| 摘要 |
A coil part (10) comprises a primary coil (11) which is magnetically excited by an AC signal, and secondary coils (12-15) which are positioned so as to generate an inductive output by means of the primary coil. A self-excited oscillation circuit (20) comprising an inductance element and a capacitor incorporates, therein, the primary coil (11) as an inductance element for self-excited oscillation. A target part (1) is positioned in such a manner that the relative position with respect to the coil part (10) varies according to the position to be detected, and includes a magnetically responsive material in order that the inductance of the secondary coils (12-15) is varied according to the relative position. The oscillation levels of the output signals of the secondary coils (12-15) are detected, and position data for the position to be measured is obtained on the basis of these levels. |
