Image reproduction by in plane electro-coagulation of a colloid

Details Image reproduction by in plane electro-coagulation of a colloid Image reproduction by in plane electro-coagulation of a colloid

1984-05-25

1985-11-26

Metz, Andrew H.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204 2, 2041802, 2041816, 204299EC, C25D 1304, C25D 1306, C25D 1312, C25D 1318

Patent

active

045553203

ABSTRACT:
A method and system for high speed image reproduction by electro-coagulation of an electrolytically coagulable colloid. A plurality of negative and positive electrolytically inert electrodes which are electrically insulated from one another are arranged to define a matrix of dot-forming elements, the negative and positive electrodes of each matrix element having planar active surfaces extending in a substantially common plane and in close proximity to one another. A layer of substantially liquid colloidal dispersion is applied over the electrode active surfaces of the matrix elements, the colloidal dispersion containing an electrolytically coagulable colloid, a liquid dispersing medium and a soluble electrolyte, and having a substantially uniform temperature throughout the layer. The negative and positive electrodes of selected ones of the matrix elements are electrically energized to cause selective coagulation and adherence of the colloid onto the positive electrode active surfaces of the selected matrix elements and to thereby form a series of corresponding dots representative of a desired image, and any remaining non-coagulated colloid is thereafter removed.

REFERENCES:
patent: 3752746 (1973-08-01), Castegnier
patent: 3892645 (1975-07-01), Castegnier
patent: 4330788 (1982-05-01), Hinz et al.
Irmischer, D. W., et al., "Print Head for Electrochromic Printing", _IBM Technical Disclosure Bulletin, vol. 22, No. 3, pp. 1256-1257, _(1979).

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