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JPS5755695

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DESCRIPTION JPS5755695
Title of the Invention Method of manufacturing acoustic parts using polyoxymethylene whiskers
Thermoplastic fibers and polyoxymethylene whiskers are mixed and formed into a sheet, and the
above-described sheet-formed body is at a temperature lower than the softening point of
polyoxymethylene. A method of manufacturing an acoustic component using polyoxymethylene
whiskers, characterized in that a thermoplastic fiber is melted and formed in a bath.
Claims
DETAILED DESCRIPTION OF THE INVENTION In general, the first condition of physical
properties required for acoustic components such as speakers, head phones, diaphragms such as
microphones, head shells of cartridges, tone arms of cartridges, cantilevers of cartridges, cabinets
of speakers is Young's modulus It is high. With Young's modulus or ugly, for example, in the
diaphragm it is possible to drive the movement to a high frequency. Recently, attempts have been
made to use carbon fibers, alumina fibers, etc. in order to increase the Young's modulus, but
when carbon fibers or alumina fibers are used as a binder, for example, thermoplastic fibers such
as polyethylene are used, they are wetted with this binder. The acoustic parts produced thereby
are extremely fragile, and their strength is low. In addition, they have the disadvantage that they
can not fully exhibit the good physical properties possessed by this carbon fiber and alumina
fiber. Polyoxome 11- \ Tylene single crystal whiskers obtained by the method developed by the
Institute of Industrial Technology, Industrial Technology Institute of the Ministry of Industry,
Trade and Industry, have a Young's modulus or approximately 1X10 age and are as large as
carbon fibers. The oxymethylene fraction crystal whiskers should be well wetted with a
thermoplastic fiber binder such as polyethylene. Further, since this polyoxymethylene whisker
has a shape in which an infinite number of needles project from one point into one shot, there is
no directivity in all physical characteristics of the composite with polyethylene or the like. The
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present invention relates to a process for producing acoustic components coated with
polyoxymethylene whiskers to be applied, in particular for the polyoxymethylene whiskers? ! I
Reasonable characteristics are designed to be able to fully generate EndPage: 1. Hereinafter, an
example in which a method of manufacturing an acoustic component using whiskers of
polyoxymethylene of the present invention is applied to a method of manufacturing a diaphragm
of a speaker will be described with reference to the drawings. In this example, as shown in FIG. 1,
prepare a container (1) of a predetermined shape whose bottom surface (la) is formed in a
reticulated shape, provide the tit2 on the bottom surface of the container (1), and A
predetermined amount of water (3) is injected into (1), and whiskers (4) of polyoxymethylene
and a synthetic polyethylene pulp (5) at a weight ratio of 50% are put in the water (3).
Thereafter, the water (3) is stirred to mix the polyoxymethylene whiskers (4) and the
polyethylene-based synthetic pulp (5), and then, as shown in FIG. 2, on the paper surface (1a) of
the container tl). The lid (2) provided is removed, and water (3) is removed through the mesh of
the bottom surface (1a) to make a sheet. In this case, a paper-made sheet (6) is obtained in which
whiskers (4) of polyoxymethylate / polyethylene-based synthetic pulp (5) are mixed on the
bottom surface (la) of the container (1).
This paper-made sheet (6) is formed by a heat press compression molding machine (7) to form a
diaphragm of a speaker. In this case, the temperature of the hot press compression molding
machine (7) is a temperature at which polyethylene-based synthetic pulp (the temperature at
which Flu melts and the whiskers (4) of polyoxymethylene do not soften), that is, the softening
point of whiskers (4) Is 180C to 190C, so the temperature at which the polyethylene-based
synthetic pulp (5) melts below this temperature, for example, 130C to 150t: '. The diaphragm of
the speaker manufactured according to this example is obtained by melting and bonding a
polyethylene-based synthetic pulp (5) as a binder with polyoxymethylene whiskers 14) as a
binder, i.e. It contains whiskers of methylene. The physical properties of the diaphragm were
measured by the vibration lead method. The results are as follows. Resonance sharpness (Q) 21.0
Young's modulus (N / rr, 2) 3.5 × 10 g Density (kg, / m3) 850 Longitudinal wave velocity (m, z,)
2030 In contrast to this -L general vibration The characteristics of the diaphragm made of
polyethylene-based synthetic pulp, which is the material of the plate, are as follows. Resonance
sharpness (Q) 16. . Young's modulus (NAm 勺 1.6 × 109 density (kg / rn3) 900 longitudinal
wave propagation velocity (r / s 133 ° for comparison) The diaphragm manufactured according
to the present invention has an acoustic characteristic of resonance sharpness Q Although it is
somewhat inferior, it has been credited and improved in other respects. In particular, the Young's
modulus is more than doubled, a reinforced diaphragm can be obtained, and the longitudinal
wave temporary attachment speed is also improved to a large wheel. Moreover, the whiskers of
this poly (o-quine methylene) can be superior to a strong diaphragm which is very wet with
polyethylene synthetic pulp, and can fully exhibit the good physical properties possessed by the
polyoxymethylene whiskers. Furthermore, since this polyoxymethylene whisker has a shape in
which a large number of needles protrude in a single point or b, it is advantageous as an acoustic
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characteristic regardless of the object jjl characteristic of the composite. In the above
embodiment, the papermaking sheet (6) is directly heat-bleached, but this papermaking sheet (6)
is shown in FIG. This film (6) may be formed into a diaphragm shape by a pressure forming
machine (9) as shown in FIG. Also in this case, it can be easily understood that the same effects
as described above can be obtained. In addition, the mixing ratio of polyoxymethylene whiskers
and polyethylene-based synthetic pulp is about, but when the content of polyethylene-based
synthetic pulp as a binder is less than 30 weight ratio, the strength of parts can not be
maintained. The polyoxymethylene whiskers have a weight ratio of 30 or more, and when the
polyoxymethylene whiskers are less than 10 times by weight, the good physical properties
possessed by the polyoxymethylene whiskers do not significantly appear. The proportion is
preferably 10% by weight or more.
R ウ ィ ス カ polyoxymethylene whiskers were in the range of 10 to 70 M1, polyethylene
synthetic pulp was effective in the range of 0 9 o to 30 iJ [1% ratio or M. In the above
embodiment, although an example of manufacturing the EndPage: 2 diaphragm of the speaker
according to the present invention has been described, according to the present invention, since
the acoustic characteristics are superior as described above, the diaphragm of the speaker is
used. The present invention can be applied to a method of manufacturing acoustic components
such as a microphone, a diaphragm of head 7 on, a cartridge shell shell, a tone arm, a cartridge
cantilever and a speaker cabinet. Although polyethylene synthetic pulp is used in the above
embodiment, it can be easily understood that thermoplastic woven fabric such as polyethylene
fiber, polypropylene fiber, polyacrylonitrile fiber, etc. can be used instead. In the above-described
embodiment, the sheet is formed by the wet process, but it is needless to say that the sheet may
be formed by the dry process instead. The present invention is of course limited to the abovedescribed embodiment, and various other configurations can of course be taken without
departing from the scope of the present invention.
Brief Description of the Drawings Figures 1, 2 & flit! FIG. 3 is a diagram for describing one
embodiment of a method of manufacturing an acoustic component using whiskers of the present
invention, and FIG. 4 and FIG. 5 are respectively provided for the description of another
embodiment of the present invention. FIG. (4) is a polyoxymethylene whisker, (5) is a
polyethylene-based synthetic pulp, (6) is a paper-made sheet, (The force is a heat press
compression molding machine. Figure 1 Figure 3 3 2 rlA Winter 5 Figure EndPage: 3
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