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JPS5794800

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DESCRIPTION JPS5794800
Description 1, title of the invention
Acoustic horn
3. Detailed Description of the Invention The present invention relates to the geometry of an
acoustic horn for controlling the inter-radial characteristics of an ultrasonic transducer.
Heretofore, there are the acoustic horns of this type as shown in FIGS. In FIGS. 1 to 3, (a) is a
front view, (b) is a side sectional view, and the ultrasonic transducer 1 is fixed to the acoustic
horn structure 2. The ultrasonic waves emitted from the vibration surface 1a of the ultrasonic
transducer 1 are guided to the space through the air + d 74 minutes 2a forming the horn. Also,
Fig. 1 shows the throat part 2C of the horn in which the vibration IIJ of the ultrasonic transducer
is produced, and Fig. 2 moves the vibration m11a to the back of the throat part 2C to extend the
inner wall of the horn ( It shows what was placed at the intersection of the collapse part). Fig. 3
has the same shape as the horn tweeter used in the acoustic device, and squeezes the throat
portion 2C largely, places the vibrating surface 1a behind it, provides a space portion 2e, and
applies an air load to the suspension surface 1a. It has become. Since the vibration plane xac) B
diameter do of the ultrasonic transducer 1 is generally larger than the wavelength, it is
considered that most of the vibration energy of the ultrasonic wave is concentrated near the
center of the a movement 1g 71a. Although there is no problem, if the diameter of the throat
portion of the horn is the same as that of this dO, that is, in the example of FIGS. 10 and 2, it
actually operates as a horn, but otherwise it is A and B respectively. This causes unnecessary
components on the inner wall of the horn as shown, which often causes the side lobes to become
Ji and causes the characteristics of FIG. 5 (C). This inclination is the same ultrasonic transducer.
When using a horn, it is so remarkable that the horn is made smaller. (If the size of the EndPage:
1 throat part 2C is small, the point sound source is apparently present in this part, so
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unnecessary reflection on the inner wall of the horn does not occur, and the objective fifth The
directivity shown in Fig. (B) is obtained. However, when using the sound / d-horn thus configured
as an exterior part for a car, that is, using the so-called evil Am, the throat part 2C gets cold due
to the mud, the vacant station part 2e (and enters Depending on the environment, for example,
the foreign body can not be removed, and the Tl 4 JJ surface 1a of the ultrasonic transducer 1
can not be cleaned. The present invention has been made in view of the above problems, and by
considering the shape of the horn connected to the ultrasonic transducer, the ultrasonic
transducer (also referred to as a chord U microphone) M '$ When the i-plane is viewed from the
mouse G'w of the horn, the reflection finger surface characteristics of the ultrasonic transducer
can be freely played without 7- = M Δ H す, and the side lobe is small. Provided is an acoustic
horn for an ultrasonic transducer capable of cleaning the inner part of the horn and the kIIj J
surface of the above-mentioned chord 1 and the wave receiver even when the dysarthrothma is
given 1 and soiled by a brother etc. To aim to do.
The present invention will be described below with reference to an embodiment shown in the
drawings. FIGS. 4 (a) and 4 (b) are front + a side views H1 showing the first embodiment of the
present invention. In FIG. 4 (a), etc., a throat portion 2- is provided between the mouse portion 2b
of the horn and the J movement surface 1a of the ultrasonic transducer 1, and this throat portion
2d is fitted to the vibration surface 1a. The inner wall surface of the space 2f is connected by a
continuous tapered surface. The diameter d3 of the throat portion 2d is slightly smaller than the
diameter do of the vibrating surface 1a. In addition, the position of the vibrating surface 1a is a
fish that substantially intersects with the extension A of the horn inner wall surface. In the horn
having such a shape, the diameter d3 of the throat portion 2d is set to 1. of the vibrating surface
1a by melting the shape of the taper portion according to JIJ. : A large portion of the component
of the vibration A component of the vibration m 11 a that causes unnecessary reflection, as
shown by the arrow C of 1, is confined within the viscos 2-f without being so small compared to
the L diameter dO. It is possible to As a result, it is possible to obtain directivity characteristics
with few side lobes as shown in FIG. 5 (d) in which the diameter d3 of the throat portion 2d is a
relatively large value temo (experimental circle: do = φ25 mm, d3 = φ15 mm). By adopting such
a shape, the directivity characteristics in the cases of FIGS. 12 and 2 are improved, and
characteristics close to those in the case of the example of FIG. 3 are obtained, and The
disadvantages of using a horn are eliminated, and an excellent π-type can be obtained as a
small-sized horn for an automobile. Next, a second embodiment will be described. 6 (a), 6 (b) and
6 (c) are a front view, a side sectional view and a plan sectional view in the axial direction, when
viewed from the mouse portion 2g, the throat portion 2d is circular and the mouse portion 2g is
The inner wall between the throat portion 2d and the mouse portion 2g is continuously
connected. The directivity obtained by this is shown in FIGS. 7 (a) and 7 (b), and the directivity of
d 40,000 times in FIG. 6 is (a) in FIG. As for the sex, the seventh (b) is obtained. In the above
embodiment, the operation of the ultrasonic transducer 1 is the same regardless of whether it is
used as a transmitter or a receiver. Further, in the embodiment of FIG. 6, the shape of the throat
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portion 2d is a circle having a diameter d3, but it is needless to say that a general shape such as
an oval or a length to a square may be used. Also, the shape of the mouse portion 2g should be
determined according to the target directivity, and it goes without saying that there may be a
general shape such as an oval or a rectangle other than the oval of this example.
As a whole, the shape of the horn inner wall surface between the mouse portion 2g and the
throat portion 2d and the inner wall surface of the space 2f is as shown in FIG. In addition to
straight straight, it may be in the form of exponential, catenoidal, para, etc. Also, the positions in
FIGS. 4 and 6 on the vibrating surface 1a are not necessarily limited to this position, and if on the
axial direction of the sound i horn configuration 俸 2, depending on the distribution of the
vibration of the vibrating surface 1a It may change. Next, an example in which the acoustic horn
of FIG. 6 and the ultrasonic transducer 1 EndPage: 2 are combined and mounted on a car is
shown in FIGS. 8 (a) and 8 (b). In FIGS. 8 (a) and 8 (b), 3a represents the directivity in the
horizontal direction, 3b represents the directivity in the vertical direction, and 4a and 4b
represent the combination of the acoustic horn and the ultrasonic transducer 1. It operates as a
transmitter, and 5a and 5b operate as a receiver, and are fixed to the vehicle 6, respectively. In
the case of normal operation, if there is an obstacle 7 as shown in the figure, the ultrasound
output emitted to the space from the transmitter 4a is reflected on the obstacle 7 as shown by
the path shown by the arrow in the figure. Since it becomes an input of the wave receiver 5a, the
obstacle 7 can be detected. In this case, since the directivity of the transducers 4a, 4b% '5a, 5b is
shown in FIGS. 7 (a) and 7 (b) and there are few siderows (-), the direct wave path in each
combination of transmission and reception = Therefore, it is possible to perform obstacle
detection which eliminates the cause of the malfunction due to the recoil wave. As described
above, in the present invention, the throat portion is provided in the middle of the ultrasonic
transducer and the mouse portion, and the inner wall surface of the horn is continuously made
the same as the throat portion and the * and 40 =. Since it is formed with a tabular surface, it is
possible to obtain a small radiation directivity characteristic of side lobes, and furthermore, even
when soiled with mud etc., it is possible to clean the inside of the horn and the vibrating surface
of the ultrasonic transducer. It has an immersed effect.
4. Brief description of the drawings FIGS. 1 (a), 1) to 3 (a), 3 (b) are front views, side sectional
views, and 4 (a) showing the configuration of the conventional acoustic horn, respectively. , 6) is
a side sectional view of the first embodiment of the present invention, FIG. 5 (a), (c), (c) and (d)
are characteristic diagrams showing respective directivity, FIG. a), (b), (C) are front views and side
sectional views showing a second embodiment of the present invention, and FIG. 7 is a
characteristic diagram showing directivity in 42 embodiments of the present invention Fig. 8 (a),
etc. is an explanatory view of the attachment of a poem in which the second embodiment of the
present invention is mounted on a car. 1 ... ultrasonic transducer, 1a ... vibration surface, 2b, 2g ...
mouse portion, 2d ... throat portion. Agent Patent Attorneys EndPage: 3
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