JPH064706U - Light guide plate device - Google Patents
Light guide plate deviceInfo
- Publication number
- JPH064706U JPH064706U JP4296092U JP4296092U JPH064706U JP H064706 U JPH064706 U JP H064706U JP 4296092 U JP4296092 U JP 4296092U JP 4296092 U JP4296092 U JP 4296092U JP H064706 U JPH064706 U JP H064706U
- Authority
- JP
- Japan
- Prior art keywords
- guide plate
- light guide
- light
- reflection
- plate
- 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
- Light Guides In General And Applications Therefor (AREA)
Abstract
(57)【要約】
【目的】 導光板の入光部付近が異状に明るくならない
ようにして、輝度ムラの発生を防止する。
【構成】 一面が発光面2 とされ他面が反射面3 とされ
る導光板1 を備え、導光板1 の側方に、導光板1 の側端
面10から光を入射させる光源9 が設けられ、導光板1 の
反射面3 側に、光を拡散させる反射板5 が設けられた導
光板装置において、前記導光板1 と反射板5 との間の光
源9 側端部に、乱反射抑制材17が設けられている。
(57) [Abstract] [Purpose] The occurrence of uneven brightness is prevented by preventing the area around the light entrance of the light guide plate from becoming abnormally bright. [Composition] A light guide plate 1 having one surface as a light emitting surface 2 and the other surface as a reflecting surface 3 is provided, and a light source 9 for allowing light to enter from a side end surface 10 of the light guide plate 1 is provided on the side of the light guide plate 1. In the light guide plate device in which the light guide plate 1 is provided with the reflection plate 5 on the reflection surface 3 side, the irregular reflection suppressing material 17 is provided at the end of the light guide 9 between the light guide plate 1 and the reflection plate 5. Is provided.
Description
【０００１】[0001]
本考案は、液晶用バックライト、広告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 light guide plate device used for a backlight for liquid crystal, a backlight for advertising billboard, a lighting fixture, and the like.
【０００２】[0002]
図11は従来の導光板装置を示し、31は透明アクリル板により構成した導光板で 、その一面は発光面32とされ、他面は反射面33とされている。導光板31の側方に 、導光板31の側端面から光を入射させる光源34が設けられると共に、光源34の外 周を取囲む反射カバー35が設けられている。導光板31の発光面32側に、光を拡散 させる拡散板36が設けられ、導光板31の反射面33にはキズやスクリーン印刷等の 加工を施して成る乱反射部37を散点状に設けると共に、ＰＥＴフィルム或いはこ れにアルミニウムを蒸着したテープ状の反射板38を貼付けている。 FIG. 11 shows a conventional light guide plate device, 31 is a light guide plate composed of a transparent acrylic plate, one surface of which is a light emitting surface 32 and the other surface is a reflecting surface 33. A light source 34 that allows light to enter from the side end surface of the light guide plate 31 is provided on the side of the light guide plate 31, and a reflection cover 35 that surrounds the outer circumference of the light source 34 is provided. A diffuser plate 36 for diffusing light is provided on the light emitting surface 32 side of the light guide plate 31, and irregular reflection portions 37 formed by performing processing such as scratches and screen printing are provided on the reflecting surface 33 of the light guide plate 31 in a scattered manner. At the same time, a PET film or a tape-shaped reflector 38 having aluminum vapor-deposited thereon is attached.
【０００３】[0003]
しかし、従来の場合反射板38の光源34近くでの光の乱反射が多く、その光が拡 散板36に導入されると、図１２に示すように特に導光板31の入光部付近が異常に 明るく（異常発光）なり、このため導光板1 の有効発光部に影響が及んで、輝度 ムラの原因となった。また、この輝度ムラを避けるため光源34から有効発光部ま での距離を大にする必要が生じ、導光板装置全体が大型化するという問題があっ た。 However, in the conventional case, there are many irregular reflections of light near the light source 34 of the reflector 38, and when the light is introduced into the diffuser 36, as shown in FIG. It became brighter (abnormal light emission), which affected the effective light emitting part of the light guide plate 1 and caused uneven brightness. Further, in order to avoid this uneven brightness, it is necessary to increase the distance from the light source 34 to the effective light emitting portion, which causes a problem that the entire light guide plate device becomes large.
【０００４】 本考案は、上記問題点に鑑み、導光板の入光部付近が異状に明るくならないよ うにして、輝度ムラの発生を防止したものである。In view of the above problems, the present invention prevents uneven brightness from occurring in the vicinity of the light entrance portion of the light guide plate so as not to be abnormally bright.
【０００５】[0005]
この技術的課題を解決するための本考案の技術的手段は、一面が発光面2 とさ れ他面が反射面3 とされる導光板1 を備え、導光板1 の側方に、導光板1 の側端 面10から光を入射させる光源9 が設けられ、導光板1 の反射面3 側に、光を反射 させる反射板5 が設けられた導光板装置において、 前記導光板1 と反射板5 との間の光源9 側端部に、乱反射抑制材17が設けられ ている点にある。 The technical means of the present invention for solving this technical problem is provided with a light guide plate 1 having one surface as a light emitting surface 2 and the other surface as a reflecting surface 3, and the light guide plate 1 is provided on the side of the light guide plate 1. In the light guide plate device, a light source 9 for allowing light to enter from the side end surface 10 of 1 is provided, and a reflector 5 for reflecting light is provided on the reflecting surface 3 side of the light guide plate 1. The diffused reflection suppressing material 17 is provided at the end of the light source 9 side between the light source 9 and the light source 5.
【０００６】[0006]
導光板1 の反射面3 の光源9 近くに入射した光は、乱反射抑制材17によって乱 反射が抑えられ、図８に示す如く導光板1 の入力部付近が異状発光しなくなる。 Diffuse reflection of the light incident on the reflection surface 3 of the light guide plate 1 near the light source 9 is suppressed by the irregular reflection suppressing material 17, and abnormal light emission does not occur near the input part of the light guide plate 1 as shown in FIG.
【０００７】[0007]
以下、本考案を図示の実施例に従って説明すると、図１において、1 は透明ア クリル板により構成した導光板で、その一面は発光面2 とされ、他面は反射面3 とされている。4 は導光板1 の反射面3 に散点状に設けた乱反射部で、反射面3 にキズやスクリーン印刷等の加工を施すことにより構されている。5 は反射板で 、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、導光板 1 の反射面3 に貼着されている。7 は拡散板で、例えばポリカーボネイトフィル ムにより構成され、導光板1 の発光面2 に貼着されている。 The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, 1 is a light guide plate composed of a transparent acrylic plate, one surface of which is a light emitting surface 2 and the other surface is a reflecting surface 3. Reference numeral 4 denotes a diffused reflection portion provided on the reflection surface 3 of the light guide plate 1 in a scattered manner, and is constructed by subjecting the reflection surface 3 to processing such as scratches and screen printing. Reference numeral 5 denotes a reflecting plate, which is formed, for example, by sticking a silver vapor deposition film on the inner surface of a polyethylene film, and is stuck on the reflecting surface 3 of the light guide plate 1. Reference numeral 7 denotes a diffuser plate, which is made of, for example, a polycarbonate film and is attached to the light emitting surface 2 of the light guide plate 1.
【０００８】 9 は光源で、冷陰極管ランプ等により構成され、導光板1 の側方に配置され、 光源9 の光が導光板1 の側端面10から導光板1 内に入射するようになっている。 11は反射カバーで、例えば塩化ビニルフィルムの内面に銀蒸着フィルムを貼付け て成り、光源9 の光が外部にもれないように導光板1 の一方の側端面10外方で光 源9 の外周を覆っている。反射カバー11の両端部12,13 は、導光板1 の発光面2 及び反射面3 の端部に夫々接着剤14を介して添設されている。Reference numeral 9 denotes a light source, which is composed of a cold cathode tube lamp or the like and is arranged on the side of the light guide plate 1 so that the light of the light source 9 enters the light guide plate 1 from the side end surface 10 of the light guide plate 1. ing. Reference numeral 11 denotes a reflection cover, which is formed by sticking a silver vapor deposition film on the inner surface of a vinyl chloride film, for example, so that the light from the light source 9 does not leak to the outside. Covers. Both ends 12 and 13 of the reflection cover 11 are attached to the ends of the light emitting surface 2 and the reflection surface 3 of the light guide plate 1 via adhesives 14, respectively.
【０００９】 図１及び図２において、17は導光板1 と反射板5 との間の光源9 側端部に設け た乱反射抑制材で、反射板5 の光源9 側端部の上面（導光板1 側）に黒色テープ （ＰＥＴフィルムなど）を貼り付け又は黒色インクを塗って成る。この乱反射抑 制材17は幅5 mm程度であって、導光板1 の全長に亘っている。 なお、この実施例では、光源9 を導光板1 の一側方のみに設け、導光板1 の一 側端面のみから光源9 の光を入射するようにしている。In FIGS. 1 and 2, reference numeral 17 denotes a diffuse reflection suppressing material provided at an end portion of the light guide plate 1 and the reflection plate 5 on the light source 9 side. Black tape (PET film, etc.) is attached or black ink is applied to the 1 side). The diffused reflection suppressing material 17 has a width of about 5 mm and extends over the entire length of the light guide plate 1. In this embodiment, the light source 9 is provided only on one side of the light guide plate 1, and the light from the light source 9 is incident only from one end face of the light guide plate 1.
【００１０】 図３は他の実施例を示し、光源9 を導光板1 の両側方に設け、導光板1 の両側 端面10から光源9 の光を導光板1 内に入射すると共に、反射板5 の光源9 側両端 部に夫々帯状の乱反射抑制材17を設けたものである。その他の点は前記実施例と 同様の構成である。 図４及び図５は他の実施例を示し、光源9 を導光板1 の両側方に設け、導光板 1 の両側端面10から光源9 の光を導光板1 内に入射すると共に、導光板1 の光源 9 側両端部に夫々帯状の乱反射抑制材17を設けたものである。この乱反射抑制材 17は導光板1 に黒色顔料を含むインクで帯状に印刷し、又は黒色インク（油性） を帯状に塗って成る。FIG. 3 shows another embodiment, in which the light sources 9 are provided on both sides of the light guide plate 1, light from the light sources 9 is incident on the light guide plate 1 from both end surfaces 10 of the light guide plate 1, and the reflection plate 5 is provided. Band-shaped diffuse reflection suppressing materials 17 are provided at both ends of the light source 9 side. The other points are the same as those of the above-mentioned embodiment. 4 and 5 show another embodiment, in which the light sources 9 are provided on both sides of the light guide plate 1, and the light of the light source 9 is incident on the light guide plate 1 from both side end faces 10 of the light guide plate 1 as well as the light guide plate 1. Band-shaped diffuse reflection suppressing materials 17 are provided at both ends of the light source 9 side. The diffuse reflection suppressing material 17 is formed by printing the light guide plate 1 in a band shape with an ink containing a black pigment, or applying a black ink (oil-based) in a band shape.
【００１１】 図６及び図７は夫々図４及び図５の実施例の変形例を示し、図６は、乱反射抑 制材17を導光板1 の光源9 側両端部に点状に設けたものであり、図７は乱反射抑 制材17を導光板1 の光源9 側両端部に２本ずつ線状に設けたものである。 次に、本考案の実施例と従来例との比較結果を説明する。図９は、本考案の実 施例（反射板入光部に黒色ＰＥＴテープを貼り付けたもの）における導光板装置 の有効発光面上の25点で測定した輝度（cd/ ｍ2) を表示し、図10は、従来にお ける導光板装置の有効発光面上の25点で測定した輝度（cd/ ｍ2) を表示してい る。これらからわかるように実施例品の場合異常発光がなくなり、しかも輝度値 の低下もほとんどない。FIGS. 6 and 7 show modifications of the embodiment of FIGS. 4 and 5, respectively, and FIG. 6 shows that the diffuse reflection suppressing material 17 is provided in a dot shape at both ends of the light guide plate 1 on the light source 9 side. In FIG. 7, two diffuse reflection suppressing materials 17 are linearly provided at both ends of the light guide plate 1 on the light source 9 side. Next, a comparison result between the embodiment of the present invention and the conventional example will be described. FIG. 9 shows the luminance (cd / m 2 ) measured at 25 points on the effective light emitting surface of the light guide plate device in the embodiment of the present invention (black PET tape attached to the light entrance part of the reflector plate). However, FIG. 10 shows the luminance (cd / m 2 ) measured at 25 points on the effective light emitting surface of the conventional light guide plate device. As can be seen from these, in the case of the example product, abnormal light emission disappears, and there is almost no decrease in the brightness value.
【００１２】[0012]
本考案によれば、導光板1 と反射板5 との間の光源9 側端部に、乱反射抑制材 17を設けたので、乱反射抑制材17によって光源9 の近くでの乱反射を抑制でき、 これにより導光板1 の入力部付近の異常発光をなくすことが可能になり、導光板 装置の輝ムラを効果的に抑えることができる。しかも、異常発光を避けるために 、導光板1 の入力部から有効発光部までの距離を大にする必要がなくなり、装置 全体をより小型化し得る。 According to the present invention, since the diffuse reflection suppressing material 17 is provided at the end of the light source 9 side between the light guide plate 1 and the reflecting plate 5, the diffuse reflection suppressing material 17 can suppress the diffuse reflection near the light source 9. This makes it possible to eliminate abnormal light emission in the vicinity of the input part of the light guide plate 1 and effectively suppress uneven brightness of the light guide plate device. Moreover, in order to avoid abnormal light emission, it is not necessary to increase the distance from the input section of the light guide plate 1 to the effective light emitting section, and the overall size of the device can be further reduced.
【図１】本考案の一実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】反射板の平面図である。FIG. 2 is a plan view of a reflection plate.
【図３】他の実施例を示す反射板の平面図である。FIG. 3 is a plan view of a reflector according to another embodiment.
【図４】他の実施例を示す断面図である。FIG. 4 is a sectional view showing another embodiment.
【図５】導光板の底面図である。FIG. 5 is a bottom view of the light guide plate.
【図６】他の実施例を示す導光板の底面図である。FIG. 6 is a bottom view of a light guide plate showing another embodiment.
【図７】他の実施例を示す導光板の底面図である。FIG. 7 is a bottom view of a light guide plate showing another embodiment.
【図８】導光板の輝度と光源からの距離との関係を示す
グラフである。FIG. 8 is a graph showing the relationship between the brightness of the light guide plate and the distance from the light source.
【図９】実施例品の輝度の測定結果を示す平面図であ
る。FIG. 9 is a plan view showing a measurement result of luminance of an example product.
【図１０】従来品の輝度の測定結果を示す平面図であ
る。FIG. 10 is a plan view showing a measurement result of luminance of a conventional product.
【図１１】従来例を示す断面図である。FIG. 11 is a cross-sectional view showing a conventional example.
【図１２】導光板の輝度と光源からの距離との関係を示
すグラフである。FIG. 12 is a graph showing the relationship between the brightness of the light guide plate and the distance from the light source.
１ 導光板 ２ 発光面 ３ 反射面 ５ 反射板 ９ 光源 10 側端面 17 乱反射抑制材 1 Light guide plate 2 Light emitting surface 3 Reflecting surface 5 Reflecting plate 9 Light source 10 side end surface 17 Diffuse reflection suppressing material
Claims (1)
される導光板1 を備え、導光板1 の側方に、導光板1 の
側端面10から光を入射させる光源9 が設けられ、導光板
1 の反射面3 側に、光を反射させる反射板5 が設けられ
た導光板装置において、 前記導光板1 と反射板5 との間の光源9 側端部に、乱反
射抑制材17が設けられていることを特徴とする導光板装
置。1. A light guide plate (1) having one surface as a light emitting surface (2) and the other surface as a reflecting surface (3), and a light source (9) for allowing light to enter from a side end surface (10) of the light guide plate (1) to the side of the light guide plate (1). Provided with a light guide plate
In a light guide plate device in which a reflection plate 5 for reflecting light is provided on the reflection surface 3 side of 1, a diffuse reflection suppressing material 17 is provided at the end of the light source 9 side between the light guide plate 1 and the reflection plate 5. A light guide plate device characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4296092U JPH064706U (en) | 1992-06-22 | 1992-06-22 | Light guide plate device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4296092U JPH064706U (en) | 1992-06-22 | 1992-06-22 | Light guide plate device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH064706U true JPH064706U (en) | 1994-01-21 |
Family
ID=12650602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4296092U Pending JPH064706U (en) | 1992-06-22 | 1992-06-22 | Light guide plate device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH064706U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100268644B1 (en) * | 1995-03-06 | 2000-10-16 | 야스나가 히데아키 | Lcd device |
| JP2009170386A (en) * | 2008-01-21 | 2009-07-30 | Fujikura Ltd | Planar light-emitting device |
-
1992
- 1992-06-22 JP JP4296092U patent/JPH064706U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100268644B1 (en) * | 1995-03-06 | 2000-10-16 | 야스나가 히데아키 | Lcd device |
| JP2009170386A (en) * | 2008-01-21 | 2009-07-30 | Fujikura Ltd | Planar light-emitting device |
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