Dust detector for vacuum cleaner

  • US 5,163,202 A
  • Filed: 08/14/1991
  • Issued: 11/17/1992
  • Est. Priority Date: 06/15/1988
  • Status: Expired due to Term
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First Claim
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1. A dust detector for a vacuum cleaner, comprising:

  • a dust suction passage for passing dust therethrough;

    a light-emitting element for emitting light into said dust suction passage;

    a light-emitting element cover disposed perpendicular to an axis of said dust suction passage for covering and holding in place said light-emitting element, said light-emitting element cover substantially enclosing said light-emitting element and being transmissive to said emitted light;

    a light-emitting element cover end face exposed to said dust suction passage, said light-emitting element cover end face being flush with an inner wall surface of said dust suction passage and having a diameter equal to or less than the diameter of said light-emitting element;

    a light-detecting element disposed to receive light emitted by said light-emitting element for detecting said light;

    a light-detecting element cover disposed perpendicular to said axis of said dust suction passage for covering and holding in place said light-detecting element, said light-detecting element cover substantially enclosing said light-detector and being transmissive to said emitted light;

    a light-detecting element cover end face exposed to said dust suction passage, said light-detecting element end face being flush with an inner wall surface of said dust suction passage and having a diameter equal to or less than the diameter of said light-detecting element; and

    a detector unit, coupled to said light-detecting element, for determining the amount of said dust passing through said dust suction passage, said detector unit being responsive to the intensity of light detected by said light-detecting element.

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