JPH04107201U - light guide plate device - Google Patents
light guide plate deviceInfo
- Publication number
- JPH04107201U JPH04107201U JP983891U JP983891U JPH04107201U JP H04107201 U JPH04107201 U JP H04107201U JP 983891 U JP983891 U JP 983891U JP 983891 U JP983891 U JP 983891U JP H04107201 U JPH04107201 U JP H04107201U
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light guide
- film
- prism
- 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
- 238000009792 diffusion process Methods 0.000 claims abstract description 17
- 238000002834 transmittance Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920006289 polycarbonate film Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
(57)【要約】
【目的】 導光板1 の面上の輝度値を大幅に高くした導
光板装置を提供することを目的とする。
【構成】 拡散フィルム9 の表面側に、断面の形状が頂
角R75 °〜90°の二等三角形である多数の突条部11が波
形に並ぶプリズム面12を表面上に有するプリズムフィル
ム10を設け、突条部11の高さb を、プリズムフィルム11
の厚みa に対して略１／３に構成させている。
【効果】 各突条部11からプリズム面12上に一方向性及
び一定角度をもって集光され、発光されるので高輝度を
有する導光板装置となる。
(57) [Summary] [Purpose] The purpose is to provide a light guide plate device in which the luminance value on the surface of the light guide plate 1 is significantly increased. [Structure] A prism film 10 is provided on the front side of the diffusion film 9, which has a prism surface 12 on which a large number of protrusions 11 whose cross section is an isometric triangle with an apex angle of R75° to 90° are arranged in a waveform. The prism film 11 has a height b of the protrusion 11.
The thickness is approximately 1/3 of the thickness a. [Effect] Light is collected from each protrusion 11 onto the prism surface 12 in one direction and at a certain angle, and is emitted, resulting in a light guide plate device with high brightness.
Description
【０００１】0001
本考案は、液晶テレビ、パソコン等のディスプレイに使用するバックライトや 看板のバックライト、又は照明器具として用いられる導光板装置に関する。 This invention is designed for backlights used in displays such as LCD TVs and personal computers. The present invention relates to a light guide plate device used as a backlight for a signboard or a lighting fixture.
【０００２】0002
従来のエッジライト式導光板装置は、図４で示すようにアクリル樹脂等からな る導光板21を備え、この導光板21はエッジ部から入射した光を反射、遮光させる ための反射面23と、前記光を発光させるための発光面24とを有し、前記反射面23 側にはポリエチレンフィルムの内面に銀蒸着フィルムを貼付した遮光シート25が 貼付され、その表面には光を均一にするために傷やスクリーン印刷等の加工26が 施され、また、発光面24には光を拡散させるための拡散フィルム29が貼付され、 この拡散フィルム29の表面にはエンボス加工（シボ加工）30等が施されたり、更 にその上に拡散フィルム29が設けられているものがあった。 Conventional edge-lit light guide plate devices are made of acrylic resin, etc., as shown in Figure 4. This light guide plate 21 reflects and blocks light incident from the edge portion. and a light emitting surface 24 for emitting the light, the reflecting surface 23 On the side is a light-shielding sheet 25 made of polyethylene film with a silver vapor-deposited film attached to the inner surface. It is pasted, and its surface has scratches and processes such as screen printing26 to make the light uniform. In addition, a diffusion film 29 for diffusing light is attached to the light emitting surface 24, The surface of this diffusion film 29 is embossed (textured) 30, etc. There was one on which a diffusion film 29 was provided.
【０００３】0003
上記導光板装置は、前記拡散フィルム29やエンボス加工30等により光が各方面 に広がりすぎて、前面に出てくる光が少なく、輝度値がかなり低下する。 The above-mentioned light guide plate device allows light to be directed in all directions by the above-mentioned diffusion film 29, embossing 30, etc. The area spreads out too much, so less light comes out to the front, and the brightness value drops considerably.
【０００４】 そこで、本考案では導光板の面上の輝度値を大幅に高くした導光板装置を提供 することを目的としている。0004 Therefore, in this invention, we provide a light guide plate device that significantly increases the brightness value on the surface of the light guide plate. It is intended to.
【０００５】[0005]
本考案は、上記目的を達成するために、次の技術的手段を講じる。 The present invention takes the following technical measures to achieve the above object.
【０００６】 即ち、一面を反射面3 とし、他面を発光面4 とした導光板1 を備え、発光面4 側には、透過率の高い半透明の拡散フィルム9 を設け、導光板1 の側端面から光 源2 の光を導光板1 に入射し、その光を反射面3 で反射させて発光面4 側を発光 させるようにした導光板装置において、前記拡散フィルム9 の表面側に、多数の 突条部11が波形に並ぶプリズム面12を表面上に有するプリズムフィルム10が設け られていることを特徴としている。[0006] That is, it is equipped with a light guide plate 1 having one surface as a reflective surface 3 and the other surface as a light emitting surface 4. A semi-transparent diffusion film 9 with high transmittance is provided on the side, and light is transmitted from the side end surface of the light guide plate 1. Light from source 2 enters light guide plate 1, the light is reflected by reflective surface 3, and light is emitted from light emitting surface 4. In the light guide plate device, a large number of light guide plates are provided on the surface side of the diffusion film 9. A prism film 10 is provided which has a prism surface 12 on the surface of which protrusions 11 are arranged in a waveform. It is characterized by being
【０００７】[0007]
本考案に係る導光板装置では、導光板1 のエッジ部から入射した光は反射等を 経て、拡散フィルム9 により拡散される。 In the light guide plate device according to the present invention, light incident from the edge of the light guide plate 1 is not subject to reflection, etc. Then, it is diffused by a diffusion film 9.
【０００８】 拡散された光は次にプリズム面12内に入射し、図２の矢印で示すように各突条 部11からプリズム面12の傾斜角内で一方向性及び一定角度をもって発光される。[0008] The diffused light then enters the prism surface 12, and as shown by the arrow in FIG. Light is emitted from the portion 11 with unidirectionality and at a constant angle within the inclination angle of the prism surface 12.
【０００９】[0009]
以下、図面に基いて本考案の実施例を詳述する。 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
【００１０】 本考案に係る導光板装置は図１及び図２で示すようにアクリル樹脂、ポリカー ビネイト、ＡＳ，ＰＥＴ等の光透過率の良い透明樹脂より構成された導光板1 と 、その両側端部に配置されたランプ等の光源2 とを備えている。0010 The light guide plate device according to the present invention is made of acrylic resin, polycarbonate, etc., as shown in FIGS. 1 and 2. A light guide plate 1 made of transparent resin with good light transmittance such as Vinate, AS, PET, etc. , and light sources 2 such as lamps arranged at both ends thereof.
【００１１】 前記導光板1 の一面は反射面3 とされ、他面は発光面4 とされており、前記反 射面3 側には光漏れ防止のために例えばポリエチレンフィルムの内面に銀蒸着フ ィルムを貼付した遮光シート5 を貼りつけると共に、光を乱反射させるために傷 やスクリーン印刷等の散点状加工6 が施されている。[0011] One surface of the light guide plate 1 is a reflective surface 3, and the other surface is a light emitting surface 4. For example, a silver vapor-deposited film is placed on the inner surface of the polyethylene film on the radiation surface 3 side to prevent light leakage. In addition to attaching a light-shielding sheet 5 with a film attached, it is also scratched to diffuse the light. It has been subjected to dot-like processing6 such as screen printing.
【００１２】 又、前記導光板1 から光源2 の外周を覆って例えば塩化ビニルフィルム等の遮 光用カバー7 が設けられており、その内面には銀色或いは金色着色箔、アルミ箔 、アルミコート銀紙、アルミコートフィルム等の金属蒸着シート8 が貼付されて いる。0012 Further, a shielding material such as a vinyl chloride film is provided to cover the outer periphery of the light source 2 from the light guide plate 1. A light cover 7 is provided, and its inner surface is coated with silver or gold colored foil or aluminum foil. , aluminum-coated silver paper, aluminum-coated film, or other metal-deposited sheets8 are attached. There is.
【００１３】 一方、発光面4 上には前記スクリーン印刷等の加工6 構造が映らないように透 過率の高い半透明のポリカーボネイトフィルムを一枚或いは複数枚重合状にした 拡散フィルム9 が設けられている。[0013] On the other hand, on the light-emitting surface 4, the above-mentioned processing such as screen printing 6 is applied so that the structure is not reflected. Polymerized one or more translucent polycarbonate films with high transparency A diffusion film 9 is provided.
【００１４】 上記拡散フィルム9 の表面側には、プリズムフィルム10が設けられ、このプリ ズムフィルム10の表面上は多数の突条部11が波形に並ぶプリズム面12となってい る。そして、このプリズムフィルム10は前記拡散フィルム9 によって拡散された 光を集光し、一方向性及び一定角度をもって発光させる。[0014] A prism film 10 is provided on the front side of the diffusion film 9. On the surface of the prism film 10, a large number of protrusions 11 form a prism surface 12 arranged in a waveform. Ru. This prism film 10 is then diffused by the diffusion film 9. It condenses light and emits it unidirectionally and at a fixed angle.
【００１５】 前記プリズムフィルム10を構成する突条部11の断面の形状は頂角R が75°〜90 °に精密にカットされた二等辺三角形であることが好ましく、精密さが増すほど 輝度ムラを防止することができる。また、この角度はフィルム10の材質によって 屈折率が違うのでそれに対じて選択する。[0015] The cross-sectional shape of the protruding portion 11 constituting the prism film 10 has an apex angle R of 75° to 90°. It is preferable that it is an isosceles triangle precisely cut to °, and the more precise the It is possible to prevent uneven brightness. Also, this angle depends on the material of the film 10. Since the refractive index is different, select accordingly.
【００１６】 尚、前記頂角R が75°より小さいと各突条部11の間隔が狭くなりすぎて光の入 射範囲が狭くなり、光量が減少してしまうので好ましくなく、角度が大きいほう が輝度は高くなるが、頂角R が90°より大きいと前方に集光させる効率が極端に 低下するので好ましくない。[0016] Note that if the apex angle R is smaller than 75°, the spacing between the protrusions 11 will be too narrow and light will not enter. This is undesirable because the radiation range becomes narrower and the amount of light decreases, so a larger angle is preferable. Although the brightness will be higher, if the apex angle R is larger than 90°, the efficiency of focusing the light forward will be extremely low. This is not preferable because it lowers the temperature.
【００１７】 前記プリズムフィルム10は光拡散集光効果を上げるために、その厚みa を0.4m m 以上とし、また、前記突条部9 の高さb を1 mm以下で、且つ幅c を2 mm以下に するとよい。[0017] The thickness a of the prism film 10 is set to 0.4 m in order to improve the light diffusion and convergence effect. m or more, and the height b of the protrusion 9 is 1 mm or less, and the width c is 2 mm or less. It's good to do that.
【００１８】 又、上記同様光拡散集光効果を上げるためには、更に前記突条部11の高さb を 、この突条部11の幅c に対して１／３〜１／２にするとよい。又、突条部11の高 さb をプリズムフィルム10の厚みa に対して略１／３にするとよい。[0018] Furthermore, in order to increase the light diffusion and convergence effect as described above, the height b of the protrusion 11 should be further increased. , it is preferable to set the width c to 1/3 to 1/2 of the width c of the protrusion 11. Also, the height of the protruding portion 11 It is preferable that sb be approximately 1/3 of the thickness a of the prism film 10.
【００１９】 上記範囲から外れると入射した光がプリズム面12から発光できずに再びプリズ ムフィルム10内に反射されてしまい発光効率が低下し、高輝度が得られなくなる 。[0019] If it falls outside the above range, the incident light will not be able to emit from the prism surface 12 and will re-enter the prism. The light is reflected within the film 10, reducing luminous efficiency and making it impossible to obtain high brightness. .
【００２０】 更に、前記突条部11が前記光源2 の配置されている方向に対して直行する方向 に設置されると、視野角が広くなりよい。[0020] Furthermore, the protruding portion 11 is arranged in a direction perpendicular to the direction in which the light source 2 is arranged. The viewing angle can be widened if the camera is installed in
【００２１】 次に、図１及び図２で示す本考案の実施例と図４で示す従来例との輝度測定結 果を説明する。[0021] Next, the luminance measurement results of the embodiment of the present invention shown in FIGS. 1 and 2 and the conventional example shown in FIG. Explain the results.
【００２２】 尚、本考案の実施例と従来例での導光板装置は、導光板の素材、全体の厚みと 大きさ及び光源の種類・個数・強さについて互いに同一であるものを比較したも のであり、使用した導光板装置は以下に記すようなものである。[0022] In addition, the light guide plate device in the embodiment of the present invention and the conventional example differ in the material of the light guide plate, the overall thickness, and A comparison of items that are the same in size, type, number, and intensity of light sources. The light guide plate device used was as described below.
【００２３】 〈第１比較測定〉 全体の厚み ：6.0 mm 全体の大きさ ：270 mm × 180mm 光源の種類・個数 ：短辺入光, 冷陰極放電管２本 突条部の頂角R ：90° 突条部の高さb ：0.25mm 突条部の幅c ：0.5 mm プリズムフィルムの厚みａ：0.8 mm[0023] <First comparison measurement> Overall thickness: 6.0 mm Overall size: 270 mm × 180 mm Type and number of light sources: Short side light incident, 2 cold cathode discharge tubes Apex angle R of protrusion: 90° Projection height b: 0.25mm Protrusion width c: 0.5 mm Prism film thickness a: 0.8 mm
【００２４】 〈第２比較測定〉 全体の厚み ：5.0 mm 全体の大きさ ：270 mm × 200mm 光源の種類・個数 ：短辺入光, 冷陰極放電管２本 突条部の頂角R ：80° 突条部の高さb ：0.25mm 突条部の幅c ：0.4 mm プリズムフィルムの厚みａ：0.8 mm[0024] <Second comparison measurement> Overall thickness: 5.0 mm Overall size: 270mm x 200mm Type and number of light sources: Short side light incident, 2 cold cathode discharge tubes Apex angle R of protrusion: 80° Projection height b: 0.25mm Protrusion width c: 0.4 mm Prism film thickness a: 0.8 mm
【００２５】 上記のように、突条部の頂角R の異なる２種類の導光板装置を用いて、第１輝 度比較測定及び第２輝度比較測定を、図３に示す有効発光面上の縦軸Ｉ，II，II I と横軸Ｘ，Ｙ，Ｚとの各交点９点にて行い、その平均輝度を指数で示すと下記 表のようになる。[0025] As mentioned above, two types of light guide plate devices with different apex angles R of the protrusions are used to The brightness comparison measurement and the second brightness comparison measurement are performed on the vertical axes I, II, II on the effective light emitting surface shown in FIG. Performed at each of the nine intersections of I and the horizontal axes X, Y, and Z, and the average brightness expressed as an index is as follows. It will look like a table.
【００２６】 尚、表内の数値の単位はcd/m2 である。[0026] The unit of numerical values in the table is cd/ m2 .
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【表２】 [Table 2]
【００２９】 上記表の第１比較測定結果、実施例での全体平均輝度が７４５cd/m2 、従来例 での全体平均輝度が５５０cd/m2 を示し、３５．４％も輝度が高くなったことが わかる。[0029] The first comparative measurement results in the above table show that the overall average brightness in the example was 745 cd/m 2 and the overall average brightness in the conventional example was 550 cd/m 2 , which was a 35.4% increase in brightness. I understand that.
【００３０】 同様に第２比較測定結果、実施例での全体平均輝度が５７２cd/m2 、従来例で の全体平均輝度が４６１cd/m2 を示し、２４．０％も輝度が高くなったことがわ かる。Similarly, the second comparative measurement results showed that the overall average brightness in the example was 572 cd/m 2 and the overall average brightness in the conventional example was 461 cd/m 2 , indicating that the brightness was 24.0% higher. I understand.
【００３１】 尚、上記導光板装置では導光板1 の両側端部に光源2 を設けたが、一側端部の みを入射面とし、他側端部は光を遮光する遮光面として光源2 を設けていないも のであってもよい。[0031] In the above light guide plate device, the light sources 2 are provided at both ends of the light guide plate 1, but the light sources 2 are provided at both ends of the light guide plate 1. The other end is used as a light-shielding surface that blocks light, even if no light source 2 is provided. It may be.
【００３２】[0032]
本考案の導光板装置は、拡散フィルム9 の表面側に、多数の突条部11が波形に 並ぶプリズム面12を表面上に有するプリズムフィルム10が設けられ、各突条部11 からプリズム面12上に一方向性及び一定角度をもって集光発光されるので高輝度 を有する導光板装置となった。 In the light guide plate device of the present invention, a large number of protrusions 11 are formed in a corrugated manner on the surface side of the diffusion film 9. A prism film 10 having juxtaposed prism surfaces 12 on its surface is provided, and each protrusion 11 The light is emitted unidirectionally and condensed at a certain angle onto the prism surface 12, resulting in high brightness. It became a light guide plate device with.
【図面の簡単な説明】[Brief explanation of drawings]
【図１】本考案の実施例を示す斜視概略図である。FIG. 1 is a schematic perspective view showing an embodiment of the present invention.
【図２】同一部断面拡大図である。FIG. 2 is an enlarged cross-sectional view of the same part.
【図３】同輝度の測定箇所を示す正面図である。FIG. 3 is a front view showing locations where the same luminance is measured.
【図４】従来例を示す一部断面拡大図である。FIG. 4 is an enlarged partial cross-sectional view showing a conventional example.
１ 導光板 ２ 光源 ３ 反射面 ４ 発光面 ９ 拡散フィルム １０ プリズムフィルム １１ 突条部 １２ プリズム面 Ｒ 突条部の頂角 ａ プリズムフィルムの厚み ｂ 突条部の高さ ｃ 突条部の幅 1 Light guide plate 2 Light source 3 Reflective surface 4 Light emitting surface 9 Diffusion film 10 Prism film 11 Projection part 12 Prism surface R Apex angle of protrusion a Thickness of prism film b Height of the protrusion c Width of the protrusion
Claims (3)
(4) とした導光板(1)を備え、発光面(4) 側には、透過
率の高い半透明の拡散フィルム(9) を設け、導光板(1)
の側端面から光源(2) の光を導光板(1) に入射し、その
光を反射面(3)で反射させて発光面(4) 側を発光させる
ようにした導光板装置において、前記拡散フィルム(9)
の表面側に、多数の突条部(11)が波形に並ぶプリズム面
(12)を表面上に有するプリズムフィルム(10)が設けられ
ていることを特徴とする導光板装置。[Claim 1] One side is a reflective surface (3) and the other side is a light emitting surface.
(4) A translucent diffusion film (9) with high transmittance is provided on the light emitting surface (4) side, and the light guide plate (1)
In the light guide plate device, the light from the light source (2) is incident on the light guide plate (1) from the side end surface of the light guide plate (1), and the light is reflected by the reflecting surface (3) to cause the light emitting surface (4) side to emit light. Diffusion film(9)
A prism surface with many protrusions (11) lined up in a waveform on the surface side.
1. A light guide plate device comprising: a prism film (10) having (12) on its surface.
が75°〜90°の二等辺三角形であることを特徴とする請
求項１に記載の導光板装置。[Claim 2] The cross-sectional shape of the protrusion (11) has an apex angle (R).
The light guide plate device according to claim 1, wherein the angle is an isosceles triangle of 75° to 90°.
ズムフィルム(10)の厚み(a) に対して略１／３であるこ
とを特徴とする請求項１に記載の導光板装置。3. The height (b) of the protrusion (11) is approximately 1/3 of the thickness (a) of the prism film (10). light guide plate device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP983891U JPH04107201U (en) | 1991-02-27 | 1991-02-27 | light guide plate device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP983891U JPH04107201U (en) | 1991-02-27 | 1991-02-27 | light guide plate device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04107201U true JPH04107201U (en) | 1992-09-16 |
Family
ID=31900043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP983891U Pending JPH04107201U (en) | 1991-02-27 | 1991-02-27 | light guide plate device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04107201U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05323319A (en) * | 1992-05-18 | 1993-12-07 | Tosoh Corp | Back light |
| JPH06102507A (en) * | 1992-09-24 | 1994-04-15 | Mitsubishi Rayon Co Ltd | Liquid crystal display device |
| JPH06342161A (en) * | 1994-03-24 | 1994-12-13 | Tosoh Corp | Back light |
| WO1995012827A1 (en) * | 1993-11-05 | 1995-05-11 | Enplas Corporation | Surface light source device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4107237B2 (en) * | 2004-01-16 | 2008-06-25 | 株式会社デンソーウェーブ | Method for identifying boundary position of optical information reader |
-
1991
- 1991-02-27 JP JP983891U patent/JPH04107201U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4107237B2 (en) * | 2004-01-16 | 2008-06-25 | 株式会社デンソーウェーブ | Method for identifying boundary position of optical information reader |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05323319A (en) * | 1992-05-18 | 1993-12-07 | Tosoh Corp | Back light |
| JPH06102507A (en) * | 1992-09-24 | 1994-04-15 | Mitsubishi Rayon Co Ltd | Liquid crystal display device |
| WO1995012827A1 (en) * | 1993-11-05 | 1995-05-11 | Enplas Corporation | Surface light source device |
| JPH06342161A (en) * | 1994-03-24 | 1994-12-13 | Tosoh Corp | Back light |
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