Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1977-01-31
1978-05-02
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, G01D 534, G02B 514, H01J 516
Patent
active
040876845
ABSTRACT:
A fiber optic feedback control system for controlling a motor having an output for driving a condition controlling device, is disclosed which comprises a fiber optic having a first flared end, a light source for supplying light to the first flared end, a shadow mask between the light source and the first flared end having a position dependent upon the output of the motor, a second flared end for supplying light to a pair of photocells under the control of a condition responsive element and means for connecting the photocells to the motor whereby, upon movement of the condition responsive device, one of the photocells receives light from the second flared end of the fiber optic to energize the motor in a specific direction which repositions the shadow mask between the light source and the first flared end to block out light supplied to the photocells, the resulting position of the output of the motor being proportional to the movement of the condition responsive element.
REFERENCES:
patent: 2199071 (1940-04-01), Gale
patent: 2954479 (1960-09-01), Cibelius, Jr.
patent: 3495777 (1970-02-01), Evalds et al.
patent: 3693022 (1972-09-01), Dumasy et al.
patent: 3779628 (1973-12-01), Kapron et al.
patent: 3788795 (1974-01-01), Zeitlin
patent: 3931514 (1976-01-01), Patterson
Elijah, "Temperature Sensing", IBM Technical Bulletin, vol. 13, No. 3, Aug. 1970, p. 758.
Honeywell Inc.
Joike Trevor B.
Moore David K.
Smith Alfred E.
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