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Vehicular dust sensor

  • US 9,970,856 B2
  • Filed: 10/12/2016
  • Issued: 05/15/2018
  • Est. Priority Date: 03/25/2016
  • Status: Active Grant
First Claim
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1. A vehicular dust sensor comprising:

  • a case having an inner space;

    a light source module disposed in the inner space of the case, and irradiating an air passage with light, the air passage being provided in the light source module for introduction and pass of air and dust;

    a condensing lens to collect light, emitted from the light source module and scattered by dust in air in the air passage;

    a light receiving module receiving the scattered light collected by the condensing lens to output an electric signal corresponding to a dust concentration; and

    an inner housing disposed in the inner space of the case to form the air passage,external light blockages which block introduction of external light while passing the air and the dust therethrough, and are disposed to both end openings of the air passage as entry ports for the air and the dust,wherein each of the external light blockages comprises;

    a tubular body inserted into and disposed to each of the both end openings of the air passage such that an outer surface of the tubular body comes into contact with an inner surface of the air passage; and

    shield walls fixedly disposed on an inner surface of the tubular body to form a passage for introduction of the dust and the air while blocking the external light, andwherein the shield walls are fixedly disposed in opposite sides on the inner surface of the tubular body to form the passage for introduction of the dust and the air in a zigzag form while blocking the external light, and are disposed at intervals in a longitudinal direction of the air passage to form a cross structure.

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