| 摘要 |
A rotation angle sensor comprises permanent magnets 4, 5 having opposite poles facing each other, and a flux density detecting unit 10 which performs relative rotation between the permanent magnets 4, 5. Opposite magnetic pole surfaces 11, 12 of the permanent magnets 4, 5 are formed in a curved shape so that the flux density between the permanent magnets 4, 5 can be suitably distributed. In this way, the resolution of the sensor can be increased without increase in cost.
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