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Security sensor having disturbance detecting capability

  • US 6,529,129 B1
  • Filed: 02/09/2001
  • Issued: 03/04/2003
  • Est. Priority Date: 02/18/2000
  • Status: Expired due to Term
First Claim
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1. A security sensor having a disturbance detecting capability, which comprises:

  • a carrier body having an infrared sensor element;

    an incident side enclosure mounted on the carrier body, said incident side enclosure comprising a lens that defines at least one detection area for the infrared sensor element or a cover that covers an incident surface area of the infrared sensor element;

    a light projecting element for projecting a disturbance detecting beam;

    a light receiving element for receiving at least a portion of the disturbance detecting beam;

    first and second light guide members separate from each other with a space therebetween and operatively associated with the light projecting element and the light receiving element, respectively, said first and second light guide members being cooperative with each other to define an optical path along and adjacent an outer surface of the incident side enclosure or an outer surface of the carrier body adjacent the incident side enclosure so as to extend between the first and second light guide members;

    a detecting circuit for detecting a presence or absence of an obstacle, applied to at least one of the first and second light guide members, based on an amount of light received by the light receiving element; and

    surface irregularities formed on a light transmitting surface or a light reflecting surface of the first or second light guide members which surface is exposed traverse to the optical path.

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