JPS5695249A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPS5695249A JPS5695249A JP17135079A JP17135079A JPS5695249A JP S5695249 A JPS5695249 A JP S5695249A JP 17135079 A JP17135079 A JP 17135079A JP 17135079 A JP17135079 A JP 17135079A JP S5695249 A JPS5695249 A JP S5695249A
- Authority
- JP
- Japan
- Prior art keywords
- cpu2
- developing bias
- charger
- reference current
- predetermined 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
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
Landscapes
- Control Or Security For Electrophotography (AREA)
- Wet Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
PURPOSE:To enable image formation to be carried out even when a converter etc. come to fail in further normal operation owing to a certain reason by providing means of setting conditions of forming electrostatic latent image or developing conditions at predetermined values irrespective of the output of a D/A converting means. CONSTITUTION:After a developing bias control value is integrated, it is applied to the first terminal of a changeover switch SW4. Changeover switches SW2, SW3, SW4 are provided in order to change over potential controlling with a CPU2 and circuits for keeping the developing bias at a predetermined value by flowing reference current to a charger without going through the CPU2. This changing-over makes it possible to flow the reference current to the charger and keep the developing bias at the predetermined value even in such a situation when the CPU2 is disabled on account of a certain accident. Hence, even if the circuits before the D/A converter go out of order, the image formation may be executed and the excessive degradation of the image quality may be prevented. Here, the CPU1 denotes a microcomputer for sequence controlling.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17135079A JPS5695249A (en) | 1979-12-28 | 1979-12-28 | Image forming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17135079A JPS5695249A (en) | 1979-12-28 | 1979-12-28 | Image forming device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5695249A true JPS5695249A (en) | 1981-08-01 |
Family
ID=15921569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17135079A Pending JPS5695249A (en) | 1979-12-28 | 1979-12-28 | Image forming device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5695249A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57129453A (en) * | 1981-02-05 | 1982-08-11 | Ricoh Co Ltd | Multi-mode copying machine |
JPS58209755A (en) * | 1982-05-31 | 1983-12-06 | Canon Inc | Image formation |
JPS6291972A (en) * | 1985-10-18 | 1987-04-27 | Fuji Xerox Co Ltd | Copying machine |
JPS62109071A (en) * | 1985-11-04 | 1987-05-20 | スペクトラム、サイエンセズ、ベーヴェー | Feeder and bias controller |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53115233A (en) * | 1977-03-18 | 1978-10-07 | Ricoh Co Ltd | Control for electrophotogtaphic copier |
JPS53123919A (en) * | 1977-04-04 | 1978-10-28 | Canon Inc | Shutter operating device |
-
1979
- 1979-12-28 JP JP17135079A patent/JPS5695249A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53115233A (en) * | 1977-03-18 | 1978-10-07 | Ricoh Co Ltd | Control for electrophotogtaphic copier |
JPS53123919A (en) * | 1977-04-04 | 1978-10-28 | Canon Inc | Shutter operating device |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57129453A (en) * | 1981-02-05 | 1982-08-11 | Ricoh Co Ltd | Multi-mode copying machine |
JPS58209755A (en) * | 1982-05-31 | 1983-12-06 | Canon Inc | Image formation |
JPS6291972A (en) * | 1985-10-18 | 1987-04-27 | Fuji Xerox Co Ltd | Copying machine |
JPS62109071A (en) * | 1985-11-04 | 1987-05-20 | スペクトラム、サイエンセズ、ベーヴェー | Feeder and bias controller |
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