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Motion detector

  • US 4,645,930 A
  • Filed: 12/24/1984
  • Issued: 02/24/1987
  • Est. Priority Date: 12/23/1983
  • Status: Expired due to Fees
First Claim
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1. A motion detector responsive to incident radiation, comprising:

  • a box having a pair of opposite ends, and two pairs of opposing walls extending between said ends, an inlet opening for said incident radiation being provided generally at one of said ends, at least one of said pairs of walls being provided internally with reflecting surfaces;

    focusing optics including a concave mirror mounted in said box at the other of said ends and being concave in the direction of said one of said ends;

    radiation sensing means ahead of said one of said ends of said box having an optical axis generally directed toward said other end of said box for outputting a signal representing motion in horizontal and vertical sensing field planes from which said incident radiation enters said box through said opening and is reflected toward and focussed upon said radiation sensing means by said optics and said reflecting surfaces; and

    at least two relectors independent of said walls for radiation each from an respective one of said field planes flanking an aperture through which said radiation is focussed upon said radiation sensing means, said reflectors diverging away from said optical axis of said radiation sensing means toward said optics and including angles of up to 20°

    with said axis.

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