Ultrasonic transducer

Details Ultrasonic transducer Ultrasonic transducer

1994-04-18

1995-08-08

Jaworski, Francis

Surgery

Truss

Pad

310336, A61B 800, H01L 4110

Patent

active

054389992

ABSTRACT:
An ultrasonic transducer which can produce an ultrasonic image having a high resolution and a high detection depth, including a piezoelectric element having a concave surface on a side where ultrasonic waves are transmitted or received, and first and second acoustic matching layers formed on the concave surface of the piezoelectric element, the first acoustic matching layer being laid on a side near to the piezoelectric element and having a non-uniform thickness with a maximum thickness of about quarter wavelength, and the second acoustic matching layer being laid on the side near to an object to be detected and having a uniform thickness of about quarter wavelength. Thereby, the ultrasonic transducer including the acoustic matching layers having the maximum thickness set to about quarter wave length and the piezoelectric element exhibit a normal distribution type frequency characteristic over a wide range, and can allow the piezoelectric element to have an arbitrary curvature so that an ultrasonic wave can be converged at a position having an arbitrary distance.

REFERENCES:
patent: 4184094 (1980-01-01), Kopel
patent: 4205686 (1980-06-01), Harris et al.
patent: 4446395 (1984-05-01), Hadjicostis
patent: 4880012 (1989-11-01), Sato

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