある厚さの前面レンズを形成することが行われている。 D and potting (fill) in the transparent resin, being performed to form the front lens of a certain thickness. これにより点光源からの光のうち、臨界角以上の光はレンズ出射面で全反射すると共に、臨界角以内の光は出射面で外側に拡散し、結果的に拡散板の位置を光源に近づけてもムラが目立ちにくい構成ができる。 Thus among the light from the point light source, the light of the above critical angle while totally reflected at the lens exit surface, the light within the critical angle will diffuse outwardly emitting surface, resulting in closer the position of the diffuser plate to the light source can be configured to be less noticeable unevenness is.

【0006】この方式の欠点は、透明樹脂によるLED [0006] The disadvantage of this method is, LED by the transparent resin
のポッティングに装置、コストがかかり、その割りには大幅な小型化ができないことである。 Device to potting, costly, and its split is the inability to be greatly miniaturized.

【0007】図3は、平面上に複数個のLED101を配置し、拡散板102を照光する表示灯である。 [0007] Figure 3, a plurality of LED101 arranged on a plane, which is a display lamp that illuminates a diffusing plate 102. この表示灯では照光面でのムラを無くするためには拡散板10 The diffusion plate 10 in order to eliminate the unevenness on the illuminating surface by this indicator
2と距離をとる必要があり、A面では距離が長い、高さの高いものになっている。 Must take 2 and the distance, the distance in the A face is long, it has a tall ones. しかし、B面では光のムラが多い。 However, unevenness of light is large in the B side.

【0008】図4は、図3の表示灯を改善する従来例であり、LED201の表面を一定厚さの透明な材料20 [0008] Figure 4 is a prior art for improving the indicator of Figure 3, a transparent material having a predetermined thickness to the surface of the LED 201 20
3でポッティングする構成を示している。 It shows a configuration of the potting at 3. この構成では臨界角より大きな角度で入射する光は全反射を起こし、 Light incident at an angle greater than the critical angle for this configuration undergoes a total reflection,
LED側拡散面を照光すると共に、臨界角以内の光は発散光となり、外部の拡散板202に向かう。 While illuminating the LED side diffusion surface, the light within the critical angle becomes divergent light toward the outside of the diffusion plate 202.

【0009】しかしながら、図4の従来例では、臨界角以内の光が直接外部に向かうため、拡散面を拡げるか、 However, if the conventional example of FIG. 4, the light within the critical angle is directly towards the outside, widening the diffusion surface,
拡散板202の透過率を下げる(暗くする)などしてムラを解消しなければならないことに変わりはない。 The transmittance of the diffusion plate 202 lowers (darkening) the fact remains that it must eliminate the unevenness and the like.

【0010】この図4の従来例は、図3の従来例に比較して拡散板202までの距離を短くすることはできるが、ある程度の距離が必要であり、コストの割りには薄型化という点で不十分である。 Conventionally example of Figure 4, although it is possible to shorten the distance to the diffuser plate 202 as compared with the conventional example of FIG. 3, it is necessary to a certain distance, that thin in spite of the cost it is insufficient in point.

【0011】 [0011]

【発明が解決しようとする課題】ところで、本発明は、 The object of the invention is to be Solved by the way, the present invention is,
上記の事情に鑑み、LEDを平面上に配置し、極めて明るく、薄型でありながら面照光の均一性に優れた平面発光装置を提供しようとするものである。 In view of the above circumstances, the LED is arranged on a plane, it is intended to provide a very bright, flat light emitting device having excellent uniformity of surface illumination, yet thin.

【0012】 [0012]

【課題を解決するための手段】一般に、この種の照光面のムラや不均一は、拡散板への入射光が不均一であることが直接原因となっている。 Generally SUMMARY OF THE INVENTION, unevenness and nonuniformity of illumination surface of this kind, it incident light on the diffusing plate is not uniform are caused directly. これは光源が複数であり、 This light source is plural,
光源からの集中的な光が不均一さを生じているからである。 Intensive light from the light source is because they cause unevenness. この均一性と相反する関係にある明るさと大きさ(光源と拡散板の距離)の問題を解決する手段を提供しなければならない。 This uniformity to be inversely related brightness and size must provide a means for solving the (light source and the distance of the diffuser) in question.

【0013】課題を解決するためには、集中的な光を直接拡散板に入射させないことであり、そのための技術手段として全反射の原理と拡散板からの間接照明の手段を用いる。 [0013] In order to solve the problem is that it is not allowed to be incident intensive light directly diffusing plate, using means of indirect illumination from the principles and the diffuser of the total reflection as a technical means therefor.

【0014】直接入射を防止するために直接光を遮光する手段が考えられるが、光はいつかは表面に出ていって拡散板を照光しなければならないので、あらゆる角度から見ても直接光が漏れないような遮光は、反射光の光路を減少させ輝度を著しく低下させる結果となる。 [0014] While direct incident means for shielding a direct light to prevent the possible, since light must illuminate the diffusing plate go out to the surface sometime, direct light even when viewed from any angle shading that does not leak, resulting in significantly reducing the luminance to reduce the optical path of the reflected light.

【0015】本発明で採用する全反射は、透明な媒体の表面で起こる現象であり、レンズの設計によって特定の1点(光源)からの光は全反射を起こすが、その他の部分からの光は遮光されることなく透過させることができる利点を有する。 [0015] The total reflection employed in the present invention is a phenomenon that occurs on the surface of the transparent medium, light from a particular point (light source) by the design of the lens which results in total reflection, but light from the other portions It has the advantage of being able to transmit without is blocked.

【0016】すなわち、本レンズを通してLED側を見た場合、あらゆる角度からも光源であるLEDは見えないが、LED以外の面が明るく照光されている結果が得られる。 [0016] That is, when viewed LED side throughout the lens, but LED is not visible as a light source from all angles, as a result of a surface other than the LED is brightly illuminated is obtained.

【0017】全反射された光は発散し、LED光源側に設けられた反射率の高い拡散面に当たり、この面が照光される。 The light totally reflected diverge, strikes the high diffusion surface reflectance provided in the LED light source side, this surface is illuminated. いわば、点光源が面光源に変換されることになる。 So to speak, so that the point light source is converted into a surface light source.

【0018】このことは、集中した光束を避けると共に、従来の拡散面がLEDと同じ面(即ち離隔距離= [0018] This means that, along with avoiding light beam focused, the same surface (i.e. distance conventional diffusion surface and LED =
0)に第1の拡散面を形成したことになり、拡散面が限りなくLED光源面に近づき、全長の短縮に効果がある。 0) it will be the formation of the first diffusion surface, close to the LED light source surface as possible diffusion surface is effective in reducing the total length.

【0019】この第1拡散面(LED光源面)で充分な均一性が得られる設計をすれば、レンズ出射面側には拡散板を置く必要もない。 [0019] If a design that sufficient uniformity in the first diffusion surface (LED light source plane) is obtained, the lens exit surface is not necessary to place the diffuser plate.

【0020】更に均一性を求める場合には、レンズの厚さを介して第2の拡散板を設け、レンズの厚さ部分で同時に拡散させることとなり、この空間は反射、拡散が同時に行われ、スペースを少なくし、極めてスペースファクターの優れたものとなる。 [0020] When the further determine the uniformity, the second diffusion plate is provided through the thickness of the lens, will be simultaneously diffused in the thickness portion of the lens, the space reflection, diffusion is carried out at the same time, with less space, and it is excellent in the extremely space factor.

【0021】即ち、全反射レンズによる点光源から面光源への変換という手段が均一性と小型化を同時に実現する最良の解となる。 [0021] That is, means that the conversion to a surface light source from a point source due to the total reflection lens is the best solution for realizing simultaneously uniformity and compactness.

【0022】さらに、本発明では、LEDとレンズの配置のズレなどによる直接光の漏れに対しても裕度のある装置を提供するため、LEDを収納する面の形状をコーン上にして予め全反射が起こりやすい形状とする。 Furthermore, in the present invention, to provide a margin of device against leakage of direct light due to displacement of the arrangement of the LED and the lens, previously the shape of the surface for accommodating the LED and on the cone all reflection and prone shape.

【0023】 [0023]

【発明の実施の態様】本発明を表示灯を例にとって添付する図面に示す具体的な実施例に基づいて、以下詳細に説明する。 Based on the specific examples shown in the accompanying drawings as an example indicator of the present invention aspects of the practice of the invention, it will be described in detail.

【0024】本発明は、上記に含まれる問題を解決する手段を提供するもので、具体的な構成例を図1に示す。 The present invention is intended to provide a means for solving the problems involved in the above, a specific configuration example in FIG.
本発明のLED1と前面に配置するレンズ2の関係を拡大して図2に示す。 2 an enlarged relationship LED1 and lens 2 disposed in front of the present invention.

【0025】図1においては、臨界角以外の光のみならず、臨界角以内の光も直接レンズ2を透過させず、全反射させてLED側拡散面3を照光させる。 [0025] In FIG. 1, not only the light other than the critical angle, no light is transmitted also directly lens 2 within the critical angle, total reflection is caused to illuminate the LED side diffusing surface 3. 拡散面3に当たった光は臨界角以内の光の殆どがレンズ2を透過する。 Light striking the diffusing surface 3 most of the light within the critical angle passes through the lens 2. 即ち、レンズ面が構成する特異点(LED配置点) That is, singularity lens surfaces constituting (LED constellation points)
からの光は透過させず、その他の面からの光は殆どを透過する構成のレンズを採用する。 Light from does not transmit, the light from the other surface to adopt a configuration of a lens that transmits most.

【0026】図2において、その具体的なレンズ構成を説明する。 [0026] In FIG. 2, illustrating the specific lens configuration. 本発明の特徴はLED1の光軸上の高屈折率側をコーン状凹み4に凹ました構成とする。 Feature of the present invention is a structure in which Hekomashi a high refractive index side of the optical axis of the LED1 conically recessed 4.

【0027】典型的な例で説明すれば、コーン状凹み4 [0027] will be described in a typical example, dents conical 4
の外側を臨界角に対応した点に一致させておけば、臨界角より大きな光は平面で従来どおり全反射し、臨界角以内の光はコーン状凹み4の傾斜を全反射が起こるように設定すればこれも全反射を起こし、全ての直接光が外部に漏れない構成となる。 Configuring the outer if made coincident to the point corresponding to the critical angle, so large light than the critical angle is totally reflected conventionally flat, light within the critical angle total internal reflection occurs an inclination of the conical recess 4 This also causes a total reflection if, all direct light is configured to not leak to the outside.

【0028】工業的に安定に全反射を実現するためには、組立てのバラツキを考慮しなければならない。 [0028] To achieve the industrially stable total reflection must consider the variation of the assembly.

【0029】即ち、LED1の配置点やレンズ2の位置のバラツキにより、一部の調節光が外部に漏れては意図するところが実現しない。 [0029] That is, the variation in the position of the alignment point and the lens 2 of the LED1, do not realize the intent is part of the regulatory light leaks to the outside. このため、上記典型的な例に対してコーン状凹み4の傾斜を更に強くするとか、コーン状凹み4の外径を大きくするなど多少のバラツキに対して裕度のあるレンズの設計が望ましい。 Therefore, Toka further strongly inclined cone-shaped recess 4 against the typical example, it is desirable design of a lens of tolerance with respect to some variations such as increasing the outer diameter of the cone-shaped recess 4.

【0030】これをコーン状凹み4のレンズ部分のみで実現しようとすると、レンズ2の厚さが厚くなる、隣接する光源からコーン状凹み4へ入射する光がもれるなどの不具合を生じる。 [0030] If this is to be realized only in lenses part of the conical recess 4, the thickness of the lens 2 is increased, resulting in troubles such as leaking light incident from adjacent light sources into a cone-shaped recess 4. これを解決するために、図2に示した例はLED周辺に光軸に対して更に光が発散する面を配して、全反射が起こりやすい前処理を行っている。 To solve this problem, the example shown in Figure 2 by arranging a surface further light on the optical axis to the peripheral LED diverges, doing total reflection prone pretreatment.

【0031】このように直接光は全反射させて、LED The light thus direct by total reflection, LED
側拡散面3に拡散させたので、図4に示した例に対して、拡散面3が一挙にLED1の配置面まで下がった結果となり、本質的に全長が短縮される。 Since it was diffused to the side diffusing surface 3, for the example shown in FIG. 4, the diffusing surface 3 at a stroke results in drops to the arrangement surface of the LED1, essentially the entire length is shortened. 実際にはレンズ2をLED1の前面に配置しても全高をこの厚さ以下とすることはできないが、LED側拡散面3での照光パターン(各ノードパターンの重ね合わせ)が均一であれば、レンズ前面に拡散板を配することなく極めて薄型の平面配置LED平面光源を実現できる。 Although in practice can not be less the thickness of the overall height be arranged lens 2 on the front of the LED1, if illumination pattern of the LED side diffusing surface 3 (superposition of each node pattern) is uniform, very without the lens front arranging the diffusion plate can realize a thin planar arrangement LED plane light sources.

【0032】問題は、LED側での照光パターンであるが、これは光線追跡と各ノードパターンの重ね合わせのコンピュータシュミレーションにより、予めLEDピッチやレンズ形状による最適設計をすることができる。 The problem is the illumination pattern of the LED side, which can be a computer simulation of the superposition of ray tracing and each node pattern, an optimal design by previously LED pitch or lens shape.

【0033】パターンの最適設計でも若干のムラがあり、これを解消したい場合には、図1に示すように、極めて薄い拡散板5をレンズ2の表面に配すれば、LED [0033] There is some irregularity in the optimum design of the pattern, if you want to solve this, as shown in FIG. 1, if Haisure 5 very thin diffusion plate on the surface of the lens 2, LED
1の拡散面3での面光源を更にレンズ2の厚さ分で拡散させたことになり極めて均一性の優れた照光面が得られることはもちろんである。 That excellent illumination surface very uniformity will be allowed to diffuse in addition the thickness of the lens 2 surface light source in the first diffusion surface 3 is obtained, as a matter of course.

【0034】 [0034]

【発明の効果】本発明は、上述のように、複数の点光源の各光軸上前面に全反射レンズを配したから、点光源が面光源に変換され、かつ拡散距離が反射レンズ内でとれるため極めて薄い平面発光装置を提供できる。 According to the present invention, as described above, because we arranged total internal reflection lens on the front surface the optical axes of the plurality of point light sources, the point light source is converted into a surface light source, and diffusion length in the reflective lens It can provide an extremely thin planar light emitting apparatus for take.

【0035】また、面光源であるため、極めて均一性のよい照光面を形成することができる。 Further, since a surface light source, it is possible to form a very uniform with good illumination surface. この結果、表示灯の全長を短縮することができ、スペースを小さくし、装置のスペースファクターを改善できる。 As a result, it is possible to shorten the overall length of the indicator, to reduce the space, can improve the space factor of the apparatus. また、取付パネル面からの表示部の高さを短くでき、フラットな外観をもつパネルを提供できる。 Also, the height of the display unit from the mounting panel surface can be shortened, it is possible to provide a panel having a flat appearance.

【0036】さらに、本発明は、表示灯に限らず、平面照光を必要とする装置に広く適用でき、同様の効果を発揮できる。 Furthermore, the present invention is not limited to a display lamp, widely applicable to devices that require planar illumination can exhibit the same effect.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の具体的一実施例の表示灯の模式図である。 1 is a schematic view of a display lamp of a specific embodiment of the present invention.

【図2】図1の要部の拡大図である。 FIG. 2 is an enlarged view of a main part of Figure 1.

【図3】従来の表示灯の模式図である。 3 is a schematic view of a conventional indicator.

【図4】従来の他の表示灯の模式図である。 4 is a schematic diagram of another conventional indicator.

【符号の説明】 DESCRIPTION OF SYMBOLS

1…LED 2…レンズ 3…LED側拡散面 4…コーン状の凹み 5…拡散板 1 ... LED 2 ... Lens 3 ... LED side diffusion surface 4 ... conical recess 5 ... diffuser plate

───────────────────────────────────────────────────── フロントページの続き (72)発明者 大石 一智 滋賀県草津市野村3丁目4の1 不二電機 工業株式会社 ────────────────────────────────────────────────── ─── of the front page continued (72) inventor Oishi IchiSatoshi 1 of Kusatsu City, Shiga Prefecture Nomura 3-chome, 4 Fuji electric industry Co., Ltd.

Claims (7)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 光源を1個または複数個、同一平面上に配置し、光源前面にレンズを配置した平面発光装置において、前記レンズは光源が配置された特定点からの光を全反射させるように、光源発光軸のレンズ出射面側を光源側に凹ませたことを特徴とする平面発光装置。 [Claim 1] arranged light sources one or more, on the same plane, the plane light emitting device arranged lenses on the light source front, the lens so as to totally reflect the light from a particular point light source is disposed the planar light emitting device is characterized in that the lens output surface side of the light source light-emitting axis is recessed toward the light source.
  2. 【請求項2】 LEDを1個または複数個、同一面上に配置し、LED前面にレンズを配置した表示灯において、上記レンズはLEDが配置された特定点からの光を全反射させるように、LED発光軸のレンズ出射面側をLED光源側に凹ませたことを特徴とする表示灯。 Wherein placing the LED on one or more, same surface, in a display lamp arranged a lens LED front, as the lens is totally reflects the light from a particular point LED is arranged , indicator lamp, characterized in that the lens emission surface side of the LED light-emitting axis is recessed to the LED light source side.
  3. 【請求項3】 複数個のLED前面のレンズは複数個が一体化されたものであり、各々がコーン状凹みの全反射面を有し、拡散面をLED配置側に有することを特徴とする請求項2記載の表示灯。 3. A plurality of LED front surface of the lens are those plurality are integrated, each having a total reflection surface of the cone-shaped recess, and having a diffusing surface to the LED disposed side indicator of claim 2 wherein.
  4. 【請求項4】 レンズの出射側の表面近傍にフィルム拡散板を隣接させ、または直接レンズ表面を粗にした拡散面を有した拡散距離の極めて短いことを特徴とする請求項2記載の表示灯。 Wherein in the vicinity of the surface of the exit side of the lens to be adjacent the film diffuser or indicator of claim 2, wherein the very short diffusion distances having a diffusion surface that directly lens surface roughness .
  5. 【請求項5】 請求項2の拡散面を有する全反射レンズのみで別の拡散板を持たない表示灯。 5. The indicator without a separate diffuser plate only at the total reflection lens having a diffusion surface according to claim 2.
  6. 【請求項6】 LED光源とレンズの結合部がLEDを取り巻くコーン状の低屈折率媒体(空気を含む)で形成したことを特徴とする光源用レンズ構体。 6. The light source lens structure of coupling portions of the LED light source and the lens is characterized in that it is formed in a cone shape of the low refractive index medium surrounding the LED (including air).
  7. 【請求項7】 請求項2のレンズを光拡散性の媒質で形成した全反射レンズ構体。 7. A total reflection lens structure of the lens according to claim 2 and formed of a light diffusing medium.
JP2000168681A 2000-06-06 2000-06-06 Plane light-emitting device Pending JP2001351424A (en)

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