Patent ID: 7012422
Filing Date: 2006-03-14
Classification: G01D

Abstract:
1. A non-contact type position sensor comprising: (a) a first magnetic element having a first magnetic detecting part at one end side thereof, (b) a first magnet having one pole fixed at an other end side of the first magnetic element, (c) a second magnetic element positioned underneath the first magnetic element, having a second magnetic detecting part at one end side thereof, and having an other pole than the one pole of the first magnet at an other end side thereof, (d) a third magnetic element positioned substantially on circles concentric with the first magnetic element, and having a third magnetic detecting part at one end side thereof, (e) a second magnet having a pole of opposite polarity to polarity of the one pole of the first magnet, fixed at an other end side of the third magnetic element, (f) a fourth magnetic element positioned underneath the third magnetic element, having a fourth magnetic detecting part at one end side thereof, and having an other pole than the pole of the second magnet at an other end side thereof, and (g) a magnetic detecting element positioned such that the first and second magnetic detecting parts are on one side of said magnetic detecting element and the third and fourth magnetic detecting parts are on the other side of said magnetic detecting element.