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JPH0257096

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DESCRIPTION JPH0257096
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
means for constructing a diaphragm for an acoustic device having a large specific elastic
modulus and a large internal loss. [Prior Art] Generally, properties required of a diaphragm for an
acoustic device are to have a large specific loss E / P (E: elastic modulus, P: density) and a large
internal loss. That is, the higher the specific elastic modulus, the higher the limit resonance
frequency, and the reproduction frequency band is expanded. Further, as the internal loss is
larger, the sharpness of mechanical resonance is suppressed, and flattening of characteristics can
be expected. From this point of view, a diaphragm made of a composite laminate using two or
more different materials is devised to make the above mutually contradictory elements, in
particular, a large specific elastic modulus and a large internal loss compatible with each other.
In general, a diaphragm having a large specific modulus has a very small internal loss, and
particularly a metal plate such as aluminum having a large specific modulus has a small internal
loss, so good frequency characteristics can be obtained. Absent. Further, there is also a
diaphragm in which, for example, paper and a polymer type are pasted together in order to
increase the internal loss, but with this, there is a problem that the specific elastic modulus is
small and the limit resonance frequency becomes low. The present invention has been made to
solve the above-mentioned problems, and it is an object of the present invention to provide a
diaphragm having excellent formability as well as increasing the specific elastic modulus and
internal loss of the diaphragm. . [Means for Solving the Problems] The vibration and plate
according to the present invention has a core yarn (1) having a large specific elastic modulus and
a small internal loss, and spirally wound around this to provide a specific elastic modulus as
described above. A braided yarn (4) composed of an outer yarn smaller than the yarn and having
a larger internal loss is woven into a fabric sheet (5), which is then further impregnated with a
polymeric material to be integrally molded. [Operation] In the diaphragm of the present
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invention, the core yarn mainly gains rigidity, the outer yarn mainly secures a large internal loss,
and the air permeability is eliminated by the impregnated polymer material. An embodiment of
the present invention will be described below. That is, (4) in FIG. 1 has a large specific elastic
modulus and a small internal loss to the core yarn (1), a specific elastic modulus smaller than the
above-mentioned central yarn (1) and a large outside yarn (2) It is a braid obtained by spirally
winding (3). FIG. 2 is a plan view of this braided yarn (4) woven into a fabric sheet (5), which is
impregnated with a polymer material and subjected to heat and pressure forming to form the
diaphragm (6) of FIG. Are configured. By the way, carbon fibers, glass fibers, polyamide fibers,
polyimide fibers, polyester fibers, cotton fibers, silk fibers, wool fibers, etc. are selectively
selected as the above-mentioned core yarn (1) and outer yarn (2) (3). In combination with epoxy
resin, polyamide resin, polyimide resin, polyester resin, phenol resin, alkyd resin, melamine resin,
urea resin, diacrylic Phthalate resins and modified products thereof are used.
By selecting and using the above materials, a core yarn (1) having a large specific elastic modulus
and a small internal loss, and an outer yarn (2) and (3) having a smaller specific elastic modulus
and a larger internal loss, The outer yarn (2) (3) is spirally wound around the core yarn (1) to
constitute a braided yarn (4). Therefore, when forming the diaphragm (6) using the fabric sheet
(5) woven with this braided yarn, each core yarn (1) is applied even if a compressive force or an
extension force is applied to each outer yarn (2) (3) ) Maintain the overall rigidity. Then, on the
other hand, the core yarn (1) and the outer yarn (2) (3) and the outer yarn (2) (3) are adhered
and cured by the impregnated polymer material, and the shape of the diaphragm is retained and
its air permeability Is the one that has been erased. FIGS. 6 and 7 are characteristic diagrams
showing the comparison between the diaphragm of the present invention of the above
configuration and the conventional product, and as can be seen from these figures, the
diaphragm of the present invention has one frequency characteristic and sound pressure
distortion. It can be seen that is significantly improved compared to that of the conventional
product. In the above embodiment, the diaphragm (6) is formed of a single-plate molded product,
but as in the other embodiment of FIG. 4, it is bonded to another core material (6a). A diaphragm
may be formed, and further, as in the other embodiment of FIG. 5, this may be bonded to at least
one surface of the honeycomb structure (6b) to form a diaphragm. [Advantage of the Invention]
Since the diaphragm for acoustic device of the present invention is configured as described
above, the specific elastic modulus is maintained large, and the diaphragm with one large
internal loss is a simple cloth sheet and There is an effect that it can be obtained at low cost by
the impregnation molding operation of the polymer material to this.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is an enlarged front view showing an embodiment of a braid used in the diaphragm for an
acoustic device of the present invention, FIG. 2 is a plan view of a fabric sheet woven with this
braid, and FIG. FIG. 4 is a cross-sectional view of a diaphragm made of a molded article obtained
by impregnating a fabric sheet with a polymer material, FIGS. 4 and 5 are cross-sectional views
showing another embodiment of the diaphragm of the present invention, and FIG. FIG. 7 is a
comparison diagram of frequency characteristics of the diaphragm of the present invention, and
FIG. 7 is a comparison diagram of sound pressure distortion characteristics of the same
<conventional product and the diaphragm of the present invention.
In the figure, (1) is a core yarn, (2), (3) is an outer yarn, (4) is a braided yarn, and (5) is a fabric
sheet.
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