Renco Encoders Inc.

Dr. Johannes Heidenhain Gmbh

Paul Marvin Johnson

A scale for a position encoder that includes a first graduation track having a first set of markings that are periodically arranged with a defined graduation period &#x394;, a second graduation track having a second set of markings that are periodically arranged with a defined graduation period &#x394;, wherein the second graduation track is shifted relative to the first graduation track by a distance &#x394;/4. A third graduation track having a third set of markings that are periodically arranged with a defined graduation period &#x394;, wherein the first, second and third graduation tracks are positioned such that at any one time at least one, but never three, of the first, second and third graduation tracks will transmit light directed upon the scale.

Growing community of inventors

Santa Barbara, CA, United States of America

Paul Marvin Johnson