JPS5776562A - Electrophotographic cpier - Google Patents
Electrophotographic cpierInfo
- Publication number
- JPS5776562A JPS5776562A JP55152027A JP15202780A JPS5776562A JP S5776562 A JPS5776562 A JP S5776562A JP 55152027 A JP55152027 A JP 55152027A JP 15202780 A JP15202780 A JP 15202780A JP S5776562 A JPS5776562 A JP S5776562A
- Authority
- JP
- Japan
- Prior art keywords
- value
- photosensor
- original
- bias
- cpu14
- 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
- 238000001514 detection method Methods 0.000 abstract 2
- 239000000428 dust Substances 0.000 abstract 2
- 230000003287 optical effect Effects 0.000 abstract 2
- 239000002689 soil Substances 0.000 abstract 2
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 238000005513 bias potential Methods 0.000 abstract 1
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)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To prevent not only a faulty working of a copier due to the dust on an original and other factors but the soil on the surface of a copy sheet, by detecting a part of an optical image which gives an exposure to a drum through a photosensor and then setting the bias value of development with the mean value of those higher than the reference value among the detection outputs of the above-mentioned photosensor. CONSTITUTION:An original dividing mirror 10 divides a part of an optical image of an original 1 that gives an exposure to a photosensitive drum 9, and a photosensor 11 receives the divided beams. In such constitution, the detection signal of the sensor 11 is supplied to a CPU14 via an amplifying circuit 12 and an A/D converter 13. The value less than the reference value B is cut at the CPU14 to calculate the mean value of the signals at the texture part, and this output controls the output of a bias power supply 17 via a D/A converter 15 and a bias potential control circuit 16. In such way, the low bias application is eliminated although an abnormal value like signal C is caused by the dust. Thus the soil can be prevented on the surface of a copy sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55152027A JPS5776562A (en) | 1980-10-31 | 1980-10-31 | Electrophotographic cpier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55152027A JPS5776562A (en) | 1980-10-31 | 1980-10-31 | Electrophotographic cpier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5776562A true JPS5776562A (en) | 1982-05-13 |
Family
ID=15531452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55152027A Pending JPS5776562A (en) | 1980-10-31 | 1980-10-31 | Electrophotographic cpier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5776562A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6010267A (en) * | 1983-06-30 | 1985-01-19 | Canon Inc | image forming device |
| JPS6010269A (en) * | 1983-06-30 | 1985-01-19 | Canon Inc | image forming device |
| JPS6010268A (en) * | 1983-06-30 | 1985-01-19 | Canon Inc | Image processor |
| JPS6035751A (en) * | 1983-08-06 | 1985-02-23 | Canon Inc | image forming device |
| JPS6053965A (en) * | 1983-09-05 | 1985-03-28 | Canon Inc | Image recording control device |
| JPS60239729A (en) * | 1984-05-14 | 1985-11-28 | Sharp Corp | Automatic exposure adjusting device |
| US4607954A (en) * | 1983-02-26 | 1986-08-26 | Mita Kogyo Kabushiki Kaisha | Automatic developing bias control device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5393835A (en) * | 1977-01-28 | 1978-08-17 | Ricoh Co Ltd | Copy picture quality controller of electrostatic copying machine |
| JPS5446560A (en) * | 1977-09-20 | 1979-04-12 | Ricoh Co Ltd | Automatic texture blot compensating device |
| JPS5461535A (en) * | 1977-10-25 | 1979-05-17 | Ricoh Co Ltd | Image density control device |
-
1980
- 1980-10-31 JP JP55152027A patent/JPS5776562A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5393835A (en) * | 1977-01-28 | 1978-08-17 | Ricoh Co Ltd | Copy picture quality controller of electrostatic copying machine |
| JPS5446560A (en) * | 1977-09-20 | 1979-04-12 | Ricoh Co Ltd | Automatic texture blot compensating device |
| JPS5461535A (en) * | 1977-10-25 | 1979-05-17 | Ricoh Co Ltd | Image density control device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4607954A (en) * | 1983-02-26 | 1986-08-26 | Mita Kogyo Kabushiki Kaisha | Automatic developing bias control device |
| JPS6010267A (en) * | 1983-06-30 | 1985-01-19 | Canon Inc | image forming device |
| JPS6010269A (en) * | 1983-06-30 | 1985-01-19 | Canon Inc | image forming device |
| JPS6010268A (en) * | 1983-06-30 | 1985-01-19 | Canon Inc | Image processor |
| JPS6035751A (en) * | 1983-08-06 | 1985-02-23 | Canon Inc | image forming device |
| JPS6053965A (en) * | 1983-09-05 | 1985-03-28 | Canon Inc | Image recording control device |
| JPS60239729A (en) * | 1984-05-14 | 1985-11-28 | Sharp Corp | Automatic exposure adjusting device |
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