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Apparatus with an infrared ray detecting temperature sensor

  • US 4,617,438 A
  • Filed: 12/28/1984
  • Issued: 10/14/1986
  • Est. Priority Date: 01/06/1984
  • Status: Expired due to Term
First Claim
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1. In a microwave oven including a microwave oscillator circuit, and microprocessor means responsive to an output signal from an infrared ray detecting apparatus, for controlling the output power of said microwave oscillator circuit, wherein said infrared ray detecting appparatus comprises:

  • an infrared ray detecting element;

    optical chopper means for making an infrared ray to be measured intermittently incident on said infrared ray detecting element, said optical chopper having at least one bimorph element and a shutter portion mounted to said bimorph element, said shutter portion performing a chopper action in response to displacement of said bimorph element;

    driving means including generator means for generating a driving signal having a substantially square wave shape, wave shaping means for forming a rounded leading edge in said driving signal generated by said generator means, for substantially preventing the production of mechanical noise by said bimorph, and coupling means for coupling said driving signal with a rounded leading edge to said bimorph element for driving said optical chopper;

    said generator means of said driving means including a source of direct current voltage, and DC-DC converter means connected to said source of direct current voltage for producing said driving signal; and

    means responsive to an output signal from said infrared ray detecting element, for producing said output signal of said infrared ray detecting apparatus.

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