Developing apparatus and developer carrying member usable therew

Details Developing apparatus and developer carrying member usable therew Developing apparatus and developer carrying member usable therew

1992-11-19

1993-07-13

Gellner, Michael L.

Photocopying

Contact printing

Light boxes

118651, 118658, 355251, G03G 1506

Patent

active

052278492

ABSTRACT:
A developing apparatus for developing an electrostatic latent image includes a developing device, means for supplying a powdery developer, and a developer carrying member for carrying the powdery developer supplied by the developing device to a developing zone where a latent image bearing member passes. The developer carrying member is blast-treated with irregular particles, and subsequently is blast-treated with regular particles having an average particle size larger than that of the irregular particles, wherein a developer carrying surface of the developer carrying member has a mixed first portion provided by the blast-treatment with the irregular particles only, and a second portion provided by the blast-treatment with the irregular particles and subsequent blast-treatment with the regular particles. A blasting energy applied to the developer carrying member, per unit area thereof, is smaller in the blast-treatment with regular particles than in the blast-treatment with irregular particles. The area of the second portion is 30 t 80%, and the remaining area includes the first portion.

REFERENCES:
patent: 4377332 (1983-07-01), Tamura
patent: 4380966 (1983-04-01), Isaka et al.
patent: 4387664 (1983-06-01), Hosono et al.
patent: 4395476 (1989-09-01), Kanbe et al.
patent: 4870461 (1989-09-01), Watanabe et al.
patent: 4982689 (1991-01-01), Honda et al.

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