ACOUSTIC GENERATOR AND ACOUSTIC GENERATION DEVICE USING SAME

WIPO Patent Application WO/2013/002384

A1

[Problem] To provide an acoustic generator for which peaks and dips in frequency characteristics of sound pressure are minimized, as well as an acoustic generation device using the same. [Solution] This invention is an acoustic generator, and an acoustic generation device using the same, wherein the acoustic generator has at least a diaphragm, and a plurality of piezoelectric elements which are attached to the diaphragm so as to be mutually spaced apart and which vibrate the diaphragm. The plurality of piezoelectric elements comprise at least two types of piezoelectric elements (1, 2) of different thickness. In each of two mutually intersecting directions upon the main surface of the diaphragm, piezoelectric elements (1, 2) of different thickness are disposed. Accordingly, it is possible to achieve an acoustic generator, as well as an acoustic generation device, for which peaks and dips in frequency characteristics of sound pressure are minimized.

JP3714303	ULTRASONIC WAVE TRANSMITTER-RECEIVER, ITS MANUFACTURING METHOD, AND ULTRASONIC WAVE FLOWMETER USING THE SAME
JPH0715798	PIEZOELECTRIC ELECTROACOUSTIC TRANSDUCER
JPS60148299	PIEZOELECTRIC SPEAKER WITH MECHANICAL COUPLING TRANSFORMER

HUKUOKA SHUICHI (JP)
KUSHIMA NORIYUKI (JP)
NINOMIYA HIROSHI (JP)
HIRAYAMA TAKESHI (JP)
YAMAKAWA KENJI (JP)

PCT/JP2012/066754

January 03, 2013

June 29, 2012

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KYOCERA CORP (JP)
HUKUOKA SHUICHI (JP)
KUSHIMA NORIYUKI (JP)
NINOMIYA HIROSHI (JP)
HIRAYAMA TAKESHI (JP)
YAMAKAWA KENJI (JP)

H04R17/00; H04R1/26; H04R7/04

WO2007060768A1

2007-05-31

JPS54109825A	1979-08-28
JPH03216099A	1991-09-24
JPS57176799U	1982-11-09
JP2003134593A	2003-05-09
JP2004023436A	2004-01-22

See also references of EP 2728903A4

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