Importance

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Abstract

[Problems to be Solved] To provide a rotary encoder capable of carrying out self-calibration for a horizontal encoder as well as a vertical encoder without requiring special equipment and simply and inexpensively with a high degree of accuracy while reducing the burden on a worker.) that reads the angle code; and a processing unit that acquires a reading value f(θ) based on the angle code read by the CCD linear sensor, every time the rotary disk is rotated by a predetermined angle, where a rotation angle of the rotary disk is provided as θ and an angle from the rotation angle θ is provided as φ, based on a change in a difference g(θ,φ) between reading values f(θ+φ) and f(θ) within a reading range on the CCD linear sensor, the difference g(θ,φ) is determined as a Fourier series, and self-calibration of the reading value f(θ) of 0 to 360° is carried out based on the result.

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First Claim