JPS57136666A - Electrophotographic device - Google Patents
Electrophotographic deviceInfo
- Publication number
- JPS57136666A JPS57136666A JP56022735A JP2273581A JPS57136666A JP S57136666 A JPS57136666 A JP S57136666A JP 56022735 A JP56022735 A JP 56022735A JP 2273581 A JP2273581 A JP 2273581A JP S57136666 A JPS57136666 A JP S57136666A
- Authority
- JP
- Japan
- Prior art keywords
- surface potential
- circuit
- charger
- comparing
- peak value
- 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
Landscapes
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE: To obtain an image stable to an envirnmental change by arranging a surface potential detector of an oscillation capacity type near a charger, and by directly detecting and feeding back the surface potential of a photoconductive photoreceptor to a control circuit.
CONSTITUTION: When a photoconductive photosensitive drum 28 charged by a charger 39 rotates to confront a surface potential detector 21, the signal of its surface potential and a signal of only a noise level are inputted to the comparing and amplifying circuit 41 of a high-voltage power source 40. Its output is supplied to a capacitor 42 to extract only its AC output component, whose peak value is detected by a peak value detecting circuit 43. The peak value is compared with the reference voltage of a reference voltage power source 44 by a comparing and amplifying circuit 45; when the surface-potential detection signal is lower, the comparing and amplifying circuit 45, a control circuit 46 and a high-voltage generating circuit 47 are operated to raise a high voltage applied to the charger 39.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56022735A JPS57136666A (en) | 1981-02-18 | 1981-02-18 | Electrophotographic device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56022735A JPS57136666A (en) | 1981-02-18 | 1981-02-18 | Electrophotographic device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57136666A true JPS57136666A (en) | 1982-08-23 |
Family
ID=12090982
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56022735A Pending JPS57136666A (en) | 1981-02-18 | 1981-02-18 | Electrophotographic device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57136666A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60117262A (en) * | 1983-11-29 | 1985-06-24 | Mita Ind Co Ltd | Detecting method of surface potential of photosensitive drum |
-
1981
- 1981-02-18 JP JP56022735A patent/JPS57136666A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60117262A (en) * | 1983-11-29 | 1985-06-24 | Mita Ind Co Ltd | Detecting method of surface potential of photosensitive drum |
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