JP2007312138A - Speaker diaphragm and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker diaphragm capable of producing distortionless and natural tones which can not be produced by existing materials without improving a manufacturing cost in a speaker for various acoustic output apparatuses. <P>SOLUTION: In the speaker for various acoustic output apparatuses, the speaker diaphragm 11 is composed of dissolving collagen peptide into water or the like to prepare a solution and coating or impregnating the solution with a resin group material such as a material composed of paper pulp, woven fabric or nonwoven fabric. To obtain the collagen peptide, collagen contained in the skins or bones of stock farm products, the skins, bones and scales of fishes, or the like is extracted and the extracted collagen is resolved by acids or enzymes and the resolved collagen is used. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker diaphragm used for speakers of various sound output devices and the like and a method for manufacturing the same.

  Conventionally, as a speaker diaphragm, the base material of the diaphragm is coated with a paint that is a composite of base resin and natural collagen fiber fine powder. There has been a proposal to make a speaker diaphragm balanced with loss (see, for example, Patent Document 1).

  Conventionally, paper made by deacetylating the surface of chitin fiber is made alone or together with different materials, molded into a predetermined shape, and then made into a paper using a synthetic resin hydrate having an epoxy group in the molecule as a binder. It has also been proposed to realize a speaker having good acoustic characteristics and sound quality and high reliability by using the diaphragm main body (see, for example, Patent Document 2).

  Furthermore, conventionally, ammonium carboxymethylcellulose has been used as a binder for chitin fiber-made speaker diaphragm material and chitin fiber, so that the dye can be fixed on the pulp without obstructing it. There has also been a proposal to improve physical properties without reducing aqueous properties (see, for example, Patent Document 3).

Japanese Utility Model Publication No. 7-20795 JP-A-5-183984 JP-A-6-165288

  Collagen is a substance that is insoluble in water at room temperature. To dissolve it, it must be dispersed in water for a long time and heated. In the proposal to combine the base resin and collagen fiber fine powder described above, collagen is dispersed in the base resin, but the influence of the characteristics of the base resin is very large, and this base resin is applied to the substrate surface. Even so, the characteristics of collagen are erased due to the influence of the base resin. Therefore, the acoustic characteristics cannot be improved with the diaphragm manufactured by this method. Further, when collagen is dispersed in water and heated, it becomes a soft jelly and is not suitable as a material for the diaphragm. Furthermore, even if collagen is directly mixed with paper pulp, it is difficult to stably produce a uniform material.

  On the other hand, in the proposal using chitin, the aim is to improve the rigidity of the diaphragm by chitin fibers and improve the tone of the diaphragm. Chitin fibers are extracted from the hard shell of crustaceans such as shrimps and crabs. The cost is high because of the material to be used.

  The present invention has been made to solve the above-described problems, and aims to obtain a natural tone by listening to a person by applying a collagen peptide, which is a main component of the human body, to a speaker diaphragm. It is a thing. By the way, chitin is not a human component. Collagen peptides can be easily and uniformly complexed with fibrous materials. That is, the problem to be solved by the present invention is to obtain a speaker diaphragm capable of obtaining a natural tone without distortion that cannot be obtained with existing materials without increasing the manufacturing cost, and a method for manufacturing the speaker diaphragm. To do.

  In order to solve the above-mentioned problems, a speaker diaphragm according to the present invention comprises a collagen peptide dissolved in water or the like to form a solution, and the solution is a paper pulp-based material, a fiber-based material such as a woven fabric or a non-woven fabric. Further, the composite material is coated or impregnated.

  Another speaker diaphragm according to the present invention is characterized in that a collagen peptide is dispersed in a liquid resin, and the liquid resin is applied to the surface of a substrate made of any one of fiber, resin and metal.

  Furthermore, in the method for manufacturing a speaker diaphragm according to the present invention, collagen peptide is first dissolved in water or the like to form a solution, and then the solution is applied to a material based on paper pulp, a fiber-based material such as woven fabric or nonwoven fabric. It is characterized by being composited by coating or impregnation.

  Furthermore, in the method for manufacturing a speaker diaphragm according to the present invention, the collagen peptide is first dispersed in a liquid resin, and then the liquid resin is applied to the surface of a substrate made of any one of fiber, resin and metal. Features.

  Embodiments of a speaker diaphragm and a manufacturing method thereof according to the present invention will be described in detail below. Note that the present invention is not limited to the embodiments. Below, the outline and characteristics of the speaker diaphragm of the present invention will be described as embodiments, and then examples relating to the speaker diaphragm will be described.

Embodiment 1 FIG.
The speaker diaphragm of the first embodiment is a composite in which collagen peptide is dissolved in water or the like to form a solution, and this solution is coated or impregnated with a paper pulp-based material, a woven fabric or a non-woven fabric. Made of things.

  More specifically, the speaker diaphragm is formed in the fiber by leaving the above-described fiber-based material coated with a collagen peptide solution on the surface at a temperature of 40 ° C. to 70 ° C. under a high temperature and high humidity of 80% or more. It is made of dispersed collagen peptide.

  As another example, the speaker diaphragm is manufactured by dispersing the collagen peptide in the fiber by immersing the above-described fiber-based material coated with a collagen peptide solution on an organic solvent.

  The above-mentioned collagen peptide is obtained by extracting collagen contained in livestock skin and bone or fish skin, bone, scale, etc., and decomposing with acid or enzyme, for example in the form of fine powder The water solubility is much higher than collagen, which is a polymer.

  A resin film may be further formed on the surface of the speaker diaphragm manufactured as described above by a technique such as laminating or painting.

  In the present embodiment, a low molecular collagen peptide obtained by decomposing collagen is used. Collagen is a substance that is insoluble in water at room temperature. To dissolve it, it must be dispersed in water for a long time and heated. On the other hand, the collagen peptide used in this embodiment has very high solubility in water as it is. Therefore, it can be impregnated or coated as it is by dissolving in water without using a base resin such as that used in the proposal of Patent Document 1 described above. In addition, since the collagen peptide has a small molecular weight, when it is impregnated into a fiber material, it easily enters uniformly into the fiber.

  As described above, in the speaker diaphragm of the present embodiment, the collagen peptide can be easily and uniformly combined with the fiber-based material, so that the manufacturing is easy and the cost is not improved. In addition, by applying a collagen peptide that is also a main component of the human body, a natural sound can be obtained by human hearing, and a natural tone without distortion that cannot be obtained with existing materials can be obtained.

Embodiment 2. FIG.
The speaker diaphragm according to the second embodiment is manufactured by dispersing a collagen peptide in a liquid resin and applying the liquid resin to the surface of a substrate made of any one of fiber, resin and metal. The collagen peptide used is the same as in the first embodiment.

  Also in the speaker diaphragm of the present embodiment, a resin film may be formed on the surface of the diaphragm manufactured as described above by a technique such as laminating or painting, as in the first embodiment.

  As described above, in the speaker diaphragm according to the present embodiment, in addition to obtaining substantially the same effect as that of the example, when the collagen peptide is mixed with the liquid resin, the dispersibility becomes better than the collagen fiber. The collagen peptide can be blended in the resin. Thereby, the influence of the base resin can be reduced.

Embodiments according to the present invention will be described below in detail with reference to the drawings.
[Example 1]
(Constitution)
FIG. 1 is a cross-sectional view of the speaker device of the embodiment. In FIG. 1, a speaker device 20 includes a vibration system including a cone-shaped diaphragm (diaphragm) 11, a voice coil 12 and a damper 13, and a magnetic circuit system including a yoke 14, a center pole 15, a magnet 16 and a top plate 17. Are housed in a frame 18 having a substantially truncated cone shape. The voice coil 12 further includes a cylindrical bobbin 21 and a winding 22 wound around the bobbin 21.

  A thin ring-shaped top plate 17 made of a magnetic material such as iron is overlaid on the front side of the ring-shaped magnet 16 (facing the sound radiation direction of the speaker device in front). The magnet 16 may be excited by a DC power source or may be a permanent magnet. On the other hand, a substantially disc-shaped yoke 14 made of a magnetic material such as iron is disposed on the back side of the magnet 16. A cylindrical center pole 15 integrated with the yoke 14 is disposed at the center of the yoke 14. A magnetic gap g is formed between the outer peripheral surface of the center pole 15 and the inner peripheral surface of the top plate 17.

  On the front side of the top plate 17, a substantially circular damper 13 and a substantially trumpet-shaped diaphragm 11 with a large diameter portion facing forward are disposed. A substantially cylindrical voice coil 12 is connected to the center hole of the diaphragm 11 so that the center axis of the diaphragm 11 coincides. The voice coil 12 can be moved back and forth in the axial direction by an elastic damper 13. The diaphragm 11 has a large diameter portion fixed to the frame 18 and a small diameter portion connected to the voice coil 12. The voice coil 12 is arranged such that the winding 22 is located at a predetermined position in the magnetic gap g.

  The diaphragm 11 is made by combining a collagen peptide and a fiber material. That is, the diaphragm 11 is combined by dissolving or dissolving collagen peptide in water or the like, and coating or impregnating the solution with a fiber-based material such as a paper pulp-based material, woven fabric or non-woven fabric. Yes.

(Operation)
The operation will be described. The magnetic circuit system including the yoke 14, the center pole 15, the magnet 16, and the top plate 17 forms a magnetic flux inside. This magnetic flux generates a uniform magnetic field perpendicular to the axial direction in the magnetic gap g. The winding 22 is disposed in the magnetic gap g and is in a magnetic field where magnetic flux is generated. When an audio current flows through the winding 22, amplitude vibrations occur in the axial direction due to the electromagnetic action of the audio current and the magnetic field. Then, this amplitude vibration is transmitted to the diaphragm 11, and the diaphragm 11 is shaken to emit sound. That is, the diaphragm 11 functions to change an electrical signal into sound.

(effect)
The diaphragm 11 is made by combining a collagen peptide and a fiber material. Collagen peptides increase the Young's modulus of corn paper when applied to fibrous materials in the manner described above. Collagen peptide of this example, extract the collagen contained in the skin and bones of livestock products such as cattle and pigs, or the skin of fish such as bonito, tuna, flounder, Thailand, bones, scales, It is obtained by degrading this collagen with acid or enzyme. The collagen peptide thus obtained is, for example, in the form of a fine powder, and is characterized by being much higher in water solubility than collagen, which is a polymer (see FIG. 2). And since a collagen peptide is a main constituent material of a living body, when applied to a diaphragm, a natural tone can be obtained without distortion, which is not found in existing materials.

(Production method)
The diaphragm 11 of the present embodiment is produced by the following manufacturing method, for example.
First, paper pulp-based corn paper is used as a fiber material. Next, a mixture of collagen peptide and water in a weight ratio of 1: 0.1 to 1:20 to obtain a viscous liquid is coated on corn paper. Thereafter, the corn paper coated with this collagen peptide is dried for 1 hour in an environment at a room temperature of 100 ° C., and then left for 1 hour in a high temperature and high humidity environment at a room temperature of 60 ° C. and a humidity of 95%. Then, it is dried by a technique such as hot press or hot air drying. The fiber-based material is spread between the fibers by moisture under high temperature and high humidity. Therefore, the low molecular weight collagen peptide is uniformly dispersed to the back of the fiber.

A diaphragm combined with a collagen peptide by the above method has a high Young's modulus.
The table of FIG. 3 is a table comparing the Young's modulus of the diaphragm manufactured by the above-described method with that of the untreated diaphragm. A kraft pulp corn paper mixed with collagen peptide and water at a weight ratio of 2: 1, and a weight ratio of 1: 1 is applied to the corn paper surface and vibrated by the above method. A board was produced. And the Young's modulus was compared with the untreated one. It can be seen that the Young's modulus is increased by the application of the collagen peptide.

The speaker diaphragm of the present embodiment can obtain the following effects.
(About sound quality)
By impregnating or coating the fibrous material with collagen peptide, the Young's modulus of the diaphragm can be improved, and an effect of improving sound quality by increasing rigidity can be obtained. Collagen peptides are extracted from various animals, but since they are the main constituent material of the human body, a natural tone without distortion that cannot be obtained with existing materials can be obtained by applying to a diaphragm.

(Environmental protection)
Collagen peptides can be obtained from commonly discarded materials such as livestock products, fish skin and bones. Thereby, waste can be used effectively and waste can be reduced. Moreover, most of the constituent materials of the diaphragm in which the base material made of paper pulp and the collagen peptide are combined are derived from natural materials, and the environment is not destroyed even when discarded.

  In addition, when using paper pulp-based corn paper as a base material as in this embodiment, the above-mentioned viscous liquid may be mixed with the material used for papermaking or water used for papermaking, After forming into the diaphragm of the mold, it may be impregnated or coated. In order to accelerate drying, the collagen peptide may be dissolved in 50 to 90% ethyl alcohol aqueous solution.

  Further, the diaphragm coated with the collagen peptide may be immersed in an organic solvent such as toluene instead of being left under high temperature and high humidity. By soaking in an organic solvent such as toluene, the collagen peptide is dispersed all the way into the fiber. Since the hydrophilic collagen peptide solution is repelled by the organic solvent and enters the fiber, it is possible to take such a method.

  Here, the viscosity of the collagen peptide solution increases when the solid content concentration in the aqueous solution exceeds 10% by weight. Therefore, it can be coated but not impregnated. The process of leaving in the high-temperature and high-humidity environment described above or immersing in a solvent is a device for dispersing the collagen peptide deep into the fiber.

  In this embodiment, the collagen peptide is dissolved in water and used as it is, but a resin or latex may be added to this solution. The Young's modulus can be easily changed by adding a resin or latex to the collagen peptide solution. Thereby, adjustment of sound quality can be performed easily.

  Furthermore, as in the above-described prior art, the base plate of the diaphragm is coated with a composite of a base resin and a collagen peptide (including diaphragms other than fiber systems (including injection diaphragms, metal diaphragms, etc.)) It is possible to apply a coating to form a coating film. When the collagen peptide is mixed with the base resin, the dispersibility becomes better than that of the collagen fiber, so that a large amount of the collagen peptide can be blended in the resin. Thereby, the influence of the base resin can be reduced.

  Further, a resin film may be further provided on the surface of the produced diaphragm by a technique such as lamination or painting. Collagen peptide is water-soluble and therefore has high hygroscopicity, but this can be improved by forming a resin film.

  The speaker diaphragm according to the present invention is suitable for a speaker diaphragm used for a speaker of various sound output devices and the like, and particularly suitable for a speaker diaphragm aiming at reproducing a natural tone.

It is a cross-sectional view which shows the speaker apparatus of an Example. It is explanatory drawing which shows a mode that collagen peptide is produced | generated by decomposing | disassembling collagen with an acid or an enzyme. It is a figure which shows the table | surface of the Young's modulus compared with the diaphragm which apply | coated collagen peptide, and the diaphragm which is not apply | coated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Diaphragm 12 Voice coil 13 Damper 14 Yoke 15 Center pole 16 Magnet 17 Top plate 18 Frame 20 Speaker apparatus 21 Bobbin 22 Winding g Magnetic gap

Claims (13)

A speaker diaphragm comprising: a collagen peptide dissolved in water or the like to form a solution, and the solution is coated or impregnated on a paper pulp-based material, a woven fabric or a non-woven fabric.   The fiber-based material coated with a collagen peptide solution on the surface is allowed to stand at a high temperature and high humidity of 80% or higher at a temperature of 40 ° C to 70 ° C to disperse the collagen peptide in the fiber. 2. The speaker diaphragm according to 1. The speaker diaphragm according to claim 1, wherein the fibrous material having a collagen peptide solution coated on the surface thereof is immersed in an organic solvent to disperse the collagen peptide in the fiber. A speaker diaphragm, wherein a collagen peptide is dispersed in a liquid resin, and the liquid resin is applied to a surface of a substrate made of any one of a fiber, a resin, and a metal. The collagen peptide is obtained by extracting collagen contained in the skin and bones of livestock products, or the skin, bones and scales of fish, and then decomposing it with an acid or enzyme. The speaker diaphragm according to any one of claims 1 to 4. The speaker diaphragm according to any one of claims 1 to 5, wherein a resin film formed by a technique such as laminating or painting is provided on the surface of the diaphragm. A speaker using the speaker diaphragm according to any one of claims 1 to 6.   First, a collagen peptide is dissolved in water to form a solution, and then the solution is coated or impregnated with a paper pulp-based material, a woven fabric or a non-woven fabric, and the speaker is combined. Manufacturing method of diaphragm. When the collagen peptide is combined with the fiber material, the fiber material coated with a collagen peptide solution on the surface is left in a high temperature and high humidity state at a temperature of 40 ° C. to 70 ° C. and a humidity of 80% or more. Collagen peptide is disperse | distributed to The manufacturing method of the speaker diaphragm of Claim 8 characterized by the above-mentioned. The collagen peptide is dispersed in the fiber by immersing the fiber material coated with a collagen peptide solution on the surface when the fiber peptide is combined with the collagen peptide in an organic solvent. The manufacturing method of the speaker diaphragm of description. First, a collagen peptide is dispersed in a liquid resin, and then the liquid resin is applied to the surface of a substrate made of any one of fiber, resin, and metal. The collagen peptide is obtained by extracting the collagen contained in the skin and bones of livestock products, or the skin, bones and scales of fish, and then decomposing the collagen with acid or enzyme. The method for manufacturing a speaker diaphragm according to any one of claims 8 to 11. The method for manufacturing a speaker diaphragm according to any one of claims 8 to 12, wherein a resin film is provided on a surface of the diaphragm base material combined with the collagen peptide by a technique such as lamination or painting.

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