Abstract: A piezoelectric sounding element includes a diaphragm made of metal and a piezoelectric element provided on at least one surface of the diaphragm. A non-fixed portion of the diaphragm includes the pair of long sides facing each other, a pair of short sides, shorter than the long sides, that face each other, and a pair of recesses, provided in the pair of long sides, that protrude so as to approach each other. The piezoelectric element is provided in a region between the pair of recesses of the diaphragm and the contour shapes of the non-fixed portion of the diaphragm and the piezoelectric element are defined so as to be symmetric with respect to a first imaginary line that bisects the pair of short sides and symmetric with respect to a second imaginary line that bisects the pair of long sides.
Type:
Grant
Filed:
March 29, 2018
Date of Patent:
December 1, 2020
Assignees:
HOKURIKU ELECTRIC INDUSTRY CO., LTD., DENSO ELECTRONICS CORPORATION
Inventors:
Masahide Tamura, Tadao Sunahara, Koji Hamada, Ryuta Suzuki