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Description 1, title of the invention
Underwater ultrasonic transducer
3. Detailed Description of the Invention The present invention provides an ultrasonic transducer
having arbitrary directivity characteristics and high transmission / reception sensitivity by using
a plurality of rectangular plate piezoelectric transducers. In addition, the present invention
provides an ultrasonic transducer mechanically and chemically stronger than the conventional
piezoelectric vibrator. In the following, embodiments of the present invention will be described
using the drawings. FIG. 1 is a cross-sectional view of the ultrasonic transducer of the present
invention, and FIG. 2 is a cross-sectional view of the side of the ultrasonic transducer of the
present invention. In FIG. 1 and FIG. 2, 1 is a rectangular plate piezoelectric vibrator with
electrodes attached to its main surface, 2 is an electrode surface, 3 is a hardened foam stirono 4
is a resin, and 8 is an acoustic radiation surface of the piezoelectric vibrator It is. Next, the
operation will be described. The rectangular plate piezoelectric element performs lateral effect
width vibration and radiates acoustic power from the acoustic radiation surface A to an external
medium. The number of piezoelectric vibrators to be bonded is determined in consideration of
the size of the transmission / reception sensitivity and the directivity. In the figure, four
piezoelectric vibrators are bonded to form one transmitter / receiver. In order to sharpen the
directivity characteristics, the area of the acoustic emission surface may be increased by
increasing the number of sheets to be attached. When used as a transmitter (in the case where
the dimensions of the rectangular plate piezoelectric vibrator are determined so that the
resonance frequency of the piezoelectric vibrator after construction matches the used frequency,
and used as a receiver (?, after construction) If the antiresonance frequency of the piezoelectric
vibrator is made to coincide with the use frequency, it is possible to obtain an ultrasonic
transmission EndPage: 1 receiver with high transmission sensitivity and reception sensitivity. The
hard polystyrene foam 3 covers one of the two free ends and uses only the A side as a
mechanical terminal to improve the wave transmission sensitivity and to mechanically protect
the piezoelectric vibrator 2 Have one effect. 4 is a silicone resin, which serves as mechanical and
chemical protection. As described above, the ultrasonic transducer according to the present
invention has the following effects. (1) Since a plurality of rectangular piezoelectric vibrators are
used, one vibrator can be made thin, so that in the case of a piezoelectric ceramic vibrator, it is
easy to polarize. (2) The transmission / reception sensitivity and directivity characteristics can be
changed only by changing the number of laminations without changing the shape of the
rectangular piezoelectric vibrator which is a component. In addition, it is possible to reduce the
thickness of one transducer, because it can be made inexpensive as well as having a great
advantage (3). Thus, an ultrasonic transducer having a large capacitance can be obtained. (5) The
rectangular plate piezoelectric vibrator is mechanically strong except for the acoustic radiation
surface (because it is almost doubly covered.
(6) The structure is simple and easy to manufacture.
4. Brief Description of the Drawings FIG. 1 is a perspective view of an ultrasonic transducer
according to an embodiment of the present invention, and FIG. 2 is perpendicular to an acoustic
emission surface of an ultrasonic transducer according to an embodiment of the present
invention. Is a cross-sectional view of a plane. 1
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Name of Agent Attorney Nakao and 1 other EndPage: ?
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