| 摘要 |
PROBLEM TO BE SOLVED: To obtain sufficient sound pressure in a compact structure. SOLUTION: A transducer includes a permanent magnet plate 2 having N and S poles bonded on the plate alternately into a strip shape as a bond magnet, and a vibration film 4 on which electrical wires 41 extended along boundary regions between the N and S poles are formed in a space in a casing CA sandwiching a buffer plate 5B with the permanent magnet plate 2. The permanent magnet plate 2 is provided only at one side of the vibration film 4. The buffer plates 5A and 5B are shaped into frames extended along the peripheral edge 43 of the film 4 and provided on both surface of the peripheral edge 43. COPYRIGHT: (C)2004,JPO
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