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JPS58131894

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DESCRIPTION JPS58131894
[0001]
The present invention relates to a speaker capable of improving sound quality, and more
particularly to improvement of a diaphragm. In general, fibrous cones or diaphragms such as
paper or mother lup are used as the material of the speaker diaphragm, but they are susceptible
to moisture absorption, so the sound quality is likely to change due to the influence of humidity,
and bending stiffness and internal loss are small. Therefore, there is a disadvantage that
distortion is likely to occur in large amplitude or in middle and high tone range and formability is
poor. Therefore, in order to solve the above-mentioned drawbacks, composite plates using, for
example, a single metal plate or a double cam sandwich are also provided. However, these have a
small vibration loss coefficient, that is, an internal loss and are inferior in damping
characteristics. In some cases, split vibration or the like may occur, and it is difficult to say
perfect when suppressing the occurrence of strain. The present invention has been made based
on the above-mentioned circumstances, and the object of the present invention is to exhibit
stable performance without being affected by humidity, good processability, large internal loss,
and damping characteristics as a diaphragm. An object of the present invention is to provide a
speaker that can obtain excellent sound quality. That is, the present invention is a speaker using
a superelastic alloy as a material of the diaphragm. An embodiment of the present invention will
be described below with reference to the drawings. In the figure, 1 denotes a frame, 2 denotes a
yoke, 3 denotes a permanent magnet, and a cone-shaped diaphragm 6 is supported on the frame
1 via a support member, that is, an edge 4 and a spider 5. ????????????? Also, in
the central part of the diaphragm 6? A chair coil 8 is provided, and a pole piece 9 is inserted into
the voice coil 8. The above configuration is similar to that of the conventional cone-shaped
speaker. In the present invention, a superelastic alloy is used as a material of the diaphragm 6.
The superelastic alloy is, for example, an alloy represented by Ti-Ni, Ti-N1-X (X: Cu * Fe + Cr,
etc.), Cu-Zn-AA ', etc., and these are all thermoelastic martensitic transformations. It is also called
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a shape memory alloy because it has a shape memory effect caused by By subjecting these alloys
to heat treatment with a predetermined composition, the reverse transformation end temperature
(Af point) can be reduced to room temperature or lower, and as a result, they have properties
called superelasticity or pseudoelasticity at room temperature. Super-elasticity is the property
that external stress is applied to distort it beyond the yield point, and even if apparent plastic
deformation is performed, it returns to its original shape before deformation if external stress is
removed, so to speak It exhibits rubber-like deformation behavior. That is, since it has a large
elastic strain area and also has a large elastic hysteresis due to the internal friction of the
material itself, the damping characteristics against vibration are excellent.
As an example, FIG. 2 shows a tensile stress-dimple curve of a Ti- (51 at%) Ni alloy that has been
water-quenched after vacuum heating at 900 ░ C. In this alloy, the strain returns completely to
the original shape in the elastic region up to 7.5%, and the elastic hysteresis increases as the
strain increases. Also, when the strain exceeds about 2%, the strain increases with a substantially
constant stress. The damping characteristics are shown in FIG. 3 as a representative of the case
of superelastic Ti-Ni alloy and in FIG. 4 as steel as a general metal material. It can be seen that
the damping characteristics of the superelastic Ti-Ni alloy are very excellent, with ? = 0.04449
for Ni alloy and ? = 0.00509 for steel. Therefore, if a superelastic alloy is used as the diaphragm
6, the occurrence of divided vibration at the resonance point of the diaphragm can be
significantly reduced, and in particular, the frequency characteristics at large amplitude or in the
middle / high range are significantly improved. it can. Table 1 below compares the vibration loss
coefficients ? of various materials. Here, the vibration loss coefficient ? is a coefficient
representing the amount by which mechanical work is lost by internal friction due to viscosity
and converted to thermal energy, and is also called simply loss coefficient or internal loss. That
is, a material with a large loss coefficient ? ? damps vibrations quickly, and if it is used as a
speaker diaphragm, divided vibrations due to resonance are suppressed, and the sound pressurefrequency characteristics at large amplitudes or at mid to high frequencies are flat. Sound quality
distortion is greatly reduced. 5-6 As apparent from Table 1, the diaphragm using the superelastic
alloy has a specific elastic modulus E // 'equal to that of the conventional paper and guruso use,
and the loss coefficient ? Is superior to paper, lup and any other material, and it is apparent that
the material of the diaphragm is very suitable. The support member such as the edge 4 or the
shield 5 may be formed integrally with the diaphragm 6 with a superelastic metal. In this case,
the structure is simplified and the manufacture becomes easy, as well as the diaphragm and the
support member are made of the same material, so that it is possible to prevent the stiffness and
the mass from becoming discontinuous at the boundary between them. The sound quality can be
further improved. It goes without saying that the present invention is applicable not only to the
diaphragm of a cone-shaped speaker but also to the diaphragm of a dome-shaped speaker or a
horn-shaped speaker. As described above, the present invention uses a superelastic alloy as the
diaphragm, so that superelasticization and high loss can be realized, and ideal damping
characteristics can be provided as the diaphragm, and the sound quality is improved.
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Moreover, since it is a metal diaphragm, it does not absorb moisture and can exhibit stable
performance without being adversely affected by humidity, but of course it can be easily
processed into a cone or guaia frum shape, which has stable quality and predetermined
characteristics. It is easy to get In addition to using a superelastic alloy as a single substance, it
may be used by covering it with other materials by means of vapor deposition, thermal spraying,
plating or the like, or it may be used as a composite material such as lamination or sandwich.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a speaker showing one embodiment of the present invention,
FIG. 2 is a tensile stress-strain curve of a superelastic Ti-Ni alloy, and FIG. 3 is a damping
characteristic of the superelastic Ti-Ni alloy. FIG. 4 is a damping characteristic diagram of the
steel material.
4 иии Edge (supporting member), 5 иииииииииииииииииииииииииииииииииии Vibration plate. Applicant agent Patent
attorney Suzue Takehiko Figure 1 Figure 3 Figure 4
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