Luminescent screen laser scanning technique

Details Luminescent screen laser scanning technique Luminescent screen laser scanning technique

H - Electricity

04

N

350/5, 88/96.8

H04N 1/46 (2006.01) H04N 1/48 (2006.01)

Patent

CA 1092700

LUMINESCENT SCREEN LASER SCANNING TECHNIQUE ABSTRACT OF THE DISCLOSURE A laser scanning systems for scanning an original color document with light of three different colors. In a first operative sequence, the output from a laser, which comprises light of a first color, is incident upon a rotating scanning member, the light therefrom being directed to a reflecting first portion of a luminescent screen, the light reflected from said first screen portion completely scanning the entire original document. In a second operative sequence, the laser light from said rotating scanning member is directed to a second portion of said luminescent screen having a material associated therewith which produces light of a second color in response to the incident laser light, the light produced by said second portion of said luminescent screen scanning the entire original document. In a third operative sequence, the laser light from said rotating scanning member is directed to third portion of the luminescent screen having a material associated therewith which produces light of a third color in response to the incident laser light, the light produced by said third portion of said luminescent screen scanning the entire original document. The light reflected from the original document corresponding to the informational content thereof is detected and an electrical signal generated in response thereto, the electrical signal being utilized locally or transmitted to a remote modulated scanner to produce a color copy of the original document. In an alternate embodiment, the light produced by each screen portion is caused to scan, in sequence an elemental area of the original document.

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