Encoder with fiber optic collimator/aperture

Details Encoder with fiber optic collimator/aperture Encoder with fiber optic collimator/aperture

G - Physics

01

B

G01B 11/26 (2006.01) G01D 5/347 (2006.01) G02B 6/04 (2006.01)

Patent

CA 2061231

-i- Abstract of the Disclosure 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.

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