Bias voltage controlled developing system in an electrophotograp

Details Bias voltage controlled developing system in an electrophotograp Bias voltage controlled developing system in an electrophotograp

1979-10-29

1982-02-09

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118647, 355 3DD, G03G 1500

Patent

active

043147550

ABSTRACT:
An electrophotographic copying machine is disclosed comprising an image formation section for forming an electrostatic latent image on a photosensitive drum, and a magnet brush developing unit for developing the electrostatic latent image through the use of toner. A bias voltage is applied between the photosensitive drum and the magnet brush developing unit. A humidity sensor is disposed in the electrophotographic copying machine to develop an output signal indicative of the humidity in the electrophotographic copying machine. A bias voltage control circuit is associated with the humidity sensor for selectively determining the bias voltage at a higher value when the humidity exceeds a preselected threshold value. When the humidity is below the preselected threshold value, the bias voltage is held at a lower value.

REFERENCES:
patent: T956001 (1977-03-01), Kasper et al.
patent: 2902974 (1959-09-01), Greaves
patent: 3814516 (1974-06-01), Whited
patent: 3816756 (1974-06-01), Bresnick

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