JPH0476593A - Face light emission device - Google Patents
Face light emission deviceInfo
- Publication number
- JPH0476593A JPH0476593A JP2190109A JP19010990A JPH0476593A JP H0476593 A JPH0476593 A JP H0476593A JP 2190109 A JP2190109 A JP 2190109A JP 19010990 A JP19010990 A JP 19010990A JP H0476593 A JPH0476593 A JP H0476593A
- Authority
- JP
- Japan
- Prior art keywords
- light
- transparent
- guide plate
- plate
- scattering
- 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
- 238000000149 argon plasma sintering Methods 0.000 claims abstract description 24
- 229920000642 polymer Polymers 0.000 claims abstract description 11
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 abstract description 13
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000007650 screen-printing Methods 0.000 abstract description 2
- -1 acryl Chemical group 0.000 abstract 1
- 229910052738 indium Inorganic materials 0.000 abstract 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
Abstract
Description
に産業上の利用分野】
この発明は、導光方式にロスが少なく、高い輝度で発光
させることができるエツジライト型の面発光装置に関す
るものである。
ｒ従来の技術】
従来、透光性板の表面に液晶パネルを配置し、透光性板
の背面に光散乱物質を直接塗布するなどして施した後、
鏡面反射板を設置するようにした面発光装置がある（特
開平１−２４５２２０号参照）。
（発明が解決しようとする課題］
しかし、上記構造のものでは、光散乱物質が白インキな
どの光を吸収する物質であり、光の光散乱効率が低いと
いった問題がある。
したがって、この発明の目的は、上記のような問題を解
決することにあり、導光方式にロスが少なく、高い輝゛
度で発光させることができる面発光装置を提供すること
にある。TECHNICAL FIELD The present invention relates to an edge-light type surface emitting device that has a light guide method with little loss and can emit light with high brightness. rPrior Art Conventionally, after placing a liquid crystal panel on the surface of a translucent plate and applying a light-scattering substance directly to the back of the translucent plate,
There is a surface emitting device in which a specular reflector is installed (see Japanese Patent Laid-Open No. 1-245220). (Problems to be Solved by the Invention) However, in the structure described above, the light scattering substance is a substance that absorbs light, such as white ink, and there is a problem that the light scattering efficiency of light is low. The purpose is to solve the above-mentioned problems, and to provide a surface emitting device that has a light guide method with little loss and can emit light with high brightness.
上記の目的を達成するために、この発明は、透明導光板
の端面に光源が配置され、透明導光板の裏面に光拡散透
過部が形成され、さらにその上に光散乱反射板が重ねて
配置された面発光装置において、光拡散透過部が中空ポ
リマーを含むように構成したものである。
また、中空ポリマーが、直径０．１〜２０μｍのアクリ
ル系樹脂からなるものであるように構成することもでき
る。In order to achieve the above object, the present invention includes a light source disposed on the end face of a transparent light guide plate, a light diffusion transmitting part formed on the back surface of the transparent light guide plate, and a light scattering reflection plate superimposed thereon. In this surface emitting device, the light diffusing and transmitting portion includes a hollow polymer. Alternatively, the hollow polymer may be made of acrylic resin and have a diameter of 0.1 to 20 μm.
光源近傍では、光源より照射された光のうち大部分の光
が透明導光板内部で入射角と反射角とが等しく全反射を
繰り返し、透明導光板の中央付近へ導かれる一方、残り
の光が面積的には小さい光拡散透過部で光拡散して直接
的に、または光拡散透過部を透過し、透明導光板裏面の
光散乱反射板で反射して間接的に透明導光板表面側に導
かれる。
光拡散透過部にあたった光は中空ポリマ一部で一部は反
射し、残りは中空ポリマーの殻の部分で屈折しながら殻
内部に入る。その光は、殻の内部の中空部でさらに屈折
し、かつ殻内面で乱反射を繰り返し、屈折しながら殻外
側へ出ていく。
また、上記光源から遠い部分では、大部分の光が面積的
に大きい光拡散透過部で直接または間接的に表面側へ導
かれる一方、残りの光が透明導光板内部で入射角と反射
角とが等しく全反射を繰り返して透明導光板の側部付近
へ導かれる。
したがって、このようにして光源近傍の光量の強い部分
の光を上記光源から遠い部分の光量の弱い部分に導くこ
とができ、全体として光のロスが少なく非常に光輝度で
均一な面光源を形成することになる。Near the light source, most of the light emitted from the light source undergoes total internal reflection within the transparent light guide plate, where the incident angle and reflection angle are equal, and is guided to the center of the transparent light guide plate, while the remaining light is The light is diffused directly by the light diffusing and transmitting part, which is small in terms of area, or it is transmitted through the light diffusing and transmitting part, reflected by the light scattering and reflecting plate on the back of the transparent light guide plate, and indirectly guided to the front side of the transparent light guide plate. It will be destroyed. A portion of the light that hits the light diffusing and transmitting portion is reflected by a portion of the hollow polymer, and the rest enters the inside of the shell while being refracted by the hollow polymer shell. The light is further refracted in the hollow space inside the shell, repeatedly reflected diffusely on the inner surface of the shell, and then exits to the outside of the shell while being refracted. In addition, in the part far from the light source, most of the light is guided directly or indirectly to the surface side by the light diffusing and transmitting part, which has a large surface area, while the remaining light is reflected inside the transparent light guide plate and changes the angle of incidence and reflection. is guided to the vicinity of the side of the transparent light guide plate through repeated total reflection. Therefore, in this way, it is possible to guide the light in the area of strong light intensity near the light source to the area of weak light intensity far from the light source, forming a surface light source with very uniform brightness and little light loss as a whole. I will do it.
以下、図面を参照しながらこの発明の実施例をさらに詳
しく説明する。
第１図はこの発明の面発光装置の一実施例を示す断面図
である。第２〜３図はその平面図である。
１は光源、２は透明導光板、３は光拡散層、４は光散乱
反射板、５は光拡散透過部、６は湾曲反射板をそれぞれ
示す。
この面発光装置は、第１〜３図に示すように、透明導光
板２の両側面に光源１をそれぞれ配置して光源１からの
光で透明導光板２を照射するものであり、透明導光板２
の裏面に光源１から遠ざかるにつれてその面積が次第に
大きくなるように光拡散通過部５を形成するとともに、
透明導光板２の光拡散透過部５を形成した面に光散乱反
射板４を配置するように構成した。
透明導光板２としては、アクリル樹脂、ガラス、ポリカ
ーボネート、ポリ塩化ビニルなどを用いるのが好ましい
、実施例としては、縦２４０ｍｍ、横１７０−一、厚さ
６−の透明アクリル板を使用した。透明導光板２の側面
は平滑面に研磨するのが好ましく、透明導光板２の表裏
両面に対する両側面（対向する面）に光源１をそれぞれ
配置する。光源１は透明導光板２の一方の側面にのみ配
置するようにしてもよい。
光源１としては、蛍光灯や冷陰極管などの線光源を配置
するか、またはランプやＬＥＤなどの点光源を並べて構
成するとよい。実施例としては、管長２７０ｍｍ・直径
６■−の冷陰極管を光源１として使用した。また、光源
１の透明導光板２とは反対側に湾曲反射板６を配置し、
その内面の鏡面により光源１からの光を透明導光板２側
に反射して光を有効に使えるようにしてもよい。
一方、透明導光板２の裏面には、光源１から遠ざかるに
つれてその面積が次第に大きくなるようなグラデーショ
ンの光拡散透過部５を形成する。
光拡散透過部５には中空ポリマーが含まれるが、実施例
としては、アクリル球状中空ポリマーを透明メジウムイ
ンキに重量比で１０％加え均一に分散させたものをスク
リーン印刷法にて形成した。光拡散透過部５は、第２図
に示すように円形とし、その径寸法を変えることによっ
て面積を変化させることができる。光源１よりこの光拡
散透過部５に到達した光はここで拡散し、透明導光板２
の表面に向かったり、透明導光板２のさらに光源１から
離れた方向など多方向に向かう。光拡散透過部５は円形
のドツト状に形成したが、円形に限らず任意の形状のド
ツト状に形成してもよい。また、ストライプ状に形成し
てもよい。また、第３図に示すようにひし形に形成して
もよい。
透明導光Ｆｉ２の表面全面には、必要に応して、光拡散
物質がコーティングされた光拡散ｊｉ１３を透明導光板
２に完全密着させないように配置する。
光拡散Ｎ３を透明導光板２に密着させないことにより、
透明導光板２の内部で全反射が確保され、透明導光板２
内部でのロスが少なく十分に光を反射させることができ
る。この光拡散層３の具体例としでは、株式会社きもと
製の光拡散フィルムＤ２０４がある。また、光拡散層３
としては、上記のような構成のもののほかに、フィルム
自体が光拡散性を有するものや、乳白色の樹脂板など同
様な効果を奏するものを使用してもよい。
さらに、光散乱反射Ｆｉ４は、白色に塗装した板材を透
明導光板２の裏面に配置することにより形成することが
できる。光散乱反射板４と光拡散透過部５とが重なる部
分において、光は光拡散透過部５で光拡散するだけでな
く、光拡散透過部５を通り抜けるものもある。光拡散透
過部５を通り抜けた光は光散乱反射層４で反射し、再び
光拡散透過部５に入る。光散乱反射板４では、入射角に
関係なく反射、散乱する。したがって、この光は光拡散
透過部５から光散乱反射板４を介して光拡散透過部５を
通過し、合計３回光拡散・光散乱部分を経るので、ロス
が少なく発光することになる。
この光散乱反射板４は透明導光板２とは別体に形成され
、かつ、透明導光板２の裏面に重ね合わせるように配置
される。よって、透明導光板２の光拡散透過部５が形成
されていない部分には密着しないようにし、その部分と
光散乱反射板４との間には少なくともわずかな隙間が形
成されるようにする。通常は、透明導光板２としてのた
とえばアクリル板の表面に白色板を重ねるだけでよい。
なお、光散乱反射板４としては白色板を使用する替わり
に、透明導光板２および光源１を収納するケースの透明
導光板２および光源１に相対する面を光散乱反射効率の
よい白色塗料にて塗装または印刷するようにしてもよい
。また、白色シートと金属箔とを貼り合わせたものを光
散乱反射板４としてもよい。Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the surface emitting device of the present invention. 2 and 3 are plan views thereof. 1 is a light source, 2 is a transparent light guide plate, 3 is a light diffusion layer, 4 is a light scattering reflection plate, 5 is a light diffusion transmission part, and 6 is a curved reflection plate. As shown in FIGS. 1 to 3, this surface emitting device has light sources 1 disposed on both sides of a transparent light guide plate 2 and illuminates the transparent light guide plate 2 with light from the light sources 1. light plate 2
A light diffusion passage part 5 is formed on the back surface of the light source 1 so that its area gradually increases as it moves away from the light source 1, and
The light scattering/reflection plate 4 was arranged on the surface of the transparent light guide plate 2 on which the light diffusion/transmission section 5 was formed. As the transparent light guide plate 2, it is preferable to use acrylic resin, glass, polycarbonate, polyvinyl chloride, etc. As an example, a transparent acrylic plate with a length of 240 mm, a width of 170 mm, and a thickness of 6 mm was used. The side surfaces of the transparent light guide plate 2 are preferably polished to a smooth surface, and the light sources 1 are disposed on both sides (opposing surfaces) of the front and back surfaces of the transparent light guide plate 2, respectively. The light source 1 may be arranged only on one side of the transparent light guide plate 2. As the light source 1, a linear light source such as a fluorescent lamp or a cold cathode tube may be arranged, or a point light source such as a lamp or an LED may be arranged. In this example, a cold cathode tube with a tube length of 270 mm and a diameter of 6 mm was used as the light source 1. Further, a curved reflection plate 6 is arranged on the opposite side of the transparent light guide plate 2 of the light source 1,
The mirror surface of the inner surface may reflect the light from the light source 1 toward the transparent light guide plate 2 side, so that the light can be used effectively. On the other hand, on the back surface of the transparent light guide plate 2, a light diffusing and transmitting portion 5 is formed with a gradation whose area gradually increases as the distance from the light source 1 increases. The light diffusing and transmitting portion 5 contains a hollow polymer, and in this example, 10% by weight of an acrylic spherical hollow polymer was added to transparent medium ink and uniformly dispersed, and it was formed by screen printing. The light diffusing and transmitting portion 5 has a circular shape as shown in FIG. 2, and its area can be changed by changing its diameter. The light that reaches this light diffusing and transmitting section 5 from the light source 1 is diffused here and passes through the transparent light guide plate 2.
The light is directed toward the surface of the transparent light guide plate 2, and in a direction further away from the light source 1 of the transparent light guide plate 2. Although the light diffusing and transmitting portion 5 is formed in the shape of a circular dot, it is not limited to the circular shape and may be formed in any shape of a dot. Alternatively, it may be formed in a stripe shape. Alternatively, it may be formed into a diamond shape as shown in FIG. On the entire surface of the transparent light guide Fi2, if necessary, a light diffuser ji13 coated with a light diffusing substance is arranged so as not to be in complete contact with the transparent light guide plate 2. By not bringing the light diffusion N3 into close contact with the transparent light guide plate 2,
Total reflection is ensured inside the transparent light guide plate 2, and the transparent light guide plate 2
Light can be reflected sufficiently with little internal loss. A specific example of the light diffusion layer 3 is light diffusion film D204 manufactured by Kimoto Co., Ltd. In addition, the light diffusion layer 3
In addition to the structure described above, it is also possible to use a film that itself has light diffusing properties, a milky white resin plate, and other materials that provide similar effects. Furthermore, the light scattering reflection Fi4 can be formed by arranging a plate material painted white on the back surface of the transparent light guide plate 2. In the portion where the light scattering/reflecting plate 4 and the light diffusing/transmitting section 5 overlap, the light not only diffuses in the light diffusing/transmitting section 5 but also passes through the light diffusing/transmitting section 5 . The light passing through the light diffusing and transmitting section 5 is reflected by the light scattering and reflecting layer 4 and enters the light diffusing and transmitting section 5 again. The light scattering/reflecting plate 4 reflects and scatters the light regardless of the incident angle. Therefore, this light passes through the light diffusing and transmitting part 5 from the light diffusing and transmitting part 5 via the light scattering and reflecting plate 4, and passes through the light diffusing and light scattering part three times in total, so that light is emitted with less loss. This light scattering and reflecting plate 4 is formed separately from the transparent light guide plate 2, and is arranged so as to overlap the back surface of the transparent light guide plate 2. Therefore, the transparent light guide plate 2 is made not to come into close contact with the portion where the light diffusion/transmission portion 5 is not formed, and at least a slight gap is formed between that portion and the light scattering/reflection plate 4. Normally, it is sufficient to simply overlay a white plate on the surface of, for example, an acrylic plate as the transparent light guide plate 2. In addition, instead of using a white plate as the light scattering and reflecting plate 4, the surface facing the transparent light guide plate 2 and the light source 1 of the case that houses the transparent light guide plate 2 and the light source 1 is coated with white paint that has high light scattering and reflection efficiency. It may also be painted or printed. Alternatively, the light scattering and reflecting plate 4 may be made of a white sheet and a metal foil pasted together.
この発明の面発光装置は、透明導光板の端面に光源が配
置され、透明導光板の裏面に光拡散透過部が形成され、
さらにその上に光散乱反射板が重ねて配置された面発光
装置において、光拡散透過部が中空ポリマーを含むよう
に構成されている。
したがって、光拡散透過部に顔料を使用していないので
、光散乱物質による光の吸収が少なく、高い輝度で発光
させることができる。In the surface emitting device of the present invention, a light source is arranged on the end surface of the transparent light guide plate, a light diffusion transmitting part is formed on the back surface of the transparent light guide plate,
Further, in a surface emitting device in which a light scattering/reflecting plate is disposed in an overlapping manner, the light diffusing and transmitting part is configured to include a hollow polymer. Therefore, since no pigment is used in the light-diffusing and transmitting portion, light absorption by the light-scattering substance is reduced, and light can be emitted with high brightness.
第１図はこの発明の面発光装置の一実施例を示す断面図
である。第２〜３図はその平面図である。
１・・・光源、２・・・透明導光板、３・・・光拡散層
、４・・・光散乱反射板、５・・・光拡散透過部、６・
・・湾曲反射板。
特許出願人 日本写真印刷株式会社
第２図
第３図FIG. 1 is a sectional view showing an embodiment of the surface emitting device of the present invention. 2 and 3 are plan views thereof. DESCRIPTION OF SYMBOLS 1... Light source, 2... Transparent light guide plate, 3... Light diffusing layer, 4... Light scattering reflection plate, 5... Light diffusing and transmitting part, 6...
...Curved reflector. Patent applicant Nissha Printing Co., Ltd. Figure 2 Figure 3
Claims (1)
裏面に光拡散透過部が形成され、さらにその上に光散乱
反射板が重ねて配置された面発光装置において、光拡散
透過部が中空ポリマーを含むことを特徴とする面発光装
置。 ２ 中空ポリマーが、直径０．１〜２０μｍのアクリル
系樹脂からなるものである請求項１記載の面発光装置。[Claims] 1. In a surface emitting device in which a light source is arranged on the end face of a transparent light guide plate, a light diffusing and transmitting part is formed on the back face of the transparent light guide plate, and a light scattering and reflecting plate is further arranged in an overlapping manner thereon. , a surface emitting device characterized in that the light diffusing and transmitting portion includes a hollow polymer. 2. The surface emitting device according to claim 1, wherein the hollow polymer is made of acrylic resin and has a diameter of 0.1 to 20 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2190109A JPH0476593A (en) | 1990-07-18 | 1990-07-18 | Face light emission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2190109A JPH0476593A (en) | 1990-07-18 | 1990-07-18 | Face light emission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0476593A true JPH0476593A (en) | 1992-03-11 |
Family
ID=16252530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2190109A Pending JPH0476593A (en) | 1990-07-18 | 1990-07-18 | Face light emission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0476593A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06102402A (en) * | 1992-09-22 | 1994-04-15 | Meitaku Syst:Kk | Dot pattern of edge light panel |
| JPH0720793A (en) * | 1993-07-06 | 1995-01-24 | Katsuhiko Seki | Production of black mask filter for led display by screen printing |
| JPH0915404A (en) * | 1995-06-27 | 1997-01-17 | Katsuhiko Seki | Light diffusion filter by screen printing and its production |
| WO1997008252A1 (en) * | 1995-08-30 | 1997-03-06 | Minnesota Mining And Manufacturing Company | Back light reflection sheet for liquid crystal |
| US6579606B1 (en) | 1995-08-30 | 2003-06-17 | 3M Innovative Properties Company | Back light reflection sheet for liquid crystal |
-
1990
- 1990-07-18 JP JP2190109A patent/JPH0476593A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06102402A (en) * | 1992-09-22 | 1994-04-15 | Meitaku Syst:Kk | Dot pattern of edge light panel |
| JPH0720793A (en) * | 1993-07-06 | 1995-01-24 | Katsuhiko Seki | Production of black mask filter for led display by screen printing |
| JPH0915404A (en) * | 1995-06-27 | 1997-01-17 | Katsuhiko Seki | Light diffusion filter by screen printing and its production |
| WO1997008252A1 (en) * | 1995-08-30 | 1997-03-06 | Minnesota Mining And Manufacturing Company | Back light reflection sheet for liquid crystal |
| US6579606B1 (en) | 1995-08-30 | 2003-06-17 | 3M Innovative Properties Company | Back light reflection sheet for liquid crystal |
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