JPS5587171A - Method and apparatus for electrophotography - Google Patents

Method and apparatus for electrophotography

Info

Publication number
JPS5587171A
JPS5587171A JP16140678A JP16140678A JPS5587171A JP S5587171 A JPS5587171 A JP S5587171A JP 16140678 A JP16140678 A JP 16140678A JP 16140678 A JP16140678 A JP 16140678A JP S5587171 A JPS5587171 A JP S5587171A
Authority
JP
Japan
Prior art keywords
positive
layer
charge
printing
uniformly
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
JP16140678A
Other languages
Japanese (ja)
Other versions
JPS6134677B2 (en
Inventor
Takashi Kitamura
Michio Ito
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP16140678A priority Critical patent/JPS5587171A/en
Priority to DE19792952471 priority patent/DE2952471A1/en
Publication of JPS5587171A publication Critical patent/JPS5587171A/en
Priority to US06/383,098 priority patent/US4486088A/en
Publication of JPS6134677B2 publication Critical patent/JPS6134677B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Electrophotography Using Other Than Carlson'S Method (AREA)

Abstract

PURPOSE: To realize positive-positive printing and negative-positive printing in one machine simultaneously, by uniformly charging the surface of insulating layer of photoreceptor, applying first image forming radiation, then applying second image forming radiation and charge in reverse polarity of the previous charge simultaneously, and then uniformly exposing the entire surface.
CONSTITUTION: A photosensitive plate A having photoconductive layer 2 and insulating layer 3 on a conductive supporting body 1 is, for exapmle, negatively charged by a corona discharger 4, then a positive charge 32 is induced in the vicinity of the body 1 of the layer 2. Then, when a first optical image is radiated, the positive charge 32 moves to the boundary of the layer 2 and layer 3 in bright part. Next, when second optical image radiation and positive recharge by a corona discharger 8 are applied simultaneously, the surface of the layer 3 in part I, II is positively charged, and the part IV is also positively charged. When exposed uniformly, the surface potential of parts I, II, IV is maintained almost constantly, and the surface potential of the layer 3 in part III drops suddenly. By developing the electrostatic image thus obtained, the images of positive-positive printing and negative- positive printing may be obtained simultaneously in one machine.
COPYRIGHT: (C)1980,JPO&Japio
JP16140678A 1978-12-26 1978-12-26 Method and apparatus for electrophotography Granted JPS5587171A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP16140678A JPS5587171A (en) 1978-12-26 1978-12-26 Method and apparatus for electrophotography
DE19792952471 DE2952471A1 (en) 1978-12-26 1979-12-27 ELECTROPHOTOGRAPHIC METHOD AND DEVICE FOR IMPLEMENTING IT
US06/383,098 US4486088A (en) 1978-12-26 1982-05-28 Method and apparatus for electrophotography capable of changing over images from positive to negative and vice versa

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16140678A JPS5587171A (en) 1978-12-26 1978-12-26 Method and apparatus for electrophotography

Publications (2)

Publication Number Publication Date
JPS5587171A true JPS5587171A (en) 1980-07-01
JPS6134677B2 JPS6134677B2 (en) 1986-08-08

Family

ID=15734477

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16140678A Granted JPS5587171A (en) 1978-12-26 1978-12-26 Method and apparatus for electrophotography

Country Status (1)

Country Link
JP (1) JPS5587171A (en)

Also Published As

Publication number Publication date
JPS6134677B2 (en) 1986-08-08

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