Flat wide-angle lens array with a common focus

Details Flat wide-angle lens array with a common focus Flat wide-angle lens array with a common focus

1986-03-24

1988-01-05

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350452, G01V 904, G02B 308

Patent

active

047178213

ABSTRACT:
Array of Fresnel lenses moulded in a single sheet of plastic 29 are used in conjunction with a thermal radiation detector 1 to provide intruder alarm apparatus. Each lens defines one detection direction in a fan of such directions 26,27,28. Such arrays have been moulded as a curved surface 22 centered on the detector. To reduce moulding costs while maintaining the optical efficiencies of all lenses in the array, a flat array of lenses is provided in which each lens is moulded as an angled facet 30,31,32. The poles 36,37,38 of the lenses lie in a plane.

REFERENCES:
patent: 3547546 (1970-12-01), Schier
patent: 4076384 (1978-02-01), Deml et al.
patent: 4321594 (1982-03-01), Galvin et al.
patent: 4367016 (1983-01-01), Willhelm
patent: 4535240 (1985-08-01), Vigurs
Longhurst, R. S. Geometrical and Physical Optics, Second Edition, p. 283, John Wiley & Sons Inc., New York (1967).

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