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JPS5636699

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DESCRIPTION JPS5636699
Description 1, title of the invention
Ultrasonic horn
3. Detailed Description of the Invention The present invention relates to an ultrasonic horn. The
conventional ultrasonic horn is one in which an ultrasonic ceramic vibrator 2 is attached to the
throat portion 1a of a vessel horn 1 as shown in FIG. In this case, the inner shape of the vessel
horn 1 is defined as follows. That is, in FIG. 2, an arbitrary position where X is an arbitrary
position, a horn length is an area of a throat portion (X = O) of tl, and an area of a radiation
opening Cx = 1 is 82. The area S at X is represented by Where n is a coefficient. This ultrasonic
horn has directivity characteristics as shown in FIG. 3 and has a side rope ratio indicating the
difference between the main beam A1 and the first side lobe A2 peak level of about 10 to 15 dB,
which is small. When used for a sound wave switch or the like, there is a problem that
unnecessary detection areas B2 are generated on both sides of the desired detection area B1 as
shown in FIG. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is
to provide an ultrasonic horn capable of improving the directivity by reducing the side lobe ratio.
One embodiment of the present invention is shown in FIG. That is, this ultrasonic horn is one in
which five sound tubes 3 to 7 having different inner diameters constituting an acoustic
transformer are interposed between the throat EndPage: 11 a of the vessel horn 1 and the
ultrasonic ceramic vibrator 2. is there. In this case, the acoustic tube 3 whose front end is joined
to the throat portion 1a of the vessel horn 1 has a radius d of about 1.72λ and a length t of
about 0.86λ, where λ is the wavelength of the ultrasonic ceramic vibrator 2. The acoustic tubes
4 to 7 sequentially joined to the rear end of the acoustic tube 3 have a radius of 0.93 d, a length
o, 1 at; a radius 0.73 d, a length 0.19 t; a radius 0.33 d. , With a length of 0.19 ti radius d and a
length of 0.12 t. This embodiment has directivity as shown by the solid line in FIG. 6, and the side
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rope is reduced by 15 to 18 dB as compared with the directivity of the conventional example
(shown by the broken line). In addition, the change of the directional characteristic with respect
to a temperature change was also able to be made small by this structure. As described above, in
the ultrasonic horn according to the present invention, since the ultrasonic transducer is attached
to the throat portion of the vessel horn by interposing a plurality of acoustic tubes having
different inner diameters in series, the side rope ratio is reduced and directivity is It has the
effect of being able to improve.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of a conventional ultrasonic
horn, FIG. 2 is an explanatory view for explaining a vessel horn, and FIG. 3 is a directivity
characteristic diagram of the ultrasonic horn of FIG. FIG. 4 is a schematic view showing a
detection area, FIG. 5 is a cross-sectional view of an ultrasonic horn according to an embodiment
of the present invention, and FIG. 6 is a directional characteristic view thereof. DESCRIPTION OF
SYMBOLS 1 ... Vessel's horn, 1a ... throat part, 2 ... ultrasonic transducer, 3-7 ... acoustic pipe Fig.
1 Fig. 2 Fig. 3 Fig. 4 EndPage: 2
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