JPS55163545A - Two-color electrophotographic copying method and its device - Google Patents

Two-color electrophotographic copying method and its device

Info

Publication number
JPS55163545A
JPS55163545A JP7174879A JP7174879A JPS55163545A JP S55163545 A JPS55163545 A JP S55163545A JP 7174879 A JP7174879 A JP 7174879A JP 7174879 A JP7174879 A JP 7174879A JP S55163545 A JPS55163545 A JP S55163545A
Authority
JP
Japan
Prior art keywords
color
light
red
photoreceptor
positive
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
JP7174879A
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 JP7174879A priority Critical patent/JPS55163545A/en
Publication of JPS55163545A publication Critical patent/JPS55163545A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To form the sharp copies of uniformly high image density by radiating the light of the specific wavelengths to the surface of a photoreceptor between primary developing and secondary developing in the two-color electrophotographic copying method using the laminated photoreceptor.
CONSTITUTION: The photoreceptor P comprising laminating the 1st photoconductive layer 2 sensitive to red light and the 2nd photoconductive layer 3 which is insensitive to red color light, allows its transmission and is sensitive to other visible light on a conductive substrate 1 is used. The surface of the photoreceptor P is evenly primary-charged negative and in succession to this it is subjected to positive secondary charging slightly less than the above-mentioned charge amount, after which it is radiated with the light images of a two-color original 6, whereby the surface potentials of the photoreceptor regions Pa, Pb, Pc respectively corresponding to white-color ground part 6a, black-color part 6b and red-color part 6c are made zero, positive and negative. Next, the red-color part is subjected to primary development by positive-charged red-color toners 7, after which the light (for example, blue-color light) having sensitivity to only the 2nd photoconductive layer 3 is radiated over the entire surface to make the positive charging of the regions Pb strong, thence it is subjected to secondary development by negative-charged black-color toner 9.
COPYRIGHT: (C)1980,JPO&Japio
JP7174879A 1979-06-07 1979-06-07 Two-color electrophotographic copying method and its device Pending JPS55163545A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7174879A JPS55163545A (en) 1979-06-07 1979-06-07 Two-color electrophotographic copying method and its device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7174879A JPS55163545A (en) 1979-06-07 1979-06-07 Two-color electrophotographic copying method and its device

Publications (1)

Publication Number Publication Date
JPS55163545A true JPS55163545A (en) 1980-12-19

Family

ID=13469452

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7174879A Pending JPS55163545A (en) 1979-06-07 1979-06-07 Two-color electrophotographic copying method and its device

Country Status (1)

Country Link
JP (1) JPS55163545A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57144568A (en) * 1981-03-02 1982-09-07 Fuji Xerox Co Ltd Double-color electrophotographing method
JP2003536030A (en) * 2000-06-07 2003-12-02 エスケイエフ フランス Rolling bearing device with brake

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57144568A (en) * 1981-03-02 1982-09-07 Fuji Xerox Co Ltd Double-color electrophotographing method
JP2003536030A (en) * 2000-06-07 2003-12-02 エスケイエフ フランス Rolling bearing device with brake

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