Optical detector for windshield wiper control

  • US 5,313,072 A
  • Filed: 02/16/1993
  • Issued: 05/17/1994
  • Est. Priority Date: 02/16/1993
  • Status: Expired due to Fees
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First Claim
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1. A method of detecting obscuring moisture on a windshield of an automotive vehicle, comprising the steps of:

  • illuminating the windshield with a source of light;

    imaging said source of light along an optical axis and onto an imaging plane;

    providing a light detector array having a plurality of light sensors on said imaging plane and centered on said optical axis for detecting said imaged source of light;

    detecting intensity of said light imaged on a central one of said light sensors located on said optical axis;

    detecting intensity of said light imaged on other ones of said light sensors located off said optical axis; and

    measuring the intensity of said detected off-axis light versus said detected on-axis light for determining the presence of obscuring moisture on said windshield.

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