Piezoelectric type acceleration sensor with metallic case...

G - Physics – 01 – P

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G01P 15/09 (2006.01) G01P 1/02 (2006.01)

Patent

CA 2165376

A disc-shaped diaphragm 16 is fixed on a protruding portion 15a formed on the bottom of case 15. Piezoelectric elements 17 and 18 are bonded on upper and lower surfaces of the diaphragm 16. A printed circuit board 24 closes the opening of case 15. Outer surfaces of case 15 and printed circuit board 24 are covered by a resin package 26. Lead terminals 22 and 23 are held by a lead holding member 21. These lead terminals 22 and 23 connect the piezoelectric elements 17 and 18 with a circuit on printed circuit board 24. With this arrangement, it becomes possible to provide an acceleration sensor used in an air bag system which is capable of reducing the number of parts and simplifying the structure.

La présente invention vise un diaphragme en forme de disque (16) monté sur une section en saillie (15a) façonnée au fond du boîtier (15). Des éléments piézoélectriques (17 et 18) sont liés aux surfaces supérieure et inférieure du diaphragme (16). Une plaquette de circuits imprimés (24) obture l'ouverture du boîtier (15). Les surfaces extérieures du boîtier (15) et de la plaquette de circuits imprimés (24) sont recouvertes par un composé de résine (26). Les bornes de conducteurs (22 et 23) sont maintenues en place par un support de bornes (21) . Ces bornes (22 et 23) raccordent les éléments piézoélectriques (17 et 18) à un circuit de plaquette de circuits imprimés (24). Cette configuration permet de réaliser un capteur d'accélération monté dans un système de sac gonflable combinant les avantages d'une structure simplifiée et d'un moins grand nombre de pièces.

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