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Light detection apparatus

  • US 6,590,222 B1
  • Filed: 06/18/2001
  • Issued: 07/08/2003
  • Est. Priority Date: 12/18/1998
  • Status: Expired due to Fees
First Claim
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1. Light detection apparatus for determining the location of a body within an area, the apparatus comprising:

  • at least two light detecting devices for mounting on the body and capable of receiving light from the environment in which the body is located, the devices being located at respective detecting points which are angularly spaced about a vertical axis, means for supplying information representative of the levels of at least two different light types received at each detecting point, and means for comparing information received from the light detection apparatus with information previously received from the light detection apparatus and stored in a memory so as to identify when the light detected by the light detection apparatus is the same or substantially the same as light previously detected by the light detection apparatus.

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