| 摘要 |
An encoder includes an encoder scale having an optical pattern of a prescribed cycle, and an encoder head configured to be displaced relative to the encoder scale. The encoder head includes a reference voltage generating circuit and a changing unit. The reference voltage generating circuit is configured to generate a reference voltage set to the center amplitude of an encoder signal when the output of the encoder is an encoder signal having periodicity of at least one phase. The changing unit is configured to change the reference voltage generated in the reference voltage generating circuit.
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