Photocopying – Contact printing – Light boxes
Patent
1994-01-18
1995-08-01
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355277, G03G 1514
Patent
active
054383994
ABSTRACT:
An image forming apparatus includes a movable image bearing member; an image forming device for forming an image on the image bearing member; a charging member press-contacted to or faced to the image bearing member to transfer the image from the image bearing member onto the transfer material passed therebetween; a bias voltage applying device for applying a bias voltage to the charging member, wherein the voltage applying device constant-voltage-controlled the charging member in a period when an image region of the image bearing member is present in the transfer position, and constant-current-controls the charging member in another period, and wherein a voltage applied to the charging member during the constant voltage control is a sum of a voltage provided during the constant current control and a predetermined voltage.
REFERENCES:
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patent: 4401383 (1983-08-01), Suzuki et al.
patent: 4977430 (1990-12-01), Florack et al.
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patent: 5010370 (1991-04-01), Araya et al.
patent: 5034777 (1991-07-01), Ohzeki et al.
patent: 5144368 (1992-09-01), Ohzeki et al.
patent: 5179397 (1993-01-01), Ohzeki et al.
patent: 5253022 (1993-10-01), Takeuchi et al.
Canon Kabushiki Kaisha
Grimley A. T.
Ramirez Nestor R.
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