DISPLACEMENT SENSOR

PROBLEM TO BE SOLVED: To heighten the effective length ratio, and to improve durability, in a displacement sensor for detecting the displacement of a movable body to be displaced by an inductor sliding on an exciting coil wound around a magnetic core. SOLUTION: The magnetic core 11 and the exciting coil 13 are stored in a non-magnetic protection tube 13, and the inductor 14 is arranged slidably on the protection tube surface. One end of the inductor is fixed on a winding start position of the exciting coil, and the other end of the inductor is bonded to the movable body to be displaced. The inductor has a plurality of ring washers 15 inserted into the protection tube, and spring members 16 whose radial direction ends are fixed on the radial direction ends of the washers and extended in the axial direction of the protection tube. The spring members are provided plurally at equal angle intervals relative to the center axis of the protection tube, and when the inductor is displaced, the inductor washers are kept in the mutually parallel state, and the intervals thereof are kept equal. COPYRIGHT: (C)2006,JPO&NCIPI