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JP2007221763

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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 JP2007221763
PROBLEM TO BE SOLVED: To provide an electro-acoustic transducer consisting of a wooden
sheet, wherein no breakage occurs in the wooden sheet in the mold when press forming the
diaphragm, and no lubricant is seized to the mold when press forming. An electroacoustic
transducer is provided. SOLUTION: A laminated sheet in which a sheet member made of a
material different from the wood sheet is laminated on at least one surface of one wood sheet,
and an aqueous solution containing a penetrant or an aqueous solution containing a penetrant
and a wetting agent It is characterized in that a diaphragm for an electroacoustic transducer, in
which the bonded sheet included is molded into a predetermined shape as a diaphragm by
primary press heating molding, is used. [Selected figure] Figure 8
Electro-acoustic transducer
[0001]
The present invention relates to an electroacoustic transducer.
[0002]
A speaker diaphragm made of a wooden sheet can reproduce a sound more natural than a
speaker diaphragm made of paper pulp or plastic, but it breaks when pressed and formed into a
diaphragm shape. There is a technical problem of being easy, and in order to solve this problem,
the one disclosed in Patent Document 1 below has been proposed.
[0003]
11-05-2019
1
This speaker diaphragm prepares a solution containing a lubricant, immerses in the solution a
laminated sheet in which a non-woven fabric or paper is laminated on at least one surface of a
single wooden sheet, and the laminated sheet is After molding into a predetermined shape by
press heating and forming, a central hole is formed in the obtained molded product and the
molded product is punched out to a predetermined outer diameter size, and a lubricant is
impregnated into a wooden sheet. The wood sheet is made smooth and flexible to make it
difficult to break during press heat forming.
JP 10-304492 A
[0004]
However, in the conventional speaker diaphragm, the sliding and elongation of the wooden sheet
at the time of press heating and forming are not sufficient, and therefore, the wooden sheet in
the mold is still broken at the time of press heating and forming.
[0005]
In addition, there has been a problem that the lubricant exudes to the surface of the wood sheet
at the time of press heating and forming and is burned in the mold, making it difficult for the
wood sheet to peel off the mold.
[0006]
In addition, there is a problem that the lubricant sewed to the mold is partially peeled off and
becomes a small piece and adheres to the diaphragm-shaped molded product, thereby impairing
the appearance.
[0007]
Furthermore, there is also a problem that the productivity is lowered because it is necessary to
separate the seized lubricant from the speaker diaphragm.
[0008]
An object of the present invention is to provide an electroacoustic transducer using a diaphragm
for an electroacoustic transducer which can eliminate the above-mentioned problems.
11-05-2019
2
[0009]
In order to achieve the above object, the electroacoustic transducer according to the present
invention is a bonded sheet formed by sticking a sheet member of a material different from that
of the wooden sheet on at least one surface side of a single wooden sheet. Speaker vibration in
which a bonding sheet containing an aqueous solution containing at least a penetrating agent of
an activating agent and a wetting agent and formed into a predetermined shape by press heating
and forming is formed into a predetermined shape as a diaphragm It is characterized by using a
board.
[0010]
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.
[0011]
Also, the wetting agent may be, 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.
[0012]
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 minimum
necessary amount in that the penetrant remains in the wooden sheet and affects the durability as
a diaphragm.
Therefore, the use concentration of the penetrant can preferably be 1% by weight or less.
[0013]
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3
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, the use concentration of the wetting agent is preferably within the minimum
necessary amount, in that the remaining of the wetting agent in the wooden 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.
[0014]
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.
[0015]
In the case where the laminated sheet requires uniform strength in the vertical and horizontal
directions, for example, a fabric such as a biaxial fabric or a four-axis fabric may be bonded to the
wooden sheet.
11-05-2019
4
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.
[0016]
Further, the laminated sheet is not limited to a sheet in which non-woven fabric or paper or
fabric is laminated on one side of one sheet of wood sheet, and a sheet in which non-woven
fabric or paper or fabric is laminated on both sides of one sheet of wood sheet May be.
[0017]
In addition, the non-woven fabric or the paper or the fabric does not necessarily have to be
applied to the entire surface of the wood sheet, and may be partially applied.
And the bonded nonwoven fabric or paper or fabric may be peeled off from the wooden sheet
after press heating and forming.
[0018]
The thickness of the wood sheet alone is preferably 0.01 mm to 3 mm which can be used as a
wood sheet, but particularly 0.01 mm to 0.1 mm for small diaphragms for earphones and
headphones. The preferred range is less than 0.01 mm to 0.3 mm, which is usually easy to
manufacture by peeling or slicing a wig as a diaphragm, and for large bass diaphragms, from 1
mm to 2 mm or more than 2 mm 3 mm is a preferable range.
[0019]
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.
[0020]
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5
According to the present invention, in addition to the aqueous solution containing the penetrant
and the wetting agent penetrate 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 the large expansion of the wooden sheet can be realized, the wooden sheet is less likely
to be broken in the mold at the time of press heating and molding, and the yield rate of the
speaker diaphragm 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
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.
[0021]
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.
[0022]
Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a flow chart
showing a method of manufacturing a diaphragm for an electroacoustic device according to the
embodiment, and FIG.
[0023]
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6
First, in the immersing step 101 shown in FIG. 1, as shown in FIG. 2 (a), a sheet member other
than a wooden sheet (nonwoven fabric with an adhesive layer 3 on one side of the wooden sheet
2 having a thickness of about 0.25 mm) 2) Prepare a laminated sheet 1 in which 4 is laminated,
prepare an aqueous solution containing 0.05% by weight of butyl naphthalene sulfonic acid
sodium, and cut the laminated sheet 1 into appropriate dimensions as shown in FIG. 2 (b) And
soak in the aqueous solution 5. Then, the laminated sheet 1 is dipped until it becomes flexible
(about 20 minutes).
[0024]
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.
[0025]
In addition to the butyl naphthalene sulfonate soda entering into the wooden sheet 2 to give the
wooden sheet 2 elasticity, the sodium butyl naphthalene sulfonate exerts a function of giving
more moisture to the wooden sheet 2 Since a large elongation of the sheet 2 can be realized, the
wooden sheet 2 is less likely to break in the mold 6 at the time of press heating and forming.
[0026]
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.
[0027]
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
11-05-2019
7
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
required for the thermosetting resin to fully penetrate, as compared with the case without the
application of ultrasonic waves.
[0028]
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).
[0029]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 6 shown in
FIG. .
[0030]
As described above, the molded product 12 formed into the diaphragm shape in the primary
press heating and forming step 102 is impregnated with the thermosetting resin and then the
secondary press heating and forming is performed, whereby the molded product 12 is formed.
Since the shape retention property of is improved and it becomes difficult to return to the shape
before molding, the yield rate is improved.
[0031]
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.
11-05-2019
8
[0032]
Next, a method of manufacturing the second speaker diaphragm will be described based on FIG.
1 and FIG.
[0033]
First, in the immersing step 101 shown in FIG. 1, as shown in FIG. 3A, bonding is performed by
bonding Japanese paper 19 to one side of a wooden sheet 17 having a thickness of
approximately 0.25 mm via the adhesive layer 18 The sheet 16 is prepared, and as shown in FIG.
3 (b), a mixed aqueous solution 20 containing 5% by weight of polyethylene glycol and 0.1% by
weight of sodium didiethylhexylsulfosuccinate is prepared, and the laminated sheet 16 is suitably
used. It is cut into dimensions and immersed in this aqueous solution 20.
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.
[0034]
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
no defect such as cracking. Good moldings were obtained.
[0035]
Next, in the thermosetting resin impregnating step 103 shown in FIG. 1, the molded product 26
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9
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. .
[0036]
Next, in the drying step 104 shown in FIG. 1, as shown in FIG. 3 (e), forced drying is carried out
while blowing air from the fan 29a at normal temperature on the molded product 26 in which
the thermosetting resin has penetrated. 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.
[0037]
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 secondary press heating and
forming is performed on the molding 26. .
[0038]
As described above, the molded product 26 formed into the diaphragm shape in the primary
press heating and forming step 102 is impregnated with the thermosetting resin and then
subjected to the secondary press heating and forming. Since the shape retention property of is
improved and it becomes difficult to return to the shape before molding, the yield rate is
improved.
[0039]
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
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10
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.
[0040]
Next, a method of manufacturing the third speaker diaphragm will be described based on FIGS. 1
and 4.
[0041]
First, in the immersion step 101 shown in FIG. 1, as shown in FIG. 4A, the non-woven fabric 31 is
bonded to one side of the wooden sheet 29 having a thickness of about 0.5 mm via the adhesive
layer 30. The sheet 28 is prepared, and as shown in FIG. 4 (b), an aqueous solution 32 containing
0.1% by weight of di (2-ethylhexyl sulfosuccinic acid soda) is prepared, and the laminated sheet
28 is cut to an appropriate size to obtain this aqueous solution 32. Soak in.
Then, the laminated sheet 28 is immersed until it is soft (about 20 minutes).
[0042]
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.
[0043]
11-05-2019
11
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).
[0044]
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.
[0045]
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 the secondary press heating and
forming is performed on the formed product 38 .
[0046]
As described above, the molded product 38 formed into the diaphragm shape in the primary
press heating and forming step 102 is impregnated with the thermosetting resin and then the
secondary press heating and forming is performed, whereby the molded product 38 is formed.
Since the shape retention property of is improved and it becomes difficult to return to the shape
before molding, the yield rate is improved.
[0047]
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.
11-05-2019
12
As a result, as shown in FIG. 4F, a trumpet-shaped molded article 38 (speaker diaphragm) in
which the central hole 41 is formed is obtained.
[0048]
Next, a method of manufacturing the fourth speaker diaphragm will be described based on FIGS.
1 and 5.
[0049]
First, in the immersion step 101 shown in FIG. 1, as shown in FIG. 5 (a), a bonded sheet in which
a non-woven fabric 45 is bonded to both sides of a wooden sheet 43 having a thickness of
approximately 0.25 mm via an adhesive layer 44. 42 is prepared, and an aqueous solution 46
containing 10% by weight of ethyl alcohol and 0.05% by weight of 2-ethylhexyl sulfosuccinic acid
soda is prepared as shown in FIG. 5 (b), and the bonded sheet 42 is cut into appropriate
dimensions. Immerse in this aqueous solution 46.
Then, the laminated sheet 42 is dipped until it is soft (about 20 minutes).
[0050]
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.
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 fabric 45 provided on both sides of the laminated sheet 42 makes the process highly
productive with no cracking failure.
[0051]
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13
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.
[0052]
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).
[0053]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 47 shown
in FIG. 5C is previously heated to 150 ° C. or higher, and the secondary press heating and
forming is performed on the molding 52 .
[0054]
As described above, the molded product 52 formed into the diaphragm shape in the primary
press heating and forming step 102 is impregnated with the thermosetting resin and then
subjected to the secondary press heating and forming. Since the shape retention property of is
improved and it becomes difficult to return to the shape before molding, the yield rate is
improved.
[0055]
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.
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14
In addition, the heat resistant wood grain printing may be performed on the surface of the nonwoven fabric 45 on the inner side in advance to meet the needs of people who prefer the wood
grain appearance.
[0056]
Next, a method of manufacturing the fifth speaker diaphragm will be described based on FIG. 1
and FIG.
[0057]
First, in the immersing step 101 shown in FIG. 1, as shown in FIG. 6A, the non-woven fabric 60 is
bonded in advance to one side of the wooden sheet 58 having a thickness of about 0.25 mm via
the adhesive layer 59 A laminated sheet 57 is prepared in which a non-woven fabric 73 is
laminated on the other side of the sheet 58 through the adhesive layer 72 in the form of spots, as
shown in FIG. An aqueous solution 68 containing 02% by weight is prepared, and the laminated
sheet 57 is cut to an appropriate size and immersed in the aqueous solution 68.
Then, the laminated sheet 61 is dipped until it is soft (about 20 minutes).
[0058]
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 68, no deposit is generated on the mold 62, and
the laminated sheet 57 does not burn on 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 58.
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[0059]
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.
[0060]
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).
[0061]
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 the secondary press heating and
forming is performed on the molding 67. .
[0062]
As described above, the molded product 67 formed into the diaphragm shape in the primary
press heating and forming step 102 is impregnated with the thermosetting resin and then
subjected to the secondary press heating and forming. Since the shape retention property of is
improved and it becomes difficult to return to the shape before molding, the yield rate is
improved.
[0063]
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.
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16
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.
[0064]
Next, a method of manufacturing the sixth speaker diaphragm will be described based on FIGS. 1
and 7.
[0065]
First, in the immersion step 101 shown in FIG. 1, as shown in FIG. 7A, a 4-axis woven fabric 77 is
attached to one side of a wooden sheet 75 having a thickness of about 0.25 mm via an adhesive
layer 76. A combined laminated sheet 74 is prepared, and as shown in FIG. 7B, 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 suitably used. It is cut to size
and immersed in this aqueous solution 78.
Then, the laminated sheet 74 is dipped until it is soft (about 20 minutes).
[0066]
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. In
addition, since reinforcement in the vertical and horizontal directions is obtained by the four-axis
woven fabric 77 provided on one side of the laminated sheet 74, the process has high
11-05-2019
17
productivity with no cracking failure.
[0067]
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.
[0068]
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).
[0069]
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.
[0070]
As described above, by impregnating the thermosetting resin into the molded product 84 molded
into the diaphragm shape in the primary press heating and forming step 102 and performing
press thermal molding again, the molded product 84 can be obtained. Since the shape retention
property is improved and it becomes difficult to return to the shape before molding, the yield
rate is improved.
[0071]
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
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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.
[0072]
Next, a seventh embodiment of the present invention will be described based on FIG. 1 and FIG.
[0073]
First, in the immersion step 101 shown in FIG. 1, as shown in FIG. 2 (a), sheet material other than
wood sheet 2 with adhesive layer 3 on one side of wood sheet 2 having a thickness of about 0.25
mm ( Prepare a laminated sheet 1 in which non-woven fabric 4 is laminated, prepare an aqueous
solution containing 0.05% by weight of butyl naphthalene sulfonic acid sodium, and make the
laminated sheet 1 into an appropriate size as shown in FIG. 2 (b) Cut and 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, sheet materials 4 other than a wooden sheet can have a role of a reinforcing material
which reinforces the intensity | strength of the wooden sheet 2. FIG. For example, the sheet
material 4 other than the wood sheet is a paper made by weaving yarns made of paper pulp.
[0074]
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.
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19
[0075]
In addition to the butyl naphthalene sulfonate soda entering into the wooden sheet 2 to give the
wooden sheet 2 elasticity, the sodium butyl naphthalene sulfonate exerts a function of giving
more moisture to the wooden sheet 2 Since a large elongation of the sheet 2 can be realized, the
wooden sheet 2 is less likely to break in the mold 6 at the time of press heating and forming.
[0076]
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.
[0077]
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
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 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).
[0079]
Next, in the secondary press heating and forming step 105 shown in FIG. 1, the mold 6 shown in
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20
FIG. 2C is previously heated to 150 ° C. or more, and the press heating and forming is
performed again on the molded product 12.
[0080]
As described above, after the thermosetting resin is impregnated into the molded product 12
formed into the diaphragm shape in the primary press heating and forming step 102, the press
heating and forming is performed again in the secondary press heating and forming step 105. In
this case, the shape retention property of the molded product 12 is improved and it becomes
difficult to return to the shape before molding, so that the yield rate is improved.
[0081]
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, 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).
[0082]
Next, an eighth embodiment of the present invention will be described based on FIG. 1 and FIG.
[0083]
First, in the immersion step 101 shown in FIG. 1, as shown in FIG. 3 (a), a sheet member other
than a wood sheet, with an adhesive layer 18 on one side of the wood sheet 17 having a
thickness of about 0.025 mm. A laminated sheet 16 in which 19 is laminated is prepared, and as
shown in FIG. 3 (b), a mixed aqueous solution 20 containing 5% by weight of ethylene glycol and
11-05-2019
21
0.1% by weight of sodium didiethylhexylsulfosuccinate is prepared. The bonded sheet 16 is cut to
an appropriate size and immersed in the aqueous solution 20.
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, sheet
members 19 other than a wooden sheet can have a role of a reinforcing material which
reinforces the intensity of the wooden sheet 2. For example, the sheet member 19 is a non-woven
fabric or a four-axis woven fabric.
[0084]
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
no defect such as cracking. Good moldings were obtained.
[0085]
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. .
[0086]
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22
Next, in the drying step 104 shown in FIG. 1, as shown in FIG. 3 (e), forced drying is carried out
while blowing air from the fan 29a at normal temperature on the molded product 26 in which
the thermosetting resin has penetrated. 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.
[0087]
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.
[0088]
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, the press
heating and forming is performed again in the secondary press heating and forming step 105. In
this case, the shape retention property of the molded product 26 is improved and it becomes
difficult to return to the shape before molding, so that the yield rate is improved.
[0089]
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, unlike in FIG. 3F, a small diaphragm 804 for earphones or headphones in which the
central hole 27a is not formed is formed.
The diaphragm 804 is shown in FIG. 9 (a).
[0090]
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23
(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 circumference to the outer
peripheral portion of the trumpet-shaped speaker diaphragm 701 manufactured by any of the
above first to sixth manufacturing methods. A bobbin of a voice coil 703 of a predetermined
shape (a predetermined damper 704 is bonded in advance) is inserted in and bonded to a central
hole of the diaphragm 701 for vibration.
[0091]
These three integrated parts are adhesively attached to a predetermined speaker housing 705
(predetermined magnetic circuit 706 is installed). A metal wire (not shown) for energization is
drawn out of the voice coil 703, and a terminal (not shown, previously insulated from the metal
housing 705) attached to the housing 705. It is connected to the.
[0092]
The magnetic circuit 706 is composed of 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.
[0093]
In this 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.
[0094]
The speaker diaphragm formed of the wooden sheet can reproduce reproduced sound close to
natural sound, and in particular, can reproduce middle and high-pitched sounds such as human
voice, violin sound and the like, and it has high texture. Since it has an appearance, it can be
adopted as a high-end audio device, high-end home theater system, monitor of a broadcasting
station, etc., which require high quality sound quality and high-grade appearance.
11-05-2019
24
[0095]
(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.
[0096]
In FIG. 9A, the outer peripheral portion of the dome-shaped diaphragm 804 made of the wooden
sheet 802 and the other sheet members 803 manufactured by any of the manufacturing methods
shown in the seventh and eighth embodiments is predetermined. Edges 801 of the shape are
bonded all around.
The edge 801 is made of rubber or soft plastic film.
[0097]
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
11-05-2019
25
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. Also, 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 material edge 822.
[0098]
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 is
provided at the center of the mounting surface.
[0099]
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 916, 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.
[0100]
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
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26
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 903 and the
protective edge 902.
[0101]
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
the above embodiment.
[0102]
According to the present invention, since it is possible to manufacture this type of electroacoustic
transducer diaphragm at a lower cost, not only the above-mentioned expensive products but also
low-cost stationary audio equipment and portable audio It can also be used for equipment and
the like.
[0103]
Further, according to the present invention, since the stretchability of the wooden sheet is
improved, it can be processed into a complicated shape, a highly fashionable product requiring
various shapes, and a compact space request. Can also be adopted for
[0104]
Therefore, it can be said that it is extremely useful because great satisfaction can be obtained in
all products.
[0105]
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.
[0106]
It is explanatory drawing of the manufacturing method of the diaphragm for electroacoustic
transducers of this invention.
11-05-2019
27
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 apparatus 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
[0107]
DESCRIPTION OF SYMBOLS 1 ... Bonding sheet 2 ... Wood sheet 3 ... Adhesive layer 4 ... Sheet
material 5 ... Aqueous solution 6 ... Mold 7 ... Male type 8 ... Female type 9 ... Heater 11 ...
Thermosetting resin solution 12 ... Molding 13 ... Super Sonic transducer 14 Fan 15 Center hole
16 Sheet 17 Wood sheet 18 Adhesive layer 19 Sheet member 20 Aqueous solution 21 Mold 22
Male type 23 Female type 24 Heater 26 Molded item 26a Center hole 27: thermosetting resin
solution 27a: center hole 28: sheet 28a: ultrasonic transducer 29: wooden sheet 29a: fan 30:
adhesive layer 31: non-woven fabric 32: aqueous solution 33: mold 34: male mold 35: male mold
35 ... Female die 36: Heater 38: Molded article 39: Thermosetting resin solution 40: Fan 41:
Center hole 42: Sheet 43: Wooden sheet 44: Adhesive layer 45: Non-woven fabric 46: Aqueous
solution 47: Mold 48 Male type 49 ... Female type 50 ... Heater 52 ... Molded article 53 ...
Thermosetting resin solution 54 ... Ultrasonic vibrator 55 ... Fan 56 ... Center hole 57 ... Sheet 58
... Wooden sheet 59 ... Adhesive layer 60 ... Nonwoven fabric 61 ... Sheet 62 ... mold 63 ... male
mold 64 ... female mold 65 ... heater 67 ... molded article 68 ... thermosetting resin solution 69 ...
ultrasonic transducer 70 ... fan 71 ... center hole 72 ... adhesive layer 73 ... nonwoven fabric 74 ...
Sheet 75 ... Wooden sheet 76 ... Adhesive layer 77 ... Axial woven fabric 78 ... Aqueous solution
79 ... Mold 80 ... Male type 81 ... Female type 82 ... Heater 84 ... Molded article 85 ...
Thermosetting resin solution 86 ... Ultrasonic vibrator 87 ... fan 88 ... central hole 90 ... relative
humidity 700 ... speaker 702 ... edge 703 ... voice coil 704 ... damper 705 ... housing for speaker
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705 ... housing 706 ... magnetic Path 707 ... plate 708 ... magnet 709 ... pole 800 ... headphone
801 ... edge 802 ... wooden sheet 803 ... sheet member 804 ... diaphragm 805 ... permanent
magnet 806 ... voice coil 807 ... rear leak hole 808 ... front leak hole 809 ... back air chamber 810
... back pole air chamber 811 ... front pole air chamber 812 ... air pad 813 ... ear hole 815 ... voice
coil bobbin 816 ... housing 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-Voice coil bobbin 916-Housing 917-Projection part
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