Photocopying – Contact printing – Light boxes
Patent
1991-07-17
1993-10-05
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355246, 355221, G03G 1514
Patent
active
052509958
ABSTRACT:
Electrophotographic developing apparatus including a carrier of latent image formed on a photoconductive layer superposed to a conductive layer, a carrier of developing material juxtaposed to the latent image carrier at a developing zone for transferring the developing material on the photoconductive layer in a configuration corresponding to the latent image and a transfer station in which a printing support is brought in contact with the photoconductive layer for transferring the developing material from the photoconductive layer to the printing support, the distribution of the developing material on the photoconductive layer being enhanced by subjecting the photoconductive layer, in a zone extending between the developing zone and the transfer station, to an alternating electrical field which enables migration of developing material particles from the outside of the latent image to the inside of the latent image.
REFERENCES:
patent: 4039257 (1977-08-01), Connolly
patent: 4348098 (1982-09-01), Koizumi
patent: 4984022 (1991-06-01), Matsushita et al.
Koehler et al, "Field Enhancement of Pretransfer Discharge", May 1976, p. 13, vol. 1, No. 5.
Bull HN Information Systems Italia S.p.A.
Grimley A. T.
Lee Shuk Y.
Phillips James H.
Solakian John S.
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