Photocopying – Contact printing – Light boxes
Patent
1991-04-08
1992-09-29
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355274, G03G 1516, G03G 1500
Patent
active
051517361
ABSTRACT:
An image forming apparatus includes an image bearing member carrying an image corresponding to image information; an image transfer device for transferring the image on the image bearing member onto a transfer material at a transfer position, wherein the transfer device includes a charging member contactable to a back side of the transfer material and voltage application means for applying a voltage to the charging member, wherein the voltage applying device effects a constant voltage control to the charging member when an image region of the image bearing member is at the transfer position, and effects a constant current control to the charging member at least a part of the other duration, and wherein a voltage level of the constant voltage control is determined on the basis of a voltage across the transfer device during the constant current control; wherein voltage applied to the charging member by the voltage applying device or a current through the charging member by the voltage applying device is limited.
REFERENCES:
patent: 3837741 (1974-09-01), Spencer
patent: 3924943 (1975-12-01), Fletcher
patent: 4360262 (1982-11-01), Genthe
Araya Junji
Ishiyama Tatsunori
Nakahata Kimio
Ohzeki Yukihiro
Sato Yasushi
Canon Kabushiki Kaisha
Pendegrass Joan H.
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