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JPH10150695

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH10150695
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a diaphragm of a dome-shaped speaker.
[0002]
2. Description of the Related Art Conventionally, a dome-shaped diaphragm 11 as shown in FIG.
3 (A) is used as a speaker unit for medium and high sound, and the diaphragm 12, voice coil
bobbin 13 and edge 14 are shown. After being formed separately and forming the coil portion 12
on the voice coil bobbin portion 13, these are adhered with an adhesive 15.
[0003]
As shown in FIG. 3 (B), a diaphragm base material in which the diaphragm portion 11, the voice
coil bobbin portion 12 and the edge portion 14 are integrally formed is proposed as a thing that
can be reduced in weight without loss of sound wave propagation in the high sound portion. ing.
As a result, the effects of conventionally used adhesives can be eliminated, and weight reduction
and stability can be greatly improved. However, there is a limit to the molding surface of the
material, and the propagation velocity of the sound wave In the early stage of the material, there
is generally little elongation and molding is impossible.
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[0004]
Therefore, we first deposit a deposited film 16 such as a high sound velocity material, such as
diamond, on the diaphragm portion 11 in order to increase the propagation velocity of the sound
wave and extend the frequency characteristics of the speaker to the high frequency range. We
propose what we have formed, and this has produced some results.
[0005]
However, when forming the coil portion by winding around the voice coil bobbin portion 13,
since the organic adhesive is adhered while adhering to the wire, in view of increasing the
propagation speed of the sound wave, this adhesive Can not eliminate the influence of
[0006]
In addition, although the diaphragm is ceramicized (mineralized) by the vapor deposition
treatment and easily broken, it is wound around the voice coil bobbin portion of the diaphragm
in the easily broken state, so that breakage or the like occurs in the winding step. There was a
point to be solved such as causing a defect.
[0007]
An object of the present invention is to provide a method of manufacturing a speaker diaphragm
which can solve the above-mentioned drawbacks of the conventional speaker diaphragm and can
easily manufacture a speaker diaphragm in which the speaker diaphragm proposed by the
present invention is further improved. .
[0008]
According to a method of manufacturing a loudspeaker diaphragm of the present invention, a
dome-shaped vibration comprising a diaphragm portion, a voice coil bobbin portion integrally
molded with the diaphragm portion, and a coil portion formed on the voice coil bobbin portion.
In a plate, after winding around a voice coil bobbin portion to form a coil portion, this is set on a
rotary radiator in a chamber of a plasma generating apparatus in thermal plasma CVD method
and the outer periphery of the coil portion is cooled by a cooling jig. A diaphragm, and a vapor
deposition film made of an amorphous diamond film or a crystalline diamond film so as to cover
an upper end portion of the coil portion from the diaphragm by being covered by vapor
deposition by a thermal plasma CVD method. I assume.
[0009]
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The diaphragm base and the voice coil bobbin are integrally formed to obtain a diaphragm base,
which is wound around the voice coil bobbin to form a coil.
This is set in a rotary radiator in a chamber of a plasma generator in a conventionally known
thermal plasma CVD method, the outer periphery of the coil portion is covered with a separately
manufactured cooling jig, and vapor deposition is performed by the thermal plasma CVD method.
As a result, a vapor deposition film of an inorganic material is formed to cover the diaphragm
portion and the upper end portion of the coil portion from the diaphragm portion, and the
surface of the organic adhesive in the coil portion is also covered with the vapor deposition film.
[0010]
According to this manufacturing method, since the vapor deposition process is performed in the
state where the coil portion is formed, the diaphragm substrate is not damaged in the winding
step.
In the speaker diaphragm thus obtained, the upper end portion of the coil bobbin portion and the
upper end portion of the coil portion as well as the diaphragm portion are covered with the
deposited film of the inorganic material. The sound wave propagation speed can be further
enhanced.
[0011]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic cross-sectional view of
a speaker diaphragm obtained by the method for manufacturing a speaker diaphragm according
to the present invention, and FIG. 2 is a thermal plasma CVD method used for the method for
manufacturing a speaker diaphragm. It is the schematic of the plasma generation apparatus in.
[0012]
In the figure, A indicates the entire speaker diaphragm, and the dome-shaped diaphragm portion
1, the voice coil bobbin portion 3 and the edge portion 4 are integrally formed to form a
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diaphragm base 10, and a wire is wound around the voice coil bobbin portion 3. Thus, the coil
part 2 is formed similarly to the conventional one, but the deposited film 6 of the inorganic
material covers the upper surface of the diaphragm part 1 and the upper end part of the coil part
2 from the diaphragm part 1 It is formed.
[0013]
Next, a specific manufacturing method of the above-mentioned speaker diaphragm A will be
described based on FIG.
As well known, in the thermal plasma CVD method (chemical transport method), the inside of the
plasma torch 21 and the chamber 22 for generating a thermal plasma is kept in vacuum by the
vacuum evacuation 25 and the source gas 23 is in a vacuum state. Supplied.
The adherend is set on a radiator 27 through which cooling water 26 circulates, and the radiator
27 is adapted to rotate.
[0014]
The plasma torch 21 discharges direct current between the electrodes formed by the anode
(anode) 21a and the cathode (cathode) 21b, and when the source gas is supplied, the deposited
film of the inorganic material is formed on the adherend. It is supposed to be.
[0015]
A diaphragm base material 10 in which titanium of 25 microns thickness is press-formed to
integrally form the diaphragm portion 1, the voice coil bobbin portion 3 and the edge portion 4
is obtained, and the wire is wound around the voice coil bobbin portion 3 The coil portion 2 is
formed.
This is set on the radiator 27, and the outer periphery of the coil portion 2 is covered with the
cooling jig 28.
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The source gas to be supplied is, for example, argon, methane, and hydrogen at a ratio of 100:
0.1: 7, whereby the thermal plasma CVD method is carried out from the upper surface of the
diaphragm portion 1 and the diaphragm portion 1 A crystalline diamond film is deposited over
the upper end portion of the coil portion 2 to form a vapor deposition film 6.
[0016]
According to the present invention, it is possible to increase the speed of sound by 10 times,
from 1700 m / s to 18000 m / s.
In the embodiment, a diamond film having the fastest speed of sound is formed by thermal
plasma CVD as the vapor deposition film 6, but similar effects can be expected if it is a material
having performance according to this, for example, aluminum oxide or carbonization Silicon,
boron, silicon carbide and the like can be mentioned, and this inorganic material can be expected
to have the same effect because it is 5 to 7 times the sound velocity of the adhesive. In addition,
the vapor deposition film 6 may cover the whole of the coil portion 2.
[0017]
According to the method for manufacturing a loudspeaker diaphragm according to the present
invention, in the loudspeaker diaphragm obtained, the bonded portion of the coil portion with
low sound velocity is covered with the deposited film of inorganic material with high sound
velocity, so transmission is achieved. The loss can be reduced, and the decrease in efficiency can
be ignored because there is almost no increase in weight.
[0018]
And since such a speaker diaphragm can be easily manufactured, and in particular, deposition
processing is performed after the coil portion is formed, there is a fear that the diaphragm may
be damaged when forming the coil portion as in the prior art. There is no.
[0019]
Brief description of the drawings
[0020]
1 is a schematic cross-sectional view of a speaker diaphragm obtained by the method for
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manufacturing a speaker diaphragm according to the present invention.
[0021]
2 is a schematic view of a plasma generating apparatus in the thermal plasma CVD method used
in the method of manufacturing the speaker diaphragm.
[0022]
3 (A) is a cross-sectional view of a conventional dome-shaped diaphragm, and FIG. 3 (B) is a
cross-sectional view of the dome-shaped diaphragm previously proposed by us.
[0023]
Explanation of sign
[0024]
A Loudspeaker diaphragm 1 whole diaphragm 2 coil 3 voice coil bobbin 4 edge 6 deposited film
10 diaphragm base 21 plasma torch 22 chamber 27 radiator 28 cooling jig
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