Patent
1987-05-08
1988-11-29
Lee, John D.
350 9610, 350259, G02B 600
Patent
active
047877081
ABSTRACT:
A variety of techniques are used to effect continuously controlled emission of light from a light guide. For example, the light guide may contain a mechanism formed of a substantially non-light absorptive material having a density which varies as a function of the length of the light guide. The mechansim causes light to escape from the light guide at a rate which varies along the length of the light guide, such that the amount of light escaping, per unit length, along the light guide has a selected distribution of values. Alternatively, the light guide's central path may be non-linear. As a further alternative, the average cross-sectional dimension of each of the plane segments aforesaid may be non-constant. As yet another alternative, a first portion of the light guide may comprise prism light guide material and the remaining portion may be such that a substantial portion of light incident thereupon is allowed to escape therethrough.
REFERENCES:
patent: 3829675 (1974-08-01), Mariani
patent: 4105293 (1978-08-01), Aizenberg et al.
patent: 4260220 (1981-04-01), Whitehead
patent: 4459642 (1984-07-01), Mori
patent: 4615579 (1986-10-01), Whitehead
Pearson, "Piping Light with Acyrilic Materials", Modern Plastics pp. 123-127; Aug. 1946.
Heartney Phan
Lee John D.
TIR Systems Ltd.
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