Lighting control system with infrared occupancy detector

Details Lighting control system with infrared occupancy detector Lighting control system with infrared occupancy detector

1985-11-05

1987-10-27

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340567, H01J 4014

Patent

active

047031719

ABSTRACT:
A lighting control device utilizes an infrared occupancy detector in order to control the lights in a room or area. The occupancy detector monitors changes in infrared energy, which indicate movement within the area, by receiving infrared energy in a plurality of fields of view spread out over an arc of approximately 180.degree.. As a result the device may be installed on a wall of a room or area and still cover the entire area. The wide spread of the fields of view is accomplished with off-axis Fresnel lens segments arranged in series and by partially reflecting the energy received by some of the lens segments into the infrared detector.

REFERENCES:
patent: 3958118 (1976-05-01), Schwarz
patent: 4258255 (1981-03-01), Guscott
patent: 4450351 (1984-05-01), Fraden
patent: 4523095 (1985-06-01), Keller-Steinbach
patent: 4644147 (1987-02-01), Zublin

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