JPS57120964A - Electrophotographic copying machine - Google Patents

Electrophotographic copying machine

Info

Publication number
JPS57120964A
JPS57120964A JP56007517A JP751781A JPS57120964A JP S57120964 A JPS57120964 A JP S57120964A JP 56007517 A JP56007517 A JP 56007517A JP 751781 A JP751781 A JP 751781A JP S57120964 A JPS57120964 A JP S57120964A
Authority
JP
Japan
Prior art keywords
photosensor
mirror
original
improve
photoreceptor
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
JP56007517A
Other languages
Japanese (ja)
Inventor
Yasuo Sawada
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 JP56007517A priority Critical patent/JPS57120964A/en
Publication of JPS57120964A publication Critical patent/JPS57120964A/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)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To improve the S/N ratio of a photosensor to improve the precision of auto-bias control, by placing a mirror for the photosensor in the front of a slit plate in the return mode of an illumination system and by evacuating the mirror from this position at an original scan time. CONSTITUTION:A mirror 11 for a photosensor is placed in a front center position 11A of an exposure slit plate 9 in the return mode where an illumination system is returned from the home position to an original scan start position, and the mirror 11 is evacuated to a position 11B at an original scan time. In this constitution, the strongest light of the original illumination part is received by a photosensor 12, and its maximum output corresponds to the reflection from the ground part of the original, and the surface potential of the ground part of a photoreceptor is obtained by the photosensitive characteristic figure of the photoreceptor, and a bias value is set automatically. Thus, the S/N ratio of the photosensor 12 is improved to improve the precision of auto-bias control.
JP56007517A 1981-01-20 1981-01-20 Electrophotographic copying machine Pending JPS57120964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56007517A JPS57120964A (en) 1981-01-20 1981-01-20 Electrophotographic copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56007517A JPS57120964A (en) 1981-01-20 1981-01-20 Electrophotographic copying machine

Publications (1)

Publication Number Publication Date
JPS57120964A true JPS57120964A (en) 1982-07-28

Family

ID=11667959

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56007517A Pending JPS57120964A (en) 1981-01-20 1981-01-20 Electrophotographic copying machine

Country Status (1)

Country Link
JP (1) JPS57120964A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59121075A (en) * 1982-12-27 1984-07-12 Canon Inc Image formation device
JPS59204054A (en) * 1983-05-06 1984-11-19 Canon Inc Copying machine
JPS6057358A (en) * 1983-09-07 1985-04-03 Matsushita Electric Ind Co Ltd Electrophotographic copying machine
JPS6161145A (en) * 1984-08-31 1986-03-28 Mita Ind Co Ltd Automatic exposure copying machine
JPS6161144A (en) * 1984-08-31 1986-03-28 Mita Ind Co Ltd Automatic exposure copying machine
JPS62109078A (en) * 1985-11-07 1987-05-20 Canon Inc Image recorder

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59121075A (en) * 1982-12-27 1984-07-12 Canon Inc Image formation device
JPS59204054A (en) * 1983-05-06 1984-11-19 Canon Inc Copying machine
JPS6057358A (en) * 1983-09-07 1985-04-03 Matsushita Electric Ind Co Ltd Electrophotographic copying machine
JPS6161145A (en) * 1984-08-31 1986-03-28 Mita Ind Co Ltd Automatic exposure copying machine
JPS6161144A (en) * 1984-08-31 1986-03-28 Mita Ind Co Ltd Automatic exposure copying machine
JPS62109078A (en) * 1985-11-07 1987-05-20 Canon Inc Image recorder

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