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JP2008034909

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DESCRIPTION JP2008034909
[PROBLEMS] To provide a speaker device component and the like capable of improving corrosion
resistance, heat resistance, and the like. A component for a speaker device is formed of a
magnesium-based material obtained by adding calcium to magnesium or a magnesium alloy.
Here, the component for a speaker device can be a frame, a voice coil bobbin, a damper, a
diaphragm, an edge, a cap, a housing, and the like. In a preferred example, the amount of calcium
added to magnesium or magnesium alloy is preferably 0.1 to 50 wt%. As a result, the surface of
the magnesium-based material is covered with a fine and smooth calcium oxide film. Therefore,
the component for a speaker device is blocked from binding to oxygen in the atmosphere, and is
less likely to rust and to be less likely to burn. As a result, the corrosion resistance and the heat
resistance can be improved as compared with the material consisting of magnesium alone.
[Selected figure] Figure 2
Component member for speaker device and speaker device
[0001]
The present invention relates to a material structure of a component for a speaker device.
[0002]
In general, the speaker device is composed of various components for the speaker device such as
a diaphragm, an edge, a frame, a damper, a voice coil bobbin, a cap and a housing.
10-05-2019
1
As such a component member for a speaker device, a magnesium diaphragm made of magnesium
is known. Such a magnesium diaphragm has characteristics such as light weight and high
internal loss, and so is suitably used as a speaker device for high frequency reproduction such as
tweeter.
[0003]
Further, since magnesium has the property of being easily oxidized, the surface of the
magnesium diaphragm is usually subjected to moisture-proof treatment such as anodizing
treatment or electrodeposition coating treatment in many cases. This has the advantage that the
corrosion resistance of the magnesium diaphragm can be improved.
[0004]
For example, Patent Documents 1 and 2 describe an example of a magnesium diaphragm in
which an anodic oxide film or an electrodeposition coating film (for example, an acrylic resin
film) is formed on the surface of a magnesium material for such purpose. There is.
[0005]
JP, 2005-072641, A JP, 11-236698, A
[0006]
However, since the electrodeposition coating film made of the above-mentioned acrylic resin has
a low Young's modulus, when such an electrodeposition coating film is formed on the surface of
the above-mentioned magnesium diaphragm, the Young's modulus of the diaphragm decreases.
There is a problem of
[0007]
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 and a speaker device
capable of improving corrosion resistance, heat resistance and the like.
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[0008]
The invention according to claim 1 is a component member for a speaker device, characterized in
that it is formed of a magnesium-based material obtained by adding calcium to magnesium or a
magnesium alloy.
[0009]
In one embodiment of the present invention, the speaker device component is formed of a
magnesium-based material obtained by adding calcium to magnesium or a magnesium alloy.
[0010]
The above component member for a speaker device is formed of a magnesium-based material
obtained by adding calcium to magnesium or a magnesium alloy.
Here, the component for a speaker device can be a frame, a voice coil bobbin, a damper, a
diaphragm, an edge, a cap, a housing, and the like.
In a preferred example, the addition amount of calcium to magnesium or magnesium alloy is
preferably 0.1 wt% (wt%) to 50 wt% (wt%).
[0011]
For this reason, the surface of the magnesium-based material is covered with a fine and smooth
calcium oxide film.
[0012]
With such a material structure, the component for a speaker device made of a magnesium-based
material is blocked from binding to oxygen in the atmosphere, and is less likely to rust.
As a result, the corrosion resistance can be improved as compared with a material consisting of
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3
magnesium alone.
[0013]
In this regard, actually, a magnesium-based material (comparative example 1) made of
magnesium alloy AZ31 and a speaker device component made of the above-mentioned
magnesium-based material are used, and salt water is applied to a certain range of both of them.
When the above-mentioned component for a speaker device was carried out, the abovementioned component for a speaker device had few corrosion parts in the part within the certain
range compared with Comparative Example 1, and the progress rate of rusting was about 1/3 or
less I was able to reduce it.
[0014]
In addition, due to such a material structure, the component for a speaker device made of a
magnesium-based material is blocked from binding to oxygen in the atmosphere, and becomes
difficult to burn.
Therefore, heat resistance can be improved as compared with a material consisting of
magnesium alone.
As a result, it becomes possible to supply a larger input audio signal to the speaker unit which is
a component of the speaker device from the amplifier side, and to improve the safety of the
speaker unit with respect to heat resistance and the like. it can.
[0015]
In this regard, when the ignition temperature was actually measured using a magnesium-based
material (comparative example 2) made of a magnesium alloy and the component member for a
speaker device made of the above-mentioned magnesium-based material, the above-mentioned
configuration for a speaker device The member was able to raise the ignition temperature by
about 200 to 300 ° C. relative to Comparative Example 2.
[0016]
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In addition, since it is possible to improve the corrosion resistance as described above, it is
unnecessary to form or thin a film such as an electrodeposition coating film made of a resin
system on the surface of the magnesium based material. The Young's modulus of the component
member for a speaker device can be improved.
Therefore, when the component member for a speaker device is a diaphragm, it is possible to
construct a thin and light diaphragm for high-range reproduction.
As a result, the natural frequency of the diaphragm can be increased, and the frequency
characteristics of the middle to high frequency range in the speaker device can be improved.
[0017]
In one aspect of the above component member for a speaker device, a film is formed on the
surface of the magnesium-based material. Thereby, corrosion resistance, heat resistance, etc. can
be further improved. In particular, in this aspect, the corrosion resistance of the magnesiumbased material itself is improved, so that the amount of the film formed on the surface of the
magnesium-based material can be reduced in the surface treatment step. Cost reduction can be
achieved.
[0018]
In another aspect of the above component for a speaker device, the film is a film formed of any of
or a combination of a chemical conversion film, an anodic oxide film, an electrodeposition
coating film, a spray coating film, a sputtering film, and a plating film. Is preferred. Thereby, the
designability etc. of the structural member for speaker devices can also be improved. In
particular, in this aspect, the corrosion resistance of the magnesium-based material itself is
improved, so the amount of the electrodeposition coating film on the surface of the film can be
reduced in the electrodeposition coating process, and the speaker device The cost of the
component parts can be reduced.
[0019]
In another embodiment of the present invention, a speaker device provided with the abovedescribed component device for a speaker device can be configured.
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[0020]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings.
[0021]
[Configuration of Speaker Device] FIG. 1 is a cross-sectional view of the speaker device 100
including the component for a speaker device according to the embodiment of the present
invention, cut along a plane passing through the central axis L1.
[0022]
The speaker device 100 includes, as shown in FIG. 1, 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 components for the speaker device are not limited to the
configuration and the like described below.
[0023]
The speaker unit 50 is configured to include a magnetic circuit and a vibration system member.
[0024]
The magnetic circuit includes a yoke 1 including a columnar 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.
Between the pole portion 1 a and the plate 3, a magnetic gap 30 in which the magnetic flux of
the magnet 2 is concentrated is formed.
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[0025]
The vibration system members include the voice coil bobbin 4, the voice coil 5, the damper 6, the
diaphragm 7, the frame 8, the edge 9, and the cap 10.
[0026]
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.
[0027]
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 an 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.
[0028]
The voice coil 5 has a pair of positive and negative lead wires (not shown) and is wound around
the lower end of the outer peripheral wall of the voice coil bobbin 4.
For this reason, the voice coil 5 is disposed in the magnetic gap 30. Here, the lead on the positive
side is an input wiring of the L (or R) channel signal, and the lead on the negative side is an input
wiring of the ground (GND: ground) signal. Each lead wire is electrically connected to a pair of
plus and minus tinsel wires (not shown), and each tinsel wire is a speaker device terminal (not
shown) provided at an appropriate position of the frame 8 Are electrically connected to each
other. The speaker device terminal is also electrically connected to a pair of positive and negative
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output wires on the amplifier side. As a result, a signal and power for one channel (hereinafter,
also simply referred to as "audio current") are input to the voice coil 5 from the amplifier side.
[0029]
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.
[0030]
The diaphragm 7 is a member having a cone shape and having a function of emitting an acoustic
wave according to an input signal. The inner peripheral edge portion of the diaphragm 7 is
attached to the upper end portion of the outer peripheral wall of the voice coil bobbin 4.
[0031]
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 9 at an appropriate position.
[0032]
The cap 10 has a dome shape, and has a function of preventing dust and the like from intruding
into the inside of the speaker unit 50. The cap 10 is attached to the sound emitting surface side
of the diaphragm 7 in a state of being disposed at a position covering the upper surface side of
the voice coil bobbin 4.
[0033]
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The housing 51 is a member having a function of housing and fixing the speaker unit 50.
[0034]
In the speaker device 100 having the above configuration, the audio current output from the
amplifier side passes through the speaker device terminal, the pair of plus and minus tinsel wires,
and the pair of plus and minus lead wires of the voice coil 5. , Are input to the voice coil 5.
As a result, based on Fleming's left-hand rule, a driving force is generated in the voice coil 5 in
the magnetic gap 30, and the diaphragm 7 is vibrated in the direction of the central axis L1 of
the speaker device 100. Thereby, a sound wave is emitted through the diaphragm 7 in the
direction of the arrow Y1.
[0035]
(Material Structure of Constituent Member for Speaker Device) In the speaker device 100 having
the above-described configuration, in the present invention, the frame 8, the voice coil bobbin 4,
the damper 6, the diaphragm 7, the edge 9, the cap 10, the housing 51, etc. The present
invention is characterized by the material structure of the component device for the speaker
device. Hereinafter, the material structure of the component member for a speaker device will be
described.
[0036]
In general, magnesium is easily oxidized and has corrosion resistance as well as being easily
ignited.
[0037]
In this respect, as shown in FIG. 2A, the component member for a speaker device according to
the embodiment of the present invention is formed of a magnesium-based material 70 obtained
by adding calcium to magnesium or a magnesium alloy, and is a single layer Make a structure.
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In a preferred example, the amount of calcium added to magnesium or magnesium alloy is
preferably about 0.1 to about 50 wt% (wt%).
[0038]
For this reason, the surface of the magnesium-based material 70 is covered with a fine and
smooth calcium oxide film.
[0039]
With such a material structure, the magnesium-based material 70 is blocked from binding to
oxygen in the atmosphere, and becomes difficult to rust.
As a result, the corrosion resistance can be improved as compared with a material consisting of
magnesium alone.
[0040]
In this regard, actually, using a magnesium-based material (comparative example 1) made of
magnesium alloy AZ31 and the magnesium-based material 70 according to the present
embodiment, salt water is sprayed to a predetermined range of both of them. When the test was
carried out, compared with Comparative Example 1, this Example had few corrosion parts in the
part within the certain range, and could suppress the progress rate of rusting to about 1/3 or
less.
[0041]
Further, due to the material structure, the magnesium-based material 70 is blocked from binding
to oxygen in the atmosphere, and becomes difficult to burn.
Therefore, heat resistance can be improved as compared with a material consisting of
magnesium alone. As a result, it is possible to supply an audio signal with a larger input to the
speaker unit 50 from the amplifier side, and it is possible to improve the safety regarding the
heat resistance and the like of the speaker unit 50.
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[0042]
Regarding this point, when the ignition temperature was actually measured using a magnesiumbased material (comparative example 2) made of a magnesium alloy and the magnesium-based
material 70 according to the present example, the present example corresponds to comparative
example 2 In contrast, the ignition temperature could be raised by about 200 to 300 ° C.
[0043]
In addition, since it is possible to improve the corrosion resistance as described above, it is
unnecessary to form or thin a film such as an electrodeposition coating film made of a resin
system on the surface of the magnesium-based material 70. Can improve the Young's modulus of
Therefore, when the component member for a speaker device is the diaphragm 7, it is possible to
configure the diaphragm 7 for thin and light high-frequency range reproduction. As a result, the
natural frequency of the diaphragm 7 can be increased, and the frequency characteristics of the
middle to high range in the speaker device 100 can be improved.
[0044]
In the present invention, the material structure of the speaker device component is not limited to
that described above.
[0045]
That is, in another embodiment of the present invention, as shown in FIG. 2B, a film 71 can be
formed on the surface of the magnesium-based material 70 to form a multilayer structure.
In a preferred example, the film 71 is preferably a film formed of a chemical conversion film, an
anodic oxide film, an electrodeposition coating film, a spray coating film, a sputtering film, a
plating film, or a combination thereof. Thereby, the corrosion resistance can be further improved.
In particular, in the present embodiment, the corrosion resistance of the magnesium-based
material 70 itself is improved, so that the amount (thickness d1) of the film 71 formed on the
surface of the magnesium-based material 70 can be reduced in the surface treatment step. As a
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result, the cost of the speaker device component can be reduced.
[0046]
Further, in still another embodiment of the present invention, as shown in FIG. 2C, an
electrodeposition coating film 72 can be further formed on the surface of the film 71 to form a
multilayer structure. When the film 71 is an electrodeposition coating film or the like, it is not
necessary to overlap the electrodeposition coating film 72 on the surface of the film 71. Thereby,
the designability etc. of the structural member for speaker devices can also be improved. In
particular, in the present embodiment, the corrosion resistance of the magnesium-based material
70 itself is improved, so the amount (thickness d2) of the electrodeposition coating film 72 on
the surface of the film 71 is reduced in the electrodeposition coating process. As a result, the cost
of the speaker device component can be reduced.
[0047]
[Method of Manufacturing Component for Speaker Device] Next, a method of manufacturing a
component for speaker device to which the present invention is applied will be described with
reference to FIGS. 3 and 4 and the like. FIG. 3 is a flowchart showing a method of manufacturing
a component for a speaker device to which the present invention is applied. FIG. 4 shows a
rolling process diagram corresponding to the rolling process P1 in FIG.
[0048]
First, a magnesium-based material 70 having a predetermined thickness and formed by adding
calcium to magnesium or a magnesium alloy is rolled to a desired thickness by a rolling process
200, and a sheet-like magnesium-based sheet 24 having a predetermined thickness is obtained.
Obtained (rolling process P1).
[0049]
In a preferred example, the magnesium-based sheet 24 is preferably formed by rolling a
magnesium-based material 70 obtained by adding 2 wt% of calcium to the magnesium alloy
AZ61 to a thickness of about 0.044 mm.
[0050]
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Here, an example of the rolling process 200 will be described.
[0051]
The rolling mill 23 rolls the magnesium-based material 70 to a predetermined thickness while
applying a constant tension while rotating in a fixed direction, and brings the magnesium-based
material 70 to a predetermined temperature. And a thermostatic chamber 22 for heating.
[0052]
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.
[0053]
The constant temperature bath 22 is a device for heating the magnesium-based material 70 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 is preferable to roll while heating to about 200 to about 400 ° C., preferably
about 300 ° C., by the constant temperature bath 22. As a result, the magnesium-based material
70 which is not easily plastically deformed is easily rolled.
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[0054]
Next, the flow of the rolling process 200 will be described. First, the magnesium-based material
70 having a constant thickness is delivered to the rolling mill 23 by a delivery device (not shown)
(arrow s1). Next, while the rolling rollers 21a and 21b rotate in a fixed direction (arrows s2 and
s3), the magnesium-based material 70 is rolled to a predetermined thickness, and the
magnesium-based material 70 is fed into the constant temperature bath 22. The magnesiumbased material 70 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 70 is delivered from the constant temperature bath 22 to the rolling rollers 21c and
21d, the rolling rollers 21c and 21d rotate in a fixed direction (arrows s4 and s5) to roll the
magnesium-based material 70 again. Do. Then, the magnesium-based material 70 is repeatedly
rolled a plurality of times at different rolling amounts by the above-described rolling method to
finally obtain a magnesium-based sheet 24 having a desired thickness (arrow s6).
[0055]
In this example, when rolling the magnesium-based material 70 as described above, the rolling
amount for each rolling is in the range of about 1 to 20 μm, for the following reasons. That is,
the magnesium-based material 70 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, problems such as cracking,
warping, or pinholes occur in the magnesium-based material 70 due to the influence of residual
strain latent in the magnesium-based material 70, and 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 a plurality of times.
[0056]
The above-described example of the rolling method is merely an example, and the rolling
method, the rolling amount for each rolling, the thickness of the magnesium-based sheet 24, and
the like are not limited thereto.
[0057]
Next, referring back to FIG. 3, the obtained magnesium-based sheet 24 is molded by a known
method according to a molding process, for example, the frame 8 shown in FIG. 1, the voice coil
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bobbin 4, the damper 6, the diaphragm 7, the edge 9, The components for a speaker device such
as the cap 10 and the housing 51 are obtained (molding step P2).
[0058]
Next, a dense and high elastic modulus film 71, for example, a chemical conversion film, an
anodic oxide film, an electrodeposition coating film, a spray coating film, a sputtering film, is
formed on the surface of the speaker device component by a known surface treatment process. A
film of any or a combination of plating films is formed to a predetermined thickness, for example,
about 0.001 mm (surface treatment step P3).
In the surface treatment step P3, an electrodeposition coating film 72 can also be formed on the
surface of the film 71 by the electrodeposition coating process by providing a known
electrodeposition coating process.
Here, when the film 71 is an electrodeposition coating film or the like, it is not necessary to
overlap the electrodeposition coating film 72 on the surface of the film 71.
[0059]
Through the above-described steps, the component member for a speaker device, which is a
feature of the present invention, is manufactured. According to the manufacturing method of the
component member for a speaker device manufactured in this way, the above-mentioned
becomes possible.
[0060]
It is sectional drawing which shows the structure of the speaker apparatus containing the
structural member for speaker apparatuses of this invention. It is the partial expanded sectional
view which expands and shows the various raw material structures of the structural member for
speaker apparatuses of this invention. 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.
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Explanation of sign
[0061]
4 voice coil bobbin 6 damper 7 diaphragm 8 frame 9 edge 10 cap 50 speaker unit 51 case 70
magnesium material 71 film 72 electrodeposited film 100 speaker device
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