| 摘要 |
PROBLEM TO BE SOLVED: To provide a bone conduction speaker which is small-sized and can be excellently mass-produced, by attaining large output that is required for bone conduction, while preventing the increase in sound leak when it is incorporated in equipment by using a unimorph-type or bimorph-type piezoelectric element. SOLUTION: A bimorph-type piezoelectric element 1 in a rectangular plane shape is used and this is made into a both-ends supported structure with a reduced energy loss. At the same time, the mass of a base part constituted of a base weight 5 and a frame 3 is made large, and rigidity in the thickness direction of the piezoelectric element in a supporting part including insulated supporting members 2a, 2b is made high, but rigidity in the longitudinal direction of the piezoelectric element is made low. Consequently, vibration of the base part in the equipment is reduced, thereby reducing a phenomenon that vibration is conducted to the equipment and increases sound leakage. COPYRIGHT: (C)2008,JPO&INPIT
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