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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of a vibrating material for audio equipment used for a speaker, a microphone, a coil
bobbin and the like. (Prior Art) Generally, a material having a small mass and a large internal loss
is required as a vibration material for an audio device, and a thin body of magnesium, titanium,
or aluminum is used as a groove for all these requirements. It is a thing. Among them, it is said
that it is the best A from the viewpoint that the magnesium thin body is lightweight. However,
since magnesium has poor corrosion resistance, it has the disadvantage that the sound quality is
completely degraded due to pitting and the like and it can not withstand long-term use.
Furthermore, since the conventional magnesium thin body is made into a thin body like foil by
secondary processing such as rolling, it is subjected to distortion and the like due to the
processing, and the attenuation ability which is an important characteristic as an acoustic device
is reduced. (Problems to be Solved by the Invention) As a result of intensive research conducted
in view of the present situation, the present invention is for use in acoustic devices made of
magnesium or magnesium alloy thin film (hereinafter referred to as magnesium) excellent in
corrosion resistance and mechanical performance. It is a development of a vibrating material.
That is, as a factor that has an important influence on the corrosion resistance of magnesium, it is
because magnesium, iron, nickel, copper, etc. are contained as small amounts as impurities in
magnesium. It can be reduced to Furthermore, it is considered that the cause of the large
influence on the corrosion resistance is due to the incongruent distribution of the components in
the material and the uneven distribution of the crystal structure. Such non-uniform distribution
causes a potential difference locally, which constitutes a local cell to promote corrosion
resistance. (Means for solving the problem) The present invention is a vibrating material for
acoustic equipment characterized in that the molten material of magnesium is formed entirely of
a vibrating material to be used for the acoustic equipment by a magnesium thin body obtained by
the melt quenching method. is there. (Operation) In the present invention, since magnesium is
heated to form a molten metal, it is rapidly cooled to form a thin body such as a foil, and the
composition becomes uniform, and in particular, the crystal structure becomes finer. In the
present invention, since the magnesium is not secondarily processed as a cast product, the
damping ability does not decrease. (Example) (1) An alloy of 3 wt% At,-0, 7 wt% Zn,-0, 3 wt% MnMg is heated in a rut to form a molten metal, which is extruded on a water cooling roll and
quenched Thus, a magnesium alloy foil (the product of the present invention) having a thickness
of about 100μ was obtained.
For comparison, the above alloy was rolled to obtain a magnesium foil (conventional product)
having a thickness of about 100μ. The thin films thus obtained (the product of the present
invention and the conventional product) were each applied to a vibration material of a speaker to
test its performance. That is, the product of the present invention and the conventional product
were immersed in 3 wt% brine at normal temperature, and the weight loss was measured. The
results are as shown in Table 1. As clearly shown in Table 1 above, it was confirmed that the
vibration material of the present invention was remarkably excellent in corrosion resistance as
compared with the conventional vibration material, and could be used for a long time. Further,
the preventive ability of the present invention and the conventional product were measured by
the following equation. The results are as shown in FIG. 1. T: Time (seconds) f: Frequency A:
Attenuation initial amplitude At: Amplitude after second (effect) According to the present
invention, the corrosion resistance is excellent It can be used for a long time and is excellent in
attenuation ability, so it has remarkable effects such as long-term recovery and no deterioration
in sound quality.
Brief description of the drawings
The drawing is a relationship curve diagram between bending stress, vs. V, and damping factor
for the magnesium foil in the present invention and the conventional magnesium foil.
Bending pressure · force (kg / mm) procedure amendment 1 vin q-0, 11, 1-. Patent Office
Secretary Uka Michibe 1 Case Display Application Japanese Patent Application No. 60-143289 2,
Title of the Invention Vibrator for Audio Equipment 3, Relationship with Person Making a
Correction Patent Applicant (529) Furukawa Electric Co., Ltd. Company 4, Agent (Me I- / II) 5,
Spontaneous Correction 7, Contents of Correction (1) In the third page of the specification,
"Corrosion resistance" is corrected as "corrosion".
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