JPS57122452A - Control circuit for high-voltage power source of electrophotographic type printer - Google Patents

Control circuit for high-voltage power source of electrophotographic type printer

Info

Publication number
JPS57122452A
JPS57122452A JP55187734A JP18773480A JPS57122452A JP S57122452 A JPS57122452 A JP S57122452A JP 55187734 A JP55187734 A JP 55187734A JP 18773480 A JP18773480 A JP 18773480A JP S57122452 A JPS57122452 A JP S57122452A
Authority
JP
Japan
Prior art keywords
power source
voltage power
voltage
control circuit
electric
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
JP55187734A
Other languages
Japanese (ja)
Inventor
Takanobu Yasukake
Koji Sumiya
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.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki 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 Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Priority to JP55187734A priority Critical patent/JPS57122452A/en
Publication of JPS57122452A publication Critical patent/JPS57122452A/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)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To prevent abnormal electric discharge by interrupting the supply of an electric power source when the flow of eddy current to an electrostatic charger is detected. CONSTITUTION:When a voltage application signal HVPS is inputted to an electric power source driving circuit 12, the voltage of a high voltage power source 1 is applied to an electrostatic charger wire 6. When abnormal electric discharge begins to be initiated by sticking of a toner or the like and the electric current flowing in an electrostatic charger increases, the voltage drop in a resistance 3 increases. This is amplified with a differential amplifier 8, and is inputted to a comparator 11. As a result, the output of the comparator 11 drops, and the output of an AND gate 13 drops to zero, then the circuit 12 stops supplying power source to the charger, thereby preventing the abnormal discharge.
JP55187734A 1980-12-29 1980-12-29 Control circuit for high-voltage power source of electrophotographic type printer Pending JPS57122452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55187734A JPS57122452A (en) 1980-12-29 1980-12-29 Control circuit for high-voltage power source of electrophotographic type printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55187734A JPS57122452A (en) 1980-12-29 1980-12-29 Control circuit for high-voltage power source of electrophotographic type printer

Publications (1)

Publication Number Publication Date
JPS57122452A true JPS57122452A (en) 1982-07-30

Family

ID=16211247

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55187734A Pending JPS57122452A (en) 1980-12-29 1980-12-29 Control circuit for high-voltage power source of electrophotographic type printer

Country Status (1)

Country Link
JP (1) JPS57122452A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55166662A (en) * 1979-06-14 1980-12-25 Matsushita Electric Ind Co Ltd High-voltage power source device for copying machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55166662A (en) * 1979-06-14 1980-12-25 Matsushita Electric Ind Co Ltd High-voltage power source device for copying machine

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