Method and apparatus for making transparencies electrostatically

Details Method and apparatus for making transparencies electrostatically Method and apparatus for making transparencies electrostatically

1981-11-02

1983-12-06

Prescott, A. C.

Photocopying

Including fiber optics

355 3P, 355 14TR, 118 56, 118641, 430126, 430130, 430136, G03G 1500

Patent

active

044190042

ABSTRACT:
An electrostatic method of making transparencies and apparatus for practicing said method. An endless electrophotographic belt is charged, imaged and toned with a liquid toner suspension. The belt with the toned image is brought into close proximity to a precisely dimensioned gap defined by a heated roller over which is passed a strip of transfer material comprising a transparent substrate carrying a thin ohmic layer bonded thereto and a thin overcoat of resinous material on the ohmic layer and bonded thereto. An electrical bias is applied across the gap between the belt and the overcoated ohmic layer. The toner particles migrate electrophoretically toward the overcoated substrate. Heat is applied sufficient to melt the overcoating just prior or during the application of the electrical bias so that transfer occurs due to electrophoretic migration through the melt, thus embedding the transferred toner particles of the toner image within the resin. The transfer material is quickly cooled. The resulting transparency comprises the coated transparent member having the tone image embedded in the resin coating below the surface thereof.

REFERENCES:
patent: 3741760 (1973-06-01), Snelling
patent: 3893761 (1975-07-01), Buchan et al.
patent: 4055418 (1977-10-01), Buckley et al.
patent: 4073583 (1978-02-01), Teumer et al.
patent: 4320186 (1982-03-01), Kato et al.

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