Patent ID: 6701093
Filing Date: 2004-03-02
Classification: H04B

Abstract:
An integral transmitter-receiver optical communication apparatus, comprising:a transmitter-receiver device comprising: a transmitter having a laser source for emitting a laser beam modulated in accordance with a transmission information signal; a receiver having a position detecting sensor and a light receiving element each of which receives a complementing modulated laser beam transmitted from a complementing transmitter; and a beam splitting device for splitting said modulated laser beam and said complementing modulated laser beam, which are incident thereon, into two separate laser beams; a telescopic optical system for transmitting said modulated laser beam emitted by said laser source, and for receiving said complementing modulated laser beam transmitted from said complementing transmitter, said telescopic optical system comprising a first afocal optical system; a light beam deflecting device positioned between said telescopic optical system and said transmitter-receiver device, wherein said light beam deflecting device is controlled in accordance with a signal output from said position detecting sensor, and said light beam deflecting device comprises a deflection mirror; and a second afocal optical system positioned between said deflection mirror and said transmitter-receiver device; wherein said first afocal optical system can decrease the beam diameter of a laser beam when said first afocal optical system is moved in a direction from the object side to said deflection mirror, said second afocal optical system can decrease the beam diameter of a laser beam when said second afocal optical system is moved in a direction from said deflection mirror to said transmitter-receiver device, and wherein the following condition is satisfied: m<2(&thgr;3/&thgr;1) â€ƒwherein â€œmâ€  represents the magnification of said first afocal optical system, â€œ&thgr;1â€  represents the maximum off-axis incident angle of an incident ray on said first afocal optical system, and â€œ&thgr;3â€  represents the maximum angle of rotation of said deflection mirror.