Title: Composite ultrasonic transducers and methods for making the same
Application Number: 85102335 Application Date: 1985.04.01
Publication Number: 1007309 Publication Date: 1987.01.17
Approval Pub. Date: Granted Pub. Date: 1989.07.05
International Classifi-cation: H01L41/00,H04R17/00
Applicant(s) Name: Hitachi, Ltd. Address:
Inventor(s) Name: Chitose Nakaya, Hiroshi Takeuchi
Attorney & Agent: HE GUANYUAN
Abstract:
     A ultrasonic transducer using such a piezoelectric composite that a number of piezoelectric poles made of piezoelectric ceramics are arranged in a plate-like polymer matrix perpendicular to the plate surface. The volume ratio of the piezoelectric poles is set in a range of 0.15-0.75 and a spacing between every adjacent piezoelectric poles is set smaller than the thickness of the polymer plate, thereby resulting in a transducer which has higher sensitivity than the conventional one using a homogeneous piezoelectric ceramic plate.
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