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JP2007288258

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DESCRIPTION JP2007288258
The present invention provides a component for a speaker device, etc., having a material
structure capable of improving rust resistance and Young's modulus (elastic modulus). A
component member for a speaker device is various members constituting a speaker device, and
examples thereof include a frame, a voice coil bobbin, a damper, a diaphragm, an edge, a cap, a
housing, and the like. The component for a speaker device includes a magnesium-based material
made of magnesium or a magnesium alloy, and an electrodeposition coating film formed on the
surface of the magnesium-based material. Thereby, the surface of the magnesium-based material
having the property of being easily rusted is protected by the electrodeposition coating film, and
the rust resistance of the component member for a speaker device can be improved. In particular,
in the component member for a speaker device, the electrodeposition coating film is filled with a
filler having a high Young's modulus (elastic modulus). Thereby, the improvement of the Young's
modulus of the component member for a speaker apparatus can be aimed at. [Selected figure]
Figure 2
Component member for speaker device and speaker device
[0001]
The present invention relates to the structure of a material of a component for a speaker device.
[0002]
2. Description of the Related Art Conventionally, there has been known a speaker device
configured of various components for a speaker device such as a diaphragm, an edge, a frame, a
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damper, a voice coil bobbin, a cap, and a housing.
A magnesium diaphragm made of magnesium is known as a diaphragm which is an example of
such a component member for a speaker device. Such a magnesium diaphragm is light in weight,
high in internal loss, and high in vibration damping performance, and thus is suitably used as a
speaker device for high frequency reproduction such as tweeter.
[0003]
Here, since magnesium has the property of being easily oxidized as compared with aluminum
and titanium, the surface of the magnesium diaphragm is usually subjected to antirust treatment
such as anodizing treatment and electrodeposition coating treatment in many cases. An anodic
oxide film and an electrodeposition coating film (for example, an acrylic resin film) are formed by
such anticorrosion treatment, and an example of the magnesium diaphragm which has an
anticorrosion effect is described in patent documents 1 and 2.
[0004]
The speaker diaphragm described in Patent Document 1 includes a magnesium sheet or a
magnesium alloy, a primer layer formed of an epoxy resin, an primer layer formed of an epoxy
resin, and an upper coating layer formed of an acrylic resin or the like. Become. It is supposed
that a high rust prevention effect is obtained by this material composition.
[0005]
Moreover, the magnesium diaphragm described in Patent Document 2 is a thin plate of
magnesium containing magnesium as a main component, an anodic oxide film provided on the
surface thereof, dyed with a dye, and an acrylic resin provided on the surface. And the
electrodeposition coating film which has as a main component. By this material composition, the
designability can be improved, and good rust resistance can be obtained.
[0006]
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A magnesium material has an anodic oxide film which does not change the gloss of the metal
base on the outer surface of magnesium or magnesium alloy product, and an electrodeposition
coating film made of colorless or colored transparent acrylic resin on the anodic oxide film.
Products are known (see, for example, Patent Document 3). Due to this material composition, this
magnesium material product is considered to exhibit the gloss of a metal substrate with hardly
changing the gloss and color tone or gloss of the magnesium material substrate, and is extremely
excellent in rust resistance.
[0007]
Patent Document 1: JP-A-2002-369284 Patent Document 2: JP-A-2005-72641 Patent Document
2: JP-A-11-236698
[0008]
However, as described above, since the electrodeposition coating film using an acrylic resin has a
low Young's modulus (elastic modulus), there is a problem in that the Young's modulus of the
component member for a speaker device is reduced.
For example, when such a material structure is applied to a diaphragm as an example of a
component for a speaker device, the natural frequency of the diaphragm is lowered, and desired
mid-to-high range characteristics can not be obtained in the speaker device. There is a risk.
[0009]
As problems to be solved by the present invention, the above-mentioned ones can be mentioned
as an example. An object of the present invention is to provide a speaker device component
having a material structure capable of improving rust resistance and Young's modulus (elastic
modulus), and a speaker device using the same.
[0010]
The invention according to claim 1 is a component member for a speaker device, comprising: a
magnesium-based material made of magnesium or a magnesium alloy; and an electrodeposition
coating film formed on the surface of the magnesium-based material; The coated film is
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characterized by being filled with a filler.
[0011]
The invention according to claim 2 is a component member for a speaker device, which is a
magnesium-based material made of magnesium or a magnesium alloy, an anodic oxide film or a
chemical conversion film formed on the surface of the magnesium-based material, and the anode
An electrodeposition coating film formed on the surface of the oxide film or the chemical
conversion treatment film, and the electrodeposition coating film is filled with a filler.
[0012]
In one embodiment of the present invention, the component member for a speaker device
comprises a magnesium-based material made of magnesium or a magnesium alloy, and an
electrodeposition coating film formed on the surface of the magnesium-based material, and the
electrodeposition coating The film is filled with a filler.
[0013]
The above component member for a speaker device includes a magnesium-based material made
of magnesium or a magnesium alloy, and an electrodeposition coating film formed on the surface
of the magnesium-based material.
Here, as a component member for a speaker device, for example, a frame, a voice coil bobbin, a
damper, a diaphragm, an edge, a cap, a housing and the like can be mentioned.
As described above, in this component member for a speaker device, since the electrodeposition
coating film functioning as a rustproofing film is formed on the surface of the magnesium based
material, the surface of the magnesium based material having the property of being easily rusted
is electrodeposited It is protected by the film, and the rust resistance of the component member
for a speaker device can be improved.
[0014]
In particular, in the speaker device component, since the electrodeposition coating film is filled
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with the filler (reinforcing material), the Young's modulus (elastic modulus) of the speaker device
component can be improved.
In addition, in the above component members for a speaker device, an optimal balance between
the anticorrosion property and the Young's modulus (elastic modulus) can be achieved by
appropriately changing the amount of the filler to be filled in the electrodeposition coating film
as necessary. Can.
[0015]
Further, when the above material structure is applied to a diaphragm as an example of a
component member for a speaker device, it is possible to increase the natural frequency of the
diaphragm and to improve the middle-to-high range characteristic of the speaker device. And the
desired middle and high range characteristics can be obtained.
[0016]
In a preferred example, the electrodeposition coating film is preferably formed of an acrylic resin,
an epoxy resin or the like, and the filler is a material having a high Young's modulus (elastic
modulus), for example, a metal oxide such as alumina. It is preferable to be made of a material
containing any of the following: heavy metals such as tungsten, nitrides such as aluminum nitride
and boron nitride, and silicates such as talc.
Alternatively, the electrodeposition coating film is formed of a cationic electrodeposition paint
having an epoxy resin as a skeleton, each having a sulfonium group as a cation group and a
propargyl group as a reactive group. The filler is preferably a material having a high Young's
modulus (elastic modulus), for example, metal oxides such as alumina, heavy metals such as
tungsten, nitrides such as aluminum nitride and boron nitride, and silica such as talc. It is
preferable that it is formed of a material containing any of acid salts. In addition, the filling
amount of the filler can be set to an amount capable of obtaining a desired Young's modulus
(elastic modulus) according to the target performance in the component member for a speaker
device, for example, 0.1 wt% to 50 wt% It is preferable that it is set. If this is less than 0.1 wt%,
the remarkable improvement in Young's modulus of the component for a speaker device can not
be expected, and if it is 50 wt% or more, the weight of the component for a speaker device
increases and the decrease in rust resistance becomes large. It is because it is not practical.
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[0017]
In another embodiment of the present invention, a speaker device component comprises: a
magnesium-based material made of magnesium or a magnesium alloy; an anodic oxide film or a
chemical conversion film formed on the surface of the magnesium-based material; and the anodic
oxide film Or the electrodeposition coating film formed on the surface of the said chemical
conversion treatment film, and the said electrodeposition coating film is filled with the filler.
[0018]
The component member for a speaker device described above comprises a magnesium-based
material made of magnesium or a magnesium alloy, an anodic oxide film or a chemical
conversion treatment film formed on the surface of the magnesium material, and a surface of the
anodic oxide film or the chemical conversion treatment film. And an electrodeposition coating
film formed thereon.
Here, as a component member for a speaker device, for example, a frame, a voice coil bobbin, a
damper, a diaphragm, an edge, a cap, a housing and the like can be mentioned. As described
above, in this speaker device component, the anodic oxide film or the chemical conversion film
that functions as an anticorrosion treatment film is formed on the surface of the magnesiumbased material, and furthermore, the surface of the anodic oxide film or the chemical conversion
treatment film Since an electrodeposition coating film that functions as a rustproofing treatment
film is formed, the surface of a magnesium-based material having a rusting property is
superimposedly protected by an anodic oxide film or a chemical conversion treatment film and
an electrodeposition coating film, The rust resistance of the component member for a speaker
device can be further improved.
[0019]
In particular, in the speaker device component, since the electrodeposition coating film is filled
with the filler (reinforcing material), the Young's modulus (elastic modulus) of the speaker device
component can be improved. In addition, in the above component members for a speaker device,
an optimal balance between the anticorrosion property and the Young's modulus (elastic
modulus) can be achieved by appropriately changing the amount of the filler to be filled in the
electrodeposition coating film as necessary. Can.
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[0020]
Further, when the above material structure is applied to a diaphragm as an example of a
component member for a speaker device, it is possible to increase the natural frequency of the
diaphragm and to improve the middle-to-high range characteristic of the speaker device. And the
desired middle and high range characteristics can be obtained.
[0021]
In a preferred example, the electrodeposition coating film is preferably formed of an acrylic resin,
an epoxy resin or the like, and the filler is a material having a high Young's modulus (elastic
modulus), for example, a metal oxide such as alumina. , A heavy metal such as tungsten, a nitride
such as aluminum nitride or boron nitride, or a silicate such as talc.
Alternatively, the electrodeposition coating film is preferably formed of a cationic
electrodeposition paint having an epoxy resin having a sulfonium group as a cationic group and a
propargyl group as a reactive group as a skeleton, and the filler is high in Young Formed of a
material having a modulus (elastic modulus), for example, a metal oxide such as alumina, a heavy
metal such as tungsten, a nitride such as aluminum nitride or boron nitride, or a silicate such as
talc Is preferred. In addition, the filling amount of the filler can be set to an amount capable of
obtaining a desired Young's modulus (elastic modulus) according to the target performance in
the component member for a speaker device, for example, 0.1 wt% to 50 wt% It is preferable that
it is set. If this is less than 0.1 wt%, the remarkable improvement in Young's modulus of the
component for a speaker device can not be expected, and if it is 50 wt% or more, the weight of
the component for a speaker device increases and the decrease in rust resistance becomes large.
It is because it is not practical.
[0022]
According to still another embodiment of the present invention, a speaker device provided with
the above-described component device for a speaker device can be configured. In particular, in
the case of an on-vehicle speaker device used in a severe environment, high rust resistance is
required, but by applying the component member for a speaker device having the abovedescribed material structure to the on-vehicle speaker device, Such requirements can be met.
[0023]
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Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings.
[0024]
[Configuration of Component for Speaker Device] FIG. 1 is a cross-sectional view of the speaker
device 100 including the component for a speaker device of the present invention, taken along a
plane passing through the central axis thereof.
[0025]
As shown in FIG. 1, the speaker device 100 is configured to include a speaker unit 50 and a
housing 51 for housing the speaker unit 50.
In the present invention, the configuration and driving method of the speaker device, and the
shape, position, size, and the like of the component members for the speaker device are not
limited to the configuration and the like described below.
[0026]
The speaker unit 50 further includes a magnetic circuit system and a vibration system.
The magnetic circuit system comprises a yoke 1 including a cylindrical pole 1a and a flange 1b
extending outward from the lower end of the outer peripheral wall of the pole 1a, and an annular
shape attached on the flange 1b. And an annular plate 3 mounted on the magnet 2. The vibration
system has a voice coil bobbin 4, a voice coil 5 wound around the lower end of the outer
peripheral wall of the voice coil bobbin 4, a damper 6, a diaphragm 7, a frame 8, an edge 9 and a
cap 10. doing.
[0027]
In the speaker device 100 having such a configuration, in the present invention, in particular,
materials of the speaker device components such as the frame 8, the voice coil bobbin 4, the
damper 6, the diaphragm 7, the edge 9, the cap 10 and the housing 51. It has features in its
structure.
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[0028]
First, the configuration of a speaker device component to which the present invention is applied
will be described with reference to FIG. 1, and then the structure of the material will be described
with reference to FIG.
[0029]
The frame 8 has a substantially cup-like shape, and is a member having a function of supporting
various components constituting the speaker unit 50.
The lower end of the frame 8 is mounted on the plate 3.
[0030]
The voice coil bobbin 4 is a member having a function of fixing the voice coil 5 at a
predetermined position, vibrating along with the voice coil 5 according to the voice input signal,
and transmitting the vibration to the diaphragm 7.
The voice coil bobbin 4 has a cylindrical shape, and is provided at a position covering the vicinity
of the upper end portion of the outer peripheral wall of the pole portion 1 a which is an element
of the yoke 1.
[0031]
The damper 6 is a member that elastically supports the voice coil bobbin 4. The damper 6 has an
annular shape, and a plurality of concentric wave shapes (corrugations) are formed. The inner
peripheral edge of the damper 6 is attached to the outer peripheral wall of the voice coil bobbin
4, while the outer peripheral edge of the damper 6 is attached to an appropriate position of the
frame 8.
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[0032]
The diaphragm 7 is a member having a function of emitting a sound wave according to the sound
input signal. The diaphragm 7 has a cone shape. The inner peripheral edge of the diaphragm 7 is
attached to the upper end of the outer peripheral wall of the voice coil bobbin 4 while the outer
peripheral edge of the diaphragm 7 is attached to the edge 9 at an appropriate position.
[0033]
The edge 9 is a member having an annular shape and having a function of absorbing
unnecessary vibration and the like generated in the diaphragm 7. The inner peripheral edge of
the edge 9 is attached to the outer peripheral edge of the diaphragm 7, while the outer
peripheral edge of the edge 9 is attached to the frame 8 at an appropriate position.
[0034]
The cap 10 has a dome shape and is a member having a function of preventing dust and the like
from intruding into the inside of the speaker unit 50. The cap 10 is disposed at a position
covering the upper surface side of the voice coil bobbin 4.
[0035]
The housing 51 is a member having a function of housing and fixing the speaker unit 50.
[0036]
Next, with reference to FIG. 2, the structure etc. of the raw material of the structural member for
speaker apparatuses which characterizes this invention are demonstrated.
[0037]
Fig.2 (a) is a principal part expanded sectional view of the component member for speaker
apparatuses which has the 1st raw material structure which becomes an application object of this
invention.
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On the other hand, FIG. 2 (b) is an enlarged sectional view of an essential part of a speaker device
component having a second material structure to which the present invention is applied.
[0038]
As described above, since magnesium is easily oxidized due to its nature, an anodized film that
functions as a rustproofing film is usually formed on the surface as a measure to prevent the
occurrence of such oxidation.
Furthermore, an electrodeposition coating film made of an acrylic resin and functioning as a
rustproofing film may be formed on the surface of the anodized film. Thereby, the rustproofing
can be improved. However, as described above, since the electrodeposition coating film using an
acrylic resin has a low Young's modulus (elastic modulus), there is a problem that the Young's
modulus of the component member for the speaker device is lowered accordingly. . For example,
when such a material structure is applied to a diaphragm as an example of a component for a
speaker device, the natural frequency of the diaphragm is lowered, and desired mid-to-high range
characteristics can not be obtained in the speaker device. There is a risk.
[0039]
Therefore, in the component member for a speaker device to which the present invention is
applied, the electrodeposition coating film is filled with a filler (reinforcing material) having a
high Young's modulus (elastic modulus) in order to improve such problems.
[0040]
Specifically, as shown in FIG. 2A, the component member for a speaker device having the first
material structure to which the present invention is applied is a magnesium-based material 70
made of magnesium or a magnesium alloy, and a magnesium-based material An electrodeposition
coating film 73 formed on the surface of the material 70 and functioning as a rustproofing
treatment film is provided, and the electrodeposition coating film 73 is filled with a filler 75.
On the other hand, as shown in FIG. 2B, the component members for a speaker device having the
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second material structure to which the present invention is applied include magnesium-based
material 70 made of magnesium or magnesium alloy and magnesium-based material 70.
Anodized film 71 or chemical conversion film 72 which is formed on the surface and functions as
an anticorrosive treatment film, and an electrodeposition coated film 73 which is formed on the
surface of the anodic oxide film 71 or chemical conversion film 72 and which functions as an
anticorrosion film And the electrodeposition coating film 73 is filled with the filler 75.
[0041]
For example, as a specific example, the diaphragm 7 as a component member for a speaker
device is formed on the surface of a magnesium alloy foil (magnesium-based material 70) having
a thickness of 0.05 mm, and the thickness It has an anodic oxide film 71 of 0.001 mm and an
electrodeposition coating film 73 formed on the surface of the anodic oxide film 71 and having a
thickness of 0.006 mm, and the electrodeposition coating film 73 contains about 10 wt% of the
filler 75. It can be set as about% filling.
[0042]
In a preferred example, the electrodeposition coating film 73 is preferably formed of an acrylic
resin, an epoxy resin, or the like.
The electrodeposition coating film 73 is preferably formed of a cationic electrodeposition paint
having an epoxy resin having a sulfonium group as a cationic group and a propargyl group as a
reactive group as a skeleton. Further, the filler 75 is a material having a high Young's modulus
(elastic modulus), for example, metal oxides such as alumina, heavy metals such as tungsten,
nitrides such as aluminum nitride and boron nitride, and silicates such as talc. It is preferable that
it is formed of a material containing any of the above. Alternatively, the filling amount of the filler
75 can be set to an amount such that a desired Young's modulus (elastic modulus) can be
obtained according to the target performance in the component for a speaker device, for
example, about 0.1 wt% to about 0.1 wt% It is preferable to set to 50 wt%. If this is less than 0.1
wt%, the remarkable improvement in Young's modulus of the component for a speaker device
can not be expected, and if it is 50 wt% or more, the weight of the component for a speaker
device increases and the decrease in rust resistance becomes large. It is because it is not
practical. In the present invention, the thickness of each of the magnesium-based material 70, the
anodic oxide film 71, the chemical conversion treatment film 72 and the electrodeposition
coating film 73 is not limited, and the shape and size of the filler 75 are also not limited. .
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[0043]
In the speaker device component having the first and second material structures described
above, the electrodeposition coating film 73 is filled with the filler 75 (reinforcement material)
having a high Young's modulus (elastic modulus). The Young's modulus (elastic modulus) of the
constituent members can be improved. Further, in the present embodiment, by appropriately
changing the amount of the filler 75 to be filled in the electrodeposition coating film 73, it is
possible to achieve an optimal balance between the rustproofness and the Young's modulus
(elastic modulus).
[0044]
In addition, when the above material structure is applied to the diaphragm 7 as a component
member for a speaker device, the natural frequency of the diaphragm 7 can be increased, and the
middle-to-high range characteristic of the speaker device 100 is improved. And the desired
middle and high range characteristics can be obtained.
[0045]
About this point, with reference to FIG. 3, the characteristic of the diaphragm as an example of
the structural member for speaker apparatuses to which the material structure of this invention
is applied is demonstrated.
[0046]
FIG. 3 shows density ρ [g / cm <3>], Young's modulus (elastic modulus) E [× 10 <10> N / m <2]
in each diaphragm of Comparative Example 1, Comparative Example 2 and this example. It is the
chart which compared each physical property value of>], internal loss, and specific elastic
modulus E / rho [x10 <7> m <2> / s <2>].
[0047]
Here, Comparative Example 1 includes a magnesium-based material, an anodized film formed on
the surface thereof, and an electrodeposited film formed on the surface of the anodized film and
made of an acrylic resin, The coating film has a configuration in which the filler is not filled.
Comparative Example 2 includes a magnesium-based material, an anodized film formed on the
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surface, and an electrodeposited film formed on the surface of the anodized film and made of an
epoxy resin, and the electrodeposited film Has a configuration in which the filler is not filled.
The present embodiment comprises a magnesium based material, an anodic oxide film formed on
the surface thereof, and an electrodeposition coating film formed on the surface of the anodic
oxide film and made of an epoxy resin, and the electrodeposition coating film The filler has a
composition filled with about 10 wt%.
[0048]
Generally, the diaphragm is required to have a large Young's modulus E and a specific elastic
modulus E / ρ in order to expand the piston movement area, and a large internal loss in order to
smooth the frequency characteristics. .
In this respect, as is apparent from FIG. 3, the diaphragm according to the present embodiment
has larger physical property values of Young's modulus E and specific elastic modulus E / ρ as
compared with the diaphragms according to Comparative Examples 1 and 2. I understand that.
The magnitude of the internal loss is approximately the same in the diaphragm according to the
present embodiment and in Comparative Examples 1 and 2. That is, it is understood from this
experimental result that by filling the electrodeposition coating film with a filler having a high
Young's modulus (elastic modulus), a diaphragm having a high Young's modulus E and a high
specific elastic modulus E / ρ can be obtained. In particular, the remarkable effects of the
present invention can be expected by applying such a material structure to a thin and light
diaphragm for high-range reproduction. As a result, as described in the beginning, it is possible
to increase the natural frequency of the diaphragm, to improve the mid-to-high range
characteristic of the speaker device, and to obtain a desired mid-to-high range characteristic.
[0049]
In addition, in the component member for a speaker device having the first material structure,
since the electrodeposition coating film 73 functioning as an anticorrosive treatment film is
formed on the surface of the magnesium-based material 70, the magnesium-based material
having a rusting property The surface 70 is protected by the electrodeposition coating film 73,
and the rust resistance of the component member for a speaker device can be improved. In
addition, in the component member for a speaker device having the second material structure, in
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addition to the first material structure, an electrodeposition coating film 73 which further
functions as a rustproofing treatment film on the surface of the anodic oxide film 71 or the
chemical conversion treatment film 72 Since it is formed, the surface of the magnesium-based
material 70 having the property of being easily rusted is protected in an overlapping manner by
the anodic oxide film 71 or the chemical conversion film 72 and the electrodeposition coating
film 73, as compared with the first material structure. Thus, the rust resistance of the speaker
device component can be further improved.
[0050]
As described above, by applying the material structure of the present invention to the component
member for a speaker device, the rust resistance of the component member for a speaker device
can be improved, and in particular, a diaphragm as an example of a component member for a
speaker device Thus, the rust resistance and Young's modulus (elastic modulus) can be improved.
In particular, in the case of an on-vehicle speaker device used under a severe environment, high
rust resistance is required, but by applying the component member for a speaker device having
the material structure of the present invention to the on-vehicle speaker device , Such
requirements can be met.
[0051]
[Method of Manufacturing Component for Speaker Device] Next, a method of manufacturing the
above-described component for speaker device, to which the present invention is applied, will be
described with reference to FIGS. 4 and 5 and the like. FIG. 4 is a flowchart showing a method of
manufacturing a component for a speaker device to which the present invention is applied. FIG. 5
shows a rolling process diagram corresponding to the rolling process P1 in FIG.
[0052]
First, a magnesium-based material 70x made of magnesium or a magnesium alloy is rolled to a
desired thickness by a rolling process 200 to obtain a sheet-like magnesium-based sheet 24
having a predetermined thickness (rolling process P1).
[0053]
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Specifically, first, as shown in FIG. 5, the magnesium-based material 70 x having a predetermined
thickness is rolled to a desired thickness by a rolling process 200.
For example, the magnesium-based material 70x is formed as a sheet material having a
predetermined thickness and a thickness of about 150 μm in advance. Then, in the rolling
process 200, the magnesium-based material 70x is repeatedly rolled a plurality of times by the
rolling mill 23, whereby a magnesium-based sheet 24 having a predetermined thickness is
manufactured (arrow s6).
[0054]
The rolling mill 23 rolls the magnesium-based material 70x to a predetermined thickness while
applying a constant tension while rotating in a predetermined direction, and the magnesiumbased material 70x at a predetermined temperature (rolling rollers 21a, 21b, 21c, and 21d). For
example, the thermostat 22 heated to about 300 degreeC) is provided.
[0055]
The rolling rollers 21a, 21b, 21c and 21d can be adjusted to a constant tension through a tension
adjusting mechanism (not shown).
The tension adjustment mechanism is adjusted to a constant tension by an operator or the like
operating the operation panel. In this example, the rolling rollers 21a, 21b, 21c, and 21d can thin
the magnesium-based material 70 within a range of about 1 to 20 μm by rolling each time.
[0056]
The constant temperature bath 22 is a device for heating the magnesium-based material 70x to a
predetermined temperature, and the inside thereof is controlled to a constant temperature by a
temperature controller (not shown). Since magnesium is a close-packed hexagonal crystal,
processing at normal temperature is difficult. For this reason, it rolls, heating at about 200-400
degreeC normally, preferably about 300 degreeC by the thermostat 22. FIG. As a result, the
magnesium-based material 70x that is difficult to plastically deform is easily rolled.
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[0057]
First, the magnesium-based material 70x having a constant thickness is delivered to the rolling
mill 23 by a delivery device (not shown) (arrow s1). Next, while the pair of rolling rollers 21a and
21b rotate in a fixed direction (arrows s2 and s3), the magnesium-based material 70x is rolled to
a predetermined thickness, and the magnesium-based material 70x is introduced into the
constant temperature bath 22. Send out. The magnesium-based material 70x is heated to a
predetermined temperature while passing through the constant temperature bath 22, and is
easily plastically deformed. Next, when the magnesium-based material 70x is fed from the
constant temperature bath 22 to the pair of rolling rollers 21c and 21d, the pair of rolling rollers
21c and 21d rotate in a fixed direction (arrows s4 and s5) Roll 70x again. After the rolling
process 200 described above, the magnesium-based material 70x finally becomes a 50-μm-thick
magnesium-based sheet 24 (arrow s6).
[0058]
In this example, when rolling the magnesium-based material 70x as described above, the rolling
amount per one time is set in a range of about 1 to 20 μm, for the following reason. That is, the
magnesium-based material 70x is a material that is less likely to be plastically deformed because
the amount of sliding deformation is very small compared to other metals. For this reason, if the
rolling amount to be rolled at one time is too large, defects such as cracking, warpage or pinholes
occur in the magnesium-based material 70x due to the influence of residual strain latent in the
magnesium-based material 70x, and the yield It leads to decline. Therefore, in the present
embodiment, the above-mentioned problems are eliminated and the yield is improved by
reducing the rolling amount per one time to about 1 to 20 μm and rolling the magnesium-based
material 70 x a plurality of times.
[0059]
Next, an example of a rolling method for rolling the magnesium-based material 70x in the rolling
process 200 will be described with reference to the table shown in FIG. FIG. 6 is a chart showing
an example of a rolling method when rolling the magnesium-based material 70x to a thickness of
150 μm → 50 μm.
[0060]
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In the example of the rolling method shown in FIG. 6, a magnesium-based material 70x having a
thickness of 150 μm in the initial state is finally made 50 μm thick through a two-step process
of 150 μm → 80 μm and 80 μm → 50 μm. I will.
[0061]
In the initial step of 150 μm → 80 μm, the rolling amount of the magnesium-based material 70
x is made 5 μm each time, and the magnesium-based material 70 x is repeatedly rolled 14 times
by the rolling mill 23.
As a result, the magnesium-based material 70x has a thickness of 80 μm.
[0062]
In the next step of 80 μm → 50 μm, the amount of rolling of the magnesium-based material
70x per time is 3 μm, and the magnesium-based material 70x is repeatedly rolled 10 times by
the rolling mill 23. Thereby, the magnesium-based material 70x has a thickness of 50 μm.
[0063]
As described above, in the example of the rolling method shown in FIG. 6, the magnesium-based
sheet 24 is finally obtained in a thickness of 50 μm by rolling the magnesium-based material
70x a total of 24 times with different rolling amounts.
[0064]
The example of the rolling method shown in FIG. 6 is merely an example, and the rolling method,
the rolling amount per one time, the thickness of the magnesium-based sheet 24, and the like are
not limited to this.
[0065]
Next, referring back to FIG. 4, the obtained magnesium-based sheet 24 is formed by the forming
process P2 according to a known forming method, for example, the frame 8 shown in FIG. 1, the
voice coil bobbin 4, the damper 6, the diaphragm 7, the edge 9. Obtain components for a speaker
device such as the cap 10 and the housing 51.
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[0066]
Next, as shown in FIG. 4 and FIG. 2A, the surface of the obtained component for a speaker device
is subjected to, for example, cationic electrodeposition coating treatment, and the surface of the
magnesium-based sheet 24 is highly elastic. An electrodeposition coating film 73 including a
filler 75 having a percentage is formed to a predetermined thickness (for example, a thickness of
about 6 μm) (electrodeposition coating process P3).
Here, as a material which forms the electrodeposition coating film 73, acrylic resin, an epoxy
resin, etc. are preferable.
The material for forming the electrodeposition coating film 73 is preferably a cationic
electrodeposition paint having an epoxy resin having a sulfonium group as a cationic group and a
propargyl group as a reactive group as a skeleton.
Further, the filler 75 is a material having a high Young's modulus (elastic modulus), for example,
metal oxides such as alumina, heavy metals such as tungsten, nitrides such as aluminum nitride
and boron nitride, and silicates such as talc. It is preferable that it is formed of a material
containing any of the above. Alternatively, the filling amount of the filler 75 can be set to an
amount such that a desired Young's modulus (elastic modulus) can be obtained according to the
target performance in the component for a speaker device, for example, about 0.1 wt% to about
0.1 wt% Preferably, it is set to 50 wt%. If this is less than 0.1 wt%, the remarkable improvement
in Young's modulus of the component for a speaker device can not be expected, and if it is 50
wt% or more, the weight of the component for a speaker device increases and the decrease in
rust resistance becomes large. It is because it is not practical. Further, in this step, in the above
component members for a speaker device, the amount of the filler 75 to be filled in the
electrodeposition coating film 73 is appropriately changed according to need, so that corrosion
resistance and Young's modulus (elastic modulus) can be obtained. Optimal balance can be
achieved. Thus, a speaker device component having the first material structure shown in FIG. 2A
is manufactured.
[0067]
Further, in the present invention, the chemical conversion treatment process P4 or the anodizing
treatment process P4 is provided between the forming process P2 and the electrodeposition
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coating process P3, and the chemical conversion treatment process P4 or the anodizing
treatment process P4 is carried out. A speaker device component having the second material
structure can be manufactured.
[0068]
Specifically, as shown in FIGS. 4 and 2B, the surface of the component member for a speaker
device obtained in the forming step P2 is subjected to chemical conversion treatment or
anodizing treatment to form the surface of the magnesium-based sheet 24. The chemical
conversion film 72 or the anodic oxide film 71 is formed to a predetermined thickness (for
example, a thickness of about 1 μm) (chemical conversion process P4 or anodizing process P4).
In the present invention, various known methods can be applied as a method of chemical
conversion treatment or anodizing treatment.
[0069]
Next, the above-described electrodeposition coating process P3 is performed. Thereby, an
electrodeposition coated film 73 including a filler 75 having a high elastic modulus on the
surface of the chemical conversion film 72 or the anodic oxide film 71 formed on the surface of
the magnesium-based sheet 24 has a predetermined thickness (for example, about 6 μm)
Thickness) is formed (electrodeposition coating process P3). Thus, a speaker device component
having the second material structure shown in FIG. 2 (b) is manufactured.
[0070]
The component member for a speaker device having the first and second material structures
manufactured by the manufacturing method described above can obtain the above-mentioned
effects of the present invention.
[0071]
It is sectional drawing which shows the structure of the speaker apparatus containing the
structural member for speaker apparatuses of this invention.
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It is a principal part enlarged sectional view expanding and showing the section structure of the
constituent member for speaker devices which has the 1st or 2nd material structure of the
present invention. It is a graph which shows an example of the physical-property value of the
said diaphragm when this invention is applied to a diaphragm. It is a flowchart which shows the
manufacturing method of the structural member for speaker apparatuses of this invention. It is a
rolling process figure which shows an example of the rolling process in FIG. It is a chart showing
an example of a rolling method of magnesium system material.
Explanation of sign
[0072]
4 voice coil bobbin 6 damper 7 diaphragm 8 frame 9 edge 10 cap 50 speaker unit 51 case 70,
70x magnesium material 71 anodized film 72 chemical conversion film 73 electrodeposited film
100 speaker device
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