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Windshield wiper system with rain detector

  • US 5,015,931 A
  • Filed: 06/11/1990
  • Issued: 05/14/1991
  • Est. Priority Date: 06/12/1989
  • Status: Expired due to Term
First Claim
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1. A windshield wiper system for a vehicle, comprising a windshield transparency detector which include a plurality of sources of frequency modulated light and a plurality of sensors for said light, said sources and sensors being arranged in a two dimensional array on a common zone of the windshield, each source radiating nondirectional light to propagate in said windshield to impinge upon each of said sensors, the system further comprising a demodulation circuit associated with each said light sensor for demodulating each of the frequencies of the light from said sources and for providing a signal corresponding to each demodulation.

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