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DESCRIPTION JP2006129460

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DESCRIPTION JP2006129460
PROBLEM TO BE SOLVED: To provide a speaker system which does not transmit vibration from a
cabinet to a member forming a duct. SOLUTION: A speaker system 100 comprises at least one
speaker unit 1, a first cabinet 4 to which the speaker unit 1 is attached, and a first opening 6 is
defined at a bottom surface, and the first cabinet 4. And a second cabinet 5 attached to the outer
periphery of the bottom and defining a second opening 8 on the front to form a bass reflex duct
7. A buffer 3 is disposed between the first cabinet 4 and the second cabinet 5. Therefore, it is
possible to prevent transmission of the vibration from the first cabinet 4 to the second cabinet 5
forming the bass reflex duct 7. [Selected figure] Figure 2
スピーカーキャビネットおよびスピーカーシステム
[0001]
The present invention relates to a speaker system, and more particularly to a speaker system
forming a bass reflex duct.
[0002]
In an ordinary bass reflex type speaker, an opening is formed in a speaker cabinet, and a
cylindrical bass reflex duct is attached to the opening.
The sound wave radiated from the back of the diaphragm of the speaker into the cabinet is
phase-reversed and radiated from the bass reflex duct to the outside to strengthen the bass.
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Further, as another bass reflex type speaker, there is proposed a loudspeaker in which a partition
plate is provided in a cabinet and a bass reflex duct is formed by a part of the cabinet and the
partition plate. In such a speaker, the movement of air in the duct vibrates the duct, so that the
vibration of the duct is transmitted to the cabinet. By transmitting the vibration of the duct to the
cabinet, unnecessary sound (harmonic component) is emitted. Since the harmonic component is a
component that affects the timbre, the timbre is different from the timbre of the reproduction
sound to be originally reproduced.
[0003]
On the other hand, by forming the cabinet with a relatively thin plate material or a plate material
for musical instruments, the cabinet itself is also vibrated according to the vibration of the
diaphragm, and the speaker provides the sound wave from the cabinet to the listener in addition
to the sound wave from the diaphragm. Proposed. When the above-described duct is adopted for
such a speaker, the duct vibrates due to the vibration of the cabinet, and an unnecessary sound
(harmonic component) is emitted. Specifically, when the harmonic component is radiated from
the duct, the tone becomes different from the original reproduction sound. Furthermore, the
vibration transmitted to the duct is further transmitted to the cabinet again, and an unnecessary
sound (harmonic component) is generated from the cabinet. Therefore, there is a need for a
speaker that does not transmit cabinet vibration to a member that forms a duct. Furthermore, by
providing the cylindrical bass reflex duct or partition plate, the vibration of the cabinet is blocked
by the members forming the duct. That is, a node of vibration is formed in the cylindrical bass
reflex duct or partition plate, and a vibration different from the vibration originally generated in
the cabinet is generated.
[0004]
Further, Patent Document 1 below proposes a speaker in which an opening is formed in the
bottom of a cabinet, a base is attached to the bottom of the cabinet, and an opening is formed in
the front of the base. However, since this speaker does not assume the speaker which vibrates a
cabinet in the first place, the device for not transmitting the vibration of a cabinet to a stand part
is not described at all.
[0005]
Japanese Utility Model Publication No. 52-167033
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2
[0006]
The present invention has been made to solve the above-mentioned conventional problems, and
an object of the present invention is to provide a speaker system which does not transmit
vibration from a cabinet to a member forming a duct.
[0007]
A speaker cabinet according to a preferred embodiment of the present invention has a first
opening defined in a bottom surface, a first cabinet for mounting a speaker unit, and an outer
peripheral portion of the bottom surface of the first cabinet and a front surface And a second
cabinet defining a second opening to form a bass reflex duct.
[0008]
The sound wave radiated from the diaphragm into the first cabinet is transmitted through the
first opening into the bass reflex duct formed by the second cabinet, phase-reversed, and
externally from the second opening. Released.
Since the first cabinet to which the speaker unit is attached and the second cabinet forming the
bass reflex duct are formed as separate members and joined to each other, vibration from the
first cabinet is attenuated at the junction. , Vibrations transmitted to the second cabinet can be
reduced.
Moreover, since the outer peripheral portion of the bottom surface of the first cabinet is joined to
both side surfaces, the back surface and the front surface of the first cabinet, the magnitude of
vibration is smaller than that of the central portion of the bottom surface There is.
Therefore, by attaching the second cabinet to the outer periphery of the bottom of the first
cabinet, the vibration transmitted to the second cabinet can be reduced more satisfactorily.
Therefore, when the first cabinet is formed of a relatively thin plate material or a plate material
for musical instruments, and the first cabinet is also vibrated according to the vibration of the
diaphragm, the vibration transmitted to the second cabinet forming the bass reflex duct Can be
reduced very well. Therefore, it is possible to prevent the vibration from being transmitted to the
second cabinet forming the bass reflex duct, and to reduce unnecessary radiation noise (for
example, radiation of harmonic components that affect the timbre). Conversely, for the same
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reason, it is possible to prevent vibration of the bass reflex duct caused by air moving in the bass
reflex duct from being transmitted to the cabinet. In particular, when the harmonic component of
the vibration of the bass reflex duct is transmitted to the cabinet, the harmonic component is
radiated from the cabinet having a large surface area, but according to the present invention, the
radiation of the harmonic component from the cabinet is extremely reduced. it can. Therefore, it
is possible to prevent the tone color of the reproduced sound from being changed from the
original tone color.
[0009]
In a preferred embodiment, the second cabinet is attached to a first side surface portion mounted
flush with one side surface of the first cabinet, and the other side surface of the first cabinet. A
second side surface mounted in the same plane, a back surface area mounted in the same plane
as the rear surface of the first cabinet, a bottom surface of the first cabinet, the first side surface
And a bottom surface portion forming the bass reflex duct with the second side surface portion
and the back surface portion.
[0010]
Since the first side, the second side and the back of the second cabinet are joined to the portion
of the bottom of the first cabinet where the magnitude of vibration is small, transmission from
the first cabinet to the second cabinet Vibration can be reduced extremely well.
In addition, since the bottom surface of the first cabinet constitutes the upper surface of the bass
reflex duct, the bonding area between the first cabinet and the second cabinet can be reduced.
Therefore, the vibration transmitted from the first cabinet to the second cabinet can be reduced
more satisfactorily.
[0011]
In a preferred embodiment, the second cabinet is flush with a first side surface portion mounted
so as to be flush with one side surface of the first cabinet, and flush with the other side surface of
the first cabinet. A second side surface mounted in the same manner, a back surface surface
mounted so as to be flush with the back surface of the first cabinet, the first side surface, the
second side surface and the back surface, and the bass reflex duct Have a bottom portion and a
top portion.
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[0012]
The top and bottom portions of the second cabinet form a bass reflex duct, and the bottom
surface of the first cabinet does not constitute a bass reflex duct.
Therefore, the vibration of the first cabinet can be prevented from being transmitted to the air in
the bass reflex duct, and unnecessary radiation noise can be reduced.
[0013]
In a preferred embodiment, the second cabinet further includes a duct extension which is
provided at the upper part of the upper surface and which extends the bass reflex duct inside the
first cabinet.
[0014]
By providing the duct extension, the length of the bass reflex duct can be set according to the
bass characteristic without being influenced by the depth of the second cabinet.
[0015]
In a preferred embodiment, a shock absorber is disposed between the first cabinet and the
second cabinet.
[0016]
Since the vibration from the first cabinet is absorbed and reduced by the shock absorbing
material, the vibration transmitted from the first cabinet to the second cabinet can be further
reduced.
Moreover, the shock absorber can prevent the second cabinet from inhibiting the vibration of the
first cabinet.
[0017]
A speaker cabinet according to another preferred embodiment of the present invention has a first
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opening defined in the bottom, a first cabinet for mounting a speaker unit, and a bottom of the
first cabinet, the first cabinet being mounted on the front A second cabinet defining an opening
of 2 and forming a bass reflex duct, and a buffer disposed between the first cabinet and the
second cabinet.
[0018]
According to another aspect of the present invention, a speaker system can be provided.
The speaker system comprises any of the above speaker cabinets and at least one speaker unit
attached to the speaker cabinet.
[0019]
The speaker cabinet of the present invention is attached to a first cabinet having a speaker unit
attached and a first opening defined on the bottom, and attached to an outer peripheral portion
of the bottom of the first cabinet and defining a second opening on the front Since the second
cabinet forming the bass reflex duct is provided, it is possible to prevent the transmission of the
vibration from the first cabinet to the second cabinet forming the bass reflex duct.
[0020]
Hereinafter, preferred embodiments of the present invention will be specifically described with
reference to the drawings, but the present invention is not limited to these embodiments.
FIG. 1 is a schematic perspective view of a speaker system 100 according to a preferred
embodiment of the present invention.
FIG. 2 is a schematic perspective view (broken line indicates the inside) of the speaker system
100 when disassembled.
FIG. 3 is a schematic cross-sectional view of the speaker system 100. As shown in FIG. The
speaker system 100 includes at least one speaker unit 1 (two speaker units in this example) and
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a cabinet 2 to which the speaker unit 1 is attached. The speaker system 100 further includes a
shock absorber 3 described later, as necessary.
[0021]
The cabinet 2 has a first cabinet 4 and a second cabinet 5. The speaker unit 1 is attached to the
front surface of the first cabinet 4, and a first opening 6 for allowing air to enter and leave the
bass reflex duct 7 is defined on the bottom surface of the first cabinet 4. The first opening 6 is
defined to communicate with the space of the bass reflex duct 7 when the first cabinet 4 and the
second cabinet 5 are joined. The shape and size of the first opening 6 may be any suitable shape
and size depending on the characteristics of the speaker system 100 as long as the first opening
6 faces the bass reflex duct 7 . In the present example, the first opening 6 is defined as a
rectangle, but may be, for example, a circle, a square or the like. The position where the first
opening 6 is defined is also defined near the back of the first cabinet 4 in this example, although
any appropriate position may be adopted depending on the characteristics of the speaker system
100.
[0022]
The upper surface of the second cabinet 5 is attached to the bottom surface of the first cabinet 4
and defines a second opening 8 on the front surface to form a bass reflex duct 7. The second
cabinet 5 has a rectangular plate material cut out so as to define the space of the bass reflex duct
7. That is, the cross section of the portion forming the bass reflex duct 7 is concave. Specifically,
the second cabinet 5 includes a first side surface 9, a second side surface 10, a back surface 11
and a bottom surface 12. The bass reflex duct 7 is formed by the first side face 9, the second side
face 10, the back face 11, the bottom face 12 and the bottom face of the first cabinet 4. The
sound wave radiated from the back side of the speaker unit 1 into the first cabinet 4 is
transmitted into the bass reflex duct 7 through the first opening 6 and is phase-reversed by the
bass reflex duct 7 so as to produce the second aperture. It radiates to the outside from 8 and the
bass is strengthened.
[0023]
By configuring the first cabinet 4 and the second cabinet 5 as separate members and joining
them, the vibration transmitted from the first cabinet 4 to the second cabinet 5 is reduced at the
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junction. . Furthermore, the second cabinet 5 is, for example, bonded to the first cabinet 4 by an
adhesive or a screw. Due to the change in impedance associated with the change in material
(from wood to adhesive, from adhesive to wood) at the joint between the first cabinet 4 and the
second cabinet 5 through the adhesive, from the first cabinet 4 The vibrations transmitted to the
second cabinet 5 are further reduced at the joints. In addition, the vibration transmitted from the
first cabinet 4 to the second cabinet 5 due to a change in impedance due to screwing at the joint
between the first cabinet 4 and the second cabinet 5 by joining by screws. It is further reduced at
the joints.
[0024]
The second cabinet 5 is attached to the outer periphery of the bottom of the first cabinet 4.
Attaching to the outer peripheral portion of the bottom surface of the first cabinet 4 means
attaching each outer surface of the first cabinet 4 and each outer peripheral surface of the
second cabinet 5 so as to be flush with each other. That is, the vertical and horizontal lengths of
the bottom of the first cabinet and the top of the second cabinet are equal to each other.
Specifically, the outer surface of the second side surface portion 10 is the first cabinet such that
the outer surface of the first side surface portion 9 is flush with the outer surface of the one side
surface 13 of the first cabinet 4 And the second cabinet 5 is flush with the outer surface of the
back surface 15 of the first cabinet 4 so as to be flush with the outer surface of the other side 14
of 4. It is attached to the first cabinet 4. The outer periphery (and its vicinity) of the bottom
surface of the first cabinet 4 is joined and fixed to the front, both sides, or the back of the first
cabinet 4, so that the magnitude of vibration is very large compared to the central part. Small.
That is, the outer peripheral portion of the bottom surface of the first cabinet 4 is a node of
vibration. Therefore, the vibration transmitted from the first cabinet 4 to the second cabinet 5
can be reduced by attaching the second cabinet 5 to the outer periphery of the bottom surface of
the first cabinet 4.
[0025]
In the present embodiment, since the bottom surface of the first cabinet 4 constitutes the upper
surface of the bass reflex duct 7, the area where the first cabinet 4 and the second cabinet 5 are
joined can be reduced. Specifically, the upper surfaces of the first side surface portion 9, the
second side surface portion 10 and the rear surface portion 11 are only joined to the bottom
surface of the first cabinet 4. Therefore, the small joint area can further reduce the vibration
transmitted from the first cabinet 4 to the second cabinet 5.
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[0026]
Preferably, the cushioning material 3 is disposed between the first cabinet 4 and the second
cabinet 5. The cushioning material 3 is provided over the entire junction of the first cabinet 4
and the second cabinet 5. The vibrations transmitted from the first cabinet 4 to the second
cabinet 5 are absorbed by the buffer and can be reduced very well. The shock absorbing material
3 may be any suitable material that reduces vibration transmission, but typically, felt, rubber,
cotton, urethane, cork or the like may be employed. The thickness of the cushioning material 3 is
preferably 0.5 to 1 mm when the material is felt. If the thickness is 1 mm or more, the thickness
is unlikely to be constant, and if it is less than 0.5 mm, the damping effect is small.
[0027]
As described above, in the speaker system of the present embodiment, the second cabinet is
attached to the outer peripheral portion of the bottom surface of the first cabinet, so that the
vibration transmitted from the first cabinet to the second cabinet can be reduced extremely well.
[0028]
Next, another preferred embodiment of the present invention will be described with reference to
FIG. 4 to FIG.
FIG. 4 is a schematic perspective view of a speaker system 400 according to the present
embodiment. FIG. 5 is a schematic perspective view (broken lines indicate the inside) of the
speaker system 400 when disassembled. FIG. 6 is a schematic cross-sectional view of the speaker
system 400. As shown in FIG. The second cabinet 5 in the present embodiment is further
provided with an upper surface portion 42 having a length from the front surface of the second
cabinet to the first opening 6 in addition to the configuration of FIGS. 1 to 3. Thus, the bass reflex
duct 7 and the second opening 8 are defined in the second cabinet 5 itself. Specifically, the bass
reflex duct 7 is formed by the top surface portion 42, the back surface portion 11, the bottom
surface portion 12, the first side surface portion 9 and the second side surface portion 10. A
third opening 41 having a shape corresponding to the first opening 6 is defined in the second
cabinet 5. The third opening 41 is formed in such a position, size, and shape as to coincide with
the first opening 6 when the first cabinet 4 and the second cabinet 5 are joined. That is, the
second cabinet 5 has a rectangular plate material cut out so as to define the bass reflex duct 7,
the second opening 8 and the third opening 41. Thus, the space of the bass reflex duct 7 is in
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communication with the space in the first cabinet 4 through the third opening 41 and the first
opening 6. The shock absorbing material 3 has a hole of a shape corresponding to the third
opening 41 defined.
[0029]
In the configuration of FIGS. 1 to 3, since the bottom surface of the first cabinet 4 constitutes the
upper surface of the bass reflex duct 7, the vibration of the first cabinet 4 is transmitted to the air
in the bass reflex duct 7. In the present embodiment, the bass reflex duct 7 is configured by
forming the second cabinet 5 in a cylindrical shape (that is, the bottom surface of the first
cabinet 4 does not constitute the top surface of the bass reflex duct 7), Unnecessary radiation
noise can be reduced without the vibration of the first cabinet 4 being transmitted to the air in
the bass reflex duct 7. This is because the vibration from the first cabinet 4 is reduced by the
joint between the buffer 3 and / or the first cabinet 4 and the second cabinet 5.
[0030]
Next, another preferred embodiment of the present invention will be described with reference to
FIGS. 7 and 8, but only differences from FIGS. 4 to 6 will be described. FIG. 7 is a schematic
perspective view when the speaker system 700 according to the present embodiment is
disassembled. FIG. 8 is a schematic cross-sectional view of the speaker system 700. As shown in
FIG. Although FIG. 7 and FIG. 8 illustrate a toll-boy type speaker system as an example, the
present invention is not limited to this. The first cabinet 4 in this example is formed such that the
area of the first opening 6 is larger than the area of the third opening 41, as compared with the
configurations of FIGS. 4 to 6. . That is, the bottom surface 4 a of the first cabinet 4 only has a
minimum area (width) sufficient to be joined to the top surface 42 of the second cabinet 5.
Usually, when attaching a sound absorbing material etc. inside the cabinet, the worker attaches
the sound absorbing material from the mounting hole of the speaker unit, but when the width
and depth are small in the tallboy type speaker system, the sound absorbing material is attached
inside the cabinet The work is very difficult. However, in this example, since the sound absorbing
material and the like can be attached to the inner wall of the first cabinet 4 from the bottom side
through the first opening 6 formed large, the attachment work of the sound absorbing material is
very easy. become.
[0031]
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The second cabinet 5 has a duct extension 71 for extending the space of the bass reflex duct 7
inside the first cabinet 4 as needed. The duct extending portion 71 is provided on the upper
surface portion 42, the first side surface portion 9, the second side surface portion 10, and the
back surface portion 11, and preferably extends perpendicularly to the upper surface portion 42.
In this case, since the length of the duct extension 71 can be provided long in the first cabinet 4,
it is possible to form a bass reflex duct having an arbitrary length according to the required bass
characteristic. The duct extension 71 may be integrally formed in the second cabinet 5 or may be
joined by an adhesive or the like after being formed as a separate member.
[0032]
The duct extending portion 71 has a cylindrical shape whose outer periphery is a rectangular
solid (the outer peripheral shape is not limited as long as it is cylindrical, and may be cylindrical
or the like), and the space 72 formed therein is the bottom side By communicating with the third
opening 41 through the opening 71A and communicating with the space in the first cabinet 4
through the opening 71B on the upper surface side, it functions as a part of the space of the bass
reflex duct 7 ing. Although the space 72 is not particularly limited, the cross-sectional shape in
the horizontal direction with respect to the upper surface portion 42 is formed to match the
shape of the third opening 41. The length of the duct extension 71 (the length in the direction
orthogonal to the upper surface 42) may be set to an arbitrary length according to the required
bass characteristic. That is, in the previous embodiment, the length of the bass reflex duct can
not be set longer than the depth of the second cabinet 5, but in the present embodiment, by
providing the duct extension 71, the required bass characteristic is obtained. Accordingly, it is
possible to form the bass reflex duct 7 having an arbitrary length or more than the depth of the
second cabinet 5.
[0033]
As described above, in the configurations of FIG. 7 and FIG. 8, the length of the bass reflex duct
can be set arbitrarily without being affected by the depth of the second cabinet 5 by having the
duct extension 7. .
[0034]
Although the preferred embodiments of the present invention have been described above, the
present invention is not limited to these embodiments.
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In the configuration of FIGS. 7 and 8, the duct extension 71 may not be provided.
[0035]
The present invention can be suitably employed for a speaker system that provides a listener
with sound waves due to the vibration of the cabinet itself, and forms a bass reflex duct to
enhance bass.
[0036]
FIG. 1 is a schematic perspective view showing a speaker system according to a preferred
embodiment of the present invention.
It is an exploded view of the speaker system of FIG. It is a schematic sectional drawing of the
speaker system of FIG. FIG. 7 is a schematic perspective view showing a speaker system
according to another preferred embodiment of the present invention. FIG. 5 is an exploded view
of the speaker system of FIG. 4; FIG. 5 is a schematic cross-sectional view of the speaker system
of FIG. 4; FIG. 7 is a schematic perspective view showing an exploded view of a speaker system
according to another preferred embodiment of the present invention. It is a schematic sectional
drawing of the speaker system of FIG.
Explanation of sign
[0037]
1 Speaker unit 2 Cabinet 3 Buffering material 4 First cabinet 5 Second cabinet 6 First opening 7
Bass reflex duct 8 Second opening
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