Importance

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Abstract

An electrostatic capacity type encoder which includes a rotary disk rotatingly provided on an encoder body, and a first stationary disk and a second stationary disk fixed to the encoder body to face each other with the rotary disk arranged therebetween. A plurality of transmitting electrodes are provided on the first stationary disk. On the rotary disk is provided not only a plurality of receiving electrodes facing the transmitting electrodes on the first stationary disk but also a coupling electrode connected to the receiving electrodes and facing the second stationary disk. An output electrode is provided on the second stationary disk to face the coupling electrode on the rotary disk. To the respective transmitting electrodes are applied alternating currents with respective different phases, and the amount of rotating displacement in the rotary disk is detected in accordance with the output signal from the output electrode which changes with the rotation of the rotary disk.

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First Claim