JPS57181568A - Electrophotographic copying machine - Google Patents
Electrophotographic copying machineInfo
- Publication number
- JPS57181568A JPS57181568A JP56067511A JP6751181A JPS57181568A JP S57181568 A JPS57181568 A JP S57181568A JP 56067511 A JP56067511 A JP 56067511A JP 6751181 A JP6751181 A JP 6751181A JP S57181568 A JPS57181568 A JP S57181568A
- Authority
- JP
- Japan
- Prior art keywords
- potential
- developing bias
- electrostatic latent
- developing
- latent image
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/065—Arrangements for controlling the potential of the developing electrode
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing For Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To copying original images of different densities in background parts satisfactorily by changing the correlative relations between reference electrostatic latent image potential and developing bias potential in correspondence to the change in the quantity of exposure light. CONSTITUTION:The potential of the reference electrostatic latent image on a photosensitive drum 1 formed of reference charts 4a, 4b of medium contrast id detected with a surface potential detector 14. In accordance with this, a developing bias control circuit 43 controls an electric power supply 44 for developing bais, and supplies the developing bias of the potential having a constant correlative relation corresponding to the detected reference electrostatic latent image potential to a developing electrode 16. When the image exposure is adjusted, the circuit 43 changes the correlative relation cooperatively with the change in the quantity of exposure light, thereby changing the developing bias voltage. In this way, the image reproducibility in the low density parts is changed, and the original images of different densities in the background parts are copied satisfactorily.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56067511A JPS57181568A (en) | 1981-05-02 | 1981-05-02 | Electrophotographic copying machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56067511A JPS57181568A (en) | 1981-05-02 | 1981-05-02 | Electrophotographic copying machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57181568A true JPS57181568A (en) | 1982-11-09 |
JPH031664B2 JPH031664B2 (en) | 1991-01-11 |
Family
ID=13347073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56067511A Granted JPS57181568A (en) | 1981-05-02 | 1981-05-02 | Electrophotographic copying machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57181568A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59159153A (en) * | 1983-02-28 | 1984-09-08 | Canon Inc | Reproducing and outputting device of image |
JPS60249166A (en) * | 1984-05-24 | 1985-12-09 | Canon Inc | Method for adjusting image density of electrophotograph |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5317339A (en) * | 1976-07-30 | 1978-02-17 | Canon Inc | Method and device for stabilizing surface potential |
JPS5499632A (en) * | 1978-01-24 | 1979-08-06 | Ricoh Co Ltd | Image adjusting method of copying machines |
JPS55127571A (en) * | 1979-03-26 | 1980-10-02 | Fuji Xerox Co Ltd | Control method of electrophotographic copier |
JPS55127572A (en) * | 1979-03-26 | 1980-10-02 | Fuji Xerox Co Ltd | Control unit of electrophotographic copier |
-
1981
- 1981-05-02 JP JP56067511A patent/JPS57181568A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5317339A (en) * | 1976-07-30 | 1978-02-17 | Canon Inc | Method and device for stabilizing surface potential |
JPS5499632A (en) * | 1978-01-24 | 1979-08-06 | Ricoh Co Ltd | Image adjusting method of copying machines |
JPS55127571A (en) * | 1979-03-26 | 1980-10-02 | Fuji Xerox Co Ltd | Control method of electrophotographic copier |
JPS55127572A (en) * | 1979-03-26 | 1980-10-02 | Fuji Xerox Co Ltd | Control unit of electrophotographic copier |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59159153A (en) * | 1983-02-28 | 1984-09-08 | Canon Inc | Reproducing and outputting device of image |
JPS60249166A (en) * | 1984-05-24 | 1985-12-09 | Canon Inc | Method for adjusting image density of electrophotograph |
Also Published As
Publication number | Publication date |
---|---|
JPH031664B2 (en) | 1991-01-11 |
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