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JPS5372536

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DESCRIPTION JPS5372536
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the present invention, and FIG. 1 is a half
plan view of the present invention applied to a dome-shaped diaphragm, and FIG. Fig. 3 is a
partially cutaway plan view when the present invention is applied to the cantilever, Fig. 4 is an
enlarged view within the circle P of the previous figure, and Fig. 5 is a vibration body of the
present invention and a conventional vibration body. Fig. 6 shows the frequency characteristics
and distortion rate characteristics, and Fig. 6 shows the case where the vibrator of the present
invention is applied to the cantilever of the big amplifier cartridge and the frequency
characteristics, crosstalk characteristics, and mechanical impedance of the conventional
cantilever tonoso. Each characteristic is shown. Vibrator of 0 ииииии Cu-Al-Ni alloy, the vibration
portion 10 ...... dome type speaker, 10a ...... dome ff, TOB ...... Kono 1 Geshiyon iB, 10c ...... edge
portion, Sutaraisu mounted on the end s of the cantilever 11 ...... pickup cartridge.
DETAILED DESCRIPTION OF THE INVENTION The present invention is a vibration for an electric
sound wave converter mainly made of metal or metal, represented by a speaker such as a spy
door, a diaphragm such as a microphone or a canna of a pickup cartridge, and a lever It relates to
the body. Conventionally, aluminum, titanium, etc. are often used as materials used for metal or
metal-based vibrator as described above from the viewpoint of light weight and easy forming
process, but the vibrator is a speaker, microphone or the like When the diaphragm is
constructed, due to the nature of the material, a specific vibration mode is generated throughout
the diaphragm, causing a large peak in the high frequency characteristic and significantly
impairing the sound quality, and also large in terms of rigidity. It was difficult to get one for
input. In addition, in the case where the vibrator constitutes a cantilever, in consideration of
lightness and rigidity, the j-shape is inevitably prioritized to some extent, and the cantilever
occupies the majority of the vibration system, t6 ' There was a bad effect on the high
performance of the ridge. Therefore, the properties desired as this type of vibrator from a
comprehensive viewpoint are required to have the density ? as small as possible, the Young's
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modulus ? as large as possible, and the internal loss R to be appropriately large. However, these
three properties have mutually contradictory surfaces, and a vibrating body that is actually used
has been used that satisfies these considerations or two. The present plan was devised in view of
the above-mentioned difficulties and drawbacks, and the purpose of the plan is to have a peak
that occurs in high frequencies such as frequency characteristics by having an appropriate
internal loss R to obtain desired characteristics. It aims to provide a vibrator for an
electroacoustic transducer which can be removed for improvement, high mechanical strength,
low material cost and good machinability, and hence high mass productivity and hence
inexpensive supply to the market. . Hereinafter, the details of the present invention, its specific
configuration and means will be described according to the drawings and tables. 0 is a vibrator
for an electroacoustic transducer, which is a copper-aluminum-nickel alloy (hereinafter referred
to as a Cu-t-N engineering alloy). An example of the composition is an alloy of Cu-10 to 2 ░ M12 to 2 ONi (weight percent). The O-m t-Mi alloy having the composition in such a range, and
conventionally used as a vibrator for an electroacoustic transducer represented by a speaker, a
microphone, and a cantilever of a pickup cartridge. Young's modulus of the vibrating body X ~
unit ? / M1. The density ? and the ratio IC / ? of Young's modulus and vi degree are shown in
Table 1 respectively, as shown in Table 1. In this case, the vibration body 0 formed of the Ou-m tNi alloy of the present invention is Young Although the factor E shows a value smaller than that
formed by a single substance of two other metals, ie, aluminum and titanium, the Young's
modulus ? and the internal loss R have mutually contradictory properties. It can be seen that the
invented oscillator O has a larger internal loss R than the oscillators of aluminum and titanium.
? toughness,-'father, internal loss R, and damping coefficient in the high frequency
characteristics of the oscillator are known to show a proportional relationship, and that the
damping coefficient of aluminum and titanium is about 1 inch, a2- On the other hand, the
damping coefficient of the Ou-m t-Ni alloy is 50 inches. FIG. 5 shows the frequency
characteristics and strain rate characteristics of aluminum and titanium, and the Cu--M
constituting the vibration body 0 of the present invention as it represents the frequency
characteristics and strain rate characteristics of the -N engineering alloy, respectively. In FIG. 5,
the curve of 1.3 is the frequency characteristic of the vibrating body 0 of the present invention
and the distortion factor, respectively, and the frequency characteristic of the aluminum or
titanium vibrating body conventionally used for the curve Sa of 2.4. And strain rate
characteristics are shown. As can be seen from FIG. 5, the high resonance frequency,! . The -21 number f-is lower in the diaphragm OO of the present invention, but its characteristic is that a
smooth curve with peaks removed is obtained, and the usable frequency range is expanded. In
addition, it is possible to improve the deterioration of high strain rate. Next, a practical example
in which the present invention is applied to the vibrator for an electroacoustic transducer
according to the present invention as a diaphragm of a speaker representing the vibrator and a
cantilever of a pickup cartridge will be described. First, FIG. 1 and FIG. 2 show a first embodiment
in which the present invention is applied to a dome-shaped speaker diaphragm, which are a half
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plan view and a sectional view of the dome-shaped diaphragm, respectively. In each of these
figures, 10 is integrally formed with the dome portion 10b1 of the dome-shaped vibrating
portion and the flange portion 10b1 of the vibrating portion. Thus, as described above, the
vibrator 0 is integrally formed of a Cu-t-Ni alloy in which the internal loss R should be large.
Next, FIGS. 3 and 4 show a second specific embodiment in which the present invention is applied
to a cantilever of a pickup cartridge, and a plan view including a partial cross section and an
enlarged view of the previous circle P. In this case, a cantilever mounted on the front end of the
cantilever at 11 is shown, and the other same parts are denoted by the same reference numerals
in each embodiment. The cantilever thus constructed has a large internal loss R as in the above
embodiment, and its frequency characteristics, crosstalk characteristics, mechanical impedance
characteristics, each made of aluminum or titanium conventionally used. If it compares with a
characteristic ratio and expresses it to -S graph, FIG. 6 will be obtained. In FIG. 6, the curves
indicated by 5 and 7.9 indicate the frequency characteristics, the crosstalk characteristics and
the mechanical impedance characteristics, respectively, in the case where the unworked solution
Ou-m t-yi alloy is applied to the pickup cartridge. The curve shown by .10 shows the abovementioned characteristics in a pickup cartridge made of aluminum or titanium as conventionally
used.
As is apparent from FIG. 8, the vibrator 0 applied to the cantilever of the pickup cartridge
composed of the unplanned solution Cm-m t-Ni alloy has a lower high-resonance frequency fthan that of the conventional vibrator such as aluminum. However, it becomes an ideal
characteristic by removing the peak, and can improve the same wave number characteristic in
the high region. As described above, the vibrator for the electric sound conversion system
according to the present invention can eliminate the peak occurring in the high frequency region
etc. and improve it by having an appropriate internal loss to obtain the desired characteristics. In
addition, since it is formed of an on-type t-Ni alloy, the mechanical strength is high and the
structure is robust, and the material cost is lower than the case where aluminum etc. is used as a
single body and is excellent in workability. There is an effect such as being suitable and further
finished relatively light.
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