Image forming apparatus for optimizing toner transfer efficiency

Details Image forming apparatus for optimizing toner transfer efficiency Image forming apparatus for optimizing toner transfer efficiency

1997-03-12

1998-06-30

Royer, William J.

Electrophotography

Control of electrophotography process

Control of charging

399 51, 399 55, 399 66, G03G 1502, G03G 15043, G03G 1506

Patent

active

057747628

ABSTRACT:
In an electrophotographic image forming apparatus, the resistance of an transfer material is detected to which a toner image is transferred. The amount of adhered toners of a standard image is detected, and the development bias voltage is controlled according to the detected amount of adhered toners. Then, the transfer voltage is controlled by taking into account the resistance of the transfer material, the charges of adhered toners and the development bias voltage. Thus, the transfer efficiency is stabilized so that a stable image is formed with reproducible colors and densities. For a dot image, an area ratio of a standard dot toner image is detected, and at least one of an amount of charges for charging the photoconductor uniformly, an intensity of the light beam for exposing the photoconductor and the development bias voltage is controlled according to the detected area ratio.

REFERENCES:
patent: 3837741 (1974-09-01), Spencer
patent: 4505572 (1985-03-01), Ashida et al.
patent: 4796065 (1989-01-01), Kanbayashi
patent: 5107302 (1992-04-01), Bisaiji
patent: 5124750 (1992-06-01), Naito
patent: 5291253 (1994-03-01), Kumasaka et al.
patent: 5351107 (1994-09-01), Nakane et al.

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