Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1995-05-11
1997-02-04
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
399314, G03G 1316
Patent
active
055996450
ABSTRACT:
In an image forming apparatus of the type sequentially forming powder images of different colors on an image carrier, and sequentially transferring them to an acceptor one above the other (primary transfer), an image transfer method is disclosed which prevents transfer dust from being transferred to the acceptor at the time of the primary transfer. During the primary transfer, a bias potential V.sub.1 is applied to one of two conductors located at an upstream side. The potential V.sub.1 has the same polarity as the charged powder carried on the image carrier. A potential V.sub.2 is applied to the other conductor at a downstream side and provided with a polarity opposite to the polarity of the charged powder. Every time the primary transfer is repeated, the potentials V.sub.l and V.sub.2 are respectively sequentially shifted toward the polarity of the powder and toward the polarity opposite to the polarity of the powder.
REFERENCES:
patent: 4014605 (1977-03-01), Fletcher
patent: 5266437 (1993-11-01), Yamane et al.
patent: 5418105 (1995-05-01), Wayman et al.
Deki Tsuyoshi
Iwata Nobuo
Motohashi Takeshi
Tamiya Takahiro
Goodrow John
Ricoh & Company, Ltd.
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