Plural-channel optical rotary joint

Details Plural-channel optical rotary joint Plural-channel optical rotary joint

1984-07-05

1987-02-17

Sikes, William L.

350 9610, 350 9615, G02B 636

Patent

active

046435212

ABSTRACT:
An optical rotary joint has a first pair of light beam expanding graded index (GRIN) of refraction lenses coupled to ends of a first pair of lightguide fibers for coupling signals through the rotary joint interface in a first path which is coaxial with the axis of rotation in the interface. A second pair of lightguide fibers are coupled to a second pair of GRIN lenses off-axis and of much smaller diameter than the lenses of the first pair. Prisms couple signals between the off-axis lenses and a second path across the interface and which is also coaxial with the axis of rotation. Also shown is a method for compensating for lens irregularities.

REFERENCES:
patent: 3829195 (1974-08-01), Rawson
patent: 4027945 (1977-06-01), Iverson
patent: 4165913 (1979-08-01), Fitch
patent: 4220411 (1980-09-01), Cowen
patent: 4239330 (1980-12-01), Ashkin et al.
patent: 4268112 (1981-05-01), Peterson
patent: 4378144 (1983-03-01), Duck et al.
patent: 4401360 (1983-08-01), Streckmann et al.
patent: 4401365 (1983-08-01), Mizokawa et al.
"Fiber Optic Rotary Joints--A Review", IEEE Transactions on Components, Hybrids, and Manufacturing Technology, vol. CHMT-5, No. 1, Mar. 1982, Glenn F. Dorsey, pp. 37-41.

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