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JPH08154289

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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 JPH08154289
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
array type sound wave transceiver for Doppler soda, and more particularly, to an array type
sound wave transceiver for Doppler soda in which a plurality of bent horn speakers are arranged
in an array.
[0002]
2. Description of the Related Art Heretofore, an array type sound wave transceiver for Doppler
soda in which a plurality of bent horn speakers are arranged in an array has been used as a
transmitting and receiving antenna. As is well known, Doppler Soda continuously measures the
three-dimensional wind direction and velocity components in the atmospheric boundary layer by
detecting the frequency shift of the transmitted sound wave and the frequency of the received
sound wave. This is a device that continuously measures the strength of the air temperature
inversion layer by comparing the strength of the transmitted sound wave and the strength of the
received sound wave. The array type sound wave transmitter-receiver used as a transmitting /
receiving antenna of this Doppler soda is, for example, as shown in FIG. 4, a plurality of bending
horn speakers 101, 102... It has an arrayed structure. In the array type sound wave transceiver
for Doppler soda shown in FIG. 4, the respective bending horn speakers 101, 102... Transmit the
synthetic sound wave in a three-dimensional direction at a predetermined angle as a
transmission antenna, The receiving antenna has a function of receiving the returned sound wave
and outputting it to a signal processing unit (not shown). Each of the bent horn speakers 101,
102,... Of the array type sound wave transceiver for Doppler soda (FIG. 4) having such a function
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has the same structure, for example, as shown in FIG. . As well known, the bending horn speaker
of FIG. 5 is configured to generate a sound wave a by vibrating the diaphragm 5 integral with the
voice coil 6 up and down. The generated sound wave a is guided upward along the horn 3,
reflected by the horn 2 downward, further reflected upward by the reflector 4, and emitted along
the horn 1 into the air.
[0003]
However, the above prior art (FIG. 5) has the following problems when it is raining. (1) Water is
accumulated in the bent horn speaker and no sound wave is emitted. That is, in the bending horn
speaker of FIG. 5, the horn 1 is open at the top, but is closed by the reflection plate 4 at the
bottom. Therefore, when it rains, the water 7 remains in the horn 1 and the generated sound
waves a are shielded by the water 7 and are not emitted into the air. (2) The diaphragm and voice
coil of the bending horn speaker become inoperable. That is, in FIG. 5, when the amount of
rainfall increases and the water volume increases, the height of the water 7 accumulated in the
horn 1 also continues to increase, as shown by arrows b and c, exceeding the height of the horn
Water infiltrates. However, since the lower part of the horn 3 is open as shown in the figure, the
horn 3 is submerged in water invading the diaphragm 5 and the voice coil 6 immediately below
the horn 3 and does not operate. As a result, it is considered impossible to measure wind
direction, wind speed, etc. when it is raining with Doppler soda that uses an array type sound
wave transceiver (Fig. 4) in which a plurality of conventional bent horn speakers (Fig. 5) are
arranged Become. An object of the present invention is to provide a drain opening for draining
each bent horn speaker in an array type sound wave transceiver for Doppler soda, and to enable
measurement of wind direction, wind speed, etc. when raining. is there.
[0004]
SUMMARY OF THE INVENTION The present invention relates to an array type sound wave
transceiver for Doppler soda in which a plurality of bent horn speakers are arranged in an array.
Openings for drainage are formed in each of the plurality of bent horn speakers, and B. A
technical measure is taken that the size of each opening is set smaller than the wavelength of the
sound wave transmitted or received by each bending horn speaker.
[0005]
Therefore, according to the configuration of the present invention, as shown in FIGS. 1 and 2,
openings for draining are formed in each of the bent horn speakers, and the size of each opening
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is determined by each bent horn speaker. By setting the wavelength smaller than the wavelength
of the sound wave to be transmitted or received, water can be drained through the opening even
when it is raining (arrow A in FIG. 2) (arrows B and C in FIG. 2) Acts to enable measurement of
wind direction, wind speed, etc. at the time of rainfall.
[0006]
The invention will now be described by way of example with reference to the accompanying
drawings.
FIG. 1 is a cutaway perspective view showing an embodiment of the present invention, and FIG. 2
is a cross-sectional view showing an embodiment of the present invention. In FIG. 1, reference
numeral 11 is a first horn, 12 is a second horn, 13 is a third horn, 14 is a reflector, 15 is a
diaphragm, 16 is a voice coil, 17, 18, 19 and 20 are openings. is there.
[0007]
(1) Configuration The bent horn speaker shown in FIG. 1 has a frusto-conical shape as a whole,
and has a first horn 11, a second horn 12, a third horn 13, a reflector 14, and a diaphragm 15.
And a voice coil 16.
[0008]
The first horn 11 is the outermost horn, and as shown in the drawing, the upper side is opened,
and the reflecting plate 14 is attached to the lower side.
A second horn 12 is provided inside the first horn 11 as shown in the drawing, and a lower
portion thereof is screwed with a rod-like protrusion (not shown) protruding from the reflection
plate 14. The lower part of the second horn 12 is open and the upper part is closed in a wave
shape so that the sound wave emitted from the diaphragm 15 can be easily reflected.
[0009]
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A third horn 13 is provided inside the second horn 12, and the lower portion of the third horn 13
is inserted into the cylindrical portion 21 protruding from the center of the reflection plate 14.
The third horn 13 is open at the top and the bottom (FIG. 2) to guide the sound wave emitted
from the diaphragm 15 upward.
[0010]
The reflecting plate 14 is entirely disc-shaped (FIG. 1), and its surface is temporarily recessed in
the radial direction from the central cylindrical portion 21 and is raised again at the peripheral
portion including the end face 22 (FIG. 2) It has a shape in which sound waves are easily
reflected. That is, in other words, the surface of the reflecting plate 14 has a shape like a
parabolic antenna. As is well known, the diaphragm 15, the voice coil 16 and the lead wire 30
are integrally provided immediately below the reflection plate 14 (FIG. 2), and the permanent
magnet (not shown) is provided. A so-called electrokinetic sound wave transmitting / receiving
mechanism that operates by the action of the suction force and the repulsive force between them
is constructed.
[0011]
An opening 17 for drainage is formed above the end face 22 of the reflecting plate 14 at the
lower part of the outermost first horn 11 constituting the above-mentioned bent horn speaker
(FIGS. 1 and 2). The size of the opening 17 is set smaller than the wavelength of the sound wave
transmitted or received by the bending horn speaker. The shape of the openings 17 is, for
example, circular as shown in FIG. 1, and in the present embodiment, for example, four are
formed.
[0012]
Further, the reflecting plate 14 is formed with an opening 19 penetrating the peripheral edge
including the end face 22 (FIG. 1, FIG. 2, FIG. 3A), and the opening 18 fitted to the opening 19 is
It is formed on the outermost first horn 11. As described above, the surface of the reflecting plate
14 is shaped like a parabola antenna and is temporarily recessed in the radial direction from the
central cylindrical portion 21 and is raised again at the peripheral portion including the end
surface 22. Therefore, the opening 19 penetrating the peripheral edge including the end face 22
of such a reflector 14 has a depth greater than that of the opening 17 located above the reflector
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14 and the opening 18 fitted to the aperture 19. There is an inlet 19A located inside the
reflecting plate 14 and an outlet 19B located on the end face 22 as shown (FIGS. 1, 2 and 3 (A)).
Further, since the surface of the reflecting plate 14 is parabolic antenna shaped, the inlet 19A of
the opening 19 is inclined further outward with respect to the vertical than the outlet 19B (FIG.
2).
[0013]
As described above, the openings 19 and 18 are formed corresponding to the position of the end
face 22 of the reflection plate 14 because water accumulated during rainfall is accumulated in
the most concave part of the reflection plate 14 as described later. By discharging immediately, it
is possible to transmit and receive sound waves and to perform measurement at the time of
rainfall accurately. That is, only the opening 17 located above the end face 22 of the reflecting
plate 14 has no drainage effect unless the water bulk is increased to the position of the opening
17. However, the amount of rainfall is small due to the openings 19 and 18. Even when the water
volume is not so large, the drainage effect can be easily obtained, and the object of the present
invention can be achieved further.
[0014]
The shape of the openings 17, 18 and 19 is not limited to the circular shape as described above.
For example, as shown in FIG. 3B, a rectangular opening 20 may be formed. However, also in this
case, the size of the rectangular opening 20 must be set smaller than the wavelength of the
sound wave transmitted or received by the bending horn speaker. In the embodiment shown in
FIG. 3B, the above-described circular openings 17 penetrating the first horn 11 and the
rectangular openings 20 are alternately arranged. Therefore, in combination with the opening 19
penetrating the peripheral portion including the end face 22 of the reflecting plate 14, a circular
opening 17 and a rectangular opening penetrating the first horn 11 above the end face 22 of the
reflecting plate 14 The portions 20 are alternately arranged, and at the position of the end face
22 of the reflection plate 14, an opening 19 passing through the peripheral portion including the
end face 22 and an opening 18 passing through the first horn 11 are formed opposite to each
other It will be.
[0015]
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Further, in the present embodiment, the size of the opening 17 located above the end face 22 of
the reflecting plate 14 is larger than the sizes of the openings 19 and 18 located at the end face
22 of the reflecting plate 14, The reverse is also possible. However, even in this case, the size of
the openings 17, 18 and 19 must be set smaller than the wavelength of the sound wave
transmitted or received by each bending horn speaker.
[0016]
(2) Operation Hereinafter, the operation of the present invention having the above configuration
will be described. First, an array type of Doppler soda according to the present invention can be
obtained by arranging a plurality of bending horn speakers (for example, FIG. 1 and FIG. 2)
having the above-mentioned configuration as shown in FIG. Construct an acoustic transducer. In
such a state, an array type sound wave transceiver for Doppler soda is disposed outdoors and
used as a transmitting and receiving antenna.
[0017]
When it is raining, as shown by arrow A in FIG. 2, rain comes down from above the bent horn
speaker, and water first accumulates in the recessed portion of the reflecting plate 14 provided
at the lower portion of the first horn 11. However, since the reflecting plate 14 is formed with
the opening 19 penetrating the peripheral portion including the end face 22, the water
accumulated in the recessed portion is the opening 19 and the first horn adapted thereto. It
passes through the opening 18 and is discharged to the outside (arrow B).
[0018]
Furthermore, when the amount of rainfall increases and the water volume increases, and the
water level becomes higher than the end face 22 of the reflection plate 14, not only the openings
18 and 19 (arrow B), the openings located above the end face 22 of the reflection plate 14 Water
is also discharged from 17 (arrow C). Therefore, as in the prior art, the water does not
accumulate in the bending horn speaker, so that the sound wave is not emitted or the diaphragm
and the voice coil do not operate.
[0019]
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As described above, according to the present invention, drainage openings are formed in each of
the plurality of bent horn speakers of the array type sound wave transceiver for Doppler soda,
and the size of each opening is determined. Is set to be smaller than the wavelength of the sound
wave transmitted or received by each bending horn speaker, so that drainage can be performed
via the opening even when it is raining, and the wind direction at the time of raining -The
technical effect of enabling the measurement of wind speed etc. is achieved.
[0020]
Brief description of the drawings
[0021]
1 is a cutaway perspective view showing an embodiment of the present invention.
[0022]
2 is a cross-sectional view showing an embodiment of the present invention.
[0023]
3 is a detailed view showing an embodiment of the present invention.
[0024]
4 is a general description of an array-type acoustic transducer for Doppler soda.
[0025]
5 is an explanatory view of the prior art.
[0026]
Explanation of sign
[0027]
11 first horn 12 second horn 13 third horn 14 reflection plate 15 diaphragm 16 voice coil 17,
18, 19, 20 opening 21 cylindrical portion 22 end face of reflection plate 14
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