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JPS5779795

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5779795
Sound material as claimed in the invention Sound material characterized in that it is made of
compressed foam metal.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic
material suitable for use in, for example, a diaphragm of a speaker, a voice coil bobbin, a speaker
box or the like, and in particular, to improve sound quality. An embodiment applied to an
imaging plate of a loudspeaker according to the present invention will now be described with
reference to FIGS. 1 and 2. FIG. FIG. 1 shows the moving plate (1) of the speaker of this example,
and FIG. V shows the plate material (2) made of, for example, aluminum foam metal, which is the
base material of the moving plate (1). ing. Here, the foam metal refers to a metallic material
having a cancellous structure having a three-dimensional uniform network. The plate material (2)
has a thickness of, for example, 2 to 5 u. In order to obtain the diaphragm fil from this plate
material (2), for example, gold not shown under normal temperature and pressure of several 10
to several 10 ktr / cm 2 It may be molded by a mold. In this case, the thickness of the diaphragm
(1) is set to be 30 μm to LOmK. In addition, the plate material (2) may be rolled and then
formed, or may be hot pressed to a temperature of 500 ° C. When hot pressing is performed,
there is an advantage of eliminating internal distortion. With such an imaging plate fil, the
Young's modulus E was 10 to 15 × 10 9 N / m. Also, the value of Q is 28 to 45, and the density
is 1.3 g / cl! Lになった。 Conventionally, when an aluminum foil is press-formed to constitute a
video pickup plate of a speaker, the density is as large as 2.7 g / CIIL, and the Young's modulus E
is as small as about 7 N / m 2. It was difficult to remove the co-digging frequency out of the
working frequency band of the speaker. In addition, since the Young's modulus E is small, the
flexural rigidity can not be sufficiently increased, which causes a problem in faithful sound
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reproduction. Furthermore, there is also a disadvantage that the high frequency band can not be
sufficiently attenuated because the value of Q is for example 200 or so. Also, when the moving
plate of the speaker is conventionally made of foam metal and EndPage: 1, metal foil such as
aluminum foil is stuck as the sealing layer, so the operation is complicated and the density as a
whole is further increased. As a result, the speed of sound has become slow, and it has been
difficult to bring the split and seize frequency out of the use frequency band of the speaker. In
addition, the pupil of Q is increased by the amount of the metal foil, and it is difficult to
sufficiently suppress the high frequency resonance. Furthermore, in the case where the imaging
plate of the speaker is made of paper or made of synthetic resin, there is a problem in terms of
bending rigidity since both Young's modulus E is small, and in the latter case the density is also
large. It was not satisfactory also in the point of sound velocity.
According to the acoustic material of the present invention, since the Young's modulus E is large,
the value of Q is small, and the density is small, the acoustic characteristics can be extremely
improved. In particular, in the diaphragm of the speaker of this example, since the Young's
modulus E is large, the bending rigidity can be made sufficiently large, and one-if reproduction
can be faithfully performed. In addition, since the Young's modulus E is large and the density can
be small, the sound velocity can be large. As a result, it becomes easy to remove the speaker from
the use frequency band of the divided and held frequency. Furthermore, even if there is a high
frequency resonance, this can be sufficiently attenuated because the value of Q is small. And,
from the point of view, the sound quality is extremely improved. In this example, a cone-shaped
imaging plate ti + is mentioned as an example, but the shape of the imaging plate may be a dome
shape, a balance drive type or the like, or it may be applied to the skin layer of a flat drive
diaphragm. Good. Further, although in this example the aluminum foam metal plate material (2)
is used, it is also possible to use a foam metal plate material of nickel, magnesium or an alloy
thereof (aluminum oxide). The use of the pond of the acoustic material according to the invention
will now be described. FIGS. 3 and 4 each show another example of use. In FIG. 3, the acoustic
material of the present invention is applied to the voice coil bobbin (3), and in order to obtain a
weir (3) on such a voice coil bobbin, as shown in FIG. The plate material (2) is molded at a
pressure of several tens to several hundreds kf / cIL2. In this case, the thickness of the voice coil
bobbin (3) is about 30 μ to 1.0 fi. する。 (4) in FIG. 3 is a voice coil bobbin. Further, in FIG. 4,
the acoustic material of the present invention is applied to each member constituting a speaker
system (5), in which (6) is a speaker box, (7) is a baffle, (8) hashful full, +91 , Gα and (111
indicate the speakers, respectively. These respective members (6) to (111) are obtained in the
same manner as in FIG. 1 and FIG. For example, in order to obtain the frame (9a) of the speaker
(9) as shown in FIG. 5, for example, a foamed metal plate material (2) having a thickness of 5 to
20 m as shown in FIG. In this case, the thickness of the frame (9a) should be about 2 sieves. It
will be readily understood that the same operational effects as those of FIG. 1 can be obtained
also in such FIG. 3 and FIG. 4 examples. Here, what kind of points are more specifically explained
by such action and effect will be described in more detail.
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-In the example of FIG. 3, the harshness of natural sound disappears as the value of Q decreases.
On the other hand, in the case of the conventional voice coil bobbin made of synthetic resin or
metal, since the value of Q is large, it was not possible to sufficiently suppress the generation of
the natural sound. Further, in the example of FIG. 3, it is possible to obtain excellent
characteristics in terms of the electroacoustic conversion efficiency and the heat resistance as
compared with the conventional voice coil bobbin. That is, while heat resistance is insufficient
with conventional paper or synthetic resin voice coil bobbins, since it is made of metal in the
example of FIG. 3, extremely excellent heat resistance is realized by adding its heat radiation
effect. it can. In addition, the conventional metallic voice coil bobbin tends to be heavy because of
its high density, and as a result, the efficiency is poor, whereas the density is low in the example
of FIG. 3 to improve the efficiency. be able to. Further, in the example of FIG. 4, since the value of
Q is small, the natural sound can be eliminated. On the other hand, when the three beaks were
made of aluminum plate or aluminum / J-icatos as before, the characteristic sound could not be
suppressed sufficiently because the value of Q was large. Further, in the example of FIG. 4,
EndPage: 2 can be used to improve mechanical strength in comparison with conventional
speaker boxes, baffles and the like. That is, although the speaker box was previously constituted
of an aluminum plate, aluminum, die casting or the like in this case, in this case, the density is as
large as 2.7 g / cwi3 for an aluminum plate, for example. It was not possible to obtain sufficient
rigidity (the rigidity is proportional to Et3). Here, E is Young's modulus and t is thickness. On the
other hand, in the example shown in FIG. 4, since the density is small, the thickness can be
increased within the same weight range, and as a result, sufficient mechanical strength can be
obtained. It will be readily understood that the acoustic material of the present invention can be
applied to the player's cabinet. Also, the acoustic material of the present invention is not limited
to the above-described embodiment. Of course, various configurations can be taken without
departing from the scope of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view showing one
embodiment of the acoustic material of the present invention, FIG. 2 is a cross sectional view for
explaining the present invention, and FIG. 3 is a cross sectional view showing another use
example of the present invention. FIG. 4 is a front view showing another example of use of the
present invention, and FIGS. 5 and 6 are cross sectional views for explaining the present
invention. fi + is a diaphragm of the speaker, and (2) is a plate made of foam metal. -9-5 Douguru
Sugiura C-2 '-) 3i co () EndPage: 3
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