Method and arrangement for eliminating undesired density variati

Details Method and arrangement for eliminating undesired density variati Method and arrangement for eliminating undesired density variati

1975-09-22

1977-06-14

Lucas, Jay P.

Recorders

Electric recording

Electrochemical

346154, G03G 15044

Patent

active

040301060

ABSTRACT:
An electric charge is created on a moving reproduction carrier by each of a plurality of electrodes extending in a line perpendicular to the direction of transport of the reproduction carrier. Each of the signals applied to the electrodes has an amplitude corresponding to the density of the corresponding point of the original. The charge created by the electrode has undesirable variations resulting from differences in the electrode characteristics and from differences in the amplifiers amplifying the signal before application to each electrode. After each charge distribution from a copy has been created, a test signal is supplied to the inputs of all amplifiers. This creates a test charge distribution on the reproduction carrier. After developing of the reproduction carrier the test line created by developing of the test charge distribution is scanned photoelectrically. A differential amplifier compares each of the so-scanned signals with a reference signal and furnishes an error signal as a function of the difference therebetween. The error signal is utilized to vary the gain of the amplifier associated with the electrode.

REFERENCES:
patent: 2868642 (1959-01-01), Hayford
patent: 2922106 (1960-01-01), Oates
patent: 3217111 (1965-11-01), Namenyi-Katz
patent: 3480963 (1969-11-01), Stowell
patent: 3598910 (1971-08-01), Johnston
patent: 3792495 (1974-02-01), Bliss et al.

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