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JP3213453

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DESCRIPTION JP3213453
Abstract: [Problem] To provide a speaker housing capable of easily suppressing howling. A
housing for a speaker, in which sound paths are formed by a plurality of substantially
rectangular sound path plates, wherein at least one of the plurality of sound path plates is a
corner of the sound path plate. It is characterized in that it is chamfered. [Selected figure] Figure
1
Speaker housing
[0001]
The present invention relates to a speaker case, and more particularly to a back load horn type
speaker case.
[0002]
BACKGROUND ART Conventionally, a back load horn type speaker device has been used as a
speaker device that can be easily manufactured by itself and can efficiently reproduce a low tone
range.
[0003]
In the back load horn type speaker device, the inside of the housing is divided into multiple folds
by a plurality of rectangular sound path plates or plates called diaphragms, and the sound is
generated from the rear surface of the speaker unit. A passage (sound passage) is made.
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The sound passage is designed to gradually expand in cross-sectional area, and the sound
generated from the rear surface of the speaker unit is output to the outside through the sound
passage.
[0004]
As such a back load horn type speaker device, Patent Document 1 uses a plate having a thickness
that does not vibrate with sound waves having a frequency higher than 300 Hz as a sound path
plate, and an actuator for this sound path plate Back-loaded horn-type speaker devices are
described.
With such a configuration, it is possible to enhance the low frequency range output from the
speaker unit by controlling the vibration state of the sound path plate with the actuator even
with a small housing.
[0005]
Patent No. 6052718
[0006]
However, in the back load horn type speaker device as disclosed in Patent Document 1, when the
sound wave passes through the internal sound passage, the specific frequency of the sound wave
forms the natural frequency of the sound path plate forming the sound passage. There is a risk
that resonance will occur and howling may occur.
[0007]
Also, normally, a sound passage is formed by bonding a plurality of rectangular parallelepiped
(hexahedron) sound path plates vertically or horizontally with an adhesive. In such a sound
passage, the sound passages face each other in parallel. The larger the area of the surface, the
more pronounced the resonance described above.
[0008]
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In addition, the characteristic frequency of the sound passage portion also changes in a complex
manner as the position of the sound path plate slightly changes due to the drying of the adhesive.
Then, once the speaker device is assembled, internal processing can not be performed, which
makes it difficult to control and suppress howling.
[0009]
This invention is made in view of the above actual condition, and makes it a subject to provide a
housing for speakers which can control howling simply.
[0010]
In order to solve the above problems, the present invention is a speaker cabinet in which sound
passages are formed by a plurality of substantially rectangular sound path plates, and at least
one of the plurality of sound path plates. The chamfering process is given to the corner part of
the sound path board of this.
[0011]
According to the present invention, the shape of one sound path plate is 7 faces or more, and the
area of the faces facing in parallel to the sound path is reduced.
As a result, the sound wave and the one sound path plate hardly resonate, and it becomes
possible to suppress howling inside the speaker housing.
[0012]
In a preferred embodiment of the present invention, at least one corner of the one sound path
plate is chamfered.
[0013]
With such a configuration, the sound wave and the one sound path plate are less likely to
resonate by a simple operation of processing at least one corner, so that howling in the speaker
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housing can be suppressed. It becomes possible.
[0014]
A preferred embodiment of the present invention is characterized in that all corners of the one
sound path plate are chamfered.
[0015]
With such a configuration, the shape of one sound path plate becomes a tetrahedron, and the
area of the faces facing in parallel to the sound paths is further reduced.
This makes it possible to further suppress howling inside the speaker housing.
[0016]
In a preferred embodiment of the present invention, at least one corner portion of the plurality of
sound path plates is chamfered.
[0017]
With such a configuration, the shapes of the plurality of sound path plates become seven faces or
more, and the area of the faces facing in parallel to the sound paths decreases.
As a result, the sound wave and the entire sound passage hardly resonate, and it becomes
possible to suppress the occurrence of howling inside the speaker housing.
[0018]
A preferred embodiment of the present invention is characterized in that all corners of the
plurality of sound path plates are chamfered.
[0019]
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With such a configuration, the shape of the plurality of sound path plates becomes a tetrahedron,
and the area of the faces facing in parallel to the sound paths is further reduced.
This makes it possible to further suppress the occurrence of howling inside the speaker housing.
[0020]
In a preferred embodiment of the present invention, the chamfering length of the chamfering
process applied to the corner portion is designed to be between 1 mm and 5 mm.
[0021]
With such a configuration, it is possible to form a sound path board of an optimum shape that
enables clear sound quality reproduction without causing howling even if the volume of the
reproduced sound from the speaker unit is large. Is possible.
[0022]
ADVANTAGE OF THE INVENTION According to this invention, the housing | casing for speakers
which can suppress a howling simply can be provided.
[0023]
1 is a schematic perspective view of a speaker housing according to an embodiment of the
present invention.
It is a figure which shows the sound path board used for the housing for speakers which
concerns on embodiment of this invention, Comprising: (a) A perspective view, (b) It is a top view.
It is an AA line sectional view of a housing for speakers concerning an embodiment of the
present invention.
[0024]
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Hereinafter, a housing for a speaker according to an embodiment of the present invention will be
described using the drawings.
The embodiment described below is an example of the present invention, and the present
invention is not limited to the following embodiment.
[0025]
As shown in FIG. 1, the speaker housing 1 according to the embodiment of the present invention
includes a front plate 11, a top plate 12, a bottom plate 13, a back plate 14, and left and right
side plates 15 and 16. The whole is roughly configured in a substantially rectangular box shape.
The housing 1 for a speaker is formed of a plate material cut out of wood, a plywood, a wood
board made of resin such as wood chips such as wood chips, or the like.
In addition, as long as it is a material having a strength that can be applied as a housing for a
speaker, a material other than a wood material may be used.
[0026]
Further, a speaker unit mounting hole 111 to which a speaker unit is attached is formed in the
upper part of the front plate 11, and an outlet 112 of a sound passage P described later is
formed in the lower part.
[0027]
As shown in FIG. 2, the sound path plate B used to form the sound passage P has a substantially
rectangular parallelepiped shape, and chamfering is applied to all eight corner portions c.
[0028]
As shown in FIG. 2 (a), the sound path plate B is formed of a plate having a thickness of about 10
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mm and a width of about 80 mm, and like the housing 1 for a speaker, plate material, plywood or
wood chip cut from wood It may be formed by a wood board etc. which molded wood fibers, such
as resin, with resin, and may be formed by materials other than wood.
Also, the height h is arbitrarily changed and used to design the desired sound path P.
The thickness t and the width w are not limited to the above-described values, and can be
arbitrarily changed in accordance with the size of the speaker housing 1.
[0029]
As shown in FIG. 2 (b), all corner portions c of the sound path plate B are chamfered at a
chamfering angle of 45 degrees and a chamfering length d of about 3 mm.
The chamfering angles and the chamfering lengths of all the corner portions c do not necessarily
have to be the same, and for each corner portion c, chamfering may be performed with different
chamfering angles and chamfering lengths.
[0030]
As shown in FIG. 3, a sound passage P through which sound waves output from the rear surface
of the speaker unit are formed is formed inside the speaker housing 1 by a plurality of sound
path plates B.
Further, a cable insertion hole for passing a cable for electrically connecting the speaker unit is
formed in the upper part of the back plate 14.
[0031]
The sound passage P is configured to gradually expand in cross section as it goes to the outlet
112.
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[0032]
The sound path plates B are only joined vertically or horizontally using joining means such as an
adhesive.
That is, in the speaker housing 1 according to the present embodiment, there is no need to
design a complicated sound passage P in which the surfaces facing in parallel are not formed as
much as possible, and the productivity is improved.
[0033]
Also, the acoustic characteristics inside the speaker enclosure 1 are not influenced by the
number of connected sound path plates B.
For this reason, the shape and the total length of the sound passage P are not limited to those
shown in FIG. 3 and can be freely changed according to the number of connected components.
[0034]
According to the present embodiment, in the inside of the speaker housing 1, the chamfering is
applied to the corner portion c of at least one of the sound path plates B among the plurality of
sound path plates B that form the sound path P. Then, the shape of one sound path plate B
becomes a heptahedron or more, and the area of the faces facing in parallel to the sound path P
decreases. As a result, the sound wave and the one sound path plate B do not easily resonate, and
it becomes possible to suppress howling inside the speaker housing 1.
[0035]
In addition, by chamfering all corners c of one sound path plate B, the shape of one sound path
plate B becomes a tetrahedron, and the area of the faces facing in parallel to the sound passage P
is It decreases further. This makes it possible to further suppress howling inside the speaker
housing 1.
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[0036]
Further, by chamfering all the corners c of the plurality of sound path plates B, the shapes of the
plurality of sound path plates B become 14 faces, and the area of the faces facing in parallel in
the sound path P is It decreases further. As a result, the sound wave and the entire sound
passage P do not easily resonate, and howling inside the speaker housing 1 can be further
suppressed.
[0037]
In addition, by designing the chamfering length of the chamfering process applied to the corner c
between 1 mm and 5 mm, howling occurs inside the speaker housing 1 even if the volume of the
reproduced sound from the speaker unit is large. It is possible to form the sound path board B of
the optimum shape which enables reproduction with clear sound quality without causing
[0038]
The shapes, dimensions, and the like of the constituent members shown in the embodiment are
merely examples, and various changes can be made based on design requirements and the like.
[0039]
1 Speaker housing 11 Front plate 111 Speaker unit mounting hole 112 Exit 12 Top plate 13
Bottom plate 14 Back plate 141 Cable insertion holes 15, 16 Side plate P Sound passage B Sound
path plate c Corner
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