JPS54133138A - Electrophotographic device - Google Patents

Electrophotographic device

Info

Publication number
JPS54133138A
JPS54133138A JP4005478A JP4005478A JPS54133138A JP S54133138 A JPS54133138 A JP S54133138A JP 4005478 A JP4005478 A JP 4005478A JP 4005478 A JP4005478 A JP 4005478A JP S54133138 A JPS54133138 A JP S54133138A
Authority
JP
Japan
Prior art keywords
photoreceptor
original
image
shutter
exposure
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
JP4005478A
Other languages
Japanese (ja)
Inventor
Katsuhiko Yamada
Teruo Morikawa
Kenji Okawara
Yusaku Takada
Atsushi Kubota
Haruo Kadoi
Nobukazu Sasaki
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 JP4005478A priority Critical patent/JPS54133138A/en
Publication of JPS54133138A publication Critical patent/JPS54133138A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To realize erasing of charging in a particular region, by opening the shutter when not exposing the original on the photoreceptor, and radiating the outside region of the image forming region of the photoreceptor at the time of blank exposure and when projecting optical image for electrostatic latent image forming. CONSTITUTION:In the image exposure process of an original platen 5, since a shutter 16 is disposed in the solid line position as shown in the drawing, the light from a lamp 6 passing through a slit 7b in a reflector shade 7 is shielded for the photoreceptor la, so that only the image from the original face may be exposed. At the time of blank exposure, namely, when the image formation scanning means returns, the shutter 16 retreats to the position shown by dotted-line position, and the light passing through slits 3b, 7b radiates the entire width of the photoreceptor at the original image exposure part, so that the potential at the photoreceptor 1a may be the same as when the original having the entirely white surface is projected. As a result, the electric charge disappears, and the developer does not deposit on both bright and dark parts. Therefore, it is possible to prevent increase of the load of cleaning device, contamination of separation pawl with developer, and similar inconveniences.
JP4005478A 1978-04-05 1978-04-05 Electrophotographic device Pending JPS54133138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4005478A JPS54133138A (en) 1978-04-05 1978-04-05 Electrophotographic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4005478A JPS54133138A (en) 1978-04-05 1978-04-05 Electrophotographic device

Publications (1)

Publication Number Publication Date
JPS54133138A true JPS54133138A (en) 1979-10-16

Family

ID=12570194

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4005478A Pending JPS54133138A (en) 1978-04-05 1978-04-05 Electrophotographic device

Country Status (1)

Country Link
JP (1) JPS54133138A (en)

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