Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Patent
1977-11-16
1980-12-30
Martin, Jr., Roland E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
430 66, 430 55, 355 3R, G03G 504
Patent
active
042424330
ABSTRACT:
Electrophotographic medium which comprises a multilayer structure of materials for imaging radiant energy patterns at high speed and with high sensitivity of a degree capable of meeting and exceeding the sensitivity of silver halide film, with greater resolution than that of silver halide film of the high speed type.
A method of using electrophotographic film to achieve high sensitivities and speeds.
The medium comprises a transparent substrate, ohmic layer and coating of photoconductive material, all of which form a modulating structure for the radiant energy that is adapted to be projected through the substrate; a dielectric layer intimately bonded to the surface of the photoconductive coating and a conductive electrode in intimate contact with the dielectric layer.
The use of the electrophotographic medium does not require initial charging; hence no means for effecting this are required. Further, the speed of the medium is so high compared with all other media that extremely low energy levels can provide sufficient contrast to produce images.
The structure as described is used by connecting a d.c. voltage across the outer electrode and the ohmic layer and projecting the image onto the medium from what would be considered the bottom surface of the substrate. The charge image appears on the dielectric layer. The information represented by the latent change image is utilized by reading the same out with an electron beam or by toning and/or fixing and transfer.
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Nakamura, "PIP And Electrophotography", Denshi Shashin, 4, No. 3, pp. 12-17 (1962).
Hagenlocher Arno K.
Kuehnle Manfred R.
Coulter Systems Corp.
Martin Jr. Roland E.
Silverman I. Irving
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