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JP2007129536

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007129536
The present invention provides a diaphragm for an electroacoustic transducer having an
enhanced antirust effect while maintaining the characteristics and the appearance of the
diaphragm, a method of manufacturing the diaphragm for an electroacoustic transducer, and an
electroacoustic transducer. A diaphragm for an electroacoustic transducer is formed by
laminating a lubricating transparent resin layer and a moisture-resistant transparent resin layer
in this order on the surface of a base material 33 containing magnesium as a main component.
The lubricating transparent resin layer 34 is laminated on the surface of the base material 33
mainly composed of magnesium, and then warm molding of the base material 33 on which the
lubricating transparent resin layer 34 is laminated is performed, and then the lubricating
transparent resin layer 34 is formed. A moisture resistant transparent resin layer 35 is laminated
on the surface. [Selected figure] Figure 2
Diaphragm for electro-acoustic transducer, method of manufacturing diaphragm for electroacoustic transducer, and electro-acoustic transducer
[0001]
The present invention relates to a diaphragm for an electroacoustic transducer, a method of
manufacturing a diaphragm for an electroacoustic transducer, and an electroacoustic transducer.
[0002]
Conventionally, as a diaphragm used for an electroacoustic transducer such as a speaker device,
a magnesium diaphragm formed of a metal material containing magnesium as a main component
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is known.
A metallic material containing magnesium as a main component has a larger internal loss than
that using a metallic material having a relatively large specific gravity, such as aluminum or
titanium, and can be an ideal diaphragm. On the other hand, magnesium is more easily rusted
than aluminum and titanium, so the magnesium diaphragm is subjected to surface treatment for
rust prevention. For example, in Patent Document 1, an anodized film is formed on the surface of
the diaphragm, and an electrodeposited film is formed on the anodized film. JP 2005-72641 A
[0003]
However, when an anodized film is formed, fine holes are opened in the surface of the
diaphragm, the strength as the diaphragm is inferior, and there is a problem that the acoustic
characteristics are deteriorated. In addition, when fine holes are opened in the surface of the
diaphragm, there is a problem that the metallic luster of the metal material is lost, and the high
quality feeling of the metal can not be obtained.
[0004]
An object of the present invention is to provide a diaphragm for an electroacoustic transducer
having an enhanced antirust effect while maintaining the characteristics and the appearance of
the diaphragm, a method of manufacturing the diaphragm for the electroacoustic transducer, and
an electroacoustic transducer. .
[0005]
In order to solve the above problems, the invention according to claim 1 is characterized in that a
lubricant transparent resin layer and a moisture resistant transparent resin layer are laminated in
this order on the surface of a base material containing magnesium as a main component. It is a
dexterous diaphragm.
[0006]
The invention according to claim 2 is the diaphragm for an electroacoustic transducer according
to claim 1, wherein the base material contains 2 to 5% of aluminum and 0.5 to 2% of zinc. Do.
[0007]
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The invention according to claim 3 is the diaphragm for an electroacoustic transducer according
to claim 1 or 2, wherein the thickness of the base material is 30 to 150 μm.
[0008]
The invention according to claim 4 is the diaphragm for an electroacoustic transducer according
to any one of claims 1 to 3, wherein the lubricating transparent resin layer is made of polyimide,
polyparaphenylene terephthalamide, or polyether ether. It is characterized in that it is made of
one of ketones.
[0009]
The invention according to claim 5 is a diaphragm for an electroacoustic transducer according to
any one of claims 1 to 4, wherein the layer thickness of the lubricating transparent resin layer is
1.5 to 4 μm. It features.
[0010]
The invention according to claim 6 is a diaphragm for an electroacoustic transducer according to
any one of claims 1 to 5, wherein the moisture-resistant transparent resin layer is made of either
an acrylic resin or an epoxy resin. It features.
[0011]
The invention according to claim 7 is the diaphragm for an electroacoustic transducer according
to any one of claims 1 to 6, wherein the film thickness of the moisture resistant transparent resin
layer is 2 to 6 μm. Do.
[0012]
The invention according to claim 8 is a method for producing a diaphragm for an electroacoustic
transducer according to any one of claims 1 to 7, which comprises a transparent transparent
resin layer on the surface of a base material containing magnesium as a main component. Then,
warm forming of the base material on which the lubricating transparent resin layer is laminated
is performed, and then a moisture resistant transparent resin layer is laminated on the surface of
the lubricating transparent resin layer.
[0013]
The invention according to claim 9 is an electro-acoustic transducer using the diaphragm for an
electro-acoustic transducer according to any one of claims 1 to 7.
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[0014]
According to the present invention, it is possible to provide a diaphragm for an electroacoustic
transducer in which the antirust effect is enhanced while maintaining the characteristics and the
appearance of the diaphragm.
[0015]
Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a side sectional view showing a speaker device 10 in which the diaphragm for
electroacoustic transducer of the present invention is used.
The speaker device 10 includes a frame 11, a speaker grille 12, a yoke 13, a magnet 16, a yoke
17, a diaphragm 30, a voice coil 40 and the like.
[0016]
The frame 11 is formed in a substantially cylindrical shape opened in the front-rear direction,
and holds the yoke 13, the magnet 16, the yoke 17, and the diaphragm 30 inside.
Further, at the front of the frame 11, a speaker grill 12 is provided which closes the front
opening of the frame 11 and protects the diaphragm 30.
[0017]
The yoke 13 is formed in a barrel shape having an open front, and includes a disk-like bottom
portion 14 and a cylindrical portion 15 cylindrically projecting forward from the periphery of the
bottom portion 14.
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The magnet 16 has a cylindrical shape whose outer diameter is smaller than the inner diameter
of the cylindrical portion 15 and is housed in the yoke 13 at a distance from the inner surface of
the cylindrical portion 15.
The front end and the rear end of the magnet 16 are magnetic poles, the rear end of the magnet
16 is bonded to the bottom 14, and the front end is bonded to the yoke 17.
[0018]
The yoke 17 is disposed at the opening of the yoke 13 and is formed in a disk shape having an
outer diameter smaller than the inner diameter of the opening.
The front surface of the yoke 17 is disposed at the front end surface of the yoke 13 and at the
surface position.
The yoke 13 and the yoke 17 are made of a magnetic material, and a magnetic field is formed by
the magnet 16 in the gap between the yoke 13 and the yoke 17.
[0019]
The diaphragm 30 includes a vibrating portion 31 having a dome shape, and an edge 32
provided on an outer peripheral portion of the vibrating portion 31.
The diaphragm 30 is held by the edge 32 at the front portion of the frame 11.
The present invention is applied to the diaphragm 30.
[0020]
The voice coil 40 is provided at the rear of the vibrating unit 31.
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The voice coil 40 includes, for example, a cylindrical coil bobbin 41 made of synthetic resin or
the like, and a coil 42 in which a conducting wire is wound around the outer peripheral surface
of the coil bobbin 41.
The outer diameter of the voice coil 40 is smaller than the inner diameter of the opening of the
yoke 13, and the inner diameter of the voice coil 40 is larger than the outer diameter of the yoke
17. The voice coil 40 is disposed in the gap between the yoke 13 and the yoke 17.
[0021]
An electrical signal is supplied to the lead of the voice coil 40 by the speaker cord 19 through the
terminal board 18 and a wire not shown. Then, the magnetic field of the coil 42 fluctuates, and
the voice coil 40 receives a reaction force from the magnetic field formed in the gap between the
yoke 13 and the yoke 17 and vibrates the vibrating portion 31. The vibration of the vibration
unit 31 propagates to the air and generates a sound according to the frequency of the electrical
signal.
[0022]
Next, the diaphragm 30 will be described in more detail. FIG. 2 is a partial cross-sectional view of
the diaphragm 30. The vibrating portion 31 is formed by sequentially laminating a lubricating
transparent resin layer 34 and a moisture resistant transparent resin layer 35 on the surface.
[0023]
The base material 33 is a metal plate containing magnesium as a main component and preferably
contains 2 to 5% of aluminum and 0.5 to 2% of zinc, and is a magnesium alloy AZ containing 3%
of aluminum and 1% of zinc. It is preferable to use -31.
[0024]
The thickness of the substrate 33 is preferably 30 to 150 μm.
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If the thickness of the substrate 33 is smaller than 60 μm, the rigidity of the diaphragm 30 may
be reduced, and the distortion may be increased. In addition, when the thickness of the substrate
33 is thicker than 150 μm, the substrate 33 becomes heavy, and the acoustic conversion
efficiency decreases.
[0025]
The lubricated transparent resin layer 34 is formed by applying a lubricated transparent resin to
the surface of the base material 33, and has an action of making the mold easily slippery when
the base material 33 is molded. Here, as the lubricant transparent resin, a resin that promotes
slippage with a mold, for example, polyimide, polyparaphenylene terephthalamide (PPTA),
polyetheretherketone (PEEK) or the like can be used. The layer thickness of the lubricating
transparent resin layer 34 is preferably 1.5 to 4 μm. If the thickness is less than 1.5 μm, the
substrate 33 does not slide sufficiently with respect to the mold, and if the thickness is more than
4 μm, the substrate 33 becomes heavy and the acoustic conversion efficiency is reduced.
[0026]
The moisture-resistant transparent resin layer 35 is formed by applying the moisture-resistant
transparent resin to the surface of the lubricated transparent resin layer 34, and exhibits the
anticorrosion effect of the substrate 33. Here, as the moisture-resistant transparent resin, a resin
having good transparency and moisture resistance, for example, an acrylic resin, an epoxy resin
or the like can be used. The thickness of the moisture-resistant transparent resin layer 35 is
preferably 2 to 6 μm. If the thickness is smaller than 2 μm, the corrosion resistance of the base
33 is not sufficient. If the thickness is larger than 6 μm, the base becomes heavy and the
acoustic conversion efficiency decreases.
[0027]
Hereinafter, a method of forming the diaphragm 30 will be described. Here, the diaphragm 30
using AZ-31 as the base material 33, using a polyimide resin as a lubricating transparent resin,
and using an acrylic resin as a moisture-resistant transparent resin will be described.
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[0028]
First, the magnesium alloy AZ-31 to be the base material 33 is rolled so as to have a thickness of
30 to 150 μm to form the base material 33. Next, polyimide resin is applied to both surfaces of
the substrate 33, and the polyimide resin is cured by heat treatment at a temperature (250 ° C.)
higher than the glass transition point of polyimide to form a lubricated transparent resin layer
34.
[0029]
Next, the base material 33 on which the lubricating transparent resin layer 34 is formed on both
sides is warm-formed to form the shape of the diaphragm 30. In warm molding, molding is
performed while heating the substrate 33 on which the lubricated transparent resin layer 34 is
formed on both sides and the mold to about 250 ° C. Since the magnesium crystals in the base
material 33 have a hexagonal close-packed structure, they have anisotropy in the displacement
direction of the crystals and are difficult to form. However, in warm forming, since the shift of
crystals is promoted by heating, the forming becomes easy. In addition, since the lubricating
transparent resin layer 34 which consists of polyimides is provided in the both surfaces of the
base material 33, the base material 33 and a metal mold | die become slippery, and also shaping
| molding becomes easy.
[0030]
After molding, an acrylic resin is applied to the surface of the lubricating transparent resin layer
34 to form a moisture-resistant transparent resin layer 35. Fine cracks and small holes may
occur in the lubricated transparent resin layer 34 during warm forming, but after the warm
forming, an acrylic resin is applied to form the moisture resistant transparent resin layer 35,
whereby the base material 33 is exposed to the outside air. To prevent contact and to obtain anticorrosion effect. In the diaphragm 30 formed in this manner, the corrosion prevention effect can
be enhanced without deteriorating the strength and without reducing the frequency
characteristics and the acoustic characteristics.
[0031]
When a polyimide resin is used as the lubricating transparent resin and a transparent resin such
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as an acrylic resin is used as the moisture-resistant transparent resin, the substrate 33 is a metal
plate containing magnesium as a main component and has metallic luster, and the polyimide
resin is Is a yellowish transparent color, so that a golden appearance can be obtained through the
acrylic resin layer, and the diaphragm 30 can have a high-class feel.
[0032]
In the above embodiment, the present invention is applied to the diaphragm 30 of the domeshaped speaker device 10, but the present invention is not limited to this, and for example, the
present invention is not limited to this. The invention may be applied, or the invention may be
applied to a diaphragm of a microphone.
[0033]
Hereinafter, the present invention will be described in more detail by way of examples.
[0034]
After rolling the magnesium alloy AZ-31 into a plate having a thickness of 60 μm, a polyimide
resin was applied on both sides and cured by heat treatment.
Next, a plate-like magnesium alloy on which a polyimide resin layer was formed was formed into
a dome by warm forming, and an acrylic resin was applied on both sides.
Thereafter, the outer shape of the dome-shaped magnesium alloy in which the polyimide resin
layer and the acrylic resin layer were formed was cut into a diameter of φ 20 mm to form a
dome-shaped diaphragm.
[0035]
Comparative Example 1 After magnesium alloy AZ-31 was rolled into a plate having a thickness
of 60 μm, it was formed into a dome shape by warm forming.
Thereafter, the outer shape of the dome-shaped magnesium alloy was cut into a diameter of φ20
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mm to form a dome-shaped diaphragm. The polyimide resin layer and the acrylic resin layer
were not formed.
[0036]
FIG. 3 is a diagram showing frequency characteristics of a speaker device (see FIG. 1) using the
diaphragms of Example 1 and Comparative Example 1. The diaphragms of Example 1 and
Comparative Example 1 exhibit substantially the same frequency characteristics, and it can be
seen that the characteristic deterioration due to the formation of the polyimide resin layer and
the acrylic resin layer is not seen.
[0037]
A polyimide resin layer and an acrylic resin layer were formed on both sides of a thin sheet of
magnesium alloy AZ-31, cut into strips, and acoustic characteristics were measured by a
vibration lead method.
[0038]
<Comparative example 2> The thin plate (The polyimide resin layer and the acrylic resin layer
are not formed) of magnesium alloy AZ-31 was cut | disconnected in strip shape, and the
acoustic characteristic was measured by the vibration lead method.
[0039]
Table 1 shows the measurement results of acoustic characteristics.
[0040]
The diaphragms of Example 2 and Comparative Example 2 exhibit substantially the same
acoustic characteristics, and it can be seen that the characteristic deterioration due to the
formation of the polyimide resin layer and the acrylic resin layer is not seen.
[0041]
A base material 150 μm thick was prepared using magnesium alloy AZ-31, and a polyimide
resin was applied on both sides, and after warm forming, an acrylic resin was further applied to
prepare a cone-shaped diaphragm having a diameter of 104 mm.
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[0042]
Comparative Example 3 A 150 μm-thick base material was produced using magnesium alloy AZ31, and a cone-shaped diaphragm having a diameter of 104 mm was produced by warm forming.
No surface treatment was performed.
[0043]
A rust test was conducted in which the diaphragms of Example 3 and Comparative Example 3
were kept under high temperature and humidity conditions (60 ° C., 95%) for 144 hours.
As a result, in the diaphragm of Comparative Example 3, a large number of thread-like rusts were
generated.
On the other hand, in the diaphragm of Example 3, no filamentous rust was generated.
[0044]
1 is a side sectional view showing a speaker device 10 to which the present invention is applied.
FIG. 6 is a partial cross-sectional view of a diaphragm 30.
It is a figure which shows the frequency characteristic of the speaker apparatus 10 using the
diaphragm of Example 1 and Comparative Example 1. FIG.
Explanation of sign
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[0045]
DESCRIPTION OF SYMBOLS 10 Speaker apparatus (electro-acoustic transducer) 30 Diaphragm
(diaphragm for electro-acoustic transducer) 33 Base material 34 Lubrication transparent resin
layer 35 Moisture-proof transparent resin layer
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