Method and apparatus for controlling discharge potentials and timing in a reversal development type image forming apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 29, 1997
Grant Date -
N/A
app pub date -
Jun 27, 1995
filing date -
Jul 21, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An image forming apparatus is capable of preventing carriers and toner particles from migrating from a developing sleeve to a photosensitive drum when the apparatus is stopped. When the image forming operation is stopped, laser beam emission by a laser source initially starts with an output reduced and/or the power supply to the developing sleeve is intermittently cut off. In that portion of the photosensitive drum receiving the reduced output laser beam, the potential charge of the surface is reduced. When the leading part of the laser beam-irradiated surface of the photosensitive drum which has been exposed to the full power laser beam reaches the developing sleeve, a switch circuit for the developing sleeve is permanently turned off. With the photosensitive drum potential lowered in advance and/or the potential of the developing sleeve gradually lowered, the potential difference between the developing sleeve and the photosensitive drum is minimized, regardless of minor timing errors upon deactivation of the sleeve potential.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully