JPH0682631A - Surface illuminating device - Google Patents
Surface illuminating deviceInfo
- Publication number
- JPH0682631A JPH0682631A JP4238404A JP23840492A JPH0682631A JP H0682631 A JPH0682631 A JP H0682631A JP 4238404 A JP4238404 A JP 4238404A JP 23840492 A JP23840492 A JP 23840492A JP H0682631 A JPH0682631 A JP H0682631A
- Authority
- JP
- Japan
- Prior art keywords
- face
- light
- guide plate
- light guide
- transmission plate
- 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
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示器等の背面照
明に用いるバックライト装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device used for back lighting of a liquid crystal display or the like.
【０００２】[0002]
【従来の技術】従来、高分子学会年次大会予稿集（１９
９２年）４１巻３号８０２ページに小池らにより発表さ
れたように、ポリマー固体内に種々の大きさの相関距離
を有する不均一構造を形成させ、棒状あるいは面状に加
工し、ある一定方向に高効率で光を散乱照射させる高輝
度光散乱伝送体が提案されている。これは透明樹脂に光
拡散材料を混入させるといった旧来の方法ではなく、複
数のポリマーでミクロ相分離した不均一構造を形成させ
るとそれぞれの界面で光が散乱すると言うもので、新た
な照明用材料として注目を集めた。論文では図６のよう
な構成のバックライト装置についての記述があり良好に
動作したと報告されている。[Prior Art] Previously, Proceedings of Annual Meeting of the Polymer Society of Japan (19
1992) As published by Koike et al. In Volume 41, No. 3, page 802, a heterogeneous structure having various correlation distances was formed in a polymer solid and processed into a rod shape or a plane shape. A high-brightness light-scattering transmitter that scatters and irradiates light with high efficiency has been proposed. This is not the traditional method of mixing a light diffusing material into a transparent resin, but it is said that if a heterogeneous structure with microphase separation is formed with multiple polymers, light will be scattered at each interface, and a new lighting material. Attracted attention as. In the paper, there is a description of a backlight device having a configuration as shown in FIG. 6, and it is reported that it operates well.
【０００３】[0003]
【発明の解決しようとする課題】しかし、かかる従来の
面照明装置には以下のような問題点があった。However, the conventional surface lighting device has the following problems.
【０００４】それは図６のバックライト装置を点灯させ
ると導光板の端面近傍に縞模様状の光ムラが現われると
いうものである。これは図７に示すように導光板の中を
進行して端面で反射した光の主光線がその端面近くの上
下の出光面の間で反射を繰り返すことにより発生すると
いうメカニズムである事がわかった。That is, when the backlight device of FIG. 6 is turned on, striped light unevenness appears near the end face of the light guide plate. It is known that this is a mechanism in which the principal ray of light traveling through the light guide plate and reflected by the end face is repeatedly reflected between the upper and lower light emitting faces near the end face as shown in FIG. It was
【０００５】そこで本発明は従来のこの様な問題点を解
決するため、ミクロ相分離した不均一構造を形成したポ
リマー導光板の端面における反射光の方向を制御するこ
とで視覚的に不愉快な縞模様状の光ムラの発生を抑え、
品位の高い面照明を提供することを目的とする。Therefore, in order to solve the above-mentioned conventional problems, the present invention controls the direction of reflected light at the end face of a polymer light guide plate having a microphase-separated non-uniform structure so that a visually unpleasant fringe is formed. Suppresses the occurrence of patterned light unevenness,
The purpose is to provide high-quality surface lighting.
【０００６】[0006]
【課題を解決するための手段】前記課題を解決するため
に、本発明の面照明装置は、ミクロ相分離した不均一構
造を形成してなるポリマー導光板と前記導光板の端面に
配置された光源とを有する面照明装置において、前記導
光板の全てのあるいは一部の端面を拡散面としたことを
特徴とする。In order to solve the above-mentioned problems, the surface illuminating device of the present invention comprises a polymer light guide plate having a non-uniform structure with micro-phase separation and an end face of the light guide plate. In a surface lighting device having a light source, all or part of the end surface of the light guide plate is a diffusion surface.
【０００７】又、ミクロ相分離した不均一構造を形成し
てなるポリマー導光板と前記導光板の端面に配置された
光源とを有する面照明装置において、光源が配置されな
い全てのあるいは一部の端面に光を吸収する部材を密着
させたことを特徴とする。Further, in a surface lighting device having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged at an end face of the light guide plate, all or a part of the end face where no light source is arranged. It is characterized in that a member that absorbs light is closely attached to.
【０００８】又、ミクロ相分離した不均一構造を形成し
てなるポリマー導光板と前記導光板の端面に配置された
光源とを有する面照明装置において、前記導光板の全て
のあるいは一部の端面の近傍を拡散面としたことを特徴
とする。Further, in a surface lighting device having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged at an end face of the light guide plate, all or some end faces of the light guide plate are provided. Is characterized in that the vicinity of is a diffusion surface.
【０００９】又、ミクロ相分離した不均一構造を形成し
てなるポリマー導光板と前記導光板の端面に配置された
光源とを有する面照明装置において、前記導光板の一部
の端面を曲面で形成したことを特徴とする。Further, in a surface lighting device having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged on an end face of the light guide plate, a part of the end face of the light guide plate is curved. It is characterized by being formed.
【００１０】更に、ミクロ相分離した不均一構造を形成
してなるポリマー導光板と前記導光板の端面に配置され
た光源とを有する面照明装置において、前記導光板の全
てのあるいは一部の端面に透明部材を密着せしめてなる
ことを特徴とする。Further, in a surface lighting device having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged at an end face of the light guide plate, all or some end faces of the light guide plate are provided. It is characterized in that a transparent member is closely adhered to.
【００１１】[0011]
【実施例】以下に本発明の実施例を図面に基づいて詳細
に説明する。図１は本発明の面照明装置の一実施例を示
すもので、ミクロ相分離した不均一構造を持つ導光板１
の端面に光源２が配置されている。光源２の周りには光
を効率よく導光板１に導入できるようにリフレクター３
を配置してある。更に導光板の裏側には反射板４が置か
れており出光面５から光が導出される。導光板１にはＭ
ＭＡとＶｉｎｙｌＢｅｎｚｏａｔｅの共重合体やＰｏｌ
ｙ Ｔｒｉｆｌｕｏｒｏｅｔｈｙｌ Ｍｅｔｈａｃｒｙ
ｌａｔｅをＰＭＭＡの中に分散させた重合体を用い、１
００ｎｍから１０００ｎｍの相関距離を持たせた。図１
の導光板はほぼ均一厚みであるが入射端面から離れるに
したがって徐々に厚みが薄くなるように構成した導光板
でもかまわない。導光板の端面１０は拡散面になってお
り実際には白色系のペイントを塗布したが、面を梨地状
にする、あるいは梨地面の金属板あるいはフィルムを密
着させる等の方法でも良い。図１に示したように端面１
０で反射して再び戻ろうとする光線は拡散反射するため
図７のような縞模様状の光のビートは発生しない。な
お、この場合入射端面７の近傍にも光のビートがわずか
に発生するため、入射端面７を梨地状の拡散面としても
良い。Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an embodiment of the surface illuminating device of the present invention.
The light source 2 is arranged on the end face of the. A reflector 3 is provided around the light source 2 so that light can be efficiently introduced into the light guide plate 1.
Has been placed. Further, a reflection plate 4 is placed on the back side of the light guide plate, and light is emitted from the light emitting surface 5. M on the light guide plate 1
Copolymer and Pol of MA and Vinyl Benzoate
y Trifluoroethyl Methacy
Using a polymer in which the plate is dispersed in PMMA, 1
A correlation distance of 00 nm to 1000 nm was provided. Figure 1
The light guide plate may have a substantially uniform thickness, but the light guide plate may be configured such that the thickness gradually decreases as the distance from the incident end face increases. The end surface 10 of the light guide plate is a diffusion surface, and white paint is actually applied, but the surface may be satin-finished or a metal plate or film on the satin-finished surface may be adhered. End face 1 as shown in FIG.
The light rays that are reflected at 0 and try to return again are diffusely reflected, so that the beat of the striped pattern as shown in FIG. 7 does not occur. In this case, since a slight beat of light is generated near the incident end face 7, the incident end face 7 may be a matte diffusion surface.
【００１２】図２は本発明の面照明装置の他の実施例を
示す断面図であり、光の入射端面７を除く端面１０の一
部あるいはすべてに光吸収部材１１を密着させてある。
なお、他の構成要素は図１に示した実施例と同じであ
る。この場合は端面で反射する光線が吸収されるためや
はり縞模様状の光のビートは発生しないが、光源２の光
束の数パーセントが損失となるので輝度に余裕のある場
合に好適である。なお、光吸収部材１１には黒色のペイ
ントや黒いテープを接着剤で貼付ける等の手段が効果的
であった。FIG. 2 is a cross-sectional view showing another embodiment of the surface illuminating device of the present invention, in which a light absorbing member 11 is brought into close contact with part or all of the end surface 10 except the light incident end surface 7.
The other components are the same as those in the embodiment shown in FIG. In this case, since the light rays reflected by the end faces are absorbed, the beat of the striped light is not generated, but a few percent of the light flux of the light source 2 is lost, which is suitable when the brightness has a margin. It should be noted that a means such as sticking black paint or black tape with an adhesive was effective for the light absorbing member 11.
【００１３】図３は本発明の面照明装置の他の実施例を
示す断面図であり、端面１０近傍に拡散面１２を配置し
てある。この場合端面１０で反射して戻ろうとする光は
拡散面１２にあたり拡散光になるため、やはり規則的な
光のビートは発生できない。なお、拡散面１２は導光板
１にサンドペーパーをかける等で粗面加工したものが好
適であり、加工の幅（図中のｔ）は導光板１の端面１０
部での厚みｄとほぼ同等とすれば充分効果があった。こ
れは導光板１の端面で反射されて戻る主光線が出光面５
に到達する最長距離ｔは、導光板１の臨界角を考慮すれ
ば、ｔ＝ｄ・ｃｏｔ（ｓｉｎー1（１／Ｎ）） で与えら
れるためである。ここでＮは導光板１の平均屈折率であ
る。なお、端面１０の外側に端面反射板２０を配置すれ
ば効率が向上するのは言うまでもない。FIG. 3 is a sectional view showing another embodiment of the surface lighting device of the present invention, in which a diffusion surface 12 is arranged near the end face 10. In this case, the light reflected by the end surface 10 and returning to the diffused surface 12 becomes diffused light, so that a regular beat of light cannot be generated. The diffusing surface 12 is preferably roughened by sanding the light guide plate 1 or the like, and the width (t in the figure) of the processed surface is the end face 10 of the light guide plate 1.
If the thickness is almost equal to the thickness d in the part, the effect is sufficiently obtained. This is because the principal ray reflected by the end surface of the light guide plate 1 and returning is the light exit surface 5
This is because the longest distance t to reach is given by t = d · cot (sin -1 (1 / N)) in consideration of the critical angle of the light guide plate 1. Here, N is the average refractive index of the light guide plate 1. It goes without saying that the efficiency is improved by disposing the end face reflection plate 20 outside the end face 10.
【００１４】図４は本発明の面照明装置の他の実施例を
示す断面図であり、端面１０は曲面で形成されている。
この曲面の形状は円筒面、楕円面、放物面などが好適で
あったが、そもそも曲面で形成する目的は端面１０に入
射する光線をランダムな方向に戻してやることであるか
らこれに限らず他の自由曲面でもかまわない。なお、端
面１０の外側に端面反射板２０を配置すれば導光板の効
率は向上する。又、入射端面７を曲面で形成すると光の
入射効率が低下して照明輝度が下がってしまうため、入
射端面７近傍で発生する光のビートに対しては図１ある
いは図３あるいは以下に述べる図５の方法を併用して対
策するのが効果的であった。FIG. 4 is a sectional view showing another embodiment of the surface lighting device of the present invention, in which the end surface 10 is formed as a curved surface.
The shape of this curved surface was preferably a cylindrical surface, an elliptical surface, a parabolic surface, or the like, but the purpose of forming a curved surface is to return the light rays incident on the end surface 10 in random directions, and is not limited to this. Other free-form surfaces may be used. The efficiency of the light guide plate is improved by disposing the end face reflection plate 20 outside the end face 10. Further, if the incident end face 7 is formed into a curved surface, the incident efficiency of light is reduced and the illumination brightness is lowered. Therefore, with respect to the beat of light generated near the incident end face 7, FIG. 1 or FIG. It was effective to take countermeasures by using the method of 5 together.
【００１５】図５は本発明の面照明装置の更に他の実施
例を示す断面図であり、端面１０には透明部材１３を密
着させてある。端面１０に到達した光線は反射せずその
まま進行し透明部材１３の端面１４で反射して戻るた
め、主光線はその光路長の分だけずれた位置に到達する
ことになる。従ってこの場合もやはり縞模様状の光のビ
ートは発生しないことになる。実際のテストで透明部材
１３の長さＬを種々の値に設定したところＬ＝ｄ（ｎ−
０．５）の場合は光のビートの発生が確認された。従っ
て、Ｌ≠ｄ（ｎ−０．５）に設定する必要がある。ここ
でｄは導光板端面での厚みを、ｎは自然数を示すもので
ある。透明部材１３には透明なＰＭＭＡなどが好適であ
り、透明部材端面１４に端面反射板２０を配置すれば導
光板効率は向上するものである。透明部材１３の長さＬ
に関わらず光のビートの発生を抑えようとする場合は透
明部材端面１４を拡散面とすればよい。なお、上述した
ように入射端面７の近傍にもわずかに光のビートのでる
場合があり、その場合は入射端面にも透明部材１３を密
着させるのが効果的であった。FIG. 5 is a sectional view showing still another embodiment of the surface lighting device of the present invention, in which a transparent member 13 is closely attached to the end face 10. The light ray that has reached the end surface 10 does not reflect, travels as it is, and is reflected by the end surface 14 of the transparent member 13 and returns, so that the principal ray reaches a position displaced by the optical path length. Therefore, in this case as well, the beat of light having a striped pattern does not occur. When the length L of the transparent member 13 was set to various values in an actual test, L = d (n-
In the case of 0.5), generation of light beat was confirmed. Therefore, it is necessary to set L ≠ d (n−0.5). Here, d is the thickness at the end face of the light guide plate, and n is a natural number. Transparent PMMA or the like is suitable for the transparent member 13, and the light guide plate efficiency is improved by disposing the end face reflection plate 20 on the end face 14 of the transparent member. Length L of transparent member 13
Regardless of the generation of light beats, the transparent member end surface 14 may be a diffusion surface. As described above, there may be a slight light beat near the incident end face 7, in which case it was effective to bring the transparent member 13 into close contact with the incident end face.
【００１６】[0016]
【発明の効果】本発明によると、以上説明したように、
導光板端面の全てあるいは一部を拡散面にする、または
光源の配置されない全てのあるいは一部の端面に光を吸
収する部材を密着させる、または導光板の全てのあるい
は一部の端面の近傍を拡散面とする、または一部の導光
板端面を曲面で形成する、または全てのあるいは一部の
導光板端面に透明部材を密着させることにより、ミクロ
相分離した不均一構造を形成してなるポリマー導光板と
その端面に配置した光源を有する面照明装置を点灯した
場合に導光板の端面近くに出現する不愉快な縞模様状の
光ビートの発生を抑える事ができる。これにより基本的
に効率の良い面照明装置の照明品位を大幅に向上するこ
とができるという大きな効果を有するものである。According to the present invention, as described above,
All or part of the end surface of the light guide plate is made to be a diffusion surface, or a member that absorbs light is adhered to all or part of the end surface where the light source is not arranged, or near all or part of the end surface of the light guide plate. Polymer that forms a non-uniform structure with microphase separation by using a diffusion surface, forming a part of the end surface of the light guide plate with a curved surface, or adhering a transparent member to all or part of the end surface of the light guide plate. It is possible to suppress the generation of an unpleasant striped optical beat that appears near the end surface of the light guide plate when the surface lighting device having the light guide plate and the light source arranged on the end surface thereof is turned on. This has a great effect that the illumination quality of the efficient surface illumination device can be significantly improved.
【図１】 本発明の面照明装置の一実施例を示す断面
図。FIG. 1 is a sectional view showing an embodiment of a surface lighting device of the present invention.
【図２】 本発明の面照明装置の他の実施例を示す断面
図。FIG. 2 is a sectional view showing another embodiment of the surface lighting device of the present invention.
【図３】 本発明の面照明装置の他の実施例を示す断面
図。FIG. 3 is a sectional view showing another embodiment of the surface lighting device of the present invention.
【図４】 本発明の面照明装置の他の実施例を示す断面
図。FIG. 4 is a sectional view showing another embodiment of the surface lighting device of the present invention.
【図５】 本発明の面照明装置の他の実施例を示す断面
図。FIG. 5 is a cross-sectional view showing another embodiment of the surface lighting device of the present invention.
【図６】 従来の技術による面照明装置の斜視図。FIG. 6 is a perspective view of a conventional surface lighting device.
【図７】 縞模様状の光ムラが発生する原理を説明する
図。FIG. 7 is a diagram illustrating the principle of occurrence of striped light unevenness.
１ 導光板 ２ 光源 ３ リフレクター ４ 反射板 ５ 出光面 ７ 入射端面 １０ 端面 １１ 光吸収部材 １２ 拡散面 １３ 透明部材 １４ 透明部材端面 ２０ 端面反射板 １００ 楔形導光板１ １０１ 楔形導光板２ DESCRIPTION OF SYMBOLS 1 Light guide plate 2 Light source 3 Reflector 4 Reflecting plate 5 Light emitting surface 7 Incident end face 10 End face 11 Light absorbing member 12 Diffusing surface 13 Transparent member 14 Transparent member end face 20 End face reflecting plate 100 Wedge-shaped light guide plate 1 101 Wedge-shaped light guide plate 2
Claims (5)
なるポリマー導光板と前記導光板の端面に配置された光
源とを有する面照明装置において、前記導光板の全ての
あるいは一部の端面を拡散面としたことを特徴とする面
照明装置。1. A surface illuminator having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged at an end face of the light guide plate, wherein all or a part of the end faces of the light guide plate. A surface lighting device characterized in that
なるポリマー導光板と前記導光板の端面に配置された光
源とを有する面照明装置において、光源が配置されない
全てのあるいは一部の端面に光を吸収する部材を密着さ
せたことを特徴とする面照明装置。2. A surface lighting device having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged at an end face of the light guide plate, wherein all or a part of the end face where no light source is arranged. A surface lighting device characterized in that a member for absorbing light is closely attached to the surface.
なるポリマー導光板と前記導光板の端面に配置された光
源とを有する面照明装置において、前記導光板の全ての
あるいは一部の端面の近傍を拡散面としたことを特徴と
する面照明装置。3. A surface illuminating device having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged at an end face of the light guide plate, wherein all or part of the end face of the light guide plate. A surface lighting device characterized in that the vicinity of is a diffusion surface.
なるポリマー導光板と前記導光板の端面に配置された光
源とを有する面照明装置において、前記導光板の一部の
端面を曲面で形成したことを特徴とする面照明装置。4. A surface illuminating device having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged at an end face of the light guide plate, wherein a part of the end face of the light guide plate is curved. A surface lighting device characterized by being formed.
なるポリマー導光板と前記導光板の端面に配置された光
源とを有する面照明装置において、前記導光板の全ての
あるいは一部の端面に透明部材を密着せしめてなること
を特徴とする面照明装置。5. A surface illuminating device having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged at an end face of the light guide plate, wherein all or part of the end face of the light guide plate. A surface lighting device characterized in that a transparent member is closely adhered to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23840492A JP3240703B2 (en) | 1992-09-07 | 1992-09-07 | Surface lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23840492A JP3240703B2 (en) | 1992-09-07 | 1992-09-07 | Surface lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0682631A true JPH0682631A (en) | 1994-03-25 |
| JP3240703B2 JP3240703B2 (en) | 2001-12-25 |
Family
ID=17029704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23840492A Expired - Fee Related JP3240703B2 (en) | 1992-09-07 | 1992-09-07 | Surface lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3240703B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11134918A (en) * | 1997-03-04 | 1999-05-21 | Matsushita Electric Ind Co Ltd | Linear lighting system |
| JP2006004877A (en) * | 2004-06-21 | 2006-01-05 | Nippon Leiz Co Ltd | Light guide plate, and flat illumination device |
| JP2009043663A (en) * | 2007-08-10 | 2009-02-26 | Minebea Co Ltd | Planar luminaire |
| JP2010086816A (en) * | 2008-09-30 | 2010-04-15 | Showa Denko Kk | Display and light emitting device |
| JP2010243959A (en) * | 2009-04-09 | 2010-10-28 | Showa Denko Kk | Display and light source device |
| KR20150108215A (en) * | 2014-03-17 | 2015-09-25 | 엘지이노텍 주식회사 | Lighting member using side reflection and lighting device using the same |
| WO2016060052A1 (en) * | 2014-10-15 | 2016-04-21 | シャープ株式会社 | Lighting device, display device and method for manufacturing lighting device |
| JP2017195163A (en) * | 2016-04-22 | 2017-10-26 | 川崎重工業株式会社 | Light guide plate and surface lighting device |
| JP2018518031A (en) * | 2015-06-16 | 2018-07-05 | スリーエム イノベイティブ プロパティズ カンパニー | Light guide with anti-reflection mechanism |
-
1992
- 1992-09-07 JP JP23840492A patent/JP3240703B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11134918A (en) * | 1997-03-04 | 1999-05-21 | Matsushita Electric Ind Co Ltd | Linear lighting system |
| JP2006004877A (en) * | 2004-06-21 | 2006-01-05 | Nippon Leiz Co Ltd | Light guide plate, and flat illumination device |
| JP2009043663A (en) * | 2007-08-10 | 2009-02-26 | Minebea Co Ltd | Planar luminaire |
| JP2010086816A (en) * | 2008-09-30 | 2010-04-15 | Showa Denko Kk | Display and light emitting device |
| JP2010243959A (en) * | 2009-04-09 | 2010-10-28 | Showa Denko Kk | Display and light source device |
| KR20150108215A (en) * | 2014-03-17 | 2015-09-25 | 엘지이노텍 주식회사 | Lighting member using side reflection and lighting device using the same |
| WO2016060052A1 (en) * | 2014-10-15 | 2016-04-21 | シャープ株式会社 | Lighting device, display device and method for manufacturing lighting device |
| JPWO2016060052A1 (en) * | 2014-10-15 | 2017-07-20 | シャープ株式会社 | LIGHTING DEVICE, DISPLAY DEVICE, AND LIGHTING DEVICE MANUFACTURING METHOD |
| US10345504B2 (en) | 2014-10-15 | 2019-07-09 | Sharp Kabushiki Kaisha | Lighting device, display device, and method of manufacturing lighting device |
| JP2018518031A (en) * | 2015-06-16 | 2018-07-05 | スリーエム イノベイティブ プロパティズ カンパニー | Light guide with anti-reflection mechanism |
| JP2017195163A (en) * | 2016-04-22 | 2017-10-26 | 川崎重工業株式会社 | Light guide plate and surface lighting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3240703B2 (en) | 2001-12-25 |
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