Developing device for an image forming apparatus having a large

Photocopying – Contact printing – Light boxes

Patent

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Details

118651, 118653, 118656, 355259, G03G 2100

Patent

active

052203832

ABSTRACT:
A developing device incorporated in an image forming apparatus and including a developing roller or similar developer carrier for transporting a developer to a developing region where it faces an image carrier, so as to develop a latent image electrostatically formed on the image carrier. The developer carrier has a first and a second substance different in charging characteristic from each other and exposed to the outside on the surface of the developer carrier in a regular or irregular pattern. At least one of the first and second substances is charged to predetermined polarity on the surface of the developer carrier to form a great number of microfields. Alternatively, the developer carrier may have a conductive base and a surface layer provided on the base and constituted by a conductive substance in which insulating particles are dispersed. At least the insulating particles are charged on the surface of the developer carrier to form a number of microfields. The movement of the developer is controlled by an electric field determined by a relation of a potential deposited on the image carrier, an electric field ascribable to the bias applied from a bias applying source, and an electric field developed on the developer carrier.

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patent: 3999515 (1976-12-01), Weiler
patent: 4114261 (1978-09-01), Weiler
patent: 4295443 (1981-10-01), Kohyama
patent: 4425382 (1984-01-01), Tajima
patent: 4515106 (1985-05-01), Kohyama
patent: 4930438 (1990-06-01), Demizu et al.

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