Fiber optic collimator for position encoders

Details Fiber optic collimator for position encoders Fiber optic collimator for position encoders

1991-04-10

1993-06-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, H01J 516

Patent

active

052237060

ABSTRACT:
A collimator/aperture, in an absolute encoder, produces a line of light to illuminate the encoder's code wheel. The collimator employs a bundle of fiber optics to receive an intense and generally cylindrical beam of laser light. The opposing end of the fibers are spread in a fan and clamped between carefully dimensioned clamping surfaces to produce a line of light one fiber thick. The collimator/aperture avoids the wasted energy associated with a slit mask. The fiber optics are held parallel near their light emitting ends and the ends are polished square to the axis of the fibers to provide a high degree of collimation. Fibers with low numerical aperture further improve the collimation.

REFERENCES:
patent: 3481195 (1969-12-01), Hendrickson et al.
patent: 3622793 (1971-11-01), Dalton et al.
patent: 3729047 (1973-04-01), Bohnlein et al.
patent: 4103155 (1978-07-01), Clark
patent: 4334152 (1982-06-01), Dakin et al.
patent: 4731530 (1988-03-01), Mikan
patent: 5006719 (1991-04-01), Blaser
patent: 5015056 (1991-05-01), Yamaguchi et al.

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