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JPH0357400

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DESCRIPTION JPH0357400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm, and more particularly, to a speaker diaphragm having a stern die structure
which is excellent in high frequency range frequency characteristics. (Prior Art) Generally, the
characteristics required for the speaker diaphragm include (a) small surface density and (ii) large
specific elastic modulus E / ? (here, E: elastic modulus, ? Density), (iii) having a suitable internal
loss tan ?, and (ii) having a high flexural rigidity, etc. are required. In particular, in the case of a
cone-shaped diaphragm, the inner peripheral portion (voice coil Ill) must accurately propagate
the vibration of the voice coil bobbin, so a large specific elastic modulus is required. On the other
hand, since the outer peripheral portion (edge side) must absorb the reflection vibration from the
edge, it is ideal that the internal loss is moderately large. A three-layer sandwich structure in
which a skin material made of a fiber reinforced plastic thin film is bonded to both sides of a core
made of a core material such as a honeycomb core made of metal or polymer thin film as a
conventional speaker diaphragm There is what you have. And as a base material of the abovementioned skin material, carbon fiber. One using #I made of glass fiber, aromatic polyamide
fiber, etc. is disclosed. [Problems to be Solved by the Invention] However, the speaker diaphragm
having a conventional three-layer sandwich structure based on carbon fiber or glass fiber as a
base has a large elastic modulus of the base, so it has a sand-inch. Although the specific elastic
modulus of the structure is large and the structure is effective as a diaphragm, the internal loss is
generally small because the specific elastic modulus and the internal loss are in inverse
proportion to each other. There is a problem that it can not fully meet the required
characteristics of the In addition, the speaker diaphragm based on aromatic polyamid fiber is
carbon! Although the internal loss is larger than that based on am or glass kI7A fiber, there is a
problem that the specific elastic modulus does not reach the ideal characteristic level. The
present invention was made to solve the problems of the prior art as described above, and has a
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large specific elastic modulus, an appropriate internal loss, and a speaker satisfying the
characteristics required for a speaker diaphragm. It aims at providing a diaphragm for this.
(Means for Solving the Problems) For this reason, in the speaker diaphragm according to the
present invention, a three-sided sand-inch structure in which a skin material made of a fiber
reinforced plastic capsule is adhered to both sides of a core material made of core material. In a
speaker diaphragm having a speaker, mixed jaIa in which three single yarns of carbon fiber,
aromatic polyamide 1a # l and high tension polyethylene fiber are interwoven as a base material
of at least one of the skin materials. The object of the invention is achieved by using cloth.
[Operation] When the speaker diaphragm in the present invention is attached to the speaker
frame and connected to the voice coil and used in the same manner as the conventional one, the
speaker diaphragm has a high specific elastic modulus, Since the vibration is transmitted
faithfully and has a proper internal loss, it absorbs the reflection vibration from the edge, and the
frequency characteristic in the high range is small. An embodiment of the present invention will
be described below with reference to the drawings. FIG. 1 is a side sectional view of a speaker
diaphragm according to an embodiment of the present invention, FIG. 2 is a plan view of a base
material of this embodiment, and FIG. 3 is an AA view of FIG. It is a cross section. In FIG. 1,
reference numeral 1 denotes a speaker diaphragm, which is formed in a cone shape, and each
skin material 3.4 is adhered to the inside and the outside of a core material (core material) 2
composed of a honeycomb core of aluminum foil. And form a three-layer sandwich structure.
Each surface covering material 3.4 is based on a woven fabric 8 in which a single yarn 5 of at
least one of carbon IIm miscellaneous, a single yarn 6 of an aromatic polyamide fiber and a single
yarn 7 of high tension polyethylene MIm are plain-woven, This is impregnated with resin and
heated. It is hardened by pressure and made into fiber reinforced plastic. Next, a method of
manufacturing the speaker diaphragm of this embodiment will be described with reference to
FIG. In FIG. 2, a single yarn 5 consisting of carbon fibers with a diameter of 7 ?m is placed on
the longitudinal axis, and then a single yarn 6 of aromatic polyamide fiber and further a single
yarn 7 of high tension polyethylene fiber are arranged. Repeat placing the fibers below. Also, the
horizontal axis is the same as above. Each of the respective yarns 5.6.7 is interwoven to form a
mixed woven fabric 8. Then, the woven fabric 8 is impregnated with an epoxy resin and heatcured while being pressed to obtain skin materials 3 and 4 having a volume content of 5 fibers of
about 50% and a thickness of 0.12 mm. On the other hand, the core material 2 is made of an
aluminum foil having a thickness of 0.05 sm, and an aluminum honeycomb core having a cell
size of 3/16 inch and a thickness of 3 is used. Bonding was performed on both sides of 2 and 5
by heating and pressure to obtain a speaker diaphragm of a three-layer sand-inch structure.
Hereinafter, the test results of the speaker diaphragm of this embodiment will be described. The
values of the specific elastic modulus E / tan and the internal loss tan ? obtained by the
vibration reed method for the sample obtained by the above manufacturing method are shown in
Table 1. In Table I, as a comparative example, the results of a three-layer sandwich board based
on a woven fabric consisting of carbon fiber and glass fiber roving, and a conventional paper
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cone are also shown.
As apparent from Table 1, Table 1, using the surface material of the mixed & i silk t5c in which
the carbon delicate, aromatic polyamide fiber and high tension polyethylene fiber of this example
are interwoven The specific modulus of elasticity is almost the same as that of the conventional
glass fiber, and the internal H loss is almost the same as that of the conventional paper cone, and
the piston movement area is expanded about twice compared to the conventional paper cone
diaphragm k1 In addition, since the internal loss is large, the frequency characteristic in the high
11 region is small, the inherent sound unique to the honeycomb diaphragm disappears, and the
speaker diaphragm having a three-layer sandwich structure that is extremely effective is
obtained in terms of physical properties and audibility. It can be understood that In addition, as a
core material to be a core material, a core material such as a honeycomb core made of metal (1 iii
j in the embodiment) or thin ++ i of high r-material month can be used. The number of rows may
be increased. Also, in the above example, 8 single yarns C of carbon fiber, aromatic polyamide
fiber and high tension polyethylene fiber powder were straight {7 ?m, but 7 to 10 ?m ( The f +
range is preferred. In addition, the weave method is for each m yarn on the vertical axis. It is 1 ',
1, 1's to arrange and weave in order respectively on the horizontal axis. As described above, it is
preferable to weave three kinds of ij yarns in order to form a mixed weave fabric and to use it as
a skin material, but after making two or three pieces of the same fiber into another, other fibers
You may use what was changed into and interwoven. As described above, when such a rope is
used as the base material of one skin material, conventional carbon fibers are used as the base
material of the other skin material. Using a woven fabric of aromatic polyamide Ml fiber, glass
fiber, etc., these substrates are impregnated with a resin such as epoxy resin and heated and
pressed to cure the resin to form a fiber reinforced plastic to form a skin material. And this skin
material can be piled up on both sides of the above-mentioned core material, it adheres, it can be
considered as sandwich structure, and it can also produce a diaphragm of ? to force. As
described above, according to the present invention, the carbon fiber, the aromatic polyamide
fiber and the high tension polyethylene fiber 38! Since a mixed JIJIm cloth in which single yarns
are woven is used as a substrate, there is an effect that a diaphragm for a speaker having a large
specific elastic modulus, an appropriate internal loss, and excellent frequency characteristics in a
high frequency range can be obtained. .
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a side sectional view of a speaker diaphragm according to an embodiment of the present
invention, FIG. 2 is a plan view of a base material of this embodiment, and FIG. 3 is an A-Alli plan
view of FIG. .
1 ииииии Diaphragm for speaker 2 ииииии Single core material 3.4 ииииии Surface material 5 ииииии Carbon
fiber thread 6 ииииии Aromatic Boar Amitweat M single yarn 7
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ╗
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