Image forming apparatus

Details Image forming apparatus Image forming apparatus

1992-03-05

1993-02-16

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118647, 118651, 346157, 355246, 355327, G03G 1501

Patent

active

051875357

ABSTRACT:
An image forming apparatus includes a first developing device having a first developer carrying member for supplying a first color toner in the first developing zone; a first voltage applying device for applying to the first developer carrying member a first oscillating bias voltage which has a first phase of time period t11 for forming a first electric field applying to the first color toner a force away from the first developer carrying member toward the image bearing member and a second phase of time period t21 for forming a second electric field applying to the first color toner a force away from the image bearing member toward the first developer carrying member; a second developing device having a second developer carrying member for supplying a second color toner in the second developing zone; and second voltage applying device intermittently applying to the second developer carrying member a second oscillating bias voltage having a third phase of time period t12 for forming a third electric field applying to the second color toner a force away from the second developer carrying member to the image bearing member and a fourth phase of time period t22 for forming a fourth electric field applying a force to the second color toner away from the image bearing member toward the second developer carrying member, wherein (t11+t21)>(t12+t22), is satisfied.

REFERENCES:
patent: 4383497 (1983-05-01), Tajima
patent: 4679929 (1987-07-01), Haneda et al.
patent: 4873551 (1989-10-01), Tajima et al.
patent: 5030996 (1991-07-01), Tajima et al.

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