JPS57102674A - Electrophotographic copying machine - Google Patents

Electrophotographic copying machine

Info

Publication number
JPS57102674A
JPS57102674A JP55178955A JP17895580A JPS57102674A JP S57102674 A JPS57102674 A JP S57102674A JP 55178955 A JP55178955 A JP 55178955A JP 17895580 A JP17895580 A JP 17895580A JP S57102674 A JPS57102674 A JP S57102674A
Authority
JP
Japan
Prior art keywords
photoreceptor
charged
compounded
image
red
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
JP55178955A
Other languages
Japanese (ja)
Inventor
Shuichi Karasawa
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 JP55178955A priority Critical patent/JPS57102674A/en
Publication of JPS57102674A publication Critical patent/JPS57102674A/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
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/01—Electrographic processes using a charge pattern for multicoloured copies

Landscapes

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

Abstract

PURPOSE:To reproduce a copy emphasized the desired portion in a complexed original image, by impregnating on a photoreceptor, dividing the charge voltage and developing bias voltage into plural modes, using a compounded photoreceptor. CONSTITUTION:The surface of a compounded photoreceptor 12 is charged in negative by a primary charger and is charged in positive by a secondary charger. A part of negative charge on the surface of the compounded photoreceptor 12 is neutralized and negative charge is induced to a conductive substrate 8. Consequently, the surface of the compounded photoreceptor 12 is changed to positive electric potential. Next, an original image with two colors of red and black is exposed and imaging on this surface. A area (a) corresponds to the black image, a area (b) corresponds to red image and a area (c) corresponds to the original base color. These become electric potential of the surface corresponding to the respective color. After this, image is developed by positive charged black toner and negative charged red toner to make it visible and then, it is transferred on the transferring paper. By means of this, two colored copy can be obtained. Partial by emphasis of the original can be performed by changing the visible condition of red and black of two colored copy, by combining control of charged voltage and developing bias voltage.
JP55178955A 1980-12-19 1980-12-19 Electrophotographic copying machine Pending JPS57102674A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55178955A JPS57102674A (en) 1980-12-19 1980-12-19 Electrophotographic copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55178955A JPS57102674A (en) 1980-12-19 1980-12-19 Electrophotographic copying machine

Publications (1)

Publication Number Publication Date
JPS57102674A true JPS57102674A (en) 1982-06-25

Family

ID=16057574

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55178955A Pending JPS57102674A (en) 1980-12-19 1980-12-19 Electrophotographic copying machine

Country Status (1)

Country Link
JP (1) JPS57102674A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60230166A (en) * 1984-04-27 1985-11-15 Toshiba Corp Image forming device
JPS60232566A (en) * 1984-05-02 1985-11-19 Toshiba Corp Image forming device
JPS60239764A (en) * 1984-05-15 1985-11-28 Canon Inc Copying device
JPS61208062A (en) * 1985-03-11 1986-09-16 Konishiroku Photo Ind Co Ltd Multicolor image forming device
JPS63157758U (en) * 1987-04-02 1988-10-17

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60230166A (en) * 1984-04-27 1985-11-15 Toshiba Corp Image forming device
JPS60232566A (en) * 1984-05-02 1985-11-19 Toshiba Corp Image forming device
JPS60239764A (en) * 1984-05-15 1985-11-28 Canon Inc Copying device
JPS61208062A (en) * 1985-03-11 1986-09-16 Konishiroku Photo Ind Co Ltd Multicolor image forming device
JPS63157758U (en) * 1987-04-02 1988-10-17

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