Hybrid scavengeless development using a method for preventing a

Details Hybrid scavengeless development using a method for preventing a Hybrid scavengeless development using a method for preventing a

1998-09-28

1999-07-13

Smith, Matthew S.

Electrophotography

Image formation

Development

399291, G03G 1508

Patent

active

059239328

ABSTRACT:
A method and apparatus for preventing ghosting defect, which appears as a lightened ghost image of a previously developed image in a halftone or solid. The defect is due to the different characteristics of the toner that has been reloaded into the recently detoned areas of the donor roll from that toner which has remained on the donor and passed through the reload nip a number of times. A developer unit for developing a latent image recorded on an image receiving member with marking particles, to form a developed image, comprising: means for moving the surface of the image receiving member at a predetermined process speed. A donor member is spaced from the image receiving member and adapted to transport marking particles to a development zone adjacent the image receiving member. A housing is provided defining a chamber storing a supply of developer material comprising toner. The donor member is biased to a first predefined potential. A magnetic brush loads a toner layer onto a region of said donor member; and a charging device charges said toner layer loaded on the region of said donor member to a second predefine potential and wherein said first potential substantially equal said second potential.

REFERENCES:
patent: 4868600 (1989-09-01), Hays et al.
patent: 5128723 (1992-07-01), Bolte et al.

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