JP2005303902A - Damper for loudspeaker, and the loudspeaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper for loudspeaker which employ woven cloth having flexibility and strength each of which is independent of the axial direction of fibers and thus prevent the occurrence of rolling and improve sound quality, even when a force of large amplitude is exerted to the damper, and to provide the loudspeaker. <P>SOLUTION: The damper 40 for supporting the vibration system of the loudspeaker is formed into a corrugation form by impregnating tetraaxially woven fabric 41 comprising four fibers 43, 44, 45, 46 woven, at mutually an angular difference of about 45 degrees with thermosetting resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker damper and a speaker.

FIG. 1 shows a configuration of a conventional general speaker.
The speaker 1 includes a magnetic circuit 3, a frame 5 to which the magnetic circuit 3 is attached at the rear, and a roll-shaped edge 7 on the outer periphery of the frame 5.
And a voice coil 12 wound around a cylindrical voice coil bobbin 11.

The magnetic circuit 3 includes a cylindrical center pole 15 at the center of a disk-shaped plate 15a.
b is projectingly fitted to the front end side of the center pole 15b so that the magnet 16 is sandwiched between the yoke 15 having a projecting structure, the ring-shaped magnet 16 loosely fitted on the outer periphery of the center pole 15b, and the plate 15a. And a ring-shaped top plate 17 equipped.
A gap between the inner periphery of the top plate 17 and the center pole 15b is a magnetic gap 19 in which the voice coil 12 is disposed.

At the center of the diaphragm 9, an opening 9 a through which the voice coil bobbin 11 is inserted is formed. The edge 7 joined to the outer peripheral edge of the diaphragm 9 is located between the ring-shaped gasket 21 in which the mounting flange portion provided on the outer periphery of the edge 7 is adhered to the edge support portion 5a and the edge support portion 5a. It is fixed to the edge support portion 5a in a form sandwiched between the two. The inner peripheral edge 9b of the diaphragm 9 forming the opening 9a is fixed to the outer periphery of the voice coil bobbin 11 inserted through the opening 9a by adhesion or the like.

In addition, a dust cap 23 is attached to the center of the diaphragm 9. The dust cap 23 covers the front of the voice coil bobbin 11 and prevents entry of dust or the like into the magnetic gap 19.
A cylindrical voice coil bobbin 11 is freely movable in the axial direction, and has a center pole 1
The damper 25 is loosely fitted to the outer periphery of 5b and is restricted from moving in the axial direction.
It is elastically supported by the frame 5 via. Then, the diaphragm 9 is vibrated by the reciprocating vibration of the voice coil bobbin 11 accompanying the input signal to the voice coil 12, and sound reproduction is performed.

The damper 25 is formed into a corrugation shape (bellows shape) in which unevenness is alternately arranged in the radial direction by thermoforming the woven fabric 30 impregnated with a thermosetting resin, and is called a corrugation damper. ing.
The damper 25 has an outer peripheral edge fixed to the damper support portion 5b of the frame 5 and an inner peripheral edge fixed to the outer periphery of the voice coil bobbin 11. The damper 25 restricts radial displacement of the voice coil bobbin 11 and vibrates. When the plate 9 is driven, vibration energy is absorbed by deformation of the corrugation, and the vibration plate 9 is damped.

By the way, as a woven structure of the woven fabric 30 used for the damper 25, as shown in FIG. 2, a biaxial weave (plain weave) in which two fibers 31 and 32 in length and width are generally used (for example, Patent Document 1).
However, in the case of biaxial weaving, the opening angle between the fibers in the vertical and horizontal axial directions is 90 degrees,
There is a large difference in stretchability and strength between the vertical and horizontal fiber directions and the oblique direction (the direction indicated by arrow A in the figure) inclined at an angle of 45 degrees with respect to these fiber directions.

Therefore, when the amplitude of the voice coil bobbin 11 propagates, the stress balance in the woven fabric 30 is lost, and the displacement of the corrugation is distorted. As a result, rolling that hinders the smooth movement of the voice coil bobbin 11 is likely to occur. There was a problem.
The occurrence of rolling causes interference between the voice coil bobbin 11 and the magnetic gap 19 to generate noise, or distorts the vibration of the diaphragm 9 to deteriorate the sound quality.

Therefore, as shown in FIG. 3, a speaker damper using a triaxial woven fabric 33 in which three fibers 34, 35, and 36 are woven at an angle of about 60 degrees from each other has been proposed (for example, , See Patent Document 2).
In such a triaxial woven fabric 33, the opening angle between fibers in each axial direction is 60 degrees, which is narrower than in the case of biaxial weaving, so when an external force acts in a direction different from the axial direction, The tendency of variation in stretchability and strength depending on the direction of the force is improved as compared with the case of biaxial weaving.

Japanese Patent Application Laid-Open No. 11-234796 Japanese Patent Laid-Open No. 10-13992

However, the speaker damper proposed in the above-mentioned Patent Document 2 has an axial direction when a force is applied in a direction inclined at an angle of 30 degrees with respect to the axial direction, as indicated by an arrow B in FIG. As compared with the case where a force is applied along the direction, there is a significant difference in stretchability and strength. As a result, the stress balance in the woven fabric 33 is lost.
For this reason, when a large amplitude force acts on the speaker damper due to an increase in the output of the speaker or the like, the displacement of the corrugation is distorted due to the collapse of the stress balance in the woven fabric 33, and the occurrence of rolling is caused. There was a risk of inviting.

In recent years, home theater systems and in-vehicle theater systems have become widespread, and there is a strong demand for higher output for speakers. For this reason, even if a large amplitude force is applied from the voice coil bobbin, the stress balance in the woven fabric is not lost, and the stretchability and strength of the woven fabric depend on the axial direction so that vibration can be smoothly controlled. Development of an improved speaker damper is strongly desired.
Therefore, in conventional dampers for speakers, the stretchability and strength of the woven fabric strongly depend on the axial direction of the fibers that make up the woven fabric, and rolling is caused by the collapse of the stress balance in the woven fabric during amplitude propagation. The problem of being easily generated is an example.

The invention according to claim 1 is a speaker damper for supporting a vibration system of a speaker, wherein a thermosetting resin is formed on a four-axis woven fabric in which four fibers are woven at an angle of about 45 degrees from each other. Is impregnated into a desired shape.

DESCRIPTION OF EMBODIMENTS Embodiments of a speaker damper and a speaker according to the present invention will be described.
The speaker damper of the present invention is a speaker damper that supports the vibration system of the speaker, and a thermosetting resin is applied to a four-axis woven fabric in which four fibers are woven from each other at an angle of approximately 45 degrees. It is impregnated and formed into a desired shape.

That is, the woven fabric used is a 4-axis weave, and the opening angle between the fibers in each axial direction is about 45 degrees, so that the opening angle is further reduced compared to the conventional 2-axis weaving and 3-axis weaving. By being cornified, the acting force during amplitude propagation is not greatly inclined in each axial direction.
In addition, at the position where each axis intersects, the four fibers are entangled and the binding force between the fibers at the intersection increases, so even if the tension acts in the axial direction, the applied tension remains in each fiber. Dispersed in the axial direction at the intersecting portion and easily absorbed by each fiber as an axial force.
Therefore, stretchability and strength directionality in the woven fabric are lost, and deformation of the speaker damper can be suppressed.

In addition, when the speaker damper of the present invention is formed in a corrugated shape in which irregularities are alternately arranged in the radial direction, a large amplitude force is exerted due to loss of stretchability and strength directionality in the woven fabric. Even when the amplitude is propagated, the stress balance in the woven fabric is prevented from being lost, and the vibration can be damped smoothly by the uniform displacement operation of the corrugation, so the rolling caused by the uneven displacement operation of the corrugation Can be prevented.
Furthermore, the speaker using the speaker damper having the above-described configuration can suppress the deformation of the speaker damper, thereby stabilizing the characteristics and improving the sound quality.

Hereinafter, a speaker damper and a speaker according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 4 is a longitudinal sectional view showing the structure of a speaker according to an embodiment of the present invention, and FIG. 5 shows an embodiment of a woven fabric structure used in the speaker damper shown in FIG. is there.

The speaker 61 shown in FIG. 4 has a magnetic circuit 3, a frame 5 to which the magnetic circuit 3 is attached at the rear, and a roll-shaped edge 7 on the outer periphery fixed to an edge support 5 a at the front of the frame 5. Cone-shaped diaphragm 9 and cylindrical voice coil bobbin 1
1 and a voice coil 12 wound around 1.

The magnetic circuit 3 includes a cylindrical center pole 15 at the center of a disk-shaped plate 15a.
b is projectingly fitted to the front end side of the center pole 15b so that the magnet 16 is sandwiched between the yoke 15 having a projecting structure, the ring-shaped magnet 16 loosely fitted on the outer periphery of the center pole 15b, and the plate 15a. And a ring-shaped top plate 17 equipped.
A gap between the inner periphery of the top plate 17 and the center pole 15b is a magnetic gap 19 in which the voice coil 12 is disposed.

At the center of the diaphragm 9, an opening 9 a through which the voice coil bobbin 11 is inserted is formed. The edge 7 joined to the outer peripheral edge of the diaphragm 9 is located between the ring-shaped gasket 21 in which the mounting flange portion provided on the outer periphery of the edge 7 is adhered to the edge support portion 5a and the edge support portion 5a. It is fixed to the edge support portion 5a in a form sandwiched between the two. The inner peripheral edge of the diaphragm 9 forming the opening 9a is fixed to the outer periphery of the voice coil bobbin 11 inserted through the opening 9a by adhesion or the like.

In addition, a dust cap 23 is attached to the center of the diaphragm 9. The dust cap 23 covers the front of the voice coil bobbin 11 and prevents entry of dust and the like into the magnetic gap 19.
A cylindrical voice coil bobbin 11 is freely movable in the axial direction, and has a center pole 1
It is elastically supported by the frame 5 via a damper (speaker damper) 40 so as to be loosely fitted to the outer periphery of 5b and to be restricted from moving in the axial direction. Then, the diaphragm 9 is vibrated by the reciprocating vibration of the voice coil bobbin 11 accompanying the input signal to the voice coil 12, and sound reproduction is performed.

The damper 40 has an outer peripheral edge fixed to the damper support portion 5b of the frame 5 and an inner peripheral edge fixed to the outer periphery of the voice coil bobbin 11. The damper 40 restricts the radial displacement of the voice coil bobbin 11, and the diaphragm When driving 9, the vibration energy is absorbed by the deformation of the corrugation, and the vibration plate 9 is damped.

The damper 40 of the present embodiment includes a corrugation shape in which unevenness is alternately arranged in the radial direction by storing a woven fabric 41 impregnated with a thermosetting resin such as a phenol resin in a predetermined mold and performing heat molding. Corrugation damper formed into a bellows shape.
Further, as shown in FIG. 5, this damper 40 is a four-axis weaving structure in which a woven fabric 41 is woven by four fibers 43, 44, 45, and 46 being offset from each other by about 45 degrees. ing.

Here, for each of the fibers 43, 44, 45, and 46, for example, various known fibers can be selected in addition to the aromatic polyamide fiber and the phenol fiber, and fibers having different materials for each axial direction are adopted. It is also possible to do.
Moreover, although each fiber 43,44,45,46 may unify an outer diameter, for example,
It is also possible to change the outer diameter of the fiber for each axial direction, such as adopting the slanted axis fibers 45 and 46 as compared with the vertical axis and horizontal axis fibers 43 and 44. .

That is, according to the damper 40 of this embodiment described above, the woven fabric 41 to be used is a four-axis weave, and the opening angle between the fibers in each axial direction is about 45 degrees.
Compared with the conventional biaxial woven fabric and triaxial woven fabric shown in (2), the opening angle is further narrowed, and the acting force during amplitude propagation is not greatly inclined in each axial direction.

Moreover, since the four fibers 43, 44, 45, 46 are entangled with each other at the position where each axis intersects, the fibers are strongly coupled to each other at the intersecting portion 51. For example, as indicated by an arrow C in FIG. Even when the tension is applied at an angle inclined by about 22.5 degrees with respect to the axial direction, the applied tension is dispersed in the axial direction at the intersection 51 of the fibers, and the fibers 43, 4
4, 45, 46 is easily absorbed as an axial force.

The stretchability and strength of the woven fabric 41 are the fibers 4 constituting the woven fabric 41.
Since it does not depend so much on the axial direction of 3, 44, 45, 46 and there is no directionality, the deformation of the damper 40 can be suppressed.
Further, the damper 40 is formed in a corrugation shape in which irregularities are alternately arranged in the radial direction, but even when a large amplitude force acts due to the loss of stretchability and strength directionality in the woven fabric 41, It is possible to prevent the stress balance from being lost in the woven fabric 41 during amplitude propagation, and to smoothly attenuate the vibration by the uniform displacement operation of the corrugation.

Therefore, the damper 40 can prevent the occurrence of rolling due to the uneven displacement operation of the corrugation.
Therefore, in the speaker 61 of the present embodiment, the occurrence of rolling due to the uneven displacement operation of the corrugation is prevented, and the sound quality is improved.
The configurations of the speaker damper and speaker in the present invention, such as fibers, woven fabrics, and speaker dampers, are not limited to the configurations of the above-described embodiments, and can take various forms based on the spirit of the present invention. Of course.

It is a longitudinal cross-sectional view which shows the structure of the conventional speaker. It is explanatory drawing of the woven structure of the woven fabric of the damper for speakers currently used for the speaker shown in FIG. It is explanatory drawing of the woven structure of the other conventional woven fabric. It is a longitudinal cross-sectional view which shows the structure of the speaker which concerns on one Example of this invention. It is explanatory drawing of the woven structure of the woven fabric of the damper for speakers currently used for the speaker shown in FIG.

Explanation of symbols

40 damper (damper for speakers)
41 Woven fabric 43, 44, 45, 46 Fiber 51 Intersection 61 Speaker

Claims (3)

A speaker damper that supports a vibration system of a speaker,
A damper for a speaker formed by impregnating a four-axis woven fabric, in which four fibers are woven from each other at an angle of approximately 45 degrees, and impregnating a thermosetting resin into a desired shape. The speaker damper according to claim 1, wherein the speaker damper is formed in a corrugation shape in which irregularities are alternately arranged in a radial direction. A loudspeaker using the loudspeaker damper according to claim 1.

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