Patent ID: 7515782

Claim:
A two-channel fiber optic rotary joint for optic signal transmissions comprising: a pair of relatively rotatable members comprising a rotor and a stator; said rotor is mounted in said stator to rotate relatively thereto through a pair of ceramic ball bearings; a first fiber optical collimator assembly being secured in a central hole of one of said rotatable members; a second fiber optical collimator assembly being secured in a central hole of another of said rotatable members; a shaft seal, a seal holder and o-ring means to seal the collimator assembly of said stator and said rotor to form a sealed space with said first fiber optical collimator assembly and second fiber optical collimator assembly; wherein each of said first fiber optical collimator assembly and said second fiber optical collimator assembly further comprises: a holder with an angled end surface; a conventional collimator secured in an off-axis hole of said holder with an angled end surface through a hollow collimator housing with its own axis parallel to a rotational axis; a first reflecting surface located on the front end of said hollow collimator housing at a specific angle with the axis of said conventional collimator and parallel to said angled end surface of said holder; a second reflecting surface being formed on said angled end surface of said holder; a first fiber secured in a central hole of the holder of said first fiber optical collimator assembly and protruded out of said central hole of the holder of said first fiber optical collimator assembly; and a second fiber secured in a central hole of the holder of said second fiber optical collimator assembly and recessed inside said central hole of the holder of said second fiber optical collimator assembly.