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JPS6382199

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DESCRIPTION JPS6382199
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm made of a metallic material having a sufficient internal loss and a method of
manufacturing the same. (Conventional art and its problems) Metal materials are widely used as
diaphragm materials for high-pitched speakers because they have high elastic modulus and can
increase the reproduction limit frequency in the high region. However, since the internal loss is
extremely small, the peaks and valleys on the frequency characteristics are large and the
transient characteristics are also bad, so there were various problems in using for speakers for
bass and full band. Also in the case where the surface of the metal material is coated with
ceramics, there is an effect to increase the elastic modulus, but there is a problem that almost no
effect can be seen in the application of internal loss. (Means for Solving the Problems) The
present invention has been proposed in view of the above points, and the object of the present
invention is to have a sufficient internal loss even if the surface of a metal material is coated with
a ceramic. It is an object of the present invention to provide a speaker diaphragm having a
surface ceramic coat laminated structure and a method of manufacturing the same. That is, in the
present invention, in order to achieve the above object, a resin layer having a large internal loss
is provided in the middle. In this case, in the method of providing the ceramic layer on the metal
surface by the so-called thermal spraying method, it is necessary to raise the temperature of the
diaphragm base to the high temperature in the process. It is impossible to coat directly.
Therefore, in the present invention, in view of the fact that it is preferable to use the
electrodeposition method as a result of various experiments, a ceramic coating is applied to the
metal foil surface while preventing thermal deterioration between the intermediate resins.
(Operation) In the diaphragm of the present invention, since the resin layer having a large
internal loss is provided in the middle layer, even if it is a diaphragm made of a metal material, it
can be used as a speaker for bass and all bands. There is. EXAMPLE In the method according to
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the present invention, since the metal surface is coated with ceramics by the electrodeposition
method, it can be processed at a relatively low temperature, and the intermediate resin layer is
not subjected to any thermal deterioration. In addition, the ceramic layer is simultaneously
coated on the surface of the two metal foils as the front and back of the diaphragm sandwiching
the resin layer, and the process is simple and simple, and is suitable for mass production. That is,
the diaphragm of the present invention is formed by laminating two diaphragm base materials
made of metal foil coated with ceramics via a resin layer having a large internal loss, and this
diaphragm is manufactured by the following process It is. (1) A step of laminating two metal foils
through a resin layer having a large internal loss.
(2) A step of forming the laminate into a desired diaphragm shape by press molding. (3) A step of
forming a ceramic layer on the surface of the molded article by electrodeposition. Specific
examples are as follows. Example 1 A 30 μm thick aluminum foil as a metal foil, PAN
(polyacrylonitrile) as a resin material, and a laminated sheet having a finished laminate thickness
of 80 μm are formed by press molding and then ceramic coated by an electrodeposition method.
The frequency characteristic of the speaker diaphragm having a diameter of 10 crrl obtained as a
result is shown in FIG. In the figure, A is according to the present example, and B is with the
comparative example ceramic-coated aluminum single plate diaphragm, and as apparent from
this characteristic chart, the peaks and valleys are reduced from the middle range to the high
range to improve the characteristics. I was able to. Physical properties of each material are
shown in the following table. (Effects of the Invention) As described above, according to the
present invention, since a resin layer having a large internal loss is provided in the middle of a
metal material surface coated with ceramics by a simple method suitable for mass production.
Even if it is a diaphragm made of a material, it can be used as a speaker for bass and a full band.
Moreover, according to the manufacturing method of the present invention, there is an effect
that manufacture is easy and suitable for mass production.
[0002]
Brief description of the drawings
[0003]
The figure shows the characteristics of the sound pressure level against the frequency of the
diaphragm according to the present invention and the prior art.
A · · · The present invention, B · · · · · Conventional example is one person
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