JPS5687058A - Two-color electrophotographic recorder - Google Patents

Two-color electrophotographic recorder

Info

Publication number
JPS5687058A
JPS5687058A JP16445979A JP16445979A JPS5687058A JP S5687058 A JPS5687058 A JP S5687058A JP 16445979 A JP16445979 A JP 16445979A JP 16445979 A JP16445979 A JP 16445979A JP S5687058 A JPS5687058 A JP S5687058A
Authority
JP
Japan
Prior art keywords
drum
latent image
positively
potential
exposed
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
JP16445979A
Other languages
Japanese (ja)
Inventor
Masayuki Hida
Junzo Nakajima
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16445979A priority Critical patent/JPS5687058A/en
Publication of JPS5687058A publication Critical patent/JPS5687058A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To carry out sharp 2-color recording on a photosensitive drum without mixing of 2-color toners, by conducting formation of the first latent image and its development, then formation of the second latent image and its development. CONSTITUTION:Potential VS is given to photosensitive drum 5 with charger 7, drum 5 is exposed positively with exposing means 12, and a latent image is formed, with potential VL of its exposed areas controlled to about 1/2 of VS. The latent image is developed positively with black toner 20 having negative charge in first developing device 13. Then, drum 5 is positively exposed with second exposing means 15 so as to render the potential of the exposed areas nearly zero V, and developed positively with red toner 21 having negative charge in second developing device 16. At that time, developing bias voltage is kept at about zero V, thus permitting an image of black and red toners to be formed on drum 5, and sharp 2-color recording to be made on drum 5 without mixing of 2-color toners in such a structure.
JP16445979A 1979-12-18 1979-12-18 Two-color electrophotographic recorder Pending JPS5687058A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16445979A JPS5687058A (en) 1979-12-18 1979-12-18 Two-color electrophotographic recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16445979A JPS5687058A (en) 1979-12-18 1979-12-18 Two-color electrophotographic recorder

Publications (1)

Publication Number Publication Date
JPS5687058A true JPS5687058A (en) 1981-07-15

Family

ID=15793569

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16445979A Pending JPS5687058A (en) 1979-12-18 1979-12-18 Two-color electrophotographic recorder

Country Status (1)

Country Link
JP (1) JPS5687058A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6050553A (en) * 1983-08-30 1985-03-20 Fujitsu Ltd Multicolor electronic recording method
JPS61201274A (en) * 1985-03-04 1986-09-05 Canon Inc Image forming device
JPH0312260U (en) * 1990-06-28 1991-02-07
US5280362A (en) * 1990-06-15 1994-01-18 Ricoh Company, Ltd. Digital copier for copying a bicolored document at the same speed as a monocolored document

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6050553A (en) * 1983-08-30 1985-03-20 Fujitsu Ltd Multicolor electronic recording method
JPH0428306B2 (en) * 1983-08-30 1992-05-14 Fujitsu Ltd
JPS61201274A (en) * 1985-03-04 1986-09-05 Canon Inc Image forming device
US5280362A (en) * 1990-06-15 1994-01-18 Ricoh Company, Ltd. Digital copier for copying a bicolored document at the same speed as a monocolored document
JPH0312260U (en) * 1990-06-28 1991-02-07

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