コード補正によるロータリエンコーダの高精度化

抄録

This paper describes a method of improving the resolution and accuracy of incremental type rotary encoders by interpolating the scale pitch interval using the phase encoding and code compensation system. Several interpolation methods have been proposed which stand on the assumption that the scale intervals are accurate. But the experiment on an optical encoder system revealed that the scale pitch intervals include error.
The interpolation method proposed in this paper compensates the error in the pitch intervals as well as the error caused by the nonlinearity of the detected signals. By applying this system to an optical incremental type rotary encoder whose scale pitch is 1/360 rotation (1 degree resolution), finer than 1/45000 rotation (0.008 degree) resolution has been obtained.