Photocopying – Contact printing – Light boxes
Patent
1990-05-15
1993-10-12
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355208, 355219, 355271, 355273, 355215, G03G 1516
Patent
active
052530221
ABSTRACT:
An image forming apparatus includes a movable image bearing member; an image forming device for forming a toner image on the image bearing member; an image transfer device for transferring the toner image onto a transfer material at a transfer position, the transfer device including a rotatable member contactable to such a side of the transfer material as is opposite from a side contactable to the image bearing member and an electric field forming device for forming an electric field between the image bearing member and the rotatable member; wherein the electric field forming device forms a first electric field effective to transfer the toner from the rotatable member to the image bearing member and a second electric field which is opposite in a direction from the first electric field during a period in which the transfer material is absent at the transfer position, wherein each of the first and second electric fields is formed at least for a period required for the entire surface of the rotatable member passes through the transfer position.
REFERENCES:
patent: 4977430 (1990-12-01), Florack et al.
patent: 5132738 (1992-07-01), Nakamura et al.
patent: 5182604 (1993-01-01), Asai
patent: 5196885 (1993-03-01), Takeuchi et al.
Hasegawa Hiroto
Kisu Hiroki
Ohtsuka Yasumasa
Takeuchi Akihiko
Tanigawa Koichi
Canon Kabushiki Kaisha
Grimley A. T.
Smith Matthew S.
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