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DESCRIPTION JPH0678389

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DESCRIPTION JPH0678389
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
throat device interposed between a horn unit of a horn speaker and a drive unit, and more
particularly to a combination of a plurality of drive units with the horn unit.
[0002]
2. Description of the Related Art Generally, when driving a horn speaker with high power, a
plurality of drive units may be used, and in the prior art, for example, a throat tool 10 as shown
in FIG. 7 has been used. In the throat tool 10, the horn portion 12 is connected to the tip end
portion thereof, and the branch portions 14 and 16 are bent so as to form a substantially J shape
from the middle toward the outer side, respectively. Drive units 18 and 20 are respectively
coupled to distal ends of the branch portions 14 and 16, and power is supplied to the drive units
18 and 20 from a power amplifier (not shown).
[0003]
Further, as in the throat tool 22 shown in FIG. 8, the branched portions 24 and 26 are bent at a
right angle, and reflecting surfaces 28 and 30 forming 45 ° with respect to the axis of the horn
portion 12 are formed at the bent portions. There is also. Of course, the drive units 18 and 20
are coupled to the tip of each of the branch portions 24 and 26.
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[0004]
Furthermore, as in the throat tool 32 shown in FIG. 9 to FIG. 11, there are also those in which
two gently curved branch portions 33, 34 are joined. In FIGS. 9 to 11, reference numerals 36 and
38 denote flanges for connecting the drive unit, and reference numeral 40 denotes a flange for
connecting with the horn portion 42.
[0005]
However, in the throat tool 10 shown in FIG. 7, as shown by the dotted and solid lines in the
same figure, the length of the sound wave propagation path differs depending on the presence of
the bent portion, and the high frequency There is a problem in that a phase difference occurs in
the sound range of and causes loss.
[0006]
In the throat tool 22 shown in FIG. 8, since the reflecting surfaces 28 and 30 are provided, no
loss based on the path difference occurs as in the throat tool 10 in FIG. 7, but the reflecting
surfaces 28 and 30 are provided. In order to prevent the cross-sectional area of the throat tool
22 from being constricted at the position where the reflective surfaces 28 and 30 are provided,
the ratio of (throat cross-sectional area after reflective surface) / (throat cross-sectional area
before reflective surface) is taken large. It is necessary that the value of W1 in FIG. 8 tends to be
large, and there is a problem that the directivity angle control in the horn portion after that will
be restricted.
[0007]
In the throat tool 32 shown in FIGS. 9 to 11, unlike the throat tool 10 in FIG. 7, the loss based on
the path difference at the bent portion is small, and unlike the throat tool 22 in FIG. Since the
above problem does not occur because it does not exist, as shown in FIG. 10, in the part
connected from the throat tool 32 to the horn part 42, the sound wave is in the direction forming
an angle θ with the axis of the branch parts 33 and 34. In the case of propagation, there is a
problem that a path difference of d sin θ is generated by multiplying the distance d between
both axis lines by sin θ, and phase interference is likely to occur.
[0008]
An object of the present invention is to provide a throat device which solves each of the above-
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mentioned problems.
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, a throat according to a first
aspect of the present invention has a main body portion extending substantially linearly from one
end portion coupled to a horn portion to the other end portion A plurality of bifurcated portions
extending separately from the other end of the main body portion and having a drive unit
coupled to their respective distal end portions; The height of the surface is reduced, and the
distance within the body portion of the axis which passes through the centers of the branch
portions and enters the body is shortened.
[0010]
In the throat device according to the second aspect of the present invention, the drive unit is
coupled to one end, a plurality of mid-folded throats are coupled at the other end, and the horn is
coupled to the coupling, The height dimension of the vertical cross section of the bent portion of
each throat portion is set to about 1/2 or less of the wavelength of the maximum reproduction
frequency of the horn portion.
[0011]
In the throat device according to the first aspect of the present invention, the height of the
vertical cross section in the vicinity of the joint between each branch and the main body is
reduced, so that phase interference hardly occurs.
In addition, since the distance d in the main body of the axis entering the main body through the
center of each branch is shortened, when the sound wave propagates in the direction of θ with
respect to these axes, the path difference is d sin θ However, since d is short, large phase
interference does not occur.
[0012]
In the throat device according to the second invention, the height height of the vertical cross
section of the bent portion of each throat portion is about 1/2 or less of the wavelength of the
maximum reproduction frequency of the horn portion. It was confirmed that almost no phase
interference occurs even at the reproduction frequency.
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[0013]
1 to 3 show a throat tool 50 according to a first embodiment.
This throat tool 50 is substantially Y-shaped as shown in FIG. 2 and has a flange 54 for
connection with the horn portion 52 shown in FIG.
A hollow main body portion 56 extends substantially linearly from the flange 54, and hollow
branch portions 58 and 60 are integrally formed at the distal end portion of the main body
portion 56, respectively.
Flanges 62 and 64 for mounting the drive unit are formed at the tip end of the branched portions
58 and 60, respectively.
[0014]
The main body portion 56 is formed such that its width dimension gradually spreads along the
axis, and the branch portions 58 and 60 are provided so as to make an obtuse angle with the
main body portion 56.
That is, the branch parts 58 and 60 are attached to the main body part 56 in a bent state.
There is no necking in the cross section of the bent portions of the branch portions 58, 60 with
respect to the main body portion 56.
[0015]
The height s of the vertical cross section in the vicinity of the bent portions of the branched
portions 58 and 60 is smaller than the width dimension of the main body portion 56 as shown in
FIG.
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Further, the distance d between the axes 66 and 68 passing through the centers of the branch
portions 58 and 60 and parallel to the center of the main body 56 in the main body portion 56 is
shorter than that in the conventional case. That is, the height s of the longitudinal section and the
distance d between the axes are selected to be smaller than the maximum reproduction
frequency.
[0016]
In the throat tool 50 of this embodiment, the sound waves generated from the drive units
attached to the flanges 62 and 64 propagate through the branch portions 58 and 60 and further
propagate through the main body portion 56 to reach the horn portion 52. However, since the
vertical cross-sectional height dimension s of the branched portions 58 and 60 is reduced, phase
interference is less likely to occur in the bent portions of the branched portions 58 and 60.
Furthermore, since no cross-sectional constriction occurs in the inside of the bent portion, the
throat tool 50 does not easily cause adverse effects in high frequency bands. Further, since the
distance d of the axes 66, 68 in the main body 56 is shortened, when the sound wave propagates
in the direction forming an angle of θ with the axes 66, 68 in the main body 56, the path
difference of dsin θ However, since the value of d is small, the value of dsinθ itself is small and
phase interference hardly occurs.
[0017]
A second embodiment of the throat device 70 is shown in FIGS. The throat device 70 has two
throat portions 72, 74. Since the throat portions 72 and 74 have the same shape, only the throat
portion 72 will be described.
[0018]
The throat unit 72 has a drive unit (not shown) attached to the left end in FIG. 5A, and is inclined
downward from the left end. The throat portion 72 has an upper wall 72a, a lower wall 72b, side
walls 72c, 72d, and the distance between the upper wall 72a and the lower wall 72b, that is, the
sectional height dimension s shown in FIG. It is getting smaller gradually as you head. Further,
the distance between the side walls 72c and 72d is gradually widened toward the lower side, as
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partially shown in FIG. 6 (b). This is for providing a predetermined opening angle in order to
perform directivity control. After the shape is determined, the other side wall is gradually
narrowed until it has a width that is not affected by bending. At this time, it is necessary to
consider that the cross-sectional area does not stop halfway.
[0019]
In the throat portion 72, the cross-sectional height dimension s is at a point greater than 0 at a
wavelength of at least about half the wavelength of the maximum reproduction frequency of the
horn portion (not shown) (point C in FIG. 5B). , Is slightly bent upward. At this time, it is better to
make it as narrow as possible.
[0020]
As shown in FIG. 4, the right end portions of the throat portions 72 and 74 configured in this
manner are coupled to the left end portion of the combining portion 76. A horn (not shown) is
connected to the right end of the combining unit 76.
[0021]
In the throat tool 70, the cross-sectional height s of the bending points of the throat portions 72
and 74 is about 1/2 or less of the wavelength of the maximum reproduction frequency of the
horn portion, so the path difference caused by bending is the maximum It has been
experimentally confirmed that almost no phase interference occurs even at the reproduction
frequency.
[0022]
Since the bending angle is preferably as small as possible, it is desirable to reduce the bending
angle so that the drive units attached to the throats 72 and 74 do not collide.
Further, in order to avoid an abrupt cross sectional area change in the axial direction at the
bending portion, it is more preferable to bend the side wall with an appropriate radius than to
bend the side wall.
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[0023]
In the above two embodiments, two drive units are used, but two or more drive units may be
used. In that case, the number of branches in the first embodiment and the number of throats in
the second embodiment may be equal to the number of drive units.
[0024]
As described above, according to the first and second aspects of the present invention, even
when a high frequency sound wave is input, efficient reproduction can be performed without
phase interference.
[0025]
Brief description of the drawings
[0026]
1 is a perspective view of a first embodiment of the throat device according to the present
invention.
[0027]
2 is a partially omitted longitudinal sectional view of the main part of the first embodiment.
[0028]
3 is a perspective view from the direction different from FIG. 2 of the first embodiment.
[0029]
4 is a perspective view of the second embodiment.
[0030]
5 is a perspective view and a schematic side view of the second embodiment.
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[0031]
6 is a perspective view and a schematic side view of the second embodiment.
[0032]
7 is a front view of an example of a conventional throat device.
[0033]
8 is a front view of another example of a conventional throat device.
[0034]
9 is a perspective view of another example of a conventional throat device.
[0035]
10 is a partially omitted longitudinal sectional view of the main part of the throat device of FIG.
[0036]
11 is a perspective view from the direction different from FIG. 9 of the throat device of FIG.
[0037]
Explanation of sign
[0038]
Reference Signs List 50 throat tool 56 main body portion 58 60 bifurcated portion 70 throat tool
72 74 throat portion
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