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JPS56169993

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DESCRIPTION JPS56169993
Description 1, title of the invention
Method of manufacturing multilayer metal diaphragm
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a diaphragm such as a speaker. る。 Metals may be used as diaphragms of horn
type speakers, dome type speakers, etc. For example, metals such as beryllium and aluminum are
used. In order to manufacture this metal diaphragm, a method by vapor deposition is usually
employed, which makes it possible to obtain a lightweight, high-rigidity diaphragm. However, the
conventional metal diaphragm by vapor deposition often uses a single type of metal, and in the
case of such a single metal diaphragm, there has been a drawback such that the control of the
resonance frequency of the diaphragm 1 is not easy. . There are cases where deposition is carried
out in the state of an alloy using a plurality of types of metals, but due to a difference in the
specific gravity of the metal, etc., the composition of the alloy formed as a diaphragm can not
always be kept constant. There are many problems, such as the inability to maintain high quality.
The present invention ameliorates the above-mentioned drawbacks in the conventional method
of manufacturing a diaphragm by vapor deposition, and a method of manufacturing a multilayer
metal diaphragm capable of stably obtaining a metal diaphragm having desired vibration
characteristics. Intended to provide. According to the present invention, a method of producing a
multilayer metal diaphragm uses a metal in which different metals are arranged in a layer as a
metal for vapor deposition, and sequentially evaporates the metal for vapor deposition EndPage:
1 and J: The feature is to manufacture a multi-layered metal diaphragm. Hereinafter,
embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of a vapor deposition apparatus used in the method of manufacturing a
diaphragm according to the present invention. In the drawing, the inside of the container 1 is
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maintained approximately skillfully, and in the inside of the container 1, the block-like deposition
metal 3 held by the holder 2 and the jig 5 rotationally driven by the motor 4 are provided. It is
arranged. The jig 5 is formed in a shape according to the shape of the diaphragm to be
manufactured, and the metal evaporated by irradiating the surface of the "two parts of the metal
3 for vapor deposition" with an energy source such as an electron beam or the like The
diaphragm 6 is formed by Qfj on the upper surface of the jig 5 of FIG. Although this vapor
deposition apparatus has substantially the same structure as the conventional apparatus, it is
characterized in particular that it is possible to use a columnar shape as the metal 3 for vapor
deposition, whereby a multilayer metal diaphragm can be obtained. It is possible to form. Next,
the metal for vapor deposition used in the present invention will be described with reference to
FIGS. FIG. 2 shows a metal for vapor deposition used in the conventional vapor deposition
method, and a single or different metal is held in a crushed granular form or the like in a cupshaped holder 2.
When vapor deposition is carried out using this one metal, this metal is sequentially melted and
evaporated from the surface side by irradiation with electron Vino or the like, and dispersed in
the container 1. It is not easy to control the evaporation rate. Next, FIG. 3 shows a metal for
vapor deposition used in the present invention, and as is apparent from this figure, the metal 3
for vapor deposition is formed in a columnar shape, and a holder in the shape of a 4-shaped
frame is shown. As shown by the arrows from the lower side of 2, it is characterized in that it is
provided so as to be able to be sequentially lined up. The cross section of this vapor deposition
metal 3 is illustrated in FIG. In this example, the two metals A and l) are arranged in layers
alternately in the water] 'force direction. Therefore, different metals can be alternately dispersed
in the vapor deposition apparatus by irradiating the top surface of the vapor deposition metal 3
with the energy source in the vapor deposition apparatus and sequentially evaporating it. The
metal can be stably supplied by moving the vapor deposition metal 3 upward sequentially with
respect to the holder 2 according to the evaporation of the metal in a small size, and the amount
of projection of the vapor deposition metal 3 from the holder 2 is controlled. This also makes it
possible to control the concentration of metal vapor in the vapor deposition apparatus. FIG. 5
shows an example of a diaphragm manufactured according to the manufacturing method
according to the present invention. As apparent from this figure, the metal layer is formed
sequentially from the lower layer portion according to the change of the composition of the
metal vapor in the vapor deposition apparatus. The portion between single metal layers of each
metal, which is shown by hatching, is an alloy of the metal forming the layers on both sides, and
continuous change of composition can be obtained. The multi-layered metal diaphragm formed in
this manner exhibits excellent acoustic characteristics as compared to a single metal diaphragm,
but there is a risk that the layers may separate due to the formation of an alloy between the
individual layers. However, it is an advantage that sufficient heat resistance and durability for
stress such as small heat and pressure can be obtained. For example beryllium and aluminum as
two metals. In case of using IJIJ um single substance low density. The mechanical strength can be
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improved while maintaining the property of high rigidity, and in the case of manufacturing a
diaphragm using dimension beryllium and copper, the resonance frequency of the diaphragm is
dispersed to improve the properties. The effect is on dogs. As described above, the method of
manufacturing a diaphragm according to the present invention can extremely easily form a
multi-layered diaphragm, and the layer thickness of each layer of the diaphragm formed on / I'j
and N, t11 The value of the ratio of the body metal layer to the alloy layer can be obtained as
desired by controlling the thickness of the metal for vapor deposition and the rate of ascent at
the time of vapor deposition.
It is also possible to use three or more types of metals for the vapor deposition, and in order to
arrange each metal layer in a columnar shape, a method such as integration by caulking from the
outside can be adopted. 4 、 簡 の 1.1. 1 shows an example of a vapor deposition apparatus used
in the method of manufacturing a diaphragm according to the present invention, FIG. 2 shows an
example of a conventional metal for vapor deposition, and FIGS. 3 and 4 show the same. The
figure which shows an example of the metal for vapor deposition used in this invention, FIG. 5 is
sectional drawing EndPage: 2 of an example of the manufactured diaphragm. Explanation of the
symbols of the main parts 1 .. 4 containers 2. Bending times-3 .. .. metal for deposition 4.
Diaphragm Applicant Pioneer Corporation Attorney Attorney Motomura Fujimura '7-Tai / Figuo
2 Figure 2 and Figure 3 Figure 2 EndPage: 3
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