JPS5576361A - Electrophotographic copier - Google Patents
Electrophotographic copierInfo
- Publication number
- JPS5576361A JPS5576361A JP15028578A JP15028578A JPS5576361A JP S5576361 A JPS5576361 A JP S5576361A JP 15028578 A JP15028578 A JP 15028578A JP 15028578 A JP15028578 A JP 15028578A JP S5576361 A JPS5576361 A JP S5576361A
- Authority
- JP
- Japan
- Prior art keywords
- original
- detection
- density
- ground color
- color density
- 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 copied matter of high contrast corresponding to the originals with a simple constitution by performing the detection of the ground color density of the original through selective changing-over of plural photo detectors. CONSTITUTION:Plural photo sensors 14a thru 14e which detect the ground color density of the original 1 are disposed near a light source 2 in the direction perpendicular to the conveying direction of the original 1. These photo sensors 14a thru 14e consist of photo diodes, etc. and the detection signals thereof are selectively extracted by way of a select switch 15. The selected signals are amplified to the specified levels by a preamplifier 16, after which they are supplied to a density regulator 17, by which the detection of the ground color density of the original 1 is accomplished. The density regulator 17 performs the regulation of copying density through such things as regulation of the illuminance of the light source 2 and the development of bias voltage of a developing part 8 according to the results of the detection. In this way, the copied matter of high contrast may be obtained with the simple constitution.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15028578A JPS5576361A (en) | 1978-12-05 | 1978-12-05 | Electrophotographic copier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15028578A JPS5576361A (en) | 1978-12-05 | 1978-12-05 | Electrophotographic copier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5576361A true JPS5576361A (en) | 1980-06-09 |
Family
ID=15493627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15028578A Pending JPS5576361A (en) | 1978-12-05 | 1978-12-05 | Electrophotographic copier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5576361A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57201269A (en) * | 1981-06-05 | 1982-12-09 | Fuji Xerox Co Ltd | Controller for quantity of light of copying machine |
JPS58214144A (en) * | 1982-06-08 | 1983-12-13 | Canon Inc | Original density detector of variable power type copying machine |
JPS60162241A (en) * | 1984-01-31 | 1985-08-24 | Minolta Camera Co Ltd | Automatic exposure controller of microfilm reader/printer |
-
1978
- 1978-12-05 JP JP15028578A patent/JPS5576361A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57201269A (en) * | 1981-06-05 | 1982-12-09 | Fuji Xerox Co Ltd | Controller for quantity of light of copying machine |
JPS58214144A (en) * | 1982-06-08 | 1983-12-13 | Canon Inc | Original density detector of variable power type copying machine |
JPS60162241A (en) * | 1984-01-31 | 1985-08-24 | Minolta Camera Co Ltd | Automatic exposure controller of microfilm reader/printer |
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