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TECHNICAL FIELD The present invention relates to a speaker diaphragm. BACKGROUND ART In
general, performance required of a speaker diaphragm is lightweight, has high Young's modulus,
low density, and appropriate internal loss so that the output sound pressure frequency
characteristics of the speaker and the like can be favorably obtained. It is That is, the higher the
Young's modulus and the lower the density, the higher the resonant frequency of the diaphragm,
and the wider the piston movement area, the wider the frequency band of the speaker (and the
larger the internal loss, the smaller the split resonance of the diaphragm. Frequency
characteristic is flattened. From this point of view, a diaphragm that satisfies the abovementioned required performance is formed by paper-forming of a conventionally beaten natural
fiber, a chemical II, or a fiber material obtained by mixing these. The board is widely
manufactured. Since such a diaphragm is manufactured by paper-making, it is weak to moisture
and moisture, and absorption of moisture causes deterioration of its performance and the like.
However, recently, as in the case of outdoor use of a speaker or the case of a door mount in J5,
the usage of the speaker is expanded, and the speaker touching water and moisture is increasing.
Accordingly, the diaphragm itself of the speaker is also required to have water repellency and
water resistance. Conventional methods for increasing the water resistance of the diaphragm
include, for example, a method of covering the main surface by subjecting the base material after
paper making to a thermosetting resin and subjecting it to a treatment such as heating and
pressing. A mixture of a thermoplastic resin and natural 1 [, chemical fibers or fiber material
diagonals made of these is mixed and then subjected to a process such as heating and pressing to
heat the resin m! Q ′ ′; t2y u−, method of covering the main surface is 9JJ. However, with the
diaphragm subjected to the waterproofing process of the former method of the above-mentioned
conventional method, although the waterproofness is high and the V jig rate is large, Tano is the
flattening of the sound pressure frequency characteristics because the density is large and the
internal loss is small. When the latter method is used, when thermoplastic resin fiber is added
until it has sufficient waterproofness, the V jig rate becomes small, and the sound pressure
frequency characteristics in the high frequency range can be reduced. With the decrease of the
efficiency was also bad. As described above, the conventional speaker diaphragm can not
simultaneously satisfy sufficient waterproofness and preferable physical properties such as
Young's modulus, density and internal loss. Therefore, an object of the present invention is to
provide a loudspeaker diaphragm having sufficient water resistance while having high Young's
modulus, low density and sufficient internal loss. The speaker diaphragm of the present invention
is characterized in that it is made of a base material obtained by forming a natural fiber, a
chemical fiber or a mixture of these, and impregnating it with a polyurethane-based Pf4 fat
solution and drying and curing it.
EXAMPLES Hereinafter, one example of the present invention will be described with reference to
the attached drawings and the following table. First, a natural fiber such as NBKP (coniferous
wood bleached to pulp 1) is beaten as a raw material 5 to adjust the degree of beating to 20 to
22 degrees SR. Then, disperse it in the suspension of the paper making tank, make a desired
diaphragm shape, for example, a cone-shaped papermaking net, and then make a cone-shaped
mold with a humidity of about 180 ° C. It is dried under a pressure press of about OKg / Cm 'to
form a substrate. Next, a polyurethane resin solution is compounded and prepared as shown in
Table 1. Table 1 Here, a solution obtained by diluting a prepolymer such as a polyurethane resin
C, for example, a trifunctional polyol, with a diisocyanate such as a trifunctional polyol with a
solvent such as thinner is used. Then, the base in the core shape is dipped in the prepared
solution to impregnate the solution between the fibers of the valve forming the base, and the
polyurethane resin is attached to the fibers in the base. Thereafter, the solvent is volatilized and
dried by hot air at a temperature of about 60'C in a drier. The base material having undergone
these steps is cut into a predetermined shape to obtain a speaker diaphragm. In addition, for
waterproofing of mulberry, it is necessary to block these porous systems for paper-making of
natural mulberry NW J, and for the waterproofing of rutin, prepolymers of isocyanina-1 to C
prepolymers that can be added to polyurethane resin are heat, In order to form a threedimensional polymer by self-handling J: application to moisture etc., the sealing effect is
sufficiently exhibited even under the conditions as in this embodiment. However, for example,
when bonding between the fibers is weak when the diaphragm substrate is dried without being
pressed with a mold or the like, the prepolymer isocyanate may be a polyoxy compound such as
glycol or triol, diamine, By adding a polyamino compound specific to liamine as a curing agent,
higher filling effect and water resistance can be imparted to the substrate. FIG. 1 is a crosssectional view of the speaker diaphragm of the present embodiment, which is thus iq, showing a
cone shape. FIG. 2 is an enlarged cross-sectional view of a part of the base 1 with a circle し in
FIG. 1, and a base t11 forming the base 4 is sealed with a polyurethane resin 2. Therefore, the
strong bond between IHl fi 1 enhances its effect by the polyurethane resin 2. Moreover, the fiber
1 shows human beings t + lt or actinic radiation scraps, and the base material 4 is formed by
forming 111 single fibers or a mixture of these fibers. Table 2 shows the vibrating plate C of the
present example which was subjected to heating and drying at 60 ° C. (1) and to which a curing
agent was added and was subjected to heating and drying at 60 ° C. (2). Each physical property
value of the base material which is not waterproofed yet is shown.
When the two are compared, the diaphragm of the present embodiment is characterized in that
the characteristic of WIJ is utilized because the Young's modulus, the internal loss, and -b are
added or substantially held after eliminating the extreme increase in density. Know that
Moreover, as a result of conducting an air permeability test based on JIS-1] 8117 on the
diaphragm of the present invention, the 100 cC penetration time is 53.3 seconds for the base
material which is not treated yet, but the diaphragm of the present embodiment After 10
minutes, it did not reach up to 100 cc, but it was closed enough. Roughly, FIG. 3 shows the
output sound pressure frequency characteristic curve A of the speaker according to the
diaphragm of the present embodiment measured under the same conditions, and the output
sound pressure frequency characteristic of the speaker according to the diaphragm comprising
the base material not waterproofed. Face 1t! It is a graph which shows dB and compares both. It
can be seen that the loudspeaker with the diaphragm of the present embodiment has less split
resonance, and flat output sound pressure frequency characteristics are obtained between the
high sound areas. In the present example, natural tjAH has been described, but chemical fibers or
composites thereof can also be applied. In addition, in the paper-making process, the
waterproofness can be further improved by adding an internal-size cake of urea-formaldehyde
resin, styrene resin or the like to the beaten pulp. According to the present invention, since the
polyurethane resin cures at a relatively low temperature according to the present invention, even
a material which is difficult to be heat treated at a high temperature (fiber material V [for
example, containing synthetic fiber as a base material)] It is possible to obtain a diaphragm which
has a hardness equal to or higher than that of the base resin and which is waterproof and water
resistant. Since the sealing effect is sufficiently exerted even without heat pressing, the adverse
physical effects such as increase in density of the substrate and decrease in internal loss due to
heat pressing are eliminated and the physical properties of the substrate can be fully utilized. .
The main surface of the substrate is sufficiently sealed by the cured polyurethane resin and does
not require waterproofing with a conventional coating, so the number of manufacturing steps
can be reduced.
Brief description of the drawings
1 is a cross-sectional view of the speaker diaphragm of the present invention, FIG. 2 is an
enlarged cross-sectional view of a portion shown by circle A in FIG. 1, and FIG. 3 uses the
diaphragm according to the present invention It is a J graph which shows the output sound
pressure frequency characteristic of a speaker.
Explanation of the sign of the main part
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