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JPS53131824

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DESCRIPTION JPS53131824
Description 1, title of the invention
Vibrator plate for acoustic converter
The present invention relates to a diaphragm for an acoustic transducer such as a speaker or
microphone, and more particularly to a dome-shaped diaphragm in a high sound speaker. As the
conditions required for the diaphragm, it is a low density material with few restrictions due to
processing even if the thickness is reduced to reduce the mass, and the Q of the resonance point
is lowered to reduce the influence on the sound quality. It is a material with a large internal loss.
By the way, materials used for conventional diaphragms are aluminum and titanium, which have
a large mass and EndPage: 1 internal loss is small. Therefore, sufficient reproduction sensitivity
can not be obtained and vibration modes specific to the diaphragm are not available. In the
present invention, which was made in view of oblique points, the object of the invention was to
reduce the mass and to reduce the internal loss. To provide a large acoustic transducer
diaphragm. Next, an embodiment of the present invention will be translated together with the
drawings. (1) It is formed of a magnesium material to which metallic magnesium (hereinafter
simply referred to as magnesium) having a purity of 99.90% or more or a very small amount of
beryllium and / or manganese is added. It is a dome-shaped diaphragm. By the way, magnesium
has a density of 114φ / crn3 and is about 1 / 1.5 smaller than the density of 2.64P / crn 'of
aluminum and about 1 / 2.5 smaller than the density of 4.5P / cm "K of titanium. . Furthermore,
the internal loss of magnesium is about 200 times larger than that of aluminum and about 300
times larger than that of titanium. Generally, magnesium is used in the form of an alloy with
aluminum or zinc, but aluminum and zinc significantly impair the internal loss of magnesium. For
example, the addition of 0.1 wt% of aluminum reduces the internal loss of magnesium to about
415, and when adding 2 wt% c, t zinc which is about 1/10 at about 172.1 wt% at 2 wt% The
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reduction in internal loss is even larger, and the internal loss decreases to about 1/10 at about 1
/ 2.0.2 Wt% with the addition of 0.1 wt%. Furthermore, other metal elements also impair the
internal loss of magnesium, and when the content of the element exceeds o, twt%, the internal
loss becomes remarkably small. Therefore, the purity must be at least 99.degree. 90% in order to
take advantage of the high percentage of internal loss of magnesium. By the way, when high
purity magnesium is processed into a thin plate, there is a risk of ignition in the thin plate, that is,
the diaphragm or the processing step.
In particular, this hazard is a major problem when used as a product. Therefore, the present
invention prevents the danger of ignition by adding beryllium in the range of o, oos to 0, 05 wt%.
Beryllium hardly dissolves in magnesium and hardly loses the internal loss of magnesium if it is
added at 0.05 wt% or less. Moreover, when high purity magnesium is used, it is corrosion
resistance that becomes a problem with ignitability. That is, when the iron is contained in
vognesium o, wt. Since this significantly reduces the mechanical strength of the diaphragm, it is
necessary to set corrosion resistance. Therefore, the corrosion resistance is enhanced by adding
mankan in the range of 0.15 to 0.3 wt% in the present invention. And if it is addition in the said
range, it does not have big influence on the internal loss of magnesium. FIG. 2 shows the
frequency characteristics that can be used for the diaphragm formed of pure & 99.90%
magnesium. EndPage: As can be determined from FIG. 2 as well, it can be seen that the resonance
sharpness Q falls and becomes flat. This broadens the range of frequency characteristics. As
described above, according to the present invention, since the diaphragm is made of magnesium
having a purity of 99.90% or more, it is possible to obtain a vibrator which is lightweight and has
a large internal loss. Also, high purity magnesium has almost no change in specific modulus and
internal loss compared to high purity magnesium even if other gold is added (depending on the
amount added), so the material of high purity magnesium plate is used As the best. And in the
present invention, beryllium is added with o, oos to 0.05 wt%, or manganese is added in an
amount of 0.15 to 0.3 wt! ! By adding A, or both, it is possible to obtain a diaphragm which is
light in weight, large in internal loss, non-ignitable, high in hot corrosion resistance, and / or
both. It is a thing.
4. Brief description of the drawings shows one embodiment of the diaphragm for acoustic
converter according to the present invention, FIG. 1 is a broken Tl 1 i figure, FIG. 2 is a
conventional diaphragm and the frequency characteristics of the diaphragm according to the
present invention FIG. 1 ··············································································· 7 3
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