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JPH0490297

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DESCRIPTION JPH0490297
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm, and more particularly to a diaphragm of a dynami-.nu. [Prior Art] In a
diaphragm of a speaker, as is well known, 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 material
constituting the diaphragm Since it is not a perfect rigid body, it is difficult to perform piston
movement except in the very low frequency band, and usually it is a high-order split vibration
mode and the frequency characteristics deteriorate. The material constituting the diaphragm is
required to have as high rigidity as possible and a relatively high vibration energy absorbing
ability, as far as the material constituting the diaphragm in order to suppress expansion and the
generated divided vibration. A typical structure of a conventional diaphragm is, for example, (1)
one obtained by molding a single material such as pulp, metal or resin, (2) a carbon fiber woven
fabric or the like impregnated with a thermosetting resin and then heat-formed. (3) A laminate
obtained by laminating a thermoplastic resin sheet with a carbon fiber woven fabric or the like
and heat-molding the same has been put to practical use. [Problems to be Solved] In the
conventional diaphragm having such a structure, it is difficult for the speaker diaphragm
belonging to the above (1) to have both the rigidity and the vibration absorbing force, depending
on the properties of the material (2 The speaker diaphragm belonging to the above has a low
impact resistance, water resistance and long-term stability because the binder is a thermosetting
resin. Furthermore, the molding cycle at the time of production is long, and those in which the
molding material is in the form of a prepreg have poor storage stability. And when the diaphragm
which belongs to (3) uses a polypropylene resin for a thermoplastic resin, for example, since the
drape at the time of shaping ¦ molding is bad, the subject which should be solved that a high
pressure press was required occurred. SUMMARY OF THE INVENTION It is an object of the
present invention to solve the problems of the prior art and to provide a speaker diaphragm
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having high rigidity and internal loss (tan δ). [Means for Solving the Problems] In the speaker
diaphragm according to the present invention for achieving the above object, the inorganic high
elasticity fiber is put in a thermoplastic resin pipe, and the space in the thermoplastic resin pipe
is made of the thermoplastic resin. A speaker diaphragm characterized in that a woven fabric
made of fiber bundles filled with a thermoplastic resin powder of the same material as a resin
tube is heated, and a thermoplastic resin portion is uniformly melt-molded. The speaker
diaphragm is characterized in that the carbon fiber is carbon fiber. [Function] When the
inorganic high modulus fiber is uniformly melt-bonded and composited with a thermoplastic
resin as in the speaker diaphragm according to the present invention, a thermoplastic resin with
large internal loss and low density at normal temperature is used. By using it, the apparent
density of the composite can be lowered, so that the values of (Young's modulus E / density ρ)
and the internal loss tan δ can both be increased.
Conventionally, composite of inorganic high elasticity fiber and thermoplastic resin is performed
by thermocompression bonding of thermoplastic resin sheet from both sides of inorganic high
elasticity fiber woven sheet to prepare a composite sheet, and press molding this composite sheet
into a predetermined shape In the state of this composite sheet, the expansion of the
thermoplastic resin sheet itself is poor, and the heat transfer during pressing is poor, so it is
necessary to increase the pressing pressure, and the distribution of the thermoplastic resin after
molding However, in the configuration of the present invention, the distribution of the
thermoplastic resin is uniform. Moreover, since a thermoplastic resin is used, it is excellent in
impact resistance, water resistance, long-term stability and storage stability. In addition, since the
drapability and wettability are superior to those of conventional thermoplastic resin composites,
there is no void and the quality is stable. [Example] Carbon fiber is used for inorganic high
elasticity fiber, polypropylene powder is used for thermoplastic resin powder, this powder is
adhered to each carbon fiber, and polypropylene is added to thermoplastic resin. A fiber bundle
is produced by covering with the tube used. The woven fabric obtained by plain-weaving this
fiber bundle is heated with a far-infrared heater, and pressed with a cone-shaped mold
immediately before the thermoplastic resin portion is melted, whereby the speaker diaphragm
according to the present invention is obtained. The characteristics of the speaker diaphragm in
this embodiment are Young's modulus E = 1.46 × 10 ′ ′ dyne / ci, density = 1 = 1.18 g / cm 3
tan δ = 0.041. Next time, the conventional one obtained by thermocompression bonding of a
carbon fiber woven sheet from both sides with a polypropylene sheet and the molding time and
the bending strength of a molded article of the present invention are shown. The dispersibility of
the plastic resin is good, and the maximum strength is reached in a short time. The molding
pressure is also small <20 kg 10 ff is required to obtain the same strength as the conventional
one. As the inorganic high modulus fiber constituting the composite material of the present
invention, glass fiber etc. can be used in addition to the carbon fiber of the example, and as the
thermoplastic resin, polyethylene, nylon, polypropylene ethylene copolymer, polyamide imide
etc. General-purpose plastics, general-purpose engineering plastics, and general-purpose super
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engineering plastics can be used at any time. The speaker diaphragm according to the present
invention has been described in detail based on the embodiment considered to be representative,
but the embodiment of the speaker diaphragm according to the present invention is the material,
resin material, etc. The present invention is not limited to the structure, and can be appropriately
modified and implemented as long as it has the features described in the above-described claims,
exhibits the effects according to the present invention, and has the effects described below.
[Effect] The diaphragm for a speaker according to the present invention has the thermoplastic
resin powder attached to the inorganic high elasticity fiber, heats the woven fabric composed of
the fiber bundle containing this in the thermoplastic resin tube, and the thermoplastic resin
portion By uniformly melt-molding, the rigidity is high and the apparent density of the composite
material can be lowered, so that the values of E / ρ and tan δ can be increased. In addition,
since a thermoplastic resin is used, it is excellent in impact resistance, water resistance, long-term
stability and storage stability, and the carbon fiber is filled with a thermoplastic resin, and this is
a fiber bundle inserted in a thermoplastic resin pipe. Since this forms a woven fabric, the
inorganic high modulus fiber and the thermoplastic resin are molded in a state in which they
approach each other, so that the heat conduction is good, the productivity is good, and the
molding time can be shortened. And since distribution of a thermoplastic resin becomes uniform,
compared with the conventional thermoplastic resin composite material, since it is excellent in
drapability and wettability, it has an effect that there is no void and quality is stabilized.
[0002]
Brief description of the drawings
[0003]
The drawings show a molding time and a bending strength of a conventional speaker diaphragm
according to an embodiment of the present invention.
Patent Applicant Onkyo Co., Ltd.
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