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JPH0582190

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DESCRIPTION JPH0582190
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
cabinet for a speaker apparatus for phase inversion type or acoustic transformer type for the
purpose of improving the reproduction sound quality, particularly in a speaker apparatus
exclusively for ultra low frequency reproduction. about
[0002]
2. Description of the Related Art As a conventional speaker device for the purpose of increasing
the low-frequency reproduction capability, there are many speaker devices provided with a
phase-reversal cabinet (not shown) as is well known. For a speaker device intended only for lowfrequency reproduction, for example, as shown in a cross section in FIG. 5, the inside of the
cabinet 11 and the first space A on the back of the speaker by the partition plate 13 having the
speaker 14 attached to the hole 13a. The second space B is divided into a second space B on the
front of the speaker, the first space A is usually sealed, and the second space B is provided with a
duct 12 communicating with the external space of the cabinet 11. A so-called acoustic
transformer type cabinet is used which radiates from the duct 12 through the second space B.
[0003]
In the conventional cabinet for a speaker device having such a structure, although a paper tube
or a molded product made of a synthetic resin is generally used as a duct, a resin molded product
is expensive, Moreover, the duct which cut ¦ disconnected the paper pipe had the fault that the
operation ¦ work for attaching to a cabinet was difficult, and workability was very bad.
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[0004]
Moreover, the duct formed of such a hard material collides with the air flow at the edge of the
duct, particularly when the volume velocity of the duct portion is increased as in the lowfrequency reproduction dedicated speaker device. There is a problem to be solved that wind
noise is generated and the reproduced sound quality is degraded as noise.
[0005]
Therefore, the present invention solves the disadvantages of the prior art and uses an easy-toinstall duct structure made of a foamed foam having flexibility, so that the speaker can be
assembled easily and has high performance. The purpose is to provide a cabinet for the device.
[0006]
The cabinet for a phase-reversal type speaker device according to the present invention for
achieving the above object will be described with reference to FIGS. 1 to 4 showing an
embodiment. In the first device, a cabinet 1 to which at least one or more speakers 4 are
attached, and an air vent 1a is formed in a part of a wall of the cabinet 1, and the internal space
of the cabinet 1 is connected to the air vent 1a. In a cabinet for a phase-reversal type speaker
device provided with a duct 2 communicating with an external space, a through hole 3 serving as
a sound path is formed in a flexible foamed resin mass and connected to the vent hole 1a. The
duct 2 of the above-described structure is adhesively disposed so as to be inscribed in the wall of
the cabinet 1 so as to occupy a part of the internal space of the cabinet 1.
[0007]
According to the second aspect of the invention, the inside of the cabinet 1 is divided into a first
space A behind the speaker 4 and a second space B ahead of the speaker 4 by a partition plate 5
in which the speaker 4 is mounted in the hole. The first space A is sealed, and a vent 1a
communicating the second space B to the external space is formed in the wall 1b of the cabinet 1
and the flexible foam resin mass is passed through. The cabinet 1 and the partition plate 5 are
arranged such that the duct 2 in which the through hole 3 serving as a sound path
communicating the second space B with the external space through the pores 1a is partially
occupied in the second space B. The cabinet for phase-reversal type speaker device is
characterized in that it is adhesively disposed inward.
[0008]
According to the third aspect of the present invention, there is provided a first space A at the rear
of the speaker 4 in which the inside of the cabinet 1 communicates with each other at the duct
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A6 by the partition plate 5 in which the speaker 4 and the duct A6 are attached to respective
holes. And the second space B in front of the speaker 4, the first space A is sealed, and a vent 1a
is formed in the wall 1b of the cabinet 1 to communicate the second space B portion to the
external space And a duct 2 in which a through hole 3 serving as a sound path communicating
the second space B with the external space through the air vent 1a in the flexible foamed resin
mass is formed in the second space B The phase-reversal type speaker device is adhesively
disposed so as to be inscribed in the cabinet 1 and the partition plate 5 so as to occupy a part of
the inside, and as a modification of the third invention, the duct A6 is It becomes a sound path to
the foamed foam having flexibility A phase inversion type speaker system, characterized in that it
is adhered arranged straddling the cabinet 1 and the partition plate 5 has a through hole 7 is
bored structure cabinet
[0009]
In the cabinet for a speaker device of such a configuration, since the duct 2 is made of a foamed
foamed resin mass having flexibility, the duct 2 is formed between the vent hole 1a and the wall
of the cabinet 1 or the cabinet 1 There is no problem even if there is a slight displacement
between mutually opposing walls, etc., or even if there are dimensional errors.
[0010]
Further, since the duct is formed in a massive form and is disposed between the partition plate 5
and the wall of the cabinet 1 so as to straddle them, it is extremely easy to fit the ducts 2 to 6
into place when assembling the speaker device. And easy to assemble.
[0011]
Furthermore, the large-sized and high-surface-area ducts 2 to 6 expand and contract by acoustic
pressure in the cabinet and absorb acoustic energy by mechanical internal loss, so that even if
the foamed resin mass does not have air permeability, In addition, when the foamed resin mass
has air permeability, of course, it exhibits a sound absorbing action, and contributes to the
improvement of the frequency characteristic and the transient characteristic.
[0012]
Furthermore, since the air flow is soft and does not disturb the air flow, it does not generate wind
noise and does not deteriorate the sound quality due to extra noise generation.
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 to 4, the
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embodiment of the present invention will be described in detail. FIG. 1 shows a cross section of
the first embodiment of the present invention. A speaker 4 is attached to the speaker hole 1c of
the wall 1b, and a vent 1a communicating with the outside of the cabinet is formed at a position
away from the speaker 4.
[0014]
FIG. 2 is a perspective view of the duct 2. For example, a through-hole 3 which is connected to
the vent hole 1a and becomes a sound path is drilled in a flexible foam resin mass such as closedcell foam urethane. The duct 2 having the same structure communicates the space inside the
cabinet 1 to the external space by the through holes 3 and the vent holes 1a, and is inscribed in
the wall of the cabinet 1 so as to occupy a part of the internal space of the cabinet 1. It is
arranged adhesively.
[0015]
[0015] Such a duct 2 is to cut, for example, a non-air-permeable closed-cell foamed urethane
resin block having an apparent density of about 30 kg / m 3 to a predetermined external
dimension, and punch the through hole 3 by a punch. Obtained by
[0016]
FIG. 3 shows a cross-section of the second embodiment of the present invention, and the inside of
the cabinet 1 is divided by the partition plate 5 and the speaker 4 mounted in the hole 5a of the
partition plate 5, It is divided into a space A of 1 and a second space B in front of the speaker 4.
[0017]
The first space A is sealed, and the second space B communicates with the outside through a vent
1a formed in the wall 1b of the cabinet 1.
[0018]
Inside of the second space B is a duct 2 in which a through hole 3 serving as a sound path
communicating the second space B with the external space through the air vent 1a is formed in a
flexible foamed resin mass. In a state in which the front plate of the cabinet 1 and the side plates
of the cabinet 1 and the lower surface of the partition plate 5 are inscribed, the adhesive is
disposed.
[0019]
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FIG. 4 shows a cross section of an embodiment of the third invention of the present application,
wherein a hole 5B is further provided in the partition plate 5 in the second invention
embodiment, and the first space A and the second space A are provided through the hole 5b. A
duct 6 is provided to mutually connect the space B, and the phase of the sound wave on the back
of the speaker 4 is inverted to be added to the space B on the front of the speaker, and this
enhanced bass is transmitted through the through hole 3 of the duct 2 from the vent 1a It is a
radiating structure.
[0020]
In the embodiment of FIG. 4, the duct 6 has a structure in which a through hole 7 serving as a
sound path is bored in a flexible foamed resin block like the duct 2, and the cabinet 1 and the
partition plate Although the structure is adhered and arranged straddling 5 and 5, instead of the
foam duct 6 described above, it is possible to have a structure in which a cylindrical duct known
in the related art is fixed to the partition plate 5 (shown in FIG. Omitted).
[0021]
In each of the above embodiments, a closed cell urethane foam resin having an apparent density
of 30 kg / m 3 was used as the flexible foam resin. According to the experimental results, this
foamed resin block is air permeable. Even in the case of open-cell foams having ductility, they
exhibit ducting action as long as they have a certain level of fluid resistance.
Generally, at least about 20 kg / m 3 of density is required for any form of foam, and if the
density is lower than this, the duct action becomes ambiguous and desired low band
characteristics can not be obtained.
[0022]
In addition, the installation of the duct inside the cabinet is easy even if there is a slight positional
deviation between the vent holes and the through holes, for example, by bonding while inserting
a rod-like guide into the through holes from the air holes. It can be installed on
Also, for cabinet processing and assembly convenience, the back cover of the back of the cabinet
can be removed and assembled after cabinet exterior processing. For example, when exterior
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processing of the cabinet is performed by spray coating etc., the duct opening inner surface is
coated with paint. It is advantageous because it does not contaminate.
[0023]
Although the cabinet for the phase inversion type speaker device according to the present
invention has been described in detail based on the embodiment considered to be representative,
the embodiment of the cabinet configuration according to the present invention is, for example, a
duct material. The present invention is not limited to the structure of the above embodiment, but
includes the constituent requirements described in the above-mentioned utility model
registration request, exhibits the effect according to the present invention, and appropriately
modifies it as long as it has the effects described below. Can be implemented
[0024]
[Effects] The cabinet for phase-reversal type speaker device according to the present invention
has the following effects (1) The duct 4 is made of a foamed resin block having flexibility and no
air permeability. It does not matter if the duct dimensions deviate slightly from the century
dimensions.
Therefore, high accuracy is not required for the duct component.
(2) The duct configuration is simple, the number of processing steps is small, and the foam resin
of the material is inexpensive.
Therefore, the cost reduction of parts price is possible.
(3) Since the duct is massive and disposed across the entire space between the partition plate and
the wall of the cabinet, the duct can be fitted in place when assembling the speaker device, thus
reducing the cost of parts. It is.
(3) Because the duct is massive and arranged across the entire space between the partition plate
and the wall of the cabinet, the duct can be very easily assembled by fitting and bonding the duct
in place when assembling the speaker device .
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Therefore, the improvement in productivity can reduce the manufacturing cost.
(4) A large, large surface area duct expands and contracts due to the acoustic pressure in the
cabinet and absorbs acoustic energy by internal loss, so even if the foamed resin mass is not air
permeable, or if the foamed resin mass has air permeability, Needless to say, they all exhibit a
sound absorbing action and contribute to the improvement of frequency characteristics and
transient characteristics.
[0025]
With the above advantages, it is possible to provide a low cost cabinet which can obtain a
speaker device with excellent performance.
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