Patent ID: 6219133
Filing Date: 2001-04-17
Classification: H04B

Abstract:
A spatial optical transmission device comprising:a transmitter which has a plurality of tracking beam transmitters of a divergent type for emitting light at a wide angle, a data beam transmitter of a beam type for emitting light at a narrow angle, an error information beam receiver, and an optical axis control section; anda receiver which has a tracking beam receiver, a data beam receiver, an error information generation section, and an error information beam transmitter of a divergent type;wherein said tracking beam transmitters emit light beams toward a coordinate plane that has a plurality of coordinate axes and has a fixed relative positional relation with said tracking beam transmitters; the optical axes of at least two of said light beams emitted from said tracking beam transmitters are placed on each coordinate axis at different positions; and adjacent light beams among said light beams partially overlap on one of said coordinate axes, the optical intensity of each of said light beams emitted from said tracking beam transmitters showing uneven distribution;wherein said tracking beam receiver is positioned in said coordinate plane, receives said light beams from said tracking beam transmitters, and detects the intensity thereof;wherein said error information generation section calculates positional difference between said tracking beam receiver and a datum point of said coordinate plane based on the detected intensity of said light beams, and generates error information;wherein said error information beam transmitter transmits said error information to said error information beam receiver; andwherein said optical axis control section controls the optical axes of said light beams from said tracking beam transmitters based on said error information so that said tracking beam receiver is positioned at said datum point in said coordinate plane, and also controls the optical axis of the light beam from said data beam transmitter to correspond with said data beam receiver.