| 摘要 |
PCT No. PCT/US92/07435 Sec. 371 Date Jun. 20, 1994 Sec. 102(e) Date Jun. 20, 1994 PCT Filed Aug. 28, 1992 PCT Pub. No. WO94/05964 PCT Pub. Date Mar. 17, 1994A transducer for indicating position in space with reference to a coordinate system includes a magnetic field source (13), a movable button element (11) composed of a magnetically susceptible material having a central pole face (16) and a surrounding annular co-planer pole face (19) for providing uniform magnetic flux paths in the annular region between and extending from the plane of the respective pole faces, and a probe element having a plurality of sensor units (41a-d) for electronically measuring magnetic flux through a plurality of separate, geometrically congruent areas arranged around an axis of symmetry (24) in a sensing plane which is spaced from, and parallel to that of the pole faces of the movable button element. The relative position of the button element in a plane perpendicular to the axis of symmetry is determined by electronically adding and subtracting the different measurements of magnetic flux through the respective areas, while the relative proximity of the sensing plane of the probe element to the pole face plane of the button element is determined from total magnetic flux measured by all of the sensors.
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