Patent ID: 9035645
Filing Date: 2015-05-19
Classification: G01B

Abstract:
1. A position detecting device for detecting a position of a movable member movable in a linear stroke direction comprising: a first magnetic-flux generating member and a second magnetic-flux generating member, the first and the second magnetic-flux generating members being provided on the movable member so as to oppose to each other across a virtual plane which is in parallel to the linear stroke direction and perpendicular to the movable member, the first and the second magnetic-flux generating members being arranged with respect to each other in a first direction which is perpendicular to the linear stroke direction, the first and the second magnetic-flux generating members being magnetized in a second direction which is perpendicular to both of the linear stroke direction and the first direction, and a magnetizing direction of the first magnetic-flux generating member being the same to that of the second magnetic-flux generating member; and a magnetic detecting member provided at a position more remote from the movable member than the first and the second magnetic-flux generating members in the second direction, so as to be movable relative to the movable member in the linear stroke direction, wherein the magnetic detecting member has a magnetic sensing surface arranged so as to be perpendicular to the linear stroke direction, and the magnetic detecting member outputs a signal depending on density of magnetic flux passing through the magnetic sensing surface.