Developing roller and developing apparatus

Details Developing roller and developing apparatus Developing roller and developing apparatus

1996-09-18

1999-05-11

Grimley, Arthur T.

Electrophotography

Image formation

Development

492 18, 492 56, G03G13/16;15/08

Patent

active

059038080

ABSTRACT:
A developing roller is adapted to carry a developer on its surface and come in contact with or close to a photoconductor drum having an electrostatic latent image borne on its surface whereby the developer is supplied to the drum to visualize the latent image. The developing roller includes a highly conductive shaft and an elastic layer with conductivity formed around the shaft. The elastic layer is surface treated so as to have a resin component which contains a urea resin and/or melamine resin. The roller satisfies log(R.sub.2 /R.sub.1).ltoreq.4.5 wherein the untreated roller has a resistance R.sub.1 and the roller with the resin component has a resistance R.sub.2. The developing roller does not contaminate the photoconductor drum and ensures that images of quality are reproduced without a density variation and background fog over a long time.

REFERENCES:
patent: 5099285 (1992-03-01), Hirano et al.
patent: 5697027 (1997-12-01), Takagi et al.
patent: 5741616 (1998-04-01), Hirano et al.

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