Electrophotographic image enhancement using luminescent overcoat

Details Electrophotographic image enhancement using luminescent overcoat Electrophotographic image enhancement using luminescent overcoat

1990-01-02

1990-08-21

Welsh, J. David

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

430 54, 430494, 430396, 430967, 430394, 430 67, 378 28, 358241, 358456, 250362, 2504591, G03G 1322

Patent

active

049505696

ABSTRACT:
The photoconductive layer of an electrophotographic plate, such as used to record radiographic patterns, is overcoated with a thin dielectric layer having luminescing (e.g., fluorescing or phosphorescing) properties. Upon being uniformly charged and imagewise exposed to actinic radiation (i.e. radiation to which the photoconductive layer responds), the resulting charge pattern is developed with toner. The toner-bearing surface of the electrophotographic plate is irradiated with radiation adapted to excite the luminescent overcoat. The toner image serves, in effect, to mask any luminescence by the underlying overcoat, thereby giving rise to a luminescent contrast image which may be recovered by laser scanning or CCD techniques, or photographed directly.

REFERENCES:
patent: 4482619 (1984-11-01), Bayer
patent: 4877699 (1989-10-01), Young et al.

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