Image-forming apparatus with potential applied to layer thicknes

Details Image-forming apparatus with potential applied to layer thicknes Image-forming apparatus with potential applied to layer thicknes

1999-01-20

1999-12-21

Grimley, Arthur T.

Electrophotography

Image formation

Development

399274, G03G 1508

Patent

active

060060603

ABSTRACT:
An image-forming apparatus is provided that can form good images stably by uniformly and stably charging a non-magnetic single-component developer (such as a toner). In this apparatus, a DC power supply applies a positive voltage Vd to a development roller, and a DC power supply applies a positive voltage Vb to a layer thickness restricting blade. The voltages Vb and Vd satisfy the relationship Vb>Vd+Vt, where Vt is the potential difference in a thickness direction of the layer of toner T adhering to the development roller. The toner T is a suspension polymer toner excelling in fluidity. Accordingly, toner T charged with reverse polarity can be nicely removed. In addition, the action of injecting electric charge to the toner T by the application of the potential Vb to the layer thickness restricting blade 32 is not produced and, even without that action, the toner T can be sufficiently charged by friction-charging produced by the development roller and the supply roller working together. Thus the toner T can be uniformly and stably charged.

REFERENCES:
patent: 4640880 (1987-02-01), Kawanishi et al.
patent: 4663262 (1987-05-01), Oka et al.
patent: 5506084 (1996-04-01), Ohta et al.
patent: 5608501 (1997-03-01), Makino
patent: 5708940 (1998-01-01), Hosaka et al.
patent: 5771427 (1998-06-01), Makino
patent: 5887233 (1999-03-01), Abe et al.

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