Piezoelectric method and medium for producing electrostatic char

Details Piezoelectric method and medium for producing electrostatic char Piezoelectric method and medium for producing electrostatic char

1975-06-18

1978-08-15

Martin, Jr., Roland E.

Gas separation: apparatus

Magnetic separating means

310363, 96 1C, 96 12, 96 1R, 310311, 427100, G03G 1502, G03G 1302

Patent

active

041069331

ABSTRACT:
A radiation sensitive piezoelectric copy method and medium for producing positive or negative latent electrostatic charge patterns. In a first embodiment the copy medium includes a poled, radiation transmissive piezoelectric insulative layer, an electrically conductive layer less compliant than the piezoelectric layer, and a photoconductive layer interposed between and electrically connected with the piezoelectric and electrically conductive layers. A second embodiment is similar to the first embodiment except it does not contain an electrically conductive layer. A third embodiment is similar to the second embodiment except that an electrically conductive layer is juxtaposed with and electrically connected to the piezoelectric layer. Fourth and fifth embodiments are similar to the first embodiment except that the fourth embodiment includes a second layer of poled, piezoelectric material interposed between the photoconductive and electrically conductive layers, and the fifth embodiment includes a plurality of photoconductive layers, each being sensitive to a single, but different, color of light. While the process can be accomplished in various permutations, the basic process involves forming an electrostatic charge on the poled piezoelectric layer by stressing the piezoelectric layer, transferring at least a portion of the charge such that there is both charge and voltage across the photoconductive layer, and selectively exposing the photoconductive layer to appropriate radiation.

REFERENCES:
patent: 2633543 (1953-03-01), Howatt
patent: 2739243 (1956-03-01), Sheldon
patent: 3202824 (1965-08-01), Yando
patent: 3677751 (1972-07-01), Ohta
patent: 3713822 (1973-01-01), Kiess
patent: 3719481 (1973-03-01), Makino
patent: 3775104 (1973-11-01), Matsumoto
patent: 3931446 (1976-01-01), Murayama et al.
Journal of Audio Engineering Society, 1975, p. 72.
Xerography Dassauer & Clark, pp. 230 & 268.

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