| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piezoelectric oscillation device in which generation of splitting oscillation can be suppressed. <P>SOLUTION: In the oscillation device, i.e. an electroacoustic transducer 100, a high rigidity first piezoelectric element 123 is arranged in the center on one surface of an elastic member 122, and a low rigidity annular second piezoelectric element 124 is arranged on the outer peripheral part. The operation principle is that a vibration is generated by driving the first piezoelectric element 123 and second piezoelectric element 124 simultaneously. Since the outer peripheral part and the central part of the elastic member 122 are deformed in the phases different from each other in the splitting oscillation mode, oscillation in the central part can be suppressed by arranging the first piezoelectric element 123 having a high rigidity for the second piezoelectric element 124. Consequently, the mode of the splitting oscillation can be deformed and the sound pressure level can be increased. <P>COPYRIGHT: (C)2012,JPO&INPIT |
