JPH10123517A - Light transmission plate and plane illuminator - Google Patents
Light transmission plate and plane illuminatorInfo
- Publication number
- JPH10123517A JPH10123517A JP9220524A JP22052497A JPH10123517A JP H10123517 A JPH10123517 A JP H10123517A JP 9220524 A JP9220524 A JP 9220524A JP 22052497 A JP22052497 A JP 22052497A JP H10123517 A JPH10123517 A JP H10123517A
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light guide
- surface portion
- incident end
- 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.)
- Granted
Links
Landscapes
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、側端面から導入し
た光を表面から放射する導光板およびこの導光板を用い
た平面照明装置に関し、特に液晶表示面の照明に利用し
て好適なものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate for radiating light introduced from a side end face from the surface and a flat lighting device using the light guide plate, and more particularly to a light source suitable for illuminating a liquid crystal display surface. is there.
【０００２】[0002]
【従来の技術】液晶ディスプレィのいわゆるバックライ
ト光源として使用される平面照明装置は、光源ランプか
らの光を透明な導光板の側端面からこの導光板内に導
き、導光板内での光の反射を利用して導光板の表面全域
からこの光を均一に出射させるようにしたものである。
平面照明装置が使用される液晶ディスプレィの特性を考
慮した場合、この平面照明装置に要求される機能として
は、全体として薄板状であること、および光源ランプの
消費電力を極力抑えるものであることの他に、全体に亙
って均一な光を出射させることが特に重要である。2. Description of the Related Art A flat illuminating device used as a so-called backlight light source of a liquid crystal display is a device which guides light from a light source lamp into a transparent light guide plate from a side end face of the light guide plate and reflects the light in the light guide plate. This light is uniformly emitted from the entire surface of the light guide plate.
In consideration of the characteristics of the liquid crystal display in which the flat illuminator is used, the functions required of the flat illuminator include that the flat illuminator has a thin plate shape as a whole and that the power consumption of the light source lamp is minimized. In addition, it is particularly important to emit uniform light throughout.
【０００３】このような目的のため、従来の平面照明装
置は、導光板の裏面側に光反射シートを設けると共に導
光板の表面側に頂角がほぼ９０度の二等辺三角柱状のプ
リズム面を平行に配列したプリズムシートをこれらのプ
リズム面の長手方向が相互に直交するように二枚重ね合
わせた構造が採用される。つまり、導光板の裏面側から
出射した光を光反射シートによって再び導光板内に入射
させ、導光板の表面から出射した光を一対のプリズムシ
ートによって収束させ、高輝度の照明光が得られるよう
に配慮している。[0003] For this purpose, a conventional flat lighting device includes a light reflecting sheet provided on the back side of a light guide plate and an isosceles triangular prism having a vertical angle of approximately 90 degrees on the front side of the light guide plate. A structure is employed in which two prism sheets arranged in parallel are stacked such that the longitudinal directions of these prism surfaces are orthogonal to each other. That is, the light emitted from the back side of the light guide plate is made to enter the light guide plate again by the light reflection sheet, and the light emitted from the surface of the light guide plate is converged by the pair of prism sheets, so that high-luminance illumination light can be obtained. We are careful about.
【０００４】また、導光板に入射した光の均一分散を意
図して、この導光板の裏面に白色インクなどによる数百
μm 程度の大きさのドットを無数に印刷したものも知ら
れている。この場合、ドットが目障りとならないよう
に、導光板とプリズムシートとの間に光拡散板を介在さ
せ、導光板の表面から出射した光を光拡散板によって分
散させるようにしている。[0004] Further, in order to uniformly disperse the light incident on the light guide plate, there is also known a light guide plate in which dots having a size of about several hundreds of μm are printed on the rear surface of the light guide plate innumerably by white ink or the like. In this case, a light diffusing plate is interposed between the light guide plate and the prism sheet so that the dots do not become obstructive, and light emitted from the surface of the light guide plate is dispersed by the light diffusing plate.
【０００５】[0005]
【発明が解決しようとする課題】導光板の表面から出射
した光は、この導光板の構造に依存した、通常、制御不
可能な指向性を持っており、その最大輝度が得られる方
向と所望の視認方向とが一致しない場合がほとんどであ
る。このため、プリズムシートを導光板の表面に単に重
ねただけでは、導光板からの光がプリズム面の一方の斜
面側からのみ出射した状態となり、均一な分布の光強度
を得ることができない。The light emitted from the surface of the light guide plate has a directivity which is usually uncontrollable and depends on the structure of the light guide plate. In most cases, the viewing direction does not match. For this reason, if the prism sheet is simply superimposed on the surface of the light guide plate, light from the light guide plate is emitted only from one slope side of the prism surface, and a uniform distribution of light intensity cannot be obtained.
【０００６】白色インクによるドットを導光板の裏面に
印刷し、この導光板内を伝播する光を拡散させるように
したものでは、光の吸収損失が発生する欠点を有する。
しかも、これらのドットが目立たないように、光拡散板
を併用する必要があるため、この光拡散板を通過する光
のほとんどが拡散光となってしまい、輝度の低下が著し
く大きくなる結果、光量の大きな明るい光源を使用する
必要があるため、大電力を消費する。その上、光の進行
方向の制御がまったく不可能となってしまう。The method of printing dots made of white ink on the back surface of the light guide plate and diffusing the light propagating in the light guide plate has a disadvantage that light absorption loss occurs.
Moreover, it is necessary to use a light diffusing plate together so that these dots are not conspicuous, so that most of the light passing through the light diffusing plate becomes diffused light, and as a result, the decrease in luminance becomes remarkably large. Consumes a large amount of power because it is necessary to use a large bright light source. In addition, it is impossible to control the traveling direction of light at all.
【０００７】また、従来のプリズムシートは、導光板か
らの拡散光を収束させることができるものの、導光板か
ら出射する光は、導光板の表面に対して垂直ではなく、
一般的に光源から離れる方向に傾斜している成分が多
い。このため、従来のプリズムシートは、導光板の表面
から出射する光を所望の方向、すなわち導光板の表面に
対して垂直な方向に偏向させることができない。Although the conventional prism sheet can converge the diffused light from the light guide plate, the light emitted from the light guide plate is not perpendicular to the surface of the light guide plate,
Generally, there are many components inclined in a direction away from the light source. Therefore, the conventional prism sheet cannot deflect light emitted from the surface of the light guide plate in a desired direction, that is, in a direction perpendicular to the surface of the light guide plate.
【０００８】さらに、従来の平面照明装置は、光拡散板
の他に２枚のプリズムシートを導光板の上に重ね合わせ
て使用しているため、部品点数が多く、厚みを全体とし
て薄くすることができなかった。また、光拡散板や２枚
のプリズムシートでの界面反射などによる光の損失が大
きく、光量の大きな明るい光源を使用する必要があり、
装置全体のコンパクト化および低消費電力化を阻害する
要因となる。Further, the conventional flat lighting device uses two prism sheets in addition to the light diffusing plate on the light guide plate, so that the number of parts is large and the thickness is reduced as a whole. Could not. In addition, a large light loss due to a large loss of light due to the reflection of light at the interface between the light diffusion plate and the two prism sheets, etc.
This is a factor that hinders a reduction in the size and power consumption of the entire device.
【０００９】[0009]
【発明の目的】本発明の第１の目的は、損失が少なく、
しかも高輝度の光を所望の分布で出射させることが可能
な導光板を提供することにある。OBJECTS OF THE INVENTION The first object of the present invention is to reduce loss,
Moreover, it is an object of the present invention to provide a light guide plate capable of emitting high-brightness light in a desired distribution.
【００１０】また、本発明の第２の目的は、光の損失の
みならず部品点数が少なく、しかも薄くコンパクトで低
消費電力化が可能な平面照明装置を提供することにあ
る。A second object of the present invention is to provide a flat illuminating device which has a small number of components as well as light loss, and which is thin, compact and capable of reducing power consumption.
【００１１】[0011]
【課題を解決するための手段】本発明の第１の形態は、
光が出射する表面部と、この表面部の反対側に位置する
裏面部と、これら表面部および裏面部の一端側に位置し
て光源からの光を導入するための入射端面部とを有し、
この入射端面部から入射した光を前記表面部から出射さ
せるための導光板であって、前記表面部には、集光性と
方向制御性とを有し、前記裏面部にて反射した光を当該
表面部から出射させるための複数の凸部が形成されてお
り、これら凸部は、前記表面部に対して垂直に投影した
輪郭形状が三角形をなし、その一辺が前記入射端面部と
ほぼ平行に設定されると共に当該一辺がこれに対する頂
点よりも前記入射端面部側に位置していることを特徴と
する導光板にある。According to a first aspect of the present invention, there is provided:
It has a surface portion from which light is emitted, a back surface portion opposite to the front surface portion, and an incident end surface portion for introducing light from a light source located at one end side of the front surface portion and the back surface portion. ,
A light guide plate for emitting light incident from the incident end face portion from the front surface portion, wherein the front surface portion has a light collecting property and a directional control property, and reflects light reflected on the rear face portion. A plurality of convex portions for emitting light from the surface portion are formed, and these convex portions have a triangular outline shape projected perpendicularly to the surface portion, and one side thereof is substantially parallel to the incident end surface portion. And the one side is located closer to the incident end face than the apex to the light guide plate.
【００１２】本発明によると、入射端面部から導光板内
に入射した光源からの光の一部は、導光板の裏面部で表
面部側へ向けて全反射し、その一部が凸部に入り、集光
されつつ表面部に対してより垂直に立った状態で導光板
の外側に出射する。According to the present invention, a part of the light from the light source that has entered the light guide plate from the incident end face is totally reflected toward the front surface by the rear surface of the light guide plate, and a part of the light is reflected by the protrusion. It enters and exits the light guide plate in a state of standing more perpendicular to the surface while being collected.
【００１３】また、本発明の第２の形態は、光が出射す
る表面部と、この表面部の反対側に位置する裏面部と、
これら表面部および裏面部の一端側に位置する入射端面
部とを有する導光板と、この導光板の前記入射端面部に
向けて光を投射する光源と、前記導光板の前記表面部に
沿った平面部と、前記導光板の前記入射端面部と平行な
方向に延びると共に前記入射端面部と直交する方向に配
列する三角柱状のプリズム面とを有し、前記導光板の前
記表面部に重ね合わされて前記導光板の前記表面部から
出射する光を所定の方向に偏向させるための光偏向板と
を具え、前記導光板の前記表面部には、集光性と方向制
御性とを有し、前記裏面部にて反射した光を当該表面部
から出射させるための複数の凸部が形成されており、こ
れら凸部は、前記表面部に対して垂直に投影した輪郭形
状が三角形をなし、その一辺が前記入射端面部とほぼ平
行に設定されると共に当該一辺がこれに対する頂点より
も前記入射端面部側に位置していることを特徴とする平
面照明装置にある。A second aspect of the present invention is a light emitting device comprising: a front surface from which light is emitted; a back surface located on the opposite side of the front surface;
A light guide plate having an incident end face located on one end side of the front surface and the back face, a light source for projecting light toward the incident end face of the light guide plate, and a light guide plate along the surface of the light guide plate; A plane portion, having a triangular prism-shaped prism surface extending in a direction parallel to the incident end surface portion of the light guide plate and arranged in a direction orthogonal to the incident end surface portion, is superposed on the surface portion of the light guide plate. A light deflecting plate for deflecting light emitted from the surface portion of the light guide plate in a predetermined direction, and the surface portion of the light guide plate has a light collecting property and a direction control property, A plurality of convex portions for emitting light reflected by the back surface portion from the front surface portion are formed, and these convex portions have a triangular contour shape projected perpendicularly to the front surface portion. When one side is set substantially parallel to the incident end face In flat illumination device to which the one side is characterized in that located in the entrance end face side of the top relative thereto.
【００１４】本発明によると、入射端面部から導光板内
に入射した光源からの光の一部は、導光板の裏面部で表
面部側へ向けて全反射し、その一部が凸部に入り、集光
されつつ表面部に対してより垂直に立った状態で導光板
の外側に出射する。このようにして導光板の表面部から
出射した光は、光偏向板により所定の方向に偏向され
る。According to the present invention, a part of the light from the light source that has entered the light guide plate from the incident end face part is totally reflected toward the front surface part on the back surface part of the light guide plate, and part of the light is reflected on the convex part. It enters and exits the light guide plate in a state of standing more perpendicular to the surface while being collected. The light emitted from the surface of the light guide plate is deflected in a predetermined direction by the light deflector.
【００１５】[0015]
【発明の実施の形態】本発明による導光板または平面照
明装置において、導光板の裏面部に入射端面部と平行な
方向に配列すると共に入射端面部と直交する方向に延び
る三角柱状のプリズム面を形成するようにしてもよい。
また、表面部に対して垂直に投影した輪郭形状が三角形
をなし、その一辺が入射端面部とほぼ平行に設定される
と共に当該一辺に対する頂点が該一辺よりも入射端面部
側に位置する第２の凸部を表面部に複数形成するように
してもよい。DESCRIPTION OF THE PREFERRED EMBODIMENTS In a light guide plate or a planar lighting device according to the present invention, a triangular prism-shaped prism surface arranged in a direction parallel to an incident end surface portion and extending in a direction perpendicular to the incident end surface portion is provided on the back surface of the light guide plate. It may be formed.
Further, the contour shape perpendicularly projected to the surface portion forms a triangle, one side of which is set substantially parallel to the incident end face portion, and the vertex for the one side is located closer to the incident end face portion side than the one side. May be formed on the surface portion.
【００１６】この場合、第１および第２の凸部の三角形
は、二等辺三角形であることが好ましく、表面部に対し
て傾斜し、かつ一辺を含む錐面と、表面部に対してほぼ
垂直な一対の錐面とからなる三角錐であってもよいし、
三角柱状であってもよい。これら第１および第２の凸部
は、一辺を共有して一体的に形成されていてもよく、こ
の場合、全体として四角柱状をなすものであってもよ
い。さらに、この三角形の頂点を含む二つの斜辺のなす
角は、凸部を構成する材料の屈折率をｎ、凸部に入射す
る光線と平面部とのなす角をβとした場合、tan -1［ c
osβ・ tan｛π−２sin -1(1/n) ｝］以上であることが
望ましい。また、表面部の単位面積当たりに占める第１
の凸部の割合を入射端面部から離れるほど大きく設定し
たり、表面部の単位面積当たりに占める第１および第２
の凸部の割合を入射端面部の長手方向に沿った表面部の
幅方向両側端部で相対的に大きく設定することが望まし
い。これら第１および第２の凸部は、表面部にランダム
に配置されていることが有効であり、これらの大きさ
は、１５０μm 以下であることが好ましい。さらに、第
１の凸部の２つの斜辺の長さと、第２の凸部の２つの斜
辺の長さとが相互に異なっていてもよい。In this case, the triangles of the first and second projections are preferably isosceles triangles, and are inclined with respect to the surface and include a conical surface including one side and substantially perpendicular to the surface. It may be a triangular pyramid consisting of a pair of pyramids,
It may have a triangular prism shape. These first and second projections may be integrally formed with one side shared, and in this case, the first and second projections may be in the shape of a quadrangular prism as a whole. Further, the angle formed by the two hypotenuses including the apex of the triangle is n, where n is the refractive index of the material forming the convex portion, and β is the angle formed between the light beam incident on the convex portion and the plane portion, and tan -1 [C
osβ · tan {π−2 sin −1 (1 / n)}] or more. In addition, the first portion of the surface portion per unit area
The ratio of the convex portion is set to be larger as the distance from the incident end face portion increases, or the first and second portions occupying a unit area of the surface portion are increased.
It is desirable to set the ratio of the convex portions relatively large at both end portions in the width direction of the surface portion along the longitudinal direction of the incident end face portion. It is effective that the first and second convex portions are randomly arranged on the surface portion, and the size thereof is preferably 150 μm or less. Further, the lengths of the two oblique sides of the first convex portion and the lengths of the two oblique sides of the second convex portion may be different from each other.
【００１７】一方、本発明による平面照明装置におい
て、導光板の表面部および入射端面部以外の部分を覆う
光反射シートをさらに設けてもよい。また、光偏向板の
プリズム面および平面部の少なくとも一方に光拡散用の
微小凹凸を形成するようにしてもよい。さらに、光偏向
板の平面部と導光板の入射端面部側ほど平面部との間隔
が拡がる傾斜面とのなす角を、平面部と入射端面部側ほ
ど平面部との間隔が狭まる傾斜面とのなす角よりも小さ
くするようにしてもよい。On the other hand, in the flat lighting device according to the present invention, a light reflecting sheet may be further provided to cover portions other than the surface portion and the incident end surface portion of the light guide plate. Further, minute irregularities for light diffusion may be formed on at least one of the prism surface and the flat portion of the light deflection plate. Furthermore, the angle between the flat portion of the light deflector plate and the inclined surface where the distance between the flat surface portion and the incident end surface portion of the light guide plate is increased, and the inclined surface where the distance between the flat surface portion and the flat surface portion decreases toward the incident end surface portion. The angle may be smaller than the angle formed.
【００１８】[0018]
【実施例】本発明による導光板を組み込んだ本発明によ
る平面照明装置の実施例について、図１〜図１０を参照
しながら詳細に説明するが、本発明はこのような実施例
に限らず、これらをさらに組み合わせたり、同様な課題
を内包する他の分野の技術にも応用することができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flat lighting device according to the present invention incorporating a light guide plate according to the present invention will be described in detail with reference to FIGS. 1 to 10, but the present invention is not limited to such an embodiment. These can be further combined, or applied to technologies in other fields that include similar problems.
【００１９】本発明の第１の実施例による平面照明装置
の断面構造を図１に示し、その分解した状態の外観を図
２に示す。すなわち、本実施例における平面照明装置１
１は、矩形の板状をなす導光板１２と、この導光板１２
の入射端面部１３に沿って配置される線状の光源ランプ
１４と、導光板１２の表面部１５に重ね合わされる光偏
向板１６と、導光板１２の入射端面部１３および表面部
１５以外の部分を覆う光反射シート１７とを有する。ま
た、冷陰極管や複数のＬＥＤにて構成される光源ランプ
１４は、反射面が凹曲面となったリフレクタ１８で囲ま
れており、このリフレクタ１８からの反射光は、表面部
１５とほぼ平行に導光板１２の入射端面部１３から導光
板１２内に入射するようになっている。FIG. 1 shows a sectional structure of a flat lighting device according to a first embodiment of the present invention, and FIG. That is, the flat lighting device 1 in the present embodiment
1 is a light guide plate 12 having a rectangular plate shape, and the light guide plate 12
, A linear light source lamp 14 disposed along the incident end face portion 13, a light deflecting plate 16 superposed on the surface portion 15 of the light guide plate 12, and a light source plate other than the incident end face portion 13 and the surface portion 15 of the light guide plate 12. And a light reflection sheet 17 covering the portion. The light source lamp 14 composed of a cold-cathode tube or a plurality of LEDs is surrounded by a reflector 18 having a concave reflecting surface, and the reflected light from the reflector 18 is substantially parallel to the surface 15. The light enters the light guide plate 12 from the incident end face 13 of the light guide plate 12.
【００２０】本実施例における導光板１２は、透明なア
クリル樹脂（ＰＭＭＡ）にて形成され、光源ランプ１４
からの光を導入するための入射端面部１３と、この入射
端面部１３の反対側に位置する反射端面部１９と、これ
ら入射端面部１３および反射端面部１９の両側端に接続
する一対の側端面部２０と、これら入射端面部１３およ
び反射端面部１９および側端面部２０で囲まれて入射端
面部１３から入射した光を出射させるための表面部１５
およびその反対側に位置する裏面部２１とを有する。ま
た、表面部１５と裏面部２１との間隔が入射端面部１３
側に対して反射端面部１９側ほど狭くなるように、表面
部１５に対して裏面部２１が０. ５度から１度程度傾斜
したテーパ状となっている。The light guide plate 12 in this embodiment is formed of a transparent acrylic resin (PMMA),
End face 13 for introducing light from the light source, a reflection end face 19 located on the opposite side of the incidence end face 13, and a pair of sides connected to both ends of the incidence end face 13 and the reflection end face 19. An end surface portion 20 and a surface portion 15 surrounded by the incident end surface portion 13, the reflection end surface portion 19, and the side end surface portion 20 for emitting light incident from the incident end surface portion 13.
And a back surface portion 21 located on the opposite side. Further, the distance between the front surface portion 15 and the back surface portion 21 is changed to the incident end surface portion 13.
The back surface 21 is tapered at an angle of about 0.5 to 1 degree with respect to the front surface 15 so as to become narrower toward the reflection end surface 19 with respect to the side.
【００２１】前述した光反射シート１７は、導光板１２
の反射端面部１９と一対の側端面部２０と裏面部２１と
を覆い、これらから出射する光を再び導光板１２内に反
射させて導光板１２の表面部１５から出射させるための
ものであり、白色の紙などを折り曲げたものである。The light reflecting sheet 17 described above is used for the light guide plate 12.
For reflecting the light emitted therefrom from the front surface 15 of the light guide plate 12 by reflecting the light emitted therefrom back into the light guide plate 12 again. , White paper or the like.
【００２２】導光板１２の表面部１５を模式的に図３に
示し、本実施例における第１の凸部の抽出拡大形状を図
４に示す。すなわち、導光板１２の表面部１５には、こ
の表面部１５に対して垂直に投影した輪郭形状が三角形
をなし、一対の対称な垂直錐面２２と傾斜錐面２３とを
有する二等辺三角錐形の第１の凸部２４がランダムに配
置され、これら第１の凸部２４と後述する光偏向板１６
との間、およびこの平面照明装置を液晶ディスプレィの
バックライト光源として使用した場合における液晶パネ
ルのセルと第１の凸部２４との間でそれぞれモアレ縞な
どが発生しないように配慮している。この場合、個々の
第１の凸部２４を肉眼にて識別できないように、各第１
の凸部２４の任意の一辺をそれぞれ１５０μm 以下の大
きさに設定することが好ましいが、製造の容易性を考慮
して１０μm 以上であることが望ましく、第１の凸部２
４の大きさを１０〜１５０μm の範囲に設定することに
より、従来のような光拡散板を使用する必要がなくな
り、光の進行方向を比較的容易に制御することが可能と
なる。FIG. 3 schematically shows the surface portion 15 of the light guide plate 12, and FIG. 4 shows an extracted and enlarged shape of the first convex portion in this embodiment. That is, on the surface portion 15 of the light guide plate 12, an isosceles triangular pyramid having a pair of symmetrical vertical pyramids 22 and inclined pyramids 23 is formed on the surface portion 15 of the light guide plate 12. The first convex portions 24 are randomly arranged, and the first convex portions 24 and the light deflector 16
And when the flat illuminating device is used as a backlight source of a liquid crystal display, so that moire fringes and the like do not occur between the cell of the liquid crystal panel and the first convex portion 24. In this case, each of the first convex portions 24 is invisible to the naked eye so that each
It is preferable that each side of the convex portion 24 is set to have a size of 150 μm or less, but it is preferably 10 μm or more in consideration of manufacturing easiness.
By setting the size of 4 to a range of 10 to 150 μm, it is not necessary to use a light diffusing plate as in the prior art, and the traveling direction of light can be controlled relatively easily.
【００２３】また、第１の凸部２４の垂直錐面２２は、
表面部１５に対して垂直をなしていることが好ましいけ
れども、導光板１２の製造時における金型に対する適当
な抜き勾配を設定する必要上、表面部１５とのなす角が
９０度を越えるように設定してもよい。また、突部２４
の傾斜錐面２３の底辺２５は、入射端面部１３とほぼ平
行に設定されている。The vertical conical surface 22 of the first projection 24 is
Although it is preferable that the surface portion 15 is perpendicular to the surface portion 15, it is necessary to set an appropriate draft angle with respect to the mold at the time of manufacturing the light guide plate 12, so that the angle formed with the surface portion 15 exceeds 90 degrees. May be set. Also, the protrusion 24
The bottom 25 of the inclined conical surface 23 is set substantially parallel to the incident end face 13.
【００２４】ところで、導光板１２の入射端面部１３に
入射角、すなわち表面部１５と光線とのなす角がγで入
射する光線は、導光板１２を構成する材料の屈折率ｎ
（本実施例のアクリル樹脂の場合、ｎ＝１. ４９）に応
じて ０≦｜γ｜≦sin -1（ｌ／ｎ） を満たす入射角γの範囲で導光板１２内を進行する。そ
して、表面部１５側へ伝播する光線の一部は、第１の凸
部２４内に入り、他の一部は表面部１５からそのまま導
光板１２の外側に出射し、残りは表面部１５で全反射し
て裏面部２１側へ伝播する。The light beam incident on the incident end face 13 of the light guide plate 12 at an angle of γ, ie, the angle formed between the surface portion 15 and the light beam, has a refractive index n of the material constituting the light guide plate 12.
(In the case of the acrylic resin of this embodiment, n = 1.49), the light travels through the light guide plate 12 within the range of the incident angle γ satisfying 0 ≦ | γ | ≦ sin −1 (1 / n). Part of the light beam propagating toward the surface portion 15 enters the first convex portion 24, and the other portion is emitted from the surface portion 15 to the outside of the light guide plate 12 as it is, and the rest is generated by the surface portion 15. The light is totally reflected and propagates to the back surface 21 side.
【００２５】表面部１５および光偏向板１６の側面形状
を拡大して図５に示し、第１の凸部２４の平面形状を図
６に示す。すなわち、第１の凸部２４内に入った光線Ｌ
が一対の垂直錐面２２で全反射せずにここから出射する
ためには、表面部１５と平行な平面内を進行する光線Ｌ
を考えた場合、垂直錐面２２に対する光線Ｌの入射角を
θとすると、 θ≦sin -1（ｌ／ｎ） を満足する必要がある。ここで、円周率をπとすると、
一対の垂直錐面２２のなす角α1 は、α1 ＝２・｛（π
／２）−θ｝であるから、 α1 ≧π−２sin -1（ｌ／ｎ） となるが、実際問題として、光線Ｌの光路を含む平面
は、表面部１５に対して傾斜しており、この平面内にお
ける一対の垂直錐面２２のなす角αは、光線Ｌと表面部
１５とのなす角をβとした時、tan α＝cos β・tan α
1 であるから、 α≧tan -1［ cosβ・ tan｛π−２sin -1(1/n) ｝］ を満足すればよいことが判る。FIG. 5 is an enlarged side view of the surface portion 15 and the light deflecting plate 16, and FIG. 6 is a plan view of the first convex portion 24. That is, the light beam L entering the first convex portion 24
Is emitted from the pair of vertical conical surfaces 22 without being totally reflected by the pair of vertical conical surfaces 22.
When considering the angle of incidence of the light beam L with respect to the vertical conical surface 22 as θ, it is necessary to satisfy θ ≦ sin −1 (l / n). Here, if the pi is π,
The angle α 1 formed by the pair of vertical conical surfaces 22 is α 1 = 2 ｛(π
/ 2) −θ｝, so that α 1 ≧ π−2 sin −1 (1 / n). However, as a practical matter, the plane including the optical path of the light beam L is inclined with respect to the surface portion 15. The angle α formed by the pair of vertical pyramids 22 in this plane is tan α = cos β · tan α, where β is the angle formed between the light ray L and the surface portion 15.
Since it is 1 , it can be seen that it suffices to satisfy α ≧ tan −1 [cos β · tan ｛π−2 sin −1 (1 / n)｝].
【００２６】具体的には、屈折率ｎが１. ４９のアクリ
ル樹脂を導光板１２として採用した本実施例では、集光
性を良くするためにαが８５〜１３５度の範囲にあるこ
とが望ましい。また、実際問題として、光線Ｌの光路を
含む平面は表面部１５に対して傾斜しており、この光線
Ｌと表面部１５とのなす角をβとした場合、これが垂直
錐面２２で全反射せずにここから出射するためには、 β≦（３／２）・sin -1（ｌ／ｎ） を満足する必要がある。ここで、β＝（３／２）・sin
-1（ｌ／ｎ）の場合、本実施例における上述のαは約１
３５度となるので、αが９５度から１３５度の範囲に収
まるように、第１の凸部２４を形成することが好まし
い。More specifically, in this embodiment in which an acrylic resin having a refractive index n of 1.49 is used as the light guide plate 12, α may be in the range of 85 to 135 degrees in order to improve the light collecting property. desirable. Further, as a practical problem, the plane including the optical path of the light ray L is inclined with respect to the surface portion 15, and when the angle between the light beam L and the surface portion 15 is β, this is the total reflection at the vertical conical surface 22. In order to emit from here without performing, it is necessary to satisfy β ≦ (3/2) · sin −1 (1 / n). Where β = (3/2) · sin
In the case of -1 (l / n), the above-mentioned α in this embodiment is about 1
Since the angle is 35 degrees, it is preferable to form the first protrusion 24 so that α falls within the range of 95 degrees to 135 degrees.
【００２７】つまり、上述した第１の凸部２４は表面部
１５から出射する光の向きをより垂直に偏向させるよう
に機能する。That is, the above-mentioned first convex portion 24 functions to deflect the direction of light emitted from the surface portion 15 more vertically.
【００２８】光源ランプ１４から導光板１２に入射した
光線は、この導光板１２中を進行するに連れてそのエネ
ルギが減少するため、導光板１２の表面部１５に突設さ
れた第１の凸部２４の占有率を漸次変化させる必要があ
る。具体的には表面部１５から出射する光線がこの表面
部１５全体に亙って均一な輝度となるように、表面部１
５の単位面積当たりに占める第１の凸部２４の面積割合
（以下、これを占有率と記述する）は、光源ランプ１４
からの光の進行方向（図１中、右方向）に沿った表面部
１５の位置と第１の凸部２４の占有率との関係を表す図
７に示すように、反射端面部１９側ほど大きな占有率と
なるようにランダムに設定されている。Since the energy of the light beam incident on the light guide plate 12 from the light source lamp 14 decreases as it travels through the light guide plate 12, the first protrusion protruding from the surface portion 15 of the light guide plate 12. It is necessary to gradually change the occupancy of the part 24. Specifically, the surface portion 1 is so set that the light emitted from the surface portion 15 has a uniform brightness over the entire surface portion 15.
The area ratio of the first protrusions 24 per unit area of the light source lamp 14 (hereinafter referred to as the occupation ratio)
As shown in FIG. 7 showing the relationship between the position of the surface portion 15 along the traveling direction of light from the surface (the right direction in FIG. 1) and the occupancy of the first protrusion 24, the closer to the reflection end face portion 19, They are set randomly so as to have a large occupancy.
【００２９】この場合、導光板１２の入射端面部１３に
近接する表面部１５は、光源ランプ１４からの光が直接
透過して輝度が高くなる傾向を有するため、入射端面部
１３に近接する裏面部２１における第１の凸部２４の占
有率をこれに続く部分よりも小さめに設定している。同
様に、導光板１２の反射端面部１９に近接する表面部１
５は、反射端面部１９からの反射光が透過して輝度が高
くなる傾向を有するため、反射端面部１９に近接する裏
面部２１における第１の凸部２４の占有率をこれに続く
部分よりも小さめに設定している。In this case, the front surface portion 15 of the light guide plate 12 which is close to the incident end surface portion 13 has a tendency that the light from the light source lamp 14 is directly transmitted to increase the luminance. The occupation ratio of the first convex portion 24 in the portion 21 is set to be smaller than that in the portion following the first convex portion 24. Similarly, the surface portion 1 of the light guide plate 12 adjacent to the reflection end surface portion 19
5 has a tendency that the reflected light from the reflection end face portion 19 is transmitted and the luminance is increased, so that the occupation ratio of the first convex portion 24 on the back surface portion 21 close to the reflection end face portion 19 is higher than that of the subsequent portion. Is also set smaller.
【００３０】なお、光源ランプ１４の発光領域が導光板
１２の入射端面部１３の幅寸法より短い場合には、導光
板１２の幅方向両側端部に入射する光量が不足する傾向
を持つ。このため、導光版１２の表面部１５の幅方向両
側端部における第１の凸部２４の占有率を他の部分より
も相対的に大きく設定しておくことが望ましい。何れの
場合にも、本実施例では第１の凸部２４の占有率の最大
値を約７０％程度に設定しているが、それ以上の値に設
定することも当然可能である。When the light-emitting area of the light source lamp 14 is shorter than the width of the incident end face 13 of the light guide plate 12, the amount of light incident on both ends in the width direction of the light guide plate 12 tends to be insufficient. For this reason, it is desirable that the occupation ratio of the first protrusions 24 at both end portions in the width direction of the surface portion 15 of the light guide plate 12 is set to be relatively larger than other portions. In any case, in this embodiment, the maximum value of the occupancy of the first convex portion 24 is set to about 70%, but it is naturally possible to set the maximum value to a value higher than about 70%.
【００３１】前記光偏向板１６の側面形状を図５に示
す。すなわち、本実施例における光偏向板１６は、透明
なアクリル樹脂にて形成され、導光板１２の表面部１５
と対向する平滑な平面部２６と、導光板１２の入射端面
部１３と平行な方向に延びると共に入射端面部１３と直
交する方向に配列する三角柱状のプリズム面２７とを有
する。このプリズム面２７は、導光板１２の入射端面部
１３側ほど平面部２６との間隔が拡がる第１の傾斜面２
８と、この第１の傾斜面２８に続く第２の傾斜面２９と
を交互に有し、平面部２６と第１の傾斜面２８とのなす
角δ1 は、平面部２６と第２の傾斜面２９とのなす角δ
2 よりも小さく、例えばδ1 を（２８±３）度に設定
し、δ2 を（６２±３）度に設定している。FIG. 5 shows a side view of the light deflection plate 16. That is, the light deflecting plate 16 in the present embodiment is formed of a transparent acrylic resin,
And a triangular prism-shaped prism surface 27 extending in a direction parallel to the incident end face 13 of the light guide plate 12 and arranged in a direction orthogonal to the incident end face 13. The prism surface 27 is formed on the first inclined surface 2 in which the distance from the plane portion 26 increases toward the incident end surface portion 13 of the light guide plate 12.
8 and a second inclined surface 29 following the first inclined surface 28 are alternately formed, and the angle δ 1 formed between the plane portion 26 and the first inclined surface 28 is Angle δ with inclined surface 29
Less than 2, is set to, for example, [delta] 1 a (28 ± 3) degrees, and set the [delta] 2 to (62 ± 3) degrees.
【００３２】本実施例におけるプリズム面２７は、この
プリズム面２７から出射する光をある程度拡散させるた
めの適当な表面粗さを有する微小な凹凸を有している
が、この微小な凹凸を平面部２６に形成するようにして
もよい。また、第１の凸部２４を三角錐形に設定した
が、三角柱状にすることも可能であり、この場合にも先
の実施例と同様な効率の良い導光板を得ることができ
る。The prism surface 27 in this embodiment has minute irregularities having an appropriate surface roughness for diffusing light emitted from the prism surface 27 to some extent. 26 may be formed. Further, although the first convex portion 24 is set in a triangular pyramid shape, it may be formed in a triangular prism shape. In this case, an efficient light guide plate similar to the above embodiment can be obtained.
【００３３】次に、本発明による第２の実施例につい
て、図８〜図１０を参照しながら詳細に説明するが、先
の実施例と同一機能の部材にはこれと同一符号を記すに
止め、重複する説明は省略するものとする。Next, a second embodiment according to the present invention will be described in detail with reference to FIGS. 8 to 10. However, members having the same functions as those in the previous embodiment are denoted by the same reference numerals. , Overlapping description will be omitted.
【００３４】すなわち、実施例による平面照明装置の断
面構造を表す図８および凸部を抽出拡大した図９および
図８中のＸ−Ｘ矢視断面構造を表す図１０に示すよう
に、本実施例における導光板３０の表面部１５には、こ
の表面部１５に対して垂直に投影した輪郭形状が菱形を
なす第２の凸部３１が形成されている。本実施例におけ
る第２の凸部３１は、先の実施例の第１の凸部２４の底
辺２５と接して向かい合うように組み合わされ、入射端
面部１３とほぼ平行に設定された底辺２５に対する頂点
がこの底辺２５よりも入射端面部１３側に位置してお
り、一対の対称な垂直錐面３２と傾斜錐面３３とを有す
る二等辺三角錐である。本実施例では、第１の凸部２４
と第２の凸部３１とが底辺２５を対称軸とする鏡像関係
に設定されており、この場合、一方の垂直錐面２２の斜
辺の長さに対して他方の垂直錐面３２の斜辺の長さが異
なっていてもよく、底辺２５に対して直交する対角線Ｃ
に関して対称であることが望ましい。That is, as shown in FIG. 8 showing the cross-sectional structure of the flat lighting device according to the embodiment, and FIG. 9 showing the cross-sectional structure taken along the line XX in FIG. On the surface portion 15 of the light guide plate 30 in the example, a second convex portion 31 having a rhombic outline shape projected perpendicularly to the surface portion 15 is formed. The second convex portion 31 in this embodiment is combined so as to be in contact with and opposed to the bottom 25 of the first convex portion 24 in the previous embodiment, and a vertex with respect to the bottom 25 set substantially parallel to the incident end face portion 13. Is an isosceles triangular pyramid which is located closer to the incident end face portion 13 than the bottom side 25 and has a pair of symmetric vertical pyramids 32 and inclined pyramids 33. In the present embodiment, the first protrusion 24
And the second convex portion 31 are set in a mirror image relationship with the base 25 as a symmetry axis. In this case, the length of the hypotenuse of one vertical pyramid surface 22 is equal to the length of the hypotenuse of the other vertical pyramid surface 32. Diagonal line C orthogonal to base 25, which may be different in length
It is desirable to be symmetric with respect to.
【００３５】第２の凸部３１は、反射端面部１９側から
入射端面部１３側へ導光板３０内を戻る光を表面部１５
の外へ導き出すのに主として機能するものである。この
ため、先の実施例のように表面部１５に対して裏面部２
１をテーパ状に傾斜させる必要がなくなり、入射端面部
１３側および反射端面部１９側共に均一な板厚に設定す
ることが可能である。The second convex portion 31 transmits light returning inside the light guide plate 30 from the reflection end surface portion 19 side to the incident end surface portion 13 side.
It mainly functions to bring out the outside. Therefore, as in the previous embodiment, the back surface 2
It is not necessary to incline 1 in a tapered shape, and it is possible to set a uniform plate thickness on both the incident end face portion 13 side and the reflective end face portion 19 side.
【００３６】また、前記導光板３０の裏面部２１には、
入射端面部１３と平行な方向に配列すると共にこの入射
端面部１３と直交する方向に延びて周知の如き光反射機
能を持つ三角柱状のプリズム面３４が形成されており、
これら第１および第２の凸部２４, ３１とプリズム面３
４とよって、導光板３０の表面部１５からほぼ垂直の方
向に出射光の方向を制御している。The back surface 21 of the light guide plate 30 includes
A triangular prism-shaped prism surface 34 having a light reflecting function, which is arranged in a direction parallel to the incident end surface portion 13 and extends in a direction orthogonal to the incident end surface portion 13 and has a well-known light reflecting function, is formed.
These first and second convex portions 24, 31 and prism surface 3
4 controls the direction of emitted light in a direction substantially perpendicular to the surface portion 15 of the light guide plate 30.
【００３７】また、本実施例における光偏向板３５のプ
リズム面３６は、頂角が９０度よりも小さな鋭角二等辺
三角柱をなし、導光板３０の表面部１５と対向するよう
に導光板３０の表面部１５に重ね合わされた状態で配置
されている。The prism surface 36 of the light deflecting plate 35 in the present embodiment forms an acute isosceles triangular prism having a vertex angle smaller than 90 degrees, and the light guide plate 30 is opposed to the surface portion 15 of the light guide plate 30. It is arranged in a state of being superimposed on the surface portion 15.
【００３８】このように、本実施例では反射端面部１９
側から入射端面部１３側へ導光板３０内を戻る光も積極
的に表面部１５から導き出すようにしているため、導光
板３０の表面部１５と正対する方向に強い輝度の光が放
射される。As described above, in this embodiment, the reflection end face 19
Since the light returning inside the light guide plate 30 from the side to the incident end face portion 13 side is also positively led out from the surface portion 15, light of high luminance is emitted in a direction directly facing the surface portion 15 of the light guide plate 30. .
【００３９】上述した実施例では、第１の凸部２４と第
２の凸部３１とを組み合わせた形状に設定したが、傾斜
錐面２３, ３３を表面部１５と平行に設定することによ
って四角柱状にすることも可能であり、この場合にも先
の実施例と同様な効率の良い導光板を得ることができ
る。また、第２の凸部３１を第１の凸部２４と離して別
々に配置し、この第１の凸部２４の分布状態に対して異
なる分布状態、例えば入射端面部１３側ほど多くなるよ
うに配置することも可能であり、これによって反射端面
部１９側から戻る光もより均一に導光板３０の表面部１
５から導き出すことができる。In the above-described embodiment, the shape is such that the first convex portion 24 and the second convex portion 31 are combined. However, by setting the inclined conical surfaces 23 and 33 to be parallel to the surface portion 15, the square is formed. It is also possible to form a columnar shape, and in this case also, it is possible to obtain an efficient light guide plate similar to the above embodiment. In addition, the second convex portions 31 are separately arranged separately from the first convex portions 24, and the distribution is different from the distribution of the first convex portions 24, for example, the distribution is increased toward the incident end face 13. It is also possible to dispose the light returning from the reflection end face 19 side more uniformly on the surface 1 of the light guide plate 30.
5 can be derived.
【００４０】[0040]
【発明の効果】本発明の導光板および平面照明装置によ
ると、集光性と方向制御性とを有し、導光板の入射端面
部から入射した光を表面部から出射させるための複数の
凸部をこの導光板の表面部に形成したので、入射端面部
から導光板内に入射した光源からの光の一部は、導光板
の裏面部で全反射し、損失なく導光板の表面部から導光
板の外側に出射させることができる。このため、光の損
失や消費電力が少なく、しかもより薄型の平面照明装置
を得ることができる。According to the light guide plate and the planar lighting device of the present invention, the light guide plate and the flat illuminator have a light collecting property and a direction controllability, and a plurality of protrusions for emitting the light incident from the incident end face portion of the light guide plate from the surface portion. Part of the light from the light source, which is incident on the light guide plate from the incident end face, is totally reflected by the rear surface of the light guide plate, and is lost from the surface of the light guide plate without loss. The light can be emitted outside the light guide plate. For this reason, it is possible to obtain a thinner flat lighting device with less light loss and power consumption.
【００４１】また、導光板の表面部に突設した凸部を、
入射端面部から離れるほど裏面部の単位面積当たりに占
める割合が大きくなるように設定したので、出射光の輝
度分布を均一にすることができる上、凸部の大きさを１
０〜１５０μm にしたことによって、凸部の目立たない
良好な導光板を得ることができ、光拡散板を併用する必
要がなくなる。Further, the protrusion protruding from the surface of the light guide plate is
Since the ratio of the back surface to the unit area per unit area increases as the distance from the incident end surface increases, the luminance distribution of the outgoing light can be made uniform, and the size of the protrusion is reduced to 1
By setting the thickness to 0 to 150 μm, it is possible to obtain a good light guide plate with less prominent projections, and it is not necessary to use a light diffusion plate together.
【００４２】さらに、凸部の占有率を制御することによ
って、所望の輝度分布を有する導光板を得ることができ
る。Further, a light guide plate having a desired luminance distribution can be obtained by controlling the occupancy of the convex portions.
【図１】本発明による平面照明装置の第１の実施例の概
略構造を表す断面図である。FIG. 1 is a sectional view showing a schematic structure of a first embodiment of a flat lighting device according to the present invention.
【図２】図１に示した実施例の分解斜視図である。FIG. 2 is an exploded perspective view of the embodiment shown in FIG.
【図３】図１に示した実施例における導光板の表面部の
外観を表す平面図である。FIG. 3 is a plan view showing an appearance of a surface portion of a light guide plate in the embodiment shown in FIG.
【図４】図１に示した実施例における凸部の外観を抽出
して表す拡大斜視図である。FIG. 4 is an enlarged perspective view extracting and showing an appearance of a convex portion in the embodiment shown in FIG.
【図５】図１に示した実施例における表面部および光偏
向板の側面形状を抽出して表す拡大側面図である。FIG. 5 is an enlarged side view extracting and representing the side surface shapes of the surface portion and the light deflecting plate in the embodiment shown in FIG. 1;
【図６】図１に示した実施例における凸部の平面図であ
る。FIG. 6 is a plan view of a protrusion in the embodiment shown in FIG. 1;
【図７】入射端面部から反射端面部に至る導光板の表面
部と、その単位面積当たりの凸部の占有率との関係を表
すグラフである。FIG. 7 is a graph showing a relationship between a surface portion of a light guide plate from an incident end surface portion to a reflection end surface portion and an occupation ratio of a convex portion per unit area thereof.
【図８】本発明による平面照明装置の第２の実施例の概
略構造を表す断面図である。FIG. 8 is a sectional view showing a schematic structure of a second embodiment of the flat lighting device according to the present invention.
【図９】図８に示した実施例における凸部の外観を抽出
して表す拡大斜視図である。FIG. 9 is an enlarged perspective view extracting and showing the appearance of the protrusion in the embodiment shown in FIG. 8;
【図１０】図８中のＸ−Ｘ矢視断面図である。FIG. 10 is a sectional view taken along the line XX in FIG. 8;
１１ 平面照明装置 １２ 導光板 １３ 入射端面部 １４ 光源ランプ １５ 表面部 １６ 光偏向板 １７ 光反射シート １８ リフレクタ １９ 反射端面部 ２０ 側端面部 ２１ 裏面部 ２２ 垂直錐面 ２３ 傾斜錐面 ２４ 第１の凸部 ２５ 傾斜錐面の底辺 ２６ 平面部 ２７ プリズム面 ２８ 第１の傾斜面 ２９ 第２の傾斜面 ３０ 導光板 ３１ 第２の凸部 ３２ 垂直錐面 ３３ 傾斜錐面 ３４ プリズム面 ３５ 光偏向板 ３６ プリズム面 α 一対の垂直錐面のなす角 β 平面部と光線とのなす角 δ1 平面部と第１の傾斜面とのなす角 δ2 平面部と第２の傾斜面とのなす角 Ｌ 光線 Ｃ 対角線DESCRIPTION OF SYMBOLS 11 Planar illumination device 12 Light guide plate 13 Incident end face part 14 Light source lamp 15 Surface part 16 Light deflector 17 Light reflection sheet 18 Reflector 19 Reflection end face part 20 Side end face 21 Back part 22 Vertical conical surface 23 Inclined conical surface 24 First Convex portion 25 Base of inclined conical surface 26 Flat portion 27 Prism surface 28 First inclined surface 29 Second inclined surface 30 Light guide plate 31 Second convex portion 32 Vertical conical surface 33 Inclined conical surface 34 Prism surface 35 Light deflection plate 36 prism surface α angle formed by a pair of vertical conical surfaces β angle formed by plane portion and light beam δ angle formed by 1 plane portion and first inclined surface δ 2 angle formed by plane portion and second inclined surface L Ray C diagonal
Claims (12)
対側に位置する裏面部と、これら表面部および裏面部の
一端側に位置して光源からの光を導入するための入射端
面部とを有し、この入射端面部から入射した光を前記表
面部から出射させるための導光板であって、 前記表面部には、集光性と方向制御性とを有し、前記裏
面部にて反射した光を当該表面部から出射させるための
複数の凸部が形成されており、 これら凸部は、前記表面部に対して垂直に投影した輪郭
形状が三角形をなし、その一辺が前記入射端面部とほぼ
平行に設定されると共に当該一辺がこれに対する頂点よ
りも前記入射端面部側に位置していることを特徴とする
導光板。1. A front surface portion from which light is emitted, a back surface portion opposite to the front surface portion, and an incident end surface located at one end of the front surface portion and the back surface portion for introducing light from a light source. A light guide plate for emitting light incident from the incident end face portion from the front surface portion, wherein the front surface portion has a light collecting property and a direction controllability, and the back face portion A plurality of convex portions for emitting the light reflected at the surface portion from the surface portion are formed, and these convex portions have a triangular contour shape projected perpendicularly to the surface portion, and one side thereof is the triangular shape. A light guide plate, which is set substantially parallel to the incident end face, and wherein the one side is located closer to the incident end face than the apex thereof.
形状が三角形をなし、その一辺が前記入射端面部とほぼ
平行に設定されると共に当該一辺に対する頂点が該一辺
よりも前記入射端面部側に位置する第２の凸部を前記表
面部に複数形成したことを特徴とする請求項１に記載の
導光板。2. A contour projected perpendicular to the surface portion forms a triangle, one side of which is set to be substantially parallel to the incident end surface portion, and a vertex for the one side is set to the incident end surface portion more than the one side. The light guide plate according to claim 1, wherein a plurality of second convex portions located on the side are formed on the surface portion.
は、前記表面部に対して傾斜し、かつ前記一辺を含む錐
面と、前記表面部に対してほぼ垂直な一対の錐面とから
なる三角錐であることを特徴とする請求項１または請求
項２に記載の導光板。3. The first convex portion and the second convex portion are inclined with respect to the surface portion and have a conical surface including the one side and a pair of cones substantially perpendicular to the surface portion. The light guide plate according to claim 1, wherein the light guide plate is a triangular pyramid including a surface.
は、それぞれ三角柱状をなすことを特徴とする請求項１
または請求項２に記載の導光板。4. The device according to claim 1, wherein each of the first and second convex portions has a triangular prism shape.
Alternatively, the light guide plate according to claim 2.
前記一辺を共有して一体的に形成されていることを特徴
とする請求項１から請求項３の何れかに記載の導光板。5. The first projection and the second projection,
The light guide plate according to claim 1, wherein the light guide plate is formed integrally with the one side.
部と平行な方向に配列すると共に前記入射端面部と直交
する方向に延びる三角柱状のプリズム面が形成されてい
ることを特徴とする請求項１から請求項６の何れかに記
載の導光板。6. A triangular prism-shaped prism surface arranged in a direction parallel to the incident end face and extending in a direction perpendicular to the incident end face is formed on a back surface of the light guide plate. The light guide plate according to any one of claims 1 to 6, wherein
対側に位置する裏面部と、これら表面部および裏面部の
一端側に位置する入射端面部とを有する導光板と、 この導光板の前記入射端面部に向けて光を投射する光源
と、 前記導光板の前記表面部に沿った平面部と、前記導光板
の前記入射端面部と平行な方向に延びると共に前記入射
端面部と直交する方向に配列する三角柱状のプリズム面
とを有し、前記導光板の前記表面部に重ね合わされて前
記導光板の前記表面部から出射する光を所定の方向に偏
向させるための光偏向板とを具え、前記導光板の前記表
面部には、集光性と方向制御性とを有し、前記裏面部に
て反射した光を当該表面部から出射させるための複数の
凸部が形成されており、 これら凸部は、前記表面部に対して垂直に投影した輪郭
形状が三角形をなし、その一辺が前記入射端面部とほぼ
平行に設定されると共に当該一辺がこれに対する頂点よ
りも前記入射端面部側に位置していることを特徴とする
平面照明装置。7. A light guide plate having a front surface from which light is emitted, a back surface located opposite to the front surface, and an incident end surface located at one end of the front surface and the back surface. A light source that projects light toward the incident end face of the light plate, a flat portion along the surface of the light guide plate, and the incident end face that extends in a direction parallel to the incident end face of the light guide plate; A light-deflecting plate having a triangular prism-shaped prism surface arranged in a direction orthogonal to the light-guiding plate, and for deflecting light emitted from the surface of the light guide plate in a predetermined direction when superimposed on the surface of the light guide plate. The light guide plate has a plurality of convex portions on the front surface portion, which have light-collecting properties and direction controllability, and emit light reflected on the rear surface portion from the front surface portion. These projections project perpendicularly to the surface A flat illuminating device, characterized in that the contour shape is a triangle, one side of which is set substantially parallel to the incident end face, and the one side is located closer to the incident end face than the apex thereof.
形状が三角形をなし、その一辺が前記入射端面部とほぼ
平行に設定されると共に当該一辺がこれに対する頂点よ
りも前記入射端面部と反対側に位置する第２の凸部を前
記表面部に複数形成したことを特徴とする請求項７に記
載の平面照明装置。8. A contour projected perpendicular to the surface portion forms a triangle, one side of which is set substantially parallel to the incident end face portion, and one side of which is closer to the incident end face portion than a vertex to the incident end face portion. The flat lighting device according to claim 7, wherein a plurality of second convex portions located on the opposite side are formed on the surface portion.
は、前記表面部に対して傾斜し、かつ前記一辺を含む錐
面と、前記表面部に対してほぼ垂直な一対の錐面とから
なる三角錐であることを特徴とする請求項７または請求
項８に記載の平面照明装置。9. The first convex portion and the second convex portion are inclined with respect to the surface portion and have a cone surface including the one side and a pair of cones substantially perpendicular to the surface portion. The flat lighting device according to claim 7, wherein the flat lighting device is a triangular pyramid including a surface.
は、それぞれ三角柱状をなすことを特徴とする請求項７
または請求項８に記載の平面照明装置。10. The device according to claim 7, wherein each of the first and second convex portions has a triangular prism shape.
Alternatively, the planar lighting device according to claim 8.
は、前記一辺を共有して一体的に形成されていることを
特徴とする請求項７から請求項１０の何れかに記載の平
面照明装置。11. The device according to claim 7, wherein the first convex portion and the second convex portion are integrally formed by sharing the one side. A flat lighting device as described in the above.
面部と平行な方向に配列すると共に前記入射端面部と直
交する方向に延びる三角柱状のプリズム面が形成されて
いることを特徴とする請求項７から請求項１１の何れか
に記載の平面照明装置。12. A triangular prism surface arranged in a direction parallel to the incident end face and extending in a direction perpendicular to the incident end face is formed on a back surface of the light guide plate. The flat lighting device according to any one of claims 7 to 11, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22052497A JP3875362B2 (en) | 1996-08-27 | 1997-08-15 | Light guide plate and flat illumination device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22562396 | 1996-08-27 | ||
| JP8-225623 | 1996-08-27 | ||
| JP22052497A JP3875362B2 (en) | 1996-08-27 | 1997-08-15 | Light guide plate and flat illumination device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10123517A true JPH10123517A (en) | 1998-05-15 |
| JP3875362B2 JP3875362B2 (en) | 2007-01-31 |
Family
ID=26523757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22052497A Expired - Fee Related JP3875362B2 (en) | 1996-08-27 | 1997-08-15 | Light guide plate and flat illumination device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3875362B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000011722A (en) * | 1998-06-19 | 2000-01-14 | Nippon Denyo | Plane lighting system |
| US6402335B1 (en) | 1999-09-13 | 2002-06-11 | Nippon Leiz Corporation | Light guide panel and plane illuminator apparatus |
| KR100430427B1 (en) * | 2001-09-05 | 2004-05-04 | 주식회사 흥진메텍 | Method of Generating Patterns for Light Guide Panels, and Light Guide Panels Having Such Patterns |
| KR100469101B1 (en) * | 2002-04-17 | 2005-01-29 | 주식회사 엘 앤 에프 | The light guide plate for the back light, and the pattern design method thereof |
| JP2006267783A (en) * | 2005-03-25 | 2006-10-05 | Sanyo Epson Imaging Devices Corp | Electro-optic device, lighting system and electronic device |
| JP2008268982A (en) * | 2008-07-30 | 2008-11-06 | Nippon Leiz Co Ltd | Light guide plate and planar lighting device |
| JP2010056095A (en) * | 1999-02-23 | 2010-03-11 | Solid State Opto Ltd | Light-emitting panel assembly |
| JP5244980B2 (en) * | 2009-09-16 | 2013-07-24 | 株式会社東芝 | Semiconductor light emitting device |
-
1997
- 1997-08-15 JP JP22052497A patent/JP3875362B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000011722A (en) * | 1998-06-19 | 2000-01-14 | Nippon Denyo | Plane lighting system |
| JP2010056095A (en) * | 1999-02-23 | 2010-03-11 | Solid State Opto Ltd | Light-emitting panel assembly |
| US6402335B1 (en) | 1999-09-13 | 2002-06-11 | Nippon Leiz Corporation | Light guide panel and plane illuminator apparatus |
| KR100430427B1 (en) * | 2001-09-05 | 2004-05-04 | 주식회사 흥진메텍 | Method of Generating Patterns for Light Guide Panels, and Light Guide Panels Having Such Patterns |
| KR100469101B1 (en) * | 2002-04-17 | 2005-01-29 | 주식회사 엘 앤 에프 | The light guide plate for the back light, and the pattern design method thereof |
| JP2006267783A (en) * | 2005-03-25 | 2006-10-05 | Sanyo Epson Imaging Devices Corp | Electro-optic device, lighting system and electronic device |
| JP4645256B2 (en) * | 2005-03-25 | 2011-03-09 | ソニー株式会社 | Electro-optical device and electronic apparatus |
| JP2008268982A (en) * | 2008-07-30 | 2008-11-06 | Nippon Leiz Co Ltd | Light guide plate and planar lighting device |
| JP5244980B2 (en) * | 2009-09-16 | 2013-07-24 | 株式会社東芝 | Semiconductor light emitting device |
| US8643044B2 (en) | 2009-09-16 | 2014-02-04 | Kabushiki Kaisha Toshiba | Semiconductor light emitting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3875362B2 (en) | 2007-01-31 |
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