Electrostatic recorder with a recording head which floats on a f

Details Electrostatic recorder with a recording head which floats on a f Electrostatic recorder with a recording head which floats on a f

1975-02-27

1978-11-07

Lucas, Jay P.

Recorders

Electric recording

Electrochemical

346139C, G03G 15044

Patent

active

041248546

ABSTRACT:
In a method and apparatus for electrostatically recording on a dielectric coated sheet, a recording head carrying a stylus array is spaced apart from the sheet to form an ionization gap. A charge image is transferred to the sheet by applying an activating voltage between selected styli and a back-up electrode. All styli receive a D.C. bias voltage and selected styli additionally receive "write" pulse voltage. The sum of the bias and write pulse voltages exceeds the threshold breakdown voltage of the gap to ionize the air in the gap under the selected styli. The charge image, created by the ionized air, is subsequently toned to form a visible image. The magnitude of the threshold breakdown voltage is dependent on the length of the gap and the required magnitude of the write pulses depends in part on how accurately the length of the gap is maintained constant. In order to accurately establish gap length and thereby minimize the required magnitude of the "write" pulses, an air cushion between the recording head and sheet is established by fluid jets of air emanating from apertures along the bottom of the recording head. The gap length is controlled by adjusting the air pressure forming the air jets. By adding moisture to the air, the humidity of the ionization gap is also controlled.

REFERENCES:
patent: 2919171 (1959-12-01), Epstein
patent: 2932690 (1960-04-01), Adams
patent: 2959636 (1960-11-01), Lemelson
patent: 3023070 (1962-02-01), Benn
patent: 3076968 (1963-02-01), Schwertz
patent: 3213461 (1965-10-01), Goddard
patent: 3249701 (1960-05-01), Silver
patent: 3631509 (1971-12-01), Marshall

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