US Patent No. 9,518,846

REFLECTIVE OPTICAL ENCODER HAVING RESIN-MADE CODE PLATE


Patent No. 9,518,846
Issue Date December 13, 2016
Title Reflective Optical Encoder Having Resin-made Code Plate
Inventorship Akinobu Sakata, Yamanashi (JP)
Nobuyuki Ootake, Yamanashi (JP)
Assignee Fanuc Corporation, Yamanashi (JP)

Claim of US Patent No. 9,518,846

1. A reflective optical encoder comprising:
a code plate which is formed by resin material and has a first major surface and a second major surface opposed to the first
major surface;

a light emitting unit positioned near the first major surface of the code plate; and
a light receiving unit positioned near the first major surface of the code plate,
wherein the first major surface of the code plate has:
1) an incidence portion with a concavo-convex shape allowing light transmitted from the light emitting unit to enter the code
plate through the first major surface, and

2) an emission portion with a concavo-convex shape allowing the light to exit the code plate through the first major surface,
and

wherein the second major surface of the code plate has a code pattern section including:
1) a transmission portion formed from a V-shape, a triangular shape or a curved surface and configured to allow the light
to exit the code plate through the second major surface, and

2) a total reflection portion formed from a flat surface and configured to totally reflect the light from the second major
surface.