JP2995454B2 - Center holding member for speaker and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various kinds of audio equipment, and a damper for accurately holding a diaphragm at a predetermined position of a magnetic circuit, or an outer peripheral edge of the diaphragm attached to a frame. And a manufacturing method for manufacturing the center holding member for a loudspeaker. More specifically,
The present invention relates to a center holding member for a loudspeaker, in which rigidity in the circumferential direction is made uniform by increasing rigidity in a circumferential direction, and a method of manufacturing the same, in a damper or an edge made of a woven fabric having directionality according to a weaving method.

[0002]

2. Description of the Related Art A damper for accurately holding a diaphragm of a speaker at the center of a magnetic circuit, or an edge for holding the diaphragm on a frame by being connected to an outer peripheral edge of the diaphragm, are collectively referred to as a center. It is called a holding member. The center holding member is usually formed of a plain woven fabric material in which warp and weft are interlaced one by one, or a twill weave such as a twill weave in which three or more warps and wefts are combined. Often.

[0003] However, these woven fabrics have warp or weft stiffness because the warp and the weft intersect at a substantially right angle, but are 45 ° to the warp and the weft.
Is extremely weak in the direction of. That is, as shown in FIG. 9, the woven fabric composed of the warp yarns 20 and the weft yarns 21 has no yarn in the DE direction (a direction at 45 ° to the warp yarns 20 and the weft yarns 21). extremely weak against bending DE direction, when applied to a speaker, the shape of the gap between the thread and the thread to the vertical vibration is greatly changed, a significant change in f ₀ is caused, in the worst In this case, there has been a problem that tearing occurs radially in the 45 ° direction. In the drawing, 22 is a gap formed by the warp yarn 20F and the weft yarn 21, and 23 is a phenol resin impregnated.

In order to solve such a problem of the center holding member, for example, Japanese Patent Application Laid-Open No. 63-146 discloses a method.
In Japanese Patent No. 692, the waveform is divided into a plurality of portions by a straight line radially extending from the center of the damper having a radial shape. A speaker capable of reproducing high-quality bass has been proposed.

[0005]

SUMMARY OF THE INVENTION The aforementioned Japanese Patent Application No. 63-14 / 1988
The loudspeaker disclosed in Japanese Patent Publication No. 6692 divides a damper into six by a radially extending straight line, changes the height of adjacent waveforms, and limits amplitude with less distortion in a deep waveform portion and amplitude limitation in a shallow waveform portion. In addition, a motion with little distortion is obtained as a whole up to the amplitude limit. However, in this loudspeaker, no consideration has been given to the directionality due to the weaving of the cloth material.
The rigidity in the 45 ° direction is small with respect to the warp and the weft, and as a result, the problems described in the section of the related art have not been solved at all.

In view of the above situation, the present invention relates to a center holding member such as a damper or an edge for a speaker made of a woven fabric having directionality depending on a weaving method. It is an object of the present invention to provide a center holding member that effectively imparts rigidity, thereby making the rigidity uniform over the entire circumference, and a method of manufacturing the same.

[0007]

According to a first aspect of the present invention, there is provided a mounting hole or a damper for mounting a voice coil bobbin at a center portion by a woven fabric in which a warp and a weft are orthogonal to each other. Close the disc-shaped holding substrate with the mounting hole to
The thickness in the mold cavity formed by
Of a pair of molds divided into a plurality of parts radially from the center
In the mold cavity, the holding substrate is laid against its warp and weft.
The part along the 45 ° direction is the mold cavity with a small mold thickness.
And place it in the mold cavity so that it
45 ° direction to the warp and weft of the holding substrate by pressure
To increase the rigidity of the part along
A center holding member for a loudspeaker characterized by imparting a high rigidity .

According to a second aspect of the present invention, a warp yarn is provided.
And a weft thread perpendicular to the voice coil
Connect with the mounting hole for the bottle or the outer edge of the damper.
In a disk-shaped holding base material having a mounting hole formed therein,
Preliminarily dry by impregnating the entire holding base material with phenol resin, etc.
After drying, 45 ° to warp and weft of the holding substrate
Only the part along the direction is impregnated again with phenolic resin, etc.
Increasing the rigidity of the holding base material in the 45 ° direction with respect to the warp and weft
To provide almost uniform rigidity in the entire circumferential direction
A center holding member for a speaker characterized by the following.

According to a third aspect of the present invention, the holding base material constituting the damper or the edge is formed by a woven fabric in which the warp and the weft are orthogonal to each other, and the woven fabric is made of phenol resin or the like.
When impregnating with water and applying heat and pressure to form a damper or edge, the inside of the mold cavity formed by closing
Multiple parts radiating from the center so that the thickness differs between adjacent parts
Using a pair of molds divided into minutes, the holding base material is
And the part along the 45 ° direction to the weft is the thickness of the mold
Place it in the mold cavity so that it is the site of the small cavity
Then, the warp and weft of the holding substrate are
By increasing the rigidity of the part along the 45 ° direction with respect to the yarn,
It is characterized by giving the body a substantially uniform rigidity in the circumferential direction.
This is a method of manufacturing a center holding member for a speaker .

According to a fifth aspect of the present invention, the holding substrate constituting the damper or the edge is formed of a woven fabric in which the warp and the weft are orthogonal to each other, and the woven fabric is impregnated with a phenol resin or the like. After being pre-dried, the remaining base material is masked at portions other than the 45 ° direction with respect to the warp and weft yarns, and only at the 45 ° direction portions not masked again.
A method of manufacturing a center holding member for a speaker, characterized in that a phenol resin or the like is spray-impregnated and molded by heating and pressing with a mold.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a center holding member constituting a damper or an edge is made of a woven fabric in which a warp and a weft are orthogonal to each other. A woven fabric material or a twill woven fabric material in which three or more warp yarns and weft yarns are combined can be given.

Such a holding member has relatively high rigidity in the warp or weft directions, but has a 45-degree rigidity against the warp and the weft.
Low rigidity in the ° direction and no strength in the circumferential direction. Therefore, when forming the holding member using a cloth material having a directivity by weaving the invention Hakakaru, Oh intended to high noodles rigidity 45 ° direction with respect to the warp and weft
You .

One means for this is the closing of a pair of molds used in forming a damper or edge.
The thickness of the mold cavity formed by
From the center of the part amount along the 45 ° direction with respect to the longitudinal <br/> yarn and weft holding substrate and partitioned into a plurality of portions in a radial type fossa mold
Arranged such that the thickness of a small part, of the mold hot pressing
In this method, the compression of the holding base material in the 45 ° direction is strengthened to increase the rigidity.

Another means is to use phenol resin on the cloth material.
Etc. predried then impregnated with, when this is molded by heating and pressing the damper or an edge by the mold, together with masking the other portions along the direction of 45 ° to the warp and weft, Tsu masking commercialization This is a method of increasing the rigidity by spray impregnating the phenol resin or the like again only on the portion along the 45 ° direction.

When the rigidity in the 45 ° direction is increased by using the former divided mold, it is basically required to close the mold .
A-1d in the circumferential direction (FIG. 3 of the mold to be formed I
It is desirable to increase or decrease the thickness of the mold cavity in the -B direction) , but as shown in FIG. The thickness of the mold cavity in the shape portion may be made constant. In addition, as shown in FIG. 4, the thickness of the belt-shaped portion having a predetermined width may be reduced constantly along the direction of 45 ° with respect to the warp and the weft.

[0016] Such pairs warp and weft by the pair of molds to
Imparting stiffness to the 45 ° direction that is performs by caulking radially partition the mold in a plurality from the center, different thicknesses of the mold fossa formed by aligned closed the sectioned mold next to each other although, as specifically shown in FIG. 5, the mold between the point O'and the point O in FIG. 2 (upper die 10
The thickness of the mold cavity g generated by the closing between the mold and the lower mold 10) may be made constant, and as shown in FIG. 6, a convex for giving a corrugation corrugation in the circumferential direction to the holding base material. By setting the thickness of the mold cavity g ′ generated by closing the upper mold 10 and the lower mold 10 to be smaller than the thickness of the mold cavity g of other parts by extending the vicinity of the top of the ridge outward. May go. Note that the warp and the weft of the holding base material are
The rigidity in the 45 ° direction to be applied is determined by the 45 ° direction during molding.
Mold cavity by closing the divided molds located in different directions
The rigidity is increased or decreased by increasing or decreasing the area of the portion where the thickness is reduced.

In the case of increasing the rigidity by means of impregnation with a phenol resin or the like , the woven fabric in which the warp and the weft are orthogonal to each other is used.
After predried impregnated with a phenol resin, a portion other than the fan-shaped as shown in FIG. 2, performs masking a portion other than the strip portions, such as by paper or board in the case of FIG. 4, this phenol resin Is spray-impregnated, and is heated and pressed by a normal molding die to improve the rigidity of the portion in the direction of 45 ° with respect to the warp and the weft. In addition, spray impregnation of the holding substrate with phenolic resin, etc.
The rigidity is increased or decreased by increasing or decreasing the concentration of the phenol resin or the like to be used and the area to be sprayed.

[0018]

According to the present invention, a speaker center holding member and a speaker according to the present invention are provided.
The manufacturing method of the center holding member for
When forming the edge, use a woven fabric where the warp and weft are orthogonal.
Used for the warp and weft yarns which are disadvantages of this woven fabric.
Improved rigidity in the ° direction and improved rigidity
By making the whole rigid uniform in the circumferential direction,
Small speed amplitude limiting capable f ₀ reduction rate of the speaker
To obtain a speaker center holding member for power
is there.

The center holding for the speaker according to the first aspect of the present invention.
Invention of a member and a center holding portion for a speaker according to claims 3 and 4.
The invention of the method of manufacturing the material is based on the mold formed by closing
Radial from the center so that the thickness in the fossa differs between adjacent
Using a molding die partitioned into multiple parts,
The part along the 45 ° direction for the yarn and weft is the mold thickness
Heating and pressurizing the mold so that it becomes the site of the small mold cavity
By molding, the part of the mold with a small cavity
Strongly hits the part along the 45 ° direction for the yarn and weft
Therefore, the crushing of the yarn becomes large and the yarn becomes wide,
As a result, the space between the yarns in this part becomes smaller,
Are strengthened and the rigidity is increased.

The invention of a center holding member for a speaker according to claim 2
And a method for manufacturing a center holding member for a speaker according to claims 5 and 6.
In the invention of the present invention, the warp yarn and the weft yarn are made of
When heating and pressing the complexed woven fabric,
After pre-drying the woven fabric impregnated with
Mark the area other than the 45 ° direction with respect to the yarn and weft.
For masking and masking at 45 °
Phenol resin by impregnating it again with phenol resin, etc.
Has rigidity as a whole by impregnation with
Phenol resin in 45 ° direction relative to weft
Center retainer for loudspeaker with increased rigidity by impregnation
Material can be obtained.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a damper will now be described as an embodiment of the speaker center holding member of the present invention.
The damper 1 shown in FIG. 1 is obtained by impregnating a plain woven fabric material obtained by interlacing warp yarns and weft yarns one by one with a phenol resin, preliminarily drying the material, and then punching it into a circular shape having a required diameter. It is obtained by punching out a mounting hole 2 for mounting a voice coil bobbin in the center, and is obtained in a warp direction (B-
B') and weft direction (A-A') is the direction of 45 ° relative to 1a-1c, the thickness of the other parts of the body 1b-1d in a fan shape surrounded by oblique lines along the portion (2a) (2b ) is obtained by molding and smaller than the thickness <br/> of.

The damper 1 has a warp direction (BB ') and a weft direction (AA) as shown in FIG.
′) At 45 ° (a′-c ′ and b′-d)
') Eight straight lines (a to h) extending radially from the center O
The mold cavities of the pair of molds 10 are divided into eight large and small fan-shaped mold cavities , and the molds adjacent to each other
By closing alignment type fossa parts position (10a and 10b) 45
The thickness of the mold cavity of the mold 10a located in the
Use a mold set smaller than the thickness of the mold cavity of 0b,
The plain woven fabric material is impregnated with a phenol resin and pre-dried, and then the plain woven fabric material is molded using the mold 10 while heating and pressing, and the obtained damper base material is punched into a circular shape having a predetermined diameter. At the same time, a mounting hole 2 for mounting a voice coil bobbin is punched out at the center thereof.
FIG. 3 shows the thickness of the mold cavity in the circumferential direction from point A to point B in FIG. 2, and the mold cavity in the vicinity of d ′ located at 45 ° to the warp and weft yarns. the thickness of the (1
0c) is the thickness of the mold cavity at points A and B (10d)
As a result, the obtained damper has substantially uniform rigidity over the entire circumference.

The damper 11 shown in FIG.
-B ') and eight straight lines radially extending from the center O in a direction of 45 ° with respect to the weft direction (AA') to divide the mold into eight strip-shaped and fan-shaped molds, and to form a strip-shaped metal. Mold cavity
Thickness smaller than the thickness of the fan-shaped die mold fossa the mold which was obtained by heating and pressing molding using (not shown), the strip portion of the damper 11 obtained (12a) And the fan-shaped portion (12b) have substantially the same rigidity.

Next, when the phenolic resin at a site along the direction of 45 ° to the warp and weft by spray impregnated increase stiffness, first the full <br/> phenol resin fabric material made of plain weave After being impregnated and pre-dried, portions other than the 45 ° direction with respect to the warp and the weft, for example, the portion shown by 10b in FIG.
Exposing only the portion represented by a, spraying the same with a phenol resin and impregnating the portion again, pre-drying again, and after completion of the pre-drying, heating using a normal molding die. The cloth material is molded while being pressed, and corrugation is applied to the cloth material to form a damper or an edge.

At this time, the impregnation of the phenolic resin by spraying into the area indicated by 10a can be imparted with a desired rigidity by changing the concentration of the phenolic resin used or by increasing or decreasing the amount to be impregnated. . The rigidity in the 45 ° direction may be imparted to the warp and the weft in a belt shape as shown in FIG.
There is no limitation on its shape.

The damper or edge thus obtained is strengthened in the 45 ° direction with respect to the warp and weft, and has increased rigidity. Therefore, even if a load acts in the DE direction as shown in FIG. stretch is suppressed to, it is possible to reduce the f ₀ reduction of the speaker due to amplitude limitation and circumferential stretching of the speaker. In other words, the mold
The portion of the mold having a small thickness of the fovea strongly contacts the woven fabric, so that the crushing of the thread becomes large and the thread becomes wide. As a result, even when the same woven cloth is used as compared with FIG. 9, the distance between the yarns is reduced, the rigidity of this portion is increased, and the shape of the change in the gap during operation as a speaker is the same as that of the conventional one. It is considerably smaller than that. This means that the degree of fatigue of the woven fabric during operation as a speaker decreases in the direction of 45 ° with respect to the warp and the weft, and the f ₀ reduction rate of the speaker becomes smaller than before.

This is clear from FIG.
That is, FIG. 8 is a characteristic diagram showing a comparison of those obtained by the manufacturing method using the divided molds of conventional and the present invention by the mold of the same shape of the f ₀ the rate of change of the speaker, the present invention The effect of the damper or edge tends to increase as the corrugation wave depth increases,
F ₀ the rate of change of speaker is that of the present invention to the conventional product is approximately 1/2.

[0028]

According to the first and second aspects of the present invention, the speaker is used.
7. A center holding member and a center holding member for a speaker according to claims 3 to 6.
Is basically to form a damper or an edge.
When weaving, use a woven fabric in which the warp and weft are orthogonal.
In the 45 ° direction to warp and weft, which are the drawbacks of fabric
Improved low rigidity to high rigidity,
Is uniformly rigid in the circumferential direction, and the speaker amplitude is
Spin for small speakers restrictions capable f ₀ drop rate
This is a center holding member for a car.

The center holding for the speaker according to the first aspect of the present invention.
Invention of a member and a center holding portion for a speaker according to claims 3 and 4.
The invention of the manufacturing method of the material is used for forming the damper or the edge.
When holding the holding substrate, where the warp and weft cross at right angles,
Therefore, the thickness inside the mold cavity will be different
And a molding die divided into a plurality of parts radially from the center
In the direction of 45 ° to the warp and weft of the woven fabric
Along the part of the mold cavity where the mold thickness is small
Then, it is molded by heating and pressing of a mold,
° to increase the rigidity in the direction to ensure uniform rigidity in the entire circumferential direction.
And a center holding member for a speaker.

The invention of the center holding member for a speaker according to claim 2
And a method for manufacturing a center holding member for a speaker according to claims 5 and 6.
In the invention of the present invention, the warp yarn and the weft yarn are made of
When heating and pressing the complexed woven fabric,
After pre-drying the woven fabric impregnated with
Mark the area other than the 45 ° direction with respect to the yarn and weft.
For masking and masking at 45 °
Phenol resin by impregnating it again with phenol resin, etc.
Has rigidity as a whole by impregnation with
Phenol resin in 45 ° direction relative to weft
Etc. are impregnated to increase the rigidity and make the whole
As a center holding member for a speaker. Thus, the center holding member with good balance over the entire circumference can be easily and easily manufactured using a woven fabric in which warp and weft yarns are inexpensive and easily available.

[Brief description of the drawings]

FIG. 1 is a plan view of a damper as an example of a speaker center holding member of the present invention.

FIG. 2 is an explanatory view of a mold for molding the damper shown in FIG.

FIG. 3 is a sectional view showing a main part of the mold shown in FIG. 2;

FIG. 4 is a plan view showing another embodiment of a damper as an example of the speaker center holding member of the present invention.

FIG. 5 is an explanatory view showing an example of a mold used for the method of manufacturing the speaker center holding member of the present invention.

FIG. 6 is an explanatory view showing another example of a mold used for the method of manufacturing the speaker center holding member of the present invention.

FIG. 7 is an enlarged plan view showing a main part of a damper obtained by a method of manufacturing a speaker center holding member according to the present invention.

FIG. 8 is a characteristic diagram showing the f ₀ change rate of the speaker.

FIG. 9 is an enlarged plan view of a main part of a conventional damper using a woven fabric in which warp and weft are orthogonal to each other.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Damper 2 Mounting hole 10 Die

Claims (6)

(57) [Claims] 1. A disk-shaped holding base material in which a mounting hole for mounting a voice coil bobbin or a mounting hole for connecting to an outer peripheral edge of a damper is formed in a central portion by a woven fabric in which a warp and a weft are orthogonal to each other. In the mold cavity formed
The thickness of multiple
The holding base is provided in the mold cavity of the pair of molds divided into parts.
The material along the 45 ° direction to its warp and weft
Mold so that it is located in the mold cavity with a small mold thickness
Placed in the fossae, and heated and pressed by the mold,
Increase the rigidity of the part along the 45 ° direction for the yarn and weft
A center holding member for a loudspeaker, which is provided with substantially uniform rigidity in the entire circumferential direction . 2. A warp yarn and a weft yarn are formed at right angles by a woven cloth.
Mounting hole for attaching the voice coil bobbin to the
Disc-shaped storage hole with a mounting hole
In the holding base material, the entire holding base material is made of phenol resin or the like.
And pre-dried, then the warp and weft of the holding substrate
Phenol again only in the area along the 45 ° direction to the yarn
45 with respect to the warp and the weft of the holding base material by impregnating with resin or the like.
Increased rigidity in the ° direction to provide almost uniform rigidity in the entire circumferential direction
Center holding portion for a speaker characterized by providing
Wood. 3. A damper or edge is formed of a woven fabric in which a warp and a weft are orthogonal to each other, and the woven fabric is impregnated with a phenol resin or the like, and then heated and pressed to form a damper or an edge. By closing
The thickness of the mold cavity formed should be different from the center
Using a pair of molds radially divided into multiple parts,
Hold the holding substrate along the 45 ° direction with respect to its warp and weft.
Mold so that the part
It is placed in the mold cavity and maintained by heating and pressing the mold.
Part of the base material along the 45 ° direction with respect to the warp and weft
To increase the rigidity of the whole to give a substantially uniform rigidity in the circumferential direction.
Of a center holding member for a speaker, characterized in that
Construction method. 4. Giving the rigidity of the holding base material to the warp yarns and the weft yarns in the 45 ° direction increases or decreases the area of the mold cavity with a small thickness located in the 45 ° direction at the time of molding. 4. The method for manufacturing a speaker center holding member according to claim 3 , wherein the rigidity is increased or decreased by causing the rigidity to increase or decrease. 5. A warp of a holding substrate obtained by forming a holding substrate constituting a damper or an edge by a woven fabric in which a warp and a weft are orthogonal to each other , impregnating the woven fabric with a phenolic resin and the like, and then pre-drying the woven fabric. A speaker center characterized by masking portions other than the 45 ° direction portion with respect to the weft yarn, spraying and impregnating the phenol resin or the like again with only the 45 ° direction portions that are not masked, and heating and pressing with a mold to mold. Manufacturing method of the holding member. 6. The loudspeaker according to claim 5, wherein the impregnation of the holding base material with the phenol resin or the like by spraying is performed by increasing or decreasing the rigidity by increasing or decreasing the concentration of the phenol resin or the like to be used and the area to be sprayed. Manufacturing method of center holding member.