Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1979-03-07
1980-12-02
Moses, R. L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 14CH, 355 67, 430 35, G03G 1500
Patent
active
042368120
ABSTRACT:
A system for impressing images on electrophotographic film provides for the charging of each film frame rapidly to a peak voltage determined by the prevailing light conditions of the image to be produced or recorded. After charging the film frame is immediately exposed to an image. In the preferred method, the time of exposure is predetermined and fixed. Next, toner is applied immediately to the charged frame in the presence of a bias field which propels the toner particles toward the film. Thereafter excess toner is removed or leaves the film 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 transfers the toned image to an acceptor member where it is fixed.
The various processing steps are all carried out at points on the dark decay portion of the characteristic discharge curve for the particular film so that the resultant image has high resolution and optimum contrast. The sensitivity of the film is controlled by the level to which it is charged initially, and the level in turn is chosen on the basis of the average light of the image to be recorded.
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Coulter Systems Corporation
Moses R. L.
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