JPS55121453A - Electrophotographic copier - Google Patents
Electrophotographic copierInfo
- Publication number
- JPS55121453A JPS55121453A JP2936679A JP2936679A JPS55121453A JP S55121453 A JPS55121453 A JP S55121453A JP 2936679 A JP2936679 A JP 2936679A JP 2936679 A JP2936679 A JP 2936679A JP S55121453 A JPS55121453 A JP S55121453A
- Authority
- JP
- Japan
- Prior art keywords
- photoreceptor drum
- sensitivity photoreceptor
- developing
- sensitivity
- constant
- 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
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE: To make the toner density of images constant by using the temperature rise detection value of high-sensitivity photoreceptor for control input.
CONSTITUTION: A temperature detector 24 is provided near the surface of a high- sensitivity photoreceptor drum 15 and is connected to the control unit 30 which controls the bias voltage of the magnetic brush 27 of a developing device. As a result of this, when the high-sensitivity photoreceptor drum 15 revolves in the arrow u direction and charging, exposure, developing, transfer and cleaning are accomplished subsequently by the device group disposed around the same, the surface temperature change of the high-sensitivity photoreceptor drum 15 is detected and is inputted to a feedback circuit 26. Along with the temperature change, a variable resistor 28 is controlled so that the bias voltage of a magnetic brush 27 is changed, whereby the contrast potentials are maintained always constant irrespective of the change of the surface temperature of the high-sensitivity photoreceptor drum 15, thus the toner pickup amount at the developing is made constant and the toner density of image made constant.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2936679A JPS55121453A (en) | 1979-03-15 | 1979-03-15 | Electrophotographic copier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2936679A JPS55121453A (en) | 1979-03-15 | 1979-03-15 | Electrophotographic copier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55121453A true JPS55121453A (en) | 1980-09-18 |
Family
ID=12274160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2936679A Pending JPS55121453A (en) | 1979-03-15 | 1979-03-15 | Electrophotographic copier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55121453A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59105661A (en) * | 1982-12-10 | 1984-06-19 | Ricoh Co Ltd | Image controlling method in electrophotographic copying machine |
| US4496238A (en) * | 1982-03-31 | 1985-01-29 | Canon Kabushiki Kaisha | Image recording apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53115233A (en) * | 1977-03-18 | 1978-10-07 | Ricoh Co Ltd | Control for electrophotogtaphic copier |
-
1979
- 1979-03-15 JP JP2936679A patent/JPS55121453A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53115233A (en) * | 1977-03-18 | 1978-10-07 | Ricoh Co Ltd | Control for electrophotogtaphic copier |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4496238A (en) * | 1982-03-31 | 1985-01-29 | Canon Kabushiki Kaisha | Image recording apparatus |
| JPS59105661A (en) * | 1982-12-10 | 1984-06-19 | Ricoh Co Ltd | Image controlling method in electrophotographic copying machine |
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