US Patent No. 9,372,101

TRANSMISSIVE OPTICAL ENCODER HAVING OPTICAL WAVEGUIDE


Patent No. 9,372,101
Issue Date June 21, 2016
Title Transmissive Optical Encoder Having Optical Waveguide
Inventorship Akinobu Sakata, Yamanashi (JP)
Assignee Fanuc Corporation, Yamanashi (JP)

Claim of US Patent No. 9,372,101

1. A transmissive optical encoder comprising:
a light emitting element;
a light receiving element;
a rotatable disk provided with slits and rotatable together with an object of detection; and
an optical waveguide having an inlet facing the light emitting element and an outlet facing the light receiving element,
wherein the light emitting element and the light receiving element are arranged on the same side in relation to the rotatable
disk, and

wherein the optical waveguide is fixed independently of rotational movement of the rotatable disk, and
wherein the optical waveguide has an enlarged portion arranged at the inlet and/or the outlet thereof, such that sectional
area of the optical waveguide gradually increases at the enlarged portion.