| 摘要 |
An encoder system (100) includes a supporting member (11) including a plurality of marks, first and second sensors (12, 13) provided to be shifted by a first distance from each other and capable of reading the marks, and a calculation processing unit (14) 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 characterizing an origin position. |
