JP2003116199A - Method for manufacturing diaphragm for speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for multiple paper making manufacturing which performs stable correlation bonding by reducing displacement and the quantity of industrial waste which comes out of a paper making process of a diaphragm for a speaker, and a material configuration from which new sound quality can be obtained. SOLUTION: A primary paper making net 2 is fixed in a paper filtering tank 1, a primary raw material 3 is thrown into the paper filtering tank 1, and a primary paper stock 4 is filtered up by draining water from the bottom part of the paper filtering tank 1. A paper making table 6 with a secondary paper making net 5 fixed is arranged, a secondary paper net 5 and the paper making table 6 are lowered to adsorb the primary paper stock 4 and then, the secondary paper making net 5 and the paper making table 6 are elevated. Afterwards, the secondary paper making net 5 and the paper making table 6 are lowered into secondary raw material 8 in a paper filtering tank 7 for a prescribed period of time, reverse paper filtering that drains water form the paper making table upward is performed, and a secondary paper stock 9 is overlapped on the primary paper stock 4 to be subjected to paper filtering. Finally, the primary paper stock 4 and the secondary paper stock 9 subjected to multiple paper making are transferred onto wire netting 12 fixed to a metallic mold 10 to perform heat press molding by overlapping a metallic mold 11 over the metallic mold 10 or non-press molding using warn wind. In the structure of this diaphragm, a suitable material for high Young's modulus is used on a front face side, and a suitable material for internal loss and flexural rigidity is used in a rear face side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a speaker diaphragm by performing a plurality of papermaking steps.

[0002]

2. Description of the Related Art A conventional manufacturing method will be described with reference to FIG.

In the raw material charging step (g), the raw material 14 is charged into the straining tank in which the papermaking net 13 is fixed to the straining tank 12,
In the papermaking process of (h), drain the stock from the bottom of the strainer tank and
5 is lifted up, the transfer process of (i) is performed by the transfer mold 16
The paper material 15 is adsorbed and moved on the sheet, and in the pressing step (j), 15 is transferred onto the die 17, and then the sheet is superposed on the die 18 for hot press forming. Alternatively, non-press molding is performed using warm air.

Generally, a papermaking raw material obtained by adding an additive such as a dye to a paper stock such as paper pulp, Japanese paper, and synthetic fiber is dispersed in water, and is made up in a papermaking net to make paper. The waste liquid generated in this step is Since it contains fibers and dyes that have leaked out from the mesh of the papermaking network, purification equipment is installed for processing.

On the other hand, wastes such as non-renewable fibers and dyes are accumulated in the purification equipment, and they are requested to be disposed of as industrial waste by a specialized company. However, there are only a limited number of dump sites due to the negative impact on the natural environment.

[0006]

The purification equipment shown above has a manager in order to strictly adhere to the wastewater standards, and is operated after receiving inspection, reporting, and guidance from the relevant administrative agency. Costs such as personnel costs, equipment costs, drug costs, and disposal costs are proportional to the production volume. There is nothing to gain from this cost. Therefore,
It is desired to reduce this processing cost.

However, if this waste liquid is reused in the papermaking process, the amount of water consumed and the amount of wastewater are reduced, but the fiber content and dyes in the waste liquid make the raw material concentration in the raw material tank unstable, and the papermaking vibration is caused. Variations occur in the sound quality and color of the boards.

Further, if the mesh of the papermaking net is made fine, the amount of fibers and dyes in the waste liquid will be reduced, but problems such as clogging of the papermaking net and unevenness of filtration will occur.

[0009] However, it is necessary to effectively use water resources and promote the reduction of industrial waste, which is an environmental load.

In addition, since the structure is generally a single structure shown in FIG.
It is desired to have a multi-layered diaphragm that can be divided into a material suitable for Young's modulus and a material suitable for internal loss.

[0011]

In order to solve the above-mentioned problems, the manufacturing method of the present invention divides the mass of the target diaphragm into two parts, the primary papermaking amount on the back side and the secondary papermaking amount on the front side. It is divided into the amount of papermaking after the next, and the stock made up in the first papermaking process is regarded as a part of the papermaking rope, and while maintaining the state of being adsorbed on the papermaking net of the second papermaking, the papermaking raw materials of the second and subsequent papermaking. After laying and squeezing together, heat press molding is performed using a mold. Alternatively, non-press molding is performed using warm air. That is, it is characterized in that the stock material of the primary papermaking functions as a filter paper while being layered.

Further, it is characterized in that a new sound quality design can be performed by using the above-mentioned manufacturing method by a diaphragm having a multiple structure in which a material having a large Young's modulus is applied to the front surface and a material having a large internal loss is applied to the back surface. .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

Claim 1 explains a method of manufacturing a diaphragm capable of reusing the waste liquid generated in the papermaking process and reducing the burden of the purification process with reference to process drawings 1.

In the raw material charging step (a), the primary papermaking net 2 is fixed to the straining tank 1, and the primary raw material 3 is charged into the straining tank.
In the primary paper making step (b), after draining water from the bottom of the straining tank to lift up the primary stock 4, the paper making table 6 to which the secondary paper making net 5 is fixed is placed on the upper side, and the transfer of (c) is performed. The process descends 5 and 6 to adsorb 4 and then ascends, maintaining this adsorbed state, and the secondary papermaking process (d) is carried out in the liquid of the secondary raw material 8 in the strainer tank 7. It descends and reversely strains the drainage direction above 6, and (e) rises while straining the secondary stock material 9 on top of it. Further, when there is a third paper making process or later, the steps similar to (d) and (e) are repeated to perform upside down filtering. next,
In the transfer step (f), the multiple paper stocks 4 and 9 are transferred onto the mold 10, and then the mold 11 is superposed and heated and press-molded. Alternatively, non-press molding is performed using warm air.

This papermaking process is performed according to the following specifications. (1) The amount of primary papermaking on the back side is 30% or more. (2) 70% or less of the papermaking amount after the secondary papermaking on the surface side. (3) The primary raw material is a material with good drainage. (4) The primary paper making net is 60 mesh or more. At least the following results are obtained when paper is made with this specification. (1) The waste liquid of the primary papermaking is reused as the primary raw material. (2) Waste liquid after secondary papermaking is reused or purified.

A second aspect of the present invention will be described with reference to the sectional view of FIG.

(A) is a diaphragm having a two-layer structure. The surface side 2a is made of a material having a large Young's modulus, and is a material obtained by adding additives such as dyes, sizing agents and paper strength agents to paper materials such as highly beaten paper pulp, fine fiber Japanese paper, ceramics, carbon and mica. It is effective for reproducing clear sound quality that is powerful, has good sound output. The back side 2b is made of a material having a large internal loss and bending rigidity, and is made by adding additives such as a sizing agent and a paper-strengthening agent to paper materials such as paper pulp, Japanese paper, and synthetic fiber, without disturbing the high-frequency characteristics. , It is effective for reproducing a wide range of sound quality in the low and middle frequencies.

(B) is a diaphragm having a three-layer structure in which one layer is added to the central portion. The central portion 3b is made of a material having a large internal loss, and is made by adding a dye, a sizing agent, a binder, etc. to a paper material such as pulp, synthetic fiber, or hollow fiber.
By adopting a three-layer structure on the back side 3c, it is effective for reproducing strong rigidity to withstand high output, powerful bass, and wide sound quality.

[0020]

EXAMPLES The following are examples using the manufacturing method of the present invention. First, when a diaphragm is made using a conventional manufacturing method, a diameter of paper making is 95 mm, NBKP pulp (beating degree 2
5), black dye 8%, raw material concentration 1 g / l, paper mesh 50 mesh, paper weight 2 g when dried, amount of waste water about 2 l,
The amount of waste such as fibers and dyes that have passed through the papermaking net is about 1
There is 30 mg, which is compared with the examples below.

(Example 1) 1. Primary papermaking: NBKP pulp (beating degree 18), size agent raw material concentration 1 g / l, papermaking mesh 80 mesh 2. Secondary papermaking: NBKP pulp (beating degree 35) black dye, sizing agent paper strength agent, raw material concentration 2 g / l, papermaking mesh 60 mesh. 3. Papermaking weight: 50% primary papermaking amount, 50% secondary papermaking amount. Primary waste liquid: The amount of waste water is about 1.0 liter, the amount of waste is 35 mg, which is reused for the primary raw material. Secondary waste liquid: The amount of waste water was about 0.5 l, and the amount of waste was 14 mg. As a result, it was confirmed that the amount of waste liquid was reduced by 75% and the amount of waste was reduced by 89.2%.

(Embodiment 2) 1. Primary papermaking: NBKP pulp (beating degree 18), sizing agent, paper strength agent, raw material concentration 0.5 g / l, papermaking mesh 80 mesh 2. Secondary papermaking: NBKP pulp (beating degree 35) 50% Rayon (5 mm length) 50% Sizing agent, raw material concentration 2 g / l 3. Tertiary paper: Manila hemp (beating degree 40), dye, sizing agent Concentration of raw material 5 g / l 4. 4. Paper making weight: primary paper making amount 30%, secondary paper making amount 40%, tertiary paper making amount 30%, when formed as described above, Primary waste liquid: The amount of waste water is about 1.2 liters, and the amount of waste is 21 mg. Reuse for primary raw material 6. Secondary waste liquid: The amount of waste water is about 0.4 l, the amount of waste is 11.2 mg 7. Tertiary waste liquid: The amount of waste water is about 0.12 liters, the amount of waste cannot be measured, the combined waste water of the secondary and tertiary is reused for the secondary raw material, and the rest is purified. As a result, it was confirmed that the amount of waste water was reduced by 94% and the amount of waste was reduced by 98%.

In the above embodiments, the material structure is not limited to this combination, but the amount of waste water and the amount of waste change in each case. In addition, the speaker using these two kinds of diaphragms gave strong sound with good sound dropout and bright sound quality. However, when new selection and construction of materials are attempted, new sound production can be expected.

[0024]

As described above, in the method for manufacturing the speaker diaphragm of the present invention, the paper making process is conventionally provided in one place.
When an upside-down papermaking step is added to this, the papermaking material initially made into a filter paper, and it becomes possible to prevent fibers and dyes leaking from the mesh. As a result, the amount of purification treatment is reduced by 75% or more and the amount of industrial waste is reduced by 89.2% or more by reusing wastewater, and purification treatment cost, water supply cost, dye cost (dyeing is performed on the surface side). Only), material cost (effective use) and environmental impact can be reduced. In addition, since Young's modulus and internal loss can be separated to select the material, it has the effect of speeding up sound quality design and broadening the range of new sound creation.

[Brief description of drawings]

Process drawing 1: It is sectional drawing showing the process of this invention. Process drawing 2: It is sectional drawing showing the conventional general process.

FIG. 1 is a cross-sectional view of a diaphragm according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional general diaphragm.

[Explanation of symbols]

(A), (g) raw material charging step (B), primary papermaking process (C), (i) transfer process (D), (e) Secondary papermaking process (F), (j) pressing process (H), papermaking process 1, straining tank 1 2, primary paper making net 3, primary raw material 4, primary paper fee 5, secondary paper web 6, 16, transfer type 7. Straining tank 2 8. Secondary raw material 9, secondary stock 10, 17, concave mold 11, 18, convex mold 12, straining tank 13, paper making net 14, raw material 15, paper fee (A), two-layer diaphragm (B), three-layer diaphragm (C), single structure diaphragm 1a, 2a, 2b, 3a, 3b, 3c, cross section of diaphragm

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[Procedure amendment]

[Submission date] December 19, 2001 (2001.12.
19)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a process of the present invention.

FIG. 2 is a cross-sectional view showing a conventional general process.

FIG. 3 is a cross-sectional view of a diaphragm according to an embodiment of the present invention.

FIG. 4 is a sectional view of a conventional general diaphragm.

[Explanation of symbols] (A), (g) raw material charging step (B), primary papermaking process (C), (i) transfer process (D), (e) Secondary papermaking process (F), (j) pressing process (H), papermaking process 1, straining tank 1 2, primary paper making net 3, primary raw material 4, primary paper fee 5, secondary paper web 6, 16, transfer type 7. Straining tank 2 8. Secondary raw material 9, secondary stock 10, 17, concave mold 11, 18, convex mold 12, straining tank 13, paper making net 14, raw material 15, paper fee (A), two-layer diaphragm (B), three-layer diaphragm (C), single structure diaphragm 1a, 2a, 2b, 3a, 3b, 3c, cross section of diaphragm

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Procedure amendment]

[Submission date] December 21, 2001 (2001.12.
21)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art A conventional manufacturing method will be described with reference to FIG.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Further, since the structure is generally a single structure as shown in FIG. 4C, which is a cross section 1a, there is a limit to the structure of the sound.
It is desired to have a multi-layered diaphragm that can be divided into a material suitable for Young's modulus and a material suitable for internal loss.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

Claim 1 explains a method of manufacturing a diaphragm capable of reusing the waste liquid generated in the papermaking process and reducing the burden of the cleaning process with reference to FIG.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

A second aspect of the present invention will be described with reference to a sectional view of FIG. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 3, 2002 (2002.10.
3)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a speaker diaphragm used in an audio device.

[0002]

2. Description of the Related Art A method of manufacturing a speaker diaphragm will be described with reference to FIG.

[0003] In a papermaking method generally used in many cases, a papermaking net 14 having a predetermined shape is arranged at the bottom of the (g) making tank 13, and a raw material 15 is put into this tank, and 14
The paper making method is used in which the paper material 16 is drained downwards and the paper material 16 is strained. The paper making 16 is adsorbed to the transfer mold 17 of (i) and taken out from 14 and then dried and formed. Papermaking of one structure is performed. In the case of press molding, the subsequent steps are the concave mold 18 and the convex mold 1 with the wire net 20 of (j) attached.
9 is heated and placed at a predetermined temperature, 16 is transferred onto 20 and superposed with 19, and press-molded for a predetermined time.
Alternatively, in the case of non-press molding, the method of adsorbing and maintaining 16 on the transfer mold 17 of (i), blowing hot air to it and performing dry molding is used.

In addition, the waste liquid discharged from this papermaking process contains impurities such as fibers, dyes and chemicals leaking from the mesh of the papermaking net, and the quality of this water exceeds the drainage standard set by the government. , Can not be dumped in general drains. That is, the waste liquid discharged from the diaphragm manufacturing process is obliged to be purified.

At this time, the treated water is drained to the sewer, but the impurities such as fibers, dyes and chemicals are individually stored as industrial waste and then disposed of in appropriate amounts and then disposed of by a designated specialist. ing.

[0006]

The purification treatment facility shown above has a manager in order to strictly adhere to the wastewater standards.
It operates after receiving inspections, reports, and guidance from the relevant administrative agency, but it is clear that regulations related to the dumping of industrial waste will be tightened due to global environmental issues, and the cost for purification treatment in the future. You cannot avoid the increase of. Furthermore, the dumping of this industrial waste has a problem that it directly pollutes the soil and exerts a load on the natural environment. To solve this,
It is desirable not to generate waste and waste water from the manufacturing process.

However, when the waste liquid is reused as a papermaking raw material, the water consumption amount and the waste water amount are reduced, but there is a drawback that the sound quality, weight, and appearance of the diaphragm vary due to the impurities in the waste liquid. is there.

[0008] On the other hand, when the mesh of the paper making net is made fine, the influence of impurities is reduced, but uneven production occurs due to clogging, and stable production cannot be performed.

However, since it is difficult to reuse the waste liquid in the conventional manufacturing method, there is a demand for a new manufacturing method that solves this problem.

Further, since the conventional diaphragm has a single structure as shown in the section 1a of FIG. 5, the selection range of the material is narrow and it is not easy to make the desired sound. Therefore, select a material that is characterized by acoustic properties such as Young's modulus, internal loss, and bending rigidity.
The appearance of a multi-layered diaphragm that separates this is desired.

[0011]

In order to solve the above-mentioned problems, the manufacturing method of the present invention divides the mass of the target diaphragm so that the primary paper on the back side and the secondary paper on the front side are formed. The papermaking raw materials are separated and the paper stock made in the primary papermaking process is regarded as a part of the papermaking net, and a multi-structured vibration plate is manufactured using the papermaking process in which the secondary and subsequent papermaking raw materials are made. It has a feature to do. In other words, the steps after the secondary papermaking are papermaking methods in which, when the papermaking raw material tries to pass through the stock for the primary papermaking, the layering progresses so as to fill the gaps between the fibers.

Further, since the raw material of the primary papermaking is located on the back surface of the diaphragm, it does not affect the appearance of the speaker and usually does not require dyeing.

The diaphragm using the above-mentioned manufacturing method has various structures because it has a multi-layered structure in which a material suitable for high Young's modulus is provided on the front surface side and a material suitable for internal loss and bending rigidity is provided on the rear surface side. It has the feature that the material composition can be selected.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

A first aspect of the present invention will be described with reference to FIG. 1, which shows a method of manufacturing a diaphragm, which can reduce the burden of reusing and purifying the waste liquid discharged from the papermaking process.

In the raw material charging step (a), the primary papermaking net 2 is fixed to the straining tank 1, and the primary raw material 3 is charged into the straining tank.
(B) In the primary paper making process, the primary stock 4 is drained by draining from the bottom of the straining tank. The paper making table 6 to which the secondary paper making net 5 is fixed is arranged on the upper side, and in the transfer step of (c), 5 and 6 are lowered to adsorb 4 and then rise, and this adsorbed state is as shown in (e). Hold until the end of the process. In the secondary paper making step (d), a predetermined time is dropped into the liquid of the secondary raw material 8 in the straining tank 7 and drained above 6 to perform reverse straining.
(E) shows that the secondary stock 9 has been piled up on the sheet 4 and has been lifted. Further, if there is a third paper making or later, the steps similar to the other steps (d) and (e) are repeated to perform upside down filtering. In (f), the multiple papermaking materials 4 and 9 are transferred onto the metal net 12 fixed to the metal mold 10, and the paper material is superposed on the metal mold 11 and subjected to hot press molding. Alternatively, non-press molding is performed using warm air.

This papermaking process is performed according to the following specifications. (1) The mass of the primary paper making on the back side is 30% or more. (2) The mass after the secondary paper making on the surface side is 70% or less. When paper is made with this specification, at least the following results are obtained. (1) The waste liquid of the primary papermaking can be reused for the primary raw material. (2) The waste liquid after the secondary papermaking can be reused for the primary or secondary raw material.

A second aspect of the present invention will be described with reference to the cross-sectional views of FIGS. 3 and 4 showing the construction of a diaphragm which is made by multiple papermaking using the manufacturing method of the first aspect.

FIG. 3 shows a two-layer structure diaphragm. The surface side cross section 2a is made of a material characterized by a high Young's modulus, and is made of paper pulp, Japanese paper, ceramics, carbon, mica, etc., to which dyes, sizing agents, paper strength agents, etc. have been added. It is effective for reproducing clear and clear sound quality. The back surface side cross section 2b is made of a material having a characteristic of internal loss and bending rigidity, and is a material obtained by adding an additive such as a sizing agent and a paper strengthening agent to a paper material such as paper pulp, Japanese paper, and synthetic fiber. It is effective for reproducing sound quality with little disturbance and a wide range of low and mid frequencies.

FIG. 4 shows a three-layer structure diaphragm in which the central portion is added to FIG. The central cross-section 3b is made of a material having a characteristic of internal loss, and is made by adding a sizing agent, a paper strength agent, etc. to a stock material such as pulp, synthetic fiber, and hollow fiber. With a three-layer structure, it has high rigidity to withstand high output, and is effective for reproducing powerful low-pitched sound with a sense of spaciousness.

[0021]

EXAMPLES The following are examples using the manufacturing method of the present invention. The effect of the present invention was obtained by selecting a typical 12 cm caliber free edge type diaphragm, comparing the amount of waste water and the amount of impurities with the same paper making diameter, paper making weight, mold and edge. The specifications of the conventional manufacturing method are: papermaking diameter 95 mm, papermaking weight 2 g, raw material concentration 1 g / l, papermaking net 50 mesh, KP pulp (beating degree 25), and black dye. The papermaking waste liquid had a wastewater amount of 2 l and an impurity amount of 130 mg.

(Example 1) 1. Primary papermaking: NBKP pulp (beating degree 18), sizing agent, raw material concentration 1 g / l, papermaking mesh 80 mesh, 1. Secondary papermaking: NBKP pulp (beating degree 35), sizing agent, black dye, paper strength agent, raw material concentration 2 g / l, papermaking mesh 60 mesh, 2. 3. Paper making weight: 1.0 g of primary paper making, 1.0 g of secondary paper making, 2.0 g in total, 4. Primary waste liquid: the amount of waste water is about 1.0 l, the amount of impurities is 35 mg. Secondary waste liquid: The amount of waste water is about 0.5 l, and the amount of impurities is 14 mg. As a result, the primary waste liquid has no dye and little chemicals, so it is reused for the primary raw material, and the secondary waste liquid is purified. With this effect, the amount of waste liquid was reduced by 75% and the amount of impurities was reduced by 89.2%.

(Example 2) 1. Primary papermaking: NBKP pulp (beating degree 18), sizing agent, paper strength agent, raw material concentration 0.5 g / l, papermaking mesh 80 mesh, 1. Secondary papermaking: NBKP pulp (beating degree 35) 50%, sizing agent, rayon (5 mm length) 50%, raw material concentration 2 g / l, papermaking mesh 60 mesh, 3. 3. Third paper: Manila hemp (beating degree 40), black dye, sizing agent, raw material concentration 5 g / l, 4. 4. Papermaking weight: primary papermaking amount 0.6 g, secondary papermaking amount 0.8 g, tertiary papermaking amount 0.6 g, total 2.0 g, Primary waste liquid: the amount of waste water is about 1.2 l, the amount of impurities is 21 mg, 6. Secondary waste liquid: the amount of waste water is about 0.4 l, the amount of impurities is 11.2 mg, 7. Tertiary waste liquid: The amount of waste water is about 0.12 l (mixed with the secondary waste liquid). As a result, the primary waste liquid is reused for the primary raw material because it has no dye and few chemicals, and is a mixed waste liquid of the secondary waste liquid and the tertiary waste liquid. Since the amount of impurities is small, it is reused for secondary raw materials,
The remaining 0.12 l is purified. As a result, the amount of wastewater was reduced by 94% and the amount of impurities by 97.4%.

Conventional diaphragm and (Example 1) (Example 2)
Comparing the sound quality of the speaker configured by using the diaphragm, the embodiment is characterized by strong sound quality, good sound dropout, and bright sound quality.

[0025]

As described above, according to the method for producing a diaphragm of the present invention, since the stock material firstly made in the multiple papermaking serves as a filter paper, impurities in the waste liquid after the second papermaking are reduced, The raw material for the primary paper making on the back side does not need to be dyed, and thus the waste liquid can be reused. From this, the amount of purified wastewater can be reduced by 75% or more, and the amount of industrial waste can be reduced by 89% or more, reducing costs such as purification treatment costs, water supply costs, dye costs, material costs, and environmental burden. it can. It is also possible to propose a new sound quality structure by selecting a material with a high Young's modulus for the front surface and a material with a suitable internal loss and bending rigidity for the back surface.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a process of the present invention.

FIG. 2 is a cross-sectional view showing a conventional general process.

FIG. 3 is a cross-sectional view of a two-layer structure diaphragm using the present invention.

FIG. 4 is a sectional view of a three-layer structure diaphragm using the present invention.

FIG. 5 is a cross-sectional view of a diaphragm using a conventional manufacturing method.

[Explanation of symbols] (A), (g) raw material charging step (B), primary papermaking process (C), (i) transfer process (D), (e) Secondary papermaking process (F), (j) pressing process (H), papermaking process 1, straining tank 1 2, primary paper making net 3, primary raw material 4, primary paper fee 5, secondary paper web 6, paper table 7. Straining tank 2 8. Secondary raw material 9, secondary stock 10, 18, concave mold 11, 19, convex mold 12, 20, wire mesh 13, straining tank 14, paper mesh 15, raw material 16, paper fee 17, transfer type 1a, cross section of conventional diaphragm 2a, cross section of the front side of the two-layer structure diaphragm 2b, cross section of the back side of the two-layer structure diaphragm 3a, cross-section on the surface side of the three-layer structure diaphragm 3b, cross section of the central part of the three-layer structure diaphragm 3c, cross section of the back side of the three-layer structure diaphragm

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

Claims (2)

[Claims] 1. A method comprising at least a plurality of paper making steps,
Using the stock made in the first paper making process, while keeping the state of being absorbed by the second paper making net, place it in the liquid of the raw material in the paper making process after the second paper making, draining it upward and straining. A method of manufacturing a diaphragm for a speaker, which is characterized in that the method of raising is used to perform multiple paper making by superimposing the paper stock of the first paper making. 2. A speaker diaphragm having a multiple structure in which two or more layers are stacked by using the manufacturing method according to claim 1.