Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Patent
1977-05-20
1981-05-26
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 84, 430 94, 430 87, 430133, 430 66, 430 95, 430 90, 2525011, 427 74, 204192P, G03G 5082, C23C 1500
Patent
active
042699193
ABSTRACT:
A photoconductive coating which comprises a crystalline deposit of a wholly inorganic material, in the preferred form comprising cadmium sulfide, of almost perfect stoichiometry, either with or without small amounts of dopant.
The coating is deposited on a suitable substrate such as a thin, clear, flexible polyester sheet with an intervening layer of ohmic material such as indium-tin oxide in a sputtering method that results in unusual properties. The deposit can be made on metal substrates if desired, but the greater utility is in its application to a transparent substrate so that a transparent electrophotographic member is formed suitable for many uses.
Two important properties worthy of mention are that the coating is such that a charge density may be maintained on its surface (surface charge) which is ten to one hundred times greater than known photoconductive coatings and that there is no photoconductive fatigue.
The photoconductive coating of the invention comprises depositing the coating in a vacuum chamber by sputtering with R.F. energy in such a manner that the deposit is crystalline, with the individual crystals oriented substantially vertically, the size of the crystals being uniform and hexagonal in configuration and of the order of 700 to 800 Angstroms in diameter and with a barrier layer coating on the surface that is of extreme resistivity, each crystal acting independently as an independent field domain, the crystal length normal to the substrate being the same as the coating thickness and the deposit evidencing single crystal configuration in response to diffraction pattern measurements.
REFERENCES:
patent: 2886434 (1959-05-01), Owens
patent: 3397982 (1968-08-01), Lane
patent: 3867143 (1975-02-01), Tanaka et al.
patent: 4025339 (1977-05-01), Kuehnle
Lagnado et al., "RF-Sputtered Cadmium Sulfide Thin Crystals", Jour. Val. Sci. Tert., vol. 7, No. 2, Mar.-Apr. 1970, pp. 318-321.
Coulter Systems Corporation
Martin Jr. Roland E.
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