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RAIN SENSOR

  • US 20110242540A1
  • Filed: 02/17/2011
  • Published: 10/06/2011
  • Est. Priority Date: 04/02/2010
  • Status: Abandoned Application
First Claim
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1. A rain sensor mounted on a windshield of a vehicle, comprising:

  • a housing having an opening;

    at least an emitter disposed in the housing and being used to emit light beams;

    a coupler connecting with the housing and covering the opening of the housing, comprising;

    at least a collimator corresponding to the emitter to completely receive the light beams emitted from the emitter and to collimate the light beams into collimated light beams; and

    at least a groove having a deflection surface corresponding to the collimator, and being used to reflect the collimated light beams that passes through the collimator and is incident to the deflection surface at an incident angle θ

    to the windshield, andan optical detector disposed in the housing and being used to receive the collimated light beams reflected by the windshield and to generate electrical signals in response to the collimated light beams;

    characterized in that the collimated light beams incident to the coupler satisfies the following condition;


    1.27<

    n*sin θ

    <

    1.52wherein n is refractive index of the coupler, and θ

    is the incident angle of the collimated light beams incident to the deflection surface.

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