JPS5660462A - Exposure light quantity adjusting device of slit exposure type variable magnification copying machine - Google Patents
Exposure light quantity adjusting device of slit exposure type variable magnification copying machineInfo
- Publication number
- JPS5660462A JPS5660462A JP13683979A JP13683979A JPS5660462A JP S5660462 A JPS5660462 A JP S5660462A JP 13683979 A JP13683979 A JP 13683979A JP 13683979 A JP13683979 A JP 13683979A JP S5660462 A JPS5660462 A JP S5660462A
- Authority
- JP
- Japan
- Prior art keywords
- photosensitive material
- discharging equipment
- corona discharging
- part potential
- light quantity
- 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
- Exposure Or Original Feeding In Electrophotography (AREA)
- Variable Magnification In Projection-Type Copying Machines (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To make it possible to adjust the exposure light quantity to the photosensitive material stably and accurately, by changing the electric field intensity between the corona discharging equipment and the photosensitive material to an intensity corresponding to the selected circumferential speed of the photosensitive material to control corona discharge given to the photosensitive material. CONSTITUTION:The reference current is flowed to corona discharging equipment 21 for primary charging and corona discharging equipment 22 for electricity removal while photosensitive material 10 is rotated in a circumferential speed corresponding to the selected copying magnification, and the bright part potential and the dark part potential on the surface of the photosensitive material are measured alternately by sensor 29. These signals of the bright part potential and the dark part potential are input to operation control circuit 32 through amplifying circuit 31. The signal set previously of target potential constant signal generating means 33 and the detection signal of sensor 29 are compared with each other, and their difference is calculated, and the calculated correction current according to the correction expression set previously is added to the reference current. This added current is applied to corona discharging equipment 21 for primary charging and corona discharging equipment 22 for electricity removal through power sources 34 and 35.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13683979A JPS5660462A (en) | 1979-10-23 | 1979-10-23 | Exposure light quantity adjusting device of slit exposure type variable magnification copying machine |
US06/141,922 US4411514A (en) | 1979-04-24 | 1980-04-21 | Variable magnification electrophotographic copying apparatus |
DE19803015820 DE3015820A1 (en) | 1979-04-24 | 1980-04-24 | Variable magnification photocopier with constant scanning speed - has variable speed photo-sensitive layer and corrected corona charging rate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13683979A JPS5660462A (en) | 1979-10-23 | 1979-10-23 | Exposure light quantity adjusting device of slit exposure type variable magnification copying machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5660462A true JPS5660462A (en) | 1981-05-25 |
JPH0219954B2 JPH0219954B2 (en) | 1990-05-07 |
Family
ID=15184701
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13683979A Granted JPS5660462A (en) | 1979-04-24 | 1979-10-23 | Exposure light quantity adjusting device of slit exposure type variable magnification copying machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5660462A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58160967A (en) * | 1982-03-19 | 1983-09-24 | Matsushita Electric Ind Co Ltd | Variable power copying machine |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4898842A (en) * | 1972-03-29 | 1973-12-14 | ||
JPS5010124A (en) * | 1973-05-24 | 1975-02-01 |
-
1979
- 1979-10-23 JP JP13683979A patent/JPS5660462A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4898842A (en) * | 1972-03-29 | 1973-12-14 | ||
JPS5010124A (en) * | 1973-05-24 | 1975-02-01 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58160967A (en) * | 1982-03-19 | 1983-09-24 | Matsushita Electric Ind Co Ltd | Variable power copying machine |
Also Published As
Publication number | Publication date |
---|---|
JPH0219954B2 (en) | 1990-05-07 |
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