Bias voltage source for applying a bias voltage on a magnetic br

Details Bias voltage source for applying a bias voltage on a magnetic br Bias voltage source for applying a bias voltage on a magnetic br

1978-03-01

1980-03-11

Pellinen, A. D.

Photocopying

Including fiber optics

361235, G03G 2100

Patent

active

041926048

ABSTRACT:
This invention provides a bias voltage source for an electrostatic printing apparatus, which controls the movement of toner powder by a potential difference between a photosensitive layer on a cylindrical drum and a magnetic brush. The bias voltage source is provided with a charge storage circuit formed of a resistor connected between the output terminal of said bias voltage source and rectification circuit, and capacitor. When power is turned off, electric energy stored in the capacitor is slowly discharged through the resistor of the charge storage circuit so that the output voltage of the bias voltage source attenuates slowly, thereby preventing toner powder from being attracted to the photosensitive layer.

REFERENCES:
patent: 2880699 (1959-04-01), Hayford
patent: 3654893 (1972-04-01), Piper et al.
patent: 4113374 (1978-09-01), Nakamura et al.
Trachtenberg et al., "Induction Plate Bias Control for Electrophotographic Development", Report 13335, Kodak Research Disclosure, May 1975.

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