JPS57172362A - Corona discharging device - Google Patents
Corona discharging deviceInfo
- Publication number
- JPS57172362A JPS57172362A JP5797481A JP5797481A JPS57172362A JP S57172362 A JPS57172362 A JP S57172362A JP 5797481 A JP5797481 A JP 5797481A JP 5797481 A JP5797481 A JP 5797481A JP S57172362 A JPS57172362 A JP S57172362A
- Authority
- JP
- Japan
- Prior art keywords
- photosensitive drum
- contact
- discharge current
- conductor
- insulator
- 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)
Abstract
PURPOSE:To stabilize a discharge current, by providing a ring-shaped conductor partially on the surface of a photosensitive drum through an insulator and providing a contact which is always brought into contact with this conductor with a required contact pressure to detect the discharge current of the photosensitive drum. CONSTITUTION:A ring-shaped conductor 4 is provided partially on the surface of a photosensitive drum 2 through an insulator 3. A contact 5 is provided which is always brought into contact with the conductor 4 with a required contact pressure to detect the discharge current of the photosensitive drum 2. Meanwhile, a controlling circuit 10 of a DC corona discharging consists of a comparing circuit 11, a reference voltage setter 12, and a DC bias circuit 13 controlled by a DC bias voltage. By this constitution, a high voltage applied to the corona discharger is controlled to generate always a required stable discharge current of the photosensitive drum, and thus, the function of the copying machine is held for a long time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5797481A JPS57172362A (en) | 1981-04-17 | 1981-04-17 | Corona discharging device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5797481A JPS57172362A (en) | 1981-04-17 | 1981-04-17 | Corona discharging device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57172362A true JPS57172362A (en) | 1982-10-23 |
Family
ID=13070974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5797481A Pending JPS57172362A (en) | 1981-04-17 | 1981-04-17 | Corona discharging device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57172362A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4228560A1 (en) * | 1991-08-28 | 1993-03-11 | Sharp Kk | IMAGE GENERATION DEVICE |
-
1981
- 1981-04-17 JP JP5797481A patent/JPS57172362A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4228560A1 (en) * | 1991-08-28 | 1993-03-11 | Sharp Kk | IMAGE GENERATION DEVICE |
US5278612A (en) * | 1991-08-28 | 1994-01-11 | Sharp Kabushiki Kaisha | Apparatus for judging life of photoconductor |
DE4228560C2 (en) * | 1991-08-28 | 1999-07-29 | Sharp Kk | Imaging device |
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