| 摘要 |
PROBLEM TO BE SOLVED: To provide a noncontact displacement detection system which can detect rotational displacement of up to nearly 360°and be configured to be compact and inexpensively. SOLUTION: The noncontact displacement detection system comprises a coil 34, a shaft 31, and a pair of conductive members 32, 33 which are integral with the shaft 31 and change their area facing the coil 34 accompanied by the rotation of the shaft 31. The conductive members 32, 33 have a plate-like shape of which the plate face is perpendicular to the axis of the shaft 31, have an outline consisting of a spiral with the axis as the center and a line connecting its beginning and termination in the radial direction, and are arranged with a predetermined spacing S in the axial direction so that their outlines coincide with each other viewed from the axial direction. The coil 34 has a long, narrow opening shape of which the longitudinal direction is set to be the radial direction and is arranged in the center of the spacing S in the axial direction so that the spiral and the opening face each other. A change in the inductance of the coil 34 caused by a change in the facing area is extracted as an electrical signal. COPYRIGHT: (C)2007,JPO&INPIT
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