| 摘要 |
The device ( 1 ) comprises a frame ( 42 ) comprising a static magnetic pole ( 48 ), a movable member ( 44 ) relatively to the frame ( 42 ), the movable member ( 44 ) comprising a moving magnetic pole ( 46 ), the static magnetic pole ( 48 ) and the moving magnetic pole ( 46 ) being magnetically coupled in some position of the movable member ( 44 ), a piezosensitive element ( 50 ) so that the force due to the magnetic coupling between the moving magnetic pole ( 46 ) and the static magnetic pole ( 48 ) reacts on the piezosensitive element ( 50 ), and means ( 52, 54, 56, 58 ) for outputting an electric signal from the piezosensitive element ( 50 ), the signal being useful in determining the position and/or the speed and/or the direction of the movable member ( 44 ).
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