JPS57181568A - Electrophotographic copying machine - Google Patents

Electrophotographic copying machine

Info

Publication number
JPS57181568A
JPS57181568A JP56067511A JP6751181A JPS57181568A JP S57181568 A JPS57181568 A JP S57181568A JP 56067511 A JP56067511 A JP 56067511A JP 6751181 A JP6751181 A JP 6751181A JP S57181568 A JPS57181568 A JP S57181568A
Authority
JP
Japan
Prior art keywords
potential
developing bias
electrostatic latent
developing
latent image
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.)
Granted
Application number
JP56067511A
Other languages
Japanese (ja)
Other versions
JPH031664B2 (en
Inventor
Yutaka Irie
Koji Matsushita
Hiroshi Okamoto
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP56067511A priority Critical patent/JPS57181568A/en
Publication of JPS57181568A publication Critical patent/JPS57181568A/en
Publication of JPH031664B2 publication Critical patent/JPH031664B2/ja
Granted 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 copying original images of different densities in background parts satisfactorily by changing the correlative relations between reference electrostatic latent image potential and developing bias potential in correspondence to the change in the quantity of exposure light. CONSTITUTION:The potential of the reference electrostatic latent image on a photosensitive drum 1 formed of reference charts 4a, 4b of medium contrast id detected with a surface potential detector 14. In accordance with this, a developing bias control circuit 43 controls an electric power supply 44 for developing bais, and supplies the developing bias of the potential having a constant correlative relation corresponding to the detected reference electrostatic latent image potential to a developing electrode 16. When the image exposure is adjusted, the circuit 43 changes the correlative relation cooperatively with the change in the quantity of exposure light, thereby changing the developing bias voltage. In this way, the image reproducibility in the low density parts is changed, and the original images of different densities in the background parts are copied satisfactorily.
JP56067511A 1981-05-02 1981-05-02 Electrophotographic copying machine Granted JPS57181568A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56067511A JPS57181568A (en) 1981-05-02 1981-05-02 Electrophotographic copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56067511A JPS57181568A (en) 1981-05-02 1981-05-02 Electrophotographic copying machine

Publications (2)

Publication Number Publication Date
JPS57181568A true JPS57181568A (en) 1982-11-09
JPH031664B2 JPH031664B2 (en) 1991-01-11

Family

ID=13347073

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56067511A Granted JPS57181568A (en) 1981-05-02 1981-05-02 Electrophotographic copying machine

Country Status (1)

Country Link
JP (1) JPS57181568A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59159153A (en) * 1983-02-28 1984-09-08 Canon Inc Reproducing and outputting device of image
JPS60249166A (en) * 1984-05-24 1985-12-09 Canon Inc Method for adjusting image density of electrophotograph

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5317339A (en) * 1976-07-30 1978-02-17 Canon Inc Method and device for stabilizing surface potential
JPS5499632A (en) * 1978-01-24 1979-08-06 Ricoh Co Ltd Image adjusting method of copying machines
JPS55127572A (en) * 1979-03-26 1980-10-02 Fuji Xerox Co Ltd Control unit of electrophotographic copier
JPS55127571A (en) * 1979-03-26 1980-10-02 Fuji Xerox Co Ltd Control method of electrophotographic copier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5317339A (en) * 1976-07-30 1978-02-17 Canon Inc Method and device for stabilizing surface potential
JPS5499632A (en) * 1978-01-24 1979-08-06 Ricoh Co Ltd Image adjusting method of copying machines
JPS55127572A (en) * 1979-03-26 1980-10-02 Fuji Xerox Co Ltd Control unit of electrophotographic copier
JPS55127571A (en) * 1979-03-26 1980-10-02 Fuji Xerox Co Ltd Control method of electrophotographic copier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59159153A (en) * 1983-02-28 1984-09-08 Canon Inc Reproducing and outputting device of image
JPS60249166A (en) * 1984-05-24 1985-12-09 Canon Inc Method for adjusting image density of electrophotograph

Also Published As

Publication number Publication date
JPH031664B2 (en) 1991-01-11

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