Photocopying – Contact printing – Light boxes
Patent
1990-04-17
1992-06-30
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355245, 355253, 355326, 430 45, 430 54, G03G 1509
Patent
active
051267950
ABSTRACT:
An image forming method of the present invention comprises: a first toner image formation process for forming a first toner image by forming, on a latent image carrier, a first latent image which corresponds to a first image and developing the first latent image by a first toner charged to one polarity through a development process selected from normal and reverse development process selected from normal and reverse development processes so as to correspond to the polarity of the first toner; a second toner image formation process for forming a second toner image by forming, on the latent image carrier, a second latent image which correspond to a second image and developing the second latent image by a second toner charged to the other polarity by the other development process while applying a developing bias; and a transfer treatment process for simultaneously transferring said first and second toner images to a transfer medium; wherein said developing bias VB2 satisfies the following equations:
REFERENCES:
patent: 4660961 (1987-04-01), Kuramoto et al.
patent: 4831408 (1989-05-01), Yoshikawa et al.
patent: 4833505 (1989-05-01), Furuya et al.
patent: 4882247 (1989-11-01), Maruyama et al.
patent: 4887102 (1989-12-01), Yoshikawa et al.
patent: 4937629 (1990-06-01), Maruyama et al.
Adachi Koji
Furuya Nobumasa
Horie Kiyoshi
Maruyama Kazuo
Noami Tsuneo
Fuji 'Xerox Co., Ltd.
Grimley A. T.
Smith Matthew S.
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