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[Industrial field of application] The present invention relates to a vibrating member for acoustic
equipment such as a diaphragm for a speaker and a diaphragm for a microphone. [Prior Art]
Conventionally, various vibration members for audio equipment, for example, diaphragms
formed by heating and pressing light metal foils such as AI, T i and Mg as diaphragms have been
variously devised as diaphragms for high-pitched sound reproduction speakers. Have been
served. [Problems to be Solved by the Invention] Such a conventional diaphragm needs to be
formed into a foil before being formed into a diaphragm shape, which requires expensive
equipment such as a rolling mill, and the rolling Since the processed foil has so-called
directionality in which crystals are arranged in one direction, the defect that the forming process
to the shape of the diaphragm becomes difficult later and the physical property of the diaphragm
becomes uneven, which causes problems in acoustic characteristics Also had. [Means for Solving
the Problems] The present invention is formed of an amorphous thin plate obtained by ultraquenching a melt of a Ti-based alloy containing at most 40 at% of St, at most 20 at% of B and the
balance Ti. It is a vibration member for audio equipment. [Embodiment] The embodiment in
which the present invention is applied to a diaphragm will be described. (I) Ti 9.8 at%, Si: 12.7
at% and B near, 3 at to 5g Ti base alloy consisting of 5 at% It heats and melts (the holding
temperature is about 1600 ° C.) by a floating melting method using a high frequency. A
quenching roller formed of a material having a large heat capacity such as copper is disposed
vertically below the high frequency induction coil, and quartz glass having a slit with a width of 1
to 2 mm is disposed directly above the roller. Then, by interrupting the supply of high frequency
power, the levitation force is extinguished, and the molten Ti-based alloy is dropped onto the
quartz glass, passes through the slit, and is further dropped at a circumferential velocity of 30 to
50 m / Drop on the rotating roller in sec. The molten Ti-based alloy in contact with the rotating
roller is stretched and thinned, and at the same time, is rapidly cooled and solidified. The above
process was performed in an argon gas atmosphere to prevent oxidation of the Ti-based alloy in
the molten state. Or you may carry out in a vacuum. Then, the thin plate (10 to 30 μm in
thickness) obtained by the above-described process is cut out in a fan shape, and the end edges
thereof are adhered to complete a cone-shaped diaphragm. (II) Ti: 77, 7 at%, Si: 12.3 at% and B:
10. A diaphragm was obtained in the same manner as in the above Example (I), using 3 g to 5 g
of a Ti-based alloy consisting of Oat%. The diaphragm obtained by the above steps obtained a
halo pattern specific to the amorphous structure in X-ray diffraction using α-rays to Cu − and
confirmed that it is formed of an amorphous body of a Ti-based alloy .
[Effects of the Invention] The tensile strength of the Ti-based amorphous body of the present
invention example (I) obtained by the process shown in the above example is 212 kg / m ... Tibased amorphous body of the example (II) The tensile strength of the body was improved to a
value of 235 kg / mm, which was significantly improved as compared with 42 kg / mm of pure
Ti and 120 kg / mm of T1-Si alloy. Further, in each of the examples (1) and (II), the density was
4.4 to 4.5 g / cm, which was substantially equal to the density of metal Ti (4, 5 g / cm). Also,
since an amorphous alloy is essentially a metastable phase, it transforms into a crystalline state
and stabilizes at a certain temperature or higher, and this temperature is referred to as a
crystallization temperature. It was confirmed by differential thermal analysis that the
crystallization temperature of this invention example (1) was 575 ° C., and that it was 590 ° C.
in example (n). This crystallization temperature is to ensure that it can be used in the
environment used as a vibration plate without loss of the characteristic of the amorphous body
due to crystallization. Further, the diaphragm of the present invention does not require steps
such as forging and rolling, and in particular rolling steps, so that it is homogeneous and does
not have directionality, so good acoustic characteristics can be obtained. Also, the desired shape
can be obtained by an extremely simple process, the manufacturing cost can be greatly reduced,
and a low-cost metal diaphragm can be provided, and the number of rotations of the roller or the
peripheral speed of the roller {Circle over (4)} There is an advantage that a diaphragm having an
arbitrary thickness can be obtained by controlling the width of the slit, and controlling the
viscosity by controlling the temperature of the melt. Note that the present invention is not limited
to the above embodiment, and any known means can be adopted as the means for forming the
diaphragm shape, and it is used as a skin material of a flat diaphragm or honeycomb diaphragm
by cutting it out into a predetermined shape. it can.
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