JPS5529856A - Image former - Google Patents
Image formerInfo
- Publication number
- JPS5529856A JPS5529856A JP10303678A JP10303678A JPS5529856A JP S5529856 A JPS5529856 A JP S5529856A JP 10303678 A JP10303678 A JP 10303678A JP 10303678 A JP10303678 A JP 10303678A JP S5529856 A JPS5529856 A JP S5529856A
- Authority
- JP
- Japan
- Prior art keywords
- drum
- current
- corona
- fluctuations
- output
- 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
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE: To correct the power source fluctuations of a corona discharger and enable current to be maintained constant by so constituting the device that the constant current circuits for detecting the surface potentials on a recording medium and flowing the current corresponding to the detection output thereof to corona dischargers are provided.
CONSTITUTION: An initial value set voltage is inputted from terminal 59 to a multiplexer 56 during the previous rotation of the drum 11 prior to starting of copying operation and the corona current corresponding to the set voltage is flowed from primary and secondary charger high voltage power source circuits 57, 58 to the drum 11. Next, the surface potential of the drum 11 is detected with a surface electrometer 50 and is inputted as the voltage output to a holding circuit 54 in a potential measurement circuit 53. An arithmetic circuit 55 flows the signal corresponding to the correct DC value to the chargers 22, 23 based on the output of the holding circuit 54. By making the current flowing in the high voltage power sources to constant current, the load fluctuations between the chargers 22, 23 and drum 11 owing to environmental fluctuations and degradation of the photoreceptor may be corrected.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10303678A JPS5529856A (en) | 1978-08-24 | 1978-08-24 | Image former |
GB7929344A GB2039101B (en) | 1978-08-24 | 1979-08-23 | Control of electrostatic recording apparatus |
DE19792934337 DE2934337A1 (en) | 1978-08-24 | 1979-08-24 | ELECTROSTATIC RECORDING DEVICE WITH A SURFACE POTENTIOMETER |
GB08228797A GB2108719B (en) | 1978-08-24 | 1982-10-08 | Image formation apparatus |
US07/675,053 US5164771A (en) | 1978-08-24 | 1991-03-25 | Image forming apparatus which adjusts illumination levels independently for test samples and for originals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10303678A JPS5529856A (en) | 1978-08-24 | 1978-08-24 | Image former |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5529856A true JPS5529856A (en) | 1980-03-03 |
JPS6211345B2 JPS6211345B2 (en) | 1987-03-12 |
Family
ID=14343421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10303678A Granted JPS5529856A (en) | 1978-08-24 | 1978-08-24 | Image former |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5529856A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5182596A (en) * | 1990-07-20 | 1993-01-26 | Hitachi Koki Co., Ltd. | Device for measuring surface potentials at photosensitive body and electrostatic recording apparatus using said device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49106336A (en) * | 1973-01-18 | 1974-10-08 | ||
JPS5255537A (en) * | 1975-10-31 | 1977-05-07 | Sumitomo Electric Ind Ltd | Chargning device |
JPS5317339A (en) * | 1976-07-30 | 1978-02-17 | Canon Inc | Method and device for stabilizing surface potential |
JPS5317732A (en) * | 1976-07-31 | 1978-02-18 | Canon Inc | Method and device for charging by corona discharge |
JPS5355031A (en) * | 1976-10-27 | 1978-05-19 | Xerox Corp | Method of and device for controlling electric charge |
-
1978
- 1978-08-24 JP JP10303678A patent/JPS5529856A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49106336A (en) * | 1973-01-18 | 1974-10-08 | ||
JPS5255537A (en) * | 1975-10-31 | 1977-05-07 | Sumitomo Electric Ind Ltd | Chargning device |
JPS5317339A (en) * | 1976-07-30 | 1978-02-17 | Canon Inc | Method and device for stabilizing surface potential |
JPS5317732A (en) * | 1976-07-31 | 1978-02-18 | Canon Inc | Method and device for charging by corona discharge |
JPS5355031A (en) * | 1976-10-27 | 1978-05-19 | Xerox Corp | Method of and device for controlling electric charge |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5182596A (en) * | 1990-07-20 | 1993-01-26 | Hitachi Koki Co., Ltd. | Device for measuring surface potentials at photosensitive body and electrostatic recording apparatus using said device |
Also Published As
Publication number | Publication date |
---|---|
JPS6211345B2 (en) | 1987-03-12 |
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