Light valves for light guides using scattering materials

Details Light valves for light guides using scattering materials Light valves for light guides using scattering materials

1993-02-17

1995-04-18

Bovernick, Rodney B.

Optical waveguides

With optical coupler

Input/output coupler

385 18, G02B 626

Patent

active

054085527

ABSTRACT:
A light valve for regulating light through an optical fiber system includes a scattering panel interposed between first and second light guides. A reflecting surface directs the light from the output end of the first light guide toward the input end of the second light guide, thereby eliminating losses associated with known arrangements. Use of a reflecting surface advantageously provides multiple passes through the scattering panel to increase the contrast ratio between on and off states of the system, if desired.

REFERENCES:
patent: 4274706 (1981-06-01), Tangonan
patent: 4278327 (1981-07-01), McMahon et al.
patent: 4422714 (1983-12-01), Benoit et al.
patent: 4583820 (1986-04-01), Flamand et al.
patent: 4938553 (1990-07-01), Maerz et al.
patent: 5226104 (1993-07-01), Unterleintner et al.

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