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The diaphragm for the electro-acoustic transducer The diaphragm for the electro-acoustic
transducer includes the light metal mesh as an intermediate layer, the fiber sheet being adhered
and combined on both sides of the metal sheet.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for
an electro-acoustic transducer. In this type of diaphragm, for example, a diaphragm for a speaker,
as shown in FIG. 1, a honeycomb core (1) made of, for example, aluminum foil is provided as
shown in FIG. For example, there is a so-called "one nick" diaphragm in which surface layers (2)
and (3) made of aluminum foil are bonded with an adhesive (4). Although this two-cam
diaphragm exhibits high rigidity, the manufacture of the one-Nickam core (1) is complicated. In
addition, the process of bonding the surface layers (2) and (3) of aluminum foil to the core (1)
with an adhesive is complicated, and it is difficult to mold any shape such as a cone. There is a
drawback. In the present invention, it is possible to avoid these five disadvantages, and for an
electro-acoustic transducer that is high in rigidity, light in weight, can reduce the resonance
acuity, and can improve high frequency characteristics. It provides a diaphragm.
Detailed description of the present invention will be made with reference to FIG. 3. In the present
invention, an intermediate layer (5) made of a metal mesh made of a light metal such as
aluminum or aluminum alloy is provided and a polymer adhesive such as epoxy is provided. A
fiber sheet impregnated with a mixture of epoxy resin and an epoxy-modified butadiene, for
example, fiber sheets (6) and (7) made of carbon non-woven fabric or woven fabric is provided,
and this impregnated adhesive is uncured or semi-cured both sheets (6) 7) is applied to both
sides of the intermediate layer (5) and pressed with a die of 170C to 180C to bond and combine
the sheets (6) and (7) with the intermediate layer (5), for example, in a cone-like arbitrary shape
To mold. The metal mesh as the intermediate layer (5) is made of, for example, an expanded
metal of an aluminum plate, or a perforated plate such as a pan EndPage: 1 metal, or a net. The
fiber sheets (6) and (7) may be made of, for example, a carbon fiber non-woven fabric having a
thickness of 0.1 w, and for example an aluminum perforated plate as the intermediate layer (5)
has a thickness of 0.3 It can be selected to about -0.8-. As the adhesive for laminating and
combining each layer (5), (6) and (7), it is desirable to use an adhesive composed of two or more
different kinds of co-crosslinking polymers, but 1 m of thermosetting adhesive, for example, An
epoxy type, a radical polymerization reaction type, a urethane type etc. can also be used. For
example, 9.6 parts by weight of an epoxy adhesive may be used, and as another example, or may
be used. Moreover, as an adhesive agent of a radical polymerization type ¦ system ¦ group, and as
another example, as an adhesive agent by a urethane bond, 10 weight part can be used. As a cocrosslinking agent (adhesive), may be used. Furthermore, as another example of the cocrosslinking agent composition, may be used. In addition, polyisoprene, for example, trade name;
LIR30 (manufactured by Kuraray Co., Ltd.) may be used instead of the above-described
polybutadiene in this composition. The above-mentioned binder is diluted, for example, with the
solvent to impregnate the carbon fiber non-woven sheets (6) and (7). Then, an intermediate layer
(5) made of a light metal mesh is drawn between the sheets (6) and (7), and the air layer (11 is
left in the mesh as described above by pressing with a mold, heat molding) Do. In this case, as
described above, when the thickness is selected as about 0.3 to 0.8 m as the metal mesh (5), the
adhesive combination of the sheets (6) and (7) and the intermediate layer (5) At the same time,
for example, cone-like molding as a speaker diaphragm can be simultaneously performed by
pressure heating and molding using a metal mold.
EndPage: 2 Furthermore, as described above, when it is composed of two or more polymers
different in specific Young's modulus and capable of being cross-linked as described above, the
effect of increasing the internal loss due to the co-crosslinking is described. In addition, the
internal loss can be properly matched with the carbon fiber sheet (6) and the rigidity due to the
force, and the resonance sharpness can be flattened to improve the characteristics in the high
frequency range. As described above, in the configuration of the present invention, since the
intermediate layer (5) made of light metal mesh is provided, it is possible to obtain a diaphragm
having a high rigidity. And this mesh can be easily manufactured, for example by perforation of
an aluminum plate. Further, the joining of the sheets (6) and (7) of the surface to the
intermediate layer (5) can be performed simultaneously with, for example, a cone-like molding by
impregnating the sheets (6) and (7) with an adhesive resin. Because there is no trouble of joining.
Further, in the diaphragm according to the present invention, since a cone shape etc. can be
formed, the freedom of the shape is increased. Further, according to the present invention, since
the surface layer is constituted by a fiber sheet, The intermediate layer (5) can be firmly joined,
and accordingly, the amount of adhesive used can be reduced compared to the prior art, and the
weight of the diaphragm can be reduced, and hence the vibration efficiency can be improved. it
can. In the example described above, the fiber sheets on both sides are each one layer, but
various changes can be made, such as two or more layers.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a honeycomb core of a
conventional honeycomb diaphragm, FIG. 2 is a sectional view of a conventional diaphragm, and
FIG. 3 is a sectional view of an example of a diaphragm according to the present invention. (5) is
an intermediate layer, (6) and (The force is a fiber sheet. EndPage: 3