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Water drop detector or transparent substrate and initiating method and output stabilizing method therefor

  • US 6,097,167 A
  • Filed: 07/22/1998
  • Issued: 08/01/2000
  • Est. Priority Date: 07/22/1997
  • Status: Expired due to Fees
First Claim
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1. A method for initiating a rain sensor which detects an amount of water drops adhering to or present upon a front surface of a windshield and outputs a driving signal to a wiper driver device, comprisinga light emitting means for guiding light into said windshield so as to cause internal reflection to occur upon interior surfaces thereof;

  • anda light receiving means for receiving the light reflected within said windshield, wherein an output signal of said light receiving means is inputted into the wiper driver device through a delay means when initiating the rain sensor said delay means is an on-delay timer.

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