Photocopying – Contact printing – Light boxes
Patent
1990-06-14
1991-07-23
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355275, 355277, G03G 1516
Patent
active
050347772
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 transfer device for transferring an image from the image bearing member to a transfer material at a transfer position, wherein the transfer device is contactable to a backside of the transfer material at the transfer position and includes a charging member including a double oxide and a voltage source for applying a voltage to the charging member, and wherein the voltage source constant-voltage-controls the charging member when an image region of the image bearing member is at the transfer position, and constant-current-controls the charging member in at least a part of a period when the image region of the image bearing member is not at the transfer position, wherein a constant voltage for the constant voltage control is determined on the basis of the constant current control.
REFERENCES:
patent: 3781105 (1973-12-01), Meagher
patent: 3924943 (1975-12-01), Fletcher
patent: 3937572 (1976-02-01), Gaynor et al.
patent: 3954333 (1976-05-01), Goel
patent: 4190348 (1980-02-01), Friday
patent: 4379630 (1983-04-01), Suzuki
Araya Junji
Hiroshima Koichi
Ishiyama Tatsunori
Murata Jun
Nakahata Kimio
Canon Kabushiki Kaisha
Dang Thu
Grimley A. T.
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