Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1975-01-20
1977-02-08
Moses, R. L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 16, 355 71, G03G 1500
Patent
active
040069869
ABSTRACT:
A system for impressing images on electrophotographic film provides apparatus for charging each film frame rapidly to a peak voltage determined by the prevailing light conditions of the image to be produced or recorded. After charging, means are provided for immediately exposing the frame to an image. In the preferred apparatus, means are provided for adjusting the time of exposure to a fixed period which is predetermined. Means are provided for applying toner to the exposed frame immediately after exposure in the presence of a bias field which propels the toner particles toward the film. Thereafter excess toner is removed from the film or leaves the frame and the remaining toner is fused to the surface of the film to form a permanent visible image on the film frame. An alternate form of the invention provides means for transferring the toned image to an acceptor member where it is fixed.
The apparatus includes structure which enables the processes above described to be carried out along a line or in a rotary arrangement. Electronic and electrical circuitry are provided for accomplishing the various functions in proper sequence and timing.
The apparatus is arranged to carry out the processes at points on the dark decay portion of the characteristic discharge curve for the particular film so that the resultant image has high resolution, optimum contrast and a substantially continuous gray scale. The quality is as good as if not better than photographic quality. The sensitivity of the film is controlled by the level to which it is charged and circuitry provided enables this to be automatically accomplished. The level in turn is chosen on the basis of the average light of the image or scene to be recorded and means are provided to accomplish this automatically or manually.
REFERENCES:
patent: 3062095 (1962-11-01), Rutkus et al.
patent: 3602589 (1971-08-01), Dietz
patent: 3645619 (1972-02-01), Burton et al.
patent: 3746443 (1973-07-01), Hickey
patent: 3790273 (1974-02-01), Tanaka
patent: 3791732 (1974-02-01), Mihalik et al.
patent: 3819261 (1974-06-01), Ogawa
Coulter Information Systems, Inc.
Moses R. L.
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