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JPS5119522

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DESCRIPTION JPS5119522
C2, ooooPl) + patent application 4′1 year? March 7 address Tokyo Metropolitan area Iku-ku
Aobadai 6-chome 17 4. Attached crockery list ■ Japan Patent Office ■ JPA 5 l-495 2264-f; / C.
Hc) 4F? , 31 / DO specification 1, title of the invention
Acoustic diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention relates to an acoustic diaphragm
using metal plated fibers and a method of manufacturing the same. Among various physical
properties required for the acoustic diaphragm, among them, there are a large Young's modulus,
a large propagation velocity of longitudinal waves, and a moderately large internal loss. However,
it is a contradictory requirement that the large Young's modulus and propagation speed and the
large internal loss are contradictory requirements, and it is extremely difficult to satisfy both at
the same time. It has For example, a composite cone of a large internal loss corn material and a
metal foil with a large Young's modulus, a multi-layered pulp with a large internal loss pulp and a
fiber with a high Young's modulus, a synthetic resin, rubber, etc. In addition, the surface of the
table is glued with a high-velocity inorganic material, and the surface is too numerous to count.
However, even in the conventional method, there is a disadvantage individually, for example, in
the case of a laminated cone, it is necessary to use an adhesive, and the adhesive applied to the
entire surface of the cone is used only to a cone material having a large internal loss. The
adhesive itself, which penetrated in 1 and lost its intended purpose, resulted in deterioration of
the sound quality. Moreover, in the multi-layer corn, although the obstacle by the adhesive is
removed, it is not possible to squeeze the one having a high propagation speed of metal like on
the front and back of the cone EndPage: 1 using the existing multilayer grinding technique. Even
if sufficient attention is paid to the beating of wood pulp etc., there is a limit. In the impregnation
method, it is difficult to adjust the deterioration of sound quality and Young i and internal loss
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due to the influence of the impregnating agent. In the case, the weight is large and the range of
use is narrow. The present invention solves the above-mentioned conventional defects and
obtains the required physical properties without using any adhesive impregnant that interferes
with the sound quality, and further using a more specific technique of multi-layer production. It
is an object of the present invention to provide a diaphragm for a wide range of applications
having the required physical properties and sound quality.
Acoustic diaphragm and method of manufacturing the same
Hereinafter, the present invention will be described in detail. The method of metal plating on the
surface of a natural fiber or synthetic fiber is well known, and in the metal plated fiber, metal
particles 2 cover the surface of the fiber 1 as shown in the figure. Therefore, such gold plated
fibers do not impair the internal loss of the fibers themselves, and the metal particles 2 are firmly
adhered to the surface of the fibers 1, and the metal particles are continuously deposited. So you
can get a big propagation speed. The diaphragm is not merely required to have a large Young's
modulus, but must be adjusted in relation to internal loss. In this case, in the case of using the
above gold or metal plated fiber, it can be freely set by adjusting the plating amount. For
example, in the plating process, the density of the degree of plating can be freely controlled by
activating the fiber, adjusting the plating solution, or the like. In addition, it is possible to adjust
the propagation speed by appropriately selecting the plating material as Ou, N], Zn or the like.
There are two forms in the case of using the above-mentioned metal plated fiber as a diaphragm
material. That is, there are a form in which metal plated fibers are mixed with other wood fibers
and the like to make a sheet, and a form in which a sheet is made only with the metal plated
fibers. For the purpose of the present invention, any form may be used, and any desired effects
can be obtained. In the case of the former, it can be said that the conventional method of mixing
different materials such as wool, rayon, etc. into wood fibers can be performed in exactly the
same manner, but as in the latter case, In this case, the strength is relatively low, and in some
cases, sufficient strength as a diaphragm can not be obtained. However, since the metal particles
plated as described above are in intimate contact with the surface of the fiber very firmly, even if
the same beating is carried out when removing paper, peeling of the plating is minimal, so the
advantages of metal plating are as follows. The beating process can be carried out without any
reduction in the thickness, so that it is possible to obtain a diaphragm having sufficient strength
even with metal plated fibers alone. There are a press type and a non-press type for the forming
process after the paper making, and the forming according to the purpose is performed
respectively. According to the acoustic diaphragm of the present invention, the metal plated fiber
of the material is that the metal particles cover the fiber surface and damage the internal loss of
the fiber itself, the metal particles are continuous on the fiber surface Since it is deposited and
firmly adhered, it is possible to obtain a diaphragm that has a large blow rate and propagation
speed. Further, Young's modulus, propagation speed and internal loss can be appropriately
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adjusted by appropriately selecting the plating amount of the metal plating fiber and the plating
material, and there is an advantage that a diaphragm having a wide application can be provided.
4 Brief Description of the Drawings The drawing is an enlarged view schematically showing a
metal plating fiber incorporated as a material of the acoustic diaphragm of the present invention,
in which 1 indicates fibers and 2 indicates metal particles. EndPage: 2
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