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A carbon fiber surface layer is laminated on both sides of a diaphragm intermediate layer for a
speaker, and is characterized in that the layers are combined by a binder of at least two or more
different polymers which co-crosslink. Speaker diaphragm.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
diaphragm, in particular a speaker diaphragm using carbon fiber sound. Recently, speaker
diaphragms using carbon fiber have come into the limelight. The following may be mentioned as
examples of such speaker diaphragms using carbon fibers. --(1) Length 1 to 6 mt of carbon short
fibers (chopped strands)-A diaphragm for a speaker molded by paper making. (2) A speaker
diaphragm made of a carbon fiber non-woven fabric and a foam or a material which is foamed by
heating and which is made of a resin as a valley agent. . (3) A speaker diaphragm for sandwiching
a carbon fiber woven fabric or non-woven fabric as an intermediate layer with a resin film
inserted therein. (4) A speaker wedge-moving plate molded by adding a resin as a binder to a
woven or woven fabric. Hemorrhoids are mentioned. □ However, the single acting plate with the
above structure (1) has the disadvantage that the internal loss is small, the resonance sharpness
is high, and the flat characteristic can not be obtained. Also, the diaphragm with the
configuration of the above (2) has a large variation in the characteristic of each molded product,
and even in one diaphragm, for example, unevenness occurs in the foam density due to the
nonuniformity of heat. There is a drawback that the variation is large. In the diaphragm
according to the configuration of (3) above, the molding cycle time when molded for high sound
as delamination for a weak bond between the resin film in the intermediate layer and the carbon
fiber and as a diaphragm for a speaker This is not so large-scale mass production, especially
when using a thermoplastic film as a binder. In addition, in the case of thinning, there is a
problem in air permeability. Further, in the diaphragm according to the above configuration (4),
there is an EndPage: 1 defect such as a difference in strength between the circumferential
direction and the radial direction of the conical diaphragm. The present invention is to provide a
speaker diaphragm having a flat characteristic such that the rigidity is modestly internal loss' t +without distortion, the distortion is small, the frequency characteristic near the high frequency
limit is improved, and the resonance sharpness is small. is there. In the present invention, as
shown in FIG. 1, for example, a cone-shaped diaphragm (1) is molded, but in the present
invention in particular, a sponge-like substance layer having air bubbles is used as an
intermediate layer (2). Arrangement J: A surface layer consisting of so-called prepregs in which
carbon fiber surface layers (31 and (4), for example carbon fiber non-woven fabric or carbon Ml
#, are arranged in a certain direction on both sides thereof is arranged at least 3 A layer structure
is formed, and at least two or more different types of polymers which co-crosslink these are
combined as a binder and compressed and molded.
The sponge-like substance as the intermediate layer (2) is constituted by a urethane sponge or
the like having open cells in which the air bubbles communicate with each other in at least a part
of the air bubbles. As the binder, two or more kinds of polymers having mutually different
specific Young's moduli and capable of co-crosslinking are used, and these co-crosslinking causes
each layer +21 + 31 + 41 to be firmly adhered.
The present invention will be described in detail during the following. EXAMPLE 1 The following
co-crosslinking binder composition is diluted with an organic solvent such as methyl ethyl ketone
on one side or both sides of a carbon fiber non-woven fabric and applied by, for example, a spray
method to form sheet-like layers (3) and (4) And punch or cut to the required size. The
application amount is 40 g / rp 2 or more, and as a carbon fiber non-woven fabric, for example, a
30 g / m 2 mat of TORECA MAT (trade name) can be used. A layer (3) of a carbon fiber nonwoven fabric coated with the composition of the co-crosslinking agent described above on both
sides of this intermediate layer (1) t using a sheet having a thickness of 4 m and using a sheet
having a thickness of 4 m And laminating (4), pressing and heating these laminates under
conditions of 160 ° C. or more and 1 OkI / crIL 2 or more, such as 170 ° C. and 10 Qkp / cm
215 minutes, heating, acid, mold, for example, corn The speaker diaphragm (1) is molded. The
diaphragm (1) thus obtained is mainly compressed by the intermediate layer (21, as shown in
FIG. 3, the cross section of which is a carbon fiber layer (31 and (41 It is laminated and
integrated. EXAMPLE 2 In the same manner as in Example 1, polyisoprene, for example LIR 30
(Kuraray), may be used as co-crosslinking agent composition instead of the polybutadiene
mentioned above for this composition. Now, a 50 g / m 2 carbon fiber non-woven fabric was
spray-coated with the co-crosslinking binder composition shown in Example 1 and punched out
to a desired size, 41 k thick urethane sponge as an intermediate layer at 170 ° C. The frequency
characteristic of the diaphragm (1) obtained by heating and pressing at 2 was as indicated by the
solid line curve in FIG. The curve shown by the broken line in the same figure shows the
characteristics of the diaphragm when one type of epoxy resin is used as a binder while forming
a compression layer of urethane as an intermediate layer between two carbon fiber non-woven
fabrics. The curve indicated by the dashed line is that of the structure of (1) mentioned at the
beginning. As is evident from these curves, EndPage: 2 shows that according to the present
invention, flat characteristics are obtained particularly at high frequencies, and improvement of
resonance sharpness is achieved. That is, according to the present invention, a binder which can
co-crosslink polymers having different specific Young's modulus mutually using two or more
kinds of binders is used as the binder by utilizing the network elastic loss of the bond-like
substance layer. As a result, the internal loss can be increased, and the internal loss and the
rigidity of the carbon fiber can be properly matched to improve the frequency characteristics.
In the above configuration, a sponge-like substance layer is used as the intermediate layer, but in
this case, for example, 9 letatan layers of this intermediate layer are in an incompletely
compressed state to increase internal loss and improve rigidity. It is desirable to keep air inside.
In the example described above, the surface layers (31 and (4) are respectively one layer, and the
intermediate layer (2) is one layer of three-layer structure, but in the case of being formed, the
multilayer structure is more than this. It can also be done.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a cross section of an example of
a speaker diaphragm according to the present invention, and FIGS. 2 and 3 are cross sectional
views of an essential part of each step of an example of the manufacturing method. FIG. 4 is a
diagram of the characteristic song a. (1) is a diaphragm according to the present invention, (2) is
an intermediate layer, and (31 and (4) are carbon fiber surface layers. EndPage: 3
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