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JP2003264890

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2003264890
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm for use in various audio devices, communication devices and the like, and a
method of manufacturing the same.
[0002]
2. Description of the Related Art The prior art will be described with reference to FIGS. FIG. 6 is a
cross-sectional view of the speaker, and FIG. 7 is a cross-sectional view showing a manufacturing
process of the speaker diaphragm.
[0003]
A magnet 11 and a plate 12 are respectively provided at the center of the bottom of a yoke 10
made of a magnetic material, and the frame 13 is formed by integrally molding the yoke 10 with
a resin. The speaker diaphragm 14 is made of thermoplastic resin such as polyether nitrile,
polyethylene terephthalate, polyether imide, etc. The outer periphery holding ring 15 is around
the diaphragm 14, and the upper end of the voice coil 16 is on the back of the diaphragm 14. Are
adhesively bonded to each other. The voice coil 16 is fitted in the magnetic gap between the plate
12 and the yoke 10. And the protector 17 which has a small hole is provided so that this
diaphragm 14 may be covered.
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1
[0004]
As a method of manufacturing the diaphragm 14 for the speaker, first, the sheet (not shown) of
the above-mentioned thermoplastic resin is heat and pressure molded using male and female
molds 21 and 22 shown in FIG. Then, the voice coil 16 and the outer peripheral holding ring 15
are adhesively bonded to form a vibration system unit, and then the magnetic circuit formed by
the plate 12, the yoke 10 and the magnet 11 is integrated. The speaker is manufactured by
adhesively bonding to the frame 13.
[0005]
According to this manufacturing method, the force for stretching the thermoplastic resin is easily
applied to the diaphragm center portion 18 and the diaphragm bonding portion 19 when
forming the diaphragm 14 for a speaker. The thickness of the diaphragm at the site becomes
thinner.
In particular, when the thickness of the diaphragm bonding portion 19 requiring rigidity is thin,
the bonding strength with the voice coil is lowered, and as a result, there is a problem that the
voice coil is easily peeled off.
[0006]
Therefore, an object of the present invention is to provide a speaker diaphragm in which a voice
coil is not easily peeled off.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to
claim 1 of the present invention is particularly characterized in that the diaphragm thickness of
the annular concave fitting portion is thicker than the diaphragm thickness of the outer
peripheral portion. A diaphragm for a speaker, characterized in that the bonding strength with
the voice coil can be improved by increasing the thickness of the diaphragm of the annular
concave fitting portion for bonding the voice coil, and as a result, the voice coil is peeled off. The
effect is that it becomes difficult.
[0008]
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2
The invention according to claim 2 is characterized in that the resin-made diaphragm formed by
electrodeposition, the voice coil provided in the annular concave fitting portion on the back
surface of the diaphragm, and the outer periphery provided on the outer peripheral portion of
the diaphragm. A diaphragm for a speaker comprising a retaining ring, a coating film provided by
electrodeposition to cover at least the voice coil and the lead wire, and electrodeposition to cover
at least the voice coil and the lead wire By providing the covering film, the bonding strength with
the voice coil can be improved, and as a result, the voice coil is less likely to be peeled off.
[0009]
In addition, by providing a coating film on the lead wire, an operation and an effect that
generation of abnormal noise and disconnection can be suppressed can be achieved.
[0010]
The invention according to claim 3 is the speaker diaphragm according to claim 2, in which the
resin material of the diaphragm and the material of the covering film are different, and in
addition to the same function as in claim 2, different materials are used. By appropriately
selecting the range and the thickness by superimposing, it is possible to achieve an operation and
effect that it becomes easy to arbitrarily set the characteristics such as the rigidity and the
internal loss of the speaker diaphragm.
[0011]
The invention according to claim 4 is a release agent forming step of forming a release agent
layer on the surface of a conductive metal mold, and an electrodeposition step of forming an
electrodeposited resin film on the surface of the release agent layer by electrodeposition. And a
method of manufacturing a speaker diaphragm having a peeling step of peeling the
electrodeposited resin film, and in particular, the electrodeposited resin film is formed on the
surface of the release agent layer by electrodeposition using a conductive metal mold. It is
possible to obtain a speaker diaphragm of a desired thickness by controlling the current density
flowing to the metal type in relation to the counter electrode by forming the diaphragm.
[0012]
In particular, the bonding strength with the voice coil can be improved by increasing the
thickness of the diaphragm of the annular concave fitting portion bonding the voice coil.
[0013]
The invention according to claim 5 has a bonding step of bonding the outer periphery holding
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3
ring to the outer peripheral portion of the diaphragm and the voice coil to the annular concave
fitting portion of the diaphragm in the primary treatment after the electrodeposition step. It is a
manufacturing method of a speaker diaphragm as described in, and has an effect | action similar
to Claim 4.
[0014]
The invention according to claim 6 is such that the shape of the counter electrode used in the
electrodeposition step is such that the film thickness of the electrodeposition resin film of at least
the portion to which the voice coil is joined is thicker than other portions. It is a manufacturing
method of the diaphragm for speakers of claim 4 or claim 5, and by using the counter electrode
of the above-mentioned shape, the thickness of the diaphragm of the annular concave fitting
portion to which the voice coil is joined can be thickened. As a result, it is possible to improve the
bonding strength with the voice coil.
[0015]
The invention according to claim 7 is a method for manufacturing a speaker diaphragm
according to claim 5, further comprising a re-electrodeposition step of forming an
electrodeposition coating film on the surface of the electrodeposition resin film after the
adhesion step. In particular, by providing the coating film so as to cover the voice coil and the
lead wire, the bonding strength with the voice coil can be improved, and as a result, the voice coil
is less likely to be peeled off. is there.
[0016]
In addition, by providing the coating film on the lead wire, the lead wire is fixed to the
electrodeposited resin film, and as a result, generation of abnormal noise and disconnection can
be suppressed.
[0017]
The invention according to claim 8 is the method for producing a speaker diaphragm according
to claim 7, wherein the resin used in the re-electrodeposition step is different from the resin used
in the electrodeposition step, and superimposing is performed using different materials.
Accordingly, by appropriately selecting the range and the thickness thereof, it is possible to
easily produce a speaker diaphragm having different characteristics such as rigidity and internal
loss.
[0018]
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4
BEST MODE FOR CARRYING OUT THE INVENTION A loudspeaker diaphragm of the present
invention and a method of manufacturing the same will be described below with reference to an
embodiment and the drawings.
The same parts as those in the prior art are indicated by the same reference numerals and the
description thereof is omitted.
[0019]
(Embodiment 1) The invention according to claim 1 and claims 4 to 6 will be described using
Embodiment 1 of the present invention and FIGS. 1 to 4.
[0020]
FIG. 1 is a cross-sectional view of the speaker diaphragm in accordance with the first exemplary
embodiment of the present invention.
[0021]
The speaker diaphragm 4 is made of an epoxy resin or the like formed by electrodeposition, and
the voice coil 16 is provided on the annular concave fitting portion 4a of the diaphragm 4 and
the outer peripheral holding ring 15 is provided on the outer peripheral portion 4c. There is.
The thickness of the diaphragm 4 of the annular recessed portion 4a is larger than that of the
other portions, thereby enhancing the bonding strength with the voice coil 16.
The lead wire 16 a of the voice coil 16 is led to an external terminal (not shown) via the outer
peripheral holding ring 15.
[0022]
As a method of manufacturing the diaphragm 4, first, as shown in FIG. 2, a release agent is
applied to the lower surface of the electrodeposition metal mold 6 to form a release agent layer
5.
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5
[0023]
Next, in FIG. 3, the electrodeposition resin film 4 is formed by electrodeposition using this metal
mold 6 for electrodeposition.
The lower surface of the electrodeposition metal mold 6 has a formed shape of the diaphragm 4,
and the counter electrode 7 (cathode) is disposed at the opposite position.
Here, in order to make the annular concave fitting portion 4a thicker than the other portions of
the diaphragm 4, the structure of the electrodeposition metal mold 6 and the counter electrode 7
is as follows.
[0024]
That is, the gap (FIG. 3D) between the metal mold 6 for electrodeposition and the counter
electrode 7 forming the annular recessed fitting portion 4a of the diaphragm 4 is made narrower
than the other gaps.
By doing so, the current easily flows to the annular concave fitting portion 4a, and as a result, the
annular concave fitting portion 4a can be formed thick.
[0025]
Thereafter, the electrodeposited resin film 4 is peeled off to obtain the diaphragm 4.
[0026]
Further, after the electrodeposition is performed, the outer periphery holding ring 15 and the
voice coil 16 may be adhered to the electrodeposition resin film 4.
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6
In that case, do as follows.
[0027]
That is, a primer treatment is performed to modify the portion of the electrodeposited resin film
4 to which the outer peripheral holding ring 15 and the voice coil 16 are adhered, and then the
outer peripheral holding ring 15 and the voice coil 16 are pressed as shown in FIG. Then, the
diaphragm 4 can be obtained by adhering it and then peeling it off.
The outer peripheral retaining ring 15 also serves as a reference for positioning when the voice
coil 16 is fitted into the magnetic gap of the magnetic circuit, and is joined before the speaker
diaphragm 4 is peeled off, so the positioning accuracy is extremely high. It is something that can
be done.
[0028]
According to the above manufacturing method, it is possible to provide a speaker diaphragm in
which the voice coil is not easily peeled off.
[0029]
Second Embodiment The second, third, seventh, and eighth inventions will be described with
reference to a second embodiment of the present invention and FIG.
[0030]
The second embodiment is different from the first embodiment in that the coating film 8 is
provided by electrodeposition so as to cover at least the voice coil 16 and the lead wire 16a as
shown in FIG. The bonding strength between the voice coil 16 and the electrodeposited resin film
4 is improved.
In addition, by providing the coating film 8 on the lead wire 16a, the lead wire 16a is fixed to the
electrodeposited resin film 4, and as a result, it is possible to suppress the occurrence of
abnormal noise and disconnection. It is a thing.
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7
[0031]
As this manufacturing method, for example, as shown in Embodiment 1, there is a method of
forming the covering film 8 by electrodeposition after adhering the outer periphery holding ring
15 and the voice coil 16 to the electrodeposition resin film 4.
[0032]
Here, as the material of the covering film 8, the same material as the electrodeposition resin film
4, for example, an epoxy resin may be used, or a different material, for example, a urethane resin
may be used.
When different materials are used, it is possible to obtain the speaker diaphragm 4 having
different characteristics such as rigidity and internal loss by appropriately selecting the
overlapping range and thickness.
[0033]
The speaker diaphragm can be provided by the same method as Embodiment 1 except for the
above manufacturing method, materials, and the like.
[0034]
As described above, the present invention particularly relates to a speaker diaphragm
characterized in that the diaphragm thickness of the annular recessed portion is larger than the
diaphragm thickness of the outer peripheral portion, and the voice coil is joined. By increasing
the thickness of the diaphragm of the annular recessed portion, the bonding strength with the
voice coil can be improved, and as a result, the voice coil is less likely to be peeled off.
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