Method of manufacturing an apodized ultrasound transducer

Details Method of manufacturing an apodized ultrasound transducer Method of manufacturing an apodized ultrasound transducer

H - Electricity

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356/200

H01L 41/22 (2006.01) B06B 1/06 (2006.01) H01L 41/24 (2006.01)

Patent

CA 1201824

ABSTRACT: "Method of manufacturing an apodized ultrasound transducer." The method comprises the fabricating of a trans- ducer having an active surface from a plate (100) of piezo- electric ceramic material and the selective polarizing of localized regions of the ceramic material so that the degree of polarization of the ceramic material has a pro- file which decreases from a central point or line on the active surface to the edges of the active surface. The method is very simple in that the selective polarizing comprises a first step which consists of the uniform polarizing of the piezoelectric material and a second stop which consists of the partial depolarizing of selec- ted regions of the piezoelectric material. Preferably, during the second step heat is applied at the edges of the surface of the transducer.

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