Patent ID: 9733058
Date: 2017-08-15
CPC Classifications: G01B,G01D,H03K

Claim:
1. A proximity sensor comprising: a single permanent magnet having the form of a rectangular parallelepiped having N and S poles at pole faces which are a pair of opposite faces and are parallel to each other; a first yoke that is held in an intermediate position between two magnetic pole faces of the permanent magnet and includes a projecting portion projecting from a wall face of the permanent magnet vertical to the magnetic pole face; a second yoke that includes a main body portion in parallel with the wall face of the permanent magnet from which the projecting portion projects and is arranged to have a space to the projection portion; and a magnetic responsive element that is arranged in the space between the projecting portion and the second yoke, wherein the permanent magnet is arranged to position the magnetic pole face to be in parallel with the detected member moving relative thereto; wherein the permanent magnet defines a holding hole in a center of the permanent magnet and penetrating the magnet from a top face to a bottom face in parallel with the pole faces, the first yoke being held in the intermediate position in the holding hole.