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Free space optics communication apparatus and free space optics communication system

  • US 7,409,161 B2
  • Filed: 08/28/2003
  • Issued: 08/05/2008
  • Est. Priority Date: 08/30/2002
  • Status: Expired due to Fees
First Claim
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1. A free space optics communication apparatus which performs communication with another apparatus with light beams, comprising:

  • a plurality of light-emitting units, each of the units emitting a light beam which forms a generally elliptical irradiation pattern on a light-receiving unit of the other apparatus having a shorter diameter direction and a longer diameter direction,wherein the plurality of light-emitting units are set in such a way that an overlapping degree of irradiation patterns of light beams from at least two of the plurality of light-emitting units in the shorter diameter direction at the light-receiving unit of the other apparatus is adjusted, and thereby respective optical axes of the plurality of light-emitting units are inclined with different angles each other with respect to a reference axis of the free space optics communication apparatus so that a width of a combined irradiation pattern formed by combining the light beams from the plurality of light-emitting units is 1.5 times or larger than a width of the irradiation pattern formed by one light-emitting unit in the shorter diameter direction at the light-receiving unit of the other apparatus.

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