Patent ID: 6984975

Claim:
A displacement sensor having a configuration in which an output changes corresponding to a change in the relative position to an object to be detected and which detects a proximity position in relation to said object to be detected based on the change in said output, said displacement sensor comprising: a core body including a core center portion and first and second core end portions that are continuously formed on both sides of the core center portion; one or more magnetizing coils and one or more detecting coils wound around said core body such that they are lined on the axis of said core body; one of said magnetizing coils and said detecting coils being placed at said core center portion at the approximate center of said core body in the axial direction, the other of said magnetizing coils and said detecting coils being placed at a pair of said core end portions of said core body in the axial direction; and the axial direction of said core body being arranged to be approximately equal to the direction of a change in the relative position in relation to said object to be detected such that one of said core end portions and said object to be detected face each other when said object to be detected approaches and retreats from said core end portion; wherein the width of said pair of said core end portions in the direction perpendicular to the axial direction is substantially the same and is smaller than the width of the core center portion.