Full-frame flash illumination system

Details Full-frame flash illumination system Full-frame flash illumination system

1984-05-08

1985-08-06

Nelli, Raymond A.

Illumination

Display backlight

Lcd backlight

362 98, 355 67, 355 68, 355 69, G09F 1304

Patent

active

045339791

ABSTRACT:
A full-frame flash illumination and imaging system wherein an illumination mechanism compensates for unwanted charge variations on a photoreceptor belt caused by reflections of the lens from the document platen. The area of the belt upon which the negative lens image is formed is predetermined and a controlled quantity of light is directed towards this area, either before, after, or during exposure, to reduce the charge level of the area, to the degree necessary to compensate for the negative lens image. Several illumination mechanisms are disclosed including a programmable LED array and various mask configurations.

REFERENCES:
patent: 3850523 (1974-11-01), Skavnak
patent: 4190347 (1980-02-01), Siegmund
patent: 4250538 (1981-02-01), Durbin et al.
patent: 4334767 (1982-06-01), Lehman
patent: 4335421 (1982-06-01), Modia et al.
patent: 4435064 (1984-03-01), Tsukada et al.
patent: 4472046 (1984-09-01), Kohyama

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