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JPS58111600

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DESCRIPTION JPS58111600
[0001]
The present invention relates to an acoustic diaphragm used for speakers, etc. The purpose of the
invention is to use inorganic short fibers having a high propagation speed on the basis of
polyolefin plastic with high internal loss. By blending, it is to realize an ideal one as an acoustic
diaphragm, that is, one having a large internal loss and a high propagation speed. Conventionally,
an acoustic diaphragm mainly composed of polypropylene (see% JP 55-46112) and an acoustic
diaphragm mainly composed of 4-methylpentene (see JP 53-45226), etc. are provided. ,ing.
Although these conventional examples have large internal loss, they have a slow propagation
speed and a small strength, so they have the disadvantage that the acoustic characteristics
(frequency characteristics) of the speaker using this acoustic diaphragm are not smooth. The The
present invention is to provide an acoustic diaphragm having a density of 0, 93 Pr / ell or more,
in which inorganic short fibers are arranged in a material mainly made of polyolefin plastic, in
order to eliminate the problems as described above. Chiru. Among mineral fibers, potassium
titanate-fibers. Because it is the thinnest and shortest, its dispersion with plastic is homogeneous
and its bond is strong compared to other carbon fibers and glass fibers. Hereinafter, the actual
voice of the acoustic diaphragm of the present invention will be described. EXAMPLE 1
Polypropylene is blended with about 20% of polyethylene as a polyolefin plastic, 5 to 30% of
potassium titanate fiber is blended as inorganic fiber, and the mixture is hot-melt mixed to form a
sheet. This is molded into an acoustic diaphragm shape by vacuum molding or pressure molding
using a molding die. EXAMPLE 2 5 to 30% of potassium titanate fiber as an inorganic fiber is
blended with 4-methylpentene-l polymer as a ポ リ オ レ フ ィ ン polyolefin-based plastic, and
the mixture is heat-melt mixed to form a sheet. This is heat-pressed using a molding die to form
an acoustic diaphragm. Further, the effect of the physical properties of the acoustic diaphragm
plate processed and processed as in Example 1 was as shown in Table 1. As shown in Table 1
Table 1, the propagation speed increases approximately twice, and the decrease in internal loss is
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small. In addition, even in the case of the acoustic diaphragm plate-shaped and processed as in
Example 2, the same tendency is obtained. Further, the effects of the heat-resistant surface of the
acoustic diaphragm plate formed and processed as in the above-mentioned embodiment are as
shown in Table 2. As shown in Table 2 Table 1 improves heat resistance by about 2 Or.
Furthermore, the sound pressure frequency characteristic of the speaker using this acoustic
diaphragm is, as shown in the attached drawing, for example, the invention of forming and
processing 10% of the titanium floor kaurisu fiber as an inorganic fiber in the first embodiment.
It can be seen that the sound pressure frequency characteristic A of the speaker using the
acoustic diaphragm is smoother than that of the sound pressure frequency characteristic B of the
conventional speaker, and the frequency characteristic is improved.
[0002]
Brief description of the drawings
[0003]
The attached drawings compare and show the sound pressure frequency characteristics of a
speaker using the acoustic diaphragm of the present invention and a conventional speaker.
A: Sound pressure same wave number characteristic of the speaker using the acoustic diaphragm
of the present invention, B: Sound pressure frequency characteristic of the conventional speaker.
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