Electrophotographic process cartridge

Details Electrophotographic process cartridge Electrophotographic process cartridge

1995-09-08

1997-01-07

Royer, William J.

Electrophotography

Image formation

Development

399149, G03G 1506

Patent

active

055922660

ABSTRACT:
An electrophotographic process cartridge develops an electrostatic latent image with two layers or less of polymeric toner. The electrophotographic process cartridge includes a charging roller for uniformly distributing a layer of electrical charge on an outer surface of a photosensitive drum, a developing roller for transferring particles of polymeric toner each having a substantially spherical shape onto the outer surface of the photosensitive drum, and a control roller for engaging an outer surface of the developing roller to enable formation of two layers or less of polymeric toner particles on the outer surface of the developing roller. The particles of polymeric toner are transferred from the outer surface of the developing roller to the outer surface of the photosensitive drum for a printing operation, and remaining toner particles are transferred from the outer surface of the photosensitive drum back to the outer surface of the developing roller after the printing operation by a bias voltage applied to the developing roller.

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patent: 5260746 (1993-11-01), Yoshida et al.
patent: 5315325 (1994-05-01), Strouth
patent: 5387965 (1995-02-01), Hasegawa et al.
patent: 5422708 (1995-06-01), Morris et al.

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