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Specification 1. Name of invention
Speaker acoustic lens
The present invention relates to an acoustic lens for a speaker. An aluminum alloy, zinc or the
like has been used as the I'A of the acoustic lens. These feathers often cause vibration or
resonance because they have a small internal loss and are installed at a place with high sound
pressure, which adversely affects the sound quality. EndPage: 1 Therefore, it is conceivable to
coat the surface with damping material to prevent this vibration and all resonance, but acoustic
lens is difficult to coat damping material from its structure, and even if it can be coated, damping
material is In general, the soft material absorbs the sound wave and there is no favorable result
because many soft materials are used. The present invention has been made in view of oblique
points, and an object of the present invention is to provide a speaker acoustic lens that is
lightweight, robust, has a large internal loss, and does not cause resonance or vibration. Next, an
embodiment of the present invention will be described with reference to the drawings. Reference
numeral 1 denotes a speaker body, 2 denotes an acoustic lens, and has a known shape. In the
present invention, the material of the optical lens 2 is metal magnesium (hereinafter referred to
simply as magnesium) or an alloy containing metal magnesium as a component (hereinafter
referred to simply as magnesium alloy, for example, magnesium 90 to 95, aluminum, zinc,
manganese, It is formed of silicon, copper, iron, an alloy with another metal, or an alloy in which
at least 99.90% of magnesium and a very small amount of beryllium and / or manganese are
added. Magnesium is the largest metal of internal loss, and is about 200 times larger than the
internal loss of aluminum. By the way, although magnesium is generally used in the form of an
alloy with aluminum and zinc, aluminum and zinc significantly impair the internal loss of
magnesium. For example, the addition vC of 0.1 wt% aluminum reduces the internal loss of
internal loss magnesium to about 475, and at 0.2 wt% it becomes about 1710 at about 1 / 2.1
wt%. In addition, the male blade 1i1. In this case, the decrease in internal loss is even larger, and
the addition of 0.1 wt% reduces the internal loss to about 1710 with the addition of about 1 /
2.0.2 wt%. Furthermore, other metal elements also impair the internal loss of magee-sium, and
when the content exceeds 0.1 wt%, the internal loss becomes remarkably small. Therefore, in
order to take advantage of the feature that the internal loss of magnesium is large, the purity
must be 99.901 or more.
By the way, high purity magnesium has a risk of causing a fire when it is manufactured by die
casting or casting. Therefore, according to the present invention, the danger of ignition is
prevented by adding beryllium tO in the range of 0.05 to 0.05 wt%. Beryllium hardly dissolves in
magnesium and hardly loses the internal loss of magnesium if the addition is less than o wt%.
Moreover, when high purity magnesium is used, it is corrosion resistance that becomes a
problem with ignitability. That is, when 0.0015 wt% or more of iron is contained in magnesium,
the corrosion resistance remarkably deteriorates. When this is commercialized, the appearance
as an acoustic lens is impaired, and it is necessary to enhance corrosion resistance. Therefore, the
present invention reduces the λ corrosion resistance by adding manganese in the range of 0.15
to 03 EndPage: 2 wt%. And if it is addition within the above-mentioned range, internal loss of
magnesium will not be greatly affected. The present invention, as described above, is an acoustic
lens for speakers made of magnesium, so it is a material that is lightweight and robust and has a
large internal loss, so it is less likely to cause vibration or resonance and can diffuse sound waves
well. It is. Also, magnesium of high purity (purity of 9990% or more) is high as the specific elastic
modulus and internal loss are almost the same as those of high purity magnesium even if other
metals' fI: added (depending on the addition evidence) Purity magnesium is the best material for
acoustic lenses. And, in the present invention, beryllium is added by o, oos. d By adding 0.15 to
0.3 wt% of a gun or both, light weight, high internal loss, non-ignitability, and / or thick corrosion
resistance, or both A speaker acoustic lens having characteristics can be obtained.
4 is a perspective view of the speaker river sound according to the present invention is an
embodiment of the lens attached to the speaker according to the present invention. 1 ...... speaker
2 ...... acoustic lens patent applicant Pioneer Corporation ρ, attorney Takino Hideo cormorant h.
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