Ultrasonic transducer with a piezoelectric element
First Claim
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1. An ultrasonic transducer comprising:
- transducer element means for converting between electrical energy and ultrasonic acoustical energy;
diaphragm means, connected at the substantial center thereof to said transducer element means, for coupling acoustical energy to and from said transducer element means;
horn means, including means defining a chamber wherein said transducer element means and diaphragm means are disposed and further including means defining a circular aperture opening into said chamber, said horn means for coupling acoustical energy between said diaphragm means and the air outside said horn means, said horn means having a predetermined directivity pattern; and
disc means, covering said aperture defined by said horn means and including means defining plural apertures therethrough, for altering the directivity pattern of said horn means.
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Abstract
An ultrasonic transducer having, in a throat part of a horn, a piezoelectric element and a diaphragm connected by a connection rod to the piezoelectric element. A disk having a plurality of apertures is disposed in front of the diaphragm, thereby improving the directivity and sensitivity without losing transient characteristic, making the transducer very suitable for ultrasonic distance measurement in air.
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Citations
21 Claims
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1. An ultrasonic transducer comprising:
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transducer element means for converting between electrical energy and ultrasonic acoustical energy; diaphragm means, connected at the substantial center thereof to said transducer element means, for coupling acoustical energy to and from said transducer element means; horn means, including means defining a chamber wherein said transducer element means and diaphragm means are disposed and further including means defining a circular aperture opening into said chamber, said horn means for coupling acoustical energy between said diaphragm means and the air outside said horn means, said horn means having a predetermined directivity pattern; and disc means, covering said aperture defined by said horn means and including means defining plural apertures therethrough, for altering the directivity pattern of said horn means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification