JP2015192416A - Diaphragm for speaker device, and manufacturing method of diaphragm for speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaphragm for a speaker device which has a high Young's modulus, a high internal loss, and prolonged lifetime, and a manufacturing method of the diaphragm for the speaker device.SOLUTION: A first binder is provided over a first layer L1 and a second layer L2 and a second binder is spread over a third layer L3 and the second layer L2, such that the first layer L1 and the second layer L2 are surely fixed and that the second layer L2 and the third layer L3 can be surely fixed. Further, Young's moduli of the first layer L1 and the third layer L3 are improved, such that an internal loss is enlarged by using any suitable second fiber for the second layer L2. A Young's modulus of an entire diaphragm 1 for a speaker device is improved and the internal loss can be enlarged.

Description

  The present invention relates to a speaker device diaphragm and a method of manufacturing the speaker device diaphragm.

  In general, a speaker device diaphragm is required to have a high Young's modulus and a large internal loss, but it is difficult to satisfy these characteristics with a single material. Accordingly, a diaphragm for a speaker device having a multilayer structure using different materials has been proposed (see, for example, Patent Document 1). In the conventional diaphragm for a speaker device described in Patent Document 1, one layer is composed of a material having a high Young's modulus, and the other layer is composed of a material having a large internal loss. The internal loss increases as the rate increases.

JP 7-184295 A

  However, in the conventional diaphragm for a speaker device described in Patent Document 1, although it is necessary to bond each layer with an adhesive or the like, there is a possibility that the layers may be peeled off due to aging and the life is short. It was. Furthermore, when the difference in Young's modulus of each layer increases, it tends to vibrate with different amplitudes, and peeling is more likely to occur.

  Therefore, an object of the present invention is, for example, to provide a speaker device diaphragm that has a high Young's modulus and a large internal loss and can have a long lifetime, and a method for manufacturing the speaker device diaphragm.

  In order to solve the above-described problems and achieve the object, a diaphragm for a speaker device according to a first aspect of the present invention includes a first entangled body in which a first fiber and a first binder are entangled with each other, and the first entangled body. A first layer configured with a first filler dispersed in one entangled body, a second layer configured with a second entangled body intertwined with a second fiber, a third fiber and a first A third entangled body in which two binders are entangled with each other, and a third layer configured to include a second filler dispersed in the third entangled body are sequentially stacked. .

  On the other hand, the manufacturing method of the diaphragm for a speaker device according to the present invention described in claim 15 is a manufacturing method for manufacturing the diaphragm for the speaker device, and is dispersed in the first entangled body and the first entangled body. The mixture containing the first filler, the second entangled body, the third entangled body and the mixture containing the second filler dispersed in the third entangled body are sequentially stacked, and a pair of molds are used. It is characterized by being sandwiched from the thickness direction and heated and pressurized.

It is sectional drawing which shows the diaphragm for speaker apparatuses which concerns on the Example of embodiment of this invention. It is sectional drawing which shows the procedure which manufactures the said diaphragm for speaker apparatuses.

  Embodiments of the present invention will be described below. A speaker device diaphragm according to an embodiment of the present invention includes a first entangled body in which a first fiber and a first binder are entangled with each other, and a first filler dispersed in the first entangled body. A first layer configured, a second layer configured to have a second entangled body in which second fibers are entangled, a third entangled body in which a third fiber and a second binder are entangled with each other, and the A third layer configured to include a second filler dispersed in the third entangled body is sequentially stacked.

  When the first layer includes the first binder, the first binder can be intertwined with the second fibers of the second layer, and the first layer and the second layer can be reliably fixed. In addition, since the third layer includes the second binder, the second binder can be intertwined with the second fibers of the second layer, and the third layer and the second layer can be reliably fixed. In this way, the configuration in which the binder and the fiber are intertwined and the layers are fixed to each other is less likely to be peeled due to deterioration over time than the configuration using the adhesive, and the life can be extended.

  Furthermore, the Young's modulus can be increased by having the first layer and the third layer have fillers, and the internal loss can be increased by using an appropriate second fiber for the second layer. The overall Young's modulus can be increased and the internal loss can be increased. In addition, since the first layer and the third layer having a high Young's modulus are formed on both surfaces of the diaphragm, the entire diaphragm is compared with a two-layer structure in which a layer having a high Young's modulus is formed on one surface. The Young's modulus can be increased, and a fiber having a larger internal loss can be used in the second layer sandwiched therebetween.

  The second layer includes a first infiltration layer in which the first binder has infiltrated from the first layer, a second infiltration layer in which the second binder has infiltrated from the third layer, the first infiltration layer, and the It is preferable that an intermediate layer between the second osmotic layer is formed. Accordingly, the first layer and the second layer can be reliably fixed by the first osmotic layer, and the third layer and the second layer can be reliably fixed by the second osmotic layer.

  The sum of the thicknesses of the first and second osmotic layers is preferably 3% or more and 20% or less of the thickness of the second layer. Thereby, each layer can be securely fixed and the internal loss of the second layer can be secured. On the other hand, if the permeation layer is too thin, the force to fix the layers will be weak, and if the permeation layer is too thick, the Young's modulus of the permeation layer will be increased by the binder and the internal loss of the second layer will be reduced. .

  More preferably, the sum of the thicknesses of the first penetration layer and the second penetration layer is 10% or less of the thickness of the second layer. Thereby, the internal loss of the second layer can be ensured.

  It is preferable that the Young's modulus of the first penetration layer and the second penetration layer is higher than the Young's modulus of the intermediate layer. Thereby, the osmotic layer has a Young's modulus between the intermediate layer and the first layer or the third layer, and can function as a buffer. That is, even when the difference in Young's modulus is large and the amplitude is greatly different between the intermediate layer and the first and third layers, the difference in amplitude can be absorbed by the permeation layer.

  The Young's modulus of the second layer is preferably lower than the Young's modulus of the first layer and the third layer. Thereby, the internal loss of the second layer can be increased.

  It is preferable that the internal loss of the 1st penetration layer and the 2nd penetration layer is smaller than the internal loss of the said intermediate | middle layer. Thereby, the Young's modulus of the osmotic layer can be increased and function as a buffer.

  The internal loss of the second layer is preferably larger than the internal loss of the first layer and the third layer. Thereby, the Young's modulus of the first layer and the third layer can be increased, and the internal loss of the second layer can be increased.

  The second layer is preferably formed thicker than the first layer and the third layer. Thereby, the internal loss of the second layer can be sufficiently increased.

  It is preferable that the first fiber and the third fiber include a common fiber. Thereby, a member can be made common and cost can be reduced.

  It is preferable that the first fiber, the second fiber, and the third fiber include a common fiber. Thereby, a member can be made common and cost can be reduced.

  The first binder and the second binder preferably include a common binder. Thereby, a member can be made common and cost can be reduced. Furthermore, for example, when the first binder and the second binder are entangled with the second fiber by heating, they can be entangled to the same extent at substantially the same temperature, and the fixing force between the layers can be easily adjusted.

  It is preferable that the first filler and the second filler include a common filler. Thereby, a member can be made common and cost can be reduced. Furthermore, if the thicknesses of the first layer and the third layer are approximately the same, the Young's modulus can be made substantially the same, the difference in amplitude between the first layer and the third layer is reduced, and the entire diaphragm is made. Can be vibrated integrally, and separation between layers can be prevented more reliably.

  It is preferable that the first layer, the second layer, and the third layer that are sequentially stacked are sandwiched from a thickness direction by a pair of molds and are heated and pressed. Thereby, each binder can be melted and infiltrated into the second layer and entangled with the second fibers.

  A method for manufacturing a speaker device diaphragm according to an embodiment of the present invention is a method for manufacturing the speaker device diaphragm, wherein the first entangled body and the first entangled body dispersed in the first entangled body. A mixture including a filler, the second entangled body, the third entangled body, and a mixture including the second filler dispersed in the third entangled body are sequentially stacked, and from a thickness direction by a pair of molds. It is characterized by being sandwiched and heated and pressurized. Thereby, each binder can be melted and infiltrated into the second layer and entangled with the second fibers.

  Examples of the present invention will be specifically described below. FIG. 1 is a cross-sectional view showing a diaphragm 1 for a speaker device according to an embodiment of the present invention.

  The speaker device diaphragm 1 is formed in a cone shape as a whole and is configured to vibrate in the vertical direction in FIG. 1, and as shown in an enlarged view in FIG. 1B, the first layer L1 and the second layer L2 And the third layer L3 are stacked in order from the upper side. Further, the diaphragm 1 for the speaker device has an upper side in FIG. 1 as a front side and a lower side as a rear side, and an enclosure is provided on the rear side, for example.

  The first layer L1 includes a first entangled body 2 in which a first fiber (not shown) and a first binder (not shown) are entangled with each other, and a first filler 20 dispersed in the first entangled body 2. Has been.

  The second layer L2 includes a second entangled body 3 in which second fibers (not shown) are intertwined. Further, the second layer L2 includes a first infiltration layer L21 in which the first binder has infiltrated from the first layer L1, a second infiltration layer L23 in which a second binder described later from the third layer L3 has infiltrated, and a first infiltration. An intermediate layer L22 between the layer L21 and the second osmotic layer L23 is formed.

  In the first penetration layer L21, the first binder is entangled with the second fiber, and in the second penetration layer L22, the second binder is entangled with the second fiber. That is, the first binder is provided over the first layer L1 and the second layer L2, and the second binder is provided over the third layer L3 and the second layer L2.

  The third layer L3 includes a third entangled body 4 in which a third fiber (not shown) and a second binder (not shown) are entangled with each other, and a second filler 40 dispersed in the third entangled body 4. Has been.

  The first to third fibers are wood pulp fibers such as sulfite pulp and kraft pulp, non-wood pulp fibers such as bamboo and straw, and chemical fibers (synthetic fibers) composed of rayon, nylon, vinylon, polyester, acrylic, etc. ), Animal fibers such as silk and wool, plant fibers such as manila hemp and cotton, organic fibers composed of graphite, inorganic fibers composed of silicon carbide (glass fiber, carbon fiber, ceramic fiber), basalt, etc. A mineral fiber composed of Moreover, the 1st-3rd fiber may be the same, and may mutually differ.

  The first binder and the second binder may be any one that can be dispersed in the solvent for making the first fiber and the third fiber, and melted by heating and entangled with the second fiber. The second binder may be the same or different from each other. Examples of the binder include polyvinyl alcohol fibers having boron. Examples of the polyvinyl alcohol fiber having boron include a polyvinyl alcohol resin having boric acid and a polyvinyl alcohol resin having boron crosslinking.

  The polyvinyl alcohol-based resin having a boron cross-link is formed by adding a boric acid, borate, boronic acid or the like to polyvinyl alcohol to form a cross-linked structure with boron. The polyvinyl alcohol here is a polymer containing vinyl alcohol units of 10 mol% or more, preferably 30 mol% or more, more preferably 50 mol% or more, and usually a homopolymer or copolymer of vinyl ester or vinyl ether. Can be obtained by hydrolysis (saponification, alcoholysis, etc.). Here, vinyl acetate is a typical example of the vinyl ester, and vinyl formate, vinyl propionate, vinyl pivalate, vinyl valeate, vinyl caprate, vinyl benzoate and the like may be used. Examples of the vinyl ether include t-butyl vinyl ether and benzyl vinyl ether. Moreover, the polyvinyl alcohol here may contain the following monomer unit. These monomer units include olefins such as propylene, 1-butene and isobutene excluding ethylene; unsaturated acids such as acrylic acid, methacrylic acid, maleic acid, itaconic acid and maleic anhydride, or salts thereof or the number of carbon atoms. Mono- or dialkyl esters of 1 to 18; acrylamides such as acrylamide, N-alkyl acrylamide having 1 to 18 carbon atoms, N, N-dimethyl acrylamide, 2-acrylamidopropanesulfonic acid or its acid salt or quaternary salt thereof Methacrylamide, C1-C18 N-alkylmethacrylamide, N, N-dimethylmethacrylamide, 2-methacrylamideamidopropanesulfonic acid or its salt, methacrylamidepropyldimethylamine or its acid salt or its quaternary salt, etc. of Tacrylamides; N-vinylamides such as N-vinylpyrrolidone, N-vinylformamide, N-vinylacetamide; allyl compounds such as allyl acetate, allyl alcohol, and 8-hydroxy-1-octene; cyanides such as acrylonitrile and methacrylonitrile Vinyl ethers, vinyl ethers such as alkyl vinyl ethers having 1 to 18 carbon atoms and alkoxyalkyl vinyl ethers; vinyl fluorides such as vinyl chloride and vinylidene chloride; vinyl halides such as vinylidene fluoride; dimethylallyl alcohol and vinyl ketone .

  The first to third entangled bodies 2, 3 and 4 of the diaphragm 1 for the speaker device are not limited to the entangled body obtained by the papermaking method described later, but can be obtained by a method such as a needle punch method, a water jet method, or a flash spinning method. It may be an entangled body (eg, non-woven fabric).

  The 1st filler 20 and the 2nd filler 40 improve intensity | strength by being disperse | distributed to each layer (namely, raise a Young's modulus), Comprising: Mica is illustrated, The 1st filler 20 and the 2nd filler 40, May be the same or different.

  With the above configuration, the first binder is provided over the first layer L1 and the second layer L2, and the second binder is provided over the third layer L3 and the second layer L2, whereby the first layer L1. And the second layer L2 can be securely fixed, and the second layer L2 and the third layer L3 can be securely fixed. Furthermore, since the binder and the fiber are intertwined with each other, it is difficult to peel off due to deterioration over time and the life can be extended as compared with a configuration using an adhesive.

  Furthermore, since the Young's modulus of the first layer L1 and the third layer L3 is increased, the internal loss is increased by using an appropriate second fiber for the second layer L2, and the Young's of the diaphragm 1 for the speaker device as a whole is increased. The internal loss can be increased while increasing the rate. Further, since the first layer L1 and the third layer L3 having a high Young's modulus are formed on the front and back surfaces, compared with a two-layer structure in which a layer having a high Young's modulus is formed on one surface, it is for a speaker device. The Young's modulus of the entire diaphragm 1 can be increased, and second fibers having a larger internal loss can be used in the second layer L2 sandwiched therebetween.

  Next, a manufacturing method for manufacturing the speaker device diaphragm 1 by papermaking will be described. First, a first tank (not shown) in which the first fibers, the first binder, and the first filler 20 are dispersed in an appropriate solvent (for example, water), and a second tank (not shown) in which the second fibers are dispersed in an appropriate solvent. And a third tank (not shown) in which the third fiber, the second binder, and the second filler 40 are dispersed in an appropriate solvent (for example, water). In the case where the first layer L1 and the third layer L3 are made of the same member, only the first tank needs to be prepared.

  Next, a cone-shaped (convex) net M as shown in FIG. 2 is immersed in the second tank and sucked from the inner side (upper side in the figure), so that the second fibers are deposited on the outer side. The entangled body 3 is made. The net M is immersed in the third tank and sucked from the inside, and the third fiber, the second binder, and the second filler 40 are further deposited on the outside to form the third entangled body 4. As shown in FIG. 2A, the net M is placed on the lower mold D1 with the outside of the net M facing downward, and then the net M is removed.

  Further, another net (not shown) is immersed in the first tank and sucked from the inside, whereby the first fibers, the first binder, and the first filler 20 are deposited on the outside, and the first entangled body 2 is made. The first entangled body 2 is placed on the third entangled body 4 and the second entangled body 3 as shown in FIG. The first entangled body 2, the second entangled body 3, and the third entangled body 4, which are sequentially stacked in this way, are paired with a pair of molds (an upper mold D2 and a lower mold as shown in FIG. 2C). Dipped by D1), heated and pressurized. At this time, the heating temperature may be a temperature at which each binder can be melted.

  As described above, by heating and pressurizing with a pair of molds, the first to third layers L1 to L3 are formed, and by melting each binder, the second layer L2 is infiltrated, and the second layer L2 is made to penetrate. First penetration layer L21 and second penetration layer L22 are formed. At this time, holes D21 and D11 are formed in the upper mold D2 and the lower mold D1, and the solvent evaporated during heating can be discharged.

  Next, the weight% of each member, the thickness of each layer, and the characteristics will be specifically described. It shows to Tables 1-3 about Example 1, 2 and Comparative Example 1,2. Table 1 shows the weight% of each member when the total weight of each of the first layer, the second layer, and the third layer is 100.

[About the Young's modulus of the entire diaphragm]
In the diaphragm of Example 1, the sum of the thicknesses of the first and second osmotic layers is 15.7% of the thickness of the second layer, and the diaphragm of Example 2 is The sum of the thickness of the second osmosis layer and the thickness is 4.3% of the thickness of the second layer. In the diaphragm of Comparative Example 1, the sum of the thickness of the first osmosis layer, the second osmosis layer, and the thickness is the second layer. The Young's modulus of these diaphragms was a good value of 7.2 × 10 ⁹ N / mm ² or more. On the other hand, in the diaphragm of Comparative Example 2, the sum of the thicknesses of the first and second permeable layers is 2.9% of the thickness of the second layer, and the Young's modulus is 2.5 × 10 ⁹ N / The value was as low as mm ² . That is, as the permeation layer becomes thicker, the Young's modulus of the entire diaphragm can be improved, and when the permeation layer is thin, the Young's modulus decreases.

[Internal loss of the entire diaphragm]
The internal loss of the diaphragms of Examples 1 and 2 was a good value of 0.034 or more. On the other hand, the internal loss of the diaphragm of Comparative Example 1 was as low as 0.022, and the internal loss of the diaphragm of Comparative Example 2 was as low as 0.028. That is, when the permeation layer has an appropriate thickness, a good internal loss is obtained. When the permeation layer is thick as in Comparative Example 1, the internal loss of the entire diaphragm is reduced, as in Comparative Example 2. Even if the permeation layer is thin, the internal loss is reduced.

[Fixing force between layers]
In the diaphragms of Examples 1 and 2 and Comparative Example 1, a sufficient fixing force for fixing each layer was obtained, while in the diaphragm of Comparative Example 2, the fixing force was insufficient. That is, when the osmotic layer is thick, a sufficient fixing force can be obtained, and when the osmotic layer is thin, the fixing force is insufficient.

  In addition, this invention is not limited to the said Example, The other deformation | transformation etc. which can achieve the objective of this invention are included in this invention.

  For example, in the above embodiment, the second entangled body 3 and the first entangled body 2 are made by one net, and the third entangled body 4 is made by another net and overlapped. Three entangled bodies may be made, or entangled bodies made by three nets may be overlapped.

  Further, in Examples 1 and 2, the weight% of each member and the thickness of each layer are exemplified, but the material is appropriately selected so that the Young's modulus of the entire diaphragm for the speaker device is increased and the internal loss is increased. While being selected, the weight% of each member and the thickness of each layer may be set appropriately.

  In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations. Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

DESCRIPTION OF SYMBOLS 1 Speaker apparatus diaphragm 2 1st entangled body 3 2nd entangled body 4 3rd entangled body 20 1st filler 40 2nd filler L1 1st layer L2 2nd layer L3 3rd layer L21 1st penetration layer L22 intermediate | middle layer L23 Second penetration layer D1 Lower mold (a pair of molds)
D2 Upper mold (a pair of molds)

Claims (15)

A first entangled body in which the first fiber and the first binder are entangled with each other, and a first layer configured to include a first filler dispersed in the first entangled body;
A second layer configured with a second entangled body in which the second fibers are intertwined;
A third entangled body in which the third fiber and the second binder are entangled with each other, and a third layer configured to include the second filler dispersed in the third entangled body are sequentially stacked. A diaphragm for a speaker device.   The second layer includes a first infiltration layer in which the first binder has infiltrated from the first layer, a second infiltration layer in which the second binder has infiltrated from the third layer, the first infiltration layer, and the The diaphragm for a speaker device according to claim 1, wherein an intermediate layer between the second osmotic layer and the second osmotic layer is formed.   3. The speaker device according to claim 2, wherein the sum of the thicknesses of the first penetration layer and the second penetration layer is 3% or more and 20% or less of the thickness of the second layer. Diaphragm.   The diaphragm for a speaker device according to claim 3, wherein the sum of the thicknesses of the first and second penetration layers is 10% or less of the thickness of the second layer.   5. The diaphragm for a speaker device according to claim 2, wherein Young's modulus of the first penetration layer and the second penetration layer is higher than Young's modulus of the intermediate layer.   The diaphragm for a speaker device according to any one of claims 1 to 5, wherein Young's modulus of the second layer is lower than Young's modulus of the first layer and the third layer.   The diaphragm for a speaker device according to any one of claims 2 to 6, wherein an internal loss of the first penetration layer and the second penetration layer is smaller than an internal loss of the intermediate layer.   The diaphragm for a speaker device according to any one of claims 1 to 7, wherein an internal loss of the second layer is larger than an internal loss of the first layer and the third layer.   The diaphragm for a speaker device according to any one of claims 1 to 8, wherein the second layer is formed thicker than the first layer and the third layer.   The diaphragm for a speaker device according to any one of claims 1 to 9, wherein the first fiber and the third fiber include a common fiber.   The diaphragm for a speaker device according to claim 10, wherein the first fiber, the second fiber, and the third fiber include a common fiber.   The diaphragm for a speaker device according to claim 1, wherein the first binder and the second binder include a common binder.   The diaphragm for a speaker device according to any one of claims 1 to 12, wherein the first filler and the second filler include a common filler.   The first layer, the second layer, and the third layer that are sequentially stacked are sandwiched from a thickness direction by a pair of molds, and are heated and pressed to be molded. Item 14. The diaphragm for a speaker device according to any one of Items 1 to 13. A manufacturing method for manufacturing the speaker device diaphragm according to any one of claims 1 to 14,
The first entangled body and the mixture containing the first filler dispersed in the first entangled body, the second entangled body, the third entangled body, and the second filler dispersed in the third entangled body And a mixture containing the mixture, and a heating and pressurizing process by sandwiching the mixture in a thickness direction by a pair of molds.

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