| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrostatic ultrasonic transducer having low power consumption, which requires a lower voltage to be applied between electrodes than in a conventional transducer and obtain a high sound pressure. SOLUTION: The transducer has: a first electrode 10A having a through-hole 14; a second electrode 10B having a through-hole paired with the through-hole of the first electrode; and a vibration film 12 sandwiched by the pair of electrodes including the first electrode and the second electrode, having an electrode layer 121 and allowing a DC bias voltage to be applied to the electrode layer, wherein an electrode layer 101 is formed on the peripheral portion of the through-holes of the pair of electrodes and an AC signal is applied between the pair of electrodes and the electrode of the vibration film. COPYRIGHT: (C)2009,JPO&INPIT
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