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JPS59229997

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DESCRIPTION JPS59229997
[0001]
TECHNICAL FIELD The present invention relates to a diaphragm for a speaker, which is
manufactured by forming a fiber, such as natural tLa fiber or synthetic fiber. Generally, the
following conditions are required as a speaker diaphragm. ■ Low density, lightweight. ■ High
Young's modulus. ■ The internal loss is suitably large. The condition of (3) is for improving the
transient characteristics and for reducing the peak of the lowest resonance frequency fo, and for
increasing the acoustic output under the conditions of the high frequency characteristics and for
improving the transient characteristics and the high frequency characteristics. The condition of
(3) is to eliminate the influence of noise vibration and flatten the frequency characteristic.
Furthermore, in addition to these conditions, it is required that it is industrially processable and
inexpensive. As a thing which satisfies the said conditions to some extent, the diaphragm formed
by paper-making the natural fiber which refined wood pulp is known. In this diaphragm, there is
a certain limit in increasing the tongue ratio by adjusting the degree of beating of wood pulp, and
there is a problem that the density increases with increasing the Young's modulus here. In
addition, depending on the use environment, there was also a problem in waterproofness.
Therefore, for example, an epoxy resin etc. are made to adhere after paper making, and) Jn E! y
There have been variously proposed ones subjected to pressure treatment and those obtained by
dispersing and mixing synthetic fibers such as polypropylene at the time of sheet making.
However, although the former can increase the Young's modulus in the former, it has a large
increase in density and there is a problem that the internal loss is small, and in the latter, the
waterproofness is 7-g, Z However, there was a problem that could not be high Young's modulus.
The present invention has been made to solve the above-mentioned problems, and the object of
the present invention is to increase the Young's modulus by a factor of 11 while making use of
the characteristics of the diaphragm made of the fiber u: I'E +. And a speaker diaphragm capable
of improving waterproofness. In the present invention, j-waiting is made on a vibrating plate
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made of a fiber material by coating, and 1ζJ rosin is applied by means such as 82- / 12. An
embodiment of the present invention will be described below with reference to the drawings. In
FIG. 1a, reference numeral 1 denotes a diaphragm, which is molded into a cone shape, and rosin
2 (see FIG. 1) is attached on the entire surface and back as it is. Each vibration J plate 1 is
manufactured, for example, as follows. First, N, UKI) pulp is subjected to Ill 鵬 v to adjust to a
predetermined degree of freeness (about 20 ° SR), and then this stock (wood 4J pulp fiber) is
formed into a cone shape to obtain a ten-shutter plate. On this vibrating plate, a spray gun
(caliber 1.x) was used ethyl alcohol solution Ik in which WW1 nocin having the following
composition was melted at a ratio of 5'Q w 1%.
About 20% by O ψ) ■ Cloth 1. After that, it is dried by hot air at 80 ° C. Here composition
levopimaric acid ............ 68% neoabietic acid ...... 16% Dekisutoropimaru acid ... 16% of rosin and
Hirotsu amount is less than 20% Sufficient waterproofing can not be obtained, and if it is more
than 20%, the density increases. Thus, when rosin 2 is loaded, as shown in FIG. 1, rosin 2
penetrates between wood 44 pulp fibers Ia and acts as a filler, thereby increasing the Young's
modulus, Waterproofness is also improved. The following table shows the measurement results
of the density, Young's modulus, internal loss, transmission speed and the like of the diaphragm
1 of the above-mentioned embodiment B). In the table, the same measurement results of the
diaphragm before putting on the rosin 2 are shown as a ratio 1y, as an example. As is apparent
from the above table, by attaching 1 'jin 2 (= J, the tong rate is significantly increased, and a
diaphragm 1 having its own internal loss can be obtained. Also, since the density does not change
much, 誼 / ρ increases as a result. As for waterproofness, a test diaphragm 1 'as shown in FIG. 2
is made into a sheet, rosin 2 is attached as described above, and it is filled with water 3 and filled
with water 3.24. Although it carried out as an apparatus between n and y, the penetration to the
inside was not seen. Fig. 5 shows the vibration 1 of this embodiment and the swing J plate of the
comparative example of the above-mentioned table)? , Shows one wave 9h nature. As apparent
from the figure, in the present embodiment, the high range is improved as compared with the
comparative example, and the high range is extended. In addition, I: I zine is used as an
internalizing agent and is conventionally used, or in this case, L :! Gin is an internal addition, and
only acts as an adhesive between pulp fibers la next month as shown in FIG. 3. Even if the
amount added to twist is greatly increased, there is no waterproofness (also Young y · · · 1 can
not be increased to the extent shown in the above table. As the adhesion means of the rosin 2, in
addition to the spray coating 1 by a spray gun, there is one by impregnation. In the case of the
impregnation, if it is pressed with a die heated to 120 ° C. to 140 ° C. after the solvent before
drying, the tong rate can be further increased. FIG. 1 shows another embodiment of the present
invention. According to this embodiment, about 10% of the rosin 2 is welded to the cone top of
the diaphragm l. As described above, the adhesion of rosin 2 to the top of the cone can also
improve the reproduction limit at j6 in the high tone range. In order to improve the highfrequency characteristics, it is necessary to prevent strong uniform divisional vibration from
occurring over the entire diaphragm, but to attach the rosin 2 means that the diaphragm It is a
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self-effective method of dispersing, and an effective method of providing sufficient braking
resistance.
In the above-described embodiment, the case where rosin 2 is attached to diaphragm 1 made of
ice phase valve fiber is shown, but synthetic fiber mixed with or synthetic fiber may be used. The
same effect can be obtained no matter how you wear it. As described above, according to the
present invention, since rosin is attached to the vibrating plate made of paper-based fibrous
material by means of coating, impregnation, etc., the vibrating plate made of the fiber + 71 is
made of paper! The Young's modulus can be improved while making use of the lY property, and
the waterproof property can be provided. In addition, the density does not change so much that it
can increase 7), and the inside g13 loss can be appropriately large jλ: one by one.
[0002]
Brief description of the drawings
[0003]
The drawing shows an embodiment of the present invention, and FIG. 1a shows 1υi face 1, FIG.
1 shows an illustration showing the state of a foil of rosin, and FIG. 2 is an explanatory view of a
waterproof test. Fig. 3 is an explanatory view of the same system as Fig. 1 and Fig. 4 is a
sectional view showing another embodiment, and Fig. 5 is a frequency, when Fig. 3 shows the use
of 1 "jin as the inner surface" · f 11 ". FIG.
■ ・ ・ ・ Vibration y, g, 2 ... rosin.
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