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10 statements F statement! J1 ′ ′ Name Speaker Diaphragm 5 Detailed Description of the
Invention The present invention is a loudspeaker diaphragm Kll. The speaker diaphragm, which
is usually made of fibers, causes a drop in the output sound pressure level in the high frequency
range due to the frequency characteristics of the single frequency wave, which is caused by the
insufficient bonding force between the fibers. The present invention has been made in view of
these points, and is characterized in that the diaphragm substrate is subjected to chemical plating
treatment, and the fibers constituting the diaphragm are bonded by metal. According to the
present invention, the bonding strength between fibers can be increased to improve the acoustic
characteristics of the diaphragm. At this time, bonding the fibers with metal means that the metal
has a very high Young's modulus, and by appropriately suppressing the deposited film thickness
of the metal by plating, the characteristic of the speaker can be further improved. He is excellent
at points. That is, in order to reproduce faithful sound in the speaker, it is desirable that the
diaphragm, which is the vibrator of the speaker, perform piston movement over as wide a% fh @
range as possible. If the density is 11 and the density is 8), the diaphragm can be made light and
stiffened. In addition, bonding between fibers by chemical plating is different from that
performed by electroplating, the surface tension effect by use of an appropriate surface-active
material, and plating solution is also applied to narrow portions between fibers. It excels in that it
can penetrate and cause metal deposition uniformly between fibers. That is, excessive metal
deposition can be suppressed to prevent an increase in density. In the present invention, the
metal deposition film thickness by chemical plating is most preferably 2 to 6 II +. That is, as the
speaker diaphragm, the Young's modulus is not sufficient and the sound speed related to the
sound pressure level is also small, and finally the Young's modulus increases EndPage: 1 by 3 #
or more. However, the efficiency as a speaker diaphragm is not so altered in any case, such as the
speed of sound is rather lowered and the density is further increased. In the present invention,
electroless plating, silver mirror reaction, etc. are adopted as the chemical plating treatment, and
as the plating metal, metals having high specific elasticity, such as nickel, nickel-tungsten,
chromium, etc. are preferred. . In the case of performing electroless chromium plating, flash
plating of electroless nickel is applied prior to that. The present invention will be described
below. In this embodiment, a speaker vibration made of pulp fiber and carbon fiber,! In the plate,
nickel is bonded between the fibers. In this way, it is advantageous to use a high modulus fiber
such as carbon fiber together with metal fibers etc. in addition to increase the Young's modulus.
70- for carbon fiber with a diameter of 1011, cut by 5 WIIK for a length of 70-, 60-1 for one for
a single decomposition of Kura 7 tovalp, mixed with a sizing agent and a binder, and formed into
a sheet, and heat-formed Thus, a conical diaphragm substrate was obtained. This substrate is
immersed in a 5-methanol solution of 7-enolformaldehyde resin, heated and coined, and then
subjected to electroless nickel plating treatment, so that the entire surface of the carbon fiber and
pulp fiber constituting the diaphragm substrate and their entire bonding portion Nickel was
deposited to a film thickness of about six voices to enhance the cohesion between fibers and the
entanglement effect. Next, the diaphragm substrate is mixed with a foaming agent in a
polymethyl methacrylate solution and immersed in nine solutions, and then heat foaming is
performed to obtain a sealing effect and an internal loss effect to complete a speaker diaphragm
□ did. The wm characteristics of such a diaphragm are shown in the following table in
comparison with those of the reference vibration prepared in the above example, omitting only
the electroless nickel plating treatment. The significance of the chemical plating process is
remarkable in that the speed of sound and the Young's modulus can be remarkably improved
without greatly increasing the density as described above. In the above example, the diaphragm
substrate was formed of pulp fibers and other high modulus fibers, but good results were
obtained when it was formed of only single fibers, ie, only pulp fibers. Thus, according to the
present invention, various effects can be obtained because the fibers are effectively bonded by
chemical meshing of metal by releasing it to a speaker diaphragm provided with a diaphragm
substrate consisting of a single fiber or a plurality of types of fibers. Can be superimposed to
significantly improve the speaker characteristics. Patent Applicant Sanyo Electric Co., Ltd.
Representative Ige Tei EndPage: 2
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