Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-07-01
1984-10-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250229, G02B 514
Patent
active
044777248
ABSTRACT:
A switching device comprises two optical fibres disposed in two respective supports located one in line with the other. One of these supports is articulated about a transverse axis and loaded by a leaf spring which tends to space its free end from the adjacent end of the other support. The adjacent ends of these supports have oblique faces whose angles are supplementary and the movable support has a window exposing a portion of the fibre adjacent to its bevelled end. This fibre is associated with a light-emitting diode and the other fibre with a photodetector. When the adjacent ends of the fibres are spaced apart the light is reflected through the window, and when they are in optical contact the light is transmitted to the photodetector.
REFERENCES:
patent: 4071753 (1978-01-01), Fulenwider et al.
patent: 4204742 (1980-05-01), Johnsen et al.
patent: 4315147 (1982-02-01), Harmer
patent: 4384203 (1983-05-01), Wells
Article in Applied Optics, vol. 19, No. 1, Jan. 1980 by W. B. Spillman Jr. et al., entitled "Frustrated-total-internal-reflection/multimode fiber-optic hydrophone.
Brady et al., "Solid-State Optical Switch", vol. 20, No. 11A, IBM Technical Disclosure Bulletin, Apr. 1978; p. 4652.
Battelle (Memorial Institute)
Dubno Herbert
Nelms David C.
Ross Karl F.
Westin Edward P.
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