| 摘要 |
PROBLEM TO BE SOLVED: To prevent reduction in detection accuracy of a whole photoelectric encoder by accurately detecting an optical system anomaly in the photoelectric encoder. SOLUTION: A counter part 2 counts light reception outputs A of an A-phase light receiving element 30a, light reception outputs B of a B-phase light receiving element 30b, and light reception outputs Z of a Z-phase light receiving element 30z. A predetermined number of the light reception outputs A and B to be generated by the A-phase light receiving element 30a and the B-phase light receiving element 30b from the generation of one light reception output Z1 by the Z-phase light receiving element 30z to the following generation of a light reception output Z2 is set at a reference number setting part 3. When a count value by the counter part 2 is difference from a reference number set at the reference number setting part 3, an anomaly detecting part 4 detects an optical system anomaly in the A-phase light receiving element 30a or the B-phase light receiving element 30b.
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