Motion Detector

Abstract

A detector that is downsized by efficiently applying a high-period alternating magnetic field to a magnetic wire by use of a plurality of magnetic-field generation sources is provided. A detector 100 includes: a rotating body 110 having six magnetic-field generation sources 112; and a single power generation sensor 120. The six magnetic-field generation sources are disposed at equal distances from a rotational axis of the rotating body and at even intervals along a circumferential direction of the rotating body, orientations of magnetic fields of two of the magnetic-field generation sources adjacent to each other in the circumferential direction of the rotating body are different from each other, the power generation sensor includes: a magnetic wire 121 in which a large Barkhausen jump occurs; and a coil 122 wound around the magnetic wire, the magnetic wire is disposed on a straight line orthogonal to the rotational axis of the rotating body, and a central position 121a of the magnetic wire is on the rotational axis of the rotating body.

Dependencies are inferred from the claim text.