JP2000152376

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DESCRIPTION JP2000152376
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various types of audio equipment, a method of manufacturing the
same, and a speaker using the speaker diaphragm.
[0002]
2. Description of the Related Art Conventionally, a speaker diaphragm for waterproofing, which is
mainly used for waterproofing audio equipment, is formed by heat and pressure forming into a
diaphragm shape by mixing paper making of synthetic fibers excellent in water resistance and
natural pulp fibers. In order to increase the moisture resistance of the product, a product
obtained by impregnating with a solvent-based acrylic resin, a polyester-based resin or the like,
or a product obtained by laminating a polyamide film or a polyethylene film monolayer film on
the surface has been used.
[0003]
[Problems to be solved by the invention] In the above-mentioned speaker diaphragm, it is
difficult for the former to completely eliminate the pinhole, and it is impossible as a speaker
diaphragm for complete waterproofing, and in the latter, it is possible to use polyamide Although
the waterproof diaphragm for a speaker made of a film has no problem in adhesiveness, the
polyamide film itself has a hygroscopic property, so that the physical properties of the
diaphragm for the speaker are extremely degraded and the sound quality of the loudspeaker is
deteriorated. It was
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[0004]
In addition, although the diaphragm for speakers which laminated olefin system films, such as a
polyethylene film in consideration of waterproofing property, waterproofing was fully obtained,
adhesiveness is bad and a voice coil joined to a diaphragm for speakers, a dust cap There are
many problems in bonding with other speaker components such as gaskets, and it is not
satisfactory as a speaker diaphragm for waterproofing such as water leak due to adhesive failure.
[0005]
The present invention improves the conventional defects as described above and improves the
problems of hygroscopicity such as polyamide-based films and bonding properties with other
joint parts such as olefin-based films. A speaker diaphragm having a waterproof property, a
method of manufacturing the same, and a speaker using the speaker diaphragm are provided.
[0006]
[Means for Solving the Problems] In order to solve the above-mentioned problems, the speaker
diaphragm of the present invention is formed by mixing paper made of synthetic fibers excellent
in water resistance and natural pulp fibers into a diaphragm shape by heating and pressing. The
molded product is constructed by laminating a composite sheet of a film having excellent
waterproofness on at least the molded product side, and a film construction excellent in bonding
property superimposed on the film. While being excellent, it can provide the diaphragm for
speakers excellent also in the bondability with other parts for speakers, such as a gasket.
[0007]
DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present
invention, at least a molded product formed by mixing paper making of synthetic fibers excellent
in water resistance and natural pulp fibers and heat-pressing them into a diaphragm shape is
used. This composite is made by laminating a composite sheet made of a film having excellent
bondability superimposed on a film having excellent waterproofness on the side of the molded
product, which is excellent in waterproofness, and also for other speakers such as a gasket. The
speaker diaphragm is also excellent in bonding with the components of the above.
[0008]
In the invention according to claim 2 of the present invention, 20% or more of a polyethylene
fiber and / or an aromatic fiber is blended as a synthetic fiber excellent in water resistance with
the molded article according to claim 1, and further natural pulp fiber And mixed with paper,
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heat and pressure molded into a diaphragm shape, impregnated with 0-30% of acrylic resin and /
or polyester resin, and further impregnated with 0-10% of fluorine resin, By impregnating the
speaker diaphragm with a solvent-based acrylic resin, the moisture resistance is improved, and
by impregnating a fluorine-based resin, the water repellency is further improved to further
improve the waterproof performance.
[0009]
In the invention according to claim 3 of the present invention, an olefin-based or polyester-based
film is used as the film excellent in waterproofness according to claim 1, and a polyamide-based
film is used as the film excellent in bondability. Therefore, it is possible to provide a speaker
diaphragm having excellent waterproof performance.
[0010]
The invention according to claim 4 of the present invention is a method for producing a molded
product obtained by mixing papermaking of synthetic fiber excellent in water resistance and
natural pulp fiber and heating / pressing it into a diaphragm shape at least on the side of the
molded product. In a method of manufacturing a diaphragm for a speaker, which is formed by
laminating a composite sheet having a film configuration that is superimposed on a superior film
and has excellent bondability, the above-mentioned molded article heated and pressure-formed
into a diaphragm shape is set The mold temperature is set to a temperature of 40 ° C. or more
and 100 ° C. or less than the softening temperature of the composite sheet, and the composite
sheet is laminated in a reduced pressure state on the molded product set in the mold. It is an
object of the present invention to provide a method of manufacturing a speaker diaphragm
having waterproof performance.
[0011]
According to a fifth aspect of the present invention, there is provided a magnetic circuit portion,
a frame coupled to the magnetic circuit portion, and an outer periphery coupled to the frame via
an edge and an inner periphery being a magnet of the magnetic circuit portion. The speaker
diaphragm according to claim 1 or 2 or 3 coupled to a voice coil fitted in a gap, and an adhesive
in the speaker diaphragm so as to cover the voice coil with no gap. It is composed of a combined
waterproof dust cap, which makes it possible to provide an extremely excellent waterproof
speaker without water penetration from the speaker diaphragm side to the magnetic circuit
portion of the speaker. is there.
[0012]
Hereinafter, an embodiment of a speaker diaphragm according to the present invention will be
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described with reference to FIGS. 1 to 3.
[0013]
FIG. 1 is a half sectional view of a speaker using a speaker diaphragm according to an
embodiment of the present invention, FIG. 2 is an enlarged sectional view of an essential part of
the speaker diaphragm, and FIG. 3 is for explaining a waterproofing test. Side sectional view of
FIG.
[0014]
According to the drawing, reference numeral 3 denotes a field portion, which is formed by
laminating and connecting a lower plate 5 provided with a center pole 4, a ring-shaped magnet 6,
and a ring-shaped upper plate 7.
[0015]
Further, a frame 8 is coupled to the upper surface of the field portion 3, and a speaker
diaphragm 11 is coupled to the periphery of the frame 8.
A dust cap 12 formed of a polyester film is attached to the inner peripheral portion of the central
portion of the diaphragm 11 for the speaker in order to obtain waterproofness, and the lower
side of the inner peripheral portion of the central portion of the diaphragm 11 for the speaker
(dust cap 12 The voice coil 13 is coupled to the lower surface of the magnetic disk 1), and the
voice coil 13 is supported by a damper 15 at an intermediate portion so as to engage with the
magnetic gap 14 formed in the field portion 3 without eccentricity.
Reference numeral 18 is a gasket for eliminating a gap with the mounting case when the speaker
is attached, and a rubber gasket is used when waterproof is required.
[0016]
Next, the speaker diaphragm 11 will be described in detail. This speaker diaphragm 11 mixes
paper with synthetic fibers excellent in water resistance and natural pulp fibers to prepare a
diaphragm-shaped article, and further heat and pressure are applied. The molded product 9 is
formed, and a composite sheet 10 composed of two kinds of film structures of a film 16 excellent
in waterproofness and a film 17 excellent in bondability is laminated on the molded product 9.
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An olefin-based film is used as the film 16 excellent in waterproofness, and a polyamide-based
film is used as the film 17 excellent in bonding property.
[0017]
The speaker diaphragm 11 is obtained by laminating the composite sheet 10 on the molding 9,
but as laminating conditions, the composite sheet 10 is used to set the molding 9 subjected to
mixed paper making and heating and pressing in a mold. Is heated to a temperature 40 to 100
degrees higher than the softening temperature of the respective films 16 and 17 of the
composite sheet 10, and quickly set in the mold when the composite sheet 10 sufficiently
increases its flexibility. The composite sheet 10 is laminated by reducing the pressure with a
vacuum pump via the molded product 9.
The heating conditions are 140 degrees to 160 degrees, and the heating time is 15 seconds to 20
seconds.
[0018]
Next, the waterproofness will be described in comparison with the conventional one.
A is a speaker with a diameter of 12 cm using the speaker diaphragm 11 according to the
embodiment of the present invention in FIG. 2, and the composite sheet 10 uses a polyethylene
film of 30 microns as the film 16 excellent in waterproofness, And a 30 micron 6 nylon film.
[0019]
B is a comparative example, which is changed to the composite sheet 10 and equipped with 100
nylon 6 nylon (others are the same as A).
C is also a comparative example, and it is what changed to the composite sheet 10, and equipped
with a 100-micrometer-thick polyethylene film (others are the same as A).
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[0020]
The results of the waterproofing test (at a water depth of 60 cm) are shown in Table 1 below.
In the waterproofing test, as shown in FIG. 3, the speaker is attached to the cylindrical jig 19 via
the rubber gasket 18, and water is poured into the cylindrical jig 19 to a height of 60 cm, and the
position and degree of water leakage To observe.
Therefore, the dust cap 12 is adhered to the speaker diaphragm 11 with no adhesive and with an
adhesive, and the gasket 18 and the cylindrical jig 19 are also attached with no clearance.
[0022]
According to the above (Table 1), A was good in both the waterproofing test and the bonding
property, but Comparative Example B was not able to perform the waterproofing test because of
pinholes, and Comparative Example C was good in the waterproofing test. Although there were
adhesive strengths (such as gaskets), they were inferior to others.
[0023]
Next, heat resistance (stand at 100 ° C for 150 hours), cold resistance (stand at -40 ° C for 150
hours), thermal shock (20 cycles of 1 hour each in each tank at -40 ° C to 85 ° C), moisture
resistance Each test (standing at 55 ° C., 90% for 500 hours) was carried out, and the above
waterproof test was carried out after each test.
The results are shown in (Table 2).
[0025]
According to the above (Table 2), no water leakage occurred even in the waterproofing test after
each of the above tests.
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In Comparative Example B, a water leak occurred from the speaker diaphragm in any waterproof
test after the test (it is considered that there is a minute pinhole in the 6 nylon film).
In Comparative Example C, no water leakage occurred in the waterproofing test after the heat
resistance and cold resistance tests, but in the waterproofing test after the thermal shock and
moisture resistance tests, water leakage occurred between the rubber gasket and the speaker
diaphragm It occurred (it is considered to be due to the deterioration of the bonding strength).
[0026]
As described above, it was confirmed that the speaker diaphragm of the present embodiment is
excellent in waterproofness.
[0027]
In the above embodiment, an olefin-based film is used as the film 16 having excellent
waterproofness, but the same effect was confirmed using a polyester-based film.
[0028]
In addition, the molded product 9 of the speaker diaphragm 11 is impregnated with 0 to 30% of
acrylic resin and / or polyester resin, and further impregnated with 0 to 10% of fluorine resin to
impregnate solvent-based acrylic resin. It is possible to improve the moisture resistance by
processing and further improve the water repellency by impregnating the fluorocarbon resin,
and to further improve the waterproof performance.
[0029]
As described above, the speaker diaphragm of the present invention has a waterproof property
on the surface of a molded product formed by mixing paper making of synthetic fibers excellent
in water resistance and natural pulp fibers and heating and pressing it into a diaphragm shape.
An excellent waterproof property can be obtained by laminating a composite sheet composed of
two kinds of film configurations excellent in the properties and the bondability.
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