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JP2013115618

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DESCRIPTION JP2013115618
The present invention relates to a method of manufacturing a speaker diaphragm capable of
stabilizing an edge portion formed of a flexible material against chemicals while suppressing a
change in acoustic characteristics, and a speaker diaphragm manufactured by the manufacturing
method. I will provide a. A film 13 of an inorganic compound is formed on a surface of an edge
portion 12 formed of a flexible material in a speaker diaphragm 10 by a chemical vapor
deposition method. By forming a film of an inorganic compound having no influence on
chemicals on the surface of the edge portion, it is possible to stabilize the chemicals while
suppressing changes in product characteristics. In addition, since the film is formed by the
chemical vapor deposition method, it is possible to carry out a treatment which does not give a
change in product characteristics such as dissolution, swelling and deformation. [Selected figure]
Figure 1
Method of manufacturing speaker diaphragm, and speaker diaphragm manufactured by the
method
[0001]
The present invention relates to a method of manufacturing a speaker diaphragm used in an
electroacoustic transducer such as headphones and a microphone, which is a kind of audio
equipment, and a speaker diaphragm manufactured by the method.
[0002]
Headphones and earphones may have various chemicals (in a broad sense) such as cosmetics,
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1
hair setting agents, food products such as medicines, drinking water, sauces and oils, detergents,
etc. in daily life, and may be attached to a wide range of chemicals. There is a possibility that a
change in acoustic characteristics may occur due to an abnormality such as dissolution or
swelling.
For this reason, the materials used for the speaker diaphragm are required to be stable without
changing the product characteristics even if these chemicals are attached.
[0003]
However, materials that are stable to these chemicals are limited, and even if they are made of
stable materials, the product properties are not always satisfactory. That is, the speaker
diaphragm is required to reduce the natural vibration due to the divided vibration and the
resonance to have a high conversion efficiency, and it is necessary to use a high Young's
modulus, a large internal loss, and a lightweight material. Since there are few materials that fully
satisfy such various requirements, materials that normally meet product characteristics are
subjected to surface treatment that prevents them from being affected by contact with chemicals.
There is.
[0004]
For example, Patent Document 1 discloses that a diaphragm material is surface-treated for the
purpose of improving physical properties. In the technique of Patent Document 1, a natural silk
fiber is used as a base material, a metal layer is provided on the surface by a chemical vapor
deposition method, and a coating of a thermally crosslinkable resin is applied. As a result, the
internal loss of the base material is high and the rigidity can be enhanced, so the distortion is
reduced, and the heat resistance and the weather resistance can be improved.
[0005]
Unexamined-Japanese-Patent No. 5-183982
[0006]
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2
Since the technique of the said patent document 1 coats thermal crosslinkable resin on the
surface of the diaphragm for speakers, it can guess that the effect stabilized with respect to the
chemical compounds' contact is also acquired.
However, the improvement of the physical properties of the rigid material is the original purpose,
and it is effective for the diaphragm body having rigidity. However, when the edge is formed of a
flexible material, the minimum resonance frequency is increased by the increase in rigidity. It will
[0007]
That is, in the free edge type diaphragm, two pieces of a diaphragm body portion using a
material having a rigidity that does not generate abnormal resonance and an edge portion using
a material with low stiffness to lower the minimum resonance frequency. The structure is
intended to improve the sound quality, but when the rigidity of the edge portion is increased by
the coating of the thermally crosslinkable resin, the lowest resonance frequency is increased,
resulting in the deterioration of the sound quality.
[0008]
For example, fluorine treatment, silicone treatment, etc. are known as treatments that have the
effect of stabilizing the contact with chemicals and are less likely to affect the rigidity of the
flexible material, but these treatment methods are generally solution type In addition, many types
of solvents are organic solvents, and the substrate material is dissolved and swollen by the
treatment.
[0009]
For this reason, there is a problem that when it is attempted to stabilize the soft material against
chemicals, the acoustic characteristics of the speaker diaphragm change.
[0010]
The present invention has been proposed in view of the above, and the purpose of the present
invention is a vibration for a speaker capable of stabilizing the chemicals of the edge portion
formed of a flexible material while suppressing the change of the acoustic characteristic. It is an
object of the present invention to provide a method for manufacturing a plate and a speaker
diaphragm manufactured by the method.
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[0011]
In order to solve the above-mentioned subject, in the manufacturing method of the diaphragm
for speakers of the present invention concerning Claim 1, it is inorganic by chemical vapor
deposition on the surface of edge part 12 formed with the flexible material in diaphragm 10 for
speakers. It is characterized in that a film 13 of a compound is formed.
[0012]
The invention according to claim 2 is characterized in that, in the method for producing a
speaker diaphragm according to claim 1, the chemical vapor deposition method is an inductively
coupled plasma CVD method.
[0013]
The invention according to claim 3 is characterized in that, in the method for producing a
speaker diaphragm according to claim 1 or 2, the inorganic compound contains any of SiO2,
SiON, and SiN.
[0014]
The invention according to claim 4 is the method for manufacturing a speaker diaphragm
according to any one of claims 1 to 3, wherein the soft material of the edge portion 12 is a
vulcanized rubber, an elastomer, a woven fabric or a non-woven fabric substrate. It is
characterized in that it contains any of rubber coated materials.
[0015]
The invention according to claim 5 is the method for manufacturing a speaker diaphragm
according to any one of claims 1 to 4, wherein the film thickness of the film 13 of the inorganic
compound is 25 nm or more and 400 nm or less, preferably 50 nm to 200 nm It is characterized
by being in the range of
[0016]
According to a sixth aspect of the present invention, there is provided a speaker diaphragm
characterized by being manufactured by the method for manufacturing a speaker diaphragm
according to any one of the first to fifth aspects.
[0017]
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According to the first aspect of the present invention, since the film of the inorganic compound
having no influence on chemicals is formed on the surface of the edge portion formed of the
flexible material in the diaphragm, the product required for the edge portion Stabilization for
chemicals can be achieved while suppressing changes in the properties.
In addition, since the film is formed by the chemical vapor deposition method, it is possible to
carry out a treatment which does not give a change in product characteristics such as dissolution,
swelling and deformation.
[0018]
According to the second aspect of the present invention, normal pressure and low temperature
processing can be performed by using the inductive coupling type plasma CVD method, and it is
possible to suppress the deterioration and the characteristic change of the soft material of the
edge portion.
[0019]
As described in claim 3, SiO2, SiON, SiN or the like can be used as the inorganic compound.
[0020]
As described in claim 4, as the soft material of the edge portion, a material obtained by coating a
rubber on a vulcanized rubber, an elastomer, a woven fabric or a non-woven fabric can be used.
[0021]
According to the invention of claim 5, resistance to chemicals is obtained and there is no
influence on product characteristics.
[0022]
According to the sixth aspect of the present invention, it is possible to provide a stable speaker
diaphragm without changing the acoustic characteristics even when chemicals are attached.
[0023]
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It is process drawing for demonstrating the manufacturing method of the diaphragm for
speakers which concerns on the Example of this invention.
The diaphragm produced with the manufacturing method shown in FIG. 1 is shown, (a) figure is a
top view, (b) figure is an AA arrow arrow sectional view of (a) figure.
It is sectional drawing which shows the structural example of the speaker (driver for
headphones) using the diaphragm shown in FIG.
It is a figure for demonstrating the relationship between the film thickness of an inorganic
compound, and the tolerance with respect to chemicals.
It is a figure for demonstrating the relationship between the thickness of the film | membrane of
an inorganic compound, and an acoustic characteristic (minimum resonance frequency).
[0024]
In the present invention, a film of an inorganic compound is formed on a surface of an edge
portion formed of a flexible material in a speaker diaphragm by a chemical vapor deposition
(CVD: Chemical Vapor Deposition) method.
The diaphragm body portion and the edge portion are formed in another manufacturing process,
and a film of an inorganic compound is formed on the surface of the edge portion, and then the
edge portion is adhered to the outer peripheral edge of the diaphragm body portion by an
adhesive or the like or Join to form a diaphragm.
[0025]
Stabilization can be achieved by forming a film of an inorganic compound which has no influence
on chemicals on the surface of an edge portion formed of a flexible material.
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By appropriately setting the film thickness of the film of the above-mentioned inorganic
compound, it is possible to suppress the change of the acoustic characteristic as the diaphragm.
In addition, since the film is formed by the chemical vapor deposition method, it is possible to
carry out a treatment which does not change the product characteristics such as dissolution,
swelling, deformation and the like.
[0026]
Hereinafter, an embodiment of the present invention will be described based on the drawings.
[0027]
FIG. 1 is a process diagram for explaining a method of manufacturing a speaker diaphragm
according to an embodiment of the present invention.
In this example, a method of manufacturing a free edge structure is shown in which the
diaphragm body portion and the edge portion are formed and joined in another manufacturing
process.
FIG. 2 shows a diaphragm manufactured by the manufacturing method shown in FIG. 1, wherein
(a) is a plan view and (b) is a cross-sectional view taken along line A-A of (a). .
[0028]
As shown in FIG. 1, in the method of manufacturing a speaker diaphragm according to the
embodiment of the present invention, (a) manufacturing process of diaphragm body, (b)
manufacturing process of edge, (c) surface of edge And a step of bonding the diaphragm body
portion and the edge portion.
Here, either the manufacturing process of the diaphragm body of (a) or the manufacturing
process of the edge of (b) may be performed first.
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[0029]
(A) Manufacturing Process of Diaphragm Body The diaphragm body 11 can be made of various
materials such as paper, polymer, metal, composite and ceramics, and vibration is performed by a
known manufacturing method. The plate body 11 is manufactured.
Taking a paper-based material as an example, pulp is produced by papermaking, drying, heat
pressing, and the like.
At this time, pulp may be used as a main material, and other auxiliary materials may be mixed as
a reinforcing material according to the required acoustic characteristics.
Polyester and the like are widely used as polymeric materials.
[0030]
Then, if necessary, a resin or the like is coated on the surface of the diaphragm body portion 11
to stabilize it against contact with chemicals.
Alternatively, the pulp may be beaten into fibers, resin powder may be mixed and dispersed, and
heat may be melted at the time of molding to fill gaps between the pulp and impregnate the
diaphragm body 11 with the same effect. Be
[0031]
(B) Manufacturing process of the edge part The edge part 12 sets a sheet-like material including
a flexible material such as vulcanized rubber and elastomer having a thickness of about 10 to
200 μm in a thermoforming machine, and After forming at a temperature, the inner diameter of
the edge portion 12 is removed by a press machine to form the same.
[0032]
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As the vulcanized rubber, for example, styrene-butadiene rubber, nitrile-butadiene rubber,
ethylene-propylene-terpolymer rubber, isoprene rubber, chloroprene rubber, isobutyleneisoprene rubber, ethylene-propylene rubber, silicone rubber and the like can be used.
Moreover, as said elastomer, a polystyrene type, polyolefin type, polyurethane type, polyester
type, a polyamide type, a polybutadiene type, ethylene-vinyl acetate type, polyvinyl chloride type
etc. can be used, for example.
Alternatively, a flexible material in which a woven fabric or a non-woven fabric substrate is
coated with rubber or the like may be used.
[0033]
(C) Step of forming a film of inorganic compound on the surface of the edge portion A film 13 of
inorganic compound is formed on the surface of the edge portion 12 formed as described above
by a chemical vapor deposition (CVD) method. . Among the CVD methods, it is preferable to use
inductively coupled plasma CVD (ICP-CVD: Inductively Coupled Plasma-CVD), which is capable of
processing at normal pressure and low temperature, because the flexible material is weak to high
pressure and high temperature.
[0034]
In the case of depositing an inorganic compound such as SiO 2 by the ICP-CVD method, the film
thickness of SiH 4, O 2, N 2 gas flow is as follows: Can form a 200 nm SiO 2 film.
[0035]
As the above-mentioned inorganic compound, SiON and SiN other than SiO2 are suitable.
Since the inorganic compound coating 13 has no effect on chemicals, it does not change product
characteristics such as dissolution, swelling, and deformation. However, since the rigidity is
generally high, if the edge portion 12 of the diaphragm 10 is formed to have a thickness greater
than necessary, acoustic characteristics such as the elastic modulus and the lowest resonance
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frequency are changed.
[0036]
Therefore, in consideration of the balance between the thickness that can obtain resistance to
chemicals and the thickness that does not affect the acoustic characteristics, the film thickness is
25 nm or more and the acoustic characteristics so that the resistance to chemicals can be
obtained. It is 400 nm or less without influence, and more preferably in the range of 50 nm to
200 nm.
[0037]
(D) Bonding step of diaphragm body and edge portion After the above-described steps are
completed, a bonding step of the diaphragm body portion 11 and the edge portion 12 is
performed using a known method.
In this process, for example, the outer peripheral edge of the manufactured diaphragm body 11
and the inner peripheral edge of the edge 12 are bonded with an adhesive or the like.
[0038]
For example, a urethane-based adhesive can be used as the adhesive. As a result, as shown in
FIGS. 2A and 2B, the outer peripheral edge portion of the diaphragm body 11 and the inner
peripheral edge portion of the edge portion 12 on which the film 13 of the inorganic compound
is formed on the surface are joined. A diaphragm 10 having a two-piece structure is formed.
[0039]
FIG. 3 is a cross-sectional view showing a configuration example of a speaker (headphone driver)
1 using the diaphragm 10 shown in FIG. The speaker 1 is a so-called internal magnet type, and is
supported in the magnetic gap of the magnetic circuit 5 and a magnetic circuit 5 having a pot
type yoke 2 also serving as a frame, a magnet 3 and a disc-like pole plate 4. A diaphragm body
11 in which the voice coil 6 is disposed below the bending portion, and an edge 12 joined to the
outer peripheral edge of the diaphragm body 11 are provided. The diaphragm body portion 11
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10
and the edge portion 12 are bonded and integrated by an adhesive or the like.
[0040]
According to the manufacturing method as described above, since the film 13 of the inorganic
compound having no influence on the chemicals is formed on the edge portion 12 formed of the
flexible material in the diaphragm 10, the acoustic as the diaphragm 10 Stabilization for
chemicals can be achieved while suppressing changes in the properties. In particular, in the case
of a headphone, a microphone or the like, since the edge portion 12 protrudes to the user's ear
side at the time of wearing, chemicals are easily attached and a high effect can be obtained.
[0041]
In addition, since the film is formed by inductive coupling type plasma CVD that can be
processed at normal pressure and low temperature, the change in product characteristics such as
dissolution, swelling, deformation, etc. is given while suppressing the deterioration and
characteristic change of the soft material No processing can be done.
[0042]
The inventor conducted an experiment to examine the resistance and acoustic characteristics of
the produced diaphragm 10 to chemicals.
FIG. 4 is a view for explaining the relationship between the film thickness of the inorganic
compound and the resistance to chemicals. FIG. 5 is a view for explaining the relationship
between the thickness of the film of the inorganic compound and the acoustic characteristics.
[0043]
As shown in FIG. 4, the resistance to chemicals increases as the thickness of the film of the
inorganic compound increases, and as shown in FIG. 5, the minimum resonance occurs as the
thickness of the film of the inorganic compound increases. The frequency goes up. In
consideration of the balance between the thickness that provides sufficient resistance to
chemicals and the thickness that does not affect the lowest resonance frequency, the film
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11
thickness of the inorganic compound is 25 nm or more so that the resistance to chemicals can be
obtained. And 400 nm or less with few raise of the lowest resonance frequency is desirable, and
more preferably it is the range of 50 nm-200 nm.
[0044]
Moreover, SiO2 was formed in thickness of 300 nm by ICP-CVD method with respect to
thermoplastic polyurethane called TPU (Thermoplastic Polyurethane) with a material thickness of
40 micrometers as a material of edge part 12, and the elastic modulus was measured. Although
this treatment increased the elastic modulus by about 10%, no influence on the product was
observed.
[0045]
A sunscreen cream (NIVEA SUN (registered trademark) PROTECT WATER GEL SPF 30 PA ++) was
applied to the treated product as a medicine used in daily life. The untreated product swelled but
the treated product did not swell.
[0046]
Therefore, according to the present invention, a method of manufacturing a speaker diaphragm
that can stabilize the edge portion formed of a flexible material with respect to chemicals while
suppressing a change in acoustic characteristics, and a method of manufacturing the same. A
speaker diaphragm can be provided.
[0047]
Reference Signs List 1 speaker 2 yoke 3 magnet 4 pole plate 5 magnetic circuit 6 voice coil 10
diaphragm (diaphragm for speaker) 11 diaphragm body portion 12 edge portion 13 film of
inorganic compound
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