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Temperature detecting device, microwave cooking apparatus using the same, and data correcting method thereof

  • US 4,751,356 A
  • Filed: 01/06/1987
  • Issued: 06/14/1988
  • Est. Priority Date: 01/17/1986
  • Status: Expired due to Fees
First Claim
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1. A temperature detecting device for measuring the temperature of an object from infrared rays emitted by the object, comprising:

  • shutter means for interrupting the path of infrared rays from the object;

    infrared ray detecting means, having an infrared ray permeable surface subject to contamination by deposits of foreign substances, for receiving infrared rays through the infrared ray permeable surface along the path, and for generating a first output corresponding to the intensity of the infrared rays from the object and a second output corresponding to the intensity of infrared rays from the shutter means when the path is interrupted;

    shutter temperature detecting means for directly detecting the actual temperature of the shutter means and for generating a shutter temperature signal; and

    correction means for modifying the first output of the infrared ray detecting means in response to the shutter temperature signal and the second output to thereby compensate for improper readings of the intensity of infrared rays from said object.

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