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JP2006101320

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DESCRIPTION JP2006101320
PROBLEM TO BE SOLVED: To provide a speaker having a structure in which each of a large
diameter voice coil and the small diameter voice coil can be properly disposed in a magnetic gap,
and a method of manufacturing the speaker. SOLUTION: A diaphragm 10 having a ring-shaped
main vibrating portion 11 and a ring-shaped inner support portion 12 and an outer support
portion 14 for supporting the main vibrating portion 11, and mounted on the outer edge of the
main vibrating portion 11. A speaker comprising a large diameter voice coil unit 55, a small
diameter voice coil unit 50 mounted on the inner edge of the main vibrating portion 11, and a
yoke 20 united with the diaphragm 10, and fixed to the diaphragm 10 A radial direction of the
diaphragm 10 with respect to the yoke 20 of the diaphragm 10 so as to be locked to a
predetermined portion of the yoke 20 and to arrange each of the large diameter voice coil unit
55 and the small diameter voice coil unit 50 in the magnetic gaps G1 and G2 in the magnetic
circuit. And positioning members 61, 62 for restricting the position of and the position in the
front-rear direction perpendicular to the radial direction. [Selected figure] Figure 6
Speaker and method of manufacturing the same
[0001]
The present invention relates to a speaker used in an acoustic device, and more particularly to a
speaker provided with two concentrically arranged voice coils of different diameters and a
method of manufacturing the same.
[0002]
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Conventionally, a so-called double voice coil speaker provided with two voice coils has been
proposed (see, for example, Patent Document 1).
In this type of speaker, a small diameter voice coil and a large diameter voice coil are
concentrically mounted on a diaphragm formed of paper, cloth or the like. The diaphragm and
the magnetic circuit are combined such that the small diameter voice coil and the large diameter
voice coil are disposed in a magnetic gap in a magnetic circuit formed by the yoke and a magnet
fixed to the yoke. It is done. In the speaker having such a structure, the diaphragm is vibrated by
both the small-diameter voice coil and the large-diameter voice coil to which an audio signal is
supplied, and a sound corresponding to the audio signal is generated. According to such a
speaker, it is possible to produce sounds in a wide frequency band by the small diameter voice
coil respectively receiving the sound in the relatively high frequency band and the large diameter
voice coil respectively the sound in the relatively low frequency band. It becomes. Japanese
Utility Model Publication No. 53-163120
[0003]
By the way, in the speaker having the structure as described above, the magnetic gap in the
magnetic circuit formed by the yoke and the magnet fixed to the yoke is generally narrow, and
the large diameter voice coil and the small diameter voice coil are contained in the magnetic gap.
The diaphragm and the yoke must be combined so that each of the two is properly disposed.
However, the diaphragm made of paper, cloth or the like is easily deformed in the radial direction
or in the front-rear direction of the speaker which is perpendicular to the radial direction.
Therefore, it is difficult to combine the diaphragm and the yoke so that each of the large
diameter voice coil and the small diameter voice coil is properly disposed in the magnetic gap.
[0004]
The present invention has been made in view of such circumstances, and provides a speaker
having a structure in which each of a large diameter voice coil and a small diameter voice coil
can be properly disposed in a magnetic gap, and a method of manufacturing the speaker It is a
thing.
[0005]
The speaker according to the present invention comprises a ring-shaped main vibrating portion,
a ring-shaped inner support portion supporting the radial inner side of the main vibrating
portion, and a ring-shaped outer support supporting the radial outer side of the main vibrating
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portion. A diaphragm having a portion, a large diameter voice coil unit mounted on an outer edge
of the main vibrating portion in the diaphragm, a small diameter voice coil unit mounted on an
inner edge of the main vibrating portion in the diaphragm, and a magnet And a first magnetic
gap in which the large diameter voice coil unit is disposed, and a magnetic circuit in which a
second magnetic gap in which the small diameter voice coil unit is disposed is formed. Speaker
fixed to the diaphragm and locked to a predetermined portion of the magnetic circuit, wherein
the large diameter voice coil unit and the small diameter voice coil unit are each A positioning
member for restricting the position of the diaphragm with respect to the magnetic circuit in the
radial direction and the position in the front-rear direction perpendicular to the radial direction
so as to be disposed in the first magnetic gap and the second magnetic gap It becomes.
[0006]
With such a configuration, the positioning member fixed to the diaphragm and locked to a
predetermined portion of the magnetic circuit is the radial position of the diaphragm with
respect to the magnetic circuit and the longitudinal position perpendicular to the radial direction.
The large diameter voice coil unit and the small diameter voice coil unit attached to the
diaphragm are properly disposed in the first and second magnetic gaps in the magnetic circuit.
[0007]
Further, in the speaker according to the present invention, the positioning member is bonded to
the back surface of a flat portion formed inside the ring-shaped inner support portion of the
diaphragm, and the radial direction of the central portion of the diaphragm and The diameter of
the outer peripheral portion of the diaphragm, which is bonded to the first positioning member
for restricting the position in the front-rear direction, and the back surface of the outermost
peripheral portion continuing further outward from the ring-shaped outer support portion of the
diaphragm It becomes a structure which has a 2nd positioning member which controls the
direction position and the position of the said front-back direction.
[0008]
With such a configuration, the first positioning member and the second positioning member
regulate the positions in the radial direction and the front-rear direction for both the central
portion and the outer peripheral portion of the diaphragm, and are mounted on the diaphragm
The large diameter voice coil unit and the small diameter voice coil unit are reliably disposed in
the first and second magnetic gaps in the magnetic circuit.
[0009]
In the above configuration, it is preferable that the stiffness of the main vibrating portion of the
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diaphragm is lower than the stiffness of the inner support portion and the outer support portion.
[0010]
With such a configuration, the inner support portion when the first and second positioning
members are locked to the magnetic circuit even if the inner diameter (inner edge) position and
outer diameter (outer edge) position of the ring-shaped main vibration portion vary. Since the
positions of the outer support portions are accurately defined, the inner diameter position and
the outer diameter position of the main vibrating portion having lower stiffness than the inner
support portions and the outer support portions can be correctly corrected.
Therefore, the positions of the large diameter voice coil unit and the small diameter voice coil
unit mounted on the outer edge and the inner edge of the main vibration portion are also
corrected, and are surely disposed in the first magnetic gap and the second magnetic gap,
respectively. become.
[0011]
A method of manufacturing a speaker according to the present invention includes a ring-shaped
main vibrating portion, a ring-shaped inner support portion supporting the radial inner side of
the main vibrating portion, and a ring shape supporting the radial outer side of the main
vibrating portion. And a positioning member for restricting the position of the diaphragm in the
radial direction and the position in the front-rear direction perpendicular to the radial direction
with respect to the magnetic circuit having the yoke to which the magnet is fixed. A first step of
fixing, and a second step of mounting a large diameter voice coil unit on the outer edge of the
main vibrating portion in the diaphragm and mounting a small diameter voice coil unit on the
inner edge of the main vibrating portion in the diaphragm And the small diameter voice coil unit
and the large diameter voice coil unit are engaged with each other by locking the positioning
member fixed to the diaphragm to a predetermined portion of the magnetic circuit. And a third
step of combining the diaphragm with the magnetic circuit so as to be disposed in the magnetic
gap in the magnetic circuit.
[0012]
With such a configuration, after the positioning member for restricting the radial position of the
diaphragm with respect to the magnetic circuit and the position in the front-rear direction
perpendicular to the radial direction is fixed in advance to the diaphragm, the positioning
member is Since the diaphragm is combined with the magnetic circuit so that each of the small
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diameter voice coil unit and the large diameter voice coil unit is disposed in the magnetic gap in
the magnetic circuit by locking to a predetermined portion. The diaphragm can be easily
incorporated into the magnetic circuit so that each of the small diameter voice coil unit and the
large diameter voice coil unit is surely disposed in the magnetic gap.
[0013]
In the speaker manufacturing method according to the present invention, the first step may be a
ring-shaped first positioning member for restricting the position in the radial direction and the
front-rear direction of the central portion of the diaphragm. Bonding the diaphragm to the back
surface of the flat portion formed on the inner side of the inner support portion, and the second
positioning member for restricting the radial position and the longitudinal position of the outer
peripheral portion of the diaphragm. Bonding to the back surface of the outermost peripheral
edge continuing further outward from the ring-shaped outer support portion in the third aspect,
the third step engaging the first positioning member to the central portion of the magnetic
circuit. The small-diameter voice coil unit and the large-diameter voice coil unit are disposed in
the magnetic gap by stopping the second positioning member and locking the second positioning
member to the outer peripheral portion of the magnetic circuit. It may be configured to combine
the magnetic circuit and the vibrating plate so that.
[0014]
With such a configuration, the first positioning member and the second positioning member
regulate the positions in the radial direction and the front-rear direction for both the central
portion and the outer peripheral portion of the diaphragm, so that the first positioning member
and the second positioning member are attached to the diaphragm Each of the small diameter
voice coil unit and the large diameter voice coil unit is reliably disposed in the magnetic gap in
the magnetic circuit.
[0015]
According to the speaker of the present invention, the positioning member fixed to the
diaphragm and locked to the predetermined portion of the magnetic circuit is the radial position
of the diaphragm with respect to the magnetic circuit and the front and back perpendicular to
the radial direction The diaphragm so that the large diameter voice coil unit and the small
diameter voice coil unit mounted on the diaphragm are respectively disposed in the first and
second magnetic gaps in the magnetic circuit by restricting the position of the direction Since the
magnetic circuit and the magnetic circuit are united, each of the large diameter voice coil unit
and the small diameter voice coil unit can be properly disposed in the first and second magnetic
gaps.
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[0016]
Further, according to the method of manufacturing a speaker according to the present invention,
the diaphragm is easily combined with the magnetic circuit such that each of the small diameter
voice coil unit and the large diameter voice coil unit is disposed in the magnetic gap. As a result,
it is possible to easily manufacture a speaker having a structure in which each of the large
diameter voice coil unit and the small diameter voice coil unit can be properly disposed in the
magnetic gap.
[0017]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0018]
The speaker according to the embodiment of the present invention has a structure in which the
diaphragm 10 and the yoke 20 are united as shown in FIG.
The speaker of such structure is manufactured in accordance with the procedure shown in FIGS.
FIG. 1 is a plan view of the diaphragm 10. In FIG. 2 to FIG. 6, a cross section of the diaphragm 10
taken along the line AA in FIG. 1 is shown.
[0019]
First, as shown in FIGS. 1 and 2 to 6, the diaphragm 10 made of synthetic resin, paper, cloth or
the like supports the ring-shaped main vibrating portion 11 and the radially inner side of the
main vibrating portion 11 And a ring-shaped outer support portion 14 for supporting the radially
outer side of the main vibrating portion 11, and the flat portion 13 is formed on the inner side of
the ring-shaped inner support portion 12. ing.
Each cross section (for example, refer FIG. 2) of the main vibration part 11, the inner side
support part 12, and the outer side support part 14 becomes a curved shape which protrudes on
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the front side of the said speaker.
The radius of curvature of each of the main vibration portion 11, the inner support portion 12
and the outer support portion 14 is set so as to obtain a desired sound output characteristic.
[0020]
Here, the main vibrating portion 11 has an extremely large curved diameter as compared with
the inner support portion 12 and the outer support portion 14, and therefore has lower stiffness
(hardness) than the inner support portion 12 and the outer support portion 14. There is.
[0021]
Next, a method of manufacturing the speaker will be described.
[0022]
The first step is shown in FIG.
In this first step, the inner spacer 61 (first positioning member) formed of a synthetic resin or the
like is bonded and fixed to the back surface of the flat portion 13 located at the center of the
diaphragm 10.
A convex portion 61 a is formed on the surface of the inner spacer 61 opposite to the bonding
surface to the diaphragm 10 (flat portion 13).
Further, a ring-shaped outer spacer 62 (second positioning member) formed of a synthetic resin
or the like is bonded and fixed to the back surface of the outermost peripheral edge portion
continuing further outside of the outer support portion 14 in the diaphragm 10.
[0023]
The second step is shown in FIG.
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In the second step, the small diameter voice coil unit 50 and the large diameter voice coil unit 55
are attached to the diaphragm 10 to which the inner spacer 61 and the outer spacer 62 are
adhered and fixed in the first step.
[0024]
The jig 70 has a disk-shaped substrate portion 71 and a columnar support 72 projecting from
the center of the substrate portion 71.
The outer diameter of the support 72 is approximately equal to the diameter of the inner edge of
the main vibrating portion 11 in the diaphragm 10.
The upper surface of the support 72 is formed with a recess 72 a in which the above-mentioned
inner spacer 61 is fitted.
The jig 75 has a ring shape, and a ring-shaped groove 78 is formed.
The inner diameter of the ring-shaped groove 78 is substantially equal to the diameter of the
outer edge of the main vibrating portion 11 in the diaphragm 10.
A ring-shaped projection 77 is formed on the upper end surface of the jig 75 along the outer
edge of the groove 78, and a support surface 76 is formed on the outside of the ring-shaped
projection 77.
[0025]
The small diameter voice coil unit 50 has a structure in which the small diameter voice coil 51 is
wound at a predetermined position of the small diameter bobbin 52 having an inner diameter
substantially equal to the diameter of the inner edge of the main vibrating portion 11 in the
diaphragm 10 The unit 55 has a structure in which the large diameter voice coil 56 is wound at a
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predetermined position of the large diameter bobbin 57 having an outer diameter substantially
equal to the diameter of the outer edge of the main vibrating portion 11.
Then, the small diameter bobbin 52 of the small diameter voice coil unit 50 is fitted on the outer
peripheral surface of the support 72 of the jig 70, and the large diameter bobbin 57 of the large
diameter voice coil unit 55 is radially inside the groove 78 of the jig 75. Fits along the
circumferential surface.
[0026]
In this state, the inner spacer 61 adhesively fixed to the diaphragm 10 is set so as to be fitted
into the recess 72 a formed on the upper surface of the support 72 of the jig 70, and the outer
side adhesively fixed to the diaphragm 10 A spacer 62 is set on the support surface 76 such that
the inner edge thereof abuts on the ring-shaped projection 77 of the jig 75. As a result, as shown
in FIG. 4, one end of the small diameter bobbin 52 of the small diameter voice coil unit 50 abuts
on the back side inner edge of the main vibrating portion 11 of the diaphragm 10, and is
adhesively fixed. Further, one end portion of the large diameter bobbin 57 of the large diameter
voice coil unit 55 abuts on the back side outer edge of the main vibrating portion 11 and is fixed
by adhesion.
[0027]
The third step is shown in FIG. In the third step, as described above, the diaphragm 10 and the
yoke 20 to which the inner spacer 61, the outer spacer 62, the small diameter voice coil unit 50,
and the large diameter voice coil unit 55 are bonded and fixed are united.
[0028]
The yoke 20 made of a magnetic material has a disc-like bottom 21, a ring-shaped outer
peripheral wall 22 standing on the outer edge of the bottom 21, and a central cylindrical portion
23 standing on the center of the bottom 21. The ring-shaped groove 24 is formed between the
central cylindrical portion 23 and the outer peripheral wall portion 22. A recess 23 a is formed
on the end face of the central cylindrical portion 23. A ring-shaped magnet 31 is provided so as
to be fixed to the bottom 21 in the groove 24 of the yoke 20, and a ring-shaped plate 32 made of
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a magnetic material is fixed to the end face of the magnet 31. There is. Then, a first magnetic gap
G1 is formed between the inner peripheral surface of the outer peripheral wall 22 opposed to
each other and the outer peripheral surface of the plate 32, and the outer peripheral surface of
the central cylindrical portion 23 opposed to each other and the inside of the plate 32. A second
magnetic gap G2 is formed between it and the circumferential surface. The yoke 20, the magnet
31 and the plate 32 constitute a magnetic circuit having the first and second magnetic gaps G1
and G2. A ring-shaped diaphragm support 40 is attached to the front outer edge portion of the
outer peripheral wall portion 22 in the yoke 20 and integrated with the magnetic circuit. A ringshaped protrusion 41 is formed radially inward of the support end surface 40 a of the diaphragm
support 40. The outer diameter of the ring-shaped projection 41 is set to be substantially equal
to the inner diameter of the outer spacer 62.
[0029]
The protrusion 61a of the inner spacer 61 adhesively fixed to the diaphragm 10 is engaged with
and engaged with the recess 23a formed on the end face of the central cylindrical portion 23 of
the yoke 20, and the outer spacer 62 adhesively fixed to the diaphragm 10. The inner spacer 61
is adhesively fixed to the central cylindrical portion 23 of the yoke 20 and the outer spacer 62 is
adhesively fixed to the support end surface 40 a of the diaphragm support 40 in a state where
the inner edge thereof is abutted against the projection 41. By fitting (fitting) the protrusion 61 a
of the inner spacer 61 with the recess 23 a of the central cylindrical portion 23 and bringing the
inner edge of the outer spacer 62 into contact (fitting) with the protrusion 41 of the vibration
support 40 The position in the radial direction (upper, lower, left, and right directions in FIG. 1) is
restricted. Further, by setting the thickness of the inner spacer 61 and the total thickness of the
outer spacer 62 and the diaphragm support 40, the front-rear direction perpendicular to the
radial direction of the diaphragm 10 with respect to the yoke 20 (vertical direction in FIG.
Regulation of the position of) is made.
[0030]
Although some variation may occur in the inner diameter (inner edge) position and the outer
diameter (outer edge) position of the main vibrating portion 11 having a large curved diameter,
the inner spacer 61 is fitted and locked to the yoke 20, When the spacer 62 is fitted and locked
to the diaphragm support 40, the radial positions of the inner support 12 supported by the inner
spacer 61 and the outer support 14 supported by the outer spacer 62 are accurately determined.
Since the stiffness of the main vibrating portion 11 is lower than the stiffness of the inner
supporting portion 12 and the outer supporting portion 14, the inner diameter position and the
outer diameter position of the main vibrating portion are correctly corrected.
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[0031]
As shown in FIG. 6, the small diameter voice coil 51 of the small diameter voice coil unit 50 has
the outer peripheral surface of the central cylindrical portion 23 of the yoke 20 and the inner
peripheral surface of the plate 32 as shown in FIG. Of the large diameter voice coil 56 of the
large diameter voice coil unit 55 and the outer peripheral surface of the outer wall portion 22 of
the yoke 20 and the outer peripheral surface of the plate 32. The diaphragm 10 and the yoke 20
(magnetic circuit) are united in a state of being properly disposed in the first magnetic gap G1
between them.
[0032]
In the speaker manufacturing method as described above, the inner spacer 61 and the outer
spacer 62 for regulating the radial position of the diaphragm 10 with respect to the yoke 20
(magnetic circuit) and the longitudinal position perpendicular to the radial direction After
bonding and fixing to 10, the inner spacer 61 is locked to the central cylindrical portion 23 of
the yoke 20 and the outer spacer 62 is locked to the diaphragm support 40 mounted on the
outer wall 22 of the yoke 20. The diaphragm 10 is mounted on the yoke 20 (magnetic circuit) so
that the large diameter voice coil unit 55 and the small diameter voice coil unit 50 are
respectively disposed in the first magnetic gap G1 and the second magnetic gap G2 in the
magnetic circuit. It is made to unite.
Therefore, the diaphragm 10 can be easily made to the yoke 20 (magnetic circuit) so that the
large diameter voice coil unit 55 and the small diameter voice coil unit 50 are disposed in the
first and second magnetic gaps G1 and G2, respectively. It can be united.
[0033]
Furthermore, since the inner spacer 61 and the outer spacer 62 regulate the positions in the
radial direction and the front-rear direction for both the central portion and the outer peripheral
portion of the diaphragm 10, the large diameter voice coil unit 55 attached to the diaphragm 10
and Each of the small diameter voice coil units 50 is reliably disposed in the first and second
magnetic gaps G1, G2 in the magnetic circuit.
[0034]
In the speaker manufactured by the manufacturing method described above, the positions of the
inner spacer 61 and the outer spacer 62 in the radial direction with respect to the yoke 20
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(magnetic circuit) of the diaphragm 10 and the positions in the front-rear direction perpendicular
to the radial direction In order to restrict, each of the large diameter voice coil unit 55 and the
small diameter voice coil unit 50 mounted on the diaphragm 10 is properly disposed within the
first and second magnetic gaps G1 and G2 in the magnetic circuit. The diaphragm 10 and the
yoke 20 (magnetic circuit) are combined.
[0035]
In the above embodiment, the outer spacer 62 is engaged with the yoke 20 (magnetic circuit) via
the diaphragm support 40. However, the outer spacer may be attached to the front end face of
the outer wall 22 of the yoke 20. It is also possible to form a step portion capable of positioning
62 and to directly fix the outer spacer 62 to this step portion.
[0036]
In the speaker having the structure as described above, when an audio signal is applied to the
small diameter voice coil 51 and the large diameter voice coil 56, the magnet formed by the
small diameter voice coil 51, the large diameter voice coil 56, the yoke 20, the magnet 31 and
the plate 32 The magnetic action with the circuit causes the large diameter voice coil unit 50 and
the small diameter voice coil unit 55 to vibrate in the front-rear direction (axial direction of each
voice coil unit) according to the signal waveform of the audio signal.
When this vibration is applied to the main vibrating portion 11 of the diaphragm 10, the main
vibrating portion 11 vibrates together with the inner supporting portion 12 and the outer
supporting portion 14 integrated therewith.
By the vibration of the diaphragm 10 (the main vibrating portion 11, the inner vibrating portion
12 and the outer vibrating portion 14), a sound such as music according to the audio signal is
output from the speaker.
Then, vibration in a relatively high frequency band that can be generated by the small diameter
voice coil unit 50 and vibration in a relatively low frequency band that can be generated by the
large diameter voice coil unit 55 are desired in a relatively wide frequency band. It becomes an
acoustic characteristic from which sound pressure can be obtained.
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[0037]
As described above, the speaker according to the present invention has an effect that the large
diameter voice coil and the small diameter voice coil can be properly disposed in the magnetic
gap, and the manufacture according to the present invention The method has the advantage that
such a loudspeaker can be easily manufactured, the loudspeaker according to the invention and
the method for its production comprising a loudspeaker with two concentrically arranged voice
coils of different diameter and It is useful as the manufacturing method.
[0038]
It is a top view which shows the structure of a diaphragm.
It is a figure which shows the 1st process in the manufacturing method of the speaker which
concerns on embodiment of this invention.
It is a figure which shows the 2nd process in the manufacturing method of the speaker which
concerns on embodiment of this invention. It is a figure which shows the structure of the
diaphragm manufactured by the 2nd process. It is a figure which shows the 3rd process in the
manufacturing method of the speaker which concerns on embodiment of this invention. It is a
figure which shows the structure of the said speaker manufactured according to the
manufacturing method of the speaker which concerns on embodiment of this invention.
Explanation of sign
[0039]
DESCRIPTION OF SYMBOLS 10 diaphragm 11 main vibration part 12 inner support part 13 flat
part 14 outer support part 20 yoke 21 bottom part 22 outer peripheral wall part 23 central
cylindrical part 23a recessed part 31 magnet 32 plate 40 diaphragm support 40a support
surface 41 protrusion 50 small diameter voice coil Unit 51 Small diameter voice coil 52 Small
diameter bobbin 55 Large diameter voice coil unit 56 Large diameter voice coil 57 Large
diameter bobbin 61 Inner spacer 61a Convex part 62 Outer spacer 70, 75 Jig G1 First magnetic
gap G2 Second magnetic gap
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