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JPS59193698

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DESCRIPTION JPS59193698
[0001]
TECHNICAL FIELD OF THE INVENTION The present invention relates to a speaker diaphragm. r
Technical background of the invention and its problems] A diaphragm made of a light metal such
as aluminum (A1) or an alloy thereof is a raw material as compared with the one using beryllium
(B,) or boron (B). Because they are inexpensive and easy to form, they are often used as
diaphragms for mid-high range speakers, but their physical characteristics are inferior to those
for loudspeakers, and their Young's modulus [F compared to beryllium or boron, etc. Because the
density is low, the sound velocity (E / P) used as an index of the diaphragm material is small, and
the rigidity value is also small. Therefore, although a speaker unit using a diaphragm made of
aluminum or the like appears split resonance in a low frequency band, this can not be cut off by
the network, adversely affects acoustic characteristics, and has a low frequency in sound
pressure frequency characteristics. A peak may appear or it may appear as deterioration of strain
characteristics. In order to remove this, as shown in Fig. 1 of the fan, a damping agent (2) is
applied by brushing or spraying onto a substrate (1) of a speaker diaphragm made of aluminum
or the like, As shown in the figure, there is one in which the damping member (3) is attached to
the substrate (1), but general K, these damping agents (2) and the damping member (3) It is
important as a plate and can not increase the blowout rate and rigidity, and merely increasing
the internal loss to some extent has led to the disadvantage that the efficiency (output sound
pressure) decreases with an increase in weight. Further, the substrate (1) made of aluminum or
the like itself is low in rigidity, so that the thickness is increased (if it is reduced in efficiency, it is
connected to K). The same applies to the case where the substrate +1) is a synthetic resin. In
addition to this, as shown in the chart, there is also a case where a braking agent (5) containing a
substrate fl) K solid substance (4) is applied by brush or spray, but also in this case, The
improvement in Young's modulus and stiffness was extremely small and not very effective.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-
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mentioned point, and uses an inexpensive and easy-to-form material such as a light metal such as
aluminum or an alloy thereof or a synthetic resin as a substrate of a speaker diaphragm.
However, it is an object of the present invention to provide a speaker diaphragm having excellent
characteristics such as high Young's modulus, light weight, high speed of sound and high rigidity.
[Summary of the Invention] The surface portion of a flake-like inorganic material such as
graphite or mica is made to face at least one surface of the diaphragm for speaker of the present
invention, a light metal such as aluminum, an alloy thereof or a synthetic resin. And laminating
the substrate, the inorganic material, and the inorganic material with each other by a
thermosetting or thermoplastic synthetic resin.
[Embodiment of Invention 1] The speaker diaphragm of the present invention will be specifically
described based on the embodiments shown in the drawings. The speaker diaphragm is shown in
FIG. This speaker diaphragm is dome-shaped, and on the surface on the side of an aluminum
crucible as a substrate with a thickness of about 20 to 100 P, with a flake-like inorganic material
having a thickness of about 5 to 10) & about a thickness smaller than this. Graphite CD (graphite,
graphite) as a material is made to face each other with the surface portions thereof stacked to a
thickness of about 20 to 60 P, and the above-mentioned crucible side and graphite 12 及 び and
graphite CI'l) are thermally cured as a synthetic resin. The flake-like graphite (good) is integrated
with the phenolic resin Gυ, and the flaked graphite (good) is in a state of being aligned with the
substrate [the curved surface shape of the crucible is aligned. In this case, mica (mica) may be
used instead of graphite / 2D as the flake-like inorganic material (The size of the inorganic
material can be appropriately set in the range of about 1 to 20 P, and The substrate is not limited
to the aluminum foil αB, and if it is inexpensive and easy to form, foils made of other light
metals or alloys thereof, and films and sheets made of synthetic resin can be used. The synthetic
resin for integrating the material etc. is not limited to phenol resin (not limited to 3 types, and
other thermosetting synthetic resin such as epoxy resin and imide resin, and further,
thermoplastic synthetic resin such as acrylic resin can also be used. Next, an example of a
method of manufacturing a speaker diaphragm is shown in FIGS. In this case, first, a screenprinted inorganic material (22) is contained at high density by dissolving, mixing, and kneading a
flake-like inorganic material such as graphite and a thermoplastic synthetic resin such as phenol
in an ink solvent. Make 0 ink for printing. In addition, this ink (41) can contain the inorganic
material (c) at a high density as compared with a paint for brush coating or spraying. Then, as
shown in FIG. 3 and FIG. 4, a screen (43 and a squeegee (c)) is used to screen-print the ink
fountain on the surface of the substrate α2 such as a flat aluminum foil prior to molding. Ink
(411 is deposited in a circle. In addition, according to printing, since the ink (41) adheres to the
substrate (13 in a pressurized state, as shown in FIG. 5), the thickness of the adhered ink (4) can
be made uniform and the ink (4I) The inorganic material @ contained at high density is oriented
to some extent. Next, after the printed ink (41) is dried to a certain extent, that is, it does not
adhere to the finger even if it is touched with a finger, the substrate さ れ printed with 0 イ ン キ
ink is given a predetermined shape by the device shown in FIG. And thermally cure the synthetic
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resin 02J contained in the ink 0I) to integrate the substrate (121 and the inorganic material @
and the inorganic material (22 with each other).
That is, the apparatus shown in FIG. 6 is an example of pressure molding, in which the substrate
α2 on which the ink (41) is printed is supported on a mold (4ω) of a predetermined shape, and
the pressure is applied to this mold (G). A mold with four holes (4 .eta. Is placed to hold the edge
of the substrate .alpha. 2 and a high-temperature pressurized gas is injected from the holes into
the upper portion of the substrate .alpha. The pressure is formed along the surface of the
synthetic resin 02 by the expansion of the substrate α 2 at the time of molding and the heating
and pressurization by the high temperature pressurized gas, and the synthetic resin 02 is made
to flow and the flake-like inorganic material It has been accelerated, and furthermore, the
synthetic resin country has become K-set. The apparatus shown in the off view is an example of
vacuum molding, and supports the substrate on which the ink (41) is printed (12 on a hole for
exhaust (49 and a mold 51 of a predetermined shape having a heater 6α), The edge of the
substrate α2 on the mold (51) is held by the holding frame 6z 7 and the air between the
substrate (12 and the mold 51) is exhausted from the holes (4 button, heater 60) In the same
manner as the apparatus shown in FIG. 6, the substrate (121 is molded along the shape of the
mold 59, and, together with this, the flake-like inorganic material is used. The orientation of the
material (company) is promoted to thermally cure the synthetic resin G 熱. During this molding,
the flake-like inorganic material (company) becomes a completely muddy surface like the
graphite of the speaker diaphragm shown in FIG. Then, an unnecessary portion of the peripheral
edge of the substrate α2 is cut away to complete a diaphragm of a speaker cap as shown in FIG.
The speaker diaphragm is not limited to the dome shape shown in FIG. 2 and the sailor cap type
shown in FIG. 8 but may be a cone type as shown in FIG. Then, the flake-like inorganic material
(22 and the ink (41) layer made of synthetic resin or the like may also be provided on the
substrate (the back surface of the substrate 12 as shown in FIG. 10). It may be provided on both
sides of the substrate (12) as shown in FIG. In addition, the ink (41) layer is not only provided on
the entire surface of the substrate 02, but also partially patterned as shown in FIG. 12 to FIG.
(The thickness of the 40 layers may be changed as shown in FIG. 16. Furthermore, as shown in
FIG. 17, the ink (41) layers may be provided in multiple layers. In this case, In the form of flakelike inorganic material (the type, size, density, etc. of the two may be changed, or the type of
synthetic resin may be changed).
The above-described embodiment is an example using the thermosetting synthetic resin 02 or,
even when using a thermoplastic synthetic resin, after promoting molding and orientation by
pressing and heating, it is cooled to room temperature. For example, since the thermoplastic
synthetic resin is cured, it can be applied when the thermoplastic synthetic resin is used as it is.
18 shows the frequency characteristics of the speaker diaphragm of the present invention shown
in FIG. 2 in solid lines, and the frequency characteristics of the speaker diaphragm formed of
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only the material of the substrate, that is, only aluminum, in broken lines. According to this
figure, in the case of the present invention, the peak (α) of the split resonance is suppressed to a
low level to exhibit a generally flat characteristic, and the frequency at which the peak (α)
appears is also enhanced. [Effects of the Invention] As described above, in the speaker diaphragm
of the present invention K, as described above, a flake-like inorganic material such as graphite or
mica is laminated with its face portions facing each other, that is, oriented and laminated. Since
the inorganic material and the inorganic material are integrated with each other by the synthetic
resin, a cheap and easy-to-form material such as a light metal such as aluminum or an alloy
thereof or a synthetic resin is used for the substrate. And the lack of rigidity can be compensated
by layers of inorganic materials and synthetic resins, so that the speed of sound can be increased,
and when the speaker diaphragm has a composite structure and split resonance occurs It is
possible to obtain an appropriate internal loss from pressure that causes internal friction in a
layer of inorganic material or the like, and as a result, an excellent speaker diaphragm exhibiting
flat characteristics to high frequencies. It can be provided to the valence.
[0002]
Brief description of the drawings
[0003]
1 (A) (B) CC5 is a cross-sectional view of a conventional speaker diaphragm, and FIG. 2 is a crosssectional view of an embodiment of the speaker diaphragm according to the present invention,
and has three fangs. Fig. 18 shows an example of the manufacturing method, and Fig. 3 is a
cross-sectional view showing printing of the ink containing the inorganic material and the
synthetic resin on the substrate, Fig. 4 is a plan view of the printed substrate, Fig. 5 The figures
are the enlarged cross-sectional views, the ones (Fig. 6) and the off-figures) are cross-sectional
views showing the molded state of the substrate, respectively. Fig. 8 is a perspective view of the
completed speaker diaphragm. Fig. 11 shows another embodiment of the speaker diaphragm of
the present invention, and Fig. 9 囚, Fig. 10 10, Fig. 11 、, Fig. 16 and Fig. 17 (A) CB) are
sectional views Figure 9 is a perspective view, Figure 12 to Figure 15 is a side view, and Figure
18 is the present invention and the Example is a frequency characteristic diagram of the.
Aluminum foil as a substrate for measurement, (12 · · substrate, (2I) · · · graphite as an inorganic
material, (22) · · inorganic material, 01) · · phenolic resin as a synthetic resin, (most) · middle
synthesis Resin, (41) · · Ink. (C) (A) CB) (B) 572 (A) CB) same wave number (H !, small-7A-
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