Apparatus for the control of venetian blinds including photodete

Details Apparatus for the control of venetian blinds including photodete Apparatus for the control of venetian blinds including photodete

1991-04-23

1992-08-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

160 5, G01J 120

Patent

active

051421330

ABSTRACT:
The lowering and raising of slats of a venetian blind are controlled by control signals from a photodetector circuit which is mounted adjacent to the venetian blind and which acts responsive to predetermined limit values of the background brightness being exceeded. Following lowering of the venetian blind, control of the closing or screening angle of the slats is provided by a sun-tracking photodetector affixed to a slat and operating in dependence upon the angular alignment of the slat. In order to fix the closing angle of the slats at a selected value, subsequent adjustment of the slats is controlled by the sun-tracking photodetector which can, in turn, be controlled externally by a manually operated keying mechanism. The photodetector used in measurement of background brightness comprises three aligned photodiodes which are directed skyward in three different directions and which together detect the incident light over the full range of 180.degree. in front of the venetian blind.

REFERENCES:
patent: 3478219 (1969-11-01), Nutz
patent: 3646985 (1972-03-01), Klann
patent: 4273999 (1981-06-01), Pierpoint
patent: 4429952 (1984-02-01), Dominguez
patent: 4644990 (1987-02-01), Webb, Sr. et al.
patent: 4773733 (1988-09-01), Murphy, Jr. et al.
patent: 4841672 (1989-06-01), Nebhuth et al.

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