JP2007273222A - Planar light source - Google Patents

Planar light source Download PDF

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JP2007273222A
JP2007273222A JP2006096598A JP2006096598A JP2007273222A JP 2007273222 A JP2007273222 A JP 2007273222A JP 2006096598 A JP2006096598 A JP 2006096598A JP 2006096598 A JP2006096598 A JP 2006096598A JP 2007273222 A JP2007273222 A JP 2007273222A
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light source
transmission control
rod
planar light
control member
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Mitsuaki Kawada
光昭 川田
Hirokazu Sakurai
宏和 櫻井
Minoru Mano
稔 真野
Takayuki Nishiyama
貴之 西山
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TECH MONO KK
Nippo Electric Co Ltd
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TECH MONO KK
Nippo Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To keep luminance irregularity extremely low, in a planar light source composed by arranging a plurality of rod-like light sources in parallel with one another. <P>SOLUTION: This planar light source 10 is composed of: the plurality of rod-like light sources 13 arranged in parallel with one another in a direction intercrossing respective long axes thereof in a nearly constant plane; transmission control members 14 each arranged in a form extending along the light source 13 on its front side for every light source 13 by increasing transmittance thereof toward a part separated from the light source 13; plate-like translucent members 15 each arranged by being tilted with respect to the plane by being brought into a state where one end is positioned in the vicinity of one side end of one of the transmission control members 14 extending along the light source, and the other end is located in a position adjacent to the plane relative to the one end; a diffusion plate 16 arranged on the front side of the translucent members 15 and the transmission control members 14; and a reflecting member 18 arranged on the rear side of the plurality of rod-like light sources 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は面状光源に関し、特に詳細には、棒状光源が複数並設されてなる面状光源に関するものである。   The present invention relates to a planar light source, and more particularly to a planar light source in which a plurality of rod-shaped light sources are arranged side by side.

従来、例えば広告用ディスプレイや室内照明用に、面状光源が広範に利用されている。そのような面状光源としては、ＥＬ（エレクトロ・ルミネッセンス）光源のように発光体自体が面状になっているものの他に、複数の蛍光ランプ等の棒状光源を並設して用いるものも知られている。   Conventionally, planar light sources have been widely used, for example, for advertising displays and indoor lighting. As such a planar light source, in addition to a light emitter itself having a planar shape such as an EL (electroluminescence) light source, a light source that uses a plurality of rod-shaped light sources such as fluorescent lamps in parallel is also known. It has been.

この後者の面状光源は基本的に、一例として特許文献１に示されるように、略一定の平面内において、それぞれの長軸と交わる方向（多くの場合は直交する方向）に並べて複数の棒状光源を配置し、それらの前方側つまり光取り出し側に、輝度を均一化する乳白色半透明板等の拡散板を配置するとともに、光源の後方側には反射部材を配して構成されたものである。そのような構成の面状光源においては、上記拡散板等による輝度均一化の効果が低いと、棒状光源に近い部分では輝度が高く、遠い部分では輝度が低いというように、輝度ムラが発生することになる。   This latter planar light source is basically a plurality of rods arranged in a direction (in many cases orthogonal to each other) intersecting each major axis in a substantially constant plane as shown in Patent Document 1 as an example. A light source is arranged, and a diffusion plate such as a milky white translucent plate that equalizes the luminance is arranged on the front side, that is, the light extraction side, and a reflecting member is arranged on the rear side of the light source. is there. In the planar light source having such a configuration, if the effect of uniforming the luminance by the diffuser plate is low, luminance unevenness occurs such that the luminance is high in the portion close to the rod-shaped light source and low in the far portion. It will be.

そこで従来、上記特許文献１にも示されているように、棒状光源の前方側において光源に沿って延びる状態にして、光源から遠い部分ほどより高透過率とされた透過制御部材を配設しておくことも提案されている。なお、ここで言う「透過率」とは、光学的な透過率そのものを指す他、光学的な透過率（反射率）は一定の部材において開口率が調整されることにより、単位面積当たりの光透過の程度が変えられている場合において、その光透過の程度の大小をも指すものとする。   Therefore, conventionally, as also shown in Patent Document 1, a transmission control member having a higher transmittance at a portion farther from the light source is disposed in a state extending along the light source on the front side of the rod-shaped light source. It is also proposed to keep it. The term “transmittance” as used herein refers to the optical transmittance itself, and the optical transmittance (reflectance) is light per unit area by adjusting the aperture ratio in a fixed member. When the degree of transmission is changed, the magnitude of the degree of light transmission is also indicated.

具体的にこの透過制御部材は、例えば透明部材にドット状の反射部材を多数貼り付け、その密度を光源に近い位置ではより高く、遠い位置ではより低く設定する等によって、上述のような光透過の程度の分布を得るものである。そのような透過制御部材を備えた面状光源においては、棒状光源から真っ直ぐ、あるいはそれに近い角度で前方に出射する光の多くは透過制御部材で反射して後方の種々の方向に戻り、光源後方の反射部材で反射してから前方に出射するのに対し、棒状光源から斜め方向に出射した光の多くは透過制御部材をそのまま透過して反射は少なくなるので、本来光源に近いほど高輝度となる傾向を補償して輝度均一化の効果が得られる。
特開平１１−３２９０２３号公報 Specifically, this transmission control member is formed by, for example, attaching a large number of dot-like reflection members to a transparent member, and setting the density higher at a position close to the light source and lower at a position far from the light source. The distribution of the degree is obtained. In a planar light source equipped with such a transmission control member, most of the light emitted straight forward from the rod-like light source at an angle close to that is reflected by the transmission control member and returned to various directions behind the light source. In contrast, most of the light emitted obliquely from the rod-shaped light source is transmitted through the transmission control member as it is, and the reflection is reduced. Thus, the effect of uniforming the luminance can be obtained.
Japanese Patent Laid-Open No. 11-329023

上に述べた特許文献１に示される構造は、面状光源の輝度を均一化する上で一定の効果を有するものであるが、輝度ムラを低減する上でさらに改良の余地が残されている。   The structure shown in Patent Document 1 described above has a certain effect in making the luminance of the planar light source uniform, but there is still room for improvement in reducing luminance unevenness. .

本発明は上記の事情に鑑みてなされたものであり、複数の棒状光源を並設してなる面状光源において、輝度ムラを極めて低く抑えることを目的とする。   The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress unevenness in luminance in a planar light source formed by arranging a plurality of rod-shaped light sources in parallel.

本発明による面状光源は、先に述べたように棒状光源と拡散板との間に透過制御部材を配設してなる面状光源において、透過制御部材の側方にさらに板状の透光性部材を配置して、それにより輝度均一化効果を高めたものであり、より具体的には、
略一定の平面内において、それぞれの長軸と交わる方向に並べて配置された複数の棒状光源と、
該光源の１つ毎に、その前方側つまり光取り出し側において、光源に沿って延びる状態に配置された透過制御部材と、
１つの透過制御部材の光源に沿って延びる一側端近傍に一端が位置し、他端が前記一端と比べてより前記平面に近い位置に有る状態にして、該平面に対して傾けて配置された板状の透光性部材と、
この透光性部材および前記透過制御部材の前方側に配置された拡散板と、
前記複数の棒状光源の後方側に配された反射部材とからなることを特徴とするものである。 The planar light source according to the present invention is a planar light source in which a transmission control member is disposed between a rod-shaped light source and a diffusion plate as described above, and further a plate-shaped light transmission on the side of the transmission control member. The characteristic member is arranged, thereby improving the luminance uniforming effect, more specifically,
A plurality of rod-like light sources arranged side by side in a direction intersecting with each major axis in a substantially constant plane;
For each one of the light sources, on its front side, that is, on the light extraction side, a transmission control member arranged in a state extending along the light source,
One transmission control member is disposed at one end near one end extending along the light source, and the other end is positioned closer to the plane than the one end, and is inclined with respect to the plane. A plate-like translucent member;
A diffusing plate disposed on the front side of the translucent member and the transmission control member;
And a reflecting member disposed on the rear side of the plurality of rod-shaped light sources.

なお上記の透光性部材は、例えばアクリル板等から形成することができる。また上記透過制御部材としては、光源からの光を反射する反射部材に多数の孔が形成され、それらの孔の開口率を調整することによって透過率が調整されたもの等を好適に用いることができる。   In addition, said translucent member can be formed from an acrylic board etc., for example. Further, as the transmission control member, it is preferable to use a member in which a number of holes are formed in a reflection member that reflects light from a light source, and the transmittance is adjusted by adjusting the aperture ratio of the holes. it can.

一方、上記複数の棒状光源は、例えばそれぞれの長軸と直交する方向に並べて配置される。また該複数の棒状光源としては、例えば蛍光ランプを適用することができる。   On the other hand, the plurality of rod-shaped light sources are arranged side by side, for example, in a direction orthogonal to the respective long axes. As the plurality of rod-shaped light sources, for example, a fluorescent lamp can be applied.

また上記透過制御部材は、透光性部材と同一の部材に透過制御機能を直接付与することにより形成されたものであってもよい。より具体的には、透光性部材と同一の部材（透明アクリル板等）にスクリーン印刷を施して透過制御機能を付与し、その部分を透過制御部材とすることができる。   The transmission control member may be formed by directly imparting a transmission control function to the same member as the translucent member. More specifically, the same member (transparent acrylic plate or the like) as the translucent member can be screen-printed to provide a transmission control function, and that portion can be used as the transmission control member.

本発明による面状光源は、光源の１つ毎に、その前方側において光源に沿って延びる状態に配置された透過制御部材を有しているので、先に説明した特許文献１に示される面状光源におけるのと同様にして、輝度均一化の効果を得ることができる。   Since the planar light source according to the present invention has the transmission control member arranged in a state extending along the light source on the front side of each of the light sources, the surface shown in Patent Document 1 described above. The effect of uniforming the luminance can be obtained in the same manner as in the light source.

本発明による面状光源はそれに加えてさらに、１つの透過制御部材の光源に沿って延びる一側端近傍に一端が位置し、他端が前記一端と比べてより前記平面（棒状光源が並んでいる平面）に近い位置に有る状態にして、該平面に対して傾けて配置された板状の透光性部材と、複数の棒状光源の後方側に配された反射部材とを備えているので、棒状光源から透光性部材を通過する方向に斜め前方に出射した光の一部が、この透光性部材の表面で反射して後方側に戻り、さらに反射部材で反射して前方側に出射するようになる。つまり、棒状光源から斜め前方に出射した光の一部が、上記透光性部材および反射部材が無い場合と比べて、より側方側に拡がって出射するようになるので、輝度均一化の効果がより高くなり、輝度ムラを極めて低く抑えることが可能となる。   In addition to this, the planar light source according to the present invention has one end positioned near one side end extending along the light source of one transmission control member, and the other end is more flat than the one end. A plate-like translucent member disposed at a position close to the plane and a reflecting member disposed on the rear side of the plurality of rod-shaped light sources. A part of the light emitted obliquely forward from the rod-shaped light source in the direction passing through the translucent member is reflected by the surface of the translucent member and returned to the rear side, and further reflected by the reflective member to the front side. It comes out. In other words, a part of the light emitted obliquely forward from the rod-shaped light source spreads more laterally than the case where there is no translucent member and no reflecting member, so that the effect of uniforming the luminance is achieved. Becomes higher, and the luminance unevenness can be suppressed extremely low.

また特に上記透過制御部材が、透光性部材と同一の部材に透過制御機能を直接付与することにより形成されたものである場合は、それら両部材が一体化したことにより保守点検等が容易になるとともに、上記課題を解決できる面状光源を安価に得ることができるという効果も得られる。   In particular, when the transmission control member is formed by directly imparting a transmission control function to the same member as the translucent member, maintenance and inspection can be facilitated by integrating these two members. In addition, an effect is obtained that a planar light source that can solve the above-described problems can be obtained at a low cost.

以下、図面を参照して本発明の実施形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１および図２はそれぞれ、本発明の一実施形態による面状光源10を示す一部破断斜視図および一部破断立面図である。図示の通りこの面状光源10は、矩形の有底箱状に形成されたケース11と、このケース11の底板11ａ上に取付け器具12（図１では省略）を介して固定された複数の直管状蛍光ランプ13と、この蛍光ランプ13の１つ毎にその前方側（光取り出し側で、図中上方側）に配置された透過制御部材14と、１つの透過制御部材14の一側端（つまり蛍光ランプ13の並び方向の端部）から外に張り出した部分15ａを有する透明アクリル板15と、この透明アクリル板15および上記透過制御部材14の前方側に配置されて周縁部がケース11に固定された拡散板16と、その上に配置された透明カバー板17と、複数の蛍光ランプ13の後方側に配されてケース底板11ａの上に固定された反射部材18とから構成されている。   1 and 2 are a partially broken perspective view and a partially broken elevation view, respectively, showing a planar light source 10 according to an embodiment of the present invention. As shown in the figure, the planar light source 10 includes a case 11 formed in a rectangular bottomed box shape, and a plurality of direct light sources fixed on the bottom plate 11a of the case 11 via attachment devices 12 (not shown in FIG. 1). A tubular fluorescent lamp 13, a transmission control member 14 disposed on the front side of each fluorescent lamp 13 (on the light extraction side, the upper side in the drawing), and one side end of one transmission control member 14 ( In other words, the transparent acrylic plate 15 having a portion 15a projecting outward from the end of the fluorescent lamp 13 in the arrangement direction) and the peripheral portion of the transparent acrylic plate 15 and the transmission control member 14 are arranged on the front side of the transparent control plate 14 and the case 11. It comprises a fixed diffusion plate 16, a transparent cover plate 17 disposed thereon, and a reflecting member 18 disposed on the rear side of the plurality of fluorescent lamps 13 and fixed on the case bottom plate 11a. .

本実施形態における蛍光ランプ13は一例として直径８ｍｍの冷陰極ランプであり、同じ長さのものが４本、各長軸と直交する方向に並べて、各々ケース底板11ａから等距離の位置に配されている。すなわち本例では、これらの蛍光ランプ13が、ケース底板11ａと平行な一平面内に各ランプ長軸が含まれる状態に配置されている。   The fluorescent lamp 13 in this embodiment is a cold cathode lamp having a diameter of 8 mm as an example, and four lamps having the same length are arranged in a direction perpendicular to each major axis, and are arranged at equal distances from the case bottom plate 11a. ing. That is, in this example, these fluorescent lamps 13 are arranged in a state in which the major axes of the lamps are included in one plane parallel to the case bottom plate 11a.

透過制御部材14は図３に詳しく示す通り、表面に高反射率の白色塗装が施された略長方形状の金属板に多数の小孔14ａが形成されてなるパンチングメタルであり、その長手方向が蛍光ランプ13の長軸と平行となる向きにして、該蛍光ランプ13に沿って延びるように配設されている。本例において小孔14ａは、透過制御部材14の長手方向（図３の左右方向）に一列に延び、このような列が透過制御部材14の幅方向（図３の上下方向）に合計９列並ぶように設けられている。そして小孔14ａの径は、蛍光ランプ13に最も近い所に位置する中央列の小孔14ａが最も小さく、透過制御部材14の幅方向外側に行くにつれてより大きくなるように設定されている。つまり小孔14ａの径は５通り（最外側のみ半円形状）とされ、それらの径は一例として３ｍｍ、３．５ｍｍ、４ｍｍ、５ｍｍ、６ｍｍとされている。   As shown in detail in FIG. 3, the transmission control member 14 is a punching metal in which a large number of small holes 14a are formed in a substantially rectangular metal plate having a high-reflectance white coating on the surface, and the longitudinal direction thereof is The fluorescent lamp 13 is disposed so as to extend along the fluorescent lamp 13 in a direction parallel to the long axis of the fluorescent lamp 13. In this example, the small holes 14a extend in a row in the longitudinal direction of the permeation control member 14 (left and right direction in FIG. 3), and such a row has a total of nine rows in the width direction of the permeation control member 14 (vertical direction in FIG. 3). It is provided to line up. The diameter of the small holes 14a is set so that the small holes 14a in the central row located closest to the fluorescent lamp 13 are the smallest and become larger as going outward in the width direction of the transmission control member 14. That is, the diameters of the small holes 14a are five (semicircular shape only on the outermost side), and the diameters are 3 mm, 3.5 mm, 4 mm, 5 mm, and 6 mm as an example.

一方透明アクリル板15は、1枚の部材を２箇所で折り曲げて断面傘状に形成されたものであり、その中央部15ｂに上記透過制御部材14が固定されている。この中央部15ｂの左右外側に位置する張出し部15ａは、１つの透過制御部材14の蛍光ランプ13に沿って延びる一側端近傍に一端が位置し、他端が上記一端と比べてより前記平面（蛍光ランプ13の各長軸を含む面）に近い位置に有る状態にして、該平面に対し傾けて配置されている。   On the other hand, the transparent acrylic plate 15 is formed by bending one member at two locations to form a cross-sectional umbrella shape, and the transmission control member 14 is fixed to the central portion 15b. The overhanging portion 15a located on the left and right outer sides of the central portion 15b has one end positioned near one end extending along the fluorescent lamp 13 of one transmission control member 14, and the other end is more flat than the one end. In a state close to (a surface including each major axis of the fluorescent lamp 13), the fluorescent lamp 13 is disposed so as to be inclined with respect to the plane.

拡散板16は、例えば乳白色の半透明アクリル板等から形成されたものである。また、その上の透明カバー板17は、透明アクリル板等から形成されて拡散板16を保護する。なお、本実施形態の面状光源10が通常の照明用に使用される場合は、上記構成の透明カバー板17をそのまま適用できるが、広告看板等のディスプレイを裏側から照明する光源として用いられる場合は、上記透明カバー板17に代えて、広告等の表示がなされたディスプレイ体を適用すればよい。あるいは、そのようなディスプレイ体を、透明カバー板17の上下にさらに重ねて配置してもよい。   The diffusion plate 16 is made of, for example, a milky white translucent acrylic plate. Further, the transparent cover plate 17 thereon is formed of a transparent acrylic plate or the like and protects the diffusion plate 16. When the planar light source 10 of the present embodiment is used for normal illumination, the transparent cover plate 17 having the above configuration can be applied as it is, but when used as a light source for illuminating a display such as an advertising billboard from the back side. Instead of the transparent cover plate 17, a display body on which an advertisement or the like is displayed may be applied. Alternatively, such a display body may be disposed so as to overlap the upper and lower sides of the transparent cover plate 17.

反射部材18は透過制御部材14と同様に、表面に高反射率の白色塗装が施された金属板あるいは樹脂板等から形成されたものである。   Similar to the transmission control member 14, the reflection member 18 is formed of a metal plate or a resin plate having a white coating with a high reflectance on the surface.

以下、上記構成を有する本実施形態の面状光源10の作用について説明する。拡散板16は、図２に示すように各蛍光ランプ13から発せられた光Ｌ１を拡散させることにより、該拡散板16の略全面から出射する光の輝度をその面内において均一化する。また、各蛍光ランプ13から後方側に出射した光Ｌ２は、反射部材18で反射してから前方側に出射し、その光路はまちまちなものとなって拡散板16に至るので、この点からも、拡散板16の面内の輝度を均一化する効果が得られる。   Hereinafter, the operation of the planar light source 10 of the present embodiment having the above configuration will be described. As shown in FIG. 2, the diffusion plate 16 diffuses the light L1 emitted from each fluorescent lamp 13, thereby making the luminance of light emitted from substantially the entire surface of the diffusion plate 16 uniform in the plane. Further, the light L2 emitted from each fluorescent lamp 13 to the rear side is reflected by the reflecting member 18 and then emitted to the front side, and its optical path becomes different and reaches the diffuser plate 16. From this point as well, Thus, the effect of making the in-plane luminance of the diffusion plate 16 uniform can be obtained.

また、蛍光ランプ13から前方側に出射した光の一部は、図中Ｌ３で示すように透過制御部材14で反射し、あるいはそこに形成された複数の小孔14ａをそのまま通過するが、それらの小孔14ａが前述の通りに形成されていることにより、さらなる輝度均一化の効果が得られる。すなわちこの透過制御部材14において、蛍光ランプ13に近いその幅方向中央部近辺では小孔14ａの開口率が低く、蛍光ランプ13から遠い側端部に行くにつれてこの開口率が高くなっているので、透過制御部材14の幅方向中央部では光がより多く反射して透過し難く、幅方向外側に行くほど光が反射し難くなって、より多くの光が透過するようになっている。そこで、本来蛍光ランプ13に近いほど高輝度となる傾向を補償して、拡散板16の面内の輝度をさらに均一化する効果が得られる。   Further, a part of the light emitted from the fluorescent lamp 13 to the front side is reflected by the transmission control member 14 as indicated by L3 in the figure, or passes through the plurality of small holes 14a formed there. Since the small holes 14a are formed as described above, the effect of further uniforming the luminance can be obtained. That is, in this transmission control member 14, the aperture ratio of the small hole 14a is low in the vicinity of the central portion in the width direction close to the fluorescent lamp 13, and the aperture ratio increases as it goes to the side end far from the fluorescent lamp 13. At the central portion in the width direction of the transmission control member 14, more light is reflected and hardly transmitted, and the light is less reflected as it goes outward in the width direction, so that more light is transmitted. Therefore, it is possible to obtain an effect of compensating the tendency of higher brightness as it is closer to the fluorescent lamp 13 and making the brightness in the surface of the diffusion plate 16 more uniform.

なお、以上述べたパンチングメタルからなる透過制御部材14に代えて、光学的な透過率が、蛍光ランプ13から遠くの部分ほど高くなるように調整された透過制御部材を用いても、基本的に同様の効果を得ることができる。   In place of the transmission control member 14 made of the punching metal described above, a transmission control member that is adjusted so that the optical transmittance is higher in a portion far from the fluorescent lamp 13 can be basically used. Similar effects can be obtained.

以上のことに加えて本実施形態の面状光源10では、前述した透明アクリル板15が設けられていることにより、より一層高い輝度均一化効果が得られている。以下、その点について詳しく説明する。図３に示す通り、蛍光ランプ13から前方側に出射して特にこの透明アクリル板15（具体的にはその張出し部15ａ）に入射した光Ｌ４の多くは、そのまま該透明アクリル板15を透過して拡散板16に入射するが、一部はこの透明アクリル板15の表面で反射して後方側に戻り、反射部材18で反射してから前方側に出射する。つまり、透明アクリル板15の張出し部15ａに向かって出射した光Ｌ４は、もしこの透明アクリル板15が無ければ全部がそのままの光路で進行するが、該透明アクリル板15が設置されていることにより一部が本来の光路から分岐し、光路が多様化した上で拡散板16に入射するので、この点から輝度均一化の効果がより高められることになる。   In addition to the above, in the planar light source 10 of the present embodiment, the above-described transparent acrylic plate 15 is provided, so that an even higher luminance uniforming effect is obtained. Hereinafter, this point will be described in detail. As shown in FIG. 3, most of the light L4 emitted from the fluorescent lamp 13 to the front side and particularly incident on the transparent acrylic plate 15 (specifically, the projecting portion 15a) passes through the transparent acrylic plate 15 as it is. However, a part of the light is reflected by the surface of the transparent acrylic plate 15 and returned to the rear side, and is reflected by the reflecting member 18 and then emitted to the front side. That is, the light L4 emitted toward the projecting portion 15a of the transparent acrylic plate 15 travels in its entirety in the optical path if the transparent acrylic plate 15 is not provided. A part of the light branches off from the original optical path, and the light path is diversified before entering the diffuser plate 16. From this point, the effect of uniforming the luminance is further enhanced.

以上説明した透明アクリル板15による輝度均一化の効果について、図４のグラフを参照して具体的に説明する。同図の曲線ａは、上記構成を有する面状光源10の蛍光ランプ並び方向に亘る輝度分布特性を測定した結果を示している。また同図の曲線ｂは、上記構成の面状光源10から透明アクリル板15を除いた構成、曲線ｃは上記構成の面状光源10から透明アクリル板15および透過制御部材14を除いた構成における同特性をそれぞれ測定した結果を示すものである。   The effect of uniforming the luminance by the transparent acrylic plate 15 described above will be specifically described with reference to the graph of FIG. A curve a in the figure shows the result of measuring the luminance distribution characteristic over the fluorescent lamp arrangement direction of the planar light source 10 having the above-described configuration. Further, a curve b in the figure is a configuration in which the transparent acrylic plate 15 is removed from the planar light source 10 having the above configuration, and a curve c is a configuration in which the transparent acrylic plate 15 and the transmission control member 14 are excluded from the planar light source 10 having the above configuration. The results of measuring the same characteristics are shown.

なおこの測定に使用した面状光源10において、蛍光ランプ13の直径は８ｍｍ、発光部の長さは９００ｍｍ、それらの配置ピッチは１５０ｍｍである。また前述した５通りの大きさの小孔14ａを有する透過制御部材14の長さは約８６０ｍｍ、幅は約４０ｍｍである。そして透明アクリル板15の張出し部15ａの長さは約８６０ｍｍ、幅は約５５ｍｍ、厚さは１ｍｍ、該張出し部15ａと拡散板16とのなす角度は１２°である。   In the planar light source 10 used for this measurement, the diameter of the fluorescent lamp 13 is 8 mm, the length of the light emitting portions is 900 mm, and the arrangement pitch thereof is 150 mm. The length of the transmission control member 14 having the five small holes 14a described above is about 860 mm and the width is about 40 mm. The length of the overhang 15a of the transparent acrylic plate 15 is about 860 mm, the width is about 55 mm, the thickness is 1 mm, and the angle between the overhang 15a and the diffusion plate 16 is 12 °.

輝度の測定は、透明カバー板17から３ｍ離れた位置において、図４の横軸に示す「１」〜「７」の箇所において行った。測定箇所「１」、「３」「５」および「７」は、４本の蛍光ランプ13にそれぞれ正対する箇所、測定箇所「２」、「４」および「６」は上記測定箇所「１」、「３」「５」および「７」の中間位置である。したがって、これらの測定箇所の相互の間隔は７５ｍｍである。なお、測定は各箇所において３回ずつ行い、それらの平均値を測定値として採用し、各々７つの測定値を補間して図４のグラフを作成した。   The luminance was measured at locations “1” to “7” shown on the horizontal axis in FIG. 4 at a position 3 m away from the transparent cover plate 17. The measurement locations “1”, “3”, “5” and “7” are locations facing the four fluorescent lamps 13 respectively, and the measurement locations “2”, “4” and “6” are the measurement locations “1”. , “3”, “5” and “7”. Therefore, the distance between these measurement points is 75 mm. The measurement was performed three times at each location, and the average value was adopted as the measurement value, and the graph of FIG. 4 was created by interpolating each of the seven measurement values.

この図４に示される通り、透明アクリル板15および透過制御部材14を備えない面状光源（曲線ｃ）と比べて、透過制御部材14を設けた面状光源（曲線ｂ）は輝度均一化効果がより高いものとなっているが、透過制御部材14に加えて透明アクリル板15も設けた本発明による面状光源10（曲線ａ）は、同効果がさらに高いものとなっている。なお、図４中の曲線ａ、ｂ、ｃの基になったそれぞれ７つの測定値（上記平均値）の標準偏差は、各々５０．３６、９２．０４、３７２．４０である。   As shown in FIG. 4, the planar light source (curve b) provided with the transmission control member 14 is more uniform in luminance than the planar light source (curve c) not provided with the transparent acrylic plate 15 and the transmission control member 14. However, the planar light source 10 (curve a) according to the present invention in which the transparent acrylic plate 15 is provided in addition to the transmission control member 14 has a higher effect. The standard deviations of the seven measured values (the above average values) based on the curves a, b, and c in FIG. 4 are 50.36, 92.04, and 372.40, respectively.

以上、棒状光源として直管状の蛍光ランプ13が用いられた実施形態について説明したが、本発明において用いられる棒状光源はそれに限られるものではなく、従来公知のその他の棒状光源、例えば発光ダイオードアレイ等や、さらには湾曲した形状の棒状光源も適用可能であり、そのようにした場合も、先に説明した本発明の効果を同様に奏するものである。   As described above, the embodiment in which the straight tubular fluorescent lamp 13 is used as the rod-shaped light source has been described. However, the rod-shaped light source used in the present invention is not limited thereto, and other conventionally known rod-shaped light sources such as a light emitting diode array, etc. In addition, a curved rod-shaped light source can also be applied, and even in such a case, the effects of the present invention described above are similarly achieved.

また以上説明した実施形態においては、複数の棒状光源、拡散板をそれぞれ概略的にＢ、Ｓとし、また棒状光源の並び方向を矢印Ａで表すと、図５に示す通りの光源配置パターンを有するものであるが、本発明においてはその他の光源配置パターンを適用することも可能である。以下、そのような光源配置パターンの例について説明する。   Further, in the embodiment described above, a plurality of rod-shaped light sources and diffuser plates are schematically denoted by B and S, respectively, and the arrangement direction of the rod-shaped light sources is represented by an arrow A, and has a light source arrangement pattern as shown in FIG. However, other light source arrangement patterns can be applied in the present invention. Hereinafter, an example of such a light source arrangement pattern will be described.

図６に示すパターンは、複数の同じ長さの棒状光源Ｂが、それぞれの長軸と直交する方向に並び、かつ該長軸の方向に違いにずれた状態に配置されたものである。この場合は拡散板Ｂとして図示のような形状のものが用いられ、平行四辺形状の面状光源が構成されることになる。   In the pattern shown in FIG. 6, a plurality of rod-like light sources B having the same length are arranged in a direction perpendicular to each major axis and are shifted in a different direction in the major axis direction. In this case, a diffuser plate B having a shape as illustrated is used, and a parallelogram-shaped planar light source is configured.

図７に示すパターンは、長さが互いに異なる複数の棒状光源Ｂが、それぞれの長軸と直交する方向に、長さ順に並べられたものである。この場合は拡散板Ｓとして図示のような形状のものが用いられ、三角形状の面状光源が構成されることになる。   In the pattern shown in FIG. 7, a plurality of rod-like light sources B having different lengths are arranged in the order of length in a direction perpendicular to the major axis. In this case, the diffusion plate S having a shape as shown in the figure is used, and a triangular planar light source is configured.

図８に示すパターンは、複数の同じ長さの棒状光源Ｂが放射状に並べられたものである。つまりこの場合の棒状光源の並び方向Ａは、円弧に沿ったものとなる。そしてこの場合は拡散板Ｓとして図示のような形状のものが用いられ、半円形状の面状光源が構成されることになる。   The pattern shown in FIG. 8 is a pattern in which a plurality of rod-like light sources B having the same length are arranged radially. That is, the arrangement direction A of the rod-shaped light sources in this case is along the arc. In this case, the diffusing plate S having a shape as shown in the figure is used to form a semicircular planar light source.

本発明の一実施形態による面状光源の一部破断斜視図The partially broken perspective view of the planar light source by one Embodiment of this invention 図１の面状光源の一部破断立面図1 is a partially broken elevation view of the planar light source of FIG. 図１の面状光源を構成する透過制御部材の平面図The top view of the transmission control member which comprises the planar light source of FIG. 図１の面状光源と従来の面状光源の輝度分布特性を比較して示すグラフA graph showing a comparison of luminance distribution characteristics of the planar light source of FIG. 1 and a conventional planar light source 本発明の面状光源における光源配置パターン例を示す概略図Schematic which shows the example of the light source arrangement pattern in the planar light source of this invention 本発明の面状光源における光源配置パターンの別の例を示す概略図Schematic which shows another example of the light source arrangement pattern in the planar light source of this invention 本発明の面状光源における光源配置パターンのさらに別の例を示す概略図Schematic which shows another example of the light source arrangement pattern in the planar light source of this invention 本発明の面状光源における光源配置パターンのさらに別の例を示す概略図Schematic which shows another example of the light source arrangement pattern in the planar light source of this invention

符号の説明Explanation of symbols

10 面状光源
11 ケース
13 直管状蛍光ランプ
14 透過制御部材
15 透明アクリル板
15ａ 透明アクリル板の張出し部
16 拡散板
17 透明カバー板
18 反射部材 10 Planar light source
11 cases
13 Straight tube fluorescent lamp
14 Transmission control member
15 Clear acrylic board
15a Overhang of transparent acrylic plate
16 Diffuser
17 Transparent cover plate
18 Reflective member

Claims (6)

略一定の平面内において、それぞれの長軸と交わる方向に並べて配置された複数の棒状光源と、
該光源の１つ毎に、その前方側において光源に沿って延びる状態に配置された、光源から遠い部分ほどより高透過率とされた透過制御部材と、
１つの透過制御部材の光源に沿って延びる一側端近傍に一端が位置し、他端が前記一端と比べてより前記平面に近い位置に有る状態にして、該平面に対して傾けて配置された板状の透光性部材と、
この透光性部材および前記透過制御部材の前方側に配置された拡散板と、
前記複数の棒状光源の後方側に配された反射部材とからなる面状光源。 A plurality of rod-like light sources arranged side by side in a direction intersecting with each major axis in a substantially constant plane;
For each of the light sources, a transmission control member that is disposed in a state extending along the light source on the front side thereof, and has a higher transmittance at a portion farther from the light source,
One transmission control member is disposed at one end near one end extending along the light source, and the other end is positioned closer to the plane than the one end, and is inclined with respect to the plane. A plate-like translucent member;
A diffusing plate disposed on the front side of the translucent member and the transmission control member;
A planar light source comprising a reflecting member disposed on the rear side of the plurality of rod-shaped light sources. 前記透光性部材がアクリル板からなることを特徴とする請求項１記載の面状光源。   The planar light source according to claim 1, wherein the translucent member is made of an acrylic plate. 前記透過制御部材が、光源からの光を反射する反射部材に多数の孔が形成され、それらの孔の開口率を調整することによって透過率が調整されたものであることを特徴とする請求項１または２記載の面状光源。   2. The transmission control member according to claim 1, wherein a plurality of holes are formed in a reflection member that reflects light from a light source, and the transmittance is adjusted by adjusting an aperture ratio of the holes. 3. A planar light source according to 1 or 2. 前記複数の棒状光源が、それぞれの長軸と直交する方向に並べて配置されていることを特徴とする請求項１から３いずれか１項記載の面状光源。   The planar light source according to any one of claims 1 to 3, wherein the plurality of rod-shaped light sources are arranged side by side in a direction orthogonal to each major axis. 前記複数の棒状光源が、蛍光ランプからなることを特徴とする請求項１から４いずれか１項記載の面状光源。   The planar light source according to any one of claims 1 to 4, wherein the plurality of rod-shaped light sources are fluorescent lamps. 前記透過制御部材が、前記透光性部材と同一の部材に透過制御機能を直接付与することにより形成されたものであることを特徴とする請求項１から５いずれか１項記載の面状光源。   6. The planar light source according to claim 1, wherein the transmission control member is formed by directly imparting a transmission control function to the same member as the translucent member. .
JP2006096598A 2006-03-31 2006-03-31 Planar light source Withdrawn JP2007273222A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008136307A1 (en) * 2007-04-27 2008-11-13 Harison Toshiba Lighting Corporation Direct-lighting backlight
JP2010197865A (en) * 2009-02-26 2010-09-09 Victor Co Of Japan Ltd Lighting curtain, backlight device, and liquid crystal display device
CN109027818A (en) * 2018-09-20 2018-12-18 杭州德克司达照明电器有限公司 A kind of LED diffusing reflection illuminates compound lamp bar and lamps and lanterns

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008136307A1 (en) * 2007-04-27 2008-11-13 Harison Toshiba Lighting Corporation Direct-lighting backlight
JP2010197865A (en) * 2009-02-26 2010-09-09 Victor Co Of Japan Ltd Lighting curtain, backlight device, and liquid crystal display device
CN109027818A (en) * 2018-09-20 2018-12-18 杭州德克司达照明电器有限公司 A kind of LED diffusing reflection illuminates compound lamp bar and lamps and lanterns

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