Pyroelectric infrared sensor

  • US 4,437,002 A
  • Filed: 04/15/1981
  • Issued: 03/13/1984
  • Est. Priority Date: 04/21/1980
  • Status: Expired due to Term
First Claim
Patent Images

1. A pyroelectric infrared sensor, comprising:

  • a can having a window with an optical filter attached thereto;

    a pyroelectric ceramic element;

    a field-effect transistor provided with electric terminals; and

    a stem having a tab, wherein;

    said pyroelectric ceramic element has two back electrodes on the back surface thereof and at least two front electrodes on the front surface thereof, each of said at least two front electrodes having a first region overlapping with a part of one of said back electrodes and a second region overlapping with a part of the other of said back electrodes;

    each of said at least two front electrodes are arranged adjacent to each other and are electrically insulated from each other; and

    said first regions and said second regions of said at least two front electrodes have a ratio of areas of approximately 1;

    1.

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