F - Mech Eng,Light,Heat,Weapons – 21 – V
Patent
F - Mech Eng,Light,Heat,Weapons
21
V
F21V 21/00 (2006.01) F21V 7/00 (2006.01) G09F 13/04 (2006.01) G09F 13/14 (2006.01) G02F 1/13357 (2006.01)
Patent
CA 2057154
ABSTRACT Light Box The light box is provided with a case having arranged therein a reflector directed to the front wall to be illuminated from the rear. The reflector surf ace has a concave curvature. An elongated light source is arranged in the center of the case. The reflector, in the central area thereof, is covered by an optical film having a structured surface directed to the light source. This structure consists of immediately adjacent V-shaped grooves, being parallel to each other and running transverse to the extension of the light source. By total reflection on the structured surface of the transparent optical film as well as by reflection on the reflector surface of the reflector, the light of the light source incident on the reflector is reflected in the direction of the back-lit front side of the light box. This arrangement provides for improved and more-uniform light distribution. SWBAPP1(46857CAN.ABS) 11/13/91
Casalone Roberto
de La Cruz Garcia Alberto
Simmons Adrian
Minnesota Mining And Manufacturing Company
Smart & Biggar
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