Browse Prior Art Database

Independent Biasing within Development Zone

IP.com Disclosure Number: IPCOM000052047D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Witcher, LD: AUTHOR

Abstract

A magnetic brush developer is described having a plurality of magnetic brush devices each biased with a predetermined bias voltage.

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Independent Biasing within Development Zone

A magnetic brush developer is described having a plurality of magnetic brush devices each biased with a predetermined bias voltage.

The magnetic brush developer 10 comprises a plurality of magnetic brushes 12 each provided with electrically isolated mounting adjacent to a photoconductor 14 having a latent image to be developed. A power source 16 is provided to impress a preselected voltage on each of the magnetic brushes 12 by connection to a terminal 18 which extends outside developer housing 20.

By proper selection of the voltage levels, different development characteristics are provided at each of the magnetic brushes 12 in developer 10. For example, the entry zone brush 22 is set at the opposite potential to the image potential to a level to enhance image development to remove previous image toner, or at a level of image enhancement as not to remove high amounts of toner from carrier material, therefore overcharging the carrier component.

The next zones into the developer on brush 24 could be set to higher image potentials (closer to max image delta), allowing the charged carrier to mix into toned developer max between zones.

Additional potentials for each zone of developer on brushes 26, 28 would further improve the image without overcharging the carrier component to the point that it would pull toner from the image area before exiting the development zone, or being carried out of the developer due to high charge....