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JPH03201795

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DESCRIPTION JPH03201795
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker, and more particularly to a diaphragm for a speaker manufactured by
heat and pressure molding a resin-impregnated woven fabric. [Background Art] Conventionally, a
thermosetting resin is impregnated into a woven fabric of high strength polyethylene fibers or a
woven fabric consisting of high density polyethylene fibers and other organic fibers or inorganic
fibers, and after semi-drying, the resin impregnated woven fabric There is a speaker diaphragm
in which a cloth is heat-pressed into a predetermined diaphragm shape. [Problems to be Solved
by the Invention] In the diaphragm with a valve, although it was relatively easy to change the
elastic modulus and density (internal loss) of a part of the diaphragm by papermaking
technology, it was possible to form a polymer film In the case of a diaphragm or a diaphragm
manufactured by hot pressing of the FRP material as described above, it is difficult to change the
elastic modulus of a part of the diaphragm, and the elastic modulus is the same in all parts. By
changing the shape and thickness of the cross section of the diaphragm, the frequency
characteristic of the speaker unit of the diaphragm to be used was controlled. An object of the
present invention is to provide a speaker diaphragm in which the elastic modulus can be partially
changed and the frequency characteristics of the speaker can be controlled without changing the
cross-sectional shape or thickness of the diaphragm. . [Means for Solving the Problems] In order
to achieve the above object, in the present invention, heat curing is performed on a woven fabric
using high-strength polyethylene fibers (density 0.98 or less, elastic modulus 10800 Kg / llm ").
Resin, and after semi-drying, this resin-impregnated woven fabric is hot-pressed to produce a
diaphragm for a speaker, the elastic modulus of high-strength polyethylene fiber is 1/2 or less of
a portion of the resin-impregnated woven fabric Forming a low elasticity part in a part of the
diaphragm by thermoforming under temperature conditions, ie, in a range of 120 ° C. to 150 °
C., and providing a part having an elastic modulus different from other parts and an internal loss
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To control the frequency characteristic of the speaker. In this case, the low elastic portion should
be formed in a divided manner or in a ring shape, etc. to balance the entire diaphragm.
[Operation] A portion of the resin-impregnated woven fabric has a temperature of 120 ° C to
150 ° C when the resin-impregnated woven fabric is hot-pressed using a diaphragm molding die
capable of partially controlling the heating temperature. It is set so as to be within the range, and
it is hot-pressed. Alternatively, in the first step, uniform temperature molding is performed at a
temperature of 130 ° C. or less, and in the second step, a portion is set to be in the range of 120
° C. to 150 ° C. using a mold. Do.
In the speaker diaphragm thus obtained, the elastic modulus of the high strength polyethylene
fiber in the low elastic portion formed in a part thereof is reduced to half of the elastic modulus
of the high strength polyethylene fiber in the other part Therefore, since the propagation speed
is reduced in this part, the propagation of high frequency can be controlled in this part.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present
invention will be described with reference to the drawings. FIG. 1 is a plan view of a cone type
diaphragm, FIG. 2 is a side view of the same, and FIGS. FIG. 5 shows an example of a domeshaped diaphragm, FIG. 5 (A) is a plan view, and FIG. 5 (B) is a side view. FIG. 6 is a frequency
characteristic comparison diagram comparing the frequency characteristic of a speaker using the
diaphragm of FIG. 1 with the frequency characteristic of a speaker using a conventional
diaphragm. In the figure, reference numeral 1 denotes the entire diaphragm for a speaker, which
is a woven fabric using high strength polyethylene fibers (density 0.98 or less, elastic modulus
10800 Kg / m + a ′ ′) or high density polyethylene fibers and other organic fibers
Alternatively, a woven fabric consisting of inorganic fibers is impregnated with a thermosetting
resin and dried, and then the resin-impregnated woven fabric is manufactured by hot-pressure
forming. When the diaphragm 1 is hot-pressed, the resin-impregnated woven fabric The low
elastic portion 2 is formed on a part of the diaphragm by thermoforming a part of the sheet at a
heating temperature of 120 ° C. to 150 ° C. Example 1 High Strength Polyethylene Fiber
(Density 0.98 or Less. While forming a woven fabric with an elastic modulus of 10,800 Kg / mm
"), it is impregnated with a thermosetting resin such as an epoxy resin and dried to such an
extent that the resin tackiness disappears. The resin-impregnated woven fabric is heated and
pressed with a die for forming a cone-shaped diaphragm, and the die is one which can partially
control the heating temperature. The heating temperature of a part, for example, a ring or
concentric part, was set to be in the range of 120 ° C. to 150 ° C., and the other part was
molded at 120 ° C. In the diaphragm 1 obtained by this, a ring-shaped as shown in FIGS. 1 and
2 and a concentric low-elasticity portion 2 as shown in FIG. 3 are formed. The modulus of
elasticity of the high strength polyethylene fiber is half of that of the high strength polyethylene
fiber in the other part. In addition, in the case of the above-mentioned hot-pressure molding,
uniform temperature molding is carried out at a temperature of 130 ° C. or less in the first step,
and a part is within the range of 120 ° C. to 150 ° C. using a cylinder mold in the second step.
It may be set and hot-pressed.
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Example 2 A woven fabric was woven with organic fibers having a melting point of 150 ° C. or
more and the high-strength polyethylene fibers (density 0.98 or less, elastic modulus 10800 Kg /
mm ′ ′), and the other conditions were the same as in Example 1. The elastic modulus of the
high strength polyethylene fiber in the low elastic part 2 of the diaphragm 1 obtained by this was
1/2 of the elastic modulus of the high strength polyethylene fiber of the other part. Example 3
Woven with an inorganic fiber having a glass point transfer of 90 ° C. or higher (carbon fiber in
the example) and the high-strength polyethylene fiber (density 0.98 or less, elastic modulus
10800 Kg / mm ′ ′) as a woven fabric, Others were the same as in Example 1. The same result
as in Example 1 was obtained for the diaphragm obtained by this. Bucune of the low elasticity
portion 2 to be formed may be divided as shown in FIG. 4, and in the case of a dome-shaped
diaphragm or chamber, as shown in FIG. You may form. FIG. 6 shows frequency characteristics A
of a speaker incorporating the cone-shaped diaphragm l obtained in Example 1 into a speaker
unit, and a speaker using a conventional cone-shaped diaphragm having a uniform heating
temperature at 120 ° C. It is a frequency characteristic comparison figure with frequency
characteristic B, and it turns out that high frequency characteristic is suppressed compared with
conventional thing B in A by Example 1 evidently also from this comparison figure. [Effects of the
Invention] According to the speaker diaphragm of the present invention, in a diaphragm
manufactured by heat and pressure molding a resin-impregnated woven fabric, it is possible to
use the speaker without changing the shape and thickness of the diaphragm. The frequency
characteristics can be controlled, and in addition to this, control can be made easier by
combining means for changing the shape and thickness of the diaphragm. As described above,
there is an effect that control of frequency characteristics that can not be conventionally
performed by the same woven fabric can be easily performed.
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows an embodiment of a speaker diaphragm according to the present invention, FIG. 1 is
a plan view of a cone-shaped diaphragm, FIG. 2 is a side view of the same, and FIGS. FIG. 5 shows
an example of a dome-shaped diaphragm, FIG. 5 (A) is a plan view, and FIG. 5 (B) is a side view.
FIG. 6 is a frequency characteristic comparison diagram comparing the frequency characteristic
of a speaker using the diaphragm of FIG. 1 with the frequency characteristic of a speaker using a
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conventional diaphragm. Fig. 1 Fig. 3 Fig. 5 1: Whole diaphragm, 2: Low elasticity part
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