Importance

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Abstract

An encoder system includes a supporting member including a plurality of marks, first and second sensors provided to be shifted from each other by a first distance and capable of reading the marks, and a calculation processing unit that performs a calculation processing of detected signals of the first and second sensors, and the calculation processing unit calculates a first time that is required for one mark to move the first distance and a second time that is required for two adjacent marks to pass a detection position of the first or second sensor while the supporting member moves relatively to the first and second sensors, and determines that a mark pattern used to calculate a first index is an origin mark pattern when the first index calculated based on the first and second times corresponds to a second index that characterizes an origin position.

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First Claim