F - Mech Eng,Light,Heat,Weapons – 21 – V
Patent
F - Mech Eng,Light,Heat,Weapons
21
V
F21V 3/04 (2006.01) F21V 8/00 (2006.01) G02B 6/24 (2006.01) G09F 9/305 (2006.01)
Patent
CA 2134902
A light diffusing apparatus, which may be used as an elongate visual indicator in telephone sets, video cassette recorders etc, provides very even illumination (i.e., evenly diffused light without any discernible bright spots) when illuminated by spot light from one or two light emitting diodes. The apparatus includes a light guide having a light path of sufficient length to disperse the spot light from the emitting diodes. The dispersed light from the light guide then passes through a light diffuser. The light output end of the light guide and the light input surface of the light diffuser have uniform texture surfaces to further diffuse the dispersed light. The light diffuser may include diffusing particles. Very even illumination without any discernible bright spots is provided.
Bertignoll Friedrich
Koens Paul John
de Wilton Angela C.
Nortel Networks Limited
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