Rotation angle detector e.g. throttle-opening sensor has pair of reverse curvature portions provided so that air gap between thin magnetic plate and yoke increases rapidly, when magnetic plate rotates to predetermined angle

摘要

A yoke (6) arranged a Hall integrated circuit (IC) (7) in gap (9) provided in magnetic circuit. A pair of reverse curvature portions (34) are provided so that the air gap between the thin magnetic plate (4) and yoke increases rapidly, when the magnetic plate rotates to predetermined angle.