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JP2002010390

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2002010390
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
support member constituting a speaker used in various types of audio equipment, and to a
speaker edge as a sound insulation member.
[0002]
2. Description of the Related Art With the recent trend toward smaller and higher performance of
speaker systems, there has been a demand for a speaker system capable of reproducing deep
bass along with the spread of high quality sources. In order to enable deep bass reproduction
with a small aperture, it is necessary to increase the flexibility of the support system, vibrate the
diaphragm of the speaker to a large extent, and increase the volume velocity, from small input to
large input. There is a demand for a vibration system supporting part, such as an edge or a
damper, which gives an amplitude with good linearity to a driving force generated in a voice coil.
[0003]
Here, a conventional speaker edge will be described with reference to FIGS. 7 and 8. FIG.
[0004]
FIG. 7 is a cross-sectional view of a roll portion of a foamed urethane edge which is a
conventional speaker edge joined to the outer peripheral portion of a diaphragm, and FIG. 8 is a
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raw material of the foamed urethane.
[0005]
In FIG. 7 and FIG. 8, 1 is a speaker edge, 2 is a roll portion of a urethane foam edge, 3 is a flat
portion continuously formed on the outer peripheral portion of the roll portion 2, and the
speaker frame Bonded to (not shown).
The reference numeral 4 denotes a bonding portion continuously formed on the inner peripheral
portion of the roll portion 2 to which the outer peripheral portion of the diaphragm 5 is bonded.
In general, urethane foam is relatively air-permeable, and is compressed about 10 to 20 times to
a thickness of 5 to 8 mm, and is heat-molded to form an edge shape.
[0006]
The operation of the above speaker edge will be described.
[0007]
When an input is applied to the speaker and the diaphragm vibrates back and forth, each point
on the surface of the roll portion 2 of the speaker edge 1 moves in the radial direction.
That is, when the diaphragm 5 is displaced forward by the convex roll-like speaker edge 1 as
shown in FIG. 7, each point on the surface of the roll portion 2 moves to the outer diameter side.
When the diaphragm 5 is displaced rearward, each point on the surface of the roll portion 2
moves to the inner diameter side. Therefore, each point on the surface of the roll unit 2 at rest
has a circumferential length at that position, but when it is displaced to the outer diameter side,
the circumferential length becomes long and the lack of The elongation compensates, and when
it is displaced to the inner diameter side, the circumferential length becomes short and the
remaining part is absorbed by the shrinkage of the material. Therefore, the urethane foam edge
is a good edge material with less generation of abnormal noise due to abnormal deformation with
respect to the vibration amplitude.
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[0008]
SUMMARY OF THE INVENTION However, the conventional speaker edge as described above has
the following problems. Although it is a foamed urethane edge having excellent stretchability,
since the breaking strength at the limit of elongation is small, a tension phenomenon of the
speaker edge 1 occurs at a large vibration amplitude to break the chain of the foamed urethane,
and finally The speaker edge 1 is broken. 2. Certain types of foamed urethane edges undergo
chemical change when irradiated with light, particularly ultraviolet light, for a long time,
breaking chains at the molecular level and consequently breaking them in combination with
mechanical stress. 3. When exposed to a high temperature and high humidity atmosphere for
a long time, a certain type of urethane foam edge undergoes a chemical change called hydrolysis,
and the chain breaks at the molecular level, resulting in a break due to mechanical stress. Had
the task of
[0009]
The present invention provides a speaker edge which solves the above-mentioned problems
without inhibiting the high stretchability of the urethane foam.
[0010]
[Means for Solving the Problems] In order to solve the above-mentioned problems, the edge for a
speaker according to claim 1 of the present invention uses a foam-like substrate comprising at
least urethane foam, and this foam-like substrate The composite base is made of a reinforcing
material having higher stretchability as compared with the material after molding of the material
and having high tensile strength at the tensile limit, and is formed by heat molding press, The
high stretchability of the foam-like substrate, high internal loss, high stretchability of the fiber
itself constituting the reinforcing material, and a structure rich in flexibility make it possible to
cause abnormal deformation of the edge in the deformation state of the edge at large amplitude.
It is possible to provide a speaker edge which can suppress the occurrence and can prevent the
edge breakage even from the repetition of the tension of the edge at the time of large amplitude.
[0011]
According to a second aspect of the present invention, there is provided an edge for a speaker
according to the second aspect of the present invention, the reinforcing material comprising a
highly elastic open weave or knit processed by natural fibers, synthetic fibers, or composite
fibers thereof. A foam-like substrate obtained by impregnating or applying a foamed resin
solution and then foaming the foamed resin solution is formed by heat molding press, and it is
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formed by using the stretchability of urethane in the deformation state at the time of large
amplitude. The urethane foam is prevented by the high tensile strength at the limit of elongation
of a highly elastic woven or knitted reinforcing material formed of fibers disposed inside the
cross section in the tension state acting on the edge while preventing the generation of wrinkles.
Provide a speaker edge that can reinforce the tensile strength of the edge and prevent breakage
of the urethane foam edge at the amplitude limit of the edge It is intended.
[0012]
According to a third aspect of the present invention, there is provided an edge for a speaker
according to the second aspect of the present invention, wherein a reinforcing material of mesh
structure made of metal mesh or heat resistant resin material is used as the reinforcing material
of claim 2. By using the stretchability of urethane to prevent the occurrence of ecbo and
wrinkles, and by improving the tensile strength against deformation by the reinforcing material
of the mesh structure disposed inside the cross section, foaming at the edge of the amplitude
limit It is possible to provide a speaker edge that can prevent breakage of the urethane edge.
[0013]
According to a fourth aspect of the present invention, there is provided an edge for a speaker
according to the second aspect, wherein a plurality of reinforcing members are arranged in the
tangential direction or the radial direction, and a relatively small number of reinforcing members
are provided. Since the material is arranged in axial symmetry, the stretchability of the urethane
foam can be used effectively to prevent abnormal deformation due to large amplitude, and the
reinforcement material arranged in axial symmetry is limited to the tension at large amplitude. It
is possible to provide a speaker edge in which the urethane portion does not break in order to
exert a drag on the amplitude.
[0014]
According to a fifth aspect of the present invention, there is provided an edge for a speaker
according to the second aspect, the third aspect or the fourth aspect, which is obtained by heat
pressing of the foam-like substrate of the second or third aspect. By removing the high density
front and back film parts by known means such as a hot wire or a cutter, the mass of the edge
acting as the vibration system mass can be reduced, and the output sound pressure level of the
speaker can be improved.
[0015]
According to a sixth aspect of the present invention, there is provided an edge for a speaker
according to the sixth aspect of the present invention, which comprises at least a surface, a back
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surface or a plurality of foams of foamed urethane foam base material obtained by cutting a
reinforcing material made of high stretchability film to a predetermined thickness. The laminate
base material inserted into the middle layer of the urethane foam base material is formed by heat
molding press, and by arranging the high elasticity film in the edge cross section, the
deformation of the urethane foam at the time of large amplitude In the state, the stretchability of
the urethane foam is used to prevent the occurrence of ecbo and wrinkles, and at the limit of the
elongation of the reinforcing material made of a highly stretchable film disposed inside the cross
section in the tension state acting on the edge. High tensile strength reinforces the tensile
strength of the urethane foam edge and prevents breakage of the urethane foam edge at the
amplitude limit of the edge With wear, it is those that can provide a speaker edge which prevents
breathable, the hydrolysis of the absorbed suppress foaming urethane moisture.
[0016]
According to a seventh aspect of the present invention, there is provided an edge for a speaker
according to the sixth aspect, wherein a black urethane film is used as the high stretchability film
according to the sixth aspect, and the urethane foam is irradiated with light and ultraviolet rays
are extended for a long time. It is possible to provide a speaker edge capable of preventing
breakage of the chain of urethane foam molecules that may occur when irradiated.
[0017]
According to an eighth aspect of the present invention, there is provided an edge according to
the eighth aspect of the present invention, which has a predetermined thickness of a reinforcing
material made of a highly elastic open weave or knitted fabric processed with natural fibers or
synthetic fibers or composite fibers thereof. It is formed by heating and pressing a laminated
base inserted into at least the surface, the back, or a plurality of intermediate layers of the foamlike base of a plurality of foamed urethanes of the urethane foam-like base material which has
been cut. The material and the foam-like substrate can be formed separately, and in particular,
since the foam-like substrate is obtained by cutting pan-like foamed urethane to a predetermined
thickness, the cost required for the urethane foaming process can be reduced. An inexpensive
speaker edge can be provided.
[0018]
A speaker edge according to a ninth aspect of the present invention uses a metal mesh or a heat
resistant resin material of a mesh structure as the reinforcing material according to the eighth
aspect, and in addition to the features of the eighth aspect, a large deformation is made. The
reinforcing material of the mesh structure disposed inside the cross section in the state has a
flexible structure, and prevents the occurrence of ecbo and wrinkles by using the stretchability of
urethane, and the mesh structure of the mesh structure disposed inside the cross section The
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reinforcing material can improve the tensile strength against deformation, and can prevent
breakage of the urethane foam edge at the amplitude limit of the edge.
[0019]
According to a tenth aspect of the present invention, there is provided an edge for a speaker,
wherein the urethane foam material according to any one of the first to sixth aspects or the
eighth aspect is a urethane foam colored with ether and colored black, It is possible to prevent
breakage of the chain of the urethane foam molecules which may occur when the urethane foam
is irradiated with light and irradiated with ultraviolet rays for a long time, and it is possible to
finally provide a speaker edge excellent in weather resistance.
[0020]
According to an eleventh aspect of the present invention, there is provided an edge for a speaker,
wherein the material of the urethane fiber forming the reinforcing material according to any one
of the first to fourth aspects or the eighth aspect is an ether-based urethane fiber and colored
black. It is possible to prevent breakage of the urethane molecule chain that may occur when
light is irradiated to the urethane fiber and ultraviolet light is irradiated for a long time, and a
speaker edge excellent in weather resistance can be finally provided. It is a thing.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker edge according
to the present invention will be described below with reference to FIGS. 1 to 6. FIG.
[0022]
(First Embodiment) The first embodiment mainly describes claims 2, 3, 4, and 5, and FIG. 1
shows one embodiment of the present invention. FIG. 2A is a cross-sectional view of an initial
state of the composite substrate of the speaker edge, and FIGS. 2B and 2C are heating of the
speaker edge. It is sectional drawing which shows the state of the composite base material before
carrying out shaping | molding press.
[0023]
Referring to FIG. 2 (a), 10 is a coarse mesh structure reinforcing material made of urethane fiber
or the like, 11 is passed through the urethane foam liquid tank and the reinforcing material 10 of
the mesh structure is made. It is a foamed urethane resin liquid impregnated and attached to the
surface thereof.
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[0024]
As shown in FIG. 2 (b), the foamed urethane resin solution 11 is foamed to form a foam-like
urethane 12 around the reinforcing material 10 of the mesh structure to form a foam-like
composite substrate (a) 13. ing.
Reference numeral 14 denotes a film quality portion formed on the surface of the foam urethane.
[0025]
FIG. 2 (c) shows a foam composite substrate (b) by slicing it into a uniform thickness in order to
remove the dense membrane part 14 from the foam composite substrate (a) 13 described above.
15 is formed.
[0026]
According to FIG. 1, 20 is a main portion of the speaker edge, 21 is a roll portion of the urethane
foam edge, and 22 is a flat portion continuously formed on the outer peripheral portion of the
roll portion 21. It is joined to a frame (not shown).
Reference numeral 23 denotes a bonding portion formed continuously on the inner peripheral
portion of the roll portion 21 to which the outer peripheral portion of the diaphragm 24 is
bonded.
The speaker edge 20 is formed of the foam composite substrate (a) 13 or the foam composite
substrate (b) 15 by a heat molding press in order to reduce the weight of the edge portion. is
there.
[0027]
In the speaker edge 20 configured as described above, the foamed urethane edge is less likely to
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generate an abnormal sound due to the abnormal deformation with respect to the vibration
amplitude, and the reason is a good speaker edge 20 as explained in the prior art. It is omitted
because it is the same as.
The speaker edge 20 according to the first embodiment uses the reinforcing material 10 having a
mesh structure that is a more flexible urethane fiber having high stretchability and high tensile
strength inserted in the cross section of the urethane foam. Therefore, it works without inhibiting
the high stretchability of the urethane foam.
Then, for a large vibration amplitude, that is, in a tension phenomenon at a critical displacement,
the tensile strength of a small urethane foam edge is supplemented by reinforcing material 10
made of a material having high elasticity such as urethane fiber and high tension. Thus, the
urethane foam edge can be prevented from breaking at the joint with the frame or the diaphragm
24.
[0028]
From the above contents, 1) the occurrence of the abnormal sound associated with the abnormal
deformation with respect to the vibration amplitude can be reduced, and a good speaker edge 20
can be provided.
2) In the tension phenomenon at the critical displacement, the urethane foam edge 20 is used as
a frame or the like by supplementing the tensile strength of a small urethane foam edge with a
reinforcing material 10 made of a material having high stretchability and high tension such as
urethane fibers. It is possible to provide a speaker edge 20 which can be prevented from being
broken at a junction with the diaphragm 24.
3) Furthermore, by removing the film quality part 14, it is possible to provide a speaker edge
which is lightweight and can improve the sound pressure level of the speaker.
[0029]
A plurality of reinforcing members 10 may be arranged in the tangential direction or the radial
direction to produce the foam composite substrate (a) 13, and the speaker edge 20 may be
formed by a heat forming press. It is possible to enable provision of a speaker edge 20 having
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the following effects.
[0030]
Second Embodiment A second embodiment of the present invention will be described with
reference to FIG. 3 and FIG.
The same parts as in the first embodiment are assigned the same reference numerals and
explanations thereof will be omitted.
[0031]
FIG. 3 is a cross-sectional view of the main part of the speaker edge according to the second
embodiment of the present invention, and FIG. 4 is a cross-sectional view showing the state of the
composite base before the heat molding press of the speaker edge. It is.
The speaker edge of the present invention will be described with reference to FIGS. 3 and 4.
[0032]
In FIG. 4, reference numeral 10 denotes a reinforcing material of mesh structure made of
urethane fibers, which may be dipped in a urethane adhesive.
31a and 31b are foam-like base materials of urethane foam cut to a predetermined thickness,
and the reinforcing material 10 is inserted into the intermediate layer to form a laminated base
material 32.
In the second embodiment of the present invention, although the reinforcing material 10 is
inserted into the intermediate layer of the foam-like base materials 31a and 31b, a plurality of
intermediate layers are provided and arranged on one side of the front surface or the back
surface. It goes without saying that the functions and effects of the reinforcing member 10 are
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also the same and are included in the technical category.
[0033]
The speaker edge 30 shown in FIG. 3 is formed by subjecting the laminated base material 32 to
heat molding press, and the structure is the same as the structure shown in FIG.
[0034]
Although the configuration shown in the second embodiment is finally equivalent to that of the
first embodiment, the manufacturing process is different.
That is, Embodiment 1 impregnates the foamed urethane resin solution 11 in the reinforcing
material 10, and after the foaming process, entangles the foamed urethane edge with the
reinforcing material 10 to form the foam composite substrate (a) 13, or an edge In order to
reduce the weight of the foam, the foam-like composite base material (b) 15 is formed by slicing
to a uniform thickness in order to remove a film quality portion having a large surface density. In
the case, the reinforcing material 10 and the foam base 31a, 31b can be formed separately, and
in particular, the foam base 31a, 31b is a laminated base by cutting pan-like foamed urethane to
a predetermined thickness. The material 32 is obtained.
[0035]
From the above contents, the effects described in the first embodiment are 1) prevention of
occurrence of abnormal sound due to abnormal deformation with respect to vibration amplitude,
and 2) edge breakage in the tension phenomenon at the critical displacement. In addition to the
improvement of the sound pressure level of the speaker by the prevention and 3) elimination of
the film quality part, the cost required for the foaming step of 4) urethane can be reduced, and
an inexpensive speaker edge 30 can be provided.
[0036]
Although in the first and second embodiments, the reinforcing member 10 is formed of a mesh
structure of urethane fibers or the like, it is processed and formed by natural fibers, synthetic
fibers or their composite fibers or metal mesh. It goes without saying that the same function and
effect can be obtained even if it is made of the highly elastic open weave or knit.
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[0037]
Third Embodiment The third embodiment of the present invention will be described with
reference to FIGS. 5 and 6. FIG.
The same parts as in the first embodiment and the second embodiment are assigned the same
reference numerals and explanations thereof will be omitted.
[0038]
FIG. 5 is a cross-sectional view of an essential part of the speaker edge according to the third
embodiment of the present invention, and FIG. 6 is a cross-sectional view showing the state of the
composite base before heat-pressing the speaker edge. is there.
[0039]
In FIG. 6, 50a and 50b are preferably high-elasticity film reinforcements of about 40 microns
made of a urethane colored resin colored in black, which does not transmit light, and have a
predetermined thickness (eg, 7 mm). The foam-like base material 51 of the urethane foam
urethane cut into the) is inserted between the said film reinforcements 50a and 50b, and the
lamination | stacking base material 52 is formed.
[0040]
The speaker edge 60 shown in FIG. 5 is formed by pressing the laminated base material 52 by
heat molding and pressing the foam-like base material 51, and 61 is a roll portion of the
urethane foam edge, 62 is The flat portion is continuously formed on the outer peripheral
portion of the roll portion 61, and is joined to the frame (not shown) of the speaker.
Reference numeral 63 denotes a bonding portion formed continuously on the inner peripheral
portion of the roll portion 61 to which the outer peripheral portion of the diaphragm 64 is
bonded.
[0041]
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The speaker edge 60 configured as described above is cut into a thickness of 7 mm and the
black-colored ether-based 40 micron ether-based urethane film reinforcing members 50a and
50b colored in black. A test piece 1 in which a laminated base material 52 is formed of a foamlike base material 51 made of foamed urethane and heat-molded and pressed to a thickness of
0.7 mm, and a test piece 2 using a transparent 40 micron ether urethane film reinforcing
material, The wet heat deterioration test and the weather resistance test were conducted using
the test piece 3 in which only the foam-like base material without the reinforcing material was
heat-formed and pressed.
The conditions of the wet heat deterioration test are temperature: 70 ° C., humidity: 95%, and
standing time: 1500 hours.
As a result, in comparison of the test piece 1 and the test piece 3, the tensile strength was about
3.3 times and there was no change after the test.
The elongation percentage of the test piece 1 was slightly better than that of the test piece 3. The
test piece 1 showed almost no change before and after the test, and the test piece 3 deteriorated
about 10% after the test.
[0042]
The weathering test was conducted under the conditions of temperature: 60 ° C., time: 300
hours.
There was a clear advantage in the order of test piece 1, test piece 2 and test piece 3.
[0043]
As described above, a reinforcing material of a highly elastic film made of a urethane colored
resin colored in black, which does not transmit light, is disposed, and a foam-like base of etherbased urethane foam is cut to a predetermined thickness. Material is inserted between the abovementioned film reinforcing materials to form a laminated base material and formed by a heat
molding press, 1) utilizing the stretchability of the urethane foam in the deformation state at the
time of large amplitude of the urethane foam The urethane foam edge 60 is prevented by the
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high tensile strength at the limit of elongation of the reinforcing members 50a and 50b made of
a highly stretchable film disposed inside the cross section in the tension state acting on the edge,
while preventing the occurrence of the exfoliation and wrinkles. While reinforcing the tensile
strength of the foam and preventing breakage of the urethane foam edge 60 at the amplitude
limit of the edge, A speaker edge capable of preventing the hydrolysis of urethane foam by
suppressing air permeability, absorption of moisture, and transmission of light (ultraviolet light),
and preventing breakage of molecular level chains due to ultraviolet light to prevent mechanical
deterioration of urethane urethane. It can be provided.
[0044]
From the above contents, the effects described in the first and second embodiments of the
present invention are: 1) prevention of generation of abnormal sound due to abnormal
deformation with respect to vibration amplitude, 2) tension phenomenon in critical displacement
In addition to the edge breakage prevention for the speaker, 3) it is possible to provide the
speaker edge which can prevent the mechanical strength deterioration of the urethane foam
accompanied by the chemical change due to the hydrolysis and the ultraviolet light because the
urethane foam is not exposed to moisture and ultraviolet light It is.
[0045]
In the third embodiment of the present invention, the reinforcing members 50a and 50b are
disposed on the front and back of the foam-like substrate 51. However, when disposed on one
surface, the reinforcing materials 50a and 50b are exposed to humid atmosphere and irradiated
with light. Function or effect of reinforcing material 50 even if it is arranged by providing an
intermediate layer of foam-like substrate 51 on at least one side in the case of a urethane foam
which is resistant to hydrolysis or ultraviolet radiation. It goes without saying that they are
similar and are included in the technical category.
[0046]
As described above, the edge for a speaker according to the present invention is more stretchable
than a foam-like substrate such as urethane foam and a material after molding of the foam-like
substrate. And a reinforcing material made of fibers with high tensile strength at the tension
limit, coarse weaves or knits, or resin film, etc., after foaming urethane resin liquid is
impregnated and applied to the reinforcing material or cut to a predetermined thickness By
forming a composite base material formed by laminating the formed foam base material and
reinforcing material by heat molding and forming it, occurrence of abnormal deformation or
wrinkles in the deformed state of the edge at the time of large amplitude It is possible to provide
a speaker edge that can be suppressed and that breakage can be prevented even from repeated
tensioning of the edge at the limit amplitude.
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[0047]
Brief description of the drawings
[0048]
1 is a cross-sectional view of the main part of the speaker edge which is the first embodiment of
the present invention
[0049]
Fig.2 (a) Sectional drawing of the initial state of the composite base material of the edge for the
same speakers
[0050]
3 is a cross-sectional view of the main part of the speaker edge of the second embodiment of the
present invention
[0051]
Fig. 4 is a cross-sectional view showing the state of the composite base before heat-molding and
pressing the speaker edge.
[0052]
5 is a cross-sectional view of the main part of the speaker edge of the third embodiment of the
present invention
[0053]
Fig. 6 is a cross-sectional view showing the state of the composite base before heat-molding and
pressing the speaker edge.
[0054]
Fig. 7 Cross section of the roll part of the conventional urethane foam edge
[0055]
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Fig. 8 A diagram showing the raw material of foamed urethane of the conventional speaker edge
[0056]
Explanation of sign
[0057]
DESCRIPTION OF SYMBOLS 10 Reinforcement material 11 Foaming urethane resin liquid 12
Foam-like urethane 13 Foam-like composite base material (a) 14 Membrane material part 15
Foam-like composite base material (b) 20 Edge 21 for speakers of Embodiment 1 Roll of
urethane foam edge Part 22 Flat part 23 Bonding part 24 Diaphragm 30 Speaker edge 31a, 31b
of Embodiment 2 Foam base 32 Stack base 50a, 50b Highly elastic film reinforcement 51 Foam
base 52 Stack base 60 Loudspeaker edge 61 of Embodiment 3 Roll portion 62 of urethane foam
edge Flat portion 63 Joint portion 64 Diaphragm
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