JPH0797444B2 - Flat light source - Google Patents
Flat light sourceInfo
- Publication number
- JPH0797444B2 JPH0797444B2 JP58083694A JP8369483A JPH0797444B2 JP H0797444 B2 JPH0797444 B2 JP H0797444B2 JP 58083694 A JP58083694 A JP 58083694A JP 8369483 A JP8369483 A JP 8369483A JP H0797444 B2 JPH0797444 B2 JP H0797444B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- fluorescent tube
- light guide
- flat
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/007—Incandescent lamp or gas discharge lamp
- G02B6/0071—Incandescent lamp or gas discharge lamp with elongated shape, e.g. tube
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/025—Associated optical elements
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/89—Optical components associated with the vessel
- H01J2229/8926—Active components, e.g. LCD's, indicators, illuminators and moving devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Description
【発明の詳細な説明】 本発明は、薄型の平面光源に関する。The present invention relates to a thin flat light source.
さらに詳しくは、蛍光放電管と前記蛍光放電管の放射束
を集束する手段とを備えた光源部と、導光体部と、光拡
散板とからなる平面光源に関する。More specifically, the present invention relates to a flat light source including a light source section including a fluorescent discharge tube and a means for focusing a radiant flux of the fluorescent discharge tube, a light guide section, and a light diffusion plate.
白熱電灯等、各種蛍光放電管を光源とした平面光源は、
第１図に示すように、反射板，拡散板を用いた系で
構成され、均質輝度を得るためには、拡散板を光源か
ら距離を置く必要があり、このために占有する空間が大
きく、省スペースを要求される表示装置の光源や広告看
板等には不満足な光源であつた。Flat light sources that use various fluorescent discharge tubes as light sources, such as incandescent lamps,
As shown in FIG. 1, it is composed of a system using a reflection plate and a diffusion plate, and in order to obtain a uniform brightness, it is necessary to place the diffusion plate at a distance from the light source. It was an unsatisfactory light source for the light source of display devices and advertising billboards, etc., which required space saving.
また、省スペース平面光源としては、EL（エレクトロル
ミネセンス），発光ダイオード，平型螢光管等が実用に
供されているが、発光色が限定される、均質な平面輝度
が得られない、発光効率が低いなどの問題を持つてい
る。Further, as a space-saving flat light source, EL (electroluminescence), light emitting diode, flat-type fluorescent tube and the like have been put to practical use, but the emission color is limited, and uniform flat brightness cannot be obtained. It has problems such as low luminous efficiency.
本発明の平面光源は、このような従来の平面光源の欠点
を解消し、表示輝度の均一化、低消費電力化、小型化等
を図るものである。The flat light source of the present invention solves the above-mentioned drawbacks of the conventional flat light source, and achieves uniform display brightness, low power consumption, and miniaturization.
以下、実施例を参照しながら本発明を詳説する。Hereinafter, the present invention will be described in detail with reference to examples.
実施例１ 第２図は、螢光管として、アパーチヤー型螢光管を使用
した場合の見取図である。アパーチヤー型螢光管は、
第３図（ａ）の断面図に示すようにガラス壁に反射膜
，螢光体層を塗布し、アパーチヤー部には何も塗
布しない構造、もしくは類似の構造を有している。した
がつてアパーチヤー部は通常の螢光管の数倍の光束発
散度を得ている。言い換えると、螢光管の光束を集め、
アバーチヤー部から放射していることに他ならない。こ
のように集光された光束は、くさび状の導光系に導び
かれる。導光系の入射端面はアパーチヤー部に近接し
て設置され、光束を無駄なく導ける構造になつている。
この例では、そのために透明樹脂で密着させている。
また導光系は光吸収が少ない屈折率が空気より大きい屈
折率を持つ透明材料ならば使用できるが、ここでは透明
性と加工性から透明無色のアクリル樹脂を使用した。Example 1 FIG. 2 is a sketch drawing when an aperture type fluorescent tube is used as the fluorescent tube. Aperture type fluorescent tube
As shown in the sectional view of FIG. 3 (a), it has a structure in which a reflection film and a fluorescent layer are applied to the glass wall and nothing is applied to the aperture part, or a similar structure. Therefore, the aperture part has a luminous flux divergence several times that of an ordinary fluorescent tube. In other words, collect the luminous flux of the fluorescent tube,
It is nothing but the radiation from the Avertier. The light flux thus condensed is guided to the wedge-shaped light guide system. The incident end face of the light guide system is installed close to the aperture part, and has a structure that can guide the light flux without waste.
In this example, transparent resin is used for this purpose.
The light guide system can be used as long as it is a transparent material having a low light absorption and a refractive index higher than that of air. Here, a transparent colorless acrylic resin is used because of its transparency and processability.
アクリル樹脂（導光系）は、第２図，第３図のように、
くさび形に成形され、さらに反射面を第３図（ｂ）に
示す鋸状断面や、同じく（ｃ）に示す散乱面に加工され
る。これは入射光束が導光系の平面部から多く放射
されるようにするためである。なおは光を均質化する
ための拡散板である。Acrylic resin (light guide system) is used as shown in Figs.
It is formed into a wedge shape, and the reflection surface is processed into a saw-like cross section shown in FIG. 3 (b) or a scattering surface shown in FIG. 3 (c). This is because the incident light flux is radiated more from the flat portion of the light guide system. It is a diffuser for homogenizing the light.
アクリル樹脂（導光系）の反射面は第４図（ａ）に示
すように、光束の一面を全反射、もしくは導光体外に出
射し、再入射することにより屈折し、入射角が輪界角よ
り大きくなつたところで全反射する。このように光束の
大部分は反射面と反射側の平面部から出射する。ま
た必要に応じ、第４図（ｂ）に示すように反射膜を付
設することによつて、反射面側からのもれ光を利用する
ことができる。また、導光系は、平面部以外からの光束
のもれを防ぐために、反射面以外の平面は平坦に仕上げ
ることが肝要である。As shown in Fig. 4 (a), the reflecting surface of the acrylic resin (light guide system) is totally reflected on one surface of the light flux, or is emitted outside the light guide body and is refracted by re-incident, so that the incident angle is the ring Total reflection occurs at a point larger than the corner. As described above, most of the light flux is emitted from the reflecting surface and the flat portion on the reflecting side. If necessary, by providing a reflective film as shown in FIG. 4 (b), it is possible to utilize the light leaked from the reflective surface side. Further, in the light guide system, it is important that the planes other than the reflecting surface be finished flat in order to prevent leakage of the light flux from other than the plane portion.
4Wの小型アパーチヤー型螢光管、アクリル導光系を用い
た有効面積40cm2の平面部において平面部の輝度が200
0cd/m2以上を得た。これは従来の反射状＋拡散板に匹敵
する値である。The brightness of the flat surface is 200 in the flat area with an effective area of 40 cm 2 using a 4 W small aperture type fluorescent tube and an acrylic light guide system.
I got more than 0 cd / m 2 . This is a value comparable to the conventional reflective + diffuser plate.
実施例２ 実施例２は、螢光管として反射型螢光管を使用し、実施
例１と同じ導光系により平面光源を得たものである。そ
こで簡単に、実施例２で用いた反射型螢光管の説明を加
える。Example 2 In Example 2, a reflection type fluorescent tube was used as the fluorescent tube, and a flat light source was obtained by the same light guiding system as in Example 1. Therefore, a brief description of the reflection type fluorescent tube used in Example 2 will be added.
第５図は実施例２の断面図である。反射型螢光管は、
ガラス壁に一部を除いて反射膜が塗布、焼成され、
次に螢光体層が全管内に塗付、焼成されている。反射
型螢光管について詳しくは特許公報昭49−45510,昭50−
8861を参照されたい。FIG. 5 is a sectional view of the second embodiment. The reflection type fluorescent tube
The reflective film is applied and baked on the glass wall except for a part,
The phosphor layer is then applied to all tubes and fired. For details on the reflection type fluorescent tube, refer to Japanese Patent Publications Sho 49-45510 and Sho 50-
See 8861.
この反射型螢光管を用いた系では、可視光ではなく、紫
外線を有効に発光部に集める点が、実施例１と異なつ
ている。この実施例２の場合も、実施例１と同程度の平
面部の輝度を得ている。The system using this reflection type fluorescent tube is different from Example 1 in that not the visible light but the ultraviolet rays are effectively collected in the light emitting portion. Also in the case of the second embodiment, the brightness of the flat portion is similar to that of the first embodiment.
実施例３ 実施例３は、螢光管として特殊な発光部を持たない一般
型を用いた場合である。Example 3 Example 3 is a case where a general type having no special light emitting portion is used as a fluorescent tube.
第６図の断面図に示すように、螢光管は反射板によ
つて周囲を取り囲まれ、導光系に近接する一部の反射板
が開口している。螢光管から出た光束は、反射板に
より開口部に集光される。しかしこの時、反射板か
らの反射光の一部は再び螢光管に戻り吸収される。この
ため実施例１のアパーチヤー形螢光管や、実施例２の反
射型螢光管に比べ効率の低下が見られる。しかるに開口
部の光束発散度は明らかに大きくなる。こうして導光
系に集められた光束は、実施例１と同じく発散し、平面
光源となる。As shown in the sectional view of FIG. 6, the fluorescent tube is surrounded by a reflecting plate, and a part of the reflecting plate close to the light guide system is opened. The luminous flux emitted from the fluorescent tube is focused on the opening by the reflecting plate. However, at this time, a part of the reflected light from the reflecting plate returns to the fluorescent tube and is absorbed. Therefore, the efficiency is lower than that of the aperture type fluorescent tube of Example 1 and the reflection type fluorescent tube of Example 2. However, the luminous flux divergence of the aperture is obviously increased. The light flux collected in this way in the light guide system diverges in the same way as in Example 1, and becomes a flat light source.
実施例４ 実施例１〜３は、直管タイプの螢光管であつたが、本発
明は螢光管の形状については自由に対応できる。その一
例として、実施例４はＵ字型の螢光管の場合である。一
般に、螢光管はある程度管長が長くないと効率が低下す
る。したがつて、Ｕ字型管は効率の点からも、直管に比
べ有利である。Example 4 Examples 1 to 3 were straight tube type fluorescent tubes, but the present invention can freely cope with the shape of the fluorescent tube. As an example, the fourth embodiment is a case of a U-shaped fluorescent tube. Generally, the efficiency of a fluorescent tube decreases unless the tube length is long to some extent. Therefore, the U-shaped pipe is also more advantageous than the straight pipe in terms of efficiency.
実施例１〜３で挙げたいずれの集光方式を採用しても、
Ｕ字管にも適用されるが、ここではアパーチヤー型Ｕ字
螢光管の例を挙げる。第７図はその見取図、第８図は断
面図である。Even if any of the condensing methods mentioned in Examples 1 to 3 is adopted,
Although it is applied to a U-shaped tube, an example of an aperture type U-shaped fluorescent tube will be given here. FIG. 7 is a sketch drawing and FIG. 8 is a sectional view.
アパーチヤー型螢光管は開口部を有し、開口部に
合わせて導光系の入射端面が近接して配置されてい
る。導光系は透明なアクリル樹脂から成り、中央部が
薄いくさびが向かいあつた形状をしている。反射面等の
処置は、実施例１と同様に行なつている。The aperture type fluorescent tube has an opening, and the incident end face of the light guide system is arranged close to the opening. The light guide system is made of transparent acrylic resin, and has a thin wedge facing the center. The treatment of the reflecting surface and the like is performed in the same manner as in the first embodiment.
以上、実施例を挙げて本発明を説明した。以上説明した
通り、本発明は、蛍光放電管と前記蛍光放電管の放射束
を集束する手段とを備えた光源部と、導光体部と、光拡
散板とからなる平面光源において、前記導光体部は、前
記光源部から離れるにしたがって厚みが薄くなるくさび
形状を有し、その一方の平面は光反射面、他方の平面は
光出射面であり、 前記光源部は、前記導光体部の側方に配置され、 前記光拡散板は、前記導光体部の光出射面側に前記光反
射面と平行に配置されてなることにより、 （ａ）光源部が放射束の集束手段を有することにより高
発光効率化及び低消費電力化、 （ｂ）くさび型導光体部を使用し、かつ光源部を導光体
の側方に配置したことによる薄型化、 （ｃ）出射面側に光拡散板を設けたことによる、出射光
の輝度分布の均一化、 （ｄ）光拡散板を反射面と平行に配置したことによる、
輝度分布の均一化及び光束の方向（配光）の均一化、 （ｅ）平面光源の省スペース化、低消費電力化 を実現できるという効果を有するものである。The present invention has been described with reference to the examples. As described above, the present invention provides a planar light source including a light source unit including a fluorescent discharge tube and a means for focusing a radiant flux of the fluorescent discharge tube, a light guide section, and a light diffusing plate. The light body portion has a wedge shape that becomes thinner as the distance from the light source portion increases, one plane of which is a light reflecting surface and the other plane is a light emitting surface, and the light source portion is the light guide body. Is disposed on the side of the light guide plate, and the light diffuser plate is arranged on the light exit face side of the light guide member in parallel with the light reflection face, so that (a) the light source unit converges the radiant flux. Having high luminous efficiency and low power consumption, (b) thinning by using a wedge-shaped light guide section and arranging the light source section on the side of the light guide section, (c) emission surface Uniformity of the brightness distribution of the emitted light by providing a light diffuser on the side, (d) Reflecting the light diffuser Due to the fact that the parallel with,
This has the effect that the brightness distribution can be made uniform, the direction of the light flux (light distribution) can be made uniform, and (e) the space of the flat light source can be saved and the power consumption can be reduced.
従って、本発明の平面光源は、小型情報機器や小型表示
機器等、ポータブルな表示機器の分野での使用に特に有
効である。Therefore, the flat light source of the present invention is particularly effective for use in the field of portable display devices such as small information devices and small display devices.
第１図は、反射板，拡散板を用いた従来の例を示す切欠
き見取図である。 第２図は、本発明によるアパーチヤー型螢光管を用いた
場合の見取図である。 第３図は第２図の場合の断面図である。（ａ）は全体の
断面、（ｂ），（ｃ）は反射面の断面を示すものであ
る。 第４図（ａ），（ｂ）は、光束の全反射、屈折後全反射
の様子を示すものである。 第５図は反射型螢光管を用いた場合の断面図である。 第６図は通常の螢光管と反射板を用いた場合の断面図で
ある。 第７図はアパーチヤー型Ｕ字螢光管を用いた場合の見取
図である。 第８図は第６図の断面図である。FIG. 1 is a cutaway sketch showing a conventional example using a reflection plate and a diffusion plate. FIG. 2 is a sketch of the case where the aperture type fluorescent tube according to the present invention is used. FIG. 3 is a sectional view in the case of FIG. (A) shows the entire cross section, and (b) and (c) show the cross section of the reflecting surface. FIGS. 4 (a) and 4 (b) show the state of total reflection of a light beam and total reflection after refraction. FIG. 5 is a cross-sectional view when a reflection type fluorescent tube is used. FIG. 6 is a cross-sectional view in the case where a normal fluorescent tube and a reflector are used. FIG. 7 is a sketch drawing when an aperture type U-shaped fluorescent tube is used. FIG. 8 is a sectional view of FIG.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭51−35582（ＪＰ，Ａ) 実公 昭40−1646（ＪＰ，Ｙ１) 実願昭54−8432号（実開昭55−109206 号）の願書に添付した明細書及び図面の内 容を撮影したマイクロフィルム（ＪＰ, Ｕ) 実願昭46−5098号（実開昭47−4958号) の願書に添付した明細書及び図面の内容を 撮影したマイクロフィルム（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-51-35582 (JP, A) JP-A-40-1646 (JP, Y1) JP-A-54-8432 (JP-A-55-109206) The contents of the specification and drawings attached to the application for Microfilm (JP, U) Jpn. Appl. No. 46-5098 (Jpn. Photographed microfilm (JP, U)
Claims (1)
束する手段とを備えた光源部と、導光体部と、光拡散板
とからなる平面光源において、 前記導光体部は、前記光源部から離れるにしたがって厚
みが薄くなるくさび形状を有し、その一方の平面は光反
射面、他方の平面は光出射面であり、 前記光源部は、前記導光体部の側方に配置され、 前記光拡散板は、前記導光体部の光出射面側に前記光反
射面と平行に配置されてなることを特徴とする平面光
源。1. A flat light source comprising a light source section comprising a fluorescent discharge tube and a means for focusing a radiation flux of the fluorescent discharge tube, a light guide section, and a light diffusion plate, wherein the light guide section is , Has a wedge shape that becomes thinner as the distance from the light source section increases, one plane of which is a light reflecting surface and the other plane is a light emitting surface, and the light source section is lateral to the light guide section. The flat light source is characterized in that the light diffusion plate is arranged in parallel with the light reflection surface on the light emission surface side of the light guide section.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58083694A JPH0797444B2 (en) | 1983-05-13 | 1983-05-13 | Flat light source |
| US07/036,204 US4870484A (en) | 1983-05-13 | 1987-04-08 | Color display device using light shutter and color filters |
| US08/717,472 USRE36792E (en) | 1983-05-13 | 1996-09-20 | Color display device using light shutter and color filters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58083694A JPH0797444B2 (en) | 1983-05-13 | 1983-05-13 | Flat light source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59210411A JPS59210411A (en) | 1984-11-29 |
| JPH0797444B2 true JPH0797444B2 (en) | 1995-10-18 |
Family
ID=13809596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58083694A Expired - Lifetime JPH0797444B2 (en) | 1983-05-13 | 1983-05-13 | Flat light source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0797444B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH052883Y2 (en) * | 1985-08-01 | 1993-01-25 | ||
| JP2652009B2 (en) * | 1986-04-07 | 1997-09-10 | 大日本印刷株式会社 | Surface light source |
| US5050946A (en) * | 1990-09-27 | 1991-09-24 | Compaq Computer Corporation | Faceted light pipe |
| JPH0470602U (en) * | 1990-10-30 | 1992-06-23 | ||
| JPH0545602U (en) * | 1991-11-20 | 1993-06-18 | アルプス電気株式会社 | Illumination device |
| CA2121610C (en) * | 1993-04-27 | 1999-09-21 | Fumikazu Nagano | Image scanning device |
| JP4487629B2 (en) * | 2004-05-14 | 2010-06-23 | 凸版印刷株式会社 | Surface illumination device and liquid crystal display device using the same |
| JP4810329B2 (en) * | 2006-06-29 | 2011-11-09 | キヤノン株式会社 | Display device and electronic device |
| DE102019126084A1 (en) * | 2019-09-27 | 2021-04-01 | Sick Ag | Photoelectric sensor and optical element |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS401646Y1 (en) * | 1964-03-24 | 1965-01-19 | ||
| JPS474958U (en) * | 1971-02-03 | 1972-09-13 | ||
| JPS5135582A (en) * | 1974-09-21 | 1976-03-26 | Murayama Takaharu | MENHATSUKOTAI |
| JPS55109206U (en) * | 1979-01-26 | 1980-07-31 | ||
| JPS59143202A (en) * | 1983-02-03 | 1984-08-16 | セイコーエプソン株式会社 | Plane light source |
-
1983
- 1983-05-13 JP JP58083694A patent/JPH0797444B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59210411A (en) | 1984-11-29 |
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