Method and apparatus of adjusting of charge level on an electors

Details Method and apparatus of adjusting of charge level on an electors Method and apparatus of adjusting of charge level on an electors

1996-06-11

1998-04-21

Moses, R. L.

Electrophotography

Control of electrophotography process

Control of charging

399 48, G03G 15045

Patent

active

057428689

ABSTRACT:
A method and apparatus of producing images includes a primary charger for depositing a primary electrostatic charge on an electrostatographic recording member. A first electrometer measures or senses the primary electrostatic charge. A light source such as an EL panel is enabled to reduce the level of the primary electrostatic charge to provide a reduced voltage level suited for recording on the image frame. The reduced voltage level on the image frame is imagewise modulated to form an electrostatic image. The electrostatic image is then developed with toner. The output of the EL panel is adjusted in response to a first factor related to a measured value of the level of the primary electrostatic charge and a set point value for the level of the reduced voltage level and a second factor related to error in the level of the reduced voltage level from the set point value for the reduced voltage level. In a specific embodiment of a DAD-CAD process, the primary charge on the image frame is imagewise modulated by a first ROS device and developed with a DAD development station. Thereafter, the image frame with the reduced charge level is imagewise modulated by a second ROS device and developed by a CAD development station.

REFERENCES:
patent: 4105321 (1978-08-01), Urso
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patent: 4355885 (1982-10-01), Nagashima
patent: 4724461 (1988-02-01), Rushing
patent: 4928142 (1990-05-01), Kloosterman
patent: 4939544 (1990-07-01), Cain
patent: 5426487 (1995-06-01), Stelter et al.
patent: 5523831 (1996-06-01), Rushing

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