Micromachined ultrasonic transducer with air-backed cavity and electrical connection
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United States of America Patent
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Jan 7, 2014
Grant Date -
Aug 8, 2013
app pub date -
Apr 22, 2011
filing date -
Apr 29, 2010
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Abstract
A method and associated apparatus directed to a piezoelectric micromachined ultrasonic transducer (pMUT) defining an air-backed cavity are provided. A first via defined by a device substrate and associated dielectric layer, and extending to the first electrode, is substantially filled with a first conductive material. A support member engaged with the device substrate defines a second via extending to the first conductive material. The second via has a second conductive material disposed thereon, forms an electrically-conductive engagement with the first conductive material, and extends outwardly of the second via to be accessible externally to the support member. A connective element extends through a third via defined by a connection support substrate and is in electrically-conductive engagement with the second conductive material, wherein one of the connective element and connection support substrate is bonded to one of the support member and second conductive material by a bonding material engaged therebetween.
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