NON-CONTACT DISPLACEMENT SENSOR AND NON-CONTACT DISPLACEMENT DETECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To reduce detection error.;SOLUTION: A magnetic core 2 includes: a main part 20; and a pair of arms 21 extending from both ends of the main portion 20 in a longitudinal direction, which are integrally formed of a magnetic material such as ferrite. In a magnetic gap of the magnetic core 2, a magnetic flux goes parallel to a direction of the gap. The width dimension of the detection object 1 in a Y-axial direction is smaller than the length dimension of the arm 21 in the Y-axial direction, and the detection object 1 and the magnetic core 2 are disposed so that a space d1 and a space d2 are left respectively between both ends of the detection object 1 and both ends of the arms 212. Therefore, even when the relative position between the detection object 1 and the magnetic core 2 changes in a range from -d1 to +d2 along the Y-axial direction, since the area of the detection object 1 crossing the magnetic field in the magnetic gap does not change, the detection accuracy can be prevented from reducing.;COPYRIGHT: (C)2014,JPO&INPIT