Electrosonic energy transducer

Application Number: 00102643
Application Date: 2000.02.22
Publication Number: 1265001
Publication Date: 2000.08.30
Priority Information: 1999/10/15 JP 293205/99; 1999/2/22 JP 42587/99
International: H04R17/00
Applicant(s) Name: Murata Mfg. Co., Ltd.
Inventor(s) Name: Kishimoto Kenji;Takashima Tetsuo
Patent Agency Code: 31100
Patent Agent: chen liang
Abstract The invention provides an electroacoustic transducer which includes a diaphragm including a substantially rectangular metal plate and a substantially rectangular piezoelectric plate having electrodes on an upper surface and a lower surface thereof, with one of the electrodes being connected to the metal plate. A support medium including retaining parts for retaining two shorter sides of the diaphragm is provided. The shorter sides of the diaphragm are fixed to the retaining parts by an adhesive having a Young's Modulus after curing that is between about 4.0×10<4> N/m<2> and about 5.0×10<6> N/m<2>. Gaps between the two longer sides of the diaphragm and the support member are sealed by an elastic sealant. The diaphragm is arranged to undergo bending vibration in a longitudinal bending mode by applying a predetermined electrical signal between the metal plate and the opposing electrode provided on the piezoelectric plate.