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DESCRIPTION JPH03289298

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DESCRIPTION JPH03289298
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dust cap for a cone type speaker. [Description of the Related Art] As is well known, a dust cap of
a cone type speaker is located near the center of a diaphragm and has a function of shielding
foreign substances such as dust, but in particular the dust cap coupled to the root of the
diaphragm. Since the vibration mode of the diaphragm is affected, it is required that the rigidity
be large to some extent and the vibration absorbing force for suppressing abnormal resonance of
the diaphragm be relatively large. A typical structure of a conventional dust cap is, for example,
(1) one obtained by molding a single material such as pulp, metal, synthetic resin, or (2) a carbon
fiber woven fabric or the like impregnated with a thermosetting resin and then heat-formed. (3) A
carbon fiber woven fabric or the like and a thermoplastic synthetic resin sheet are laminated and
heat-molded or the like has been put to practical use. [Problems to be Solved] In the conventional
dust cap having such a structure, it is difficult for the dust cap belonging to (1) to have both the
rigidity and the vibration absorbing force due to the properties of the material, and belongs to (2)
The dust cap has a low impact resistance and a low water resistance and long-term stability
because the fiber binder is a thermosetting resin. Furthermore, the molding cycle at the time of
production is long, and the preservability of the molding material prepreg is not good. In the case
of using a polypropylene resin as the thermoplastic synthetic resin sheet, for example, the dust
cap belonging to (3) has a problem to be solved that a high pressure press is required because
the drape during molding is bad. Therefore, the present invention solves the problems of the
above-described conventional example by using a composite of inorganic high elastic fiber and
thermoplastic synthetic resin fiber, and provides a speaker dust having both high rigidity and
large internal loss. Intended to provide a cap. [Means for Solving the Problems] The dust cap of
the speaker according to the present invention for extending the above-mentioned purpose is
made of inorganic high elasticity fiber and thermoplastic synthetic resin fiber, and the inorganic
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high elasticity fiber is heated. A speaker dust cap characterized in that it is bonded and
composited by thermoplastic synthetic resin fibers melted at the time of molding. [Operation] If
the inorganic high modulus fiber is melt-bonded and complexed with the thermoplastic synthetic
resin fiber as in the dust cap of the above configuration, the bulk thermoplastic synthetic resin
and the inorganic high modulus fiber are mixed. Since the apparent density can be lowered by
using a thermoplastic synthetic resin in which the two types of materials are fibrous and the
internal loss is large at normal temperature as compared with the materials described above, The
value of () / (density)) and (lx n ?) representing internal loss can both be increased.
Conventionally, composite of inorganic high elastic fiber and thermoplastic synthetic resin is
prepared by thermocompressing thermoplastic synthetic resin sheet from both sides of inorganic
high elastic fiber woven sheet to prepare a composite sheet, and the composite sheet is formed
into a predetermined shape. Depending on the press molding method, the thermoplastic
synthetic resin sheet itself has poor elongation in the state of this composite sheet, and heat
transfer during pressing is poor, so when forming into a dome shape like a dust cap, draw
forming In the method of the present invention, two types of materials are used to form a
composite, while the pressing pressure needs to be increased because the properties are not
good and the distribution of the thermoplastic synthetic resin after molding can only be uneven.
Since the fibers are formed in the form of fibers in proximity to each other or in a mixed state,
the heat conduction of the material is good and the distribution of the thermoplastic synthetic
resin becomes uniform. Furthermore, since both fibers are thermoplastic synthetic resin fibers,
they are excellent in impact resistance and storability, and molding time can be shortened. In
addition, since the drapability and wettability are excellent as compared with the conventional
sheet-like thermoplastic synthetic resin composite, there is no void and the quality is stabilized.
[Example] Plain woven fabric of carbon fiber as inorganic high elasticity fiber, plain woven fabric
of PP (polyphenylene sulfide resin ... melting point 270 ░ C) fiber as thermoplastic synthetic
resin fiber, plain woven fabric of carbon fiber A plain woven fabric of PP fibers was stacked on
both sides to form three layers, and pressed for 11 minutes at 270 ░ C. with a dome-shaped
mold to obtain a dust cap for a speaker. The values of Iga ?, Young's modulus E1 density ? ?
? and E / ? at normal temperature of the dust cap are shown in Table 1. The above physical
property values of the conventional dust cap obtained by laminating a carbon fiber woven fabric
and a polypropylene sheet are shown simultaneously for comparison. From these results, the
composite dust cap of the present invention exhibits high elasticity and large tgn? as compared
with the prior art. Table 1 However, E: Young's modulus unit ииииии dyne / car ??: density ? ░░
g "/ cl '? As a means of obtaining the composite of the present invention, a woven fabric (cross
woven, triaxial, triaxial) comprising a long fiber system (commingled yarn) mixed with inorganic
high elastic fiber and thermoplastic synthetic resin fiber as a first modification of the above
embodiment It can be obtained by forming a woven layer, a disc woven layer, etc.) in layers or in
a plurality of layers. Further, as a second modification, the surface of the inorganic high modulus
fiber may be formed by layering one or more layers of a woven fabric of a brid matrix in which
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thermoplastic synthetic resin fibers are wrapped. Alternatively, means of using a woven fabric in
which two types of fibers are mixed and woven can be considered as the third modification.
Although the dust cap of the speaker according to the present invention has been described in
detail based on the example considered to be representative, the embodiment of the dust cap
according to the present invention is the structure of the above embodiment in the material resin
etc. The present invention is not limited to the above, 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 dust
cap of the speaker according to the present invention has high rigidity and low apparent density
because the inorganic high modulus fiber is melt-bonded and composited with the thermoplastic
synthetic resin fiber. Because it is possible to increase both the value of (Young's modulus) /
(density) and 11? representing the internal loss. In addition, since thermoplastic synthetic resin
fibers are used, they are excellent in impact resistance, water resistance, long-term stability and
storage stability. Furthermore, since the two types of materials forming the composite are formed
close to each other in the form of fibers, the thermal conductivity of the material is good, the
productivity is good, and the forming time can be shortened. In addition, since the fibers are in a
semi-mixed state, the distribution of the thermoplastic synthetic resin becomes uniform, and the
voids are excellent in the drapability and wettability as compared with the conventional sheetlike thermoplastic synthetic resin composite. The effect is that the quality is stabilized.
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