Image forming apparatus having transfer constant current source

Details Image forming apparatus having transfer constant current source Image forming apparatus having transfer constant current source

1995-09-15

1997-01-21

Beatty, Robert

Electrophotography

Control of electrophotography process

Responsive to copy media characteristic

399159, 399318, G03G 2100

Patent

active

055963919

ABSTRACT:
An image forming apparatus, including a laminate image-bearing member having a dielectric layer or photoconductive layer, superimposed on an electrically conductive substrate, a transfer member for making pressure contact with said image-bearing member, and a cleaning member for cleaning the surface of said image-bearing member through contact therewith, forms an electrostatic latent image on said image-bearing member, develops said latent image into a visible toner image, and transfers said toner image from said image-bearing member to a transfer sheet passing through a contact-pressure nip portion between said image-bearing member and a transfer member by applying a controlled constant-current regulated transfer bias voltage to said transfer member. Where the transfer member is narrower than the dielectric layer, or photoconductive layer, of the image-bearing member and the width of the cleaning member so as to be arranged within said widths, a controller changes the transfer current of constant-current regulated transfer bias in accordance with the thickness of the dielectric layer or photoconductive layer of the image-bearing member.

REFERENCES:
patent: 3910697 (1975-10-01), Lanker
patent: 4132548 (1979-01-01), Nagai et al.
patent: 5485248 (1996-01-01), Yano et al.

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