JPH09154199A - Center support member for speaker and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To limit magnitude of vibration of a speaker and to decrease a f0 reduction rate by uniformizing the stiffness of the entire circumference in the case of making a damper or an edge with a woven cloth having a directivity in the weaving. SOLUTION: In the case of a mount hole 2 for a voice coil bobbin in the center of a woven cloth where warps and wefts are orthogonal to each other, the stiffness of parts 2a along a direction of 45 deg. from the center of the mount hole 2 to the warps and wefts is enhanced by using a metallic die which produces a pattern that is parted into plural radial positions with different clearance among adjacent positions, or impregnating a thermoplastic resin again only to positions along the direction of 45 deg. as above. Thus, the damper 1 is formed whose circumferential stiffness is uniformized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used in various 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 is attached to a frame. And a manufacturing method for manufacturing the center holding member for the speaker. More specifically,
The present invention relates to a speaker center holding member in which the rigidity in the circumferential direction is made uniform in a damper or an edge made of a woven cloth having a directionality depending on the weave, and a manufacturing method thereof.

[0002]

2. Description of the Related Art A damper for accurately holding a diaphragm of a speaker in the center of a magnetic circuit, or an edge for holding the diaphragm in a frame by being combined with an outer peripheral edge of the diaphragm is 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 yarns and weft yarns are interlaced one by one, or twill weave in which three or more warp yarns and weft yarns are combined, and has a directional weaving method. Often.

However, in all of these woven fabrics, the warp threads and the weft threads intersect at a substantially right angle, so that although they have rigidity in the longitudinal direction or the transverse direction, they are 45 ° with respect to the warp threads and the weft threads.
The rigidity in the direction of is extremely weak. That is, as shown in FIG. 9, since a woven fabric composed of such warp threads 20 and weft threads 21 has no threads in the DE direction (the direction of 45 ° with respect to the warp threads 20 and the weft threads 21), the formed damper or edge Is extremely weak against bending in the DE direction, and when applied to a speaker, the shape of the gap between the threads greatly changes due to vertical vibration, so that a large change in f ₀ occurs, which is the worst case. In this case, there was a problem such as radial tearing in the 45 ° direction. In the figure, 22 is a gap formed by the warp yarn 20F and the weft yarn 21, and 23 is an impregnated phenol resin.

Therefore, in order to solve such a problem of the center holding member, for example, Japanese Patent Laid-Open No. 63-146.
In Japanese Patent No. 692, a waveform is divided into a plurality of parts by a straight line extending radially from the center of a damper formed in a radial shape, and the height of the waveform is made different from each other next to the divided part to achieve high input resistance, Speakers have been proposed that enable high quality bass reproduction.

[0005]

[Patent Document 1] Japanese Patent Application No. 63-14
In the speaker disclosed in Japanese Patent No. 6692, a damper is divided into six parts by a straight line extending radially, the heights of adjacent waveforms are changed, and an amplitude with less distortion is provided in a deep waveform part and an amplitude limit is provided in a shallow waveform part. In addition, as a total, a motion with less distortion is obtained up to the amplitude limit. However, in this speaker, no consideration is given to the directionality due to the weave of the cloth material,
The rigidity in the direction of 45 ° is small with respect to the warp yarn and the weft yarn, and as a result, the problems described in the section of the prior art have not been solved at all.

In view of the above situation, the present invention is directed to a center holding member such as a damper or an edge for a speaker, which is made of a woven cloth having a directionality depending on a weaving method, in a direction of 45 ° with respect to a warp thread and a weft thread. It is intended to provide a center holding member that effectively imparts rigidity and thereby makes the rigidity uniform over the entire circumference, and a manufacturing method thereof.

[0007]

In order to achieve the above object, the invention according to claim 1 of the present invention is a mounting hole or a damper for mounting a voice coil bobbin in a central portion by a woven fabric in which warp threads and weft threads are orthogonal to each other. In a disc-shaped holding substrate having a mounting hole that is connected to the outer peripheral edge of the warp, the rigidity of the portion along the direction of 45 ° from the center of the mounting hole to the warp and the weft is the rigidity in the warp and weft directions. The center holding member for a speaker is characterized in that substantially uniform rigidity is imparted in the circumferential direction by increasing the center holding member.

According to a fifth aspect of the present invention, the holding base material forming the damper or the edge is formed of a woven cloth in which warp threads and weft threads are orthogonal to each other, and the woven cloth is impregnated with a phenol resin. When molding the damper or edge by heating and pressing, the mold is radially divided into multiple parts, and the mold is made to have different clearances between the divided parts, and the mold is held. A method for manufacturing a center holding member for a speaker, characterized in that a clearance in a direction of 45 ° with respect to a warp and a weft of a base material is made smaller than that in the warp and the weft to enhance rigidity.

Further, in the invention according to claim 6 of the present invention, the holding base material constituting the damper or the edge is formed by a woven cloth in which warp threads and weft threads are orthogonal to each other, and the woven cloth is impregnated with a phenol resin. Preliminary drying is performed. Masking is applied to the warp yarn and the weft yarn of the obtained holding member except for the portion in the 45 ° direction, and only the portion in the 45 ° direction not to be masked is again spray-impregnated with the thermoplastic resin and heated by a mold. It is a method of manufacturing a center holding member for a speaker, which is characterized by pressing and molding.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the center holding member constituting the damper or the edge is made of a woven fabric in which warp threads and weft threads are orthogonal to each other. Examples thereof include a woven fabric material and a twill woven material in which three or more warp yarns and three weft yarns are combined.

Such a holding member has a relatively high rigidity in the longitudinal direction or the transverse direction, but has a rigidity of 45 with respect to the warp thread and the weft thread.
The rigidity in the ° direction is small and there is no strength in the circumferential direction. Therefore, the present invention intends to increase the rigidity in the 45 ° direction with respect to the warp and the weft when the holding member is formed by using the cloth material having the directionality by such a weave,
One means is to divide a mold used for molding a damper or an edge into a plurality of parts radially from the center, and to set a mold at a part along a 45 ° direction with respect to a warp and a weft to a mold clearance of another part. This is a method of increasing the rigidity in the 45 ° direction by heating and pressurizing the holding base material by making it smaller than that.

Another means is to impregnate a cloth material with a thermoplastic resin such as phenol resin and then pre-dry it, and heat and pressurize the cloth material with a mold to form a damper or an edge. On the other hand, it is a method of masking parts other than the part along the 45 ° direction and spray impregnating the thermoplastic resin again only on the part which is not masked along the 45 ° direction to enhance rigidity.

In the case of increasing the rigidity in the 45 ° direction by using the former partitioned mold, basically the circumferential direction (see FIG. 3) is used.
It is desirable to increase or decrease the clearance in the A-1d-B direction), but as shown in FIG. 2, the angle X is set along the direction of 45 ° with respect to the warp yarn and the weft yarn, and this angle X is set to 30-80. The clearance of the fan-shaped portion may be reduced to a constant value by changing the clearance between 0 °. Further, as shown in FIG. 4, the clearance of the belt-like portion having a predetermined width may be made constant along the direction of 45 ° with respect to the warp yarn and the weft yarn.

The rigidity of the warp and the weft in the direction of 45 ° is imparted to the warp and the weft by such a mold by dividing the mold radially into a plurality of molds, and if the clearances of the divided molds are different from each other. Specifically, as shown in FIG. 5, the clearance g between the dies (upper die 10 and lower die 10) between points O ′ and O in FIG.
6 may be made constant, and as shown in FIG. 6, the vicinity of the top of the ridge portion for imparting corrugation of corrugation to the holding substrate in the circumferential direction is projected to the outside and the upper mold 10
Alternatively, the clearance g ′ between the lower mold 10 and the lower mold 10 may be set to be smaller than the clearance g of the other part. In addition, the warp and the weft of the holding substrate are 4
The rigidity is given in the 5 ° direction by increasing / decreasing the rigidity by increasing / decreasing the area of a portion of the partitioned mold located in the 45 ° direction that reduces the clearance during molding.

To increase the rigidity by means of the latter method of impregnating with a thermoplastic resin, a woven fabric in which warp and weft are orthogonal to each other is impregnated with the thermoplastic resin and pre-dried, and then a shape other than the fan shape shown in FIG. 2 is used. In the case of FIG. 4, the parts other than the strip-shaped part are masked with paper or a plate, and the thermoplastic resin is spray-impregnated into the parts, and the warp yarns and the weft yarns are formed by heating and pressurizing with a usual molding die. The rigidity of the part in the direction of 45 ° is improved. In the spray impregnation of the holding base material with the thermoplastic resin, the rigidity is increased / decreased by changing the concentration of the thermoplastic resin used and the area to be sprayed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the speaker center holding member of the present invention applied to a damper will be described below.
The damper 1 shown in FIG. 1 is obtained by impregnating a phenolic resin with a plain-woven cloth material obtained by interlacing warp threads and weft threads one by one, preliminarily drying it, and then punching it into a circular shape having a required diameter. It was obtained by punching out the mounting hole 2 for mounting the voice coil bobbin in the center part, and
B ') and the fan-shaped portion (2a) surrounded by diagonal lines along 1a-1c, 1b-1d, which is a direction of 45 ° with respect to the weft thread direction (AA'), the clearance of the other portion (2).
It is molded with a clearance smaller than that of b).

This damper 1 is, for example, as shown in FIG. 2, a warp direction (BB ') and a weft direction (AA).
Direction of 45 ° (a′-c ′ and b′-d)
′) Eight straight lines (a to h) extending radially from the center O
The mold 10 is divided into eight parts having a large fan shape and a small fan shape by the molds 10 (10a and 10a)
Mold 10a with a clearance of b) located at 45 °
Using a mold whose clearance is set to be smaller than that of another mold 10b, impregnating a plain woven cloth material with a phenol resin and predrying the same, and then using the mold 10 to form a plain woven cloth material. The damper base material obtained by molding while heating and pressing is punched into a circular shape having a predetermined diameter, and at the same time, a mounting hole 2 for mounting a voice coil bobbin is punched out. FIG. 3 shows the clearance of the mold in the circumferential direction from the point A to the point B in FIG. 2, and the clearance (10c) in the vicinity of d ′ located at 45 ° to the warp and weft is Since the clearance is smaller than the clearance (10d) at the points A and B, the obtained damper has a substantially uniform rigidity over the entire circumference.

The damper 11 shown in FIG. 4 has a warp direction (B
-B ') and the weft direction (AA') with respect to the direction of 45 °, the metal mold is divided into eight strip-shaped and fan-shaped by eight straight lines extending radially from the center O. It is obtained by heat and pressure molding using a die (not shown) having a die clearance smaller than that of a fan-shaped die. The obtained belt-shaped portion (12a) of the damper 11 and the fan are obtained. The shaped portion (12b) has substantially the same rigidity.

Next, when the thermoplastic resin is spray-impregnated into a portion along the direction of 45 ° with respect to the warp and the weft to increase the rigidity, first, a cloth material made of plain weave or the like is impregnated with the phenol resin to prepare a preliminary. After drying, a portion other than the portion in the 45 ° direction with respect to the warp yarn and the weft yarn, for example, the portion indicated by 10b in FIG.
Only the part indicated by is exposed, and this part is also sprayed with a phenolic resin to impregnate it and then pre-dried again.After completion of this pre-drying, heat and pressure are applied using a normal molding die. Meanwhile, it is molded to give corrugation to the cloth material to form a damper or an edge.

At this time, the impregnation of the portion 10a with the phenol resin by spraying can impart a desired rigidity by changing the concentration of the phenol resin used or by increasing or decreasing the impregnated amount. . Further, the imparting of rigidity to the warp yarn and the weft yarn in the direction of 45 ° may be a band-like shape as shown in FIG.
There is no limit to its shape.

In the damper or edge thus obtained, the portion in the 45 ° direction with respect to the warp yarn and the weft yarn is reinforced and the rigidity is increased. Therefore, as shown in FIG. The expansion and contraction of the speaker can be suppressed, and the decrease in the speaker's f ₀ due to the speaker amplitude limitation and the expansion and contraction in the circumferential direction can be reduced. That is, since the die having a small clearance is strongly hit by the heating and pressurizing, the crushing of the yarn becomes large and the yarn becomes wide. As a result, compared to FIG. 9, even if the same woven fabric is used, the distance between the threads is reduced, the rigidity of this portion is increased, and the shape of the change in the gap during the operation as the speaker becomes the conventional shape. It is considerably smaller than that. This means that the degree of fatigue of the woven cloth during operation as a speaker becomes smaller in the direction of 45 ° with respect to the warp and weft, and the reduction rate of f _{0 of} the speaker becomes smaller than in the conventional case.

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

[0023]

The speaker center holding member of the present invention is
When a damper or an edge is formed, a woven fabric in which warp yarns and weft yarns are orthogonal to each other is used. The parts in the 45 ° direction are heated and pressed by using molding dies with different clearances between adjacent ones, or heat is applied to the required parts in the 45 ° direction with respect to the warp and weft. Since the rigidity of the portion is increased by re-impregnating with the plastic resin, the rigidity of the center holding member is uniform over the entire circumference, and it is possible to obtain a speaker with a small f ₀ reduction rate in which the amplitude of the speaker can be limited.

Further, according to one method of manufacturing a speaker center holding member of the present invention, a molding die for manufacturing a damper or an edge is divided into a plurality of parts by a line extending in a radial direction from the center and impregnated with a thermoplastic resin. When heating and pressing a woven fabric in which the warp threads and the weft threads intersect at right angles to each other, the clearance between the divided dies in which the portion in the 45 ° direction with respect to the warp threads and the weft threads is located is larger than the clearance between the adjacent dies. Since it is performed using a molding die that is also small, it is possible to easily and easily manufacture a center holding member that is well-balanced over the entire circumference by using a woven fabric in which warp yarns and weft yarns are orthogonal to each other, which is inexpensive and easily available. It is a thing.

Further, according to another method of manufacturing a center holding member for a speaker of the present invention, when a woven fabric in which warp yarns and weft yarns impregnated with a thermoplastic resin intersect at right angles is formed by heating and pressing, the thermoplastic resin is temporarily After pre-drying the woven fabric impregnated with, the parts other than the part in the 45 ° direction with respect to the warp and weft are masked, and the unmasked part in the 45 ° direction is again impregnated with the thermoplastic resin. However, it is possible to easily and easily manufacture a center holding member that is well-balanced over the entire circumference by using an inexpensive and easily available woven fabric in which warp yarns and weft yarns intersect at right angles.

[Brief description of the drawings]

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

2 is an explanatory view of a mold for molding the damper shown in FIG. 1. FIG.

FIG. 3 is a cross-sectional view showing a main part of the mold shown in FIG.

FIG. 4 is a plan view showing another embodiment of the damper which is 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 in the method of manufacturing the speaker center holding member of the present invention.

FIG. 6 is an explanatory view showing another example of the mold used in the method for 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 the method of manufacturing the speaker center holding member of 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 damper using a conventional woven fabric in which warp threads and weft threads are orthogonal to each other.

[Explanation of symbols]

 1 Damper 2 Mounting hole 10 Mold

Claims (7)

[Claims] 1. A disc-shaped holding base material having a mounting hole for mounting a voice coil bobbin or a mounting hole for coupling with an outer peripheral edge of a damper formed in a central portion by a woven fabric in which warp threads and weft threads are orthogonal to each other. A speaker having a substantially uniform rigidity in the circumferential direction provided by increasing the rigidity of a portion along the direction of 45 ° with respect to the warp and the weft from the central part of the warp to be higher than the rigidity in the warp and the weft directions. Center holding member. 2. The rigidity of a portion of the holding base material along the 45 ° direction with respect to the warp yarn and the weft yarn is divided into a plurality of portions radially of a die for heating and pressing, and the division is performed. It is obtained by using a mold in which the clearances of adjacent molds are made different from each other and the clearance in the direction of 45 ° with respect to the warp yarn and the weft yarn of the holding base material is made small to enhance the rigidity. Claim 1 characterized by the above.
The speaker center holding member described. 3. To impart rigidity to a portion of the holding base material along the 45 ° direction with respect to the warp yarn and the weft yarn, after impregnating the holding base material with a thermoplastic resin and preliminarily drying, A thermoplastic resin is impregnated only in a portion along the 45 ° direction with respect to the weft yarn to enhance the rigidity of the woven fabric in the 45 ° direction with respect to the warp yarn and the weft yarn. Item 1. A center holding member for a speaker according to Item 1. 4. A holding base material constituting a damper or an edge is formed by a woven cloth in which warp threads and weft threads are orthogonal to each other, and when this woven cloth is impregnated with a phenol resin, it is heated and pressed to form a damper or an edge, Using a mold that divides the mold radially into multiple parts, and makes the clearance of the divided part different from each other next to each other,
A manufacturing method of a center holding member for a speaker, characterized in that a clearance in a direction of 45 ° with respect to a warp and a weft of a holding substrate is made smaller than that of the warp and the weft to enhance rigidity. 5. The impartation of rigidity in the 45 ° direction to the warp yarn and the weft yarn of the holding base material increases or decreases the area of a portion that reduces the clearance of the partitioned mold located in the 45 ° direction during molding. The method for manufacturing a speaker center holding member according to claim 4, wherein the rigidity is increased or decreased by performing the above. 6. A holding base material constituting a damper or an edge is formed by a woven cloth in which warp threads and weft threads are orthogonal to each other, and the woven cloth is impregnated with a phenol resin and then preliminarily dried. For a speaker characterized by masking a portion other than the 45 ° direction portion with respect to the weft yarn, spray impregnating the thermoplastic resin again only on the 45 ° direction non-masking portion, and heating and pressing with a mold Manufacturing method of center holding member. 7. The speaker according to claim 6, wherein the holding base material is impregnated with the thermoplastic resin by spraying to increase or decrease the rigidity by increasing or decreasing the concentration of the thermoplastic resin used and the area to be sprayed. Manufacturing method of center holding member.