JP2010177196A - Illumination device - Google Patents

Illumination device Download PDF

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JP2010177196A
JP2010177196A JP2010050333A JP2010050333A JP2010177196A JP 2010177196 A JP2010177196 A JP 2010177196A JP 2010050333 A JP2010050333 A JP 2010050333A JP 2010050333 A JP2010050333 A JP 2010050333A JP 2010177196 A JP2010177196 A JP 2010177196A
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light
pair
light source
directional
planar
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JP4737337B2 (en
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Hironori Taguchi
裕規 田口
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Lecip Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device in which surface-like light emission of a surface-like light transmission part can be carried out without using a light guide plate even if in the case a directive light source is arranged at the end part of a pair of surface-like light transmission part to use this as the light source. <P>SOLUTION: On both ends of interior of flat face-shaped lens 13 which is at a pair of light exit of an illumination fixture 2, LEDs 17 as an illumination light source are vertically arranged. On the rear face of the lens 13, a light diffusion film 22 capable of having both light diffusion function and reflection function in combination is mounted. Moreover, a pair of light diffusion films 22 are mounted at the opposing position in parallel in a state of having a spacing. Irradiating light of the LEDs 17 is guided in an irradiation direction while being mutually reflected-back between the pair of light diffusion films, and by diffusion effect of the light diffusion film 22, diffused in the orthogonal direction to the irradiation direction of light, and surface emission from the lens 13 is carried out. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、照射光が指向性を持つ指向性光源を照明光源として持ち、この光源の照射光を面状光透過部に導いて、発光面からの面発光により照明を行う照明装置に関する。   The present invention relates to an illuminating device that has a directional light source having directional light as an illumination light source, guides the light emitted from the light source to a planar light transmitting portion, and performs illumination by surface light emission from a light emitting surface.

従来、光源として発光ダイオード（ＬＥＤ：Light Emitting Diode）を用いた照明装置としては、例えば照明装置の発光面（面状光透過部）をカバーとしてこの内部に複数のＬＥＤを発光面に対して水平方向に並べて配置し、これらＬＥＤの光（発光部分）を、光の出口である発光面から外部に導出することにより、発光面から光を外部に照射する構成をとるものが主流である。しかし、この照明装置は、ＬＥＤが点灯状態をとった際、外部からこの照明装置を観察すると、各々のＬＥＤは、光の照射方向の基軸（照射軸）が発光面から外部に導出する方向とほぼ同方向（即ち、発光面と直交方向）に配置されているために、ＬＥＤの発光部分が光の粒（輝点）として見えてしまうので、発光面に光の均一性がなく、点灯の見栄えが悪いという問題があった。   Conventionally, as an illuminating device using a light emitting diode (LED) as a light source, for example, a light emitting surface (planar light transmitting portion) of the illuminating device is used as a cover, and a plurality of LEDs are arranged horizontally with respect to the light emitting surface. The mainstream is a structure in which light is emitted from the light emitting surface by arranging the LEDs side by side in the direction and deriving the light (light emitting portion) of these LEDs from the light emitting surface that is the exit of the light. However, when the illumination device is observed from the outside when the LED is in the lighting state, each LED has a direction in which the base axis (irradiation axis) of the light irradiation direction is derived from the light emitting surface to the outside. Since they are arranged in almost the same direction (that is, in a direction orthogonal to the light emitting surface), the light emitting portion of the LED appears as light grains (bright spots). There was a problem that it looked bad.

通常、発光面からの照射光を均一に見せる対策としては、例えば乳白色の樹脂や磨りガラス等からなるレンズを使用したり、或いはレンズにレンズカットを形成したりするなど、光源からの光を拡散させるための細工が必要となる。しかし、ＬＥＤのような指向性のある光源においては、光の指向性が強いが故に、これらの対策を用いても発光面を均一に見せる（面発光させる）のは困難である。その上で、一定以上の光の均一輝度を保つためには、複数のＬＥＤを使用しなければならず、この場合は発光面積が増えれば増えるほど、その分だけより多くのＬＥＤが必要となるので、ＬＥＤに要する部品コストが多くかかる問題に繋がってしまう。   Usually, as a measure to make the irradiation light from the light emitting surface uniform, for example, a lens made of milky white resin or frosted glass is used, or a lens cut is formed on the lens to diffuse the light from the light source. Work is required to make it happen. However, in a light source having directivity such as an LED, since the directivity of light is strong, it is difficult to make the light emitting surface uniformly (surface light emission) even if these countermeasures are used. In addition, in order to maintain a uniform brightness of light above a certain level, a plurality of LEDs must be used. In this case, the more light emission area, the more LEDs are required. Therefore, it leads to the problem that the component cost required for LED increases.

この問題を解決するための有効な対策として、例えば図１１に示すように、ＬＥＤ８１（高輝度発光ダイオード）と導光板８２とを組み合わせたエッジライト方式を使用した照明装置８３（例えば、特許文献１参照）がある。この照明装置８３では、導光効果を持つようブラスト成形等で加工した透明度の高い樹脂板からなる導光板８２を用い、この導光板８２のエッジ部分（端縁部分）にＬＥＤ８１を配置し、このエッジ部分にＬＥＤ８１の光を入射する。そして、ＬＥＤ８１の光を導光板８２によって拡散させ、この光を発光部８４の発光面から均一に見える照射光として出力させる。   As an effective measure for solving this problem, for example, as shown in FIG. 11, an illumination device 83 (for example, Patent Document 1) using an edge light system in which an LED 81 (high luminance light emitting diode) and a light guide plate 82 are combined. See). In this illuminating device 83, a light guide plate 82 made of a highly transparent resin plate processed by blast molding or the like so as to have a light guide effect is used, and LEDs 81 are arranged on the edge portion (edge portion) of the light guide plate 82. The light of the LED 81 is incident on the edge portion. Then, the light of the LED 81 is diffused by the light guide plate 82, and this light is output as irradiation light that appears uniformly from the light emitting surface of the light emitting unit 84.

特開２００２−２２９０２２号公報Japanese Patent Laid-Open No. 2002-229022

ところで、この種の導光板８２は、樹脂に細かい加工や印刷等が必要となるので、部品コストが総じて高いという現状がある。よって、照明装置８３の照射光の均一化を図る際に、このような導光板８２を使用すると、ＬＥＤ８１の個数は少なく抑えられるものの、今度は導光板８２を用意するためのコストが逆にかかり、結局のところ照明装置８３の装置コストを低く抑えることには繋がらない現状があった。また、この種の導光板８２には、重量が大きいという欠点も存在するので、照射輝度均一化の部品として導光板８２を使用すると、照明装置８３の重量が重くなる問題にも繋がっていた。   By the way, since this kind of light guide plate 82 requires fine processing, printing, or the like on the resin, there is a current situation that the cost of parts is generally high. Therefore, when using such a light guide plate 82 to equalize the irradiation light of the lighting device 83, the number of LEDs 81 can be reduced, but this time the cost for preparing the light guide plate 82 is reversed. After all, there was a situation that does not lead to keeping the device cost of the lighting device 83 low. In addition, since this type of light guide plate 82 has a disadvantage that it is heavy, using the light guide plate 82 as a component for uniforming the luminance of illumination leads to a problem that the weight of the lighting device 83 becomes heavy.

本発明の目的は、指向性光源を発光面の端部に配置してこれを光源とする照明構造をとる場合であっても、導光板を使用せずに発光面を面発光させることができる照明装置を提供することにある。   An object of the present invention is to allow surface emission of a light emitting surface without using a light guide plate even when a directional light source is arranged at an end portion of the light emitting surface and an illumination structure using this as a light source is taken. The object is to provide a lighting device.

前記問題点を解決するために、請求項１に係る発明では、装置ケースの両面に光出口として一対の面状光透過部を持ち、当該装置ケースの内部において該面状光透過部の端部に、照射光が指向性を持つ指向性光源を配置し、当該指向性光源から前記面状光透過部のもう一方の端部に向かって照射される前記照射光を前記面状光透過部から導出する照明装置において、前記一対の面状光透過部の裏面に、透光性の一対の光調整部材を平行に配置し、前記指向性光源は、複数の光源体から構成され、前記面状光透過部の各端部において一方側に配置された前記指向性光源の各々の前記光源体と、それらと対向するもう一方側に配置された前記指向性光源の各々の前記光源体とは、その前記指向性光源の照射軸方向に対する直交方向において交互に配置されており、かつ、前記指向性光源が、前記一対の光調整部材の間の空間において、その照射軸が該一対の光調整部材と平行になるように配置され、前記一対の光調整部材の前記一対の面状光透過部側には、平行に延びる複数の溝が形成されるとともに前記一対の光調整部材の対向する側は平坦に形成され、前記一対の光調整部材が、自身の該溝の溝方向と前記指向性光源の照射軸方向とが同方向をとる向きで前記装置ケースに取り付けられ、当該一対の光調整部材は、前記指向性光源によって当該光調整部材に入射した照射光を、前記複数の溝により前記指向性光源の照射軸と直交する方向に拡散する拡散効果と、その入射側に折り返す反射効果とを有し、当該一対の光調整部材が持つ互いの反射効果によって、前記照射光を前記面状光透過部の他端まで導く導光効果、及び前記拡散効果の複合効果によって、前記一対の面状光透過部を面全体に亘って光らせる両面発光により照明を行うことを要旨とする。   In order to solve the above problems, in the invention according to claim 1, the device case has a pair of planar light transmission portions as light outlets on both surfaces of the device case, and the end portions of the planar light transmission portions inside the device case. In addition, a directional light source having directional light is disposed, and the irradiation light emitted from the directional light source toward the other end of the planar light transmitting portion is transmitted from the planar light transmitting portion. In the illuminating device to be derived, a pair of translucent light adjusting members are arranged in parallel on the back surfaces of the pair of planar light transmitting portions, and the directional light source includes a plurality of light source bodies, and the planar shape Each of the light source bodies of the directional light source disposed on one side at each end of the light transmitting portion, and each of the light source bodies of the directional light source disposed on the other side facing them, Alternately in the direction orthogonal to the irradiation axis direction of the directional light source And the directional light source is disposed in a space between the pair of light adjustment members so that an irradiation axis thereof is parallel to the pair of light adjustment members, and the pair of light adjustment members A plurality of grooves extending in parallel are formed on the side of the pair of planar light transmission parts, and the opposing sides of the pair of light adjustment members are formed flat, and the pair of light adjustment members The groove direction of the groove and the irradiation axis direction of the directional light source are attached to the apparatus case so that the direction of the directional light source is the same direction, and the pair of light adjustment members are incident on the light adjustment member by the directional light source. It has a diffusion effect that diffuses light in the direction perpendicular to the irradiation axis of the directional light source by the plurality of grooves, and a reflection effect that turns back to the incident side, and the mutual reflection effect that the pair of light adjustment members have By the irradiation light, the planar shape Guiding effect of guiding to the other end of the transmission portion, and the combined effect of the diffusion effect, the gist to carry out illumination by means of a double-sided emission illuminate the pair of planar light transmitting portion over the entire surface.

ここで、「光源の照射軸」とは、光源からの配光（光束）分布の中心軸を言い、この照射軸上では、光源から等距離の位置において、単位面積当たりの光束量がおよそ最大となるような性質を有する。なお、この中心軸は、例えば、電球や砲弾型のＬＥＤにおける構造的（幾何学的）な対称軸を必ずしも意味するものではない。   Here, the “irradiation axis of the light source” refers to the central axis of the light distribution (light flux) distribution from the light source. On this irradiation axis, the amount of light flux per unit area is approximately the maximum at a position equidistant from the light source. It has the property which becomes. The central axis does not necessarily mean a structural (geometric) symmetry axis in, for example, a light bulb or a bullet-type LED.

この構成によれば、面状光透過部（発光面）に指向性光源が映り込んで見栄えが悪くならないように、一対の面状光透過部の端部に照明光源が配置される。そして、この指向性光源が発光した際、この照射光の一部が光調整部材の拡散効果により指向性光源の照射軸に対して垂直に交わる直交方向に拡散されて、一対の面状光透過部から外部に放射される。また、反射効果をも有する一対の光調整部材を向き合わせて配置することにより生じる導光効果により、この２者間に通した照射光が、その照射方向（照射軸方向）に導かれるので、指向性光源の反射光の多くがケース反対側の端部にまで届くようになる。このため、指向性光源の光が面状光透過部（発光面）に広く行き渡るので、例えば高価な部品である導光板を使用せずとも、一対の面状光透過部を面発光させる両面発光が可能となる。   According to this configuration, the illumination light source is arranged at the ends of the pair of planar light transmission parts so that the directional light source is reflected on the planar light transmission part (light emitting surface) and the appearance does not deteriorate. When the directional light source emits light, a part of the irradiation light is diffused in an orthogonal direction perpendicular to the irradiation axis of the directional light source due to the diffusion effect of the light adjusting member, and a pair of planar light transmissions is performed. Radiated from the outside. In addition, due to the light guide effect caused by arranging a pair of light adjusting members having a reflection effect facing each other, the irradiation light passed between the two is guided in the irradiation direction (irradiation axis direction), Most of the reflected light from the directional light source reaches the end on the opposite side of the case. For this reason, since the light of the directional light source spreads widely to the planar light transmission part (light emitting surface), for example, double-sided light emission that causes a pair of planar light transmission parts to emit light without using an expensive light guide plate Is possible.

さらに、本発明では、発光部の両端部に面発光の光源を配置したので、発光部の両側をともに明るく照らし出すことが可能となる。このため、例えば光源の照射光の発光方向において片側のみが明るく、もう片側が暗くなってしまうような照明状態をとり難くすることが可能となる。   Furthermore, in the present invention, since the surface emitting light sources are arranged at both ends of the light emitting unit, both sides of the light emitting unit can be illuminated brightly. For this reason, for example, it is possible to make it difficult to take an illumination state in which only one side is bright and the other side is dark in the light emission direction of the light source.

加えて、本発明では、面状光透過部の両端部において一方側に配置された複数の光源体の間が、これらと対向する位置に配置された光源体の光によって照明される。このため、面状光透過部の両端部の一方側に配置された隣同士の光源体の間が、対向する光源によって光が補われるので、面発光の均一化を一層図ることが可能となる。   In addition, in the present invention, between the plurality of light source bodies arranged on one side at both ends of the planar light transmission part is illuminated by the light of the light source body arranged at a position facing these. For this reason, since light is supplemented by the opposing light sources between the adjacent light source bodies arranged on one side of both ends of the planar light transmitting portion, it is possible to further achieve uniform surface emission. .

その上、溝の界面における光の屈折及び反射作用により、光調整部材に入射された光が、この光の照射方向（照射軸方向）に対して垂直に交わる直交方向に拡散するという拡散効果によって、光源の照射光がこの直交方向に広がる。また、特に、溝が隣同士のものと等間隔をおいて平行に延びるように規則正しく配置された場合、光が規則正しく反射して他端まで導かれるという導光効果により、光源の照射光を光調整部材の溝方向に沿って遠くまで届かせられる。このため、指向性光源の光が照射方向及びその直交方向の両方向に広がるので、発光面をより一層均一に照明させることが可能となる。   In addition, due to the light refraction and reflection action at the groove interface, the light incident on the light adjusting member is diffused in an orthogonal direction perpendicular to the light irradiation direction (irradiation axis direction). The irradiation light of the light source spreads in this orthogonal direction. In particular, when the grooves are regularly arranged so as to extend in parallel with the adjacent ones at an equal interval, the light is reflected regularly and guided to the other end by the light guide effect. It can reach far along the groove direction of the adjusting member. For this reason, since the light of the directional light source spreads in both the irradiation direction and the orthogonal direction, the light emitting surface can be illuminated more uniformly.

請求項２に係る発明では、請求項１に記載の照明装置において、前記一対の光調整部材は、シート状をなしたシート材であることを要旨とする。
この構成によれば、光調整部材の厚さを薄くすることができるので、照明装置の厚さサイズを小さくすることが可能となる。 The invention according to claim 2 is summarized in that, in the illumination device according to claim 1, the pair of light adjusting members is a sheet material having a sheet shape.
According to this configuration, since the thickness of the light adjustment member can be reduced, the thickness size of the lighting device can be reduced.

請求項３に係る発明では、請求項１又は請求項２に記載の照明装置において、前記一対の光調整部材に形成された平行に延びる複数の溝は、互いに等間隔の距離をおいて形成されていることを要旨とする。   According to a third aspect of the present invention, in the illumination device according to the first or second aspect, the plurality of parallel grooves formed in the pair of light adjusting members are formed at equal distances from each other. It is a summary.

請求項４に係る発明では、請求項１〜３のいずれか一項に記載の照明装置において、前記一対の光調整部材に形成された溝は、奥に向かうに従い深さ幅が連続的に小さくなる断面三角形状の穴形状をとり、６０度〜１２０度の間の溝角度が付けられたことを要旨とする。   In the invention which concerns on Claim 4, in the illuminating device as described in any one of Claims 1-3, the depth width of the groove | channel formed in the said pair of light adjustment member becomes small continuously toward the back. The gist is that the hole has a triangular shape in cross section and a groove angle between 60 degrees and 120 degrees is provided.

請求項５に係る発明では、請求項１〜４のいずれか一項に記載の照明装置において、前記一対の光調整部材は、表面側がアクリル系樹脂により形成されるとともに、裏面側がポリエステルフィルム層からなる２重構造をとっていることを要旨とする。   In the invention which concerns on Claim 5, in the illuminating device as described in any one of Claims 1-4, as for a pair of said light adjustment member, while the surface side is formed with an acrylic resin, a back surface side is from a polyester film layer. The gist is that it has a double structure.

請求項６に係る発明では、請求項１〜５のいずれか一項に記載の照明装置において、前記指向性光源は、ＬＥＤから構成されることを要旨とする。
請求項７に係る発明では、請求項１〜６のいずれか一項に記載の照明装置において、前記指向性光源の照射光を前記一対の光調整部材によって前記一対の面状光透過部から面発光させる機能単位を複数備えることを要旨とする。 The invention according to claim 6 is summarized in that, in the illumination device according to any one of claims 1 to 5, the directional light source is configured by an LED.
In the invention which concerns on Claim 7, in the illuminating device as described in any one of Claims 1-6, the irradiation light of the said directional light source is surfaced from the said pair of planar light transmission part by the said pair of light adjustment member. The gist is to provide a plurality of functional units that emit light.

この構成によれば、発光面積を大きく取った照明装置にも照明の光源として応用可能となる。   According to this configuration, it can be applied as an illumination light source to a lighting device having a large light emitting area.

本発明によれば、指向性光源を発光部の端部に配置してこれを光源とする照明構造をとる場合であっても、導光板を使用せずに発光面から面発光させることができる。   According to the present invention, even when a directional light source is disposed at an end of a light emitting unit and an illumination structure using the directional light source as a light source is used, surface light can be emitted from the light emitting surface without using a light guide plate. .

一実施形態における照明装置が設置された車内の外観を示す斜視図。The perspective view which shows the external appearance in the vehicle in which the illuminating device in one Embodiment was installed. 照明装置の具体的構成を示す分解斜視図。The disassembled perspective view which shows the specific structure of an illuminating device. 照明装置の外観を示す斜視図。The perspective view which shows the external appearance of an illuminating device. 照明装置の内部構造を示す縦断面図。The longitudinal cross-sectional view which shows the internal structure of an illuminating device. 照明装置の光源であるＬＥＤの配置位置を示す模式図。The schematic diagram which shows the arrangement position of LED which is a light source of an illuminating device. 光拡散フィルムの外観を示す平面図及びその部分拡大図。The top view which shows the external appearance of a light-diffusion film, and its partial enlarged view. 光拡散フィルムの表面形状を示す拡大斜視図。The expansion perspective view which shows the surface shape of a light-diffusion film. 光拡散フィルムで光が拡散及び屈折する状態を示す説明図であり、（ａ）は入射角が臨界角よりも小さい場合、（ｂ）は入射角が臨界角よりも大きい場合、（ｃ）は入射が臨界角とほぼ同じ値をとる場合の説明図。It is explanatory drawing which shows the state which light diffuses and refracts in a light-diffusion film, (a) when an incident angle is smaller than a critical angle, (b) when an incident angle is larger than a critical angle, (c) is Explanatory drawing in case incidence takes the substantially same value as a critical angle. 別例における照明装置の一例を示す縦断面図。The longitudinal cross-sectional view which shows an example of the illuminating device in another example. 他の別例おける照明装置の一例を示す構成図。The block diagram which shows an example of the illuminating device in another example. 従来における照明装置の構成例を示す縦断面図。The longitudinal cross-sectional view which shows the structural example of the conventional illuminating device.

以下、本発明を具体化した照明装置の一実施形態を図１〜図８に従って説明する。
図１に示すように、車両１の車内天井には、車内を照明する器具として照明灯具２が設けられている。この照明灯具２には、照明灯具２の動作モードを切り換える際に操作するスライド式の操作スイッチ３が設けられている。操作スイッチ３は、ドア点灯位置、オン位置、オフ位置の３位置に操作可能であり、操作スイッチ３がドア点灯位置に操作されると、車両ドア４を開けた際に照明灯具２が点灯し、操作スイッチ３がオン位置に操作さると、照明灯具２が常時点灯状態をとり、操作スイッチ３がオフ位置に操作されると、照明灯具２が常時消灯状態をとる。なお、照明灯具２が照明装置に相当する。 Hereinafter, an embodiment of a lighting device embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, an illumination lamp 2 is provided on the interior ceiling of the vehicle 1 as an instrument for illuminating the interior of the vehicle. The illumination lamp 2 is provided with a slide type operation switch 3 that is operated when the operation mode of the illumination lamp 2 is switched. The operation switch 3 can be operated in three positions: a door lighting position, an on position, and an off position. When the operation switch 3 is operated to the door lighting position, the illumination lamp 2 is turned on when the vehicle door 4 is opened. When the operation switch 3 is operated to the on position, the illumination lamp 2 is always turned on, and when the operation switch 3 is operated to the off position, the illumination lamp 2 is always turned off. The illumination lamp 2 corresponds to an illumination device.

図２に示すように、照明灯具２には、照明灯具２の本体ケース５の基材部分として長四角平板形状をなしたベース部材６が設けられている。このベース部材６の上面６ａ側には、ベース部材６を上から閉じる上蓋としてカバー７が例えばネジ８により取り付け固定されている。カバー７におけるネジ８の取り付け先であるネジ取付部９は、カバー７の段差部１０に設けられ、この段差部１０にネジ用蓋１１を取り付けることにより、ネジ取付部９に螺着されたネジ８が外部に露出しないように意匠性が確保されている。なお、本体ケース５が装置ケースに相当する。また、カバー７の外面側が装置ケースの表面、ベース部材６の外面側が装置ケースの裏面に相当し、ベース部材６の上面６ａが装置ケースの底面の内面に相当する。   As shown in FIG. 2, the illumination lamp 2 is provided with a base member 6 having a rectangular plate shape as a base material portion of the main body case 5 of the illumination lamp 2. On the upper surface 6 a side of the base member 6, a cover 7 is attached and fixed as, for example, a screw 8 as an upper lid for closing the base member 6 from above. A screw mounting portion 9, which is a mounting destination of the screw 8 in the cover 7, is provided in a stepped portion 10 of the cover 7, and a screw that is screwed to the screw mounting portion 9 by mounting a screw lid 11 on the stepped portion 10. Designability is ensured so that 8 is not exposed to the outside. The main body case 5 corresponds to a device case. The outer surface side of the cover 7 corresponds to the surface of the device case, the outer surface side of the base member 6 corresponds to the back surface of the device case, and the upper surface 6a of the base member 6 corresponds to the inner surface of the bottom surface of the device case.

図２及び図３に示すように、カバー７には、その中央から反ネジ側端部までの一帯に亘り、本体ケース５の外壁であるカバー上壁を長四角形状に刳り抜くことにより開口部１２が形成されている。この開口部１２には、照明灯具２の光出口として平面形状（板形状）のレンズ１３が取り付けられている。本例の照明灯具２は、レンズ１３の表面全域から光を照射させる面発光によって周囲を照明する。レンズ１３は、ダイヤカット形状をとり、発光面の面全体が光るように面発光の均一化を補助する。レンズ１３は、自身の端縁に形成された複数の引掛部１４を、開口部１２の周縁に形成された対応する引掛穴１５に各々係止することにより、カバー７に組み付けられている。また、本例の照明灯具２は、カバー７側のみから光を照射する片面発光式となっている。なお、レンズ１３が面状光透過部に相当する。   As shown in FIGS. 2 and 3, the cover 7 has an opening by punching out the upper wall of the cover, which is the outer wall of the main body case 5, in a long rectangular shape from the center to the end on the side opposite to the screw. 12 is formed. A planar (plate-shaped) lens 13 is attached to the opening 12 as a light outlet of the illumination lamp 2. The illuminating lamp 2 of this example illuminates the surroundings by surface emission that irradiates light from the entire surface of the lens 13. The lens 13 has a diamond-cut shape, and assists in uniform surface emission so that the entire surface of the light emitting surface shines. The lens 13 is assembled to the cover 7 by locking a plurality of hooking portions 14 formed on the edge of the lens 13 to corresponding hooking holes 15 formed on the peripheral edge of the opening 12. Moreover, the illumination lamp 2 of this example is a single-sided light emitting type that emits light only from the cover 7 side. The lens 13 corresponds to a planar light transmission part.

図２、図４及び図５に示すように、ベース部材６において照明灯具２の幅方向（図２のＸ軸方向）の両端には、互いに向き合う位置状態で一対の光源ユニット１６が取り付けられている。これら光源ユニット１６は、照明灯具２の長手方向（図２のＹ軸方向）に沿って等間隔に配置された複数のＬＥＤ１７，１７…と、これらＬＥＤ１７，１７…が実装された長細い板形状のＬＥＤ基板１８とからなる。なお、照明灯具２の光源としてＬＥＤ１７を使用するのは、ＬＥＤ１７には長寿命であるという利点があるため、光源交換等の作業の手間を省けるからである。また、ＬＥＤ基板１８の端部（図２の手前側端部）には、ＬＥＤ１７を電機接続するための一対の基板端子１９，１９（片側のみ図示）が設けられている。なお、光源ユニット１６が指向性光源に相当し、ＬＥＤ１７が指向性光源における複数の光源体に相当する。   As shown in FIGS. 2, 4, and 5, a pair of light source units 16 are attached to both ends of the base member 6 in the width direction (X-axis direction in FIG. 2) of the illumination lamp 2 so as to face each other. Yes. These light source units 16 have a plurality of LEDs 17, 17... Arranged at regular intervals along the longitudinal direction of the illumination lamp 2 (Y-axis direction in FIG. 2), and a long and thin plate shape on which these LEDs 17, 17. LED substrate 18. The reason why the LED 17 is used as the light source of the illuminating lamp 2 is that the LED 17 has an advantage that it has a long life, and therefore, it is possible to save time and labor for replacing the light source. In addition, a pair of substrate terminals 19 and 19 (only one side is shown) for electrical connection of the LED 17 are provided at the end of the LED substrate 18 (front end in FIG. 2). The light source unit 16 corresponds to a directional light source, and the LEDs 17 correspond to a plurality of light source bodies in the directional light source.

これら光源ユニット１６，１６は、ベース部材６の幅方向両端部に折り曲げ形成された立設片２０，２０に、例えば接着テープ等によって各々縦向き（垂直方向）に取り付けられている。このため、ＬＥＤ１７は、レンズ１３の発光面に対して平行方向（以降、図５に示す発光方向Ｋｃと記す）に光を照射する。即ち、ＬＥＤ１７の照射軸は、レンズ１３の発光面に対して垂直な位置関係となる。なお、発光方向Ｋｃは、ＬＥＤ１７の照射軸をとることに加え、照明灯具２の長手方向に対して垂直方向をとることも含む。また、本例の照明灯具２の照明構造は、幅方向端部から照射されるＬＥＤ１７の光を、照明灯具２の高さ方向（図２のＺ軸方向）に導いてレンズ１３から照明光として引き出す方式である。また、ＬＥＤ１７に前述の配置位置をとらせるのは、ＬＥＤ１７自体がレンズ１３に映り込ませずに、点灯の見栄えをよくするためである。更に、図５に示すように、ＬＥＤ１７は、照明灯具２の幅方向（図２のＸ軸方向）において一方の側に位置するものと、同じ幅方向においてもう一方の側に位置するものが、発光方向Ｋｃに対して垂直に交わる直交方向Ｋｈおいて互い違いに配置されている。   These light source units 16 and 16 are attached to the standing pieces 20 and 20 formed by bending at both ends in the width direction of the base member 6 in a vertical direction (vertical direction), for example, with an adhesive tape or the like. For this reason, the LED 17 emits light in a direction parallel to the light emitting surface of the lens 13 (hereinafter referred to as the light emitting direction Kc shown in FIG. 5). That is, the irradiation axis of the LED 17 is in a positional relationship perpendicular to the light emitting surface of the lens 13. The light emission direction Kc includes taking the irradiation axis of the LED 17 and also taking the direction perpendicular to the longitudinal direction of the illumination lamp 2. Moreover, the illumination structure of the illumination lamp 2 of this example guides the light of LED17 irradiated from the width direction edge part to the height direction (Z-axis direction of FIG. 2) of the illumination lamp 2, and uses it as illumination light from the lens 13. It is a method of drawing out. Further, the reason why the LED 17 takes the above-described arrangement position is to improve the appearance of lighting without the LED 17 itself being reflected in the lens 13. Furthermore, as shown in FIG. 5, the LED 17 is located on one side in the width direction of the illumination lamp 2 (X-axis direction in FIG. 2), and the LED 17 is located on the other side in the same width direction. They are staggered in the orthogonal direction Kh perpendicular to the light emission direction Kc.

また、ベース部材６の上面（照明灯具２のケースで見ると内面）には、表面に光反射作用を持つ薄板形状の反射板２１が例えば接着テープ等により取り付け固定されている。この反射板２１は、対向する一対の光源ユニット１６の間に、照明灯具２の高さ方向においてレンズ１３と所定距離を開けて配置されている。反射板２１は、ＬＥＤ１７からの照射光をレンズ１３側に反射させるために働くもので、例えばＰＥＴ（Polyethylene terephthalate）により形成されている。なお、反射板２１が反射部材に相当する。   Further, on the upper surface of the base member 6 (inner surface when viewed in the case of the illumination lamp 2), a thin plate-like reflecting plate 21 having a light reflecting action on the surface is attached and fixed by, for example, an adhesive tape. The reflection plate 21 is disposed between the pair of light source units 16 facing each other with a predetermined distance from the lens 13 in the height direction of the illumination lamp 2. The reflecting plate 21 functions to reflect the irradiation light from the LED 17 toward the lens 13 and is made of, for example, PET (Polyethylene terephthalate). The reflecting plate 21 corresponds to a reflecting member.

図２、図４、図６及び図７に示すように、レンズ１３の裏面には、入力光を集光して照射する働きを持つ光拡散フィルム２２が取り付けられている。光拡散フィルム２２は、例えばプリズムシートとも呼ばれるもので、薄い樹脂シート（樹脂フィルム）により形成されている。更に詳しく言うと、表面側（レンズ１３側）がアクリル系樹脂により形成されるとともに、裏面側（反射板２１側）がポリエステルフィルム層からなる２重構造をとっている。本例の光拡散フィルム２２は、反射板２１に対して所定間隔（隙間）を空けた状態で、図２に示すように、自身の周縁に形成された複数の係止舌片２３を、引掛穴１５，１５を連続して繋ぐ開口周縁の切込部２４に挿し込むことによりカバー７に取り付けられている。なお、光拡散フィルム２２が光調整部材に相当する。   As shown in FIGS. 2, 4, 6, and 7, a light diffusion film 22 having a function of collecting and irradiating input light is attached to the back surface of the lens 13. The light diffusion film 22 is also called, for example, a prism sheet, and is formed of a thin resin sheet (resin film). More specifically, the front side (lens 13 side) is formed of an acrylic resin, and the back side (reflector 21 side) has a double structure composed of a polyester film layer. The light diffusing film 22 of the present example hooks a plurality of locking tongues 23 formed on its peripheral edge as shown in FIG. 2 with a predetermined interval (gap) between the reflecting plate 21 and the light diffusing film 22. The hole 15 is attached to the cover 7 by being inserted into a notch 24 at the periphery of the opening that continuously connects the holes 15. The light diffusion film 22 corresponds to a light adjusting member.

図６〜図８に示すように、光拡散フィルム２２の表面には、フィルム幅方向（図７のＸ軸方向）に沿って一帯に亘って延びる線の細い溝２５，２５…が、フィルム長さ方向（図７のＹ軸方向）に沿って等間隔に並ぶ配置状態をとって複数形成されている。これら溝２５，…は、奥に向かうに従い深さ幅が連続的に小さくなる断面三角形状の穴形状をとり、所定の溝角度θ（例えば、６０度〜１２０度の間の角度）が付けられている。また、隣同士の溝間には、これら溝２５，２５を切ることによってできる断面三角形状の山部２６が複数形成されている。即ち、光拡散フィルム２２の表面には、断面三角形状の溝２５と山部２６が、フィルム長さ方向に沿って交互に形成された形状をとっている。   As shown in FIGS. 6 to 8, thin grooves 25, 25... Extending along the film width direction (X-axis direction in FIG. 7) along the film width direction are formed on the surface of the light diffusion film 22. A plurality of elements are formed in an arrangement state arranged at equal intervals along the vertical direction (Y-axis direction in FIG. 7). These grooves 25,... Have a triangular cross-sectional shape whose depth width decreases continuously toward the back, and have a predetermined groove angle θ (for example, an angle between 60 degrees and 120 degrees). ing. Further, a plurality of ridges 26 having a triangular cross section formed by cutting the grooves 25 are formed between adjacent grooves. That is, the surface of the light diffusion film 22 has a shape in which grooves 25 and peaks 26 having a triangular cross section are alternately formed along the film length direction.

また、図６に示すように、光拡散フィルム２２は、自身に切られた溝２５の延びる方向（同図の溝方向Ｍｃ）がＬＥＤ１７の発光方向Ｋｃと平行方向をとる配置向きをとってカバー７に取り付けられている。更に、図４に示すように、反射板２１と光拡散フィルム２２との間には、所定間隔を空けて配置することにより空間領域が形成され、この空間領域がＬＥＤ１７の照射光が通る光通過領域２７となっている。   Further, as shown in FIG. 6, the light diffusion film 22 covers a direction in which the extending direction of the groove 25 cut in itself (the groove direction Mc in the figure) is parallel to the light emission direction Kc of the LED 17. 7 is attached. Further, as shown in FIG. 4, a spatial region is formed between the reflecting plate 21 and the light diffusion film 22 by arranging them at a predetermined interval, and this spatial region passes light through which the irradiation light of the LED 17 passes. Region 27 is formed.

また、図２に示すように、ベース部材６の内面には、照明灯具２の各種電装部品が実装された基板２８がテープ部材２９を介して取り付け固定されている。この基板２８には、操作スイッチ３がどの位置に操作されたのかを検出するスイッチ回路３０が実装されている。操作スイッチ３のスイッチ操作に応じてスイッチ回路３０の接点が切り換わると、照明灯具２の動作モードがドア点灯状態、オン状態、オフ状態の３状態のうちのいずれかのモードに入る。   Further, as shown in FIG. 2, a substrate 28 on which various electrical components of the illumination lamp 2 are mounted is fixedly attached to the inner surface of the base member 6 via a tape member 29. A switch circuit 30 is mounted on the substrate 28 to detect where the operation switch 3 has been operated. When the contact of the switch circuit 30 is switched according to the switch operation of the operation switch 3, the operation mode of the illumination lamp 2 enters any one of the three states of the door lighting state, the on state, and the off state.

また、基板２８には、一対の光源ユニット１６，１６と基板２８とを接続する内部配線（図示略）の基板２８における接続箇所として内部配線接続回路３１が実装されている。また、基板２８には、照明灯具２の内部から外部に引き出される外部配線（図示略）の基板２８における接続箇所として外部配線接続回路３２が実装されている。更に、ベース部材６の底壁には、外部配線の引き出し孔として配線通し孔３３が貫設されている。この配線通し孔３３には、外部配線を取り付け固定するブッシング３４が取り付け可能となっている。   In addition, an internal wiring connection circuit 31 is mounted on the substrate 28 as a connection location on the substrate 28 for internal wiring (not shown) that connects the pair of light source units 16, 16 and the substrate 28. In addition, an external wiring connection circuit 32 is mounted on the substrate 28 as a connection location on the substrate 28 for external wiring (not shown) drawn from the inside of the illumination lamp 2 to the outside. Furthermore, a wiring through hole 33 is provided in the bottom wall of the base member 6 as a lead hole for external wiring. A bushing 34 for attaching and fixing an external wiring can be attached to the wiring through hole 33.

さて、この種の光拡散フィルム２２において自身の裏面（下面２２ａ：図７参照）から入り込む入射光は、そのときの入射角によって、フィルム２２の境界面（図８では境界面３５）における光の拡散成分（屈折光）や反射成分（反射光）が変わるという性質がある。ここで、屈折率が大きい媒質から小さい媒質に光が入るときに、入射光が境界面を透過せず、すべて反射する現象を全反射といい、入射角（境界面の垂線に対してなす角度）がある一定の角度以上の場合、全反射がおこる。この角度は、臨界角θｘとして知られている。光拡散フィルム２２から外面（空気中）側に光が進む場合は、屈折率が大きい媒質（光拡散フィルム２２）から小さい媒質（空気）に光が入る場合に相当するため、上述の全反射がおこる場合がある。   Now, in this kind of light diffusion film 22, the incident light entering from its back surface (lower surface 22a: see FIG. 7) depends on the incident angle at that time, and the light on the boundary surface of the film 22 (boundary surface 35 in FIG. 8). There is a property that the diffusion component (refracted light) and the reflection component (reflected light) change. Here, when light enters from a medium with a high refractive index into a small medium, the incident light does not transmit through the boundary surface and is totally reflected is called total reflection. The incident angle (the angle formed with respect to the perpendicular to the boundary surface). ) If the angle exceeds a certain angle, total reflection occurs. This angle is known as the critical angle θx. When light travels from the light diffusion film 22 to the outer surface (in the air) side, it corresponds to the case where light enters from a medium having a large refractive index (light diffusion film 22) to a small medium (air). It may happen.

図８（ａ）に示すように、境界面３５に照射される入射光は、この境界面３５の垂線Ｌａに対してなす角度を入射角とすると、臨界角θｘよりも小さな入射角α（θｘ＞α）をとる場合、この一部が溝２５の境界面３５から屈折して上側に屈折角α１の角度をもって抜け出る（光の拡散効果）とともに、入射光の一部が境界面３５において同じ入射角αで反射しつつ、この反射光がその照射先である向かい側の境界面３６で反射する。   As shown in FIG. 8A, the incident light applied to the boundary surface 35 has an incident angle α (θx smaller than the critical angle θx) when the angle formed with respect to the perpendicular La of the boundary surface 35 is an incident angle. > Α), a part of the incident light is refracted from the boundary surface 35 of the groove 25 and escapes upward with a refraction angle α1 (light diffusion effect), and a part of the incident light is incident on the boundary surface 35 at the same incidence. While being reflected at the angle α, the reflected light is reflected by the opposite boundary surface 36 that is the irradiation destination.

また、図８（ｂ）に示すように、境界面３５に対する入射光は、臨界角θｘよりも大きな入射角β（θｘ＜β）をとる場合、全てが溝２５の境界面３５で同じ入射角βで以て反射しつつ、この反射光がその照射先である向かい側の境界面３６に照射される。そして、この反射光が例えば臨界角θｘよりも小さい入射角β１で境界面３６に到達したとすると、この反射光は、この一部が溝２５の境界面３６から屈折して上側に屈折角β２の角度をもって抜け出るとともに、反射光の一部が境界面３６で同じβ１の角度で更に反射して、フィルム２２の内側に向かって反射される（光の反射効果）。   Further, as shown in FIG. 8B, when the incident light with respect to the boundary surface 35 has an incident angle β (θx <β) larger than the critical angle θx, all the incident angles are the same at the boundary surface 35 of the groove 25. While being reflected by β, this reflected light is applied to the opposite boundary surface 36 that is the irradiation destination. If this reflected light reaches the boundary surface 36 at an incident angle β1 smaller than the critical angle θx, for example, a part of this reflected light is refracted from the boundary surface 36 of the groove 25 and the refraction angle β2 is on the upper side. And part of the reflected light is further reflected at the boundary surface 36 at the same β1 angle and reflected toward the inside of the film 22 (light reflection effect).

よって、光拡散フィルム２２の裏面２２ａから入射された入射光においてその一部は、この光の拡散効果によってフィルム表面から抜け出る光によって、光拡散フィルム２２の表側ではフィルム長さ方向に広がって見える。このため、本例では、図６に示すように、光拡散フィルム２２をカバー７に取り付けるに際して、ＬＥＤ１７の光の発光方向Ｋｃと光拡散フィルム２２の溝方向Ｍｃとを平行方向とすることで、ＬＥＤ１７の１本の照射光を光拡散フィルム２２により２本の照明光（図７参照）として映し出させている。これにより、光拡散フィルム２２の表面側において人の目に見える光の本数が多くなるので、レンズ１３の発光面をその長手方向（図３や図７のＹ軸方向）に広がらせることが可能となる。   Therefore, a part of the incident light incident from the back surface 22a of the light diffusing film 22 appears to spread in the film length direction on the front side of the light diffusing film 22 due to light exiting from the film surface due to the diffusion effect of this light. For this reason, in this example, as shown in FIG. 6, when attaching the light diffusion film 22 to the cover 7, the light emission direction Kc of the LED 17 and the groove direction Mc of the light diffusion film 22 are parallel to each other. One irradiation light of the LED 17 is projected as two illumination lights (see FIG. 7) by the light diffusion film 22. As a result, the number of light visible to the human eye increases on the surface side of the light diffusing film 22, so that the light emitting surface of the lens 13 can be extended in the longitudinal direction (Y-axis direction in FIGS. 3 and 7). It becomes.

一方、図８（ｃ）に示すように、境界面３５に対する入射光は、臨界角θｘと同じ、あるいは僅かに大きい入射角γ（θｘ≦γ＜β）をとる場合、溝２５の境界面３５において同じ入射角γで全反射するとともに更に境界面３６でも全反射して、入射光の全成分がフィルム２２の裏面側に抜け出る特性（光の反射効果）がある。よって、本例の光拡散フィルム２２では、光の入射角が臨界角θｘよりも僅かに大きい場合には、透過光がなく、すべてが全反射することから、反射効率が非常に高いものであるといえる。   On the other hand, as shown in FIG. 8C, when the incident light with respect to the boundary surface 35 has an incident angle γ (θx ≦ γ <β) that is the same as or slightly larger than the critical angle θx, the boundary surface 35 of the groove 25. In FIG. 2, the light is totally reflected at the same incident angle γ and further totally reflected at the boundary surface 36, so that all components of incident light escape to the back side of the film 22 (light reflection effect). Therefore, in the light diffusing film 22 of this example, when the incident angle of light is slightly larger than the critical angle θx, there is no transmitted light and all the light is totally reflected, so that the reflection efficiency is very high. It can be said.

本例では、光拡散フィルム２２の溝２５，２５…をフィルム幅方向に沿って真っ直ぐに規則正しく切り、図４に示すように、反射板２１と光拡散フィルム２２とを互いに向き合うように平行（水平）に配置させて、光拡散フィルム２２で高反射率を以て反射される光を、これら両者の間で反射を繰り返させることで光通過領域２７を作っている。このため、本例は、ＬＥＤ１７，１７…の照射光を、この光通過領域２７に光を通して反射させることによって、ＬＥＤ１７の照射光を遠くまで導く特性（光の導光効果）が得られる。よって、ＬＥＤ１７の光を照明灯具２の幅方向（図３や図７のＸ軸方向）においても広がらせることが可能となり、ＬＥＤ１７の反対側も明るく光らせることが可能となる。   In this example, the grooves 25, 25... Of the light diffusing film 22 are regularly cut straight along the film width direction, and as shown in FIG. 4, the reflector 21 and the light diffusing film 22 are parallel (horizontal) so as to face each other. The light passage region 27 is made by repeating the reflection between the light reflected by the light diffusion film 22 with a high reflectance. For this reason, in this example, the light (light guiding effect) for guiding the irradiation light of the LED 17 far is obtained by reflecting the irradiation light of the LEDs 17, 17... Therefore, the light from the LED 17 can be spread in the width direction of the illumination lamp 2 (X-axis direction in FIGS. 3 and 7), and the opposite side of the LED 17 can be brightly lit.

従って、本例においては、複数の細かい溝２５，２５…が規則正しく並ぶ光拡散フィルム２２を使用し、この光拡散フィルム２２が持つ光の拡散効果と導光効果とを利用して、ＬＥＤ１７の光を照明灯具２の長手方向及び幅方向に広がらせて、レンズ１３を面発光させる。このため、エッジライト方式に沿う配置状態をとるＬＥＤ１７の光を、高価な導光板を使用せずに面発光させることが可能となる。また、更に本例では、ＬＥＤ１７を照明灯具２を左右で互い違いに配置するので、同じ配置側のＬＥＤ１７，１７の間の隙間を、反対側のＬＥＤ１７の光で埋めることが可能となる。よって、レンズ１３上での光の発光バランスがよくなり、均一度の高い状態でレンズ１３を面発光させることが可能となる。   Therefore, in this example, the light diffusing film 22 in which a plurality of fine grooves 25, 25... Are regularly arranged is used, and the light diffusion effect and the light guiding effect of the light diffusing film 22 are utilized to make the light of the LED 17 light. Is spread in the longitudinal direction and the width direction of the illumination lamp 2 to cause the lens 13 to emit light. For this reason, it becomes possible to light-emit the light of LED17 which takes the arrangement state along an edge light system, without using an expensive light-guide plate. Further, in this example, since the LEDs 17 are alternately arranged on the left and right, the gap between the LEDs 17 and 17 on the same arrangement side can be filled with the light of the LED 17 on the opposite side. Therefore, the light emission balance on the lens 13 is improved, and it is possible to cause the lens 13 to emit light with high uniformity.

本実施形態の構成によれば、以下に記載の効果を得ることができる。
（１）ＬＥＤ１７が縦向きで本体ケース５の端部に配置された方式の照明構造をとる照明灯具２において、レンズ１３の裏面に光拡散フィルム２２を取り付け、この光拡散フィルム２２が持つ溝２５の直交方向における光の拡散効果と、光拡散フィルム２２及び反射板２１の間の領域２７を通る光をこれらにより反射し合わせて遠くに導く導光効果とにより、ＬＥＤ１７の光をレンズ１３の平面方向（Ｘ方向およびＹ方向）に広げる。このため、指向性を持つＬＥＤ１７の光を面状に広げることが可能となるので、この光源を使用してレンズ１３を面発光させることができる。 According to the configuration of the present embodiment, the following effects can be obtained.
(1) In the illuminating lamp 2 having the illumination structure of the type in which the LEDs 17 are arranged vertically and arranged at the end of the main body case 5, the light diffusion film 22 is attached to the back surface of the lens 13, and the groove 25 that the light diffusion film 22 has. The light of the LED 17 is guided to the plane of the lens 13 by the light diffusing effect in the orthogonal direction of the light and the light guiding effect that reflects the light passing through the region 27 between the light diffusing film 22 and the reflecting plate 21 and guides them away. Spread in the direction (X direction and Y direction). For this reason, since it becomes possible to spread the light of the LED 17 having directivity in a planar shape, the lens 13 can be surface-emitted using this light source.

（２）照明灯具２の光源であるＬＥＤ１７を、本体ケース５の幅方向両側に配置したので、照明灯具２の幅方向両側を、ともに明るく照らし出すことができる。このため、例えば照明灯具２の幅方向において片側のみが明るく、もう片側が暗くなってしまうような照明状態をとり難くすることができる。   (2) Since the LEDs 17 that are the light sources of the illumination lamp 2 are arranged on both sides in the width direction of the main body case 5, both sides in the width direction of the illumination lamp 2 can be illuminated brightly. For this reason, for example, in the width direction of the illumination lamp 2, it is possible to make it difficult to take an illumination state in which only one side is bright and the other side is dark.

（３）照明灯具２の幅方向において一方の側に位置するＬＥＤ１７と、もう一方の側に位置するＬＥＤ１７とが、ＬＥＤ１７の発光方向Ｋｃに対して垂直に交わる直交方向Ｋｈにおいて互い違いに配置される。このため、照明灯具２の幅方向において同じ側に位置するＬＥＤ１７の隣同士の間の隙間が、対向するＬＥＤ１７の光によって照明される。このため、この隙間の照明が補われるので、レンズ１３の面発光の均一化に効果が高くなる。   (3) The LEDs 17 located on one side in the width direction of the illumination lamp 2 and the LEDs 17 located on the other side are alternately arranged in an orthogonal direction Kh perpendicular to the light emission direction Kc of the LED 17. . For this reason, the clearance gap between the LED17 located in the same side in the width direction of the illumination lamp 2 is illuminated by the light of LED17 which opposes. For this reason, since the illumination of this gap is supplemented, the effect of making the surface emission of the lens 13 uniform is enhanced.

（４）ＬＥＤ１７の照射光をレンズ１３で面発光させるための部品として、樹脂フィルムの表面上に溝２５，２５が切られた光拡散フィルム２２が使用される。このため、フィルムの表面形状に特徴を持たせるだけで済むこの種の部品により、導光部材を使用しなくてもレンズ１３の面発光が可能となるので、実施に際して大幅なコストアップを招くことがない。   (4) A light diffusion film 22 in which grooves 25 and 25 are cut on the surface of the resin film is used as a component for causing the lens 13 to emit surface light from the LED 17. For this reason, this type of component that only needs to have a characteristic on the surface shape of the film enables surface emission of the lens 13 without using a light guide member. There is no.

（５）ＬＥＤ１７の照射光をレンズ１３で面発光させるための部品として、厚さの薄いシート形状の光拡散フィルム２２を使用したので、照明灯具２の厚さサイズを小さく済ますことができる。   (5) Since the sheet-shaped light diffusion film 22 having a thin thickness is used as a component for causing the lens 13 to emit light emitted from the LED 17, the thickness of the illumination lamp 2 can be reduced.

（６）照明灯具２の灯具種類を、本体ケース５の片面（上面）のみから光が照明される片側照明式とした。このため、照明灯具２の片側にのみ光透過機能を持たせば済むので、照明灯具２の構造を簡素なものとすることができる。   (6) The lamp type of the illumination lamp 2 is a one-side illumination type in which light is illuminated only from one side (upper surface) of the main body case 5. For this reason, since it is sufficient to provide a light transmission function only on one side of the illumination lamp 2, the structure of the illumination lamp 2 can be simplified.

なお、実施形態はこれまでに述べた構成に限らず、以下の態様に変更してもよい。
・ 光調整部材としてシート材からなる光拡散フィルム２２を使用した場合、これは必ずしもプリズムシートに限定されず、例えば光拡散シートや集光シートを採用してもよい。また、光調整部材は、必ずしもこの種の樹脂シート材に限るものではなく、例えば樹脂板やガラスを使用してもよい。 Note that the embodiment is not limited to the configuration described so far, and may be modified as follows.
When the light diffusing film 22 made of a sheet material is used as the light adjusting member, this is not necessarily limited to the prism sheet, and for example, a light diffusing sheet or a light collecting sheet may be adopted. The light adjusting member is not necessarily limited to this type of resin sheet material, and for example, a resin plate or glass may be used.

・ 光調整部材は、必ずしも複数の規則正しく並んだ溝２５，２５を表面に持つものに限らず、光の拡散機能及び反射機能を持つものであれば、形状や材質は特に限定されない。   The light adjusting member is not necessarily limited to one having a plurality of regularly arranged grooves 25 and 25 on the surface, and the shape and material are not particularly limited as long as the light adjusting member has a light diffusion function and a reflection function.

・ 光拡散フィルム２２は、表側がアクリル系樹脂で、裏面側がポリエステルフィルム層からなる２重構造をとるものに限定されず、１層の材質からなるものでもよい。また、２重構造をとる場合、これらの材質はアクリル及びポリエステルフィルムに限定されず、これら以外の材質を使用してもよい。   The light diffusion film 22 is not limited to one having a double structure in which the front side is an acrylic resin and the back side is a polyester film layer, and may be a single layer material. Moreover, when taking a double structure, these materials are not limited to an acryl and a polyester film, You may use materials other than these.

・ 照明灯具２は、必ずしも片面発光式に限定されない。例えば、図９に示すように、例えば反射板２１を光調整部材（即ち、光拡散フィルム２２）に置き換え、ベース部材６の一部をレンズのような透光性を有する部材とすることにより、本体ケース５の上面及び下面の両方から光が引き出される両面発光式としてもよい。   -The illumination lamp 2 is not necessarily limited to a single-sided light emission type. For example, as shown in FIG. 9, for example, by replacing the reflecting plate 21 with a light adjustment member (that is, the light diffusion film 22) and making a part of the base member 6 a light-transmissive member such as a lens, It is good also as a double-sided light emission type from which light is drawn out from both the upper surface and lower surface of the main body case 5.

・ 照明灯具２は、例えば図１０に示すように、ＬＥＤ１７の照射光を光拡散フィルム２２と反射板２１とで面発光させる機能単位を複数設けてもよい。この場合、照明灯具２が大型化する場合であっても、これに対応することができる。なお、この例においては、組をなすＬＥＤ１７群の間で、図１０のように光拡散フィルム２２及び反射板２１が個別に設けられるものに限らず、複数のＬＥＤ１７の組で１つの光拡散フィルム２２及び反射板２１が共用されるものでもよい。また、図１０では、片面発光式を示しているが、両面発光式としてもよいし、両者の組み合わせでもよい。   The illuminating lamp 2 may be provided with a plurality of functional units that cause the light emitted from the LEDs 17 to emit light with a light diffusion film 22 and a reflector 21 as shown in FIG. 10, for example. In this case, even if the illumination lamp 2 is enlarged, this can be dealt with. In this example, the light diffusing film 22 and the reflecting plate 21 are not individually provided as shown in FIG. 10 between the LED 17 groups forming a group, but one light diffusing film is formed by a set of a plurality of LEDs 17. 22 and the reflector 21 may be shared. Further, although FIG. 10 shows a single-sided light emission type, it may be a double-sided light emission type or a combination of both.

・ ＬＥＤ１７は、本体ケース５の幅方向両側に配置されることに限らず、一方のみに配置されるものでもよい。
・ ＬＥＤ１７は、本体ケース５の幅方向において左右で互い違いに配置されることに限らず、同じ位置に並ぶものでもよい。 The LEDs 17 are not limited to being disposed on both sides of the main body case 5 in the width direction, and may be disposed only on one side.
The LEDs 17 are not limited to being alternately arranged on the left and right in the width direction of the main body case 5, and may be arranged in the same position.

・ 指向性光源は、必ずしもＬＥＤ１７を複数もつものに限らず、１つで高い輝度が得られる場合は、１つのＬＥＤ１７から構成されるものでもよい。
・ 指向性光源は、必ずしも複数配置されたＬＥＤ１７に限定されず、光源から出される光に指向性があるものであれば、どのような種のものを使用してもよい。例えば、ひとつのＬＥＤであっても良いし、あるいは、ライン型の光源としては、アーパーチャー型冷陰極管などであってよい。 The directional light source is not necessarily limited to the one having a plurality of LEDs 17, and may be composed of a single LED 17 when high luminance can be obtained with one.
The directional light source is not necessarily limited to the plurality of LEDs 17 arranged, and any kind of directional light source may be used as long as the light emitted from the light source has directivity. For example, one LED may be used, or the line type light source may be an aperture type cold cathode tube.

・ レンズ１３は、必ずしも表面が平面になっているものに限らず、表面が若干の丸みを帯びた曲面形状をとっていてもよい。
・ 反射部材は、必ずしも板形状の反射板２１に限定されず、光を反射できるものであれば、その形状は特に限定されない。また、反射部材の材質も、樹脂であることに限定されるものではなく、光反射作用を持つもつものであれば、どのようなものを採用してもよい。 The lens 13 is not necessarily limited to one having a flat surface, and may have a curved surface with a slightly rounded surface.
The reflecting member is not necessarily limited to the plate-shaped reflecting plate 21 and the shape thereof is not particularly limited as long as it can reflect light. Further, the material of the reflecting member is not limited to resin, and any material may be adopted as long as it has a light reflecting action.

・ 照明灯具２は、必ずしも車両１の室内灯に使用されることに限らず、種々の灯具に応用可能であることは言うまでもない。   The illumination lamp 2 is not necessarily used for the interior lamp of the vehicle 1 but can be applied to various lamps.

２…照明装置としての照明灯具、５…装置ケースとしての本体ケース、１３…面状光透過部としてのレンズ、１６…指向性光源としての光源ユニット、１７…指向性光源における複数の光源体としてのＬＥＤ、２１…反射部材としての反射板、２２…光調整部材としての光拡散フィルム、２６…溝、Ｋｃ…発光方向、Ｋｈ…直交方向、Ｍｃ…溝方向。   DESCRIPTION OF SYMBOLS 2 ... Illuminating lamp as an illuminating device, 5 ... Main body case as an apparatus case, 13 ... Lens as a planar light transmission part, 16 ... Light source unit as a directional light source, 17 ... As several light source bodies in a directional light source 21 ... Reflector plate as reflecting member, 22 ... Light diffusion film as light adjusting member, 26 ... Groove, Kc ... Light emitting direction, Kh ... Orthogonal direction, Mc ... Groove direction.

Claims (7)

装置ケースの両面に光出口として一対の面状光透過部を持ち、
当該装置ケースの内部において該面状光透過部の端部に、照射光が指向性を持つ指向性光源を配置し、
当該指向性光源から前記面状光透過部のもう一方の端部に向かって照射される前記照射光を前記面状光透過部から導出する照明装置において、
前記一対の面状光透過部の裏面に、透光性の一対の光調整部材を平行に配置し、
前記指向性光源は、複数の光源体から構成され、
前記面状光透過部の各端部において一方側に配置された前記指向性光源の各々の前記光源体と、それらと対向するもう一方側に配置された前記指向性光源の各々の前記光源体とは、その前記指向性光源の照射軸方向に対する直交方向において交互に配置されており、
かつ、前記指向性光源が、前記一対の光調整部材の間の空間において、その照射軸が該一対の光調整部材と平行になるように配置され、
前記一対の光調整部材の前記一対の面状光透過部側には、平行に延びる複数の溝が形成されるとともに前記一対の光調整部材の対向する側は平坦に形成され、前記一対の光調整部材が、自身の該溝の溝方向と前記指向性光源の照射軸方向とが同方向をとる向きで前記装置ケースに取り付けられ
当該一対の光調整部材は、前記指向性光源によって当該光調整部材に入射した照射光を、前記複数の溝により前記指向性光源の照射軸と直交する方向に拡散する拡散効果と、その入射側に折り返す反射効果とを有し、
当該一対の光調整部材が持つ互いの反射効果によって、前記照射光を前記面状光透過部の他端まで導く導光効果、
及び前記拡散効果の複合効果によって、前記一対の面状光透過部を面全体に亘って光らせる両面発光により照明を行うことを特徴とする照明装置。 Has a pair of planar light transmission parts as light outlets on both sides of the device case,
A directional light source in which the irradiation light has directivity is arranged at the end of the planar light transmitting portion inside the device case,
In the illuminating device for deriving the irradiation light irradiated from the directional light source toward the other end of the planar light transmitting portion from the planar light transmitting portion,
A pair of translucent light adjustment members are arranged in parallel on the back surfaces of the pair of planar light transmission parts,
The directional light source is composed of a plurality of light source bodies,
Each light source body of the directional light source disposed on one side at each end of the planar light transmitting portion, and each light source body of the directional light source disposed on the other side opposite to the light source body. And are alternately arranged in a direction orthogonal to the irradiation axis direction of the directional light source,
And in the space between the pair of light adjustment members, the directional light source is arranged so that its irradiation axis is parallel to the pair of light adjustment members,
A plurality of grooves extending in parallel are formed on the pair of planar light transmitting portions side of the pair of light adjusting members, and opposite sides of the pair of light adjusting members are formed flat, and the pair of light An adjusting member is attached to the device case in a direction in which the groove direction of the groove and the irradiation axis direction of the directional light source are in the same direction, and the pair of light adjusting members are adjusted by the directional light source. A diffusion effect of diffusing the incident light incident on the member in a direction perpendicular to the irradiation axis of the directional light source by the plurality of grooves, and a reflection effect of folding back to the incident side;
A light guide effect that guides the irradiation light to the other end of the planar light transmission part by the mutual reflection effect of the pair of light adjusting members,
And the illumination apparatus characterized by performing illumination by the double-sided light emission which makes the said pair of planar light transmission part shine over the whole surface by the compound effect of the said diffusion effect. 前記一対の光調整部材は、シート状をなしたシート材であることを特徴とする請求項１に記載の照明装置。   The lighting device according to claim 1, wherein the pair of light adjusting members is a sheet-like sheet material. 前記一対の光調整部材に形成された平行に延びる複数の溝は、互いに等間隔の距離をおいて形成されていることを特徴とする請求項１又は請求項２に記載の照明装置。   The lighting device according to claim 1 or 2, wherein the plurality of grooves extending in parallel formed in the pair of light adjusting members are formed at equal distances from each other. 前記一対の光調整部材に形成された溝は、奥に向かうに従い深さ幅が連続的に小さくなる断面三角形状の穴形状をとり、６０度〜１２０度の間の溝角度が付けられたことを特徴とする請求項１〜３のいずれか一項に記載の照明装置。   The grooves formed in the pair of light adjusting members have a hole shape with a triangular cross section whose depth width decreases continuously toward the back, and a groove angle between 60 degrees and 120 degrees is given. The illumination device according to any one of claims 1 to 3. 前記一対の光調整部材は、表面側がアクリル系樹脂により形成されるとともに、裏面側がポリエステルフィルム層からなる２重構造をとっていることを特徴とする請求項１〜４のいずれか一項に記載の照明装置。   5. The pair of light adjusting members has a double structure in which a front surface side is formed of an acrylic resin and a back surface side is formed of a polyester film layer. 6. Lighting equipment. 前記指向性光源は、ＬＥＤから構成されることを特徴とする請求項１〜５のいずれか一項に記載の照明装置。   The lighting apparatus according to claim 1, wherein the directional light source includes an LED. 前記指向性光源の照射光を前記一対の光調整部材によって前記一対の面状光透過部から面発光させる機能単位を複数備えることを特徴とする請求項１〜６のうちいずれか一項に記載の照明装置。   7. The apparatus according to claim 1, further comprising: a plurality of functional units that cause the pair of light adjusting members to emit surface light from the pair of planar light transmission portions by using the pair of light adjusting members. Lighting equipment.
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CN102478165A (en) * 2010-11-29 2012-05-30 展晶科技(深圳)有限公司 Lighting device
CN102748609A (en) * 2012-05-31 2012-10-24 鹤山市银雨照明有限公司 LED (light emitting diode) lamp
JP2012257149A (en) * 2011-06-10 2012-12-27 Aiphone Co Ltd Door intercom slave unit with camera
JP2015074416A (en) * 2013-10-11 2015-04-20 小島プレス工業株式会社 Vehicular lighting device

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JPH08262231A (en) * 1995-03-28 1996-10-11 Chikyu Kankyo Sangyo Gijutsu Kenkyu Kiko Hollow light emitting carrier
JPH1172625A (en) * 1997-06-30 1999-03-16 Toshiba Lighting & Technol Corp Back light and liquid crystal display device using it
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102478165A (en) * 2010-11-29 2012-05-30 展晶科技(深圳)有限公司 Lighting device
JP2012257149A (en) * 2011-06-10 2012-12-27 Aiphone Co Ltd Door intercom slave unit with camera
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JP2015074416A (en) * 2013-10-11 2015-04-20 小島プレス工業株式会社 Vehicular lighting device

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