ELECTROSTATIC TYPE ULTRASONIC TRANSDUCER AND ULTRASONIC SPEAKER USING THE SAME, METHOD OF REPRODUCING SOUND SIGNAL, SUPER-DIRECTIVITY SOUND SYSTEM, AND DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an electrostatic type ultrasonic transducer, where voltage to be applied between electrodes is low as compared with before and high sound pressure can be obtained.;SOLUTION: There are provided: a first electrode 10A having a through hole 14; a second electrode 10B having a through hole paired with that of the first electrode; and a vibrating membrane 12 that is sandwiched between a pair of electrodes comprising the first and second electrodes, has a plurality of electrode layers 121, and applies a DC bias voltage to the electrode layer. In this case, an AC signal is applied between the pair of electrodes and the electrode layer of the vibrating membrane.;COPYRIGHT: (C)2008,JPO&INPIT