Charge compensation circuit for an electrostatic writing head

Details Charge compensation circuit for an electrostatic writing head Charge compensation circuit for an electrostatic writing head

1995-11-16

1998-05-05

Berhane, Adolf

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

340652, 399155, G03G 1501, B41J 205

Patent

active

057482179

ABSTRACT:
A power module including an RC circuit is uniquely associated with each of a plurality of electrodes of an electrostatic print head to individually control the rate of charge decay of a voltage disposed thereon. The resistor of the RC circuit is a potentiometer that may be manually adjusted to obtain an optimal decay rate. A paper supply roller and take-up roller accurately position dielectric material, such as a paper web, adjacent to the electrodes of the print head, which is located between the rollers. The electrodes are typically a plurality of wires. The print head moves across the width of paper web to dispose thereon a plurality of charge areas corresponding to a strip of a latent image. Control circuitry synchronizes the movement of the print head and the web to produce a plurality of abutting strips of charge areas, producing a complete latent image. A toner applicator is positioned downstream from the print head to dispose ionized toner particles which adhere to the plurality of charge areas, thereby producing a visible image.

REFERENCES:
patent: 3611419 (1971-10-01), Blumenthal
patent: 3892481 (1975-07-01), Schaefer et al.
patent: 5243383 (1993-09-01), Parisi
patent: 5298943 (1994-03-01), Ide et al.
patent: 5325120 (1994-06-01), Kuehnle
patent: 5335055 (1994-08-01), Bliss

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