Image forming apparatus with enhanced pretransfer erasing

Details Image forming apparatus with enhanced pretransfer erasing Image forming apparatus with enhanced pretransfer erasing

1996-08-29

1999-10-12

Braun, Fred L

Electrophotography

Control of electrophotography process

Control of transfer

399318, G03G 1514

Patent

active

059665602

ABSTRACT:
In an electrophotographic copying machine, image quality is improved by suppressing phenomena such as narrowing and thickening of a linear image or discharge noises in a photograph image due to anomalies on transfer of a toner image. For example, a document type is discriminated and when a transfer brush is used for transfer, transfer current and pretransfer erasing are controlled according to the type of document image. The pretransfer erasing is controlled in various following situations: Bi-level exposure method or multi-level exposure method, edge emphasis, photoelectric efficiency, the surface potential of the photoconductor, and position of a developing device.

REFERENCES:
patent: 4536082 (1985-08-01), Motohashi et al.
patent: 5119141 (1992-06-01), Bhagat
patent: 5371579 (1994-12-01), Bisaiji
patent: 5649272 (1997-07-01), Kwon

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