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JPH10136490

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DESCRIPTION JPH10136490
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic horn used in an ultrasonic sensor.
[0002]
2. Description of the Related Art A conventional ultrasonic horn will be described below.
[0003]
FIG. 2 is a cross-sectional view of a conventional ultrasonic horn, in which 1 is an ultrasonic horn
body provided on the ultrasonic wave transmission side of the ultrasonic sensor 2 and direct
ultrasonic waves 5 corresponding to the horn angle 4 and in the horn The reflected ultrasonic
wave 7 which is reflected and becomes horn angle 4 or more is transmitted to the external space.
[0004]
However, in the above-described conventional configuration, when ultrasonic waves are reflected
in the ultrasonic horn and transmitted from the inside of the horn to the external space, the
ultrasonic waves are transmitted to a region having a horn angle of 4 or more. Is transmitted, and
it has a problem in that it detects an object or a human body outside the area to be detected.
[0005]
02-05-2019
1
An object of the present invention is to provide an ultrasonic horn capable of transmitting
ultrasonic waves in accordance with the horn angle.
[0006]
[Means for Solving the Problems] In order to achieve this object, the ultrasonic horn of the
present invention is configured to provide a sound absorbing material on the inner surface of the
horn, and the inner sound wave is absorbed by the sound absorbing material. Thus, ultrasonic
wave transmission according to the horn angle can be realized.
[0007]
The invention according to claim 1 of the present invention comprises an ultrasonic sensor and a
horn on the ultrasonic wave transmitting side of the ultrasonic sensor, and a sound absorbing
material is provided on the inner surface of the horn. The ultrasonic horn has an action of
realizing ultrasonic transmission according to the horn angle.
[0008]
The invention according to claim 2 is the ultrasonic horn according to claim 1, wherein the sound
absorbing material having irregularities on the surface is used, and the reflected ultrasonic waves
are dispersed and weakened, so that the ultrasonic wave transmission according to the horn
angle Have the effect of realizing
[0009]
The invention according to claim 3 is the ultrasonic horn according to claim 1, wherein the
thickness of the sound absorbing material is larger than 1⁄4 of the ultrasonic frequency (λ), and
the internal ultrasonic waves are more reliably absorbed. be able to.
[0010]
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
(Embodiment 1) FIG. 1 shows a cross section of an ultrasonic horn of the present invention.
In FIG. 1, an ultrasonic horn 1 is provided on the ultrasonic wave transmission side of an
02-05-2019
2
ultrasonic sensor 2, and a sound absorbing material 3 is provided on the inner wall surface of the
ultrasonic horn 1.
[0011]
The ultrasonic wave transmitted from the ultrasonic sensor 2 is divided into an inner ultrasonic
wave 6 reaching the inner surface of the horn and a direct ultrasonic wave 5 according to the
horn angle 4, but the inner ultrasonic wave 6 is absorbed by the sound absorbing material 3 And
disappear, and only the ultrasonic wave 5 is transmitted directly.
[0012]
It is preferable that the sound absorbing material 3 have irregularities on the surface, and the
thickness thereof be greater than 1⁄4 of the ultrasonic frequency (λ).
[0013]
As described above, according to the present invention, by providing a sound absorbing material
on the inner surface of the ultrasonic horn, the reflection of the ultrasonic waves in the horn is
eliminated, and the ultrasonic waves are transmitted to a region larger than the horn angle. It is
possible to realize an ultrasonic horn that can prevent vibration and enable ultrasonic
transmission according to the horn angle.
[0014]
Brief description of the drawings
[0015]
1 is a cross-sectional view of an ultrasonic horn according to an embodiment of the present
invention
[0016]
Fig. 2 Cross section of a conventional ultrasonic horn
[0017]
Explanation of sign
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3
[0018]
1 Ultrasonic horn body 2 Ultrasonic sensor 3 Sound absorbing material
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4
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