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Microwave oven with improved defrosting mode

  • US 4,841,111 A
  • Filed: 11/12/1987
  • Issued: 06/20/1989
  • Est. Priority Date: 11/13/1986
  • Status: Expired due to Fees
First Claim
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1. A microwave oven capable of operating in a defrosting mode for defrosting a frozen article comprising an oven cavity in which a frozen article to be defrosted is placed, a microwave generator for radiating microwave energy into said cavity for heating said article, humidity sensor means for sensing a change in the humidity of the air in said cavity, fan means for producing an air flow across said article to said humidity sensor means, control means for controlling the duration of the generation of microwave energy into said cavity radiated from said microwave generator in accordance with the humidity sensed by said humidity sensor means, characterized in that, when said oven is in said defrosting mode, said control means determining the duration of the generation of energy from said microwave generator into said cavity and therefore the duration of the defrosting mode solely in accordance with the change in humidity sensed by said humidity sensor means, said change in humidity corresponding to a humidity gradient and interruption of the defrosting mode is effected when the humidity sensor means detects a predetermined positive humidity gradient.

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