JPS55127575A - Control method of electrophotographic copier - Google Patents
Control method of electrophotographic copierInfo
- Publication number
- JPS55127575A JPS55127575A JP3423579A JP3423579A JPS55127575A JP S55127575 A JPS55127575 A JP S55127575A JP 3423579 A JP3423579 A JP 3423579A JP 3423579 A JP3423579 A JP 3423579A JP S55127575 A JPS55127575 A JP S55127575A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- comparator
- background density
- copy
- detector
- 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
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To obtain the copy of always stable background density by providing a reference circuit and comparator. CONSTITUTION:A comparator 16 connected with a bias correcting circuit 18 and reference circuit 19 is connected between a detector 10 which detects the toner image of a reference target and various control circuits 22. As a result of this, the background density detection signal of the detector 10 is inputted to the comparator 16 through the amplifying circuit 12 connected with a drift compensating circuit 13 and gain adjusting circuit 14 and sample holding circuit 15, where it is compared with the preset reference value from the reference circuit 19, by the results whereof, at least one of the exposure lamp control circuit 22b and charge current control circuit 22d is controlled by the specified control mode by way of a central control circuit 20 and output circuit 21, thus the copy having always the stable background density is obtained irrespective of ambient environments and aging.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3423579A JPS55127575A (en) | 1979-03-26 | 1979-03-26 | Control method of electrophotographic copier |
| PH23787A PH20926A (en) | 1979-03-26 | 1980-03-20 | Copy condition control method for electrophotographic copy machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3423579A JPS55127575A (en) | 1979-03-26 | 1979-03-26 | Control method of electrophotographic copier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55127575A true JPS55127575A (en) | 1980-10-02 |
Family
ID=12408480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3423579A Pending JPS55127575A (en) | 1979-03-26 | 1979-03-26 | Control method of electrophotographic copier |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS55127575A (en) |
| PH (1) | PH20926A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708915A (en) * | 1992-11-18 | 1998-01-13 | Sharp Kabushiki Kaisha | Image-quality stabilizer for use in an electrophotographic apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5393030A (en) * | 1977-01-27 | 1978-08-15 | Ricoh Co Ltd | Copying process control method of electrophotographic copying machine |
-
1979
- 1979-03-26 JP JP3423579A patent/JPS55127575A/en active Pending
-
1980
- 1980-03-20 PH PH23787A patent/PH20926A/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5393030A (en) * | 1977-01-27 | 1978-08-15 | Ricoh Co Ltd | Copying process control method of electrophotographic copying machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708915A (en) * | 1992-11-18 | 1998-01-13 | Sharp Kabushiki Kaisha | Image-quality stabilizer for use in an electrophotographic apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| PH20926A (en) | 1987-06-05 |
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