Image forming apparatus

Details Image forming apparatus Image forming apparatus

1992-10-08

1994-11-08

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355274, 355327, G03G 1514

Patent

active

053631781

ABSTRACT:
An image forming apparatus, particularly a color image forming apparatus. A conveyer belt made of dielectric material is charged-up electrically by repetitive image transfer actions using corona charging. By the charge-up the transfer current decreases with the result of decrease of image density. In order to compensate with this, the average charge amount of the toner particles transferred to the image receiving material at later stage or stages of the repetitive image transfer actions is decreased with respect to the average charge amount of the toner particles transferred onto the image receiving material in the initial stage or stages of the repetitive image transfer actions. By doing so, the toner image densities in the respective colors are made uniform, so that sharp images can be produced.

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patent: 4788574 (1988-11-01), Matsumoto et al.
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patent: 4931839 (1990-06-01), Tompkins et al.
patent: 4987454 (1991-01-01), Natsuhara

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