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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker, and more particularly to a diaphragm for a speaker provided with a
ceramic layer on the surface of a diaphragm base. [Background Art] Conventionally, the
characteristics required for the material of the diaphragm of the speaker are: 1; the density rho is
as small as possible 2; the elastic modulus E is large; It is necessary to be wide 3 and the internal
loss is appropriately large. Although a diaphragm made of paper, resin, metal or the like is used
to satisfy these various requirements at one time, these materials have features but they also
have disadvantages, so as to compensate for the disadvantages. It is extremely rare to be used
alone, and many are used as a mixture or complex with other materials. In recent years, in order
to improve the characteristics of the diaphragm, an oxide-based ceramic layer such as alumina,
titania or zirconia is formed on the diaphragm base of a metal thin film, and the internal loss
tanδ is increased due to high rigidity and complexation. A diaphragm that has been developed
has come into use. However, in order to satisfy the above-mentioned conditions required as the
material of the diaphragm of the speaker, carbonized or non-oxide ceramics such as nitride
ceramics are more preferable than the oxide ceramics described above. Its properties are
preferred. The following table shows the physical times f'l of oxide ceramics and 11 oxide
ceramics. As described above, the non-oxide ceramics C and the oxide ceramics have lower
density and higher elastic modulus and thus have excellent characteristics. [Problems to be
Solved by the Invention] However, when non-oxide ceramics are sprayed in popularity, most of
them react with oxygen in the popular atmosphere before reaching the diaphragm base U, and
most of them are oxide systems. There is a disadvantage that it becomes a ceramic or is
thermally decomposed by the high temperature of plasma spraying. Therefore, when spraying
non-oxide ceramics, it has been necessary to spray the entire apparatus or the entire room as an
inert gas atmosphere. To make the whole room into such an atmosphere, the mass productivity,
which is an advantage of thermal spraying, is lost, and eventually it becomes very expensive and
becomes impractical. [Object of the Invention] The present invention is for removing the abovementioned drawbacks of a conventional diaphragm for a speaker using a ceramic, by thermally
spraying particles obtained by coating a non-oxide ceramic with an oxide ceramic. In addition to
the characteristics of non-oxide ceramics, it is an object of the present invention to measure the
direction of the characteristics more than a diaphragm provided only with an oxide ceramics
[Summary of the invention] In order to achieve the object of the above iiR, the present invention
plasma-sprays particles of non-oxide ceramics coated with oxide ceramics on a diaphragm
substrate of metal thin film ". The present invention is summarized as forming a ceramic layer.
invention will be described below with reference to the drawings. FIG. 1 shows plasma spraying,
and 1 is a metal substrate of aluminum foil of I ¥ 4011 molded into a diaphragm shape, and after
degreasing and cleaning treatment, abrasive powder is sprayed on the surface to carry out plast
treatment It has been done. A plasma spray apparatus 2 is maintained at an electric potential as
shown in the same figure, and a thin N layer of Aff, 03 (alumina) is formed on the surface of
powder particles a of SiC (silicon carbide) as shown in FIG. The particles provided with soot are
injected from the injection 1] 3 and sprayed toward the metal substrate 1 together with the air
blown from the air blowing port 4 to form the alumina coating layer 5 of 35 to 45 μm. At this
time, the metal substrate 1 is rotated as shown by the arrows in FIG. 1 so that the ceramic
particles sprayed onto the metal substrate 1 adhere uniformly. As a technique for forming a thin
covering layer of oxide ceramic on the surface of the powder particle a of the non oxide ceramic,
the non oxide ceramic powder is put in a metal oxide sol solution, and metal oxidation is carried
out on the surface A method such as a granulation method for attaching a substance or a method
for attaching 11 metal oxides to the surface of a non-oxide ceramic powder by ion plating is
used. Thus, as shown in FIGS. 3 and 4, the coating layer 5 of ceramic particles in which non-oxide
ceramics are covered with a thin film of oxide ceramics is formed on the surface of the metal
substrate 1 is there. "Sl 3 Na (boron nitride) may be used in place of SiC of the non-oxide
ceramics of the two examples, and their physical properties and physical properties when only
alumina is sprayed on the surface of aluminum foil The characteristic ratios are shown in the
table below. Thus, the specific gravity is lowered and the Young's modulus is improved, as
compared to the thermal spraying of the alumina base. [Effects of the Invention] As described
above, according to the present invention, ceramic particles in which non-oxide ceramics are
covered with a thin covering layer of oxide ceramics are sprayed onto the surface of a
diaphragm-shaped metal substrate, A coating layer of ceramic particles is formed. Accordingly,
the covering layer has physical properties intermediate between non-oxide ceramics and oxide
ceramics, and the density becomes smaller and the elastic modulus is improved compared with
oxide ceramics.
Therefore, weight reduction and rigidity, and appropriate internal loss are measured, and it is
possible to perform a screw movement to a high range as a diaphragm of a speaker, and the
frequency at which the divided vibration in the high range is stored is audible 2 The frequency
characteristics in the frequency band can be flattened. Moreover, it can also contribute to the
improvement of the efficiency as a speaker.
Brief description of the drawings
FIG. 1 is a schematic view showing plasma spraying in the present invention, FIG. 2 is an
enlarged cross-sectional view of ceramic particles to be sprayed, and FIGS. 3 and 4 are crosssectional views of a product and a part thereof.
1 ... metal base, 5 ... ceramic layer, a ... non oxide ceramic, b ... oxide ceramic.
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