Optical waveguides – With optical coupler – Movable coupler
Patent
1997-10-02
1999-11-23
Lee, John D.
Optical waveguides
With optical coupler
Movable coupler
385 25, G02B 626
Patent
active
059914785
ABSTRACT:
Unidirectional and bidirectional fiber optic rotary joints are disclosed for coupling at least one optical signal across a rotary interface. The unidirectional joint includes a stator having a waveguide. A rotor is rotatable through a full 360.degree. revolution and is concentric to the stator. Light transmitters are positioned on a first circumference and connected to one of the stator and the rotor. Each of the transmitters emits an optical signal. Light receivers are positioned on a second circumference and connected to the other one of the stator and the rotor. Each of the transmitted optical signals is emitted tangentially into the waveguide and is reflected in short chordal lengths along the waveguide. Each optical signal is received by at least one of the second plurality of light receivers through the full 360.degree. revolution of the rotor. The number of light receivers is greater than the number of light transmitters. Certain receivers do not receive an optical signal during a portion of the 360.degree. revolution of the rotor.
REFERENCES:
patent: 4109997 (1978-08-01), Iverson
patent: 4525025 (1985-06-01), Hohmann et al.
patent: 4643521 (1987-02-01), Harstead et al.
patent: 5555334 (1996-09-01), Ohnishi et al.
Publication 9702: "New Technologies--In Detail, The Fluorescent Optical Rotary Joint", Schleifring und Apparatebau GmbH, Internet: http://www.schleifring.de/Publication%209702.htm, last updated Apr. 7, 1997.
Bowman Anthony Lee
Duncan Michael P.
Lewis Norris Earl
Rogers, Sr. Robert Thomas
Hao Victoria D.
Lee John D.
Litton Systems Incorporated
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