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JP2008278229

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008278229
The present invention provides a back load horn capable of improving acoustic characteristics by
increasing reproducible sound pressure without losing the characteristics of a thin and compact
back load horn. SOLUTION: A horn 2 having two speaker units P and two horns 2A and 2B is
disposed in a cabinet 1, and the horn 2 is disposed at a position adjacent to the two speaker units
P in the cabinet 1. A horn inlet h1 common to the portions 2A and 2B is provided, and the first
throat portion s1 of each horn portion 2A and 2B is connected to the horn inlet h1, and the horn
portions 2A and 2B common to the outer wall portion of the cabinet An eighth throat portion s8
having a cross-sectional area larger than the cross-sectional area of the throats s1 to s7 of the
horn portions 2A and 2B is connected to the horn outlet h2, and the eighth throat portion s8 is
connected to the horn portions 2A and 2B, respectively. The seventh throat section s7 is
connected. [Selected figure] Figure 1
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[0001]
The present invention relates to the configuration of a back load horn.
[0002]
In general, the backload horn has a structure in the cabinet that is connected to the rear side of
the speaker unit and the throat portion is folded.
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With this type of backload horn, sound waves output from the front side of the speaker unit are
emitted directly to the front of the cabinet, and sound waves output from the back side of the
speaker unit have a small volume of the horn Sound is emitted from the horn toward any
direction such as the front side, the side side, the rear side, etc. of the cabinet through the throat
portion, and it has a feature that sound can be reproduced efficiently. (See, for example, Patent
Document 1).
[0003]
Since this back load horn can make the cabinet thin and compact, it can be arranged in a limited
narrow space such as the bottom of a TV receiver or a vehicle cabin.
[0004]
However, in the conventional back load horn, when the throat portion of the horn is folded, when
the sound is reproduced, a wind noise is easily generated due to a change in the cross-sectional
area at the folded portion of the throat portion. As the sound pressure to be reproduced is
increased, a loud wind noise is generated, so there is a problem that the acoustic characteristic is
deteriorated.
[0005]
Also, in the configuration of the conventional backload horn, in order to improve the output
performance such as increasing the upper limit of the sound pressure to be reproduced, if a
speaker unit having a large aperture or amplitude is used, the cabinet There is a problem that the
features of the back load horn, such as the thin and compact, are deteriorated as the outer shape
of the back diameter becomes large.
[0006]
Patent No. 2783839 gazette
[0007]
This invention makes it one of the technical subjects to solve the problem etc. which the abovementioned conventional back load horn has.
[0008]
In order to achieve the above object, a back load horn according to the present invention
comprises a cabinet, a plurality of speaker units, and a horn, wherein the speaker unit is disposed
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in contact with the cabinet, and the horn is a horn. An inlet, a horn outlet, and a plurality of horns
having a throat, wherein a horn inlet is provided at a position adjacent to the plurality of speaker
units, and the throat is connected to the horn inlet It is characterized by
[0009]
The back load horn according to the present invention includes a cabinet, a speaker unit and a
horn, and a plurality of speaker units are provided in contact with the cabinet, and the horns
respectively correspond to the respective speaker units and have throats. The horn inlet common
to each horn is provided at a position adjacent to a plurality of speaker units, the throat of each
horn is connected to the horn inlet, and the outer wall of the cabinet is provided. The back load
horn is provided with a horn outlet common to each horn at any position of the embodiment.
[0010]
In the back load horn according to this embodiment, sound waves output from the back side of
the plurality of speaker units are dispersed to each of the plurality of horn portions from the
horn inlet and pass through the horn portions when the back load horn is driven. Sound is
emitted from the horn outlet.
[0011]
According to the back load horn of this embodiment, when a plurality of speaker units are
provided, the same sound pressure as that of the back load horn having one speaker unit can be
obtained. The amplitude and aperture can be reduced, and as the speaker unit becomes thinner,
the cabinet of the backload horn can be made thinner than before, and when the thickness is the
same as that of the conventional cabinet This makes it possible to increase the sound pressure
obtained as compared to the prior art.
Furthermore, in the back load horn having one speaker unit, the acoustic load acting on the
speaker unit is large, whereas in the back load horn having a plurality of speaker units, the
acoustic load acting on one speaker unit Can be reduced.
[0012]
And, by providing the horns with the same number of horns in the cabinet corresponding to a
plurality of speaker units, it is possible to make the acoustic load acting on each speaker unit
approximately the same size. Therefore, when the speaker unit is driven, the occurrence of the
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so-called rolling phenomenon or the like in which the vibrating body of the speaker (including
the diaphragm, the edge, the voice coil, the voice coil bobbin etc.) Even when the speaker unit is
driven, constant acoustic characteristics can be maintained.
[0013]
In the backload horn of the above embodiment, the horn preferably comprises a shared throat,
and the shared throat is preferably disposed between the throat and the horn outlet.
A back load horn in which a horn outlet is provided for each horn portion is provided with a
common throat, and a wind noise is easily generated due to a reduction in the cross-sectional
area of the horn outlet.
On the other hand, in the back load horn of the above embodiment, the sound waves respectively
passing through the plurality of horn parts merge at a common throat having a cross sectional
area larger than the cross sectional area of the throats of the respective horns and then released
from the horn outlet. The cross-sectional area of the horn outlet can be set to substantially the
same size as the conventional one, so that the generation of wind noise due to the horn having a
plurality of horn portions is suppressed to suppress the deterioration of the acoustic
characteristics. be able to.
[0014]
In the back load horn of the above embodiment, the plurality of horn portions are preferably
arranged to be symmetrical with each other.
This back load horn is provided with a plurality of horn portions arranged so that the horns are
substantially symmetrical to each other, whereby the acoustic load acting on each of the plurality
of speaker units is approximately the same size. This can further suppress the occurrence of a
rolling phenomenon or the like when the speaker unit is driven.
[0015]
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In the back load horn of the above embodiment, the horn preferably includes a plurality of first
partition plates and a second partition plate, and the first partition plate and the second partition
plate are preferably arranged to face each other.
When the horn includes a plurality of first partition plates and second partition plates, the crosssectional area of the throat formed by the first partition plates and the second partition plates
can be adjusted.
By adjusting the cross-sectional area of the throat, it is possible to adjust the sound pressure
frequency characteristics of the back load horn.
[0016]
Further, in the back load horn of the embodiment, it is preferable that the cross-sectional area of
the throat formed between the first partition plate and the second partition plate be smaller than
the area of the diaphragm of the speaker unit. .
In general, it is said that, in the horn speaker, the efficiency increases and the reproduction band
widens as the area ratio between the area of the diaphragm and the cross-sectional area of the
throat portion of the horn increases. The air is compressed at each horn by narrowing the crosssectional area of the throat connected to the horn inlet of each horn to the required area ratio to
the area of the diaphragm of the speaker unit. Thus, the efficiency of sound reproduction can be
improved and the reproduction band can be expanded.
[0017]
Furthermore, in the back load horn according to the embodiment, the throat preferably includes
a turnback portion, and a cross-sectional area of the turnback portion is preferably substantially
equal to a cross-sectional area of the throat other than the turnback portion.
This back load horn has a throat having a folded portion, and the cross sectional area of the
folded portion of the throat is substantially the same as the cross sectional area of the throat
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other than the folded portion, particularly the cross sectional area of the throat near the folded
portion. Therefore, the cross-sectional area does not change rapidly at the folded portion of the
throat, and the generation of wind noise due to the rapid change of the cross-sectional area is
suppressed.
[0018]
Furthermore, in the back load horn of the embodiment, it is preferable to dispose a fourth
partition plate between the horn portions disposed at substantially symmetrical positions.
In this back load horn, even if a slight phase shift occurs between the sound waves passing
through each horn portion, the above-mentioned sound wave can be generated with almost no
phase shift by arranging the fourth partition plate. It can be merged. In addition, the positions of
the end portions of the fourth partition plate can be arbitrarily set, and the merging positions of
the sound waves passing through the respective horn portions can be merged without causing a
phase shift.
[0019]
Furthermore, in the back load horn of the embodiment, it is preferable that a reflector is disposed
on the front side of the speaker unit, and the reflector has a plurality of perforations. In this back
load horn, sound waves output from the front side of the speaker unit are emitted to the front
side of the back load horn H through the perforations of the reflector plate, but from this time
each speaker unit A part of the sound wave to be output is reflected by the portion other than the
perforated portion of the reflection plate 5 to the speaker unit side, and so-called acoustic
resistance acts on the diaphragm of each speaker unit.
[0020]
By this acoustic resistance, the diaphragm of each speaker unit is prevented from vibrating with
an amplitude larger than the predetermined amplitude, and the speaker unit can exhibit desired
acoustic characteristics.
[0021]
FIG. 1 is a front view showing one example of an embodiment of a back load horn according to
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the present invention, FIG. 2 is a side view, and FIG. 3 is a perspective view showing an internal
structure in a state where a front panel is removed.
[0022]
In FIGS. 1 to 3, the cabinet 1 of the back load horn H has a thin box shape whose front shape is
rectangular and whose depth is smaller than the vertical and horizontal lengths.
[0023]
In the following description, the short direction of the front shape of the cabinet 1 is referred to
as the vertical direction, and the longitudinal direction is referred to as the horizontal direction.
[0024]
In the cabinet 1 of this back load horn H, at the side part on the left side in FIG. 1, two speaker
units P are longitudinally located at symmetrical positions across a center line c parallel to the
longitudinal direction of the cabinet 1 , And are attached to the back plate of the cabinet 1 with
the front facing the front side (the front side of the paper surface) of the cabinet 1.
[0025]
The horn 2 is formed on the right side in FIG. 1 with respect to the arrangement position of the
speaker unit P in the cabinet 1.
The horn 2 includes two horns of a first horn 2A and a second horn 2B configured to be
symmetrical with respect to a center line c.
[0026]
The horn 2 is formed of various partition plates as described below.
[0027]
That is, in the cabinet 1, the two vertically extending first vertical partition plates 3A at the right
side positions of the two speaker units P in FIG. They are arranged in series in the vertical
direction so as to face each other at intervals and to be symmetrical with respect to each other
with respect to the center line c.
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[0028]
The respective inner end portions of the two first vertical partition plates 3A are arranged to face
each other with a predetermined space therebetween in the longitudinal direction across the
center line c. An opening formed between the inner ends of the partition plate 3A constitutes a
horn inlet h1.
[0029]
The outer end portions of the first vertical partition plates 3A are located at predetermined
intervals with respect to the lateral side walls 1A of the cabinet 1, respectively.
Then, between the outer end portion of each first vertical partition plate 3A and the side wall 1A
of the cabinet 1, two first diagonal direction partition plates 3B are disposed.
Each of the two first diagonal partition plates 3B is opposite to the speaker unit P by a required
angle (for example, 45 °) with respect to the longitudinal direction from the outer end of the
first vertical partition plate 3A (right side in FIG. 1) ) So that both ends are connected to the outer
end of the first vertical partition plate 3A and the side wall 1A of the cabinet 1 and in a
symmetrical position across the center line c. It is arranged.
[0030]
The second vertical partition plate 3C of one sheet is required for the first vertical partition plate
3A at a position (right side in FIG. 1) opposite to the speaker unit P with respect to the two first
vertical partition plates 3A. It extends in a parallel direction (longitudinal direction) at intervals,
and both ends are symmetrical with respect to the center line c than the outer end of the
opposing first vertical partition plate 3A with respect to the center line c. It is arranged to be in
position.
[0031]
The two first horizontal partition plates 3D are located at symmetrical positions across the center
line c on the opposite side (right side in FIG. 1) with respect to the speaker unit P than the second
vertical partition plate 3C. It is arranged.
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[0032]
Each of the first horizontal partition plates 3D is disposed opposite to the side opposite to the
speaker unit P from the position where the first diagonal partition plate 3B of the side wall 1A of
the cabinet 1 is connected. With respect to 1A, the end on the speaker unit P side is located at a
position spaced apart from the side wall 1A of the cabinet 1 and the direction away from the
speaker unit P (right direction in FIG. 1) As the distance between the side wall 1A and the side
wall 1A gradually increases, the side wall 1A extends in a slightly inclining direction.
[0033]
Between the end (the end on the left side in FIG. 1) of the first horizontal partition plate 3D on
the speaker unit P side and the end of the second vertical partition plate 3C, they are
substantially symmetrical with respect to each other with respect to the center line c. The two
second diagonal partition plates 3E are arranged so as to be in the proper position.
[0034]
Each of the second diagonal partition plates 3E is parallel to the first diagonal partition plate 3B
facing each other at a predetermined interval (a speaker unit P at a predetermined angle with
respect to the vertical direction). And both ends are connected to the respective ends of the first
horizontal partition 3D and the second vertical partition 3C.
[0035]
A center line c is mutually opposed at a position spaced apart in the lateral direction from the
end (right end in FIG. 1) 3Da on the opposite side to the speaker unit P side of each first
horizontal partition plate 3D. Two third vertical partition plates 3F are disposed so as to be
substantially symmetrical with respect to each other.
[0036]
Each of the third vertical partitions 3F extends in the vertical direction, and the outer end is
connected to the end (right end in FIG. 1) of the side wall 1A of the cabinet 1 opposite to the
speaker unit P. And the inner end portions of the two third longitudinal partition plates 3F are
formed so as to face each other with a predetermined distance therebetween in the longitudinal
direction across the center line c. The horn outlet h2 is configured by the opening portion.
[0037]
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Two second horizontal partition plates 3G are disposed on the inner side of the two first
horizontal partition plates 3D so as to be substantially symmetrical with each other with respect
to the center line c.
The two second horizontal partition plates 3G are longitudinally separated between the speaker
unit P and the opposite end (the right end in FIG. 1) with the right end of the first horizontal
partition plate 3D. The two second horizontal partition plates 3G are further spaced apart from
each other by a required distance, and further, the first horizontal partition plate 3D is moved in
the direction (left direction in FIG. 1) of the speaker unit P side. To the horn outlet h2 so that the
spacing between them gradually spreads from the side of the speaker unit P toward the horn
outlet h2.
[0038]
Then, the end (left end in FIG. 1) 3Ga of each second horizontal partition plate 3G on the speaker
unit P side is positioned at a predetermined interval with respect to the opposing second vertical
partition plate 3C. ing.
[0039]
Between the end (the end on the right side in FIG. 1) of the speaker unit P of each second
horizontal partition 3G and the inner end of the third vertical partition 3F, the center line c The
two third diagonal direction partition plates 3H are disposed so as to be substantially
symmetrical with respect to each other.
[0040]
Each of the third diagonal direction partition plates 3H is disposed on the side of the speaker unit
P (left side in FIG. 1) by a required angle (for example, 45 °) from the inner end of the third
vertical partition plate 3F with respect to the longitudinal direction. It extends in an inclined
direction, and both ends are connected to the respective ends of the third vertical partition 3F
and the second horizontal partition 3G.
[0041]
Between the two second horizontal partition plates 3G, a single third horizontal partition plate 3I
located on the center line c and extending along the central line c is disposed.
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The third horizontal partition plate 3I has an end on the side of the speaker unit P (an end on the
left side in FIG. 1) connected to the center position of the second vertical partition plate 3C. An
end (right end in FIG. 1) 3Ia is positioned in the cabinet along the center line c from the horn
outlet h2.
[0042]
The horn portion 2 has a first horn portion 2A at the upper side and a second horn portion 2B at
the lower side in FIG. 1 with respect to the center line c, and the horn outlet h2 is the first horn
portion 2A and the first horn portion 2A. 2 The horn unit 2B is shared.
[0043]
The first and second vertical partition plates 3A and 3C and the first vertical partition plate 3C
and the second vertical partition plate 3C are provided in the first and second horn portions 2A
and 2B, respectively. The first throat portion s1 having a cross-sectional area smaller than the
area of the diaphragm of the speaker unit P is formed by setting the distance between the two.
[0044]
Furthermore, a second throat portion s2 communicating with the first throat portion s1 is formed
between the first oblique direction partition plate 3B and the second oblique direction partition
plate 3E, and the cross-sectional area of the second throat portion s2 is The distance between the
first diagonal partition plate 3B and the second diagonal partition plate 3E is set to be
approximately the same size as the first throat portion s1.
[0045]
A third throat portion s3 communicating with the second throat portion s2 is formed between
the first horizontal partition plate 3D and the side wall 1A of the cabinet 1, and the crosssectional area of the third throat portion s3 is the first horizontal partition By setting the distance
between the plate 3D and the side wall 1A, the end (on the left side in FIG. 1) of the speaker unit
P is set to have substantially the same size as the cross-sectional area of the second throat
portion s2. The speaker unit P is set to be gradually larger as it goes to the opposite side (left
side in FIG. 1).
[0046]
A fourth throat portion s4 communicating with the third throat portion s3 is formed between the
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end portion 3Da of the first horizontal partition plate 3D and the third vertical partition plate 3F
and the third diagonal direction partition plate 3H. By setting the distance between the end 3Da
of the horizontal partition plate 3D and the third vertical partition plate 3F and the third diagonal
partition plate 3H, the cross-sectional area at each position along the axis of the fourth throat
portion s4 is The three throat portions s3 are set so as not to largely fluctuate with respect to the
cross-sectional area at the end portion opposite to the speaker unit P.
[0047]
A fifth throat portion s5 in communication with the fourth throat portion s4 is formed between
the second horizontal partition plate 3G and the first horizontal partition plate 3D, and the crosssectional area of the fifth throat portion s5 is the second horizontal portion. By setting the
distance between the partition plate 3G and the first horizontal partition plate 3D, the crosssectional area of the fourth throat portion s4 is approximately equal to that near the end (right
end in FIG. 1) opposite to the speaker unit P. The same size is set so as to increase gradually as it
goes to the speaker unit P side (left side in FIG. 1).
[0048]
A sixth throat portion s6 communicating with the fifth throat portion s5 between the end 3Ga of
the second horizontal partition plate 3G on the speaker unit P side and the second oblique
partition plate 3E and the second vertical partition plate 3C Are formed, and by setting the
distance between the end 3Ga of the second horizontal partition 3G and the second diagonal
partition 3E and the second vertical partition 3C, each along the axis of the sixth throat portion
s6. The cross-sectional area at the position is set so as not to largely fluctuate with the crosssectional area at the end of the fifth throat portion s5 on the speaker unit P side.
[0049]
A seventh throat portion s7 communicating with the sixth throat portion s6 is formed between
the third horizontal partition plate 3I and the second horizontal partition plate 3G, and the crosssectional area of the seventh throat portion s7 is the third horizontal portion. By setting the
distance between the partition plate 3I and the second horizontal partition plate 3G, the end (on
the left side in FIG. 1) of the speaker unit P has substantially the same size as the cross-sectional
area of the sixth throat portion s6. The speaker unit P is set to be gradually larger as it goes to
the opposite side (right side in FIG. 1).
[0050]
And between the end 3Ia on the opposite side of the speaker unit P of the third horizontal
partition plate 3I and the horn outlet h2, both of the seventh throat portion s7 on the first horn
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portion 2A side and the second horn portion 2B side And an eighth throat portion s8 shared with
the first horn portion 2A and the second horn portion 2B is formed, and the cross-sectional area
of the eighth throat portion s8 is the first horn portion 2A side and the second horn portion By
setting the distance between the two second horizontal partition plates 3G on the 2B side, at the
end on the speaker unit P side (the left end in FIG. 1), the cross section of the seventh throat
portion s7 is almost twice as large. The size is set so as to gradually increase in the direction of
the horn outlet h2 (rightward in FIG. 1).
[0051]
An amplifier 4 is attached to the left side of the cabinet 1 (in FIG. 1), and external connection
terminals such as a power supply and a signal input terminal (not shown) are disposed on the left
side wall 1C of the cabinet 1.
[0052]
The front panel 1B fixed to the cabinet 1 is covered on the front face of the portion where the
horn portion 2 of the cabinet 1 is configured so that there is no sound leakage from other than
the horn inlet h1 and the horn outlet h2.
[0053]
Then, on the front surface of the portion to which the speaker unit P of the cabinet 1 is attached,
a reflecting plate 5 having a large number of perforations 5a formed over the entire surface is
attached, and two speaker units P are covered. There is.
[0054]
The number 5 of the perforations 5a of the reflector 5 is such that the value (ratio) of the total
area divided by the total area of the reflector 5 exerts the desired acoustic resistance on the
diaphragm of the speaker unit. The opening area is set.
[0055]
In the back load horn H configured as described above, sound waves output from the front sides
of the two speaker units P are emitted to the front side of the back load horn H through the
perforations 5 a of the reflection plate 5.
[0056]
At this time, a part of the sound wave output from each speaker unit P is reflected toward the
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speaker unit P by a portion other than the portion where the perforations 5a of the reflection
plate 5 are formed, and each component is a so-called acoustic resistance. A load is applied to the
diaphragm of the speaker unit P.
[0057]
In this back load horn H, the diaphragm of each speaker unit P is prevented from vibrating with
an amplitude larger than a predetermined amplitude by this acoustic resistance, so the opening
efficiency by the perforations 5 a of the reflection plate 5 is required. By setting the value, a
desired acoustic characteristic can be exhibited.
[0058]
The sound waves output from the back side of the two speaker units P are respectively arranged
from the horn inlet h1 of the horn 2 so as to be substantially symmetrical with respect to the
center line c and the first horn portion 2A and the second horn After being divided into parts 2B
and passing through these horn parts, they are joined at the eighth throat part s8 provided in
front of the horn outlet h2, and the horn formed on the side surface of the cabinet 1 through the
eighth throat part s8 It is emitted from the exit h2.
[0059]
As described above, when the back load horn H includes two speaker units P, when the same
sound pressure as that of the back load horn including one speaker unit is obtained, the back
load horn H The amplitude and diameter of the contact can be reduced, and as the speaker unit P
is made thinner, the cabinet 1 of the back load horn H can be made thinner than before, and the
thickness and thickness of the conventional cabinet are In the same case, the obtained sound
pressure can be increased compared to the prior art.
[0060]
The back load horn H corresponds to the two speaker units P disposed so as to be substantially
symmetrical with respect to the center line c, and the horn 2 has the center line c in the cabinet
1. By providing the two horns of the first horn 2A and the second horn 2B having a symmetrical
structure sandwiching each other, the same acoustic load acts on each speaker unit P, so that the
speakers・ The occurrence of a so-called rolling phenomenon or the like in which the vibrating
portion of the speaker tilts while being driven is suppressed while driving the unit P, and the
voice coil of the speaker unit P contacts the magnetic gap by the rolling phenomenon and noise
is generated. It is possible to suppress the deterioration of the acoustic characteristics due to the
generation or the like.
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[0061]
On the other hand, in the case where only one horn unit 12 is provided in the cabinet 10 with
respect to the two speaker units P, as shown in FIG. 4 for example, each speaker unit P Since the
correspondence with the structure of the horn unit 12 does not have a symmetrical positional
relationship as in the case of the back load horn H, the acoustic load on each of the speaker units
P is different, and the acoustic characteristic is different from that of the speaker unit P. There is
a tendency to decrease due to the generation of abnormal noise due to the rolling phenomenon
that occurs when driving the
[0062]
In the back load horn H, since the two systems of the first horn portion 2A and the second horn
portion 2B provided in the horn 2 share the eighth throat portion s8 located on the front side of
the horn outlet h2, the horn When the throat portion at the outlet portion is provided separately
and separately for each speaker unit P, the cross-sectional area of each throat portion is reduced
to easily generate wind noise, while the eighth throat portion s8 The cross-sectional area of can
be set to substantially the same size as the conventional one, and the generation of wind noise
due to the provision of the two horns can be suppressed, and the deterioration of the acoustic
characteristics can be suppressed.
[0063]
Here, the sound pressure frequency characteristic does not appear in the sound pressure
frequency characteristic as to which position on the front side of the horn outlet h2 the sound
waves respectively passing through the two systems of the first horn unit 2A and the second
horn unit 2B are merged However, it has been found that the acoustic characteristics are
affected.
[0064]
This is because even if the first horn portion 2A and the second horn portion 2B of the horn 2
are configured to have a symmetrical structure, the phases slightly shift while the sound waves
pass through the respective throat portions. It is considered to be.
[0065]
Therefore, in the back load horn H, the third horizontal partition plate 3I is disposed between the
two second horizontal partition plates 3G, and the position of the end 3Ia of the third horizontal
partition plate 3I is set to the required position. By setting, the sound waves having respectively
passed through the first horn 2A and the second horn 2B are joined together in the state where
02-05-2019
15
there is no phase shift.
[0066]
The second vertical partition plate 3C of the horn 2 of the back load horn H is a compression
plate for the improvement of the output sound pressure and the reduction of the wind noise.
That is, in general, in the horn speaker, if the area ratio (the area of the diaphragm / the crosssectional area of the throat) of the so-called "diaphragm ratio" between the area of the diaphragm
and the cross-sectional area of the throat increases, the efficiency is increased. It is said that the
higher the frequency, the wider the reproduction band.
[0067]
In the back load horn H, the cross-sectional area of the first throat portion s1 formed between
the second vertical partition plate 3C and each first vertical partition plate 3A corresponds to
that of the speaker unit P by the second vertical partition plate 3C. The diaphragm is narrowed
so as to have a required aperture ratio with respect to the area of the diaphragm.
[0068]
As a result, the back load horn H receives an input from the horn inlet h1 and the sound waves
separated into the first horn portion 2A and the second horn portion 2B are compressed by the
second vertical partition plate 3C at the first throat portion s1, respectively. Therefore, the
acoustic characteristics can be improved by the improvement of the efficiency and the expansion
of the reproduction band as described above.
[0069]
The sound wave compressed in the first throat portion s1 passes through the second throat
portion s2 having substantially the same cross-sectional area as the first throat portion s1, and
the third throat portion s3-fourth throat portion s4-fifth throat portion The sound waves having
passed through the s5-sixth throat portion s6-seventh throat portion s7 sequentially pass, and in
the eighth throat portion s8, the sound waves having respectively passed through the first horn
portion 2A and the second horn portion 2B merge, and from the horn outlet h2 It is emitted.
[0070]
02-05-2019
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At this time, the third throat portion s3 and the fifth throat portion s5, the sixth throat portion s6,
and the seventh throat portion s7 have a rapid cross-sectional area because the cross-sectional
area gradually increases toward the downstream side. It is possible to suppress the generation of
wind noise due to the change of.
Further, the fourth throat portion s4 is connected to the third throat portion s3 and the fifth
throat portion s5 by the third diagonal partition plate 3H so that the change in sectional area is
minimized, and further, The sixth throat portion s6 is connected to the fifth throat portion s5 and
the seventh throat portion s7 by the second diagonal partition plate 3E so as to minimize the
change in the cross-sectional area. The generation of wind noise in the folded portion of the
throat portion is suppressed.
[0071]
The back load horn of the above embodiment includes a cabinet, a speaker unit and a horn, and a
plurality of speaker units are provided in contact with the cabinet, and the horns are throats
respectively corresponding to the respective speaker units. The horn inlet common to each horn
is provided at a position adjacent to a plurality of speaker units, and the throat of each horn is
connected to the horn inlet, and the outer wall of the cabinet is provided. The back load horn of
the embodiment in which the horn outlet common to each horn portion is provided at any
position of the portion is taken as an embodiment of the upper concept.
[0072]
In the back load horn of the embodiment constituting the upper concept, sound waves output
from the back side of the plurality of speaker units are dispersed to each of the plurality of horn
portions from the horn inlet when the back load horn is driven. After passing the section, it is
emitted from the horn outlet.
[0073]
According to the back load horn of this embodiment, when a plurality of speaker units are
provided, the same sound pressure as that of the back load horn having one speaker unit can be
obtained. The amplitude and aperture can be reduced, and as the speaker unit becomes thinner,
the cabinet of the backload horn can be made thinner than before, and when the thickness is the
same as that of the conventional cabinet This makes it possible to increase the obtained sound
pressure as compared to the conventional backload horn.
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[0074]
In addition, by providing a shared throat between the throat and the horn outlet connected to the
horn inlet, the cross-sectional area of the horn outlet can be set to approximately the same size as
a conventional backload horn, so a plurality of horns are provided. The generation of wind noise
due to the provision of the individual horn portions can be suppressed, and the deterioration of
acoustic characteristics can be suppressed.
[0075]
And, by providing the horns with the same number of horns in the cabinet corresponding to a
plurality of speaker units, it becomes possible to make the acoustic load acting on each speaker
unit approximately the same size. Therefore, when the speaker unit is driven, the occurrence of
the so-called rolling phenomenon or the like in which the speaker's vibrator (including the
diaphragm, edge, voice coil, voice coil bobbin, etc.) vibrates while tilting obliquely is suppressed
to reduce the acoustic characteristics. It can be deterred.
[0076]
Furthermore, the sound waves dispersed and passed through the plurality of horns are joined at
a common throat having a cross-sectional area larger than the cross-sectional area of the throats
of the respective horns, and then emitted from the horn outlet.
Therefore, in the case of a back load horn in which a horn outlet is provided for each horn
portion, a wind noise is easily generated by reducing the cross-sectional area of the horn outlet,
whereas in the embodiment described above, the horn outlet Since the cross-sectional area of can
be set to substantially the same size as in the prior art, it is possible to suppress the generation of
wind noise caused by the horn having a plurality of horn portions and to suppress the
deterioration of the acoustic characteristics.
[0077]
It is a front view showing one example in an embodiment of this invention.
It is a side view of the example.
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It is a perspective view which shows the internal structure of the Example.
It is a comparison figure for demonstrating the effect of this invention.
Explanation of sign
[0078]
DESCRIPTION OF SYMBOLS 1 ... Cabinet 1A ... Side wall 2 ... Horn 2A ... 1st horn part (horn part)
2B ... 2nd horn part (horn part) 3A ... 1st longitudinal partition plate (1st partition plate) 3B ... 1st
diagonal direction partition plate (Third partition) 3C: Second vertical partition (second partition)
3D: First horizontal partition 3E: Second diagonal partition (third partition) 3F: Third vertical
partition 3G: Third 2 Horizontal partition plate 3H ... 3rd diagonal direction partition plate (3rd
partition plate) 3 I ... 3rd horizontal partition plate (4th partition plate) 3 Ia ... end 5 ... Reflective
plate 5a ... Perforation (perforation part) H ... Back load Horn P: speaker unit h1: horn inlet h2:
horn outlet s1: first throat portion (linear portion) s2: second throat portion (folded portion) s3:
third throat portion (linear portion) s4: fourth throat portion (Folded part) 5 ... 5 throat portion
(straight portion) s6 ... sixth throat portion (folded portion) s7 ... 7th throat portion (straight
portion) s8 ... eighth throat portion (Shared throat)
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19
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