JP2671140B2 - Speaker damper and its manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a damper for a speaker provided with a conductive member for inputting a voice signal to a voice coil, and a method for manufacturing the same.

[Prior Art] Conventionally, in order to simplify the wiring structure to the voice coil, as shown in FIGS. 9 to 12, a damper material made of a cloth material such as a woven cloth or a non-woven cloth is heated with a phenol resin or the like. A damper main body 21 integrally formed with a corrugated corrugation 22 by thermoforming while impregnating a curable resin,
There has been proposed a speaker damper including two conductive members 23 mounted along the shape of the corrugation 22 from the inner peripheral portion 21a to the outer peripheral portion 21b.

As shown in FIG. 14 (A), as a manufacturing method and a manufacturing die thereof, a conductive material 23 is attached to a damper material 20 made of the above cloth material such as woven cloth or non-woven cloth with an adhesive S.
After adhering with, the thermosetting resin 24 is impregnated by passing through the treatment tank 30 containing the thermosetting resin 24 such as phenol resin diluted with a solvent, and the solvent is volatilized to make the resin tacky. Method of thermoforming with a molding die with the above removed, as shown in FIG. 14 (B), the damper material 20 made of the cloth material is impregnated with the thermosetting resin 24 diluted with a solvent, and A method in which the conductive member 23 is adhered in a state where the resin tackiness is removed by volatilizing the solvent, and then thermoforming is performed. A damper material 20 made of a cloth material as in FIG. 14 (B).
Is impregnated with a thermosetting resin 24 diluted with a solvent, and the damper main body 21 as shown in FIG. 14 (C) is obtained by subjecting the solvent to volatilization and thermoforming with the resin tackiness removed. There is a method of bonding a conductive member 23 made of copper foil or tinsel wire to the front surface or the back surface of the corrugation 22.

FIGS. 15A to 15D are sectional views of a mold for molding the damper as described above, FIGS. 15A and 15B are sectional views showing a molding process of the damper main body 21, and FIG. ), (D) are cross-sectional views showing a mounting process of the conductive member 23. Also, the thirteenth
The figure is a cross-sectional view of the speaker damper configured as described above, and the width W and depth D of the corrugation 22 are formed in the same shape from the inner peripheral portion 21a to the outer peripheral portion 21b.

As shown in FIGS. 15 (A) and 15 (B), the damper material 20 described above has a large number of uneven portions corresponding to the corrugations 22.
The upper and lower molds 31 and 32 formed in an annular shape with 33 and 34 are heat press molded, but as is well known, the material, that is, the damper material 20 is drawn from the outer peripheral portion 20a to the inner peripheral portion 20b side during molding. Molded. Therefore, the shape and number of corrugations 22, especially width W and depth D, are
It is set within a range that does not cause warpage or deformation after molding.

As a means for mounting the conductive member 23 on the damper body 21,
In the above method, as shown in FIGS. 15 (A) and 15 (B), the damper material 20 is press-molded by the heated dies 31, 32 to obtain the damper main body 21, and FIG. ) And (D), the conductive member 23 is formed into the shape of the corrugation 22 and bonded together. Further, in the above methods and, the damper material 20 is press-molded by the heated molds 31 and 32 with the conductive member 23 attached.

[Problems to be Solved by the Invention] In the above-described speaker dampers that have been conventionally proposed, since the conductive member 23 is attached to the damper main body 21 by bonding, a large amplitude continues for a long time. And the conductive member 23 peels from the corrugation 22, the peeling portion makes a noise by hitting the back surface of the damper or the cone diaphragm, or the conductive member 23 is peeled and abnormal without maintaining an appropriate shape. There is a drawback that the wire breaks when the resonance continues, and we also conducted various experiments, but we found that it was unsuitable for actual commercialization.

In addition, the conventional method for manufacturing the speaker damper described above has the following drawbacks in mass productivity.

In the technique of impregnating the thermosetting resin after mounting the conductive member 23 on the damper material 20 as described above, the thermosetting resin 24
Is thermoformed while attached to the conductive member 23.
The thermosetting resin 24 adhered to 23 is hardened, and this becomes an insulating material unsuitable for connecting lead wires, and the hardened thermosetting resin 24 must be removed when connecting lead wires. Increases, and if the work such as masking the conductive member 23 or removing the thermosetting resin 24 attached to the conductive member 23 while the conductive member 23 is not cured causes an increase in man-hours as described above. As a result, the cost increases.

Further, the material examination of the adhesive S to be used and the method of applying the adhesive become complicated. For example, it takes time until a predetermined adhesive strength is obtained with a general rubber adhesive, and a reaction type such as an acrylic adhesive is used. So too hard, corrugation
22 cannot be molded, and the selection range of the adhesive S is significantly limited.

As described above, when the damper material 20 is impregnated with a thermosetting resin, the solvent is volatilized, and the conductive member 23 is adhered in a state where the resin tack property is removed, the thermosetting resin 24 as described above is used as the conductive member 23. Although there is no defect due to the adhesion to the adhesive, there are drawbacks such as examination of the material of the adhesive S and complexity of the adhesive application method as in the case of using the adhesive S.

Although the conductive member 23 is adhered after the damper body is molded as described above, the above-mentioned drawbacks do not exist, but the conductive member 23 needs to be adhered along the corrugation 22, and the adhesive is evenly applied along the corrugation 22. There is a drawback in that the method of doing it becomes complicated.

When the conductive member 23 is mounted along the corrugation 22, the width W and the depth D of the corrugation 22 are formed in the same shape in the conventional speaker damper from the inner peripheral portion 21a to the outer peripheral portion 21b. Therefore, it has the following drawbacks.

That is, since the deformation rate of a copper foil, a tinsel wire, or the like generally used as the conductive member 23 is lower than that of a cloth material such as a woven fabric or a non-woven fabric, the conductive member 23 has a defect that cracks occur during molding. ing. In particular, cracks are likely to occur in the vicinity of the first concave portion 331 and the first convex portion 341 on the inner peripheral side where a large amount of force for drawing the material of the conductive member 23 acts. The reason is that the outer peripheral portion 23b side of the conductive member 23 is cut and becomes a free end, and the material is easily moved, but the inner peripheral portion 23a side is connected with the material, which is a so-called solid state. This is because it is extremely difficult to move the material. Therefore, the force of drawing the material is increased toward the inner peripheral portion 23a side,
Many cracks occur in this part.

In order to avoid such a state, the material of the conductive member 23,
As shown in FIG. 15 (C), the inner peripheral portion 2 is divided into two parts at the intermediate portion 23c.
A method of freeing both the 3a side and the outer peripheral portion 23b side and a method of arranging a conductive member to the extent that cracks do not occur are also conceivable, but the former requires an extremely large number of steps, and the latter requires a conductive member 23 after molding. However, there is a drawback that internal stress remains and it is easily deformed.

As described above, the conductive part mounting type damper in which the conductive material is mounted on the damper has been conventionally proposed in various forms, but in reality, it cannot be implemented in any of the forms and is not commercialized at present. Is.

As a result of repeated experiments and studies to realize a conductive part-mounted damper, we have braided a tinsel wire, which has an excellent track record as a conductive material, into a flat braided tinsel wire, which is woven or non-woven. It has been found that the intended purpose can be achieved by sewing a damper material made of, for example, etc. with fibers and then molding it into a predetermined damper shape.

Therefore, a first object of the present invention is to solve the above-mentioned drawbacks of the conventional speaker damper and to provide a speaker damper in which a conductive member is securely attached along the corrugation of the damper body.

A second object of the present invention is to provide a manufacturing method capable of mass-producing the above speaker damper, reducing the cost, and obtaining a uniform product.

[Means for Solving the Problems] A first speaker damper according to the present invention is obtained by impregnating a damper material made of a cloth material such as a woven cloth or a non-woven cloth with a phenol resin or other thermosetting resin and performing thermoforming. In a damper for a speaker, which comprises a damper main body integrally formed with a plurality of concentric corrugations and a conductive member mounted along the shape of the corrugation in the direction from the inner peripheral portion to the outer peripheral portion, a conductive wire made of a flat wire tinsel wire is used. The member is sewn to the damper body with fibers.

Further, the second speaker damper is such that the width of the corrugations is gradually increased from the corrugation on the outer peripheral side to the corrugation on the inner peripheral side.

As a method for manufacturing a speaker damper according to the present invention, after a thermosetting resin is impregnated into a damper material made of the above-mentioned cloth material, a conductive member made of a flat screen tinsel wire is sewn with a fiber, In this state, a thermoforming process is performed by a die device, and then a punching process is performed into a predetermined damper shape.

[Function] A damper material made of a cloth material such as woven cloth or non-woven cloth is impregnated with a phenol resin or other thermosetting resin diluted with a solvent, and the solvent is volatilized to remove the resin tackiness. A predetermined corrugation is formed by thermoforming a conductive member made of a knitted tinsel wire sewn with fibers with a molding die. This is punched into a predetermined shape to obtain a speaker damper.

In the speaker damper in which the conductive member made of the flat braided tinsel wire is sewn with the fibers as described above, there is no risk of peeling of the conductive member or disconnection accompanying peeling.

When the conductive member is attached, a flat mesh tinsel wire is used as the conductive member, and the conductive member has a width, so that the conductive member is easily sewn.

Furthermore, when a normal copper foil is sewn, it will be cut by pressing after sewn, but since the flat mesh tinsel wire has ductility, it can be pressed without cutting.

In order to form the corrugation, a plurality of annular uneven portions provided on the upper and lower molds have different widths on the inner peripheral side and the outer peripheral side, that is, the width of the uneven portions on the inner peripheral side. A mold device is used in which the width is larger than the width of the uneven portion on the outer peripheral side. Then, the damper material and the conductive member are sewn together and then heat-molded by this mold device.

In this case, even if more drawing force is applied to the inner peripheral side of the conductive member, since the width of the uneven portion is larger than that of the outer peripheral side, cracks may not occur on the inner peripheral side of the conductive member. Absent.

[Embodiment] An embodiment of a speaker damper and a manufacturing method thereof according to the present invention will be described with reference to FIGS. 1 to 8.

FIG. 1 is a plan view of a speaker damper, FIG. 2 is a plan view showing an example in which a conductive member is sewn with fibers, and FIG.
FIG. 4 is an enlarged sectional view taken along the line AA in FIG. 4, FIG. 4 is a sectional view taken along the line BB in FIG. 1, and FIG. 5 is an enlarged sectional view taken along the line C in FIG.
FIG. 7 is a manufacturing process diagram, FIGS. 7A and 7B are cross-sectional views showing a molding process in a mold device, and FIG. 8 is a cross-sectional view showing a speaker damper molded in the molding process of FIG. Is.

In the figure, 1 is a damper body, 2 is a corrugated corrugation formed concentrically on the damper body 1, and 3 is a conductive member mounted along the shape of the corrugation 2 from the inner peripheral portion 1a to the outer peripheral portion 1b. Shows. In addition,
1c is a bonding margin formed on the outside of the corrugation 2.

The damper body 1 includes a damper material 10 made of a cloth material such as a woven cloth or a non-woven cloth, and the inside of a treatment tank 6 in which a thermosetting resin 5 such as a phenol resin diluted with a solvent is stored as shown in FIG. The thermosetting resin 5 is impregnated by passing it through, and the solvent is volatilized to remove the resin tack property, and the damper material 10 in this state is attached to the conductive member 3
Are sewn with the fiber (thread) 4. This is molded by a thermoforming die to integrally form a concentric corrugation 2 having a corrugated shape.

As the conductive member 3, a flat braided tinsel wire braided into a flat braided braided tinsel wire, which has a proven track record in the conductive member of a speaker that requires flexibility and vibration resistance, is used. The sewing process of the conductive member 3 can be easily attached with the industrial sewing machine 7. In this case, since the conductive member 3 is a flat mesh tinsel wire braided with a tinsel wire, the conductive member 3 has a width. , Very easy to sew.

After the conductive member 3 is attached in this way, the corrugation 2 is integrally molded on the damper body 1 by heat press molding using a mold device, and the conductive member 3 is mounted in a state along the shape of the corrugation 2. It

Then, as shown in FIGS. 7 (A) and 7 (B), the width between the plurality of annular concave portions 13 and convex portions 14 provided in the upper and lower molds 11 and 12 for molding the corrugation 2 is set to be equal to A mold device 8 is used in which the peripheral portion side and the outer peripheral portion side are made different, that is, the width between the concave portion 13 and the convex portion 14 on the inner peripheral portion side is sequentially increased from that on the outer peripheral portion side. To be done.

In this case, even if a larger drawing force than the inner peripheral side of the conductive member is applied, the width of the uneven portion is larger than that of the outer peripheral side, and thus the amount of material drawn in on the inner peripheral side is small. No cracks occur on the inner peripheral side.

The speaker damper molded as described above is shown in FIG. 8, and the width W of the corrugation on the inner peripheral side is shown.
Is gradually widened toward the corrugation of the outer peripheral portion, and the conductive member 3 is attached along the corrugation.

In the above example, only the width W of the corrugation 2 is changed, but the depth D of the corrugation 2 can be gradually reduced from the corrugation on the outer peripheral side to the corrugation on the inner peripheral side. Both the width W and the depth D can be made gradually wider and shallower from the corrugation on the outer peripheral side to the corrugation on the inner peripheral side.

[Effect of the Invention] According to the speaker damper of the present invention, the flat mesh tinsel wire formed by braiding the tinsel wire into a flat mesh is used as a conductive member, and this is sewn with fibers in a form along the corrugation shape of the damper body. Therefore, unlike the conventional type in which a conductive member is adhered, an adhesive layer is not formed, so flexibility is maintained, and it is possible to mount extremely firmly compared to the conventional type, and a large amplitude is achieved. The conductive member does not peel off from the corrugated portion even if it is continued for a long time.

As described above, since the flat knitted tinsel wire braided in a flat net shape by braiding the tinsel wire, which has a proven track record as a conductive member of a speaker that requires bending resistance and vibration resistance, is used as the conductive member, Therefore, the sewing work to the damper material is easy, and the flexibility described above can be exhibited more, and the limit performance of the amplitude can be extremely increased. Therefore, it is possible to significantly improve the performance as compared with the conventional example, and the range of the speaker in which the damper with the conductive portion can be used is expanded.

Further, according to the speaker damper in which the width of the corrugation on the inner peripheral side is wider than the width of the corrugation on the outer peripheral side, the material deformation rate on the inner peripheral side of the damper body is smaller than that of the conventional example. Even if it is mounted along the corrugation shape, no cracks are generated in the conductive member near the corrugation on the inner peripheral side, and the productivity is good.

On the other hand, the amount of the material of the damper material drawn from the outer peripheral side to the inner peripheral side at the time of molding is significantly smaller than that of the conventional example, so that the residual internal stress of the damper after molding is reduced and deformation, especially It is possible to effectively prevent warpage and improve the quality and productivity.

In the method for manufacturing the speaker damper of the present invention, the damper material in the state where the resin tackiness is removed is sewn with the conductive member made of the flat mesh tinsel wire with the fiber, and then the molded product is heated and formed. Therefore, the insulating resin does not adhere to the conductive member, and there is no need for man-hours such as removing the insulating resin adhered to the conductive member as in the conventional case. You can easily attach it by wearing it.

Therefore, unlike the case of the conventional example, it is not necessary to study the material of the adhesive and a complicated adhesive application method, and the man-hours can be reduced, the transition to the next process is easy, the ease of handing off, and the intermediate process. Cost reduction can be achieved by reducing the number of products. Moreover, since the adhesive is not used, the damper main body does not adhere to the mold during the heat molding, and there is an effect that the demolding work is easy.

[Brief description of the drawings]

1 to 8 show an embodiment of a speaker damper and a manufacturing method thereof according to the present invention. FIG. 1 is a plan view of the speaker damper, and FIG. 2 is an example in which a conductive member is sewn with fibers. The plan view shown in FIG. 3 is an enlarged sectional view taken along line AA in FIG.
The drawing is a cross-sectional view taken along the line BB in FIG. 1, and FIG. 5 is C in FIG.
FIG. 6 is an enlarged sectional view of a portion, FIG. 6 is a manufacturing process diagram, and FIGS. 7A and 7B are sectional views showing a molding process in a mold apparatus.
FIG. 8 is a sectional view showing the speaker damper molded in the molding process of FIG. FIG. 9 to FIG. 15 are views for explaining a conventionally proposed conductive member arrangement type speaker damper, a method of manufacturing the same, and a manufacturing mold, and FIG. 9 is a plan view of the speaker damper. 10 is a sectional view taken along the line AA of FIG. 9, FIG. 11 is a sectional view taken along the line BB of FIG. 9, FIG. 12 is an enlarged sectional view of a portion C of FIG. 11, and FIG. Cross-sectional view of the damper showing that the depth is uniform, FIGS. 14 (A) to (C) are manufacturing process drawings, and FIGS. 15 (A) and 15 (B) are cross-sectional views of the mold showing the damper main body molding process. FIGS. 15 (C) and 15 (D) are sectional views of the mold showing the conductive member mounting step. 1: damper body, 1a: inner peripheral part, 1b: outer peripheral part, 2: corrugation, 3: conductive member 4: fiber, 5: thermosetting resin, 8: mold device, 10: damper material 11, 12: metal Type

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Haga No. 954-1 Shiono, Shinmachi, Mamurogawa-cho, Mogami-gun, Yamagata Prefecture Mogami Denki Co., Ltd. (56) Reference JP-A-61-21899 (JP, A) Actual Kai 61-107298 (JP, U) Actual Sho 58-138495 (JP, U)

Claims (3)

(57) [Claims] 1. A damper main body in which a damper material made of a cloth material such as woven cloth or non-woven cloth is impregnated with a phenol resin or other thermosetting resin, and a plurality of concentric corrugations are integrally formed by thermoforming. A speaker damper comprising a conductive member mounted from the inner peripheral portion toward the outer peripheral portion along the shape of the corrugation, wherein the conductive member is a flat mesh tinsel wire, and the conductive member is sewn to the damper main body with a fiber. The damper for the speaker, which is characterized by 2. The speaker damper according to claim 1, wherein the width of the corrugations is gradually increased from the corrugations on the outer peripheral side to the corrugations on the inner peripheral side. 3. A damper body in which a damper material made of a cloth material such as woven cloth or non-woven cloth is impregnated with a phenol resin or other thermosetting resin, and a plurality of concentric corrugations are integrally formed by thermoforming. In a method of manufacturing a speaker damper consisting of a conductive member mounted in the outer peripheral direction from the inner peripheral part along the shape of the corrugation, after impregnating a thermosetting resin into a damper material composed of a cloth material, A method for manufacturing a speaker damper, characterized in that a conductive member made of a flat mesh tinsel wire is sewn with fibers, and a plurality of corrugations mounted with the conductive member are integrally formed by thermoforming in this state.