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Infrared-rays detector

  • US 6,313,462 B1
  • Filed: 02/25/1999
  • Issued: 11/06/2001
  • Est. Priority Date: 02/27/1998
  • Status: Expired due to Term
First Claim
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1. An infrared-rays detector comprising:

  • a pyroelectric element which intermittently outputs a first current characteristic of noise caused by ambient conditions, and which outputs a second current different from the first current in the presence of a human body;

    a current-to-voltage converter which converts current from said pyroelectric element to a voltage signal, said current-to-voltage converter intermittently outputting a first waveform corresponding to said first current, and outputting a second waveform corresponding to said second current and different from said first waveform in the presence of a human body; and

    a signal processor which performs waveform analysis on the voltage signal received from said current-to-voltage converter and outputs a detection signal when the second waveform generated by a human body is detected by the waveform analysis but does not output a detection signal when the first waveform is detected by the waveform analysis.

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