Illumination – Illuminated scale or dial – Internal light source
Patent
1991-12-05
1993-07-06
Lazarus, Ira S.
Illumination
Illuminated scale or dial
Internal light source
362260, 362328, 362329, 362339, 362347, G01D 1128, F21V 902
Patent
active
052247708
ABSTRACT:
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.
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Casalone Roberto
de la Cruz Garcia Alberto
Simmons Adrian
Buckingham Stephen W.
Griswold Gary L.
Kirn Walter N.
Lazarus Ira S.
Minnesota Mining and Manufacturing Company
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