Photocopying – Including fiber optics
Patent
1973-11-30
1976-02-03
Horan, John M.
Photocopying
Including fiber optics
G03G 1500
Patent
active
039361780
ABSTRACT:
An electrophotographic film member is exposed to an image source, such as a cathode ray tube display unit, and the latent image toned to form a temporary visible image on said film member at a first station. The film member carrying the temporary visible image is stepwise translated to a projection station where it is projected in an enlarged display upon a suitable receptor surface. Thereafter, the film member is stepwise translated to an erase station where the toner is removed and the film member made ready for reuse to receive another image. The first station includes suitable structure for charging the film member, a selectively operable blind or shutter for exposing the charged film member to the image source and an applicator for applying suitable toner from a toner source to the exposed film member. The toner particles adhere tenaceously but removably to the exposed film member without any fixing or fusing process and hence, the toner can be removed from the film member afer projection. During charging and toning, the film member is maintained in darkness.
The electrophotographic film member is mounted in a window formed in a disc arranged for stepwise rotary translation from station to station. The electrophotographic film member 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 3,000 Angstroms and the ohmic layer is about 500 Angstroms. The film is durable with a hard abrasive resistant surface, is highly transparent and has high photoelectric gain. Its speed and sensitivity are such that a projectable transparency is formed almost immediately to enable projection of the received image almost as soon as it is received from the image source. The speed of the stepwise translation preferably is sufficient to provide successive projectable transparencies to the projection station fast enough to fall within the image retention capabilities of the human eye, thereby effecting a cinematographiclike display.
REFERENCES:
patent: 3051044 (1962-08-01), McNaney
patent: 3115075 (1963-12-01), Alexander
patent: 3168857 (1965-02-01), Hutto
patent: 3679301 (1972-07-01), Inoue
patent: 3732007 (1973-05-01), Kushima
patent: 3788739 (1974-01-01), Coriale
Coulter Information Systems, Inc.
Horan John M.
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