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Description 1, title of the invention
Material for audio equipment
3. Detailed Description of the Invention The present invention provides a material for an acoustic
device which is suitable as a speaker, a diaphragm of a microphone, or a cantilever, a tone arm, a
head shell or the like of a pickup cartridge. Generally, diaphragm, cantilever, tone arm. Materials
that make up the head shell and the like are required to be lightweight, have high rigidity, and do
not cause partial resonance. That is, of the physical properties of the material, it is necessary that
low density, high 2 and elastic modulus are required and that the processability is good.
Conventionally, aluminum alloys and titanium alloys are mainly used as materials for acoustic
devices of this type, and some of them are made of beryllium, boron or a composite material in
which these are structurally combined. Although the above aluminum and titanium have good
processability and low material cost, they have to be thin-walled in order to reduce the mass, and
therefore there is a disadvantage that the rigidity becomes insufficient, and beryllium, Boron has
a low density and a high modulus of elasticity and is excellent as a material for acoustic devices,
but has poor processability and has the disadvantage of requiring complicated processes and
expensive equipment. Thus, conventional acoustic device materials have not been able to satisfy
all the characteristics. The present invention eliminates the above-mentioned conventional
drawbacks, and provides a material for an acoustic device having a low density, a suitable elastic
modulus, and a light weight and a high rigidity. The feature of the present invention resides in a
material for an audio device EndPage: 1 made of an aluminum Aj2 alloy containing 10 wt% or
more of lithium Li, and the content of lithium Li is preferably in the range of 18 to 25 wt%. The
lithium Li has a density S of 0.63 and is the lowest density among metals. FIG. 1 shows an
apparatus for producing the material for audio equipment of the present invention. In FIG. 1, 1 is
a vacuum furnace, 2 is a crucible containing a specified amount of aluminum AR, lithium Li and
other trace amounts of additional elements, 3 is a heating element disposed on the outer
periphery of crucible 2 and 4 is an exhaust After exhausting the air in the vacuum furnace 1 at
10 "-10 'Torr, introduce inert gas such as dried Nz and Ar into the vacuum furnace 1, and remove
the crucible under a reduced pressure of 10-2 to 1 Torry. After raising the temperature of 2 to
680 to 750'c and sufficiently stirring the dissolved aluminum AQ, lithium Li and the like, it is
cooled to form an AQ-Li intermetallic compound. After cooling, roll this ingot. As a result of
examining the pressure at the time of dissolution, etc. by various experiments, it was confirmed
that the production of a good Aff-Li / 'intermetallic compound was roughly performed under the
above-mentioned conditions.
For example, if the exhaust is insufficient and the residual amount of air is large, or if the drying
of the inert gas introduced after the exhaust is insufficient, lithium Li may be dissolved with
oxygen or moisture remaining in the atmosphere during dissolution. There was a phenomenon
that they reacted, ignited, or formed white powder on 5 surfaces. In addition, various contents of
lithium Li were changed to prepare a sample, and as a result of evaluation by the elastic modulus
of this sample, the maximum value was obtained when the content of lithium Li was 18 to 25
wt%. The physical properties of the AQ-Li gold metallization compounds thus produced are
shown in the table below in comparison with AJTi, Be, B. As described above, the AQ-Li
intermetallic compound of the present invention has a low density of 1,725 and an elastic
modulus larger than that of AQ, so that an unprecedented lightweight, high-specific elastic
modulus material can be obtained. It is a thing. FIG. 2 shows a speaker a using an AQ-Li
intermetallic compound according to the present invention and aluminum. The sound pressure
frequency characteristics of a conventional speaker b using a diaphragm made of magnesium
and silicon and a corrosion resistant aluminum alloy are shown. According to the speaker using a
diaphragm made of the Aff-Li intermetallic compound of the present invention Due to the
difference in the physical properties, the conversion efficiency of electricity / sound 18 is
improved, and the high resonance frequency fH can be moved out of the high audio frequency
band. In addition, when the AQ-Li intermetallic compound of the present invention is used for a
tone arm, a cantilever, etc., the resonance frequency in the low region can be made an optimal
value of 1 o to 15 Hz, and it has an advantage that partial resonance can be eliminated. It is.
4. Brief description of the drawings FIG. 1 is a schematic view of an apparatus for producing a
material for acoustic equipment of the present invention, and FIG. 2 is a sound pressure
frequency characteristic of a speaker using a diaphragm made of the material for acoustic
equipment of the present invention. FIG. 1 ииииии Vacuum furnace, 2 иии-crucible, 3
Heating elements. 4 иии Exhaust system. Name of Agent Attorney Nakao and 1 other EndPage: ?
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