JPS572057A - Preventing device for overall black surface formation of electronic copying machine - Google Patents

Preventing device for overall black surface formation of electronic copying machine

Info

Publication number
JPS572057A
JPS572057A JP7508680A JP7508680A JPS572057A JP S572057 A JPS572057 A JP S572057A JP 7508680 A JP7508680 A JP 7508680A JP 7508680 A JP7508680 A JP 7508680A JP S572057 A JPS572057 A JP S572057A
Authority
JP
Japan
Prior art keywords
original
copying machine
electronic copying
photosensitive drum
preventing device
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
JP7508680A
Other languages
Japanese (ja)
Inventor
Masao Satoyoshi
Hiromitsu Yagi
Kazuyoshi Matsuo
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 JP7508680A priority Critical patent/JPS572057A/en
Publication of JPS572057A publication Critical patent/JPS572057A/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
    • G03G15/047—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 for discharging non-image areas

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To obtain a beautiful copy, by sensitizing a photosensitive drum by lighting an erase lamp, in an area where there is no original. CONSTITUTION:Plural erase lamps 4-1, 4-2-4-n are provided in the proximity of a photosensitive drum 1 so as to separately irradiate plural specific areas of the photosensitive drum 1 of an electronic copying machine, and on the other hand, photodetecting elements 6-1, 6-2-6-n are provided so as to detect reflection rays from areas on an original table 7, which correspond to said respective areas. And, it is prevented that a part where there is no original on copying paper is copied in black, by lighting the erase lamps 4-1, 4-2-4-n which correspond to each part where there is no original, with the signals of the photodetecting elements 6-1, 6-2- 6-n.
JP7508680A 1980-06-04 1980-06-04 Preventing device for overall black surface formation of electronic copying machine Pending JPS572057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7508680A JPS572057A (en) 1980-06-04 1980-06-04 Preventing device for overall black surface formation of electronic copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7508680A JPS572057A (en) 1980-06-04 1980-06-04 Preventing device for overall black surface formation of electronic copying machine

Publications (1)

Publication Number Publication Date
JPS572057A true JPS572057A (en) 1982-01-07

Family

ID=13566006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7508680A Pending JPS572057A (en) 1980-06-04 1980-06-04 Preventing device for overall black surface formation of electronic copying machine

Country Status (1)

Country Link
JP (1) JPS572057A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737748A (en) * 1984-07-20 1988-04-12 Minolta Camera Kabushiki Kaisha Copying machine with selective illuminations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737748A (en) * 1984-07-20 1988-04-12 Minolta Camera Kabushiki Kaisha Copying machine with selective illuminations

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