Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electrostrictive – magnetostrictive – or piezoelectric
Reexamination Certificate
2005-07-05
2005-07-05
Le, Huyen D. (Department: 2643)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electrostrictive, magnetostrictive, or piezoelectric
C381S173000, C381S423000, C381S353000
Reexamination Certificate
active
06914993
ABSTRACT:
A piezoelectric film loudspeaker comprising a diaphragm having a flexible piezoelectric film and electrodes formed on the both surfaces of the flexible piezoelectric film and a frame for supporting a side of the diaphragm, wherein said respective electrodes disposed on the both surfaces are divided into a plurality of sections. Each area of the divided electrodes is formed differently from one another, and each curvature of the film in the divided section also is formed differently from one another. Thus, the piezoelectric film loudspeaker having a predetermined area can have a broad band.
REFERENCES:
patent: 4056742 (1977-11-01), Tibbetts
patent: 4985926 (1991-01-01), Foster
patent: 6111967 (2000-08-01), Face, Jr. et al.
Le Huyen D.
Pioneer Corporation
Tohoku Pioneer Corporation
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