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JPS5439623

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DESCRIPTION JPS5439623
Description 1, title of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention is to provide a speaker diaphragm
which is rich in productivity and capable of expanding the high frequency band limit frequency.
Conventionally, films such as polyester and nylon, paper processed with natural fibers and
chemical fibers, metal foils such as aluminum and titanium, etc. are mainly used as high-range
diaphragms for speakers, but each has a long length. -It is short and not satisfactory as a
diaphragm material. The fiber diaphragm has no mechanical resonance due to the friction
between fibers, but does not cause sharp resonance, but has the disadvantage that the specific
elastic modulus is small and it is easily affected by humidity. Also, for metal foils, although the
specific modulus is relatively high, steep resonance appears because the internal loss is small.
There are drawbacks such as the generation of distortion due to non-linear motion at the time of
large amplitude. In general, as the diaphragm material, it is preferable to have high rigidity, high
elasticity, light weight, and appropriate internal loss and damping factor, but since these
characteristics have mutually contradictory elements, the existing Satisfying everything with
materials is nearly impossible. In addition, titanium, aluminum, etc., which are usually used as
metal diaphragm materials, are mechanically strong and have a relatively high specific elastic
modulus, but they are sufficient when viewed as a speaker diaphragm There is a need for one
having a higher specific modulus, not one. For this purpose, it was characterized in that a boron
layer having a high specific elastic modulus was formed on one side or both sides of a titanium,
aluminum or nickel foil by using a physical vapor deposition method or a chemical vapor
deposition method. High performance swing EndPage: 1 Moving plate material is beginning to be
developed. However, the diaphragm has poor productivity and also. -It has disadvantages such as
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high cost and is not sufficiently satisfactory from the industrial point of view. The present
invention solves the above-mentioned conventional drawbacks. The feature of the present
invention lies in coating a diaphragm substrate with a resin in which boron powder or boron
compound powder is mixed, which results in low cost. The present invention provides a new
loudspeaker diaphragm having high specific modulus and high productivity. Boron and boron
compounds are very light weight and have high specific elastic modulus which can not be
obtained with other materials, but they have poor processability and are mechanically weak, so
they are used alone as diaphragms It is impossible. On the other hand, conventionally, it is widely
used as a metal material 9 alloy material in general. チタン、アルミニウム。 Nickel and the like
have high specific elastic modulus and rigidity, and are also rich in ductility, so they are suitable
as a speaker diaphragm, but in order to obtain excellent acoustic properties, they have a higher
ratio It is desirable to have a modulus of elasticity.
Therefore, the present invention mixes a powdered boron or boron compound with a resin and
coats these on a diaphragm substrate consisting of a thin film, paper, cloth, metal foil or the like
to obtain a high specific elastic modulus. In some cases, the high limit frequency fH of the
diaphragm is raised to be outside the audible band, and the piston band (the flat portion of the
sound pressure frequency characteristic) is expanded to obtain a balanced sound quality. The
speaker diaphragm of the present invention can achieve ultra-high elastic modulus and
mechanical strength far exceeding conventional materials. In addition, a speaker diaphragm has
been proposed in which a boron layer having a high specific elastic modulus is formed on one
side or both sides of a metal foil by using a physical vapor deposition method or a chemical
vapor deposition method. When the diaphragm and the diaphragm of the present invention are
compared, there is almost no difference in specific modulus and material properties, but one
advantage according to the present invention is that productivity is good and cost is low. It is
sufficiently satisfactory when viewed industrially. Hereinafter, the details of the present invention
will be described with reference to the drawings and examples. 1 and 2 each show a crosssectional view of an embodiment of a speaker diaphragm according to the present invention. As
shown in FIG. 3, this speaker diaphragm is obtained by coating the mixed viscous liquid 2 on one
side or both sides of the diaphragm substrate 1, and the mixed viscous liquid 2 has a particle size
of one particle. The 1 to 1 o () μm is obtained by mixing any boro / or boron compound powder
2 a with the coating resin 2 b. As the coating resin 2b, epoxy resin, urethane resin, varnish resin
and the like can be used. In these cases, it goes without saying that diaphragms having different
characteristics can be obtained depending on differences in the thickness of the diaphragm
substrate 1, the size and amount of boron or boron compound 2a, the type of coating resin, the
thickness of the coating layer, etc. Yes. [Implementation f111] Titanium substrate 20J! A mixed
viscous liquid of boron powder (particle size 1 to 50 μm) and epoxy resin is coated on one side
of a metal foil of Jm. Example 2 A mixed viscous liquid of boron powder (particle diameter 1 to
50 μm) and an epoxy resin is coated on both sides of a metal foil of 20 μm on a titanium
substrate. EXAMPLE 3 A mixed viscous liquid of boron powder (particle diameter 10 to 507 tm)
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and epoxy resin is coated on one side of a metal foil of 20 .mu.m on an aluminum substrate.
[Example 4] On both sides of a metal foil of aluminum substrate 20 μm. A mixed viscous liquid
of boron powder (particle diameter 10 to 5 μm) and epoxy resin is coated.
The above embodiments are shown in the following table in comparison with the prior art.
According to the present invention as in EndPage: 2 or more, the specific elastic modulus is
significantly improved as compared with the conventional speaker diaphragm using titanium foil
or aluminum foil. The present invention is advantageous in terms of manufacture as compared
with the prior art in which boron is deposited by vacuum deposition on both sides of a 20 / jm
thick titanium foil. That is, in the conventional example by the vacuum evaporation method, the
number of processes per one process is limited because it is performed separately in the vacuum
evaporation vessel, and the productivity is poor. Also, there is a drawback that boron can not be
used effectively because it adheres to the surface. On the other hand, it is sufficient to coat the
diaphragm substrate with a viscous liquid containing boron or boron alloy powder as in the
present invention, which has an advantage that the productivity is good and the boron material
can be used without waste. FIG. 4 shows sound pressure frequency characteristics of a speaker
using the speaker diaphragm of the present invention and the conventional speaker diaphragm.
In FIG. 4, A indicates a conventional example using titanium foil, B indicates a conventional
example in which boron is deposited on both sides of titanium foil, and C indicates the
characteristics of a loudspeaker using the speaker diaphragm of Example 2 of the present
invention. According to the present invention, the high frequency band limit frequency is greatly
improved as compared with the one using the conventional metal foil moving plate, and therefore
the sound pressure frequency oversize 7 in the audible band is flat. The present invention has the
above-described configuration. According to the present invention, the high frequency band limit
frequency is significantly improved, and the sound pressure frequency characteristic in the
audible band becomes flat to the high frequency band. The speaker diaphragm has an advantage
of being obtained with high productivity.
4 Brief description of the drawings FIGS. 1 and 2 are cross-sectional views of the speaker
diaphragm in the embodiment of the present invention, FIG. 3 is an enlarged cross-sectional view
of FIG. 2 and FIG. It is a sound pressure frequency-characteristics figure of a speaker using the
diaphragm for speakers of the invention, and the conventional diaphragm. 1 · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · mixed body of liquid, 2a · · · · · boron (or boron compound) powder, 2b · · · · · ·
· · ·. Name of agent Attorney Nakao Toshio and others 1 person ・ ・ ・ ・ Fig. 1 Fig. 2 Fig. 4 →
→ Soft page End Page: 3
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