| 摘要 |
PROBLEM TO BE SOLVED: To obtain an inductive measuring apparatus which enhances the measuring accuracy of a position by forming a precise coil shape by a method wherein a primary coil and a secondary coil are wound to be a rectangular shape, thier longitudinal axis is arranged in the transverse direction with reference to a metal strip and both coils are printed on a printed-circuit board so as to be arranged. SOLUTION: Primary coils 2, 2' and secondary coils 3, 3' are formed at both ends of a metal strip 1. The primary coils 2, 2' are arranged under both ends of the strip 1, and the secondary coils 3, 3' are arranged on both ends of the strip 1 so as to face the primary coils 2, 2' in such a way that they form a coreless transformer. The coils 2, 2', 3, 3' are formed in such a way that, e.g. they are a slender rectangular shape, that their longitudinal axis is at an angle of 90 deg. with reference to both ends of the strip 1 and that they are symmetric with reference to the center of the strip 1. It is preferable that the primary coils 2, 2' are operated at a high operating frequency of at least 10 kHz. In addition, it is preferable to use a printed-circuit board on which the coils 2, 2', 3, 3' are aligned precisely with each other so as to be printed on both sides.
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