Position indicator employing light guides

Details Position indicator employing light guides Position indicator employing light guides

1983-07-15

1986-02-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250221, H01J 516

Patent

active

045729484

ABSTRACT:
An apparatus for indicating the position of a movable member, such as a manual control lever, which uses light signals. The apparatus includes at least three light guides and means for introducing distinctively different, cyclically varying light signals into at least two of the light guides. The degree of optical coupling between the third light guide and each of the other two light guides is controlled in accordance with the position of the movable member. An indication of the position of the member is then provided by detecting the third light signal and indicating the extent to which it exhibits the distinctive characteristics of the first and second light signals.

REFERENCES:
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patent: 3551682 (1970-12-01), Kerhoas et al.
patent: 3556140 (1971-02-01), Granqvist
patent: 3624404 (1971-11-01), Hines
patent: 3844378 (1974-10-01), Balogh
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patent: 4189206 (1980-02-01), Terai et al.
patent: 4190318 (1980-02-01), Upton, Jr.
patent: 4249076 (1981-02-01), Bergstrom et al.
patent: 4459022 (1984-07-01), Morey

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