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Battery-operated security system sensors

  • US 5,790,040 A
  • Filed: 12/13/1996
  • Issued: 08/04/1998
  • Est. Priority Date: 12/13/1996
  • Status: Expired due to Fees
First Claim
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1. A security system sensor comprising:

  • a lens lying in a forward plane for focusing received energy to a focal point rearward of the forward plane;

    a sensing element having a forward surface located substantially at the focal point of the lens, the sensing element defining a rearward plane that is immediately rearward of the sensing element and parallel to the forward plane of the lens, the and the sensing element defining a funnel-shaped chamber that is substantially vacant and encompasses the volume between the lens and the forward surface;

    a battery housing positioned such that a battery power source contained therein has the majority of its volume rearward of the funnel-shaped chamber and forward of the rearward plane; and

    wherein the security system sensor has a volume of about 15 cubic inches or less.

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