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<Industrial Field of Application> The present invention relates to a speaker diaphragm using a
carbon cloth. <Prior Art> A carbon cloth made of carbon fibers is used. It has the characteristics
of light and strong carbon fiber as it is, and has recently been used in various applications. As an
example of its application, for example, there is a speaker diaphragm known by Japanese Patent
Publication No. 5947520 etc., and commercialization is also carried out by an audio equipment
maker. As this carbon cloth, one in which an epoxy resin is impregnated in advance is
commercially available, and it is common for a processor to purchase it and to form it into a
predetermined shape according to the application, and it is a diaphragm for a speaker In the case
of the above, it is manufactured by heating and shaping into a shape suitable as a cone-like
diaphragm or the like. <Problems to be Solved by the Invention> In the case of a carbon cloth
impregnated with an epoxy resin as described above, it takes about 45 minutes at minimum to
cure the resin during molding, so it is efficient It is difficult to proceed with the molding
operation, and it must be stored in a refrigerator to suppress the curing of the epoxy resin, and
the storage period is also limited. There are many problems that arise. Furthermore, carbon cloth
11 is rough and has high air permeability, and as it is not suitable as a speaker diaphragm, it is
necessary to take measures such as increasing the oil of epoxy resin and closing the eyes +1.1
There is also a problem that the amount tends to be large enough. The present invention focuses
on such problems and aims to provide a carbon cloth speaker diaphragm easy to manufacture. In
order to achieve the above object, in order to achieve the above-mentioned object, the speaker
diaphragm of the present invention comprises a fibrous substrate conventionally used generally
as a paper cone, that is, a pulp fiber, etc. A thermoplastic film was laminated on the surface of a
fibrous sheet made into a predetermined shape by paper forming, and further, L of this
thermoplastic film was impregnated with a phenol resin in carbon cloth and formed into a
predetermined shape. The carbon fiber substrate is superposed and heated to the melting point
of the thermoplastic film 1- to integrally bond the 1M & fiber substrate substrate fiber substrate
with the adhesive force of the thermoplastic film. <Operation> In the present invention, since a
phenol resin is used for forming the carbon cloth, the forming time is greatly reduced by> Cj.
Also, carbon fibers obtained by this molding 1.
(Problems are overlapped with the fibrous substrate, and the thermoplastic film intervenes
between the two substrates, so that the problem of air permeability is solved. Further, the fibrous
substrate and the carbon fiber substrate are heat-sealed by using the adhesive force of the
melted thermoplastic film without using an adhesive, and the bonding is easy and the
characteristic due to the variation of coated paper etc. No worries about the negative impact on
you. Next, one embodiment shown in the drawings will be described collectively. 1 is a partially
enlarged cross sectional view, FIG. 2 is a cross sectional view before bonding, (1) is a fibrous
substrate, (2) is a carbon fiber substrate, and (3) is a thermoplastic film It is. The fibrous
substrate (1) is obtained by papermaking and forming, where necessary, wool, synthetic fibers
and the like are appropriately added to the pulp fiber as a main material. This may be basically
the same as a conventional so-called paper cone, but in some cases, the thickness may be
reduced to a value smaller than one in order to keep the entire song to a predetermined value.
The carbon fiber substrate (2) is obtained by heating and molding a carbon cloth impregnated
with a thin phenolic resin into substantially the same shape as the fibrous substrate (1) in order
to be superposed on the fibrous substrate (1). is there. Although the curing temperature of the
phenol resin is higher than that of the epoxy resin, unlike the case of the epoxy resin, since the
curing time may be as short as about 10 seconds, molding is easy and the work can be carried
out extremely efficiently. It should be noted that if the amount of the phenol resin is too large,
the carbon fiber substrate (2) will be discolored and if it is less, the molding strength will be
reduced, so it is necessary to select an appropriate concentration according to the molding
conditions. As the carbon cloth to be used, the quality and density of warp and weft are the same,
and those of plain weave without directionality in length and width are desirable, and the density
of warp and weft is 400 to 1000 / m, weight 100 to 200 g / Rrt, a thickness of about 0.15 to 0.3
seems to be suitable for a speaker. Commercial products corresponding thereto are, for example,
# 6142 and # 6343 from East China Co., Ltd. As a material of the thermoplastic film (3), a
thermoplastic plastic of such a property that it does not tear at a softening temperature or
adhere to a mold when laminated on a fibrous substrate (1) is desirable, for example, nylon based
or polypropylene Etc. are suitable. The thickness of the film (3) is selected to be about 1/2 to
1710 of the fibrous substrate (1). The lamination of the thermoplastic film (3) on the fibrous
substrate (1) is carried out by the normal direct pressure method or the vacuum forming method
at the softening temperature of the film (3).
That is, in the case of blank forming, a film (3) which is sucked from the back side and stacked on
one surface side is laminated on the surface of the fibrous substrate (1) by utilizing the air
permeability of the fibrous substrate (1). FIG. 3 (a) shows this state. Next, carbon fiber group + Fj,
(2) is bonded to the surface of the fibrous substrate (1) (1) (bonded, pressed and heated to the
melting point of the thermoplastic film (3) to melt the film (3) ... Thereby, as shown in (b) of FIG.
3, a part of the film l, (3) is fused to the fiber of the surface of the fibrous group Fi, (1) to form a
fused layer (3 d) In addition, a part thereof is fused to the fibers of the back surface of the carbon
fiber substrate (2) to form a fused layer (3b). Thus, the fibrous crosspiece (1) and the carbon
fiber substrate (2) are joined via the thermoplastic film (3), and a strong diaphragm (4) in which
the front substrate is integrated is formed 2, 2 For bonding of the front substrate, a film having a
uniform thickness can be used without using an adhesive which tends to cause variation in the
coating amount, and therefore, it is effective to reduce the variation of the product. The obtained
diaphragm (4) has the same appearance as that of a carbon cross cricket, has no air permeability,
and has a suitable internal loss imparted by the fibrous substrate (1). It is easier to improve the
properties than the conventional products in which the cross is molded with epoxy resin. <Effects
of the Invention> As is apparent from the description of the above-described embodiments, in the
present invention, a carbon fiber substrate obtained by molding carbon cloth with a phenol resin
and a normal fibrous substrate are joined via a thermoplastic film. It is Therefore, since the
curing time is very long and the epoxy resin which does not use 1 to 2 for material management
is not used, the molding is easy and the molding operation can be advanced extremely efficiently,
the material management becomes easy, and the carbon cloth It is possible to obtain a
characteristically superior speaker diaphragm while having the appearance and features of
Brief description of the drawings
FIG. 1 is a partially enlarged cross-sectional view of an embodiment of the present invention.
FIG. 2 is a cross-sectional view in the middle of manufacture, and (a) and (b) of FIG. 3 are
enlarged cross-sectional views of the main part in the middle of manufacture and at the time of
completion. (1) ... fiber substrate, (2) ... carbon fiber substrate, 3) ... thermoplastic film, (4) ...
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