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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various acoustic devices. PRIOR ART Natural pulp is used as the
material of conventional speaker diaphragms. Metal materials such as aluminum and titanium,
and polymer materials such as plastic films have been used. Problems to be solved by the
invention However, the diaphragm obtained from natural pulp is weak in rigidity, and
particularly when a pigment is used for dyeing, the high frequency limit reproduction frequency
band is narrow due to the reduction in rigidity, and division vibration occurs, etc. There is a
drawback. In addition, metal materials are high in material cost, the degree of freedom in shape
is limited, and deep drawing is very difficult. Furthermore, polymer materials such as plastic films
are inferior in rigidity, and have problems such as poor heat resistance and poor adhesion. The
present invention is intended to provide a speaker diaphragm that can solve this problem. Means
for solving the problem In order to solve this problem, the present invention mixes a 30 to 2 o ○
mesh sheet of graphite flake having a flat shape into pulp fiber, and uses epoxy resin or
acrylamide. It is intended to fix as a binder in a beater with a resin of the system, and to
construct a speaker diaphragm by post-papermaking and forming processing. A fine graphite
flake having a flat shape is mixed with a working natural pulp, and a cationic epoxy resin, that is,
a polyamido-shrimp chlorohydrin resin is used as a binder to form and process in a paper
making process. At this time, the graphite and flakes intrude between the natural valve fibers and
serve to improve the rigidity. EXAMPLE A loudspeaker diaphragm in an example of the present
invention will be described below. Natural pulp is beaten, and to this, about 20% (wt%) of fine
scale-like flaky graphite separated to a size of 60 to 300 mesh is added. Add 2% of colored film
and ketene dimer acid (size agent) with dye, add 3% (wt%) of epoxy polyamide epichlorohydrin
resin as binder, adjust to pH = 4 with aluminum sulfate and fix After this, a diaphragm is obtained
by papermaking. The comparison of the physical property values of the diaphragm of the present
invention and the conventional diaphragm is shown in the following table. The conventional
product is 100% natural pulp and has a freeness of 20 'SR, and the binder and sizing agent have
the same specifications as the product of the present invention. The diaphragm according to the
present invention has high rigidity and good physical properties as shown in the table. FIG. 1
shows the f characteristic of a speaker using the diaphragm of the present invention. It can be
seen that the sound quality has better results with superior characteristics of the upper limit
frequency compared to the conventional product B.
FIG. 2 is a cross-sectional view of essential parts of a diaphragm according to an embodiment of
the present invention. In the figure, ■ is a natural pulp fiber, and ■ is a graphite flake. Effects of
the Invention As described above, the diaphragm of the present invention is configured, so that a
diaphragm having high rigidity and high physical property values required as a diaphragm of a
speaker can be easily manufactured by a conventional method, and flat F It is possible to provide
good high quality sound with high frequency band limit frequency having characteristics, and is
of great industrial value.
Brief description of the drawings
FIG. 1 is a sound pressure frequency characteristic (F characteristic) of a speaker using a
conventional imaging plate and the diaphragm of the present invention, and FIG. 2 is a crosssectional view of essential parts of the diaphragm of the present invention.
1 ...... natural valve fibers, 2 ...... scale graphite.
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