JPS6472177A - Reversal image forming device - Google Patents

Reversal image forming device

Info

Publication number
JPS6472177A
JPS6472177A JP62228765A JP22876587A JPS6472177A JP S6472177 A JPS6472177 A JP S6472177A JP 62228765 A JP62228765 A JP 62228765A JP 22876587 A JP22876587 A JP 22876587A JP S6472177 A JPS6472177 A JP S6472177A
Authority
JP
Japan
Prior art keywords
electrostatic charging
charging area
area
image forming
developing device
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.)
Granted
Application number
JP62228765A
Other languages
Japanese (ja)
Other versions
JP2547218B2 (en
Inventor
Toshitaka Yui
Shoji Nakamura
Koushi Andou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP62228765A priority Critical patent/JP2547218B2/en
Publication of JPS6472177A publication Critical patent/JPS6472177A/en
Application granted granted Critical
Publication of JP2547218B2 publication Critical patent/JP2547218B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To prevent unnecessary toner and carrier from sticking to a photosensitive body at the beginning and at the end of the image forming by switching the bias of a developing device on or off while an auxiliary electrostatic charging area is passing the moving area of the developing device. CONSTITUTION:A grid voltage is controlled by using a scorotron electrostatic charging device 2 as a main electrocharging charging device, then the auxiliary electrostatic charging area having the lower electric potential than the main electrostatic charging area is formed. And at the beginning and at the end of the image forming action, the auxiliary electrostatic charging area having the lower electric potential than the main electrostatic charging area is formed on the surface of the photosensitive body, then the bias voltage of the developing device 5 is switched on or off while the auxiliary electrostatic charging area is passing the developing operation area of the device 5. The potential difference between the surface of the photosensitive drum 1 and the developer of the developing device 5 is reduced, then the unnecessary developer will not stick on the photosensitive drum 1 by this.
JP62228765A 1987-09-11 1987-09-11 Reverse image forming device Expired - Fee Related JP2547218B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62228765A JP2547218B2 (en) 1987-09-11 1987-09-11 Reverse image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62228765A JP2547218B2 (en) 1987-09-11 1987-09-11 Reverse image forming device

Publications (2)

Publication Number Publication Date
JPS6472177A true JPS6472177A (en) 1989-03-17
JP2547218B2 JP2547218B2 (en) 1996-10-23

Family

ID=16881485

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62228765A Expired - Fee Related JP2547218B2 (en) 1987-09-11 1987-09-11 Reverse image forming device

Country Status (1)

Country Link
JP (1) JP2547218B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02284172A (en) * 1989-04-25 1990-11-21 Mita Ind Co Ltd Image forming device
US5337131A (en) * 1992-11-12 1994-08-09 Indigo N.V. Charging apparatus operative to charge a surface
JP2001350385A (en) * 2000-06-02 2001-12-21 Sharp Corp Image forming device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02284172A (en) * 1989-04-25 1990-11-21 Mita Ind Co Ltd Image forming device
US5337131A (en) * 1992-11-12 1994-08-09 Indigo N.V. Charging apparatus operative to charge a surface
JP2001350385A (en) * 2000-06-02 2001-12-21 Sharp Corp Image forming device

Also Published As

Publication number Publication date
JP2547218B2 (en) 1996-10-23

Similar Documents

Publication Publication Date Title
JPS5614242A (en) Electrostatic developing method
JPS57178267A (en) Electrostatic charger for electrophotographic copier
JPS5511222A (en) Dry type toner cleaning device
JPS57142673A (en) Cleaning method
JPS5545059A (en) Reversal bias developing method
JPS6472177A (en) Reversal image forming device
JPS5764266A (en) Developing device for picture forming device
JPS5484738A (en) Developing device for variable magnification copier
JPS56101169A (en) Electrophotographic developing method
JPS5481855A (en) Two color print type electrostatic recoder
JPS54155840A (en) Developing method in two color electrophotographic copier
JPS6425169A (en) Image forming device
JPS646982A (en) Electrostatic charging device for electrophotographic copying machine
JPS56144442A (en) Developing method
JPS54143238A (en) Developing process
JPS5660452A (en) Electrophotographic device
JPS576873A (en) Developing method for electrostatic latent image
JPS5616155A (en) Transferring-discharging system of electronic copier
JPS5511226A (en) Electrostatic latent image developing method
JPS547332A (en) Electrophotographic method
JPS5377635A (en) Cleaning mechanism
JPS57185072A (en) Picture stabilizing method for picture forming device
JPS56156849A (en) Method and device for regular copying and reversal copying
JPS54134631A (en) Electrophotographic copying process
JPS6449070A (en) Image forming device

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees