| 摘要 |
A rotation angle detection device comprises a rotor (120) attached to a measurable rotation body (Sh) for rotating with the measurable rotation body to be measured a rotation angle, and comprising a magnet (110) that a magnetic flux density around the measurable rotation body is changed thereby in response to the rotation angle of the measurable rotation body; a stator (130) to be attached as independent of the rotation of the measurable rotation body; a detection element ((150) (151-154)) fixed on the stator for detecting a change in magnetic flux density due to the magnet in response to the rotation of the measurable rotation body; and a case for packing the rotor, the stator and the detection element. By detecting the rotation angle of the measurable rotation body in response to a detection signal from the detection element according to the rotation of the measurable rotation body, it becomes able to provide a rotation angle detection device comprising less number of components, to be small sized, to be easily assembled, and having excellent detection characteristics.
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