Dust detector for vacuum cleaner
First Claim
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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Accused Products
Abstract
A dust detector in a vacuum cleaner includes a light-emitting element exposed into a dust suction passage for emitting a light beam into the dust passage, and a light-detecting element exposed into the dust suction passage for detecting the light beam emitted from the light-emitting element. A detector unit detects the amount of dust flowing through the dust suction passage based on the intensity of the light beam transmitted from the light-emitting element across the dust suction passage to the light-detecting element. The light-emitting element and the light-detecting element are covered respectively by a pair of light-transmissive covers having respective end faces exposed into the dust suction passage and lying flush with an inner wall surface of the dust suction passage.
225 Citations
7 Claims
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1. A dust detector for a vacuum cleaner, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification