| 摘要 |
PURPOSE:To make the vertical vibration symmetrical with less distortion by providing a casing to which one end of a moving coil is fixed so as to apply push- pull operation to the magnetic circuit. CONSTITUTION:Top plates 14, 24 are fixed to magnets 13, 23, a magnetic gap is formed between the plates 14, 24 and center poles 11, 21 to constitute the magnetic circuit. The moving coils 16, 26 wound on bobbins 15, 25 are placed in the magnetic gap, the bobbins 15, 25 are fixed to the casing 10 and the surrounding of each magnetic circuit is supported to the casing 10 by dampers 17, 27. Thus, the center of gravity of the vibrating system, the center of drive point and the center of support point are arranged to one point, the magnetic circuit is subject to push-pull operation even at large amplitude and the vibration cancelling distortion is reproduced. |
