close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2012161109

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2012161109
A speaker device having a simple structure that solves various problems caused by air sucked
and discharged by a bass reflex port is realized. A bass reflex port (10) comprises a main pipe
portion (100) and air rectifiers (101, 102) installed at both ends of the main pipe portion. The
main tube portion 100 is a circular tube having a constant circular hollow cross section
consisting of an inner diameter and a length for exciting the Helmholtz resonance at a desired
frequency. The air rectifiers 101 and 102 are formed in such a shape that the hollow crosssectional area gradually increases from the side connected to the main pipe portion 100 to the
opposite side. At this time, in the air rectifiers 101 and 102, in the two pairs of wall groups
facing each other, the distance between the pair of wall surfaces is formed constant, and the
other pair of wall surfaces has a hollow cross-sectional area in accordance with an exponential
function. It is formed to increase monotonically. [Selected figure] Figure 2
Speaker device
[0001]
The present invention relates to a speaker device having a bass reflex structure.
[0002]
2. Description of the Related Art Conventionally, as a speaker device that performs bass
enhancement, there is one using a phase inversion type enclosure.
16-04-2019
1
The phase reversal type enclosure includes a speaker unit and a bass reflex port installed on a
baffle plate which is a front plate of the cabinet. The bass reflex port has an opening formed in
the front plate, and a cylindrical portion installed inside the enclosure and connected to the
opening (see, for example, Patent Document 1).
[0003]
A structure that solves various problems has been proposed for such a bass reflex port.
[0004]
For example, if the diameter of the bass reflex port is constant and an edge portion (corner
portion) exists at the end face of the opening end, a vortex is generated at the corner at the time
of intake and noise is generated.
To solve this problem, generally, as shown in FIG. 10, a structure in which the corners of the
open ends 101 'and 102' of the bass reflex port 10 'are radially rounded is used. FIG. 10 is a view
showing various structures of a general phase inversion type enclosure 1 'in a conventional small
speaker.
[0005]
Also, the bass reflex port performs bass enhancement using Helmholtz resonance due to the air
spring inside the enclosure and the mass of air in the bass reflex port. Therefore, the setting
frequency of the enhanced bass is determined by the relationship between the shape of the
cabinet 11 'forming the enclosure 1' and the shape of the bass reflex port 10 '. Therefore, the
inner diameter of the bass reflex port 10 'may be reduced due to the shape of the cabinet 11'.
[0006]
When the inner diameter of the bass reflex port 10 'is thus reduced, the flow velocity of air in the
bass reflex port 10' is increased, and the flow velocity of exhaust air from the port is also
enhanced. For this reason, in a structure in which a grille or punching metal is installed at the
opening, the exhaust from the port collides with the grille or the like to generate noise. To solve
16-04-2019
2
this problem, a method of installing a buffer or the like for suppressing the flow velocity of air in
the bass reflex port is used.
[0007]
JP, 2008-48176, A
[0008]
However, in the structure in which the corners of the open end of the bass reflex port are radially
rounded, the exhaust flow is strongly straight, so while the air gradually diffuses during exhaust,
it goes almost straight along the central axis of the bass reflex port. , Evacuated while the flow
rate is almost maintained.
Therefore, if the grille is arranged as described above, noise is generated. Furthermore, the same
applies to the opening end on the speaker unit side, and the exhaust from the opening end
collides with the speaker unit and the inner wall of the enclosure to generate noise inside the
enclosure.
[0009]
Further, when the shock absorbing material is installed in the bass reflex port, the damping
caused by the air resistance by the shock absorbing material works with respect to the abovementioned resonance operation, and the bass enhancement effect is reduced. And, the reduction
of the bass enhancement effect is noticeable when the flow velocity has to be increased by
narrowing the inner diameter of the bass reflex port in order to miniaturize the enclosure.
[0010]
Furthermore, if it is necessary to bend the bass reflex port halfway in order to take a long bass
reflex port, if the flow velocity of the bass reflex port is high, the curved portion has to be shaped
so as to bend as gently as possible. You will receive it.
[0011]
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to realize a
16-04-2019
3
speaker device having a simple structure that solves various problems caused by air sucked and
discharged by the bass reflex port.
[0012]
The present invention relates to a speaker apparatus including a phase inversion type enclosure
in which a speaker unit and a bass reflex port are installed.
[0013]
The bass reflex port of this speaker device has a constant size in which the length in one
direction of the hollow cross section does not change along the axial direction, and the area
changes continuously as the hollow cross section becomes smaller from one point to the other It
is characterized in that the rate is increased.
[0014]
In this configuration, the bass reflex port is formed such that the hollow cross-sectional area
becomes larger as it is separated in the axial direction from the inside of the port toward the one
open end.
For example, the closed region is formed by the first wall pair at a constant distance and the
second wall pair gradually separated, thereby changing the length in one direction of the hollow
cross section along the axial direction. Without this, the hollow cross-sectional area is increased.
[0015]
In this structure, at the time of intake, the intake cross-sectional area on one opening side is
larger than the hollow cross-sectional area inside the port.
For this reason, the intake flow velocity drawn into the bass reflex port becomes low, and the
turbulent flow at the open end is suppressed.
Furthermore, since the hollow cross-sectional area is shaped so as to change continuously, there
16-04-2019
4
is no corner on the wall surface, and turbulence does not occur even if the flow velocity of air is
increased toward the inside of the bass reflex port.
[0016]
On the other hand, when exhausting, diffusion of air in the opposite wall surface direction is
suppressed by the first wall surface pair, and a constant pressure continues to be applied from
the first wall surface pair to the air in the hollow portion in this direction. .
Thus, the pressure from the first wall surface direction continues to be applied, and an air flow is
generated that spreads across the entire cross section. While the state is maintained, the distance
between the second wall pair increases, and the cross-sectional area of the hollow portion
increases, whereby the exhaust flow velocity gradually decreases. As a result, at the time of
exhaust, the flow velocity of the exhaust exhausted from the tubular body is reduced.
[0017]
Further, as a specific method of determining the hollow cross-sectional area, the area setting
according to the exponential function value is performed. By this setting, the two opposing wall
surfaces constituting the second wall surface pair have a shape in which the distance always
spreads along the length direction (axial direction) of the bass reflex port. With this
configuration, the above-described turbulent flow suppressing action at the time of intake and
the exhaust flow speed reducing action at the exhaust time can be more effectively obtained.
[0018]
The speaker device may be configured to have a connection space portion for connecting the one
opening side of the tubular body and the opening surface of the enclosure.
[0019]
Further, in the tubular body, the hollow cross-sectional property changes continuously along the
axial direction from the location where the hollow cross-sectional area is the smallest toward the
other bass reflex port opening side, and the other opening side The area change rate becomes
larger as it approaches.
16-04-2019
5
[0020]
Further, a predetermined long portion along the axial direction where the hollow cross-sectional
area is the smallest becomes a main pipe portion having a constant hollow cross-sectional area,
and is connected to at least one end of the main pipe portion; A portion of the tubular body
which gradually increases from the connection side to the main pipe portion toward the open
end of the bass reflex port, and in which the length in one direction of the hollow cross section
becomes a constant dimension becomes an air rectifier.
[0021]
Further, the main pipe portion and the air rectifier are disposed such that the center of the
hollow cross section perpendicular to the axial direction of the main pipe portion coincides with
the center of the hollow cross section perpendicular to the axial direction of the air rectifier. The
wall surface of the connection portion between the main pipe portion and the air rectifier is
shaped so as to smoothly connect the wall surface of the main pipe portion and the wall surface
of the air rectifier.
[0022]
According to the present invention, the generation of noise at the time of intake can be
effectively suppressed by suppressing the turbulent flow at the time of intake at the bass reflex
port.
Furthermore, by reducing the exhaust flow velocity, noise generated when the exhaust collides
with a member outside the bass reflex port can be effectively suppressed.
As a result, it is possible to realize a speaker device in which the generation of noise is
suppressed while effectively performing bass enhancement.
Furthermore, the speaker device can suppress the generation of noise more effectively in a small
speaker device whose structure needs to increase the flow velocity of the bass reflex port.
[0023]
16-04-2019
6
It is an external appearance perspective view of the speaker apparatus 1 of 1st Embodiment.
It is the front view, the side view, and sectional drawing of the speaker apparatus 1 of 1st
Embodiment. It is explanatory drawing which shows the mode of the air flow of an inhalation |
air-intake state. It is explanatory drawing which shows the mode of the air flow of an exhaustion
state. It is a figure which shows another principle which reduces exhaust gas flow velocity. It is
an external appearance perspective view in case an air rectifier is installed only in one end of a
main pipe part. It is a figure showing another structural example of a bass reflex port. It is an
external appearance perspective view of the speaker apparatus 2 which concerns on 2nd
Embodiment. It is the front view, the side view, and sectional drawing of the speaker apparatus 2
of 2nd Embodiment. It is a figure which shows the various structures of the conventional general
phase inversion type | mold enclosure 1 '.
[0024]
A speaker device according to a first embodiment of the present invention will be described with
reference to the drawings. FIG. 1 is an external perspective view of the speaker device 1
according to the present embodiment. FIG. 2A is a front view of the speaker device 1 of the
present embodiment, and FIG. 2B is a side view of the speaker device 1 of the present
embodiment. 2 (C) is a cross-sectional view taken along the line AA 'shown in FIG. 2 (A), FIG. 2
(D) is a cross-sectional view taken along the line BB' shown in FIG. 2 (A), and FIG. It is a CC
'sectional view shown to 2 (A). As shown in FIG. 1 and FIG. 2, the speaker apparatus is provided
with signal system wiring in the phase inversion type enclosure 1, and the speaker unit SP and
the bass reflex port 10 are installed in the cabinet 11, and an opening for bass reflex port It has a
structure in which the portion 17 is formed.
[0025]
The cabinet 11 is formed of a front plate 12 and a back plate 13, a top plate 14 and a bottom
plate 15, and a pair of side plates 16A and 16B whose main surfaces are parallel to each other,
and the distance between the top plate 14 and the bottom plate 15 is other It has a rectangular
parallelepiped shape longer than the distance between the plate faces of the plate. Here, the
direction connecting the top plate 14 and the bottom plate 15 is the longitudinal direction, the
direction connecting the side plates 16A and 16B is the short direction, and the direction
connecting the front plate 12 and the back plate 13 is the depth direction. The dimensions of 11
16-04-2019
7
(enclosure 1) are determined as follows. That is, the longitudinal direction of the cabinet 11 is a
length in which the above-described speaker unit SP, the bass reflex port 10, and the connection
space 18 are sequentially arranged in the longitudinal direction and the loudspeaker unit SP and
the bass reflex port 10 have a predetermined interval. The short direction of the cabinet 11
conforms to the width of the speaker unit SP. The depth of the cabinet 11 is set according to the
depth of the speaker unit SP, and the dimension in which the rear end of the speaker unit SP
contacts the back plate 13 via a buffer material of a predetermined thickness (for example, about
0.5 mm) It is.
[0026]
The front plate 12 is provided with the speaker unit SP, and the bass reflex port opening 17 is
formed, and functions as a baffle plate. Here, the speaker unit SP is installed in the vicinity of the
top plate 14 in the longitudinal direction of the front plate 12, and the opening portion 17 for
the bass reflex port is in the vicinity of the bottom plate 15 in the longitudinal direction facing
the arrangement side of the speaker unit SP. It is formed. A bass reflex port 10 is formed on the
inner surface side of the cabinet 11 of the front plate 12. The bass reflex port 10 is connected to
the bass reflex port opening 17 via the connection space 18.
[0027]
The bass reflex port 10 includes a main pipe portion 100 having a shape extending in the
longitudinal direction, and air rectifiers 101 and 102 connected to both ends in the longitudinal
direction of the main pipe portion 100. The main pipe portion 100 and the air rectifiers 101 and
102 have a hollow tubular shape, and are formed such that central axes along the longitudinal
direction of the hollows coincide with each other.
[0028]
The main tube portion 100 has a hollow cross section perpendicular to the longitudinal direction
(axial direction) in a circular shape, and has a hollow tubular shape in which the hollow crosssectional area is constant at each position in the longitudinal direction. The length and the inner
diameter of the hollow tube portion 190 are values set based on the frequency of the bass to be
enhanced as the enclosure 1. Under the present circumstances, since the length of the main pipe
part 100 can be shortened as the inner diameter is smaller, the inner diameter cross sectional
16-04-2019
8
area of the hollow pipe part 190 is set to be smaller than the effective area of the speaker unit
SP. For example, the hollow cross-sectional area of the main pipe portion 100 is set to 0.2 to 1.0
times the effective area of the speaker unit SP.
[0029]
The air rectifier 101 is connected to the opening end of the main pipe portion 100 on the side of
the opening portion 17 for the bass reflex port, and the internal conversion portion 103 and the
main conversion portion 104 are continuously formed from the connection side to the main pipe
portion 100. There is.
[0030]
The hollow shape of the inner shape conversion portion 103 has the same cross-sectional
circular shape as the hollow tube portion 190 at the end portion on the main tube portion 100
side, and the inner diameter of the hollow tube portion 190 at the end portion on the main
conversion portion 104 side It is formed in the cross-sectional square shape which consists of
vertical and horizontal dimensions somewhat longer than it.
The wall surfaces 131 to 134 of the inner shape conversion portion 103 are formed such that
the hollow of the inner shape conversion portion 103 gradually changes from a circular cross
section to a square cross section as described above.
[0031]
The hollow shape of the main conversion portion 104 is the same cross-sectional square shape
as the inner shape conversion portion 103 at the end portion on the inner shape conversion
portion 103 side, and the inner shape at the end portion for the bus reflex port opening 17
(connection space 18). It is formed in the cross-sectional rectangular shape which consists of an
area larger than the shape conversion part 103 side.
[0032]
Among the wall surfaces 141 to 144 forming the hollow of the main conversion portion 104, the
wall surface 141 and the wall surface 142 opposite to the depth direction of the cabinet 11 are
respectively the wall surface 131 and the wall surface 132 opposite to the depth direction of the
16-04-2019
9
internal shape conversion portion 103. Connecting.
At this time, the wall surfaces 141 and the wall surfaces 142 are installed so that the facing
surfaces are parallel to each other. With this structure, the wall surface 141 and the wall surface
142 are the same regardless of the position of the facing surface, and the main conversion
portion 104 has a hollow shape that does not expand in the depth direction. The wall surface
143 and the wall surface 144 opposed to each other in the short direction of the cabinet 11 are
formed in such a shape that the distance between them gradually spreads according to the
exponential function value as proceeding from the inner diameter deformation portion 103 side
to the bass reflex port opening 17 side. It is done.
[0033]
With such a structure, the air rectifier 101 is gradually connected from the side connected to the
main pipe portion 100 to the side of the bass reflex port opening 17 without changing the
distance between the wall surfaces in the depth direction of the cabinet 11. The hollow crosssectional area becomes larger.
[0034]
The air rectifier 102 is connected to the open end on the speaker unit SP side of the main pipe
portion 100, and the internal conversion portion 105 and the main conversion portion 106 are
continuously formed from the side connected to the main pipe portion 100.
[0035]
The hollow shape of the inner shape conversion portion 105 is circular at the end portion on the
main pipe portion 100 side and the same in section as the hollow pipe portion 190 and the inner
diameter of the hollow pipe portion 190 at the end portion on the main conversion portion 106
side It is formed in the cross-sectional square shape which consists of vertical and horizontal
dimensions somewhat longer than it.
The wall surfaces 151 to 154 of the inner shape conversion portion 105 are formed such that
the hollow of the inner shape conversion portion 105 gradually changes from a circular crosssectional shape to a cross-sectional square shape as described above.
16-04-2019
10
[0036]
The hollow shape of the main conversion portion 106 is the same cross-sectional square as the
inner shape conversion portion 105 at the end portion on the inner shape conversion portion
105 side, and the area wider than the inner shape conversion portion 105 at the speaker unit SP
side end Is formed in a rectangular shape in cross section.
[0037]
Among the wall surfaces 161 to 164 forming the hollow of the main conversion portion 106, the
wall surface 161 and the wall surface 162 opposite to the depth direction of the cabinet 11 are
respectively the wall surface 151 and the wall surface 152 opposite to the depth direction of the
internal shape conversion portion 105. Connecting.
At this time, the wall surfaces 161 and the wall surfaces 162 are installed such that the facing
surfaces are parallel to each other.
With this structure, the wall surface 161 and the wall surface 162 are the same regardless of the
position of the facing surface, and the main conversion portion 106 has a hollow shape that does
not expand in the depth direction. The wall surface 163 and the wall surface 164 opposite to
each other in the short direction of the cabinet 11 are formed in a shape in which the distance
between them gradually spreads in accordance with the exponential function value as proceeding
from the inner diameter deformation portion 105 to the speaker unit SP side. .
[0038]
With such a structure, the air rectifier 102 is gradually disconnected from the side connected to
the main pipe portion 100 from the side of the speaker unit SP without changing the distance
between the wall surfaces in the depth direction of the cabinet 11. It becomes the shape where
the area becomes large.
[0039]
In the enclosure 1 having such a structure, the speaker unit SP vibrates to cause the following
operation.
[0040]
16-04-2019
11
FIGS. 3 and 4 are explanatory diagrams showing the state of air flow when air is drawn in from
the air rectifier 102 and exhausted from the air rectifier 101, in comparison with the structure of
the conventional example.
FIG. 3A shows an intake operation in the configuration of the present application, and FIG. 3B
shows an intake operation by a conventional simple cylindrical bass reflex port.
Further, FIG. 4A shows an exhaust operation in the configuration of the present invention, and
FIG. 4B shows an exhaust operation by the bass reflex port in which the corners of the opening
end of the conventional bass reflex port are rounded. In FIG. 3 and FIG. 4, the arrow of the white
head in the drawings shows the air flow, the arrow direction shows the air flow direction, and the
length of the arrow shows the flow velocity.
[0041]
The open end on the speaker unit SP side of the air rectifier 102 has a hollow cross-sectional
area much larger than that of the main pipe portion 100. Furthermore, the hollow cross-sectional
area of the opening surface on the speaker unit SP side of the air rectifier 102 is substantially the
same as the effective area of the speaker unit SP. For this reason, at the speaker unit SP side
open end of the air rectifier 102, the intake flow velocity becomes very low, and the turbulent
flow at the open end hardly occurs.
[0042]
In addition, since the hollow cross-sectional area of the air rectifier 102 smoothly decreases in
accordance with the exponential value along the traveling direction of air, no turbulent flow
occurs even while passing through the air rectifier 102.
[0043]
Furthermore, at the connection portion between air rectifier 102 and main pipe portion 100, the
hollow shape is smooth in a circular cross-sectional shape corresponding to main pipe portion
100 from the cross-sectional square shape corresponding to main conversion portion 106 of air
16-04-2019
12
rectifier 102 by inner shape conversion portion 105. Converted to
As a result, even when the flow velocity of the air reaches the main pipe portion 100 and the
flow velocity of the air increases, the turbulent flow at the time of the flow from the air rectifier
102 to the main pipe portion 100 does not occur. In this way, the air rectifier 102 can
significantly suppress turbulence during intake and can significantly suppress the generation of
noise based on this.
[0044]
The main pipe portion 100 has a constant hollow cross-sectional area smaller than the effective
area of the speaker unit SP as described above. The main pipe portion 100 flows the air
introduced from the air rectifier 102 at a predetermined flow velocity, and outputs the air to the
air rectifier 101. Under the present circumstances, since the main pipe part 100 is a fixed-shaped
circular tubular form, a turbulent flow does not generate | occur | produce in the main pipe part
101. FIG. Thereby, the main pipe portion 100 can excite Helmholtz resonance at a desired
frequency without generating turbulent flow.
[0045]
At the connection between the main pipe portion 100 and the air rectifier 101, the hollow shape
is smoothly converted by the inner shape conversion portion 103 from a circular cross-sectional
shape corresponding to the main pipe portion 100 to a cross-sectional square shape
corresponding to the main conversion portion 104. Furthermore, in the main pipe portion 101
and the inner shape conversion portion 103, the hollow cross-sectional area is the same, or the
inner shape conversion portion 103 is only slightly larger. As a result, air flowing from the main
pipe portion 101 into the inner shape conversion portion 103 flows along the wall of the inner
shape conversion portion 103. That is, the air flowing into the inner shape conversion unit 103
passes through the inside of the inner shape conversion unit 103 under the influence of the
inner wall surface of the inner shape conversion unit 103.
[0046]
In the main converter 104 of the air rectifier 101, the hollow cross-sectional area smoothly
16-04-2019
13
increases along the traveling direction of the air according to the exponential value. However,
since the distance between the wall surface 141 and the wall surface 142 is constant, in the main
conversion portion 104, pressure continues to be applied from the wall surface 141 and the wall
surface 142 to the air that is going to diffuse in the wall surface 141 and wall surface 142
direction. For this reason, the air spreads in the direction of the wall surface 143 and the wall
surface 144 in which the distance gradually separates from each other, and continues to receive
pressure from the wall surface 143 and the wall surface 144. That is, the air flowing through the
main conversion portion 104 is constantly influenced by the wall surfaces 141 to 144 and flows
while spreading over the entire hollow cross section. As described above, since the crosssectional area of the main converting portion 104 gradually increases with respect to the air
flowing while spreading over the entire hollow cross section, the flow velocity gradually
decreases. Then, when the opening end on the side of the opening portion 17 for the bass reflex
port of the main conversion portion 104 is reached, the cross-sectional area of the opening end
reaches the size corresponding to the speaker unit SP, and the flow velocity is sufficiently
reduced. That is, the flow velocity of the exhaust gas from the air rectifier 101 becomes
significantly lower than that of the main pipe portion 100.
[0047]
FIG. 5 is a diagram showing another principle of reducing the exhaust flow rate. FIG. 5 (A) shows
the case of the configuration of the present embodiment, and FIG. 5 (B) shows the case of the
conventional configuration.
[0048]
In general, when gas is exhausted from the tubular body at a predetermined flow rate, the
pressure is rapidly released, so that an eddy current is generated from the open end of the
tubular body. The vortex air flow is an air flow that arcs in a radial direction from the central axis
of the tubular body in a front view of the opening surface of the tubular body. And, this vortex
flow is an air flow which goes straight while diffusing gradually in the radial direction, unless it
receives external pressure. For this reason, when the opening of the tubular body has a shape
obtained by cutting the tubular body without gradually expanding, a swirling air flow is
generated along the central axis direction of the tubular body, and the momentum is maintained
to the far side. When a structure such as a grill or a punching metal is disposed outside the
opening, noise is generated due to the collision of the vortex flow.
16-04-2019
14
[0049]
Here, as shown in FIG. 5 (B), in the configuration in which the corner of the conventional open
end has a rounded cross section such that the cross-sectional area simultaneously increases in
the entire radiation direction from the main pipe portion having a constant diameter An air flow
is generated and travels with great momentum far into the distance. That is, since the pressure
from the wall surface of the port is simultaneously released at the time when the increase rate of
the cross-sectional area in the port wall surface becomes larger than the area change of the
natural diffusion of the vortex flow described above, the vortex flow is generated, The air
exhausted from the port travels by generating a vortex without reducing the flow velocity. On the
other hand, if it is attempted to reduce the rate of increase of the cross-sectional area, the radius
of curvature of the roundness to be attached to the corners of the inevitable opening becomes
large. It can not be applied to a small speaker device.
[0050]
However, by using the configuration of the present embodiment shown in FIG. 5A, since the
distance between the wall surface 141 and the wall surface 142 is constant when air is
exhausted from the main pipe portion 100 to the air rectifier 101, the air flow Since the pressure
from the wall surfaces 141 and 142 continues to be received, the diffusion in the direction of the
wall surfaces 141 and 142 is suppressed, and the light is diffused in the direction of the wall
surfaces 143 and 144 in which the interval gradually spreads. As a result, the air flow travels
while diffusing along the wall surfaces 143 and 144 without going straight along the central axes
of the main pipe portion 100 and the air rectifier 101. As a result, during the exhaust, the
pressure and the flow velocity gradually decrease in the air rectifier 101, and at the opening end
of the air rectifier 101 on the side of the opening 17 for the bass reflex port, the air flow itself
hardly occurs. Vortex flow is also less likely to occur. Therefore, it is better if the cross-sectional
area of the opening end is about the same as or more than the effective area of the speaker unit
SP. The exhaust flow velocity of the bass reflex port 10 can be sufficiently reduced by setting the.
Furthermore, even if the area of the open end is significantly reduced by designing the shape of
the air rectifier 101 according to the specifications of the speaker device (even if it is about 1/10
of the effective area of the speaker unit SP), noise Can be suppressed.
[0051]
The air whose flow velocity is thus reduced is exhausted from the bass reflex port opening 17 to
16-04-2019
15
the outside through the connection space 18. Therefore, from the bass reflex port opening 17,
the bass component amplified by the bass reflex port is emitted. At this time, since the exhaust
flow velocity from the bass reflex port 10 (the air rectifier 101) is low, even if the sound emission
direction is changed from the bottom surface direction to the front direction by the connection
space 18, the air exhausted from the bass reflex port 10 is It flows gently through the connection
space portion 18 and does not collide with the wall surface of the connection space portion 18 at
high speed to generate noise. For this reason, even if a grille or the like is disposed in front of the
bass reflex port opening 17, noise is not generated.
[0052]
Note that the bass reflex port operates by alternately drawing and discharging air from both
opening faces, and suction is performed from the air rectifier 101 from the bass reflex port
opening 17 via the connection space 18, and the air rectifier 102 There is also an operation that
exhaust is performed from In this case, the air rectifier 101 performs the intake operation of the
air rectifier 102 described above, and the air rectifier 102 performs the exhaust operation of the
air rectifier 101 described above.
[0053]
Here, since the air rectifier 101 and the air rectifier 102 have the same structure, the occurrence
of turbulent flow at the time of intake is suppressed as described above, and the exhaust flow
velocity as described above, even when the intake is performed from the opening 17 for the bass
reflex port. Can be reduced. And, in this case, although the exhausted air travels in the direction
of the speaker unit SP, since the exhaust flow velocity is low, noise that may be generated due to
vibration of the diaphragm of the speaker unit SP due to the exhaust is suppressed it can.
[0054]
The bass reflex port 10 is not limited to the structure in which the air rectifier 101 and the air
rectifier 102 are provided at both ends of the main pipe portion 100 as described above. For
example, as shown in FIG. 6, the air rectifier 101 may be installed at only one end of the main
pipe portion 100. In this case, too, the above-described intake action and exhaust action can be
obtained on the installation side of the air rectifier.
16-04-2019
16
[0055]
As described above, by using the configuration of the present embodiment, it is possible to
realize a speaker device that suppresses the generation of noise due to the bass reflex port with a
simple structure. Furthermore, by using the configuration of the present embodiment, even if
there is an obstacle such as a wall surface or a grill near the exhaust port of the bass reflex port,
no noise is generated due to the collision of these with the exhaust. The other elements that
make up the enclosure can be placed in the vicinity of. Thereby, the shape of the enclosure or
cabinet can be miniaturized. As a result, it is possible to realize a low-noise, low-tone enhanced
small speaker unit with a simple configuration.
[0056]
In the above description, the hollow sectional shape of the main pipe portion is circular, but as
shown in the main pipe portions 100A and 100B of FIGS. 7A and 7B, it may be a square or
rectangular polygonal shape, It may have an oval or oval shape. At this time, in the polygonal
shape, it is more effective to make each corner portion R-chamfered. Furthermore, although the
hollow cross sections of the air rectifiers 101 and 102 are rectangular, as shown in the air
rectifiers 101C and 101D of FIGS. 7C and 7D, the distance between the pair of opposing wall
surfaces may be the same. The corner of the rectangle may be R-chamfered, oval, or oval. FIGS.
7A to 7D are diagrams showing other structural examples of the bass reflex port.
[0057]
In the above description, the air rectifiers are installed at both ends of the main pipe portion of
the bass reflex port. However, the air rectifier may be installed at only one of them.
[0058]
Moreover, in the above description, although the example in which the distance between the pair
of wall surfaces on the side where the wall surface distance of the air rectifier changes changes
in accordance with the exponential function is shown, it is a shape having no corner portion on
the inner wall surface, Other structures may be used in which the wall spacing monotonously
increases (decreases) along the longitudinal direction.
[0059]
16-04-2019
17
In the above description, an example is shown in which the central axis of the hollow portion of
the main pipe and the central axis of the hollow portion of the air rectifier coincide along the
longitudinal direction of the bass reflex port. The structure may be
[0060]
Further, although the example in which the bass reflex port is installed on the front plate side has
been described in the above description, the bass reflex port may be installed on another plate
surface or in the center as long as it is inside the enclosure.
[0061]
Next, a speaker device according to a second embodiment will be described with reference to the
drawings.
[0062]
FIG. 8 is an external perspective view of the speaker device according to the second embodiment.
9 (A) is a front view of the speaker device 2 of the present embodiment, FIG. 9 (B) is a side view
of the speaker device 2 of the present embodiment, and FIG. 9 (C) is FIG. It is DD 'surface
sectional drawing shown to.
The speaker device 2 of this embodiment has a structure in which the main pipe portion 100 is
omitted from the bass reflex port of the speaker device shown in the first embodiment.
[0063]
As shown in FIGS. 8 and 9, in the speaker device of this embodiment, the speaker unit SP and the
bass reflex port 20 are installed in the cabinet 11 as in the loudspeaker device 1 shown in the
first embodiment, and for the bass reflex port It has a structure in which the opening 27 is
formed.
[0064]
The arrangement of the speaker unit SP and the bass reflex port opening 27 in the cabinet 11 is
16-04-2019
18
the same as the layout of the loudspeaker unit SP and the bass reflex port opening 17 shown in
the first embodiment.
[0065]
The bass reflex port 20 includes air rectifiers 201 and 202 formed of tubular bodies extending in
the longitudinal direction of the cabinet 11, and the air rectifiers 201 and 202 are connected so
as to be continuous along the longitudinal direction, and the tubular bodies It is formed so that
the central axis along the longitudinal direction of may correspond.
These air rectifiers 201 and 202 constitute a bass reflex port having a tubular body having a
shape in which the hollow cross-sectional area is gradually increased along the axial direction
toward the port opening end from the point where the hollow cross-sectional area is smallest.
[0066]
The air rectifier 201 is disposed on the side of the opening portion 27 for the bass reflex port
with respect to the air rectifier 202, and the bass enhancement function unit 203 and the main
conversion unit 204 are continuously formed from the side connected to the air rectifier 202. .
[0067]
The hollow shape of the bass enhancement function portion 203 is formed in a rectangular cross
section.
The wall surfaces 231 to 234 of the bass enhancing function portion 203 are formed such that
the hollow cross-sectional area gradually increases from the side connected to the air rectifier
202 toward the bass reflex port opening 207 side.
At this time, the bass enhancement function section 203 is formed such that the distance
between the wall surfaces 231 and 232 of the bass enhancement function section 203 becomes
constant along the longitudinal direction.
16-04-2019
19
[0068]
The hollow shape of the main conversion part 204 is the same rectangular cross section as the
bass enhancement function part 203, and is hollow from the bass enhancement function part
203 side toward the end of the bass reflex port opening 27 (connection space 28). The crosssectional area is shaped so as to gradually increase.
At this time, the distance between the wall surfaces 241 and 242 of the main conversion unit
204 is set to be the same as the distance between the wall surfaces 231 and 232 of the bass
enhancing function unit 203 and to be a fixed distance.
In addition, the wall surface 243 of the main conversion unit 204 is formed so as to be smoothly
continuous with the wall surface 233 of the bass enhancement function unit 203.
In addition, the wall surface 244 of the main conversion unit 204 is formed so as to be smoothly
continuous with the wall surface 234 of the bass enhancement function unit 203.
[0069]
On the other hand, the air rectifier 202 is disposed on the speaker unit SP side with respect to
the air rectifier 201, and the bass enhancement function unit 205 and the main conversion unit
206 are continuously formed from the side connected to the air rectifier 201.
[0070]
The hollow shape of the bass enhancing function portion 205 is formed in a rectangular cross
section.
The wall surfaces 251 to 254 of the bass enhancement function portion 205 are formed so that
the hollow cross-sectional area gradually increases from the connection side to the air rectifier
201 toward the speaker unit SP. At this time, the bass enhancement function portion 205 is
formed such that the distance between the wall surfaces 251 and 252 of the bass enhancement
function portion 205 becomes constant along the longitudinal direction.
16-04-2019
20
[0071]
The hollow shape of the main conversion portion 206 is the same cross-sectional square as the
bass enhancement function portion 205, and is shaped so that the hollow cross-sectional area
gradually increases from the bass enhancement function portion 205 side toward the end of the
speaker unit SP side. It is done. At this time, the distance between the wall surfaces 261 and 262
of the main conversion unit 206 is set to be the same as the distance between the wall surfaces
251 and 252 of the bass enhancing function unit 205 and to be a fixed distance. In addition, the
wall surface 263 of the main conversion unit 206 is formed so as to be smoothly continuous with
the wall surface 253 of the bass enhancement function unit 205. In addition, the wall surface
264 of the main conversion unit 206 is formed so as to be smoothly continuous with the wall
surface 254 of the bass enhancement function unit 205.
[0072]
Even with such a configuration, the hollow cross-sectional area and the length of the bass
enhancement functions 203 and 205 may be appropriately set according to the specifications of
bass enhancement of the speaker device 2, thereby providing no main pipe. The same action as
the action shown in the first embodiment described above can be generated, and the same effect
can be obtained.
[0073]
Although the air rectifiers 201 and 202 have the same shape in the above embodiment, they do
not necessarily have the same shape.
For example, the axial length of one air rectifier 201 may be long, and the axial length of the
other air rectifier 202 may be short. In addition, since the air rectifier 201 functions as a port if
the axial length of the air rectifier 201 is sufficiently long, the tubular body (bus reflex port) of
the present invention is realized even with only the air rectifier 201 on the port opening side. It
is possible.
[0074]
1,2-enclosure (speaker device), 10, 20-bass reflex port, 100-main pipe, 101, 102, 201, 202-air
rectifier, 11-cabinet, 12-front plate, 13-back plate, 14-sky Face plate, 15-bottom plate, 16A, 16B-
16-04-2019
21
side plate, opening for 17-bass reflex port, 18-space for connection, SP-speaker unit
16-04-2019
22
Документ
Категория
Без категории
Просмотров
0
Размер файла
35 Кб
Теги
jp2012161109, description
1/--страниц
Пожаловаться на содержимое документа