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JPS55112989

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DESCRIPTION JPS55112989
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
ultrasonic horn, FIG. 2 is its directivity diagram, FIG. 3 is the same, and FIG. 4 is a cross-sectional
view of another conventional ultrasonic horn in FIG. And FIG. 5 shows an ultrasonic horn
according to the present invention, FIG. 4 is a cross-sectional view taken along the line-in FIG. 5,
FIG. 5 is a cross-sectional view taken along the line -v in FIG. FIG. 11 · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·? ......
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
horn, for example, a transducer 4CI of an ultrasonic switch, and 41 relates to improvement of its
directivity. The conventional ultrasonic horn, as shown in FIG. 1, shows that the diameter of the
horn 3 gradually increases from the throat 1 to the opening 2 in the throat 1 of the horn 3 in a
short cylindrical package 1-. The sound pressure, that is, the directivity characteristic in the
direction of forming an angle α at the throat portion 1 fc with respect to the center axis of the
horn 3, that is, a right-handed one equipped with the ultrasonic transducer 4 protected. Was
obtained as shown in FIG. As understood from this, there is a drawback that the sound pressure
greatly increases or decreases as the angle α increases and so-called side lobes become large.
For example, this type of ultrasonic horn is used as an ultrasonic switch. If operated, this side
lobe may cause a malfunction. By the way, in order to obtain good directivity without the side
lobes, as shown in FIG. 3, a structure is proposed in which an enlarged diameter portion 8 is
provided in the intermediate portion from the throat portion 6 of the horn 5 to the ultrasonic
transducer 7. It is done. However, in this way, the space between the throat portion 6 and the
small diameter portion 9 is enlarged. In the structure in which the bore portion 8 is provided, in
the integral molding of the fat resin, there is a female separation point from the point of die
removal, and the small bore portion 9 is in pressure contact with the periphery of the vibration
surface of the ultrasonic transducer 7 in an annular manner. In order to avoid this, the vibration
characteristic of the ultrasonic transducer 7 mounted on the horn 5 is different from that of the
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ultrasonic transducer 7 alone 2-. 7 and 11j ', the design of the horn 5 is apart, and there is a
point to be worried about actually implementing the structure of the 511th embodiment. This
invention was made in view of the above points, that is, in consideration of the suitability for
integral molding of the horn, and the point that the characteristics are not significantly changed
when the ultrasonic transducer is attached, etc., there is no side lobe. It is an object of the present
invention to provide an ultrasonic horn which can obtain good directivity. Hereinafter, an
embodiment of the present invention will be described based on FIGS. 4 to 6. FIG. In the drawing,
11 is a conical horn whose diameter increases in both directions from the throat 12 to the
opening 13. Reference numeral 14 denotes a cylindrical portion integrally connected to the
throat portion 12. The diameter of the cylindrical portion 140 is larger than the diameter of the
throat portion 12 and there is a step 15 at the connecting portion of the both. Denoted at 16 are
projections formed at three positions on the inner periphery of the cylindrical portion 14 and
have a height continuous with the inner peripheral surface of the throat 12 and extend to
substantially the center of the cylindrical portion 14. 17 takes this ultrasonic horn 27. The above
components are integrally formed of synthetic resin, and the ultrasonic transducer 18 is
interspersed in the cylindrical portion 14 from the base 17 side.
For example, the piezoelectric vibrator 18 and a pair of electrodes holding the piezoelectric
element and the piezoelectric element are protected by a substantially cylindrical package, and
the upper bottom surface thereof is the vibration surface 19. The ultrasonic transducer 18
inserted from the end is positioned so as to abut on the projection 16 to maintain a
predetermined distance tf with the throat portion 12. Although not shown, for example, a printed
circuit board or the like attached to the base 17 holds the ultrasonic transducer 18 via an elastic
material such as a sponge. In the ultrasonic horn according to the present invention configured
as described above, the results of measurement as in FIG. 2 are shown in FIG. 6, but as indicated
by the ring in FIG. Can be quickly attenuated, and very good directivity of side lobes can be
obtained. 4−し! On the other hand, when the ultrasonic horn is integrally molded with a resin,
according to the structure as described above, since there is no hindrance to the mold removal, it
can be easily manufactured by the usual molding technology. Furthermore, since only the
projections 16 and the three points of the sound are in contact with the imaging surface 19 of
the ultrasonic transducer 18, the vibration characteristics of Takeko are also obtained by the
contact as in Q]. It is easy to design the horn 11 so as to have the desired directivity without
changing significantly. As described above, when the length t of the gap formed between the
throat 12 and the ultrasonic transducer 18, that is, the length l of the projection 161I11, is equal
to one wavelength l of the ultrasonic wave, it is the best. Directivity was obtained. As is apparent
from the above description, according to the present invention, the sound wave horn according
to the present invention provides good directivity without side lobes, and in the case where this
is applied to an ultrasonic switch, With such an advantage as the object superiority, the detection
reliability can be improved without malfunction. 5−−8, 1
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