Vacuum cleaner

  • US 6,023,814 A
  • Filed: 09/15/1997
  • Issued: 02/15/2000
  • Est. Priority Date: 09/15/1997
  • Status: Expired due to Fees
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First Claim
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1. A vacuum cleaner comprising;

  • a vacuum cleaner body,a suction fan which is provided at a predetermined position of the vacuum cleaner body,suction passage means for sucking in air with dust, and for guiding the dust and the air to the vacuum cleaner body,a dust sensor of a light emitting and light receiving type which is provided at a predetermined position along the suction passage means, and has a dust detection sensitivity,sensitivity correction means for correcting the dust detection sensitivity of the dust sensor, andlimit detection means for detecting a condition in which correction of the dust detection sensitivity by the sensitivity correction means reaches a limit value.

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