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Tunnel sensor

  • US 6,243,002 B1
  • Filed: 03/31/1999
  • Issued: 06/05/2001
  • Est. Priority Date: 11/17/1997
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising:

  • a photosensor for sensing ambient light;

    a housing; and

    a channel defined within said housing for providing light to said photosensor, said channel having an upper wall, a lower wall, and two sidewalls;

    wherein the lower wall is inclined more than about two degrees above the horizontal, the upper wall is inclined less than about sixty five degrees above the horizontal, and the included angle between said sidewalls is more than about two degrees and less than about ninety degrees.

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