JP2007288689A - Edge for speakers - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that a fatigue failure easily occurs in root portions of an edge roll and that sound quality is reduced by reflection of vibration or the like in the root portions of the edge roll. <P>SOLUTION: An edge 22 for speakers comprises an edge roll 23 with an approximately semi-circular-arc cross-sectional shape, an inner circumference side flange portion 24 extending from an inner circumference side root portion 23a of the edge roll 23 and bonded to the outer edge of a diaphragm 8, and an outer circumference side flange portion 25 extending from an outer circumference side root portion 23b of the edge roll 23 and bonded to a speaker frame 6. In such an edge 22 for speakers, the cross-sectional shape of the outer circumference side root portion 23b and/or the inner circumference side root portion 23a of the edge roll 23 is formed in the arc shape of an ellipse 27. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker edge that couples the outer periphery of a diaphragm to a speaker frame.

1A is a longitudinal sectional view of a conventional speaker unit 101, and FIG. 1B is a sectional view of an edge (speaker edge) 9 used in the speaker unit 101 shown in FIG. 1A. is there.
In the speaker unit 101 shown here, a speaker frame 6 is coupled to an upper part of a magnetic circuit 5 constituted by a lower plate 2 having a center pole 1, a ring-shaped magnet 3, and a ring-shaped upper plate 4. An edge 9 coupled to the outer peripheral portion of the diaphragm 8 together with the gasket 7 is coupled to the peripheral portion of the frame 6 by bonding or the like, and a voice coil 10 is adhesively coupled to the center portion of the diaphragm 8. The lower part of the voice coil 10 is fitted into the magnetic gap 12 of the magnetic circuit 5 without being eccentrically held by the damper 11, and the dust cap 13 is attached to the center upper surface of the diaphragm 8.

In the speaker unit 101, the edge 9 is coupled to the speaker frame 6 so that the outer periphery of the diaphragm 8 can be displaced in the axial direction. Generally, the edge 9 extends along the radial direction of the diaphragm 8 as shown in FIG. An edge roll 15 having a substantially semicircular cross section, and an inner peripheral flange 16 that extends from an inner peripheral base (inner peripheral edge) 15a of the edge roll 15 and is joined to the outer peripheral edge of the diaphragm 8; The outer peripheral side flange portion 17 that extends from the outer peripheral side base portion (outer peripheral edge) 15b of the edge roll 15 and is joined to the edge support portion 6a of the speaker frame 6 is provided.
Further, as shown in FIG. 1B, the inner periphery side root portion 15a and the outer periphery side root portion 15b are configured to be connected to the flange portions 16 and 17 in a cross-sectional shape that is bent at an angle close to a substantially right angle. Things are widespread (see, for example, Patent Document 1 and Patent Document 2).

International Publication No. 2004/004410 Pamphlet JP 2004-48678 A

By the way, the edge 9 is required to have the following various performances.
(1) Airtightness that blocks air flow before and after the diaphragm.
(2) Vibration performance that does not resonate with the vibration of the diaphragm (anti-resonance performance).
(3) Damping performance that quickly attenuates vibration of the diaphragm.
In order to provide such various performances in a well-balanced manner, improvements have been accumulated in the material, cross-sectional shape, and the like that form the edge 9.

For example, in the case of Patent Document 1, when the amplitude of the diaphragm 8 is large, the outer peripheral side flange portion from the inner peripheral side root portion 15a of the edge roll 15 so that the edge roll 15 does not extend and the elastic restoring force is not impaired. The cross-sectional shape is set so that the thickness gradually increases toward the outer peripheral edge of 17.
In Patent Document 2, the edge roll 15 is formed into an elliptical arcuate arc shape so as to obtain an amplitude margin that allows a large amplitude of the diaphragm 8.

However, as in Patent Document 1 and Patent Document 2, when the cross-sectional shape of each base portion 15a, 15b of the edge roll 15 is bent at an angle close to a substantially right angle, the elastic characteristics change suddenly at this bent portion. Therefore, when the vibration from the diaphragm 8 is propagated to the inner periphery side root portion 15a and when it is propagated to the outer periphery side root portion 15b, reflection of vibration or abnormal vibration may occur, which may deteriorate sound quality. was there.
Further, since stress during vibration propagation concentrates on the bent base portions 15a and 15b, fatigue failure is likely to occur in each of the base portions 15a and 15b, and it is difficult to improve durability. was there.

  The problems to be solved by the present invention include the problem that the sound quality is deteriorated due to the reflection of vibrations at the roots of the edge rolls and the occurrence of abnormal vibrations, which occur in the above-described prior art, and the roots of the edge rolls. Examples of the problem are that fatigue failure is likely to occur and it is difficult to improve durability.

  The speaker edge according to claim 1 is an edge roll having a substantially semicircular cross-sectional shape, and an inner peripheral flange that extends from the inner peripheral base of the edge roll and is joined to the outer peripheral edge of the diaphragm. And an edge for a speaker that is coupled to the speaker frame so that the outer periphery of the diaphragm can be displaced in the axial direction. The cross-sectional shape of the outer periphery side root part and / or the inner periphery side root part of the edge roll is formed in an elliptical arc shape.

Hereinafter, preferred embodiments of the speaker edge according to the present invention will be described.
(1) The speaker edge according to the embodiment of the present invention is joined to the outer peripheral edge of the diaphragm extending from the inner peripheral side root portion of the edge roll and the edge roll having a substantially semicircular arc-shaped cross section. An inner flange portion and an outer flange portion extending from the outer base of the edge roll and joined to the speaker frame, the outer periphery of the diaphragm being axially displaceable to the speaker frame In the edge for a speaker to be coupled, the outer peripheral side root portion and / or the inner peripheral side root portion of the edge roll is formed in an elliptical arc shape.

According to the configuration described in (1) above, since the cross-sectional shape of each root portion of the edge roll is an elliptical smooth arc, the elastic characteristics do not change abruptly at each root portion, and vibration propagation The direction change is also gradual.
As a result, when the vibration from the diaphragm is propagated to the inner periphery base and when it is propagated to the outer periphery base, it is difficult for vibration reflection and abnormal vibration to occur. It is possible to prevent a decrease in sound quality due to the occurrence.
In addition, since the cross-sectional shape of each root part of the edge roll is an elliptical smooth arc shape, vibrations propagating to these base parts are easily dispersed, and stress during vibration propagation is concentrated on each base part. It can prevent acting. Further, even when the vibration plate greatly swings up and down and the edge rolls are fully extended and tension is applied to each base portion, mechanical stress due to the tension can be dispersed. As a result, fatigue failure hardly occurs at each root portion of the edge roll, and durability can be improved.

(2) Preferably, in the embodiment described in the above (1), the cross section of the outer peripheral side root portion and / or the inner peripheral side root portion of the edge roll is an arc shape whose surface is an ellipse, and the back surface. It is good to set it as the structure formed in the arc shape of a perfect circle.
In this way, the cross section of the outer periphery side root portion and / or the inner periphery side root portion of the edge roll is in a form in which the wall thickness is not uniform and gradually changes, and the elastic characteristics and vibration characteristics associated with the wall thickness change. By the change, it is possible to improve the anti-resonance performance and the damping performance.

(3) Further preferably, in the embodiment described in (1) above, the outer peripheral side root portion of the edge roll is formed in an elliptical arc shape, and the inner peripheral side root portion of the edge roll is formed. It is preferable that the cross-sectional shape is formed in a perfect circular arc shape.
With such a configuration, the vibration from the diaphragm can be quickly propagated into the edge roll by the propagation surface having a substantially uniform curvature at the root of the inner periphery of the edge roll, which is the starting edge of vibration input from the diaphragm. In the base part of the outer periphery of the edge roll, which is the terminal part that receives the stress of vibration, the vibration is effectively attenuated by the propagation surface with a smoothly changing curvature, and the vibration is less reflected to the diaphragm side. Performance and vibration control performance can be obtained.

(4) Furthermore, more preferably, in the embodiment described in any one of (1) to (3) above, the arc shape of the ellipse is an arc shape in the minor axis direction of the ellipse. good.
With such a configuration, the cross-sectional shape of each base portion becomes a curved shape extending in the axial direction of the diaphragm, and the radial dimension of the diaphragm is shortened, so that the effective area of the diaphragm is increased. Can be planned.

(5) Furthermore, more preferably, in the embodiment described in any one of (1) to (3), the arc shape of the ellipse is an arc shape in the major axis direction of the ellipse. .
With this configuration, the cross-sectional shape of each base portion is a curved shape extending in the radial direction of the diaphragm, making it easier to disperse vibration during vibration propagation and during vibration propagation acting on the root portion of the edge roll. It becomes possible to further reduce the stress.

(6) Further preferably, in the embodiment described in any one of the above (1) to (5), the edge roll gradually increases in thickness from the inner periphery toward the outer periphery. And good.
(7) Furthermore, more preferably, in the embodiment described in any one of (1) to (5) above, the edge roll gradually increases in thickness from the outer periphery toward the inner periphery. And good.
(8) Furthermore, more preferably, in the embodiment described in any one of (1) to (7), a reinforcing material is provided at least in the vicinity of the outer peripheral side root and / or the inner peripheral side root. An embedded structure is recommended.
With such a configuration, the elastic modulus of the edge roll gradually changes from the inner circumference side to the outer circumference side as the wall thickness changes, so that the anti-resonance performance is maintained without changing the outer dimensions of the edge roll. It is possible to adjust the vibration damping performance and the edge performance corresponding to the reproduction frequency range of the speaker unit, the input resistance, and the like.

  Further, specific examples of the above embodiment are shown below. The configuration of the speaker unit shown in the first to fifth embodiments is the same except for the speaker edge. Therefore, in the second and subsequent embodiments, the description of the speaker unit configuration is omitted, and the speaker edge configuration is omitted. Only the configuration will be described.

  2A is a longitudinal sectional view of the first embodiment of the speaker unit using the speaker edge according to the present invention, and FIG. 2B is a diagram of the speaker edge used in the speaker unit of FIG. FIG. 2C is an enlarged cross-sectional view, and FIG. 2C is a cross-sectional view showing a modification of the cross-sectional shape of the speaker edge used in the speaker unit of FIG.

  In the speaker unit 21 shown in FIG. 2A, a speaker frame 6 is coupled to an upper portion of a magnetic circuit 5 constituted by a lower plate 2 having a center pole 1, a ring-shaped magnet 3, and a ring-shaped upper plate 4. Then, an edge (speaker edge) 22 coupled to the outer peripheral portion of the diaphragm 8 together with the gasket 7 is coupled to the peripheral portion of the speaker frame 6 by bonding or the like, and the voice coil 10 is bonded to the central portion of the diaphragm 8. The middle part of the voice coil 10 is held by the damper 11 and the lower part of the voice coil 10 is fitted into the magnetic gap 12 of the magnetic circuit 5 without being eccentric, and the dust cap 13 is pasted on the central upper surface of the diaphragm 8. It has a configuration attached.

  In the speaker unit 21, the edge 22 of this embodiment is coupled to the speaker frame 6 so that the outer periphery of the diaphragm 8 can be displaced in the axial direction, and as shown in FIG. , And an inner peripheral side flange portion that extends from an inner peripheral side base (inner peripheral edge) 23 a of the edge roll 23 and is joined to the outer peripheral edge of the diaphragm 8. 24, and an outer peripheral side flange portion 25 that extends from the outer peripheral base portion (outer peripheral edge) 23 b of the edge roll 23 and is joined to the edge support portion 6 a of the speaker frame 6.

  And as shown in FIG.2 (b), as for the outer periphery side root part 23b and the inner periphery side root part 23a of the edge roll 23, as for all, the cross-sectional shape along the radial direction of the diaphragm 8 has a short diameter and It is formed in an arc shape of an ellipse 27 whose major axis is appropriately selected.

  In the case of this embodiment, the arc shape of the ellipse 27 is an arc shape in which the minor axis direction of the ellipse is aligned with the radial direction of the diaphragm 8.

Further, the speaker edge 22 is formed by molding a known material conventionally used, such as rubber or urethane.
Further, each part of the speaker edge 22 can be structured such that a reinforcing material such as fiber fiber is sandwiched between the above-mentioned material layers such as rubber and urethane, and further, each root part 23a that increases the load due to vibration stress. , 23b, a reinforcing material may be embedded in the vicinity.

  In the above-described speaker edge 22 according to the first embodiment, since the cross-sectional shape of the base portions 23a and 23b of the edge roll 23 is a smooth arc having an ellipse 27, the elastic characteristics of the base portions 23a and 23b change abruptly. In addition, the change of the propagation direction of vibration is also a gradual change. As a result, when the vibration from the diaphragm 8 is propagated to the inner peripheral side root portion 23a and when propagated to the outer peripheral side root portion 23b, reflection of vibration and abnormal vibration are less likely to occur. It is possible to prevent a decrease in sound quality due to the occurrence of abnormal vibration.

  In addition, since the cross-sectional shape of each root portion 23a, 23b of the edge roll 23 is a smooth arc shape of an ellipse 27, vibration propagating to these root portions 23a, 23b is easily dispersed, Can be prevented from concentrating on the base portions 23a and 23b. As a result, fatigue failure hardly occurs at the base portions 23a, 23b of the edge roll 23, and durability can be improved. Further, even when the vibration plate greatly swings up and down and the edge rolls are fully extended and tension is applied to each base portion, mechanical stress due to the tension can be dispersed.

  In the case of the present embodiment, the arc shape of the ellipse 27 that determines the cross-sectional shape of each base portion 23a, 23b is the arc shape in the minor axis direction of the ellipse 27, so the cross-sectional shape of each base portion 23a, 23b is The curved shape of the diaphragm 8 extends in the axial direction, and the radial dimension of the diaphragm 8 is shortened, so that the effective area of the diaphragm 8 can be increased.

Note that the direction of the ellipse 27 that determines the curvature of the base portions 23a and 23b is not limited to the above embodiment.
As shown in FIG. 2 (c), the curvatures of the base portions 23 a and 23 b may be arc shapes in the major axis direction of the ellipse 27.
With such a configuration, the cross-sectional shape of each base portion 23a, 23b is a curved shape that extends long in the radial direction of the diaphragm 8, making it easy to disperse vibration during vibration propagation, and to the base portion of the edge roll 23. It becomes possible to further reduce the stress at the time of propagation of the acting vibration.

3A is a longitudinal sectional view of a speaker unit using the speaker edge according to the second embodiment of the present invention, and FIG. 2B is a diagram of the speaker edge used in the speaker unit of FIG. It is an expanded sectional view.
The speaker edge 31 of the second embodiment extends from an edge roll 23 having a substantially semicircular cross section along the radial direction of the diaphragm 8, and an inner peripheral side base (inner peripheral edge) 23a of the edge roll 23. An outer periphery that is extended from the outer peripheral side base (outer peripheral edge) 23b of the inner peripheral side flange portion 24 that is put out and joined to the outer peripheral edge of the diaphragm 8 and is joined to the edge support portion 6a of the speaker frame 6 In the point provided with the side flange part 25, it is common with Example 1. FIG.

  However, in the case of the second embodiment, the cross sections of the outer peripheral side root portion 23b and the inner peripheral side root portion 23a of the edge roll 23 are formed in an arc shape of an ellipse 27 as in the first embodiment. The back surface of each base part 23a, 23b is formed in the arc shape 32 of a perfect circle.

  If it does in this way, the cross section of the outer periphery side base part 23b and the inner periphery side base part 23a of the edge roll 23 will be in the form which thickness changes not gradually, and the elastic characteristic and vibration characteristic accompanying a change in thickness are obtained. As a result of this change, it is possible to improve anti-resonance performance and damping performance.

FIG. 4A is a longitudinal sectional view of a third embodiment of the speaker unit using the speaker edge according to the present invention, and FIG. 4B is a diagram of the speaker edge used in the speaker unit of FIG. It is an expanded sectional view.
The speaker edge 34 according to the third embodiment extends from an edge roll 23 having a substantially semicircular cross section along the radial direction of the diaphragm 8, and an inner peripheral side base (inner peripheral edge) 23 a of the edge roll 23. An outer periphery that is extended from the outer peripheral side base (outer peripheral edge) 23b of the inner peripheral side flange portion 24 that is put out and joined to the outer peripheral edge of the diaphragm 8 and is joined to the edge support portion 6a of the speaker frame 6 In the point provided with the side flange part 25, it is common with Example 1. FIG.

  However, in the case of the third embodiment, the outer peripheral side base portion 23b of the edge roll 23 is formed in the arc shape of the ellipse 27 similar to that of the first embodiment on both the front and back surfaces. As for the cross-sectional shape of the inner periphery side root part 23a, both the front surface and the back surface are formed in a perfect circular arc shape.

  With such a configuration, at the inner peripheral side root portion 23a of the edge roll 23 which is the input start end of vibration from the diaphragm 8, the vibration from the diaphragm 8 is quickly transferred to the edge roll by the propagation surface having a substantially uniform curvature. The outer peripheral side root 23b of the edge roll 23, which can be propagated into the terminal 23 and is subjected to vibration stress, efficiently attenuates the vibration by the propagation surface of the elliptical arc whose curvature changes smoothly. It is possible to obtain excellent vibration performance and vibration suppression performance with less reflection of vibration to the 8 side. Further, even when the vibration plate greatly swings up and down and the edge rolls are fully extended and tension is applied to each base portion, mechanical stress due to the tension can be dispersed.

FIG. 5 (a) is a longitudinal sectional view of a speaker unit using a speaker edge according to a fourth embodiment of the present invention, and FIG. 5 (b) is a diagram of the speaker edge used in the speaker unit of FIG. 5 (a). It is an expanded sectional view.
The speaker edge 36 of the fourth embodiment extends from an edge roll 23 having a substantially semicircular cross section along the radial direction of the diaphragm 8, and an inner peripheral side base (inner peripheral edge) 23a of the edge roll 23. An outer periphery that is extended from the outer peripheral side base (outer peripheral edge) 23b of the inner peripheral side flange portion 24 that is put out and joined to the outer peripheral edge of the diaphragm 8 and is joined to the edge support portion 6a of the speaker frame 6 In the point provided with the side flange part 25, it is common with Example 1. FIG.

However, in the case of the fourth embodiment, the edge roll 23 is configured so that the thickness t gradually increases from the inner periphery toward the outer periphery.
With such a configuration, the edge roll 23 gradually changes in elasticity coefficient from the inner peripheral side to the outer peripheral side with the change of the wall thickness t, so the outer dimensions of the edge roll 23 are not changed. It becomes possible to adjust the anti-resonance performance and damping performance, and it becomes easier to obtain edge performance according to the use of the reproduction frequency range and input resistance of the speaker unit.

FIG. 6A is a longitudinal sectional view of Embodiment 5 of the speaker unit using the speaker edge according to the present invention, and FIG. 6B is a diagram of the speaker edge used in the speaker unit of FIG. It is an expanded sectional view.
The speaker edge 38 of the fifth embodiment is an improvement of the speaker edge 36 of the fourth embodiment, and the edge roll 23 is gradually increased from the outer periphery toward the inner periphery, contrary to the case of the fourth embodiment. The thickness t is increased.
Even in such a configuration, the edge roll 23 gradually changes in elastic coefficient from the inner peripheral side to the outer peripheral side as the wall thickness changes, so without changing the outer dimensions of the edge roll 23, It becomes possible to adjust the anti-resonance performance and vibration suppression performance, and it becomes easier to obtain edge performance according to the use of the speaker unit reproduction frequency range, input resistance, and the like.

  In any of the above-described speaker edges, the inner flange portion 24 and the outer flange portion 25 are preferably thin in terms of facilitating the amplitude of the diaphragm 8. Therefore, even when the thickness of the edge roll 23 is gradually increased toward one flange portion as in the fourth embodiment and the fifth embodiment, the flange portion connected to the thick edge roll 23 is as thin as possible. It is good to.

As described above in detail, the speaker edge 22 according to the embodiment of the present invention extends from the edge roll 23 having a substantially semicircular arc cross-sectional shape and the inner peripheral side root portion 23 a of the edge roll 23. And an inner peripheral flange portion 24 joined to the outer peripheral edge of the diaphragm 8 and an outer peripheral flange portion 25 extending from the outer peripheral base portion 23b of the edge roll 23 and joined to the speaker frame 6. In the speaker edge 22 that is coupled to the speaker frame 6 so that the outer periphery of the diaphragm 8 can be displaced in the axial direction,
The cross-sectional shape of the outer peripheral side root portion 23b and / or the inner peripheral side root portion 23a of the edge roll 23 is formed in an arc shape of an ellipse 27.

Thereby, since the cross-sectional shape of each base part 23a, 23b of the edge roll 23 is a smooth arc with an ellipse 27, the elastic characteristics do not change abruptly at each base part 23a, 23b, and the propagation direction of vibrations The conversion is also a gradual conversion.
As a result, when the vibration from the diaphragm 8 is propagated to the inner peripheral side root portion 23a and when propagated to the outer peripheral side root portion 23b, reflection of vibration and abnormal vibration are less likely to occur. It is possible to prevent a decrease in sound quality due to the occurrence of abnormal vibration.

  In addition, since the cross-sectional shape of each base portion 23a, 23b of the edge roll 23 is a smooth arc shape of an ellipse 27, vibration propagating to each of the base portions 23a, 23b is easily dispersed, and at the time of vibration propagation Can be prevented from concentrating on the base portions 23a and 23b. As a result, fatigue failure hardly occurs at the base portions 23a, 23b of the edge roll 23, and durability can be improved. Further, even when the vibration plate greatly swings up and down and the edge rolls are fully extended and tension is applied to each base portion, mechanical stress due to the tension can be dispersed.

(A) is a longitudinal cross-sectional view of a conventional speaker unit, and (b) is an enlarged cross-sectional view of an edge (speaker edge) used in the speaker unit shown in (a). (A) is a longitudinal cross-sectional view of Example 1 of the speaker unit using the speaker edge according to the embodiment of the present invention, and (b) is an enlarged cross section of the speaker edge used in the speaker unit of (a). FIG. 4C is a cross-sectional view showing a modification of the cross-sectional shape of the speaker edge used in the speaker unit of FIG. (A) is a longitudinal cross-sectional view of Example 2 of the speaker unit using the speaker edge according to the embodiment of the present invention, and (b) is an enlarged cross section of the speaker edge used in the speaker unit of (a). FIG. (A) is a longitudinal cross-sectional view of Example 3 of the speaker unit using the speaker edge according to the embodiment of the present invention, and (b) is an enlarged cross section of the speaker edge used in the speaker unit of (a). FIG. (A) is a longitudinal cross-sectional view of Example 4 of the speaker unit using the speaker edge according to the embodiment of the present invention, and (b) is an enlarged cross section of the speaker edge used in the speaker unit of (a). FIG. (A) is a longitudinal cross-sectional view of Example 5 of the speaker unit using the speaker edge according to the embodiment of the present invention, and (b) is an enlarged cross section of the speaker edge used in the speaker unit of (a). FIG.

Explanation of symbols

6 Speaker Frame 8 Diaphragm 21 Speaker Unit 22 Speaker Edge 23 Edge Roll 23a Inner Perimeter Base 23b Outer Perimeter Base 24 Inner Periphery Flange 25 Perimeter Outer Flange 27 Ellipse 31, 34, 36, 38 Speaker Edge 32 Perfect circle arc shape

Claims (8)

An edge roll having a substantially semicircular cross-sectional shape, an inner peripheral flange portion that extends from an inner peripheral base portion of the edge roll and is joined to an outer peripheral edge of the diaphragm, and an outer peripheral base portion of the edge roll An outer flange portion extending from the outer periphery and joined to the speaker frame, and at the speaker edge that is coupled to the speaker frame so that the outer periphery of the diaphragm is axially displaceable,
An edge for a speaker, wherein a cross-sectional shape of an outer peripheral side root portion and / or an inner peripheral side root portion of the edge roll is formed in an elliptical arc shape.   The cross section of the outer periphery side root part and / or inner periphery side root part of the edge roll is formed in an arc shape with an ellipse on the front surface and an arc shape with a perfect circle on the back surface. Speaker edge.   The cross-sectional shape of the outer peripheral side root portion of the edge roll is formed in an elliptical arc shape, and the cross-sectional shape of the inner peripheral side root portion of the edge roll is formed in a perfect circular arc shape. The edge for speakers described in 1.   The speaker edge according to claim 1, wherein the arc shape of the ellipse is an arc shape of an ellipse in a minor axis direction.   The speaker edge according to claim 1, wherein the arc shape of the ellipse is an arc shape in the major axis direction of the ellipse.   The speaker edge according to claim 1, wherein the edge roll gradually increases in thickness from an inner periphery toward an outer periphery.   The speaker edge according to claim 1, wherein the edge roll gradually increases in thickness from the outer periphery toward the inner periphery. The speaker edge according to any one of claims 1 to 7, wherein a reinforcing material is embedded at least in the vicinity of the outer periphery side root portion and / or the inner periphery side root portion.

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