| 摘要 |
A position detecting apparatus for detecting a position appointed by a position appointing magnetism generator 7. The apparatus has at least one magnetostrictive transmission medium 1 and a first coil 2 and a second coil 5 around the medium 1 in such a manner that signals are exchanged between these coils 2,5 through the intermediary of the magnetostrictive transmission medium 1. The electro-magnetic coupling coefficient of the magnetostrictive transmission medium 1 is locally changed at a selected position by the position appointing magnetism generator 7, and this position is detected through the detection of timing of change in the signal level attributable to the change of the above-mentioned coefficient. The magnetism generator 7 need not be connected to any portion of the apparatus, and yet the appointed position can be detected at a high resolution even if the position appointing magnetism generator 7 is vertically spaced considerably from the position detection range. This apparatus can be used, for example, in the detection of position of a moving object, by attaching the position appointing magnetism generator to the moving body while laying the magnetostrictive transmission medium along the path of movement of the moving body.
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