JPH06167616A - Light guide plate device - Google Patents
Light guide plate deviceInfo
- Publication number
- JPH06167616A JPH06167616A JP4318642A JP31864292A JPH06167616A JP H06167616 A JPH06167616 A JP H06167616A JP 4318642 A JP4318642 A JP 4318642A JP 31864292 A JP31864292 A JP 31864292A JP H06167616 A JPH06167616 A JP H06167616A
- Authority
- JP
- Japan
- Prior art keywords
- guide plate
- light
- light guide
- light source
- emitting surface
- 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.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶用バックライト、
広告などの看板用バックライト、照明器具などに使用さ
れる導光板装置に関する。The present invention relates to a liquid crystal backlight,
The present invention relates to a light guide plate device used for a backlight for signs such as advertisements and a lighting device.
【０００２】[0002]
【従来の技術】導光板装置には、図７に示すように、一
面が発光面１とされ他面が反射面２とされた導光板３を
備え、導光板３の両端面４外方に光源用ランプ５を設
け、導光板３が前期両端面４から光源用ランプ５間中央
に向けて徐々に肉薄になるように、導光板３の発光面１
を両端面４から光源用ランプ５間中央に向けて前下がり
に傾斜させ、光源用ランプ５の光を導光板３の両端面４
から入射して、発光面１側を発光させるようにしたもの
がある。この場合、端面４から導光板３に入射した光
は、直接又は反射面２で反射した後に、導光板３内で反
射を何回も繰り返すことなく、発光面１に到達し、光源
用ランプ５の光を発光面１から効率よく放出して、発光
面１側の発光輝度を高めることが出来る。2. Description of the Related Art A light guide plate device is provided with a light guide plate 3 having a light emitting surface 1 on one side and a reflecting surface 2 on the other side, as shown in FIG. A light source lamp 5 is provided, and the light emitting surface 1 of the light guide plate 3 is formed so that the light guide plate 3 gradually becomes thinner from both end surfaces 4 in the previous period toward the center between the light source lamps 5.
From both end surfaces 4 toward the center between the light source lamps 5 toward the center, and the light from the light source lamps 5 is guided to both end surfaces 4 of the light guide plate 3.
In some cases, the light is incident on the light emitting surface 1 side to emit light. In this case, the light that has entered the light guide plate 3 from the end surface 4 reaches the light emitting surface 1 without being repeatedly reflected in the light guide plate 3 either directly or after being reflected by the reflecting surface 2, and then reaches the light source lamp 5 The light can be efficiently emitted from the light emitting surface 1 to enhance the emission brightness on the light emitting surface 1 side.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の場合、
光源用ランプ５の両端部は中央側に比べて光量が劣るた
め、光源用ランプ５両端部の光が、導光板３の光源用ラ
ンプ５間中央部にまで届かず、図９に示すように発光面
１の光源用ランプ５間中央部の両端部が暗くなり、この
ため発光面１に輝度むらを生じ、均一な発光が得られな
いという問題があった。However, in the conventional case,
Since the light quantity at both ends of the light source lamp 5 is inferior to that at the center side, the light at both end portions of the light source lamp 5 does not reach the central portion between the light source lamps 5 of the light guide plate 3, as shown in FIG. Both ends of the central portion of the light emitting surface 1 between the light source lamps 5 become dark, which causes uneven brightness on the light emitting surface 1 and uniform light emission cannot be obtained.
【０００４】本発明は、上記問題点に鑑み、発光面の光
源用ランプ間中央部の両端部が暗くなるのを防止して、
発光面に均一な発光が得られるようにしたものである。In view of the above problems, the present invention prevents the both ends of the central portion between the light source lamps on the light emitting surface from becoming dark,
It is intended to obtain uniform light emission on the light emitting surface.
【０００５】[0005]
【課題を解決するための手段】この技術的課題を解決す
るための本発明の技術的手段は、一面が発光面１２とさ
れ他面が反射面１３とされた導光板１１を備え、導光板
１１の両端面２５外方に光源用ランプ２４が設けられ、
導光板１１が前記両端面２５から光源用ランプ２４間中
央に向けて徐々に肉薄になるように、導光板１１の発光
面１２が両端面２５から光源用ランプ２４間中央に向け
て前下がりに傾斜され、光源用ランプ２４の光を導光板
１１の両端面２５から入射させて、発光面１２側を発光
させるようにした導光板装置において、導光板１１が中
途部から光源用ランプ２４がない側の導光板１１の両端
面３１に向けて徐々に肉厚になるように、発光面１２の
光源用ランプ２４間中央側が、導光板１１中途部から導
光板１１両端面３１に向けて前上がりに傾斜されている
点にある。The technical means of the present invention for solving this technical problem comprises a light guide plate 11 having one surface as a light emitting surface 12 and the other surface as a reflecting surface 13. The light source lamp 24 is provided outside both end surfaces 25 of the 11,
The light emitting surface 12 of the light guide plate 11 moves downward from both end surfaces 25 toward the center between the light source lamps 24 so that the light guide plate 11 gradually becomes thinner from the both end surfaces 25 toward the center between the light source lamps 24. In the light guide plate device in which the light of the light source lamp 24 is inclined and is incident from both end surfaces 25 of the light guide plate 11 so that the light emitting surface 12 side emits light, the light guide plate 11 does not have the light source lamp 24 from the middle part. The center side of the light emitting surface 12 between the light source lamps 24 gradually rises from the middle part of the light guide plate 11 toward both end faces 31 of the light guide plate 11 so as to gradually become thicker toward both end faces 31 of the light guide plate 11 on the side. The point is that it is inclined to.
【０００６】[0006]
【作用】導光板１１が前記両端面２５から光源用ランプ
２４間中央に向けて徐々に肉薄になるように、導光板１
１の発光面１２が両端面２５から光源用ランプ２４間中
央に向けて前下がりに傾斜されているため、両端面２５
から導光板１１に入射した光は、直接又は反射面１３で
反射した後に、導光板１１内で反射を何回も繰り返すこ
となく、反射面１３に到達し、発効面１２から外部に放
出される。また、導光板１１が中途部から光源用ランプ
２４がない側の導光板１１両端面３１に向けて徐々に肉
厚になるように、発光面１２の光源用ランプ２４間中央
側が、導光板１１中途部から導光板１１両端面３１に向
けて前上がりに傾斜されているため、光源用ランプ２４
両端部の光が、途中で発光面１２から余り放出されずに
済んで、導光板１１の光源用ランプ２４間中央部にまで
到達し、また光源用ランプ２４中央側の光も発光面１２
の光源用ランプ２４間中央部の両端部に有効に届くよう
になり、図６に示すように発光面１２の光源用ランプ２
４間中央部の両端部も十分明るくなる。Function: The light guide plate 11 is gradually thinned from both end surfaces 25 toward the center between the light source lamps 24.
Since the light emitting surface 12 of No. 1 is inclined downward from both end surfaces 25 toward the center between the light source lamps 24, both end surfaces 25
The light that has entered the light guide plate 11 from the light reaches the reflection surface 13 without being repeatedly reflected in the light guide plate 11 directly or after being reflected by the reflection surface 13, and is emitted from the effect surface 12 to the outside. . In addition, the light guide plate 11 has a central portion between the light source lamps 24 on the light emitting surface 12 so that the light guide plate 11 gradually becomes thicker from the middle portion toward both end surfaces 31 of the light guide plate 11 on the side where the light source lamp 24 is not provided. The light source lamp 24 is inclined upward from the middle part toward both end faces 31 of the light guide plate 11.
The light at both ends is not emitted so much from the light emitting surface 12 on the way, reaches the central portion between the light source lamps 24 of the light guide plate 11, and the light on the central side of the light source lamp 24 also emits light.
The light source lamps 24 on the light emitting surface 12 can effectively reach both ends of the central portion between the light source lamps 24, as shown in FIG.
Both ends of the central part between 4 are also sufficiently bright.
【０００７】[0007]
【実施例】以下、本発明を図示の実施例に従って説明す
ると、図２及び図３において、１１はアクリル樹脂によ
り構成した長方板形状の導光板で、一面が発光面１２と
され他面が反射面１３とされている。導光板１１の発光
面１２に、例えばポリカーボネイトフィルムにより構成
した光拡散板１４が設けられている。導光板１１の反射
面１３に、例えばポリエチレンテレフタレートの白色フ
ィルムから成る反射板１５が設けられ、また導光板１１
の反射面１３にシリカ、酸化チタン等の拡散剤を混入し
たインクをドット印刷して成る乱反射部１６が設けられ
ている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIGS. 2 and 3, reference numeral 11 denotes a rectangular plate-shaped light guide plate made of acrylic resin, one surface of which serves as a light emitting surface 12 and the other surface thereof. It is the reflection surface 13. A light diffusing plate 14 made of, for example, a polycarbonate film is provided on the light emitting surface 12 of the light guide plate 11. On the reflection surface 13 of the light guide plate 11, a reflection plate 15 made of, for example, a white film of polyethylene terephthalate is provided.
An irregular reflection portion 16 formed by dot-printing an ink mixed with a diffusing agent such as silica or titanium oxide is provided on the reflection surface 13 of FIG.
【０００８】２４は一対の光源用ランプで、導光板１１
の両端面２５外方に配置され、光源用ランプ２４の光が
導光板１１の端面２５から導光板１１内に入射するよう
になっている。２９は遮光カバーで、例えばポリエチレ
ンフィルムの内面に銀蒸着フィルムを貼付けて成り、光
源用ランプ２４の光が外部にもれないように導光板１１
の端面２５外方で光源２４の外周を覆っている。遮光カ
バー２９の両端部は、導光板１１外端部に両面接着テー
プ等を介して接着されている。導光板１１の光源用ラン
プ２４のない側の両端面３１には外部に光が漏れないよ
うにエッジテープ３２が貼り付けられている。Reference numeral 24 denotes a pair of light source lamps, which is a light guide plate 11.
The light from the light source lamp 24 is arranged outside both end surfaces 25 of the light guide plate 11 and enters the light guide plate 11 from the end surface 25 of the light guide plate 11. Reference numeral 29 is a light-shielding cover, which is formed by sticking a silver vapor deposition film on the inner surface of a polyethylene film, for example, so that the light from the light source lamp 24 is not exposed to the outside.
The outer periphery of the light source 24 is covered by the outside of the end surface 25 of the. Both ends of the light shielding cover 29 are adhered to the outer end of the light guide plate 11 via double-sided adhesive tape or the like. Edge tapes 32 are attached to both end surfaces 31 of the light guide plate 11 on the side where the light source lamp 24 is not provided so that light does not leak to the outside.
【０００９】図１にも示すように、前記導光板１１の発
光面１２は、両端面２５から光源用ランプ２４間中央に
向けて前下がりに傾斜され、これにより導光板１１は両
端面２５から光源用ランプ２４間中央に向けて徐々に肉
薄になっている。又、発光面１２の光源用ランプ２４間
中央側は、中途部から光源用ランプ２４がない側の導光
板１１両端面３１に向けて前上がりに傾斜され、導光板
１１は中途部から光源用ランプ２４がない側の導光板１
１両端面３１に向けて徐々に肉厚になっている。導光板
１１の発光面１１には、ヘアーライン加工、シボ加工、
拡散剤入りインクによる印刷などが施され、発光面１１
に拡散、発光効果を持たせている。As shown in FIG. 1, the light emitting surface 12 of the light guide plate 11 is inclined forward and downward from both end surfaces 25 toward the center between the light source lamps 24, whereby the light guide plate 11 is separated from both end surfaces 25. The light source lamps 24 are gradually thinned toward the center. Further, the central side of the light emitting surface 12 between the light source lamps 24 is inclined forward and upward from both ends of the light guide plate 11 on the side where the light source lamp 24 is not provided, and the light guide plate 11 is used for the light source from the middle part. Light guide plate 1 on the side without the lamp 24
1 The thickness gradually increases toward both end faces 31. On the light emitting surface 11 of the light guide plate 11, hairline processing, grain processing,
Printing with ink containing a diffusing agent, etc.
Has the effect of diffusion and light emission.
【００１０】図４は他の実施例を示し、導光板１１の発
光面１２を、導光板１１外周部から中央部に向けて楕円
状の等高線を描きながら低くなるように、外周部から中
央部に向けて前下がりに傾斜させ、これにより導光板１
１が前記両端面２５から光源用ランプ２４間中央に向け
て徐々に肉薄になるように、導光板１１の発光面１２を
両端面２５から光源用ランプ２４間中央に向けて前下が
りに傾斜させるとともに、導光板１１が中途部から光源
用ランプ２４がない側の導光板１１両端面３１に向けて
徐々に肉厚になるように、発光面１２の光源用ランプ２
４間中央側を、導光板１１中途部から両端面３１に向け
て前上がりに傾斜させている。FIG. 4 shows another embodiment, in which the light emitting surface 12 of the light guide plate 11 is lowered while drawing an elliptical contour line from the outer peripheral portion of the light guide plate 11 toward the central portion so as to be lowered. The light guide plate 1 is inclined downward toward the front.
The light emitting surface 12 of the light guide plate 11 is inclined forward and downward from both end surfaces 25 toward the center between the light source lamps 24 so that 1 gradually becomes thinner from the both end surfaces 25 toward the center between the light source lamps 24. At the same time, the light source lamp 2 on the light emitting surface 12 is formed such that the light guide plate 11 gradually becomes thicker from the middle portion toward both end surfaces 31 of the light guide plate 11 on the side where the light source lamp 24 is not provided.
The center side between the four is inclined forward and upward from the middle part of the light guide plate 11 toward both end faces 31.
【００１１】次に、本発明の実施例と図７に示す従来例
との比較結果を説明する。なお、本発明と従来例との導
光板装置は、全体の厚み、大きさ、光源用ランプ２４の
個数及び光の強さが互いに同一であるものを比較する。
図５は、本発明の実施例における導光板装置の有効発光
面上の９点で測定した輝度を表示し、また図８は従来例
における同様の９点での測定した輝度を表示している。
これら図５及び図８に示すように本発明の実施例は従来
例のものに比べて、発光面全体に亘って輝度が均一にな
っており、本発明の場合有効発光面上の９点の輝度測定
平均値が２３２１cd/m2 であるのに対し、従来例の場合
２２５１cd/m2 であり、本発明の実施例のものは従来の
ものに比べて輝度がやや向上している。また、均斉度は
本発明の場合０．９２であるのにたいして、従来例の場
合０．８３であり、本発明の実施例のものは従来のもの
に比べて均斉度が大幅に向上している。Next, the result of comparison between the embodiment of the present invention and the conventional example shown in FIG. 7 will be described. The light guide plate devices of the present invention and the conventional example are compared with each other in that the overall thickness and size, the number of light source lamps 24, and the light intensity are the same.
FIG. 5 shows the luminance measured at 9 points on the effective light emitting surface of the light guide plate device in the embodiment of the present invention, and FIG. 8 shows the luminance measured at the same 9 points in the conventional example. .
As shown in FIGS. 5 and 8, the embodiment of the present invention has a uniform luminance over the entire light emitting surface as compared with the prior art example. In the case of the present invention, nine points on the effective light emitting surface are provided. luminance measurement average value whereas a 2321cd / m 2, the case 2251cd / m 2 in the conventional example, those of the examples of the present invention is luminance as compared with the conventional are slightly improved. Further, the uniformity is 0.92 in the case of the present invention, whereas it is 0.83 in the case of the conventional example, and that of the embodiment of the present invention is significantly improved as compared with the conventional one. .
【００１２】なお、前記実施例では、導光板１１の両端
面２５外方に光源用ランプ２４を一個ずつ設けている
が、これに代え、導光板１１の両端面２５外方に光源用
ランプ２４を複数個ずつ設けるようにしてもよい。In the above embodiment, the light source lamps 24 are provided outside the both end surfaces 25 of the light guide plate 11 one by one, but instead of this, the light source lamps 24 are provided outside the both end surfaces 25 of the light guide plate 11. You may make it provide several each.
【００１３】[0013]
【発明の効果】本発明によれば、導光板１１が中途部か
ら光源用ランプ２４がない側の導光板１１両端面３１に
向けて徐々に肉厚になるように、発光面１２の光源用ラ
ンプ２４間中央側が、導光板１１中途部から導光板１１
両端面３１に向けて前上がりに傾斜されているので、光
源用ランプ２４両端部の光が、途中で発光面１２から余
り放出されずに済んで、導光板１１の光源用ランプ２４
間中央部にまで到達し、また光源用ランプ２４中央側の
光も発光面１２の光源用ランプ２４間中央部の両端部に
有効に届くようになり、発光面１２の光源用ランプ２４
間中央部の両端部も十分明るくなり、このため発光面１
２の輝度むらを防止でき、より均一な発光を得ることが
できる。According to the present invention, the light guide plate 11 for the light source of the light emitting surface 12 is gradually thickened from the middle part toward both end faces 31 of the light guide plate 11 on the side where the light source lamp 24 is not provided. The center side between the lamps 24 is from the middle part of the light guide plate 11 to the light guide plate 11
Since the light source lamp 24 is inclined forward and upward toward both end faces 31, the light at both ends of the light source lamp 24 is not emitted so much from the light emitting surface 12 on the way, and the light source lamp 24 of the light guide plate 11 is prevented.
Light reaches the central portion of the light source lamp 24, and the light on the central side of the light source lamp 24 also effectively reaches both end portions of the central portion of the light source lamp 24 of the light emitting surface 12.
Both ends of the central area are also bright enough, so that the light emitting surface 1
It is possible to prevent the uneven brightness of 2 and obtain more uniform light emission.
【図１】本発明の一実施例を示す導光板の斜視図であ
る。FIG. 1 is a perspective view of a light guide plate showing an embodiment of the present invention.
【図２】本発明の一実施例を示す側断面図である。FIG. 2 is a side sectional view showing an embodiment of the present invention.
【図３】本発明の一実施例を示す正断面図である。FIG. 3 is a front sectional view showing an embodiment of the present invention.
【図４】他の実施例を示す導光板の斜視図である。FIG. 4 is a perspective view of a light guide plate showing another embodiment.
【図５】実施例品の輝度の測定結果を示す平面図であ
る。FIG. 5 is a plan view showing a measurement result of luminance of an example product.
【図６】図５に示す導光板のＡ─Ｂ─Ｃ線上の位置と輝
度との関係を示すグラフである。6 is a graph showing the relationship between the position on the line ABC and the brightness of the light guide plate shown in FIG.
【図７】従来例を示す側断面図である。FIG. 7 is a side sectional view showing a conventional example.
【図８】従来品の輝度の測定結果を示す平面図である。FIG. 8 is a plan view showing a measurement result of luminance of a conventional product.
【図９】図８に示す導光板のＡ─Ｂ─Ｃ線上の位置と輝
度との関係を示すグラフである。9 is a graph showing the relationship between the position on the line ABC and the brightness of the light guide plate shown in FIG.
１１ 導光板 １２ 発光面 １３ 反射面 ２４ 光源用ランプ ２５ 端面 ３１ 端面 11 Light guide plate 12 Light emitting surface 13 Reflective surface 24 Light source lamp 25 End surface 31 End surface
Claims (1)
面（１３）とされた導光板（１１）を備え、導光板（１
１）の両端面（２５）外方に光源用ランプ（２４）が設
けられ、導光板（１１）が前記両端面（２５）から光源
用ランプ（２４）間中央に向けて徐々に肉薄になるよう
に、導光板（１１）の発光面（１２）が両端面（２５）
から光源用ランプ（２４）間中央に向けて前下がりに傾
斜され、光源用ランプ（２４）の光を導光板（１１）の
両端面（２５）から入射させて、発光面（１２）側を発
光させるようにした導光板装置において、 導光板（１１）が中途部から光源用ランプ（２４）がな
い側の導光板（１１）の両端面（３１）に向けて徐々に
肉厚になるように、発光面（１２）の光源用ランプ（２
４）間中央側が、導光板（１１）中途部から導光板（１
１）両端面（３１）に向けて前上がりに傾斜されている
ことを特徴とする導光板装置。1. A light guide plate (11) having one surface as a light emitting surface (12) and the other surface as a reflecting surface (13).
A light source lamp (24) is provided outside both end faces (25) of (1), and the light guide plate (11) is gradually thinned from the both end faces (25) toward the center between the light source lamps (24). As described above, the light emitting surface (12) of the light guide plate (11) has both end surfaces (25).
From the light source lamp (24) toward the center, the light of the light source lamp (24) is made incident from both end surfaces (25) of the light guide plate (11), and the light emitting surface (12) side is set. In the light guide plate device that emits light, the light guide plate (11) gradually becomes thicker from the middle part toward both end faces (31) of the light guide plate (11) on the side where the light source lamp (24) is not provided. In addition, the light source lamp (2
4) the central side is from the middle of the light guide plate (11) to the light guide plate (1).
1) A light guide plate device, which is inclined forward and upward toward both end faces (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4318642A JPH06167616A (en) | 1992-11-27 | 1992-11-27 | Light guide plate device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4318642A JPH06167616A (en) | 1992-11-27 | 1992-11-27 | Light guide plate device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06167616A true JPH06167616A (en) | 1994-06-14 |
Family
ID=18101420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4318642A Pending JPH06167616A (en) | 1992-11-27 | 1992-11-27 | Light guide plate device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06167616A (en) |
-
1992
- 1992-11-27 JP JP4318642A patent/JPH06167616A/en active Pending
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