Piezoelectric ultrasonic transducer with acoustic matching plate
First Claim
Patent Images
1. An ultrasonic transducer comprising:
- a piezoelectric plate having both surfaces thereof metallized and at least one of the surfaces having a plurality of isolated metallized areas;
a backing material formed on the back surface of said piezoelectric plate; and
an acoustic matching plate formed on the front surface of said piezoelectric plate, having a longitudinal wave velocity within ±
25% of a longitudinal wave velocity of said piezoelectric plate and having a thickness equal to one half of a thickness of said piezoelectric plate.
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Abstract
A monolithic array ultrasonic transducer has a plurality of transducer elements formed thereon by isolating metallized areas on a piezoelectric plate without cutting the piezoelectric plate apart for each transducer element, and an acoustic matching layer having a longitudinal wave velocity within ±25% of a longitudinal wave velocity of the piezoelectric plate and a thickness equal to one half of that of the piezoelectric plate. The acoustic matching layer suppresses the radiation to an object of a partial wave in a direction of 60° to a normal line to the plane of the piezoelectric plate.
141 Citations
5 Claims
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1. An ultrasonic transducer comprising:
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a piezoelectric plate having both surfaces thereof metallized and at least one of the surfaces having a plurality of isolated metallized areas; a backing material formed on the back surface of said piezoelectric plate; and an acoustic matching plate formed on the front surface of said piezoelectric plate, having a longitudinal wave velocity within ±
25% of a longitudinal wave velocity of said piezoelectric plate and having a thickness equal to one half of a thickness of said piezoelectric plate. - View Dependent Claims (2, 3)
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4. An ultrasonic transducer comprising:
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a piezoelectric plate having both surfaces thereof metallized and at least one of the surfaces having a plurality of isolated metallized areas; a backing material formed on the back surface of said piezoelectric plate; a first acoustic matching layer formed on the front surface of said piezoelectric plate and having a longitudinal wave velocity within ±
25% of a longitudinal wave velocity of said piezoelectric plate and a thickness equal to one half of a thickness of said piezoelectric plate; anda second acoustic matching layer formed between said piezoelectric plate and said backing material and having a longitudinal wave velocity within ±
25% of the longitudinal wave velocity of said piezoelectric plate and a thickness no larger than 1/4 of a thickness of said piezoelectric plate. - View Dependent Claims (5)
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Specification