Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 29, 2008
Patent Application Number
10808022
Date Filed
March 23, 2004
Patent Primary Examiner
Patent abstract
An optical transmission device for providing stable communication with a partner device by reducing errors in optical axis misalignment. Such errors are caused by uneven distribution of the light intensity in a received light beam resulting from atmospheric microscopic fluctuations. A cross pattern filter having at least two cross patterns is used at a partner transmission device side with respect to an incident direction detecting means, and arranged so that a cross pattern generated on the position detecting photodetector by the cross pattern filter and parting lines for dividing a position detecting photodetector do not overlap with each other, but intersect with each other.
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