JP6758758B2 - Light emitting device - Google Patents
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- JP6758758B2 JP6758758B2 JP2016170146A JP2016170146A JP6758758B2 JP 6758758 B2 JP6758758 B2 JP 6758758B2 JP 2016170146 A JP2016170146 A JP 2016170146A JP 2016170146 A JP2016170146 A JP 2016170146A JP 6758758 B2 JP6758758 B2 JP 6758758B2
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- 230000001939 inductive effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
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Description
本発明は、所定方向に伸長した棒状または帯状の領域を発光させる発光装置に関する。 The present invention relates to a light emitting device that emits light in a rod-shaped or band-shaped region extending in a predetermined direction.
端面に配置した光源から光を入射させ、その光を所定方向に沿って伝搬させ、同方向に伸長した棒状または帯状の領域を略均一な明るさで照明するライドガイド（導光棒または導光板。例えば、下記特許文献を参照）が既知である。ライトガイドは、稠密な樹脂製の棒状材を主体とし、その棒状材の側面に、拡散反射を惹起するための微細な凹凸を形成し、または鏡面反射を惹起するための反射膜やマイクロプリズム等を設けることによって作製される。この種のライトガイドは、近時、車両のヘッドランプ（前照灯）やテールランプ（尾灯）等に用いられつつある。 A ride guide (light guide rod or light guide plate) that injects light from a light source placed on the end face, propagates the light along a predetermined direction, and illuminates a rod-shaped or band-shaped region extending in the same direction with substantially uniform brightness. For example, see the patent document below) is known. The light guide is mainly composed of a dense resin rod-shaped material, and the side surface of the rod-shaped material is formed with fine irregularities for inducing diffuse reflection, or a reflective film or microprism for inducing specular reflection, etc. It is produced by providing. These types of light guides are recently being used for vehicle headlamps (headlights), tail lamps (taillights), and the like.
ライトガイドの径を太くすることには限界がある。ライトガイド単独で車両用の灯具を構成しようとすると、発光する領域の幅が非常に狭くなり、意匠性も低下する。 There is a limit to increasing the diameter of the light guide. If the light guide alone is used to construct a lighting fixture for a vehicle, the width of the light emitting area becomes very narrow and the design is also deteriorated.
発光する領域の幅を広げるには、ライトガイドの前方にアクリルその他の樹脂製の透明または透光性を有するカバーを配置し、そのカバーの内面または外面に、ライトガイドから放たれる光を拡散させるレンズとして作用する形状を成形することが考えられる。しかしながら、光が拡散する分だけ、光の輝度即ち単位面積あたりの光束の量が低下することとなり、必要な輝度を担保するために高性能な照明光源を使用せざるを得なくなる。このことは、コストの高騰、及び車両における電力消費量の増大に繋がる。 To increase the width of the light emitting area, a transparent or translucent cover made of acrylic or other resin is placed in front of the light guide, and the light emitted from the light guide is diffused on the inner or outer surface of the cover. It is conceivable to form a shape that acts as a lens to be made to act. However, the brightness of the light, that is, the amount of the luminous flux per unit area is reduced by the amount of the diffused light, and a high-performance illumination light source must be used to secure the required brightness. This leads to soaring costs and increased power consumption in vehicles.
以上の問題に着目してなされた本発明は、棒状または帯状の領域を発光させる発光装置において、その発光する領域の幅をできるだけ広げながら、必要な方向に向かう光の輝度を高めることを所期の目的とする。 Focusing on the above problems, the present invention is intended to increase the brightness of light in a required direction while widening the width of the light emitting region as much as possible in a light emitting device that emits light in a rod-shaped or band-shaped region. The purpose of.
本発明では、光源から光の入射を受けその光を所定方向に沿って伝搬させて同方向に伸長した棒状または帯状の領域から放射するライトガイドと、前記ライトガイドから放射される光を略平行光に変換するためのコリメートレンズ面を含むレンズ体とを具備し、前記コリメートレンズ面が前記所定方向に沿って複数段の区画に分割されており、同方向に沿って隣接する二つの区画のコリメートレンズ面の形状が同方向と直交する方向に沿ってずれている発光装置を構成した。 In the present invention, a light guide that receives light incident from a light source, propagates the light along a predetermined direction, and emits light from a rod-shaped or band-shaped region extending in the same direction, and light emitted from the light guide are substantially parallel to each other. A lens body including a collimated lens surface for converting into light is provided, and the collimated lens surface is divided into a plurality of stages along the predetermined direction, and two adjacent compartments along the same direction. A light emitting device is configured in which the shape of the collimated lens surface is deviated along a direction orthogonal to the same direction .
本発明によれば、棒状または帯状の領域を発光させる発光装置において、その発光する領域の幅をできるだけ広げながら、必要な方向に向かう光の輝度を高めることができる。 According to the present invention, in a light emitting device that emits light in a rod-shaped or band-shaped region, it is possible to increase the brightness of light in a required direction while widening the width of the light emitting region as much as possible.
本発明の一実施形態を、図面を参照して説明する。図１に、本実施形態の発光装置１の使用例である車両用灯具を示している。このものは、車体の後部に設置されるテールランプであり、図１（Ａ）は消灯している状態、図１（Ｂ）は点灯している状態である。本実施形態の発光装置１は、ちょうどＬ字形をなすように伸長した、棒状または帯状の領域を発光させる。 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a vehicle lamp that is an example of using the light emitting device 1 of the present embodiment. This is a tail lamp installed at the rear of the vehicle body, in which FIG. 1 (A) is off and FIG. 1 (B) is on. The light emitting device 1 of the present embodiment emits light in a rod-shaped or band-shaped region extending so as to form an L-shape.
図２及び図３に、本実施形態の発光装置１の構造を示す。なお、本発光装置１が出力する光５の光束の一部を、図中に破線で表している。本発光装置１は、光源４から光５の入射を受け、その入射した光５を伝搬させながら面発光するように放射するライトガイド２と、ライトガイド２の前方（車両の前後を基準とすれば、後方）に所在し、ライトガイド２から放射される光５を略平行光に変換するためのコリメートレンズ面３０を含むレンズ体３とを具備する。 2 and 3 show the structure of the light emitting device 1 of the present embodiment. A part of the luminous flux of the light 5 output by the light emitting device 1 is represented by a broken line in the figure. The light emitting device 1 receives the incident light 5 from the light source 4 and radiates the incident light 5 so as to emit light while propagating the incident light 5, and the light guide 2 in front of the light guide 2 (with reference to the front and rear of the vehicle). For example, it is located behind) and includes a lens body 3 including a collimating lens surface 30 for converting light 5 emitted from the light guide 2 into substantially parallel light.
ライトガイド２は、上下方向に伸長し、かつその下端部において車両の内側方に向かって湾曲した形状をなしている。ライトガイド２自体は、既存のそれと同様の性質を有する。即ち、このライトガイド２は、稠密かつ透明な樹脂製の棒状材を主体とし、その棒状材の後面（車両の前後を基準とすれば、前面）に、拡散反射を惹起するための微細な凹凸２１を形成している、または鏡面反射を惹起するための反射膜やマイクロプリズム等を設けているものである。 The light guide 2 extends in the vertical direction and has a shape curved toward the inside of the vehicle at the lower end thereof. The light guide 2 itself has properties similar to those of the existing one. That is, the light guide 2 is mainly composed of a dense and transparent resin rod-shaped material, and the rear surface of the rod-shaped material (the front surface when the front and rear of the vehicle is used as a reference) has fine irregularities for inducing diffuse reflection. 21 is formed, or a reflective film, a microprism, or the like for inducing specular reflection is provided.
発光装置１の光源４、例えば発光ダイオードが出力する光５は、ライトガイド２の上端側の端面２０からライトガイド２内に入射する。入射した光５は、ライトガイド２の伸長する方向に沿ってライトガイド２内を伝搬する。その間、この光５は、ライトガイド２の後面側の微細な凹凸２１により拡散反射し、または反射膜やマイクロプリズム等により鏡面反射して、ライトガイド２内からライトガイド２の前方に向かって出射し、当該ライトガイド２の前面を略均一な輝度で面発光させる。 The light source 4 of the light emitting device 1, for example, the light 5 output by the light emitting diode, enters the light guide 2 from the end surface 20 on the upper end side of the light guide 2. The incident light 5 propagates in the light guide 2 along the extending direction of the light guide 2. During that time, the light 5 is diffusely reflected by the fine irregularities 21 on the rear surface side of the light guide 2, or specularly reflected by a reflective film, a microprism, or the like, and is emitted from the inside of the light guide 2 toward the front of the light guide 2. Then, the front surface of the light guide 2 is surface-emitted with substantially uniform brightness.
レンズ体３は、ライトガイド２の前方を覆うカバーである。レンズ体３は、透明または透光性を有する樹脂製の板状体を主体とし、その板状体におけるライトガイド２と対向する内面（車両の前後を基準とすれば、前面）に、ライトガイド２から出射する光５を通過させるコリメートレンズ面３０を形成している。図３に示すように、コリメートレンズ面３０は、いわゆるフレネルレンズまたはこれに近いような横断面形状をなし、線光源４であるライトガイド２から前方に放たれた光５を略平行光に変換する作用を営む。但し、完全な平行光線を作るわけではなく、ある程度は光５を拡散させる。 The lens body 3 is a cover that covers the front of the light guide 2. The lens body 3 is mainly composed of a transparent or translucent resin plate-shaped body, and a light guide is provided on an inner surface (front surface based on the front and rear of the vehicle) of the plate-shaped body facing the light guide 2. A collimating lens surface 30 through which the light 5 emitted from the 2 is passed is formed. As shown in FIG. 3, the collimating lens surface 30 has a cross-sectional shape similar to that of a so-called Fresnel lens, and converts the light 5 emitted forward from the light guide 2 which is the line light source 4 into substantially parallel light. Performs the action of However, it does not create perfectly parallel rays, but diffuses the light 5 to some extent.
しかして、本実施形態では、図２及び図４に示すように、レンズ体３におけるコリメートレンズ面３０を、ライトガイド２の伸長方向に沿って多数段の区画３１、３２に分割している。ライトガイド２の伸長方向に沿って並ぶ奇数段３１のコリメートレンズ面３０の横断面形状は、互いに等しいか略等しい。ライトガイド２の伸長方向に沿って並ぶ偶数段３２のコリメートレンズ面３０の横断面形状もまた、互いに等しいか略等しい。一方で、偶数段３２のコリメートレンズ面３０となるフレネルレンズの（光５の屈折面として働く）各部分は、奇数段３１のコリメートレンズ面３０となるフレネルレンズの各部分と比較して、その位置がライトガイド２の伸長方向と直交する方向に沿ってずれている。従って、ライトガイド２の伸長方向に沿って隣接する二つの区画３１、３２のコリメートレンズ面３０の横断面形状は、相違している。 Thus, in the present embodiment, as shown in FIGS. 2 and 4, the collimated lens surface 30 in the lens body 3 is divided into a plurality of stages 31 and 32 along the extension direction of the light guide 2. The cross-sectional shapes of the collimated lens surfaces 30 of the odd-numbered stages 31 arranged along the extension direction of the light guide 2 are equal to or substantially equal to each other. The cross-sectional shapes of the even-numbered steps 32 collimated lens surfaces 30 arranged along the extension direction of the light guide 2 are also equal to or substantially equal to each other. On the other hand, each part of the Fresnel lens (which acts as a refracting surface of the light 5) which is the collimated lens surface 30 of the even-numbered stage 32 is compared with each part of the Fresnel lens which is the collimated lens surface 30 of the odd-numbered stage 31. The position is shifted along the direction orthogonal to the extension direction of the light guide 2. Therefore, the cross-sectional shapes of the collimated lens surfaces 30 of the two adjacent compartments 31 and 32 along the extension direction of the light guide 2 are different.
また、図２に示しているように、ライトガイド２の伸長方向に沿って並ぶ各段３１、３２のコリメートレンズ面３０の縦断面形状は、当該コリメートレンズ面３０を通過してレンズ体３の前方に放たれる光５の光軸が水平方向または斜め上方向を向くように成形してある。 Further, as shown in FIG. 2, the vertical cross-sectional shape of the collimated lens surfaces 30 of the stages 31 and 32 arranged along the extension direction of the light guide 2 passes through the collimated lens surface 30 of the lens body 3. It is molded so that the optical axis of the light 5 emitted forward faces horizontally or diagonally upward.
本実施形態では、光源４から光５の入射を受けその光５を所定方向に沿って伝搬させて同方向に伸長した棒状または帯状の領域から放射するライトガイド２と、前記ライトガイド２から放射される光５を略平行光に変換するためのコリメートレンズ面３０を含むレンズ体３とを具備し、前記コリメートレンズ面３０が前記所定方向に沿って複数段の区画３１、３２に分割されており、同方向に沿って隣接する二つの区画３１、３２のコリメートレンズ面３０の形状が相違している発光装置１を構成した。 In the present embodiment, a light guide 2 that receives light 5 from a light source 4 and propagates the light 5 along a predetermined direction and radiates it from a rod-shaped or band-shaped region extending in the same direction, and radiates from the light guide 2. A lens body 3 including a collimating lens surface 30 for converting the light 5 to be substantially parallel light is provided, and the collimating lens surface 30 is divided into a plurality of stages 31 and 32 along the predetermined direction. The light emitting device 1 is configured in which the shapes of the collimated lens surfaces 30 of the two adjacent compartments 31 and 32 are different along the same direction.
本実施形態によれば、ライトガイド２から放たれる光５をコリメートレンズ面３０を有したレンズ体３により整形することで、発光する棒状または帯状の領域の幅を拡張しながら、必要な方向に向かう光５の輝度を高めることができる。従って、高輝度・高性能な光源４を使用する必要から開放され、コストの削減、及び車両における電力消費量の抑制に寄与し得る。 According to the present embodiment, the light 5 emitted from the light guide 2 is shaped by the lens body 3 having the collimating lens surface 30, so that the width of the light emitting rod-shaped or band-shaped region is expanded and the direction is required. It is possible to increase the brightness of the light 5 toward the light 5. Therefore, it is possible to avoid the need to use the high-brightness and high-performance light source 4, and to contribute to cost reduction and reduction of power consumption in the vehicle.
加えて、レンズ体３のコリメートレンズ面３０を、ライトガイド２の伸長方向に沿って複数段の区画３１、３２に分割していることから、ライトガイド２の伸長方向に沿って一貫して連続した等断面形状のコリメートレンズ（フレネルレンズ）面を形成する場合と比較して、レンズ体３において同伸長方向に沿った筋が目立ってしまう不具合が生じず、レンズ体３を介して棒状のライトガイド２が露骨に透けて目立ってしまうことも抑制される。つまり、光源４を消灯し発光装置１を発光させていないときの見栄えがよい。さらに、光源４を点灯して発光装置１を発光させる際にも、細かいセグメントに分割されたコリメートレンズ面３０の存在により、ちょうど反射板の如く無数のセグメントが一様に発光している様相を呈することとなり、意匠性が向上する。 In addition, since the collimated lens surface 30 of the lens body 3 is divided into a plurality of stages 31 and 32 along the extension direction of the light guide 2, it is consistently continuous along the extension direction of the light guide 2. Compared with the case of forming a collimated lens (Fresnel lens) surface having an equisection shape, there is no problem that streaks along the same extension direction are conspicuous in the lens body 3, and a rod-shaped light is formed through the lens body 3. It is also suppressed that the guide 2 is blatantly transparent and conspicuous. That is, the appearance is good when the light source 4 is turned off and the light emitting device 1 is not made to emit light. Further, even when the light source 4 is turned on to cause the light emitting device 1 to emit light, the presence of the collimating lens surface 30 divided into fine segments makes it possible for innumerable segments to emit light uniformly just like a reflector. It will be presented and the design will be improved.
レンズ体３は、ライトガイド２そのものの発光のむら、即ちライトガイド２から出射する光束の量や向きの偏りを吸収し、発光装置１としての発光の一様性を向上させる。ライトガイド２を複雑な形状にする必要はなく、ライトガイド２の重量を軽減することも可能となる。 The lens body 3 absorbs uneven light emission of the light guide 2 itself, that is, bias in the amount and direction of the light flux emitted from the light guide 2, and improves the uniformity of light emission as the light emitting device 1. The light guide 2 does not need to have a complicated shape, and the weight of the light guide 2 can be reduced.
なお、本発明は以上に詳述した実施形態に限られるものではない。例えば、本発明の適用対象は、車両のテールランプには限定されない。 The present invention is not limited to the embodiments described in detail above. For example, the application of the present invention is not limited to the tail lamp of a vehicle.
その他、各部の具体的な構成は、本発明の趣旨を逸脱しない範囲で種々変形が可能である。 In addition, the specific configuration of each part can be variously modified without departing from the spirit of the present invention.
本発明は、車両用の灯具等に適用することができる。 The present invention can be applied to lighting fixtures for vehicles and the like.
１…発光装置
２…ライトガイド
３…レンズ体
３０…コリメートレンズ面
３１、３２…複数段の区画
４…光源
５…光
1 ... Light emitting device 2 ... Light guide 3 ... Lens body 30 ... Collimated lens surface 31, 32 ... Multiple stages 4 ... Light source 5 ... Light
Claims (1)
前記ライトガイドから放射される光を略平行光に変換するためのコリメートレンズ面を含むレンズ体とを具備し、
前記コリメートレンズ面が前記所定方向に沿って複数段の区画に分割されており、同方向に沿って隣接する二つの区画のコリメートレンズ面の形状が同方向と直交する方向に沿ってずれている発光装置。 A light guide that receives light incident from a light source, propagates the light along a predetermined direction, and radiates it from a rod-shaped or band-shaped region extending in the same direction.
A lens body including a collimated lens surface for converting light radiated from the light guide into substantially parallel light is provided.
The collimated lens surface is divided into a plurality of sections along the predetermined direction, and the shapes of the collimated lens surfaces of the two adjacent sections along the same direction are deviated along the direction orthogonal to the same direction. Light emitting device.
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| JP2010198992A (en) * | 2009-02-26 | 2010-09-09 | Three M Innovative Properties Co | Plane light-emitting device and vehicular lighting device |
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