Bias voltage switching circuit for controlling concentration of

Details Bias voltage switching circuit for controlling concentration of Bias voltage switching circuit for controlling concentration of

1979-01-05

1980-07-22

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118651, 118679, G03G 1500

Patent

active

042136920

ABSTRACT:
A bias voltage switching circuit for an electrophotographic copying apparatus includes a series-connected string of resistors,, a constant bias voltage source in parallel with the string of resistors and a plurality of switching transistors. Each of the transistors is connected between a different junction of the series connected resistors and a common reference potential to which the constant voltage source and one end of the string of resistors is connected. Selective operation of the transistors varies the voltage output of the bias voltage switching circuit for use in controlling the concentration of the image produced by the copying apparatus.

REFERENCES:
patent: 3654893 (1972-04-01), Piper et al.
patent: 3805739 (1974-04-01), Feldeisen et al.
patent: 3981267 (1976-09-01), Gardiner et al.
patent: 4003650 (1977-01-01), Courtney et al.

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