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JPS5733892

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5733892
The acoustic component is formed by dispersing and mixing silicon carbide fibers in aluminum
or aluminum alloy.
Claims
DETAILED DESCRIPTION OF THE INVENTION A first condition of physical properties required
for acoustic components such as a general two-tone arm, a diaphragm of a speaker, a head shell,
a cantilever and the like is that the Young's modulus is high. For example, in the case of the tone
arm, if the Young's modulus is low (soft), the tone arm itself will swell due to the warp of the
recording board at the time of tracing, and distortion will be generated in the hygroscopic signal.
By the way, acoustic components such as a tone arm formed of aluminum or an aluminum alloy,
a diaphragm of a speaker, a bed shell, a cantilever, and the like are conventionally used. Here, the
aluminum or aluminum alloy that forms these acoustic components may contain a large amount
of hydrogen H2 in the liquid phase but not in the solid phase. Therefore, in the solid phase
aluminum or aluminum alloy, hydrogen contained in the liquid phase was often discharged to
form pores. Then, if an acoustic component as described above is formed of aluminum or an
aluminum alloy having the pores, adjustment such as resonance occurs. Therefore, in order to
prevent these acoustic components from having pores conventionally, it is sufficient to prevent
hydrogen H2 from being contained in aluminum or aluminum alloy in the liquid phase, so that
the purity of aluminum or aluminum alloy can be increased, It is manufactured without being in
contact with air. Therefore, it requires time, equipment, and labor, which leads to poor
productivity and high cost. In view of the above, the present invention provides a good acoustic
component having a high Young's modulus and no pores. An example of an acoustic component
according to the present invention will be described below with reference to the drawings with
EndPage: 1 along with an example of its manufacturing method. In this example, aluminum or an
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aluminum alloy (for example, duralumin) (2) is placed in a furnace (1) as shown in FIG. 1 person,
and is heated and melted by a heating means (3). Then, silicon carbide fibers (4) having a
predetermined size are placed therein, and dispersed or mixed in aluminum or aluminum alloy
(2). (5) is a stirring means for well dispersing and mixing silicon carbide fibers (4) in aluminum or
aluminum alloy (2). Here, since the specific gravity of silicon carbide is 2.8 and is very close to
that of aluminum or aluminum alloy (2) (approximately 2.7), aluminum can be used in a
conventional furnace (1) as shown in FIG. Alternatively, the aluminum alloy (2), the armed silicon
fiber (4) and-can be well dispersed and mixed. And, at this time, hydrogen H2 dissolved in
aluminum or aluminum alloy (2) is silicon carbide in the furnace (1) as shown in FIG. From the
aluminum or aluminum alloy (2) in which the elementary fibers (4) are dispersed and mixed, a
billet (6) one stage before processing such as rolling or extrusion is produced.
At this point, silicon carbide fibers (4) dispersed and mixed in aluminum or aluminum alloy (2)
are still arranged in random directions. The billet (6) is then used to form an extruder (with force,
the pipe (8) as shown in FIG. 1C. In this case, silicon carbide fibers (4) dispersed and mixed in
aluminum or aluminum alloy (2) at the time of extrusion were oriented in the extrusion direction.
This is because a large pressure is applied to the silicon carbide fiber 4 # f4) in the direction
perpendicular to the extrusion direction, and at this time, the silicon carbide fiber (4) is in the
most stable state (the pressure applied to each portion is minimized. It is considered that the
direction is changed to the extrusion direction which is the Then, the pipe (8) is molded to obtain
a tone arm (9) as shown in FIG. Here, in FIG. 2, (IG is a balance weight, aυ is a bearing
mechanism, α is an arm lifter, 0 is a head shell, I is a turntable. In addition, since hydrogen H2
dissolved in aluminum or aluminum alloy (2) was discharged at the time shown in FIG. 1 person,
no pores by hydrogen gas are generated in the tone arm (9) shown in FIG. Not. Incidentally,
silicon carbide fiber with a Young's modulus of 20000 駿 /-to aluminum with a Young's modulus
of 7000 Kf / w 2. In the tone arms formed by dispersion and mixing of 1096 and 2096,
respectively, those having high Young's modulus of about 110,000 / − and 13 ooo Ky / − can
be expected. As described above, according to the tone arm (9) according to the present
invention, since silicon carbide fiber (4) is dispersed and mixed in aluminum or aluminum alloy
(2), the thickness is It can be made relatively thin. In addition, silicon carbide fibers # (41 are
oriented in one direction and are three-dimensionally arranged) dispersed and mixed in
aluminum or aluminum alloy (2), the dispersion of silicon carbide fibers (4), The mixing does not
weaken the strength. In addition, since the Young's modulus of silicon carbide fiber (4) dispersed
and mixed in aluminum or aluminum alloy (2) is small (about 20000 im / l112), aluminum or
aluminum alloy (2) itself by that amount A tone arm (9) is obtained which has a higher Young's
modulus than the formed tone arm. Furthermore, since hydrogen H2 dissolved in aluminum or
aluminum alloy (2) is exhausted during the manufacturing process, a tone arm (9) having no
pores due to hydrogen gas is obtained.
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Therefore, the tone arm (9) according to the present invention is light in weight, and is free from
any waviness due to the warp of the recording disc, etc., and further, it does not cause the
alignment etc. of the resonance etc. In addition, since the silicon carbide fiber (4) is dispersed and
mixed in aluminum or aluminum alloy (2) according to one tone arm (91 according to the
present invention), as described above, the manufacturing process thereof Since hydrogen H2
dissolved in aluminum or aluminum alloy (2) is automatically exhausted, no pores are generated.
Therefore, in order not to generate pores, it is not particularly necessary to manufacture without
contacting with air. As a result, the time, equipment and labor required for this can be saved, and
the productivity is good. EndPage: 2 It is also necessary to orient silicon carbide fibers (4)
contained in aluminum or aluminum alloy + 21 K automatically in the process of extrusion as
described above, so there is no need to carry out special orientation processing, It does not
require extra work. In the above embodiment, although the present invention is applied to the
tone arm (9), the present invention can be applied to other acoustic parts such as a moving plate
of a slider, a head shell, a cantilever, etc. is there. The present invention is not limited to the
above-described embodiment, and it goes without saying that the configuration of the ground
mass can be taken without departing from the scope of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a manufacturing process
of an embodiment of an acoustic component according to the present invention, and FIG. 2 is a
view showing an embodiment of an acoustic component according to the present invention. (2) is
aluminum or an aluminum alloy, (4) is a silicon carbide fiber, and (9) is a tone arm according to
the present invention. Figure 2 EndPage: 3
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