JP2014086270A - Light-emitting device for plane illumination - Google Patents

Light-emitting device for plane illumination Download PDF

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JP2014086270A
JP2014086270A JP2012234333A JP2012234333A JP2014086270A JP 2014086270 A JP2014086270 A JP 2014086270A JP 2012234333 A JP2012234333 A JP 2012234333A JP 2012234333 A JP2012234333 A JP 2012234333A JP 2014086270 A JP2014086270 A JP 2014086270A
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light
guide box
bottom wall
emitting device
radial
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JP6033634B2 (en
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Hiroshi Urae
博志 浦江
Yoji Irie
洋司 入江
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Stanley Electric Co Ltd
Naito Shokai KK
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Stanley Electric Co Ltd
Naito Shokai KK
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Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device for plane illumination capable of uniformalizing light intensity distribution throughout the entire surface and simultaneously illuminating a surrounding area by leaking light.SOLUTION: A light-emitting device 1 for plane illumination comprises: a light guide box 2 having a bottom wall 2A and side walls 2B surrounding the bottom wall 2A; a light transmission plate 4 covering an opening 2b facing the bottom wall 2A; an LED light source 3 disposed on the bottom wall 2A of the light guide box 2. An opening part 2a (or a light transmission wall) is disposed at a part of one of the side walls 2B of the light guide box 2. The inner surfaces of the other side walls 2B and the bottom wall 2A are reflective surfaces. A radial light-shielding body 6 is disposed right above the LED light source 3 in the light guide box 2.

Description

本発明は、遊技ロゴ照明、看板バックライト照明等に使用される面照明発光装置に関するものである。   The present invention relates to a surface illumination light emitting device used for game logo illumination, signboard backlight illumination, and the like.

面照明発光装置の光源として、消費電力が小さくて高輝度及び高寿命であるＬＥＤ（発光ダイオード）が使用されつつあるが、ＬＥＤから出射される光は指向性が強いため、広い面で均一な光量分布を得ることが困難である。   As a light source for a surface illumination light emitting device, an LED (light emitting diode) with low power consumption, high luminance and long life is being used, but the light emitted from the LED is highly directional and uniform over a wide area. It is difficult to obtain a light amount distribution.

そこで、特許文献１には、端部に複数のＬＥＤを一定間隔で配置した透明アクリル板の表面の全面積内に、ＬＥＤからの光の入射方向に対して直角方向の多数の線状Ｖ形溝を相互に平行に連続状に並設し、このＶ形溝で入射光を散乱反射及び拡散屈折させる構成が提案されている。   Therefore, in Patent Document 1, a large number of linear V-shapes in a direction perpendicular to the incident direction of light from the LEDs are within the entire area of the surface of the transparent acrylic plate in which a plurality of LEDs are arranged at regular intervals on the end. A configuration has been proposed in which grooves are arranged in parallel in parallel with each other, and incident light is scattered and reflected and diffused and refracted by the V-shaped grooves.

又、特許文献２には、ＬＥＤを収容する光源収容部を有するランプハウジングとその開口部を覆う表示板との間に導光体を配置し、前記ランプハウジングの内側壁表面にシボ加工を施し、ＬＥＤからの光を導光体の内部で散乱させるとともに、ランプハウジングの内側壁に照射される光を乱反射させ、再び導光体内部で散乱させる構成が提案されている。   In Patent Document 2, a light guide is disposed between a lamp housing having a light source housing for housing LEDs and a display plate covering the opening, and the inner wall surface of the lamp housing is subjected to embossing. A configuration has been proposed in which light from the LED is scattered inside the light guide, and the light irradiated on the inner wall of the lamp housing is diffusely reflected and scattered again inside the light guide.

更に、特許文献３には、開口を有し内部に点光源を収容したケーシングの内面を反射面とし、点光源上の開口を塞ぐ部分に設けられた、一部光を透過し反射及び乱反射する外方反射部と、該外方反射部よりも高い反射率を有する光透過性の中央反射部とで、指向性の強い発光部から放射される中央部分の光量を制限し、均一な照明光を得る構成が提案されている。   Further, in Patent Document 3, an inner surface of a casing having an opening and containing a point light source is used as a reflection surface, and a part of light provided at a portion blocking the opening on the point light source is transmitted and reflected and diffusely reflected. Uniform illumination light by limiting the amount of light in the central part emitted from the light emitting part with strong directivity by the outer reflective part and the light transmissive central reflective part having a higher reflectance than the outer reflective part The structure which obtains is proposed.

特開平７−２７０６２４号公報JP 7-270624 A 特開２００３−１８６４２７号公報JP 2003-186427 A 特開２０１１−０４９１７６号公報JP 2011-049176 A

しかしながら、特許文献１において提案された構成では、光を導入する導光板である透明アクリル板の端面に、ＬＥＤ光の照射に起因するホットスポット（光の明るい局所）が存在し、面照明の明るさによってはホットスポットが顕著となり、面照明光の照度の均一性を確保することができないという問題がある。   However, in the configuration proposed in Patent Document 1, there is a hot spot (bright local area of light) due to the irradiation of LED light on the end face of the transparent acrylic plate, which is a light guide plate for introducing light, and brightness of surface illumination. Depending on the situation, the hot spot becomes conspicuous, and there is a problem that the illuminance uniformity of the surface illumination light cannot be secured.

又、特許文献２において提案された構成では、照明光の照度の均一性を得るためにはランプハウジングに或る程度の高さが必要であるため、装置が大型化するという問題がある。   Further, in the configuration proposed in Patent Document 2, there is a problem that the apparatus becomes large because the lamp housing needs to have a certain height in order to obtain the illuminance uniformity of the illumination light.

特許文献３には、図７に示すように、矩形ボックス状のケーシング１０２の上面開口部を覆う光透過基板１０４のＬＥＤ光源１０３（図８参照）の直上に同心円状の複数のスリット１０６ａが形成された遮光板（放射側反射部）１０６を配置する構成が提案されているが、これによれば図８に示すようにスリット１０６ａと遮光部が交互に分布しているため、光強度の調整が滑らかにできず、特にＬＥＤ光源１０３の付近では、遮光板１０６の広さは大きく設定しているため、光が通過する際に分断された光となり、光強度の差がより強くなる。その結果、遮光板１０６による影が形成され易くなり、光強度の均一性に悪影響を与える。   In Patent Document 3, as shown in FIG. 7, a plurality of concentric slits 106a are formed immediately above the LED light source 103 (see FIG. 8) of the light-transmitting substrate 104 that covers the upper surface opening of the rectangular box-shaped casing 102. A configuration has been proposed in which the light-shielding plate (radiation-side reflecting portion) 106 is arranged. According to this, the slits 106a and the light-shielding portions are alternately distributed as shown in FIG. In particular, in the vicinity of the LED light source 103, since the area of the light shielding plate 106 is set large, the light is divided when the light passes through, and the difference in light intensity becomes stronger. As a result, a shadow is easily formed by the light shielding plate 106, which adversely affects the uniformity of light intensity.

そこで、図９の側断面図に示すように、導光箱２０２の上面開口部を光透過板（アウタレンズ）２０４で覆い、導光箱２０２の底壁２０２Ａ上に複数のＬＥＤ光源２０３を配置するとともに、表裏に配光用のレンズカットが施されたインナレンズ２０５を配置し、各ＬＥＤ光源２０３から出射される光をインナレンズ２０５のレンズカットによる屈折によって拡散させて光透過板２０４から出射させる構成が提案される。   Therefore, as shown in the side sectional view of FIG. 9, the upper surface opening of the light guide box 202 is covered with a light transmission plate (outer lens) 204, and a plurality of LED light sources 203 are arranged on the bottom wall 202 </ b> A of the light guide box 202. At the same time, inner lenses 205 with light distribution lens cuts are arranged on the front and back sides, and the light emitted from each LED light source 203 is diffused by the refraction caused by the lens cuts of the inner lenses 205 and emitted from the light transmission plate 204. A configuration is proposed.

しかしながら、図９に示す構成によれば、各ＬＥＤ光源２０３の中心の光が強過ぎ、インナレンズ２０５だけでは光を十分拡散させることができず、均一な照明が不可能となる。   However, according to the configuration shown in FIG. 9, the light at the center of each LED light source 203 is too strong, and the inner lens 205 alone cannot sufficiently diffuse the light, and uniform illumination is impossible.

ところで、例えば遊技機等においては、図９に示した光透過板２０４に表示されたロゴを照明によって光らせることが行われているが、ロゴ全体を光らせるためにはＬＥＤ光源２０３を増やす必要がある。   By the way, in a gaming machine or the like, the logo displayed on the light transmission plate 204 shown in FIG. 9 is illuminated by illumination, but it is necessary to increase the number of LED light sources 203 to illuminate the entire logo. .

又、遊技機においてはロゴだけでなく、ロゴの外側部分（図９のＡ部分）を照らす演出が要求されるが、これを実現するために図９に示すように導光箱２０２の側壁２０２Ｂの一部を開口させ、この開口部２０２ａから漏れる光を利用してロゴの外側部分を照らすことが考えられる。   In addition, in the gaming machine, not only the logo but also the effect of illuminating the outer portion of the logo (A portion in FIG. 9) is required. To realize this, as shown in FIG. 9, the side wall 202B of the light guide box 202 is provided. It is conceivable to illuminate the outer portion of the logo using the light leaking from the opening 202a.

ところが、インナレンズ２０５は透明であるため、このインナレンズ２０５で反射して導光箱２０２の開口部２０２ａから漏れる光は少なく、又、ＬＥＤ光源２０３から開口部２０３ａに向かう光も殆どないため、ロゴの外側部分を十分照明することは不可能である。このため、ロゴの外側部分を十分照らすには、別のＬＥＤ光源を多数設置する必要がある。   However, since the inner lens 205 is transparent, there is little light reflected from the inner lens 205 and leaking from the opening 202a of the light guide box 202, and there is almost no light directed from the LED light source 203 to the opening 203a. It is impossible to fully illuminate the outer part of the logo. For this reason, in order to fully illuminate the outer part of a logo, it is necessary to install many different LED light sources.

本発明は上記問題に鑑みてなされたもので、その目的とする処は、光強度分布を全域に亘って均一化することができるとともに、漏れた光で周辺も同時に照明することができる面照明発光装置を提供することにある。   The present invention has been made in view of the above problems, and the object of the processing is surface illumination that can make the light intensity distribution uniform over the entire area and can simultaneously illuminate the periphery with leaked light. The object is to provide a light emitting device.

上記目的を達成するため、請求項１記載の発明は、底壁とその周囲に立設された側壁を備えた導光箱の前記底壁に対向する開口部を光透過板で覆うとともに、該導光箱内の底壁上にＬＥＤ光源を配置して成る面照明発光装置において、前記導光箱の前記側壁の少なくとも一部を開口させ或いは光透過壁とし、他の側壁及び前記底壁の内面を反射面とするとともに、該導光箱内の前記ＬＥＤ光源の直上に放射状遮光体を配置したことを特徴とする。   In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that an opening facing the bottom wall of a light guide box having a bottom wall and a side wall standing around the bottom wall is covered with a light transmission plate, In a surface illumination light emitting device in which an LED light source is disposed on a bottom wall in a light guide box, at least a part of the side wall of the light guide box is opened or used as a light transmission wall, and the other side walls and the bottom wall are formed. The inner surface is a reflective surface, and a radial light shielding body is disposed immediately above the LED light source in the light guide box.

請求項２記載の発明は、請求項１記載の発明において、前記放射状遮光体は、前記ＬＥＤ光源の直上に位置するブラインド部と、該ブラインド部の周囲から径方向外方に向かって放射状に延びる複数の遮光片とで構成されることを特徴とする。   According to a second aspect of the present invention, in the first aspect of the invention, the radial light blocking body includes a blind portion positioned immediately above the LED light source, and extends radially outward from the periphery of the blind portion. It is characterized by comprising a plurality of light shielding pieces.

請求項３記載の発明は、請求項２記載の発明において、前記放射状遮光体の遮光片を前記ブラインド部の中心から径方向に遠ざかるに従って幅が狭くなる形状に成形したことを特徴とする。   According to a third aspect of the present invention, in the second aspect of the present invention, the light shielding piece of the radial light shielding body is formed into a shape that becomes narrower as the distance from the center of the blind portion increases in the radial direction.

請求項４記載の発明は、請求項２又は３記載の発明において、前記放射状遮光体のブラインド部の中心部に孔を形成したことを特徴とする。   According to a fourth aspect of the present invention, in the second or third aspect of the present invention, a hole is formed in a central portion of the blind portion of the radial light shield.

本発明によれば、ＬＥＤ光源からの指向性の強い光は、放射状遮光体のブラインド部によって遮光され、光透過板に直射光が届かない部分が存在しても、放射状遮光体による光の反射と乱射による導光的な効果によって導光箱の内部において光強度が均一に混ぜられるため、放射状遮光体の複数の遮光片間に形成された複数のスリットを通過する強度の均一な光が光透過板の全面から出射されて照明に供される。即ち、放射状遮光体の複数の遮光片は、光の反射と透過のバランスを調整することによって、ブラインド部の周辺と導光箱の周辺における光強度の間の不整合を正す機能を果たす。   According to the present invention, the highly directional light from the LED light source is shielded by the blind portion of the radial light shield, and even if there is a portion where direct light does not reach the light transmission plate, the light is reflected by the radial light shield. The light intensity is evenly mixed inside the light guide box due to the light guide effect due to the turbulence, so that the light with uniform intensity passing through the plurality of slits formed between the plurality of light shielding pieces of the light shielding body is light. The light is emitted from the entire surface of the transmission plate and used for illumination. That is, the plurality of light shielding pieces of the radial light shielding body function to correct mismatch between the light intensity around the blind portion and the light guide box by adjusting the balance between light reflection and transmission.

又、導光箱の側壁の一部を開口させ或いは光透過壁としたため、放射状遮光体によって反射及び乱射した光が導光箱の側壁の一部から外部に漏れ、この漏れた光によって周辺を同時に十分照明することができる。   In addition, since a part of the side wall of the light guide box is opened or used as a light transmission wall, the light reflected and scattered by the radial light shield leaks outside from a part of the side wall of the light guide box, and the leaked light surrounds the periphery. It can be well illuminated at the same time.

本発明に係る面照明発光装置の側断面図である。It is a sectional side view of the surface illumination light-emitting device concerning this invention. 本発明に係る面照明発光装置の斜視図である。It is a perspective view of the surface illumination light-emitting device concerning this invention. 本発明に係る面照明発光装置の放射遮光体の平面図である。It is a top view of the radiation shielding body of the surface illumination light-emitting device which concerns on this invention. 本発明に係る面照明発光装置の放射遮光体のスリットを透過する光を示す部分斜視図である。It is a fragmentary perspective view which shows the light which permeate | transmits the slit of the radiation shielding body of the surface illumination light-emitting device which concerns on this invention. 本発明に係る面照明発光装置の放射状遮光体の別形態を示す平面図である。It is a top view which shows another form of the radial light shielding body of the surface illumination light-emitting device which concerns on this invention. 本発明に係る面照明発光装置の放射状遮光体別形態を示す斜視図である。It is a perspective view which shows the radial light-shielding body another form of the surface illumination light-emitting device which concerns on this invention. 従来の面照明発光装置の平面図である。It is a top view of the conventional surface illumination light-emitting device. 図７に示す面照明発光装置のスリットを透過する光を示す断面図である。It is sectional drawing which shows the light which permeate | transmits the slit of the surface illumination light-emitting device shown in FIG. 従来の面照明発光装置の側断面図である。It is a sectional side view of the conventional surface illumination light-emitting device.

以下に本発明の実施の形態を添付図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は本発明に係る面照明発光装置の側断面図、図２は同面照明発光装置の斜視図、図３は放射状遮光体の平面図、図４は同放射状遮光体のスリットを透過する光を示す部分斜視図である。   1 is a side sectional view of a surface illumination light emitting device according to the present invention, FIG. 2 is a perspective view of the surface illumination light emitting device, FIG. 3 is a plan view of the radial light shield, and FIG. 4 is transmitted through a slit of the radial light shield. It is a fragmentary perspective view which shows light.

本実施の形態に係る面照明発光装置１は、パチンコ台に使用されるロゴ表示用の装置であって、図１及び図２に示すように矩形ボックス状の導光箱２を備えており、この導光箱２は、方形の底壁２Ａとその周囲に立設された矩形の３つの側壁２Ｂによって構成されている。そして、この導光箱２の側部の３つの側壁２Ｂを除く面（図１に側面、図２の上面）は開口部２ａとして開口している。ここで、導光箱２の底壁２Ａと３つの側壁２Ｂの内面には反射処理が施されており、これらの底壁２Ａと側壁２Ｂの各内面は反射面を構成している。   The surface illumination light-emitting device 1 according to the present embodiment is a logo display device used for a pachinko machine, and includes a rectangular box-shaped light guide box 2 as shown in FIGS. 1 and 2. The light guide box 2 is composed of a rectangular bottom wall 2A and three rectangular side walls 2B provided upright around the square bottom wall 2A. And the surface (a side surface in FIG. 1, the upper surface of FIG. 2) except the three side walls 2B of the side part of this light guide box 2 is opened as an opening 2a. Here, the inner surface of the bottom wall 2A and the three side walls 2B of the light guide box 2 is subjected to reflection treatment, and the inner surfaces of the bottom wall 2A and the side walls 2B constitute a reflecting surface.

又、図１に示すように、導光箱２の底壁２Ａ上には複数（図示例では、２つ）のＬＥＤ光源３が配置されており、各ＬＥＤ光源３からは指向性の強い光が図１の上方に向かって出射される。尚、底壁２Ａと３つの側壁２Ｂの内面は光を拡散及び透過する例えば白色の反射面で構成しても良い。   Further, as shown in FIG. 1, a plurality of (two in the illustrated example) LED light sources 3 are arranged on the bottom wall 2 </ b> A of the light guide box 2, and light with strong directivity is emitted from each LED light source 3. Is emitted upward in FIG. The inner surfaces of the bottom wall 2A and the three side walls 2B may be constituted by, for example, a white reflecting surface that diffuses and transmits light.

又、導光箱２の底壁２Ａに対向する開口部２ｂ（図１の上面）は、光を拡散及び透過する例えば白色の光透過板（アウタレンズ）４で覆われており、この光透過板４には図２に示すように例えば「ＡＢＣ」のロゴが表示されている。そして、図１に示すように、導光箱２の内部には、光を透過するシート５が底壁２Ａに平行に設置されており、該シート５の各ＬＥＤ光源３の直上には、各ＬＥＤ光源３からの光を該ＬＥＤ光源３に向かって全反射させるための放射状遮光体６がそれぞれ配置されている。   An opening 2b (the upper surface in FIG. 1) facing the bottom wall 2A of the light guide box 2 is covered with, for example, a white light transmission plate (outer lens) 4 that diffuses and transmits light. For example, as shown in FIG. 2, a logo “ABC” is displayed at 4. As shown in FIG. 1, a light-transmitting sheet 5 is installed in the light guide box 2 in parallel with the bottom wall 2 </ b> A. Radial light shields 6 for totally reflecting light from the LED light source 3 toward the LED light source 3 are arranged.

上記各放射状遮光体６は、図３に示すように、ＬＥＤ光源３の直上に位置する円形のブラインド部６Ａと、該ブラインド部６Ａの周囲から径方向外方に向かって放射状に延びる複数の遮光片６Ｂとで構成されており、各遮光片６Ｂは、ブラインド部６Ａの中心から径方向に遠ざかるに従って幅が狭くなる針状に成形されている。従って、放射状遮光体６の各遮光片６Ｂの間には径方向外方に向かって放射状に延びる複数のスリット６ａが形成されており、各スリット６ａは各遮光片６Ｂとは逆にブラインド部６Ａの中心から径方向に遠ざかるに従って幅が広くなっている。   As shown in FIG. 3, each of the radial light shields 6 includes a circular blind portion 6A located immediately above the LED light source 3, and a plurality of light shields extending radially outward from the periphery of the blind portion 6A. Each light shielding piece 6B is formed in a needle shape whose width becomes narrower as it goes away from the center of the blind portion 6A in the radial direction. Therefore, a plurality of slits 6a extending radially outward are formed between the light shielding pieces 6B of the radial light shielding body 6, and each slit 6a is a blind portion 6A opposite to the light shielding pieces 6B. The width increases as the distance from the center increases.

又、導光箱２の側部の開口部２ａの周辺（図１のＡ部分）には、図２に示すようにパチンコ台の複数の釘７が配置されており、後述のように導光箱２の開口部２ａから漏れた光によって釘７やこれらの釘７を通過するパチンコ玉８が照明される。尚、本実施の形態では、導光箱２の側部の一部を開口部２ａとして開口させたが、この開口部２ａを光透過性の側壁で覆っても良い。   Further, a plurality of nails 7 of a pachinko machine are arranged around the opening 2a on the side of the light guide box 2 (A portion in FIG. 1), as shown in FIG. The nail 7 and the pachinko ball 8 passing through the nail 7 are illuminated by the light leaking from the opening 2 a of the box 2. In the present embodiment, a part of the side portion of the light guide box 2 is opened as the opening 2a. However, the opening 2a may be covered with a light transmissive side wall.

以上のように構成された面照明発光装置１において、各ＬＥＤ光源３から上方に向かって指向性の強い光が出射されると、その光は、その直上に配置された放射状遮光体６のブラインド部６Ａで全反射され、導光箱２の底壁２Ａと３つの側壁２Ｂの各反射面（内面）と放射状遮光体６との間で反射と乱射を繰り返しながら横方向に拡散してゆき、図４に示すように放射状遮光体６の複数の遮光片６Ｂ間に形成されたスリット６ａを通過して上方に向かい、光透過板４を透過して図１の上方へと出射されて照明に供される。ここで、放射状遮光体６の各スリット６ａは、前述のようにブラインド部６Ａの中心から径方向に遠ざかるに従って幅が広くなるよう連続的に形成されているため、このスリット６ａを通過する光が途中で遮られることがない。   In the surface illumination light-emitting device 1 configured as described above, when light having a high directivity is emitted upward from each LED light source 3, the light is blinded to the radial light shield 6 disposed immediately above the light. It is totally reflected by the part 6A and diffuses in the lateral direction while repeating reflection and scattering between the respective reflecting surfaces (inner surfaces) of the bottom wall 2A and the three side walls 2B of the light guide box 2 and the radial light shielding body 6, As shown in FIG. 4, the light passes through a slit 6a formed between a plurality of light shielding pieces 6B of the radial light shield 6 and passes upward, passes through the light transmitting plate 4 and is emitted upward in FIG. Provided. Here, since each slit 6a of the radial light shield 6 is continuously formed so as to increase in width as it moves away from the center of the blind portion 6A as described above, the light passing through the slit 6a There is no obstruction on the way.

而して、ＬＥＤ光源３から出射される指向性の強い光は、放射状遮光体６のブラインド部６Ａによって遮光され、光透過板４に直射光が届かない部分が存在しても、放射状遮光体６による光の反射と乱射による導光的な効果によって導光箱２の内部において光強度が均一に混ぜられるため、放射状遮光体６の複数の遮光片６Ｂの間に形成された複数のスリット６ａを通過する強度の均一な光が光透過板４の全面から出射されて該光透過板に表示された図２に示すロゴ「ＡＢＣ」の照明に供される。即ち、放射状遮光体６の複数の遮光片６Ｂは、光の反射と透過のバランスを調整することによって、放射状遮光体６のブラインド部６Ａの周辺と導光箱２の周辺における光強度の間の不整合を正す機能を果たす。   Thus, the highly directional light emitted from the LED light source 3 is shielded by the blind portion 6A of the radial light shield 6 and even if there is a portion where the direct light does not reach the light transmission plate 4, the radial light shield. Since the light intensity is uniformly mixed inside the light guide box 2 by the light guide effect due to the reflection of light by 6 and the scattering, the plurality of slits 6a formed between the plurality of light shielding pieces 6B of the radial light shielding body 6 Light having a uniform intensity passing through the light is emitted from the entire surface of the light transmission plate 4 and used for illumination of the logo “ABC” shown in FIG. 2 displayed on the light transmission plate. That is, the plurality of light shielding pieces 6B of the radial light shielding body 6 adjust the balance between the reflection and transmission of light so that the light intensity between the periphery of the blind portion 6A of the radial light shielding body 6 and the light intensity around the light guide box 2 is reduced. Serves to correct inconsistencies.

又、本実施の形態に係る面照明発光装置１においては、導光箱２の側部を開口させたため、放射状遮光体６によって反射及び乱射した光が図１及び図２に示すように導光箱２の側部の開口部２ａから外部に漏れ、この漏れた光によって周辺（図２に示す釘７やパチンコ玉８）を同時に十分照明することができる。   Moreover, in the surface illumination light-emitting device 1 which concerns on this Embodiment, since the side part of the light guide box 2 was opened, the light reflected and scattered by the radial light-shielding body 6 is guided as shown in FIG.1 and FIG.2. It leaks outside from the opening part 2a of the side part of the box 2, and the periphery (the nail 7 and the pachinko ball 8 shown in FIG. 2) can be sufficiently illuminated simultaneously by this leaked light.

尚、放射状遮光体６のブラインド部６Ａ部分の光強度が導光箱２の周辺よりも低い場合には、図５に示すように、ブラインド部６Ａの領域に径方向外郭から内側に向かってスリット６ｂを入れることによって光強度を調整する。スリット６ｂの幅は可能な限り細く、光強度が足りない場合は対称位置に本数を増やせば良い。これにより、均一発光が可能となる。又、ブラインド部６Ａの中心領域に小径の孔を開けて光強度を調整しても良い。光強度が足りない場合には、図６に示すように対称位置に複数の孔６ｃを形成すれば良い。或いは、ブラインド部６Ａの径を縮小して光強度を調整しても良い。逆に、放射状遮光体６のブラインド部６Ａ部分の光強度が導光箱２の周辺よりも高い場合には、ブラインド部６Ａの径を拡大すれば良い。   When the light intensity of the blind portion 6A portion of the radial light shield 6 is lower than that of the periphery of the light guide box 2, as shown in FIG. The light intensity is adjusted by inserting 6b. The width of the slit 6b is as narrow as possible. If the light intensity is insufficient, the number of the slits 6b may be increased to a symmetrical position. Thereby, uniform light emission is possible. Further, the light intensity may be adjusted by making a small-diameter hole in the central region of the blind portion 6A. If the light intensity is insufficient, a plurality of holes 6c may be formed at symmetrical positions as shown in FIG. Alternatively, the light intensity may be adjusted by reducing the diameter of the blind portion 6A. On the contrary, when the light intensity of the blind portion 6A portion of the radial light shield 6 is higher than that around the light guide box 2, the diameter of the blind portion 6A may be enlarged.

又、本実施の形態では、放射状遮光体６の複数の遮光片６Ｂを放射状に直線的に延びる針状に形成したが、遮光片６Ｂは同一方向に曲がった形状であっても、導光箱２の内部形状に相似しない形状であっても良い。又、本実施の形態では、遮光片６Ｂの形状については針状であるとして説明したが、径方向に遠ざかるに従って幅が狭くなっていれば良く、必ずしも針状である必要はない。例えば、針の先端を切り落とした形状等であっても良い。   Further, in the present embodiment, the plurality of light shielding pieces 6B of the radial light shielding body 6 are formed in needles extending radially linearly, but the light shielding pieces 6B may be bent in the same direction even if they are bent in the same direction. The shape may not be similar to the internal shape of 2. Further, in the present embodiment, the shape of the light shielding piece 6B has been described as being needle-shaped, but it is only necessary that the width becomes narrower as the distance from the radial direction increases, and it is not always necessary to be needle-shaped. For example, the shape which cut off the front-end | tip of a needle | hook etc. may be sufficient.

ところで、放射状遮光体６と光透過板４の光出射面との距離ｈ１と放射状遮光体６とＬＥＤ光源３との距離ｈ２（図１参照）は、本発明の効果を得るための重要な要素となる。具体的には、距離ｈ１が小さ過ぎて放射状遮光体６と光透過板４が近接する場合には、放射状遮光体６の模様が影として光透過板４に投影され、距離ｈ１を大きくすることによってより均一な光強度を得易くなる。又、距離ｈ２が小さ過ぎると、取り出すことができる光束の量が少なくなり、距離ｈ２を大きくすることによって、取り出す光束の量を多くすることができる。但し、距離ｈ２を大きくし過ぎると、放射状遮光体６による遮光効果が弱くなる。   By the way, the distance h1 between the radial light shield 6 and the light emitting surface of the light transmission plate 4 and the distance h2 between the radial light shield 6 and the LED light source 3 (see FIG. 1) are important factors for obtaining the effects of the present invention. It becomes. Specifically, when the distance h1 is too small and the radial light shield 6 and the light transmission plate 4 are close to each other, the pattern of the radial light shield 6 is projected as a shadow on the light transmission plate 4 to increase the distance h1. This makes it easier to obtain a more uniform light intensity. If the distance h2 is too small, the amount of light beam that can be extracted decreases, and by increasing the distance h2, the amount of light beam that can be extracted can be increased. However, if the distance h2 is too large, the light shielding effect by the radial light shield 6 is weakened.

導光箱２の高さｈは（ｈ１＋ｈ２）となるが、前記のことから導光箱２の高さｈが高いほど、面照明に供せられる光束の量及び光強度の均一性に対しては有利である。   The height h of the light guide box 2 is (h1 + h2). From the above, the higher the height h of the light guide box 2, the more the amount of light beam used for surface illumination and the uniformity of the light intensity. Is advantageous.

１ 面照明発光装置
２ 導光箱
２Ａ 導光箱の底壁
２Ｂ 導光箱の側壁
２ａ，２ｂ 導光箱の開口部
３ ＬＥＤ光源
４ 光透過板
５ シート
６ 放射状遮光体
６Ａ 放射状遮光体のブラインド部
６Ｂ 放射状遮光体の遮光片
６ａ，６ｂ 放射状遮光体のスリット
６ｃ 放射状遮光体の孔
７ 釘
８ パチンコ玉
ｈ 導光箱の高さ
Ｌ１ 放射状遮光体と光透過板との距離
Ｌ２ 放射状遮光体とＬＥＤ光源との距離
DESCRIPTION OF SYMBOLS 1 Surface illumination light-emitting device 2 Light guide box 2A Bottom wall of light guide box 2B Side wall of light guide box 2a, 2b Opening part of light guide box 3 LED light source 4 Light transmissive plate 5 Sheet 6 Radial light shielding body 6A Radial light shielding body blind Part 6B Radial shading piece 6a, 6b Radial shading slit 6c Radial shading hole 7 Nail 8 Pachinko ball h Light guide box height L1 Distance between radial shading body and light transmission plate L2 Radiation shading body and Distance to LED light source

Claims (4)

底壁とその周囲に立設された側壁を備えた導光箱の前記底壁に対向する開口部を光透過板で覆うとともに、該導光箱内の底壁上にＬＥＤ光源を配置して成る面照明発光装置において、
前記導光箱の前記側壁の少なくとも一部を開口させ或いは光透過壁とし、他の側壁及び前記底壁の内面を反射面とするとともに、該導光箱内の前記ＬＥＤ光源の直上に放射状遮光体を配置したことを特徴とする面照明発光装置。 An opening facing the bottom wall of the light guide box having a bottom wall and a side wall standing around the bottom wall is covered with a light transmission plate, and an LED light source is disposed on the bottom wall in the light guide box. In the surface illumination light emitting device comprising:
At least a part of the side wall of the light guide box is opened or used as a light transmission wall, and the inner surfaces of the other side walls and the bottom wall are used as reflection surfaces, and the light is shielded directly above the LED light source in the light guide box. A surface illumination light emitting device characterized in that a body is arranged. 前記放射状遮光体は、前記ＬＥＤ光源の直上に位置するブラインド部と、該ブラインド部の周囲から径方向外方に向かって放射状に延びる複数の遮光片とで構成されることを特徴とする請求項１記載の面照明発光装置。   The radial shield is composed of a blind portion located immediately above the LED light source, and a plurality of light shielding pieces extending radially outward from the periphery of the blind portion. The surface illumination light-emitting device according to 1. 前記放射状遮光体の遮光片を前記ブラインド部の中心から径方向に遠ざかるに従って幅が狭くなる形状に成形したことを特徴とする請求項２記載の面照明発光装置。   3. The surface illumination light-emitting device according to claim 2, wherein the light-shielding piece of the radial light-shielding body is formed into a shape that becomes narrower as the distance from the center of the blind portion is increased in the radial direction. 前記放射状遮光体のブラインド部の中心部に孔を形成したことを特徴とする請求項２又は３記載の面照明発光装置。
The surface illumination light-emitting device according to claim 2, wherein a hole is formed in a central portion of the blind portion of the radial light blocking body.
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Publication number Priority date Publication date Assignee Title
CN110828634A (en) * 2019-11-20 2020-02-21 宁波纬智光电科技有限公司 Planar 180-degree luminous surface mounted LED

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Publication number Priority date Publication date Assignee Title
JP2010282852A (en) * 2009-06-04 2010-12-16 Opt Design:Kk Surface illumination light source device and surface illumination device having plurality of surface illumination light source devices
JP2012174634A (en) * 2011-02-24 2012-09-10 Sharp Corp Light source module and optical member

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010282852A (en) * 2009-06-04 2010-12-16 Opt Design:Kk Surface illumination light source device and surface illumination device having plurality of surface illumination light source devices
JP2012174634A (en) * 2011-02-24 2012-09-10 Sharp Corp Light source module and optical member

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110828634A (en) * 2019-11-20 2020-02-21 宁波纬智光电科技有限公司 Planar 180-degree luminous surface mounted LED

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