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The present invention relates to a method of manufacturing a ceramic diaphragm acoustic
diaphragm. Ceramic powder 4 on the surface of an aluminum substrate formed in the eJ1 cone
shape as a conventional method of manufacturing a diaphragm made of ceramic! By thermal
spraying and coating to obtain a diaphragm integrated with the aluminum base, or by a method
of coating all molds coated with ceramic powder on the surface of a cone-shaped mold [7] Is due
to [7 or [7, in the case of this method of obtaining a ceramic diaphragm by coating by thermal
spraying, the formed ceramic film is porous and it is difficult to obtain a dense and thin
continuous film; Equipment cost and operation cost, and material loss is also large, so that an
inexpensive ceramic diaphragm can not be obtained, and a method of demolding on a ceramic
film ′ sprayed like the latter of the prior art example . Direct bonding of the ceramic film to the
mold is very difficult in practice to be directly released because of its strong bondability to the
mold. Object of the present invention 1 The above-mentioned conventional drawbacks are all
solved and no special device is required. The CERA Link diaphragm KURAyasu fiK large fjkt ζ
can be manufactured by a simple force method, and it is set to any thickness on a smooth
surface. It is an object of the present invention to provide a method of manufacturing an acoustic
diaphragm capable of obtaining a ceramic diaphragm that can be used. Another object of the
present invention is to provide a method of manufacturing a diaphragm capable of obtaining a
ceramic diaphragm integrally provided with a σ-case coil and an edge member. An embodiment
of the present invention will be described with reference to the whole drawing with reference to
VC1 Fig. 1 (^). A cone-shaped mold I made of metal material such as aluminum and iron is
manufactured by The surface of the mold 10 is overcoated with a plastic film 2af vacuum
forming machine. Any plastic film 2a may be used as long as it can be squeezed, and inexpensive
human materials such as vinyl chloride, styrene, polyester and AHa can be used. By releasing the
mold from the mold as shown in the following vr (0) 'vc, two types of diaphragms for silastics can
be obtained. Thus, the mold 1? It is manufactured into a large number of diaphragm molds 2 as a
seventeen matrix (FIG. 1 (D)). Rough surface f (formed by surface blasting or sanding of the
diaphragm mold 2). Since the purpose of this purpose is the silastic type 4-r type, if the surface is
smooth, the solution-like ceramic will repel in the form of water beads. The formation of a rough
surface can be applied uniformly to any solution of eri solution like ceramic.
Only L7 this state IJ does not mean a complete "wet" phenomenon to work as described later.
Next VC 24 iih! IJ & type 2 i, r: J -7 shape k 'lt L (Because I show the neck part vc 7 I? イスコイル
3. In detail, t gobo pin portion t, and edge portion VC edge member 4 are respectively
disposed. In this state, as shown in (F), a solution-like ceramic is applied and coated on the
surface of the mold, and the double-cage coil 3 and the edge member 4 # / r are also applied in
an integrated VC bonding process. As the solution-like ceramic, a water-soluble low heating type
(about room temperature curing to about 200 ° C. curing) alumina-based or silica-based
ceramic is used. Coating cords, brush coating, spray method, flow coater, etc. are optional, and
they can be freely set according to the thickness of the diaphragm to be obtained as the film
thickness. In this state, the film is placed and dried at a room temperature, for example, at room
temperature for 2 to 3 hours, and temporarily cured to form the diaphragm film 5. In this case, it
is possible to shorten the drying time by heating and drying. Next, releasing the mold 2 for the
diaphragm from the mold 2 shown in (G) provides the diaphragm member 6 of the ceramic ring
provided with the wxpz chair coil 3 and the edge member 4, but in this case, it is easy to release [
Get 'n'. This is because "wetting" penetrates the ceramic and the plastic originally, and the
ceramic is contained in the mouth of the rough surface of the single rc type "2", and the
appearance is only 1 wet. In addition, when the deno-de- of the diaphragm is tight and the mold
release is fast, K can be softened by making the diaphragm mold two pieces rrx easy rmt type.
This point is an advantage due to the fact that the diaphragm mold is a silastic type and the
spreading type of solution ceramic, and the above-mentioned drafting resistance is not good. The
mold can also be released. Next, the above-mentioned diaphragm member 6 is heated in the
heating furnace 7 to cure one piece to show π ([1) vc]. The heating vorticity and the heating fllj
are about 50 ° C. to 150 ° C. for about 1 hour, whereby the ceramic is completely cured and (I)
ir as shown in 7J? The diaphragm A of the ceramic ring integrally provided with the chair coil 3
and the edge member 4 is obtained. FIG. 2 is a comparison diagram of the sound pressure
frequency characteristics of the diaphragm manufactured by the above-described process and
the conventional paper cone diaphragm B. The ceramic diaphragm A is extremely excellent also
in strength. It turns out that According to the manufacturing method of the acoustic diaphragm
of the present invention, the vibration of the ceramic ring can be mass-produced inexpensively
without using any special device, and the diaphragm having a smooth surface without any
porous sigma unlike the thermal spraying method. It can be done.
In addition, it is possible to obtain a diaphragm in which the whole is made of ceramic, which is
superior in characteristics and excellent in heat resistance, moisture resistance, weather
resistance and the like. In addition, conventionally, it is necessary to separately bond to the coil
and the edge member separately, and in the present invention, a diaphragm in which these are
integrally joined to one another in the present invention can be obtained. There is almost no il, ti
at all, such as the occurrence of distortion based on the drop. Furthermore, the thickness of the
two-diaphragm film can be set arbitrarily, and since there is no fear of re-porosity different from
the thermal spraying method, it is possible to obtain a very thin diaphragm.
Brief description of the drawings
The drawing is a friend to explain all the embodiments of the method of manufacturing an
acoustic diaphragm according to the present invention, i 1 a a sectional view of the apparatus for
explaining each process order, and FIG. 2 is a comparison characteristic view .
l: Metal, 2a: Plastic film. 2 · · · Plastic diaphragm type, 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
ceramic diaphragm coating, 6 · · · diaphragm. Patent Applicant Trio Corporation