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JPS5811399

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DESCRIPTION JPS5811399
[0001]
Brief description of the drawings
[0002]
FIG. 1 is a sectional view showing the prior art, FIG. 2 is a plan view showing another prior art,
FIG. 3 is a sectional view showing one embodiment of the present invention, FIG. 4 is a plan view
thereof, FIG. 6 is a graph showing the comparison result between the prior art and the present
invention, and FIG. 6 and FIGS. 7A and 7B are cross sectional views respectively showing another
embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... internal pole, 2 ... ferrite
magnet, 3 ... yoke, 4 ... coil, 6 ... main diaphragm, 8 ... auxiliary diaphragm.
11-05-2019
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