Developing device having toner carrying body and method of fabri

Details Developing device having toner carrying body and method of fabri Developing device having toner carrying body and method of fabri

1991-07-19

1993-01-05

Pendegrass, Joan H.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

2989532, 355259, G03G 1508

Patent

active

051773228

ABSTRACT:
The invention is applied to a developing device having a cylindrical toner carrying body. The cylindrical toner carrying body includes a cylindrical electrically conductive inner layer and a cylindrical semiconductor outer layer. The surface potential at the semiconductive outer layer is controlled by power supplies connected to the electrically conductive inner layer, so that particles of a single-component toner charged by friction can adhere to the semiconductive outer layer surface. In such a developing device having the thus constructed toner carrying body, the electrically conductive inner layer is formed of a cylindrical sleeve made of an electrically conductive metallic material, and the semiconductive outer layer not only is formed of a semiconductive resin layer coated on the outer peripheral surface of the cylindrical sleeve but also has uniform irregularities on its surface.

REFERENCES:
patent: 3754963 (1973-08-01), Chang
patent: 4522907 (1985-06-01), Mitsuhashi et al.
patent: 4564285 (1986-01-01), Yasuda et al.
patent: 4989044 (1991-01-01), Nishimura et al.
patent: 4990963 (1991-02-01), Yamamoto et al.

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