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Description 1, title of the invention
Acoustic diaphragm
3. A detailed description of the invention relates to an acoustic diaphragm made of woven or
non-woven fabric made of natural fibers, which is intended to obtain a flat one having a light
weight, a large elastic modulus and a frequency characteristic. is there. In general, the physical
properties required of the diaphragm are that the specific gravity is small, the elastic modulus is
large, and an appropriate internal loss is maintained. Paper is used as the most satisfying
physical property of the acoustic diaphragm in the prior art. This paper had a low specific gravity
and a moderate internal loss, but the elastic modulus was not so large and it was not satisfactory.
Because of this, in recent years, a method of mixing glass fibers, carbon fibers, alumina fibers,
boron fibers, etc. with large elastic modulus with pulp fibers at the manufacturing bite of paper is
adopted, but the elastic modulus is particularly large. The reality is that it has not improved.
Because of this, paper is still used as the mainstream material for acoustic diaphragms. However,
the acoustic diaphragm made of paper can always obtain a constant frequency characteristic due
to the large variation of EndPage: 1 in manufacturing, and it has the disadvantage of being
susceptible to humidity change due to its hygroscopicity. Have The present invention seeks to
eliminate the disadvantages of the prior art such as -L. Hereinafter, the present invention will be
described with reference to FIGS. 1 to 7 of the drawings. First, FIG. 1 shows an embodiment of an
acoustic diaphragm. Reference numeral 1 denotes a cone diaphragm, which is made of inorganic
fiber woven fabric having a thermosetting adhesive layer as a base, and at least one side of this
base is laminated with synthetic fiber or natural fiber woven or non-woven fabric Further, a free
edge 2 is coupled to the cone diaphragm 1 to constitute an acoustic diaphragm. The embodiment
shown here is a free edge type acoustic diaphragm, but may be a fixed type. As the inorganic
fiber woven fabric to be the base material, glass τ>, fiber, carbon fiber, alumina fiber, zirconia
fiber. There are boron fibers and the like, and as a thermosetting adhesive, epoxy resin 1. Those
in the stage of prepreg such as phenol resin, unsaturated polyester resin, melamine resin,
urethane resin are suitable. The thermosetting adhesive layer refers to a state in which the
above-mentioned resin adheres to the fiber surface of the inorganic fiber woven fabric, but is
interposed between the woven cloths. In addition, synthetic or non-natural fibers used for
neminates are woven or non-woven materials such as silk, cotton, flax, wool, rayon, polyethylene.
An inorganic fiber woven fabric base having a thermosetting adhesive layer suitable for fibers
such as polypropylene, nylon, polyester and the like to ensure sufficient elastic modulus and
laminate a woven or non-woven fabric made of synthetic fibers or natural fibers This is
characterized in that the internal loss is appropriately given, and a sufficient frequency band and
sound pressure have become possible. In addition, it is desirable that the woven or non-woven
fabric made of synthetic fibers or natural fibers used for laminating is smaller than the surface
density of the inorganic fiber woven fabric. Examples are shown below. Example 1 A glass fiber
woven fabric having an areal density of 4 o v is impregnated with an epoxy resin to make it into
a prepreg state. As shown in FIG. 2, a polyester non-woven fabric 4 having a surface density of
30 q / rn 'was laminated on both sides of the base material 3 and formed into a cone diaphragm
by a heat press. The physical properties of this diaphragm were: specific gravity p = o, s, elastic
modulus E = 7, 8 × 10 10 dyne / cdi + internal loss tanff = 0.025. The sound pressure-frequency
characteristics of the diaphragm (... Are solid lines shown in FIG. 3 and are remarkably stable in
accordance with the characteristics of the paper diaphragm shown by the broken line. [Example
2] On one side of a substrate 3 made of glass fiber woven fabric to which the same adhesive
layer as in Example 1 is applied, as shown in FIG. Silk cloth 5 on the other side of the surface
density aog / lr? The polyester non-woven fabric 4 was laminated, and a cone diaphragm was
formed by a heating press. The sound pressure-frequency characteristic turned out as shown in
FIG. [Example 3] On one side of a substrate 3 made of glass fiber woven fabric having the same
adhesive layer as in Example 1, as shown in FIG. Silk cloth 6 was laminated and heat-pressed to
form a cone diaphragm. The physical properties of this diaphragm are: specific gravity = 0. =
0.65. The elastic modulus E = 7, 2 × 10 ′ ′ dyne / ,: di, and the internal loss tanc = 0.023.
Also, the sound pressure-frequency characteristic of this diaphragm is as shown in FIG. The
sound pressure-frequency characteristic is obtained by incorporating the diaphragm of each of
the above embodiments into a general speaker and measuring the frequency characteristic with
J15-BOX. Since the acoustic diaphragm of the present invention is configured as in the following,
the specific frequency 9 elastic modulus required as the diaphragm and the three physical
characteristics of the internal loss are all preferable, and a sufficient frequency band and The
sound pressure and the frequency characteristics can be flattened, and the industrial value
EndPage: 2 is high.
4. Brief description of the drawings. FIG. 1 is a half sectional front view showing an embodiment
of the acoustic diaphragm in the present invention, FIG. 2 is an enlarged sectional view of the
main part of the diaphragm, and FIG. Pressure-frequency characteristics of loudspeakers using
Fig. 4, Fig. 4 is an enlarged cross-sectional view of main parts of the acoustic diaphragm in
another embodiment, and Fig. 6 sound pressure-frequency characteristics of loudspeakers using
the same diaphragms. Fig. 6 is an enlarged cross-sectional view of a main part of an acoustic
diaphragm according to another embodiment, and Fig. 7 is a sound pressure-frequency
characteristic diagram of a speaker using the same diaphragm. 3 · · · · · · · · Base material, 4 · · · · · ·
· · · · · · · · · · · woven fabric. Name of agent Attorney Nakao Toshio and others 1)-)) Figure 1 Figure
2 Δ recommendation yLIIL (H JEndPage: 3
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