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JP2003179993

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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 JP2003179993
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio devices and information communication devices.
[0002]
2. Description of the Related Art A conventional speaker will be described with reference to FIGS.
2 and 5. FIG. FIG. 2 shows a cross-sectional view of a conventional speaker, and FIG. 5 shows its
sound pressure frequency characteristics.
[0003]
As shown in FIG. 2, the magnetized magnet 1 is sandwiched between the upper plate 2 and the
yoke 3 to constitute an internal magnetic circuit 4. The frame 6 is coupled to the yoke 3 of the
magnetic circuit 4. A diaphragm 7 is bonded to the peripheral portion of the frame 6, and a voice
coil 8 coupled to the diaphragm 7 is coupled so as to fit in the magnetic gap 5 of the magnetic
circuit 4. Then, on the front surface of the diaphragm 7, a protector 9 for preventing deformation
of the diaphragm 7 and a protective film film 10 are connected to the peripheral portion of the
frame 6. At this time, the material of the diaphragm 7 is made of a hard film such as polyethylene
naphthalate or polyethylene terephthalate.
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1
[0004]
FIG. 5 shows the sound pressure frequency characteristics of the above-mentioned conventional
speaker, which is a characteristic in the presence of the protector 9 for preventing deformation
and the protective film 10 on the front surface of the diaphragm 7 of the speaker.
[0005]
The above-mentioned speaker is provided with a protector 9 and a protective film 10 in order to
improve the waterproofness and wind pressure resistance and other reliability of the mobile
phone used as the device.
For this reason, it has been a problem that these become obstacles to air permeability and cause
a decrease in sound pressure level in the range of 1000 to 20000 Hz as shown in FIG.
[0006]
The present invention is to solve the above-mentioned problems, and to provide an excellent
speaker capable of realizing improvement in sound pressure level while maintaining
waterproofness and wind pressure resistance.
[0007]
In order to solve the above problems, the present invention has the following constitution.
[0008]
The invention according to claim 1 of the present invention is one in which the diaphragm is
composed of a thermoplastic elastomer having polybutylene naphthalate (PBN) as a hard
segment.
[0009]
With this configuration, the rubber elastic strength of the diaphragm is improved, so that
reliability performance such as waterproofness and wind pressure resistance can be ensured, and
an effect of eliminating the protector and the protective film and improving the sound pressure
level can be obtained. .
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2
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0011]
(First Embodiment) The invention according to the first aspect of the present invention will be
described with reference to the first embodiment.
[0012]
FIG. 1 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention, and FIG. 3 shows its sound pressure frequency characteristics, and FIG. 4 shows one
example of the viscoelastic characteristics of its diaphragm substrate. .
[0013]
As shown in FIG. 1, the magnetized magnet 21 is sandwiched between the upper plate 22 and the
yoke 23 to form an internal magnetic circuit 24.
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24.
A diaphragm 27 is bonded to the peripheral portion of the frame 26, and a voice coil 28 coupled
to the diaphragm 27 is coupled so as to fit in the magnetic gap 25 of the magnetic circuit 24.
[0014]
At this time, the diaphragm 27 is made of a thermoplastic elastomer having polybutylene
naphthalate (PBN) as a hard segment.
[0015]
With this configuration, the rubber elastic strength of the diaphragm 27 is improved, so that
even if a force is applied to the diaphragm 27 by water pressure or wind pressure and the
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3
diaphragm 27 is temporarily deformed, the strong rubber elastic strength of the diaphragm 27
immediately brings about a state You can go back.
Therefore, even without the protector and the protective film, reliability performance such as
waterproofness and wind pressure resistance can be secured.
Therefore, the sound pressure level can be improved by eliminating one or both of the protector
and the protective film that are obstacles to air permeability.
In addition, it is possible to reduce the cost of parts of protectors and protective films and the
cost of manufacturing them.
[0016]
FIG. 3 shows the sound pressure frequency characteristics of the speaker according to the
present invention, and since the protector and the protective film are not provided on the front of
the diaphragm 27 of the speaker, the air permeability is improved and compared to the
conventional example of FIG. It shows that sound pressure level improvement can be realized in
the range of 1000 to 20000 Hz.
[0017]
FIG. 4 shows an example of the visco-elastic property of the base material of the diaphragm 27.
The polybutylene naphthalate (PBN) film base material has stable properties against a wide
atmospheric temperature both in Young's modulus and loss. In other words, it shows that it has
stable visco-elastic properties.
[0018]
Table 1 shows an example of the characteristics of the base material of the diaphragm 27. The
polybutylene naphthalate (PBN) film base material which is a thermoplastic elastomer is a
conventional thermoplastic elastomer, an engineering plastic, and a general vulcanized rubber. It
shows that it is superior in terms of flexibility, heat resistance and dimensional stability as
compared with.
[0020]
In addition to the above-mentioned features, it is excellent in cold resistance, impact resistance,
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4
soundproofness, chemical resistance, oil resistance, ozone resistance and molding processability,
as compared with conventional thermoplastic elastomers. It is excellent also in processability etc.,
and various application development is possible using this feature.
[0021]
As described above, in the loudspeaker according to the present invention, the diaphragm is
composed of a thermoplastic elastomer having polybutylene naphthalate (PBN) as a hard
segment.
[0022]
With this configuration, the rubber elastic strength of the diaphragm is improved, so that
reliability performance such as waterproofness and wind pressure resistance can be secured, and
a protector and a protective film can be eliminated to improve the sound pressure level.
[0023]
As described above, the present invention can provide an excellent speaker capable of realizing
improvement in sound pressure level and cost reduction while securing the reliability
performance of the speaker, and its industrial value is extremely large.
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