Gas separation: apparatus – Magnetic separating means
Patent
1976-07-13
1977-05-24
Martin, Jr., Roland E.
Gas separation: apparatus
Magnetic separating means
252501, 428539, 204192P, 204192S, G03G 504, C23C 1500
Patent
active
040253392
ABSTRACT:
An electrophotographic film which is not only capable of being utilized for the same purposes as conventional xerographic and electrofax members but it also capable of being used in the same manner as silver halide emulsion photographic films, that is, with high speed cameras for universal photographic purposes.
The electrophotographic film comprises a thin film coating of an inorganic, photoconductive, electronically anisotropic material one example of which is a specially sputtered cadmium sulfide bonded to a thin film layer of ohmic material which in turn is bonded to a thin, stable substrate member preferably formed of plastic sheeting. The total thickness of the photoconductive coating is about 3000 Angstroms, of the ohmic layer is about 500 Angstroms and of the substrate member is a fraction of a millimeter.
The product is durable with a hard, abrasive-resistant surface, is highly transparent and flexible notwithstanding the fact that the photoconductive layer is crystalline, and has high photoelectric gain with sufficient speed and sensitivity to be used as mentioned in high speed photography. As such it can accept a charge at a rapid rate and will retain the same selectively after exposure to enable practical toning with an almost infinite gradation of pigment values, i.e., gray scale. The electrophotographic film which is made using the cadmium sulfide as the photoconductive coating has substantially panchromatic response.
The photoconductive coating is novel and can be used in cases where its unusual characteristics provide functions other than required in the electrophotographic film. For example, the coating can be used in many places where it is not important that the entire assembly be transparent. It can be used on metal substrates in making economical circuit elements, for forming photosensitive devices, for making storage elements, in producing recording and transfer media and the like.
Novel methods of manufacture and use of the electrophotographic film and the photoconductive coating are disclosed.
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Kay et al., "Photoconductivity in Sputtered Zinc Oxide Films", IBM Tech. Discl. Bull., vol. 12, No. 6, Nov. 1969, p. 851.
Lagnads et al., Rf-Sputtered Cadmium Sulfide Thin Crystals", Journ. Val. Sci. Tert., vol. 7, No. 2, Mar.-Apr. 1970, pp. 318-321.
Coulter Information Systems, Inc.
Martin Jr. Roland E.
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