JPS6472177A - Reversal image forming device - Google Patents
Reversal image forming deviceInfo
- 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
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.
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)
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 |
-
1987
- 1987-09-11 JP JP62228765A patent/JP2547218B2/en not_active Expired - Fee Related
Cited By (3)
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 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |