| 摘要 |
A driving device (14) of an acoustic diaphragm (11) is provided between a loudspeaker frame (10) and the diaphragm (11). The device (14) is composed of a pair of piezoelectric vibrating plates (1 and 2) facing to each other at an interval and the edges of the plates (1 and 2) are coupled with each other. When a driving signal is impressed upon the plates (1 and 2) the plates (1 and 2) repeat such bending motions that their central parts are alternately bent in the opposite directions and, therefore, the bending directions of the plates (1 and 2) always are opposite to each other.
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