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DESCRIPTION JP2016019237

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DESCRIPTION JP2016019237
An acoustic converter for active noise control, which utilizes space inside a suitable structure of a
vehicle as a capacity and prevents water or foreign matter from this structure from reaching a
diaphragm of a speaker unit or the like. provide. SOLUTION: The first connection portion 41 is
located above the second connection portion 42 and the duct main body 40 is inclined, so that,
for example, the vehicle travels when it is raining and water or foreign matter in the structure ST
Even if water penetrates, water or foreign matter does not easily enter the enclosure 3 along the
duct 4 and water or foreign matter is prevented from reaching the members (the diaphragm 21,
the edge, the damper, etc.) constituting the speaker unit 2 be able to. That is, the minimum
resonance frequency is prevented from changing due to water or foreign matter adhering to the
vibrating portion of the speaker unit 2, and noise emitted by the active noise control acoustic
converter 1 should be suppressed or eliminated. It is difficult to shift from the opposite phase,
and noise can be effectively suppressed or eliminated. [Selected figure] Figure 3
Acoustic converter for active noise control
[0001]
The present invention relates to an acoustic converter for active noise control.
[0002]
Heretofore, a noise cancellation device (an acoustic conversion device for active noise control)
has been proposed which suppresses or eliminates noise around the vehicle (see, for example,
Patent Document 1).
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The conventional noise cancellation device described in Patent Document 1 is configured to
suppress or eliminate noise by radiating a sound having a phase opposite to that of the noise into
an indoor space of a vehicle by a speaker device.
[0003]
Japanese Patent Laid-Open No. 2002-351488
[0004]
However, when it is going to install the conventional noise cancellation device indicated in patent
documents 1 in vehicles, it is possible that the installation space of the enclosure which
accommodates the speaker unit which has a diaphragm etc. can not be secured in vehicles.
That is, although the enclosure containing the speaker unit needs to be configured to have a
predetermined capacity in order for the speaker device to have a desired sound pressure and
frequency characteristic, when the enclosure is installed, such a predetermined There are cases
where it is difficult to secure a space having a capacity of
[0005]
Then, in order to utilize the space inside the suitable structure of a vehicle as capacity, the
composition which connects an enclosure and this structure can be considered. In this case, the
sum of the capacity of the structure and the capacity of the enclosure becomes the capacity
available by the enclosure, and the speaker device can have desired sound pressure and
frequency characteristics even if the capacity of the enclosure itself is small, and the installation
of the enclosure It becomes easy to secure space in the vehicle. However, the structure of the
vehicle may not have sufficient airtightness, and water or foreign matter may intrude into the
structure of the vehicle. When the water or foreign matter further intrudes into the enclosure to
reach and further adhere to a member (a diaphragm, an edge, a damper, etc.) constituting the
speaker unit, the minimum resonance frequency of the speaker unit fluctuates. When the lowest
resonance frequency of the speaker unit fluctuates, the phase of the sound radiated from the
diaphragm of the speaker unit fluctuates, so the phase of the sound radiated by the diaphragm of
the speaker unit deviates from the opposite phase of the noise to be suppressed or eliminated As
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a result, the effect of suppressing or removing noise is reduced.
[0006]
An object of the present invention is to use a space inside a suitable structure of a vehicle as a
capacity and prevent water or foreign matter from this structure from reaching the diaphragm of
the speaker unit or the like. It is an example to provide an acoustic converter for active noise
control that can prevent fluctuation of the lowest resonance frequency, prevent unintended
deviation of the phase of sound radiated from the speaker unit, and effectively suppress or
eliminate noise. Can be mentioned as
[0007]
In order to solve the above-mentioned problems and achieve the object, the acoustic conversion
device for active noise control of the present invention according to claim 1 accommodates a
speaker unit for emitting a sound into an indoor space of a vehicle, and the speaker unit. An
enclosure, and a duct connecting the enclosure to a structure of the vehicle, wherein the speaker
unit is a vibration that radiates a sound from one side to the indoor space and a sound from the
other side into the enclosure A plate, an edge supporting the diaphragm, a magnetic circuit
driving the diaphragm, and a frame supporting the edge and the magnetic circuit, wherein the
duct is connected to the enclosure; And a second connection portion connected to the structure,
and the first connection portion is at the same height as the second connection portion, or It is
characterized in that located towards.
[0008]
It is a perspective view which shows a mode that the acoustic converter for active noise control
which concerns on Example 1 of embodiment of this invention was provided in the vehicle.
It is a perspective view which expands and shows A of FIG.
It is the schematic which shows the acoustic converter for said active noise control. FIG. 6 is a
schematic view showing an active noise control acoustic converter according to a second
embodiment. FIG. 13 is a schematic view showing an acoustic converter for active noise control
according to a third embodiment. FIG. 14 is a schematic view showing an acoustic converter for
active noise control according to a fourth embodiment. FIG. 14 is a schematic view showing an
acoustic converter for active noise control according to a fifth embodiment. FIG. 18 is a
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schematic view showing an acoustic converter for active noise control according to a sixth
embodiment. (A), (B) is the schematic which shows the acoustic converter for active noise control
of the other form in Example 6. FIG.
[0009]
Hereinafter, embodiments of the present invention will be described. An acoustic converter for
active noise control according to an embodiment of the present invention includes a speaker unit
for emitting sound into an indoor space of a vehicle, an enclosure for accommodating the
speaker unit, and a duct for connecting the enclosure to a structure of the vehicle. And the
speaker unit radiates a sound from one side to the indoor space and radiates a sound from the
other side to the enclosure, an edge for supporting the diaphragm, and the diaphragm And a
frame supporting the edge and the magnetic circuit, the duct includes a first connection
connected to the enclosure, and a second connection connected to the structure. , And the first
connection portion is located at the same height or above the second connection portion. More
specifically, the lower end of the first connection portion is located at the same height or above
the lower end of the second connection portion.
[0010]
Since the first connection portion connected to the enclosure is located at the same height or
above the second connection portion connected to the vehicle structure, even if water or foreign
matter enters the structure, the duct Thus, it is difficult to intrude into the enclosure, and it is
possible to prevent the diaphragm, the edge, the damper, and the like from reaching the
enclosure. Furthermore, if the lower end of the first connection portion is located at the same
height as or the upper side of the lower end of the second connection portion, water or foreign
matter in the structure is further inhibited from entering the enclosure through the duct. Can.
That is, the minimum resonance frequency is prevented from changing due to water or foreign
matter adhering to the vibrating portion of the speaker unit, the emitted sound is less likely to
deviate from the opposite phase of the noise to be suppressed or eliminated, and the noise is
effective Can be suppressed or eliminated.
[0011]
It is preferable that the first connection portion be located above the second connection portion.
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More specifically, the lower end of the first connection portion is located above the lower end of
the second connection portion. Thereby, it is possible to further suppress the intrusion of water
or foreign matter which has entered the structure into the enclosure.
[0012]
It is preferable that the duct has an upwardly convex or downwardly convex curved portion
between the first connection portion and the second connection portion. Thus, when the duct has
a convex curved portion upward, water or foreign matter that has entered the structure does not
enter the enclosure unless it gets over the curved portion, thereby further suppressing the
intrusion of water or foreign matter into the enclosure it can. Further, when the duct has a
convex curved portion downward, water or foreign matter which is going to pass through the
duct can be trapped by the curved portion, and the intrusion of water or foreign matter into the
enclosure can be further suppressed. Also, the duct is exemplified, for example, to have a
configuration extending in the horizontal direction between the first connection portion and the
second connection portion, and at this time, the duct may have a slight inclination from the
horizontal direction.
[0013]
It is preferable that the structure has a first facing surface that horizontally faces the enclosure,
and the second connection portion is provided at a position including an upper side than a center
of the first facing surface. As a result, even if water or foreign matter intrudes into the structure,
it is difficult to reach the second connection portion, and the intrusion into the enclosure can be
further suppressed.
[0014]
It is preferable that the enclosure has a second facing surface that horizontally faces the
structure, and the first connection portion is provided at a position including a lower side than
the center of the second facing surface. Thus, even if water or foreign matter that has entered the
structure travels along the duct and further enters the enclosure, the water or foreign matter can
be easily discharged from the first connection portion toward the structure.
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[0015]
It is preferable that a bottom surface of the enclosure has an inclined surface inclined with
respect to a horizontal surface, and a drain hole is formed in the vicinity of the lower end of the
inclined surface. As a result, even if water or foreign matter that has entered the structure travels
along the duct and further enters the enclosure, this water or foreign matter travels along the
slope to the vicinity of the lower end and is drained from the water drain hole. In addition, the
water draining hole may be constituted only by the hole, and is constituted by the hole and the
valve provided in the hole and opened and closed by the pressure of the water in the enclosure of
the water in the enclosure. It may be If such a valve is provided, the enclosure can be kept
substantially closed by closing the valve when water is not accumulated in the enclosure.
[0016]
The structure is preferably a cross member. As a result, the volume inside the structure can be
sufficiently secured at a position relatively close to the passenger in the indoor space of the
vehicle. In addition, the cross member may have a frequency of intrusion of water or foreign
matter lower than that of the other structure, and in this case, the intrusion of water or foreign
matter into the enclosure can be further suppressed.
[0017]
The structure is preferably a side shell. As a result, the volume inside the structure can be
sufficiently secured at a position relatively close to the passenger in the indoor space of the
vehicle.
[0018]
Examples of the present invention will be specifically described below. In Examples 2 to 6, the
same components as those described in the first embodiment and components having the same
functions as those in the first embodiment are designated by the same reference numerals as the
first embodiment, and the description thereof is omitted.
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[0019]
Embodiment 1 FIG. 1 is a perspective view showing an acoustic noise conversion device for
active noise control 1 according to Embodiment 1 of the present invention provided on a vehicle
CA, and FIGS. 2 (A) and 2 (B) are diagrams. It is a perspective view which expands and shows the
range of A of 1, and FIG. 3 is schematic which shows the acoustic converter 1 for active noise
control.
[0020]
The acoustic converter 1 for active noise control connects the speaker unit 2 provided under the
floor of the vehicle CA, the enclosure 3 accommodating the speaker unit 2, and the enclosure 3
and the structure ST (shown in FIG. 3) of the vehicle CA. The duct 4 is configured to suppress or
remove noise (for example, engine noise) in the indoor space S1 of the vehicle CA.
[0021]
The speaker unit 2 includes a diaphragm 21 as shown in FIG. 3, an edge (not shown) supporting
the diaphragm 21, a magnetic circuit (not shown) driving the diaphragm 21, an edge and a frame
(not shown) supporting the magnetic circuit. And radiates a sound from one surface side (front
side) of the diaphragm 21 to the indoor space S1 of the vehicle CA and also radiates a sound
from the other surface side (rear side) to the rear space S2 in the enclosure 3.
In addition, the speaker unit 2 is provided near the foot of the passenger and emits noise toward
the passenger through an opening (not shown) formed on the floor of the vehicle CA, thereby
effectively suppressing noise such as engine noise. Or it is supposed to be removed.
[0022]
The enclosure 3 has an upper surface and a lower surface formed in a substantially rectangular
parallelepiped substantially parallel to the floor surface of the vehicle CA, and has the second
opposing surface 31 facing the structure ST horizontally while accommodating the speaker unit
2 on the upper surface. Is configured.
Also, the enclosure 3 is supported by a support member (not shown) on an appropriate structure
of the vehicle CA, and if the duct 4 has sufficient strength, it is connected to the structure ST and
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supported by the duct 4 Good.
[0023]
The duct 4 extends in the horizontal direction between the first connection portion 41 connected
to the enclosure 3, the second connection portion 42 connected to the structure ST, and the first
connection portion 41 and the second connection portion 42. And a duct main body 40, and the
rear space S2 in the enclosure 3 and the space S3 in the structure ST are communicated with
each other.
[0024]
The first connection portion 41 is located above the second connection portion 42, and the duct
main body 40 has a downward inclination toward the second connection portion 42 from the
first connection portion 41.
More specifically, the lower end 41U of the first connection portion 41 is located above the lower
end 42U of the second connection portion 42. In addition, the first connection portion 41 is
provided at a position including the lower side than the center in the second opposing surface
31, and the lower end 41U of the first connection portion 41 and the bottom surface of the
enclosure 3 are provided at substantially the same height. .
[0025]
The structure ST may be, for example, a cross member CM constituting the vehicle CA as shown
in FIG. 2 (A), or may be a side shell SS as shown in FIG. 2 (B). , As long as at least one of such
structures ST and the enclosure 3 are connected. By using the cross member CM or the side shell
SS as the structure ST, the volume of the space S3 can be sufficiently secured.
[0026]
In the sound conversion device 1 for active noise control as described above, the speaker unit 2
uses the rear space S2 in the enclosure 3, the space S3 in the structure ST, and the space in the
duct 4 as the rear space. This volume can be sufficiently secured to ensure the sound pressure of
the radiated sound in the bass region.
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[0027]
With the above configuration, the first connection portion 41 is positioned above the second
connection portion 42 and the duct main body 40 is inclined, and the lower end 41U of the first
connection portion 41 is closer to the lower end 42U of the second connection portion 42. Also,
for example, even if the vehicle CA travels in rainy weather and water or foreign matter intrudes
into the structure ST, the water or foreign matter hardly penetrates the enclosure 3 along the
duct 4 because water is Foreign matter can be prevented from reaching the diaphragm 21, the
edge, the damper or the like.
That is, the above configuration prevents the minimum resonance frequency from fluctuating
due to water or foreign matter adhering to the members (diaphragm 21, edge, damper, etc.)
constituting the speaker unit 2, and this active noise control sound The noise emitted by the
conversion device 1 can be made less likely to deviate from the reverse phase of the noise to be
suppressed or eliminated, and the noise can be effectively suppressed or eliminated.
[0028]
Furthermore, the first connection portion 41 is provided at a position including the lower side
than the center in the second opposing surface 31, and the lower end 41U of the first connection
portion 41 and the bottom surface of the enclosure 3 are provided at substantially the same
height. Therefore, even if water or foreign matter that has entered the structure ST has entered
the enclosure 3 along the duct, this water or foreign matter can be easily discharged toward the
structure ST, and provided on the upper surface of the enclosure 3 Arrival of the speaker unit 2
can be further suppressed.
[0029]
[Second Embodiment] In the active noise control acoustic converter 1B according to the second
embodiment, as shown in FIG. 4, the first connection portion 41B and the second connection
portion 42B of the duct 4B are provided at substantially the same height. The duct body 40B
extends substantially parallel to the horizontal direction.
More specifically, the lower end 41U of the first connection portion 41 is located at substantially
the same height as the lower end 42U of the second connection portion 42.
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[0030]
Although the configuration described above makes it more difficult to suppress the entry of
water and foreign matter into the enclosure 3 than when the first connection portion is provided
above the second connection portion, compared with the configuration of the first embodiment.
Thus, the installation position of the enclosure 3 can be lowered, and the acoustic converter 1B
for active noise control can be easily installed even in a vehicle having a small installation space
in the vertical direction.
[0031]
[Third Embodiment] In the active noise control acoustic converter 1C according to the third
embodiment, as shown in FIG. 5, the duct main body 40C of the duct 4C has a curved portion
43C which is convex downward at a substantially central portion in the horizontal direction. .
In addition, the whole duct main body may be formed in convex below.
[0032]
With the above configuration, when the duct 4C has the convex curved portion 43C downward,
when water or foreign matter that has entered the structure ST tries to pass through the duct 4C
to the enclosure 3, the trap by the curved portion 43C And the intrusion of water or foreign
matter into the enclosure 3 can be further suppressed.
[0033]
The structure of the active noise control acoustic conversion device 1C according to the third
embodiment is applicable not only to the active noise control acoustic conversion device but also
to a speaker device for bass reproduction.
If the wavelength of the sound emitted from the speaker unit 2 of the low-pitched sound
reproducing speaker device is sufficiently longer than the inner diameter of the duct 4C even if
the shape of the duct 4C is convex downward, this speaker unit 2 is The rear space S2 in the
enclosure 3, the space S3 in the structure ST, and the space in the duct 4C can be used as a space
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on the rear side, and this volume is sufficiently secured to emit sound in the bass region Sound
pressure can be secured.
[0034]
[Fourth Embodiment] In the active noise control acoustic converter 1D according to the fourth
embodiment, as shown in FIG. 6, the duct main body 40D of the duct 4D has a convex curved
portion 43D at a substantially central portion in the horizontal direction. . In addition, the whole
duct main body may be formed in convex upward.
[0035]
According to the above configuration, when water or foreign matter that has entered the
structure ST passes through the duct 4D to go to the enclosure 3, the water or foreign matter has
to get over the curved portion 43D, and the water or foreign matter enclosure 3 It is possible to
further suppress intrusion into the environment.
[0036]
The structure of the active noise control acoustic conversion device 1D of the fourth embodiment
is applicable not only to the active noise control acoustic conversion device but also to a speaker
device for bass reproduction.
Even if the shape of the duct 4D is formed to be convex downward, if the wavelength of the
sound emitted from the speaker unit 2 of the speaker device for reproducing low-frequency
sound is sufficiently longer than the inner diameter of the duct 4D, the speaker unit 2 is an
enclosure 3 and the space S3 in the structure ST and the space in the duct 4D can be used as the
space on the rear side, and the volume is sufficiently secured to reduce the radiation noise in the
bass region. Sound pressure can be secured.
[0037]
[Example 5] In the active noise control acoustic converter 1E according to Example 5, as shown
in FIG. 7, the second connection portion 42E of the duct 4E is closer than the center of the first
opposing surface ST1 of the structure ST. It is provided at a position including the upper side.
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[0038]
With the above configuration, even if water or foreign matter intrudes into the structure ST, the
second connection portion 42E is not formed under the structure ST where the water or foreign
matter easily accumulates, so the process up to the second connection portion 42E It becomes
difficult for water and foreign matter to reach, and the intrusion of water and foreign matter into
the enclosure 3 can be further suppressed.
[0039]
Sixth Embodiment In the sound conversion apparatus 1F for active noise control according to the
sixth embodiment, as shown in FIG. 8, the bottom surface 32 of the enclosure 3F has the inclined
surface 33 inclined with respect to the horizontal plane. A drain hole 34 is formed at the lower
end.
In addition, the inclined surface may be formed on at least a part of the bottom surface of the
enclosure, and is not limited to one having the one side (left side) as the lower end as shown in
FIG.
For example, as shown to FIG. 9 (A), while a valley part is formed of inclined surface 33B,
drainage hole 34B may be formed in this valley part. Further, as shown in FIG. 9 (B) in which FIG.
9 (A) is viewed downward, a valve 35 may be provided in the water draining hole 34B. The valve
35 is formed of, for example, a rubber plate, and a slit 35 a is formed in a cross shape. Such a
valve 35 is opened by the pressure of the water when the water is accumulated in the enclosure
3G and is discharged, and is closed when there is no water in the enclosure 3G, the enclosure 3G
is closed. Keep almost sealed.
[0040]
With the above configuration, even if water or foreign matter that has entered the structure ST
travels along the duct 4 and further enters the enclosure 3F, this water or foreign matter travels
along the slope to the lower end and is drained from the water drainage hole 34 Thus, it is
difficult to reach the speaker unit 2. In addition, if the water draining hole 34B is provided with
the valve 35, the enclosure 3G can be kept in a substantially sealed state, and the acoustic
converter for active noise control by the water draining hole 34B being formed in the enclosure
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3G. Variations in sound pressure and frequency characteristics can be suppressed.
[0041]
In addition, this invention is not limited to the said Examples 1-6, The other modification etc.
which can achieve the objective of this invention are included, and the modification as shown
below is also included in this invention.
[0042]
For example, in the first embodiment, the first connection portion 41 is provided at a position
including the lower side in the second opposing surface 31 than the center, and the lower end
41U of the first connection portion 41 and the bottom surface of the enclosure 3 have
substantially the same height. The first connection portion may be provided at an appropriate
position on the second facing surface.
For example, the first connection portion may be provided above the second facing surface, and
according to such a configuration, even if the relative position between the structure and the
enclosure in the vertical direction is determined, the first connection portion Can be easily
provided above the second connection portion, and the intrusion of water or foreign matter from
the structure into the enclosure can be further suppressed.
[0043]
In the fifth embodiment, the second connection portion 42E of the duct 4E is provided at a
position including the upper side of the center of the first facing surface ST1 of the structure ST,
but the second connection portion is the first It may be provided at an appropriate position on
the facing surface. For example, the second connection portion may be provided below the first
facing surface. According to such a configuration, even if the relative position between the
structure and the enclosure in the vertical direction is determined, the second connection portion
Can be easily provided below the first connection portion, and the inclination of the duct body
can be increased to facilitate discharge of water and foreign matter that has entered the
enclosure toward the structure.
[0044]
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In the first to sixth embodiments, the enclosure 3 and the structure ST are horizontally opposed
to each other, and the first connection portion 41 and the second connection portion 42 are
provided on the respective opposing surfaces 31 and ST1. The enclosure and the structure may
not be horizontally opposed, and the enclosure may be provided above the structure.
Furthermore, for example, a first connection may be provided on the lower surface of the
enclosure, or a second connection may be provided on the upper surface of the structure.
[0045]
In the first to sixth embodiments, the extending direction and the shape of the duct, the positions
of the first connecting portion and the second connecting portion, and the shape of the enclosure
are exemplified. However, the first connecting portion is the second connecting portion If they
are located at the same height or above, they may be combined appropriately.
[0046]
In the first embodiment, the speaker unit 2 and the enclosure 3 are provided under the floor of
the vehicle CA. However, the speaker unit and the enclosure are provided at appropriate
positions that can emit sound toward the passenger. It may be provided, for example, on a
dashboard or door of a vehicle, and the enclosure may be connected by a duct and a suitable
structure inside the dashboard or door.
[0047]
Moreover, in the said Example 1, although the engine sound was illustrated as noise, the
structure which suppresses or removes noises, such as wind noise and the friction noise of a tire,
may be sufficient.
Furthermore, in order to suppress or eliminate these noises, noise patterns corresponding to
vehicle conditions such as vehicle type, speed, acceleration, etc. may be stored in advance, and
sound collecting means for collecting generated noises are provided. It is also possible to emit a
damping noise according to the noise.
[0048]
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Besides, the best configuration, method and the like for carrying out the present invention are
disclosed in the above description, but the present invention is not limited to this.
That is, although the present invention has been particularly illustrated and described primarily
with respect to particular embodiments, it should be understood that the present invention may
be configured relative to the above-described embodiments without departing from the spirit and
scope of the present invention. Those skilled in the art can make various modifications in
materials, quantities, and other detailed configurations. Therefore, the description with the
above-described disclosure of the shape, the material, etc. is exemplarily described for facilitating
the understanding of the present invention, and is not intended to limit the present invention.
The description in the name of a member from which some or all of the limitations such as the
limitation have been removed is included in the present invention.
[0049]
DESCRIPTION OF SYMBOLS 1 Active noise control acoustic converter 2 Speaker unit 3 Enclosure
4 Duct 21 Diaphragm 31 2nd opposing surface 32 Bottom surface 33 Inclination surface 34
Water drainage hole 35 Valve 41 1st connection part 41U Lower end 42 of 1st connection part
2nd connection Lower part 43C of the second connection part 43C, 43D Curved part CA Vehicle
ST Structure ST1 First facing surface CM Cross member SS Side shell S1 Indoor space S2 Rear
space S3 Space in structure
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