JP2558443Y2 - Surface lighting device - Google Patents
Surface lighting deviceInfo
- Publication number
- JP2558443Y2 JP2558443Y2 JP1991107041U JP10704191U JP2558443Y2 JP 2558443 Y2 JP2558443 Y2 JP 2558443Y2 JP 1991107041 U JP1991107041 U JP 1991107041U JP 10704191 U JP10704191 U JP 10704191U JP 2558443 Y2 JP2558443 Y2 JP 2558443Y2
- Authority
- JP
- Japan
- Prior art keywords
- guide plate
- light guide
- substrate
- light
- thickness
- 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
Description
【産業上の利用分野】本考案は平面ディスプレイ表示、
とりわけ液晶表示に用いられる面照明装置に関する。[Industrial application] The present invention relates to a flat display,
Particularly, the present invention relates to a surface lighting device used for a liquid crystal display.
【従来の技術】近年、平面ディスプレイ表示に用いられ
る面照明装置が特公平２−４３２８２号公報等に開示さ
れている。しかしこの装置では光源として、螢光灯等が
用いられるため、螢光灯用の反射板を含めて装置の厚さ
が約８ないし１０ｍｍとなり、装置が十分に薄型とはい
えない。そのため薄型化を目的として、本願出願人が、
特願平３−１８４９２５号に於て出願した装置を図５の
断面図にて示す。この図に於て導光板３１は側面に近い
底面にて凹部３２が形成されている。その凹部３２に収
納する様に発光ダイオードランプ３３が配置されてい
る。回路基板３４上の反射板３５の上に接着剤３６を介
して発光ダイオードランプ３３が固定されている。発光
ダイオードランプ３３のフレーム３７は曲げられて回路
基板３４に半田付けされている。そして導光板３１の上
に液晶表示器３８が配置されている。しかして上述の装
置では、液晶表示器３８への照明が不均一になるという
欠点がある。特に液晶表示器３８のＸＹ面に直交するＺ
軸方向に於て不均一である。何故ならばＺ軸方向、すな
わち導光板の側面に沿う方向に対しては、点光源として
の発光ダイオードランプ３３が１個ずつしか設けられて
いないからである。更にこの装置では、発光ダイオード
ランプ３３の略真上の導光板３１の範囲、すなわちＣの
部分が明るすぎて被照明物を配置することができない。
発光ダイオードランプ３３の長さは比較的長いのでＣの
部分も約１０ｍｍと長く、有効発光面積が小さい。さら
に、発光ダイオードランプ３３からの光がフレーム３７
と導光板３１との隙間から洩れるので、導光板３１内へ
の入光量が減るという欠点が生じる。一方、実開平３−
５１３２号公報には、導光板の側面に凹部を形成し、基
板表面に基板の長手方向に沿ってチップＬＥＤを線状に
配列固着し、基板を導光板の側面に配置して導光板の凹
部にチップＬＥＤを配置する点が開示されているが、導
光板の凹部は、上下面が開放した形状となっているの
で、チップＬＥＤの光が凹部の開放した上下面から漏れ
やすく、照明が不均一となるという問題を有している。2. Description of the Related Art In recent years, a surface illuminating device used for displaying a flat display has been disclosed in Japanese Patent Publication No. 2-43282. However, in this device, since a fluorescent lamp or the like is used as a light source, the thickness of the device including the reflector for the fluorescent lamp is about 8 to 10 mm, and the device cannot be said to be sufficiently thin. Therefore, for the purpose of thinning, the applicant of the present application
The apparatus filed in Japanese Patent Application No. 3-184925 is shown in the sectional view of FIG. In this figure, the light guide plate 31 has a concave portion 32 formed on the bottom surface near the side surface. A light emitting diode lamp 33 is arranged so as to be housed in the recess 32. The light emitting diode lamp 33 is fixed on the reflection plate 35 on the circuit board 34 via an adhesive 36. The frame 37 of the light emitting diode lamp 33 is bent and soldered to the circuit board 34. Then, a liquid crystal display 38 is arranged on the light guide plate 31. However, the above-described device has a disadvantage that the illumination of the liquid crystal display 38 becomes non-uniform. In particular, Z perpendicular to the XY plane of the liquid crystal display 38
It is not uniform in the axial direction. This is because only one light emitting diode lamp 33 is provided as a point light source in the Z-axis direction, that is, in the direction along the side surface of the light guide plate. Further, in this device, the area of the light guide plate 31 almost directly above the light emitting diode lamp 33, that is, the portion C is too bright, so that the illuminated object cannot be arranged.
Since the length of the light emitting diode lamp 33 is relatively long, the portion C is as long as about 10 mm, and the effective light emitting area is small. Further, the light from the light emitting diode lamp 33 is
Is leaked from the gap between the light guide plate 31 and the light guide plate 31, so that the amount of light entering the light guide plate 31 is reduced. On the other hand,
No. 5132 discloses a concave portion formed in a side surface of a light guide plate, chip LEDs are linearly arranged and fixed on a surface of the substrate along a longitudinal direction of the substrate, and the substrate is arranged on a side surface of the light guide plate to form a concave portion in the light guide plate. However, since the concave portion of the light guide plate has an open upper and lower surface, the light of the chip LED easily leaks from the open upper and lower surfaces of the light guide plate, and illumination is not performed. There is a problem of uniformity.
【考案が解決しようとする課題】そこで本考案は上述の
欠点を解消し、均一照明でき、しかも有効発光面積を大
きくすることができる面照明装置を提供することを課題
とする。加えて、回路基板との接続が容易で組立作業性
の良い面照明装置を提供することを課題とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned disadvantages and to provide a surface illumination device which can provide uniform illumination and can increase the effective light emitting area. In addition, it is another object of the present invention to provide a surface lighting device that can be easily connected to a circuit board and has good assembling workability.
【課題を解決するための手段】本考案は、光拡散手段を
有する導光板と、該導光板の側面に該導光板の厚みより
も狭い幅で前記側面の長手方向に形成された凹部と、前
記導光板の前記側面に配置した基板と、各辺の大きさが
前記導光板の厚みよりも十分に小さく、前記凹部の中に
位置する様に前記基板の長手方向に沿って線状に整列固
着された発光ダイオードとを備え、前記基板は、回路基
板への固定用の爪と電源端子を兼ねる突起部を備えた事
を特徴とする。According to the present invention, there is provided a light guide plate having light diffusing means, and a concave portion formed on a side surface of the light guide plate with a width smaller than the thickness of the light guide plate in a longitudinal direction of the side surface; The substrate arranged on the side surface of the light guide plate is linearly aligned along the longitudinal direction of the substrate such that the size of each side is sufficiently smaller than the thickness of the light guide plate and located in the recess. A light-emitting diode fixed to the circuit board; and the substrate is provided with a projection serving also as a nail for fixing to a circuit board and a power supply terminal.
【作用】本考案は上述の様に、点光源としての発光ダイ
オードを基板の長手方向に沿って線状に整列固着したの
で、導光板の側面に沿う方向を線状に照明することがで
き、均一照明が得られる。そしてまた、発光ダイオード
を配置するために導光板側面の長手方向に形成された凹
部は、導光板の厚みよりも狭い幅であり、しかも発光ダ
イオードは各辺の大きさが導光板の厚みよりも十分に小
さいので、導光板の明るすぎる端の部分の長さを短くし
て、有効発光面積を大きくすることができるとともに、
照明の均一化を図ることができ、導光板の薄型化、面照
明装置の薄型化に適した構造を提供することができる。
加えて、基板は、回路基板への固定用の爪と電源端子を
兼ねる突起部を備えているので、基板の回路基板への固
定作業性と配線作業性を良好にすることができ、構造の
簡素化と組立て作業性を高めることができる。According to the present invention, as described above, since the light emitting diodes as point light sources are linearly aligned and fixed along the longitudinal direction of the substrate, the direction along the side surface of the light guide plate can be linearly illuminated. Uniform illumination is obtained. Further, the concave portion formed in the longitudinal direction of the light guide plate side surface for arranging the light emitting diode has a width smaller than the thickness of the light guide plate, and the size of each side of the light emitting diode is larger than the thickness of the light guide plate. Since it is sufficiently small, the length of the portion of the light guide plate that is too bright can be shortened, and the effective light emitting area can be increased.
Lighting can be made uniform, and a structure suitable for reducing the thickness of the light guide plate and the thickness of the surface illumination device can be provided.
In addition, the board is provided with a projection that also serves as a power supply terminal and a nail for fixing to the circuit board, so that the workability of fixing the board to the circuit board and the workability of wiring can be improved. Simplification and assembly workability can be improved.
【実施例】以下、本考案実施例を図面に従って説明す
る。図１は本実施例に係る面照明装置の断面図であり、
図２はその装置の分解斜視図である。これらの図に於
て、導光板１は主にアクリル樹脂から成り、厚さ約４ｍ
ｍの平板状である。導光板１の側面２に凹部３が形成さ
れている。凹部３の幅は約２ｍｍ、深さＢは約２ｍｍで
あり、導光板１の厚みよりも狭い幅で側面２の長手方向
に沿って形成されている。具体的には、導光板１は底部
に反射板１ａを、その上に透明板１ｂと１ｃと１ｄが積
層され、その上に拡散板１ｅを設けたものである。そし
て導光板１は内部に光拡散手段を有する。すなわち透明
板１ｂ，１ｃ，１ｄはよく知られている様に、アクリル
板の裏面に白色塗料を斑点状に印刷されたものである。
またはアクリル等の板の裏面にシボ加工を施すことによ
って、裏面にて光を乱反射させて光拡散性を向上したも
のでも良い。拡散板１ｅもアクリル板から成る。そして
望ましくは側面２以外の他の３つの側面２ａ、２ｂ、２
ｃの表面上に接着剤を介して合成紙が貼り付けられてい
る。この合成紙により側面からの光が洩れることを防止
して、光が有効に導光板の上面から取り出される。基板
４は例えばガラスエポキシ樹脂から成る樹脂層５の上に
電源端子６と導電層７ａ、７ｂ、７ｃが印刷配線され、
導電層７ｂの周囲等を除く表面上に白色塗装部８が形成
された長尺のものである。基板４の電源端子６が設けら
れた部分は、後述する回路基板２１との固定用の爪とし
ても機能する突起部を構成する。白色塗装部８は白色レ
ジストなどの塗料が塗布されたものである。基板４は直
径約１．５ｍｍの透孔９を３個有し、厚さは約０．５ｍ
ｍである。基板４の導電層７ｂの上に銀ペースト等の導
電性接着剤１０を介して発光ダイオード１１が固着され
ている。発光ダイオード１１は例えば燐化ガリウムから
成り、約５８０ｎｍの緑色を発光し、大きさは一辺が約
３００μｍの略立方体であり、各辺の大きさが前記導光
板１の厚みよりも十分に小さな形状となっている。発光
ダイオード１１は基板４の長手方向に沿って、前記導光
板１の厚みよりも狭い約２ｍｍのピッチで基板４の表面
上に線状に整列して固着される。ピッチがこれより大き
いと、基板４の線状方向に対して、照明ムラが大きくな
る。またピッチがこれより小さいと、配線などの作業が
しにくいので、約２ｍｍ程度が適切である。そして発光
ダイオード１１と他の導電層との間に金属細線１２が配
線されている。発光ダイオード１１が導光板１の凹部３
に位置する様に、基板４の透孔９に導光板１の側面２に
形成された３個のピン１３が挿入され、基板４の表面と
導光板１の側面２は当接している。反射枠１４は例えば
ガラス入りポリカーポネイト樹脂より成り、厚さは約１
ｍｍであり、断面が逆Ｌ字状に形成されている。この様
に、反射枠１４は白色樹脂から成り反射性の良い材質か
ら選択される。導光板１の３個のピン１３は基板４の透
孔９と反射枠１４の透孔１５を挿入して、先端を溶着す
ることにより、基板４と反射枠１４は導光板１に固定さ
れている。そして反射枠１４は基板４の裏面１６と上面
１７及び導光板１の側面の近傍１８を覆う様に配置され
ている。この様に側面の近傍１８を覆う事により、発光
ダイオード１１からの発光が反射して外部に放射しない
ので、導光板１の端部が明るすぎることを防止できる。
また導光板１の側面の近傍１８と反射枠１４との間に、
例えば厚さ０．１ｍｍのアルミ箔等から成り反射枠１４
より少し長い反射板１９を配置しても良い。この反射板
１９を適正な長さに設けることにより、導光板１の端部
の明るさを調整して照明ムラを完全に解消できる。液晶
表示器２０と回路基板２１はそれぞれ、導光板１の上と
下に配置されている。次に本実施例の面照明装置に用い
られた発光ダイオードを固定した基板を詳細に説明す
る。図３は図１のＡＡ断面図であり、図４は基板の図面
である。これらの図に於て、基板４の樹脂層５の表面上
に銅箔等から成る導電層７ａ、７ｂ、７ｃが形成されて
いる。発光ダイオード１１は導電層７ｃ又は７ｂの上に
固着されている。そして、金属細線１２によって他の導
電層７ｂ又は７ａに配線されている。４個の発光ダイオ
ード１１は直列接続されて、その２組が並列接続されて
いる。ダミー端子２２は導電層７ａ、７ｂ、７ｃと電気
的に接続されていないが、基板４を回路基板２１に固定
する時、爪となり基板４を強度的に維持するために形成
されたものである。すなわち、基板４のダミー端子２２
が設けられた部分は、上記電源端子６と同様に、回路基
板２１との固定用の爪として機能する突起部を構成す
る。基板４の透孔９と電源端子６とダミー端子２２と８
個の窓部２３を除いた表面上に白色塗装部８が形成され
ている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the surface lighting device according to the present embodiment,
FIG. 2 is an exploded perspective view of the device. In these figures, the light guide plate 1 is mainly made of acrylic resin and has a thickness of about 4 m.
m. A concave portion 3 is formed on a side surface 2 of the light guide plate 1. The recess 3 has a width of about 2 mm and a depth B of about 2 mm, and is formed along the longitudinal direction of the side surface 2 with a width smaller than the thickness of the light guide plate 1. Specifically, the light guide plate 1 has a reflector 1a at the bottom, transparent plates 1b, 1c, and 1d laminated thereon, and a diffusion plate 1e provided thereon. The light guide plate 1 has light diffusion means inside. That is, as is well known, the transparent plates 1b, 1c, and 1d are formed by printing a white paint on the back surface of the acrylic plate in spots.
Alternatively, the surface of the plate made of acrylic or the like may be subjected to a graining process so that light is diffusely reflected on the back surface to improve light diffusion. The diffusion plate 1e is also made of an acrylic plate. And desirably, three other side surfaces 2a, 2b, 2 other than the side surface 2
The synthetic paper is stuck on the surface of c through an adhesive. The synthetic paper prevents the light from leaking from the side surface, and the light is effectively extracted from the upper surface of the light guide plate. The power supply terminal 6 and the conductive layers 7a, 7b, 7c are printed and wired on a resin layer 5 made of, for example, glass epoxy resin.
It is a long one in which a white painted portion 8 is formed on the surface except the periphery of the conductive layer 7b. The portion of the substrate 4 on which the power supply terminal 6 is provided constitutes a protrusion that also functions as a claw for fixing the circuit board 21 to be described later. The white painted portion 8 is one coated with a paint such as a white resist. The substrate 4 has three through holes 9 having a diameter of about 1.5 mm and a thickness of about 0.5 m.
m. The light emitting diode 11 is fixed on the conductive layer 7b of the substrate 4 via a conductive adhesive 10 such as a silver paste. The light emitting diode 11 is made of, for example, gallium phosphide, emits green light of about 580 nm, has a substantially cubic shape with a side of about 300 μm, and each side has a size sufficiently smaller than the thickness of the light guide plate 1. It has become. The light emitting diodes 11 are linearly aligned and fixed on the surface of the substrate 4 at a pitch of about 2 mm narrower than the thickness of the light guide plate 1 along the longitudinal direction of the substrate 4. If the pitch is larger than this, illumination unevenness increases in the linear direction of the substrate 4. On the other hand, if the pitch is smaller than this, work such as wiring is difficult, so that about 2 mm is appropriate. A thin metal wire 12 is provided between the light emitting diode 11 and another conductive layer. The light emitting diode 11 is provided in the concave portion 3 of the light guide plate 1.
3, three pins 13 formed on the side surface 2 of the light guide plate 1 are inserted into the through holes 9 of the substrate 4, and the surface of the substrate 4 is in contact with the side surface 2 of the light guide plate 1. The reflection frame 14 is made of, for example, glass-containing polycarbonate resin and has a thickness of about 1 mm.
mm, and the cross section is formed in an inverted L-shape. As described above, the reflection frame 14 is made of a white resin and is selected from a material having good reflectivity. The three pins 13 of the light guide plate 1 are inserted into the through holes 9 of the substrate 4 and the through holes 15 of the reflection frame 14, and the tips are welded, so that the substrate 4 and the reflection frame 14 are fixed to the light guide plate 1. I have. The reflection frame 14 is disposed so as to cover the rear surface 16 and the upper surface 17 of the substrate 4 and the vicinity 18 of the side surface of the light guide plate 1. By covering the vicinity 18 of the side surface in this way, light emitted from the light emitting diode 11 is reflected and does not radiate to the outside, so that the end of the light guide plate 1 can be prevented from being too bright.
Further, between the vicinity 18 of the side surface of the light guide plate 1 and the reflection frame 14,
For example, the reflection frame 14 is made of aluminum foil or the like having a thickness of 0.1 mm.
A slightly longer reflector 19 may be provided. By providing the reflection plate 19 at an appropriate length, the brightness at the end of the light guide plate 1 can be adjusted to completely eliminate illumination unevenness. The liquid crystal display 20 and the circuit board 21 are arranged above and below the light guide plate 1, respectively. Next, a substrate to which the light emitting diode used in the surface lighting device of the present embodiment is fixed will be described in detail. FIG. 3 is a sectional view taken along the line AA of FIG. 1, and FIG. 4 is a drawing of the substrate. In these figures, conductive layers 7a, 7b, 7c made of copper foil or the like are formed on the surface of a resin layer 5 of a substrate 4. The light emitting diode 11 is fixed on the conductive layer 7c or 7b. And, it is wired to another conductive layer 7b or 7a by a thin metal wire 12. The four light emitting diodes 11 are connected in series, and two sets thereof are connected in parallel. Although the dummy terminals 22 are not electrically connected to the conductive layers 7a, 7b, 7c, they serve as claws when the substrate 4 is fixed to the circuit board 21, and are formed to maintain the strength of the substrate 4. . That is, the dummy terminal 22 of the substrate 4
The portion provided with, as in the case of the power supply terminal 6, forms a protrusion that functions as a nail for fixing to the circuit board 21. Through hole 9 of substrate 4, power supply terminal 6, dummy terminals 22 and 8
The white painted portion 8 is formed on the surface excluding the windows 23.
【考案の効果】以上のように本考案によれば、点光源と
しての発光ダイオードを基板の長手方向に沿って線状に
整列固着したので、導光板の側面に沿う方向を線状に照
明することができ、均一照明が得られる。そしてまた、
発光ダイオードを配置するために導光板側面の長手方向
に形成された凹部は、導光板の厚みよりも狭い幅であ
り、しかも発光ダイオードは各辺の大きさが導光板の厚
みよりも十分に小さいので、導光板の明るすぎる端の部
分の長さを短くして、有効発光面積を大きくすることが
できるとともに、照明の均一化を図ることができ、導光
板の薄型化、面照明装置の薄型化に適した構造を提供す
ることができる。加えて、基板は、回路基板への固定用
の爪と電源端子を兼ねる突起部を備えているので、基板
の回路基板への固定作業性と配線作業性を良好にするこ
とができ、構造の簡素化と組立て作業性を高めることが
できる。As described above, according to the present invention, since the light emitting diodes as point light sources are linearly aligned and fixed along the longitudinal direction of the substrate, the direction along the side surface of the light guide plate is linearly illuminated. And uniform illumination can be obtained. and again,
The concave portion formed in the longitudinal direction of the light guide plate side for arranging the light emitting diode has a width narrower than the thickness of the light guide plate, and the size of each side of the light emitting diode is sufficiently smaller than the thickness of the light guide plate Therefore, the length of the excessively bright end portion of the light guide plate can be shortened to increase the effective light emitting area, and to achieve uniform illumination, to reduce the thickness of the light guide plate and the thickness of the surface illumination device. Thus, it is possible to provide a structure suitable for the modification. In addition, the board is provided with a projection that also serves as a power supply terminal and a nail for fixing to the circuit board, so that the workability of fixing the board to the circuit board and the workability of wiring can be improved. Simplification and assembly workability can be improved.
【図１】本考案実施例に係る面照明装置の断面図であ
る。FIG. 1 is a cross-sectional view of a surface lighting device according to an embodiment of the present invention.
【図２】その面照明装置の分解斜視図である。FIG. 2 is an exploded perspective view of the surface illumination device.
【図３】図１のＡＡ断面図である。FIG. 3 is a sectional view taken along the line AA of FIG.
【図４】本考案実施例に係る面照明装置に用いられた発
光ダイオードを固定した基板の正面図である。FIG. 4 is a front view of a substrate to which a light emitting diode used in the surface lighting device according to the embodiment of the present invention is fixed.
【図５】従来の面照明装置の断面図である。FIG. 5 is a sectional view of a conventional surface lighting device.
１ 導光板 ２ 導光板の側面 ３ 凹部 ４ 基板 １１ 発光ダイオード １４ 反射枠 １６ 基板の裏面 １７ 基板の上面 １８ 導光板の側面の近傍 REFERENCE SIGNS LIST 1 light guide plate 2 side surface of light guide plate 3 concave portion 4 substrate 11 light emitting diode 14 reflection frame 16 back surface of substrate 17 upper surface of substrate 18 near side surface of light guide plate
Claims (1)
の側面に該導光板の厚みよりも狭い幅で前記側面の長手
方向に形成された凹部と、前記導光板の前記側面に配置
した基板と、各辺の大きさが前記導光板の厚みよりも十
分に小さく、前記凹部の中に位置する様に前記基板の長
手方向に沿って線状に整列固着された発光ダイオードと
を備え、前記基板は、回路基板への固定用の爪と電源端
子を兼ねる突起部を備えた事を特徴とする面照明装置。1. A light guide plate having light diffusion means, a recess formed in a side surface of the light guide plate with a width smaller than the thickness of the light guide plate in a longitudinal direction of the side surface, and arranged on the side surface of the light guide plate. and a substrate, rather sufficiently smaller than the thickness of the magnitude light guide plate of each side, a front Symbol emitting diode along the longitudinal direction of the substrate so as to position aligned fixed linearly in a recess
The board comprises a claw for fixing to a circuit board and a power supply terminal.
A surface lighting device comprising a projection serving also as a child .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991107041U JP2558443Y2 (en) | 1991-12-25 | 1991-12-25 | Surface lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991107041U JP2558443Y2 (en) | 1991-12-25 | 1991-12-25 | Surface lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0552825U JPH0552825U (en) | 1993-07-13 |
| JP2558443Y2 true JP2558443Y2 (en) | 1997-12-24 |
Family
ID=14449025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991107041U Expired - Lifetime JP2558443Y2 (en) | 1991-12-25 | 1991-12-25 | Surface lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2558443Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3488570B2 (en) * | 1996-03-29 | 2004-01-19 | ローム株式会社 | LED light emitting device and surface emitting lighting device using the same |
| JP5483153B2 (en) * | 2009-03-16 | 2014-05-07 | 株式会社リコー | Light irradiation apparatus, image reading apparatus, and image forming apparatus |
| JP6037247B2 (en) * | 2015-02-17 | 2016-12-07 | 株式会社リコー | Image reading apparatus and image forming apparatus |
| JP6156753B2 (en) * | 2015-02-17 | 2017-07-05 | 株式会社リコー | Image reading apparatus and image forming apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02271304A (en) * | 1989-04-12 | 1990-11-06 | Seiko Epson Corp | Lighting device for display body |
| JP3005132U (en) * | 1994-06-10 | 1994-12-13 | 株式会社イトーキ | Smoking corner post |
-
1991
- 1991-12-25 JP JP1991107041U patent/JP2558443Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0552825U (en) | 1993-07-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |