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Description 1, title of the invention
Acoustic diaphragm
3. Detailed Description of the Invention The present invention relates to a diaphragm for an
electroacoustic transducer such as a speaker. Conventionally, paper fibers are generally used as
the acoustic diaphragm material, and other plastic and metallic diaphragms are also used, and
particularly, metal foils such as aluminum are used as the high-tone speaker diaphragms. . The
cone made of paper fiber has appropriate rigidity, and light has a large sound velocity, but there
is almost no internal loss, so it is necessary to bond, for example, a visco-elastic film, and it is
necessary to fully demonstrate its performance as a diaphragm. I can not In addition, even if such
a treatment is performed, there is a drawback to the left that causes resonance in the high range.
Plastic films are inferior to paper fibers in both speed of sound and loss. An object of the present
invention is to provide a diaphragm having a large sound velocity and a large internal loss,
except for the drawbacks of the conventional diaphragm. The acoustic diaphragm of the present
invention is formed by bonding and integrating a flaky glass powder base with an organic binder.
The speed of sound of glass varies depending on its composition, but is generally as high as 600
o to ersoom / s. However, it is not suitable to use the glass itself as an acoustic diaphragm, in
view of its small internal loss and easy breakage. In the present invention, a flake-like glass
powder is used as a base material, this glass powder is laminated in layers, and each layer is
bonded by an organic bi-layer EndPage: 1 bond, so that the internal loss is large at the same
speed of sound as glass A diaphragm can be realized. The 7 rake glass used in the present
invention is a glass material processed into flakes of flakes, and the shape of the flakes is
preferably as thin as possible in the thickness direction and long in the length direction, and their
ratio The aspect ratio is preferably at least 50 or more. The actual particle size in the long
diameter direction is in the range of 60 mesh to 400 knot, preferably in the range of 150 mesh
to 300 mesh. The glass material and the glass composition thereof are closely related to the
characteristics of the diaphragm, and are preferably compositions having a large elastic modulus
and a small density. Glass flakes are oriented in one direction by forming into sheets, cones,
domes and the like. By subjecting the assembly obtained in this manner to the assembly “V”,
“′ ′ ′ ′ Es & it,“ 1 ′ ′ 7 L ′ ′ ′ E 7 f−kW ′ ′, the target diaphragm can be
obtained. Since the elastic modulus, density and loss related to the acoustic characteristics of the
diaphragm thus obtained are related to adhesion strength between the glass and the binder, the
content of the binder, internal loss of the binder, etc. It is important to select the content from
these points of view.
As a way to increase the elastic modulus and increase the speed of sound. It is effective to treat
the surface of the glass flake in advance with a silane coupling agent or the like to strengthen the
adhesion to the binder. In order to increase the internal loss, it is extremely effective to mix
asbestos fiber powder into glass flakes as the third component, in addition to the selection and
addition amount of the binder resin. However, in this case, although the speed of sound
decreases although the internal loss increases, the addition ratio thereof is preferably in the
range of 6 parts by weight to 100 parts by weight of asbestos fiber powder with respect to 1 part
by weight of flake glass powder. Moreover, as a shape of this asbestos powder, a thing with a
fiber diameter of about 0 to 1 to 5 μm and a fiber length of about 0.5 to 3.0 gives preferable
results. Next, as the binder, a thermosetting resin such as an epoxy resin, a thermoplastic resin
such as polymethyl methacrylate resin, a rubber binder, a polyurethane rubber, etc. may be used
according to the characteristics of each purpose. it can. Hereinafter, the present invention will be
described in more detail in the examples. EXAMPLE 1 A flake-like glass powder (having a
thickness of about 1 to 6 pm and a length direction of about 6 oo μm) having a glass
composition was formed into a sheet to obtain a flake glass laminated sheet. A resin obtained by
mixing and dispersing 3 parts by weight of boron trifluoride monoethylamine as a curing agent
in 100 parts by weight of an epoxy resin (shell petrochemical product "epi coat 828") is
impregnated to a content of 166 parts by weight. Use a flat mold. One heat curing was carried
out at 160 ° C. for 40 minutes under about 5014 / ca (7) pressure conditions, and then
removed from the mold to obtain a diaphragm at 1'65 ° C. The results are shown in the table
below. Example 2 With respect to 100 parts by weight of the same flaky glass powder as used in
Example 1, 100 parts by weight of asbestos fibers with a fiber diameter of about 0.2 μm and a
fiber length of about 1 WIM. Add 60 parts by weight, 26 parts by weight, and 6 parts by weight,
add and mix, mix well, disperse, and then make each into a sheet by the same method as in
Example 1 to obtain a glass-asbestos mixed sheet laminated board The The same binder as in
Example 1 was impregnated in the same amount, molded and thermally cured under the same
conditions as in Example 1 to obtain a sheet-like diaphragm. The characteristics of these were
measured in the same manner as in Example 1. The results are shown in the table below.
Example 3 The surface of the same flaky glass powder as used in Example 1 was previously
treated with a silane coupling agent (Shin-Etsu EndPage: 2 Silicone Co., Ltd. product rKBM 403J)
and then formed into a sheet by the same method as in Example 1, Thereafter, a sheet-like
diaphragm was formed under the same conditions as in Example 2.
The results of the characteristics measured by the same method as in Example 1 are shown in a
table. In the above embodiments, flaky glass powder having a sound velocity of about rs4oom /
secζA glass is used, but by using a glass substrate having a further high sound velocity2 a
diaphragm having a larger sound velocity can be realized. I can wait for it. The characteristics of
the cone paper and the metal aluminum plate used in the speaker diaphragm of a single run as a
comparative example were described. (The following margins)-) The acoustic diaphragm of the
present invention is one as seen in the table above. The speed of sound is about twice that of
conventional cone paper. It shows characteristics close to aluminum, while the sharpness of
resonance Q has a large internal loss, about 1/10 of aluminum. It has a very excellent
characteristic as a diaphragm. The result of having incorporated the diaphragm of this invention
in the speaker. It has been confirmed that the primary resonance moves to the high frequency
side compared to the conventional cone paper, the divided vibration disappears over a wide area,
and a smooth reproduced sound with less distortion is obtained. As apparent from the above
description, the acoustic diaphragm of the sixth invention is made of a novel material and has
excellent acoustic characteristics. . Representative Mr. Toshio Nakao and one other person named
Patent Attorney) EndPage: 3
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