| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker capable of precisely controlling vibrations of the speaker. SOLUTION: The speaker 1 includes a magnet 19, a bobbin 13 which is disposed at the center portion of the magnet 19 and wound with a voice coil 17, and a piezoelectric film 23 which has one end joined to a side portion of the bobbin 14 and the other end fixed to a piezoelectric film support member 21. The speaker 1 vibrates the bobbin 14 by force operating between a current flowing to the voice coil 17 and the magnet 19 and also controls vibrations of the bobbin 14 based upon a voltage developed by changing the shape of the piezoelectric film 23 by moving the one end of the piezoelectric film 23 by vibrations of the bobbin 14. COPYRIGHT: (C)2009,JPO&INPIT
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