Self-biased scorotron and control therefor

Details Self-biased scorotron and control therefor Self-biased scorotron and control therefor

1984-12-21

1987-01-20

Hix, L. T.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

361230, 361235, 250325, 250326, H01T 1904

Patent

active

046383972

ABSTRACT:
A scorotron and control therefor for charging and/or discharging a charge retentive surface such as a photoreceptor of the type utilized in the process of xerographic printing. The control connects the wire grid of the scorotron to ground via a plurality of zener diodes and a variable resistor. The voltage across the variable resistor is low compared to the total circuit voltage so that variations in the grid current result in small variations in grid voltage. The control provides for compensation for out of tolerance zener diodes as well as for photoreceptor aging manufacturing tolerances and temperature elevation. When the variable resistor is a light dependent resistor a light emitting diode contained in a bridge network also containing a thermistor provides for automatic compensation due to elevation in photoreceptor temperature when such temperature is sensed by the thermistor.

REFERENCES:
patent: 2777957 (1957-01-01), Walkup
patent: 3248642 (1966-04-01), Rothschild
patent: 3335275 (1967-08-01), King
patent: 3543140 (1970-11-01), Krausser
patent: 3604925 (1971-09-01), Snelling
patent: 3729649 (1973-04-01), La Chappelle et al.
patent: 4140962 (1977-06-01), Quinn
patent: 4233511 (1980-11-01), Harada et al.
patent: 4335420 (1982-06-01), Mitsuo et al.
patent: 4463284 (1984-07-01), Tamura et al.
patent: 4591713 (1986-05-01), Gundlach et al.

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