Piezoelectric energy source
First Claim
1. A piezoelectric energy source comprising a housing, a piezoelectric transducer arranged within said housing, piston means mounted for movement within said housing for exerting pressue on said piezoelectric transducer in accordance with the extent of the path of movement thereof from an initial rest position, and means for nondisengagingly locking said piston means in a predetermined position along the path of movement of said piston means corresponding to a predetermined pressure on said piezoelectric transducer, said piezoelectric transducer providing an output in accordance with the pressure exerted thereon, and said housing forms a portion of a capacitor for storing the output of said piezoelectric transducer.
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Accused Products
Abstract
A piezoelectric energy source having a piezoelectric transducer mounted in a housing and a movable piston arranged in the housing to bias the transducer to provide a desired electrical output. The piston exerts pressure on the transducer in response to a pyrotechnic charge and is locked in a predetermined biasing position by a locking arrangement such that a constantly effective pressure is exerted on the transducer.
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Citations
16 Claims
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1. A piezoelectric energy source comprising a housing, a piezoelectric transducer arranged within said housing, piston means mounted for movement within said housing for exerting pressue on said piezoelectric transducer in accordance with the extent of the path of movement thereof from an initial rest position, and means for nondisengagingly locking said piston means in a predetermined position along the path of movement of said piston means corresponding to a predetermined pressure on said piezoelectric transducer, said piezoelectric transducer providing an output in accordance with the pressure exerted thereon, and said housing forms a portion of a capacitor for storing the output of said piezoelectric transducer.
- 2. A piezoelectric energy source comprising a housing, a piezoelectric transducer arranged within said housing, piston means mounted for movement within said housing for exerting pressure on said piezoelectric transducer in accordance with the extent of the path of movement thereof from an initial rest position, means for locking said piston means in a predetermined position along the path of movement corresponding to a predetermined pressure, and a pyrotechnic propellant charge provided within said housing serving as a pressure source for causing movement of said piston means toward said piezoelectric transducer.
- 3. A piezoelectric energy source comprising a housing, a piezoelectric transducer arranged within said housing, piston means mounted for movement within said housing for exerting pressure on said piezoelectric transducer in accordance with the extent of the path of movement thereof from an initial rest position, and means for locking said piston means in a predetermined position along the path of movement corresponding to a predetermined pressure, said locking means including a groove arranged in the circumferential surface of said piston means and a spring ring arranged in said groove.
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7. A piezoelectric energy source comprising a housing, a piezoelectric transducer arranged within said housing, piston means mounted for movement within said housing for exerting pressure on said piezoelectric transducer in accordance with the extent of the path of movement thereof from an initial rest position, and means for locking said piston means in a predetermined position along the path of movement corresponding to a predetermined pressure, said piston means including a cup spring and a piston, said cup spring positioning said piston within said housing.
- 15. A piezoelectric energy source comprising a housing, a piezoelectric transducer arranged within said housing, piston means mounted for movement within said housing for exerting pressure on said piezoelectric transducer in accordance with the extent of the path of movement thereof from an initial rest position, and means for nondisengagingly locking said piston means in a predetermined position along the path of movement of said piston means corresponding to a predetermined pressure on said piezoelectric transducer, said piston means including a piston member mounted within said housing for movement therein and said locking means directly engages said piston member for nondisengagingly locking said piston member in a predetermined position along the path of movement thereof.
Specification