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■ Diaphragm for Speakers 52-39,890 Japanese Patent Application No. 46-46450 [Phase]
Application No. 46 (1971) June 25 published on April 25 48-12723 @ Sho 48 (1973) February
17 @ inventor Nakamura Yoshihiro City Oji Kamon No. 1006 Matsushita Electric Industrial Co.,
Ltd. 0 inventor Koizumi Tomon Shino City Oji Kamon 1006 Address Matsushita Electric
Industrial Co., Ltd. Toshio 1 person [phase] cited reference Japanese Patent Application No. 450791 Detailed Description of the Invention The present invention uses a mixture of a rosin resin
and a synthetic rubber latex as an internal filler, and is made by mixing it with a fiber. In general,
foam resin sheets and synthetic resin sheets have recently been used as raw materials for
speaker diaphragms, but most of them are wood pulp, li Click, at present is using animal fibers
and chemical fibers. These fibers themselves have a drawback that they can not obtain sufficient
moisture proof effect, Young's modulus, or large internal loss. [111111] Therefore,
conventionally, these fibers are mixed with a water-repellent rosin resin as an enhancer.
Although this can achieve the purpose of the first time, the moistureproof effect, Young's
modulus, tensile strength and frequency characteristics indicated by the size were not sufficiently
satisfactory. That is, the moisture-proof characteristics, Young's modulus, tensile strength, and
frequency characteristics of the diaphragm using a rosin resin as an internal filler were not
sufficient as shown by a in FIGS. 1 to 4. This is because the rosin resin is present only in the
places of the fibers, and the fibers are exposed to absorb water, and as a result, the size is not
sufficient. The present invention is intended to improve the internal filler described above to
improve the performance as a diaphragm. That is, the present invention uses a mixture of a rosin
resin and a synthetic rubber latex as an internal filler. As the rosin resin, a mixture of 5 to 15%
with respect to the weight ratio of fibers, and 5 to 15 of synthetic rubber latex is used. That is,
the rosin resin solid content in a weight ratio of 5 to 15 is dissolved in water with respect to the
fiber 100 such as pulp, and the synthetic rubber latex solid content 3 to 15 is dissolved in water
to be golded. Ten aqueous solutions of alum are added to form a material, which is formed into a
diaphragm by a general papermaking method, wet press, and dry drying method. A diaphragm
made of a material having such a composition has a film of synthetic rubber latex containing
rosin resin formed on the surface of the fiber, and the fiber is completely covered, as shown by b
in FIGS. The moisture resistance (size), Young's modulus, tensile strength, frequency
characteristics are all improved.
That is, FIG. 1 shows a size characteristic showing hygroscopicity, and the characteristic of the
present invention is that as the amount of the rosin resin and the synthetic rubber latex
increases, the degree of covering the fiber becomes closer and the characteristic improves. The
Young's [111111] EndPage: 1 ratio in FIG. 2 is a mixture of 15 each of a rosin resin and a
synthetic rubber latex, and the Young's modulus possessed by the synthetic rubber latex is most
effectively exhibited and rapidly improved. Also in the tensile properties shown in FIG. 3, the
adhesive bond by the synthetic rubber latex between the fibers is sufficiently made in 15 cases
each, which is the highest. In FIGS. 1 to 3, the contents of the rosin resin and the synthetic rubber
latex are 5% if they are related to five, and 10% if they are 10%. In addition, the content of these
is limited to 5 to 15 depending on 5 or less respectively, the effect of containing the rosin resin
and the synthetic rubber latex hardly appears remarkably, and those whose property is degraded
on 15 or more In particular, the specific gravity of the synthetic rubber latex itself is large, and
fibers are interspersed in the synthetic rubber latex, so that the properties of the fiber are
completely lost [111111]. Also in the frequency characteristics, the diaphragm is required Of the
three factors of low density, high Young's modulus and high internal loss, Young's modulus is
synthetic rubber latex, internal loss is fiber, and density is obtained under molding conditions, as
shown in FIG. As you can see, there is almost no distortion near the high frequency and it is
stable. In FIG. 4, a2 is the second harmonic characteristic of the conventional product, a3 is the
third harmonic characteristic, b2 is the second harmonic characteristic of the present invention,
and b3 is the third harmonic characteristic. It shows. Thus, the speaker diaphragm of the present
invention can improve various characteristics, and can be a dog of industrial value.
Brief Descriptions of the Drawings are characteristic comparison diagrams of the speaker
diaphragm of the present invention and the conventional speaker diaphragm, and FIG. 1 is a
moistureproof characteristic diagram, FIG. 2 is a Young's modulus characteristic diagram, and
FIG. The tensile strength characteristic diagram, FIG. 4 is a frequency characteristic diagram.
[111111]EndPage: 2
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