×

Passive type moving object detection system

  • US 5,461,231 A
  • Filed: 05/10/1994
  • Issued: 10/24/1995
  • Est. Priority Date: 05/11/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A passive type moving object detection system comprising:

  • an infrared detector;

    infrared sensors mounted on the infrared detector;

    a detection field including two columns of detection regions for monitoring a human intruder and two rows of detection regions for detecting a non-human intruder, wherein the columns of detection regions have a height covering a human height;

    an optical system located between the infrared detector and the detection field;

    the infrared sensors having infrared accepting areas comprising a first section and a second section wherein the first section optically corresponds to the columns of detection regions and the second section optically corresponds to the rows of detection regions, so as to receive infrared rays radiating from a moving object passing through the detection regions, the sensors including two columns of sensors and two rows of sensors, the columns of sensors optically corresponding to the columns of detection regions, and the rows of sensors optically corresponding to the rows of detection regions, wherein the columns of sensors are connected to each other with opposite polarity, and the rows of sensors are connected to each other with opposite polarity; and

    the detector including an arithmetic circuit which makes subtraction between the peak values of signals generated by the detector, and a decision circuit whereby the balance of subtraction is compared with a reference level.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×