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Description 1, title of the invention
Speaker diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
diaphragm having a laminated bridge whose core is a hollow sphere. In general, the
characteristic of being flooded with respect to a speaker imaging plate is that it is lightweight,
has a large elastic modulus, a large rigidity, and has an appropriate internal loss. However, in
general, the elastic modulus and the internal loss are contradictory. That is, materials with high
elastic modulus have small internal losses. In order to solve this problem, synthetic resin foams
have been used to bond a synthetic resin foam to a sheet metal foil in which high elasticity fiber
is mixed with natural pulp using a bonding agent, but with these, some improvements have been
made. It will be done. It has not been solved essentially. The object of the present invention is to
create a lightweight, high-stiffness diaphragm in consideration of the above-mentioned point,
shift the high-frequency contact point to a higher frequency side, and widen the piston motion
range. There is to provide be a force. Conventionally, a metal mesh diaphragm has been proposed
for this purpose. However, the metal diaphragm has a high density, and by thinning the vibration
hardness is proportional to the eighth power of the thickness. The divisional movement is
produced at a low frequency, and if it is thickened, the weight of the diaphragm is increased, and
as a result, the efficiency is lowered and the original purpose can not be achieved. An object of
the present invention is to provide a lightweight and highly rigid vibrator to solve these
drawbacks. The features of the present invention are as follows: hollow EndPage of inorganic or
organic substance as a core between thin plates of metal such as aluminum or glass reinforced
plastic (FRP): Filled with narrow spheres and hollow spheres and hollow spheres and elastic
modulus after curing. It is intended to obtain a lightweight high-till diaphragm by integrating
using an adhesive that becomes large.
Speaker diaphragm
Hereinafter, the present invention will be described in detail with reference to the drawings. 1
and 2 show an embodiment of the present invention, which is a diaphragm having a laminated
structure. FIG. 1 is a cross-sectional view in the direction perpendicular to the diaphragm surface.
(1) is thickness 0. L (2), which is a cone formed by molding an aluminum alloy plate of Him, is an
epoxy hollow sphere having an outer diameter of 2υ, and (3) is an epoxy adhesive. FIG. 2 is a
cross-sectional view parallel to the diaphragm surface, and the epoxy hollow spheres (2) are
filled so as to form a close-packed light-filled structure on a plane. When vibration is applied to
the diaphragm, the hollow sphere receives a compressive force and the metal cone receives a
compressive force and a tensile force. However, the hollow spheres are strong against
compression as is well known, and the gold cone is strongly bonded at the point of contact with
the hollow spheres. Therefore, the apparent elastic modulus is increased. However, as can be
seen from the figure, the inside of the diaphragm has a large number of voids and a small
density. Conventionally, a method has been proposed in which a viscous substance mixed with
micro hollow spheres is sandwiched between metal plates, but the density can be reduced by this
method but each hollow sphere does not contribute to increase the elastic modulus in a floating
state. 9. The thickness of the diaphragm of the above embodiment is 2.81 kl and the density is
0.85 f / all. Ox10111dyne/cdであった。 A conventional diaphragm with the same
basis weight (800 '/ m') as this diaphragm, that is, elastic modulus by the same measurement
method of natural pulp (NLIKP 21 ° SR), carbon fiber mixed pulp, aluminum, titanium and
beryllium The specific modulus of elasticity and curvature are as shown in Table 1 in comparison
with the hardness and those of this example. (Table 1) FIG. 8 is a sound pressure frequency
characteristic of a sneaker using the diaphragm for a large diameter low sound speaker of this
embodiment. In the figure, curve h (4) is a conventional natural pulp diaphragm, and curve 2 (m)
is a carbon fiber mixed diaphragm 2 curve @ (6) is a diaphragm according to this embodiment.
According to the present invention, the piston 7 motion area can be greatly expanded as
compared with the conventional diaphragm. As the core material in the present invention, it is
desirable to use epoxy hollow spheres, glass hollow spheres, etc. that are completely hollow
spheres, but use non-perfect hollow spheres, silica hollow spheres, shirasu hollow spheres, etc.
The same effect can be obtained also with the vibrating plate. . In addition, by changing one of
thin sheet ai type, thickness, hollow sphere m type, size, adhesive agent #) The elastic modulus
and curvature of individual pieces can be made of thin material and a diaphragm meeting the
purpose The additional Ori point that can be obtained is also obtained.
The adhesion method is 1. A method of coating a fusible adhesive in advance directly on a hollow
body surface, coating a thin plate with an adhesive and applying heat to a thin plate during
heating press to roll the hollow spheres on the thin plate to make an adhesive There is a method
of applying In the case of the hollow sphere used in the present invention, when the outer
diameter is 0.1 uφ or less, the proportion of voids decreases as can be seen from FIG. 1, and the
density can not be reduced sufficiently and the effect is small. Therefore, a hollow sphere having
an outer diameter of 0.1 Uφ or more is suitable.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of the laminated diaphragm of
the present invention in the direction perpendicular to the diaphragm surface, FIG. 2 is a crosssectional view of the N diaphragm surface and EndPage: 2 parallel direction, The figure compares
sound pressure frequency characteristics using a conventional diaphragm and the diaphragm of
the present invention. In the figure, (the crucible is a thin plate, (2) is a hollow sphere, and (3) is
an adhesive. Agent Shinno-EndPage: 3
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