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JP2005094422

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DESCRIPTION JP2005094422
A speaker device and a method of manufacturing the same for improving the corrosion
resistance without rust-proofing a cut surface of a trimmed magnesium diaphragm. In a press
forming process, a magnesium base material is formed into a shape of a diaphragm 3. The
surface of the magnesium base is surface-treated, and the magnesium base after the surface
treatment is trimmed to manufacture the cone-shaped diaphragm 3. The peripheral portion of
the trimmed diaphragm and the edge 10 are fixed with an adhesive, and the cut surface in the
vicinity of the peripheral portion of the diaphragm is coated with an adhesive. In the speaker
device forming step, the other peripheral portion of the diaphragm 3 is fixed to the voice coil
bobbin 5 and the damper 4 with an adhesive, and the cut surface in the vicinity of the other
peripheral portion of the diaphragm is covered with an adhesive. The contact between the cut
surface and the air is cut off, and the corrosion resistance of the cut surface is improved without
rustproofing treatment. Since the anticorrosion treatment step is omitted, it is possible to reduce
the number of steps and the manufacturing cost of the speaker device. [Selected figure] Figure 5
Speaker apparatus and method of manufacturing the same
[0001]
The present invention relates to a speaker device provided with a magnesium diaphragm having
low cost and excellent rust resistance, and a method of manufacturing the same.
[0002]
In recent years, as a diaphragm for a speaker device, a magnesium diaphragm having
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characteristics such as high internal loss and high sound velocity and capable of obtaining
excellent acoustic characteristics has attracted attention.
However, magnesium is easily oxidized and has a property that rusting is more likely to occur
than aluminum and titanium conventionally used as a material of a diaphragm for a speaker
device.
[0003]
Therefore, in general, when manufacturing a magnesium diaphragm, surface treatment is
performed to prevent the generation of rust on the magnesium diaphragm in the manufacturing
process. In one example of a method of manufacturing such a magnesium diaphragm, first, a
magnesium base is formed into a diaphragm shape by a press, then the surface of the magnesium
base formed into the diaphragm shape is surface-treated, and then A magnesium diaphragm is
manufactured by trimming (punching) the base material of magnesium which is a molded article
on which the surface treatment has been completed.
[0004]
Moreover, there are the following as manufacturing methods according to other magnesium
diaphragms. For example, in order to prevent the speaker diaphragm made of a magnesium sheet
or a magnesium alloy sheet from being oxidized, a method of manufacturing a speaker
diaphragm having a step of forming an anticorrosive film on the speaker diaphragm has been
proposed. (See, for example, Patent Document 1).
[0005]
According to the method of manufacturing the speaker diaphragm, first, a wire or rod of
magnesium or magnesium alloy is rolled into a sheet material by the cross rolling method, and
then the sheet material is subjected to pressure vibration forming method for cone speaker
vibration Form the plate. Next, in the manufacturing method, the outer edge portion of the
speaker diaphragm is trimmed, and then the anti-reflection coating layer is formed by baking and
coating an epoxy resin primer or an acrylic resin paint on the speaker diaphragm. . Thus, the
speaker diaphragm is prevented from being oxidized.
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[0006]
An oxide ceramic film is formed by plasma chemical anodizing on magnesium or magnesium
alloy, and a cationic electrodeposition coating film is formed on the oxide ceramic film. The
surface treatment method to obtain is known (for example, refer patent document 2).
[0007]
However, in the method of manufacturing a magnesium diaphragm described above, the
magnesium base material shaped into the shape of the diaphragm is surface-treated and then
trimmed to manufacture a magnesium diaphragm. Therefore, after the trimming processing step
It is necessary to carry out an anticorrosion treatment on the cut surface of the magnesium
diaphragm by trimming in the process.
Therefore, although the method of manufacturing a magnesium diaphragm described above can
prevent the occurrence of rust on the magnesium diaphragm etc., it is necessary to add a
rustproofing process to the post-process after the trimming process, and the number of manhours With the increase, there is a problem that the manufacturing cost of the speaker device
increases.
[0008]
JP, 2002-369284, A JP, 2000-345370, A
[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 provided with a magnesium
diaphragm in which the rustproofing is improved without rustproofing the cut surface of the
trimmed magnesium diaphragm, and a method of manufacturing the same.
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[0010]
The invention according to claim 1 includes a magnesium diaphragm manufactured by trimming
a base material of magnesium, and a support member for supporting the magnesium diaphragm,
and the peripheral portion of the magnesium diaphragm is made of an adhesive. It is fixed to the
support member, and the cut surface of the magnesium diaphragm by the trimming is covered
with the adhesive.
[0011]
The invention according to claim 5 comprises a forming step of forming a magnesium base, a
trimming step of trimming the magnesium base formed by the forming step to produce a
magnesium diaphragm, and the magnesium diaphragm And a fixing step of fixing the peripheral
portion and the supporting member with an adhesive, wherein the fixing step covers the cut
surface of the magnesium diaphragm in the trimming step with an adhesive.
[0012]
In one aspect of the present invention, the speaker device includes a magnesium diaphragm
manufactured by trimming a base material of magnesium, and a support member for supporting
the magnesium diaphragm, and a peripheral portion of the magnesium diaphragm is It is
adhered to the support member by an adhesive, and the cut surface of the magnesium diaphragm
by the trimming is coated with the adhesive.
[0013]
According to the above speaker device, since the cut surface of the magnesium diaphragm by the
trimming is coated with the adhesive, the contact between the cut surface and oxygen in the air
is completely blocked.
Therefore, it can prevent that a rust generate | occur | produces in the cut surface.
For this reason, the rustproofness can be improved without subjecting the cut surface to
rustproofing.
[0014]
In one aspect of the above speaker device, in the speaker device, the magnesium diaphragm is a
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cone-shaped magnesium diaphragm having a first peripheral edge and a second peripheral edge,
and the support member is an edge, A voice coil bobbin and a damper are included, the first
peripheral edge is fixed to the edge, and the second peripheral edge is fixed to the voice coil
bobbin and the damper.
[0015]
According to this aspect, the speaker device includes the cone-shaped magnesium diaphragm
having the first peripheral edge and the second peripheral edge.
The first peripheral edge of the magnesium diaphragm is fixed to the edge with an adhesive, and
the cut surface of the magnesium diaphragm near the first peripheral edge is covered with an
adhesive.
On the other hand, the second peripheral edge of the magnesium diaphragm is fixed to the voice
coil bobbin and the damper with an adhesive, and the cut surface of the magnesium diaphragm
near the second peripheral edge is covered with an adhesive. Thus, the contact between the cut
surfaces and oxygen in the air can be completely cut off, and the generation of rust on the cut
surfaces can be prevented. For this reason, the rustproofing can be improved without subjecting
the cut surfaces to rustproofing.
[0016]
In another aspect of the above speaker device, the magnesium diaphragm is a semi-dome shaped
magnesium diaphragm or a dome-shaped magnesium diaphragm, and the support member
includes a frame and a packing.
[0017]
According to this aspect, the speaker device includes the semi-dome shaped or dome shaped
magnesium diaphragm.
The peripheral portion of the semi-dome-shaped or dome-shaped magnesium diaphragm is fixed
to the frame or the packing with an adhesive, and the cut surface of the magnesium diaphragm in
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the vicinity of the peripheral portion is covered with the adhesive. Therefore, the contact
between the cut surface and oxygen in the air is completely blocked, and the generation of rust
on the cut surface can be prevented. For this reason, the rustproofness can be improved without
subjecting the cut surface to rustproofing.
[0018]
In another aspect of the above speaker device, a recess is formed in one end face of the frame
along the circumferential direction, and a peripheral portion of the magnesium diaphragm is
fitted to the recess and is adhesively bonded in the recess It is fixed.
[0019]
According to this aspect, the peripheral portion of the magnesium diaphragm is fitted in the
recess and is fixed by the adhesive in the recess, and the cut surface of the magnesium
diaphragm by trimming is covered with the adhesive. The contact between the cut surface of the
magnesium diaphragm and oxygen in the air is completely cut off, and the generation of rust on
the cut surface can be prevented.
For this reason, the rustproofness can be improved without subjecting the cut surface to
rustproofing.
[0020]
According to another aspect of the present invention, a method of manufacturing a speaker
device includes a forming step of forming a magnesium base, and a trimming step of trimming a
magnesium base formed by the forming step to manufacture a magnesium diaphragm. And a
fixing step of fixing the peripheral portion of the magnesium diaphragm and the support member
with an adhesive. The fixing step covers the cut surface of the magnesium diaphragm in the
trimming step with an adhesive.
[0021]
According to the above-described method for manufacturing a speaker device, it is possible to
form a magnesium base having a shape of a diaphragm by pressing a plate-like or sheet-like
magnesium base in the forming step.
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Subsequently, in the trimming step, the magnesium diaphragm can be manufactured by trimming
(extracting) the magnesium base formed into the shape of the diaphragm. Subsequently, in the
fixing step, the magnesium diaphragm can be attached to the support member by fixing the
peripheral portion of the magnesium diaphragm and the support member with an adhesive.
[0022]
Further, at this time, in the fixing step, the cut surface of the magnesium diaphragm in the
trimming step is covered with the adhesive, so that the generation of rust can be prevented
without applying an anticorrosion treatment to the cut surface. . Thereby, the antirust property
of the cut surface can be improved. Therefore, the speaker apparatus provided with the high
quality magnesium diaphragm excellent in rustproofing can be manufactured. Further, in the
present manufacturing method, since the anticorrosion treatment step is omitted after the
trimming step, the number of man-hours can be reduced, and the manufacturing cost of the
speaker device can be reduced.
[0023]
In one aspect of the above-described method of manufacturing a speaker device, the method
further includes, between the forming step and the trimming step, a surface treatment step of
treating the surface of the formed magnesium base material. Thereby, the entire surface of the
base material of magnesium can be rustproofed.
[0024]
In another aspect of the above-described method for manufacturing a speaker device, the
magnesium diaphragm is a cone-shaped magnesium diaphragm, and the support member is an
edge, a voice coil bobbin, and a damper.
[0025]
According to this aspect, it is possible to manufacture a cone-shaped magnesium diaphragm, and
one peripheral edge portion of the cone-shaped magnesium diaphragm and the edge are fixed by
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the adhesive with the adhesive.
Further, according to this aspect, the other peripheral portion of the cone-shaped magnesium
diaphragm, the voice coil bobbin, and the damper are fixed by the adhesive. At this time, the cut
surfaces in the vicinity of one and the other peripheral portions of the cone-shaped magnesium
diaphragm are completely covered with the adhesive along the circumferential direction of the
diaphragm. Therefore, the contact between the cut surface of the cone-shaped magnesium
diaphragm and oxygen in the air is completely blocked, and the generation of rust on the cut
surface can be prevented. For this reason, the rustproofness can be improved without subjecting
the cut surface to rustproofing.
[0026]
In another embodiment of the above-described method for manufacturing a speaker device, the
magnesium diaphragm is a semi-dome shaped magnesium diaphragm or a dome-shaped
magnesium diaphragm, and the support member is a frame and a packing.
[0027]
According to this aspect, it is possible to manufacture a semi-dome-shaped or dome-shaped
magnesium diaphragm, and the peripheral portion of the semi-dome-shaped or dome-shaped
magnesium diaphragm and the frame or the packing are fixed by an adhesive. .
At this time, the cut surface in the vicinity of the peripheral portion of the semi-dome shaped or
dome shaped magnesium diaphragm is completely covered with the adhesive along the
circumferential direction of the diaphragm. Therefore, the contact between the cut surface of the
semi-dome shaped or dome shaped magnesium diaphragm and the oxygen in the air is
completely blocked, and the generation of rust on the cut surface can be prevented. For this
reason, the rustproofness can be improved without subjecting the cut surface to rustproofing.
[0028]
In another aspect of the above-described method of manufacturing the speaker device, a recess is
formed along one of the end faces of the frame along the circumferential direction, and in the
fixing step, the peripheral portion of the magnesium diaphragm is fitted to the recess And fixed
by an adhesive in the recess.
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[0029]
According to this aspect, the recess is formed along the circumferential direction on one end
surface of the frame.
Then, in the fixing step, the peripheral portion of the magnesium diaphragm is fitted in the recess
formed in the frame and fixed in the recess by the adhesive. Thus, the magnesium diaphragm can
be accurately positioned with respect to the frame, and the magnesium diaphragm and the frame
are firmly bonded.
[0030]
Further, since the cut surface of the magnesium diaphragm is completely covered with the
adhesive in the recess, the contact between the cut surface and oxygen in the air is completely
blocked. Thereby, generation | occurrence | production of rust can be prevented, without giving
an antirust process to the cut surface. Therefore, the corrosion resistance of the cut surface can
be improved.
[0031]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0032]
The present invention provides a speaker device provided with a magnesium diaphragm in which
the corrosion resistance of the cut surface is improved without rusting the cut surface of the
trimmed magnesium diaphragm with a paint or the like, and a method of manufacturing the
same.
Hereinafter, a speaker device including the magnesium diaphragm and a method of
manufacturing the same will be described.
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[0033]
First Embodiment FIG. 1 shows a method of manufacturing a speaker device provided with a
cone-shaped magnesium diaphragm. The speaker device is manufactured by the press forming
step s1, the surface treatment step s2, the trimming step s3, the edge attaching step s4, and the
speaker device forming step s5.
[0034]
In the press-forming step s1, a plate-like or sheet-like magnesium substrate is pressed by a
pressing device to produce a cone-shaped magnesium substrate. FIG. 2 shows how a cone-shaped
magnesium base material is formed by the press forming step s1. Hereinafter, with reference to
FIG. 2, the method to shape | mold a cone-shaped magnesium base material by press-forming
process s1 is demonstrated. In the press forming step s1, a cone-shaped magnesium base 55 is
manufactured by the delivery reel 50, the pair of rollers 51, the heating device 52 such as a
heater, and the press device 53 (see the broken line portion).
[0035]
The delivery reel 50 winds a plate-like or sheet-like magnesium substrate 54 for a certain length,
and delivers the wound magnesium substrate 54 to a pair of rollers 51 (see arrow Y1).
Subsequently, the pair of rollers 51 is rotationally driven in the direction of the arrow Y2, and
delivers the magnesium base material 54 delivered from the delivery reel 50 to the pressing
device 53 side at a constant speed. Subsequently, the heating device 52 heats the magnesium
base 54 fed by the pair of rollers 51 to a certain temperature, for example, a temperature higher
than a recrystallization temperature which facilitates plastic working of the magnesium base 54.
Subsequently, the pressing device 53 presses the magnesium base 54 heated by the heating unit
52 to form a cone-shaped magnesium base 55.
[0036]
Specifically, the pressing device 53 lowers the upper mold 53a inside thereof from the upper
position to the lower mold 53b (see arrow Y3), and the magnesium base 54 heated to a constant
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temperature is obtained. Is pressed by the upper mold 53a and the lower mold 53b. Thus, a
cone-shaped magnesium base 55 is formed. In the press device 53, the upper mold 53a and the
lower mold 53b are used as a mold for molding the cone-shaped magnesium base 55. However,
in the present press apparatus 53, another metal different from the mold is used. It is possible to
change to a mold for forming a mold, for example, a semi-dome shaped or dome shaped
magnesium base material.
[0037]
As described above, in the press forming step s1, a predetermined number of cone-shaped
magnesium substrates 55 including the unnecessary portions of the magnesium substrates 55a
are manufactured (see the dashed-dotted line portion M1).
[0038]
Returning to FIG. 1, in the surface treatment step s2, the surface of the cone-shaped magnesium
base 55 molded in the press molding step s1 is surface-treated.
As a result, for example, an oxide film layer is formed on the surface of the cone-shaped
magnesium base material 55 to prevent the occurrence of rust on the easily oxidized magnesium
diaphragm. Specifically, in the surface treatment step s2 of this example, an anodic oxide film
layer is formed on the surface of the cone-shaped magnesium base 55 by, for example, a known
anodic oxidation method, whereby rust occurs on the magnesium diaphragm. To prevent.
[0039]
Here, a method of forming an anodic oxide film on the surface of the cone-shaped magnesium
base 55 will be briefly described. A cone-shaped magnesium diaphragm 55 is used as an anode,
and a current is supplied in a solution of sulfuric acid, oxalic acid, chromic acid or the like. Then,
oxygen is generated on the anode side, and the oxygen forms an anodic oxide film layer on the
surface of the cone-shaped magnesium diaphragm 55. FIG. 3A shows a partially enlarged crosssectional view of a state in which the anodic oxide film layer 55b is formed on the surface of the
cone-shaped magnesium diaphragm 55 by the anodic oxidation method described above. In the
anodic oxidation method, it is possible to form the anodic oxide film layer 55b with a thickness of
several micrometers to several tens of micrometers. In order to further improve the corrosion
resistance of the magnesium diaphragm, the surface of the anodic oxide film layer 55b may be
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electrodeposited.
[0040]
In the trimming step s3, as shown in FIG. 1, the cone-shaped magnesium base 55 surface-treated
in the surface treatment step s2 is trimmed (punched). The trimming process is a cone that is a
molded article from the cone-shaped magnesium base 55 (see the dashed-dotted line part M1 in
FIG. 2) including the unnecessary part of the magnesium base 55a manufactured in the press
forming step s1. It refers to the process of removing the magnesium base 55 of the shape.
Thereby, a cone-shaped magnesium diaphragm is manufactured. FIG. 3B shows a cross-sectional
view of the cone-shaped magnesium diaphragm 3 which has been subjected to the trimming
process through the trimming step s3.
[0041]
As shown in FIG. 3B, cut surfaces 3a and 3d by trimming are formed along the circumferential
direction near the peripheral portions 3b and 3c of the cone-shaped magnesium diaphragm 3,
respectively. Here, FIGS. 3C and 3D show cross-sectional views in which the vicinity of the cut
surfaces 3a and 3d are enlarged. As shown in an enlarged manner in FIGS. 3C and 3D,
magnesium is exposed and many irregularities are formed on the cut surfaces 3a and 3d by the
trimming process, and the surface treatment is not performed.
[0042]
Therefore, in the conventional method of manufacturing a speaker device having a cone-shaped
magnesium diaphragm, as shown in FIG. 1, a cutting surface treatment step s6 is provided
between the trimming step s3 and the edge attaching step s4, and trimming is performed there
For example, an acrylic, polyester, or epoxy-based paint is applied to the cut surfaces 3a and 3d
of the cone-shaped magnesium diaphragm 3 resulting from the treatment to perform an
anticorrosion treatment.
[0043]
However, in the method of manufacturing the speaker device having the cone-shaped magnesium
diaphragm of this example, the cut surfaces 3a and 3d of the cone-shaped magnesium diaphragm
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3 are adhesive with the edge attaching step s4 and the speaker device forming step s5 described
later. Since it coat | covers, the rustproof property of the cut surface 3a, 3d can be improved.
Therefore, in the manufacturing method of this example, it is not necessary to provide the cut
surface treatment step s6 between the trimming step s3 and the edge attaching step s4.
[0044]
In the edge attaching step s4, the peripheral portion 3b of the cone-shaped magnesium
diaphragm 3 and the annular edge are fixed by an adhesive. FIG. 4A shows a cross-sectional view
in which the lower end surface of the peripheral portion 3b of the magnesium diaphragm 3 in a
cone shape and the upper end surface of the inner peripheral portion 10a of the annular edge 10
are fixed by the adhesive P1. . In addition, as an adhesive agent which concerns on a present
Example, adhesive agents, such as chloroprene rubber, butyl type rubber, polyester type, or an
epoxy type, are mentioned.
[0045]
Specifically, in the edge affixing step s4, as shown in FIG. 4A, the cut surface 3a of the coneshaped magnesium diaphragm 3 is completely covered with the adhesive P1 along the
circumferential direction, and the cone The lower end surface of the peripheral portion 3b of the
magnesium diaphragm 3 having the shape is fixed to the upper end surface of the inner
peripheral portion 10a of the annular edge 10 with an adhesive P1. Thereby, the contact
between the cut surface 3a of the cone-shaped magnesium diaphragm 3 and the oxygen in the
air is completely blocked. Thus, the generation of rust on the cut surface 3a can be prevented. In
addition, since the adhesive strength between the cone-shaped magnesium diaphragm 3 and the
annular edge 10 is improved by the above, a high quality cone-shaped magnesium diaphragm 3
is obtained.
[0046]
In the speaker device producing step s5, the cone-shaped magnesium diaphragm 3 to which the
annular edge 10 is fixed in the edge sticking step s4 is attached to the speaker main body,
whereby a speaker device provided with the cone-shaped magnesium diaphragm 3 is
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manufactured. Be done. Here, with reference to FIG.4 and FIG.5, the method the speaker
apparatus provided with the cone-shaped magnesium diaphragm 3 is manufactured by speaker
apparatus preparation process s4 is demonstrated.
[0047]
That is, in the speaker device forming step s5, the outer peripheral edge 10b of the annular edge
10 is fixed to the peripheral edge 2a of the frame 2 of the speaker main body with an adhesive,
and the peripheral edge 3c of the cone-shaped magnesium diaphragm 3 is bonded It is fixed to
the cylindrical voice coil bobbin 5 and the annular damper 4 of the speaker main body by the
agent P2.
[0048]
FIG. 4B shows an enlarged cross-sectional view of the vicinity of the neck portion.
In addition, a neck part means the part which affixes a diaphragm, a voice coil bobbin, and a
damper. In the speaker device producing step s5, first, the peripheral portion 3c of the coneshaped magnesium diaphragm 3 is fitted to the cylindrical voice coil bobbin 5 up to the position
of the neck portion. Subsequently, in the speaker device forming step s5, the cut surface 3d of
the cone-shaped magnesium diaphragm 3 is completely covered with the adhesive P2 along the
circumferential direction, and the peripheral portion 3c of the cone-shaped magnesium
diaphragm 3 The cylindrical voice coil bobbin 5 and the annular damper 4 are fixed by the
adhesive P2. Thereby, the contact between the cut surface 3 d of the cone-shaped magnesium
diaphragm 3 and oxygen in the air is completely blocked. Therefore, it is possible to prevent the
occurrence of rust on the cut surface 3d. In addition, the adhesive strength between the coneshaped magnesium diaphragm 3, the cylindrical voice coil bobbin 5 and the annular damper 4 is
improved by the above, and the high-quality cone-shaped magnesium diaphragm 3 is obtained.
[0049]
Thus, in the speaker device producing step s5, the speaker device 100 including the cone-shaped
magnesium diaphragm 3 is produced. FIG. 5 shows a cross-sectional view of a speaker device
100 provided with the cone-shaped magnesium diaphragm 3. Here, with reference to FIG. 5, the
basic configuration and basic principle of the manufactured speaker device 100 will be briefly
described. The speaker device 100 includes a vibration system such as a frame 2 made of a resin
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plate, a cone-shaped magnesium diaphragm 3, an annular damper 4, a cylindrical voice coil
bobbin 5, and a voice coil 6, a pole piece 7, a plate 8, And a magnetic circuit system including the
magnet 9 and the like. Here, the individual components of the speaker device 100 are known,
and therefore the description thereof is omitted.
[0050]
In the speaker device 100, when a voice current flows through the voice coil 6 in a uniform
magnetic field, an electromagnetic force in the direction of arrow Y5 is generated in the
cylindrical voice coil bobbin 5 by the principle of electromagnetic action. It vibrates in the arrow
Y5 direction. Then, the vibration is transmitted to the cone-shaped magnesium diaphragm 3, and
the speaker device 100 emits a sound wave.
[0051]
As mentioned above, in the manufacturing method of the speaker apparatus 100 provided with
the cone-shaped magnesium diaphragm 3 which concerns on this example, cut surface 3a, 3d of
the cone-shaped magnesium diaphragm 3 is circumferential direction in edge sticking process s4
and speaker apparatus preparation process s5. Are completely covered by the adhesives P1 and
P2. Thereby, generation | occurrence | production of rust can be prevented without giving a
rustproofing to those cut surfaces 3a and 3d, and the rustproofing improvement of those cut
surfaces 3a and 3d can be aimed at. For this reason, according to the manufacturing method of
the present example, the speaker device 100 including the high quality cone-shaped magnesium
diaphragm 3 excellent in rust prevention can be manufactured. Further, in the manufacturing
method of this embodiment, as shown in FIG. 1, since the cut surface processing step s6 is
omitted, the number of man-hours can be reduced, and the manufacturing cost of the speaker
device 100 can be reduced. Can be
[0052]
Second Embodiment FIG. 6 shows a method of manufacturing a speaker device provided with a
dome-shaped or semi-dome shaped magnesium diaphragm. Such a speaker device is
manufactured by a press forming step s11, a surface treatment step s12, a trimming step s13,
and a speaker device forming step s14, as shown in FIG. In the manufacturing method of this
embodiment, the cut surface processing step s15 is not provided between the trimming step s13
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and the speaker device forming step s14 for the same reason as the first embodiment. Also, each
step of this embodiment is substantially the same as that of the first embodiment, and in the
following description, contents different from the first embodiment will be mainly described.
[0053]
In the press forming step s11, the plate-like or sheet-like magnesium base material is pressed by
a pressing apparatus to manufacture a dome-like or semi dome-like magnesium base material.
Unlike the cone-shaped magnesium base 55 according to the first embodiment, the dome-shaped
or semi-dome-shaped magnesium base manufactured here is integrally molded without the edge
and the diaphragm being independent of each other. There is. Therefore, in the manufacturing
method of this embodiment, unlike the manufacturing method of the first embodiment, the edge
pasting step s4 is not provided between the trimming step s13 and the speaker device forming
step s14.
[0054]
In the surface treatment step s12, the surface of the dome-shaped or semi-dome shaped
magnesium base material formed in the press forming step s11 is surface-treated. In the
trimming step s13, the dome-shaped or semi-dome shaped magnesium base material surfacetreated in the surface treatment step s12 is trimmed. Thereby, a dome-shaped or semi-dome
shaped magnesium diaphragm is manufactured. 7A and 7B show cross-sectional views of the
dome-shaped magnesium diaphragm 30 or the semi-dome-shaped magnesium diaphragm 40
that has been subjected to the trimming process through the trimming step s13.
[0055]
Returning to FIG. 6, in the speaker device producing step s14, the dome-shaped magnesium
diaphragm 30 trimmed in the trimming step s13 or the semi-dome shaped magnesium
diaphragm 40 is attached to the speaker main body, or the diaphragm 30 or A speaker device
provided with the diaphragm 40 is manufactured.
[0056]
Specifically, in the speaker device forming step s14, as shown in FIG. 7 and FIG. 8, the cut surface
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30ab near the edge 30a of the dome-shaped magnesium diaphragm 30, or near the edge 40a of
the semi-dome-shaped magnesium diaphragm 40. The cut surface 40ab is completely covered
with the adhesive P3 along the circumferential direction, and the lower end surface of the outer
peripheral edge 30ac or the lower end surface of the outer peripheral edge 40ac and the
peripheral edge 22a of the frame 22 of the speaker body The end face is fixed by the adhesive
P3.
Flatness is secured in the upper end surface of the peripheral portion 22a of the frame 22, the
upper end surface of the outer peripheral portion 30ac of the dome-shaped magnesium
diaphragm 30, and the upper end surface of the outer peripheral portion 40ac of the semi-dome
shaped magnesium diaphragm 40. ing. Thereby, the contact between the cut surface 30ab of the
dome-shaped magnesium diaphragm 30 or the cut surface 40ab of the semi-dome-shaped
magnesium diaphragm 40 and oxygen in the air is completely blocked. Therefore, it can prevent
that rust generate | occur | produces in the cut surface 30ab or 40ab.
[0057]
Thus, in the speaker device producing step s14, the speaker device 200 including the domeshaped magnesium diaphragm 30 or the speaker device 300 including the semi-dome-shaped
magnesium diaphragm 40 is manufactured. A cross-sectional view of the speaker device 200 or
the speaker device 300 is shown in FIG. 9 (a) or (b). Here, with reference to FIG. 9 (a) or (b), the
basic structure and basic principle of the speaker apparatus 200 or 300 manufactured by the
above are demonstrated easily.
[0058]
The speaker device 200 or 300 includes a vibration system such as a dome-shaped magnesium
diaphragm 30 or a semi-dome-shaped magnesium diaphragm 40, a voice coil 21, a frame 22
formed of a resin plate, and a cylindrical voice coil bobbin 20; 23, a magnet 24, and a magnetic
circuit system such as a plate 25. Here, individual components of the above-described speaker
device 200 or 300 are known and will not be described. In the speaker device 200 or 300, when
a voice current flows through the voice coil 21 in a uniform magnetic field, the cylindrical voice
coil bobbin 20 vibrates up and down in the axial direction of the speaker device by the principle
of electromagnetic action. . Then, the vibration is transmitted to the dome-shaped magnesium
diaphragm 30 or the semi-dome-shaped magnesium diaphragm 40, and the sound wave is
emitted from the dome-shaped magnesium diaphragm 30 or the semi-dome-shaped magnesium
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diaphragm 40.
[0059]
As described above, in the method for manufacturing the speaker device 200 including the
dome-shaped magnesium diaphragm 30 according to the present embodiment or the speaker
device 300 including the semi-dome-shaped magnesium diaphragm 40, the dome-shaped
magnesium diaphragm 30 is manufactured in the speaker device preparation step s14. The cut
surface 30ab of or the cut surface 40ab of the semi-dome shaped magnesium diaphragm 40 is
completely covered with the adhesive P3 along the circumferential direction. Thereby, generation
| occurrence | production of rust can be prevented without giving an antirust process to the cut
surface 30ab or the cut surface 40ab, and the rustproof property of the cut surface 30ab or the
cut surface 40ab can be improved.
[0060]
Further, in the manufacturing method of this embodiment, since the cutting surface treatment
process is omitted as in the first embodiment, the number of man-hours can be reduced, and a
speaker device provided with the dome-shaped magnesium diaphragm 30 The manufacturing
cost of the speaker device 300 including the 200 or the semi-dome shaped magnesium
diaphragm 40 can be reduced.
[0061]
Third Embodiment In the present embodiment, the dome-shaped magnesium diaphragm 30 or
the semi-dome-shaped magnesium diaphragm 40 trimmed in the trimming step s13 in the
speaker device producing step s14 shown in FIG. The second embodiment differs from the
second embodiment in that it is fixed to the packing of the speaker body with an adhesive.
Accordingly, except for this point, the second embodiment is substantially the same as the second
embodiment, and in the following description, a speaker device provided with the dome-shaped
magnesium diaphragm 30 or a speaker provided with the semi-dome-shaped magnesium
diaphragm 40 Describe how to make the device.
[0062]
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Specifically, in the speaker device producing step s14, as shown in FIGS. 10A and 10B, first, the
upper end surface of the peripheral portion 22a of the frame 22 and the lower end surface of the
annular packing G1 are adhesively bonded. It is fixed. Subsequently, in the speaker device
producing step s14, the upper end surface of the annular packing G1, the lower end surface of
the outer peripheral edge 30ac of the dome-shaped magnesium diaphragm 30, or the outer
peripheral edge 40ac of the semi-dome shaped magnesium diaphragm 40 The lower end surface
is fixed by the adhesive P4. At this time, in the speaker device forming step s14, the cut surface
30ab of the dome-shaped magnesium diaphragm 30 or the cut surface 40ab of the semi-domeshaped magnesium diaphragm 40 is completely covered with the adhesive P4 along the
circumferential direction. Ru. Subsequently, in the speaker device forming step s14, the upper
end surface of the outer peripheral edge portion 30ac of the dome shaped magnesium
diaphragm 30 fixed to the packing G1 with the adhesive P4 or the outer peripheral edge portion
40ac of the semi dome shaped magnesium diaphragm 40 The upper end surface and the lower
end surface of the packing G2 are fixed by an adhesive P4. Thereby, the contact between the cut
surface 30ab or the cut surface 40ab and oxygen in the air is completely cut off. Therefore,
generation | occurrence | production of rust can be prevented without giving an antirust process
to the cut surface 30ab or the cut surface 40ab, and the rustproof property of the cut surface
30ab or the cut surface 40ab can be improved.
[0063]
10 (a) or 10 (b) shows a cross-sectional view of the dome-shaped magnesium diaphragm 30 or
the semi-dome-shaped magnesium diaphragm 40 fixed to the packings G1 and G2 by the
adhesive P4. The upper end face and the lower end face of the outer peripheral edge 30ac of the
dome-shaped magnesium diaphragm 30, or the upper end face and the lower end face of the
outer peripheral edge 40ac of the semi-dome shaped magnesium diaphragm 40, the upper end
face of the peripheral edge 22a of the frame 22 The upper end surface and the lower end surface
of the packing G1 and the lower end surface of the packing G2 have flatness.
[0064]
Thus, the speaker device 400 including the dome-shaped magnesium diaphragm 30 or the
speaker device 500 including the semi-dome-shaped magnesium diaphragm 40 is manufactured.
The cross-sectional view of the speaker device 400 or the speaker device 500 is shown in FIG.
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19
[0065]
As described above, in the method of manufacturing the speaker device 400 including the domeshaped magnesium diaphragm 30 according to the present embodiment or the speaker device
500 including the semi-dome-shaped magnesium diaphragm 40, the dome-shaped magnesium
diaphragm 30 is manufactured in the speaker device preparation step s14. The cut surface 30ab
of or the cut surface 40ab of the semi-dome shaped magnesium diaphragm 40 is completely
covered with the adhesive P4 along the circumferential direction. Thereby, generation |
occurrence | production of rust can be prevented without giving an antirust process to the cut
surface 30ab or the cut surface 40ab, and the rustproof property of the cut surface 30ab or the
cut surface 40ab can be improved. Further, in the manufacturing method of this embodiment,
since the cutting surface treatment step is omitted as in the first and second embodiments, the
number of man-hours can be reduced, and the dome-shaped magnesium diaphragm 30 can be
manufactured. It is possible to reduce the manufacturing cost of the provided speaker device 400
or the speaker device 500 provided with the semi-dome shaped magnesium diaphragm 40.
[0066]
Fourth Embodiment In this embodiment, a recess is formed along the circumferential direction
on the upper end surface of the peripheral portion of the frame in which flatness is ensured in
the speaker device producing step s14 shown in FIG. 6, and a dome shape is formed in the recess
Alternatively, the bent and formed outer peripheral edge of the semi-dome shaped magnesium
diaphragm is fitted, and the bent and formed outer peripheral edge of the magnesium vibrating
plate is fixed by an adhesive in the recess. The present embodiment is different from the second
embodiment in this point. Therefore, in the following description, a method of manufacturing a
speaker device provided with a dome-shaped or semi-dome shaped magnesium diaphragm will
be described centering on such a point.
[0067]
First, in the press forming step s11 shown in FIG. 6, a recess formed along the circumferential
direction on the upper end surface of the peripheral portion of the frame and the outer
peripheral portion of the dome-shaped or semi-dome shaped magnesium diaphragm are fitted
The outer peripheral edge is bent to form a dome shaped or semi dome shaped magnesium base.
Next, in the surface treatment step s12 shown in FIG. 6, the surface of the dome-shaped or semi-
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20
dome shaped magnesium base material is surface-treated, and subsequently in the trimming step
s13 shown in FIG. The shaped magnesium substrate is trimmed.
[0068]
Thus, the dome-shaped magnesium diaphragm 30 'or the semi-dome-shaped magnesium
diaphragm 40' is manufactured. 12 (a) or 12 (b) shows a cross-sectional view of the domeshaped magnesium diaphragm 30 'or the semi-dome-shaped magnesium diaphragm 40'. That is,
the shape of the outer peripheral edge 30'ac of the dome-shaped magnesium diaphragm 30
'according to the present embodiment, or the shape of the outer peripheral rim 40'ac of the semidome-shaped magnesium diaphragm 40' is shown in FIG. As shown in), it is formed by bending
(see the broken line portion).
[0069]
On the other hand, on the upper end surface of the peripheral portion 22a of the frame 22 of the
speaker main body, as shown in FIG. 13A or 13B, a recess 22b is formed along the
circumferential direction.
[0070]
Next, with reference to FIG. 13 (a) or (b), the speaker device creation step s14 will be described.
In the speaker device producing step s14 shown in FIG. 6, the outer peripheral edge 30'ac of the
dome-shaped magnesium diaphragm 30 'which has been trimmed first, or the outer peripheral
edge 40'ac of the semi-dome-shaped magnesium diaphragm 40' Is fitted into the recess 22b
formed in the peripheral portion 22a of the The adhesive P6 is applied to the lower end surface
of the outer peripheral portion 30'ac, the lower end surface of the outer peripheral portion 40'ac,
and / or the end surface in the recess. At this time, the cut surface 30'ab or the cut surface 40'ab
is completely covered with the adhesive P6 along the circumferential direction.
[0071]
Thus, the dome-shaped magnesium diaphragm 30 'or the semi-dome-shaped magnesium
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diaphragm 40' can be accurately positioned with respect to the frame of the speaker main body,
and the dome-shaped magnesium diaphragm 30 'or the semi-dome The magnesium diaphragm
40 'and the frame 22 are firmly bonded. Further, the contact between the cut surface 30'ab of
the dome-shaped magnesium diaphragm 30 'or the cut surface 40'ab of the semi-dome-shaped
magnesium diaphragm 40' and oxygen in the air is completely blocked. Therefore, the
occurrence of rust can be prevented without applying the anticorrosion treatment to the cut
surface 30'ab or the cut surface 40'ab, and the rustproof property of the cut surface 30'ab or the
cut surface 40'ab can be improved. it can.
[0072]
Thus, the speaker device 600 including the dome-shaped magnesium diaphragm 30 ′ or the
speaker device 700 including the semi-dome-shaped magnesium diaphragm 40 ′ is
manufactured. 14A and 14B show cross-sectional views of the speaker device 600 or the speaker
device 700. FIG.
[0073]
As described above, in the speaker device 600 including the dome-shaped magnesium diaphragm
30 ′ according to the present embodiment or the method of manufacturing the speaker device
700 including the semi-dome-shaped magnesium diaphragm 40 ′, the dome-shaped magnesium
vibration is performed in the speaker device creation step s14 The cut surface 30'ab of the plate
30 'or the cut surface 40'ab of the semi-dome shaped magnesium diaphragm 40' is completely
covered with the adhesive P6 along the circumferential direction. As a result, the occurrence of
rust can be prevented without applying an anticorrosion treatment to the cut surface 30'ab or
the cut surface 40'ab, and the corrosion resistance of the cut surface 30'ab or the cut surface
40'ab can be improved Can. Further, in the manufacturing method of this embodiment, as in the
first, second, and third embodiments, the cutting surface treatment step is omitted, so that the
number of man-hours can be reduced, and dome-shaped magnesium is obtained. It is possible to
reduce the manufacturing cost of the speaker device 600 including the diaphragm 30 ′ or the
speaker device 700 including the semi-dome shaped magnesium diaphragm 40 ′.
[0074]
As described above, according to the speaker device including the magnesium diaphragm
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according to the present invention and the manufacturing method thereof, the cut surface of the
trimmed magnesium diaphragm is completely covered with the adhesive, so the cut surface It is
possible to prevent the occurrence of rust without applying an anticorrosion treatment. Thereby,
the antirust property of the cut surface can be improved. Therefore, the speaker apparatus
provided with the high quality magnesium diaphragm excellent in rustproofing can be
manufactured. Further, in the present manufacturing method, since the anticorrosion treatment
step is omitted in the subsequent step of the trimming step, the number of man-hours can be
reduced, and the manufacturing cost of the speaker device can be reduced.
[0075]
7 illustrates a method of manufacturing a speaker device including a cone-shaped magnesium
diaphragm. An aspect which shape | molds the cone-shaped magnesium base material by a press
molding process is shown. The cross section diagram of the cone shaped magnesium diaphragm
after surface treatment and trimming processing is shown. The cross section of the state where
the cut section of the trimmed cone-shaped magnesium diaphragm is covered with the adhesive
is shown. The sectional view of the speaker device provided with the cone shaped magnesium
diaphragm manufactured by the manufacturing method of the 1st example is shown. 7 illustrates
a method of manufacturing a speaker device including a dome-shaped or semi-dome shaped
magnesium diaphragm. The cross section of the dome shaped or semi dome shaped magnesium
diaphragm manufactured by the manufacturing method of the 2nd example is shown. FIG. 6
shows a cross-sectional view of a trimmed dome-shaped or semi-dome shaped magnesium
diaphragm cut surface coated with an adhesive on a frame. The sectional view of the speaker
device provided with the dome shaped or semi dome shaped magnesium diaphragm
manufactured by the manufacturing method of the 2nd example is shown. The cross section of
the state where the cut section of the trimmed dome shaped or semi dome shaped magnesium
diaphragm is covered with the adhesive between the packings. FIG. 10 shows a cross-sectional
view of a speaker device provided with a dome-shaped or semi-dome shaped magnesium
diaphragm manufactured by the manufacturing method of the third embodiment. The cross
section of the dome shaped or semi dome shaped magnesium diaphragm manufactured by the
manufacturing method of the 4th example is shown. FIG. 6 shows a cross-sectional view of a
trimmed dome-shaped or semi-dome shaped magnesium diaphragm cut surface coated with
adhesive in a recess of a frame. The sectional view of the speaker device provided with the dome
shaped or semi dome shaped magnesium diaphragm manufactured by the manufacturing
method of the 4th example is shown.
Explanation of sign
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[0076]
2, 22 frame 3, 30, 30 ', 40, 40' magnesium diaphragm 4 damper 5, 20 voice coil bobbin 6, 21
voice coil 7 pole piece 8, 25 plate 9, 24 magnet 10, 30a, 30'a, 40a, 40'a edge 23 pot yoke 100,
200, 300, 400, 500, 600, 700 Speaker device
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