JPS57125952A - Display device for corotron requiring check - Google Patents
Display device for corotron requiring checkInfo
- Publication number
- JPS57125952A JPS57125952A JP56012617A JP1261781A JPS57125952A JP S57125952 A JPS57125952 A JP S57125952A JP 56012617 A JP56012617 A JP 56012617A JP 1261781 A JP1261781 A JP 1261781A JP S57125952 A JPS57125952 A JP S57125952A
- Authority
- JP
- Japan
- Prior art keywords
- comparator
- corotron
- display device
- source
- check
- 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
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
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0266—Arrangements for controlling the amount of charge
-
- 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
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0291—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices corona discharge devices, e.g. wires, pointed electrodes, means for cleaning the corona discharge device
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To prevent the degradation in copying quality by providing a comparator which detects the dynamic electric current between a photoreceptor and a Corotron wire, and generates a check require signal from the detection signal thereof and a reference signal. CONSTITUTION:A high voltage source 3 is connected to a Corotron 2 applying electric charge to a photosensitive drum 7, and for example, a detection resistance R is connected between a photosensitive drum 1 and the source 3 in order to detect the dynamic electric current Di flowing from the Corotron wire 4 in the Corotron 2 to the drum 1. The terminal voltage thereof is connected to one input of a comparator 6 via a buffer and a converter 5. This buffer/converter 5 converts the terminal voltage of the resistance R to the analog voltage suited for inputting to the comparator 6, and protects the comparator 6 against the source 3. The other input of the comparator 6 is connected to a potentiometer 7 giving a reference value Rf, and the output thereof is connected to a display device 8. When the current Di lowers below the reference value Rf, the comparator 6 emits a display the Corotron requiring check to the display device 8.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56012617A JPS57125952A (en) | 1981-01-30 | 1981-01-30 | Display device for corotron requiring check |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56012617A JPS57125952A (en) | 1981-01-30 | 1981-01-30 | Display device for corotron requiring check |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57125952A true JPS57125952A (en) | 1982-08-05 |
Family
ID=11810333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56012617A Pending JPS57125952A (en) | 1981-01-30 | 1981-01-30 | Display device for corotron requiring check |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57125952A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6259980A (en) * | 1985-09-10 | 1987-03-16 | Canon Inc | Image forming device |
JPS6259978A (en) * | 1985-09-10 | 1987-03-16 | Canon Inc | Image forming device |
JPS6259979A (en) * | 1985-09-10 | 1987-03-16 | Canon Inc | Power unit |
-
1981
- 1981-01-30 JP JP56012617A patent/JPS57125952A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6259980A (en) * | 1985-09-10 | 1987-03-16 | Canon Inc | Image forming device |
JPS6259978A (en) * | 1985-09-10 | 1987-03-16 | Canon Inc | Image forming device |
JPS6259979A (en) * | 1985-09-10 | 1987-03-16 | Canon Inc | Power unit |
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