JPH10293304A - Light transmitting plate and surface light source device using the same - Google Patents
Light transmitting plate and surface light source device using the sameInfo
- Publication number
- JPH10293304A JPH10293304A JP9099924A JP9992497A JPH10293304A JP H10293304 A JPH10293304 A JP H10293304A JP 9099924 A JP9099924 A JP 9099924A JP 9992497 A JP9992497 A JP 9992497A JP H10293304 A JPH10293304 A JP H10293304A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light guide
- light source
- transparent
- minute
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶ディスプレイ
等のバックライト装置として使用されるに好適な、光利
用効率の高い透明導光体に関し、特に光利用効率の点で
劣る光拡散板を使用することなく、光利用効率の高い全
反射面を導光体内部に配置した導光体に関し、またその
導光体を用いた面光源装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent light guide having a high light use efficiency, which is suitable for use as a backlight device of a liquid crystal display or the like, and particularly to a light diffusing plate which is inferior in light use efficiency. The present invention relates to a light guide in which a total reflection surface having high light use efficiency is disposed inside a light guide without using a light guide, and to a surface light source device using the light guide.
【０００２】[0002]
【従来の技術】従来、この種の導光体装置としては、実
開平７−２９５３２に開示されているような面光源装置
が知られている。即ち、透明平行導光体の下面に、微小
球状シリコンを混入した半透明インクからなる拡散パタ
ーンを配置し、また上面に拡散シートを配置した面光源
装置であるが、基本的に拡散現象を利用する装置である
ため、本質的に光利用効率の低いものである。また、特
開平７−２７０６２２に開示されるような面光源装置も
知られている。即ち、楔状導光体の上面に光拡散シート
を配置し、その下面には凸凹形状の粗面（拡散面）を形
成した構成のもので、上記先行技術と同様、光利用効率
の低い光拡散現象を利用した発明である。また、特開平
７−１２０７５２に開示されるような液晶表示装置用バ
ックライトも知られている。即ち、楔状導光体の底面
に、導光体中を伝搬した光を導光体上面に反射するため
の光拡散性微細構造を形成したバックライトであるが、
これもまた上述の先行技術と同様、光利用効率の低い光
拡散現象を利用した発明である。また、特開平７−１５
１９２４に開示されるような面光源装置も知られてい
る。即ち、透明平板型導光体の裏面に極小多数の錐突起
を形成し、その導光体を傾斜反射面によって裏面側から
照明する構成の面光源装置である。2. Description of the Related Art Conventionally, as a light guide device of this type, a surface light source device as disclosed in Japanese Utility Model Laid-Open No. 7-29532 is known. That is, a surface light source device in which a diffusion pattern made of translucent ink mixed with micro-spherical silicon is arranged on the lower surface of a transparent parallel light guide, and a diffusion sheet is arranged on the upper surface. Therefore, the light use efficiency is essentially low. Further, a surface light source device as disclosed in JP-A-7-270622 is also known. That is, a light diffusion sheet is arranged on the upper surface of a wedge-shaped light guide, and a rough surface (diffusion surface) having an uneven shape is formed on the lower surface thereof. This is an invention utilizing a phenomenon. Further, a backlight for a liquid crystal display device as disclosed in Japanese Patent Application Laid-Open No. 7-120755 is also known. That is, a backlight in which a light diffusing fine structure for reflecting light propagating in the light guide to the upper surface of the light guide is formed on the bottom surface of the wedge-shaped light guide,
This is also an invention utilizing a light diffusion phenomenon with low light use efficiency, as in the above-described prior art. Also, JP-A-7-15
A surface light source device as disclosed in 1924 is also known. That is, the surface light source device has a configuration in which a very small number of conical projections are formed on the back surface of the transparent flat plate type light guide, and the light guide is illuminated from the back side by the inclined reflection surface.
【０００３】[0003]
【発明が解決使用とする課題】以上述べたように、従来
の光導光体装置は、光の乱反射による拡散現象を利用す
るので、光全反射現象を利用するものに比較して光利用
効率の点で劣るという不都合があった。本発明はかかる
従来技術の問題点を解決するために光全反射現象を利用
した光導光体及びそれを利用した面光源装置の提供を目
的とする。As described above, the conventional light guide device uses the diffusion phenomenon due to the irregular reflection of light, so that the light utilization efficiency is lower than that using the total light reflection phenomenon. There was a disadvantage that it was inferior in point. SUMMARY OF THE INVENTION An object of the present invention is to provide a light guide using a total internal reflection phenomenon and a surface light source device using the same, in order to solve the problems of the related art.
【０００４】[0004]
【課題を解決するための手段】本発明は、このような従
来技術の問題点を解決するために、『側断面が楔状に形
成された透明導光体の底面に、断面形状が鋸歯状であ
り、かつ鋸歯の角度がそれぞれほぼ一定である多数の微
小突起をほぼ等間隔に形成し、かつ該微小突起の各々の
底部に全反射面を設け、該全反射面による内面反射を利
用して、該微小突起と対向する出光面から輝度均一な光
を放射させる構成』とした。また、『側断面が楔状に形
成された透明導光体と、該側断面とほぼ垂直な側面に配
置された線光源と、該透明導光体の底面に、断面形状が
鋸歯状であり、鋸歯の角度がそれぞれほぼ一定であり、
かつほぼ等間隔に形成された多数の微小突起と、該微小
突起の各々の底部に設けられた全反射面と、前記線光源
からの光が該全反射面によって全反射されて、該微小突
起と対向する出光面から光量均一な輝度光を放射させる
様にして構成』とした。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a method in which "a transparent light guide having a wedge-shaped side section is provided with a saw-toothed cross-sectional shape. There, and a number of small projections each having a substantially constant sawtooth angle are formed at substantially equal intervals, and a total reflection surface is provided at the bottom of each of the minute projections, and internal reflection by the total reflection surface is used. Configuration in which light with uniform brightness is emitted from the light emitting surface facing the minute projections ”. Also, `` a transparent light guide whose side cross section is formed in a wedge shape, a line light source disposed on a side surface substantially perpendicular to the side cross section, and a bottom surface of the transparent light guide has a sawtooth cross section, The angles of the saw teeth are almost constant,
A large number of minute projections formed at substantially equal intervals, a total reflection surface provided at the bottom of each of the minute projections, and light from the linear light source is totally reflected by the total reflection surface to form the minute projections. To emit uniform brightness light from the light exit surface facing the light emitting device.
【０００５】[0005]
【発明の実施の形態】以下、図面を参照して本発明の実
施形態を詳細に説明する。図１及び図２に示す本発明の
一実施形態において、透明材質で形成された透明導光体
１は、その出光面２はフラットな平面であるが、その底
面は出光面２に対して傾斜（図面では実際よりも誇張し
て描かれている傾斜）しており、従って側断面がほぼ楔
状を呈している。その底面には断面形状がほぼ鋸歯状で
あり、その各鋸歯の角度θがほぼ一定である多数の微小
突起４Ａ，４Ｂがほぼ等間隔に形成されている。鋸歯状
の微小突起は、出光面２にほぼ垂直な光入射面４Ａとそ
の光入射面４Ａとほぼθの角度傾斜した斜面反射面４Ｂ
とから構成される。各鋸歯の底部には微小全反射面３が
設けられ、それによって出光面２から放射される光束の
密度、即ち該出光面２の輝度が均一化され得る。即ち、
透明導光体１の一側面（最も厚い側面）に配置された線
状光源５から放射される光線は、図２の拡大部分断面図
に示すように、全反射面３で全反射され光源５から遠ざ
かる方向に導光体１内部を反射を繰り返しながら伝達さ
れ、光源から遠い位置でも出光面２から放射される。従
って、光源に近い光束密度の高い位置においてばかりで
なく、遠くて光束密度の低い位置においても出光面２か
ら放射される光束密度、即ち輝度が均一化され得る。こ
の微小全反射面３の面積は、光源５から遠ざかるにつれ
て減少するように形成される。また、この全反射面は、
出光面２と平行か又は透明導光体１に入射した光がこの
微小全反射面３で全反射できる程度の範囲で傾斜してい
ても良い。この微小全反射面３の部分には、例えばアル
ミニューム金属等を蒸着させてより全反射効率を高めて
もよい。そのため、従来使用していた指向性を高めるた
めの例えばプリズム等を必要としない利点がある。ま
た、各鋸歯の角度θを一定としたので、透明導光体を製
造するための母型を形成するのが容易となる利点があ
る。線光源５は、例えば点光源の集合体であっても良
い。Embodiments of the present invention will be described below in detail with reference to the drawings. In one embodiment of the present invention shown in FIGS. 1 and 2, a transparent light guide 1 formed of a transparent material has a light emitting surface 2 that is a flat plane, but has a bottom surface inclined with respect to the light emitting surface 2. (The slope is exaggerated in the drawings.) Therefore, the side section is substantially wedge-shaped. On the bottom surface, the cross-sectional shape is substantially saw-toothed, and a large number of minute projections 4A and 4B, in which the angle θ of each saw-tooth is substantially constant, are formed at substantially equal intervals. The serrated micro-projections are composed of a light incident surface 4A substantially perpendicular to the light exit surface 2 and a slope reflecting surface 4B inclined at an angle of approximately θ with respect to the light incident surface 4A.
It is composed of A minute total reflection surface 3 is provided at the bottom of each saw tooth, so that the density of the light beam emitted from the light exit surface 2, that is, the brightness of the light exit surface 2 can be made uniform. That is,
Light rays emitted from the linear light source 5 disposed on one side (the thickest side) of the transparent light guide 1 are totally reflected by the total reflection surface 3 as shown in the enlarged partial cross-sectional view of FIG. The light is transmitted while repeating reflection inside the light guide 1 in a direction away from the light source, and is radiated from the light exit surface 2 even at a position far from the light source. Accordingly, the luminous flux density, that is, the luminance, radiated from the light exit surface 2 can be made uniform not only at a position where the luminous density is close to the light source but also at a position that is far and at a low luminous density. The area of the minute total reflection surface 3 is formed so as to decrease as the distance from the light source 5 increases. Also, this total reflection surface
The light may be inclined in a range parallel to the light exit surface 2 or within a range in which light incident on the transparent light guide 1 can be totally reflected by the minute total reflection surface 3. For example, aluminum metal or the like may be deposited on the minute total reflection surface 3 to increase the total reflection efficiency. For this reason, there is an advantage that, for example, a prism or the like for improving directivity, which has been conventionally used, is not required. In addition, since the angle θ of each saw tooth is fixed, there is an advantage that it is easy to form a matrix for manufacturing a transparent light guide. The line light source 5 may be, for example, an aggregate of point light sources.
【０００６】この様に斜面反射面４Ｂで全反射された光
のみが出光面２に向うことになる。斜面反射面で全反射
され、出光面から放射される光線は図３に説明される様
に臨界角を越えて斜面反射面４Ｂに到達した光線のみで
あるから出光面へ向う光の角度も限定され、平行光線に
近くなるため、出射光の指向性が高まることになる。図
３において、角度Ａは斜面反射面４Ｂで全反射する入射
角の範囲（臨界角はＣ）を示すが、垂直面４Ａでの屈折
を無視するならば、該傾斜反射面への入射が可能であ
り、かつ全反射する範囲は最大Ｂとなる。なぜならば、
（Ａ−Ｂ）の角度では光が入ってこないからであり、一
方角度（Ａ−Ｂ）で光を入れるには光源が鋸歯先端より
下になければならないからである。したがって、傾斜反
射面に当ってから出光面に向かう光は角度Ｂで入射した
光の全反射光に限定される。[0006] Only the light totally reflected by the inclined reflecting surface 4 B is directed to the light emitting surface 2. The light rays totally reflected by the inclined reflecting surface and emitted from the light emitting surface are only the light beams reaching the inclined reflecting surface 4B exceeding the critical angle as described in FIG. 3, so that the angle of the light traveling toward the light emitting surface is also limited. As a result, the light becomes closer to a parallel light beam, so that the directivity of the emitted light increases. In FIG. 3, the angle A indicates the range of the incident angle at which the light is totally reflected by the inclined reflecting surface 4B (the critical angle is C). However, if refraction at the vertical surface 4A is ignored, the light can be incident on the inclined reflecting surface. And the range of total reflection is B at the maximum. because,
This is because light does not enter at the angle (AB), while the light source must be below the sawtooth tip to enter light at the angle (AB). Therefore, the light that reaches the light exit surface after hitting the inclined reflection surface is limited to the total reflection light of the light incident at the angle B.
【０００７】図４は、本発明の別実施態様として、透明
導光体１を用いた面光源装置を示すもので、図１の透明
光導体１の出光面２に対向して光拡散板６を配置し、そ
れによって輝度のさらなる均一化を図り、かつ該透明光
導体１の下方に光反射板７を配置し、それによって該透
明光導体１から下方に漏洩した光線をも該光反射板７の
反射を利用して透明光導体１へ戻し、光利用効率をより
一層向上せしめることが可能となる。FIG. 4 shows a surface light source device using a transparent light guide 1 as another embodiment of the present invention. The light diffusing plate 6 faces the light exit surface 2 of the transparent light guide 1 of FIG. , Whereby the brightness is further uniformed, and a light reflecting plate 7 is provided below the transparent light guide 1, whereby light leaking downward from the transparent light guide 1 is also removed by the light reflecting plate 7. 7, the light is returned to the transparent light guide 1 by utilizing the reflection, and the light use efficiency can be further improved.
【０００８】一方、鋸歯状微小突起によって形成される
斜面反射面４Ｂは光源からの光を受けて反射光を出光面
２に放射させるか（光線ａ，ｂ，ｃ，ｄ，ｅ）、屈折さ
せて（光線ｆ，ｇ，ｈ）方向を変えながら次の鋸歯状突
起４Ａ，４Ｂの傾斜反射面４Ｂに導光する。斜面反射面
４Ｂで反射するか、屈折して次の斜面反射面に向かうか
は光の入射角に依存する。即ち透明導光体１の屈折率に
よって定まる臨界角を越えた角度で入射した光線はその
まま全反射されて（光線ａ，ｂ，ｃ，ｄ，ｅ）出光面２
に向かう。臨界角以下で斜面反射面４Ｂに到達した光線
は屈折をくり返した後最終的には臨界角を越えた角度で
次の斜面反射面４Ｂに到達し（光線ｆ，ｇ，ｈ）、ここ
で全反射されて出光面２に向う。On the other hand, the inclined reflecting surface 4B formed by the serrated minute projections receives the light from the light source and radiates the reflected light to the light emitting surface 2 (light rays a, b, c, d, e) or refracts the reflected light. While changing the direction (light rays f, g, h), the light is guided to the inclined reflection surface 4B of the next sawtooth projection 4A, 4B. Whether the light is reflected by the inclined reflecting surface 4B or refracted toward the next inclined reflecting surface depends on the incident angle of light. That is, light rays incident at an angle exceeding the critical angle determined by the refractive index of the transparent light guide 1 are totally reflected as they are (light rays a, b, c, d, e) and the light exit surface 2
Head for. After reaching the inclined reflecting surface 4B at a critical angle or less, the light ray repeatedly refracts and finally reaches the next inclined reflecting surface 4B at an angle exceeding the critical angle (light rays f, g, h). The light is reflected toward the light emitting surface 2.
【０００９】[0009]
【発明の効果】以上述べたように、本発明によれば次ぎ
の効果が発揮され得る。 （１）透明光導体に設けた複数の微小全反射面によって
光利用効率の良好な全反射が行われ、それによって光源
より遠い位置まで光線を有効に誘導することが出来、そ
れによって透明光導体の出光面から放射される光束の輝
度が均一化され得る。 （２）微小突起斜面での反射光を出光させるので、放射
光の光束指向性も向上するので、従来のプリズム等を使
用する必要性が解消され得る。 （３）各鋸歯の角度θをほぼ一定としたので、透明導光
体製造のための母型製造が容易となる効果がある。As described above, according to the present invention, the following effects can be obtained. (1) The plurality of minute total reflection surfaces provided on the transparent light guide perform total reflection with good light use efficiency, thereby effectively guiding light rays to a position farther from the light source, and thereby, the transparent light guide. The brightness of the light beam emitted from the light exit surface can be made uniform. (2) Since the reflected light on the inclined surface of the minute projection is emitted, the directivity of the luminous flux of the emitted light is also improved, so that the necessity of using a conventional prism or the like can be eliminated. (3) Since the angle θ of each saw tooth is made substantially constant, there is an effect that the production of a master mold for producing a transparent light guide is facilitated.
【図１】本発明の一実施形態としての透明導光体の外観
を示す斜視図。FIG. 1 is a perspective view showing the appearance of a transparent light guide as one embodiment of the present invention.
【図２】図１の透明導光体の内部における、入射光線の
微小全反射面および斜面反射面における反射現象及び屈
折現象を説明するための拡大部分断面図。FIG. 2 is an enlarged partial cross-sectional view for describing a reflection phenomenon and a refraction phenomenon on a minute total reflection surface and an inclined reflection surface of an incident light beam inside the transparent light guide of FIG.
【図３】本発明における光全反射の原理を説明するため
の光線図。FIG. 3 is a ray diagram for explaining the principle of total light reflection in the present invention.
【図４】図１に示した透明導光体を利用した面光源装置
を示す概略側面図。FIG. 4 is a schematic side view showing a surface light source device using the transparent light guide shown in FIG. 1;
１ 透明導光体 ２ 出光面 ３ 微小全反射面 ４Ａ 光入射面 ４Ｂ 斜面反射面 ５ 線状光源 ６ 光拡散板 ７ 光反射板 REFERENCE SIGNS LIST 1 transparent light guide 2 light emitting surface 3 minute total reflection surface 4A light incidence surface 4B slope reflection surface 5 linear light source 6 light diffusion plate 7 light reflection plate
Claims (6)
底面に、断面形状が鋸歯状であり、かつ各鋸歯の角度が
それぞれほぼ一定である多数の微小突起をほぼ等間隔に
形成し、かつ該微小突起の各々の底部に微小全反射面及
び斜面反射面を設け、該微小全反射面によって該透明導
光体の出光面の全面における輝度均一化を図り、該斜面
反射面による内面反射を利用して、該微小突起と対向す
る出光面から輝度均一な光束を放射させることを特徴と
する透明導光板。1. A plurality of minute projections having a sawtooth cross-section and a substantially constant angle of each sawtooth are formed at substantially equal intervals on the bottom surface of a transparent light guide having a wedge-shaped side section. And a minute total reflection surface and a slope reflection surface are provided at the bottom of each of the minute projections. The minute total reflection surface achieves uniform brightness over the entire light exit surface of the transparent light guide, and the slope reflection surface A transparent light guide plate, wherein a light beam having uniform luminance is emitted from a light emitting surface facing the minute projections by utilizing internal reflection.
断面とほぼ垂直な１側面の近傍に線状光源が配置され、
該線状光源からの光線が前記微小全反射面によって全反
射されて、該透明導光板の該線状光源から遠い側面方向
へ導かれると共に、前記斜面反射面によっても輝度均一
な光束が前記出光面から放出されることを特徴とする透
明導光板。2. The linear light source according to claim 1, wherein a linear light source is disposed near one side surface substantially perpendicular to a side cross section of the transparent light guide,
Light rays from the linear light source are totally reflected by the minute total reflection surface, are guided to the side surface of the transparent light guide plate far from the linear light source, and the luminous flux having uniform brightness is also emitted by the inclined reflection surface. A transparent light guide plate, which is emitted from a surface.
前記線状光源から遠ざかるに従って小面積となることを
特徴とする透明導光板。3. The transparent light guide plate according to claim 2, wherein the minute total reflection surface has a smaller area as the distance from the linear light source increases.
と、該透明導光体の側断面とほぼ垂直な側面の近傍に配
置された線状光源と、該透明導光体の底面に、その断面
形状が鋸歯状であり、各鋸歯の角度がそれぞれほぼ一定
であり、かつほぼ等間隔に形成された多数の微小突起
と、該微小突起の各々の底部に設けられた微小全反射面
とその斜面に設けられた斜面反射面と、前記線状光源か
らの光線が該微小全反射面によって全反射されて該透明
導光体の該線状光源から遠い側面方向に導光され、該斜
面反射面からの反射光が、該微小突起と対向する出光面
から輝度の均一な光束を放射させるようにしたことを特
徴とする面光源装置。4. A transparent light guide having a wedge-shaped side section, a linear light source disposed near a side surface substantially perpendicular to the side section of the transparent light guide, and a bottom surface of the transparent light guide. In addition, the cross-sectional shape is a sawtooth shape, the angle of each sawtooth is substantially constant, and a large number of minute projections formed at substantially equal intervals, and minute total reflection provided at the bottom of each of the minute projections A surface and a slope reflection surface provided on the slope thereof, and light rays from the linear light source are totally reflected by the minute total reflection surface and are guided in a side direction far from the linear light source of the transparent light guide, A surface light source device, wherein light reflected from the inclined reflecting surface emits a light beam having uniform luminance from a light emitting surface facing the minute projection.
光面の近傍にそれに対向して光拡散板を配置し、かつ該
透明導光体の底面の近傍にそれに対向して光反射板を配
置したことを特徴とする面光源装置。5. The transparent light guide according to claim 4, further comprising: a light diffusion plate disposed near the light exit surface of the transparent light guide and opposed to the light guide surface, and a light reflection plate located near the bottom surface of the transparent light guide and opposed thereto. A surface light source device characterized by disposing.
前記線状光源から遠ざかるに従って小面積となることを
特徴とする面光源装置。6. The surface light source device according to claim 4, wherein the small total reflection surface has a smaller area as the distance from the linear light source increases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9099924A JPH10293304A (en) | 1997-04-17 | 1997-04-17 | Light transmitting plate and surface light source device using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9099924A JPH10293304A (en) | 1997-04-17 | 1997-04-17 | Light transmitting plate and surface light source device using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10293304A true JPH10293304A (en) | 1998-11-04 |
Family
ID=14260321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9099924A Pending JPH10293304A (en) | 1997-04-17 | 1997-04-17 | Light transmitting plate and surface light source device using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10293304A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000055382A (en) * | 1999-02-05 | 2000-09-05 | 구자홍 | Back-light module for liquid crystal display |
| KR100301666B1 (en) * | 1999-04-12 | 2001-09-26 | 구본준, 론 위라하디락사 | Subsidiary Light Source for Liquid Crystal Display of Reflective Type |
| JP2002042530A (en) * | 2000-07-27 | 2002-02-08 | Yasuhiro Koike | Surface light-source device |
| KR20020066788A (en) * | 2001-02-13 | 2002-08-21 | 심충건 | Light Guide Panel in LCD device with a latticed V-extruded type pattern and the manufacturing method of it |
| KR20020083886A (en) * | 2001-06-08 | 2002-11-04 | 화우테크놀러지 주식회사 | Light guide panel of backlight unit |
| EP1574897A1 (en) * | 2004-03-11 | 2005-09-14 | Canon Kabushiki Kaisha | Ring illumination apparatus and photographing apparatus having the same |
| WO2007046625A1 (en) * | 2005-10-19 | 2007-04-26 | Jeong-Soon Kim | Light guide plate |
| KR100867066B1 (en) * | 2000-09-25 | 2008-11-04 | 미츠비시 레이온 가부시키가이샤 | Surface light source device |
| US7760290B2 (en) | 2005-04-08 | 2010-07-20 | Bong Sup Kang | Multi-reflecting device and backlight unit and display device having multi-reflecting architecture |
| JP2011234150A (en) * | 2010-04-28 | 2011-11-17 | Panasonic Corp | Light guide body, and illuminator and document reader equipped with the same |
-
1997
- 1997-04-17 JP JP9099924A patent/JPH10293304A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000055382A (en) * | 1999-02-05 | 2000-09-05 | 구자홍 | Back-light module for liquid crystal display |
| KR100301666B1 (en) * | 1999-04-12 | 2001-09-26 | 구본준, 론 위라하디락사 | Subsidiary Light Source for Liquid Crystal Display of Reflective Type |
| JP2002042530A (en) * | 2000-07-27 | 2002-02-08 | Yasuhiro Koike | Surface light-source device |
| JP4553218B2 (en) * | 2000-07-27 | 2010-09-29 | 康博 小池 | Surface light source device |
| KR100867066B1 (en) * | 2000-09-25 | 2008-11-04 | 미츠비시 레이온 가부시키가이샤 | Surface light source device |
| KR20020066788A (en) * | 2001-02-13 | 2002-08-21 | 심충건 | Light Guide Panel in LCD device with a latticed V-extruded type pattern and the manufacturing method of it |
| KR20020083886A (en) * | 2001-06-08 | 2002-11-04 | 화우테크놀러지 주식회사 | Light guide panel of backlight unit |
| US7486885B2 (en) | 2004-03-11 | 2009-02-03 | Canon Kabushiki Kaisha | Illumination apparatus and photographing apparatus having the same |
| CN100412680C (en) * | 2004-03-11 | 2008-08-20 | 佳能株式会社 | Illumination apparatus and photographing apparatus having the same |
| EP1574897A1 (en) * | 2004-03-11 | 2005-09-14 | Canon Kabushiki Kaisha | Ring illumination apparatus and photographing apparatus having the same |
| US7760290B2 (en) | 2005-04-08 | 2010-07-20 | Bong Sup Kang | Multi-reflecting device and backlight unit and display device having multi-reflecting architecture |
| WO2007046625A1 (en) * | 2005-10-19 | 2007-04-26 | Jeong-Soon Kim | Light guide plate |
| JP2011234150A (en) * | 2010-04-28 | 2011-11-17 | Panasonic Corp | Light guide body, and illuminator and document reader equipped with the same |
| US8564854B2 (en) | 2010-04-28 | 2013-10-22 | Panasonic Corporation | Light guide body, and lighting apparatus and document scanning apparatus having the same |
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