| 摘要 |
There is provided a rotary encoder which can eliminate an angle error caused by an eccentricity from a measured angle without strictly adjusting hardware and which can also eliminate a graduation error. Detection of a rotation angle of the rotating section and measurement of an error E (theta<SUB>n</SUB>) included in the detected angle theta are performed in advance, an error function E(theta) represented by a periodic function of the detected angle theta is calculated on the basis of these values, a storing means for storing the periodic function of the calculated error E(theta) is arranged, and an angle obtained by subtracting a value obtained by substituting the detected angle thetaa for variables in the error function E(theta) from the detected angle thetaa is displayed on a display unit.
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