Mitsubishi Electric Corporation

Youichi Omura

Hajime Nakajima

Takashi Iwamoto

Takeshi Musha

Takuya Noguchi

Tatsuya Nagatani

Toshiro Nakashima

Present invention provides an optical encoder capable of improving the precision of an interpolation angle in a single signal track, in an encoder of sine-wave angle interpolation type. The optical encoder includes a waveform, in which a phase-modulated wave is superimposed in a predetermined period over a sine-wave of a fundamental period, as a signal track (), and an optical detector () for extracting the sine signal and the cosine signal of the phase-modulated wave. An operation unit () operates electric angles individually from the output signals of a first optical detector pair and a second optical detector pair belonging to the optical detector, and determines the sum and difference of the electric angles, thereby acquiring the electric angle and the phase-modulated wave of the fundamental period.

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Tokyo, Japan

Youichi Omura