Developing device having an AC current with two frequencies and

Details Developing device having an AC current with two frequencies and Developing device having an AC current with two frequencies and

1998-07-15

1999-12-07

Braun, Fred L.

Electrophotography

Image formation

Development

G03G 1508, G03G 1509

Patent

active

059997826

ABSTRACT:
A developing device capable of producing images having excellent image density and texture without density irregularities, which includes a developer carrier disposed opposite the image carrier and transporting a developer hell on its surface to a developing region and a voltage supplying unit which applies an alternating current voltage to the developer carrier, the alternating current voltage having a first frequency during a first action period and a second frequency during a second action period, the first action period and the second action period being alternately repeated, the second frequency being higher than the first frequency.

REFERENCES:
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patent: 4688923 (1987-08-01), Kohyama
patent: 5307127 (1994-04-01), Kobayashi et al.
patent: 5424812 (1995-06-01), Kemmochi et al.
patent: 5532801 (1996-07-01), Mizoguchi
patent: 5534982 (1996-07-01), Sakaizawa et al.
patent: 5554479 (1996-09-01), Ochiai et al.
patent: 5565966 (1996-10-01), Ochiai et al.
patent: 5602630 (1997-02-01), Endo et al.

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