JPS57178267A - Electrostatic charger for electrophotographic copier - Google Patents

Electrostatic charger for electrophotographic copier

Info

Publication number
JPS57178267A
JPS57178267A JP6242181A JP6242181A JPS57178267A JP S57178267 A JPS57178267 A JP S57178267A JP 6242181 A JP6242181 A JP 6242181A JP 6242181 A JP6242181 A JP 6242181A JP S57178267 A JPS57178267 A JP S57178267A
Authority
JP
Japan
Prior art keywords
electrostatic
photoreceptor
charger
position
parts
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
Application number
JP6242181A
Inventor
Nobuo Momotake
Noriaki Yamazaki
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP6242181A priority Critical patent/JPS57178267A/en
Publication of JPS57178267A publication Critical patent/JPS57178267A/en
Application status is Pending legal-status Critical

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/04Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/045Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas

Abstract

PURPOSE:To adjust the electrostatic contrast of electrostatic latent images by providing an electrostatic brush charger between an image exposure position and a developing position in a photoreceptor freely attachably and detachably to and from the surface of the photoreceptor. CONSTITUTION:An electrostatic charger 2, an exposure slit 3, a developing device 4, a transfer device 5, etc. are disposed around a photoreceptor 1. An electrostatic brush charger 6 is provided between the slit 3 and the device 4. This charger 6 is moved by a solenoid 7 to the position where it attaches to the surface 1a of the photoreceptor and to the position where it detaches therefrom. A voltage VB is kept applied to this charger. Then, the electric charge of - is applied in the parts of the photoreceptor 1 where the voltage is higher than the voltage VB and the electric charge of + in the parts where it is lower, by which the contrast of the potential in the high density parts and low density parts is changed. Hence, the electrostatic constrast of the electrostatic latent images is adjusted.
JP6242181A 1981-04-27 1981-04-27 Electrostatic charger for electrophotographic copier Pending JPS57178267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6242181A JPS57178267A (en) 1981-04-27 1981-04-27 Electrostatic charger for electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6242181A JPS57178267A (en) 1981-04-27 1981-04-27 Electrostatic charger for electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS57178267A true JPS57178267A (en) 1982-11-02

Family

ID=13199667

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6242181A Pending JPS57178267A (en) 1981-04-27 1981-04-27 Electrostatic charger for electrophotographic copier

Country Status (1)

Country Link
JP (1) JPS57178267A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5008706A (en) * 1988-10-31 1991-04-16 Canon Kabushiki Kaisha Electrophotographic apparatus
US5089851A (en) * 1988-02-19 1992-02-18 Canon Kabushiki Kaisha Charging member
US5305177A (en) * 1990-11-02 1994-04-19 Canon Kabushiki Kaisha Charging device and image forming apparatus
US5405725A (en) * 1991-10-08 1995-04-11 Fuji Electric Co., Ltd. Photoconductor for electrophotography
US5459558A (en) * 1990-05-21 1995-10-17 Canon Kabushiki Kaisha Charging device, image forming apparatus with same and a process unit detachably mountable to the image forming apparatus
US5471285A (en) * 1993-04-16 1995-11-28 Bando Chemical Industries, Ltd. Charging member having a surface layer formed of moisture-permeable synthetic resin material and charging device including the same
EP0690352A2 (en) 1994-06-22 1996-01-03 Canon Kabushiki Kaisha Electrophotographic apparatus
US5538826A (en) * 1993-09-09 1996-07-23 Canon Kabushiki Kaisha Electrophotographic image forming method, apparatus and device unit
US5669047A (en) * 1989-03-03 1997-09-16 Canon Kabushiki Kaisha Charging member, electrophotographic apparatus and charging method using the same
US5875375A (en) * 1996-11-12 1999-02-23 Canon Kabushiki Kaisha Electrophotographic apparatus and process cartridge
US5876890A (en) * 1996-05-27 1999-03-02 Canon Kabushiki Kaisha Electrophotographic photosensitive member and apparatus and process cartridge provided with the same
US6118964A (en) * 1997-12-10 2000-09-12 Ricoh Company, Ltd. Multi-functional contact-type charging unit and image transfer unit
US6245473B1 (en) 1993-07-30 2001-06-12 Canon Kabushiki Kaisha Electrophotographic apparatus with DC contact charging and photosensitive layer with polycarbonate resin in charge generation layer
US6324365B1 (en) 1996-05-30 2001-11-27 Canon Kabushiki Kaisha Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus employing the same
US6434351B2 (en) 1996-05-30 2002-08-13 Canon Kabushiki Kaisha Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus employing the same
US6541172B2 (en) 2000-09-29 2003-04-01 Canon Kabushiki Kaisha Electrophotographic photosensitive member, electrophotographic apparatus and process cartridge
US6697591B2 (en) 2001-06-21 2004-02-24 Canon Kabushiki Kaisha Electrophotographic apparatus and process cartridge
US6847797B2 (en) 2002-07-25 2005-01-25 Canon Kabushiki Kaisha Charging apparatus having auxiliary charger rubbing against image bearing member

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5089851A (en) * 1988-02-19 1992-02-18 Canon Kabushiki Kaisha Charging member
US5008706A (en) * 1988-10-31 1991-04-16 Canon Kabushiki Kaisha Electrophotographic apparatus
US5669047A (en) * 1989-03-03 1997-09-16 Canon Kabushiki Kaisha Charging member, electrophotographic apparatus and charging method using the same
US5459558A (en) * 1990-05-21 1995-10-17 Canon Kabushiki Kaisha Charging device, image forming apparatus with same and a process unit detachably mountable to the image forming apparatus
US5305177A (en) * 1990-11-02 1994-04-19 Canon Kabushiki Kaisha Charging device and image forming apparatus
US5405725A (en) * 1991-10-08 1995-04-11 Fuji Electric Co., Ltd. Photoconductor for electrophotography
EP0536692B2 (en) 1991-10-08 2005-06-29 Fuji Electric Co., Ltd. Use of a photoconductor in an electrophotographic apparatus employing contact charging
US5471285A (en) * 1993-04-16 1995-11-28 Bando Chemical Industries, Ltd. Charging member having a surface layer formed of moisture-permeable synthetic resin material and charging device including the same
US6245473B1 (en) 1993-07-30 2001-06-12 Canon Kabushiki Kaisha Electrophotographic apparatus with DC contact charging and photosensitive layer with polycarbonate resin in charge generation layer
US5538826A (en) * 1993-09-09 1996-07-23 Canon Kabushiki Kaisha Electrophotographic image forming method, apparatus and device unit
EP0690352A2 (en) 1994-06-22 1996-01-03 Canon Kabushiki Kaisha Electrophotographic apparatus
US5923925A (en) * 1994-06-22 1999-07-13 Canon Kabushiki Kaisha Electrophotographic apparatus
US5876890A (en) * 1996-05-27 1999-03-02 Canon Kabushiki Kaisha Electrophotographic photosensitive member and apparatus and process cartridge provided with the same
US6324365B1 (en) 1996-05-30 2001-11-27 Canon Kabushiki Kaisha Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus employing the same
US6434351B2 (en) 1996-05-30 2002-08-13 Canon Kabushiki Kaisha Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus employing the same
US5875375A (en) * 1996-11-12 1999-02-23 Canon Kabushiki Kaisha Electrophotographic apparatus and process cartridge
US6118964A (en) * 1997-12-10 2000-09-12 Ricoh Company, Ltd. Multi-functional contact-type charging unit and image transfer unit
US6541172B2 (en) 2000-09-29 2003-04-01 Canon Kabushiki Kaisha Electrophotographic photosensitive member, electrophotographic apparatus and process cartridge
US6697591B2 (en) 2001-06-21 2004-02-24 Canon Kabushiki Kaisha Electrophotographic apparatus and process cartridge
US6847797B2 (en) 2002-07-25 2005-01-25 Canon Kabushiki Kaisha Charging apparatus having auxiliary charger rubbing against image bearing member
US6963709B2 (en) 2002-07-25 2005-11-08 Canon Kabushiki Kaisha Charging apparatus having auxiliary charger rubbing against image bearing member

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