JPS61133502A - Surface light source unit - Google Patents
Surface light source unitInfo
- Publication number
- JPS61133502A JPS61133502A JP25595484A JP25595484A JPS61133502A JP S61133502 A JPS61133502 A JP S61133502A JP 25595484 A JP25595484 A JP 25595484A JP 25595484 A JP25595484 A JP 25595484A JP S61133502 A JPS61133502 A JP S61133502A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- transmitting plate
- diffusing
- treatment
- 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
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は面光源装置に関し、更に詳細には液晶表示素
子の背面照明光源、広告灯あるいけ各種の露光装置など
に用いる面光源装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a surface light source device, and more particularly to a surface light source device used for backlighting light sources for liquid crystal display elements, advertising lights, and various exposure devices.
第２図は例えば特公昭５９−８８０９号公報に示された
従来の面光源装置の断面図であり、図において１は光反
射体、２は光反射体１の前方に配置された光源、３は光
源２の前方に配置された光拡散透過板、４は光源２と光
拡散透過板３０間に配置され、光源２に近いところ程密
度が高くなるように分布させて光反射性処理４ａを施こ
した不均一光透過板である。FIG. 2 is a sectional view of a conventional surface light source device disclosed in, for example, Japanese Patent Publication No. 59-8809. In the figure, 1 is a light reflector, 2 is a light source disposed in front of the light reflector 1, and 3 4 is a light diffusing and transmitting plate disposed in front of the light source 2, and 4 is disposed between the light source 2 and the light diffusing and transmitting plate 30, and the light reflective treatment 4a is distributed so that the density becomes higher nearer to the light source 2. This is a non-uniform light transmitting plate.
次に動作について説明する。光源２を出た光は、前述の
各構成要素のそれぞれによって、反射、透過、屈折など
を幾度かうつ繰返した後に光拡散透過板３の前方−・出
射される。Next, the operation will be explained. The light emitted from the light source 2 undergoes reflection, transmission, refraction, etc. several times by each of the above-mentioned components, and then is emitted from the front of the light diffusing and transmitting plate 3.
この過程において、不均一光透過板４の光源２に近いと
ころ程高い密度で施こされた光反射性処理のため、光源
２から直接に光拡散透過板３へ向かおうとする光の幾ら
かは阻止（反射）される。In this process, some of the light that tries to go directly from the light source 2 to the light diffusing and transmitting plate 3 due to the light reflective treatment applied to the non-uniform light transmitting plate 4 at a higher density closer to the light source 2. is blocked (reflected).
阻止（反射）される割合は光源２に近いところ程大きい
ので、光拡散透過板３の光源２に近いところ程高い照度
で照らされることが避られる。そのため、光拡散透過板
３からは、より均一な強度分布の光が前方へ出射される
。Since the proportion of light that is blocked (reflected) is greater in areas closer to the light source 2, areas of the light diffusing and transmitting plate 3 closer to the light source 2 are prevented from being illuminated with higher illuminance. Therefore, light with a more uniform intensity distribution is emitted forward from the light diffusing and transmitting plate 3.
この場合、光拡散透過板３の位置に対する不均一光透過
板３或いは光源２の位置が所定の場所からずれると、光
源２から遠いところへ光反射性処理４ａの高密度部分が
移動したり、密度の変化が相対的に急激になったり又は
穏やかになったりするので、出射光の強度分布は相対的
に不均一となる。In this case, if the position of the non-uniform light transmitting plate 3 or the light source 2 relative to the position of the light diffusing transmitting plate 3 deviates from a predetermined position, the high density portion of the light reflective treatment 4a may move to a place far from the light source 2, Since the change in density becomes relatively rapid or gentle, the intensity distribution of the emitted light becomes relatively non-uniform.
従来の面光源装置はこのように構成され且つ作用するの
で、不均一光透過板４を光拡散透過板３と光源２０間の
所定の位置へ比較的にｆｉｉＩ度よく配置する必要があ
った。また、装置全体に振動が加わった場合に、不均一
光透過板４がずれたり、振動したりしないように、不拘
−光透過板４自体を強固な素材で構成ｌ〜、強固に固定
する必要があった。そのため、強度を出すのに比較的に
大きくて重く、寸法精度の高い不均一光透過板４やその
固定手段としての光反射板１が必要で、高価なものとな
ったり、あまり小形にできないという問題点があった。Since the conventional surface light source device is configured and operates in this manner, it is necessary to arrange the non-uniform light transmitting plate 4 at a predetermined position between the light diffusing transmitting plate 3 and the light source 20 with relatively good precision. Furthermore, in order to prevent the uneven light transmitting plate 4 from shifting or vibrating when vibrations are applied to the entire device, the light transmitting plate 4 itself must be made of a strong material and must be firmly fixed. was there. Therefore, in order to provide strength, a relatively large and heavy non-uniform light transmitting plate 4 with high dimensional accuracy and a light reflecting plate 1 as a means for fixing it are required, which makes them expensive and cannot be made very compact. There was a problem.
この発明はかかる従来の面光源装置における問題点を解
消するためになされたもので、少々の振動が加わった程
度では、出射光の強度分布が不均一となったり、変動し
たりすることがなく、また高精度の位置合せも必要でな
い比較的に簡単軽量で安価な構成の面光源装置を得るこ
とを目的とする。This invention was made in order to solve the problems with such conventional surface light source devices, and the intensity distribution of the emitted light does not become uneven or fluctuate even if a small amount of vibration is applied. Another object of the present invention is to obtain a surface light source device having a relatively simple, lightweight, and inexpensive configuration that does not require high-precision alignment.
この発明に係る面光源装置は、光反射板の前方に光源を
配置し７、光源の前方に光拡散透過板を配置し、光源に
は表面に光反射性処理或いは光吸収性処理が分布して施
こされているものである。In the surface light source device according to the present invention, a light source is arranged in front of a light reflecting plate 7, a light diffusing and transmitting plate is arranged in front of the light source, and the light source has a light reflective treatment or a light absorbing treatment distributed on its surface. This is what is being done.
〔作 用］
このように構成されたこの発明の面光源装置によると、
光源の表面に密度を分布させて設けられた光反射性処理
或いは光吸収性処理により、光源からの出射光の配光特
性をある程度自由に設定できるように作用する。そのた
めに、光拡散透過板の任意の領域を、例えば光源から遠
いところでも近いところと同等の照度で照らしたり、或
いは、さらにある領域と他の領域とは異なる程度である
が各領域内では比較的に均一な照度で照らす作用をする
。[Function] According to the surface light source device of the present invention configured as described above,
The light reflective treatment or the light absorbing treatment provided on the surface of the light source to distribute the density acts to allow the light distribution characteristics of the light emitted from the light source to be set with some degree of freedom. To this end, it is possible to illuminate any area of the light diffusing and transmitting plate with the same illuminance even when it is far from the light source, or to illuminate it with the same illuminance as an area that is close to the light source, or even if the degree of illumination is different from one area to another, but within each area it is possible to It works to illuminate with uniform illuminance.
以下、この発明の一実施例を図について説明する。第１
図において、■は例えば白色の樹脂板からなる光反射体
、２はこの光反射体１の前方に配置された例えば棒状の
蛍光放電灯からなる光源、３は光源２の前方に配置され
た例えば乳白色のアクリル板などからなる光拡散透過板
を示している。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, ■ is a light reflector made of, for example, a white resin plate, 2 is a light source, such as a rod-shaped fluorescent discharge lamp, placed in front of the light reflector 1, and 3 is a light source, for example, placed in front of the light source 2. It shows a light diffusing and transmitting plate made of a milky white acrylic plate.
光源２はその表面に光反射性処理或いは光吸収性処理２
ａが分布して施こされている。この処理は実施例では光
源の表面に飛び飛びにプリントされたメタリックな水玉
模様である。水玉模様は実施例では直径或いは飛びのピ
ッチが徐々に変化したものとされることによって実質的
に密度が位置によって異々らされている。例えば、この
実施例では、光拡散透過板３に近いところが最も高く、
遠ざかるにつれて徐々に低くなるような光反射性処理或
いは光吸収性処理２ａを施こしている。The light source 2 has a light reflective treatment or a light absorption treatment 2 on its surface.
a is distributed and applied. In the embodiment, this process is a metallic polka dot pattern printed intermittently on the surface of the light source. In the embodiment, the diameter or pitch of the polka dots is gradually changed, so that the density is substantially varied depending on the position. For example, in this embodiment, the highest point is near the light diffusing and transmitting plate 3;
A light-reflective treatment or a light-absorbing treatment 2a is applied so that the light level gradually decreases as the distance increases.
上記のように構成された面光源装置において、光源２を
出た光は、光反射性処理或いは光吸収性処理２ａのすき
間を通り抜けた後光反射体１、光拡散透過板３および光
源２自身で幾度かうつ反射してからか或いは直接に光拡
散透過板３に至り。In the surface light source device configured as described above, the light emitted from the light source 2 passes through the gap between the light reflective treatment or the light absorbing treatment 2a, and then passes through the light reflector 1, the light diffusing and transmitting plate 3, and the light source 2 itself. The light reaches the light diffusing and transmitting plate 3 after being reflected several times or directly.
拡散透過して前方へ出射される。It is diffusely transmitted and emitted forward.
この過程において、光源２からの出射光は光拡散透過板
３に施こされた光反射性処理或いは光吸収性処理２ａの
密度分布ノソターンに応じである程度任意の照度分布で
光拡散透過板３を照射する。In this process, the light emitted from the light source 2 passes through the light diffusing and transmitting plate 3 with a certain degree of arbitrary illuminance distribution depending on the density distribution pattern of the light reflecting or absorbing treatment 2a applied to the light diffusing and transmitting plate 3. irradiate.
その照射光強度に少なくともほぼ比例した強度の光が光
拡散透過板３を拡散透過するために、面光源装置より前
方への出射光強度は前述照度分布にほぼ対ルシした分布
となる。Since light whose intensity is at least approximately proportional to the intensity of the irradiated light is diffused and transmitted through the light diffusing and transmitting plate 3, the intensity of the light emitted forward from the surface light source device has a distribution substantially corresponding to the illuminance distribution described above.
ぞのため、結局、出射光の強度分布は光源２に施こす光
反射性処理２ａによりある程度任意のものとできる。例
えば、実施例では光反射性処理２ａ奢光拡散透過板３に
近いところだけ高い密度としているので光源２から光拡
散透過板３へ向がおうとする光の中、光源２を起点とし
て光拡散透過板３に近いところへ向かおうとするものほ
ど高い割合で１羽虫（反射）され、無処理の場合に起と
る光拡散透過板３の光源２に近いところでの強い照射ひ
いては部分的な輝きが避けられて相対的に均一な分布で
発光する。Therefore, the intensity distribution of the emitted light can be made arbitrary to some extent by the light reflective treatment 2a applied to the light source 2. For example, in the embodiment, the light reflective treatment 2a has a high density only in the areas close to the light diffusing and transmitting plate 3, so that among the light that is going from the light source 2 to the light diffusing and transmitting plate 3, light is diffused and transmitted starting from the light source 2. The closer the light source 2 is to the plate 3, the higher the rate at which the insects are reflected (reflected), and the strong irradiation of the light diffusing and transmitting plate 3 near the light source 2, which would otherwise occur without treatment, is avoided. and emit light in a relatively uniform distribution.
前記実施例では全面均一発光を得る場合について示した
が、高度な実施例として光拡散透過板３を任意の複数の
領域に分け、各領域について、光源２の光拡散透過板３
に近いところ程、筒い密度で光反射性処理２ａを施こし
各領域の平均的な密度に差を伺けることによって、光拡
散透過板３より前方への出射光が各領域内では均一発光
であり、かつ各領域における強度に差を伺けてもよい。In the above embodiment, a case was shown in which uniform light emission was obtained over the entire surface, but as an advanced embodiment, the light diffusing and transmitting plate 3 is divided into a plurality of arbitrary regions, and the light diffusing and transmitting plate 3 of the light source 2 is divided into a plurality of arbitrary regions.
The closer the light reflection treatment 2a is to the tube density, the difference in the average density of each area can be seen, so that the light emitted forward from the light diffusing and transmitting plate 3 is emitted uniformly within each area. , and there may be a difference in intensity in each region.
また、複数の光源を設けるものの場合、各光源よりの出
射光のそれぞれが均一発光に寄与するように、光反射性
あるいは光吸収性処理を施こしてもよい。Furthermore, in the case where a plurality of light sources are provided, a light reflective or light absorbing treatment may be applied so that each light emitted from each light source contributes to uniform light emission.
光反射性処理２ａは光吸収性処理であってもよいことは
重ねて言う寸でもない。It goes without saying that the light reflective treatment 2a may be a light absorbing treatment.
また、光反射性処理２ａは光を鏡面反射させるものでも
拡散反射させるものであってもよい。また、アルミ蒸着
、ポットスタンプ、印刷などを光源２の表面へ着けたも
のや予め印刷した透明シートや透明チューブか、穴を明
けた金属、プラスチックあるいは紙などのノＰイブで光
源２を包んだものなどであってもよい。さらに、光反射
性処理２ａは水玉模様のような飛び飛びのパターンでな
く、連続的であるが光反射性或いは吸収性処理が徐々に
変化しているようなものであってもよい。これは、例え
ば徐々に厚みを変えた乳白色樹脂であってもよい。光源
２は球状あるいはリング状などであってもよい。光反射
板１けアルミなどの鏡面反射性のものであってもよい。Further, the light reflective treatment 2a may be one that causes light to be specularly reflected or diffusely reflected. Alternatively, the light source 2 may be wrapped with aluminum vapor deposition, pot stamps, printing, etc. applied to the surface of the light source 2, a pre-printed transparent sheet or transparent tube, or a tube made of metal, plastic, or paper with holes drilled in it. It may also be something. Further, the light reflective treatment 2a may not be a discrete pattern such as a polka dot pattern, but may be a continuous pattern in which the light reflective or absorbent treatment gradually changes. This may be, for example, a milky white resin of gradually varying thickness. The light source 2 may be spherical or ring-shaped. A specular reflective material such as a single light reflecting plate made of aluminum may also be used.
光拡散透過板３は部分的におおわれたものでもよい。The light diffusing and transmitting plate 3 may be partially covered.
以」二のように、この発明によれば光源に直接に光反射
性或いは光吸収性処理を分布１．て施こすように構成し
たので、従来、中間位置に固定していた不均一光透過板
が不要となり、高精度位置合せや防振苅策が不要で、比
較的に簡単で安価な構成のものが得られる効果がある。As described in 2 below, according to the present invention, the light source is directly subjected to light reflective or light absorbing treatment.1. Since it is configured to be applied by hand, there is no need for a non-uniform light transmitting plate that was conventionally fixed at an intermediate position, and there is no need for high precision alignment or anti-vibration measures, resulting in a relatively simple and inexpensive configuration. There is an effect that can be obtained.
複数の光源を設けるものの場合、どれかが点灯しなくて
も均一発光が得られたり、個別に点滅させて調光しまた
り、三原色光源を設け、個別に点灯制御して、可変色か
つ均一発光の面光源装置が得られる効果がある。In the case of a device with multiple light sources, uniform light emission can be obtained even if one of the light sources is not turned on, or the light can be dimmed by blinking individually, or three primary color light sources can be installed and the lighting can be controlled individually to achieve variable color and uniform light emission. This has the effect of providing a surface light source device.
ｍ１図はこの発明の一実施例による面光源装置を示す断
面図、第２図は従来の面光源装置を示す断面図である。
■・・・光反射体、２・・・光源、３・−・光拡散透過
板、２ａ・・・光反射性処理或いは光吸収性処理。
尚、図中同一符号は同一部分又は相当部分を示す。FIG. m1 is a sectional view showing a surface light source device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional surface light source device. ■...Light reflector, 2...Light source, 3...Light diffusing and transmitting plate, 2a...Light reflective treatment or light absorbing treatment. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (3)
および該光源の前方に配置された光拡散透過板を備え、
該光拡散透過板の前方へ光を放つ面光源装置において、
前記光源の光の出射面に光反射性処理或いは光吸収性処
理を分布させて施こしたことを特徴とする面光源装置。(1) A light reflector, a light source placed in front of the light reflector,
and a light diffusing and transmitting plate disposed in front of the light source,
In a surface light source device that emits light in front of the light diffusing and transmitting plate,
A surface light source device characterized in that a light emitting surface of the light source is subjected to a light reflective treatment or a light absorbing treatment in a distributed manner.
散透過板に近いところだけ高い密度で施されていること
を特徴とする特許請求の範囲第１項に記載の面光源装置
。(2) The surface light source device according to claim 1, wherein the light reflective treatment or the light absorption treatment is applied at a high density only in areas close to the light diffusing and transmitting plate.
散透過板の複数の領域ごとに光拡散透過板に近いところ
程高い密度で施し且つ前記領域ごとに平均密度を異にし
ていることを特徴とする特許請求の範囲第１項に記載の
面光源装置。(3) The light-reflective treatment or the light-absorptive treatment is applied to each of a plurality of regions of the light-diffusing and transmitting plate at a higher density closer to the light-diffusing and transmitting plate, and the average density is different for each region. A surface light source device according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25595484A JPS61133502A (en) | 1984-12-03 | 1984-12-03 | Surface light source unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25595484A JPS61133502A (en) | 1984-12-03 | 1984-12-03 | Surface light source unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61133502A true JPS61133502A (en) | 1986-06-20 |
| JPS6410881B2 JPS6410881B2 (en) | 1989-02-22 |
Family
ID=17285884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25595484A Granted JPS61133502A (en) | 1984-12-03 | 1984-12-03 | Surface light source unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61133502A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0160303U (en) * | 1987-10-07 | 1989-04-17 | ||
| JPH01103112U (en) * | 1987-12-28 | 1989-07-12 | ||
| JPH01103108U (en) * | 1987-12-28 | 1989-07-12 | ||
| JPH0221119A (en) * | 1988-07-06 | 1990-01-24 | Yoshio Adachi | Carbage incineration method |
| US5134549A (en) * | 1990-06-19 | 1992-07-28 | Enplas Corporation | Surface light source device |
| WO2004038283A1 (en) * | 2002-10-22 | 2004-05-06 | Sharp Kabushiki Kaisha | Backlight unit and liquid crystal display unit using backlight unit |
| JP2007188886A (en) * | 2006-01-11 | 2007-07-26 | Samsung Electro-Mechanics Co Ltd | Backlight unit with improved light mixing property |
| JP2009032525A (en) * | 2007-07-26 | 2009-02-12 | Opt Design:Kk | Surface illumination unit, surface illumination light source device, and surface lighting system |
| JP2009110696A (en) * | 2007-10-26 | 2009-05-21 | Opt Design:Kk | Surface lighting unit, surface lighting source device and surface lighting system |
| JP2009176437A (en) * | 2008-01-21 | 2009-08-06 | Toppan Printing Co Ltd | Light source unit, backlight unit, and display |
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| JPS5750114U (en) * | 1980-09-09 | 1982-03-20 | ||
| JPS57115083U (en) * | 1981-01-06 | 1982-07-16 | ||
| JPS598809A (en) * | 1982-07-06 | 1984-01-18 | 京阪コンクリ−ト工業株式会社 | Split mold frame in automatic concrete molding apparatus |
| JPS6134188U (en) * | 1984-07-31 | 1986-03-01 | 株式会社 乃村工芸社 | Fluorescent light for illuminated signs |
-
1984
- 1984-12-03 JP JP25595484A patent/JPS61133502A/en active Granted
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48101133A (en) * | 1972-04-04 | 1973-12-20 | ||
| JPS4967483U (en) * | 1972-09-21 | 1974-06-12 | ||
| JPS55133008A (en) * | 1979-04-03 | 1980-10-16 | Ono Gijutsu Kenkyusho:Kk | Thin type shaukasten |
| JPS55164879A (en) * | 1979-06-09 | 1980-12-22 | Kiyouritsu Iriyou Denki Kk | Display device with builttin fluolescent lamp |
| JPS5750114U (en) * | 1980-09-09 | 1982-03-20 | ||
| JPS57115083U (en) * | 1981-01-06 | 1982-07-16 | ||
| JPS598809A (en) * | 1982-07-06 | 1984-01-18 | 京阪コンクリ−ト工業株式会社 | Split mold frame in automatic concrete molding apparatus |
| JPS6134188U (en) * | 1984-07-31 | 1986-03-01 | 株式会社 乃村工芸社 | Fluorescent light for illuminated signs |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0160303U (en) * | 1987-10-07 | 1989-04-17 | ||
| JPH0530254Y2 (en) * | 1987-10-07 | 1993-08-03 | ||
| JPH01103112U (en) * | 1987-12-28 | 1989-07-12 | ||
| JPH01103108U (en) * | 1987-12-28 | 1989-07-12 | ||
| JPH0530253Y2 (en) * | 1987-12-28 | 1993-08-03 | ||
| JPH0221119A (en) * | 1988-07-06 | 1990-01-24 | Yoshio Adachi | Carbage incineration method |
| JPH0718541B2 (en) * | 1988-07-06 | 1995-03-06 | 義夫 足立 | Garbage incinerator |
| US5134549A (en) * | 1990-06-19 | 1992-07-28 | Enplas Corporation | Surface light source device |
| WO2004038283A1 (en) * | 2002-10-22 | 2004-05-06 | Sharp Kabushiki Kaisha | Backlight unit and liquid crystal display unit using backlight unit |
| US7455425B2 (en) | 2002-10-22 | 2008-11-25 | Sharp Kabushiki Kaisha | Backlight unit and liquid crystal display device using the backlight unit |
| US7901103B2 (en) | 2002-10-22 | 2011-03-08 | Sharp Kabushiki Kaisha | Backlight unit and liquid crystal display device using the backlight unit |
| JP2007188886A (en) * | 2006-01-11 | 2007-07-26 | Samsung Electro-Mechanics Co Ltd | Backlight unit with improved light mixing property |
| JP4499750B2 (en) * | 2006-01-11 | 2010-07-07 | サムソン エレクトロ−メカニックス カンパニーリミテッド． | Backlight unit with improved light mixing performance |
| US7834952B2 (en) | 2006-01-11 | 2010-11-16 | Samsung Led Co., Ltd. | Backlight unit improved in light mixing feature |
| JP2009032525A (en) * | 2007-07-26 | 2009-02-12 | Opt Design:Kk | Surface illumination unit, surface illumination light source device, and surface lighting system |
| JP4538674B2 (en) * | 2007-07-26 | 2010-09-08 | 株式会社オプトデザイン | Surface illumination unit, surface illumination light source device, surface illumination device, and development substrate for manufacturing surface illumination unit |
| JP2009110696A (en) * | 2007-10-26 | 2009-05-21 | Opt Design:Kk | Surface lighting unit, surface lighting source device and surface lighting system |
| JP4538675B2 (en) * | 2007-10-26 | 2010-09-08 | 株式会社オプトデザイン | Surface illumination unit, surface illumination light source device, and surface illumination device |
| JP2009176437A (en) * | 2008-01-21 | 2009-08-06 | Toppan Printing Co Ltd | Light source unit, backlight unit, and display |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6410881B2 (en) | 1989-02-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |