JPS5790662A - Electrostatic charger for copying machine - Google Patents

Electrostatic charger for copying machine

Info

Publication number
JPS5790662A
JPS5790662A JP16712780A JP16712780A JPS5790662A JP S5790662 A JPS5790662 A JP S5790662A JP 16712780 A JP16712780 A JP 16712780A JP 16712780 A JP16712780 A JP 16712780A JP S5790662 A JPS5790662 A JP S5790662A
Authority
JP
Japan
Prior art keywords
charger
photoreceptor
case
current flowing
power source
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
JP16712780A
Other languages
Japanese (ja)
Inventor
Yuichi Kobayashi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP16712780A priority Critical patent/JPS5790662A/en
Publication of JPS5790662A publication Critical patent/JPS5790662A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)

Abstract

PURPOSE:To maintain the surface potential on a photoreceptor constant by detecting the electric current flowing in the case of a charger part, and changing the output of the charger by the detected current value thereby making the current flowing on the photoreceptor constant. CONSTITUTION:At the starting of a copying cycle, a relay RA is turned on simultaneously with the on signal of a higher voltage power source, and contacts RA2 opens so that the electric current which will be a reference for a charger 2 is supplied from the high voltage power source. Then, corona discharge is caused at the charger part, and electric current flows in the case of the charger and a photoreceptor 1. At this time the current flowing in the case is grounded through a resistance R1, and the voltage coresponding to the case current generates across the resistance R. Since the relay contacts RA1 are held closed, a capacitor C is charged up to the voltage across the resistance R, and if the relay is turned off after this, the contacts RA2 are closed and the voltage accumulated in the capacitor C is amplified and is applied to the high voltage power source, by which the output thereof is controlled and the discharge current flowing in the photoreceptor 1 is controlled constant.
JP16712780A 1980-11-27 1980-11-27 Electrostatic charger for copying machine Pending JPS5790662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16712780A JPS5790662A (en) 1980-11-27 1980-11-27 Electrostatic charger for copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16712780A JPS5790662A (en) 1980-11-27 1980-11-27 Electrostatic charger for copying machine

Publications (1)

Publication Number Publication Date
JPS5790662A true JPS5790662A (en) 1982-06-05

Family

ID=15843928

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16712780A Pending JPS5790662A (en) 1980-11-27 1980-11-27 Electrostatic charger for copying machine

Country Status (1)

Country Link
JP (1) JPS5790662A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4563387A (en) * 1983-06-30 1986-01-07 Takagi Chemicals, Inc. Cushioning material
US4572430A (en) * 1983-08-17 1986-02-25 Takagi Chemicals, Inc. Air conditioner for vehicular seat

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4563387A (en) * 1983-06-30 1986-01-07 Takagi Chemicals, Inc. Cushioning material
US4572430A (en) * 1983-08-17 1986-02-25 Takagi Chemicals, Inc. Air conditioner for vehicular seat

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