Apparatus for lighting of liquid crystal

Details Apparatus for lighting of liquid crystal Apparatus for lighting of liquid crystal

1992-02-25

1992-11-10

Husar, Stephen F.

Illumination

Revolving

362245, 362318, 362224, F21V 704

Patent

active

051618737

ABSTRACT:
With the aim of mitigating a decrease in flux of light and improving the light utilization efficiency, an optical conductor used in a liquid crystal lighting apparatus is constructed of a plurality of refractive layers N.sub.1, N.sub.2, . . . , N.sub.i of different refractive indices which are gradually lowered from light incident end surfaces to a center portion of the optical conductor. Light coming from the light incident end surfaces is refracted at interfaces of the refractive layers N.sub.1, N.sub.2, . . . , N.sub.i so as to reach a light outgoing surface at an incident angle .theta..sub.i which is smaller than a critical angle .theta..sub.w, thereby preventing all the beams from undergoing total reflection at the light outgoing surface and shortening the optical length in the optical conductor.

REFERENCES:
patent: 4860171 (1989-08-01), Kojima
patent: 5046826 (1991-10-01), Iwamoto et al.

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