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JPS52150010

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DESCRIPTION JPS52150010
DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. Title of the Invention The horn I1 whose
diameter gradually expands from the throat 2 to the opening 3 of the ultrasonic horn. The tip of
the cylindrical body 4 is integrally connected to the X and I throats 2, and the enlarged aperture
5 is formed in the middle of the cylindrical body 4, and the ultrasonic transducer 6 is attached to
the proximal end of the cylindrical feeling. Ultrasonic horn to be done.
2, the scope of claims
3. Detailed description of the invention As shown in FIG. 1 (a), the conventional ultrasonic horn
has an ultrasonic transducer at the throat a of the horn C whose diameter gradually increases
from the throat a to the opening. The result of actually measuring the sound pressure in the
direction forming an angle at the throat a of the horn C with respect to the central axis C1 of the
horn C is as in the first factor (b). As the alpha degree increases, the sound pressure greatly
increases or decreases, and there is a drawback that the directivity characteristic is bad. The
present invention eliminates the above-mentioned conventional drawbacks. The embodiments of
the present invention will be described with reference to the drawings. 1 is a horn whose
diameter gradually increases from the throat 2 toward the opening 3 A cylindrical body in which
the tip is integrally connected to the throat portion 2 of the horn l, and an enlarged diameter
portion 5 is formed in the inner circumferential mesh of the middle portion thereof. 6 is an
ultrasonic transducer, for example, a piezoelectric crystal piece is mounted with a pair of
electrodes, and when a high frequency voltage is applied between the pair of electrodes, the
piezoelectric crystal piece vibrates to generate ultrasonic waves It is mounted on the proximal
end of the cylindrical body 4. The present invention is configured as described above, and is
improved with respect to the central axis 1 a of the horn 1 at the throat 2 of the horn 1. The
length t from the tip of the cylindrical body 4 to the enlarged aperture portion is approximately
10-05-2019
1
1.3 times the wavelength of the ultrasonic wave, and the ultrasonic vibration from the length t2
of the enlarged aperture portion 5 and the enlarged aperture portion S It is optimal that the
length t3 up to the tip 6 be approximately equal to the wavelength of the ultrasonic wave. As
described above, according to the present invention, the tip end of the cylindrical body 4 is
integrally connected to the throat portion 2 of the horn 1 whose diameter is gradually expanded
as the end page extends from the throat portion 2 to the opening portion 3, and the cylindrical
body Since the enlarged diameter portion S is formed in the middle portion of 4 and the
ultrasonic transducer 6 is attached to the proximal end of the cylindrical body 4, as is apparent
from the measurement results, an effect of improving the directivity characteristic is exhibited.
、4. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (J) is a cross-sectional view of a
conventional ultrasonic horn, FIG. 1 (B) is a directional characteristic of the conventional
ultrasonic horn, and FIG. 2 is a cross-sectional view of an embodiment of the present invention,
FIG. 3 is a directivity characteristic diagram of the ultrasonic horn of the present invention. 1 is a
horn, 2 is a throat portion, 3 is an opening portion, 4 is a 5 body, 5 is an enlarged aperture
portion, 6 is an ultrasonic transducer. Patent applicant Matsushita Electric Works Co., Ltd.
Attorney Attorney Takemoto Toshimaru (2 others) (4) @ 2 Figure 3 End Page: 2
10-05-2019
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