| 摘要 |
PROBLEM TO BE SOLVED: To inhibit a variation of a changing timing of an output signal of a pair of the sensors 9a, 9b, irrespective of a direction and an amount of a relative displacement of both orbital rings of static and rotation sides, to simplify a process in an operation part calculating the above direction and amount of the relative displacement, to suppress a cost up of an operation part, and to provide a structure which can shorten a period required to specify the direction and the amount of the displacement. SOLUTION: An initial phase difference is established between the output signals of the sensors 9a, 9b by changing the direction of the magnetic detection elements 10, 10 or the permanent magnets 11, 11 constituting of a pair of the sensors 9a, 9b. Further, the direction and the amount of the above displacement is determined by grasping the variation of the direction and the amount of a real phase difference as the phase difference between the output signals of the sensors 9a, 9b at this time point for the initial phase difference. COPYRIGHT: (C)2006,JPO&NCIPI
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