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The present invention relates to a diaphragm material of a speaker, and is intended to improve
frequency characteristics of the speaker by using a superelastic alloy which causes thermoelastic
martensitic transformation to the diaphragm that emits the sound of the speaker. Currently, cone
speakers are mainly used in the middle and low range as speakers. This is to make a conical
diaphragm vibrate by a moobin or Gukoil to emit a sound. In addition, there is a ribbon lighter for
exclusive use of the high range. This is to cause current to vibrate in metal foil, and this metal foil
itself emits sound 一般 Generally in a speaker, a diaphragm that emits sound needs to emit sound
in a certain frequency band, Moreover, it is ideal that the frequency characteristic is flat.
However, in the conventional speaker, the diaphragm causes natural vibration at a certain
frequency, and the sound becomes abnormally large at that frequency. The frequency that causes
this natural vibration is determined by the density and rigidity of the diaphragm material, and the
magnitude of the natural vibration is determined by the internal friction coefficient of the
material, but in the materials used conventionally, the natural frequency is the operating
frequency Flat frequency characteristics were not obtained because they were present in the
zone and the internal friction was not sufficient. The present invention has been made in
consideration of these points, and aims to prevent the resonance and improve the frequency
characteristics of the speaker. That is, as a diaphragm material of the speaker, a superelastic
alloy that undergoes thermoelastic martensitic transformation is used to prevent resonance. This
alloy, which undergoes thermoelastic martensitic transformation, exhibits a matrix phase above a
certain transformation temperature and produces a martensitic phase below this temperature.
The temperature at which the martensitic reverse transformation from the martensitic phase to
the matrix phase is called martensitic reverse transformation temperature, and the temperature
at which the matrix phase transforms to the martensitic phase is called martensitic
transformation temperature. The difference between the martensitic transformation temperature
and the martensitic reverse transformation temperature is from several degrees C to several tens
degrees C. The alloy that produces thermoelastic martensitic transformation incorporates the
twin boundaries of the martensitic 'phase and the boundary of the parent phase and the
martensitic phase. When this alloy is externally vibrated, the above twin boundaries and phase
boundaries move and consume vibration energy. For this reason, this alloy is useful as a
vibration-proof material □ As an example of an alloy having such characteristics, TiN3 alloy and
CuAtZn alloy are well known. Generally, in order to prevent resonance, a material having a large
internal friction may be used, but the diaphragm of the speaker needs to have a certain degree of
rigidity and light weight, and so far no suitable material has existed.
The superelastic alloy which produces thermoelastic martensitic transformation used in the
present invention is excellent in mechanical strength and anti-vibration performance as shown in
the drawings. Therefore, the peak value at the resonance frequency can be lowered by using this
alloy for the diaphragm of the speaker. In addition, since the amplitude at frequencies other than
the resonance frequency is not largely affected by the internal friction coefficient, an amplitude
comparable to that of the conventional material can be obtained. That is, when compared with
the frequency characteristic of the conventional speaker, only the peak value at resonance is
lowered, and a flatter frequency characteristic can be obtained. Furthermore, in the present
invention, as described above, not only the superelastic alloy is used as a diaphragm material for
a speaker, but also in the case of a ribbon lighter, even better ribbon frequency characteristics
can be obtained by using it as an alloy foil. As described above, according to the present
invention, resonance peaks are prevented and flat frequency characteristics can be obtained, and
the input signal can be faithfully reproduced.
Brief description of the drawings
4 JIF 4 Yoshi, a characteristic diagram showing the vibration reduction coefficient of various
materials used for speakers 0 agent patent attorney patent attorney 愛 love 51 rftq 弥 knee (kg /
mrl) procedure correction book 1.
11 display Japanese Patent Application No. 56-1098952, title of the invention 3, speaker 4 to
correct, agent self-developed 6, object of correction (1) Claim column of the specification, column
7 of correction Contents (1) Delete the second item of the claims of the specification as attached.
(2) Delete page 4, lines 13 to 16 of the specification. A speaker characterized by using a
superelastic alloy which produces thermoelastic martensitic transformation as a diaphragm
material for a speaker. Attorney Attorney Attorney Fuhiko Aihiko 5
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