JPH0667027A - Surface illuminator - Google Patents
Surface illuminatorInfo
- Publication number
- JPH0667027A JPH0667027A JP4222998A JP22299892A JPH0667027A JP H0667027 A JPH0667027 A JP H0667027A JP 4222998 A JP4222998 A JP 4222998A JP 22299892 A JP22299892 A JP 22299892A JP H0667027 A JPH0667027 A JP H0667027A
- Authority
- JP
- Japan
- Prior art keywords
- light
- control plate
- light control
- plate
- lighting device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、面上均一に照明を行う
面照明装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface lighting device which illuminates a surface uniformly.
【０００２】近年、例えば液晶表示装置のカラー化及び
ノート型ＯＡ機器の小型化などに伴い、搭載される面照
明装置の高輝度化、薄型化、軽量化が望まれている。そ
のため、輝度ムラを低減して高輝度化を図りつつ薄型軽
量化を図る必要がある。In recent years, for example, with the colorization of liquid crystal display devices and the downsizing of notebook type OA equipment, there has been a demand for higher brightness, thinner and lighter surface mounted illumination devices. Therefore, it is necessary to reduce the unevenness in brightness to achieve high brightness and to achieve thinning and weight reduction.
【０００３】[0003]
【従来の技術】図７及び図８に、従来の面照明装置を説
明するための図を示す。2. Description of the Related Art FIGS. 7 and 8 are views for explaining a conventional surface lighting device.
【０００４】図７（Ａ）に示す面照明装置１１A は、い
わゆる直下型と称されるもので、箱型の反射鏡１２内
に、例えば２本の蛍光管１３ａ，１３ｂが配置され、該
反射鏡１２の開口部上に樹脂製シートのライティングカ
ーテン１４が設けられる。さらに、ライティングカーテ
ン１４上に拡散板１５が設けられる。The surface illuminator 11 A shown in FIG. 7A is of a so-called direct type, in which, for example, two fluorescent tubes 13 a and 13 b are arranged in a box-shaped reflecting mirror 12. A lighting curtain 14 made of a resin sheet is provided on the opening of the reflecting mirror 12. Further, a diffusion plate 15 is provided on the lighting curtain 14.
【０００５】ライティングカーテン１４は、図７（Ｂ）
に示すように、ＰＥＴ（ポリエチレンテレフタレート）
樹脂製フィルム１４ａ上にアルミ反射点１４ｂを所定パ
ターン（蛍光管１３ａ，１３ｂの直上で密に配置）で網
点状に形成したものである。The lighting curtain 14 is shown in FIG.
As shown in, PET (polyethylene terephthalate)
Aluminum reflection points 14b are formed in a dot pattern on a resin film 14a in a predetermined pattern (densely arranged immediately above the fluorescent tubes 13a and 13b).
【０００６】すなわち、図７（Ｃ）に示すように、面照
明装置１１A では蛍光管１３ａ，１３ｂの直上が最も高
輝度となることから、この部分で高密度でアルミ反射点
１４ｂを配置して反射量を多くする。また、他の部分で
は光の到達点が遠くなって低輝度となることから、低密
度でアルミ反射点１４ｂを少なくして透過量を多くする
ことにより、光面上（拡散板１５）で均一輝度になるよ
うに図っている。That is, as shown in FIG. 7C, in the surface lighting device 11 A , the highest brightness is immediately above the fluorescent tubes 13a and 13b. Therefore, the aluminum reflection points 14b are arranged at a high density in this part. Increase the amount of reflection. In addition, since the arrival point of the light becomes far in other parts and the brightness becomes low, by reducing the aluminum reflection points 14b at a low density and increasing the transmission amount, the light is made uniform on the light surface (diffusion plate 15). It is designed to have brightness.
【０００７】一方、図８（Ａ）に示す面照明装置１１B
は、いわゆるエッジライト型と称されるもので、側部両
端に光源（蛍光管）１６ａ，１６ｂが配置された導光板
１７の一方面上に拡散板１８が設けられ、他方面上に反
射板１９が設けられる。そして、蛍光管１６ａ，１６ｂ
の外周にリフレクタ２０ａ，２０ｂが設けられたもので
ある。On the other hand, the surface lighting device 11 B shown in FIG.
Is a so-called edge light type, in which a light diffusing plate 18 is provided on one surface of the light guide plate 17 in which light sources (fluorescent tubes) 16a and 16b are arranged at both ends of a side, and a reflecting plate is provided on the other surface. 19 is provided. And the fluorescent tubes 16a, 16b
The reflectors 20a and 20b are provided on the outer periphery of the.
【０００８】導光板１７の反射板１９に対向する面に
は、図８（Ｂ）に示すように、拡散反射特性を有する印
刷点１９ａが所定パターンで網点状に形成された印刷膜
が形成されている。所定パターンの印刷点１９ａは、導
光板１７内部を伝播する光を外部へ出射させる機能を果
たすものであり、蛍光管１６ａ，１６ｂより離れる程単
位面積における印刷点１９ａの面積が増大するように形
成される。On the surface of the light guide plate 17 facing the reflection plate 19, as shown in FIG. 8B, a print film is formed in which print dots 19a having a diffuse reflection characteristic are formed in a dot pattern in a predetermined pattern. Has been done. The printed points 19a having a predetermined pattern have a function of emitting the light propagating inside the light guide plate 17 to the outside, and are formed such that the area of the printed points 19a in a unit area increases as the distance from the fluorescent tubes 16a and 16b increases. To be done.
【０００９】このような面照明装置１１B は、蛍光管１
６ａ，１６ｂからの光が、リフレクタ２０ａ，２０ｂに
よって、導光板１７の側面に略集光されて入射し、導光
板１７内を全反射によって伝播する。このとき、導光板
１７の他方面で印刷点１９ａに当たる光が拡散反射され
て導光板１７の外部に出射する。The surface illuminator 11 B of this type has the fluorescent tube 1
The lights from 6a and 16b are substantially condensed and incident on the side surface of the light guide plate 17 by the reflectors 20a and 20b, and propagate in the light guide plate 17 by total reflection. At this time, the light striking the printing point 19 a is diffused and reflected on the other surface of the light guide plate 17 and is emitted to the outside of the light guide plate 17.
【００１０】すなわち、導光板１７の印刷面における単
位面積当たりの印刷点１９ａの面積を、蛍光管１６ａ，
１６ｂからの距離に応じて適宜設定することにより、拡
散板１８の出射面上で輝度を均一にすることができるも
のである。That is, the area of the printing point 19a per unit area on the printing surface of the light guide plate 17 is defined by the fluorescent tubes 16a,
The brightness can be made uniform on the emission surface of the diffusion plate 18 by appropriately setting it according to the distance from 16b.
【００１１】[0011]
【発明が解決しようとする課題】しかし、図７に示す面
照明装置１１A は、ライティングカーテン１４の位置に
対して光量制御を厳密に決定しなければならず、光源等
の使用部材の位置ずれが発生すると、所定位置の光量が
変化して発光面上に大きな輝度むらを生じさせることと
なる。また、ライティングカーテン１４は拡散板１５に
略密着されるもので、反射点１４ａが発光面側より認識
できないように、拡散板１５を拡散特性の高いもの、す
なわち厚く光透過性が低いものを使用しなければなら
ず、高輝度化、薄型化が図れないという問題がある。However, in the surface lighting device 11 A shown in FIG. 7, it is necessary to strictly determine the light amount control with respect to the position of the lighting curtain 14, and the positional deviation of the used members such as the light source. When occurs, the amount of light at a predetermined position changes, which causes a large unevenness in brightness on the light emitting surface. Further, the lighting curtain 14 is substantially adhered to the diffuser plate 15, and the diffuser plate 15 having a high diffusing property, that is, thick and having low light transmittance is used so that the reflection point 14a cannot be recognized from the light emitting surface side. Therefore, there is a problem that high brightness and thinness cannot be achieved.
【００１２】一方、図８に示す面照明装置１１B は、光
源１６ａ，１６ｂを一方向に集光し、導光板１７を介し
て出射することから、輝度低下を生じると共に、装置の
ほとんどが導光板１７で占められることとなり、軽量化
を図ることが困難であるという問題がある。On the other hand, the surface illumination device 11 B shown in FIG. 8 condenses the light sources 16 a and 16 b in one direction and emits the light through the light guide plate 17, so that the brightness is lowered and most of the devices are guided. Since it is occupied by the optical plate 17, it is difficult to reduce the weight.
【００１３】そこで、本発明は上記課題に鑑みなされた
もので、輝度ムラを低減し、薄型軽量化を図る面照明装
置を提供することを目的とする。Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a surface illuminating device which reduces luminance unevenness and is thin and lightweight.
【００１４】[0014]
【課題を解決するための手段】上記課題は、光源からの
光を、調光板における透過反射パターンにより透過光量
を制御して拡散板に入射させ、該拡散板面全体より出射
させる面照明装置において、前記調光板の透過反射パタ
ーンを、密度を異ならせて格子状に形成し、適宜前記調
光板の前記格子状の透過反射パターンを、表面反射の断
面円形状の線材を織物構造にして形成することにより解
決される。SUMMARY OF THE INVENTION The above object is to provide a surface illuminating device which allows light from a light source to be incident on a diffuser plate by controlling the amount of transmitted light by a transmissive reflection pattern on a light control plate and to be emitted from the entire surface of the diffuser plate. In the above, the transmission / reflection pattern of the light control plate is formed in a grid shape with different densities, and the grid-shaped transmission / reflection pattern of the light control plate is appropriately formed into a woven structure of a wire rod having a circular cross section for surface reflection. It is solved by forming.
【００１５】また、上記の調光板を、前記光源からの光
路に対して所定角度で複数段設け、各段の反射光を前記
拡散板に入射させることによっても解決される。It is also possible to solve the problems by providing the above-mentioned light control plate in a plurality of stages at a predetermined angle with respect to the optical path from the light source and letting the reflected light of each stage enter the diffusion plate.
【００１６】[0016]
【作用】上述のように、調光板の透過反射パターンを、
密度を異ならせて格子状に形成する。この場合、格子状
の透過反射パターンを、表面反射の断面円形状の線材を
織物構造にして形成する。As described above, the transmission / reflection pattern of the light control plate is changed to
It is formed in a lattice shape with different densities. In this case, the grid-like transmission / reflection pattern is formed by using a wire material having a surface-reflection circular cross section as a woven structure.
【００１７】これにより、光源からの光が、調光板の格
子密度の異ならせた透過反射パターンによって透過光量
が制御される。この場合、該パターンを表面反射の断面
円形状の線材を織物構造にして形成すると、その形状に
より、パターンに当たる光は総て反射されるものでなく
一部のみが反射し、他は拡散して拡散板に入射されるこ
とになる。Thus, the amount of transmitted light of the light from the light source is controlled by the transmissive / reflecting pattern having different grating densities of the light control plate. In this case, when the pattern is formed by forming a wire material having a surface-reflective circular cross section into a woven structure, the light impinging on the pattern is not totally reflected but only a part is reflected and the other is diffused due to the shape. It will be incident on the diffusion plate.
【００１８】従って、高輝度を維持しつつ光源等の取り
付け精度が要求されずに輝度ムラを解消することが可能
となる。Therefore, it is possible to eliminate uneven brightness while maintaining high brightness without requiring accuracy in mounting a light source or the like.
【００１９】また、光源からの光路に調光板を所定角度
で複数段設け、各段の反射光を拡散板に入射させる。す
なわち、調光板が導光板の役割をも果たしており、薄型
軽量化を図ることが可能となる。Further, a plurality of light control plates are provided at a predetermined angle in the optical path from the light source, and the reflected light of each stage is made incident on the diffusion plate. That is, the light control plate also plays the role of a light guide plate, and it is possible to achieve thinning and weight reduction.
【００２０】[0020]
【実施例】図１に、本発明の第１実施例の構成図を示
す。図１において、面照明装置２１は、箱型の反射鏡２
２内に光源として２本の蛍光管２３ａ，２３ｂが配置さ
れ、該反射鏡２２の開口部分に調光板２４が設けられ
る。そして、調光板２４上に拡散板２５が位置される。FIG. 1 is a block diagram of the first embodiment of the present invention. In FIG. 1, the surface lighting device 21 includes a box-shaped reflecting mirror 2
Two fluorescent tubes 23 a and 23 b are arranged as light sources in the light source 2, and a light control plate 24 is provided at the opening of the reflecting mirror 22. Then, the diffusion plate 25 is positioned on the light control plate 24.
【００２１】例えば、反射鏡２２は、内壁に白色塗装が
施されたアルミニウム材（厚さ0.5mm）で箱型に形成さ
れたものであり、蛍光管２３ａ，２３ｂは直径８mmの冷
陰極蛍光管が使用される。For example, the reflecting mirror 22 is a box-shaped one made of an aluminum material (thickness: 0.5 mm) with white coating on the inner wall, and the fluorescent tubes 23a and 23b are cold cathode fluorescent tubes having a diameter of 8 mm. Is used.
【００２２】ここで、図２に、図１の調光板を説明する
ための図を示す。図２（Ａ），（Ｂ）において、調光板
２４は、直径0.5 mmの金属繊維の表面にアルミめっきを
施した線材２４ａを織物構造にして格子状に形成したも
のである。そして、例えばアクリル樹脂等によりコーテ
ィングして、撓み等の変形を防止している。この格子状
の線材２４ａが調光板２４の透過反射パターンとなる。Here, FIG. 2 shows a diagram for explaining the light control plate of FIG. 2 (A) and 2 (B), the light control plate 24 is formed by forming a wire material 24a, which has a diameter of 0.5 mm and is plated with aluminium, on the surface of the metal fiber into a woven structure in a lattice shape. Then, for example, it is coated with acrylic resin or the like to prevent deformation such as bending. This grid-shaped wire 24 a becomes a transmission / reflection pattern of the light control plate 24.
【００２３】また、調光板２４の透過反射パターンとし
て、蛍光管２３ａ，２３ｂの直上の近い部分で透過光量
を小とする密度、即ち密部分２６ａを形成すると共に、
遠い部分で透過光量を大とする密度、即ち疎部分２６ｂ
を形成している。すなわち、蛍光管２３ａ，２３ｂとの
距離関係で透過反射パターンの疎密状態を適宜設定する
ものである。Further, as a transmission / reflection pattern of the light control plate 24, a density for reducing the amount of transmitted light, that is, a dense portion 26a is formed at a portion immediately above the fluorescent tubes 23a and 23b, and
Density at which the amount of transmitted light is large at a distant portion, that is, a sparse portion 26b
Is formed. That is, the sparse / dense state of the transmission / reflection pattern is appropriately set according to the distance relationship with the fluorescent tubes 23a and 23b.
【００２４】そこで、図３に、図２の調光原理を説明す
るための図を示し、図１と共に説明する。Therefore, FIG. 3 shows a diagram for explaining the dimming principle of FIG. 2, which will be described together with FIG.
【００２５】上述の面照明装置２１は、例えば蛍光管２
３ｂからの光は、一部が直接に調光板２４に到達し、他
の光が反射鏡２２及び他の蛍光管２３ａに到達する。調
光板２４へ直接到達する光は、その距離に応じて輝度に
変化を生じ蛍光管２３ｂに近くなるほど高輝度となり、
反射鏡２２及びもう一方の蛍光管２３ｂに到達する光は
反射及び拡散を起こすと共に、調光板２４への到達距離
が大きくなって蛍光管２３ｂから離れるに従い低輝度と
なる。The above-mentioned surface lighting device 21 is, for example, the fluorescent tube 2
A part of the light from 3b directly reaches the light control plate 24, and the other light reaches the reflecting mirror 22 and the other fluorescent tube 23a. The light that directly reaches the light control plate 24 changes in brightness according to the distance, and becomes brighter as it gets closer to the fluorescent tube 23b,
The light reaching the reflecting mirror 22 and the other fluorescent tube 23b is reflected and diffused, and the reaching distance to the light control plate 24 becomes large and the brightness becomes low as the distance from the fluorescent tube 23b increases.
【００２６】このとき、図３に示すように、調光板２４
の透過反射パターンを形成する線材２４ａに当たる光は
一部は反射されて反射鏡２２内に反射し、一部は光路を
変えて拡散し、拡散板２５に入射する。At this time, as shown in FIG.
Part of the light striking the wire 24a forming the transmissive reflection pattern is reflected inside the reflecting mirror 22, and part of the light is diffused by changing the optical path and is incident on the diffusion plate 25.
【００２７】このように、調光板２４への到達光は蛍光
管２３ｂに近いほど高輝度となり、離れるほど低輝度と
なる。すなわち、調光板２４の蛍光管２３ｂに近いほど
密、即ち透過光量が小で反射光量が大となり、蛍光管２
３ｂから離れるに従い疎、即ち透過光量が大で反射光量
が小となることから、調光板２４を通過し拡散板２５か
ら出射する光は発光面上均一となる。As described above, the light reaching the light control plate 24 has higher brightness as it is closer to the fluorescent tube 23b and lower brightness as it is farther away. That is, the closer it is to the fluorescent tube 23b of the light control plate 24, the denser it is, that is, the transmitted light amount is small and the reflected light amount is large.
Since the amount of transmitted light is large and the amount of reflected light is small as the distance from 3b increases, the light passing through the light control plate 24 and emitted from the diffusion plate 25 is uniform on the light emitting surface.
【００２８】これにより、拡散板２５の薄型化が可能と
なり、これに伴って面照明装置２１の薄型化が図れると
共に、拡散板の透過率が向上し、高輝度化を実現するこ
とができる。As a result, the diffusion plate 25 can be made thinner, and accordingly, the surface lighting device 21 can be made thinner, and the transmittance of the diffusion plate is improved, so that higher brightness can be realized.
【００２９】ここで、図４に、図２の他の構造を説明す
るための図を示す。図４は、調光板２４の透過反射パタ
ーンを構成する線材２４ｂを、ＰＥＴ系樹脂繊維３３の
表面にアルミ薄膜３２を被覆した後、ＰＥＴ系樹脂被覆
３１にて再被覆したものである。Here, FIG. 4 shows a diagram for explaining another structure of FIG. In FIG. 4, the wire 24b forming the transmission / reflection pattern of the light control plate 24 is obtained by coating the surface of the PET resin fiber 33 with the aluminum thin film 32 and then recoating it with the PET resin coating 31.
【００３０】次に、図５に、第１実施例の一適用例の構
成図を示す。図５は、上述の面照明装置２１を搭載した
液晶表示装置４１を示したもので、面照明装置２１の拡
散板２５上に液晶パネル４２を設け、これらを支持枠４
３で固定したものである。Next, FIG. 5 shows a block diagram of an application example of the first embodiment. FIG. 5 shows a liquid crystal display device 41 in which the above-mentioned surface lighting device 21 is mounted. A liquid crystal panel 42 is provided on the diffusion plate 25 of the surface lighting device 21, and these are supported by the support frame 4.
It was fixed at 3.
【００３１】そして、液晶パネル４２は、コンピュータ
等の制御部４５により駆動されると共に、面照明装置２
１の調光板２４の線材２４ａが制御部４５の零基準電位
部分に接続される。この線材２４ａを零基準電位にする
ことにより、面照明装置２１及び液晶表示装置４１から
発生する電磁波や高周波電流等をシールドするものであ
る。The liquid crystal panel 42 is driven by the control unit 45 such as a computer and the surface lighting device 2
The wire rod 24 a of the first light control plate 24 is connected to the zero reference potential portion of the control unit 45. By setting the wire 24a to the zero reference potential, electromagnetic waves and high frequency currents generated from the surface lighting device 21 and the liquid crystal display device 41 are shielded.
【００３２】次に、図６に、本発明の第２実施例の構成
図を示す。図６（Ａ）における面照明装置５１は、エッ
ジライト型のものであり、反射板５２と拡散板５３とで
形成される長方空間の対向する側部に光源としての蛍光
管２３ａ，２３ｂが配置され、蛍光管２３ａ，２３ｂの
外周にリフレクタ５４ａ，５４ｂが設けられる。Next, FIG. 6 shows a block diagram of a second embodiment of the present invention. The surface lighting device 51 in FIG. 6A is of an edge light type, and fluorescent tubes 23a and 23b as light sources are provided on opposite sides of a rectangular space formed by the reflection plate 52 and the diffusion plate 53. The reflectors 54a and 54b are provided on the outer circumferences of the fluorescent tubes 23a and 23b.
【００３３】そして、反射板５２と拡散板５３間の空間
内で、調光板５５が反射光が拡散板５３に向かう方向で
あって、略４５°の角度で複数段設けられる。In the space between the reflecting plate 52 and the diffusing plate 53, a plurality of dimming plates 55 are provided at an angle of about 45 ° in the direction of the reflected light toward the diffusing plate 53.
【００３４】調光板５５は、図２に示すように透過反射
パターンを線材で織物構造で格子状に形成したものでも
よく、また、図６（Ｂ）に示すように、例えば厚さ１mm
の透明アクリル板５５ａの表面に反射膜５５ｂとしてア
ルミニウムを格子状に蒸着し、さらにＰＥＴ系樹脂５５
ｃによってコーティングして多層構造としたものでもよ
い。As shown in FIG. 2, the light control plate 55 may have a transmission / reflection pattern formed of a wire material in a woven structure in a lattice pattern, and as shown in FIG. 6 (B), for example, has a thickness of 1 mm.
Aluminum is vapor-deposited in a grid pattern on the surface of the transparent acrylic plate 55a as a reflective film 55b.
It may be coated with c to form a multilayer structure.
【００３５】また、各段の調光板５５は、蛍光管２３
ａ，２３ｂから離れるほど格子パターン間を小さくして
密に形成される。これにより反射光量の増大を図ってい
る。Further, the light control plate 55 at each stage is used for the fluorescent tube 23.
As the distance from a and 23b increases, the distance between the lattice patterns becomes smaller and the lattice patterns are densely formed. Thereby, the amount of reflected light is increased.
【００３６】尚、本実施例においては、一つの調光板５
５内において位置による反射光量の調節は必須とされな
いが、リフレクタ５４ａ，５４ｂの構成による光源部出
射光の状態によって適宜調整することもできる。In this embodiment, one light control plate 5 is used.
Although it is not essential to adjust the amount of reflected light depending on the position within 5, it may be appropriately adjusted depending on the state of the light emitted from the light source unit by the configuration of the reflectors 54a and 54b.
【００３７】このような面照明装置５１は、各調光板５
５に到達する光は調光板５５の発光面に向かって反射す
るものの一部の光が透過し、次段の調光板５５に到達し
て、順次反射と透過を繰り返す。The surface lighting device 51 as described above is provided with the respective light control plates 5.
Although the light reaching 5 is reflected toward the light emitting surface of the light control plate 55, a part of the light is transmitted and reaches the light control plate 55 at the next stage, and is repeatedly reflected and transmitted.
【００３８】これにより、調光板５５は蛍光管２３ａ，
２３ｂからの距離に応じて反射光量を調節しているため
発光面への出射光は発光面全体で均一となる。As a result, the light control plate 55 causes the fluorescent tubes 23a,
Since the amount of reflected light is adjusted according to the distance from 23b, the light emitted to the light emitting surface is uniform over the entire light emitting surface.
【００３９】更に、調光板５５の発光面上には拡散板５
３を配置しているため輝度の均一化はいっそう向上する
と共に調光板５５を隠蔽することとなる。Furthermore, the diffusion plate 5 is provided on the light emitting surface of the light control plate 55.
Since 3 is arranged, the uniformity of luminance is further improved and the light control plate 55 is hidden.
【００４０】これにより、従来樹脂板が占有していた空
間を数枚の調光板５５に置き換えることが可能となるこ
とから、大幅な軽量化を図ることができるものである。As a result, the space occupied by the conventional resin plate can be replaced with a few light control plates 55, so that the weight can be greatly reduced.
【００４１】[0041]
【発明の効果】以上のように本発明によれば、調光板の
透過反射パターンを密度の異なる格子状に形成し、又は
調光板を光源からの光路に対して所定角度で複数段設け
ることにより、輝度ムラを低減すると共に、薄型軽量化
を図ることができる。As described above, according to the present invention, the transmission / reflection patterns of the light control plate are formed in a grid shape having different densities, or the light control plates are provided in a plurality of stages at a predetermined angle with respect to the optical path from the light source. As a result, it is possible to reduce luminance unevenness and to reduce the thickness and weight.
【図１】本発明の第１実施例の構成図である。FIG. 1 is a configuration diagram of a first embodiment of the present invention.
【図２】図１の調光板を説明するための図である。FIG. 2 is a diagram for explaining the light control plate of FIG.
【図３】図２の調光原理を説明するための図である。FIG. 3 is a diagram for explaining the light control principle of FIG.
【図４】図２の他の構造を説明するための図である。FIG. 4 is a diagram for explaining another structure of FIG.
【図５】第１実施例の一適用例の構成図である。FIG. 5 is a configuration diagram of an application example of the first embodiment.
【図６】本発明の第２実施例の構成図である。FIG. 6 is a configuration diagram of a second embodiment of the present invention.
【図７】従来の面照明装置を説明するための図である。FIG. 7 is a diagram for explaining a conventional surface lighting device.
【図８】従来の面照明装置を説明するための図である。FIG. 8 is a diagram for explaining a conventional surface lighting device.
２１，５１ 面照明装置 ２２ 反射鏡 ２３ａ，２３ｂ 蛍光管 ２４，５５ 調光板 ２５，５３ 拡散板 ２６ａ 密部分 ２６ｂ 疎部分 ４１ 液晶表示装置 ４２ 液晶パネル ４３ 支持枠 ４５ 制御部 ５２ 反射板 21, 51 Surface lighting device 22 Reflector 23a, 23b Fluorescent tube 24, 55 Light control plate 25, 53 Diffuser plate 26a Dense part 26b Sparse part 41 Liquid crystal display device 42 Liquid crystal panel 43 Support frame 45 Control part 52 Reflector plate
Claims (6)
光板（２４）における透過反射パターンにより透過光量
を制御して拡散板（２５）に入射させ、該拡散板面全体
より出射させる面照明装置において、 前記調光板（２４）の透過反射パターンを、密度を異な
らせて格子状に形成することを特徴とする面照明装置。1. The light from a light source (23a, 23b) is made incident on a diffuser plate (25) by controlling the amount of transmitted light by a transmissive reflection pattern on a light control plate (24), and emitted from the entire surface of the diffuser plate. A surface lighting device, characterized in that the transmission / reflection pattern of the light control plate (24) is formed in a lattice shape with different densities.
反射パターンは、表面反射の断面円形状の線材（２４
ａ）を織物構造にして形成されることを特徴とする請求
項１記載の面照明装置。2. The grid-shaped transmission / reflection pattern of the light control plate (24) has a surface-reflecting wire rod (24) having a circular cross section.
2. The surface lighting device according to claim 1, wherein a) is formed to have a woven structure.
は、前記光源（２３ａ，２３ｂ）に近い部分で前記透過
光量を小とする密度で形成されると共に、該光源（２３
ａ，２３ｂ）に遠い部分で前記光量を大とする密度で形
成されることを特徴とする請求項１又は２記載の面照明
装置。3. The transmission / reflection pattern of the light control plate (24) is formed at a density that reduces the amount of transmitted light in a portion near the light sources (23a, 23b), and the light source (23).
3. The surface lighting device according to claim 1, wherein the surface lighting device is formed with a density that increases the light amount in a portion far from a and 23b).
ａ，２３ｂ）からの光路に対して所定角度で複数段設
け、各段の反射光を前記拡散板（５３）に入射させるこ
とを特徴とする請求項１又は２記載の面照明装置。4. The light control plate (55) is connected to the light source (23).
The surface lighting device according to claim 1 or 2, wherein a plurality of stages are provided at a predetermined angle with respect to the optical path from (a, 23b), and the reflected light of each stage is incident on the diffuser plate (53).
ａ）上に前記透過反射パターンの格子状膜（５５ｂ）が
形成されることを特徴とする請求項４記載の面照明装
置。5. The light control plate (55) is a transparent plate (55).
5. The surface lighting device according to claim 4, wherein a grid-like film (55b) of the transmissive reflection pattern is formed on a).
反射パターンの密度を異ならせることを特徴とする請求
項４又は５記載の面照明装置。6. The surface lighting device according to claim 4, wherein the density of the transmission / reflection pattern of the light control plate (55) is different in each of the stages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4222998A JPH0667027A (en) | 1992-08-21 | 1992-08-21 | Surface illuminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4222998A JPH0667027A (en) | 1992-08-21 | 1992-08-21 | Surface illuminator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0667027A true JPH0667027A (en) | 1994-03-11 |
Family
ID=16791218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4222998A Withdrawn JPH0667027A (en) | 1992-08-21 | 1992-08-21 | Surface illuminator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0667027A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009515223A (en) * | 2005-11-09 | 2009-04-09 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Display device with function to homogenize attenuation filter |
| JP2010078989A (en) * | 2008-09-26 | 2010-04-08 | Bsj-Opto Corp | Direct backlight module and diffusion plate thereof |
| CN106090842A (en) * | 2015-04-30 | 2016-11-09 | 威斯通全球技术公司 | For luminescence, it is particularly useful for producing the device of image |
| US11598997B2 (en) | 2019-10-21 | 2023-03-07 | Seiko Epson Corporation | Electro-optical device and electronic apparatus |
-
1992
- 1992-08-21 JP JP4222998A patent/JPH0667027A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009515223A (en) * | 2005-11-09 | 2009-04-09 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Display device with function to homogenize attenuation filter |
| JP2010078989A (en) * | 2008-09-26 | 2010-04-08 | Bsj-Opto Corp | Direct backlight module and diffusion plate thereof |
| CN106090842A (en) * | 2015-04-30 | 2016-11-09 | 威斯通全球技术公司 | For luminescence, it is particularly useful for producing the device of image |
| JP2016213188A (en) * | 2015-04-30 | 2016-12-15 | ビステオン グローバル テクノロジーズ インコーポレイテッド | Device for light emission, image generation in particular |
| US11598997B2 (en) | 2019-10-21 | 2023-03-07 | Seiko Epson Corporation | Electro-optical device and electronic apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19991102 |