JPS5473055A - Charge quantity controller in electrophotographic copier - Google Patents
Charge quantity controller in electrophotographic copierInfo
- Publication number
- JPS5473055A JPS5473055A JP14021077A JP14021077A JPS5473055A JP S5473055 A JPS5473055 A JP S5473055A JP 14021077 A JP14021077 A JP 14021077A JP 14021077 A JP14021077 A JP 14021077A JP S5473055 A JPS5473055 A JP S5473055A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- photosensitive drum
- charge quantity
- power source
- high voltage
- 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
Abstract
PURPOSE: To surely prevent the degradation in image density with an increase in temperature by controlling the charge quantity according to the temperature change of a temperature-dependent photoreceptor.
CONSTITUTION: A temperature detecting element 3 is disposed on the surface of a phtosensitive drum 1 and is connected to a high voltage power source control circuit 5 via signal exchanger 4. Then, the high voltage power source control circuit 5 controls a high voltage power source 6 according to the detection output of a temperature detecting element 3, by which the applied voltage of the charger 2 charging the surface of the photosensitive drum 1 is controlled and the surface potential of the photosensitive drum 1 is maintained constant, thus the decrease in image density along with a change in the temperature of the photosensitive drum 1 is surely prevented. It is also effective by inserting a grid between the charger 2 and photosensitive drum 1 and changing the charge quantity by the change in grid voltage.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14021077A JPS5473055A (en) | 1977-11-21 | 1977-11-21 | Charge quantity controller in electrophotographic copier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14021077A JPS5473055A (en) | 1977-11-21 | 1977-11-21 | Charge quantity controller in electrophotographic copier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5473055A true JPS5473055A (en) | 1979-06-12 |
Family
ID=15263468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14021077A Pending JPS5473055A (en) | 1977-11-21 | 1977-11-21 | Charge quantity controller in electrophotographic copier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5473055A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5669660A (en) * | 1979-11-09 | 1981-06-11 | Nagano Aichi Denki Kk | Power supply device for copying machine |
JPS5766445A (en) * | 1980-10-11 | 1982-04-22 | Ricoh Co Ltd | Controlling method for extent of charging of electrophotographic copying machine |
US4583835A (en) * | 1982-12-10 | 1986-04-22 | Ricoh Company, Ltd. | Image control device for electrophotographic copier |
US4636060A (en) * | 1984-02-28 | 1987-01-13 | Agfa-Gevaert N.V. | Electrostatic copying method including compensation for photoconductor fatigue and dark recovery |
JPS6296258U (en) * | 1985-12-06 | 1987-06-19 | ||
US5128718A (en) * | 1989-08-31 | 1992-07-07 | Canon Kabushiki Kaisha | Image forming apparatus responsive to ambient condition detecting means |
US7403728B2 (en) * | 2005-07-13 | 2008-07-22 | Xerox Corporation | Calibration apparatus and method for charging unit of image forming device |
-
1977
- 1977-11-21 JP JP14021077A patent/JPS5473055A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5669660A (en) * | 1979-11-09 | 1981-06-11 | Nagano Aichi Denki Kk | Power supply device for copying machine |
JPS5766445A (en) * | 1980-10-11 | 1982-04-22 | Ricoh Co Ltd | Controlling method for extent of charging of electrophotographic copying machine |
US4583835A (en) * | 1982-12-10 | 1986-04-22 | Ricoh Company, Ltd. | Image control device for electrophotographic copier |
US4636060A (en) * | 1984-02-28 | 1987-01-13 | Agfa-Gevaert N.V. | Electrostatic copying method including compensation for photoconductor fatigue and dark recovery |
JPS6296258U (en) * | 1985-12-06 | 1987-06-19 | ||
US5128718A (en) * | 1989-08-31 | 1992-07-07 | Canon Kabushiki Kaisha | Image forming apparatus responsive to ambient condition detecting means |
US7403728B2 (en) * | 2005-07-13 | 2008-07-22 | Xerox Corporation | Calibration apparatus and method for charging unit of image forming device |
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