Ultrasonic transducer and ultrasonic speaker using the same

Details Ultrasonic transducer and ultrasonic speaker using the same Ultrasonic transducer and ultrasonic speaker using the same

2005-04-07

2011-10-25

Goins, Davetta (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

C381S150000, C381S174000

Reexamination Certificate

active

08045735

ABSTRACT:
An ultrasonic transducer includes: a pair of fixed electrodes including a conductive member; a vibrating film having a conductive layer; and a member which holds the pair of fixed electrodes and the vibrating film. The vibrating film is formed of nonconductive bodies and has an electrode layer formed of a conductive material. The electrode layer is applied with a DC bias voltage of a single polarity by a DC bias supply, and is also applied with an AC signal output from a signal source superimposed on the DC bias voltage. The pair of fixed electrodes have a plurality of holes of the same number at positions facing each other via the vibrating film, and an AC signal is applied between the conductive members of the pair of fixed electrodes by the signal source.

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International Search Report and Written Opinion of the International Searching Authority (in English) for PCT/JP2005/007199, ISA/JP, Tokyo, mailed Aug. 2, 2005.

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