JP2003153386

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DESCRIPTION JP2003153386
[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 FIG.
FIG. 3 shows a cross-sectional view of a conventional speaker, in which an inner magnet type
magnetic circuit 4 is configured by sandwiching a magnetized magnet 1 by an upper plate 2 and
a yoke 3. The frame 6 is coupled to the yoke 3 of the magnetic circuit 4. A diaphragm 7 is
adhered to the periphery of the frame 6 with an adhesive, and a voice coil 8 adhesively bonded
to the diaphragm 7 is bonded to the magnetic gap 5 of the magnetic circuit 4.
[0003]
The above-mentioned speaker has the diaphragm 7 and the voice coil 8 and the frame 6 and the
diaphragm 7 adhesively bonded to each other by an adhesive, so that the weight of the adhesive
reduces the sound pressure level. It was an issue to invite.
[0004]
The present invention solves the above-mentioned subject, and provides an excellent speaker
which can realize improvement in sound pressure level.
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[0005]
In order to solve the above problems, the present invention has the following constitution.
[0006]
In the invention according to claim 1 of the present invention, the frame and the voice coil are
integrated by the structure of the diaphragm.
With this configuration, since the adhesive becomes unnecessary, the weight of the vibration
system can be reduced and quantified, and the effect of improving the sound pressure level and
stabilizing the characteristics can be obtained.
[0007]
According to a second aspect of the present invention, the diaphragm is composed of a microfiller-kneaded thermoplastic elastomer of submicron diameter mainly composed of ethylene
propylene diene terpolymer (EPDM).
With this configuration, the elastic strength of the diaphragm is improved, and an effect of
preventing deformation of the diaphragm due to wind pressure, drop impact, heat, and the like
can be obtained.
[0008]
According to a third aspect of the present invention, the diaphragm is composed of micro-fillerkneaded rubber of submicron diameter mainly composed of ethylene propylene diene terpolymer
(EPDM).
With this configuration, the rubber elastic strength of the diaphragm is improved, and the
diaphragm capable of preventing deformation of the diaphragm due to wind pressure, drop
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impact, heat and the like and stabilizing characteristics by improvement of internal loss is inmold vulcanization by inexpensive heat press. This can be realized by a molding method, and has
the effect of being able to reduce equipment costs and production costs.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. The same contents will be described in a
simplified manner.
[0010]
(First Embodiment) The invention according to the first aspect of the present invention will be
described with reference to the first embodiment.
[0011]
FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention,
and FIG. 2 is a cross-sectional view of an essential part of a component according to an
embodiment of the present invention. The magnet 21 thus formed is sandwiched between the
upper plate 22 and the yoke 23 to constitute an inner magnetic type magnetic circuit 24.
On the other hand, as shown in FIG. 2, the frame 26 and the voice coil 28 are integrated by the
resin of the insert-molded diaphragm 27 to constitute a vibration system.
[0012]
The frame 26 having the configuration of FIG. 2 is coupled to the yoke 23 of the magnetic circuit
24 shown in FIG. 1 so that the voice coil 28 is fitted into the magnetic gap 25 of the magnetic
circuit 24.
[0013]
With this configuration, the adhesive of the frame 26 and the diaphragm 27 and the diaphragm
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27 and the voice coil 28 becomes unnecessary, so that the weight reduction and quantification of
the vibration system can be achieved, and the sound pressure level can be improved.
Furthermore, the characteristics can be stabilized by eliminating the variation in adhesive weight.
Further, since the bonding process of the frame 26 and the diaphragm 27 and the bonding
process of the diaphragm 27 and the voice coil 28 can be reduced, a great cost reduction can be
achieved in the production process.
[0014]
Second Embodiment The second embodiment of the present invention will be described below
with reference to the second aspect of the present invention. A difference from Embodiment 1 is
that the resin material of the diaphragm 27 is composed of a micro-filler-kneaded thermoplastic
elastomer of submicron diameter mainly composed of ethylene propylene diene terpolymer
(EPDM). By this configuration, the elastic strength of the diaphragm 27 is improved, and even if
the diaphragm 27 is temporarily or instantaneously deformed due to wind pressure, dropping
impact, heat, etc., the elastic strength is improved, so that You can return to the shape of.
[0015]
Further, by improving the internal loss of the diaphragm 27, it is possible to suppress peaks and
dips in the frequency characteristics of the speaker and obtain stable frequency characteristics.
Moreover, reduction of distortion can also be achieved by this.
[0016]
Third Preferred Embodiment The third preferred embodiment according to the present invention
will be described below with reference to the third preferred embodiment. A different point from
the first embodiment is that the resin material of the diaphragm 27 is composed of micro-fillerkneaded rubber of submicron diameter mainly made of ethylene propylene diene terpolymer
(EPDM). With this configuration, the diaphragm 27 can be produced by the in-mold vulcanization
molding method using an inexpensive heat press, and the equipment cost and the production
cost can be significantly reduced. In addition, the diaphragm 27 has improved rubber elastic
strength, and even if the diaphragm 27 is temporarily or instantaneously deformed due to wind
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pressure, dropping impact, heat, etc., the rubber elastic strength is improved, so that You can
return to the shape of.
[0017]
Furthermore, since the internal loss of the diaphragm 27 is rubber, it can be dramatically
improved, and a flexible motion can be obtained. Therefore, the peak and the dip are largely
suppressed in the frequency characteristic of the speaker, and a stable frequency characteristic
can be obtained. Moreover, reduction of distortion can also be achieved significantly by this.
[0018]
As described above, in the loudspeaker according to the present invention, the frame and the
voice coil are integrated by the construction of the diaphragm to constitute a vibration system.
With this configuration, since the adhesive is not necessary, the weight of the vibration system
can be reduced and quantified, and the sound pressure level can be improved and the
characteristics can be stabilized.
[0019]
Thus, the present invention can provide an excellent speaker capable of realizing improvement in
sound pressure level and stabilization of characteristics, and its industrial value is extremely
large.
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