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JPS53107326

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DESCRIPTION JPS53107326
Specification 1, name of the invention ultrasonic horn
[2] special order 清 11 [11] from the throat to the head of the mouth 1 こ ζ 円 形 円 形 円 形
%%%%%% ホ ー ン ホ ー ン ホ ー ン ホ ー ン ホ ー ン 連接 連接 連接 連接 連接 連接 連接 連接 連
接 連接An ultrasonic transducer is attached to the base end of the cylindrical body, and a circular
hole having a smaller diameter than the inner diameter of the throat of the horn and the inner
diameter of the cylindrical body on the inner peripheral barrel at the tip of the cylindrical body.
An ultrasonic horn provided with a partition plate having
, 3, detailed description of the invention 2. A conventional ultrasonic horn has a throat as shown
in FIG. A term acoustic wave transducer d is attached to the throat of the horn C whose circular
inner diameter gradually expands as the section a advances toward the opening end, and the
throat of the horn C with respect to the central axis e of the horn C The results of measurement
of the sound pressure g in the direction 1 forming an angle of f degrees in the part a are as
shown in FIG. 1 (b): (1) The sound pressure becomes thicker (increases) as the angle f increases.
The present invention eliminates the above-mentioned conventional drawbacks, and the present
invention will be described with reference to the drawings. The horn whose inner diameter
gradually expands from the end toward the open end 3 is a cylindrical body whose tip is
connected to the throat 2 of the horn l, and the diameter of the throat 2 of the horn l at its tip
inner circumference A partition plate 6 having a circular hole 5 with a smaller diameter is
provided, and at the end of the cylindrical body 4, piezoelectricity is provided. The Akirahen formed by mounting a pair of electrodes ultrasonic transducer 7 is mounted. Then, in FIG. 2, the
length between the ultrasonic transducer 7 of the cylindrical body 4 and the partition plate 6 is
made approximately half the wavelength of the ultrasonic wave emitted by the ultrasonic
transducer 7, and the inner diameter is said In this embodiment, the diameter of the circular hole
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5 is larger than the diameter of the circular hole 5 (in the embodiment shown in FIG. 3, the
distance between the ultrasonic transducer 7 of the cylindrical body 4 and the partition plate 6 is
The inner diameter of the sound wave vibrator side is reduced to be the same as the same
diameter of the throat 2 of the horn 1 and the inner diameter of the partition plate 6 is larger
than the inner diameter of the throat 2 of the horn 1 The length of the reduced diameter portion
− is approximately half of the wavelength of the ultrasonic wave emitted by the ultrasonic
transducer, and the length of the enlarged diameter portion 8b is upper. EndPage: approximately
4 of the wavelength of the ultrasonic wave In the embodiment of FIG. 4 and in FIG. 4, the
ultrasonic wave of the cylindrical body 4, both ends between the vibrator weir and the partition
plate 6 The inside diameter is the same as the inside diameter of the horn 1 and the throat 2 of
the part 1. Make the diameter of the middle part 8a, 8k and the diameter of the middle part be
the enlarged diameter 8b larger than the inside diameter of the throat 2 of the horn. The length
of the enlarged aperture portion 8b is set to three quarters of the wavelength of the ultrasonic
wave, with the length of each of the portions 8a and Era as approximately one half of the
wavelength of the ultrasonic wave emitted by the ultrasonic probe. In the case of FIGS. 3 and 4,
the cylindrical body 4 is divided into two cylindrical pieces 4a and 4b in order to facilitate
molding of the cylindrical body 4. The cylindrical body 4 is formed by connecting the cylindrical
body pieces 4a and 4b to each other. According to the present invention, in the case of FIG. 2, the
sound pressure H in the direction forming an angle of 6 degrees in the throat portion 2 of the
horn 4 with respect to the central axis 1a of the horn 1 in the case of FIG. As shown in FIG. 5
(when the angle σ becomes a predetermined value or more, the sound pressure H decreases and
greatly increases and decreases, the directivity characteristic becomes good, and the same
applies to the cases of FIGS. 3 and 4 A result is obtained.
As described above, according to the present invention, the tip of the cylindrical body is
connected to the throat of the horn whose circular inner diameter is expanded from the throat to
the opening end, and the noodle-making wave is produced at the proximal end of the cylindrical
body. A vibrator is mounted, and a partition plate having a circular hole whose diameter is
smaller than the inner diameter of the throat portion of the tip end of the cylindrical body and
the inner diameter of the cylindrical body is provided. Since it is a thing, it is effective in the
ability to provide an ultrasonic horn with a favorable directional characteristic, as understood
from a measurement result.
4. Brief description of the drawings FIG. 1 (a) is a cross-sectional view of a conventional
ultrasonic horn, FIG. 1 (b) is a characteristic view of a conventional ultrasonic horn, and FIGS.
FIG. 5 is a cross-sectional view of a different embodiment, and FIG. 5 is a characteristic view of
the ultrasonic horn of the present invention. Y is a horn, 2 is a throat, 3 is an open end, 4 is a
cylindrical body, 5 is a circular hole, 6 is a partition plate, 7 is an & f wave wave motion child. @
1 (a) 1. . 2nd 3rd F @ 49 Figure 5 11 EndPage: 2
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