REFLECTIVE OPTICAL ENCODER HAVING RESIN-MADE CODE PLATE

摘要

A reflective optical encoder, which is inexpensive and is compact in the axial direction thereof. An encoder has a generally circular code plate fixed to a rotating body such as a rotation shaft of a motor; and a light emitting unit and a light receiving unit which are positioned near a first major surface of the code plate. The code plate is made from a light transmissive resin, and on the first major surface, an incidence portion with a concavo-convex shape and an emission portion with a concavo-convex shape are formed. On a second major surface opposed to the first major surface, a transmission portion formed from a concavo-convex shape and configured to transmit light, and a total reflection portion formed from a flat surface and configured to totally reflect light, are formed, wherein the transmission portion and the total reflection portion constitute a code pattern section.

主权项

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 second major surface of the code plate, wherein the first major surface of the code plate has an incidence portion with a concavo-convex shape and an emission portion with a concavo-convex shape, and wherein the second major surface of the code plate has a code pattern section including a transmission portion formed from a V-shape, a triangular shape or a curved surface and configured to transmit light, and a total reflection portion formed from a flat surface and configured to totally reflect light.