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JPS5717967A - Controller for development bias voltage in copying machine - Google Patents

Controller for development bias voltage in copying machine

Info

Publication number
JPS5717967A
JPS5717967A JP9157280A JP9157280A JPS5717967A JP S5717967 A JPS5717967 A JP S5717967A JP 9157280 A JP9157280 A JP 9157280A JP 9157280 A JP9157280 A JP 9157280A JP S5717967 A JPS5717967 A JP S5717967A
Authority
JP
Japan
Prior art keywords
voltage
development bias
high voltage
deviation
signal
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
JP9157280A
Other languages
Japanese (ja)
Inventor
Minoru Aoki
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 JP9157280A priority Critical patent/JPS5717967A/en
Publication of JPS5717967A publication Critical patent/JPS5717967A/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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/065—Arrangements for controlling the potential of the developing electrode

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To simplify constitution of a voltage controller by applying a signal with a required magnitude to a deviation signal of a negative feedback type electrometer detecting electrostatic latent image potential in a white ground part of a manuscript and by using an output of the electrometer as development bias voltage. CONSTITUTION:Deviation electrostatic latent image potential taking, as reference, potential by an electric field fluctuation device C corresponding to a manuscript white ground part of a photosensitive drum 1 is detected with an electric field voltage converter A of a probe P of a negative feedback type potentiometer further in response to this deviation electric potential, high voltage of a high voltage power source HT is applied to voltage detected by a synchronous detector C of a main body part MB by a high voltage controlling circuit E, allowing the potentiometer NFEM to be controlled with negative feedback. Accordingly when an output of the potentiometer NFEM is applied as developing bath voltage to a development electrode 2a of a developing device 2, development bias voltage control stable over a long period is performed with simple constitution that uses the electrometer and a high voltage source for a development bias together. Further also when a signal with required polarity or a phase is applied to the deviation signal, the same can be done.
JP9157280A 1980-07-04 1980-07-04 Controller for development bias voltage in copying machine Pending JPS5717967A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9157280A JPS5717967A (en) 1980-07-04 1980-07-04 Controller for development bias voltage in copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9157280A JPS5717967A (en) 1980-07-04 1980-07-04 Controller for development bias voltage in copying machine

Publications (1)

Publication Number Publication Date
JPS5717967A true JPS5717967A (en) 1982-01-29

Family

ID=14030235

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9157280A Pending JPS5717967A (en) 1980-07-04 1980-07-04 Controller for development bias voltage in copying machine

Country Status (1)

Country Link
JP (1) JPS5717967A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4920097A (en) * 1972-06-16 1974-02-22
JPS5020731A (en) * 1973-05-14 1975-03-05
JPS5149035A (en) * 1974-10-08 1976-04-27 Ricoh Kk

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4920097A (en) * 1972-06-16 1974-02-22
JPS5020731A (en) * 1973-05-14 1975-03-05
JPS5149035A (en) * 1974-10-08 1976-04-27 Ricoh Kk

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