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JPH08280085

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH08280085
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic airborne sound source for emitting sound waves in a desired direction in the air.
[0002]
2. Description of the Related Art FIG. 6 and FIG. 7 show a conventional example of this type of
ultrasonic airborne sound source. In these prior art examples, the sound waves from the stripe
mode diaphragm are focused to a linear sound field or a point sound field by a direction
converter composed of a separator and a parabolic reflector. In these prior art examples, a strong
sound field of about 170 dB for point focusing and about 165 dB for line focusing can be
obtained.
[0003]
Although the above-mentioned ultrasonic airborne sound source can obtain a strong sound field,
it must use a parabolic reflector, resulting in a complicated structure and a large occupied space.
As a result, the manufacturing cost is high.
[0004]
SUMMARY OF THE INVENTION In view of the above problems, the present invention aims to
provide an ultrasonic airborne sound source having a simple structure, a small occupied space,
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and a low manufacturing cost.
[0005]
The ultrasonic airborne sound source of the present invention has a horn fixed to the case such
that one end thereof protrudes into the case and the other end protrudes out of the case, and one
end of the horn And a flat diaphragm fixed to the other end of the horn at the other end of the
horn in a direction perpendicular to the projecting direction of the horn, and formed in a
hexahedron shape so that the diaphragm can be accommodated in the inner space An ultrasonic
air-borne sound source comprising: a reflective casing; and a reflective support column fixing the
reflective casing to the case such that the reflective casing accommodates the diaphragm; two of
the reflective casing The side surface and the front surface and the rear surface are orthogonal to
the extension surface of the diaphragm, but the front surface is an open port, and the upper
surface and the lower surface are orthogonal to the two side surfaces, and the diaphragm is
gradually moved toward the open port. And was inclined to leave Through hole through which
the horn penetrates is provided on the lower surface.
[0006]
The upper surface is releasably connected to one of the side surfaces by a hinge and has a
locking mechanism which releasably locks to the other side surface, and the through hole has a
gap between it and the outer periphery of the horn, The gap is preferably sealed by an elastic
body.
Further, from the outer edge along the opening of the upper surface and the lower surface of the
reflecting rod, the upper surface and the lower surface extend forward in parallel with the virtual
extension surface of the diaphragm, or the opening of the upper surface and the lower surface of
the reflecting rod From the outer edge along the mouth, the upper and lower surfaces are
preferably inclined so as to be slightly closer to the virtual extension of the diaphragm and
extend forward.
Furthermore, one of the upper surface and the lower surface may be deleted.
[0007]
The sound waves emitted from the diaphragm repeat reflections between the diaphragm and the
upper and lower surfaces of the reflector, and are emitted as focused sound waves from the front
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opening.
[0008]
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of an ultrasonic air sound source equipped
with a reflector according to the present invention, FIG. 2 is a sectional view showing a reflector
according to the embodiment of FIG. 1, FIG. 3 is a sound wave in the embodiment of FIG. It is a
figure explaining reflection operation of.
[0009]
A flange 11 is fixed to an intermediate portion of the horn 10 formed of a rod-like metal (usually,
duralumin or a titanium alloy) (the flange 11 may be integrally formed with the horn 10).
The flange 11 is screwed to the upper end of the hollow case 20. A flat diaphragm 13 is
removably mounted horizontally at the upper end of the horn 10 by means of screws. A vibrator
12 is attached to the lower end of the horn 10. The vibrator 12 converts the drive power
supplied by the oscillator 21 through the electric wire 22 into vibration to give longitudinal
vibration to the horn 10 and vibrate the diaphragm 13 up and down.
[0010]
The reflecting rod 30 is formed in a truncated hexahedron hollow rod whose tip is cut, and the
vibrating plate 13 is accommodated therein so as to be capable of vibrating. Further, only the
front surface of the reflective housing 30 is an open port 31 and is surrounded by the side
surfaces 32 and 33, the rear surface 34, the upper surface 34, and the lower surface 35. The
material of the reflective housing 30 may be a rigid body such as aluminum or plastic. The upper
surface 34 and the lower surface 35 respectively have an open taper with an angle θ with
respect to the diaphragm 13 toward the opening 31. Accordingly, the height D of the front
opening 31 is larger than the height d of the rear surface 34. The lower surface 35 is fixed to the
flange 11 fixed to the case 20 by the support column 40, and a through hole through which the
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horn 10 penetrates is provided at substantially the center of the lower surface 35. The through
hole is larger than the outer periphery of the horn 10 so as not to disturb the vibration of the
horn 10, and the gap between the through hole and the horn 10 is sealed with an elastic body 38
(for example, rubber). Also, the upper surface 34 of the reflective housing 30 is rotatable by the
butterfly plate 36 and releasably locked by the lock 37. This is provided for the convenience of
assembly and repair.
[0011]
When the vibrator 12 is driven by the oscillator 21, the diaphragm 13 is vibrated, and sound
waves are repeatedly reflected between the diaphragm 13 and the upper surface 34 or the lower
surface 35 as shown by a broken line in FIG. 3. , Focused in the direction of arrow H and fired. In
actual trial production, it was possible to obtain a sound pressure of 130 dB or more at a
resonance frequency of 19.56 kHz, using 346 × 89 × t 3 duralmin as the upper surface 34 and
the lower surface 35. If the amplitude is further expanded, a larger sound pressure can be
obtained.
[0012]
In the embodiment described above, the upper surface 34 and the lower surface 35 are used, but
when there is a problem in the space, one may be deleted. 4 and 5 show another embodiment. As
shown in FIG. 4, the tip end portion F on the open port side of the upper surface 54 and the
lower surface 55 may extend parallel to the virtual extension surface of the diaphragm 13, as
shown in FIG. The tip portion G on the side may be tapered. By changing the shape of the
opening in this manner, it is possible to adjust the focusing state of the emitted sound wave to a
desired one. As is apparent from these examples, the ultrasound airborne sound source of the
present application can be manufactured at low cost because of its simple structure.
[0013]
As described above, according to the present invention, a plurality of flat surfaces in which one
end is an open port and the upper and lower surfaces are open tapers toward the open port
without using a parabolic reflector. By using the reflector made of the above, and arranging the
diaphragm inside the reflector, the structure can be simplified, the space occupied can be
reduced, and the manufacturing cost can be reduced. is there.
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[0014]
Brief description of the drawings
[0015]
1 is a perspective view showing an embodiment of an ultrasonic airborne sound source having a
reflective housing of the present invention.
[0016]
2 is a cross-sectional view showing a reflective housing of the embodiment of FIG.
[0017]
3 is a diagram for explaining the reflection operation of the sound wave in the embodiment of
FIG.
[0018]
4 is a perspective view showing another embodiment of the present invention.
[0019]
5 is a perspective view showing a further embodiment of the present invention.
[0020]
6 is a perspective view showing a conventional example of an ultrasonic airborne sound source.
[0021]
7 is a perspective view showing another conventional example of the ultrasonic airborne sound
source.
[0022]
Explanation of sign
[0023]
DESCRIPTION OF SYMBOLS 10 horn 11 flange 12 vibrator 13 diaphragm 20 case 21 oscillator
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22 electric wire 30 reflective frame 31 open port 32, 33 side 34 upper surface 35 lower surface
36 hinge 37 lock 38 elastic body 40 support column
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