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JPH0614389

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DESCRIPTION JPH0614389
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm of a speaker used in various types of acoustic equipment, and more particularly to a
diaphragm in which a fibrous base material is shaped by a synthetic resin.
[0002]
2. Description of the Related Art As is well known, the diaphragm of a speaker is generally a
general one except a special one such as a soft dome diaphragm in order to suppress the abovementioned vibration which causes distortion or noise of reproduced sound. High elasticity and
high internal loss are required, and pulp and other fibers are made into paper and pressed, fibers
impregnated with resin as a filler, metals, synthetic resins, and laminates of these are used. But
[0003]
In the conventional hard diaphragm having the above-mentioned structure, for example, in the
case where a high-rigidity fibrous material is impregnated with a resin as a filler, the rigidity is,
for example, carbon as a fibrous material. Although satisfactory values can be obtained by using
fibers, there is a problem in the assembly process due to the lack of adhesion when using
polypropylene etc. having a large internal loss as a filler, and considering the position as a
product, in all cases rigidity and It was difficult to maintain a good balance with mechanical
internal loss, and there was a problem to be solved that many speakers had unnatural
reproduced sound.
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1
[0004]
Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and has
a high rigidity and a vibration energy absorbing ability to extend a reproduction frequency range
and a diaphragm having an action to suppress abnormal vibration even in high frequencies. It is
an object of the present invention to provide a speaker of excellent quality having reproduced
sound with less distortion and flat frequency characteristics.
[0005]
A first invention of the present application for achieving the above object comprises a high
elastic fiber and a thermosetting resin for fixing the high elastic fiber and maintaining its shape,
and the thermosetting Speaker diaphragm characterized in that the conductive resin is an epoxy
resin modified mainly with butyl acrylate (hereinafter abbreviated as BA) and having a reactive
elastomer having an epoxy group in the side chain, and the second invention Is composed of a
high elastic fiber and a thermosetting resin which fixes the high elastic fiber and holds its shape,
and the thermosetting resin is BA, vinylbenzyl glycidyl ether (abbreviated as VBGE) and styrene
(abbreviated as St) The speaker diaphragm according to the present invention is an epoxy resin
modified with a ternary copolymer having a molar ratio in the range of 62:22:16 to 73:17:10,
respectively.
[0006]
[Function] By modifying the epoxy resin with a reactive elastomer having an epoxy group in the
side chain as in the above-mentioned BA, it is possible to impart flexibility and high toughness to
the epoxy resin. By using a flexible, high toughness modified epoxy resin as a shaping material
for the base of high rigidity fiber, both the Young's modulus and internal loss of the diaphragm
as a vibration system component become large, and high rigidity and vibration are obtained. It
has an energy absorbing ability to suppress abnormal vibration of a diaphragm etc., and
improves the frequency characteristics in the middle and high range, and also improves the
adhesion to other parts constituting the vibration type. Workability will be significantly
improved.
[0007]
EXAMPLE A reactive elastomer consisting of a ternary copolymer of BA: VBGE: St in a molar ratio
of 62:22:16 (the molecular structure is shown in FIG. 1) was prepared and used as a general
bisphenol A epoxy resin. The mixture was mixed at a rate of 30 wt%, and reacted at 110 ° C.
with stirring to obtain a target modified epoxy resin.
[0008]
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2
A PAN type carbon fiber non-woven fabric (basic weight 30 g) was impregnated with the above
modified epoxy resin, and molded at a temperature of 160 ° C., a press pressure of 5 kg / cm 2
and a press time of 15 minutes to obtain a diaphragm and a test flat plate sample.
[0009]
Also, as a conventional example for comparison, the same PAN-type carbon fiber non-woven
fabric (30 g basis weight) is impregnated with bisphenol A epoxy resin, molded at a temperature
of 160 ° C., a press pressure of 5 kg / cm 2, and a press time of 15 minutes. A plate and a test
plate sample were obtained.
[0010]
The Young's modulus E, internal loss (tan δ), and density of the test flat samples of these
examples and the conventional example were measured and are shown in FIG.
[0011]
In addition, the molar ratio of BA, VBGE, St in the reactive elastomer consisting of the terpolymer,
and the mixing ratio of the reactive elastomer and the bisphenol A epoxy resin in the modified
epoxy resin of the present invention are changed. The change of the fracture toughness value in
the case is shown in the graph of FIG.
According to this result, the molar ratio of BA, VBGE, St is in the range of 62:22:16 to 73:17:10,
and the mixing ratio of the reactive elastomer to the bisphenol A epoxy resin is 25. It is clear that
the fracture toughness is good at the time of% or more.
[0012]
The frequency characteristics in the case where the above-described example diaphragm and the
conventional example diaphragm are applied to a speaker are shown in FIG. 4 respectively.
In FIG. 4, the solid line shows the characteristics of the speaker using the example diaphragm,
and the dotted line shows the characteristics of the speaker using the conventional example
diaphragm. When comparing the both, the frequency characteristics of the example peak at 2
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3
KHz or more.滑 ら か, 滑 ら か 有 滑 ら か 的 滑 ら か 性 ,、 示 出 在 基基 材 中 図
2 所示 的 物
理 値 表 特 徴 的。 It has a smooth, low dip, indicating the characteristics of the substrate shown
in FIG.
[0013]
The speaker diaphragm according to the present invention and the method of manufacturing the
same have been described in detail based on the example considered to be representative.
However, the diaphragm according to the present invention, types of raw materials such as
polyol and polyisocyanate, and manufacturing method The embodiment of the present invention
is not limited to the structure of the above-described embodiment, but includes the constituent
features described in the appended claims, and exhibits the effects of the present invention and
has the effects described below. It may be modified as appropriate.
[0014]
The speaker diaphragm according to the present invention has the following effects.
[0015]
The diaphragm of the present application uses high-rigidity fibers as a base material, and since
the epoxy resin which is the excipient is modified to be flexible and have high toughness by
modification, the Young's modulus of the diaphragm as a vibration system component, The
internal loss is both large, and the high rigidity and the vibration energy absorbing ability
suppress and change the abnormal divided vibration mode of the diaphragm to improve the
frequency characteristic in the high region as shown in FIG.
Therefore, it is possible to inexpensively provide a speaker of excellent quality having
reproduced sound with less distortion and flat frequency characteristics.
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