JPS57120957A - Tri-color electrophotographic method - Google Patents

Tri-color electrophotographic method

Info

Publication number
JPS57120957A
JPS57120957A JP56005854A JP585481A JPS57120957A JP S57120957 A JPS57120957 A JP S57120957A JP 56005854 A JP56005854 A JP 56005854A JP 585481 A JP585481 A JP 585481A JP S57120957 A JPS57120957 A JP S57120957A
Authority
JP
Japan
Prior art keywords
toner
development
exposure
latent image
charged
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
JP56005854A
Other languages
Japanese (ja)
Inventor
Nobuyoshi Hoshi
Masayasu Anzai
Isamu Komatsu
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56005854A priority Critical patent/JPS57120957A/en
Publication of JPS57120957A publication Critical patent/JPS57120957A/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
    • G03G15/0142—Structure of complete machines
    • G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
    • G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
    • 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
    • G03G15/0142—Structure of complete machines
    • G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
    • G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
    • G03G15/0163—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member primary transfer to the final recording medium

Abstract

PURPOSE:To prevent the color mixture and the lowering of the development density in the tri-color recording, by performing the negative exposure and the inversion development in the first and the second exposure and development and by performing the positive exposure and the normal development in the third exposure and development. CONSTITUTION:When a recording material 1 charged uniformly is subjected to the first and the second negative exposure and inversion development, the quantity of charged electric charge of a toner 10 stuck to the second latent image 19 is made larger than that of a toner 6 stuck to the first latent image 18 to prevent the toner 10 from sticking onto the toner 6. Next, when the recording material 1 is subjected to positive exposure by the third light 21, the third latent image 22 becomes a positive latent image of a charged potential Vo, and places where toners 6 and 10 are stuck have respective toner potentials, and other regions have the residual potential, and they have a low potential together. Therefore, when the third latent image 22 is developed by the third toner 23 which is charged with the polarity opposite to that of the charged potential, the toner 23 does not stick onto toners 6 and 10. Consequently, the color mixture and the lowering of density are prevented.
JP56005854A 1981-01-20 1981-01-20 Tri-color electrophotographic method Pending JPS57120957A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56005854A JPS57120957A (en) 1981-01-20 1981-01-20 Tri-color electrophotographic method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56005854A JPS57120957A (en) 1981-01-20 1981-01-20 Tri-color electrophotographic method

Publications (1)

Publication Number Publication Date
JPS57120957A true JPS57120957A (en) 1982-07-28

Family

ID=11622566

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56005854A Pending JPS57120957A (en) 1981-01-20 1981-01-20 Tri-color electrophotographic method

Country Status (1)

Country Link
JP (1) JPS57120957A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60247265A (en) * 1984-05-23 1985-12-06 Japan Steel Works Ltd:The Two-color electrophotographic printing method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4837148A (en) * 1971-09-13 1973-06-01
JPS5564271A (en) * 1978-11-10 1980-05-14 Fujitsu Ltd Recording system
JPS55140864A (en) * 1979-04-20 1980-11-04 Fujitsu Ltd Electrophotographic recorder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4837148A (en) * 1971-09-13 1973-06-01
JPS5564271A (en) * 1978-11-10 1980-05-14 Fujitsu Ltd Recording system
JPS55140864A (en) * 1979-04-20 1980-11-04 Fujitsu Ltd Electrophotographic recorder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60247265A (en) * 1984-05-23 1985-12-06 Japan Steel Works Ltd:The Two-color electrophotographic printing method

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