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JPS57152793

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DESCRIPTION JPS57152793
Description 1, title of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention relates to the improvement of the
diaphragm for the speaker As the material of the conventional diaphragm for the speaker,
natural or synthetic fiber, polymer foam or film, metal foil or the like is used. In terms of the
properties required, in general, the material for the speaker diaphragms has advantages and
disadvantages, such as low density (light weight) and high Young's modulus (high mechanical
strength). In order to obtain shape rigidity in the case of forming as a diaphragm, it can be
formed into a desired shape, and furthermore, the forming method is required to be easy and
suitable for mass production. Regarding metal materials used as plates, there are beryllium
(hereinafter referred to as Be), titanium (hereinafter referred to as Ti), aluminum (AI) and the like
as a metal material of this type. Be has a density j) -1, 82 P / cd, Young's modulus E-869 x 10
"dyn / cd, and the properties of the material itself almost satisfy the requirements as a diaphragm
material. However, Be has very poor machinability and has various problems in forming it into a
diaphragm. That is, since Be is a very difficult metal, it is difficult to form it in a foil shape and
further to form it into a desired complicated diaphragm shape by pressing. Therefore, in order to
form such an e in the shape of a diaphragm, at present, surface treatment techniques such as
vacuum evaporation, ion plating, gas phase adult cow, etc. are applied, but the price of this device
itself is extremely high. In addition to the extremely long formation time and the resulting
increase in the cost of the product, it has the disadvantage of EndPage: 1, which can not be
provided in large quantities. On the other hand, when considering AQ and Ti, it can be formed
into a diaphragm shape by both press work simultaneously, but T1 has a high density (f =
4.54117 G shoots, A store has a density (, ? In the case of -2.699 or 1t, 4), it had a physical
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disadvantage that the Young's modulus (E-0, 708 × 10 ° ′ ′ ′ dyn / c4) was low. And, in
recent years, focusing on magnesium alloys, especially magnesium lithium alloys, in terms of the
fact that their density is much smaller than that of other metals and that their internal crystal
structure is larger than their unique crystal structures, they are used as speaker diaphragms. For
example, the density (y / cdi) of magnesium containing 5 wt%, 15 wt% and 20 wt% of lithium and
lithium alloy has been attempted to be applied, and the Young's modulus is 1.56.1.30.1.19
respectively. (X10 ′ ′ ′ ′ ′ n / cdi) is 0.474.0.542.0.576, respectively.
Therefore, the specific elastic modulus (#) has a value of 0.55 to 0.degree. 70, which is a good
property as compared with aluminum (J "child-0.51", titanium (J "positive positive-0, 48) Can
have. In addition, when magnesium or lithium alloy is used to form a diaphragm of equal weight
to other metals, the thickness of the diaphragm can be increased because the density is small,
and a standard for the stiffness of the diaphragm For example, it is possible to make the crosssectional second moment value about 10 times as large as that of aluminum, and it becomes
possible to measure the expansion of the high frequency reproduction frequency. As described
above, although the magnesium-lithium alloy has the property of being excellent as a diaphragm
material, there are various problems in practical use. That is, since magnesium is easily oxidized
by moisture in the air and lithium is a very active metal at normal temperature, magnesium
lithium alloy is easily oxidized by the environment used as a speaker diaphragm, and there is a
problem in durability Therefore, in order to use the magnesium lithium alloy for the diaphragm,
the surface of the diaphragm shape has been subjected to a chemical conversion treatment such
as chromic acid treatment or the like, for example. It was difficult to have Accordingly, the
present invention is intended to solve the above-mentioned problems and to further enhance the
processability and rigidity, and is a diaphragm formed of an alloy of magnesium, lithium and zinc,
which will be described in detail below. EXAMPLE A magnesium alloy ingot containing 12 wt%
lithium and 2 ° Q wt% was rolled to obtain a foil of 20 μm thickness. This is formed into a
dome-shaped diaphragm by press molding, and then treated with chromic acid to form a
chromium film on the surface of the diaphragm. And in order to investigate durability of the said
diaphragm, when it left in the star circulation of 42 degreeC and the relative humidity 96%, and
observed generation | occurrence | production of rust, the following results-were obtained. As
described above, although the zinc-free magnesium-lithium alloy diaphragm ■ can not withstand
practical use even if it is treated with chromic acid, the diaphragm ■ of the present invention
can be practically used by applying the chromic acid treatment It was possible to obtain a certain
degree of durability. Moreover, although the content of zinc can be up to several 10%, the
content of about 1% can provide a desired antirust effect, and the addition of zinc can minimize
the reduction of elongation and add no age hardening. About 1.5% to 2.5% is suitable for the
purpose of the present invention in that the amount is about 2%. In addition to the chemical
conversion treatment described in the examples, the surface treatment can be performed by
various means such as anodization, synthetic resin film coating, and formation of a metal
deposition layer as desired.
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Furthermore, the diaphragm may have a dome shape or a cone shape, and the diaphragm formed
in the dome shape can be used not only as a dome type speaker but also as a center radiator cap
and dust cap disposed at the center of the cone type speaker It is a thing. EndPage: As described
in 2 or more, the present invention is a diaphragm for a speaker formed by forming an alloy of
magnesium, lithium and 1.5 to 2.5 wt% of zinc. It has a remarkable anticorrosion effect while
maintaining the long point as it is, and has an advantage of being able to obtain durability for
practical use. EndPage: 3
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