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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a vibration system of
a speaker, and FIGS. 2 and 3 are cross-sectional views of a vibration system material of the
present invention. 1 ...... speaker vibration system, 20 ...... vibration-based material, 21 ......
alumina fiber, 22 ...... plastic.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration system
material of a speaker. The vibration system of the speaker is composed of a voice coil bobbin, a
diaphragm, a center cap, a damper, and the like. These common materials are vegetable fibers
such as paper. Recently, however, their bobbins, especially voice coil bobbins, are made of carbon
fiber. This is effective to improve the heat resistance and to increase the thermal tolerance of the
speaker. However, if the bobbin is made of a carbonaceous material, the electrical insulation with
respect to the bobbin coil wound around it is not sufficient and a short circuit accident is likely to
occur. Such problems also occur between other vibration system members and lead wires and
other metal parts. Therefore, the object of the present invention is to form part of the vibration
system "l ++ 7 C-) 0 material with a new fiber material, eliminate the drawbacks of the prior art,
and simultaneously solve the sound technical problem. It is like that. Here, the new material is
alumina fiber, and the vibration-based material of the present invention is characterized in that
the alumina fiber is in the form of a woven fabric or a non-woven fabric and is combined with a
plastic to form this. Hereinafter, the present invention will be specifically described based on one
implementation shown in the drawings. First, the IEI diagram shows a vibration system l of an
electrodynamic speaker. The voice coil 8 is wound around the outer periphery of the bobbin 2,
and the diaphragm 4 and the center cap 5 are attached to one end of the bobbin 2, and the lead
wire 6 of the voice coil 8 is attached to the outer surface of the bobbin 2 and the diaphragm It
connects to the tinsel wire 7 of the outer side of the diaphragm 4 through the inner surface side
of. Further, the diaphragm 4 is supported by the damper 9 on the frame 8 fixed to the bobbin 2
and the diaphragm 4 so as to be able to vibrate on the frame 8 by the edge 10. Of course, the
voice coil 8 is located between the magnetic gaps (21h 471 ° 12) of the magnetic circuit 11.
Here, in the drawing, the portion of the imaginary line represents the portion other than the
vibration system l. And, as shown in FIG. 2 and FIG. 8, the vibration system material 20 of the
present invention is configured by impregnating alumina fiber 21 with plastic 22. The alumina
fibers 21 are in the form of a woven fabric, non-woven fabric or in the form of a beret, and the
plastic 22 is mainly made of thermosetting 4 and is impregnated into the entire structure of the
alumina fibers 21 or only on the − surface and cured. The heating and compression in the semicured state are effective to form the perturbation based material 20 into a desired shape and to
make it thin and dense.
However, the shaping step may be performed on the alumina fibers 21 prior to the impregnation
step. First, the vibration-based material 20 of the embodiment of FIG. 2 is an example in which
plastic 22 is sufficiently impregnated into a woven fabric of, for example, a plain weave of
alumina weave @ 21. The one in this embodiment has uniform physical properties in the
longitudinal and transverse directions due to the woven structure. Next, the vibration-based
material 20 of FIG. 8 is a non-woven fabric 18, 7,..., 0, and 0 is an embodiment in which the
strand-like alumina fiber 21 is thinly impregnated with the plastic 22. The physical properties in
this case will be directional in the direction of the strands. Of course, the alumina fiber 21 may be
used as a sheet-like non-woven fabric in a non-oriented state as a suitable short fiber. The
vibration-based material 20 of the present invention may be composed of at least an alumina
fiber 21 and a plastic 22, and may be combined with other reinforcing materials to constitute a
composite material. The vibration system material 壷 t1 of the present invention brings about the
following specific effects. Elasticity approximately equal to that of the il + carbon * # composite
material can be obtained, and weight reduction can be achieved. As a result, since the vibration
system component I.sub.i becomes thinner, the driving force can be enhanced if the magnetic gap
is narrowed. (Because the self-attenuation characteristics are larger than general metals and
lower in visco-elasticity, the sound transmission characteristics are excellent, and the
phenomenon of divided vibration is reduced, so that the reproduction of sound is obtained as
close to the original sound without distortion. . <4) The heat resistance temperature is about
1800 C, so the heat resistance temperature of the voice coil can be sufficiently sustained, so that
the human power limitation of the speaker due to the heat generation temperature can be solved.
(4) The adhesion of alumina fibers to plastic is good and the acid resistance is good, so there is
no vibration peeling and the durability is excellent. Since the 15+ material is electrically
insulating, a short circuit between the vibration system component and the voice coil or lead wire
can be reliably (-prevented). In particular, when this vibration-based material is used for a
bobbin, the AC magnetic flux of the voice coil can not generate an eddy current in the portion of
the bobbin, so that an eddy current distortion like a bobbin of a conductive member can be
improved. Since the above effects leave the functional range of the material itself and act
effectively on the acoustic characteristics, the present invention provides a useful speaker
vibrating material.