JPS55127573A - Gain adjusting method of toner image detector in electrophotographic copier - Google Patents
Gain adjusting method of toner image detector in electrophotographic copierInfo
- Publication number
- JPS55127573A JPS55127573A JP3423379A JP3423379A JPS55127573A JP S55127573 A JPS55127573 A JP S55127573A JP 3423379 A JP3423379 A JP 3423379A JP 3423379 A JP3423379 A JP 3423379A JP S55127573 A JPS55127573 A JP S55127573A
- Authority
- JP
- Japan
- Prior art keywords
- detector
- amplifying circuit
- gain adjusting
- gain
- circuit
- 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
- Developing For Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To improve detection accuracy by controlling the gain of the amplifying circuit of the stage next to the detector. CONSTITUTION:A gain adjusting circuit 14 is connected to the amplifying circuit 12 of the stage next to a detector 10 which detects the state of photoreceptor surface. Then, when the start switch of the copying machine body is pushed, a drift compensating circuit 13 operates to compensate the drift amount of the detector 10 and amplifying circuit 12, after which the detector 10 and amplifier 12 are operated then the reflected light of the photoreceptor surface which is not exposed and developed is detected by the detector 10 and is inputted to the gain adjusting circuit 14 through the amplifying circuit 12, thus the always fixed output irrespective of the stains, etc. of the detector 10 is outputted to the amplifying circuit 12, whereby the gain is controlled. Hence, the detection of the toner image may be accomplished always under the same conditions and the detection accuracy is improved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3423379A JPS55127573A (en) | 1979-03-26 | 1979-03-26 | Gain adjusting method of toner image detector in electrophotographic copier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3423379A JPS55127573A (en) | 1979-03-26 | 1979-03-26 | Gain adjusting method of toner image detector in electrophotographic copier |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55127573A true JPS55127573A (en) | 1980-10-02 |
JPH0314186B2 JPH0314186B2 (en) | 1991-02-26 |
Family
ID=12408424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3423379A Granted JPS55127573A (en) | 1979-03-26 | 1979-03-26 | Gain adjusting method of toner image detector in electrophotographic copier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55127573A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5633661A (en) * | 1979-08-29 | 1981-04-04 | Toshiba Corp | Copying machine |
JPH0297979A (en) * | 1988-10-05 | 1990-04-10 | Toshiba Corp | Exposure controller |
JPH02197860A (en) * | 1989-01-27 | 1990-08-06 | Ricoh Co Ltd | Image forming device |
JPH0341478A (en) * | 1989-07-07 | 1991-02-21 | Konica Corp | Image density reader |
JPH0341484A (en) * | 1989-07-07 | 1991-02-21 | Konica Corp | Image density reader |
JPH06317524A (en) * | 1993-05-10 | 1994-11-15 | Sharp Corp | Automatic image compensation control device |
US5402209A (en) * | 1992-08-27 | 1995-03-28 | Sharp Kabushiki Kaisha | Electrophotographic reproduction apparatus controllable toner density and method thereof for controlling an electrophotographic reproduction process |
Citations (2)
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 |
JPS546561A (en) * | 1977-06-16 | 1979-01-18 | Toshiba Corp | Developer concentration controller |
-
1979
- 1979-03-26 JP JP3423379A patent/JPS55127573A/en active Granted
Patent Citations (2)
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 |
JPS546561A (en) * | 1977-06-16 | 1979-01-18 | Toshiba Corp | Developer concentration controller |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5633661A (en) * | 1979-08-29 | 1981-04-04 | Toshiba Corp | Copying machine |
JPS6360389B2 (en) * | 1979-08-29 | 1988-11-24 | ||
JPH0297979A (en) * | 1988-10-05 | 1990-04-10 | Toshiba Corp | Exposure controller |
JPH02197860A (en) * | 1989-01-27 | 1990-08-06 | Ricoh Co Ltd | Image forming device |
JPH0341478A (en) * | 1989-07-07 | 1991-02-21 | Konica Corp | Image density reader |
JPH0341484A (en) * | 1989-07-07 | 1991-02-21 | Konica Corp | Image density reader |
US5402209A (en) * | 1992-08-27 | 1995-03-28 | Sharp Kabushiki Kaisha | Electrophotographic reproduction apparatus controllable toner density and method thereof for controlling an electrophotographic reproduction process |
JPH06317524A (en) * | 1993-05-10 | 1994-11-15 | Sharp Corp | Automatic image compensation control device |
Also Published As
Publication number | Publication date |
---|---|
JPH0314186B2 (en) | 1991-02-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS55157756A (en) | Surface potential control unit | |
JPS55112585A (en) | Photo detection unit of moving object | |
JPS5272233A (en) | Detector for paper jam in the electrophotographic copying machine | |
JPS53136838A (en) | Automatic controlling method of image quality in transfer type electrostatic copier | |
JPS55127573A (en) | Gain adjusting method of toner image detector in electrophotographic copier | |
JPS57200054A (en) | Picture forming device | |
JPS5486347A (en) | Development stabilizing system | |
JPS5611466A (en) | Electrophotographic copier using belt photoreceptor | |
JPS5393835A (en) | Copy picture quality controller of electrostatic copying machine | |
JPS5776562A (en) | Electrophotographic cpier | |
JPS56158356A (en) | Density control method for developer | |
JPS57120964A (en) | Electrophotographic copying machine | |
JPS55106470A (en) | Printing density control unit | |
JPS55127574A (en) | Drift compensating method of toner density detector in electrophotographic copier | |
JPS56161555A (en) | Controller of electrophotographic copying machine | |
JPS5785070A (en) | Control device for copying density of electrophotographic copier | |
JPS57164739A (en) | Copying apparatus | |
JPS5536856A (en) | High voltage power source device for electrophotographic copier | |
JPS56150762A (en) | Control method for surface potential of photoreceptor of electrophotographic copier | |
JPS56128961A (en) | Copying machine | |
JPS56161557A (en) | Method for controlling electrophotographic copying machine | |
JPS53103736A (en) | Auto-bias development for xerographic copying machine | |
JPS5729061A (en) | Detector for remaining amount of toner of electrophotographic copier | |
JPS5770552A (en) | Circuit for compensating deterioration of standard density pattern | |
JPS5395030A (en) | Developing bias voltage controller |