G - Physics – 02 – B
Patent
G - Physics
02
B
88/116
G02B 5/00 (2006.01) G02B 5/04 (2006.01)
Patent
CA 1272409
Abstract: A glare-proof transparent cover plate for use in front of a display screen or illuminated automobile instrument has a back in the form of a flat plane and a front formed with a parallel arrangement of minute, sawtooth ridges each having a horizontal facet extending substantially perpen- dicularly to the flat plane, and an inclined facet inclined to the flat plane at an inclination satisfying the equation .alpha. ? (.beta. + .omega.)/2, where .alpha. is the inclination of each inclined facet to the flat plane, .beta. is the angle of refraction of the incident rays of light within the plate, and .omega. is the critical angle of the material forming the plate. The arrangement provides a significant reduction in unwanted light (glare) seen by a viewer in front of the plate.
523443
Kirby Eades Gale Baker
Nippon Seiki Co. Ltd.
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