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Title:
ELECTROPHOTOGRAPHIC DEVICE PROVIDING REVERSAL DEVELOPMENT
Document Type and Number:
Japanese Patent JPS6313080
Kind Code:
A
Abstract:

PURPOSE: To prevent a developer from sticking on a no-image area by providing a 1st control means which is switched between an image area and the no-image area when a developing means is provided with a bias voltage applying means, and a 2nd control means which controls an exposing means.

CONSTITUTION: A sleeve 411 which constitutes a developing device 41 and a doctor blade 412 made of a magnetic material can be applied with an AC voltage 45 and a DC voltage 46 over lapped with each other through the switching of a switch S1. Thus, the bias voltage applying means is constituted to apply the DC voltage 46 to the image area by connecting the switch S1 to the side of a contact point (d) or to the no-image area by connecting the switch to the side of a contact point (e). Further, when toner is stuck on a dark part potential part of a photosensitive body, a switch S2 connected to the side of the content (e) is connected to the side of a contact point (f) to apply a DC voltage 47 and when the toner is stuck on a light part potential part, the switch is switched to the side of a contact point (g) to apply a DC voltage 48. Those control operations are performed by a control means 52 and the voltages 46W48 are adjusted to desired values.


Inventors:
TANAKA KAZUMOTO
HANADA SHINJI
ISHIHARA NORIYUKI
Application Number:
JP15701286A
Publication Date:
January 20, 1988
Filing Date:
July 03, 1986
Export Citation:
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Assignee:
CANON KK
International Classes:
G03G15/08; (IPC1-7): G03G15/08
Domestic Patent References:
JPS54115233A1979-09-07
JPS5545059A1980-03-29
JPS60200264A1985-10-09
JPS61277977A1986-12-08