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Description 1, title of the invention
Speaker diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention aims to provide a low density,
lightweight, high specific elastic modulus, high internal loss speaker diaphragm. Conventionally,
a large amount of paper is used for the speaker diaphragm, which is because paper appropriately
satisfies the light weight, high specific elastic modulus, and high internal loss required of the
diaphragm. In recent years, diaphragms made of polymer materials and metal materials have
been used, but there are few materials that simultaneously satisfy both of the specific elastic
modulus and the internal loss. The metallic material has a small internal loss and sharp edge
resonance, and the polymeric material has a large internal loss but a low specific elastic modulus
and a defect EndPage: 13 in which the high frequency limit frequency can be suppressed. In the
present invention, in order to satisfy the above-mentioned physical properties, a large amount of
air layer can be contained in the base material by using a thermoplastic synthetic pulp as a
polymer material and taking a paper-making process to make it possible to reduce its weight. By
heating A, the synthetic pulp was filmed to confine the air layer as closed cells and to improve
the elastic modulus. At this time, the micro hollow body is mixed to increase the sheet thickness
and the elastic modulus is increased. The internal loss of the polymer itself is high, and it shows a
value of a paper plate or more even after the micro hollow body is mixed. In addition, boron fiber
and glass fiber as a reinforcing material. By incorporating fibers such as aramid fibers, acrylic
fibers and natural fibers, an increase in elastic modulus is further observed. The micro hollow
body in the present invention refers to a glass micro hollow body, a carbon micro hollow body, a
silica based micro hollow body and the like. In addition, the content range determined the
optimal range from molding processability specific elasticity modulus and internal loss so that it
might mention later. The thermoplastic synthetic valve is a valve obtained by fibrillating a resin
such as polyethylene, polypropylene and polymethylpentene (TPX) and subjected to a
hydrophilic treatment. Examples will be described below. Example 1 20 wt qb of high density
polyethylene synthetic pulp (80 wt% L reinforcement, carbon micro hollow body (average
particle diameter 1 o 6 μm, particle specific gravity 0.2 to 0.3) as a base material mixed with 20
wt qb) Machine density 12 o! //rr? Paper making. Next, this paper-made sheet was heated
to a temperature above the melting point by far infrared radiation, and when the sheet was
softened, cold press forming was performed to obtain a diaphragm for a speaker. 0 Various
physical characteristics of the obtained diaphragm for a speaker were measured. It shows in the
table. Example 2 7.0 wt% of the same substrate as in Example 1, 1 owt% of carbon micro hollow
body as a reinforcing material, carbon fiber (6 fiber length, 10 μm fiber diameter) '+ O wt%,
aramid fiber (trade name KEPLER) 49, fiber length 2 m) 1 owt was mixed, and a speaker
diaphragm was obtained in the same manner as in Example 1.
As is apparent from the above table, the internal loss is sufficiently high in Examples 1 and 2 and
the density is also sufficiently light at paper level. In addition, the specific elastic modulus can be
made much higher than that of paper, and the mixing of micro hollow bodies is effective, and if
fibers are mixed as in Example 2, the specific elastic modulus can be further improved 75; f 'l J
ru. Next, the size and the like of the micro hollow body will be described. In the above example,
the particle diameter is selected as 1ooμ up to 75f300μ for practical use 0 This is 300μ, · · · · ·
· · j + · + + / ear 1 λ PI fl as it appears uneven on the surface of the diaphragm Therefore, the
particle diameter is preferably 300 μm or less. The specific gravity of the hollow hollow body is
preferably in the range of 0.16 to 0.4. If the specific gravity is less than 0.15, a large amount
floats on the suspension during papermaking, that is, the dispersibility deteriorates, while if the
specific gravity is greater than 0.4, the specific elastic modulus is increased. It will not be
possible. Further, the content of the micro hollow body is measured using the same material as in
Example 1 and the results will be described with reference to the drawings. If the content is less
than 5 wt 4, the specific modulus is extremely reduced, which is not preferable. On the other
hand, if it exceeds 4 owt%, the internal loss will be low, and the moldability will also be worse, so
6 to 4 owtl is a practical and characteristic range. As apparent from the above, according to the
present invention, it is possible to obtain a lightweight, low density speaker diaphragm having a
high specific elastic modulus, a high internal loss, and a wide dynamic range using this. Provide a
speaker that achieves low distortion, flat frequency characteristics and high efficiency. ものであ
る。 EndPage: 2
4. Brief description of the drawings The drawing is a curve diagram showing the measurement
results of the specific elastic modulus and the internal loss with respect to the content of the
micro hollow body. Name of agent Attorney Nakao Toshio 1 other friend fine ho hollow body
book blue check (-2) EndPage: 3
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