Photocopying – Contact printing – Light boxes
Patent
1991-11-08
1992-07-21
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355219, 355271, 355296, G03G 1516
Patent
active
051327384
ABSTRACT:
An image forming apparatus includes a movable image bearing member, a charger for electrically charging the image bearing member, latent image forming device for forming a latent image with use of the charger, a developing device for developing the latent image formed by the latent image forming device with toner electrically charged to a polarity the same as a polarity to which the image bearing member is charged by the charger, image transfer member contactable to a back side of a transfer material to transfer a toner image provided by the developing device from the image bearing member to the transfer material, a voltage application device for applying a voltage to the transfer member, the voltage application device applying a voltage having a polarity the same as that of the toner to the transfer member during non-transferring operation, and a device for providing different potentials for a portion of the image bearing member to be opposed to the image transfer device during the non-transfer action by said image transfer member and for a portion of said image bearing member to be opposed to said image transfer member during transfer action by the image transfer member.
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IBM Technical Disclosure Bulletin, vol. 24, No. 1 B Jun. 1981 "Switch Regulation of High Voltage Corona Supplies".
Araya Junji
Kisu Hiroki
Miyamoto Toshio
Nakamura Shunji
Saito Masanobu
Canon Kabushiki Kaisha
Pendegrass Joan H.
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