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JPS63143000

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DESCRIPTION JPS63143000
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a ceramic diaphragm for a speaker. (Prior art and its problems) In
general, in the diaphragm of an electrodynamic speaker, the mass of the vibrating portion
comprising the voice coil, the diaphragm or the like is reduced or the diaphragm is It is
conceivable that the rigidity (stiffness) of the top (neck) is largely selected. In order to increase
the rigidity of the top of the diaphragm, it is conceivable to increase the thickness of the
diaphragm. However, if the diaphragm is uniformly thickened, the mass of the vibrating portion
increases and the high resonance frequency is lowered, It is the opposite effect. Therefore, a
thick diaphragm at the top of the diaphragm and a thin diaphragm at the periphery are required.
On the other hand, it may be acoustically advantageous that the diaphragm +9 decreases
sequentially from the periphery to the top. Thus, it is desirable that the thickness of the
diaphragm can be varied depending on each part due to acoustical requirements. In order to
meet such requirements, it is easy to change the thickness depending on the portion of the
diaphragm in a diaphragm made of paper obtained by papermaking, that is obtained by draw
molding, etc., and a diaphragm meeting the requirements can be obtained. However, in the case
of a diaphragm in which a ceramic layer is formed by PVD (physical vapor deposition), CVD
(chemical vapor deposition) or plasma t2F on a metal diaphragm or a metal diaphragm by press
molding, the physical properties are controlled. It is very difficult or impossible to change the
thickness. (Means for Solving the Problems) The present invention has been proposed to solve
the above problems, and a high sound resonance frequency can be obtained by forming a
ceramic base on a metal substrate and changing its thickness as necessary. An object of the
present invention is to provide a method of manufacturing a ceramic processing diaphragm
enhanced. That is, in order to achieve the above object, the present invention relates to a method
of manufacturing a ceramic-treated diaphragm in which ceramics are formed on the surface of a
11-05-2019
1
gold r / Am body having a diaphragm shape by an electrolytic deposition method. A method of
manufacturing a ceramic-treated diaphragm is characterized in that the thickness of the
diaphragm is partially changed through a step of forming a multilayer ceramic by masking with a
disuse agent I. The present invention will be described below with reference to the drawings. In
the present embodiment, a description will be given of one in which the thickness of the
diaphragm decreases sequentially from the top to the periphery. FIG. 1 (a) or (c) is a partial
sectional view for explaining steps of an embodiment of the present invention. The electrolytic
deposition method (hereinafter referred to as the electrodeposition method) will be described in
bonds.
First, a metal substrate 1 made of aluminum with a thickness of 50 μm formed into a cone
shape is prepared, and a first ceramic layer 2 having a size of 5 μmq in FIG. Next, in FIG. 6B, the
peripheral portion 7 (IllI is masked with the resist agent 3), and a second ceramic even 4 having
a thickness 511Ill is formed by electrodeposition. Further, in the figure (c), the masking on the
peripheral portion 7 side is enlarged by resist [• agent 5, and a third ceramic layer with a
thickness of 5 μm is formed by an electrodeposition method. Subsequently, when the resist
agents 3 and 5 were removed, as shown in FIG. 2, a diaphragm made of the ceramic film 9
having a thickness changed in the peripheral portion 7 and the top portion 8 was obtained. In
this example, a diaphragm having a thickness of 60 μm at the periphery and a thickness of 80
μm at the top was obtained. Next, the electrodeposition method is described. As the electrolytic
bath composition, use sodium aluminate 300, 'e aqueous solution, immerse in the electrolytic
bath with the aluminum metal base as the anode and the iron plate as the cathode, hold the
anode Ti flow density at 1 / d m 2, direct current A current was continuously applied to form a
ceramic layer of 5 μm thickness for 20 minutes, and then resist (masking with a material was
applied repeatedly to obtain a desired i-motion plate. Although an example in which aluminum
oxide is formed as the aluminum gold g1 body is shown in the embodiment, it is apparent that
the invention can be applied to a method of forming various ceramic layers in addition to
forming a silicon oxide layer. (Effects of the Invention) As described above, according to the
present invention, at least once in the method for producing a ceramic-treated diaphragm in
which the ceramic layer is formed on the surface of the metal substrate having the shape of the
diaphragm by electrolytic deposition. As described above, the thickness of the specific portion of
the diaphragm is changed by multiplexing the ceramic layers of the specific portion of the
diaphragm through the process of forming a multilayer ceramic by masking with a resin i /
agent, and various acoustical requirements The ceramic processing i work board which sets
“A” is obtained.
[0002]
Brief description of the drawings
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2
[0003]
FIG. 1 is a partial cross-sectional view for explaining a process of an embodiment of the present
invention, and FIG. 2 is a partial cross-sectional view of a diaphragm.
1 · · · Gold R body, 2.4.6 · · · Ceramic layer, 3, 5 · · · Resist agent, · · · · · · · · · · · · · · · · · · · · · · · · ·・ ・
・ Ceramics film attorney Patent attorney Michio Takayama; "1 ・ 2 top-1 other person
11-05-2019
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