Illumination – Revolving
Patent
1993-11-19
1995-02-14
Lazarus, Ira S.
Illumination
Revolving
362 26, 362276, 362339, 362802, F21V 704, F21V 722
Patent
active
053900855
ABSTRACT:
A light diffuser (100) for illuminating a display (304) comprises a rectangular light distributor (108) which is coupled to a light director (208) located along an edge normal to a major axis (110) of the light distributor (108). The light director (208) directs light received from a lamp (14) into the light distributor (108). The light distributor (108) has a polished, planar top surface (210) and a bottom surface (112) comprising a predetermined serration pattern oriented normal to the major axis (110) of the rectangular light distributor (108). The predetermined serration pattern comprises a plurality of grooves (116, 118, 120) having a predetermined pitch gradient corresponding thereto. The plurality of grooves (116, 118, 120) further have roughened surfaces for diffusing light impinging thereon toward the polished, planar top surface (210) of the light distributor (108). The light impinging on the polished, planar top surface (210) at less than a critical angle is coupled through the polished, planar top surface (210 ) to uniformly illuminate the display (304).
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Chen Alan G.
Jelley Kevin W.
King Jeffrey S.
Mari-Roca Gerardo M.
Valliath George T.
Heyman L.
Lazarus Ira S.
Macnak Philip P.
Moore John H.
Motorola Inc.
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