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JPH04340899

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DESCRIPTION JPH04340899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm in an electroacoustic transducer and a method of manufacturing the same.
[0002]
2. Description of the Related Art As is well known, a speaker diaphragm has a low density to
increase the output level of the speaker and high elasticity, and also has high elasticity to widen
the reproduction band of the speaker. It is required that a certain internal loss is large in order to
reduce distortion due to divided vibration of the diaphragm.
[0003]
Also, in order to increase the conversion efficiency, a voice coil bobbin is required to be light in
weight, thin, and high in rigidity, and also to be excellent in heat resistance because it is not
deformed by Joule heat of current flowing in the coil. Ru.
[0004]
The conventional speaker diaphragm is made of a single piece of a high elastic body made of
glass fiber, carbon fiber or the like, or a mixture of different high elastic bodies made of a woven
fabric, a non-woven fabric or the like bonded with a resin.
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Then, a voice coil bobbin made of paper, metal such as aluminum, resin, or woven fabric made of
high elastic fiber is adhered to the diaphragm.
In addition, there is also one in which the diaphragm and the voice coil bobbin are integrally
formed of resin by injection molding.
[0005]
SUMMARY OF THE INVENTION In the conventional speaker diaphragm having such a structure,
the diaphragm using glass fiber or carbon fiber is high in elasticity but small in internal loss.
Also, among voice coil bobbins, those using paper are inferior in rigidity and heat resistance,
those using woven fabric made of metal such as aluminum or high elastic fiber are heavy, those
using resin are heat resistance etc. Many are inferior to And since the above-mentioned
diaphragm and the above-mentioned voice coil bobbin are different materials, their attachment is
performed via adhesives, but for this reason, the weight of a diaphragm increases with adhesives
and it vibrates from a voice coil There is a disadvantage that the transfer to the plate results in a
transfer loss at the part of the adhesive. Further, in the case where the diaphragm and the voice
coil bobbin are integrally formed of resin by injection molding, the elasticity of the diaphragm is
low, so a filler of about 20 to 30% by weight to increase the elasticity. It has been
disadvantageous that the weight of the diaphragm is increased.
[0006]
Therefore, the present invention overcomes the disadvantages of the prior art and increases the
weight of the high elasticity, diaphragm having a suitable internal loss, and the voice coil bobbin
having high rigidity, excellent heat resistance and light weight. It is an object of the present
invention to provide a speaker diaphragm that can be mounted without any reduction in
transmission loss between the diaphragm and the voice coil and a method of manufacturing the
same.
[0007]
A speaker diaphragm according to the present invention for achieving the above object
comprises a polyimide fiber and a carbon fiber having a tensile strength of 300 kg / mm 2 or
more and a tensile elastic modulus of 14000 kg / mm 2 or more. A diaphragm 1 made of a
woven fabric, the woven fabric and a thermoplastic resin or thermosetting resin for bonding the
woven fabric, and a voice coil bobbin 3 formed of a polyimide film on the diaphragm 1 Are
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thermally fused and integrated.
[0008]
Further, according to the method of manufacturing the speaker diaphragm, after the voice coil
bobbin 3 is inserted into the diaphragm molding die 5, the resin and the voice coil bobbin for
bonding the woven fabric at the same time when the diaphragm 1 is molded. And heat-sealing to
integrate them.
[0009]
Next, a method of manufacturing the speaker diaphragm is to apply a resin of the same kind as
the bonding resin of the diaphragm 1 on a part of the voice coil bobbin 3 and thermally fuse the
diaphragm 1 and the voice coil bobbin 3 It is characterized by integrating.
[0010]
In the speaker diaphragm of such a configuration and the method of manufacturing the same,
since a composite of polyimide fiber and carbon fiber woven with resin is used for the
diaphragm, high elasticity is suitable. Because a diaphragm having a large internal loss is
obtained and a polyimide film is used for the voice coil bobbin, a lightweight, high rigidity, and
heat resistant voice coil bobbin can be obtained.
Furthermore, since the diaphragm and the voice coil are made of the same material polyimide,
the diaphragm and the voice coil bobbin can be thermally fused and integrated at the same time
when the diaphragm is formed, without increasing the weight of the diaphragm The transmission
loss between the diaphragm and the voice coil can be reduced.
In addition, even if a resin of the same type as the bonding resin of the diaphragm is applied to
the voice coil bobbin and thermally fused to be integrated, the transmission loss between the
diaphragm and the voice coil can be reduced.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a cross-sectional view of a
speaker diaphragm and a diaphragm molding die according to an embodiment of the present
invention. 2 is a voice coil, 3 is a voice coil bobbin, 3a is a petal-like cut portion, 4 is an epoxy
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resin, 5 is a diaphragm molding die, 5a is a concave mold, and 6 is a voice coil bobbin insertion
portion.
[0012]
In the embodiment of the present invention, a petal-like cut portion 3a is provided on the voice
coil bobbin 3 made of polyimide film, and the petal-like cut portion 3a is coated with an epoxy
resin 4 to form a concave shape of the diaphragm molding die 5. After inserting the voice coil
bobbin 3 into the voice coil bobbin insertion portion 6 of the mold 5a, a polyimide fiber bundle
(1000 filaments) and a carbon fiber bundle (1000 filaments) of polyimide fiber having a tensile
strength of 300 kg / mm2 and a tensile elastic modulus of 14000 kg / mm2. And flat-woven at a
fiber bundle density of 12.5 fibers / inch and bonded with an epoxy resin to form a cone shape
by the diaphragm molding die 5 in a cone shape, and at the same time bonding the diaphragm 1
Epoxy resin as resin and epoxy resin applied to voice coil bobbin 3 There the voice coil bobbin 3
is integrated with heat-sealed to the diaphragm 1 bonded to.
Thus, the speaker diaphragm according to the present invention is obtained.
[0013]
Although the speaker diaphragm according to the present invention and the method of
manufacturing the same have been described in detail based on the embodiments considered to
be representative, the embodiments of the speaker diaphragm according to the present invention
and the method of manufacturing the same are as follows. The presence or absence of the cut
portion of the voice coil bobbin, or the shape thereof, the presence or absence of the resin to be
applied to the voice coil bobbin, the method of weaving polyimide fibers and carbon fibers, the
material of thermoplastic resin or thermosetting resin bonding polyimide fibers In the above, the
present invention is not limited to the structure of the above-mentioned embodiment, includes
the constituent requirements described in the above-mentioned claims, exhibits the action
according to the present invention, and has the effects described below. Can be implemented.
[0014]
In the speaker diaphragm according to the present invention, the diaphragm (in which the
conventional carbon fiber woven fabric is bonded with an epoxy resin) and the diaphragm of the
embodiment have elasticity (Young's modulus E) and internal loss ( In comparison with tan δ), E
= 1500 kg / mm 2 and tan δ = 0.018 for the conventional diaphragm, whereas E = 1350 kg /
mm 2 and tan δ = 0.030 for the diaphragm of the embodiment. In the diaphragm of the
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example, the elasticity (Young's modulus E) was slightly smaller than that of the conventional
diaphragm, but still sufficiently high elasticity was obtained, and the internal loss (tan δ) was
considerably larger than that of the conventional diaphragm.
[0015]
Further, since the voice coil bobbin used was a voice coil bobbin made of a polyimide film, a
lightweight, high rigidity, excellent in heat resistance was obtained.
[0016]
Next, in FIG.
A diaphragm in which a woven fabric made of polyimide fiber and carbon fiber is bonded with an
epoxy resin and a voice coil bobbin made of a polyimide film bonded with an adhesive;
The sound pressure frequency characteristic with the speaker diaphragm in the Example of this
invention is shown.
[0017]
As apparent from FIG. 2, in the speaker diaphragm in the embodiment of the present invention,
the diaphragm and the voice coil bobbin are thermally fused and integrated, so that the
transmission loss between the diaphragm and the voice coil is reduced. The speaker diaphragm
with excellent acoustic characteristics is realized by eliminating peaks and dips seen in the
middle range of the frequency characteristics of the bonded diaphragm and voice coil bobbin, but
with flat frequency characteristics in the middle and high range. It was obtained.
[0018]
Brief description of the drawings
[0019]
1 is a cross-sectional view of a speaker diaphragm and a diaphragm molding die according to an
embodiment of the present invention.
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[0020]
Fig. 2 Sound pressure frequency characteristics of the speaker diaphragm in the same
embodiment.
[0021]
Explanation of sign
[0022]
DESCRIPTION OF SYMBOLS 1 diaphragm 2 voice coil 3 voice coil bobbin 3a petal-like cut part 4
epoxy resin 5 diaphragm molding die 5a concave mold 6 voice coil bobbin insertion part
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