Apparatus for producing bias voltage for use in electrophotograp

Details Apparatus for producing bias voltage for use in electrophotograp Apparatus for producing bias voltage for use in electrophotograp

1976-09-27

1978-12-05

Pellinen, A. D.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 68, G03G 1506

Patent

active

041283295

ABSTRACT:
An apparatus for producing a bias voltage for use in an electrophotographic copying machine including a developing electrode, which apparatus assures a bias potential of a proper magnitude in response to a variation in the amount of light emitted by a light source of an exposure optical system. The apparatus comprises a transducer for converting the amount of light into a corresponding electrical quantity, and an amplifier for amplifying the electrical quantity. The apparatus also includes a differential amplifier which produces a bias potential corresponding to the variation in the amount of light to which a reference bias potential is added.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo
patent: 3409901 (1968-11-01), Dost et al.
patent: 3438705 (1969-04-01), King
patent: 3654893 (1972-04-01), Piper et al.
patent: 3815988 (1974-06-01), McVeigh et al.
patent: 3944354 (1976-03-01), Benwood et al.
patent: 3947117 (1976-03-01), Basu et al.
patent: 3981268 (1976-09-01), Tsukamoto et al.

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