JP3820159B2 - Daylighting board - Google Patents
Daylighting board Download PDFInfo
- Publication number
- JP3820159B2 JP3820159B2 JP2002012434A JP2002012434A JP3820159B2 JP 3820159 B2 JP3820159 B2 JP 3820159B2 JP 2002012434 A JP2002012434 A JP 2002012434A JP 2002012434 A JP2002012434 A JP 2002012434A JP 3820159 B2 JP3820159 B2 JP 3820159B2
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- JP
- Japan
- Prior art keywords
- light
- light emitting
- light source
- illumination
- 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.)
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- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Description
【0001】
【発明の属する技術分野】
この発明はLCD(液晶ディスプレイ)やパネルの照光面等を照光するための採光板に係わり、特に、省スペース化され、しかも照光部分を均一に照明することができる採光板に関する。
【0002】
【従来の技術】
従来のLCD(液晶ディスプレイ)やパネルの照光面等を照光する採光板の例を図3に示す。図に示す採光板8の両側面に光源となるLED6、6が配置されている。なお図示していないが、採光板8の下面および両側面には反射板が配置され、上面には散光板が配置され、その上にLCD(液晶ディスプレイ)やパネルの照光面が配置される。LED6、6から出射された光は採光板や反射板で散光板に導かれ、散光板で拡散されて照光面を照明する。
【0003】
特開平6−123810号公報に提案された採光板は採光板の一方の側に光源を配置し、採光板の底面に複数の凹溝条を設けており、この凹溝条は光源に近くなるにつれて浅くなるように形成されている。
【0004】
特開平10−39302号公報に提案された採光板は採光板の一方の側または両側に光源を配置し、採光板の底面に複数の凹溝条を設けており、この凹溝条の傾斜角を光源からの距離により変化させている。
【0005】
特開平10−254371号公報に提案された採光板は採光板の一方の側に光源を配置し、採光板の底面を傾斜させて光源から遠くなるにつれて採光板の肉厚が薄くなるように変化させ、採光板の光放射面の上に断面鋸歯状のプリズムシートを配置している。
【0006】
【発明が解決しようとする課題】
上記した従来の両側面に光源を配置した採光板は部品点数が多くなる上に光源と採光板とが占めるスペースが大きくなり、設計上の自由度が小さくなる。また、照光するLCDの大きさが制限されるという問題があった。
【0007】
採光板の一方の側に光源を配置するものは、光を均一に拡散するために種々の技法が用いられているが、採光板の光放射面には光源方向からのみ光が導かれるために光源に近い所から遠い所に亘り均一に照光面を照射することが困難であった。
【0008】
この発明は上記した点に鑑みてなされたものであって、その目的とするところは、採光板の一方の側に光源を配置し、しかも、容易に光源に近い所から遠い所に亘り均一に照光面を照射することができる採光板を提供することにある。
【0009】
【課題を解決するための手段】
この発明の採光板は、照光面に対向配置される略長方形の板状の導光体の1方の側面に光源を配置し、他方の側面に前記導光体の底面に対して鈍角をなす下側反射面と前記底面に対して鋭角をなす上側反射面を形成すると共に、前記照光面と対向する前記導光体の光放射面を前記光源の側から前記下側反射面および上側反射面の側に向けて前記照光面と反対方向に下がるように形成して前記1方の側面と平行に伸びる複数のV字形溝を設け、前記光放射面の下がりきった位置から前記底面に対して垂直に立上がる光出射面を設け、前記光源から前記導光体を通り直接前記光放射面の内面に至った光を前記光放射面で前記照光面に向けて屈折させ、前記光源から前記導光体の下方を通り前記下側反射面で内部反射され、さらに前記上側反射面で内部反射されて前記光出射面の内部に至った光を前記光出射面から出射させて前記光放射面の外面に至った光を前記光放射面で前記照光面に向けて反射させるように構成したものである。
【0010】
また、前記採光板において、前記1方の側面に凹みを設け、前記凹みに突入するように光源が配置されるものである。
【0011】
また、前記各採光板において、前記光源としてLEDが用いられるものである。
【0012】
【発明の実施の形態】
この発明の実施例である採光板例を図面に基づいて説明する。図1はこの発明の実施例である採光板を示す平面図であり、図2は図1におけるA−A断面図である。図において、略長方形の板状導光体で作られた採光板1は一方の側面に凹み5が設けられており、凹み5に光源となるLED6が配置される。採光板1の他方の側面には45°に傾斜した反射面4、4が上下に形成されている。
【0013】
採光板1の底面は平面状に形成され、上面に光源から離れるに従って低くなる光放射面2が形成されている。光放射面2には、長手方向に対して直角方向に延びるV字形溝3、3…が形成されている。V字形溝3、3…は図1および図2の全体図では一部のみを簡略化して示しているが、A部拡大図に示す形状のものが光放射面2全体に形成されている。
【0014】
LED6から採光板1の内部を通り直接光放射面2の内面に至った光は光放射面2で屈折され矢印で示すようにLCDや表示板等の照光面7に向けて放射される。LED6から採光板1の内部の下方を通り反射面4に至った光は反射面4、4で反射され矢印で示すように光放射面2の外面に至った光は光放射面2で反射されて照光面7に向けて放射される。
【0015】
V字形溝3、3…は光放射面2で屈折または反射される光を拡散させて光むらをなくす。LED6を配置する部分に凹み5が設けられているために、いわゆる点光源であっても照光面7を幅方向に均一に照明することができる。
【0016】
光放射面2には光源側および光源と反対側の両方向から光が導かれるので照光面7を長手方向に対して均一に照明することができる。
【0017】
実施例は以上のように構成されているが発明はこれに限られず、例えば、光源としてLEDの代わりにランプを用いることも可能である。また、実施例では図示していなかったが、採光板1の底面および側面に反射板を配置してもよい。
【0018】
【発明の効果】
この発明の採光板によれば、部品点数が削減され、製造コストが安くなり、しかも、照光面を均一に照明することができる。
【0019】
また、光源と採光板とが占めるスペースが小さくなり、照明するLCD等を大きくすることができる。
【図面の簡単な説明】
【図1】この発明の実施例である採光板を示す平面図である。
【図2】図1におけるA−A断面図である。
【図3】従来の採光板の例を示す平面図である。
【符号の説明】
1 採光板
2 光放射面
3 V字形溝
4 反射面
5 凹み
6 LED
7 照光面
8 採光板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting plate for illuminating an illumination surface of an LCD (liquid crystal display) or a panel, and more particularly to a lighting plate that is space-saving and that can uniformly illuminate an illuminated portion.
[0002]
[Prior art]
FIG. 3 shows an example of a daylighting plate that illuminates a conventional LCD (liquid crystal display), an illumination surface of a panel, and the like.
[0003]
The daylighting plate proposed in Japanese Patent Laid-Open No. 6-123810 has a light source disposed on one side of the daylighting plate, and a plurality of grooves are provided on the bottom surface of the daylighting plate, and these grooves are close to the light source. It is formed so as to become shallower.
[0004]
In the daylighting plate proposed in Japanese Patent Laid-Open No. 10-39302, a light source is arranged on one side or both sides of the daylighting plate, and a plurality of grooves are provided on the bottom surface of the daylighting plate. Is changed according to the distance from the light source.
[0005]
The daylighting plate proposed in Japanese Patent Application Laid-Open No. 10-254371 has a light source disposed on one side of the daylighting plate, and the bottom surface of the daylighting plate is inclined so that the thickness of the daylighting plate decreases as the distance from the light source increases. A prism sheet having a sawtooth cross section is arranged on the light emitting surface of the daylighting plate.
[0006]
[Problems to be solved by the invention]
The above-described conventional daylighting plate in which light sources are arranged on both side surfaces increases the number of components and increases the space occupied by the light source and the daylighting plate, thereby reducing the degree of freedom in design. In addition, there is a problem that the size of the illuminated LCD is limited.
[0007]
Various light sources are arranged on one side of the daylighting plate, and various techniques are used to diffuse the light uniformly. However, because light is guided only from the direction of the light source to the light emitting surface of the daylighting plate. It was difficult to irradiate the illumination surface uniformly from a place close to the light source to a place far away.
[0008]
The present invention has been made in view of the above points. The object of the present invention is to arrange a light source on one side of a daylighting plate, and easily and uniformly from a place close to the light source. An object of the present invention is to provide a daylighting plate capable of irradiating an illumination surface.
[0009]
[Means for Solving the Problems]
In the lighting plate according to the present invention, a light source is disposed on one side surface of a substantially rectangular plate-shaped light guide disposed to face the illumination surface, and an obtuse angle with respect to the bottom surface of the light guide is formed on the other side surface. An upper reflective surface that forms an acute angle with the lower reflective surface and the bottom surface is formed, and the light emitting surface of the light guide facing the illumination surface is changed from the light source side to the lower reflective surface and the upper reflective surface. A plurality of V-shaped grooves are formed so as to be lowered in the opposite direction to the illumination surface toward the side, and extend in parallel with the one side surface , and from the position where the light emission surface is completely lowered to the bottom surface A light emitting surface that rises vertically is provided, and light that has passed from the light source through the light guide directly to the inner surface of the light emitting surface is refracted by the light emitting surface toward the illumination surface, and is guided from the light source to the light guiding surface. It passes under the light body and is internally reflected by the lower reflective surface, and further by the upper reflective surface. The light that is partially reflected and reaches the inside of the light emitting surface is emitted from the light emitting surface, and the light that reaches the outer surface of the light emitting surface is reflected by the light emitting surface toward the illumination surface. It is a thing.
[0010]
Further, in the daylighting plate, a recess is provided on the one side surface, and a light source is disposed so as to enter the recess.
[0011]
In each of the daylighting plates, an LED is used as the light source.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An example of a daylighting plate which is an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a daylighting plate according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. In the figure, a daylighting plate 1 made of a substantially rectangular plate-shaped light guide is provided with a recess 5 on one side surface, and an
[0013]
The bottom surface of the daylighting plate 1 is formed in a flat shape, and the
[0014]
Light that has passed through the inside of the lighting plate 1 from the
[0015]
The V-
[0016]
Since light is guided to the
[0017]
The embodiment is configured as described above, but the invention is not limited to this. For example, it is possible to use a lamp instead of an LED as a light source. Further, although not shown in the embodiment, a reflecting plate may be disposed on the bottom surface and the side surface of the daylighting plate 1.
[0018]
【The invention's effect】
According to the lighting plate of the present invention, the number of parts is reduced, the manufacturing cost is reduced, and the illumination surface can be illuminated uniformly.
[0019]
In addition, the space occupied by the light source and the daylighting plate is reduced, and the illuminated LCD or the like can be enlarged.
[Brief description of the drawings]
FIG. 1 is a plan view showing a daylighting plate according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a plan view showing an example of a conventional daylighting plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1
7
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002012434A JP3820159B2 (en) | 2002-01-22 | 2002-01-22 | Daylighting board |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002012434A JP3820159B2 (en) | 2002-01-22 | 2002-01-22 | Daylighting board |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2003215347A JP2003215347A (en) | 2003-07-30 |
JP3820159B2 true JP3820159B2 (en) | 2006-09-13 |
Family
ID=27649643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002012434A Expired - Fee Related JP3820159B2 (en) | 2002-01-22 | 2002-01-22 | Daylighting board |
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JP (1) | JP3820159B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011021738A1 (en) * | 2009-08-21 | 2011-02-24 | 단비기술 유한회사 | Backlight device |
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2002
- 2002-01-22 JP JP2002012434A patent/JP3820159B2/en not_active Expired - Fee Related
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JP2003215347A (en) | 2003-07-30 |
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