Developing roller and developing apparatus

Details Developing roller and developing apparatus Developing roller and developing apparatus

1998-06-29

2000-05-23

Braun, Fred L.

Electrophotography

Image formation

Development

492 56, G03G 1508

Patent

active

060674342

ABSTRACT:
A developing roller supports a one-component developer on a surface thereof in the form of a thin layer, and is brought in contact with or in proximity to an image forming body in such a state, to supply the developer on a surface of the image forming body, thereby allowing a visible image to be formed on the surface of the image forming body. The developing roller includes: an elastic layer having an ionically conductivity whose surface is imparted with a resin component having a high resistivity. Thus, if R1 is a resistance of the roller in a stationary state and R2 is a resistance of the roller in a rotational state, a relationship of R1>R2 is established. With this developing roller, it is possible to obtain a high quality image and a high gradient.

REFERENCES:
patent: 4958193 (1990-09-01), Nojima et al.
patent: 4990963 (1991-02-01), Yamamoto et al.
patent: 5286917 (1994-02-01), Unno et al.
patent: 5557060 (1996-09-01), Okada et al.
patent: 5697027 (1997-12-01), Takagi et al.
patent: 5903808 (1999-05-01), Takizawa et al.

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