Second harmonic imaging transducers
March 26, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesVariable acoustic wave energy transfer-characteristic control device Ultrasonic transducer Ultrasonic transducer with a plastic piezoelectric receiving layer and a non plastic transmitting layer Multiple-frequency acoustic transducer, especially for medical imaging Signal conditioning and interconnection for an acoustic transducer Electrical impedance normalization for an ultrasonic transducer array Electrical interconnect for multilayer transducer elements of a two-dimensional transducer array Ultrasonic transducer having two or more resonance frequencies Tunable acoustic resonator for clinical ultrasonic transducers Patent #: 5438554 InventorsApplicationNo. 622483 filed on 03/26/1996US Classes:310/317, Input circuit for mechanical output from piezoelectric element310/319, Electrical output circuit310/334, Acoustic wave type generator or receiver310/366More than twoExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmInternational ClassH01L 041/08AbstractA harmonic imaging transducer is a structure of two mechanically coupled piezoelectric layers. This two-layer piezoelectric structure may vibrate either in a symmetric mode, wherein the two layers are expanding and contracting in unison, or in an anti-symmetric mode, wherein one layer is contracting while the other is expanding. Symmetric mode vibrations result in first harmonic operation, while anti-symmetric mode vibrations result in second harmonic operation. | |
