| 摘要 |
PURPOSE:To make it possible to detect displacement with high reliability, by connecting no lead wire to a movable electrode and making said electrode movable corresponding to the displacement of an object to be detected without applying load thereto and taking out output by generating induced output to a fixing side. CONSTITUTION:Fixed electrodes 11, 12 are formed to the outer peripheral surface of a glass tube 13 so as to provide an interval therebetween and cylindrical vapor deposition layers are formed to both sides thereof in the same length. An endless strip like vapor deposition layer is formed within said interval and functions s an output conductive film 14. A movable electrode is a piston 21 and the length thereof extends from the leading end of the conductive film 11 to the leading end of the conductive film 12 and the piston 21 is made freely slidable along the inner peripheral surface of the glass tube 13. An AC signal having 180 deg. phase difference is supplied to each of the conductive films 11, 12 from an AC power source 40 and, when the piston 21 displaces in the glass tube 13 by said signal, the output eo corresponding to the displacement of the piston 21 is generated in the piston 21 and led out from the output conductive film 14 by a lead wire through a condenser 54 having constant capacity.
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