Image forming apparatus

Details Image forming apparatus Image forming apparatus

1989-08-25

1991-03-26

Moses, R. L.

Photocopying

Contact printing

Light boxes

355251, 355259, 355327, 355328, 118658, 118645, G03G 1501, G03G 1509

Patent

active

050033514

ABSTRACT:
An image forming apparatus includes an image bearing member, a latent image forming device for forming an electrostatic latent image on the image bearing member, a first developing device including a first developer carrying member for carrying a first developer thereon to supply it to the image bearing member, a second developing device including a second developer carrying member for carrying thereon a second developer having a different color from that of the first developer to supply it to the image bearing member, wherein a developer carrying surface of the developer carrying member has a surface property which is different from that of the first developer carrying member, and a bias voltage applying device for applying a first developing bias voltage to the first developer carrying member and for applying to the second developer carrying member a second bias voltage which is different from the first developing bias voltage.

REFERENCES:
patent: 4591261 (1986-05-01), Saruwatari et al.
patent: 4827869 (1989-05-01), Takagi
patent: 4833504 (1989-05-01), Parker et al.

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