JP2554180Y2 - Surface light source device - Google Patents
Surface light source deviceInfo
- Publication number
- JP2554180Y2 JP2554180Y2 JP1990081739U JP8173990U JP2554180Y2 JP 2554180 Y2 JP2554180 Y2 JP 2554180Y2 JP 1990081739 U JP1990081739 U JP 1990081739U JP 8173990 U JP8173990 U JP 8173990U JP 2554180 Y2 JP2554180 Y2 JP 2554180Y2
- Authority
- JP
- Japan
- Prior art keywords
- light source
- area
- light guide
- pattern
- face
- 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.)
- Expired - Lifetime
Links
Landscapes
- Illuminated Signs And Luminous Advertising (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【考案の詳細な説明】 ［産業上の利用分野］ 本考案は、液晶装置のバックライト等に利用される導
光体を用いた面光源装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a surface light source device using a light guide used for a backlight or the like of a liquid crystal device.
［従来の技術］ 従来の導光体を用いた面光源装置は、第４図，第５図
に示すように冷陰極管等の直線状の光源１と、この光源
１に入射端面2aを近接配置した透明体よりなる導光体２
と、導光体２の表面に配置した拡散板３と、導光体２の
裏面に形成した反射面４とよりなり、そして光源１から
の光は、入射端面2aより導光体２内へ入り、上下の面で
順次反射されながら入射端面2a側からそれとは反対へ向
かって伝達されて行く。このように導光体２内を伝達さ
れて行く光の一部は、導光体２の表面より外に出、拡散
板３を通って拡散光となる。この拡散板３よりの拡散光
は、入射端面2a近くで明るく入射端面2aより遠ざかる程
輝度が減少し暗くなる。その欠点を除去するために第５
図に示すような入射端面2a付近が面積において疎で入射
端面2aから遠くなるにつれ密になるパターンを導光体２
に乳白色の印刷を施す等の方法によって、拡散板３より
の拡散光の輝度が一様になるようにしている。[Prior Art] In a conventional surface light source device using a light guide, as shown in FIGS. 4 and 5, a linear light source 1 such as a cold-cathode tube and an incident end face 2a are brought close to the light source 1. Light guide 2 composed of a transparent body arranged
And a diffusion plate 3 disposed on the surface of the light guide 2 and a reflection surface 4 formed on the back surface of the light guide 2. Light from the light source 1 enters the light guide 2 from the incident end face 2 a. The light enters and is transmitted from the incident end face 2a side in the opposite direction while being sequentially reflected by the upper and lower surfaces. A part of the light transmitted in the light guide 2 in this manner exits from the surface of the light guide 2 and passes through the diffusion plate 3 to become diffused light. The diffused light from the diffuser plate 3 is bright near the incident end face 2a and decreases in brightness and becomes darker as the distance from the incident end face 2a increases. Fifth to eliminate the disadvantage
As shown in the figure, a pattern near the incident end face 2a is sparse in area and becomes denser as the distance from the incident end face 2a increases.
The brightness of the diffused light from the diffuser plate 3 is made uniform by a method such as milky white printing.
［考案が解決しようとする課題］ 以上述べたような面光源装置は、スペースの制約上拡
散板３の発光面の寸法（入射端面2aの長さ）と光源１の
全長を同じにしなければならないことがある。このよう
な場合、光源１の両端の電極部分1aの影響により、入射
端面2aの両端に近いところ（第５図に符号Ｅにて示す付
近）の輝度が低下するという欠点があった。[Problem to be Solved by the Invention] In the surface light source device described above, the size of the light emitting surface of the diffusion plate 3 (the length of the incident end face 2a) and the total length of the light source 1 must be the same due to space restrictions. Sometimes. In such a case, due to the influence of the electrode portions 1a at both ends of the light source 1, there is a disadvantage that the luminance near the both ends of the incident end face 2a (near the reference numeral E in FIG. 5) is reduced.
本考案の目的は、上記の部分を含めて拡散板面全体が
均一の輝度になるようにした面光源装置を提供すること
にある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a surface light source device in which the entire surface of a diffusion plate including the above-described portion has uniform luminance.
［課題を解決するための手段］ 本考案の面光源装置は、両端に電極部を有する冷陰極
管等の線状の光源と、入射端面を光源に近接配置した導
光体と、導光体の表面に配置した拡散板と、前記導光体
の裏面に設けた反射面とよりなり、導光体の入射端面の
長さを光源の全体の長さとほぼ等しくすると共に、導光
体の裏面に、この裏面の全領域で、光源の長手方向に平
行な方向では中央部が面積の比率が最も低く、両端部に
向けて面積の比率が高くなり、更にこの裏面の全領域
で、入射端面側から入射端面と反対側の端面へと向かう
に従って面積の比率が高くなる状態となるように、乳白
色の印刷パターンのような拡散作用を有するパターンを
設けたものである。[Means for Solving the Problems] The surface light source device of the present invention comprises a linear light source such as a cold cathode tube having electrodes at both ends, a light guide having an incident end face arranged close to the light source, and a light guide. And a reflecting surface provided on the back surface of the light guide, the length of the incident end face of the light guide being substantially equal to the entire length of the light source, and the back surface of the light guide. In the entire region of the back surface, the central portion has the lowest area ratio in the direction parallel to the longitudinal direction of the light source, and the area ratio increases toward both end portions. A pattern having a diffusing effect, such as a milky white print pattern, is provided so that the area ratio increases from the side toward the end face opposite to the incident end face.
本考案の照明装置は、導光体の裏面に設けられた拡散
作用を有するパターンを前記のようにすることによっ
て、前述のような従来の照明装置においては、入射端面
から遠くなるにつれ輝度が落ちしかも光源の長手方向に
対し平行な方向において、入射端面側から入射端面と対
向する面側までの範囲で、中央付近と両端付近とで輝度
差が生じるのを、前記のような構成のパターンを設ける
ことによって導光体側の射出側の面つまり拡散板上の面
の輝度が均一になるようにした。In the lighting device of the present invention, the pattern having a diffusing action provided on the back surface of the light guide is formed as described above, so that in the above-described conventional lighting device, the luminance decreases as the distance from the incident end surface decreases. In addition, in the direction parallel to the longitudinal direction of the light source, in the range from the incident end surface to the surface facing the incident end surface, a difference in luminance between the vicinity of the center and the vicinity of both ends is caused by the above-described pattern. With this arrangement, the luminance of the light-emitting surface on the light guide side, that is, the surface on the diffusion plate was made uniform.
本考案の照明装置で用いる拡散作用を有するパターン
は、面積が徐々に変化してゆく拡散作用を有する多数の
小領域を均一な間隔で配置することによって面積の比率
を変化させたものである。又、面積が均一である拡散作
用を有する多数の小領域を、相互間の間隔を徐々に変え
て配置することで、拡散作用を有するパターンの面積の
比率を変化させるようにしてもよい。The pattern having a diffusion effect used in the illumination device of the present invention is obtained by changing the ratio of the area by arranging a large number of small regions having a diffusion effect whose area gradually changes at uniform intervals. Alternatively, the ratio of the area of the pattern having the diffusion effect may be changed by arranging a large number of small regions having the diffusion effect, each having a uniform area, while gradually changing the interval between them.
［実施例］ 次に本考案の面光源装置の一実施例を図面にもとづい
て説明する。Next, an embodiment of the surface light source device of the present invention will be described with reference to the drawings.
第１図，第２図は、本考案の第１の実施例を示すもの
で、第１図は断面図，第２図は導光体の裏面に設けられ
るパターンを示している。1 and 2 show a first embodiment of the present invention. FIG. 1 is a sectional view, and FIG. 2 shows a pattern provided on the back surface of a light guide.
この実施例は、直線状の光源１と、導光体２と、拡散
板３と、反射面４とより構成されている。又導光体２に
は第２図のような乳白色の印刷パターンのような拡散作
用を有するパターン５が設けられている。つまり導光体
２の入射端面2a側の中央部分である第２図に符号Ａにて
示す部分の斑点状の拡散部分５が面積が最も小でそれか
ら両側の符号Ｂにて示す部分にむけて面積が次第に大に
なっている。又Ａの部分から符号Ｃにて示す部分に向け
ても面積が次第に大になっている。更にＣの部分から符
号Ｄにて示す両側に向けても次第に面積が大になってい
る。つまり入射端面2a側の中央部分であるＡの部分が斑
点の面積が最も小でそれから離れるにつれていずれの方
向に向かっても次第に面積が大になり、Ｄの部分が最も
大である。This embodiment includes a linear light source 1, a light guide 2, a diffusion plate 3, and a reflection surface 4. The light guide 2 is provided with a pattern 5 having a diffusing action, such as a milky white print pattern as shown in FIG. In other words, the spot-shaped diffused portion 5 of the portion indicated by reference numeral A in FIG. 2, which is the central portion on the side of the incident end face 2a of the light guide 2, has the smallest area, and then to the portions indicated by reference numeral B on both sides. The area is gradually increasing. Also, the area is gradually increased from the portion A to the portion indicated by the reference numeral C. Further, the area gradually increases from part C to both sides indicated by reference numeral D. That is, the area of the spot A, which is the central part on the side of the incident end face 2a, has the smallest area of the spot, and the area gradually increases in any direction as the spot becomes farther from the spot, and the spot of the spot D is the largest.
上述のようにこの実施例で用いられるパターンは、入
射端面2aの側でその中央部分であるＡの部分では、拡散
作用を有する領域の面積の比率が最も低く、これから離
れるにつれて面積の比率が高くなるように構成されてい
る。そしてＡより最も離れているＤの部分が最も面積の
比率が高くなっている。As described above, in the pattern used in this embodiment, the area ratio of the region having the diffusion action is the lowest at the central portion A on the side of the incident end face 2a, and the area ratio increases as the distance from the area increases. It is configured to be. The portion D farthest from A has the highest area ratio.
このようなパターンを有する実施例１においては、入
射光量が大であるＡの部分においては、パターンによる
拡散光の量が少ないために逆に全反射による光の伝達が
大になり、光の射出が抑制されると共にそれより離れる
につれパターンによる拡散作用が増大し射出する光の量
が増大しこれによって拡散板３を通る光量が均一化され
均一の輝度分布になる。In Example 1 having such a pattern, in the portion A where the amount of incident light is large, the amount of diffused light due to the pattern is small, so that the transmission of light by total reflection is large, and Is suppressed, and as the distance increases, the diffusion effect of the pattern increases, and the amount of emitted light increases. As a result, the amount of light passing through the diffusion plate 3 becomes uniform, resulting in a uniform luminance distribution.
第３図は、本考案の第２の実施例の導光体２の裏面に
設けられたパターンを示す図である。この第２の実施例
は、同一面積の斑点状の拡散作用を有する部分を設けた
もので各斑点相互間の間隔がＡの部分にて大でＢの方向
へ向かうにつれまたＡからＣ方向へ向かうにつれ小にな
るようにしてある。以上のようにして、Ａの部分が拡散
作用をする領域の面積の比率が最も低く、これから離れ
るにつれて次第に面積の比率が高くなるようにパターン
を形成したものである。FIG. 3 is a view showing a pattern provided on the back surface of the light guide 2 according to the second embodiment of the present invention. In the second embodiment, a spot-like diffusing portion having the same area is provided, and the interval between the spots is large at the portion A and the direction from the direction A to the direction C increases. It's going to be smaller as you go. As described above, the pattern is formed such that the ratio of the area of the region where the portion A performs the diffusion action is the lowest, and as the distance from the region increases, the ratio of the area gradually increases.
この第２の実施例も、導光体２に設けるパターンを第
３図に示すような構成にし、第１の実施例と同様の作用
を有するもので、これによって均一な輝度分布になし得
た照明装置である。In the second embodiment, the pattern provided on the light guide 2 is configured as shown in FIG. 3 and has the same operation as the first embodiment, whereby a uniform luminance distribution can be obtained. It is a lighting device.
［考案の効果］ 本考案の面光源装置は、光源の長さ（電極部を含め）
と導光体の入射端面の長さとがほぼ同じ長さなので、発
光面の面積に比較して小型の装置となり、しかも発光面
全域にわたって均一な輝度になし得る。[Effect of the Invention] The surface light source device of the present invention has a light source length (including an electrode portion).
And the length of the incident end face of the light guide are almost the same length, so that the device can be small compared to the area of the light emitting surface, and the brightness can be uniform over the entire light emitting surface.
第１図，第２図は本考案の第１の実施例を示す図，第３
図は第２の実施例のパターンを示す図、第４図，第５図
は従来の導光体を用いた面光源装置の図である。 １…光源、２…導光体、３…拡散板、４…反射板、５…
拡散作用を有するパターン1 and 2 show a first embodiment of the present invention.
The figure shows the pattern of the second embodiment, and FIGS. 4 and 5 are views of a surface light source device using a conventional light guide. DESCRIPTION OF SYMBOLS 1 ... Light source, 2 ... Light guide, 3 ... Diffusion plate, 4 ... Reflection plate, 5 ...
Diffusion pattern
Claims (3)
端面を前記光源に近接配置した導光体と、前記導光体の
表面に設けた拡散板と、前記導光体の裏面に設けた反射
面とよりなる面光源装置において、前記導光体の入射端
面の長さを前記光源全体の長さとほぼ等しくすると共
に、前記導光体の裏面に拡散作用を有するパターンを設
け、前記パターンが前記線状の光源とほぼ平行に並びか
つ面積の比率は、前記導光体の裏面の全領域で、前記光
源の長手方向に平行な方向では中央部が最も低く両端部
に向けて高くなり、更に、前記入射端面側から前記入射
端面と反対側の端面へと向かうに従って面積の比率が高
くなることを特徴とする面光源装置。1. A linear light source having electrode portions at both ends, a light guide having an incident end face disposed close to the light source, a diffusion plate provided on a surface of the light guide, and a back surface of the light guide. In the surface light source device comprising the reflection surface provided in the above, while making the length of the incident end face of the light guide substantially equal to the entire length of the light source, providing a pattern having a diffusing action on the back surface of the light guide, The pattern is arranged almost in parallel with the linear light source and the ratio of the area is the lowest in the direction parallel to the longitudinal direction of the light source in the entire region on the back surface of the light guide. The surface light source device is characterized in that the area ratio increases from the incident end face side to the end face opposite to the incident end face.
積が徐々に変化してゆく拡散作用を有する多数の小領域
を均一な間隔で配置することによって行わせたことを特
徴とする請求項１の面光源装置。2. The method according to claim 1, wherein the ratio of the area of the pattern is changed by arranging a large number of small regions having a diffusion action, the area of which gradually changes, at uniform intervals. 1. Surface light source device.
積が同一である拡散作用を有する小領域を相互間の間隔
を徐々に変えて配置することによって行わせたことを特
徴とする請求項１の面光源装置。3. The method according to claim 1, wherein the change of the ratio of the area of the pattern is performed by arranging small regions having the same diffusion area having the same diffusion function while gradually changing the interval between them. 1. Surface light source device.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990081739U JP2554180Y2 (en) | 1990-08-02 | 1990-08-02 | Surface light source device |
| US07/666,901 US5134549A (en) | 1990-06-19 | 1991-03-11 | Surface light source device |
| KR1019910003879A KR100225864B1 (en) | 1990-06-19 | 1991-03-11 | Plate optical source apparatus |
| EP91103713A EP0462361B1 (en) | 1990-06-19 | 1991-03-11 | Surface light source device |
| DE69120349T DE69120349T2 (en) | 1990-06-19 | 1991-03-11 | Device for a flat light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990081739U JP2554180Y2 (en) | 1990-08-02 | 1990-08-02 | Surface light source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0440268U JPH0440268U (en) | 1992-04-06 |
| JP2554180Y2 true JP2554180Y2 (en) | 1997-11-12 |
Family
ID=31627943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990081739U Expired - Lifetime JP2554180Y2 (en) | 1990-06-19 | 1990-08-02 | Surface light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2554180Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1068947A (en) * | 1996-08-27 | 1998-03-10 | Matsushita Electric Works Ltd | Edge light panel and its production |
| JP5851217B2 (en) * | 2011-11-25 | 2016-02-03 | シャープ株式会社 | LIGHT SOURCE MODULE, AND ELECTRONIC DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE INCLUDING THE SAME |
| JP5621015B1 (en) * | 2013-05-31 | 2014-11-05 | シャープ株式会社 | Light guide plate, illumination device, display device, and television receiver |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2573365B2 (en) * | 1989-08-30 | 1997-01-22 | 株式会社東芝 | Liquid crystal display |
| JP3051476U (en) * | 1997-12-17 | 1998-08-25 | 和人 丸山 | Pacemaker electromagnetic interference prevention clothing |
-
1990
- 1990-08-02 JP JP1990081739U patent/JP2554180Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0440268U (en) | 1992-04-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |