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Description 1, title of the invention
Method of manufacturing speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a speaker diaphragm. It is desirable that the diaphragm of the speaker (reproduce
the faithful sound in the second place). It is desirable for the diaphragm of the speaker to make a
piston movement over as wide a range as possible. For this reason, it is advantageous to use one
that is light and hard in nature. Assuming that Young's modulus is E and dense # is δ, it is more
advantageous as the specific elastic modulus Vδ is larger. The reason is that the larger the speed
of sound propagation in the material of the diaphragm, the larger the speed of movement of the
piston, the wider the range of movement. Highly elastic fibers such as carbon fibers for this
purpose. Many attempts have been made to increase the propagation speed IfF [7 of the
diaphragm by mixing metal fibers, inorganic fibers, etc. with natural fibers such as pulp, but
satisfactory results have not yet been obtained. That is, the diaphragm thus created causes a drop
in the EndPage: 1 sound pressure level in the high frequency range due to the speaker frequency
characteristics. The feature of the present invention 1 is that the natural fiber and the response
characteristics in the high frequency range which can not be obtained by the conventional
carbon fiber-containing diaphragm can be improved by 3000-% (-e addition). It is a thing. When
high modulus carbon fiber having a Young's modulus of 15000φ-2 or more is used, the
diaphragm obtained by mixing it with other fibers such as pulp tends to be bulky and the density
of carbon fiber increases as the carbon fiber content increases. There is a tendency C 2 to
decrease. However, such bulky ・) one low density diaphragm. The decrease in bonding points
between fibers and the decrease in entanglement effect are considerable, and despite the use of
carbon fiber with high Young's modulus C, the Young's modulus as the diaphragm is lowered,
and eventually the propagation speed of the diaphragm We can not expect a large increase in rg
and tun 7. (As in the present invention, by using a relatively low Young's modulus carbon fiber of
3000 to 1500 QKp / m 2 and setting its content to 90 to 60, the diaphragm is bulky Speed 葎]
71Ir: large enough (can be two. Another feature of the present invention is as follows. That is.
The diaphragm substrate obtained by sheet-forming as described above is subjected to a
chemical plating treatment, and the fibers constituting the diaphragm are bonded with metal. The
diaphragm made using high elastic fiber Y such as carbon fiber usually lacks the bonding force
between fibers and the entanglement effect, so that the effect using ^ elastic fiber is usually not
sufficiently exhibited. there were. On the other hand, according to the present invention, by
performing a chemical plating process on the diaphragm substrate, the bonding force between
the fibers can be increased, and the μ / a of the diaphragm can be increased.
In addition, bonding between fibers is performed by chemical plating, unlike the case with Naked
Metzene treatment, the plating solution penetrates the narrow portions between the fibers due to
the wetting effect by the use of an appropriate surfactant. Between fibers (two equally deposited
metal? It is excellent in that it can be done. That is, it is possible to prevent the increase of the
density δ in response to the extra metal deposition. Another feature of the present invention is
as follows. That is, prior to the chemical plating treatment of the formed diaphragm substrate as
described above, the diaphragm substrate is subjected in advance. Thermosetting resin is applied
because of heat resistance and water resistance. This is to prevent the diaphragm substrate from
being treated with a treatment solution (two immersions (two, it is possible to prevent
deformation). Examples of thermosetting resins include phenol resins, polyester resins, melamine
resins, lily resins, silicone resins and the like, and among these, it is characterized in that C:
silicone resin is used. In general (in addition to the fact that the propagation velocity of the
material is large as one of the characteristics required for one diaphragm also), the Q value of the
material (reciprocal of internal loss) needs to be suppressed to an appropriate level. That is, as
the Q value of the diaphragm increases, a large peak is likely to occur near the high frequency
range limit frequency due to one frequency characteristic. Therefore, it is preferable to keep the
Q value of the diaphragm low, in order to prevent generation of peaks in the high range. To the
present invention. In addition, among the above-mentioned resins to be attached, other resins
except silicon resin have high Young's modulus of the resin itself as shown in Table 1, so the Q
value of the diaphragm on which this resin is adhered becomes considerably high. Not desirable.
@ 1 Table In contrast to this, silicon resin can suppress the Q value of diaphragm attached to this
to a low value because the Young's modulus is extremely small at + / + OO [1 or so compared to
these thermosetting resins. it can. 9! Silicon resin is heat resistant. Water resistance and
chemical resistance are far superior to those of the other thermosetting resins mentioned above
(1. The purpose of chemical resistance (both are optimal. Furthermore, it is important that the
adhesion amount of the silicone resin to the diaphragm substrate is 0.5 to 10% of the weight of
the diaphragm substrate. That is, if the amount of adhesion is smaller than this, the vibration
EndPage: 2 plate substrate is sufficiently formed (two water resistance, heat resistance and
resistance to marringing C cause a deformation of the diaphragm substrate in the primary
chemical plating treatment. . On the other hand, in the case of 10% or more and adhesion, only
the increase of the density δ is caused, and the sound speed of the diaphragm is lowered, which
is not preferable.
The deposition of the silicone resin is carried out by impregnating or coating the diaphragm
substrate with a silicone resin solution. Next, chemical plating is performed using electroless
plating or silver mirror reaction, and metal plating is a metal having a high specific elasticity,
such as 2 · ν nickel, cobalt, chromium, etc. Hereinafter, specific embodiments of the present
invention will be described. First of all, 6 parts of carbon fiber with a diameter of 12 μm and
Young's modulus of 10000 KV'wm2, 70 parts of cut wmC, 50 parts of kraft pulp ff: 50 parts, 20
parts of cut II vinyl alcohol fibers Blended. The sheet is formed and heat-molded to obtain a coneshaped diaphragm substrate. Next, such a diaphragm substrate (= silicon resin adhesion site
silicone m oil (E. Tokyo Re) 1 8R · 2100) 5 parts impregnated with a solution of 95 parts toluene
is left to stand for 24 hours for room temperature curing, and the diaphragm substrate The heat
resistance, water resistance, and chemical resistance. Finally, the above-mentioned diaphragm
substrate on which the silicon resin is attached is subjected to electroless nickel plating to
precipitate nickel on the entire surface of the diaphragm substrate. This precipitation step is
carried out as follows. First, the diaphragm substrate is subjected to a degreasing treatment 7
and then subjected to a sensitization treatment in which it is immersed in a solution containing
tin chloride-tin for several minutes at room temperature. Next, the diaphragm substrate is
activated by being immersed for several minutes in a 50 ° C. solution containing balanoum
chloride. After this activation treatment, a pre-immersion treatment is performed. This pre-dip
treatment is carried out at room temperature in a solution containing sodium hypophosphite.
After these pre-treatment steps, wash all with water. Finally, the diaphragm substrate is dipped in
a solution of 70 ° C. containing nickel chloride and sodium hypophosphite for 2 minutes for
nickel plating treatment. In this manner (2) electroless nickel plating is carried out to deposit
nickel over the entire surface of the carbon fiber and other fibers constituting the diaphragm
substrate and the entire surface of the M bone portion. Achieve an increase in the strength and
entanglement between fibers. Next, another embodiment will be described in which a phenolic
resin is deposited instead of a silicone resin in the production process 9 packing process. 7
processing solution 0 phenol resin 6 parts O curing agent 06 parts 0 Methano-A 796.7 capital,
after the adhesion of this phenol plating nickel after the plating process], and the above Siri · · ·
after = = Shiga The characteristics of each of the diaphragm plate and the cone-shaped
diaphragm substrate before the adhesion of one resin to each other are shown in Table 2C. 表 2
Table 2 ζ This method of adhering / / recon resin resin layer is a method of adhering フ ェ ノ
ー ル resin (2 compared with Q, @ can be kept low compared with 2 and high frequency range (1
in 1 I can do half.
The manufacturing method of the present invention is clear in the above explanation D1.
Propagation velocity and Young's modulus without increasing density significantly? As well as
being able to improve, ((2) high frequency range frequency characteristics ('-generation of peak
can also be suppressed. Therefore, the manufacturing method of the present invention
(diaphragm for speaker manufactured by two? Loudspeaker C: It is possible to provide an
excellent playback sound by putting it in together. Patent Assignee Sanyo Koki Co., Ltd.
Representative Ige Tei EndPage: 3