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Detection of raindrops on a pane by means of a camera and lighting

  • US 9,335,264 B2
  • Filed: 09/20/2011
  • Issued: 05/10/2016
  • Est. Priority Date: 11/30/2010
  • Status: Active Grant
First Claim
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1. A device for detecting rain (4) on an outer surface of a pane, comprisinga camera disposed behind an inner surface of the pane (2), wherein the camera (1) is focused onto a far range that lies in front of the outer surface of the pane (2), anda lighting source (3) adapted to generate a source light beam and configured and arranged to direct the source light beam (h;

  • n) through air onto the inner surface of the pane (2) so as to cause a resultant transmitted beam that is transmitted in the pane and impinges on the outer surface within the pane and is partially reflected from the outer surface (2.2) within the pane (2) to cause a partially reflected beam (r2;

    r2

    ) that impinges on the camera (1); and

    wherein the camera is configured and adapted to measure a light quantity of the partially reflected beam (r2;

    r2

    ) impinging on the camera.

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