| 摘要 |
931,807. Hall-effect transducers. SIEMENSSCHUCKERTWERKE A.G. Aug. 27, 1959 [April 23, 1959; July 14, 1959], No. 29331/59. Class 40 (4). An electro-mechanical transducer comprises a Hall-effect plate sandwiched between pieces of soft-iron or ferrite the flux through which is varied by a permanent magnet with one pole nearer to the Hall plate than the other and moved perpendicularly to the plate in accordance with mechanical vibrations. As embodied in the pick-up in Fig. 1 the plate 11, which may be a vapour deposited film, lies between ferrite blocks 12, 13, and the magnet 14 is pivoted at 18 on a stylus arm 17 carrying a sapphire stylus 20. The stylus arm is centred by a spring system 21, 22. In the embodiment of Fig. 4 the stylus arm 48 pivots about the axis of a rod-shaped magnet 45 magnetized across a diameter and oriented to give a flux balancing in the arms 43 and 44 of the ferrite sandwich. In a microphone, Fig. 3, not shown, the magnet may be driven by a diaphragm. It is stated that by using two Hall-effect transducers a push-pull or stereophonic output may be generated.
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