SAW TRANSDUCER INTERFACE TO PRESSURE SENSING DIAPHRAGM
First Claim
1. A sensor assembly, comprising:
- a substrate with at least one acoustic wave resonator provided thereon, wherein said at least one acoustic wave resonator is configured to provide an electrical output signal indicative of an associated physical parameter;
a pointed projection provided on and extending from a selected location on said substrate; and
a casing assembly for providing a sealed package around said substrate and components provided thereon;
wherein at least a portion of said casing assembly forms a recessed surface area capable of flexing to interface with the pointed projection provided on and extending from the selected location on said substrate.
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Accused Products
Abstract
A sensor assembly for monitoring physical parameters in a given environment, such as in a tire or wheel assembly, includes an improved interface between sensor components. The sensor assembly includes a piezoelectric substrate on which resonator elements, such as surface acoustic wave (SAW) resonators are provided. The resonators are configured to produce electrical output at predetermined resonator frequency ranges that can be monitored to determined such information as pressure and temperature to which such devices are subjected. A projection is formed on a surface of the piezoelectric substrate, which selectively interfaces with a recessed surface area in a flexible lid casing component. The lid casing component and a rigid base casing component combine to form an enclosed package for the sensor assembly. An antenna may be coupled to the sensor assembly to facilitate receipt and/or transmission of communicated signals.
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Citations
20 Claims
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1. A sensor assembly, comprising:
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a substrate with at least one acoustic wave resonator provided thereon, wherein said at least one acoustic wave resonator is configured to provide an electrical output signal indicative of an associated physical parameter;
a pointed projection provided on and extending from a selected location on said substrate; and
a casing assembly for providing a sealed package around said substrate and components provided thereon;
wherein at least a portion of said casing assembly forms a recessed surface area capable of flexing to interface with the pointed projection provided on and extending from the selected location on said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 20)
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8. A sensor assembly, comprising:
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a piezoelectric substrate with at least one acoustic wave resonator element provided thereon, wherein said at least one acoustic wave resonator element is configured to provide an electrical output signal indicative of an associated physical parameter;
a projection provided on and extending from a selected location on said piezoelectric substrate;
a first casing portion for providing a rigid base to support said piezoelectric substrate; and
a second casing portion for providing a flexible lid configured for adjacent positioning to said first casing portion such that said first and second casing portions form an enclosure for said piezoelectric substrate and components provided thereon;
wherein a substantially flat indentation area is formed in said second casing portion, said substantially flat indentation area being in continuous contact with the projection provided on and extending from the selected location on said piezoelectric substrate;
and wherein the electrical output signal from said at least one acoustic wae resonator element is capable of varying within a continuous range based on the level of force between said substantially flat indentation area and said projection. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A tire assembly, comprising:
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a pneumatic tire structure;
a sensor assembly mounted to said pneumatic tire structure, said sensor assembly comprising;
a substrate with at least one acoustic wave resonator element provided thereon, wherein said at least one acoustic wave resonator element is configured to provide an electrical output signal indicative of an associated physical parameter;
a projection provided on and extending from a selected location on said substrate; and
a casing assembly for providing a sealed package around said substrate and components provided thereon;
wherein at least a portion of said casing assembly forms a recessed surface area provided in continuous contact with said projection and configured for withstanding varied levels of force between the recessed surface area and the projection. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification