Low voltage bender piezo-actuators
AssigneeNoise Cancellation Technologies, Inc.
InventorStephen Hildebrand
Life of this patent
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Abstract
A low voltage bender piezo-actuator with multiple, same size piezo layers (11, 12) separated by thin electrically conductive strips (14) and adapted to be affixed to a rigid, vibration transmitting plate (10) to produce noise counter vibrations to prevent noise from passing through the plate.
Claims13
In an enclosure comprising rigid walls having a given thickness and size, the walls being prone to transmit noise from within the enclosure by vibration, the improvement comprising
- at least one layered piezoelectric means affixed to the approximate center of the half-structural wavelength to be controlled for one said wall, the piezoelectric means being adapted to be activated to vibrate to effectively cancel the vibration of said wall thereby preventing it from transmitting noise,
- the thickness of each said layer being thin in relation to the thickness of said walls and the area of each said layer being small in relation to the area of said wall, so as to form an optimal piezo thickness to effectively cancel wall vibration at a low voltage.
In an enclosure comprising walls having a given thickness and size, said walls adapted to transmit noise generated within said enclosure to outside said enclosure, the improvement comprising
- at least one layered bender piezoelectric means affixed to at least one of said walls, said piezoelectric means being adapted to be activated to vibrate by the application of relatively low voltage so as to effectively cancel the vibration of said wall thereby preventing it from transmitting noise,
- the thickness of each said layer being thin in relation to the thickness of said walls and the size of each layer being small in relation to the size of said wall,
- thereby forming an optimal piezo thickness to effectively cancel wall vibration at low voltage.
Dependencies are inferred from the claim text.