Patent ID: 7076171
Filing Date: 2006-07-11
Classification: H04B

Abstract:
1. An optical space transmitter comprising: a light source for emitting a light beam modulated according to a signal to be transmitted; an optical system for sending out the light beam emitted from said light source as a transmission light beam with an angle of expansion; a temperature detector for detecting the internal temperature of said optical space transmitter; control means for controlling said optical space transmitter such that the angle of expansion increases when the internal temperature detected by said temperature detector rises; and angle correcting means for correcting the angular displacement between the light beam to be transmitted and a received light beam. wherein said control means includes a computing circuit for determining by computation an appropriate angle of expansion of the light beam to be transmitted on the basis of the temperature detected by said temperature detector and a drive means for driving at least part of said optical system in the direction of the optical axis according to the outcome of the computation of the computing circuit.