JPH046706A - Face illumination device - Google Patents
Face illumination deviceInfo
- Publication number
- JPH046706A JPH046706A JP2112454A JP11245490A JPH046706A JP H046706 A JPH046706 A JP H046706A JP 2112454 A JP2112454 A JP 2112454A JP 11245490 A JP11245490 A JP 11245490A JP H046706 A JPH046706 A JP H046706A
- Authority
- JP
- Japan
- Prior art keywords
- flat plate
- light guide
- incident
- light
- 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.)
- Granted
Links
- 238000005286 illumination Methods 0.000 title claims description 38
- 230000007423 decrease Effects 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 12
- 230000001771 impaired effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000001151 other effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、通過照明用サイン、表示板等の面照明装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a surface illumination device for passing illumination signs, display boards, and the like.
〔従来の技術〕
第１４図および第１６図に従来例を示す。すなわち、第
１４図の面照明装置は、略棒状をなす光源５０と、入射
面５１となる端面を光＃５０の長手方向と直角な方向に
対向した板状体であって、片面を発光面５２とし、他の
片面を拡散反射処理面５３とし、かつ入射面５１から遠
ざかるほど板厚が漸次小さくなるように発光面５２を傾
斜させた透明導光体５４とを備えている。光ＳＳＯの光
を入射面５１に入射させ、発光面５２の裏面で一部の光
を全反射して光源５０と反対側に光を導きつつ、拡散反
射処理面５３に均一に光を分配するものである。なお発
光面５２は反射処理する場合がある。[Prior Art] A conventional example is shown in FIG. 14 and FIG. 16. That is, the surface illumination device shown in FIG. 14 includes a substantially rod-shaped light source 50 and a plate-like body whose end face serving as an incident surface 51 faces in a direction perpendicular to the longitudinal direction of light #50, and one side is a light emitting surface. 52, the other side is a diffuse reflection treated surface 53, and the transparent light guide 54 has a light emitting surface 52 inclined such that the plate thickness becomes gradually smaller as the distance from the incident surface 51 increases. The light of the optical SSO is made incident on the incident surface 51, and part of the light is totally reflected on the back surface of the light emitting surface 52 to guide the light to the side opposite to the light source 50, while uniformly distributing the light to the diffuse reflection treated surface 53. It is something. Note that the light emitting surface 52 may be subjected to reflection treatment.
第１６図の面照明装置は、透明導光体５５の内部に拡散
材料５６を混入し、その濃度を光源５０から遠ざかるに
つれて濃くすることによって、両面で均一な光散乱が生
じるようにしたものである。The area illumination device shown in FIG. 16 has a diffusing material 56 mixed inside a transparent light guide 55, and its concentration increases as it moves away from the light source 50, so that uniform light scattering occurs on both sides. be.
ところが、第１４図の面照明装置は、第１５図に示すよ
うに光源５０から入射面５１に入射する光のうち発光面
５２の方向に向く光（斜線の範囲）の一部が発光面５１
の臨界角による全反射で光制御されるが、矢印Ｐで示す
拡散反射面５３に向く光は制御されず、このため設計の
自由度が低くなる。また、発光面５２の傾斜する部分が
あるため、発光面５２の大きさや透明導光板５４の厚さ
が制限されるという欠点があった。However, in the area illumination device shown in FIG. 14, as shown in FIG.
Although the light is controlled by total reflection due to the critical angle of , the light directed toward the diffuse reflection surface 53 indicated by the arrow P is not controlled, which reduces the degree of freedom in design. Further, since there is an inclined portion of the light emitting surface 52, there is a drawback that the size of the light emitting surface 52 and the thickness of the transparent light guide plate 54 are limited.
また第１６図の面照明装置は、拡散材料５６が微粒子で
あるため、第１７図に矢印で示すようにほとんど全方向
に散乱される。したがって、光源５０側へ戻る光が多く
、光源５０と反対側へ到達する光が少なくなり、均一化
が困難になるとともに効率が悪いという欠点があった。Further, in the area illumination device shown in FIG. 16, since the diffusion material 56 is a fine particle, it is scattered in almost all directions as shown by the arrows in FIG. 17. Therefore, much light returns to the light source 50 side, and less light reaches the opposite side from the light source 50, making it difficult to achieve uniformity and having poor efficiency.
したがって、この発明の目的は、入射面に入射する光を
すべて制御できて、発光面より効率よ（均一に発光させ
ることができる面照明装置を提供することである。Therefore, an object of the present invention is to provide a surface illumination device that can control all the light incident on the incident surface and emit light more efficiently (and more uniformly) than the light emitting surface.
［課題を解決するための手段〕
請求項ｉｌｌの面照明装置は、略棒状をなす光源と、入
射面となる端面を前記光源の長手方向に沿って対向した
板状体であって、片面を発光面とし、かつ他の片面を拡
散反射処理面とした透明導光体とを備え、前記透明導光
体よりも低屈折率の多数の平板状部を前記透明導光体の
内部に略均等に配置するとともに、前記平板状部の前記
入射面に対する前記拡散反射処理面側への傾斜角を前記
平板状部の前記入射面から遠ざかるものほど大としたも
のである。[Means for Solving the Problems] A surface illumination device according to claim ill comprises a substantially rod-shaped light source and a plate-like body whose end faces serving as incident surfaces face each other along the longitudinal direction of the light source, one side of which is opposite to each other along the longitudinal direction of the light source. a transparent light guide having a light emitting surface and a diffuse reflection treated surface on the other side, and a large number of flat plate-like parts having a lower refractive index than the transparent light guide are arranged substantially uniformly inside the transparent light guide. , and the angle of inclination of the flat plate portion toward the diffuse reflection processing surface with respect to the incident surface is made larger as the distance from the incidence surface of the flat plate portion increases.
請求項（２）の面照明装置は、略棒状をなす光源と、入
射面となる端面を前記光源の長手方向と直角な方向に対
向した板状体であって、片面を発光面とし、かつ他の片
面を拡散反射処理面とした透明導光体とを備え、前記透
明導光体よりも低屈折率の多数の平板状部を、前記入射
面に対して前記拡散反射処理面側に所定の角度傾斜させ
、しかも前記透明導光体の板厚方向の分布密度が前記入
射面から遠ざかるほど漸次増大するように、前記透明導
光体の内部に配置したものである。The surface illumination device according to claim (2) includes a substantially rod-shaped light source, a plate-like body whose end face serving as an incident surface faces in a direction perpendicular to the longitudinal direction of the light source, and one side of which is a light-emitting surface; a transparent light guide whose other side is a diffuse reflection treated surface, and a plurality of flat plate-shaped parts having a lower refractive index than the transparent light guide are predetermined on the side of the diffuse reflection treated surface with respect to the incident surface. and is arranged inside the transparent light guide so that the distribution density in the thickness direction of the transparent light guide gradually increases as the distance from the incident surface increases.
請求項（３）の面照明装置は、略棒状をなす光源と、入
射面となる端面を前記光源の長手方向と直角な方向に対
向した板状体であって、片面を発光面とし、かつ他の片
面を拡散反射処理面とした透明導光体とを備え、前記透
明導光体よりも低屈折率の多数の平板状部を前記透明導
光体の内部に配置するとともに、平板状部の分布密度を
前記入射面から遠ざかるほど漸次増大し、かつ前記平板
状部の前記入射面に対する前記拡散反射処理面の傾斜角
を前記平板状部の前記入射面から遠ざかるものほど大と
したものである。The surface illumination device according to claim (3) includes a substantially rod-shaped light source, and a plate-like body whose end face serving as an incident surface faces in a direction perpendicular to the longitudinal direction of the light source, and one side is a light-emitting surface, and a transparent light guide whose other side is treated with diffuse reflection, and a large number of flat plate-like parts having a lower refractive index than the transparent light guide are disposed inside the transparent light guide, and the flat plate-like parts The distribution density gradually increases as the distance from the incident surface increases, and the angle of inclination of the diffuse reflection treated surface with respect to the incident surface of the flat plate portion increases as the distance from the incident surface of the flat plate portion increases. be.
請求項（４）の面照明装置は、略棒状をなす光源と、入
射面となる端面を前記光源の長手方向と直角な方向に対
向した板状体であって、片面を発光面とし、他の片面を
拡散反射処理面とし、かつ前記入射面から遠ざかるほど
板厚が漸次小さくなるように前記発光面を傾斜させた透
明導光体とを備え、前記透明導光体よりも低屈折率の平
板状部を前記拡散反射処理面の近傍で前記拡散反射処理
面に略平行に多数配置するとともに、前記平板状部の分
布密度を前記入射面から遠ざかるほど漸次減少したもの
である。The surface illumination device according to claim (4) includes a light source having a substantially rod shape, and a plate-like body whose end face serving as an incident surface faces in a direction perpendicular to the longitudinal direction of the light source, one face being a light emitting face, and the other face being a light emitting face. a transparent light guide having a diffuse reflection treated surface on one side, and the light emitting surface is inclined so that the plate thickness gradually decreases as the distance from the incident surface increases, and the transparent light guide has a refractive index lower than that of the transparent light guide. A large number of flat portions are arranged near the diffuse reflection treated surface and substantially parallel to the diffuse reflection treated surface, and the distribution density of the flat portions is gradually decreased as the distance from the incident surface increases.
請求項（５）の面照明装置は、請求項（１）、請求項（
２）、請求項（３）または請求項（４）において、前記
透明導光体が、複数の薄板を前記光源の長手方向に積層
してなるものである。The surface illumination device of claim (5) is based on claim (1), claim (
2) In claim (3) or claim (4), the transparent light guide is formed by laminating a plurality of thin plates in the longitudinal direction of the light source.
請求項（６）の面照明装置は、請求項（５）において、
前記薄板にそれぞれ位置合わせ用突起と位１合わせ用孔
とを一体に形成したものである。The area lighting device according to claim (6) is characterized in that according to claim (5),
A positioning projection and a positioning hole are integrally formed on each of the thin plates.
請求項（７）の面照明装置は、請求項（６）において、
前記平板状部は孔であり、前記位置合わせ用孔は前記平
板状部を兼用したものである。The surface illumination device according to claim (7) is characterized in that according to claim (6),
The flat plate portion is a hole, and the alignment hole also serves as the flat plate portion.
請求項［１１の面照明装置によれば、光源より透明導光
体の入射面に入射した光は透明導光体の内部に進入し、
低屈折率の多数の平板状部に入射する。According to the surface illumination device of claim [11], the light incident on the incident surface of the transparent light guide from the light source enters the inside of the transparent light guide,
The light enters a large number of flat plate-shaped parts with low refractive index.
この場合、前記平板状部の前記入射面に対する前記拡散
反射処理面側への傾斜角を、前記平板状部の前記入射面
から遠ざかるものほど大としているため、前記拡散反射
処理面へ全反射する光が入射面から遠ざかるほど多くな
る。前記拡散反射処理面を反射した拡散光は発光面より
出射するから、全体として発光面の輝度を均一にするこ
とができる。その結果、前記入射面に入射する光をすべ
て制御できて、前記発光面より効率よく均一に発光させ
ることができる。また透明導光体の厚さおよび発光面の
大きさが制限されない。In this case, since the angle of inclination toward the diffuse reflection treated surface with respect to the incident surface of the flat plate portion is made larger as the distance from the incidence surface of the flat plate portion increases, the total reflection to the diffuse reflection treated surface is increased. The farther the light is from the plane of incidence, the more it increases. Since the diffused light reflected by the diffuse reflection treated surface is emitted from the light emitting surface, the brightness of the light emitting surface can be made uniform as a whole. As a result, all of the light incident on the incident surface can be controlled, and the light can be emitted more efficiently and uniformly from the light emitting surface. Further, the thickness of the transparent light guide and the size of the light emitting surface are not limited.
請求項（２）の面照明装置によれば、前記平板状部が前
記透明導光体の前記入射面に対して前記拡散反射処理面
側に所定の角度傾斜し、かつ前記平板状部の前記入射面
からみた分布密度を、前記入射面から遠ざかるほど漸次
増大したため、前記入射面側の前記平板状部はまばらに
配置されているので前記入射面と反対側に透過する光が
多く、また前記入射面と反対側になるほど平板状部が密
であるので前記拡散反射処理面に全反射する光が増大す
る。その結果、全体として発光面の輝度を均一にするこ
とができる。According to the surface illumination device of claim (2), the flat plate portion is inclined at a predetermined angle toward the diffuse reflection treated surface with respect to the incident surface of the transparent light guide, and Since the distribution density seen from the incident surface gradually increased as the distance from the incident surface increased, since the flat plate portions on the side of the incident surface were sparsely arranged, more light was transmitted to the side opposite to the incident surface. Since the plate-like portions are denser toward the side opposite to the incident surface, the amount of light that is totally reflected on the diffuse reflection treated surface increases. As a result, the luminance of the light emitting surface can be made uniform as a whole.
請求項（３）の面照明装置によれば、前記平板状部の分
布密度を前記入射面から遠ざかるほど漸次増大し、かつ
前記平板状部の前記入射面に対する前記拡散反射処理面
の傾斜角を前記平板状部の前記入射面から遠ざかるもの
ほど大としたため、前記入射面側はど前記入射面と反対
側に透過する光が多くなるとともに、前記入射面から遠
ざかるほど前記拡散反射処理面に全反射する光が増加す
る。According to the surface illumination device of claim (3), the distribution density of the flat portion is gradually increased as the distance from the incidence surface increases, and the inclination angle of the diffuse reflection treated surface with respect to the incidence surface of the flat portion is increased. Since the plate-shaped portion is made larger as it moves away from the incident surface, more light passes through the incident surface to the side opposite to the incident surface, and the further away from the incident surface the more light is transmitted to the diffuse reflection treated surface. More light is reflected.
その結果、前記発光面から発光する輝度をほぼ均一にす
ることができる。As a result, the luminance of light emitted from the light emitting surface can be made substantially uniform.
請求項（４）の面照明装置によれば、前記平板状部を前
記拡散反射処理面の近傍で前記拡散反射処理面に略平行
に多数配置するとともに、前記平板状部の分布密度を前
記入射面から遠ざかるほど漸次減少したため、前記入射
面側の前記平板状部はど全反射して前記発光面に入射し
さらに一部が全反射して前記入射面と反対側に到達する
光が多くなる。その結果、前記発光面から発光する輝度
をほぼ均一にすることができる。According to the surface illumination device of claim (4), a large number of the flat portions are arranged near the diffuse reflection treated surface and substantially parallel to the diffuse reflection treated surface, and the distribution density of the flat portions is adjusted to Since the light gradually decreased as the distance from the surface increases, the light is totally reflected by the flat plate portion on the side of the incident surface and enters the light emitting surface, and then a portion of the light is totally reflected and more light reaches the side opposite to the incident surface. . As a result, the luminance of light emitted from the light emitting surface can be made substantially uniform.
請求項（５）の面照明装置によれば、請求項ｆｉｌ、請
求項（２）、請求項（３）または請求項（４）の作用の
ほか、複数の薄板を前記光源の長手方向に積層すること
により前記透明導光体を形成しているため、前記透明導
光体を容易に製造することができる。According to the surface lighting device of claim (5), in addition to the effects of claim fil, claim (2), claim (3), or claim (4), a plurality of thin plates are laminated in the longitudinal direction of the light source. Since the transparent light guide is formed by doing so, the transparent light guide can be easily manufactured.
請求項（６）の面照明装置によれば、請求項（５）の作
用のほか、前記薄板にそれぞれ位置合わせ用突起と、位
１合わせ用孔とを一体に形成しているため、薄板相互の
結合が容易なり、別部品の結合手段が不要になるととも
に組立容易になる。According to the surface illumination device of claim (6), in addition to the effect of claim (5), since the thin plates are each integrally formed with a positioning projection and a positioning hole, This makes it easier to connect the parts, eliminates the need for connecting means for separate parts, and facilitates assembly.
請求項（７）の面照明装置によれば、請求項（６）の作
用のほか、前記位置合わせ用孔を前記平板状部で兼用し
たため、構造が簡単になるとともに、嵌合状態で位置合
わせ用突起と位置合わせ用孔との間に空気層があるので
全反射は損なわれない。According to the surface illumination device of claim (7), in addition to the effect of claim (6), since the positioning hole is also used as the flat plate-like portion, the structure is simplified and positioning can be performed in the fitted state. Since there is an air layer between the positioning projection and the positioning hole, total reflection is not impaired.
この発明の第１の実施例を第１図ないし第６図に基づい
て説明する。すなわち、この面照明装置は、光源１と、
透明導光体２を有する。A first embodiment of the present invention will be described based on FIGS. 1 to 6. That is, this surface lighting device includes a light source 1,
It has a transparent light guide 2.
光源１は略棒状をなし、実施例では直管ランプを用いて
いる。The light source 1 has a substantially rod shape, and in the embodiment, a straight tube lamp is used.
透明導光体２は、入射面３となる端面を光源１の長手方
向に沿って対向した板状体であって、片面を発光面４と
し、かつ他の片面を拡散反射処理面５としている。The transparent light guide 2 is a plate-shaped body whose end surfaces serving as the incident surface 3 are opposed along the longitudinal direction of the light source 1, and one side is a light emitting surface 4 and the other side is a diffuse reflection treated surface 5. .
また、透明導光体２よりも低屈折率の多数の平板状部６
を透明導光体２の内部に略均等に配置するとともに、平
板状部６の入射面３に対する前記拡散反射処理面５側へ
の傾斜角θ。（第２図）を入射面３から遠ざかるものほ
ど大としている。Further, a large number of flat plate-like portions 6 having a lower refractive index than the transparent light guide 2
are arranged substantially evenly inside the transparent light guide 2, and the angle θ of inclination of the flat plate portion 6 toward the diffuse reflection treated surface 5 with respect to the incident surface 3. (FIG. 2) is made larger as the distance from the incident surface 3 increases.
実施例の透明導光体２は透明プラスチックまたは硝子で
形成し、平板状部６はスリットを実施例とし、中空成形
によって形成したり、低屈折率の板材をインサート成形
することにより形成する。The transparent light guide 2 of the embodiment is made of transparent plastic or glass, and the flat plate portion 6 has a slit in the embodiment, and is formed by hollow molding or by insert molding a plate material with a low refractive index.
また拡散反射処理面５の表面には反射板（図示せず）を
設置してもよい、７は発光面４の前面に設けられた拡散
板である。Further, a reflection plate (not shown) may be installed on the surface of the diffuse reflection treated surface 5, and 7 is a diffusion plate provided in front of the light emitting surface 4.
この面照明装置は、光源１より入射面３に入射した光Ｌ
１が、第３図に示すように±４５度の範囲に屈折される
。すなわち、透明導光体２の屈折率は約１．３〜１．６
であり、空気の屈折率は約１．０であるので、全反射が
起こる臨界角（入射する面の法線と入射する光のなす角
度）は約３８．７〜５０．３度であるが、ここで、透明
導光体２の屈折率１．４１とし、全反射する臨界角４５
度とする。This surface illumination device has light L incident on an incident surface 3 from a light source 1.
1 is refracted within a range of ±45 degrees as shown in FIG. That is, the refractive index of the transparent light guide 2 is approximately 1.3 to 1.6.
Since the refractive index of air is approximately 1.0, the critical angle at which total reflection occurs (the angle between the normal to the incident surface and the incident light) is approximately 38.7 to 50.3 degrees. , where the refractive index of the transparent light guide 2 is 1.41, and the critical angle for total reflection is 45.
degree.
第４図は入射面３を屈折した光が入射面３の近くの平板
状部６に入射する光１＃Ｌ２を示している。FIG. 4 shows light 1#L2 that is refracted by the entrance surface 3 and enters the flat plate portion 6 near the entrance surface 3.
この場合、平板状部６は入射面３に略平行であり平板状
部６に対する入射角（入射する面の法線と入射する光の
なす角度）θは４５度以内であるので、全反射せずほと
んどの光が平板状部６を透過する。同図（ｂｌはその透
過光の範囲ａを示している。In this case, the flat plate part 6 is approximately parallel to the incident surface 3, and the angle of incidence (the angle between the normal to the incident surface and the incident light) θ with respect to the flat plate part 6 is within 45 degrees, so there is no total reflection. Most of the light passes through the flat plate portion 6. In the figure (bl indicates the range a of the transmitted light).
第５図は透明導光体２の中央付近の平板状部６であり、
平板状部６の傾斜角θ。が次第に大きくなって、平板状
部６に入射する光の一部Ｌ３０入射角が臨界角を超えて
全反射した状態を示している。同図（ｂｌは全反射した
光すを示している。FIG. 5 shows a flat plate-shaped portion 6 near the center of the transparent light guide 2.
Inclination angle θ of the flat plate portion 6. gradually increases, and the incident angle L30 of part of the light incident on the flat plate portion 6 exceeds the critical angle, indicating a state where it is totally reflected. In the same figure (bl indicates totally reflected light beams).
第６図は平板状部６がさらに入射面３がら遠ざかって、
入射面３に対して傾斜角θ。が約４５度になった状態で
ある。この場合、平板状部６に入射する光の約１／２の
光り、が全反射されることになる。そして光源Ｉからさ
らに離れる平板状部６はど全反射する光量が大きくなる
。FIG. 6 shows that the flat plate portion 6 is further moved away from the entrance surface 3.
Inclination angle θ with respect to the incident surface 3. is about 45 degrees. In this case, approximately 1/2 of the light incident on the flat plate portion 6 will be totally reflected. The amount of light that is totally reflected increases as the flat plate portion 6 moves further away from the light source I.
ゆえに、透明導光体２の光源１側は入射光が強いので、
平板状部６の傾斜角θ。を入射面３がら遠ざかるにつれ
て大きくすることにより、拡散反射処理面５へ光が均一
に分配されるようにでき、発光面４の輝度を均一にする
ことができる。Therefore, since the incident light is strong on the light source 1 side of the transparent light guide 2,
Inclination angle θ of the flat plate portion 6. By increasing the distance from the incident surface 3, the light can be uniformly distributed to the diffuse reflection treated surface 5, and the brightness of the light emitting surface 4 can be made uniform.
したがって、従来例と比較して入射面に入射する光のほ
とんどを光制御できる。すなわち、ムク材の透明導光体
と異なり、光制御性が高いので、目的の面積の均一照明
を実現する設計の自由度が高い。また、拡散材料の混入
がないので、光源１の方向に逆戻りする光もほとんどな
く、効率よく均一に発光させることができ、大きい面積
の面照明に適している。さらに、第１３図の従来例と比
較して、透明導光体２の厚さおよび発光面４の大きさが
制限されない。Therefore, compared to the conventional example, most of the light incident on the incident surface can be optically controlled. That is, unlike a transparent light guide made of solid wood, it has high light controllability, so there is a high degree of freedom in design to achieve uniform illumination of a desired area. Further, since there is no mixing of a diffusion material, there is almost no light that returns in the direction of the light source 1, and light can be emitted efficiently and uniformly, making it suitable for surface illumination of a large area. Furthermore, compared to the conventional example shown in FIG. 13, the thickness of the transparent light guide 2 and the size of the light emitting surface 4 are not limited.
この発明の第２の実施例を第７図に示す。すなわち、こ
の面照明装置は、透明導光体２よりも低屈折率の多数の
平板状部６を透明導光体２の内部に配置するとともに、
入射面３に対して拡散反射処理面５偏に所定の角度傾斜
し、かつ平板状部６の入射面３からみた分布密度を、入
射面３から遠ざかるほど漸次増大している。A second embodiment of the invention is shown in FIG. That is, in this surface illumination device, a large number of flat plate portions 6 having a lower refractive index than the transparent light guide 2 are arranged inside the transparent light guide 2, and
The diffuse reflection treated surface 5 is inclined at a predetermined angle with respect to the incident surface 3, and the distribution density of the flat plate portion 6 seen from the incident surface 3 gradually increases as the distance from the incident surface 3 increases.
この実施例によれば、各平板状部６は同じ量の全反射光
を有するが、光源１例の平板状部６は分重密度がまばら
であるので平板状部６間を透過する光が多く、光源ｌか
ら遠ざかるほど密になるので平板状部６間を透過する光
が減り拡散反射処理面５に全反射する光が増加する。そ
の結果、全体として拡散反射処理面５に入射する光の分
配がほぼ同一となり、発光面４の輝度を均一にすること
ができる。その他、第１の実施例と同様の効果がある。According to this embodiment, each of the flat portions 6 has the same amount of totally reflected light, but since the flat portions 6 of one example of the light source have a sparse distribution density, the light that passes between the flat portions 6 is As the distance from the light source 1 increases, the density increases, so the amount of light transmitted between the flat plate portions 6 decreases and the amount of light totally reflected on the diffuse reflection treated surface 5 increases. As a result, the distribution of light incident on the diffuse reflection treated surface 5 becomes almost the same as a whole, and the brightness of the light emitting surface 4 can be made uniform. Other effects are similar to those of the first embodiment.
この発明の第３の実施例を第８図に示す。すなわち、こ
の面照明装置は、第１の実施例と第２の実施例とを組み
合わせたもので、平板状部６の分布密度を入射面３から
遠ざかるほど漸次増大し、かつ平板状部６の入射面３に
対する拡散反射処理面５の傾斜角θ。夕を平板状部６の
入射面３から遠ざかるものほど大としている。A third embodiment of the invention is shown in FIG. That is, this surface illumination device is a combination of the first embodiment and the second embodiment, and the distribution density of the flat plate portion 6 increases gradually as the distance from the incident surface 3 increases. An inclination angle θ of the diffuse reflection treated surface 5 with respect to the incident surface 3. The distance from the incident surface 3 of the flat plate portion 6 is greater.
この実施例によれば、入射面３側はど入射面３と反対側
に透過する光が多くなるとともに、入射面３から遠ざか
るほど拡散反射処理面５に全反射する光が増加する。そ
の結果、発光面４から発光する輝度をほぼ均一にするこ
とができる。その他第１の実施例と同様の効果がある。According to this embodiment, more light is transmitted to the side opposite to the entrance surface 3 on the side of the entrance surface 3, and the more the distance from the entrance surface 3 is, the more light is totally reflected on the diffuse reflection treated surface 5. As a result, the luminance of light emitted from the light emitting surface 4 can be made almost uniform. There are other effects similar to those of the first embodiment.
この発明の第４の実施例を第９図に示す。すなわち、こ
の面照明装置は、透明導光体２を入射面３から遠ざかる
ほど板厚が漸次小さくなるように発光面４を傾斜させる
とともに、透明導光体２よりも低屈折率の平板状部６を
拡散反射処理面５の近傍で拡散反射処理面５に略平行に
多数配置し、平板状部６の分布密度を、発光面４の輝度
が均一になるように入射面３から遠ざかるほど漸次減少
している。A fourth embodiment of the invention is shown in FIG. That is, in this surface illumination device, the light emitting surface 4 of the transparent light guide 2 is inclined such that the thickness of the transparent light guide 2 becomes gradually smaller as the distance from the entrance surface 3 increases, and a flat plate-like portion having a refractive index lower than that of the transparent light guide 2 is formed. A large number of flat portions 6 are arranged near the diffuse reflection treated surface 5 and substantially parallel to the diffuse reflection treated surface 5, and the distribution density of the flat plate portions 6 is gradually increased as the distance from the incident surface 3 increases so that the brightness of the light emitting surface 4 becomes uniform. is decreasing.
この実施例によれば、入射面３例の平板状部６はど全反
射して発光面４の裏面に入射しさらに一部が全反射して
入射面３と反対側に到達する光が多くなる。したがって
従来例の第１３図のように発光面と反対側に向けて入射
する光を平板状部６によって制御できるので、光制御が
十分にでき、しかも発光面４から発光する輝度をほぼ均
一にすることができる。According to this embodiment, much of the light is totally reflected by the flat plate portion 6 of the three incident surfaces and enters the back surface of the light emitting surface 4, and then a portion of the light is totally reflected and reaches the side opposite to the incident surface 3. Become. Therefore, as shown in FIG. 13 of the conventional example, since the light incident on the side opposite to the light emitting surface can be controlled by the flat plate part 6, sufficient light control can be achieved, and the brightness of the light emitted from the light emitting surface 4 can be almost uniform. can do.
また第１０図に示すように、光源１の近傍では拡散反射
処理部５′の密度を小さくすることによフて、拡散反射
処理部５′の間の平滑部分５″で全反射する反射光Ｌ５
を増やし、これによって透明導光体２の奥へ導光される
光を増やして発光面４の輝度均一化しようとするもの（
特願昭６２−２０２０５６号）と比較して、拡散反射処
理面５を一様に形成できるので、拡散反射処理面５の形
成が容易になる。その他、第１の実施例と同様に光制御
性が高く、効率がよいという効果がある。Furthermore, as shown in FIG. 10, by reducing the density of the diffuse reflection processing parts 5' in the vicinity of the light source 1, the reflected light is totally reflected at the smooth portion 5'' between the diffuse reflection processing parts 5'. L5
, thereby increasing the amount of light guided deep into the transparent light guide 2 to make the brightness of the light emitting surface 4 uniform (
Compared to Japanese Patent Application No. 62-202056), the diffuse reflection treated surface 5 can be formed uniformly, making it easier to form the diffuse reflection treated surface 5. In addition, similar to the first embodiment, this embodiment has the advantage of high light controllability and high efficiency.
この発明の第５の実施例を第１１図に示す。すなわち、
この面照明装置は、複数の薄板８を光源１の長手方向に
積層して透明導光体２を形成したものであり、透明導光
体２の製造が容易になる。A fifth embodiment of the invention is shown in FIG. That is,
In this surface lighting device, the transparent light guide 2 is formed by laminating a plurality of thin plates 8 in the longitudinal direction of the light source 1, and the transparent light guide 2 can be manufactured easily.
この発明の第６の実施例を第Ｉ２図に示す。すなわち、
この面照明装置は、各薄板８にそれぞれ位置合わせ用突
起９と、位置合わせ用孔１０とを一体に形成して、薄板
８の相互の結合を容易にするとともに、別部品の結合手
段を不要にし組立容易にしている。A sixth embodiment of the invention is shown in FIG. I2. That is,
In this surface illumination device, a positioning protrusion 9 and a positioning hole 10 are integrally formed on each thin plate 8, making it easy to connect the thin plates 8 to each other, and eliminating the need for a separate connecting means. It is easy to assemble.
なお、位置合わせ用突起９と位置合わせ用孔１０は機械
的接触であるので、平板状部６の全反射機能は損なわれ
ない。Note that since the alignment protrusion 9 and the alignment hole 10 are in mechanical contact, the total reflection function of the flat plate portion 6 is not impaired.
この実施例の変形例として、平板状部６で位置合わせ用
孔１０を兼用してもよい。このようにすると、構造が簡
単になるとともに、嵌合状態で位置合わせ用突起９と位
置合わせ用孔１０である平板状部６との間に空気層があ
るので全反射は損なわれない。As a modification of this embodiment, the flat plate portion 6 may also serve as the alignment hole 10. In this way, the structure becomes simple, and since there is an air layer between the alignment protrusion 9 and the flat plate portion 6, which is the alignment hole 10, in the fitted state, total reflection is not impaired.
この発明の第７の実施例を第１３図に示す。すなわち、
この面照明装置は、平板状部６を同図１ａｌでは端面か
らみて（さび形に形成し、同図（ｂｌは紡錘形に形成し
たものである。Ｌ６は透過光、Ｌ７は全反射光である。A seventh embodiment of the invention is shown in FIG. That is,
In this surface illumination device, the flat plate part 6 is formed into a wedge shape when viewed from the end face in FIG. .
第１の実施例等の平板状部６は端面からみて平行平板で
あったが、これに限らす略平行等の全方向の散乱性がな
いものであればよい。Although the flat plate portion 6 in the first embodiment was a parallel flat plate when viewed from the end face, it is not limited to this and may be substantially parallel as long as it does not have scattering property in all directions.
なお、この発明において、略棒状をなす光源は、多数の
点光源を列状に配列することにより構成してもよい。In addition, in this invention, the substantially rod-shaped light source may be constructed by arranging a large number of point light sources in a row.
請求項＋１３の面照明装置は、前記平板状部の前記入射
面に対する前記拡散反射処理面側への傾斜角を、前記平
板状部の前記入射面から遠ざかるものほど大としている
ため、発光面の輝度を均一にすることができ、前記透明
導光体の厚さおよび前記発光面の大きさが制限されるこ
とがなく、また前記入射面に入射する光をすべて制御で
きて、前記発光面より効率よく発光させることができる
という効果がある。In the surface illumination device according to claim 13, the angle of inclination of the flat plate portion toward the diffuse reflection processing surface with respect to the incident surface is made larger as the distance from the input surface of the flat plate portion increases. The brightness can be made uniform, the thickness of the transparent light guide and the size of the light emitting surface are not limited, and all the light incident on the incident surface can be controlled, so that the light emitting surface can be This has the effect of being able to emit light efficiently.
請求項（２）の面照明装置は、前記平板状部が前記透明
導光体の前記入射面に対して前記拡散反射処理面倒に所
定の角度傾斜し、かつ前記平板状部の前記入射面からみ
た分布密度を、前記入射面から遠ざかるほど漸次増大し
たため、第１の実施例と同様の効果がある。In the area illumination device according to claim (2), the flat plate portion is inclined at a predetermined angle with respect to the incident surface of the transparent light guide to facilitate the diffuse reflection process, and Since the observed distribution density gradually increases as the distance from the incident surface increases, the same effect as in the first embodiment can be obtained.
請求項（３）の面照明装置は、前記平板状部の分布密度
を前記入射面から遠ざかるほど漸次増大し、かつ前記平
板状部の前記入射面に対する前記拡散反射処理面の傾斜
角を前記平板状部の前記入射面から遠ざかるものほど大
としたため、第１の実施例と同様の効果がある。In the area illumination device according to claim (3), the distribution density of the flat plate portion is gradually increased as the distance from the incident surface increases, and the inclination angle of the diffuse reflection treated surface with respect to the incident surface of the flat plate portion is adjusted to increase the distribution density of the flat plate portion. Since the distance from the incident surface of the shaped portion is increased, the same effect as in the first embodiment can be obtained.
請求項（４）の面照明装置は、前記平板状部を前記拡散
反射処理面の近傍で前記拡散反射処理面に略平行に多数
配置するとともに、前記平板状部の分布密度を、前記発
光面の輝度が均一になるように前記入射面から遠ざかる
ほど漸次減少したため、発光面の輝度を均一にでき、光
制御性を高め、かつ効率を高めることができるとともに
、拡散反射処理部の密度を変化するものと比較して製造
容易になる。In the area illumination device according to claim (4), a large number of the flat portions are arranged near the diffuse reflection treated surface and substantially parallel to the diffuse reflection treated surface, and the distribution density of the flat portions is set to be equal to or smaller than the light emitting surface. The brightness of the light gradually decreases as it moves away from the incident surface, so that the brightness of the light emitting surface becomes uniform, making it possible to make the brightness of the light emitting surface uniform, improving light controllability and increasing efficiency, as well as changing the density of the diffuse reflection processing part. It is easier to manufacture compared to other products.
請求項（５）の面照明装置は、請求項（１）、請求項（
２）、請求項＋３）または請求項（４）の効果のほか、
複数の薄板を前記光源の長平方向に積層することにより
前記透明導光体を形成しているため、前記透明導光体を
容易に製造することができる。The surface illumination device of claim (5) is based on claim (1), claim (
In addition to the effects of claim 2), claim + 3) or claim (4),
Since the transparent light guide is formed by laminating a plurality of thin plates in the longitudinal direction of the light source, the transparent light guide can be easily manufactured.
請求項（６）の面照明装置は、請求項（５）の効果のほ
か、前記薄板にそれぞれ位置合わせ用突起と、位置合わ
せ用孔とを一体に形成しているため、薄板相互の結合が
容易なり、別部品の結合手段が不要になるとともに組立
容易になる。In addition to the effect of claim (5), the surface illumination device of claim (6) has the positioning protrusion and positioning hole integrally formed on each of the thin plates, so that the thin plates are not coupled to each other. This eliminates the need for means for connecting separate parts and facilitates assembly.
請求項（７）の面照明装置は、請求項（６）の効果のほ
か、前記位！合わせ用孔を前記平板状部で兼用したため
、構造が簡単になるとともに、嵌合状態で位置合わせ用
突起と位置合わせ用孔との間に空気層があるので全反射
は損なわれない。The surface illumination device of claim (7) has the same effects as described above in addition to the effects of claim (6). Since the flat plate portion serves as the alignment hole, the structure is simplified, and since there is an air layer between the alignment protrusion and the alignment hole in the fitted state, total reflection is not impaired.
第１図はこの発明の第１の実施例の側面図、第２図はそ
の平板状部を拡大して示す部分拡大図、第３図は入射面
へ入射する光線を説明する説明図、第４図ないし第６図
は平板状部に入射する光線の説明図、第７図は第２の実
施例の側面図、第８図は第３の実施例の側面図、第９図
は第４の実施例の側面図、第１０図は比較例の側面図、
第１１図は第５の実施例の透明導光体の斜視図、第１２
図は第６の実施例の透明導光体の薄板の結合を説明する
部分斜視図、第１３図は第７の実施例の平板状部の側面
図、第１４図は従来例の側面図、第１５図はその光制御
可能な入射光を説明する部分側面図、第１６図は他の従
来例の側面図、第１７図は光の散乱状態を説明する説明
図である。
■・・・光源、２・・・透明導光体、３・・・入射面、
４・・・発光面、５・・・拡散反射処理面、６・・・平
板状部Ｅ′ニーご：敷ｔ
ｌ ５図
（ａ）
（ｂ）
第４
（ａ
第
い
第
図
第
１０図
第
図
第
図
第１３囚
（ａ）
第
図
（ｂ）FIG. 1 is a side view of the first embodiment of the present invention, FIG. 2 is a partially enlarged view showing the flat plate-like part thereof, FIG. 4 to 6 are explanatory diagrams of the light rays incident on the flat plate-like part, FIG. 7 is a side view of the second embodiment, FIG. 8 is a side view of the third embodiment, and FIG. 9 is a side view of the fourth embodiment. FIG. 10 is a side view of the comparative example.
FIG. 11 is a perspective view of the transparent light guide of the fifth embodiment, and FIG.
The figure is a partial perspective view illustrating the connection of the thin plates of the transparent light guide of the sixth embodiment, FIG. 13 is a side view of the flat plate part of the seventh embodiment, and FIG. 14 is a side view of the conventional example. FIG. 15 is a partial side view illustrating the controllable incident light, FIG. 16 is a side view of another conventional example, and FIG. 17 is an explanatory diagram illustrating the state of light scattering. ■...Light source, 2...Transparent light guide, 3...Incidence surface,
4... Light emitting surface, 5... Diffuse reflection treated surface, 6... Flat plate-shaped portion E' knee: Layout t l 5 (a) (b) 4th (a Fig. 10) Figure Figure 13 Prisoner (a) Figure (b)
Claims (7)
源の長手方向に沿って対向した板状体であって、片面を
発光面とし、かつ他の片面を拡散反射処理面とした透明
導光体とを備え、前記透明導光体よりも低屈折率の多数
の平板状部を前記透明導光体の内部に略均等に配置する
とともに、前記平板状部の前記入射面に対する前記拡散
反射処理面側への傾斜角を前記平板状部の前記入射面か
ら遠ざかるものほど大とした面照明装置。(1) A substantially rod-shaped light source and a plate-like body whose end surfaces serving as incident surfaces face each other along the longitudinal direction of the light source, one surface of which is a light emitting surface and the other surface of which is a diffuse reflection treated surface. a transparent light guide, in which a large number of flat plate parts having a refractive index lower than that of the transparent light guide are arranged substantially evenly inside the transparent light guide; A surface illumination device in which the angle of inclination toward the diffuse reflection processing surface side increases as the distance from the incident surface of the flat plate portion increases.
源の長手方向と直角な方向に対向した板状体であって、
片面を発光面とし、かつ他の片面を拡散反射処理面とし
た透明導光体とを備え、前記透明導光体よりも低屈折率
の多数の平板状部を、前記入射面に対して前記拡散反射
処理面倒に所定の角度傾斜させ、しかも前記透明導光体
の板厚方向の分布密度が前記入射面から遠ざかるほど漸
次増大するように、前記透明導光体の内部に配置した面
照明装置。(2) A substantially rod-shaped light source, and a plate-like body whose end face serving as an incident surface faces in a direction perpendicular to the longitudinal direction of the light source,
a transparent light guide having one side as a light-emitting surface and the other side as a diffuse reflection treated surface, and a large number of flat plate-shaped parts having a lower refractive index than the transparent light guide, and facing the above-mentioned incident surface. Diffuse reflection treatment A surface illumination device arranged inside the transparent light guide so as to be tilted at a predetermined angle and such that the distribution density in the thickness direction of the transparent light guide gradually increases as the distance from the incident surface increases. .
源の長手方向と直角な方向に対向した板状体であって、
片面を発光面とし、かつ他の片面を拡散反射処理面とし
た透明導光体とを備え、前記透明導光体よりも低屈折率
の多数の平板状部を前記透明導光体の内部に配置すると
ともに、平板状部の分布密度を前記入射面から遠ざかる
ほど漸次増大し、かつ前記平板状部の前記入射面に対す
る前記拡散反射処理面の傾斜角を前記平板状部の前記入
射面から遠ざかるものほど大とした面照明装置。(3) A substantially rod-shaped light source, and a plate-like body whose end face serving as an incident surface faces in a direction perpendicular to the longitudinal direction of the light source,
a transparent light guide having one side as a light emitting surface and the other side as a diffuse reflection treated surface, and a large number of flat plate-like parts having a lower refractive index than the transparent light guide inside the transparent light guide; At the same time, the distribution density of the flat plate portion is gradually increased as the distance from the incidence surface increases, and the inclination angle of the diffuse reflection treated surface with respect to the incidence surface of the flat plate portion is made to be farther away from the incidence surface of the flat plate portion. A very large surface lighting device.
源の長手方向と直角な方向に対向した板状体であって、
片面を発光面とし、他の片面を拡散反射処理面とし、か
つ前記入射面から遠ざかるほど板厚が漸次小さくなるよ
うに前記発光面を傾斜させた透明導光体とを備え、前記
透明導光体よりも低屈折率の平板状部を前記拡散反射処
理面の近傍で前記拡散反射処理面に略平行に多数配置す
るとともに、前記平板状部の分布密度を前記入射面から
遠ざかるほど漸次減少した面照明装置。(4) A substantially rod-shaped light source, and a plate-like body with an end surface serving as an incident surface facing in a direction perpendicular to the longitudinal direction of the light source,
a transparent light guide having one side as a light emitting surface, the other side as a diffuse reflection treated surface, and the light emitting surface being inclined so that the plate thickness gradually decreases as the distance from the incident surface increases; A large number of plate-like parts having a refractive index lower than that of the body are arranged near the diffuse-reflection-treated surface and substantially parallel to the diffuse-reflection-treated surface, and the distribution density of the plate-like parts gradually decreases as the distance from the incident surface increases. Surface lighting device.
方向に積層してなる請求項（１）、請求項（２）、請求
項（３）または請求項（４）記載の面照明装置。(5) The surface according to claim (1), claim (2), claim (3), or claim (4), wherein the transparent light guide is formed by laminating a plurality of thin plates in the longitudinal direction of the light source. lighting equipment.
わせ用孔とを一体に形成している請求項（５）記載の面
照明装置。(6) The surface lighting device according to claim (5), wherein each of the thin plates has a positioning projection and a positioning hole integrally formed therein.
前記平板状部を兼用している請求項（６）記載の面照明
装置。(7) The surface illumination device according to claim 6, wherein the flat plate portion is a hole, and the positioning hole also serves as the flat plate portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2112454A JP3029637B2 (en) | 1990-04-24 | 1990-04-24 | Surface lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2112454A JP3029637B2 (en) | 1990-04-24 | 1990-04-24 | Surface lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH046706A true JPH046706A (en) | 1992-01-10 |
| JP3029637B2 JP3029637B2 (en) | 2000-04-04 |
Family
ID=14587042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2112454A Expired - Lifetime JP3029637B2 (en) | 1990-04-24 | 1990-04-24 | Surface lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3029637B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06314069A (en) * | 1993-03-03 | 1994-11-08 | Fujitsu Ltd | Illuminating device |
| US6167182A (en) * | 1996-10-25 | 2000-12-26 | Omron Corporation | Surface light source device and liquid crystal display device, portable telephone and information terminal employing the surface light source device |
| JP2006000562A (en) * | 2004-06-21 | 2006-01-05 | Sanyo Electric Co Ltd | Air conditioner |
| JP2008158462A (en) * | 2006-12-26 | 2008-07-10 | Tomoegawa Paper Co Ltd | Diffusing polarizer and optical element including same |
| EP2116762A1 (en) * | 2007-01-31 | 2009-11-11 | Fujifilm Corporation | Surface area illumination device |
| JP2014107240A (en) * | 2012-11-29 | 2014-06-09 | Fujikura Ltd | Light guide plate and photoirradiation device |
-
1990
- 1990-04-24 JP JP2112454A patent/JP3029637B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06314069A (en) * | 1993-03-03 | 1994-11-08 | Fujitsu Ltd | Illuminating device |
| US6612709B2 (en) | 1993-03-03 | 2003-09-02 | Fujitsu Display Technologies Corporation | Lighting device and display device using the lighting device |
| US6986600B2 (en) | 1993-03-03 | 2006-01-17 | Sharp Kabushiki Kaisha | Lighting device and display device using the lighting device |
| US6167182A (en) * | 1996-10-25 | 2000-12-26 | Omron Corporation | Surface light source device and liquid crystal display device, portable telephone and information terminal employing the surface light source device |
| JP2006000562A (en) * | 2004-06-21 | 2006-01-05 | Sanyo Electric Co Ltd | Air conditioner |
| JP2008158462A (en) * | 2006-12-26 | 2008-07-10 | Tomoegawa Paper Co Ltd | Diffusing polarizer and optical element including same |
| EP2116762A1 (en) * | 2007-01-31 | 2009-11-11 | Fujifilm Corporation | Surface area illumination device |
| EP2116762A4 (en) * | 2007-01-31 | 2013-04-03 | Fujifilm Corp | Surface area illumination device |
| JP2014107240A (en) * | 2012-11-29 | 2014-06-09 | Fujikura Ltd | Light guide plate and photoirradiation device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3029637B2 (en) | 2000-04-04 |
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