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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker using a high elastic fiber in an electroacoustic transducer.
2. Description of the Related Art As is well known, in a speaker diaphragm, a localized portion of
the diaphragm, such as a central portion or a peripheral portion, is driven by a voice coil to emit
sound waves, but the diaphragm Since the material to be constructed is not a complete rigid
body, it is difficult to perform piston movement except in an extremely low frequency band, and
usually the high-order split vibration mode degrades the frequency characteristics. It is required
that the rigidity be as large as possible and the vibration energy absorbing ability be relatively
large as a material constituting the diaphragm in order to expand to a zone and suppress the
generated divided vibration.
In recent years, as a diaphragm for a speaker satisfying such conditions, woven fabrics, nonwoven fabrics, etc. of a mixture of high elastic fibers such as glass fibers, carbon fibers and
aramid fibers alone or two or more types of high elastic fibers What was made to combine, and
what was made to laminate further etc. with resin is used.
Among such conventional diaphragms for speakers, those using carbon fibers or aramid fibers
are known to have high elasticity, but woven fabrics comprising carbon fibers are made of resin.
Have a high stiffness (Young's modulus E) but not enough, and have a small internal loss (tan δ),
so they have the disadvantage of producing peaks and dips at specific frequencies in their
frequency characteristics. ing.
Although the speaker diaphragm made of aramid fiber woven fabric has high elasticity, it has
poor heat resistance, moisture resistance and weather resistance, and is unsuitable for use in
severe environments such as outdoors and vehicle cabins.
Therefore, the object of the present invention is to provide a speaker diaphragm which is
excellent in heat resistance, moisture resistance, weather resistance, rigidity and the like by
solving the drawbacks of the prior art.
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker diaphragm
according to the present invention for achieving the above object comprises a group of high
elasticity fibers using polyimide fibers and a group of high elasticity fibers. It is characterized in
that it is made of a thermoplastic or thermosetting synthetic resin, or the high elastic fiber group
is made of a woven fabric, or the woven fabric is made to cross a polyimide fiber bundle and a
carbon fiber bundle mutually. It is characterized by being a woven fabric.
The polyimide fiber used in the present invention is one spun from a polyimide soluble in an
organic solvent.
[Function] In the speaker diaphragm of such a configuration, polyimide fiber is used as the high
elastic fiber, so rigidity (Young's modulus E) and internal loss (tan δ) are large, and the
polyimide fiber Since the density ρ is small and further coupled by a resin, the apparent density
ρ of the speaker diaphragm is smaller and the value of E / ρ is larger.
Further, in the speaker diaphragm made of polyimide fiber as a woven fabric, the rigidity
(Young's modulus E) is greatly improved by the woven structure, compared to the conventional
speaker diaphragm made of unfiberized polyimide. Do.
In the case where the polyimide fiber and the high elastic fiber other than the polyimide fiber are
woven, the vibration inherent to each high elastic fiber is suppressed.
EXAMPLES The examples of the present invention will be described in detail.
In Example 1, a polyimide fiber bundle (1000 filaments) is plain-woven at a fiber bundle density
of 12.5 / inch, and this woven fabric is heat pressed into a cone shape using polypropylene as a
thermoplastic resin as a binding resin. By doing this, the speaker diaphragm according to the
present invention is obtained.
Next, as Example 2, plain weave of a fiber bundle density of 12.5 / inch is carried out so that a
polyimide fiber bundle (1000 filaments) and a carbon fiber bundle (1000 filaments) cross each
other, The diaphragm for a speaker according to the present invention is obtained by heat and
pressure molding in a cone shape using polypropylene which is a thermoplastic resin as a
bonding resin.
Although the speaker diaphragm according to the present invention has been described in detail
based on the embodiment considered to be representative, the embodiment of the present
invention is, for example, a fiber of polyimide fiber woven fabric and carbon fiber woven fabric.
Other high elastic fiber materials or combination methods to be combined with polyimide fibers,
such as laminating in different directions and heating / pressing in a cone shape using
thermosetting resin such as epoxy resin etc., combining high elastic fibers The present invention
is not limited to the structure of the above embodiment in the material of the thermosetting resin
or thermoplastic resin to be made, the method of bonding high elastic fibers, etc., and the present
invention can be equipped with the constituent requirements described in the above-mentioned
claims. As long as it exhibits the effect of the above and has the effects described below, it can be
modified as appropriate.
The physical properties of the speaker diaphragm obtained in Examples 1 and 2 and the speaker
diaphragm obtained by molding carbon fiber as the conventional example under the same
conditions as in Example 1 Physical properties are shown in Table 1.
As apparent from Table 1 above, the speaker diaphragm according to the present invention has a
rigidity (Young's modulus E) even when compared to a speaker diaphragm made of a
conventional carbon fiber woven fabric. Since the density が is small, the value of E / ρ is large,
the piston movement zone is expanded, the divided vibration is suppressed, and the acoustic
characteristics are excellent.
Also, polyimide is excellent in heat resistance, moisture resistance and weather resistance, and is
suitable for use in harsh environments such as outdoors or in a car, and in particular, the
diaphragm base material for a speaker using polyimide fiber is thermosetting. Resin bonded ones
are suitable for use at high temperatures.
The combination of a polyimide fiber and another high modulus fiber (for example, carbon fiber)
to form a woven fabric which is bonded by a thermosetting or thermoplastic synthetic resin is
subjected to vibrations inherent in each material. A speaker diaphragm having desired
characteristics can be obtained by selecting high-elasticity fibers that are excellent in acoustic
characteristics and combined to cancel each other.
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