Title: Formation of electrostatic charge patterns

Abstract: A method of recording an electrostatic charge image or pattern representing information to be recorded, such discharge pattern being generated in the interior of an envelope or chamber comprising as a portion of its wall a dielectric target towards which the charges are projected, characterised in that a corresponding electrostatic charge image is produced externally of the envelope on the exterior surface of the dielectric target by projecting such charges against the target while the exterior surface of the target is electrostatically charged with charges of a polarity opposite to the interior charge pattern or is being exposed to such opposite charging from an external charging source. Optionally, a separate dielectric material is arranged outside the chamber in contact with the exterior target surface and the external charge pattern is produced on the separate dielectric material which can be removed.

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Inventors: Verhille, Karel Eugeen (Hoboken, BE)

Application Number: 420561
Filing Date: 1973-11-30
Publication_date: 1976-01-13
Assignee: AGFA-GEVAERT N.V. (Mortsel, BE)
Primary Class(es): 378/28 250/324, 347/121, 430/55
Other Classes:
US Patent Ref:

2965481	Dec, 1960	Gundlach	250/325.
3001849	Sep, 1961	Walkup	250/315.
3041611	Jun, 1962	Moss	346/74.
3508477	Apr, 1970	Groo	250/315.
3576583	Apr, 1971	Uno	346/74.
3757351	Sep, 1973	Simms	346/74.
3774029	Nov, 1973	Muntz et al.	250/315.

Other Refs:
Primary Examiner: Lawrence, James W.
Assistant Examiner: Anderson, B. C.
Attorney: Daniel; William J.