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US 5,856,956 AGranted
Piezoelectric acoustic transducer
AssigneeNEC Corporation
InventorNozomi Toki
Life of this patent
Estimating the term…
Abstract
The piezoelectric-acoustic transducer of the present invention has a hollow case provided with a sound hole. A piezoelectric actuator is disposed inside this case that has one end fixed to the case and that bends in the direction of the thickness of the case when voltage is applied. A diaphragm is secured to one portion of the piezoelectric actuator and is positioned at a distance from the piezoelectric acturator in the direction of the thickness of the case.
Claims6
A piezoelectric-acoustic transducer comprising:
- a hollow case provided with a sound-hole;
- a piezoelectric actuator that is arranged inside said case having one end secured to said case, and that bends in the direction of the thickness of said case when voltage is applied, wherein the length of said piezoelectric actuator is substantially equal to the inner diameter of said case;
- and
- a diaphragm that is disposed at a distance from said piezoelectric actuator in the direction of thickness of said case and one portion of the periphery of said diaphragm is secured to one part of said piezoelectric actuator.
1 more element
A piezoelectric-acoustic transducer comprising:
- a hollow case provided with a sound-hole;
- two piezoelectric actuators that bend in the direction of the thickness of said case when voltage is applied, each having at least one end secured to said case and each being arranged inside said case parallel to and at a distance from the other in the direction of the thickness of said case, wherein the length of each of said piezoelectric actuators is substantially equal to the inner diameter of said case;
- a linking member that links one part of each of said piezoelectric actuators, wherein said linking member links the other ends of said piezoelectric actuators together;
- and
- a diaphragm that is arranged at a distance from each of said piezoelectric actuators in the direction of the thickness of said case and that is secured at one part with said linking member, wherein one part of the periphery of said diaphragm is secured to said linking member.
2 more elements
Dependencies are inferred from the claim text.