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JPS5853298

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DESCRIPTION JPS5853298
[0001]
The present invention relates to a diaphragm for acoustic equipment and a method of
manufacturing the same. More particularly, the present invention relates to a diaphragm
(hereinafter referred to as a diaphragm) used for an audio device such as a speaker or a
microphone, and a method of manufacturing the diaphragm. As the vibrating plate as described
above, for example, one having a size of, for example, polyethylene dimension, in which short
fibers of carbon edge M11- are dispersed in polypropylene, is known. However, such a
conventional diaphragm has a defect that it is inferior in heat resistance and low in efficiency.
That is, since polyethylene has a melting point of about 138 ° C. and polypropylene has a
relatively low temperature of about 176 ° C., the specific elastic modulus is lowered even if the
temperature rises slightly, and 9 high sound reproduction limit frequency, reproduction, The
sound pressure level of the frequency characteristic, particularly in the high-pitched sound
region, drops and sinks. This phenomenon is caused by the large heat generation of the voice
coil, and the connection between the voice coil and the diaphragm may reach a high temperature
of 200 ° C or higher. Such as high-input speakers, car stereos, car radios, etc. It is particularly
remarkable in the case where it is apt to cause a temperature rise due to 1) sunlight, such as a
speaker such as an audio equipment for use or a portable radio used outdoors. 1, polyethylene
has a specific gravity of about 095, and that of polypropylene is still relatively high at about 091,
so it is not so suitable as a diaphragm material that needs to reduce its weight as much as
possible to improve its efficiency, Is hoped for. 2- The object of the present invention is to solve
the above-mentioned drawbacks of the conventional diaphragm and to provide a diaphragm
having high heat resistance and high efficiency, and a method of manufacturing the same. In the
present invention 9 to achieve the above object. There is provided a diaphragm for an audio
device, characterized in that high-elasticity fiber short fibers are substantially uniformly
dispersed in poly 4-methylpentene-1. It's small. In the present invention, as a method of
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1
manufacturing the above-mentioned diaphragm, a pulp made of poly 4-methylpentene-1 and
having a specific surface area of 3 m '/ g or more "2 and a short fiber of high elastic fiber are
mixed. A method for producing a diaphragm for an acoustic device is provided, which comprises
heating a sheet-like material obtained by paper-making and shaping it into a desired shape. The
diaphragm of the present invention and the method of manufacturing the same will be described
in detail in the manufacturing process. After all, poly 4-methylpentene-1 is prepared in the form
of pulp. That is, a stock solution comprising poly-4-methylpentene-1, an appropriate organic
solvent and water is prepared, and the stock solution is spun into a fibrous form using a wellknown method such as emulsion flash spinning, and further beaten It is pulp.
Such a pulp preferably has an average length of about 0.1 to 10 mm (mm), more preferably
about 05 to 5 (mm), but its specific surface area is well dispersed in water in the paper forming
process described later As you get sex and get 9 strong sheets. It is necessary to be 3 m '/ g or
more ", more preferably 5 m' / g or more. The size is preferably 08F (Canadian Standard
Freeness) or less. "Dispersed in water in duplicate" is polyvinyl alcohol of 01-10 (wt%), preferably
05-5 (wt%) on the surface and / or still inside the pulp. This is further improved when
hydrophilic polymers such as modified starch and polyacrylamide, and surfactants such as vinyl
maleate copolymer alkali metal salt are contained. In order to obtain such a liquid, it is preferable
that the above-mentioned stock solution contains the above-mentioned hydrophilic polymer,
surfactant and the like in the range of two. Meanwhile, short fibers of high elastic fiber are
prepared. Such short fibers are most preferably carbon fibers having high strength, high
elasticity and low specific gravity, but glass fibers, aramid fibers, aromatic polyamide fibers,
polyester fibers, polyacrylonitrile fibers, polysulfone fibers, It is also possible to use fibers such
as polyether fibers, silicon carbide fibers 9 metal fibers, cellulose fibers, cellulose acetate fibers
and the like. Because carbon fiber has conductivity, though. When the content is high, the
diaphragm itself becomes conductive, which is not suitable for the type in which the voice coil
lead terminal is provided on the diaphragm. In some cases, carbon fibers and other insulating
fibers such as glass fibers and aramid fibers may be used together. The average length of the
short fibers as described above is about 0.5 to 20 (dish), and the average diameter of the short
fibers is 1.501 L or less, preferably 2 Q lt or less. Next, put the above pulp and short fibers in a
suitable aqueous solution with a water dropper ": <mixture to a slurry form. Since the specific
surface area of the pulp is 3 m '/ g or more as described above, the mixing in-causes the pulp to
be dispersed 5-very uniformly in water. By this dispersion, the pulp gets into between the short
fibers, and as a result, a mixed solution in which the pulp and the short edge & f are uniformly
mixed is obtained. Percentage of pulp and staple fibers dispersed in water. That is, what
proportion of pulp and staple fibers should be added to water "is determined in consideration of
the proportion of staple fibers in the finally obtained diaphragm.
The proportion of short fibers in the diaphragm depends on the type of short fibers, but it is
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2
usually 1 to 50 (weight related). Preferably, it is about 5 to 60 (weight related). After all, the ratio
of the pulp to the short fiber is 95 = 5 to 50:50. Good luck is 95: 5-7 o: 60. Next, the above
mixture in the form of slurry is formed into a sheet by a known wet sheet forming method, for
example, a method using a sheet machine to obtain a wet sheet. Next, the sheet is dried with hot
air at about ° C to obtain a dry sheet. However, this dry heat treatment is not always necessary.
In this way, the obtained dried and heat-discharged sheet is subjected to 9 well-known forming
methods such as mold forming method and vacuum forming method ": desired diaphragm shape
under heating. That is, it forms in flat form, cone shape, dome shape etc. The heating
temperature d at this time, the softening temperature of the pulp. That is, it is C) about 200 to
650 higher than the softening temperature of poly 4-methylpentene-1. The molding pressure
may be very low. By the above-mentioned molding, it is possible to obtain the diaphragm of the
present invention in which the short fibers of high elastic fiber are dispersed substantially
uniformly in poly 4-methylpentene-1. In fact, the fact that short fibers are substantially uniformly
dispersed means that even if there is a cohesive bundle of short fibers in poly 4-methylpentene-1,
it is almost 10 in the same direction. , And preferably 5 or less short fibers are collected, and the
proportion of Icocohesive bundles in the noon counts the total number of short fibers, counting it
as one short fiber in the case of aggregated bundles. % Or less. In the above-mentioned forming
process, it is preferable to prevent the pulp from completely melting and squeezing, and even if
the pulp is melted, the melted pulp is held at the intersection of the short-edge silks, etc. It is
good to keep it in the filling condition. これは。 This can be achieved by appropriately selecting
the forming pressure and the forming time, but by doing this, the diaphragm has a so-called
pomahus structure with a porosity of about 5 to 70 (%) and 9 bending rigidity is increased,
Harmonic distortion is reduced and the reproduction limit frequency is increased. Good effects
can be obtained as a diaphragm. As described above, the ninth invention of the present invention
uses poly 4-methylpentene-1 and has a specific surface area of 6 m '/ g or more and short fibers
of high elastic fiber to form poly-4-methylpentene. A diaphragm in which the short edge M1 of
the high elastic fiber is substantially uniformly dispersed in -1 is obtained.
And the melting point of poly 4-methyl pentene 1 is considerably high with about 240 ° C to
polyethylene about 138 ° C and about 176 ° C. That is, the lie-branate (Z), O [ser-Natta,) horn!
l! Poly α-olefins produced under the coordinated anionic polymerization mechanism as
described in 7114 generally have high crystallinity and a high melting point, but among them,
the melting point of Bory-methyl penden 1 is extremely high. In addition, the diaphragm of the
present invention using such poly 4-methylpentene-1 exhibits extremely good heat resistance,
for example, specific elasticity even if there is a temperature rise due to heat generation of a
voice coil or irradiation of sunlight. There is almost no decline in the rate. High frequency
reproduction limit frequency or reproduction frequency special 1 system 1. In particular, it is
possible to prevent the reduction of the sound pressure level in the high sound area. Diaphragm f
of the present invention 9 because poly 4-methylpentene-1 has good water resistance. There is
almost no change in sound quality caused by talking about humidity in the atmosphere, high or
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low, or rain. Furthermore, polyethylene has a specific gravity of about 0.95, while that of
polypropylene is still relatively high at about 0.91, while the specific gravity of poly 4'methylpentene-1 is about 0.84. Smallest among thermoplastic polymers. そのため。 The
diaphragm of the present invention using such low specific gravity poly 4-methylpentene-19-is
lightweight and highly efficient. The diaphragm according to the present invention has the
above-mentioned features, in particular, high heat resistance and high water resistance, and is
suitable for use as an acoustic device for outdoor use, such as car radios, car stereos, portable
radios, tape recorders. . Although it is particularly suitable as a diaphragm for a speaker such as a
record player, it is not limited to such a use. Patent applicant Higashi Shiseido Co., Ltd.-10-
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