Photocopying – Contact printing – Light boxes
Patent
1992-04-01
1993-06-15
Grimley, A. T.
Photocopying
Contact printing
Light boxes
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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Enoki Shigekazu
Iwata Naoki
Suzuki Koji
Tomita Junko
Ueno Yuichi
Grimley A. T.
Ricoh & Company, Ltd.
Royer William J.
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