Piezoelectric speaker

Details Piezoelectric speaker Piezoelectric speaker

2005-01-04

2005-01-04

Kuntz, Curtis (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

C381S398000, C381S430000, C181S171000, C181S173000

Reexamination Certificate

active

06839445

ABSTRACT:
A piezoelectric speaker includes a piezoelectric vibrator and a metal reflection plate. The piezoelectric vibrator includes a piezoelectric element which has a dome shape with a hollow portion and which is polarized in the thickness direction, a first electrode disposed on the inner surface of the piezoelectric element, a second electrode disposed on the outer surface of the piezoelectric element. The piezoelectric vibrator further includes a hole provided in the top thereof. The reflection plate is arranged to cover the hollow portion of the piezoelectric vibrator.

REFERENCES:
patent: 6563930 (2003-05-01), Nakamura et al.

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