Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-02-18
1976-06-22
La Roche, Eugene
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231SE, 250233, 250237R, 3403091, H01J 3912, G08B 100
Patent
active
039653498
ABSTRACT:
The invention relates to a programmable timing device of the type which controls a utility unit such as a heating plant on a daily and weekly schedule. The timing device includes clock works and a rotatable unit driven by the clock works. A reflecting disc having a reflecting surface is mounted on the rotatable unit for rotation therewith. A stationary unit holds a light source which directs a light beam towards the reflecting disc. A program disc is mounted on the rotatable unit between the reflecting disc and the stationary unit. The program disc has a predetermined form for masking certain portions of the reflecting surface from the light beam as the rotatable unit rotates relative to the stationary unit. The timing device includes a light sensor for receiving a reflection of the light beam from the reflecting surface. The light sensor is held by the stationary unit in close proximity to the light source.
REFERENCES:
patent: 1618242 (1927-02-01), Thompson
patent: 2080330 (1937-05-01), Ottaway
patent: 3290507 (1966-12-01), Flieg et al.
patent: 3399347 (1968-08-01), Martens
Danfoss A/S
La Roche Eugene
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