JPS57172362A - Corona discharging device - Google Patents

Corona discharging device

Info

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
Application number
JP5797481A
Other languages
Japanese (ja)
Inventor
Hidefumi Kanai
Shigeru Shimizu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Finetech Nisca Inc
Original Assignee
Copyer Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Copyer Co Ltd filed Critical Copyer Co Ltd
Priority to JP5797481A priority Critical patent/JPS57172362A/en
Publication of JPS57172362A publication Critical patent/JPS57172362A/en
Pending legal-status Critical Current

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

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.
JP5797481A 1981-04-17 1981-04-17 Corona discharging device Pending JPS57172362A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228560A1 (en) * 1991-08-28 1993-03-11 Sharp Kk IMAGE GENERATION DEVICE

Cited By (3)

* Cited by examiner, † Cited by third party
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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