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The present invention relates to a flame retardant speaker center camp. In general, the
diaphragm of the speaker is mainly made of cellulose fiber, but is inherently flammable, so it is
vulnerable to fire and is exposed to heat from the speaker voice coil due to excessive input or a
high temperature atmosphere such as a television cabinet. , There was a risk of ignition and
burning. Then, although various flame-retardants of a diaphragm are proposed, the center cap of
a speaker tends to be overlooked, and it is necessary to make flame-retardant like a diaphragm.
Then, although the use of inorganic asbestos is considered as a flame-retardant material of a
center cap, since this is large mass, a speaker sensitivity worsens and it is not preferable also in
sound quality. On the other hand, when the center camp is a cellulose fiber, examples of flame
retardants include boric acid, boron, and chlorine compounds. However, boric acid and boron
have high hygroscopicity and significantly decrease in strength and weight. This increases the
speaker sensitivity and makes the speaker sensitivity worse. In addition, the chlorinated
compounds have a major disadvantage that they generate hygroscopic gas at the time of ignition
as well as hygroscopicity. The present invention has been made focusing on the above-mentioned
point, and it is a stable speaker that has stable quality and does not adversely affect the vibration
characteristics of the speaker, and can be manufactured inexpensively without requiring special
equipment. Intended to be provided. Hereinafter, the present invention will be described in detail
with reference to the drawings. FIG. 1 shows an example of a cone speaker. In FIG. 1, 1 is a back
plate, a pole piece 2 is mounted at the center portion thereof, and a magnet 3 is provided at the
peripheral portion. The plate 4 forms a magnetic cap together with the magnet 3, the pole piece
2 and the back plate l. A voice coil bobbin 6 carrying a voice coil 5 is vibratably inserted into the
magnetic cap and supported by a damper 7. A cone 8 is connected to the bobbin 6 at its central
hole, and a center cap 9 is further crowned. The upper peripheral edge of the cone 8 is
supported by the frame 11 via the edge 10, and the edge 10 is further secured to the frame 11
by the gasket 12. The lead wire of the voice coil 6 is connected to the terminal 14 on the side
surface of the frame 11 through the tinsel wire 13. Although the above is a known structure, in
the present invention, the center cap 9 uses a flame retardant cone 8 and a gasket 12 as well as
the declination.
That is, this center cap 9 is impregnated with an organic phosphorus-containing nitrogencontaining compound in which a low-hol type melamine resin is mixed with a paper pulp formed
from cellulose fibers such as wood pulp and bast fibers, and then heat treated. It is dried to make
it flame retardant. In the present invention, as a material of the center cap, the use of a papermade one instead of a simple sheet is as follows. That is, in order to increase the relative loss
ratio (E /)) and make the internal loss appropriate as in the case of the diaphragm, the center cap
is subjected to instantaneous heating (mold) pressing after making paper or instantaneous
heating during open etc. To dry it. Therefore, the surface is hard and the inside is soft. On the
other hand, in the case of the sheet, since the sheet is gradually dried on the roll over time, the
surface and the inside have substantially equal physical properties. Therefore, when a resin etc. is
impregnated into the center cap, the degree of impregnation and adhesion to the surface and the
inside is totally developed depending on the concentration of the solution, the type of resin, the
curing agent, etc. There is no difference. In order to impregnate such a center cap with a flame
retardant to impart flame retardancy, it is sufficient if the surface of the center cap is covered
with a flame retardant, and it is not necessarily required that the inside be permeated. Therefore,
in the present invention, impregnation with a flame retardant by impregnation with a flame
retardant includes not only ordinary impregnation but also covering only the surface of the
center cap, but it is rather high in water absorbability, and thus changes over time. It is important
to achieve the reduction of the large flame retardant by causing the decrease of the Young's
modulus as much as possible to achieve the flame retardancy, and to improve the non-water
absorbency, the Young's modulus and the weight increase by adding other components such as
resin. It becomes. The organic phosphorus-containing nitrogen-containing compound used as a
flame retardant in the present invention is an alcohol (for example, ethanol, methanol) -soluble
one containing a phosphonic acid derivative as a main component, and harmful gas generating
components such as chlorine and bromine as in the prior art Not included. As the organic
phosphorus-containing nitrogen-containing compound, for example, a commercially available
solution solution of 17.1% by weight of phosphorus and 7.7% by weight of nitrogen can be used.
A flame retardant diaphragm is obtained by impregnating this organic phosphorus-containing
nitrogen compound, but in the present invention, a low-form melamine resin and one to which an
organic amine salt is added as a catalyst are used. The low-form melamine resin refers to a socalled 3-methylolmelamine obtained by reacting formalin and melamine, which is smaller in
formalin content than 6 methylolmelamine, and is used in the alcohol soluble state by
By using this low-hol type melamine resin, the water absorption by the impregnation of the flame
retardant is improved to make it non-hygroscopic, and one having excellent mechanical strength
such as compressive strength and 31 tensile strength as well as heat resistance improvement can
be obtained. . That is, according to the present invention, the center cap has a large internal loss
because it is mainly composed of a cellulose fiber, and the mechanical strength (Young's
modulus) is increased by the impregnation of a low-hol type melamine resin. You can get Next, a
method of manufacturing a flame retardant center cap will be described. First, a center cap sheet
mainly made of, for example, cellulose fibers such as wood pulp is paper-formed and a center
camp is obtained by die-cut. Immerse the cap in a methanol mixed solution of an organic
phosphorus-containing nitrogen compound and a low-form melamine resin, or apply it by
spraying, brushing, etc., and then heat treat and dry under conditions such as 100 ° C. for 15
minutes. Thus, a flame retardant center cap can be obtained. The desired flame retardancy and
hardness of the center cap can be obtained by changing the amount of phosphorus-containing
nitrogen compounds attached to the cap or their compounding ratio, but the amount of adhesion
to the cap is 8 to 20% by weight. It is appropriate to do. For the organic phosphorus-containing
nitrogen compound, an alcohol solution of 5 to 20% is used, and the compounding ratio of the
compound to the low-form melamine resin and the organic amine salt is 5 to 2 by weight: 0, 0 to
5: 0. The mixed solution is prepared to be 1 to 3. As described above, in the present invention,
since an alcohol such as methanol is used as a solvent, it is possible to rapidly process a cellulose
fiber which easily swells in an aqueous system while maintaining its form. Hereinafter, the
present invention will be specifically described by way of examples. Example 1 A center cap with
a bore of 10 is formed into a paper sheet, and an organic phosphorus-containing nitrogencontaining compound, FLAMEGARD 5527 (manufactured by Dainippon Ink "", and 1: 1 as a lowform melamine resin BECAMINP PM-N (manufactured by the same company) The center cap,
which is diluted with methanol to a concentration of 8% by weight ratio and impregnated at 100
° C and dried for 15 minutes, is taken as a combustion test. I got a cap. This center cap exhibits
excellent flame retardancy meeting the requirements of UL Standard 94-V-0. Example 20 A
center cap with a diameter of 8 cIl was formed into a paper sheet, and impregnated with an
alcohol mixed solution prepared by adding 0% by weight of BECAMINEl and 55.2% by weight of
FLAMEGARD to 0.5% by weight of organic amine salt In the combustion test, the center cap dried
in the above was taken out from the disaster, and a flame-retardant center camp without ignition
was obtained.
As described above, according to the present invention, since flame retardancy can be imparted
by impregnating with a treatment liquid containing an intrinsically flammable center cap
composed mainly of cellulose fiber, the possibility of heat generation of the speaker voice coil Or
even if it is easily exposed to high temperature such as a television scene cabinet, it can be used
without giving a risk.
Brief description of the drawings
The drawing is a longitudinal sectional view of the cone-soo force according to the present
フレーム、12・・・ガスゲット。 Patent Assignee Pioneer Corporation Domoto Co. Mogami
Electric Co., Ltd.
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