| 摘要 |
PROBLEM TO BE SOLVED: To obtain an output sound source from which large acoustic power is obtained regardless of its small size. SOLUTION: A support plate 3 supports an actuator 2 in an enclosure 4. The actuator 2 generates vibration. The vibration of the actuator 2 vibrates a diaphragm 1. The diaphragm 1 that is vibrated propagates a sound wave in front of the diaphragm 1 and in the inside of the enclosure 4. A length L of the enclosure 4 is decided so that an anti-resonance frequency of the enclosure 4 is in matching with a frequency desired of enhancing an electroacoustic transduction efficiency. An acoustic impedance at the frequency in the enclosure 4 is much increased to enhance the electroacoustic transduction efficiency.
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