JP2896181B2 - Electrophotographic image forming equipment - Google Patents
Electrophotographic image forming equipmentInfo
- Publication number
- JP2896181B2 JP2896181B2 JP1615790A JP1615790A JP2896181B2 JP 2896181 B2 JP2896181 B2 JP 2896181B2 JP 1615790 A JP1615790 A JP 1615790A JP 1615790 A JP1615790 A JP 1615790A JP 2896181 B2 JP2896181 B2 JP 2896181B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- conductive
- charging
- image forming
- electrophotographic image
- 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 - Fee Related
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、複写機、フアクシミリ、プリンタ電子写真
プロセスを用いた画像形成装置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus using a copying machine, a facsimile, and a printer electrophotographic process.
〔従来技術〕 電子写真画像形成装置の感光体表面を帯電させる方法
として、コロナ放電による方法が現在広く用いられてい
る。この方法は感光体表面を均一に帯電することができ
るが、空気中で放電させるので、オゾンが発生し、これ
が画像品質、感光体に悪影響を及ぼす。又装置外に出た
オゾンが装置のオペレタに不快感を与えるという不具合
いを生じる。更に空気中に放電を起こさせるためにはか
なりの高電圧を必要とするという問題がある。[Prior Art] As a method of charging the surface of a photoreceptor of an electrophotographic image forming apparatus, a method using corona discharge is widely used at present. This method can uniformly charge the surface of the photoreceptor, but discharges it in the air, so that ozone is generated, which adversely affects image quality and the photoreceptor. Further, there is a disadvantage that the ozone which has come out of the apparatus gives an unpleasant feeling to an operator of the apparatus. Further, there is a problem that a considerably high voltage is required to cause a discharge in the air.
斯かるコロナ放電の問題点をなくすため、導電性材料
を用いたブラシやローラを感光体に接触させて帯電させ
る接触帯電方法が例えば特開昭63-149668号公報により
知られている。従来の接触帯電方法では導電性部材を感
光体に均一に接触させる事がむずかしく、この方法を単
に用いただけでは均一な帯電が得られないという問題が
あった。In order to eliminate such a problem of corona discharge, a contact charging method in which a brush or a roller made of a conductive material is brought into contact with a photoreceptor to perform charging is known, for example, from JP-A-63-149668. In the conventional contact charging method, it is difficult to bring the conductive member into uniform contact with the photoreceptor, and there is a problem that uniform charging cannot be obtained by simply using this method.
本発明は、上記の従来の問題点を解消し、低電圧でオ
ゾンの発生が少なく、しかも均一な帯電が得られる電子
写真画像形成装置を提供することを課題としている。SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrophotographic image forming apparatus which solves the above-mentioned conventional problems, generates less ozone at a low voltage, and provides uniform charging.
本発明は、上記の課題を、感光体表面に電圧を印加し
た導電性部材を当接させて帯電を行ない、画像露光によ
り静電潜像を形成する電子写真画像形成装置において、
互に感色性の異なる光導電層よりなる第1層及び第2層
と、導電層よりなる第3層を有する3層構造の感光体の
第1層の表面に前記導電性部材を当接させて帯電を行な
い、帯電と同時もしくは帯電後に前記第1層を導電化す
るが第2層を導電化しない光を感光体表面に照射するこ
とを特徴とする電子写真画像形成装置により解決した。The present invention is directed to an electrophotographic image forming apparatus that forms the electrostatic latent image by image exposure by performing charging by contacting a conductive member to which a voltage has been applied to the surface of a photoreceptor.
The conductive member is brought into contact with the surface of the first layer of a photoconductor having a three-layer structure including a first layer and a second layer made of photoconductive layers having different color sensitivities and a third layer made of a conductive layer. The problem was solved by an electrophotographic image forming apparatus characterized by irradiating the surface of the photoreceptor with light after the first layer was made conductive at the same time as or after the charging, and the second layer was not made conductive.
本発明により、互いに感色性の異なる光導電層よりな
る第1層及び第2層と、導電層よりなる第3層とを有す
る3層構造の感光体の第1層の表面に導電性部材、例え
ば、ローラ、又はブラシ等を当接し、導電性部材に電圧
を印加して接触移動させる。導電性部材による接触によ
り感光体表面は帯電される。帯電と同時もしくは帯電後
に第1層を導電化するが第2層を導電化しない光を感光
体表面に照射する。光の照射により第1層が導電化され
るので第1層表面の帯電が不均一であっても第1層の表
面の電荷は第1層内を自由に動くことができ、結果とし
て第2層の表面は均一に帯電される。画像露光現像等の
その後の通常の画像形成プロセスにより感光体は画像形
成される。According to the present invention, a conductive member is provided on the surface of a first layer of a photoconductor having a three-layer structure including a first layer and a second layer made of photoconductive layers having different color sensitivities and a third layer made of a conductive layer. For example, a roller, a brush, or the like is contacted, and a voltage is applied to the conductive member to move the conductive member. The surface of the photoconductor is charged by contact with the conductive member. At the same time as or after the charging, light is applied to the surface of the photoreceptor to make the first layer conductive but not the second layer conductive. Since the first layer is made conductive by light irradiation, even if the charge on the surface of the first layer is not uniform, the charge on the surface of the first layer can move freely in the first layer, and as a result, the second layer The surface of the layer is uniformly charged. An image is formed on the photoconductor by a subsequent normal image forming process such as image exposure and development.
本発明の詳細を図に示す実施例に基づいて説明する。 The details of the present invention will be described based on an embodiment shown in the drawings.
第1図において感光体1は第1層1aと第2層1bと第3
層1cの3層構造として形成される。第1層1aと第2層1b
は光導電層により形成されるが互いに感色性は異なる層
として形成され、第3層1cは導電層により形成される。In FIG. 1, the photosensitive member 1 has a first layer 1a, a second layer 1b, and a third layer 1b.
It is formed as a three-layer structure of the layer 1c. First layer 1a and second layer 1b
Are formed of photoconductive layers, but are formed as layers having different color sensitivities, and the third layer 1c is formed of a conductive layer.
感光体1の表面、すなわち第1層1aの表面を導電性部
材材としての導電性のローラ2が当接し転動する。導電
性ローラ2はパワーパック4によって電圧が印加され、
感光体1の第3層1cが接地されることにより、感光体1
は電荷の注入を受ける。The surface of the photoreceptor 1, that is, the surface of the first layer 1a, is brought into contact with a conductive roller 2 as a conductive member and rolls. A voltage is applied to the conductive roller 2 by the power pack 4,
When the third layer 1c of the photoconductor 1 is grounded, the photoconductor 1
Undergoes charge injection.
この接触帯電方法では、導電性ローラ2と第1層1aの
接触部だけが帯電される。感光体1と導電性ローラ2の
表面をどれほと滑らかに仕上げても、感光体1の幅方向
の全面にわたって導電性ローラ2を感光体1の表面に接
触させることはむずかしい。導電性ローラ2の表面に傷
がついたり、ごみが付着したりするとなおさら全面接触
は困難である。したがって感光体1の幅方向では第2図
に示すように帯電が不均一になる。In this contact charging method, only the contact portion between the conductive roller 2 and the first layer 1a is charged. No matter how smooth the surfaces of the photoconductor 1 and the conductive roller 2 are, it is difficult to bring the conductive roller 2 into contact with the surface of the photoconductor 1 over the entire surface in the width direction of the photoconductor 1. If the surface of the conductive roller 2 is damaged or dust adheres, it is even more difficult to contact the entire surface. Therefore, the charging becomes non-uniform in the width direction of the photoconductor 1, as shown in FIG.
第1図に示すように導電性ローラ2に隣り合って発光
体3を配置し、導電性ローラ2と共に感光体1との間に
相対移動を行う。発光体3は第1層1aは導電化するが、
第2層1bは導電化しない光を感光体1の幅方向全体にわ
たって照射する。As shown in FIG. 1, a light-emitting body 3 is disposed adjacent to the conductive roller 2, and relatively moves between the conductive roller 2 and the photosensitive member 1. The luminous body 3 makes the first layer 1a conductive,
The second layer 1b irradiates non-conductive light over the entire width of the photoreceptor 1.
発光体3は導電性ローラ2による帯電と同時又は帯電
の後に光を照射する。発光体3の光照射により第1層1a
は導体となるため、第1層1aの表面に帯電された電荷は
自由に第1層1a内を動くことができる。第2層1bは発光
体3の光照射によっても導体とならないので、第1層1a
内の電荷は第2層1bの表面に第3図に示すように均一に
帯電される。この後は画像露光、現像等の通常の電子写
真画像形成プロセスが実施される。The luminous body 3 irradiates light simultaneously with or after charging by the conductive roller 2. The first layer 1 a
Is a conductor, the electric charges charged on the surface of the first layer 1a can freely move in the first layer 1a. Since the second layer 1b does not become a conductor even when the light emitter 3 irradiates light, the first layer 1a
The charges in the inside are uniformly charged on the surface of the second layer 1b as shown in FIG. Thereafter, normal electrophotographic image forming processes such as image exposure and development are performed.
導電性部材は第1図の導電性ローラ2の代わりに第4
図に示すように導電性ブラシ5を用いることができ、又
第5図に示すように導電性ブレード6を用いることがで
きる。第4図及び第5図の例ても導電性部材の近くに上
記の発光体3を配置し、帯電と同時又は帯電後に光照射
するのは第1図と同様である。The conductive member is a fourth member instead of the conductive roller 2 of FIG.
A conductive brush 5 can be used as shown in the figure, and a conductive blade 6 can be used as shown in FIG. Also in the examples of FIGS. 4 and 5, the above-described light emitting body 3 is arranged near the conductive member, and light irradiation is performed at the same time as or after charging as in FIG.
上記の導電性部材を用いる代わりにコロナ放電器を設
けるコロナ放電方法においても上記の感光体1の構成と
発光体3の配置が帯電の均一化においては応用可能であ
る。In the corona discharge method in which a corona discharger is provided instead of using the above-described conductive member, the configuration of the photoconductor 1 and the arrangement of the light emitters 3 can be applied to uniform charging.
本発明により、導電性接触部材により不均一な帯電を
生じても光導電層に対する特定する光の照射により均一
な帯電、つまり表面電位を得ることが可能になり、コロ
ナ放電のような高電圧を必要とせず低電圧の印加で充分
であり、オゾンの発生も少なくすることが可能になっ
た。According to the present invention, even when non-uniform charging is caused by the conductive contact member, uniform charging, that is, surface potential can be obtained by irradiating the photoconductive layer with the specified light, and a high voltage such as corona discharge can be obtained. The application of a low voltage is not required, and the generation of ozone can be reduced.
第1図は本発明に係る電子写真画像形成装置の帯電部の
略説明図、第2図は導電性ローラによる帯電のみの場合
の第1図のA矢印面における感光体の帯電状態の一例を
示す図、第3図は第2図の帯電後における発光体による
光照射後の帯電状態を示す図、第4図及び第5図は変形
例の説明図である。 1……感光体、1a、1b……光導電層 1c……導電層、2……導電ローラ(導電性部材) 3……発光体、4……導電ブラシ(導電性部材) 5……導電ブレード(導電性部材)FIG. 1 is a schematic explanatory view of a charging section of the electrophotographic image forming apparatus according to the present invention, and FIG. 2 shows an example of a charged state of a photoconductor on an arrow A surface of FIG. FIG. 3 is a diagram showing a charged state after light irradiation by the luminous body after charging shown in FIG. 2, and FIGS. 4 and 5 are explanatory diagrams of a modification. DESCRIPTION OF SYMBOLS 1 ... Photoconductor, 1a, 1b ... Photoconductive layer 1c ... Conductive layer, 2 ... Conductive roller (conductive member) 3 ... Light emitting body, 4 ... Conductive brush (conductive member) 5 ... Conductive Blade (conductive member)
Claims (1)
当接させて帯電を行ない、画像露光により静電潜像を形
成する電子写真画像形成装置において、 互に感色性の異なる光導電層よりなる第1層及び第2層
と、導電層よりなる第3層を有する3層構造の感光体の
第1層の表面に前記導電性部材を当接させて帯電を行な
い、帯電と同時もしくは帯電後に前記第1層を導電化す
るが第2層を導電化しない光を感光体表面に照射するこ
とを特徴とする電子写真画像形成装置。1. An electrophotographic image forming apparatus for forming an electrostatic latent image by image exposure by charging a conductive member to which a voltage has been applied on the surface of a photoreceptor to form an electrostatic latent image by image exposure. The conductive member is brought into contact with the surface of the first layer of a three-layer photosensitive member having a first layer and a second layer made of a conductive layer and a third layer made of a conductive layer, and charging is performed. An electrophotographic image forming apparatus, comprising irradiating the surface of the photoreceptor with light that makes the first layer conductive but does not make the second layer conductive at the same time or after charging.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1615790A JP2896181B2 (en) | 1990-01-29 | 1990-01-29 | Electrophotographic image forming equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1615790A JP2896181B2 (en) | 1990-01-29 | 1990-01-29 | Electrophotographic image forming equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03221979A JPH03221979A (en) | 1991-09-30 |
JP2896181B2 true JP2896181B2 (en) | 1999-05-31 |
Family
ID=11908671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1615790A Expired - Fee Related JP2896181B2 (en) | 1990-01-29 | 1990-01-29 | Electrophotographic image forming equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2896181B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101360042B1 (en) | 2011-12-01 | 2014-02-07 | 기아자동차주식회사 | Variable intake system |
-
1990
- 1990-01-29 JP JP1615790A patent/JP2896181B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH03221979A (en) | 1991-09-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |