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JP2008199183

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2008199183
PROBLEM TO BE SOLVED: To provide a method of manufacturing a diaphragm for an
electroacoustic transducer using a wood sheet, wherein no breakage occurs in the wood sheet in
the mold at the time of press heating and forming, the lubricant is seized to the mold at the time
of press heating and forming An electro-acoustic transducer using a diaphragm for an electroacoustic transducer which is less likely to cause deformation such as warpage. A wood sheet
having a first wood sheet 2a, a first main surface and a second main surface opposite to the first
main surface, the first main surface being adhered to the first wood sheet 2a. An aqueous
solution containing a penetrant, or an aqueous solution containing a penetrant and a swelling
agent, comprising a laminated sheet 1 including a sheet member 4 of a material different from 2a
and a second wooden sheet 2b adhered to the second main surface The bonding sheet 1 includes
the electro-acoustic transducer diaphragm 701 formed into a predetermined shape as a
diaphragm by primary press heating deformation. [Selected figure] Figure 8
Electro-acoustic transducer
[0001]
The present invention relates to an electroacoustic transducer.
[0002]
A speaker diaphragm using a wooden sheet can reproduce a sound closer to nature as compared
to a speaker diaphragm using paper pulp or plastic, but it breaks when pressed and formed into
a diaphragm shape. There is a technical problem of being easy, and as a solution to this problem,
a manufacturing method disclosed in Patent Document 1 is proposed.
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1
[0003]
This manufacturing method is to immerse the bonded sheet in which non-woven fabric or paper
is bonded to one surface of one wooden sheet in water containing a lubricant, and then pressheat forming is performed. By impregnating the sheet, the wood sheet is provided with
smoothness and flexibility to make it difficult to break during press-heat forming.
JP 10-304492 A
[0004]
However, in the above-mentioned conventional manufacturing method, the slip and the
elongation of the wooden sheet at the time of press thermoforming can not be said to be
sufficient. Therefore, the wooden sheet may still be broken at the time of press thermoforming.
[0005]
Further, in some cases, the lubricant exudes to the surface of the wooden sheet at the time of
press heating and forming, and is seized in the mold, making it difficult for the wooden sheet to
peel off the mold.
In addition, the lubricant sewed to the mold may be partially peeled off, and may become small
pieces and adhere to the diaphragm-shaped molded product, thereby impairing the appearance.
[0006]
Furthermore, since it is necessary to remove the seized lubricant from the speaker diaphragm,
the productivity may be reduced.
Moreover, in order to comprise by the wooden sheet | seat of 1 sheet, the deformation |
transformation of curvature etc. may arise.
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[0007]
An object of the present invention is to provide an electroacoustic transducer which can
eliminate the above-mentioned problems.
[0008]
In order to achieve the above object, the electroacoustic transducer according to the present
invention is a laminated sheet in which two wooden sheets are respectively adhered to both sides
of a sheet member made of a material different from the wooden sheet, An electroacoustic
system comprising a bonding sheet containing an aqueous solution containing at least a
penetration agent of a penetration agent and a wetting agent which is an activator and formed
into a predetermined shape by press heating deformation into a predetermined shape as a
diaphragm. It is characterized in that a diaphragm for converter is used, and a compound of an
aqueous solution containing a penetrating material or a compound of an aqueous solution
containing a penetrating material and a swelling agent remains inside the bonded sheet.
[0009]
The penetrant used in the present invention is, for example, lauryl sulfate, dialkyl sulfosuccinate,
fatty acid amide sulfonate, alkyl naphthalene sulfonate, alkyl phenol ethylene oxide adduct,
middle to higher alcohol ethylene oxide adduct, Contain one or more butyl oleate sulfate and
others.
[0010]
In addition, the wetting agent includes, for example, monohydric alcohol, dihydric alcohol,
trihydric alcohol, ethylene glycols, butyl glycols, propyl glycols, saccharides,
mucopolysaccharides, sugar alcohols, water-soluble multiprotein, etc. Shall be included.
[0011]
In addition, about the use density | concentration of a penetrant, although the permeation effect
with respect to a wood is acquired by 0.001 weight% or more, it is 0.1 weight% or more that the
permeation effect is stably acquired.
In addition, it is desirable that the use concentration of the penetrant be limited to the necessary
minimum amount, in that the penetrant remains in the wooden sheet and affects the durability as
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the diaphragm.
Therefore, the use concentration of the penetrant can preferably be 1% by weight or less.
[0012]
In addition, with respect to the use concentration of the wetting agent, a penetration effect on
wood can be obtained at 0.01% by weight or more, but it is at least 0.1% by weight to stably
obtain the penetration effect.
In addition, it is desirable that the use concentration of the wetting agent be kept to the minimum
necessary amount, from the viewpoint that the retention of the wetting agent in the wood sheet
affects the durability as a 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 wood sheets having a thickness of 0.01 mm to 1 mm.
[0013]
As the “sheet member of a material different from the wood sheet”, for example, non-woven
fabric, paper, woven fabric and the like can be used. When the diaphragm for an electroacoustic
transducer 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 the soft
plastic film, a sponge, cardboard, glass fiber, etc. may be used. If it is necessary to reduce the
thickness of a single wooden sheet, it is preferable to select a film or paper as "a sheet member of
a material different from that of the wooden sheet", otherwise select the other materials
described above. Is preferred.
[0014]
In the case where the laminated sheet requires uniform strength in the vertical and horizontal
directions, for example, a woven fabric such as a biaxial woven fabric or a 4-axial woven fabric
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may be bonded to the wooden sheet. The woven fabric has an advantage that a lightweight and
rigid diaphragm can be easily obtained because it is easy to adjust the required part or axial
strength to a required size.
[0015]
The thickness of a single wooden sheet is preferably 0.005 mm to 3 mm which can be used as a
wooden sheet, but particularly 0.01 mm to 0.1 mm for small diaphragms for earphones and
headphones. Furthermore, 0.005 mm to less than 0.1 mm is a preferable range. As a normal
diaphragm, 0.01 mm to 0.3 mm, which is easy to manufacture by peeling or slicing a wig, is a
preferable range. 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. On the other hand, the thickness of the “sheet member made
of a material different from that of the wood sheet” may be adjusted, for example, in proportion
to the thickness of the wood sheet so as to be about one fifth of the thickness of the wood sheet.
preferable.
[0016]
When the bonded sheet containing the aqueous solution is formed into a predetermined shape, it
is temporarily formed by primary press heating and molding, and then a thermosetting resin is
included to be formed into a predetermined shape by secondary pressing heating and forming.
You may do it. When the thickness of the laminated sheet is increased, it is preferable to increase
the press pressure.
[0017]
According to the present invention, in addition to the water containing the penetrant and the
wetting agent intruding into the wood sheet to give the wood sheet elasticity, the effect of the
penetrant and the wetting agent to give more moisture to the wood sheet is provided. By exerting
it, a large elongation of the wooden sheet can be realized, so that the wooden sheet is less likely
to be broken in the mold at the time of press heating and forming, and the yield rate is improved.
In addition, the weight ratio of water, a penetrant, and a wetting agent is appropriately adjusted
in accordance with the degree of stretchability and moisture absorbability of the wooden sheet.
By stretching the wooden sheet substantially uniformly in the mold during press heating and
forming, a diaphragm for an electroacoustic transducer with a small variation in thickness
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throughout can be obtained, so electrics such as speakers, earphones, and headphones using this
can be obtained. The acoustic characteristics of the acoustic transducer are improved.
[0018]
Moreover, by bonding two wooden sheets together on both sides of sheet members other than
wooden sheets, deformation such as warping is less likely to occur, and the variation in thickness
is small throughout and the electro-acoustic transducer is excellent in strength. Since a
diaphragm is obtained, acoustic characteristics of an electroacoustic transducer such as a
speaker, an earphone, a headphone, etc. using the diaphragm are also improved.
[0019]
Furthermore, for example, a plurality of two types of wood sheets having different thicknesses
are prepared in advance as wood sheets, and two wood sheets having the same thickness or
different thicknesses are selected from the prepared sheets and then pasted together. A total of
three types of electroacoustic transducer diaphragms having different thicknesses can be
manufactured.
As described above, by changing the combination of the thicknesses of the two wooden sheets to
form a laminated sheet, it becomes possible to manufacture multiple types of diaphragms for
electroacoustic transducers having different thicknesses. The degree of freedom in design at the
time of board manufacture is increased, and productivity is improved.
[0020]
In addition, since both the penetrant and the wetting agent do not cause seizing in the mold for
press thermoforming, the decrease of the releasability of the work from the mold, the stain of the
work, the stain of the mold, etc. It does not occur. Therefore, the yield rate is improved, and since
the work of peeling off the baked products from the diaphragm and the mold is unnecessary, the
productivity is improved and the manufacturing cost is reduced.
[0021]
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Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a flowchart
showing a method of manufacturing a diaphragm for an electroacoustic transducer according to
the present invention, and FIG. 2 is an explanatory view of a first embodiment.
[0022]
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 made of wood having a thickness of
about 0.05 mm. The bonded sheet 1 having a thickness of about 0.6 mm is formed by sticking on
both surfaces of the sheet member (nonwoven fabric) 4 other than the sheets 2a and 2b via the
adhesive layers 3a and 3b.
[0023]
In addition, as the wood sheets 2a and 2b, hardwood-based wood and the like can be used, and in
particular, in consideration of the strength against a defect such as a crack and the sound
propagation characteristics, a brazing material, nara 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. In view of the adhesion to the wooden sheets 2a and 2b and the sound propagation
characteristics, as the adhesive layers 3a and 3b, for example, an emulsion adhesive is suitable.
[0024]
Next, in the immersion step 101 shown in FIG. 1, an aqueous solution 5 containing 0.05% by
weight of butyl naphthalene sulfonate sodium is prepared, and the bonded sheet 1 is cut to an
appropriate size, as shown in FIG. 2 (b) , Immersed in the aqueous solution 5.
[0025]
Next, in the primary press heating and forming step 102 shown in FIG. 1, the laminated sheet 1
exhibiting flexibility by immersion is placed in a mold 6 previously heated to 100 ° C. or higher,
as shown in FIG. And press heat molding.
The mold 6 is a male and female type consisting of a male mold 7 and a female mold 8 formed in
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a predetermined shape, and has heaters 9 and 10.
[0026]
In addition to the butyl naphthalene sulfonic acid soda entering into the wooden sheets 2a, 2 b to
give elasticity to the wooden sheets 2 a, 2 b, the action of sodium butyl naphthalene sulfonic acid
giving more moisture to the wooden sheets 2 a, 2 b By exerting the large expansion of the
wooden sheets 2 a and 2 b can be realized, the wooden sheets 2 a and 2 b are less likely to be
broken in the mold 6 at the time of press heating and forming.
[0027]
Further, since no lubricant is contained in the aqueous solution 5, no deposit is generated on the
mold 6 at the time of pressing, and the laminated sheet 1 does not burn on the mold 6, and
defects such as cracks are also generated. Good moldings are obtained.
[0028]
Next, in the thermosetting resin impregnating step 103 shown in FIG. 1, the molded product 12
obtained in the primary press heating and forming step 102 is dipped in the thermosetting resin
solution 11 as shown in FIG. 2 (d). .
At the same time, vibration by the ultrasonic transducer 13 is applied to the thermosetting resin
solution 11, and the thermosetting resin is immersed until the thermosetting resin sufficiently
penetrates into the molding 12 (about 5 minutes).
The immersion with the application of ultrasonic waves requires only about one tenth of the time
required for the thermosetting resin to fully penetrate, as compared with the case without the
application of ultrasonic waves.
[0029]
Next, in the drying step 104 shown in FIG. 1, the molded product 12 into which the
thermosetting resin has penetrated is forcedly dried while blowing air from the fan 14 at normal
temperature as shown in FIG. 2 (e).
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[0030]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 6 shown in
FIG. 2C is previously heated to 150 ° C. or more, and the press heating and forming is
performed again on the molded product 12.
[0031]
As described above, after the thermosetting resin is impregnated into the molded product 12
molded into the diaphragm shape in the primary press heating and forming step 102 and the
thermosetting resin is disposed on the inside and the surface of the molded product 12. By
performing press heat forming again in the secondary press heat forming step 105, the shape
retention property of the formed product 12 is improved and it becomes difficult to return to the
shape before forming, so that the yield rate is improved.
[0032]
Next, in a forming step 106 shown in FIG. 1, a punching process is performed to form a central
hole in the formed product 12 and to form the formed product 12 into a predetermined outer
diameter by 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. 2F, a trumpet-shaped molded article 12 (speaker diaphragm) in
which the central hole 15 is formed is obtained.
[0033]
Next, a method of manufacturing a diaphragm for an electroacoustic transducer according to a
second embodiment of the present invention will be described based on FIGS. 1 and 3. FIG.
[0034]
First, in the laminated 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 made of sheet members (Japanese
paper) other than wooden sheets A bonded sheet 16 is formed by bonding on both surfaces 19
of each other via adhesive layers 18a and 18b.
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[0035]
As the wood sheets 17a and 17b, hardwood-based wood and the like can be used. In particular,
in consideration of the strength against a defect such as a crack at the time of manufacture and
the sound propagation characteristics, wood and wood are preferable.
As the adhesive layers 18a and 18b, a water-soluble adhesive, an emulsion adhesive, or the like
can be used.
An emulsion adhesive or the like is preferable as the adhesive layers 18a and 18b, in
consideration of the adhesion to the wooden sheets 17a and 17b and the sound propagation
characteristics.
[0036]
Next, in the immersion step 101 shown in FIG. 1, an aqueous solution 20 containing 5% by
weight of ethylene glycol and 0.1% by weight of sodium didiethylhexylsulfosuccinate is prepared,
and the laminated sheet 16 is cut to an appropriate size, It is immersed in an aqueous solution 20
as shown in FIG.
Then, the laminated sheet 16 is dipped until it is soft (about 20 minutes). In FIG. 3B, some ethyl
alcohol is dissolved in the aqueous solution 20 in order to accelerate the drying time of the work.
[0037]
Next, in the primary press heating and forming step 102 shown in FIG. 1, as shown in FIG. 3 (c),
the flexible laminated sheet 16 is pressed and heated by the mold 21 previously heated to 100
° C. or higher. To mold. The mold 21 is a male and female type consisting of a male mold 22
and a female mold 23 formed in a predetermined shape, and has heaters 24 and 25. At the time
of this pressing, since no lubricant is contained in the aqueous solution 20, no deposit is
generated on the mold 21, and the laminated sheet 16 does not burn on the mold 21 and there is
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no defect such as cracking. Good moldings were obtained.
[0038]
Next, in the thermosetting resin impregnating step 103 shown in FIG. 1, the molded product 26
obtained in the primary press heating and forming step 102 is immersed in the thermosetting
resin solution 27 as shown in FIG. 3 (d). At the same time, vibration is applied by the ultrasonic
transducer 28 a to the thermosetting resin solution 27, and the thermosetting resin is immersed
until the thermosetting resin penetrates into the molding 26 sufficiently (about 5 minutes). The
immersion with the application of ultrasonic waves requires only about one tenth of the time
required for the thermosetting resin to fully penetrate, as compared with the case without the
application of ultrasonic waves. The molded product 26 thus obtained was observed by leaving it
for 24 hours in an atmosphere at a temperature of 60 ° C. and a relative humidity of 90%. As a
result, it was found that deformation was significantly less than that without using ultrasonic
waves. The
[0039]
Next, in the drying step 104 shown in FIG. 1, as shown in FIG. 3 (e), the molded product 26 in
which the thermosetting resin penetrates is forcedly dried while blowing a wind with a fan 28b
at normal temperature. The forced drying with normal temperature wind is about one tenth the
failure rate of cracking in the secondary press heating and forming step 105 in the next step, as
compared to the method using high temperature wind (for example, an infrared lamp or hot air
forced drying) It turned out that it can be suppressed.
[0040]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 21 shown
in FIG. 3C is previously heated to 150 ° C. or higher, and the press heating and forming is
performed on the formed product 26 again.
[0041]
As described above, after the thermosetting resin is impregnated into the molded product 26
formed into the diaphragm shape in the primary press heating and forming step 102 and the
thermosetting resin is disposed on the inside and the surface of the molded product 26. By
performing press heat forming again in the secondary press heat forming step 105, the shape
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retention property of the formed product 26 is improved and it becomes difficult to return to the
shape before forming, so that the yield rate is improved.
[0042]
Then, in the forming step 106 shown in FIG. 1, after forming a central hole in the formed product
26 and performing a punching process to form the formed product 26 into a predetermined
outer diameter dimension using a punching die of a predetermined shape, The plastic resin.
As a result, as shown in FIG. 3F, a trumpet-shaped molded product 26 (speaker diaphragm)
having the central hole 26a is obtained.
[0043]
Next, a method of manufacturing a diaphragm for an electric converter according to a third
embodiment of the present invention will be described based on FIGS. 1 and 4.
[0044]
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 attached via the adhesive layers 30a
and 30b. It sticks on both surfaces of sheet members (nonwoven fabric) 31 other than a wooden
sheet whose thickness is about 0.1 mm, and forms a bonding sheet 28 having a thickness of
about 1.2 mm.
As the wood sheets 29a and 29b, hardwood-based wood and the like can be used, and in
particular, in consideration of the strength against a defect such as a crack at the time of
manufacture and the sound propagation characteristics, a brazing material, nara wood and the
like are preferable.
As the adhesive layers 30a and 30b, a water-soluble adhesive, an emulsion adhesive, or the like
can be used. An emulsion adhesive or the like is preferable as the adhesive layers 30a and 30b,
in consideration of the adhesion to the wooden sheets 29a and 29b and the sound propagation
characteristics.
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[0045]
Next, in the immersion step 101 shown in FIG. 1, an aqueous solution 32 containing 0.1% by
weight of di (2-ethylhexyl sulfosuccinic acid ester soda) is prepared, and a bonded sheet 28 cut
to an appropriate size is shown in FIG. , Immersed in an aqueous solution 32. Then, the laminated
sheet 16 is dipped until it is soft (about 20 minutes).
[0046]
Next, in the primary press heating and forming step 102 shown in FIG. 1, as shown in FIG. 4 (c),
the flexible laminated sheet 28 is pressed and heated by the mold 33 previously heated to 100
° C. or higher. To mold. The mold 33 is a male and female type consisting of a male mold 34
and a female mold 35 formed in a predetermined shape, and has heaters 36 and 37. At the time
of this pressing, since no lubricant is contained in the aqueous solution 32, no deposit is
generated on the mold 33, and the laminated sheet 28 does not burn on the mold 33 and there is
no defect such as cracking. Good moldings were obtained.
[0047]
Next, in the thermosetting resin impregnating step 103 shown in FIG. 1, the molded product 38
obtained in the primary press heating and forming step 102 is dipped in the thermosetting resin
solution 39 as shown in FIG. 4 (d). . Soak until the thermosetting resin fully penetrates the
molding 38 (about 60 minutes).
[0048]
Next, in the drying step 104 shown in FIG. 1, the molded article 38 in which the thermosetting
resin has penetrated is forcedly dried while blowing a wind with a fan 40 at normal temperature
as shown in FIG. 4 (e). The forced drying with normal temperature wind is about one tenth the
failure rate of cracking in the secondary press heating and forming step 105 in the next step, as
compared to the method using high temperature wind (for example, an infrared lamp or hot air
forced drying) It turned out that it can be suppressed.
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[0049]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 33 shown
in FIG. 4C is previously heated to 150 ° C. or higher, and press heating and forming are
performed again on the formed product 38.
[0050]
As described above, after the thermosetting resin is impregnated into the molded product 38
molded into the diaphragm shape in the primary press heating and molding step 102 and the
thermosetting resin is disposed on the inside and the surface of the molded product 38. By
performing press thermal molding again, the shape retention property 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.
[0051]
Then, in the forming step 106 shown in FIG. 1, after the center hole 41 is formed in the formed
product 38 and the formed product 38 is formed to have a predetermined outer diameter by
using a punching die having a predetermined shape, Coating with moisture resistant resin.
As a result, as shown in FIG. 4 (f), a trumpet-shaped molding 38 in which the central hole 41 is
formed is obtained.
[0052]
Also in the present embodiment, the same effects as those of the first embodiment can be
obtained.
[0053]
Next, a method of manufacturing a diaphragm for an electroacoustic transducer according to a
fourth embodiment of the present invention will be described based on FIG. 1 and FIG.
[0054]
First, in the bonded sheet forming step 100 shown in FIG. 1, as shown in FIG. 5A, two wooden
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sheets 43a and 43b having a thickness of about 0.25 mm and two sheets having a thickness of
about 0.05 mm The laminated sheet 42 is formed by alternately adhering sheet members (nonwoven fabrics) 45a and 45b other than the above-mentioned wooden sheet via the adhesive
layers 44a, 44b and 44c.
[0055]
As the wood sheets 43a and 43b, hardwood-based wood and the like can be used, and in
particular, in consideration of the strength against a defect such as a crack at the time of
manufacture and the sound propagation characteristics, a brazing material, nara wood and the
like are preferable.
As the adhesive layer 44a, 44b, 44c, a water-soluble adhesive, an emulsion adhesive or the like
can be used.
In view of the adhesion to the wooden sheets 43a and 43b and the sound propagation
characteristics, emulsion adhesives and the like are suitable as the adhesive layers 44a, 44b and
44c.
[0056]
Next, in the immersion step 101 shown in FIG. 1, an aqueous solution 46 containing 10% by
weight of ethyl alcohol and 0.05% by weight of 2-ethylhexyl sulfosuccinic acid soda is prepared,
and the bonded sheet 42 is cut to an appropriate size. Immerse in the aqueous solution 46 as
shown in (b).
Then, the laminated sheet 42 is dipped until it is soft (about 20 minutes).
[0057]
Next, in the primary press heating and forming step 102 shown in FIG. 1, as shown in FIG. 5 (c),
the flexible laminated sheet 42 is pressed and heated by a die 47 previously heated to 100 ° C.
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or higher. To mold.
The mold 47 is 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 deposit is generated on the mold 47, and
the laminated sheet 42 is not burned onto the mold 47. In addition, the reinforcing effect of the
non-woven fabrics 45a and 45b provided on both sides of the laminated sheet 42 makes the
process highly productive without cracking defects.
[0058]
Next, in the thermosetting resin impregnating step 103 shown in FIG. 1, the molded product 52
obtained in the primary press heating and forming step 102 is immersed in the thermosetting
resin solution 53 as shown in FIG. 5 (d). . At the same time, the vibration of the ultrasonic
transducer 54 is applied to the thermosetting resin solution 53, and the solution is immersed
until the thermosetting resin penetrates sufficiently (about 5 minutes). The immersion with the
application of ultrasonic waves requires only about one tenth of the time required for the
thermosetting resin to fully penetrate, as compared with the case without the application of
ultrasonic waves.
[0059]
Next, in the drying step 104 shown in FIG. 1, the molded article 52 into which the thermosetting
resin has penetrated is forcedly dried while blowing a wind with a fan 55 at normal temperature
as shown in FIG. 5 (e).
[0060]
Next, in the secondary press heating and forming process 105 shown in FIG. 1, the mold 47
shown in FIG. 5C is previously heated to 150 ° C. or higher, and the press heating and forming
is performed on the formed product 52 again.
[0061]
As described above, after the thermosetting resin is impregnated into the molded product 52
molded into the diaphragm shape in the primary press heating and forming step 102 and the
thermosetting resin is disposed on the inside and the surface of the molded product 52. By
performing press heat forming again, the shape retention property of the formed product 52 is
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improved and it becomes difficult to return to the shape before forming, so that the yield rate is
improved.
[0062]
Then, in the forming step 106 shown in FIG. 1, after forming a central hole in the formed product
52 and performing a punching process for forming the formed product 52 into a predetermined
outer diameter size using a punching die of a predetermined shape, The plastic resin.
As a result, as shown in FIG. 5F, a trumpet-shaped molded article 52 (speaker diaphragm) in
which the central hole 56 is formed is obtained.
In addition, the heat resistant wood grain printing may be performed in advance on the surface
of the non-woven fabric 45a on the inner side, thereby meeting the needs of people who prefer
the wood grain appearance.
[0063]
Next, a method of manufacturing a diaphragm for an electroacoustic transducer according to a
fifth embodiment of the present invention will be described based on FIG. 1 and FIG.
[0064]
First, in the bonded sheet forming step 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 attached via the adhesive layers
59a and 59b. The sheet members (non-woven fabric) 60 having a thickness of about 0.05 mm
and made of a material different from that of the wooden sheets 58a and 58b are respectively
bonded.
A sheet member (non-woven fabric) 73 made of a material different from that of the wooden
sheets 58a and 58b is attached to the other surface of the wooden sheet 58b, one of which is
adhered to the adhesive layer 59b, via the spot adhesive layer 72. As a result, the bonded sheet
57 is formed.
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[0065]
As the wood sheets 58a and 58b, hardwood-based wood and the like can be used. In particular,
in consideration of the strength against a defect such as a crack at the time of manufacture and
the sound propagation characteristics, a lumber and a larch 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 non-woven fabrics 60 and 73 can be, for example, 0.01 to 0.1
mm.
[0066]
Next, in the immersion 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 bonded
sheet 57 is cut to an appropriate size, as shown in FIG. It is immersed in this aqueous solution 61
as shown in FIG. Then, the laminated sheet 57 is immersed until it is soft (about 20 minutes).
[0067]
Next, in the primary press heating and forming step 102 shown in FIG. 1, as shown in FIG. 6 (c),
the flexible laminated sheet 57 is pressed and heated by the mold 62 previously heated to 100
° C. or higher. To mold. The mold 62 is 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 laminated sheet 57 is not burned onto the mold 62. In
addition, the reinforcing effect of the non-woven fabrics 60 and 73 provided on both sides of the
bonded sheet 57 makes the process highly productive without cracking defects. After press
heating and forming, the non-woven fabric 73 spot-bonded to the inner surface is peeled off from
the wooden sheet 58b.
[0068]
11-05-2019
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Next, in the thermosetting resin impregnating step 103 shown in FIG. 1, the molding 67 formed
in the primary press heating and forming step 102 and from which the non-woven fabric 73 is
peeled is shown in FIG. Immerse in resin solution 68. At the same time, the vibration of the
ultrasonic transducer 69 is applied to the thermosetting resin solution 68, and the solution is
immersed until the thermosetting resin penetrates sufficiently (about 5 minutes). The immersion
with the application of ultrasonic waves requires only about one tenth of the time required for
the thermosetting resin to fully penetrate, as compared with the case without the application of
ultrasonic waves.
[0069]
Next, in the drying step 104 shown in FIG. 1, the molded product 67 into which the
thermosetting resin has penetrated is forcedly dried while blowing a wind with a fan 70 at
normal temperature as shown in FIG. 6 (e).
[0070]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 62 shown
in FIG. 6C is previously heated to 150 ° C. or higher, and press heating and forming are
performed on the formed product 67 again.
[0071]
As described above, after the thermosetting resin is impregnated into the molded product 67
molded into the diaphragm shape in the primary press heating and forming step 102 and the
thermosetting resin is disposed on the inside and the surface of the molded product 67. By
performing press thermal molding again, the shape retention property of the molded product 67
is improved and it becomes difficult to return to the shape before molding, so that the yield rate
is improved.
[0072]
Then, in the forming step 106 shown in FIG. 1, after forming a center hole in the formed product
67 and performing a punching process to form the formed product 67 into a predetermined
outer diameter size using a punching die of a predetermined shape, The plastic resin.
As a result, as shown in FIG. 6F, a trumpet-shaped molded product 67 (speaker diaphragm) in
which the central hole 71 is formed is obtained.
11-05-2019
19
[0073]
Next, a method of manufacturing a diaphragm for an electroacoustic transducer according to a
sixth embodiment of the present invention will be described based on FIGS. 1 and 7.
[0074]
First, in the laminated 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 made of different materials from
the wooden sheets 75a and 75b. A bonded sheet 57 is formed on each side of the sheet member
(four-axis woven fabric) 77 of FIG.
[0075]
Next, in the immersion step 101 shown in FIG. 1, an aqueous solution 78 containing 5% by
weight of glucose and 0.05% by weight of 2-ethylhexyl sulfosuccinic acid soda is prepared, and
the laminated sheet 74 is cut to an appropriate size. Immerse in an aqueous solution 78 as
shown in (b).
Then, the laminated sheet 74 is dipped until it is soft (about 20 minutes).
[0076]
Next, in the primary press heating and forming step 102 shown in FIG. 1, as shown in FIG. 7 (c),
the flexible laminated sheet 74 is pressed and heated by a mold 79 previously heated to 100 °
C. or higher. To mold.
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 deposit
is generated on the mold 79, and the laminated sheet 74 is not burned onto the mold 79.
11-05-2019
20
In addition, since reinforcement in the vertical and horizontal directions is obtained by the fouraxis woven fabric 77 provided on one side of the laminated sheet 74, the process has a high
productivity with no cracking failure.
[0077]
Next, in the thermosetting resin impregnating step 103 shown in FIG. 1, the molded product 84
obtained in the primary press heating and forming step 102 is immersed in the thermosetting
resin solution 85 as shown in FIG. 7 (d). . At the same time, the vibration of the ultrasonic
vibrator 86 is applied to the thermosetting resin solution 85, and the solution is immersed until
the thermosetting resin penetrates sufficiently (about 5 minutes). The immersion with the
application of ultrasonic waves requires only about one tenth of the time required for the
thermosetting resin to fully penetrate, as compared with the case without the application of
ultrasonic waves.
[0078]
Next, in the drying step 104 shown in FIG. 1, the molded article 84 in which the thermosetting
resin has penetrated is forcedly dried while blowing a wind with a fan 87 at normal temperature
as shown in FIG. 7 (e).
[0079]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 79 shown
in FIG. 7C is previously heated to 150 ° C. or higher, and press heating and forming are
performed again on the formed product 84.
[0080]
As described above, after the thermosetting resin is impregnated into the molded product 84
molded into the diaphragm shape in the primary press heating and molding step 102 and the
thermosetting resin is disposed on the inside and the surface of the molded product 84. By
performing press heat forming again, the shape retention property of the formed product 84 is
improved and it becomes difficult to return to the shape before forming, so that the yield rate is
improved.
[0081]
11-05-2019
21
Then, in the forming step 106 shown in FIG. 1, after forming a central hole in the formed product
84 and performing a punching process to form the formed product 84 into a specified outer
diameter dimension using a punching die having a predetermined shape, The plastic resin.
As a result, as shown in FIG. 7F, a trumpet-shaped molded article 84 (speaker diaphragm) in
which the central hole 88 is formed is obtained.
[0082]
Next, a method of manufacturing a diaphragm for an electroacoustic transducer according to a
seventh embodiment of the present invention will be described based on FIGS. 1 and 2. FIG.
[0083]
First, in the bonded sheet forming step 100 shown in FIG. 1, as shown in FIG. 2A, two wooden
sheets 2a and 2b having a thickness of about 0.25 mm are attached via the adhesive layers 3a
and 3b. The laminated sheet 1 is formed on each side of the non-woven fabric 4 which is a sheet
member of a material different from that of the wooden sheets 2a and 2b.
[0084]
Next, in the immersion step 101 shown in FIG. 1, an aqueous solution containing 0.05% by
weight of butyl naphthalene sulfonate sodium is prepared, and the bonded sheet 1 is cut to an
appropriate size, as shown in FIG. Immerse in this aqueous solution 5.
Then, the laminated sheet 1 is dipped until it becomes flexible (about 20 minutes).
The butyl naphthalene sulfonate sodium is a kind of sodium alkyl naphthalene sulfonate and is a
penetrant.
Moreover, the nonwoven fabric 4 can have a role of a reinforcing material which reinforces the
strength of the wooden sheets 2a and 2b.
11-05-2019
22
For example, the non-woven fabric 4 is a paper made by weaving yarn made of paper pulp.
[0085]
Next, in the primary press heating and forming step 102 shown in FIG. 1, as shown in FIG. 2 (c),
the flexible laminated sheet 1 is pressed and heated by the mold 6 previously heated to 100 ° C.
or higher. To mold. 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.
[0086]
In addition to the butyl naphthalene sulfonic acid soda entering into the wooden sheets 2a, 2 b to
give elasticity to the wooden sheets 2 a, 2 b, the action of sodium butyl naphthalene sulfonic acid
giving more moisture to the wooden sheets 2 a, 2 b By exerting the large expansion of the
wooden sheets 2 a and 2 b can be realized, the wooden sheets 2 a and 2 b are less likely to be
broken in the mold 6 at the time of press heating and forming.
[0087]
Further, since no lubricant is contained in the aqueous solution 5, no deposit is generated on the
mold 6 at the time of pressing, and the laminated sheet 1 does not burn on the mold 6, and
defects such as cracks are also generated. Not a good molding was obtained.
[0088]
Next, in the thermosetting resin impregnating step 103 shown in FIG. 1, the molded product 12
obtained in the primary press heating and forming step 102 is dipped in the thermosetting resin
solution 11 as shown in FIG. 2 (d). .
At the same time, the vibration of the ultrasonic transducer 13 is applied to the thermosetting
resin solution 11, and the solution is immersed until the thermosetting resin fully penetrates
(about 5 minutes).
The immersion with the application of ultrasonic waves requires only about one tenth of the time
11-05-2019
23
required for the thermosetting resin to fully penetrate, as compared with the case without the
application of ultrasonic waves.
[0089]
Next, in the drying step 104 shown in FIG. 1, the molded product 12 into which the
thermosetting resin has penetrated is forcedly dried while blowing air from the fan 14 at normal
temperature as shown in FIG. 2 (e).
[0090]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 6 shown in
FIG. 2C is previously heated to 150 ° C. or more, and the press heating and forming is
performed again on the molded product 12.
[0091]
As described above, after the thermosetting resin is impregnated into the molded product 12
molded into the diaphragm shape in the primary press heating and forming step 102 and the
thermosetting resin is disposed on the inside and the surface of the molded product 12 By
performing press heat forming again in the secondary press heat forming step 105, the shape
retention property of the formed product 12 is improved and it becomes difficult to return to the
shape before forming, so that the yield rate is improved.
[0092]
Next, in a forming step 106 shown in FIG. 1, a punching process is performed to form the formed
article 12 into a predetermined outer diameter size on the formed article 12 using a punching die
having a predetermined shape.
Then, the molded product 12 is coated with a moisture resistant resin.
As a result, unlike in FIG. 2F, a small diaphragm 804 for earphones or headphones in which the
central hole 15 is not formed is formed.
The obtained diaphragm 804 is shown to Fig.9 (a).
11-05-2019
24
[0093]
Next, a method of manufacturing a diaphragm for an electroacoustic transducer according to an
eighth embodiment of the present invention will be described based on FIGS. 1 and 3. FIG.
[0094]
First, in the immersion 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 not attached to the wooden sheets via the
adhesive layers 18a and 18b. The laminated sheet 16 is formed by laminating on both sides of
the sheet member (Japanese paper) 19 of FIG.
[0095]
Next, in the immersion step 101 shown in FIG. 1, an aqueous solution 20 containing 5% by
weight of ethylene glycol and 0.1% by weight of sodium didiethylhexylsulfosuccinate is prepared,
and the bonded sheet 16 is cut into appropriate dimensions. As shown in FIG. 3 (b), it is
immersed in an aqueous solution 20.
Then, the laminated sheet 16 is dipped until it is soft (about 20 minutes).
In order to accelerate the drying time of the work, some ethyl alcohol was dissolved in the
aqueous solution 20. Here, ethylene glycol and ethyl alcohol are wetting agents, and sodium
didiethylhexyl sulfosuccinic acid ester is a kind of dialkyl sulfosuccinic acid ester salt and a
penetrant. Moreover, the sheet member 19 can have a role of a reinforcing material which
reinforces the strength of the wooden sheets 2a and 2b. For example, the sheet member 19 is a
non-woven fabric or a four-axis woven fabric.
[0096]
Next, in the primary press heating and forming step 102 shown in FIG. 1, as shown in FIG. 3 (c),
the flexible laminated sheet 16 is pressed and heated by the mold 21 previously heated to 100
° C. or higher. To mold. The mold 21 is a male and female type consisting of a male mold 22
and a female mold 23 formed in a predetermined shape, and has heaters 24 and 25. At the time
11-05-2019
25
of this pressing, since no lubricant is contained in the aqueous solution 20, no deposit is
generated on the mold 21, and the laminated sheet 16 does not burn on the mold 21 and there is
no defect such as cracking. Good moldings were obtained.
[0097]
Next, in the thermosetting resin impregnating step 103 shown in FIG. 1, the molded product 26
obtained in the primary press heating and forming step 102 is immersed in the thermosetting
resin solution 27 as shown in FIG. 3 (d). At the same time, the vibration of the ultrasonic
transducer 28a is applied to the thermosetting resin solution 27, and the solution is immersed
until the thermosetting resin penetrates sufficiently (about 5 minutes). The immersion with the
application of ultrasonic waves requires only about one tenth of the time required for the
thermosetting resin to fully penetrate, as compared with the case without the application of
ultrasonic waves. The molded product 26 thus obtained was observed by leaving it for 24 hours
in an atmosphere with a temperature of 60 ° C. and a relative humidity of 90%. As a result, it
was found that deformation was significantly less than that without using ultrasonic waves. .
[0098]
Next, in the drying step 104 shown in FIG. 1, as shown in FIG. 3 (e), the molded product 26 in
which the thermosetting resin penetrates is forcedly dried while blowing a wind with a fan 28b
at normal temperature. The forced drying with normal temperature wind can suppress the defect
rate of cracking in the next step by press heating and molding to about 1/10 compared to the
method using high temperature wind (for example, infrared lamp and hot air forced drying) all
right.
[0099]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 21 shown
in FIG. 3C is previously heated to 150 ° C. or higher, and the press heating and forming is
performed on the formed product 26 again.
[0100]
As described above, after the thermosetting resin is impregnated into the molded product 26
molded into the diaphragm shape in the primary press heating and forming step 102 and the
thermosetting resin is disposed on the inside and the surface of the molded product 12. By
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26
performing press heat forming again in the secondary press heat forming step 105, the shape
retention property of the formed product 26 is improved and it becomes difficult to return to the
shape before forming, so that the yield rate is improved.
[0101]
Then, in a forming step 106 shown in FIG. 1, a punching process of forming the formed product
26 into a predetermined outer diameter dimension is performed using a punching die having a
predetermined shape, and then a moisture resistant resin is coated.
As a result, unlike in FIG. 3F, a small diaphragm 804 for earphones or headphones in which the
central hole 26a is not formed is formed.
The diaphragm 804 is shown in FIG. 9 (a).
[0102]
In the first to seventh embodiments, the thicknesses of the two wooden sheets do not have to be
the same. For example, one of them 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 types of wooden sheets
having different thicknesses are prepared in advance. Then, by combining two wooden sheets of
the required thickness from among a plurality of wooden sheets to produce the bonded sheet 1,
the diaphragms for electroacoustic transducers having different thicknesses are 3 in all. Kind, can
be manufactured. By manufacturing three types, the number of types of electroacoustic
transducer diaphragms that can be manufactured in sizes suitable for the respective thicknesses
can be increased, and therefore, the productivity is improved.
[0103]
Alternatively, a plurality of wood sheets having three different thicknesses, for example, 0.2 mm
thickness, 0.3 mm thickness, and 0.45 mm thickness wood sheets are prepared in advance as
wood sheets. Then, from among the prepared wooden sheets, by combining two wooden sheets
of the same thickness or wooden sheets of different thicknesses, a total of six types of
11-05-2019
27
diaphragms for electroacoustic transducers having different thicknesses are manufactured. it can.
As described above, as wooden sheets of various thicknesses are prepared, various diaphragms
for electro-acoustic transducers having suitable thicknesses can be produced as needed.
Therefore, at the time of manufacturing the diaphragms for electro-acoustic transducers Degree
of freedom increases.
[0104]
Of course, in the diaphragm for electro-acoustic transducer shown in the eighth embodiment, the
thicknesses of the two wooden sheets 2a and 2b may not be the same. For example, wooden
sheets of 0.025 mm thickness, 0.035 mm thickness, and 0.045 mm thickness are prepared in
advance, and in the bonding sheet forming step 100, if the wood sheets are combined according
to the required thickness, the thicknesses are respectively obtained. Six different types of
electroacoustic transducer diaphragms can be manufactured.
[0105]
In the wood sheets shown in the first to seventh embodiments, the surface on which the liquid is
most easily immersed is a cross section (cut), and is immersed 10 times faster than the surface.
For this reason, when it is desired to make the thickness of the wood sheet thicker than the
thickness of the wood sheet shown in the first to seventh embodiments, for example, about 10 to
20% of the immersion in the immersion step 101 according to the increase in thickness. It is
desirable to increase the time.
[0106]
(Structure of Speaker) FIG. 8 is a cross-sectional view of a speaker using the diaphragm for an
electroacoustic transducer according to the first to sixth embodiments. In this speaker 700, a
rubber edge 702 of a predetermined shape is bonded over the entire periphery to the outer
peripheral portion of the trumpet-shaped speaker diaphragm 701 manufactured by the
manufacturing method according to any one of the first to sixth embodiments. A bobbin of a
voice coil 703 of a predetermined shape (in which a predetermined damper 704 is bonded in
advance) is inserted and bonded to the center hole of the speaker diaphragm 701.
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[0107]
These three integrated parts are adhesively attached to a predetermined speaker housing 705
(predetermined magnetic circuit 706 is installed). A conductive metal wire (not shown) is drawn
out of the voice coil 703 and connected to a terminal (not shown, previously insulated with the
metal housing 705) attached to the housing 705. It is done.
[0108]
The magnetic circuit 706 includes a doughnut-shaped plate 707, a doughnut-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, a 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 arrowhead that holds
the end of the edge 702.
[0109]
In the speaker 700, the thickness of the speaker diaphragm 701 formed of a wooden sheet was
substantially uniform, and excellent acoustic characteristics with less distortion were obtained.
[0110]
The speaker diaphragm formed of the wooden sheet can reproduce reproduced sound close to
natural sound, and in particular, can reproduce middle and high sound such as human voice,
violin sound and the like, and the appearance with high texture Therefore, it can be adopted as a
high-quality audio device, a high-quality home theater system, a monitor of a broadcasting
station, etc., which require high-quality sound quality and high-quality appearance.
[0111]
(Configuration of Earphone or Headphone) FIG. 9A is a cross-sectional view showing an example
of applying the diaphragm according to the seventh and eighth embodiments to the earphone or
headphone.
[0112]
11-05-2019
29
In FIG. 9A, the outer peripheral portion of a dome-shaped diaphragm 804 made of wooden
sheets 803a and 803b manufactured by any of the manufacturing methods shown in the seventh
and eighth embodiments and a sheet member 802 other than the wooden sheet. Then, an edge
801 of a predetermined shape is bonded over the entire circumference.
The edge 801 is made of rubber or soft plastic film.
[0113]
FIG. 9 (b) 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 of a
predetermined shape is adhered to the central portion of the diaphragm according to the seventh
and eighth embodiments. There is.
An outer peripheral portion of the diaphragm 804 is adhered to a housing 816 which constitutes
a part of the back air chamber 809, and the diaphragm 804 is fixed to the housing 816. When
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, and eventually, The information as a change in current is
the movement of the diaphragm 804, which vibrates the surrounding air and becomes a sound
having information. Sound passes through the ear canal 813 to the ear (not shown). At that time,
an air pad 812 is provided in order to prevent the diffusion of sound to other than the ear and to
block the noise from the outside, thereby enhancing the adhesion between the side of the face
and the headphone 800. In order to make the vibration of the diaphragm 804 smoother and to
control the movement of the air on the rear surface of the diaphragm 804, a back electrode air
chamber 810, a back 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 air chamber
811 is provided, and a large number of front leakage holes 808 are provided in the protective
material 823 and the protective edge 822.
[0114]
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30
When the diaphragm 804 shown in FIG. 9A is applied to the earphone, the structure of 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.
[0115]
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 diaphragm 904 is adhered
to a housing 916 which constitutes a part of the back air chamber 909, and the diaphragm 904
is fixed to the housing 916. When current flows in the voice coil 906 on the permanent magnet
905 side, a mechanical driving force is generated in the voice coil 906, the driving force is
transmitted to the diaphragm 904 through the voice coil bobbin 906, and eventually, The
information as the change of the current is the movement as the vibration of the diaphragm 904,
which vibrates the surrounding air and becomes a sound having information. Sound passes
through the ear canal 913 to the ear (not shown). Further, an earhole protrusion 917 is provided
on the front of the earhole in front of the diaphragm 904, and a through hole through which
sound passes is provided in the central portion thereof. By inserting this ear canal projection 917
into the ear canal, it is possible to prevent the diffusion of sound to the outside of the ear and to
prevent external noise.
[0116]
In order to make the vibration of the diaphragm 904 smoother and to control the movement of
the air on the rear surface of the diaphragm 904, a back electrode air chamber 910, a back
leakage hole 907, and a back air chamber 909 are provided. Also, in order to control the
movement of the entire surface of the diaphragm 904, a front air chamber 911 is provided, and a
large number of front leakage holes 908 are provided in the protective material 923 and the
protective edge 922.
[0117]
In addition, the said speaker, a headphone, and an earphone are also called an electroacoustic
transducer. The electroacoustic transducer further includes a buzzer and the like in addition to
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31
the above embodiment.
[0118]
Of course, in the headphone using the diaphragm according to the seventh and eighth
embodiments, the sizes of the two wooden sheets 803a and 803b may not be the same. For
example, the wooden sheet 803a has a diameter of 3 mm, and the wooden sheet 803b has a
diameter of 1.5 mm in advance, and the laminated sheet forming process 100 is performed by
combining the wooden sheets by aligning the centers. The electroacoustic transducer diaphragm
804 can be manufactured by combining two types of wooden sheets 803 a and 803 b having
different resonance frequencies on the sheet member 802. In this case, the sheet member 802 is
made of rubber or a soft plastic film so as to be integrated with the edge 801 and the outer
dimensions of the molding 26 in the molding step 106 include the edge 801. As a result, there is
an effect that adhesion between the sheet member 802 and the edge 801 can be omitted.
[0119]
According to the manufacturing method of the present invention, it is possible to manufacture
this type of electroacoustic transducer diaphragm at a lower cost, so it is possible to use low-cost
stationary audio equipment as well as the above-mentioned expensive products. It can also be
used for portable audio devices and the like.
[0120]
Further, according to the manufacturing method of the present invention, since the stretchability
of the wooden sheet is improved, it can be processed into a complicated shape, and a highly
fashionable product requiring a variety of shapes and space requirements However, it can be
adopted even for compact products that are strict.
[0121]
Therefore, it can be said that it is extremely useful because great satisfaction can be obtained in
all products.
[0122]
The present invention is not limited to the above embodiments, and various modifications can be
made to the above embodiments without departing from the scope of the present invention.
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32
[0123]
It is explanatory drawing of the manufacturing method of the diaphragm for electroacoustic
transducers of this invention.
It is an explanatory view of a 1st embodiment of the present 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 using the diaphragm for electroacoustic
transducers by the manufacturing method of this invention. It is sectional drawing of one
Embodiment of the earphone which used the diaphragm for electroacoustic transducers which
concerns on the 7th and 8th Example of this invention, or a headphone.
Explanation of sign
[0124]
DESCRIPTION OF SYMBOLS 1 ... Bonding sheet 2a, 2b ... Wooden sheet 3a, 3b ... Adhesive
material layer 4 ... Non-woven fabric 5 ... Aqueous solution 6 ... Mold 7 ... Male type 8 ... Female
type 9 ... Heater 11 ... Thermosetting resin solution 12 ... Molding 13 ultrasonic transducer 14
fan 15 central hole 16 sheet 17a, 17b wooden sheet 18a, 18b adhesive layer 19 sheet member
20 aqueous solution 21 mold 22 male 22 male 24 female 24 Heaters 26: moldings 26a: central
holes 27: thermosetting resin solution 28a: ultrasonic vibrator 28b: fan 29a, 29b: wooden sheet
30a, 30b: adhesive layer 32: aqueous solution 33: mold 34: male mold 35: male mold 35 ...
female mold 36 ... heater 38 ... molded article 39 ... thermosetting resin solution 40 ... fan 41 ...
center hole 42 ... sheet 43a, 43b ... wooden sheet 44a, 44b, 44c ... adhesive layer 5a, 45b ... nonwoven fabric 46 ... aqueous solution 47 ... mold 48 ... male mold 49 ... female mold 50 ... heater
52 ... molded article 53 ... thermosetting resin solution 54 ... ultrasonic transducer 55 ... fan 56 ...
center hole 57 ... paste Laminated sheet 58a, 58b ... wooden sheet 59a, 59b ... adhesive layer 60
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... non-woven fabric 61 ... aqueous solution 62 ... mold 63 ... male mold 64 ... female mold 65 ...
heater 67 ... molded article 68 ... thermosetting resin solution 69 ... super Sound wave oscillator
70 Fan 71 center adhesive layer 73 adhesive layer 73 non-woven fabric 74 laminated sheet 75a,
75b wood sheet 76a, 76b adhesive layer 78 aqueous solution 79 mold 80 male type 81 female
Type 82: Heater 84: Molding 85: Thermosetting resin solution 86: Ultrasonic transducer 87: Fan
88: Center hole 701: Diaphragm for diaphragm 702: Rubber edge 7 DESCRIPTION OF SYMBOLS
3 ... Voice coil 704 ... Damper 705 ... Housing 706 ... Magnetic circuit 707 ... Plate 708 ... Pole
710 ... Magnetic gap 800 ... Headphone 801 ... Edge 802 ... Sheet member 803a, 803b ... Wooden
sheet 804 ... Diaphragm 805 ... Permanent magnet 806: voice coil 807: rear leak hole 808: front
leak hole 809: back air chamber 810: back air chamber 811 ... front 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 907 ...
rear leak hole 908 ... front leak hole 909 ... back air chamber 910 ... back air chamber 911 ...
front air chamber 913 ... ear hole 916 ... housing 917 ... Raised portion 922 ... protection edge
923 ... protective material
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