JPS56143467A - Copying apparatus - Google Patents

Copying apparatus

Info

Publication number
JPS56143467A
JPS56143467A JP4709780A JP4709780A JPS56143467A JP S56143467 A JPS56143467 A JP S56143467A JP 4709780 A JP4709780 A JP 4709780A JP 4709780 A JP4709780 A JP 4709780A JP S56143467 A JPS56143467 A JP S56143467A
Authority
JP
Japan
Prior art keywords
copying
original
images
polarity
developing
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
JP4709780A
Other languages
Japanese (ja)
Other versions
JPH0321915B2 (en
Inventor
Mitsuo Nakamura
Kazuo Kashiwagi
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 JP55047097A priority Critical patent/JPH0321915B2/ja
Publication of JPS56143467A publication Critical patent/JPS56143467A/en
Publication of JPH0321915B2 publication Critical patent/JPH0321915B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/04Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material

Abstract

PURPOSE:To prevent the toner from sticking around the copy and to prevent malfunction by providing a copying means which makes the copies having always positive images by selectively projecting an original having negative images and an original having positive images to a photoreceptor. CONSTITUTION:The copying apparatus is so constituted that at the time of feeding photosensitive paper S to a copying part 15 a charger 17 is changed over of its charging characteristics depending upon the kinds of the originals to be copied. Namely, the charger 17 is so arranged as to charge the photosensitive paper to the polarity differring from the polarity of the developing toner of a developing device 19 when copying the reflected original having positive images and to charge the photosensitive paper to the same polarity as the polarity of the developing toner of the developing device 19 when copying a microfilm original having negative images. As a result, the sticking of the toner around the copy having the positive images does not occur despite the use of the original of either positive or negative images, and the possibility for mistaking the copying work is eliminated.
JP55047097A 1980-04-10 1980-04-10 Expired - Lifetime JPH0321915B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55047097A JPH0321915B2 (en) 1980-04-10 1980-04-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55047097A JPH0321915B2 (en) 1980-04-10 1980-04-10

Publications (2)

Publication Number Publication Date
JPS56143467A true JPS56143467A (en) 1981-11-09
JPH0321915B2 JPH0321915B2 (en) 1991-03-25

Family

ID=12765674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55047097A Expired - Lifetime JPH0321915B2 (en) 1980-04-10 1980-04-10

Country Status (1)

Country Link
JP (1) JPH0321915B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142572A (en) * 1983-02-02 1984-08-15 Canon Inc Image forming device
JPS62249135A (en) * 1986-04-22 1987-10-30 Canon Inc Negative and positive recognizing method for microfilm
US4708464A (en) * 1985-01-30 1987-11-24 Minolta Camera Kabushiki Kaisha Device for erasing unnecessary images for use in reader-printers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4937539A (en) * 1972-08-09 1974-04-08

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4937539A (en) * 1972-08-09 1974-04-08

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142572A (en) * 1983-02-02 1984-08-15 Canon Inc Image forming device
JPH0557588B2 (en) * 1983-02-02 1993-08-24 Canon Kk
US4708464A (en) * 1985-01-30 1987-11-24 Minolta Camera Kabushiki Kaisha Device for erasing unnecessary images for use in reader-printers
JPS62249135A (en) * 1986-04-22 1987-10-30 Canon Inc Negative and positive recognizing method for microfilm

Also Published As

Publication number Publication date
JPH0321915B2 (en) 1991-03-25

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