JP2008199184A - Manufacturing method of electroacoustic transducer diaphragm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an electroacoustic transducer diaphragm using a wooden sheet, the manufacturing method of electroacoustic transducer diaphragm being characterized in that the wooden sheet never breaks in a metal die during heat press forming, burning attachment of lubricant on the metal die during the heat press forming does not occur, and also deformation such as warpage hardly occurs. <P>SOLUTION: The manufacturing method of the electroacoustic transducer diaphragm includes: a stage 100 of forming a stuck sheet 1 by sticking a sheet member 4 made of a different material from wooden sheets 2a and 2b on one surface of a member 200 formed by layering a plurality of wooden sheets 2a and 2b of 0.01 to 3 mm in thickness; a stage 101 of dipping the stuck sheet 1 in a solution 5 containing a 0.01 to 1 wt.% penetrant or a solution 5 containing a 0.01 to 1 wt.% penetrant and a 0.1 to 20 wt.% lubricant; and a stage 102 of molding the dipped stuck sheet 1 in a predetermined shape as a diaphragm by heat press forming. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a diaphragm for an electroacoustic transducer.

  Loudspeaker diaphragms using wooden sheets can reproduce more natural sounds than loudspeaker diaphragms using paper pulp or plastic, but they break when press-molded into diaphragm shapes. There is a technical problem that it is easy, and a manufacturing method disclosed in Patent Document 1 has been proposed as a solution to this problem.

In this manufacturing method, a laminated sheet obtained by laminating a nonwoven fabric or paper on one surface of a single wooden sheet is immersed in water containing a lubricant and then press-heat-molded. By impregnating the sheet, the wooden sheet is made smooth and supple, making it difficult to break during press heat forming.
JP-A-10-304492

  However, in the above conventional manufacturing method, the sliding and elongation of the wooden sheet at the time of press heat forming cannot be said to be sufficient. Therefore, the wooden sheet may still break in the mold at the time of press heat forming.

  In addition, the lubricant may ooze out on the surface of the wooden sheet during press heat forming and seize on the mold, and the wooden sheet may be difficult to peel off from the mold. In addition, the lubricant baked on the mold may be partially peeled off to become small pieces and adhere to the diaphragm-shaped molded product, which may impair the appearance.

  Furthermore, the work of peeling off the seizure of the lubricant from the speaker diaphragm is required, so that productivity may be reduced. Furthermore, since it is composed of a single wooden sheet, deformation such as warpage is likely to occur.

  An object of the present invention is to provide a method for manufacturing a diaphragm for an electroacoustic transducer that can eliminate the above-described problems.

  In order to achieve the above object, a method for manufacturing a diaphragm for an electroacoustic transducer according to the present invention includes a sheet member made of a material different from a wooden sheet on at least one surface of a member obtained by stacking and bonding a plurality of wooden sheets. A bonded sheet formed by sticking, comprising an aqueous solution containing at least a penetrant among a penetrating agent and a wetting agent as a surfactant, and a bonded sheet formed into a predetermined shape by press heating deformation, It is characterized by manufacturing a diaphragm for an electroacoustic transducer formed into a predetermined shape as a diaphragm, and the laminated sheet contains an aqueous solution compound containing a penetrant, or a penetrant and a swelling agent. An aqueous compound remains.

  The penetrant used in the present invention includes, for example, lauryl sulfate ester salt, dialkylsulfosuccinate ester salt, fatty acid amide sulfonate, alkylnaphthalene sulfonate, alkylphenol ethylene oxide adduct, medium to higher alcohol ethylene oxide adduct, It shall contain one or more butyl oleate and others.

  The wetting agent is, for example, monohydric alcohol, dihydric alcohol, trihydric alcohol, ethylene glycols, butyl glycols, propyl glycols, saccharides, mucopolysaccharides, sugar alcohols, water-soluble various proteins, etc. Including at least two.

  In addition, about the use density | concentration of a penetrating agent, although the penetration effect with respect to wood is acquired at 0.001 weight% or more, it is 0.1 weight% or more that the penetration effect is acquired stably. In addition, since the penetrant remains in the wooden sheet and affects the durability of the diaphragm, it is desirable to keep the penetrant concentration to the minimum necessary amount. Therefore, the use concentration of the penetrant can be preferably 1% by weight or less.

  Further, the use concentration of the wetting agent is 0.01% by weight or more, and the penetration effect on wood can be obtained, but the stable penetration effect is obtained by 0.1% by weight or more. Further, it is desirable to keep the use concentration of the wetting agent to the minimum necessary amount because the wetting agent remains in the wooden sheet and affects the durability of the diaphragm. Accordingly, the use concentration of the wetting agent is preferably 20% by weight or less, and more preferably 10% by weight or less for a wooden sheet having a thickness of 0.01 mm to 1 mm.

As the “sheet member made of a material different from the wooden sheet”, for example, non-woven fabric, paper, woven fabric, or the like can be used. When the electroacoustic transducer diaphragm according to the present invention is applied to an earphone, a headphone or the like, a film such as a soft plastic film may be used. When applied to a speaker, in addition to a soft plastic film, sponge, cardboard, glass fiber, or the like may be used. When it is necessary to reduce the thickness of the wooden sheet alone, it is preferable to select a film or paper as the “sheet member made of a material different from that of the wooden sheet”. In other cases, the other materials described above are selected. Is preferred.

  In addition, when a longitudinal and horizontal uniform strength is required as a bonding sheet, for example, a woven fabric such as a biaxial woven fabric or a four-axial woven fabric may be bonded to the wooden sheet. The woven fabric has an advantage that a diaphragm having a light weight and high rigidity can be easily obtained because it is easy to adjust a required portion or an axial strength to a required size.

  The thickness of the wooden sheet alone is preferably in the range of 0.005 mm to 3 mm that can be used as a wooden sheet, but in particular 0.005 mm to 0.05 mm for small diaphragms for earphones and headphones. Less than is a preferable range. Usually, the preferred range for the diaphragm is 0.01 mm to 0.3 mm, which can be easily produced by wig peeling or slicing. On the other hand, for a large bass diaphragm, 1 mm to 2 mm, or more than 2 mm to 3 mm is a preferable range.

  In addition, when a laminated sheet is formed with a plurality of wooden sheets, the adhesive layer between the wooden sheets is distorted between the wooden sheets at the time of press molding and becomes brittle, or the wooden sheet is cracked. There is. Considering the effect of suppressing distortion, cracking, etc., the material of the adhesive layer that bonds between wooden sheets is a slow-curing flexible adhesive that can follow the deformation of the press during press molding, for example, water-soluble It is preferable to use a system adhesive, an emulsion adhesive, or the like.

  In addition, when the bonded sheet containing the aqueous solution is formed into a predetermined shape, the temporary sheet is temporarily formed by primary press thermoforming, and then a thermosetting resin is included and formed into a predetermined shape by secondary press thermoforming. You may make it do.

  According to the present invention, in addition to the water containing the penetrating agent and the wetting agent entering the wooden sheet to give the wooden sheet elasticity, the penetrating agent and the wetting agent have an effect of giving more water to the wooden sheet. By exhibiting it, it is possible to realize a large elongation of the wooden sheet, so that it becomes difficult for the wooden sheet to break in the mold at the time of press heat forming, and the yield rate is improved. The weight ratio of water, penetrant, and wetting agent is appropriately adjusted according to the degree of stretchability and moisture absorption of the wooden sheet. Since the wooden sheet is stretched substantially uniformly in the mold during press thermoforming, a diaphragm for an electroacoustic transducer with less variation in thickness can be obtained, so that the electrical power of speakers, earphones, headphones, etc. using this can be obtained. The acoustic characteristics of the acoustic transducer are improved.

  In addition, by forming a laminated sheet with a plurality of wooden sheets, deformation such as warpage is less likely to occur, and there is little variation in thickness over the whole, and an electroacoustic transducer diaphragm excellent in strength can be obtained. The acoustic characteristics of electroacoustic transducers such as speakers, earphones, and headphones using the same are also improved.

  In addition, when a sheet member made of a material different from that of a wooden sheet is press-heat-molded so as to be in contact with the die in a press-heat-molding die, it is easy to mold and productivity is improved. The manufacturing cost is reduced.

  Furthermore, for example, as a wooden sheet, two types of wooden sheets having different thicknesses are prepared in advance, and two wooden sheets having the same thickness or different thicknesses are selected from the prepared wooden sheets and bonded together. Thus, three types of electroacoustic transducer diaphragms having different thicknesses can be manufactured. As described above, since a plurality of types of diaphragms for electroacoustic transducers having different thicknesses can be manufactured by changing the combination of thicknesses of two wooden sheets to form a bonded sheet, manufacturing a diaphragm for electroacoustic transducers The degree of freedom of design at the time is increased, and the productivity is improved.

  In addition, both the penetrant and the wetting agent do not cause seizure in the press-molding mold, so that the releasability of the workpiece from the mold, the workpiece dirt, the mold stain, etc. It does not occur. Therefore, the yield rate is improved, and the work of peeling the seizure from the diaphragm or the mold is unnecessary, so that productivity is improved and manufacturing cost is reduced.

  Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a flowchart showing a method of manufacturing an electroacoustic transducer diaphragm according to the present invention, and FIG. 2 is an explanatory diagram of the first embodiment.

  First, in the bonded sheet forming step 100 shown in FIG. 1, as shown in FIG. 2A, a member formed by bonding two wooden sheets 2a and 2b having a thickness of about 0.25 mm with an adhesive layer 3a. 200 is prepared, and a sheet member (nonwoven fabric) 4 other than a wooden sheet having a thickness of approximately 0.05 mm is attached to one surface of the member 200 via an adhesive layer 3b, and a thickness of approximately 0.60 mm is provided. A bonded sheet 1 is formed.

  In addition, as the wooden sheets 2a and 2b, hardwood timber or the like can be used, and in particular, in consideration of strength against defects such as cracks and acoustic propagation characteristics, straw wood, oak wood, and the like are preferable. As the adhesive layers 3a and 3b, a water-soluble adhesive, an emulsion adhesive, or the like can be used. Considering the adhesion to the wooden sheets 2a and 2b and the acoustic propagation characteristics, for example, an emulsion adhesive is suitable as the adhesive layers 3a and 3b. Further, considering that the sheet member (nonwoven fabric) 4 other than the wooden sheet is easier to extend than the wooden sheets 2a and 2b, the adhesive layer 3a used between the two wooden sheets 2a and 2b is an adhesive layer. It is desirable to use a flexible adhesive material that is longer (followable) than 3b.

  Next, in the dipping step 101 shown in FIG. 1, an aqueous solution 5 containing 0.05% by weight of sodium butylnaphthalene sulfonate is prepared, and the laminated sheet 1 is cut into an appropriate size, as shown in FIG. 2 (b). Immerse in the aqueous solution 5.

  Next, in the primary press thermoforming step 102 shown in FIG. 1, the bonded sheet 1 that has become supple by immersion is immersed in a mold 6 that has been heated to 100 ° C. or higher in advance as shown in FIG. , Press-molding. The mold 6 is a male and female type consisting of a male mold 7 and a female mold 8 formed in a predetermined shape, and has heaters 9 and 10.

  In addition to the butyl naphthalene sulfonic acid soda entering the wooden sheets 2a and 2b and imparting elasticity to the wooden sheets 2a and 2b, the butyl naphthalene sulfonic acid soda has an effect of giving more moisture to the wooden sheets 2a and 2b. By exhibiting this, it is possible to achieve a large elongation of the wooden sheets 2a, 2b, so that the wooden sheets 2a, 2b are unlikely to break in the mold 6 during press heat forming.

  Further, since no lubricant is contained in the aqueous solution 5, no deposits are generated on the mold 6 during pressing, and the bonded sheet 1 is not baked on the mold 6, and there are defects such as cracks. A good molded product is obtained.

  Next, in the thermosetting resin impregnation step 103 shown in FIG. 1, the molded product 12 obtained in the primary press thermoforming step 102 is immersed in the thermosetting resin solution 11 as shown in FIG. . At the same time, vibration by the ultrasonic vibrator 13 is applied to the thermosetting resin solution 11 and immersed until the thermosetting resin sufficiently penetrates into the molded product 12 (about 5 minutes). Immersion while applying ultrasonic waves requires approximately one-tenth of the time required for the thermosetting resin to penetrate sufficiently, compared to the case where ultrasonic waves are not applied.

  Next, in the drying step 104 shown in FIG. 1, the molded article 12 infiltrated with the thermosetting resin is forcibly dried while blowing air with a fan 14 at room temperature, as shown in FIG. 2 (e).

  Next, in the secondary press thermoforming step 105 shown in FIG. 1, the mold 6 shown in FIG. 2C is heated in advance to 150 ° C. or higher, and the press-molding is performed again on the molded product 12.

  Thus, after impregnating the molding 12 molded in the shape of the diaphragm in the primary press thermoforming process 102 with the thermosetting resin, and disposing the thermosetting resin inside and on the surface of the molding 12. By performing press heat forming again in the secondary press heat forming step 105, the shape retention property of the molded product 12 is improved and it becomes difficult to return to the shape before forming, so that the yield rate is improved.

  Next, in a molding step 106 shown in FIG. 1, a punching process is performed in which a center hole is formed in the molded product 12 and the molded product 12 is molded to a predetermined outer diameter using a punching die having a predetermined shape. Then, the molded product 12 is coated with a moisture resistant resin. As a result, as shown in FIG. 2 (f), a trumpet-shaped molded article 12 (speaker diaphragm) having a center hole 15 is obtained.

  Next, the manufacturing method of the diaphragm for electroacoustic transducers concerning the 2nd Embodiment of this invention is demonstrated based on FIG.1 and FIG.3.

  First, in the bonded sheet forming step 100 shown in FIG. 1, as shown in FIG. 3A, two wooden sheets 17a and 17b having a thickness of about 0.25 mm are bonded through the adhesive layer 18a. The member 201 to be prepared is prepared, and a sheet member (Japanese paper) 19 other than the wooden sheet is bonded to one surface of the member 201 via the adhesive layer 18b to form the bonded sheet 16.

  As the wooden sheets 17a and 17b, hardwood wood and the like can be used, and in particular, considering the strength against defects such as cracks during production and the sound propagation speed, wood and oak are preferable. As the adhesive layers 18a and 18b, a water-soluble adhesive, an emulsion-based adhesive, or the like can be used. Considering the adhesion to the wooden sheets 17a and 17b, an emulsion adhesive or the like is suitable as the adhesive layers 18a and 18b. Further, considering that the sheet member (Japanese paper) 19 other than the wooden sheet is easier to extend than the wooden sheets 17a and 17b, the adhesive layer 18a used between the two wooden sheets 17a and 17b is an adhesive layer. It is desirable to use a flexible adhesive material that is more stretchable (followable) than 18b.

  Next, in the dipping step 101 shown in FIG. 1, an aqueous solution 20 containing 5% by weight of ethylene glycol and 0.1% by weight of sodium di2ethylhexyl sulfosuccinate is prepared, and the laminated sheet 16 is cut to an appropriate size. As shown in FIG. 3 (b), it is immersed in the aqueous solution 20. And it is immersed until the flexibility comes out to the bonding sheet | seat 16 (about 20 minutes). In FIG. 3B, some ethyl alcohol was dissolved in the aqueous solution 20 in order to shorten the work drying time.

  Next, in the primary press thermoforming step 102 shown in FIG. 1, the pliable laminated sheet 16 is press thermoformed with a mold 21 heated to 100 ° C. or higher in advance as shown in FIG. To do. The mold 21 is a male and female type comprising a male mold 22 and a female mold 23 formed in a predetermined shape, and has heaters 24 and 25. At the time of pressing, since no lubricant is contained in the aqueous solution 20, no deposits are generated on the mold 21, the bonded sheet 16 is not baked on the mold 21, and there are no defects such as cracks. A good molded product was obtained.

  Next, in the thermosetting resin impregnation step 103 shown in FIG. 1, the molded product 26 obtained in the primary press thermoforming step 102 is immersed in the thermosetting resin solution 27 as shown in FIG. At the same time, vibration by the ultrasonic vibrator 28a is applied to the thermosetting resin solution 27 and immersed until the thermosetting resin sufficiently penetrates into the molded product 26 (about 5 minutes). Immersion while applying ultrasonic waves requires approximately one-tenth of the time required for the thermosetting resin to penetrate sufficiently, compared to the case where ultrasonic waves are not applied. As a result of observing the molded product 26 thus obtained in an atmosphere of a temperature of 60 ° C. and a relative humidity of 90% for 24 hours, it was found that the deformation was remarkably small as compared with the case where no ultrasonic wave was used. .

  Next, in the drying step 104 shown in FIG. 1, the molded product 26 infiltrated with the thermosetting resin is forcibly dried while blowing air with a fan 28b at room temperature, as shown in FIG. 3 (e). Compared with methods using high temperature air (for example, infrared lamps or hot air forced drying), forced drying with normal temperature wind has a defect rate of cracking of about one-tenth in the secondary press thermoforming process 105 in the next process. It turns out that it can be suppressed.

  Next, in the secondary press thermoforming step 105 shown in FIG. 1, the mold 21 shown in FIG. 3C is heated in advance to 150 ° C. or higher, and press molding is performed on the molded product 26 again.

  As described above, after the molded product 26 formed into the diaphragm shape in the primary press thermoforming process 102 is impregnated with the thermosetting resin, and the thermosetting resin is disposed inside and on the surface of the molded product 26. By performing the press thermoforming again in the secondary press thermoforming step 105, the shape retaining property of the molded product 26 is improved and it becomes difficult to return to the shape before molding, so the yield rate is improved.

  Then, in the molding step 106 shown in FIG. 1, after a punching process for forming a center hole in the molded product 26 and molding the molded product 26 to a predetermined outer diameter using a punching die having a predetermined shape, Coat the resin. As a result, as shown in FIG. 3F, a trumpet-shaped molded product 26 (speaker diaphragm) having a center hole 26a is obtained.

  Next, the manufacturing method of the diaphragm for electrical converters concerning the 3rd Embodiment of this invention is demonstrated based on FIG.1 and FIG.4.

  First, in the bonded sheet forming step 100 shown in FIG. 1, as shown in FIG. 4A, two wooden sheets 29a and 29b having a thickness of about 0.5 mm are bonded together through the adhesive layer 30a. A member 203 is prepared, and a sheet member (nonwoven fabric) 31 other than a wooden sheet having a thickness of approximately 0.05 mm is bonded to one surface of the member 203 via an adhesive layer 31b, thereby reducing the thickness to 0. A 60 mm bonded sheet 28 is formed.

  As the wooden sheets 29a and 29b, hardwood timber and the like can be used, and in particular, in consideration of the strength against defects such as cracks during production and acoustic propagation characteristics, wood and oak are preferable. As the adhesive layers 30a and 30b, a water-soluble adhesive, an emulsion adhesive, or the like can be used. Considering the adhesion to the wooden sheets 29a and 29b, an emulsion adhesive or the like is suitable as the adhesive layers 30a and 30b. Further, considering that the sheet member (nonwoven fabric) 31 other than the wooden sheet is easier to extend than the wooden sheets 29a and 29b, the adhesive layer 31a used between the two wooden sheets 29a and 29b is an adhesive layer. It is desirable to use a flexible adhesive that is more elongated than 31b (has a follow-up property to displacement during deformation).

  Next, in the dipping process 101 shown in FIG. 1, an aqueous solution 32 containing 0.1% by weight of di-2-ethylhexylsulfosuccinate soda is prepared, and a bonded sheet 28 cut to an appropriate size is prepared as shown in FIG. 4 (b). Immerse in the aqueous solution 32. And it is immersed until the flexibility comes out to the bonding sheet | seat 16 (about 20 minutes).

  Next, in the primary press thermoforming step 102 shown in FIG. 1, the pliable bonded sheet 28 is press thermoformed with a die 33 that has been heated to 100 ° C. or higher in advance as shown in FIG. To do. The mold 33 is of a male and female type comprising a male mold 34 and a female mold 35 formed in a predetermined shape, and has heaters 36 and 37. At the time of pressing, since no lubricant is contained in the aqueous solution 32, no deposits are generated on the mold 33, the bonded sheet 28 is not baked on the mold 33, and there are no defects such as cracks. A good molded product was obtained.

  Next, in the thermosetting resin impregnation step 103 shown in FIG. 1, the molded product 38 obtained in the primary press thermoforming step 102 is immersed in the thermosetting resin solution 39 as shown in FIG. . Immerse until the thermosetting resin sufficiently penetrates the molding 38 (about 60 minutes).

  Next, in the drying step 104 shown in FIG. 1, the molded product 38 infiltrated with the thermosetting resin is forcibly dried while blowing air with a fan 40 at room temperature, as shown in FIG. Compared with methods using high temperature air (for example, infrared lamps or hot air forced drying), forced drying with normal temperature wind has a defect rate of cracking of about one-tenth in the secondary press thermoforming process 105 in the next process. It turns out that it can be suppressed.

  Next, in the secondary press thermoforming process 105 shown in FIG. 1, the mold 33 shown in FIG. 4C is heated in advance to 150 ° C. or higher, and press molding is performed on the molded product 38 again.

  As described above, after the molded product 38 formed into the diaphragm shape in the primary press thermoforming process 102 is impregnated with the thermosetting resin, and the thermosetting resin is disposed inside and on the surface of the molded product 38. By performing press heat molding again, the shape retention of the molded product 38 is improved and it becomes difficult to return to the shape before molding, so that the yield rate is improved.

  In the molding step 106 shown in FIG. 1, after performing a punching process for forming the center hole 41 in the molded product 38 and molding the molded product 38 to a predetermined outer diameter using a punching die having a predetermined shape. Coat with moisture-resistant resin. As a result, as shown in FIG. 4 (f), a trumpet shaped product 38 having a center hole 41 is obtained.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

  Next, the manufacturing method of the diaphragm for electroacoustic transducers concerning the 4th Embodiment of this invention is demonstrated based on FIG.1 and FIG.5.

  First, in the bonded sheet forming process 100 shown in FIG. 1, as shown in FIG. 5A, two wooden sheets 43a and 43b having a thickness of about 0.25 mm are bonded together via an adhesive layer 44a. A member 204 is prepared. On one surface of the member 204, a sheet member (nonwoven fabric) 45a other than a wooden sheet having a thickness of about 0.05 mm is bonded via an adhesive layer 44b. A laminated sheet 42 is formed on the other surface of the member 204 by sticking a sheet member (nonwoven fabric) 45b other than a wooden sheet having a thickness of approximately 0.05 mm via an adhesive layer 44c.

  As the wooden sheets 43a and 43b, hardwood wood or the like can be used, and in particular, in consideration of strength against defects such as cracks during production and acoustic propagation characteristics, wood, oak, and the like are preferable. As the adhesive layers 44a, 44b, 44c, a water-soluble adhesive, an emulsion adhesive, or the like can be used. Considering the adhesion to the wooden sheets 43a, 43b, an emulsion adhesive or the like is suitable as the adhesive layers 44a, 44b, 44c. Further, considering that the sheet members (nonwoven fabrics) 45a and 45b other than the wooden sheets are easier to extend than the wooden sheets 43a and 43b, the adhesive layer 44a used between the two wooden sheets 43a and 43b is bonded. It is desirable to use a flexible adhesive that is longer than the material layers 44b and 44c (that is capable of following displacement).

  Next, in the dipping process 101 shown in FIG. 1, an aqueous solution 46 containing 10% by weight of ethyl alcohol and 0.05% by weight of 2-ethylhexyl sulfosuccinate soda is prepared, and the bonded sheet 42 is cut into an appropriate size. As shown in (b), it is immersed in the aqueous solution 46. And it is immersed until the flexibility comes out to the bonding sheet | seat 42 (about 20 minutes).

  Next, in the primary press thermoforming step 102 shown in FIG. 1, the pliable bonded sheet 42 is press thermoformed with a die 47 heated to 100 ° C. or higher in advance as shown in FIG. To do. The mold 47 is of a male and female type consisting of a male mold 48 and a female mold 49 formed in a predetermined shape, and has heaters 50 and 51. At the time of this pressing, since no lubricant is contained in the aqueous solution 46, no deposits are generated on the mold 47, and the bonded sheet 42 is not baked on the mold 47. In addition, the reinforcing effect of the nonwoven fabrics 45a and 45b provided on both surfaces of the bonded sheet 42 has resulted in a highly productive process without cracking defects.

  Next, in the thermosetting resin impregnation step 103 shown in FIG. 1, the molded product 52 obtained in the primary press thermoforming step 102 is immersed in the thermosetting resin solution 53 as shown in FIG. . At the same time, vibration by the ultrasonic vibrator 54 is applied to the thermosetting resin solution 53 and immersed until the thermosetting resin sufficiently permeates (about 5 minutes). Immersion while applying ultrasonic waves requires approximately one-tenth of the time required for the thermosetting resin to penetrate sufficiently, compared to the case where ultrasonic waves are not applied.

  Next, in the drying step 104 shown in FIG. 1, the molded product 52 infiltrated with the thermosetting resin is forcibly dried while blowing air with a fan 55 at room temperature, as shown in FIG.

  Next, in the secondary press thermoforming step 105 shown in FIG. 1, the mold 47 shown in FIG. 5C is heated in advance to 150 ° C. or higher, and press molding is performed on the molded product 52 again.

  In this way, after the molded product 52 molded in the shape of the diaphragm in the primary press thermoforming process 102 is impregnated with the thermosetting resin, and the thermosetting resin is disposed inside and on the surface of the molded product 52. By performing press heat molding again, the shape retaining property of the molded product 52 is improved and it becomes difficult to return to the shape before molding, so that the yield rate is improved.

  Then, in the molding step 106 shown in FIG. 1, after a punching process for forming a center hole in the molded product 52 and molding the molded product 52 to a predetermined outer diameter using a punching die having a predetermined shape, Coat the resin. As a result, as shown in FIG. 5F, a trumpet-shaped molded product 52 (speaker diaphragm) having a center hole 56 is obtained. It should be noted that by applying heat-resistant wood grain printing to the surface of the nonwoven fabric 45a on the inner surface side in advance, it is possible to meet the demands of people who prefer the wood-tone appearance.

  Next, the manufacturing method of the diaphragm for electroacoustic transducers concerning the 5th Embodiment of this invention is demonstrated based on FIG.1 and FIG.6.

  First, in the bonded sheet forming process 100 shown in FIG. 1, as shown in FIG. 6A, two wooden sheets 58a and 58b having a thickness of about 0.25 mm are bonded together through an adhesive layer 59b. A member 205 is prepared. On one surface of the member 205, a sheet member (nonwoven fabric) 60 made of a material different from the wooden sheets 58a and 58b is attached via an adhesive layer 59a. A laminated sheet 57 is formed on the other surface of the member 205 by bonding a sheet member (nonwoven fabric) 73 made of a material different from the wooden sheet through a spot-like adhesive layer 72.

  As the wooden sheets 58a and 58b, hardwood timber or the like can be used, and in particular, considering the strength against defects such as cracks during production and the acoustic propagation speed, wood and oak are preferable. As the adhesive layers 59a, 59b, 72, a water-soluble adhesive, an emulsion adhesive, or the like can be used. The thickness of the nonwoven fabrics 60 and 73 can be 0.01-0.1 mm, for example. Further, considering that the sheet member (nonwoven fabric) 73 other than the wooden sheet is easier to extend than the wooden sheets 58a and 58b, the adhesive layer 59b used between the two wooden sheets 58a and 58b is the adhesive layer 59a, It is desirable to use a flexible adhesive that is more elongated than 72 (has followability to shift).

  Next, in the dipping step 101 shown in FIG. 1, an aqueous solution 61 containing 5% by weight of glucose and 0.02% by weight of sodium lauryl sulfate is prepared, and the laminated sheet 57 is cut into an appropriate size, and FIG. As shown in FIG. And it is immersed in the bonding sheet | seat 57 until flexibility comes out (about 20 minutes).

  Next, in the primary press thermoforming step 102 shown in FIG. 1, the pliable bonded sheet 57 is press thermoformed with a mold 62 heated to 100 ° C. or higher in advance as shown in FIG. 6C. To do. The mold 62 is of a male and female type consisting of a male mold 63 and a female mold 64 formed in a predetermined shape, and has heaters 65 and 66. At the time of this pressing, since no lubricant is contained in the aqueous solution 61, no deposit is generated on the mold 62, and the bonded sheet 57 is not baked on the mold 62. In addition, the reinforcing effect of the nonwoven fabrics 60 and 73 provided on both surfaces of the bonded sheet 57 resulted in a highly productive process with no crack defects. After press thermoforming, the nonwoven fabric 73 spot-bonded to the inner surface is peeled from the wooden sheet 58b.

  Next, in the thermosetting resin impregnation step 103 shown in FIG. 1, the molded product 67 formed by the primary press thermoforming step 102 and the non-woven fabric 73 is peeled off, as shown in FIG. Immerse in the resin solution 68. At the same time, vibration by the ultrasonic vibrator 69 is applied to the thermosetting resin solution 68 and immersed until the thermosetting resin sufficiently permeates (about 5 minutes). Immersion while applying ultrasonic waves requires approximately one-tenth of the time required for the thermosetting resin to penetrate sufficiently, compared to the case where ultrasonic waves are not applied.

  Next, in the drying step 104 shown in FIG. 1, the molded product 67 infiltrated with the thermosetting resin is forcibly dried while blowing air with a fan 70 at room temperature, as shown in FIG. 6 (e).

  Next, in the secondary press thermoforming step 105 shown in FIG. 1, the mold 62 shown in FIG. 6C is heated in advance to 150 ° C. or higher, and press molding is performed again on the molded product 67.

  Thus, after impregnating thermosetting resin with respect to the molded product 67 shape | molded in the diaphragm shape by the primary press thermoforming process 102, and arrange | positioning thermosetting resin to the inside and surface of the molded product 67, it is. By performing press heat molding again, the shape retention of the molded product 67 is improved and it becomes difficult to return to the shape before molding, so the yield rate is improved.

  Then, in the molding step 106 shown in FIG. 1, after a punching process for forming a center hole in the molded product 67 and molding the molded product 67 to a predetermined outer diameter using a punching die having a predetermined shape, Coat the resin. As a result, as shown in FIG. 6F, a trumpet-shaped molded product 67 (speaker diaphragm) in which the center hole 71 is formed is obtained.

  Next, the manufacturing method of the diaphragm for electroacoustic transducers concerning the 6th Embodiment of this invention is demonstrated based on FIG.1 and FIG.7.

  First, in the bonded sheet forming step 100 shown in FIG. 1, as shown in FIG. 7A, two wooden sheets 75a and 75b having a thickness of about 0.25 mm are bonded together via an adhesive layer 76a. The member 206 is prepared, and a sheet member (four-axis woven fabric) 77 made of a material different from the wooden sheets 75a and 75b is bonded to one surface of the member 206 via the adhesive layer 76b. A sheet 74 is formed.

  Next, in the dipping step 101 shown in FIG. 1, an aqueous solution 78 containing 5% by weight of glucose and 0.05% by weight of 2-ethylhexyl sulfosuccinate soda is prepared, and the laminated sheet 74 is cut to an appropriate size. As shown in (b), it is immersed in the aqueous solution 78. And it is immersed in the bonding sheet 74 until flexibility comes out (about 20 minutes).

  Next, in the primary press thermoforming step 102 shown in FIG. 1, the pliable laminated sheet 74 is press thermoformed with a die 79 that has been heated to 100 ° C. or higher in advance, as shown in FIG. 7C. To do. The mold 79 is a male and female type consisting of a male mold 80 and a female mold 81 formed in a predetermined shape, and has heaters 82 and 83. At the time of this pressing, since no lubricant is contained in the aqueous solution 78, no deposits are generated on the mold 79, and the bonded sheet 74 is not baked on the mold 79. In addition, since the four-axis woven cloth 77 provided on one side of the bonded sheet 74 provides uniform reinforcement in the vertical and horizontal directions, the process has a higher productivity without cracking defects.

  Next, in the thermosetting resin impregnation step 103 shown in FIG. 1, the molded product 84 obtained in the primary press thermoforming step 102 is immersed in the thermosetting resin solution 85 as shown in FIG. . At the same time, vibration by the ultrasonic vibrator 86 is applied to the thermosetting resin solution 85 and immersed until the thermosetting resin sufficiently permeates (about 5 minutes). Immersion while applying ultrasonic waves requires approximately one-tenth of the time required for the thermosetting resin to penetrate sufficiently, compared to the case where ultrasonic waves are not applied.

  Next, in the drying step 104 shown in FIG. 1, the molded article 84 infiltrated with the thermosetting resin is forcibly dried while blowing air with a fan 87 at room temperature, as shown in FIG.

  Next, in the secondary press thermoforming step 105 shown in FIG. 1, the die 79 shown in FIG. 7C is heated in advance to 150 ° C. or higher, and press molding is performed again on the molded product 84.

  As described above, after the molded product 84 formed into the diaphragm shape in the primary press thermoforming process 102 is impregnated with the thermosetting resin, and the thermosetting resin is disposed inside and on the surface of the molded product 84. By performing press heat molding again, the shape retention of the molded product 84 is improved and it becomes difficult to return to the shape before molding, so the yield rate is improved.

  Then, in the molding step 106 shown in FIG. 1, after a punching process for forming a center hole in the molded product 84 and molding the molded product 84 to a predetermined outer diameter using a punching die having a predetermined shape, Coat the resin. As a result, as shown in FIG. 7F, a trumpet-shaped molded article 84 (speaker diaphragm) in which a center hole 88 is formed is obtained.

  Next, the manufacturing method of the diaphragm for electroacoustic transducers concerning the 7th Embodiment of this invention is demonstrated based on FIG.1 and FIG.2.

  First, in the bonded sheet forming step 100 shown in FIG. 1, as shown in FIG. 2 (a), two wooden sheets 2a and 2b having a thickness of about 0.25 mm are bonded together via an adhesive layer 3a. The non-woven fabric 4 which is a sheet member made of a material different from the wooden sheets 2a and 2b is bonded to one surface of the member 200 via the adhesive layer 3b. Form.

  Next, in the immersion step 101 shown in FIG. 1, an aqueous solution containing 0.05% by weight of sodium butylnaphthalene sulfonate is prepared, and the bonded sheet 1 is cut into an appropriate size, as shown in FIG. Immerse in this aqueous solution 5. And it is immersed until the flexibility comes out to the bonding sheet | seat 1 (about 20 minutes). Butyl naphthalene sulfonic acid soda is a kind of alkyl naphthalene sulfonic acid soda and is a penetrant. Moreover, the nonwoven fabric 4 can give the role of the reinforcing material which reinforces the intensity | strength of the wooden sheets 2a and 2b. For example, the nonwoven fabric 4 is paper made by weaving yarn made of paper pulp.

  Next, in the primary press thermoforming step 102 shown in FIG. 1, the pliable laminated sheet 1 is press thermoformed with a mold 6 heated to 100 ° C. or higher in advance as shown in FIG. 2 (c). To do. The mold 6 is a male and female type consisting of a male mold 7 and a female mold 8 formed in a predetermined shape, and has heaters 9 and 10.

  In addition to the butyl naphthalene sulfonic acid soda entering the wooden sheets 2a and 2b and imparting elasticity to the wooden sheets 2a and 2b, the butyl naphthalene sulfonic acid soda has an effect of giving more moisture to the wooden sheets 2a and 2b. By exhibiting this, it is possible to achieve a large elongation of the wooden sheets 2a, 2b, so that the wooden sheets 2a, 2b are unlikely to break in the mold 6 during press heat forming.

  Further, since no lubricant is contained in the aqueous solution 5, no deposits are generated on the mold 6 during pressing, and the bonded sheet 1 is not baked on the mold 6, and there are defects such as cracks. A good molded product was obtained.

  Next, in the thermosetting resin impregnation step 103 shown in FIG. 1, the molded product 12 obtained in the primary press thermoforming step 102 is immersed in the thermosetting resin solution 11 as shown in FIG. . At the same time, vibration by the ultrasonic vibrator 13 is applied to the thermosetting resin solution 11 and immersed until the thermosetting resin sufficiently permeates (about 5 minutes). Immersion while applying ultrasonic waves requires approximately one-tenth of the time required for the thermosetting resin to penetrate sufficiently, compared to the case where ultrasonic waves are not applied.

  Next, in the drying step 104 shown in FIG. 1, the molded article 12 infiltrated with the thermosetting resin is forcibly dried while blowing air with a fan 14 at room temperature, as shown in FIG. 2 (e).

  Next, in the secondary press thermoforming step 105 shown in FIG. 1, the mold 6 shown in FIG. 2C is heated in advance to 150 ° C. or higher, and the press-molding is performed again on the molded product 12.

  Thus, after impregnating the molding 12 molded in the shape of the diaphragm in the primary press thermoforming step 102 with the thermosetting resin and disposing the thermosetting resin inside and on the surface of the molding 12. By performing press heat forming again in the secondary press heat forming step 105, the shape retention property of the molded product 12 is improved and it becomes difficult to return to the shape before forming, so that the yield rate is improved.

  Next, in a molding step 106 shown in FIG. 1, a punching process for molding the molded product 12 to a predetermined outer diameter is performed on the molded product 12 using a punching die having a predetermined shape. Then, the molded product 12 is coated with a moisture resistant resin. Thus, unlike FIG. 2 (f), a small diaphragm 804 for an earphone or a headphone in which the center hole 15 is not formed is formed. The obtained diaphragm 804 is shown in FIG.

  Next, a method for manufacturing a diaphragm for an electroacoustic transducer according to an eighth embodiment of the present invention will be described with reference to FIGS.

  First, in the dipping step 101 shown in FIG. 1, as shown in FIG. 3 (a), two wooden sheets 17a and 17b having a thickness of about 0.25 mm are bonded together via an adhesive layer 18a. 201 is prepared, and a laminated sheet 16 is formed by laminating a sheet member (Japanese paper) 19 other than a wooden sheet on one surface of the member 201 via an adhesive layer 18b.

  Next, in the dipping step 101 shown in FIG. 1, an aqueous solution 20 containing 5% by weight of ethylene glycol and 0.1% by weight of sodium di-2-ethylhexyl sulfosuccinate is prepared, and the laminated sheet 16 is cut to an appropriate size. As shown in FIG. 3 (b), it is immersed in the aqueous solution 20. And it is immersed until the flexibility comes out to the bonding sheet | seat 16 (about 20 minutes). Note that some ethyl alcohol was dissolved in the aqueous solution 20 in order to speed up the drying time of the workpiece. Here, ethylene glycol and ethyl alcohol are wetting agents, and di-2-ethylhexylsulfosuccinate sodium is a kind of dialkylsulfosuccinate and a penetrant. Further, the sheet member 19 can serve as a reinforcing material that reinforces the strength of the wooden sheets 2a and 2b. For example, the sheet member 19 is a non-woven fabric or a 4-axis woven fabric.

  Next, in the primary press thermoforming step 102 shown in FIG. 1, the pliable laminated sheet 16 is press thermoformed with a mold 21 heated to 100 ° C. or higher in advance as shown in FIG. To do. The mold 21 is a male and female type comprising a male mold 22 and a female mold 23 formed in a predetermined shape, and has heaters 24 and 25. At the time of pressing, since no lubricant is contained in the aqueous solution 20, no deposits are generated on the mold 21, the bonded sheet 16 is not baked on the mold 21, and there are no defects such as cracks. A good molded product was obtained.

  Next, in the thermosetting resin impregnation step 103 shown in FIG. 1, the molded product 26 obtained in the primary press thermoforming step 102 is immersed in the thermosetting resin solution 27 as shown in FIG. At the same time, vibration by the ultrasonic vibrator 28a is applied to the thermosetting resin solution 27 and immersed until the thermosetting resin sufficiently permeates (about 5 minutes). Immersion while applying ultrasonic waves requires approximately one-tenth of the time required for the thermosetting resin to penetrate sufficiently, compared to the case where ultrasonic waves are not applied. As a result of observing the molded product 26 thus obtained in an atmosphere having a temperature of 60 ° C. and a relative humidity of 90% for 24 hours, it was found that the deformation was remarkably small as compared with the case where no ultrasonic wave was used.

  Next, in the drying step 104 shown in FIG. 1, the molded product 26 infiltrated with the thermosetting resin is forcibly dried while blowing air with a fan 28b at room temperature, as shown in FIG. 3 (e). Compared with methods using high temperature air (for example, infrared lamps or hot air forced drying), forced drying with normal temperature wind can suppress the defect rate of cracking in press-heat forming in the next process to about 1/10. all right.

  Next, in the secondary press thermoforming step 105 shown in FIG. 1, the mold 21 shown in FIG. 3C is heated in advance to 150 ° C. or higher, and press molding is performed on the molded product 26 again.

  As described above, after the molded product 26 formed into the diaphragm shape in the primary press thermoforming process 102 is impregnated with the thermosetting resin, and the thermosetting resin is disposed inside and on the surface of the molded product 12. By performing the press thermoforming again in the secondary press thermoforming step 105, the shape retaining property of the molded product 26 is improved and it becomes difficult to return to the shape before molding, so the yield rate is improved.

  In the molding step 106 shown in FIG. 1, a punching process for molding the molded product 26 into a predetermined outer diameter using a punching die having a predetermined shape is performed, followed by coating with a moisture-resistant resin. As a result, unlike FIG. 3F, a small diaphragm 804 for an earphone or headphone in which the center hole 26a is not formed is formed. The diaphragm 804 is shown in FIG.

  In the first to seventh embodiments, the thicknesses of the two wooden sheets may not be the same, for example, one may be 0.2 mm thick and the other may be 0.3 mm thick. That is, in the bonded sheet forming step 100 of FIG. 1, a plurality of two kinds of wooden sheets having different thicknesses are prepared in advance. Then, by combining two wooden sheets having a thickness as required from a plurality of wooden sheets to produce a bonded sheet 1, a total of 3 diaphragms for electroacoustic transducers having different thicknesses can be obtained. Kind, can be manufactured. By manufacturing three types, the types of diaphragms for electroacoustic transducers that can be manufactured in a size suitable for each thickness can be increased, and thus productivity is improved.

  Alternatively, three types of wooden sheets having different thicknesses, for example, 0.2 mm thick, 0.3 mm thick, and 0.45 mm thick wooden sheets are prepared in advance as the wooden sheets. And by using two wooden sheets of the same thickness or different thicknesses from among the prepared wooden sheets, a total of 6 types of diaphragms for electroacoustic transducers with different thicknesses can be manufactured. it can. Thus, the more the wooden sheets with various thicknesses are prepared, the more various diaphragms for electroacoustic transducers with suitable thickness can be produced as necessary. The degree of freedom increases.

  Of course, in the electroacoustic transducer diaphragm shown in the eighth embodiment, the thicknesses of the two wooden sheets 2a and 2b may not be the same. For example, if a wooden sheet having a thickness of 0.025 mm, 0.035 mm, and 0.045 mm is prepared in advance and the wooden sheets are combined in accordance with the required thickness in the bonded sheet forming step 100, the thickness is increased. 6 types of diaphragms for electroacoustic transducers can be manufactured.

  In addition, the wooden sheet | seat used for the diaphragm for electroacoustic transducers shown in 1st-8th embodiment is producible by exfoliating thinly and making it a sheet | seat by means, such as peeling off. At this time, in some cases, by applying a blade while applying pressure to the surface of the wood, the surface of the produced wooden sheet may generate numerous defects such as small distortions and small scratches (surface defects). . When a wooden sheet having a large number of surface defects on the wooden sheet is used, the defect area may be widened by pressure or elongation force during molding. Defects are not limited to the surface, but may extend deep in the thickness direction, resulting in cracking of the wooden sheet.

  According to the diaphragm for electroacoustic transducers according to the embodiment of the present invention, by stacking a plurality of wooden sheets, it is possible to average the occurrence of defects in the wooden sheet than when using a single wooden sheet, The adhesive layer disposed between the wooden sheets makes it easy to prevent the defect from spreading in the thickness direction. In addition, since the thickness of the diaphragm can be easily adjusted by laminating a plurality of thin wooden sheets, it is not necessary to prepare various wooden sheets according to the required thickness of the diaphragm in advance. Therefore, it is easy to manage inventory in small quantities of other varieties, and it is possible to efficiently produce resources that do not sleep as inventory.

(Speaker configuration)
FIG. 8 is a cross-sectional view of a speaker using the electroacoustic transducer diaphragm according to the first to sixth embodiments.
In the speaker 700, a rubber edge 702 having a predetermined shape is bonded to the outer periphery of the trumpet-shaped speaker diaphragm 701 manufactured by the manufacturing method according to any of the first to sixth embodiments, A bobbin (a predetermined damper 704 is bonded in advance) of a voice coil 703 having a predetermined shape is inserted and bonded to the center hole of the speaker diaphragm 701.

  These three integrated parts are attached to a predetermined speaker housing 705 (a predetermined magnetic circuit 706 is previously installed) by adhesion. A metal wire (not shown) for energization is drawn out from the voice coil 703 to a terminal (not shown, which is insulated from the metal housing 705 in advance) attached to the housing 705. It is connected.

  The magnetic circuit 706 includes a donut-shaped plate 707, a donut-shaped magnet 708, a pole 709, and the like, and a voice coil 703 is loosely inserted in a magnetic gap 710 formed between the plate 707 and the pole 709. By magnetizing the magnet 708, the speaker is completed. Reference numeral 711 denotes a dust cap that prevents foreign matter from entering the voice coil 703, and reference numeral 712 denotes an annular arrow paper that holds the end of the edge 702.

  In the speaker 700, the thickness of the speaker diaphragm 701 formed of a wooden sheet is substantially uniform, and excellent acoustic characteristics with little distortion are obtained.

  Loudspeaker diaphragms made of wooden sheets can produce reproduced sounds that are close to natural sounds. In particular, they can reproduce medium to high sounds such as human voices and violin sounds, and have a high-quality appearance. Therefore, it can be used for high-quality audio devices, high-quality home theater systems, broadcast station monitors, etc. that require high-quality sound quality and high-quality appearance.

(Configuration of earphone or headphone)
Fig.9 (a) is sectional drawing which shows an example in the case of applying the diaphragm which concerns on 7th and 8th embodiment for earphones or headphones.

  In Fig.9 (a), in the outer peripheral part of the dome-shaped diaphragm 804 which consists of the sheet | seat member 802 other than the wooden sheet | seat 803 and the wooden sheet | seat produced by either manufacturing method shown in 7th and 8th embodiment, An edge 801 having a predetermined shape is bonded over the entire circumference. The edge 801 is made of rubber or a soft plastic film.

  FIG. 9B is a cross-sectional view showing an example of a headphone using the diaphragm according to the seventh and eighth embodiments. In the headphone 800 shown in FIG. 9B, a bobbin (voice coil bobbin) having a voice coil 806 having a predetermined shape is bonded to the central portion of the diaphragm according to the seventh and eighth embodiments. Yes. An outer peripheral portion of the vibration plate 804 is bonded to a housing 816 constituting a part of the back air chamber 809, and the vibration plate 804 is fixed to the housing 816. When a current flows in the voice coil 806 on the permanent magnet 805 side, a mechanical driving force is generated in the voice coil 806, and the driving force is transmitted to the diaphragm 804 through the voice coil bobbin 815. Information as a change in current becomes the movement of the diaphragm 804, and the surrounding air is vibrated, resulting in a sound with information. The sound reaches the ear (not shown) through the ear canal 813. At this time, an air pad 812 is provided to prevent the sound from spreading outside the ear and to block noise from the outside, thereby improving the adhesion between the side of the face and the headphones 800. In order to make the vibration of the diaphragm 804 smoother and to control the movement of air on the rear surface of the diaphragm 804, a back air chamber 810, a rear leakage hole 807, and a back air chamber 809 are provided. Further, in order to control the movement of the entire surface of the diaphragm 804, a front polar chamber 811 is provided, and a number of front leakage holes 808 are provided in the protective material 823 and the protective edge 822.

  When the diaphragm 804 shown in FIG. 9A is applied to an earphone, the structure shown in FIG. 9B may be modified. For example, as shown in FIG. 9C, a projection 917 to be inserted into the ear canal is provided at the center of the mounting surface.

  In the earphone 900 shown in FIG. 9C, a bobbin (voice coil bobbin) 906 of a voice coil 906 having a predetermined shape is bonded to the central portion of the diaphragm according to the seventh and eighth embodiments. An outer peripheral portion of the vibration plate 904 is bonded to a housing 916 constituting a part of the back air chamber 909, and the vibration plate 904 is fixed to the housing 916. When a current flows in the voice coil 906 on the permanent magnet 905 side, a mechanical driving force is generated in the voice coil 906, and the driving force is transmitted to the diaphragm 904 through the voice coil bobbin 906. Information as a change in current becomes a movement as vibration of the diaphragm 904, and the surrounding air is vibrated, resulting in a sound with information. Sound reaches the ear (not shown) through the ear canal 913. Further, an ear hole projection 917 is provided in front of the ear hole in front of the diaphragm 904, and a through hole through which sound passes is provided at the center. By inserting the ear hole projection 917 into the ear canal, it is possible to prevent the sound from spreading outside the ear and to prevent external noise.

  In order to make the vibration of the diaphragm 904 smoother and to control the movement of air on the rear surface of the diaphragm 904, a back air chamber 910, a rear leakage hole 907, and a back air chamber 909 are provided. Further, in order to control the movement of the entire surface of the diaphragm 904, a front polar chamber 911 is provided, and a number of front leakage holes 908 are provided in the protective material 923 and the protective edge 922.

  The speakers, headphones, and earphones are also called electroacoustic transducers. In addition to the above-described embodiment, the electroacoustic transducer includes a buzzer and the like.

  According to the manufacturing method of the present invention, this type of electroacoustic transducer diaphragm can be manufactured at a lower cost, so that not only the above-mentioned expensive products but also low-cost stationary audio devices and It can also be used for portable audio devices.

  Further, according to the manufacturing method of the present invention, the elasticity of the wooden sheet is improved, so that it can be processed into a complicated shape, and a highly fashionable product that requires a variety of shapes and space requirements. It can also be used for compact products that are difficult to handle.

  Therefore, it can be said that it is extremely useful because a great degree of satisfaction can be obtained in every product.

  The present invention is not limited to the above-described embodiments, and various modifications can be made to the above-described embodiments without departing from the gist of the present invention.

It is explanatory drawing of the manufacturing method of the diaphragm for electroacoustic transducers of this invention. It is explanatory drawing of 1st Embodiment of this invention. It is explanatory drawing of 2nd Embodiment of this invention. It is explanatory drawing of 3rd Embodiment of this invention. It is explanatory drawing of 4th Embodiment of this invention. It is explanatory drawing of 5th Embodiment of this invention. It is explanatory drawing of 6th Embodiment of this invention. It is sectional drawing of one Embodiment of the speaker apparatus using the diaphragm for electroacoustic transducers by the manufacturing method of this invention. It is sectional drawing of one Embodiment of the earphone or headphone using the diaphragm for electroacoustic transducers concerning 7th and 8th embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Laminated sheet 2a, 2b ... Wooden sheet 3a, 3b ... Adhesive material layer 4 ... Sheet member 5 ... Aqueous solution 6 ... Mold 7 ... Male type 8 ... Female type 9 ... Heater 11 ... Thermosetting resin solution 12 ... Molding Material 13 ... Ultrasonic vibrator 14 ... Fan 15 ... Center hole 16 ... Laminated sheet 17a, 17b ... Wooden sheet 18a, 18b ... Adhesive layer 19 ... Sheet member 20 ... Aqueous solution 21 ... Mold 22 ... Male 23 ... Female Mold 24 ... Heater 26 ... Molded product 27 ... Thermosetting resin solution 28 ... Laminated sheet 29a, 29b ... Wooden sheet 30a, 30b ... Adhesive layer 31a, 31b ... Adhesive layer 32 ... Aqueous solution 33 ... Mold 34 ... Male Mold 35 ... Female mold 36 ... Heater 38 ... Molded product 39 ... Thermosetting resin solution 40 ... Fan 41 ... Center hole 42 ... Laminated sheet 43a, 43b ... Wooden sheet 44a, 44 b, 44c ... Adhesive layer 45a, 45b ... Nonwoven fabric 46 ... Aqueous solution 47 ... Mold 48 ... Male die 49 ... Female die 50 ... Heater 52 ... Molded product 53 ... Thermosetting resin solution 54 ... Ultrasonic vibrator 55 ... Fan 56 ... Center hole 57 ... Sheet 58a, 58b ... Wooden sheet 59a, 59b ... Adhesive layer 60 ... Non-woven fabric 61 ... Aqueous solution 62 ... Mold 63 ... Male die 64 ... Female die 65 ... Heater 67 ... Molded product 68 ... Thermosetting Resin solution 69 ... Ultrasonic vibrator 70 ... Fan 71 ... Center hole 72 ... Adhesive layer 73 ... Non-woven fabric 74 ... Laminated sheet 75a, 75b ... Wooden sheet 76a, 76b ... Adhesive layer 78 ... Aqueous solution 79 ... Mold 80 ... Male mold 81 ... Female mold 82 ... Heater 84 ... Molded product 85 ... Thermosetting resin solution 86 ... Ultrasonic vibrator 87 ... Fan 88 ... Center hole 200, 201, 203, 204, 2 5, 206 ... member 700 ... speaker 701 ... speaker diaphragm 702 ... edge 703 ... voice coil 704 ... damper 705 ... housing 706 ... magnetic circuit 707 ... plate 708 ... magnet 709 ... pole 710 ... magnetic gap 800 ... headphone 801 ... Edge 802 ... Sheet member 803 ... Wooden sheet 804 ... Diaphragm 805 ... Permanent magnet 806 ... Voice coil 807 ... Rear leak hole 808 ... Front leak hole 809 ... Back air chamber 810 ... Back polar air chamber 811 ... Front polar air Chamber 812 ... Air pad 813 ... Ear hole 815 ... Voice coil bobbin 816 ... Housing 822 ... Protective edge 823 ... Protective material 900 ... Earphone 904 ... Diaphragm 905 ... Permanent magnet 906 ... Voice coil bobbin 907 ... Rear leakage Hole 908 ... Front leakage hole 909 ... Back air chamber 910 ... Back polar air chamber 911 ... Front polar air chamber 913 ... Ear hole 916 ... Housing 917 ... Projection 922 ... Protection edge 923 ... Protective material

Claims (5)

Forming a bonded sheet by bonding a sheet member made of a material different from the wooden sheet to at least one surface of a member formed by laminating a plurality of wooden sheets having a thickness of 0.01 to 3 mm; and
The bonded sheet is in an aqueous solution containing 0.01% to 1% by weight of a penetrant or an aqueous solution containing 0.01% to 1% by weight of a penetrant and 0.1% to 20% by weight of a wetting agent. Dipping in,
The step of molding the soaked bonded sheet into a predetermined shape as a diaphragm by press thermoforming,
The manufacturing method of the diaphragm for electroacoustic transducers characterized by including. A step of forming a bonded sheet by bonding a sheet member made of a material different from the wooden sheet to at least one surface of a member formed by laminating a plurality of wooden sheets having a thickness of 0.01 mm to 1 mm;
The bonded sheet is in an aqueous solution containing 0.01 wt% to 1 wt% penetrant, or an aqueous solution containing 0.01 wt% to 1 wt% penetrant and 0.1 wt% to 10 wt% wetting agent. Dipping in,
The step of molding the soaked bonded sheet into a predetermined shape as a diaphragm by press thermoforming,
The manufacturing method of the diaphragm for electroacoustic transducers characterized by including. A step of impregnating a molded product obtained by press thermoforming with a thermosetting resin;
The method for producing a diaphragm for an electroacoustic transducer according to claim 1, further comprising a step of press-molding the molded article impregnated with the thermosetting resin.   The method for manufacturing a diaphragm for an electroacoustic transducer according to any one of claims 1 to 3, wherein a non-woven fabric or a paper sheet member is used as the sheet member made of a material different from the wooden sheet.   The method for producing a diaphragm for an electroacoustic transducer according to any one of claims 1 to 3, wherein a sheet member made of a woven fabric is used as a sheet member made of a material different from the wooden sheet.

Images