JPS63170841A - Lighting device for original reading device - Google Patents
Lighting device for original reading deviceInfo
- Publication number
- JPS63170841A JPS63170841A JP62002929A JP292987A JPS63170841A JP S63170841 A JPS63170841 A JP S63170841A JP 62002929 A JP62002929 A JP 62002929A JP 292987 A JP292987 A JP 292987A JP S63170841 A JPS63170841 A JP S63170841A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- discharge tube
- electromagnetic field
- frequency electromagnetic
- frequency
- 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
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 19
- 238000005286 illumination Methods 0.000 claims description 13
- 239000000758 substrate Substances 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 108091008695 photoreceptors Proteins 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Landscapes
- Facsimile Scanning Arrangements (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は原稿読取装置の照明装置に関し、特に放電管に
外部より高周波電磁界を印加して可視光を発光させる照
明装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an illumination device for a document reading device, and more particularly to an illumination device that applies a high-frequency electromagnetic field to a discharge tube from the outside to emit visible light.
（従来の技術）
従来より原稿読取装置の照明装置にあっては光源として
蛍光灯が広く使用されている。この蛍光灯は放電管（蛍
光管）の内部両端にフィラメントを配設し、該フィラメ
ントから放出される熱電子により封入ガスを励起させて
発光している。この場合フィラメントに流れる電流を増
やし熱電子放出量を増大させれば発光光量は増加するが
、電流の増大はフィラメント自体の蒸発を早める等して
その寿命を著しく低下させるので実際には大光量が得に
＜＜、特に高速機に要求される大光量の露光用光源には
不向きであった。(Prior Art) Fluorescent lamps have been widely used as light sources in illumination devices for document reading devices. This fluorescent lamp has a filament disposed at both ends inside a discharge tube (fluorescent tube), and emits light by exciting a sealed gas with thermoelectrons emitted from the filament. In this case, increasing the current flowing through the filament and increasing the amount of thermionic emission will increase the amount of emitted light, but increasing the current will accelerate the evaporation of the filament itself and significantly reduce its lifespan, so in reality, the amount of light emitted will increase. In particular, it was unsuitable for use as an exposure light source with a large amount of light required for high-speed machines.
そこで、放電管に外部よりマイクロ波を照射して封入ガ
スを励起させ可視光を発光させる光源が提案されている
。この光源はフィラメントを有さないので大電力供給が
可能であり大光量が得られるものの、以下に示す新たな
問題が生じていた。Therefore, a light source has been proposed in which a discharge tube is irradiated with microwaves from the outside to excite the filled gas and emit visible light. Since this light source does not have a filament, it is possible to supply a large amount of power and obtain a large amount of light, but a new problem has arisen as described below.
即ち、マグネトロン等のマイクロ波供給源から放電管へ
のマイクｑ原伝送に用いられる導波管の断面寸法に対し
て放電管は長尺に（３０Ｃ−程度）形成されているので
、この放電管の全長に亘り均一なマイクロ波照射を行う
には、導波管先端（マイクロ波放射部）と放電管とを適
度に離隔させ且つマイクロ波を広げて放射させなければ
ならず、この際の電力損失が極めて大きくなっていた。That is, since the discharge tube is formed to be long (about 30C) compared to the cross-sectional dimension of the waveguide used for transmitting the microphone Q original from the microwave supply source such as a magnetron to the discharge tube, this discharge tube In order to uniformly irradiate microwaves over the entire length of the waveguide, the tip of the waveguide (microwave radiating part) and the discharge tube must be separated appropriately and the microwaves must be spread and radiated. Losses were becoming extremely large.
そこで、上記マイクロ波印加方式に替えて放電管に高周
波電磁界（１０〜２０ＭＨｚ程度）を印加して封入ガス
を励起させて可視光を得る光源が提案されている。第４
図に示すようにこの光源を用いた照明装置１００は一側
面にスリット部１０１を有したケース１０２内に放電管
１０３と高周波印加手段である回路基盤１０４とを内包
している。そして、放電管１０３と回路基盤１０４との
間には放電管１０３の発光光をスリット部１０１方向へ
反射する反射笠１０５を備えている。また、放電管１０
３外周には電極１０６を近接配置してあり、この電極１
０８には回路基板１０４からコネクター１０７，１０８
及びケーブル１０９を介して高周波電力を供給している
１、この際の放電管１０３への電極供給は電極１０６へ
大電力を供給して行われるので大光量が得られ、さらに
放電管１０３と電極１０６とが近接しているので高周波
電力の供給に際しての電力損失は小さいものであった。Therefore, instead of the microwave application method described above, a light source has been proposed in which a high frequency electromagnetic field (about 10 to 20 MHz) is applied to the discharge tube to excite the filled gas and obtain visible light. Fourth
As shown in the figure, a lighting device 100 using this light source includes a discharge tube 103 and a circuit board 104, which is a high frequency application means, in a case 102 having a slit portion 101 on one side. A reflective shade 105 is provided between the discharge tube 103 and the circuit board 104 to reflect the light emitted from the discharge tube 103 toward the slit section 101. In addition, the discharge tube 10
An electrode 106 is arranged close to the outer periphery of the electrode 1.
08 has connectors 107 and 108 from the circuit board 104.
High-frequency power is supplied via the cable 109 and the electrode 103 is supplied to the discharge tube 103 by supplying high power to the electrode 106, so a large amount of light can be obtained, and the discharge tube 103 and the electrode 106, the power loss during the supply of high frequency power was small.
（発明が解決しようとする問題点）
しかしながら、斯かる従来例にあっては、高周波電力の
伝送をコネクター及びケーブルを介して行っているので
、コネクターやケーブルにおいて電力損失が生じてしま
い、またケーブルによるアンテナ効果によって高周波電
磁界ノイズを発生してしまう問題点が生じていた。(Problems to be Solved by the Invention) However, in such conventional examples, high frequency power is transmitted via connectors and cables, so power loss occurs in the connectors and cables, and the cable A problem has arisen in that high-frequency electromagnetic field noise is generated due to the antenna effect caused by the antenna.
そこで本発明は従来技術の上記した問題点を解決するた
めになされたもので、その目的とするところは、大光量
が得られることはもちろん、電力損失及び高周波電磁界
ノイズの発生量が少ない原稿読取装置の照明装置を提供
することにある。Therefore, the present invention has been made to solve the above-mentioned problems of the prior art.The purpose of the present invention is to provide a document that not only provides a large amount of light but also reduces power loss and generates less high-frequency electromagnetic field noise. An object of the present invention is to provide an illumination device for a reading device.
（問題点を解決するための手段）
上記の目的を達成するために、本発明に係る原稿読取装
置の照明装置にあっては、高周波電磁界が印加されるこ
とにより可視光を発する放電管と、該放電管外壁に接し
てもしくは近傍に配設された電極と、該電極に高周波電
力を印加する高周波印加手段とを有する原稿読取装置の
照明装置において、前記高周波印加手段の出力端に前記
電極の入力端を直接接続したことによって構成される。(Means for Solving the Problems) In order to achieve the above object, the lighting device of the document reading device according to the present invention includes a discharge tube that emits visible light when a high frequency electromagnetic field is applied. , an illumination device for a document reading device comprising an electrode disposed in contact with or near the outer wall of the discharge tube, and a high frequency application means for applying high frequency power to the electrode, the electrode being provided at an output end of the high frequency application means. It is constructed by directly connecting the input terminals of the
（作 用）
上記の構成を有する本発明においては、高周波印加手段
の出力端に電極の入力端を直接接続することによって、
両者間に電力伝送用の他の部材を介在させる必要をなく
したので、高周波電力伝送に際しての電力損失及び高周
波電磁界ノイズの発生量は低下する。(Function) In the present invention having the above configuration, by directly connecting the input end of the electrode to the output end of the high frequency application means,
Since there is no need to interpose another member for power transmission between the two, power loss and the amount of high frequency electromagnetic field noise generated during high frequency power transmission are reduced.
（実施例）
以下に本発明を図示、の実施例に基づいて説明する。第
１図及び第２図は本発明に係る原稿読取装置の照明装置
の一実施例を示すもので、図中１は照明装置本体を示す
、さらに、同図において２はアルゴン等の始動用希ガス
と水銀ガス等の励起紫外光発光材が封入された放電管で
あり、該放電管２の内壁には蛍光体が塗布されている。(Example) The present invention will be described below based on the illustrated example. 1 and 2 show an embodiment of the illumination device for a document reading device according to the present invention, in which 1 indicates the illumination device main body, and 2 indicates a starting gas such as argon. It is a discharge tube in which a gas and an excited ultraviolet light emitting material such as mercury gas are sealed, and the inner wall of the discharge tube 2 is coated with phosphor.
３は表面を、例えば絶縁テープ処理または絶縁コート処
理等で絶縁被覆された導体を複数回コイル状に巻いた電
極であり、該電極３は放電管２の外壁に長手方向に沿っ
て複数側配設されている。この電極３には、その近傍に
高周波印加手段である回路基板４を配設し、且つ電極３
の入力端３ａを回路基板４の出力端４ａにはんだ付は等
によって直付けしている。そして、この電極３には高周
波印加手段によって高周波電流（、ｌＯＭＨｚ〜２０Ｍ
Ｈｚ程度）が流されるが、この高周波電流により発生し
放電管２へ印加される高周波電磁界により放電管２の封
入ガスが放電し、この放電により励起された水銀原子よ
り紫外線が発光され、この紫外線が放電管２内壁に塗布
された蛍光体に作用し可視光の発光が起こる。Reference numeral 3 denotes an electrode having a conductor whose surface is coated with insulation, for example, with an insulation tape treatment or an insulation coating treatment, and wound into a coil shape multiple times. It is set up. A circuit board 4, which is a high frequency applying means, is disposed near the electrode 3, and
The input end 3a of the circuit board 4 is directly attached to the output end 4a of the circuit board 4 by soldering or the like. A high frequency current (10MHz to 20MHz) is applied to this electrode 3 by a high frequency applying means.
The high-frequency electromagnetic field generated by this high-frequency current and applied to the discharge tube 2 discharges the gas filled in the discharge tube 2, and the mercury atoms excited by this discharge emit ultraviolet rays. The ultraviolet rays act on the phosphor coated on the inner wall of the discharge tube 2, causing visible light to be emitted.
６は例えばアルミニウム、銅、鉄等の導電性の良い金属
で略Ｕ字状断面に形成された反射笠で、該反射笠６はそ
の内側表面に銀等の金属材をめっき又は蒸着して反射面
を形成し、放電管２の発する可視光を所定方向に反射す
る働きを持つ、さらに、反射笠６は高周波電磁界をシー
ルドするｉ＠きを持つ。Reference numeral 6 denotes a reflective shade made of a highly conductive metal such as aluminum, copper, or iron and formed into a substantially U-shaped cross section. The reflective shade 6 forms a surface and has the function of reflecting visible light emitted by the discharge tube 2 in a predetermined direction.Furthermore, the reflective shade 6 has an i@ function to shield high frequency electromagnetic fields.
また、５はアルミニウム、鉄等の導電性の良い金属で形
成されたケースであり、該ケース５は上記放電管２、電
極３、回路基板４及び反射笠６が内部に固定すると共に
、電極３及び回路基板４等が発する高周波電磁界ノイズ
をシールドしてケース５ａ外部へ漏らさない働きを持つ
、そして、このケース５の放電管２前方の一側面には放
電管ｚ長手方向に沿って延びて金属製メツシュよりなる
スリット部５ａが形成されており、該スリット部５ａよ
り放電管２の発する可視光を放射している。尚、スリッ
ト部５ａのメツシュは前記電極３の発する高周波電磁界
ノイズをシールドして外部へ極力漏らさない働きを持つ
。Further, 5 is a case made of a highly conductive metal such as aluminum or iron, and the case 5 has the discharge tube 2, the electrode 3, the circuit board 4, and the reflective shade 6 fixed therein, and the electrode 3. It has the function of shielding high-frequency electromagnetic field noise generated by the circuit board 4, etc., and prevents it from leaking to the outside of the case 5a, and on one side of the case 5 in front of the discharge tube 2, there is a groove extending along the longitudinal direction of the discharge tube z. A slit portion 5a made of a metal mesh is formed, and visible light emitted by the discharge tube 2 is emitted from the slit portion 5a. The mesh of the slit portion 5a has the function of shielding the high frequency electromagnetic field noise generated by the electrode 3 and preventing it from leaking to the outside as much as possible.
尚、７は高周波印加手段へ電力を供給する入力電源部で
ある。Note that 7 is an input power supply unit that supplies power to the high frequency application means.
上記構成を有する本実施例において、入力電源部７によ
ってケース５内の高周波印加手段に電力を供給すると、
高周波印加手段は、高周波発振、増幅そしてインピーダ
ンス整合を行ない高周波電流を電極３に流す、すると、
電極３は高周波電磁界を放射し、この高周波電磁界のう
ち放電管２と交差する成分が、放電管２の封入ガスの放
電、励起に寄与して、放電管２から可視光を発し、この
可視光をケース５のスリット部５ａから放射する。In this embodiment having the above configuration, when power is supplied to the high frequency application means in the case 5 by the input power supply section 7,
The high-frequency applying means performs high-frequency oscillation, amplification, and impedance matching to cause a high-frequency current to flow through the electrode 3. Then,
The electrode 3 emits a high-frequency electromagnetic field, and the component of this high-frequency electromagnetic field that intersects with the discharge tube 2 contributes to the discharge and excitation of the gas filled in the discharge tube 2, causing the discharge tube 2 to emit visible light. Visible light is emitted from the slit portion 5a of the case 5.
さらに、本実施例においては、第２図に示すように電極
３を放電管２の外壁に当接して配置したので、放射され
る高周波電磁界のうち放電管２と交差する成分の割合を
高くすることができ、その結果消費電力当たりの発光効
率は高くなっている。但し、電極３は必ずしも放電管２
外壁に当接しなくてもよく、外壁近傍でもよい、また、
電極３の一端を高周波印加手段の回路基板４に直付けし
ているため、電極３と回路基板４との間にコネクターや
ケーブルなどの別部材を介在させる必要がなく、依って
インピーダンスの不整合等による電力損失及びこの電力
損失に伴う高周波電磁界ノイズの発生を少なくすること
ができる。Furthermore, in this embodiment, since the electrode 3 is placed in contact with the outer wall of the discharge tube 2 as shown in FIG. As a result, the luminous efficiency per power consumption is high. However, the electrode 3 is not necessarily the discharge tube 2.
It does not have to be in contact with the outer wall, it can be near the outer wall, and
Since one end of the electrode 3 is directly attached to the circuit board 4 of the high frequency application means, there is no need to interpose another member such as a connector or cable between the electrode 3 and the circuit board 4, thereby eliminating impedance mismatch. It is possible to reduce the power loss due to the above and the generation of high frequency electromagnetic field noise accompanying this power loss.
尚、以上の実施例にあっては放電管の長手方向に複数台
の電極を配設した場合について説明したが、これに限定
されず、放電管の両端に一対の電極を配設した場合や放
電管の長手方向に沿って導体をコイル状に巻きつけた場
合等にも適用することができる。但し、放電管長手方向
の発光ムラをなくし、さらに点灯制御を容易且つ早く行
うためには、複数の電極を有することが望ましい。In the above embodiments, the case where a plurality of electrodes are arranged in the longitudinal direction of the discharge tube has been described, but the invention is not limited to this, and the case where a pair of electrodes is arranged at both ends of the discharge tube or It can also be applied to cases where the conductor is wound in a coil along the longitudinal direction of the discharge tube. However, in order to eliminate uneven light emission in the longitudinal direction of the discharge tube and to perform lighting control easily and quickly, it is desirable to have a plurality of electrodes.
また、上記実施例にあっては入力電源部７をケース５の
外に設けたが、これに限定されず、入力電源部７をケー
ス５内に設けてもよく、この場合には照明装置の一層の
小型化が可能となる。Further, in the above embodiment, the input power supply section 7 is provided outside the case 5, but the invention is not limited to this, and the input power supply section 7 may be provided inside the case 5, in which case the lighting device Further miniaturization becomes possible.
次に、第１図に示した照明装置を画像形成装置の原稿読
取装置に適用した場合について、第４図に基づいて説明
する。同図においてｌは照明装置、２１は原稿蔵置カバ
ー、２２は原稿台ガラス、２３は第１ミラー、２４は第
２ミラー、２５はインミラーレンズ、２６は第３ミラー
、２７は感光体ドラム、２８は１次及び２次帯電器、２
９は現像器、３０は転写材、３１は転写帯電器、３２は
搬送ベルト、３３は定着器、３４は排紙スタッカー、３
５はクリーナ、３６は除電器、３７は除電ランプである
。Next, a case where the illumination device shown in FIG. 1 is applied to a document reading device of an image forming apparatus will be described based on FIG. 4. In the figure, l is a lighting device, 21 is a document storage cover, 22 is a document table glass, 23 is a first mirror, 24 is a second mirror, 25 is an in-mirror lens, 26 is a third mirror, 27 is a photosensitive drum, 28 is a primary and secondary charger, 2
9 is a developing device, 30 is a transfer material, 31 is a transfer charger, 32 is a conveyor belt, 33 is a fixing device, 34 is a paper discharge stacker, 3
5 is a cleaner, 36 is a static eliminator, and 37 is a static eliminator lamp.
上記構成によると、先ず照明装置１は画像を下向きにし
て原稿台ガラス２２と原稿載置カバー２１との間に置か
れた原稿を照明する。この原稿からの反射光は照明装置
１と一緒に矢印Ａ方向に移動する第１ミラー２３と、同
じく矢印入方向に移動する第２ミラーとによって反射し
、さらにインミラーレンズ２５、第３ミラー２６を介し
て矢印Ｂ方向に回転する感光体ドラム２７上に至る。According to the above configuration, first, the illumination device 1 illuminates the document placed between the document table glass 22 and the document placement cover 21 with the image facing downward. The reflected light from the original is reflected by a first mirror 23 that moves in the direction of arrow A together with the illumination device 1, a second mirror that also moves in the direction of arrow A, and is further reflected by an in-mirror lens 25 and a third mirror 26. The photoreceptor drum 27 rotates in the direction of arrow B.
ところで感光体ドラム２７上は予め１次及び２次帯電器
２８によって一様帯電が施されているため、前記反射光
の照射された部分の帯電電位が低下して感光体ドラム２
７表面に静電潜像が形成される。この静電潜像は現像器
２９によって供給されるトナーによって顕像化され、次
いでこの顕像化されたトナー像は転写材３０上に転写帯
電器３１の作用によって転写される。その後、未定着の
トナー像を有する転写材３０は搬送ベルト３２によって
定着器３３へ搬送され、該定着器３３の作用によりトナ
ー像を定着した後排紙スタッカー３４上に排紙される。By the way, since the surface of the photoreceptor drum 27 is uniformly charged in advance by the primary and secondary chargers 28, the charging potential of the portion irradiated with the reflected light decreases, and the photoreceptor drum 2
7. An electrostatic latent image is formed on the surface. This electrostatic latent image is visualized by toner supplied by a developing device 29, and then this developed toner image is transferred onto a transfer material 30 by the action of a transfer charger 31. Thereafter, the transfer material 30 having the unfixed toner image is conveyed by the conveyor belt 32 to a fixing device 33, and after the toner image is fixed by the action of the fixing device 33, the sheet is discharged onto a paper discharge stacker 34.
一方、転写材３０上に転写されずに感光体ドラム２７上
に残ったトナーはクリーナ３５によって除去され１次い
で感光体ドラム２７表面は除電器３６で除電され、さら
に除電ランプ３７で照射された後、次の画像形成プロセ
スを行う。On the other hand, toner remaining on the photoreceptor drum 27 without being transferred onto the transfer material 30 is removed by a cleaner 35, and then the surface of the photoreceptor drum 27 is neutralized by a static eliminator 36, and is further irradiated with a static eliminator lamp 37. , perform the following image forming process.
上記画像形成装置には本発明に係る原稿読取装置の照明
装置を適用したので、大光量が得られ、その分露光時間
が短縮でき１画像形成の高速化が可能となる。また照明
装置における電力損失及び高周波電磁界ノイズの発生を
少なくしたので、消費電力の低減が図られ、且つノイズ
による制御系の誤動作の防止ができる。Since the illumination device of the document reading device according to the present invention is applied to the image forming apparatus, a large amount of light can be obtained, and the exposure time can be shortened accordingly, making it possible to speed up the formation of one image. Furthermore, since power loss and generation of high-frequency electromagnetic field noise in the lighting device are reduced, power consumption can be reduced, and malfunctions of the control system due to noise can be prevented.
（発明の効果）
本発明は以上の構成及び作用からなるもので、放電管外
部の電極から高周波電力を供給することによって大光量
が得られるばかりか、高周波印加手段の出力端に電極の
入力端を直接接続することによって電力損失及び高周波
電磁界ノイズの発生量を低減できるという効果が得られ
る。(Effects of the Invention) The present invention has the above-described configuration and operation, and not only can a large amount of light be obtained by supplying high-frequency power from the electrode outside the discharge tube, but also the output end of the high-frequency applying means can be connected to the input end of the electrode. By directly connecting the two, it is possible to reduce power loss and the amount of high-frequency electromagnetic field noise generated.
第１図は本発明に係る原稿読取装置の照明装置を示す概
略斜視図、第２図は同実施例の要部を拡大した斜視図、
第３図は第１図に示す実施例を画像形成装置に適用した
場合を示す説明図、第４図は従来の原稿読取装置を示す
概略斜視図である。
符号の説明
２・・・放電管 ３・・・電極３ａ・・・入
力端
４・・・回路基板（高周波印加手段）
４ａ・・・出力端
特許出願人 キャノン株式会社、７−＼第１図FIG. 1 is a schematic perspective view showing an illumination device of a document reading device according to the present invention, and FIG. 2 is an enlarged perspective view of main parts of the same embodiment.
FIG. 3 is an explanatory diagram showing a case where the embodiment shown in FIG. 1 is applied to an image forming apparatus, and FIG. 4 is a schematic perspective view showing a conventional document reading device. Explanation of symbols 2...Discharge tube 3...Electrode 3a...Input end 4...Circuit board (high frequency application means) 4a...Output end Patent applicant Canon Co., Ltd., 7-\Figure 1
Claims (1)
電管と、該放電管外壁に接してもしくは近傍に配設され
た電極と、該電極に高周波電力を印加する高周波印加手
段とを有する原稿読取装置の照明装置において、前記高
周波印加手段の出力端に前記電極の入力端を直接接続し
たことを特徴とする原稿読取装置の照明装置。A document reading device having a discharge tube that emits visible light when a high-frequency electromagnetic field is applied, an electrode disposed in contact with or near the outer wall of the discharge tube, and a high-frequency application means that applies high-frequency power to the electrode. 1. An illumination device for a document reading device, characterized in that an input end of the electrode is directly connected to an output end of the high frequency application means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62002929A JPS63170841A (en) | 1987-01-09 | 1987-01-09 | Lighting device for original reading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62002929A JPS63170841A (en) | 1987-01-09 | 1987-01-09 | Lighting device for original reading device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63170841A true JPS63170841A (en) | 1988-07-14 |
Family
ID=11543033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62002929A Pending JPS63170841A (en) | 1987-01-09 | 1987-01-09 | Lighting device for original reading device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63170841A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61185857A (en) * | 1985-02-13 | 1986-08-19 | Matsushita Electric Works Ltd | Electrodeless discharge lamp |
-
1987
- 1987-01-09 JP JP62002929A patent/JPS63170841A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61185857A (en) * | 1985-02-13 | 1986-08-19 | Matsushita Electric Works Ltd | Electrodeless discharge lamp |
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