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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an
example of a conventional ultrasonic transducer in FIG. 2 of the present invention, and 10 is a
piezoelectric ceramic (transducer) 11 is a resonant additive, 12 Is a radiation tool, and 20.21 is a
piezoelectric ceramic whose polarization directions correspond to each other.
DETAILED DESCRIPTION OF THE INVENTION 1 'The present invention relates to the structure of
an ultrasonic transducer. Conventionally, as shown in FIG. 2, two piezoelectric ceramics 20.21
are polarized in opposite directions, and a through hole is provided in the center. (Example,
Japanese Patent Publication No. 47-36419. JP-B-47-36765, etc.) However, in the above
configuration, the present invention has been provided in which the present invention was
considered in connection with these problems, which had defects that increased the cost due to
using two piezoelectric ceramics. Follow up and describe. In the second K (/-/ I 覧 1) invention, as
shown in the cross-sectional view in FIG. 1, an example of the resonance additive 11 is bonded to
one surface of a single piezoelectric ceramic 10 and the other surface is radiated A tool 12 is
provided. With such a structure, since it can be replaced by a resonance additive object which
can be stably produced by a press etc. in comparison with a piezoelectric ceramic, it is possible to
achieve a stable super There is an effect that a sound wave transmitting and receiving tool can be
manufactured. In the drawing, the resonance addition object 11 is drawn smaller than the
piezoelectric ceramic 10, but it goes without saying that their shapes can be arbitrarily combined
according to the target electrical characteristics. In the drawings, we omitted the peripheral parts
such as lead wires. According to the present invention, it is possible to obtain an inexpensive and
stable ultrasonic transducer, and the industrial value is great.
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