Piezoelectric electro-acoustic transducer

Details Piezoelectric electro-acoustic transducer Piezoelectric electro-acoustic transducer

2005-11-15

2005-11-15

Le, Huyen (Department: 2646)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

C381S173000, C310S348000

Reexamination Certificate

active

06965680

ABSTRACT:
A piezoelectric electro-acoustic transducer includes a piezoelectric vibration plate having a plurality of piezoelectric ceramic layers laminated to each other with an internal electrode being interposed between the ceramic layers, and main surface electrodes provided on the front and back surfaces thereof, whereby area bending vibration is produced by applying an AC signal between the main surface electrodes and the internal electrode, respectively, a resin film having a size that is greater than the piezoelectric vibration plate and having the piezoelectric vibration plate bonded substantially to the central portion of the surface thereof, and a casing which accommodates the piezoelectric vibration plate and the resin film. The piezoelectric vibration plate has an area of about 40% to about 70% of that of the resin film. The inner peripheral surface of the case is provided with a supporting portion having a frame shape that is larger than that of the piezoelectric vibration plate, and the outer peripheral portion of the resin film having no piezoelectric vibration plate bonded thereto is supported by the supporting portion of the case.

REFERENCES:
patent: 6472798 (2002-10-01), Kishimoto
patent: 6570299 (2003-05-01), Takeshima et al.
patent: 6653762 (2003-11-01), Takeshima
patent: 61-161100 (1986-07-01), None
patent: 3-175800 (1991-07-01), None

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