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JPS63226197

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DESCRIPTION JPS63226197
[0001]
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 sound suitable for a
diaphragm of a tweeter or a speaker for a squawker. (B) Prior Art Conventionally, in the
diaphragm used for the speaker, a method of increasing the rigidity of the diaphragm has been
adopted in order to improve the high frequency characteristics of the speaker and the sound
quality. Various methods are known as methods for increasing the rigidity of the speaker
diaphragm. For example, it is known that a surface layer made of an inorganic material is formed
on the surface of a metal diaphragm substrate by an ion plating method or a plasma CVD method
(chemical vapor deposition means). Further, as in the cross-sectional view of the acoustic
diaphragm shown in FIG. 3, the first surface layer 2 and the second surface layer 3 are made of
different materials on the surface of the metal diaphragm base l. Attempts have been made to
further improve the acoustic properties by forming in multiple layers. (C) Problems to be Solved
by the Invention However, in the above-described conventional devices, there is a problem in the
increase in diaphragm weight and the adhesion strength between layers of different materials
regardless of the method. Furthermore, there is a problem in mass productivity because the
surface layer is formed in multiple layers using different materials. An object of the present
invention is to provide an acoustic diaphragm which overcomes the disadvantages of the prior
art. (D) Means for Solving the Problems The acoustic diaphragm according to the present
invention is formed of at least one surface of a metal diaphragm substrate, diamond, or diamond
and amorphous carbon, or silicon carbide The surface layer is formed by physical or chemical
vapor deposition. Further, the metal diaphragm base on which the surface layer is formed as
described above is subjected to hot isostatic pressing to form an intermediate layer composed of
the surface layer material and the metal layer material, thereby solving the problem. I am trying.
(E) A metal diaphragm material having a surface layer formed by functional physical or chemical
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vapor deposition means is subjected to a hot isostatic press to obtain a metal layer material and a
surface layer material of the metal diaphragm substrate. An intermediate layer made of a pixel
material can be formed on the bonding surface with the above. (F) Embodiment An embodiment
of an acoustic diaphragm according to the present invention will be described based on FIGS. 1
(A), (B) and FIG. FIG. 1 (A) is a dome type in which diamond, or diamond and amorphous carbon
are formed on one surface of a metal diaphragm base 1 by ion plating or plasma CVD. It is
sectional drawing which shows the state in the middle of comprising a diaphragm.
In FIG. 1 (B), the metal diaphragm base 1 on which the surface layer 4 is formed as shown in FIG.
1 (A) is subjected to hot isostatic pressing and is made of a metal layer material and a surface
layer material. It is sectional drawing which shows the state which formed the intermediate |
middle layer 5 and comprised the dome-shaped diaphragm. FIG. 2 shows another embodiment, in
which surface layers 6a and 6b are formed on both sides of the metal diaphragm substrate 1, and
both surface layers 6a and 6b and the metal diaphragm substrate 1 are used. It is sectional
drawing which shows the state which formed intermediate | middle layer 7a, 7b, respectively,
and comprised the dome shaped diaphragm between. First, the manufacturing process and the
like of the acoustic diaphragm according to the present invention will be specifically described
using FIGS. 1 (A) and 1 (B). In the stage shown in FIG. 1 (A), a surface layer consisting of diamond
and amorphous carbon by ion plating means using graphite as a raw material on one surface of
metal diaphragm base 1 made of titanium (Ti) 4 are formed. The conditions are as follows. (2)
The metal diaphragm base 1 made of titanium (Ti), for example, 25 μm thick, was washed, and
set so that the surface layer 2 was formed on one side. ■ Vacuum evacuation: 1O-6 (Torr) or less
■ Ion bombardment: Argon atmosphere 5 X 1 O-2 (Torr) 0.2 to 0.6 KV for 10 minutes ■ Ion
Brating; Mixed gas of argon and hydrogen (Torr) Deposition rate 200 (person) / min. Cooling: left
for 30 minutes Cooling The surface layer 4 formed by ion plating as described above is made of
diamond and amorphous carbon. Further, a hot isostatic press (HTP method) is applied. It is as
follows when the conditions at the time of giving the hot isostatic press which is a high
temperature and high pressure press are shown. ■ Atmospheric gas; Argon (Ar) ■ Set
temperature near 00 ° C ■ Heating rate: 5 ° C ■ Holding time: 1 hour ■ Holding pressure;
l000 Kg / cm2 ■ Temperature lowering rate; 3 ° c / min as above The intermediate layer 5 is
formed between the metal diaphragm substrate 1 and the surface layer 4 by using the hot
isostatic pressing process of That is, an intermediate layer 5 made of titanium carbide, which is a
material of the diaphragm substrate 1, diamond, which is a material of the surface layer 2, and
amorphous carbon, produced by a diffusion reaction is formed. The formation of the
intermediate layer 5 can be confirmed by electron beam diffraction and photoelectron
spectroscopy. As is apparent from the above embodiment, the surface layer 4 made of diamond
and amorphous carbon is formed on the surface of the base material 1 due to the metal vibration,
and the metal diaphragm base material 1 and the surface layer 4 are formed. It is hardened by
the intermediate layer 5 formed by the diffusion reaction, and further, because there is no
increase in weight, the high frequency characteristics become extremely excellent, and the
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adhesion between the surface layer 4 and the metal diaphragm substrate 1 is It is highly reliable
because it improves, and it is optimal as a diaphragm for tweeters and speakers for squawkers.
FIG. 2 shows a second embodiment, wherein both surfaces of the metal diaphragm substrate 1
are carbonized by the same steps as the embodiments described in FIG. 1 (A) and (B). Surface
layers 6a and 6b made of silicon are formed, and further, intermediate layers 7a and 7b are
formed between the both surface layers 6a and 6b and the metal diaphragm base 1 by hot
isostatic pressing, respectively. , And a dome-shaped diaphragm. (G) Effects of the Invention
According to the diaphragm for sound of the present invention, the surface layer is formed of
diamond, diamond and amorphous carbon, or silicon carbide, so it is a surface layer with a
thickness of about 0.8 a. Even in this case, the propagation speed of the acoustic diaphragm can
be increased to 8000 m / s or more. In addition, since the intermediate layer can be formed by
the effect of the hot isostatic press, it becomes possible to construct an acoustic diaphragm
having an acoustic characteristic of 9000 m / s, and the frequency characteristic in the high
range is remarkably improved. Of course, since there is no increase in weight, it is possible to
exert an excellent effect particularly as a diaphragm of a tweeter or squawker speaker.
Furthermore, since it is not necessary to form the intermediate layer separately by means such as
vapor deposition, a highly efficient speaker unit can be provided.
[0002]
Brief description of the drawings
[0003]
1 (A), (B) and FIG. 2 are cross-sectional views showing an embodiment of the acoustic diaphragm
according to the present invention.
FIG. 3 is a cross-sectional view showing a conventional example. 1: metal diaphragm base
material 2: first surface layer 3: second surface layer 4: surface layer 5: middle layer 6a, 6b:
surface layer 7a, 7b: middle layer patent applicant Kenwood Corporation 1 Figure (A)! 3 Figure
112
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