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JP2008283504

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DESCRIPTION JP2008283504
PROBLEM TO BE SOLVED: To provide a speaker diaphragm and a speaker excellent in
reproduction sound quality, which have high adhesive strength between a speaker diaphragm
and a voice coil bobbin and less peak dip in sound pressure frequency characteristics.
SOLUTION: The speaker diaphragm is formed by impregnating a base material with a
thermosetting resin, and the thermosetting resin is cured and molded so as to protrude on the
back side of the speaker diaphragm. The first mounting portion includes an annular mounting
portion whose cross-sectional shape changes along one circumference, and the annular mounting
portion is defined by a cross-sectional shape having an annular groove with which one end of the
voice coil bobbin abuts. A plurality of second mounting portions defined by the cross-sectional
shape are provided, and the first mounting portion and the second mounting portion are
alternately arranged to appear alternately on one circumference of the annular groove, and the
annular direction length The different first attachment parts of L1 appear irregularly, and the
different second attachment parts of annular direction length L2 appear irregularly. [Selected
figure] Figure 2
Speaker diaphragm and speaker using the same
[0001]
The present invention relates to a speaker diaphragm having high bonding strength to a voice
coil bobbin and a speaker using the same, and more particularly to a speaker diaphragm formed
by impregnating a base material with a thermosetting resin, the voice coil bobbin being attached
The present invention relates to a speaker diaphragm including an annular mounting portion.
[0002]
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1
In the speaker, an assembly structure in which an inner peripheral end of a speaker diaphragm
(in particular, a cone type diaphragm) is adhered with an adhesive to a cylindrical side surface of
a cylindrical voice coil bobbin is often used.
Some conventional speakers attempt to reduce the number of assembly steps by devising this
assembly structure. Further, in the speaker, since the adhesive strength between the voice coil
bobbin and the speaker diaphragm affects the characteristics of the sound to be reproduced,
various measures have been made to improve the adhesive strength.
[0003]
In the conventional speaker, a comb-shaped coil bobbin fitting ridge having a plurality of notches
formed in the speaker diaphragm can be formed, and one end of a plurality of band-like or
thread-like spacers can be arranged in each notch of the coil bobbin fitting ridge There is one in
which a coil bobbin is fitted to a coil bobbin fitting protrusion as described above (Patent
Document 1). In this speaker, the outer periphery of the speaker diaphragm is fixed to the frame
with the other end of the spacer interposed between the coil bobbin and one of the inner
magnetic poles forming the magnetic gap of the magnetic circuit, and then the spacer is engaged
with the coil bobbin The present invention relates to an assembly method characterized by
extracting from a notch of a protrusion.
[0004]
Also, there is a conventional speaker diaphragm that improves the adhesive strength between the
voice coil bobbin and the speaker diaphragm according to the applicant of the present invention
(Patent Document 2). As shown in FIG. 2, the speaker diaphragm 5 includes a first diaphragm
portion 5, a second diaphragm portion 6 integrally formed with the first diaphragm portion 5, a
first diaphragm portion 5, and a first diaphragm portion 5. The first diaphragm portion 5 and the
second diaphragm portion 6 have heat as a base material, and are provided with a mounting
portion 7 provided on the back side of the joint portion with the two diaphragm portion 6 so as
to project and be attached to one end of the voice coil bobbin. The curable resin is impregnated,
and the mounting portion 7 is formed by curing the thermosetting resin. This speaker diaphragm
can reduce the transmission loss of the driving force from the voice coil bobbin, and the speaker
using this can improve the S / N ratio.
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2
[0005]
Japanese Patent Application Laid-Open No. 61-5699 (FIG. 2) Patent No. 3846497 (FIGS. 1 to 4)
[0006]
However, even in the case of the speaker diaphragm of Patent Document 2 in which the bonding
strength is enhanced, in the case of a speaker diaphragm having a circular diaphragm shape, a
remarkable high-frequency vibration mode is easily generated, and as a result, the sound
pressure There is a problem that a peak dip appears in the frequency characteristic to cause a
reduction in reproduced sound quality.
[0007]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to achieve high bonding strength between a speaker diaphragm and a voice coil
bobbin and to reduce peak dips in sound pressure frequency characteristics. To provide a
speaker diaphragm and a speaker excellent in reproduction sound quality.
[0008]
The speaker diaphragm according to the present invention is a speaker diaphragm formed by
impregnating a base material with a thermosetting resin, and the thermosetting resin is cured
and molded to protrude on the back side of the speaker diaphragm. A first attachment portion
provided with an annular attachment portion whose cross-sectional shape changes on one
circumference, the annular attachment portion being defined by a cross-sectional shape having
an annular groove with which one end of the voice coil bobbin abuts And a plurality of second
attachment parts defined by a cross-sectional shape different from the parts, and arranged so
that the first attachment parts and the second attachment parts appear alternately on one
circumference of the annular groove, and The first attachment portions having different annular
direction lengths L1 appear irregularly, and the second attachment portions having different
annular direction lengths L2 appear irregularly.
[0009]
Preferably, in the speaker diaphragm of the present invention, the first attachment portion of the
annular attachment portion has an annular groove formed by the inner circumferential side wall
and the outer circumferential side wall against which one end of the voice coil bobbin abuts. The
mounting portion has a cross-sectional shape in which one end of the voice coil bobbin does not
abut.
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3
[0010]
Preferably, in the speaker diaphragm of the present invention, the annular groove of the first
attachment portion has a first groove bottom portion with which one end of the voice coil bobbin
abuts, and the second attachment portion of the annular attachment portion has an inner
circumferential side wall and an outer periphery The annular groove formed by the side wall into
which one end of the voice coil bobbin is inserted, and the annular groove of the second
attachment portion is deeper than the first groove bottom and the end of the voice coil bobbin
does not abut It has a groove bottom.
[0011]
Preferably, in the speaker diaphragm of the present invention, the first attachment portion of the
annular attachment portion is formed by the inner circumferential side wall and the outer
circumferential side wall, one end of the voice coil bobbin is inserted, and one end of the voice
coil bobbin abuts A second mounting portion of the annular mounting portion has a groove, and
has either an inner circumferential side wall or an outer circumferential side wall and an annular
abutment portion with which one end of the voice coil bobbin abuts.
[0012]
Preferably, in the speaker diaphragm of the present invention, the central angle δ1
corresponding to each of the annular direction lengths L1 of the plurality of first attachment
portions and the plurality of second attachment portions on one circumference of the annular
attachment portion The central angle δ2 corresponding to each annular direction length L2 is
set to change in the range of 6 degrees or more and 30 degrees or less.
[0013]
More preferably, in the speaker diaphragm of the present invention, the thermosetting resin is an
unsaturated polyester resin.
[0014]
Furthermore, a speaker according to the present invention includes the above-described speaker
diaphragm of the present invention, and a voice coil bobbin attached to an annular mounting
portion of the speaker diaphragm.
[0015]
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4
Hereinafter, the operation of the present invention will be described.
[0016]
The speaker diaphragm according to the present invention is a speaker diaphragm formed by
impregnating a base material with a thermosetting resin, and the thermosetting resin is cured
and molded to protrude on the back side of the speaker diaphragm. It is provided, and it
comprises an annular attachment portion whose cross-sectional shape changes on one
circumference.
The diaphragm portion of the speaker diaphragm is formed by impregnating the base material
with the thermosetting resin, and the annular attachment portion is formed by curing the
thermosetting resin. By providing a voice coil bobbin to be attached, it is possible to realize a
speaker that has high adhesive strength between the speaker diaphragm and the voice coil,
reduces transmission loss, and can improve the S / N ratio.
[0017]
Here, since the cross-sectional shape of the annular attachment changes on one circumference,
the high-order resonance mode becomes dispersive, and the frequency characteristic that tends
to exhibit a high peak becomes smooth.
Specifically, the annular attachment portion is a first attachment portion defined by a crosssectional shape having an annular groove with which one end of the voice coil bobbin abuts, and
a second attachment portion defined by a cross-sectional shape different from the first
attachment portion. The peak-dip on the sound pressure frequency characteristic can be
smoothed by having a plurality of and.
The first attachment portion and the second attachment portion are arranged to alternately
appear on one circumference of the annular attachment portion, and different first attachment
portions having different annular direction lengths L1 appear irregularly, and the annular
direction length The different second attachment parts of L2 appear irregularly.
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5
Therefore, the high-order resonance mode resulting from the rigidity of the annular attachment
portion of the speaker diaphragm is dispersed, and high peaks and deep dips appearing on the
frequency characteristic become smooth.
[0018]
Here, the first attachment portion of the annular attachment portion of the speaker diaphragm of
the present invention has an annular groove formed by the inner circumferential side wall and
the outer circumferential side wall against which one end of the voice coil bobbin abuts, and the
second attachment of the annular attachment portion The section has a cross-sectional shape in
which one end of the voice coil bobbin does not abut.
That is, in the first attachment portion, one end of the voice coil bobbin abuts on the annular
groove, and the driving force generated by the voice coil wound around the other end of the
voice coil bobbin is directly transmitted to the speaker diaphragm. Since one end of the voice coil
bobbin does not abut on the second attachment portion, the second attachment portion whose
annular direction length L2 changes functions as a portion connecting the plurality of first
attachment portions.
Therefore, high-order resonance modes due to the rigidity of the annular attachment portion of
the speaker diaphragm are dispersed.
[0019]
In addition, if the annular groove of the first attachment portion has a first groove bottom in
contact with one end of the voice coil bobbin, the second attachment portion is formed by the
inner circumferential side wall and the outer circumferential side wall and one end of the voice
coil bobbin is It is sufficient to have an annular groove to be inserted, and the annular groove of
the second attachment portion have a second groove bottom portion where the groove depth is
deeper than the first groove bottom portion and one end of the voice coil bobbin does not abut .
Since the difference in cross-sectional shape between the first attachment portion and the second
attachment portion can be adjusted by the depth of the annular groove, the speaker diaphragm
of the present invention can be easily designed.
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6
[0020]
Also, if the first mounting portion of the annular mounting portion is formed by the inner
circumferential side wall and the outer circumferential side wall, and one end of the voice coil
bobbin is inserted and has an annular groove with which one end of the voice coil bobbin abuts,
annular mounting The second attachment portion of the portion may have any one of the inner
circumferential side wall or the outer circumferential side wall and an annular contact portion
with which one end of the voice coil bobbin abuts.
That is, in the case where the annular attachment portion has an annular groove having a
constant depth at which the annular attachment portion makes a round, the difference in
sectional shape between the first attachment portion and the second attachment portion is either
the inner circumferential sidewall or the outer circumferential sidewall It may be provided by the
presence or absence of
In this case, since one end of the voice coil bobbin abuts on the annular mounting portion over
the entire circumference, the driving force generated by the voice coil is favorably transmitted to
the speaker diaphragm.
On the other hand, since the first attachment portion and the second attachment portion having
different cross sectional shapes and annular direction lengths are arranged to alternately appear
on one circumference of the annular groove, higher order resonance modes are dispersed, High
peaks and deep dips appearing on the frequency characteristics become smooth.
In particular, when the high-order resonance mode of the speaker diaphragm is prominent on the
inner peripheral side of the annular mounting portion, the difference in sectional shape between
the first mounting portion and the second mounting portion is provided depending on the
presence or absence of the inner peripheral side wall. Is effective, while when the high-order
resonance mode of the speaker diaphragm is prominent on the outer peripheral side of the
annular mounting portion, the difference in the cross-sectional shape between the first mounting
portion and the second mounting portion It is effective to set
[0021]
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7
Note that the first attachment parts having different annular direction lengths L1 appear
irregularly, or the second attachment parts having different annular direction lengths L2 appear
irregularly, on one circumference of the annular attachment part. It means that the change of the
shape is not uniform. However, for example, if the second attachment portion of the annular
attachment portion where one end of the voice coil does not abut on a portion of the annulus, the
voice coil may be inclined and attached to the speaker diaphragm. Therefore, in the speaker
diaphragm of the present invention, the central angle δ1 corresponding to the respective
annular direction lengths L1 of the plurality of first attachment portions and the respective
annular shapes of the plurality of second attachment portions on one circumference of the
annular attachment portion The central angle δ2 corresponding to the direction length L2 is set
to change in the range of 6 degrees or more and 30 degrees or less. That is, since the maximum
lengths of the annular direction lengths L1 and L2 are limited to the length corresponding to the
central angle of 30 degrees, as a result, the first attachment portions with which the voice coil
abuts are distributed appropriately. There is no problem such as tilting of the voice coil.
[0022]
In the speaker diaphragm of the present invention, the thermosetting resin is an unsaturated
polyester resin. Therefore, a speaker diaphragm having a ring portion including a diaphragm
portion having a high curing rate and a low curing temperature and easy to manufacture and
having excellent internal loss, a first mounting portion, and a second mounting portion Is
obtained.
[0023]
The speaker diaphragm of the present invention has a high bonding strength between the
speaker diaphragm and the voice coil bobbin, and can realize a speaker excellent in reproduction
sound quality with less peak dip in sound pressure frequency characteristics.
[0024]
The speaker diaphragm of the present invention and the speaker using the same realize a
speaker with high adhesion strength between the speaker diaphragm and the voice coil and little
peak dip in sound pressure frequency characteristics and excellent in reproduction sound quality.
The thermosetting resin is hardened and molded, and it is provided on the back side of the
speaker diaphragm so as to protrude, and has an annular mounting portion whose crosssectional shape changes on one circumference, and the annular mounting portion is a voice. A
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8
plurality of first mounting portions defined by a cross-sectional shape having an annular groove
with which one end of a coil bobbin abuts, and a second mounting portion defined by a crosssectional shape different from the first mounting portion The first mounting portion and the
second mounting portion are alternately arranged so as to alternately appear on one
circumference, and the first mounting portions having different annular direction lengths L1
appear irregularly, and the annular direction length L Second mounting portion having different
is by such irregularly emerge, was realized.
[0025]
Hereinafter, although the speaker diaphragm by the preferable embodiment of this invention and
the speaker using the same are demonstrated, this invention is not limited to these embodiments.
[0026]
FIG. 1 is a schematic cross-sectional view of a speaker 1 according to a preferred embodiment of
the present invention.
The speaker 1 has a speaker diaphragm 5, a voice coil bobbin 2 bonded to the speaker
diaphragm 5, and a voice coil 3 wound around the lower end of the voice coil bobbin 2.
The voice coil 3 is disposed in the magnetic gap of the magnetic circuit 4 and drives the speaker
diaphragm 5 by displacing the inside of the magnetic gap according to the input signal.
The vibration system formed by the speaker diaphragm 5 and the voice coil bobbin 2 is
vibratably supported in the illustrated Z direction by the edge 6 a and the damper 6 b. Further,
on the back side of the speaker diaphragm 5, as described later, an annular mounting portion 7
to which the voice coil bobbin 2 is attached is provided.
[0027]
The speaker diaphragm 5 includes a first diaphragm portion 5a forming a cone-shaped
diaphragm on the outer peripheral side of the annular mounting portion 7 and a second
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9
diaphragm integrally formed in a concave shape on the inner peripheral side of the annular
mounting portion 7 And a portion 5b. The annular attachment portion 7 to which the voice coil
bobbin 2 is attached by an adhesive is provided so as to protrude on the back side of the speaker
diaphragm 5, and at the joint portion between the first diaphragm portion 5a and the second
diaphragm portion 5b. Since the vibration of the voice coil bobbin 2 can be transmitted more
smoothly (without reflection), the transmission loss of the driving force can be prevented. The
back side of the speaker diaphragm 5 is the side to which the voice coil bobbin 2 of the speaker
diaphragm 5 is adhered. Since the annular mounting portion 7 is projected not on the front
surface side of the speaker diaphragm 5 but on the back surface side, a bent portion is formed on
the first diaphragm portion 5a and the second diaphragm portion 5b to form the annular
mounting portion 7 As a result, since the annular attachment 7 is not exposed on the surface side
of the speaker diaphragm 5, the aesthetic appearance of the speaker diaphragm 5 is extremely
excellent. Further, since the annular mounting portion 7 is integrally formed, the manufacturing
process can be simplified, and the annular mounting portion 7 can be prevented from being
separated from the first diaphragm portion 5a and the second diaphragm portion 5b.
[0028]
In the present embodiment, the first diaphragm portion 5a and the second diaphragm portion 5b
of the speaker diaphragm 5 are formed by impregnating a base material with a thermosetting
resin. For example, the base material is a laminate including a natural fiber woven layer and a
natural fiber non-woven layer, and the thermosetting resin may be any suitable thermosetting
resin, but is preferably unsaturated polyester. It is. This is because the first diaphragm portion 5a
and the second diaphragm portion 5b having a high curing speed and a low curing temperature
are easy to manufacture and have excellent internal loss. The aperture diameter of the speaker
diaphragm 5 of the present embodiment is about 13 cm, and the average diaphragm thickness t
is about 0.6 mm except for an annular mounting portion 7 described later.
[0029]
As the substrate, any suitable woven or non-woven fabric may be employed depending on the
application and purpose. It may be a woven fabric or a non-woven fabric alone, or may be a
laminate having a plurality of non-woven fabrics, or a laminate of a woven fabric and a nonwoven fabric. The non-woven fabric typically includes para-aramid fibers, meta-aramid fibers,
rayon fibers, cotton fibers, ultra-high strength polyethylene fibers, polyarylate fibers and the like.
Examples of the woven fabric include poly (trimethylene terephthalate), polyethylene naphthalate
(PEN) fibers and the like. The woven or non-woven fibers may be natural fibers or inorganic
11-05-2019
10
fibers as described above.
[0030]
FIG. 2 is an enlarged view of an essential part for explaining the speaker diaphragm 5 of the first
embodiment constituting the speaker 1. FIG. 2 (a) is a partially enlarged view of the annular
attachment 7 in the central portion of the speaker diaphragm 5 as viewed from the back side,
and FIG. 2 (b) is a cross section of the first attachment 7a of the annular attachment 7. 2C is an
O-B cross-sectional view for explaining the cross section of the second mounting portion 7b of
the annular mounting portion 7. As shown in FIG.
[0031]
The annular attachment portion 7 is formed of resin, and preferably, the annular attachment
portion 7 is formed by curing of a thermosetting resin used for the speaker diaphragm 5. That is,
the annular attachment 7 is preferably molded of unsaturated polyester. Fast curing rates and
low curing temperatures make it easy to manufacture and provide an attachment with excellent
internal losses. In the annular mounting portion 7, the base material of the first diaphragm
portion 5 a and the second diaphragm portion 5 b is impregnated with the thermosetting resin,
and at the same time, the thermosetting resin is molded in the shape portion of the annular
mounting portion 7 of the mold. Since the dropping and curing are performed, the manufacture
is extremely simplified. Specifically, the annular attachment portion 7 is configured such that the
first attachment portions 7a and the second attachment portions 7b having different annular
direction lengths alternately appear on one circumference. As shown in FIGS. 2B and 2C, the first
attachment portion 7a and the second attachment portion 7b have different cross-sectional
shapes in the radial direction (A or B direction) from the center point O.
[0032]
Furthermore, since the annular attachment portion 7 is formed only of the thermosetting resin,
the first diaphragm portion 5a and the second diaphragm portion 5b of the speaker diaphragm 5
formed by impregnating the thermosetting resin into the base material are formed. Internal loss
is higher than that. For example, when the base material is PEN fiber and the thermosetting resin
is unsaturated polyester, internal loss of the annular attachment portion 7 and the first
diaphragm portion 5a (and the second diaphragm portion 5b) The ratio is 3: 1 to 1.2: 1 (the
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11
internal loss of the annular mounting portion 7 is 0.3 to 0.6, and the internal loss of the first
diaphragm portion 5a and the second diaphragm portion 5b is 0 .1 to 0.5). Therefore, the vertical
vibration of the voice coil bobbin 2 is attenuated by the annular attachment portion 7 having a
high internal loss, and the transmission to the first diaphragm portion 5a and the second
diaphragm portion 5b is reduced.
[0033]
As shown in FIG. 2 (b), the first mounting portion 7a is extended from the second diaphragm
portion 5b to the back side from the outer peripheral side wall 9 extending from the first
diaphragm portion 5a to the back side. An annular groove 10 is defined between the inner
circumferential side wall 8 and the outer circumferential side wall 9 including the inner
circumferential side wall 8. One end of the voice coil bobbin 2 is inserted into the annular groove
10 of the annular attachment portion 7, and the voice coil bobbin 2 is adhered in a state of being
sandwiched by the inner circumferential side wall 8 and the outer circumferential side wall 9. For
example, the thickness of the inner circumferential side wall 8 and the outer circumferential side
wall 9 is preferably 0.5 to 20 mm. If it is smaller than 0.5 mm, the adhesive strength is
insufficient, and if it is 20 mm or more, the weight of the annular mounting portion 7 excessively
increases and the sound pressure decreases. A plurality of first attachment portions 7a are
disposed on one circumference of the annular attachment portion 7, and they are disposed such
that different annular direction lengths L1 appear irregularly. The central angle δ1
corresponding to the annular direction length L1 of the first attachment portion 7a is set to
change in the range of 6 degrees or more and 30 degrees or less.
[0034]
On the other hand, as shown in FIG. 2C, the second attachment portion 7b is different from the
first attachment portion 7a defined by the cross-sectional shape having the annular groove 10
with which one end of the voice coil bobbin 2 abuts. Has a cross-sectional shape in which one
end of the In the present embodiment, the second mounting portion 7b has no portion
corresponding to the inner circumferential side wall 8 and the outer circumferential side wall 9
in the first mounting portion 7a, and is formed as if the annular mounting portion 7 is cut away.
The second attachment portion 7 b is a portion that connects the plurality of first attachment
portions 7 a while reducing the weight of the annular attachment portion 7, and one end of the
voice coil bobbin 2 is not bonded. The plurality of second attachment portions 7 b are disposed
between two adjacent first attachment portions 7 a on one circumference of the annular
attachment portion 7, and those having different annular direction lengths L 2 are irregularly
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arranged. It is arranged to appear. In addition, the cross-sectional shape of the 2nd attaching part
7b is not restrict ¦ limited to the shape shown in FIG.2 (c). The cross-sectional shape of the
second attachment portion 7b may be any shape as long as one end of the voice coil bobbin 2
does not abut, and the larger the notch is, the more effective the weight reduction of the annular
attachment portion 7 is.
[0035]
FIG. 6 is a view for explaining the arrangement of the annular direction lengths L1 and L2 of the
first attachment portion 7a and the second attachment portion 7b constituting the annular
attachment portion 7, and the central angle δ1 corresponding to the annular direction lengths
L1 and L2. The shape of the annular mounting portion 7 is described in the form of a table of the
arrangement relationship of and .delta.2. For example, in the case of the first embodiment, the
second attachment portion 7b: δ2 (24 degrees) of the annular direction length L2 is disposed
next to the first attachment portion 7a: δ1 (30 degrees) of the annular direction length L1. , And
then the first mounting portion 7a: δ1 (18 degrees), then the first mounting portion 7b: δ2 (12
degrees), δ1 (12 degrees), δ2 (12 degrees), ..., Then, it arrange ¦ positions so that what differs
in annular direction length may appear irregularly. The sum of central angles δ1 of the plurality
of first attachment portions 7a is 180 degrees, and exactly half of the annular attachment portion
7 is occupied by the first attachment portion 7a, and the other half is the second attachment
portion 7b. It represents being occupied.
[0036]
The central angle δ1 corresponding to the annular direction length L1 of the first attachment
portion 7a and the central angle δ2 corresponding to the annular direction length L2 of the
second attachment portion 7b are each 6 degrees or more and 30 degrees or less It is set to
change in the range of. That is, the annular attachment portion 7 is divided into 60 parts with
respect to the center point O, and one divided element appears as one of 1 to 5 units with 6
degrees which is one divided element as one unit. Irregularity, as described above, may be such
that central angles δ1 and δ2 change to such an extent that they appear in a range of several
units with a predetermined angle as one unit, and are constant as in the comparative example
described later As a result of appearance at a rate of appearance, it is not necessary to form a
uniform annular attachment. Therefore, since the maximum lengths of the annular direction
lengths L1 and L2 are limited to the length corresponding to the central angle of 30 degrees, as a
result, the first attachment portions 7a with which the voice coil bobbin 2 abuts are
appropriately distributed. Therefore, the voice coil 3 is not inclined and does not have a problem
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such as contacting the magnetic gap of the magnetic circuit 4.
[0037]
In the annular mounting portion 7 of the first embodiment, the cross-sectional shape of the
second mounting portion 7b largely changes as compared to the cross-sectional shape of the first
mounting portion 7a on one round, so the high-order resonance mode becomes dispersive, The
peak and dip on the sound pressure frequency characteristics can be smoothed. Moreover, the
first attachment portion 7 a and the second attachment portion 7 b are alternately arranged such
that the annular direction lengths appear irregularly on one circumference of the annular
attachment portion 7. The second mounting portion 7b has a cross-sectional shape in which one
end of the voice coil bobbin 2 does not abut, and connects the plurality of first mounting
portions. Therefore, as described later, the high-order resonance mode resulting from the rigidity
of the annular attachment portion 7 of the speaker diaphragm 5 is dispersed, and the high peak
and deep dip appearing on the frequency characteristic become smooth.
[0038]
FIG. 3 is an enlarged view of an essential part for explaining the speaker diaphragm 5 of the
second embodiment. The second embodiment is substantially the same as the above-described
first embodiment except that the configurations of the speaker diaphragm 5 and the annular
attachment portion 7 are different, so the same reference numerals are given to the common
portions and the description is omitted. . FIG. 3A is a partial enlarged view of the annular
attachment 7 in the central portion of the speaker diaphragm 5 as viewed from the back side,
and FIG. 3B is a cross section of the first attachment 7 a of the annular attachment 7 3C is an O-B
cross-sectional view for explaining the cross section of the second mounting portion 7b of the
annular mounting portion 7. As shown in FIG.
[0039]
In the annular attachment 7 of the second embodiment, the first attachment 7 a and the second
attachment 7 b having different lengths in the annular direction are alternately configured to
appear alternately on one circumference thereof. It is the same as the case of No. 1, and the
configuration of the second mounting portion 7b is different from that of the first embodiment.
That is, as shown in FIG. 3 (b), the configuration with the first attachment portion 7a is the same
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as that of the first embodiment, and as shown in FIG. 3 (c), the second attachment portion 7b.
The cross-sectional shape is different from that of the first embodiment.
[0040]
Specifically, the second attachment portion 7b of the second embodiment has a cross-sectional
shape in which one end of the voice coil bobbin 2 does not abut, and is formed by the inner
circumferential side wall 8 and the outer circumferential side wall 9, and one end of the voice
coil bobbin 2 is inserted Although the same as the first mounting portion 7a in that it has the
annular groove 10b, the depth of the annular groove 10b is different from the depth of the
annular groove 10a of the first mounting portion 7a. That is, if the first attachment portion 7a
has the first groove bottom portion 10a with which one end of the voice coil bobbin 2 abuts, an
annular groove 10b formed by the inner circumferential sidewall 8 and the outer circumferential
sidewall 9 of the second attachment portion 7b. The depth of the groove is deeper than the first
groove bottom 10a, and one end of the voice coil bobbin 2 does not abut.
[0041]
That is, in the second embodiment, the difference in sectional shape between the first mounting
portion 7a and the second mounting portion 7b is realized by the difference in depth between
the first groove bottom portion 10a and the second groove bottom portion 10b. If the depth of
the first groove bottom portion 10a is constant across the plurality of first attachment portions
7a, the depth with the second groove bottom portion 10b is such that one end of the voice coil
bobbin 2 does not abut It is not constant and may change. If the depth of the first groove bottom
portion 10a with which one end of the voice coil bobbin 2 abuts is constant, the voice coil bobbin
2 is not inclined and attached to the speaker diaphragm 5. In addition, the change in the depth of
the second groove bottom 10b is effective in dispersing the high-order resonance mode caused
by the rigidity of the annular attachment 7 of the speaker diaphragm 5 and making the peak dip
smooth. In the case of the second embodiment, as shown in FIG. 6, the arrangement of the
annular direction lengths L1 and L2 of the first mounting portion 7a and the second mounting
portion 7b constituting the annular mounting portion 7 is the first embodiment. Since it is the
same as the case of, the explanation is omitted.
[0042]
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In the speaker diaphragm 5 of the third embodiment, the sectional shapes of the first attachment
portion 7a and the second attachment portion 7b constituting the annular attachment portion 7
are the same as those of the second embodiment shown in FIG. And, as shown in FIG. 6, the
arrangement of the annular direction lengths L1 and L2 of the first attachment portion 7a and
the second attachment portion 7b constituting the annular attachment portion 7 is an
embodiment different from the second embodiment. . About the part common to the case of the
above-mentioned Example 1 or 2, the same number is attached ¦ subjected and illustration and
description are abbreviate ¦ omitted.
[0043]
In the third embodiment, the first attachment portions 7a are arranged such that ones having
different annular direction lengths appear irregularly. As shown in FIG. 6, the central angle δ1
corresponding to each annular direction length L1 of the first attachment portion 7a is set to
change in the range of 6 degrees or more and 18 degrees or less, and the plurality of first
attachment portions 7a The sum of the central angles .delta..sub.1 is 132 degrees. On the other
hand, the second attachment portion 7b where the depth of the groove is deeper than the first
groove bottom 7a and one end of the voice coil bobbin 2 is not in contact is also arranged so that
ones having different annular direction lengths appear irregularly. The central angle δ2
corresponding to each annular direction length L2 of the second attachment portion 7b is set to
change in the range of 6 degrees to 30 degrees, and the sum of the central angles δ2 of the
plurality of second attachment portions 7b is It is 228 degrees.
[0044]
As described above, also in the third embodiment, the central angle δ1 corresponding to the
annular length L1 of the first attachment portion 7a and the central angle δ2 corresponding to
the annular direction length L2 of the second attachment portion 7b Are set to change in the
range of 6 degrees or more and 30 degrees or less. Therefore, since the maximum lengths of the
annular direction lengths L1 and L2 are limited to the length corresponding to the central angle
of 30 degrees, as a result, the first attachment portions 7a with which the voice coil bobbin 2
abuts are appropriately distributed. Therefore, the voice coil 3 is not inclined and does not have a
problem such as contacting the magnetic gap of the magnetic circuit 4.
[0045]
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FIG. 4 is an enlarged view of an essential part for explaining the speaker diaphragm 5 of the
fourth embodiment. The fourth embodiment is substantially the same as the first embodiment
and the second embodiment except for the configurations of the speaker diaphragm 5 and the
annular attachment portion 7, and therefore the same reference numerals are given to the
common portions. Description is omitted. FIG. 4A is a partial enlarged view of the annular
attachment 7 in the central portion of the speaker diaphragm 5 as viewed from the back side,
and FIG. 4B is a cross section of the first attachment 7 a of the annular attachment 7 4C is an O-B
cross-sectional view for explaining the cross section of the second mounting portion 7b of the
annular mounting portion 7. As shown in FIG.
[0046]
In the annular attachment 7 of the fourth embodiment, the first attachment 7a and the second
attachment 7b having different lengths in the annular direction are configured to alternately
appear on one circumference. The second embodiment is the same as the case of the first
embodiment or the second embodiment, and the configuration of the second attachment portion
7b is different from that of the first embodiment or the second embodiment. That is, as shown in
FIG. 4 (b), the configuration with the first attachment portion 7a is the same as that of the first
embodiment or the second embodiment, and as shown in FIG. 4 (c), The cross-sectional shape of
the mounting portion 7b is different from that of the first embodiment or the second
embodiment.
[0047]
Specifically, the second attachment portion 7b of the fourth embodiment has an inner
circumferential side wall 8 and an annular contact portion 10c with which one end of the voice
coil bobbin abuts. That is, the second mounting portion 7 b is common to the first mounting
portion 7 a in that the second mounting portion 7 b has the inner peripheral side wall 8 and the
annular contact portion 10 c with which one end of the voice coil bobbin 2 abuts. It is different in
not having it. Since the annular contact portion 10c is on the same plane as the plane defined by
the annular groove 10 of the first attachment portion 7a, the voice coil bobbin 2 is formed in the
annular groove 10 of the first attachment portion 7a and the annular contact portion 10c. It
abuts, and the voice coil bobbin 2 is not inclined and attached to the speaker diaphragm 5.
[0048]
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17
Further, in the fourth embodiment, since the second attachment portion 7 b does not have the
outer circumferential side wall 9, the high-order resonance mode resulting from the rigidity of
the annular attachment portion 7 of the speaker diaphragm 5 is dispersed to smooth the peak
dip. Can be In particular, in the speaker diaphragm 5 of the fourth embodiment, the difference
between the first mounting portion 7 a and the second mounting portion 7 b appears as the
presence or absence of the outer peripheral side wall 9 of the annular mounting portion 7. The
vibration mode of the corresponding first diaphragm portion 5a of the speaker diaphragm 5 can
be changed. Thus, when the high-order resonance mode of the speaker diaphragm 5 is
prominent on the outer peripheral side of the annular mounting portion 7, the difference in
sectional shape between the first mounting portion 7 a and the second mounting portion 7 b can
It is good to set by the presence or absence of
[0049]
Also in the case of the fourth embodiment, as shown in FIG. 6, the arrangement of the annular
direction lengths L1 and L2 of the first mounting portion 7a and the second mounting portion 7b
constituting the annular mounting portion 7 is the first embodiment or The description is
omitted because it is the same as in the other embodiments.
[0050]
FIG. 5 is an enlarged view of an essential part for explaining a speaker diaphragm 15 of another
embodiment 5 and a speaker 11 using the same.
5 (a) is a cross-sectional view of the speaker 11, FIG. 5 (b) is a cross-sectional view for explaining
the cross-section of the first attachment portion 7a of the annular attachment portion 7, and FIG.
5 (c) is an annular It is a sectional view explaining the section of the 2nd attaching part 7b of
attaching part 7. As shown in FIG. The speaker diaphragm 5 of the first to fourth embodiments
described above has the first diaphragm portion 5a and the second diaphragm portion 5b
integrally formed in a concave shape on the inner peripheral side, The speaker diaphragm 15 of
the fifth embodiment is integrally formed in a first diaphragm portion 15a forming a cone
diaphragm and a convex shape on the inner peripheral side of the annular attachment portion 7
to form a dome diaphragm And the second diaphragm portion 15b.
[0051]
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The first diaphragm portion 5a may form an outer peripheral portion of the speaker diaphragm
15, and the second diaphragm portion 5b may have a function as a dust cap. In the speaker
diaphragm 15, the second diaphragm portion 15b forms a convex dome-shaped diaphragm,
whereby the rigidity of the second diaphragm portion 15b is enhanced. The vibration of the voice
coil bobbin 2 is formed in the annular mounting portion 7 which couples the first diaphragm
portion 5a and the second diaphragm portion 5b by integrally molding the first diaphragm
portion 5a and the second diaphragm portion 5b. Can be transmitted more smoothly, so
transmission loss can be prevented.
[0052]
Therefore, the second diaphragm portion 15b is substantially the same as the speaker diaphragm
5 of the first to fourth embodiments except that the shape of the second diaphragm portion 15b
is different. . Also in the case of the fifth embodiment, as shown in FIG. 6, the arrangement of the
annular direction lengths L1 and L2 of the first attachment portion 7a and the second
attachment portion 7b that constitute the annular attachment portion 7 is the same as that of the
first embodiment. The description is omitted because it is the same as the case.
[0053]
In the annular attachment 7 of the fifth embodiment, the first attachment 7 a and the second
attachment 7 b having different lengths in the annular direction are configured to alternately
appear on one circumference. It is the same as the case of 1-4, and the structure of the 2nd
attaching part 7b is different from the case of previous Examples 1-4. That is, as shown in FIG. 5
(b), the configuration with the first attachment portion 7a is the same as in the first to fourth
embodiments, and as shown in FIG. 5 (c), the second attachment The cross-sectional shape of the
portion 7b is different from that of the first to fourth embodiments.
[0054]
Specifically, the second mounting portion 7b of the fifth embodiment has the outer peripheral
side wall 9 and an annular contact portion 10c with which one end of the voice coil bobbin abuts.
That is, the second attachment portion 7 b is common to the first attachment portion 7 a in that
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the second attachment portion 7 b has the outer circumferential side wall 9 and the annular
contact portion 10 c with which one end of the voice coil bobbin 2 abuts. It is different in not
having it. Further, since the annular contact portion 10c is on the same plane as the plane
defined by the annular groove 10 of the first attachment portion 7a, the voice coil bobbin 2 is
formed with the annular groove 10 of the first attachment portion 7a and the annular contact
portion 10c. And the voice coil bobbin 2 is not inclined and attached to the speaker diaphragm 5.
[0055]
The second mounting portion 7b of the annular mounting portion 7 of the fifth embodiment has
a shape such that the inner peripheral side wall 8 and the outer peripheral side wall 9 in the
second mounting portion 7b of the previous fourth embodiment are interchanged. Therefore, in
the fifth embodiment, since the second attachment portion 7 b does not have the inner
circumferential side wall 8, the high-order resonance mode caused by the rigidity of the annular
attachment portion 7 of the speaker diaphragm 5 is dispersed, and the peak dip is It can be
smooth. In particular, in the speaker diaphragm 15 of the fifth embodiment, the difference
between the first mounting portion 7a and the second mounting portion 7b appears as the
presence or absence of the inner peripheral side wall 8 of the annular mounting portion 7, so the
inner periphery of the annular mounting portion 7 The vibration mode of the second diaphragm
portion 15b of the speaker diaphragm 15 corresponding to the side can be changed. As
described above, when the high-order resonance mode of the speaker diaphragm 15 is
prominent on the inner peripheral side of the annular mounting portion 7, the difference in
sectional shape between the first mounting portion 7 a and the second mounting portion 7 b is It
is preferable to provide with or without the side wall 8.
[0056]
Comparative Examples 1 to 3 shown in the table for explaining the shape of the annular
mounting portion 7 in FIG. 6 (note that they are not shown in the drawings. Each is a
comparative example explaining the difference with the speaker diaphragm of the present
Examples 1-5. In the speaker diaphragms of Comparative Examples 1 and 3, the conventional
annular mounting in which the angle corresponding to the first mounting portion is 360 ° and
there is no angle corresponding to the second mounting portion, that is, the cross-sectional shape
does not change on one circumference In the case of having a part. The speaker diaphragm of
Comparative Example 1 has the concave second diaphragm portion 5b in the same manner as
Examples 1 to 4, and the speaker diaphragm of Comparative Example 3 has the same convex
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shape as in Example 5. And the second diaphragm portion 15b. Further, in the speaker
diaphragm of Comparative Example 2, although the cross-sectional shape changes in one
circumference, the second attachment portion 7b having the same annular direction length L2 is
constant following the first attachment portion 7a having the annular direction length L1. As a
result of the appearance rate, that is, the central angle corresponding to the annular direction
length appearing at 30 °, a conventional uniform annular mounting portion is formed, and the
second concave portion is formed as in the first to fourth embodiments. It is a case where it has
the diaphragm part 5b.
[0057]
FIG. 7 shows the vibration displacement distribution of the speaker diaphragm at a frequency
(here, 8 kHz) at which high-order mode resonance occurs for a speaker including the speaker
diaphragm of this example and the speaker diaphragm of the comparative example. It is a
vibration displacement characteristic distribution map obtained by simulation, and represents the
vibration mode of a speaker diaphragm. The vibration displacement distribution of the speaker
diaphragm is represented by color differences and shading. FIG. 7 (a) of the amplitude
characteristic is the case of the speaker diaphragm 5 of the second embodiment, and FIG. 7 (b) is
the case of the speaker diaphragm 5 of the third embodiment, and FIG. 7 (c). These are the cases
of the speaker diaphragm of the comparative example 1, and FIG.7 (d) is the cases of the speaker
diaphragm of the comparative example 2. Moreover, FIG.
[0058]
In the case of the speaker diaphragm 5 of the second embodiment or the third embodiment, the
cross-sectional shape of the annular mounting portion 7 changes on one circumference.
Specifically, as described above, the difference in sectional shape between the first mounting
portion 7a and the second mounting portion 7b is realized by the difference in depth between
the first groove bottom portion 10a and the second groove bottom portion 10b. . Moreover, since
the first attachment portion 7 a and the second attachment portion 7 b having different annular
direction lengths appear irregularly, as a result, the first diaphragm portion 5 a on the outer
peripheral side of the annular attachment portion 7 and the annular attachment portion 7 The
vibration displacement with the second diaphragm portion 5b on the inner peripheral side
becomes irregular in the circumferential direction. This represents a state in which the vibration
mode of the speaker diaphragm 5 is dispersed, and on the frequency characteristic of the sound
wave radiated from the speaker diaphragm 5, it is possible to smooth the peak dip as described
later. it can.
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[0059]
On the other hand, in the case of the speaker diaphragm of Comparative Example 1, the crosssectional shape of the annular mounting portion 7 does not change on one circumference.
Moreover, in the case of the speaker diaphragm of Comparative Example 2, although the crosssectional shape of the annular mounting portion 7 changes on one circumference, it is a case
where a uniform annular mounting portion is formed. The vibrational displacements of these
conventional loudspeaker diaphragms become circumferentially uniform and regular. These
represent a state in which the vibration mode of the speaker diaphragm is not dispersed, and on
the frequency characteristics of the sound wave radiated from the speaker diaphragm 5, the peak
dip becomes severe as described later.
[0060]
FIG. 8 is a graph showing a frequency characteristic obtained by simulating an on-axis 1-m sound
pressure frequency characteristic of a speaker including the speaker diaphragm of the present
example and the speaker diaphragm of the comparative example. It shows how a peak dip occurs
due to the influence of the vibration mode of the plate. 8A shows the case of the speaker
diaphragm 5 of the second embodiment, FIG. 8B shows the case of the speaker diaphragm 5 of
the third embodiment, and FIG. 8C shows a comparison. This is the case of the speaker
diaphragm of Example 2. In each case, the case of the speaker diaphragm of the conventional
comparative example 1 is described with a dotted line and is contrasted.
[0061]
As can be seen from the graphs of FIGS. 8A and 8B, in the speaker diaphragms of Examples 2
and 3, compared with Comparative Example 1, the peak dip in the frequency band of 8 kHz or
more is higher. It becomes smooth and the reproduction level also decreases. As a result, in the
speaker 1 using the speaker diaphragm 5 of the second and third embodiments, the timbre
unique to the speaker diaphragm is reduced, and the sound quality improvement on the
audibility can be obtained. On the other hand, in the speaker diaphragm of Comparative Example
2 of FIG. 8C, while the improvement is made as compared with the case of Comparative Example
1, for example, the peak level is high at 8 kHz, and the main peak is Not improved.
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[0062]
FIG. 9 is a view for explaining comparison of speakers provided with the speaker diaphragm 15
of the fifth embodiment and the speaker diaphragm of the comparative example 3 (not shown).
These speaker diaphragms are common in that they both have a second diaphragm portion
integrally formed in a convex shape on the inner peripheral side of the annular mounting portion
7 to form a dome-shaped diaphragm, and Only the shape is different. FIG. 9A is a view showing
the vibration displacement distribution of the speaker diaphragm 15 of the fifth embodiment,
and FIG. 9B is a view showing the vibration displacement distribution of the speaker diaphragm
of the third comparative example. Further, FIG. 9C is a graph showing a frequency characteristic
obtained by simulating an on-axis 1 m sound pressure frequency characteristic for a speaker
provided with each of these speaker diaphragms.
[0063]
In the speaker diaphragm 15 of the fifth embodiment, since the second attachment portion 7b of
the annular attachment portion 7 does not have the inner circumferential side wall 8, the second
attachment portion 7b of the annular attachment portion 7 has the second attachment portion
7b. The rigidity is different from that of the mounting portion 7a. Therefore, the vibration mode
of the speaker diaphragm 15 is changed as compared with Comparative Example 3 having a
uniform annular attachment portion, and in particular, the second diaphragm portion of the
speaker diaphragm 15 corresponding to the inner peripheral side of the annular attachment
portion 7 In 15b, the vibration mode is dispersed. As a result, in the speaker 11 using the
speaker diaphragm 15 of the fifth embodiment, the largest peak in the vicinity of 14 kHz
becomes smoother than in the case of the comparative example 3, and the timbre unique to the
speaker diaphragm is reduced. , Can improve the hearing quality of the sound.
[0064]
Although the preferred embodiments of the present invention have been described, the present
invention is not limited to these embodiments. The annular attachment portion of the speaker
diaphragm of the present invention is defined by a first attachment portion defined by a crosssectional shape having an annular groove with which one end of the voice coil bobbin abuts, and
a cross-sectional shape different from the first attachment portion. If a plurality of second
mounting portions are provided, the first mounting portion and the second mounting portion are
11-05-2019
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alternately arranged to appear alternately on one circumference of the annular groove, and the
annular direction length L1 is different. The present invention is not limited to the above
embodiment as long as the first attachment portions appear irregularly and the second
attachment portions different in annular direction length L2 appear irregularly. The arrangement
of the annular direction lengths L1 and L2 is not limited to that in the above embodiment, but
may be arranged so that ones having different annular direction lengths appear irregularly. By
changing the cross-sectional shape of the annular mounting portion 7 on one circumference, it is
possible to disperse the vibration mode and to reduce the peak dip on the sound pressure
frequency characteristic.
[0065]
The speaker diaphragm of the present invention can be suitably applied to a speaker used for
various applications (home use, car use). Furthermore, it can be applied to any speaker, such as a
woofer playing particularly in the low frequency range or a tweeter playing in the high frequency
range. Further, the speaker diaphragm of the present invention is applicable not only to the
speaker but also to a microphone provided with a slender diaphragm.
[0066]
It is a figure explaining the speaker 1 by preferable embodiment of this invention. (Example 1) It
is a figure explaining the speaker diaphragm 5 by preferable embodiment of this invention.
(Example 1) It is a figure explaining the speaker diaphragm 5 by preferable embodiment of this
invention. (Example 2, 3) It is a figure explaining the speaker diaphragm 5 by the preferable
embodiment of this invention. (Example 4) It is a figure explaining the speaker diaphragm 15 by
other preferable embodiment of this invention, and the speaker 11 using the same. (Example 5)
FIG. 16 is a view for explaining the arrangement of the annular direction lengths L1 and L2 of
the first attachment portion 7a and the second attachment portion 7b which constitute the
annular attachment portion of the speaker diaphragm. It is a vibration displacement distribution
figure of the speaker diaphragm by the preferable embodiment of this invention. (Examples 2
and 3 and Comparative Examples 1 and 2) A graph showing the on-axis 1 m sound pressure
frequency characteristics of the speaker diaphragm 5 according to a preferred embodiment of
the present invention. (Examples 2 and 3 and Comparative Examples 1 and 2) It is a figure
explaining comparison of a speaker provided with the speaker diaphragm 15 by the preferred
embodiment of the present invention, and the conventional speaker diaphragm, respectively.
(Example 5 and Comparative Example 3)
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Explanation of sign
[0067]
Reference Signs List 1 speaker 2 voice coil bobbin 3 voice coil 4 magnetic circuit 5 speaker
diaphragm 5a first diaphragm portion 5b second diaphragm portion 6a edge 6b damper 7
annular mounting portion 7a first mounting portion 7b second mounting portion 8 inner
circumferential side wall 9 Outer peripheral side wall 10 annular groove 10a first groove bottom
10b second groove bottom 10c annular contact portion 11 speaker 15 speaker diaphragm 15a
first diaphragm portion 15b second diaphragm portion
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