JPS56143450A - Two-color electrophotographic copying method - Google Patents

Two-color electrophotographic copying method

Info

Publication number
JPS56143450A
JPS56143450A JP4730980A JP4730980A JPS56143450A JP S56143450 A JPS56143450 A JP S56143450A JP 4730980 A JP4730980 A JP 4730980A JP 4730980 A JP4730980 A JP 4730980A JP S56143450 A JPS56143450 A JP S56143450A
Authority
JP
Japan
Prior art keywords
copying
charging
constant
accordance
corona
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
JP4730980A
Other languages
Japanese (ja)
Inventor
Tsutomu Ishida
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 JP4730980A priority Critical patent/JPS56143450A/en
Publication of JPS56143450A publication Critical patent/JPS56143450A/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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0105—Details of unit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)

Abstract

PURPOSE:To keep almost constant the image densities of plural copies obtained successively, by gradually lowering the charging quantity of a photoreceptor depending on corona charging in accordance with repeating of the copying process in successive copying of plural sheets. CONSTITUTION:Photoreceptor 1 is formed into a cylinder, rotatable in the arrow direction, and surrounded with chargers 2, 3, optical exposure system 4, developing devices 5, 6, etc. arranged in the rotation direction around its circumference. Both the photoconductive layers of receptor 1 are corona-charged to polarities reverse to each other, and quantity of the first charging is set to a high value so as to obtain a sufficient image density in single sheet copying. In the case of successive copying on plural sheets, said charging quantity is gradually lowered in accordance with the progress of successive copying so as to keep copy image density almost constant.
JP4730980A 1980-04-10 1980-04-10 Two-color electrophotographic copying method Pending JPS56143450A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4730980A JPS56143450A (en) 1980-04-10 1980-04-10 Two-color electrophotographic copying method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4730980A JPS56143450A (en) 1980-04-10 1980-04-10 Two-color electrophotographic copying method

Publications (1)

Publication Number Publication Date
JPS56143450A true JPS56143450A (en) 1981-11-09

Family

ID=12771687

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4730980A Pending JPS56143450A (en) 1980-04-10 1980-04-10 Two-color electrophotographic copying method

Country Status (1)

Country Link
JP (1) JPS56143450A (en)

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