JPS5764253A - Negative and positive copying method - Google Patents

Negative and positive copying method

Info

Publication number
JPS5764253A
JPS5764253A JP55139557A JP13955780A JPS5764253A JP S5764253 A JPS5764253 A JP S5764253A JP 55139557 A JP55139557 A JP 55139557A JP 13955780 A JP13955780 A JP 13955780A JP S5764253 A JPS5764253 A JP S5764253A
Authority
JP
Japan
Prior art keywords
negative
positive
photosensitive body
layer
positive copying
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
JP55139557A
Other languages
Japanese (ja)
Inventor
Tsutomu Sato
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 JP55139557A priority Critical patent/JPS5764253A/en
Publication of JPS5764253A publication Critical patent/JPS5764253A/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
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/045—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To execute the negative and positive copying, by providing the first photoconductive layer on a conductive substrate, providing the second photoconductive layer on this first photoconductive layer directly or through an intermediate layer, using a 3-layer or 4-layer photosensitive body, and executing the forward and reverse corona charge, and exposure. CONSTITUTION:The negative and positive copying process is executed by operating each machine around the photosensitive body in order, turning the photosensitive body 1 at the same speed in the direction as indicated with an arrow. After the primary and secondary charge 2, 3, a picture is exposed, and a negative electrostatic latent image is formed by an AC corona charge 4. A red light lamp 21 emits light in case of the primary charge and irradiates uniformly. After that, the development 5, transfer 6 and fixing are executed. After transfer, the photosensitive body 1 is discharged by a discharge 7 and a discharge lamp 8, is cleaned by a cleaner 9, and the negative and positive copying process is completed. At the time of positive and positive copying, the device is operated in a state that a charger 4 has been stopped.
JP55139557A 1980-10-06 1980-10-06 Negative and positive copying method Pending JPS5764253A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55139557A JPS5764253A (en) 1980-10-06 1980-10-06 Negative and positive copying method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55139557A JPS5764253A (en) 1980-10-06 1980-10-06 Negative and positive copying method

Publications (1)

Publication Number Publication Date
JPS5764253A true JPS5764253A (en) 1982-04-19

Family

ID=15248028

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55139557A Pending JPS5764253A (en) 1980-10-06 1980-10-06 Negative and positive copying method

Country Status (1)

Country Link
JP (1) JPS5764253A (en)

Similar Documents

Publication Publication Date Title
JPS5612650A (en) Two-color electrophotographic developing method and its printing method
JPS5532050A (en) Composite-copying method of information image
JPS5782848A (en) Electrophotographing method
JPS5654473A (en) Electrophotographic copier
JPS5782850A (en) Electrophotographic method
JPS54112634A (en) Electrophotographic process and device
JPS54137345A (en) Development for dichronic zerography
JPS5782849A (en) Electrophotographing method
JPS55111976A (en) Electrophotographic copier
JPS5774767A (en) Electrophotographic device
JPS5562464A (en) Electrostatic latent image forming method
JPS55101973A (en) Electrophotographic copying method and apparatus thereof
JPS5515186A (en) Two-color image formation apparatus
JPS56156849A (en) Method and device for regular copying and reversal copying
JPS5774766A (en) Electrophotographic device
JPS54111831A (en) Electrophotography
JPS54101323A (en) Electrophotographic copier
JPS5473041A (en) Electrophotographic method
JPS5710151A (en) Preparation of montage image in copying machine
JPS5744157A (en) Deterioration preventing method for charge characteristic of photosensitive body
JPS5492734A (en) Image formation method and apparatus
JPS54143139A (en) Copying method for dichroic zerography
JPS5515151A (en) Electrophotographic method
JPS5655956A (en) Electrostatic printing method
JPS54155047A (en) Electrophotographic photoreceptor