Prestressed piezoelectric accelerometer
OwnerJean Cartierinventor
Life of this patent
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Abstract
Accelerometer of the spring-mass type comprising, in a housing, a balanced vibrating mass, a spring constituted by at least one hollow piezoelectric element situated between the mass and the housing, as well as a fastening element traversing the mass and secured to the housing. In addition, a prestressing element situated between the fastening element and a recess provided in the mass urges the latter towards the housing. The piezoelectric element surrounding the mass is then compressed. The point of application of the prestressing force and the center of gravity of the mass are in the same median plane of the piezoelectric spring, which plane is transversal and perpendicular to the axis of the housing.
Claims12
An accelorometer device of the springmass type comprising, in a housing having an axis, a hollowed vibrating mass having a recess and being statically and dynamically balanced;
- spring means including hollow piezoelectric means interposed between the mass and the housing, and a fastening element mounted in the housing;
- and elastic prestressing means situated in the recess of the vibrating mass between a shoulder of said mass and the fastening element, and wherein the position of the prestressing means with respect to the mass is such that the point of application of the prestressing force and the center of gravity determined by the static and dynamic balancing of the vibrating mass are situated in the same median plane of the piezoelectric means, which plane is transverse and perpendicular to the axis of the housing.
Dependencies are inferred from the claim text.