Patent attributes
To provide a position detection apparatus with an expanded range of good linearity in a magnetic sensor's output characteristic with respect to position of a movable body as well as to provide a vehicle mirror angle detection apparatus using the position detection apparatus. Two permanent magnets 42 and 44 and one Hall-effect sensor 46 are used. The permanent magnets 42 and 44 are arranged with their relative position fixed. The Hall-effect sensor 46 is placed laterally to the arrangement of the two permanent magnets 42 and 44. The permanent magnets 42 and 44 and Hall-effect sensor 46 move relative to each other in a direction parallel to the arranging direction of the permanent magnets 42 and 44. Those surfaces 42a and 44a of the permanent magnets 42 and 44 which face the Hall-effect sensor 46 constitute magnetic pole faces of opposite polarity and the magnetic pole faces 42a and 44a are placed with an inward tilt. A magnetic sensing direction F of the Hall-effect sensor 46 is set orthogonally to the arranging direction of the permanent magnets 42 and 44.
