JP3888369B2 - Speaker member and manufacturing method thereof - Google Patents

Description

  The present invention relates to a speaker member having a diaphragm portion and an edge portion. More specifically, the present invention relates to a speaker member in which a diaphragm portion and an edge portion are formed using the same material, and both the diaphragm portion and the edge portion satisfy required characteristics.

  In general, in a speaker, the diaphragm and the edge are formed of different materials. This is because the performance required for the diaphragm and the edge is completely different. That is, since the diaphragm generates sound waves by pushing the front and back air to generate a dense wave, the diaphragm needs to be strong enough to withstand the pressure of the air. On the other hand, the edge is required to have flexibility that can follow the movement of the diaphragm and vibration absorbability that can absorb vibration without reflecting the sound wave propagated through the diaphragm. Thus, since the required performance differs between the diaphragm and the edge, in order to satisfy each required performance, the conventional speaker forms the diaphragm and the edge separately from different materials and bonds them together. It is manufactured by. Therefore, in manufacturing a conventional speaker, material costs are incurred for each of the diaphragm and the edge, and the respective molding process and bonding process are required. Therefore, the production of the conventional speaker has a problem that the cost is very high and the production efficiency is low.

  In order to solve such a problem, a technique has been proposed in which a diaphragm portion and an edge portion are simultaneously formed when pulp corn is made. However, in this technique, a resin layer must be provided on the edge in order to prevent the ventilation of the edge and suppress the reflection of the diaphragm. Therefore, the number of manufacturing steps is complicated and the edge portion bent by the vibration of the diaphragm is insufficient in durability and water resistance due to the low strength of the pulp fiber as the core material, and a resin layer is provided. As a result, there is a problem that the edge flexibility is insufficient.

  As another method, a technique for simultaneously forming a diaphragm and an edge by two-color injection molding has been proposed. However, in this technique, since the usable material is limited to the thermoplastic resin, the heat resistance and elastic modulus of the obtained speaker are insufficient.

  Further, a technique for forming a roll-shaped edge at the same time as forming a resin film or a metal foil into a cone-shaped or dome-shaped diaphragm shape has been proposed. However, in this technique, no contrivance has been made for simultaneously satisfying the contradictory performance requirements of the diaphragm and the edge, and the strength of the edge becomes the same as that of the diaphragm. As a result, a sufficient amplitude cannot be obtained and there is almost no edge vibration absorption, so that a speaker that can withstand practical use cannot be obtained.

  Some planar speakers do not have edges. However, a generally used planar speaker having an edge can be obtained by adhering a diaphragm and an edge formed from different materials, similarly to the speaker having a cone-shaped diaphragm. Furthermore, the conventional planar diaphragm uses a styrene foam material in order to increase the thickness and reduce the weight in order to increase the strength. Since such a flat diaphragm has a small internal loss, divided vibration is likely to occur, and as a result, a peak dip in the frequency characteristic (a fluctuation in the sound pressure level in the frequency-sound pressure characteristic) increases. Although a planar diaphragm made of an aluminum honeycomb is also used, such a planar diaphragm also has a large peak dip due to its small internal loss, and as a result, a sound with inherent wrinkles is generated.

  As described above, attempts have been made to form the diaphragm and the edge at the same time, but the present situation is that a speaker member that satisfies the required performance of the diaphragm and the edge has not been obtained.

  Therefore, there is a strong demand for a speaker member in which a diaphragm portion and an edge portion are easily formed and both the diaphragm portion and the edge portion have excellent required performance.

  The present invention has been completed by finding that the diaphragm member and the edge portion are formed using the same material, so that a speaker member can be obtained in which the diaphragm and the edge satisfy the required performance. .

  The speaker member of the present invention is a speaker member having a vibration plate portion including a base material and a thermosetting resin impregnated in the base material, and an edge portion including the same base material as the vibration plate portion. The base material is made of a nonwoven fabric made of thermoplastic elastomer fibers, para-aramid fibers, meta-aramid fibers, or polyarylate fibers.

  In a preferred embodiment, the thermoplastic elastomer fiber is selected from a polyurethane elastomer fiber, a polyamide elastomer fiber, a polystyrene elastomer fiber, a polyester elastomer fiber, and an ethylene / vinyl acetate elastomer fiber.

  Another speaker member of the present invention is a speaker having a diaphragm portion including a base material and a thermosetting resin impregnated in the base material, and an edge portion including the same base material as the diaphragm portion. The base material is an elastic woven fabric made of saturated polyester fibers.

  In a preferred embodiment, the saturated polyester fiber is a poly (trimethylene terephthalate) fiber.

  In a preferred embodiment, the thermosetting resin is an unsaturated polyester resin.

  In a preferred embodiment, the thermosetting resin further contains short fibers of natural fibers, regenerated fibers or synthetic fibers, or a mixture thereof.

  In a preferred embodiment, the edge portion includes a photocurable resin impregnated in the substrate.

  In a preferred embodiment, the photocurable resin is an acrylic resin.

  In a preferred embodiment, the edge portion includes a thermosetting resin different from the thermosetting resin impregnated in the diaphragm portion.

  In a preferred embodiment, the thermosetting resin contained in the edge portion further contains short fibers of natural fibers or synthetic fibers, or a mixture thereof.

  In a preferred embodiment, the thermosetting resin contained in the edge portion is a thermosetting polyether urea elastomer.

  In a preferred embodiment, the diaphragm portion is a cone type.

  In a preferred embodiment, the diaphragm portion is a planar type.

  In a preferred embodiment, the diaphragm portion has a reinforcing portion.

  The method for manufacturing a speaker member of the present invention includes a step of forming a base material, a step of impregnating a thermosetting resin in a portion to be a diaphragm portion of the base material, and curing the impregnated thermosetting resin. Forming a diaphragm portion and simultaneously forming an edge portion, and the base material is made of a nonwoven fabric made of thermoplastic resin elastomer fiber, para-type aramid fiber, meta-type aramid fiber, or polyarylate fiber .

  Another method for manufacturing the speaker member of the present invention includes a step of forming a base material, a step of impregnating a portion of the base material to be a diaphragm portion with a thermosetting resin, and the impregnated thermosetting resin. Forming a diaphragm portion and simultaneously forming an edge portion, and the base material is made of an elastic woven fabric made of saturated polyester fibers.

  According to the present invention, the diaphragm portion and the edge portion can be formed using the same material by selectively applying a predetermined thermosetting resin to a portion to be the diaphragm portion of the base material. And the member for speakers in which the diaphragm part and the edge part have the outstanding required characteristic is obtained. Furthermore, according to the present invention, a manufacturing method with low cost and excellent manufacturing efficiency can be obtained.

(Embodiment 1)
The speaker member of the present invention has a diaphragm portion and an edge portion. That is, the speaker member of the present invention is integrated and has the function of the diaphragm and the function of the edge at the same time. As the shape of the diaphragm portion, any appropriate shape (for example, a cone type, a dome type, a plane type, and a cone type are most widely used) can be adopted. In the present embodiment, the shape of the diaphragm portion will be described without particular limitation.

  The diaphragm portion includes a base material and a thermosetting resin impregnated in a part of the base material. The substrate may be a woven fabric or a non-woven fabric.

  The nonwoven fabric substrate may be a single nonwoven fabric or a laminate having a plurality of nonwoven fabric layers.

  The nonwoven fabric (layer) is formed from any suitable short fiber. Typical examples of such short fibers include para-type aramid fibers, meta-type aramid fibers, rayon fibers, cotton fibers, ultra-high strength polyethylene fibers, and polyarylate fibers. Para-aramid fibers are preferred because of the large internal loss of the fibers and excellent strength. Although the fiber length of a short fiber may change according to the objective, it is typically 30-60 mm. A nonwoven fabric (layer) may be formed from a single short fiber, and may be formed combining 2 or more types of short fibers.

  Preferably, the nonwoven fabric substrate is a laminate having at least two nonwoven fabric layers and a resin film layer provided between the nonwoven fabric layers. Since the resin film layer is melted and solidified at the time of molding, it becomes easy to mold the edge portion. Furthermore, since the obtained edge part contains the solidified resin film, ventilation | gas_flowing of an edge part is prevented favorably. The laminated body typically has two nonwoven fabric layers and a resin film layer provided between the nonwoven fabric layers. The nonwoven fabric layers of the laminate may be formed from the same fiber material (short fibers), or may be formed from different fiber materials.

  Preferably, the resin film layer is made of any appropriate thermoplastic elastomer. Representative examples of thermoplastic elastomers include urethane elastomers, amide elastomers, olefin elastomers, styrene elastomers, polyester elastomers, and ethylene / vinyl acetate elastomers. A urethane-based elastomer is preferred because of its large internal loss. The thermoplastic elastomer is formed into a film shape by any appropriate method and used as a resin film layer. The thickness of the resin film layer can vary depending on the purpose, but is typically 0.03 to 0.10 mm.

  Particularly preferred configurations of the laminate include para-aramid fiber / urethane elastomer / para-aramid fiber, para-aramid fiber / urethane elastomer / rayon fiber, para-aramid fiber / urethane elastomer / cotton fiber, and meta-aramid. Fiber / urethane elastomer / meta-type aramid fiber, para-type aramid fiber / olefin-based elastomer / para-type aramid fiber, para-type aramid fiber / styrene-type elastomer / para-type aramid fiber, para-type aramid fiber / amide-type elastomer / para-type Examples include aramid fibers, and para-type aramid fibers / polyester elastomers / para-type aramid fibers. A particularly preferable constitution of the laminate is para-type aramid fiber / urethane elastomer / cotton fiber.

  According to another embodiment, the nonwoven fabric substrate is a laminate having at least two first nonwoven layers and a second nonwoven layer provided between the nonwoven layers. By using the first and second non-woven fabric layers, when the thermosetting resin is impregnated into the portion to be the diaphragm of the laminate, the vibration can be achieved simply by applying the thermosetting resin to one surface of the laminate. The entire portion to be the plate can be satisfactorily impregnated with the thermosetting resin. As a result, the elastic modulus of the obtained diaphragm portion is further improved. In addition, since the second nonwoven fabric layer is melted and solidified at the time of molding, the ventilation of the edge portion is maintained well.

  Typically, the material constituting the first nonwoven fabric layer is the same as that of the nonwoven fabric substrate. The second non-woven fabric layer is preferably a non-woven fabric (hereinafter also referred to as an elastomer non-woven fabric) formed from thermoplastic elastomer fibers. Here, the elastomer nonwoven fabric refers to a nonwoven fabric in which thermoplastic elastomer fibers are randomly entangled, and a part thereof may be melted. Typical examples of thermoplastic elastomer fibers include polyurethane elastomer fibers, polyamide elastomer fibers, polystyrene elastomer fibers, polyamide elastomer fibers, polyester elastomer fibers, and ethylene / vinyl acetate elastomer fibers. A urethane-based elastomer fiber is preferable because the internal loss is large. Since the elastomer nonwoven fabric can be easily impregnated with a thermosetting resin, a speaker member having an excellent elastic modulus can be obtained. Furthermore, since the elastomer nonwoven fabric includes many voids (air portions) therein, the thickness per unit area increases, and as a result, a speaker member having excellent rigidity can be obtained. The second nonwoven layer is formed from a thermoplastic elastomer by any suitable method.

  Alternatively, the nonwoven substrate can be an elastomeric nonwoven alone.

  According to yet another embodiment, the nonwoven fabric substrate is a laminate having a nonwoven fabric layer and an elastic woven fabric layer provided between the nonwoven fabric layers. Here, the elastic woven fabric refers to a woven fabric having elasticity (that is, capable of expanding and contracting). The elastic woven fabric is formed by any appropriate method. The nonwoven layer can be the same as described above. By using the elastic woven fabric layer, the internal loss of the edge portion can be improved while maintaining the elastic modulus of the diaphragm portion. Further, since the elastic woven fabric is melted and solidified at the time of molding, the ventilation of the edge portion is well maintained.

  Preferably, the elastic woven fabric layer is made of a saturated polyester fiber. Particularly preferred saturated polyester fibers are poly (trimethylene terephthalate) fibers. This is because poly (trimethylene terephthalate) fibers are highly elastic, have large internal loss, and have excellent flexibility.

  Alternatively, the base material may be a woven fabric alone. As described above, the woven fabric substrate is preferably an elastic woven fabric made of saturated polyester fibers. More preferably, the woven fabric substrate is made of poly (trimethylene terephthalate) fibers. This is because poly (trimethylene terephthalate) has a very good internal loss, and as a result, a speaker member having a very good internal loss is obtained.

  The nonwoven fabric substrate, laminate substrate, elastomer nonwoven fabric substrate, or woven fabric substrate can be appropriately selected depending on the purpose.

  Any appropriate thermosetting resin is used as the thermosetting resin impregnated in the substrate, and an unsaturated polyester resin is preferable. It is because it hardens in the shortest time. In the present invention, any appropriate unsaturated polyester resin is used. Thermosetting resins (eg, unsaturated polyester resins) are in the form of liquid compositions and many products are commercially available.

  Preferably, such a thermosetting resin composition may further contain natural fibers, regenerated fibers, or short fibers of synthetic fibers, or a mixture thereof (hereinafter also referred to as additive fibers). The additive fiber preferably has a fiber length of 20 mm or less, more preferably 5 mm or less (note that the shortest fiber length in practice is 1 mm). This is because, as the fiber length of the additive fiber is shorter, the additive fiber is more easily dispersed in the thermosetting resin, and as a result, the substrate is excellent in impregnation properties. Therefore, considering that the longer fiber length can contribute to the improvement of the elastic modulus and the balance between the impregnation property and the elastic modulus of the obtained speaker member, the fiber length of the added fiber is preferably shorter.

  Typical examples of natural fibers include cotton and hemp. Representative examples of recycled fibers include rayon and polynosic. Representative examples of synthetic fibers include nylon, vinylon, aramid fiber, carbon fiber, polyarylate fiber, and heterocycle-containing aromatic fiber. High elastic fibers such as aramid fibers, carbon fibers, polyarylate fibers, and heterocyclic ring-containing aromatic fibers are preferred. This is because a speaker member having an excellent elastic modulus can be obtained.

  Preferably, the additive fiber may be added at a ratio of 5 to 30 parts by weight, more preferably 10 to 15 parts by weight, with respect to 100 parts by weight of the thermosetting resin. This is because when the added fiber is added to the thermosetting resin in such a range, both the impregnation property and the elastic modulus of the obtained speaker member are excellent.

  The edge portion includes the same base material as the diaphragm portion.

  Preferably, the edge portion is impregnated with the photocurable resin on the substrate. Arbitrary appropriate photocurable resin is used, Typically, acrylic resin is mentioned.

Or the thermosetting resin different from the thermosetting resin contained in the said diaphragm part may be impregnated in the base-material part used as an edge. By including a thermosetting resin in the edge portion, the heat resistance of the edge portion is remarkably improved. As such a thermosetting resin, a thermosetting polyether urea elastomer can be suitably used. Since the polyether urea elastomer is very flexible, not only the heat resistance of the obtained edge portion is improved, but also the amplitude can be increased. As a result, a speaker member having sufficient performance for a full range can be obtained. For example, such a polyether urea elastomer has the following properties: rubber hardness 73, tensile strength 298 kg / cm ² , elongation at break 425%, melting point 200 ° C. or higher.

  Hereinafter, first, a method for forming a substrate will be described, and then a method for manufacturing a speaker member according to a preferred embodiment of the present invention will be described with reference to the drawings.

(Substrate formation method)
For example, when the substrate is a single nonwoven fabric, the nonwoven fabric is formed from the short fibers using any appropriate method. Typical examples of the method for forming the nonwoven fabric include a fluid entanglement method using a liquid such as water or a gas such as air, or a method of mechanically tangling short fibers randomly. The fluid entanglement method is preferable in that a nonwoven fabric having a low elastic modulus anisotropy and good moldability can be obtained. For example, the nonwoven fabric can be obtained by orienting the short fibers randomly by an air flow by a dry method to create an accumulation layer, and then entwining the fibers of the accumulation layer by a hydroentanglement method. The basis weight of the nonwoven fabric used in the present invention may vary depending on the purpose, but is typically 30 to 150 g / m ² . For example, when the substrate is a laminate having two nonwoven fabric layers and a resin film layer provided between the nonwoven fabric layers, the nonwoven fabric layer and the resin film layer are formed by any appropriate method. After that, it may be laminated by any appropriate method. In addition, the base material which consists of an elastomer nonwoven fabric, or a woven fabric base material can also be produced by arbitrary appropriate methods.

(Speaker manufacturing method)
Hereinafter, the case where the substrate is a single nonwoven fabric will be described with reference to FIG. 1 (it goes without saying that the method of the present invention can be applied to other types of substrates as well). As shown in FIG. 1, the nonwoven fabric substrate 1 a is prepared by being wound around a supply device 1 in a roll shape, and sent out from the supply device 1 according to the flow of the process. In order to prevent deformation at the time of molding, both sides of the fed nonwoven fabric substrate 1a with respect to the feeding direction are supported by the clamp 2 so as to be movable.

  Next, a thermosetting resin is selectively supplied from the resin supply nozzle 3a to the diaphragm portion of the nonwoven fabric substrate 1a, and further selectively from the resin supply nozzle 3b to the portion corresponding to the diaphragm of the lower mold 4b. To be supplied. Although the thermosetting resin may be supplied only to one side of the nonwoven fabric 1a, it is preferably supplied to both the upper side and the lower side of the nonwoven fabric substrate 1a as shown in FIG. This is because impregnation from both sides of the substrate prevents the thermosetting resin from being unevenly distributed on one side of the diaphragm portion. In particular, when the nonwoven fabric substrate is a laminate having a resin film layer or an elastic woven fabric layer, the effect is remarkable. When the nonwoven fabric substrate is a laminate having an elastomer nonwoven fabric layer, the thermosetting resin is unevenly distributed on one side of the diaphragm portion only by supplying the thermosetting resin only to one side of the nonwoven fabric 1a. Without impregnating, the entire diaphragm portion can be satisfactorily impregnated.

  Next, the nonwoven fabric 1a supplied with the thermosetting resin is hot-pressed using the upper mold 4a and the lower mold 4b having a shape in which the diaphragm portion and the edge portion are integrated. As a result, only the diaphragm portion of the nonwoven fabric substrate 1a is impregnated and cured by rolling to form the diaphragm portion 5, and at the same time, the edge portion 6 is formed by melting and solidifying the substrate. It is formed. When using the laminated body which has a resin film layer as the nonwoven fabric base material 1a, the resin film layer fuse | melts by hot press, and the edge part 6 is formed when it solidifies after that. Finally, die cutting and outer periphery cutting are performed, and the speaker member 7 is obtained.

In addition, arbitrary appropriate conditions can be employ | adopted for the conditions (for example, die temperature, press pressure, press time, die clearance) of hot press according to the objective and the nonwoven fabric base material to be used. Typically, the mold temperature is 100 to 130 ° C., the heating time is 0.5 to 3 minutes, the pressing pressure is 15 to 25 kg / cm ² , and the mold clearance (corresponding to the thickness of the obtained speaker member). ) Is 0.1 to 0.3 mm.

  Next, with reference to FIG. 2, the manufacturing method of the member for speakers by another embodiment of this invention is demonstrated. For simplicity, only the steps characteristic of this embodiment will be described (unless otherwise specified, the procedure described with reference to FIG. 1 may be applied).

The thermosetting resin is supplied to both sides of the nonwoven fabric substrate 1a using the resin supply nozzles 3a and 3b, and the upper mold 4a and the lower mold 4b are formed by integrating the diaphragm portion and the edge portion. And hot press. As a result, the diaphragm portion 5 is formed by impregnating and curing the thermosetting resin, and at the same time, the edge portion 6 is preformed. A photocurable resin is applied from the resin supply nozzle 8 to the preformed edge portion 6. Any suitable ultraviolet irradiation lamp (for example, mercury lamp) 9 is used to irradiate ultraviolet rays to cure the photocurable resin. As the ultraviolet irradiation condition, any appropriate condition may be adopted depending on the type of the photocurable resin to be used. However, when the photocurable resin is an acrylic resin, typically, 600 to 900 mW / cm. Irradiation at an irradiation density of ² for 30-60 seconds. In this way, an edge portion having desired characteristics is formed. Finally, die cutting and outer periphery cutting are performed, and the speaker member 7 is obtained.

  A method for manufacturing a speaker member according to still another embodiment of the present invention will be briefly described. A predetermined thermosetting resin (for example, unsaturated polyester) is supplied from the resin supply nozzle to the portion to be the diaphragm portion of the nonwoven fabric substrate, and at the same time, another thermosetting is applied to the portion to be the edge portion of the nonwoven fabric substrate. Resin (for example, thermosetting polyether urea elastomer) is supplied from another resin supply nozzle. Next, this nonwoven fabric substrate is hot-pressed using an upper mold and a lower mold having a shape in which the diaphragm portion and the edge portion are integrated. As a result, the diaphragm portion and the edge portion are simultaneously molded by impregnating and curing the two types of thermosetting resins.

(Embodiment 2)
Next, as another embodiment of the present invention, a speaker member having a planar diaphragm portion and an edge portion will be described. Hereinafter, only the characteristic features of the planar speaker member will be described with reference to FIGS. 3A to 3D.

  FIG. 3 is a view for explaining a flat speaker member according to a preferred embodiment of the present invention, and FIG. 3A is a plan view thereof. 3B is a cross-sectional view of the speaker member of FIG. 3A along line BB. FIG. 3C is an enlarged view of a portion surrounded by an ellipse in FIG. 3B. 3D is a cross-sectional view taken along line CC of the speaker member in FIG. 3A. The planar speaker member 10 includes a planar diaphragm portion 11 and an edge portion 12. Preferably, the planar diaphragm portion 11 has a reinforcing portion 13. The reinforcing portion 13 is provided to maintain the strength of the planar diaphragm portion 11. The reinforcing portion 13 is formed from the same material as the planar diaphragm portion 11. The reinforcing portion 13 has any appropriate shape, and is formed at any appropriate portion of the planar diaphragm portion 11. As shown in FIG. 3D, the reinforcing portion 13 is typically provided on the outer peripheral portion of the planar diaphragm portion 11. More specifically, the reinforcing portion 13 is formed by bending the outer peripheral portion of the planar diaphragm portion 11. An edge portion 12 is formed so as to extend from the ends of the diaphragm portion 11 and the reinforcing portion 13.

  The speaker member of the present embodiment can also be manufactured by the same method as that of the first embodiment. In this method, the speaker member of this embodiment can be obtained by using a mold having a shape in which the planar diaphragm portion and the edge portion are integrated. Furthermore, when the planar diaphragm portion has a reinforcing portion, a die having a shape in which the planar diaphragm portion having the reinforcing portion and the edge portion are integrated may be used.

  The operation of the present invention will be described below.

  According to the present invention, since the same base material is used for the diaphragm portion and the edge portion, it is not necessary to bond the diaphragm and the edge as in the prior art. Therefore, the disadvantage of the prior art that the durability and water resistance of the bonded portion is insufficient is eliminated. In fact, the speaker member of the present invention has sufficient durability and water resistance to be put into practical use as a vehicle-mounted speaker that requires excellent durability and water resistance. Furthermore, according to the present invention, since the predetermined thermosetting resin is selectively impregnated only in the diaphragm portion, the characteristics that can be satisfied in both the diaphragm portion and the edge portion that require opposite properties. Is obtained. That is, the diaphragm portion of the speaker member of the present invention has excellent strength, and the edge portion has excellent flexibility and internal loss. In addition, since the speaker member of the present invention uses a thermosetting resin, it is excellent in heat resistance.

  The substrate may be a woven fabric or a non-woven fabric. In one preferred embodiment, the substrate consists of an elastomeric nonwoven fabric. In another preferred embodiment, the substrate consists of an elastic woven fabric. Since any of these substrates can be easily impregnated with a thermosetting resin, a speaker member having an excellent elastic modulus can be obtained. Furthermore, since these base materials contain many voids (air portions) therein, the thickness per unit area increases. As a result, an edge portion having excellent rigidity (that is, the ability to support the diaphragm) is obtained. In addition, when these base materials are used, a speaker member having an excellent elastic modulus and internal loss can be obtained because the material itself has an excellent elastic modulus and internal loss.

  In yet another preferred embodiment, the substrate is a laminate having a nonwoven fabric layer and a resin film layer disposed between the nonwoven fabric layers. When such a laminate is used, the resin film layer melts and solidifies at the time of molding, so that it becomes easy to mold the edge portion, and the edge portion of the obtained speaker member includes the solidified resin film. The ventilation of the part is very well prevented.

  According to still another embodiment, the nonwoven fabric base material includes a laminate having two first nonwoven fabric layers and a second nonwoven fabric layer (for example, an elastomer nonwoven fabric layer) disposed between the nonwoven fabric layers. It is. By using the laminate having the second nonwoven fabric layer, the entire diaphragm portion can be satisfactorily impregnated with the thermosetting resin simply by applying the thermosetting resin from one side of the nonwoven fabric. The elastic modulus of the plate can be further improved. In addition, the state where the ventilation of the edge portion is well prevented is maintained.

  According to yet another embodiment, the nonwoven fabric substrate is a laminate having a nonwoven fabric layer and an elastic woven fabric layer disposed between the nonwoven fabric layers. By using the elastic woven fabric layer, the internal loss of the edge portion can be improved while maintaining the elastic modulus of the diaphragm portion. In addition, the state where the ventilation of the edge portion is well prevented is maintained. These base materials can be appropriately selected and used according to the purpose.

  In a preferred embodiment, the edge portion is impregnated with a thermosetting resin different from the thermosetting resin contained in the diaphragm portion. By impregnating the edge portion with a thermosetting resin, the heat resistance of the edge portion is remarkably improved. Further, by using a very flexible thermosetting resin such as a polyether urea elastomer, not only the heat resistance of the obtained edge portion can be improved, but also the amplitude can be increased. As a result, a speaker member having sufficient performance for a full range can be obtained.

  Furthermore, according to the present invention, a planar speaker member is obtained. Such a flat speaker member uses the same nonwoven fabric base material for the flat diaphragm portion and the edge portion, and is selectively impregnated with a thermosetting resin only in the flat diaphragm portion. The diaphragm portion has excellent strength, and the edge portion has excellent internal loss. In a preferred embodiment, the planar speaker member has at least two nonwoven fabric layers and a resin film layer, an elastomer nonwoven fabric layer, or an elastic woven fabric layer provided between the nonwoven fabric layers. As a result, the planar diaphragm portion has both excellent strength and high internal loss. Therefore, it is possible to eliminate the disadvantage that the conventional flat type diaphragm using the styrene foam material cannot maintain the strength when the thickness is reduced, and an extremely excellent thickness reduction can be achieved. In fact, the planar speaker member of the present invention can withstand vibration even when the thickness is reduced to about 0.2 mm. Furthermore, the planar speaker member of the present invention has a high internal loss. As a result, the divided vibration, which is a problem in the conventional flat diaphragm using the styrene foam material or the aluminum honeycomb, can be prevented very well, and the peak dip can be reduced. That is, it is possible to prevent the sound with inherent wrinkles that occurs in the conventional flat speaker. Further, the planar speaker member of the present invention has the problem that the durability of the bonded portion is insufficient because the planar diaphragm portion and the edge portion are integrally formed.

  Preferably, the planar diaphragm portion has a reinforcing portion. The reinforcing portion is provided to maintain the strength of the planar diaphragm portion. By providing the reinforcing portion in the planar diaphragm portion, the strength is further improved, and the divided vibration and the peak dip can be further reduced.

  Furthermore, according to the manufacturing method of the present invention, since the diaphragm portion and the edge portion are formed from the same base material, the material loss and the number of manufacturing steps are significantly reduced. As a result, the production method of the present invention is low in cost and excellent in production efficiency.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples. Unless otherwise indicated, parts and percentages in the examples are based on weight.

A. A member for a speaker integrally formed with a base material of a nonwoven fabric / resin film / nonwoven fabric laminate (Example 1)
An unsaturated polyester solution having the following composition was prepared:
Unsaturated polyester resin (Nippon Shokubai Co., Ltd .; N350L): 100 (parts)
Mica (Kuraray Co., Ltd .; CLARITE MICA 600W): 30
Low shrinkage agent (Nippon Yushi Co., Ltd .; Modiper S501): 5
Perocta O (Nippon Yushi Co., Ltd.): 3
On the other hand, short fibers of para-type aramid fibers (manufactured by Teijin Ltd., Technora; fiber length: 38 mm) are randomly oriented with an air stream by a dry method to create an accumulation layer, and then the fibers are machined by a hydroentanglement method. Was entangled to prepare a nonwoven fabric with a weight of 35 g / m ² . Using two of the obtained nonwoven fabrics, create a laminate in which a polyurethane elastomer film (Takeda Birdish Urethane Industry Co., Ltd., Elastollan NY type; thickness 0.05 mm) is placed between the nonwoven fabrics. did.

The unsaturated polyester solution is selectively applied at a density of about 125 to 150 g / m ² to the central portion (that is, the portion to be the diaphragm) of the laminate, and the diaphragm portion and the edge portion are integrated. Using a matched die (die) having the shape described above, hot press molding was performed at 130 ° C. for 1 minute to obtain a cone type speaker member having a diaphragm portion with a diameter of 16 cm and a thickness of 0.25 mm.

  The Young's modulus, density, and specific modulus of the diaphragm portion of the obtained speaker member were measured by an ordinary method, and the Young's modulus, density, and internal loss were measured by an ordinary method of the edge portion. . The measurement results are shown in Table 1 below together with the results of Examples 2 to 8 and Comparative Examples 1 to 3 described later.

(Example 2)
A nonwoven fabric was produced in the same manner as in Example 1 from short fibers of rayon fibers (fiber length: 38 mm). A member for a speaker was obtained in the same manner as in Example 1 except that a laminate in which a urethane elastomer film was disposed between the obtained nonwoven fabric and the nonwoven fabric obtained in Example 1 was prepared. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

(Example 3)
A nonwoven fabric was prepared in the same manner as in Example 1 from short fibers of cotton fibers (fiber length: 38 mm). A member for a speaker was obtained in the same manner as in Example 1 except that a laminate was prepared in which a urethane elastomer film was disposed between the obtained nonwoven fabric and the nonwoven fabric obtained in Example 1. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

Example 4
A nonwoven fabric was prepared in the same manner as in Example 1 from short fibers of meta-type aramid fibers (manufactured by Teijin Ltd., Conex; fiber length: 38 mm). A member for a speaker was obtained in the same manner as in Example 1 except that two sheets of the obtained nonwoven fabric were used to prepare a laminate in which a urethane elastomer film was disposed between the nonwoven fabric and the nonwoven fabric. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

(Example 5)
A member for a speaker was obtained in the same manner as in Example 1, except that an olefin elastomer film (Mirasui Chemical Co., Ltd., Miralastomer 5030N; thickness 0.05 mm) was used instead of the urethane elastomer film. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

(Example 6)
A speaker member was obtained in the same manner as in Example 1 except that a styrene elastomer film (Kuraray Co., Ltd., Hibler 5127; thickness 0.05 mm) was used instead of the urethane elastomer film. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

(Example 7)
A speaker member was prepared in the same manner as in Example 1, except that an amide-based elastomer film (Daicel-Huels Co., Ltd., Daiamide PAE / E47-S1; thickness 0.05 mm) was used instead of the urethane-based elastomer film. Obtained. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

(Example 8)
A speaker member was obtained in the same manner as in Example 1 except that a polyester elastomer film (manufactured by Toray DuPont, Hytrel 4057; thickness 0.05 mm) was used instead of the urethane elastomer film. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

(Comparative Example 1)
From the pulp suspension, a cone and a roll-shaped edge were formed on the outer periphery of the cone by a regular method. Next, an acrylic resin was applied to the edge portion and dried to obtain an edge-integrated pulp cone diaphragm having a diameter of 16 cm and a thickness of 0.85 mm. The obtained diaphragm was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

(Comparative Example 2)
The diaphragm part is molded with polypropylene resin (containing 30% by weight of mica) by two-color molding of injection molding, and an olefin elastomer is molded into an edge shape on its outer periphery, resulting in a caliber of 16 cm and a thickness of 0.28 mm. An integral diaphragm of polypropylene corn / olefin elastomer edge was obtained. The obtained diaphragm was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

(Comparative Example 3)
A roll edge integrated dome diaphragm having a diameter of 25 mm was obtained by hot press-molding a titanium foil having a thickness of 50 μm with a matched die mold in which a dome diaphragm portion and a roll mold edge portion were integrated on the outer periphery thereof. . The obtained diaphragm was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.

B. A member for a speaker in which an edge portion of an integrally molded substrate is impregnated with a photocurable resin (Example 9)
An unsaturated polyester solution similar to that in Example 1 was prepared. On the other hand, short fibers of para-type aramid fibers (manufactured by Teijin Ltd., Technora; fiber length: 38 mm) are randomly oriented with an air stream by a dry method to create an accumulation layer, and then the fibers are machined by a hydroentanglement method. Was entangled to prepare a nonwoven fabric with a weight of 35 g / m ² .

The unsaturated polyester solution is selectively applied at a density of about 125 to 150 g / m ² to the central portion (that is, the portion to be a diaphragm) of the obtained nonwoven fabric, and the diaphragm portion and the edge portion are integrated. Using a matched die mold having a modified shape, hot press molding was performed at 130 ° C. for 1 minute to cure the diaphragm portion and at the same time preformed the edge portion.

Next, an ultraviolet curable resin is applied to the preformed edge portion at a density of about 90 to 110 g / m ² , and then ultraviolet rays are irradiated at an irradiation density of 750 mW / cm ² for 30 seconds using an ultraviolet lamp. The ultraviolet curable resin was cured to obtain a cone type speaker member having a diaphragm portion with a diameter of 16 cm and a thickness of 0.23 mm.

  The Young's modulus, density, and specific elastic modulus of the diaphragm portion of the obtained speaker were measured by ordinary methods, and the Young's modulus, density, and internal loss were measured by ordinary methods for the edge portion. The measurement results are shown in Table 2 below together with the results of Examples 10 to 12 described later.

(Example 10)
A speaker member was obtained in the same manner as in Example 9 except that rayon fiber (fiber length: 38 mm) was used instead of para-aramid fiber. The obtained speaker member was subjected to the same evaluation as in Example 9. The results are shown in Table 2 above.

(Example 11)
A speaker member was obtained in the same manner as in Example 9 except that cotton fiber (fiber length: 38 mm) was used instead of para-aramid fiber. The obtained speaker member was subjected to the same evaluation as in Example 9. The results are shown in Table 2 above.

(Example 12)
A speaker member was obtained in the same manner as in Example 9 except that meta-aramid fiber (manufactured by Teijin Ltd., Conex; fiber length 38 mm) was used instead of para-aramid fiber. The obtained speaker member was subjected to the same evaluation as in Example 9. The results are shown in Table 2 above.

C. A speaker member integrally formed from a nonwoven fabric as a base material (Example 13)
A speaker member was prepared in the same manner as in Example 1 except that a urethane elastomer nonwoven fabric (manufactured by Kanebo Synthetic Co., Ltd., Espancione; basis weight 200 g / m ² ) was used instead of the laminate used in Example 1. Obtained. The diaphragm portion of the speaker member has a cone shape with a diameter of 16 cm and a thickness of 0.23 mm, the resin content is about 55%, and the edge portion has a roll shape with a width of 13 mm and a thickness of 0.50 mm. It was. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 3 below together with the results of Examples 14 to 18 described later.

(Example 14)
A speaker member was obtained in the same manner as in Example 13, except that 20 parts of para-type aramid short fibers (Technola; fiber length 6.0 mm) were further contained in the unsaturated polyester solution. The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 3 above.

(Example 15)
A speaker member was obtained in the same manner as in Example 13 except that 20 parts of polyarylate short fiber (Kuraray Co., Ltd., Vectran; fiber length 6.0 mm) was further added to the unsaturated polyester solution. The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 3 above.

(Example 16)
Speaker as in Example 13, except that 20 parts of polyparaphenylene benzbisoxazole (PBO) short fiber (Toyobo Co., Ltd., Zylon; fiber length 6.0 mm) was further added to the unsaturated polyester solution. A member was obtained. The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 3 above.

(Example 17)
A speaker member was obtained in the same manner as in Example 13 except that the unsaturated polyester solution further contained 20 parts of carbon fiber short fibers (Toray Industries, Inc., trading card; fiber length 6.0 mm). The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 3 above.

(Example 18)
A speaker member was obtained in the same manner as in Example 13 except that 20 parts of ultrahigh-strength polyethylene short fibers (Toyobo Co., Ltd., Dyneema; fiber length 6.0 mm) were further added to the unsaturated polyester solution. . The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 3 above.

D. A member for a speaker integrally formed with an elastic woven fabric as a base material (Example 19)
For speakers as in Example 1, except that an elastic woven fabric (made by Shell Chemical Co., Corterra; basis weight 200 g / m ² ) made of saturated polyester fiber was used instead of the laminate used in Example 1. A member was obtained. The diaphragm portion of the speaker member has a cone shape with a diameter of 16 cm and a thickness of 0.23 mm, the resin content is about 55%, and the edge portion has a roll shape with a width of 13 mm and a thickness of 0.50 mm. It was. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 4 below together with the results of Examples 20 to 25 described later.

(Example 20)
A speaker member was obtained in the same manner as in Example 19 except that a saturated polyester elastic woven fabric different from that in Example 19 (Toray Industries, Inc., Tetoron; basis weight 200 g / m ² ) was used. The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 4 above.

(Example 21)
A speaker member was obtained in the same manner as in Example 19 except that the unsaturated polyester solution further contained 20 parts of para type aramid short fibers (manufactured by Teijin Ltd., Technora; fiber length 6.0 mm). The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 4 above.

(Example 22)
A speaker member was obtained in the same manner as in Example 19 except that the unsaturated polyester solution further contained 20 parts of polyarylate short fibers (Kuraray Co., Ltd., Vectran; fiber length 6.0 mm). The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 4 above.

(Example 23)
The speaker as in Example 19 except that 20 parts of polyparaphenylene benzbisoxazole (PBO) short fiber (Toyobo Co., Ltd., Zyron; fiber length 6.0 mm) was further added to the unsaturated polyester solution. A member was obtained. The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 4 above.

(Example 24)
A speaker member was obtained in the same manner as in Example 19 except that the unsaturated polyester solution further contained 20 parts of carbon fiber short fibers (Toray Industries, Inc., trading card; fiber length 6.0 mm). The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 4 above.

(Example 25)
A speaker member was obtained in the same manner as in Example 19 except that 20 parts of ultrahigh-strength polyethylene short fibers (Toyobo Co., Ltd., Dyneema; fiber length 6.0 mm) were further added to the unsaturated polyester solution. . The resin content of the diaphragm portion of the obtained speaker member was about 50%. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 4 above.

E. A speaker member integrally molded with the same base material and impregnated with a thermosetting resin having different edge portions from the diaphragm (Example 26)
An unsaturated polyester solution was prepared in the same manner as in Example 1. In addition, a polyether urea elastomer solution having the following composition was prepared:
Polyether urea elastomer E liquid A (Ihara Chemical Industry Co., Ltd .: SX-027 / A): 100 (parts)
Polyether urea elastomer B solution (Ihara Chemical Industry Co., Ltd .: SX-027 / B): 60.9

On the other hand, short fibers of para-type aramid fibers (manufactured by Teijin Ltd., Technora; fiber length: 38 mm) are randomly oriented with an air stream by a dry method to create an accumulation layer, and then the fibers are machined by a hydroentanglement method. Was entangled and a nonwoven fabric weighing 60 g / m ² was prepared and used as a substrate.

The unsaturated polyester solution is selectively applied at a density of about 125 to 150 g / m ^{2 on} the central portion (that is, the portion to be a diaphragm) of the base material, and further, the peripheral portion (that is, the edge). The polyether urea elastomer solution was applied at a density of about 60 to 120 g / m ² on the power portion. A cone-type speaker member was obtained by hot press molding at 130 ° C. for 3 minutes using a matched die mold having a shape in which the diaphragm portion and the edge portion were integrated, and further cured at 100 ° C. for 30 minutes. The diaphragm portion of the cone type speaker member had a roll shape having a diameter of 16 cm, a thickness of 0.23 mm, a resin content of about 55%, and an edge portion having a width of 13 mm and a thickness of 0.50 mm. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 5 below together with the results of Examples 27 to 30 described later.

(Example 27)
A speaker member was obtained in the same manner as in Example 26 except that a base material was prepared using a meta-type aramid fiber (manufactured by Teijin Ltd., Conex; fiber length: 38 mm). The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 5 above.

(Example 28)
A speaker member was obtained in the same manner as in Example 26 except that a rayon fiber nonwoven fabric (manufactured by Nippon Vilene Co., Ltd., XL-6040; fiber length 38 mm, basis weight 40 g / cm ² ) was used as a base material. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 5 above.

(Example 29)
A speaker member was obtained in the same manner as in Example 26 except that a cotton fiber nonwoven fabric (Nisshinbo Co., Ltd., Oikos / AP1040; fiber length 38 mm) was used as a base material. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 5 above.

(Example 30)
Silk short fibers (fiber length 58 mm) were boiled with weak alkaline hot water to refine the sericin content to less than 1%. A nonwoven fabric was produced from this silk thread and used as a substrate. The following procedure was performed in the same manner as in Example 26 to obtain a speaker member. The obtained speaker member was subjected to the same evaluation as in Example 1. The results are shown in Table 5 above.

F. Example of a speaker member integrally formed with a non-woven fabric / elastomer non-woven fabric / non-woven fabric substrate (Example 31)
An unsaturated polyester solution similar to that in Example 1 was prepared. On the other hand, short fibers of para-aramid fibers (manufactured by Teijin Ltd., Technora; fiber length: 38 mm) are randomly oriented with an air stream by a dry method to create an accumulation layer, and then fibers are joined by a hydroentanglement method. Were entangled mechanically to prepare a nonwoven fabric with a weight of 35 g / m ² . Two sheets of the obtained nonwoven fabric were used to prepare a laminate in which a urethane elastomer nonwoven fabric (Kanebo Co., Ltd., Espancione ES25A; basis weight 25 g / m ² ) was disposed between them.

The unsaturated polyester solution was selectively applied at a density of about 125 to 150 g / m ^{2 on} the central portion (that is, the portion to be the diaphragm) of the laminate, and the diaphragm portion and the edge portion were integrated. A cone-shaped speaker member having a diameter of 16 cm and a thickness of 0.23 mm was obtained by hot press molding at 130 ° C. for 1 minute using a shaped die having a shape.

  With respect to the obtained speaker member, Young's modulus, density, and specific elastic modulus of the diaphragm portion were measured by a usual method, and Young's modulus, density, and internal loss of the edge portion were measured by a usual method. The experimental results are shown in Table 6 below together with the results of Examples 32 to 34 described later.

(Example 32)
A nonwoven fabric was prepared in the same manner as in Example 31 from short fibers of rayon fibers (fiber length 38 mm). A laminate was prepared in which the same urethane-based elastomer nonwoven fabric as in Example 31 was placed between the obtained nonwoven fabric and the para-type aramid nonwoven fabric obtained in Example 31. The following procedure was performed in the same manner as in Example 31 to obtain a speaker member. The obtained speaker member was subjected to the same evaluation as in Example 31. The results are shown in Table 6 above.

(Example 33)
A nonwoven fabric was prepared in the same manner as in Example 31 from short fibers of cotton fibers (fiber length: 38 mm). A laminate was prepared in which the same urethane-based elastomer nonwoven fabric as in Example 31 was placed between the obtained nonwoven fabric and the para-type aramid nonwoven fabric obtained in Example 31. The following procedure was performed in the same manner as in Example 31 to obtain a speaker member. The obtained speaker member was subjected to the same evaluation as in Example 31. The results are shown in Table 6 above.

(Example 34)
A nonwoven fabric was prepared in the same manner as in Example 31 from short fibers of meta-type aramid fibers (manufactured by Teijin Ltd., Conex; fiber length: 38 mm). A member for a speaker was obtained in the same manner as in Example 31 except that two sheets of the obtained nonwoven fabric were used and a laminate in which the same urethane-based elastomer nonwoven fabric as in Example 31 was placed between them was created. The obtained speaker member was subjected to the same evaluation as in Example 31. The results are shown in Table 6 above.

G. Example of a speaker member integrally formed with a nonwoven fabric / elastic woven fabric / nonwoven fabric substrate (Example 35)
An unsaturated polyester solution similar to that in Example 1 was prepared. On the other hand, short fibers of para-aramid fibers (manufactured by Teijin Ltd., Technora; fiber length 38 mm) are randomly oriented with an air stream by a dry method to create an accumulation layer, and then fibers are joined together by a hydroentanglement method. A nonwoven fabric having a weight of 35 g / m ² was made by mechanically entanglement. A laminate in which an elastic woven fabric (a basis weight of 25 g / m ² ) of saturated polyester fibers (Cortterra manufactured by Shell Chemi Co., Ltd.) was disposed between the two obtained nonwoven fabrics was prepared.

The unsaturated polyester solution is selectively applied at a density of 125 to 150 g / m ^{2 on} the central portion (that is, the portion to be a diaphragm) of the laminate, and the diaphragm portion and the edge portion are integrated. Using a matched die mold, hot press molding was performed at 130 ° C. for 1 minute to obtain a cone type speaker member having a diameter of 16 cm and a thickness of 0.20 mm.

  The Young's modulus, density, and specific elastic modulus of the obtained diaphragm portion for a speaker were measured by a usual method, and the Young's modulus, density, and internal loss were measured for the edge portion by a usual method. The measurement results are shown in Table 7 below together with the results of Examples 36 to 38 described later.

(Example 36)
A nonwoven fabric was prepared in the same manner as in Example 35 from short fibers of rayon fibers (fiber length 38 mm). A laminate in which an elastic woven fabric of saturated polyester fibers similar to that in Example 35 was disposed between the obtained nonwoven fabric and the nonwoven fabric obtained in Example 35 was prepared. The following procedure was performed in the same manner as in Example 35 to obtain a speaker member. The obtained speaker member was subjected to the same evaluation as in Example 35. The measurement results are shown in Table 7 above.

(Example 37)
A nonwoven fabric was prepared in the same manner as in Example 35 from short fibers of cotton fibers (fiber length 38 mm). A laminate in which an elastic woven fabric of saturated polyester fibers similar to that in Example 35 was disposed between the obtained nonwoven fabric and the nonwoven fabric obtained in Example 35 was prepared. The following procedure was performed in the same manner as in Example 35 to obtain a speaker member. The obtained speaker member was subjected to the same evaluation as in Example 35. The measurement results are shown in Table 7 above.

(Example 38)
A nonwoven fabric was prepared in the same manner as in Example 35 from short fibers of meta-type aramid fibers (manufactured by Teijin Ltd., Conex; fiber length: 38 mm). A laminate in which an elastic woven fabric of saturated polyester fibers similar to that in Example 35 was disposed between the two obtained nonwoven fabrics was prepared. The following procedure was performed in the same manner as in Example 35 to obtain a speaker member. The obtained speaker member was subjected to the same evaluation as in Example 35. The measurement results are shown in Table 7 above.

H. Embodiment 39 A planar speaker member having a planar diaphragm portion and an edge portion integrally formed of the same base material (Example 39)
An unsaturated polyester solution having the following composition was prepared:
Unsaturated polyester resin (Nippon Shokubai Co., Ltd .; N350L): 100 (parts)
Graphite (manufactured by Nippon Graphite Co., Ltd .; CSPE): 20
Low shrinkage agent (Nippon Yushi Co., Ltd .; Modiper S501): 5
Perocta O (Nippon Yushi Co., Ltd.): 3

On the other hand, short fibers of para-type aramid fibers (manufactured by Teijin Ltd., Technora; fiber length: 38 mm) are randomly oriented with an air stream by a dry method to create an accumulation layer, and then the fibers are machined by a hydroentanglement method. Was entangled and a nonwoven fabric having a basis weight of 60 g / m ² was prepared. A laminate in which a polyurethane-based elastomer film (manufactured by Takeda Burdish Urethane Kogyo Co., Ltd., Elastollan / NY type, thickness: 0.07 mm) is placed between the nonwoven fabric and the nonwoven fabric using two of the obtained nonwoven fabrics. Created.

  The unsaturated polyester solution (application amount: 2.22 to 2.49 g) is selectively applied to the central portion (that is, the portion to be a vibration plate) of this laminate, and a planar vibration having a reinforcing portion. Using a matched die mold having a shape in which the plate portion and the edge portion are integrated, press molding is performed at 130 ° C. for 1 minute, and the size of the diaphragm portion is 62 mm × 100 mm and the thickness is 0.2 mm. A speaker member having a mold diaphragm portion and an edge portion was obtained. About the obtained speaker member, the frequency-sound pressure characteristic was measured by the usual method. The measurement results are shown in FIG. In FIG. 4, the horizontal axis indicates frequency (Hz) in logarithm, and the vertical axis indicates sound pressure (dB).

(Comparative Example 4)
By bonding a diaphragm (size: 62 mm × 100 mm, thickness: 3 mm) made of a foam material (modified PPO (polyphenylene oxide)) and an edge made of polyurethane elastomer (thickness: 0.07 mm), a planar type A speaker member having a diaphragm portion and an edge portion was prepared. The obtained speaker member was subjected to the same evaluation as that in Example 39. The measurement results are shown in FIG.

  As is apparent from Example 39 and Comparative Example 4, the planar speaker member manufacturing method of the present invention is formed by using the same material (nonwoven fabric substrate) for the planar diaphragm portion and the edge portion. Low cost and excellent material efficiency. Furthermore, the planar diaphragm of Example 39 has a higher strength than the planar diaphragm of Comparative Example 4, and therefore can be made extremely thin (the thickness of the diaphragm of Comparative Example 4 is 3 mm). The thickness of the diaphragm of Example 39 is 0.2 mm, and a reduction in thickness of less than 1/10 is achieved). Further, as apparent from FIGS. 4 and 5, the flat speaker member of Example 39 (FIG. 4) has a much higher peak dip in the mid-high range than the flat speaker of the comparative example (FIG. 5). Has been reduced.

  As is clear from the description of Examples 1 to 39 above, the speaker member manufacturing method of the present invention uses the same material (laminated substrate, woven fabric, or nonwoven fabric substrate) for the diaphragm portion and the edge portion. Therefore, the material loss is small and the number of manufacturing steps can be reduced. Therefore, it is low cost and excellent in manufacturing efficiency.

  Further, as is clear from Tables 1 to 7, the speaker member of the present invention is excellent in strength even though the diaphragm part and the edge part are formed using the same material. The edge part is flexible and excellent in internal loss. Thus, according to the present invention, it is possible to form the diaphragm and the edge, which are required to have contradictory characteristics, using the same material, and it is possible to solve a problem that has not been solved for a long time.

  The speaker diaphragm of the present invention can be applied to any speaker (for example, a speaker for low sounds, medium sounds, and high sounds) and can be used as a full-band speaker.

It is a schematic diagram for demonstrating the manufacturing method of the member for speakers by the preferable embodiment of this invention. It is a schematic diagram for demonstrating the manufacturing method of the member for speakers by another embodiment of this invention. It is a figure for demonstrating the member for planar speakers by the preferable embodiment of this invention. FIG. 3A is a plan view thereof. 3B is a cross-sectional view of the speaker member of FIG. 3A along line BB. FIG. 3C is an enlarged view of a portion surrounded by an ellipse in FIG. 3B. 3D is a cross-sectional view taken along line CC of the speaker member in FIG. 3A. It is a graph which shows the relationship between a frequency and a sound pressure about the member for planar speakers by a preferable embodiment of this invention. It is a graph which shows the relationship between a frequency and a sound pressure about the conventional planar speaker.

Claims (14)

A loudspeaker member comprising a vibration rotation plate part and or falling edge of di moiety,
The diaphragm portion and the edge portion are composed of the same base material,
The substrate is a nonwoven fabric or a woven fabric,
The base material of the diaphragm portion is impregnated with a thermosetting resin,
The edge portion base material was impregnated with a thermosetting polyether urea elastomer.
Speakers member. The speaker member according to claim 1, wherein the base material is a nonwoven fabric made of thermoplastic elastomer fiber, para-type aramid fiber, meta-type aramid fiber, or polyarylate fiber, or an elastic woven fabric made of saturated polyester fiber. . The speaker member according to claim 2 , wherein the thermoplastic elastomer fiber is selected from a polyurethane elastomer fiber, a polyamide elastomer fiber, a polystyrene elastomer fiber, a polyester elastomer fiber, and an ethylene / vinyl acetate elastomer fiber. The speaker member according to claim 2 , wherein the saturated polyester fiber is a poly (trimethylene terephthalate) fiber.   The speaker member according to claim 1, wherein the thermosetting resin is an unsaturated polyester resin. The thermosetting resin, natural fibers, regenerated fibers or short fibers made of synthetic fibers or containing these mixtures further loudspeaker member according to any one of claims 1 5,. Thermoset polyether urea elastomer included in the edge portion, natural fibers or short fibers made of synthetic fibers or containing these mixtures further loudspeaker member according to any one of claims 1 to 6,. The diaphragm portion is cone type speaker member according to any one of claims 1 to 7. It said diaphragm portion is flat, loudspeaker component according to any one of claims 1 to 7. The speaker member according to claim 9 , wherein the diaphragm portion has a reinforcing portion. Forming a substrate made of a nonwoven fabric or a woven fabric ,
Step Ru impregnated with a thermosetting resin to the site to be the diaphragm portion of the substrate,
Curing the impregnated thermosetting resin to form a diaphragm portion and simultaneously forming an edge portion ;
Impregnating the edge portion with a thermosetting polyetherurea elastomer; and
Including the step of curing the thermosetting polyether urea elastomer.
A method for manufacturing a speaker member. The manufacturing method according to claim 11, wherein the base material is a nonwoven fabric made of thermoplastic elastomer fiber, para-type aramid fiber, meta-type aramid fiber, or polyarylate fiber, or an elastic woven fabric made of saturated polyester fiber. The manufacturing method according to claim 12, wherein the thermoplastic elastomer fiber is selected from a polyurethane elastomer fiber, a polyamide elastomer fiber, a polystyrene elastomer fiber, a polyester elastomer fiber, and an ethylene / vinyl acetate elastomer fiber. The production method according to claim 12, wherein the saturated polyester fiber is poly (trimethylene terephthalate) fiber.

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