Method of and apparatus for detecting light and controlling jalo

Details Method of and apparatus for detecting light and controlling jalo Method of and apparatus for detecting light and controlling jalo

1975-03-14

1976-06-22

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

49 82, 160 5, 250239, G01D 536

Patent

active

039653480

ABSTRACT:
A photosensitive surface is enclosed behind a wall formed with a vertically open slit which forms with the surface a vertical angle of 80.degree.. This slit is open about 3.degree. and is displaced horizontally past the surface through at least 150.degree. so as to let parallel rays of sunlight fall onto this surface and suppress diffuse nonparallel ground light. The wall can be carried on a support also carrying the photosensitive surface, e.g. a photoresistor, photocell, or photodiode, which is used to control an awning, roller blinds, or the like.

REFERENCES:
patent: 3064131 (1962-11-01), Brown
patent: 3098152 (1963-07-01), Von Mathes
patent: 3239672 (1966-03-01), Gabloffsky
patent: 3371214 (1968-02-01), Berryman
patent: 3733493 (1973-05-01), McClleland
patent: 3864566 (1975-02-01), Simpson et al.

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