JPS56144440A - Dichromatic electrophotographic copying method - Google Patents

Dichromatic electrophotographic copying method

Info

Publication number
JPS56144440A
JPS56144440A JP4883480A JP4883480A JPS56144440A JP S56144440 A JPS56144440 A JP S56144440A JP 4883480 A JP4883480 A JP 4883480A JP 4883480 A JP4883480 A JP 4883480A JP S56144440 A JPS56144440 A JP S56144440A
Authority
JP
Japan
Prior art keywords
charging
exposure
photoreceptor
dichromatic
started
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
JP4883480A
Other languages
Japanese (ja)
Other versions
JPH0143305B2 (en
Inventor
Shuichi Tsushima
Masaaki Umehara
Fuyuhiko Matsumoto
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 JP4883480A priority Critical patent/JPS56144440A/en
Publication of JPS56144440A publication Critical patent/JPS56144440A/en
Publication of JPH0143305B2 publication Critical patent/JPH0143305B2/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
    • 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)

Abstract

PURPOSE:To obtain an image free from an edge effect by subjecting a photoreceptor to primary charging at positive polarity by means of a corona charger while uniformly irradiating the photoreceptor with red light and then exposing the photoreceptor through a dichromatic original in 4 modes in the midst of secondary charging at the reverse polarity to the primary charging. CONSTITUTION:The photoreceptor having two photoconductive layers on electrically conductive substrate 1C is charged positively and uniformly by means of corona charger 2 while being uniformly irradiated with red light LR. In the midst of secondary charging by means of charger 3 with the reverse polarity, the secondary charging is synchronized with exposure. Both the processes are started simultaneously to finish the exposure before the charging, the exposure is started after the charging to finish both the processes simultaneously, or the charging is started before the exposure and finished after the exposure. Dichromatic development is then carried out, and by uniform charging at predetermined polarities and transfer at the reverse polarities an image free from an edge effect is obtd.
JP4883480A 1980-04-14 1980-04-14 Dichromatic electrophotographic copying method Granted JPS56144440A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4883480A JPS56144440A (en) 1980-04-14 1980-04-14 Dichromatic electrophotographic copying method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4883480A JPS56144440A (en) 1980-04-14 1980-04-14 Dichromatic electrophotographic copying method

Publications (2)

Publication Number Publication Date
JPS56144440A true JPS56144440A (en) 1981-11-10
JPH0143305B2 JPH0143305B2 (en) 1989-09-20

Family

ID=12814264

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4883480A Granted JPS56144440A (en) 1980-04-14 1980-04-14 Dichromatic electrophotographic copying method

Country Status (1)

Country Link
JP (1) JPS56144440A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594302A (en) * 1984-05-31 1986-06-10 Mita Industrial Co., Ltd. Developing process for two-colored electrophotography

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417846A (en) * 1977-07-11 1979-02-09 Ricoh Co Ltd Dichromatic electrophotographic copying method
JPS5543532A (en) * 1978-09-21 1980-03-27 Ricoh Co Ltd Two color electrophotographic copying method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417846A (en) * 1977-07-11 1979-02-09 Ricoh Co Ltd Dichromatic electrophotographic copying method
JPS5543532A (en) * 1978-09-21 1980-03-27 Ricoh Co Ltd Two color electrophotographic copying method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594302A (en) * 1984-05-31 1986-06-10 Mita Industrial Co., Ltd. Developing process for two-colored electrophotography

Also Published As

Publication number Publication date
JPH0143305B2 (en) 1989-09-20

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