| 摘要 |
PROBLEM TO BE SOLVED: To provide a ring sensor which shows an excellent weight balance and has a waterproof structure by feeding power to the ring sensor by electromagnetic induction. SOLUTION: The ring sensor achieves the elimination of an electric contact and the waterproof structure by placing the ring sensor or a device to which power is fed on a power feeding device for converting the power extracted from a power source to a magnetic flux and by the structure to feed power to the ring sensor from the power feeding device by the electromagnetic induction. Moreover, the weight balance is uniformed by placing a secondary coil and a core in positions symmetric to the center of the ring sensor. COPYRIGHT: (C)2007,JPO&INPIT
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