ABSOLUTE ENCODER

摘要

There is provided an absolute encoder advantageous in accuracy of an output thereof against a defect in a scale thereof. In the absolute encoder, a detector detects a part of an array of marks of the scale, and outputs a data sequence corresponding to the part. A processor stores information indicating a correspondence between each of a plurality of code sequences and an absolute coordinate of motion of the scale, and outputs information of the absolute coordinate based on the data sequence and the information. The processor detects an error of the data sequence, and performs rewriting of the information based on the detected error.

主权项

1. An absolute encoder comprising:
a scale including an array of marks; a detector configured to detect a part of the array of marks and output a data sequence corresponding to the part; and a processor storing information indicating a correspondence between each of a plurality of code sequences and an absolute coordinate of motion of the scale, and output information of the absolute coordinate based on the data sequence and the information, wherein the processor is configured to detect an error of the data sequence, and perform rewriting of the information based on the detected error.