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The present invention relates to an excellent nine-compound loudspeaker diaphragm having
excellent acoustic characteristics and a method for producing the same, which has a laminated
structure in which a K 710 layer and a lead-free layer are sequentially provided on a T1
substrate. The performance of the loudspeaker is largely governed by the characteristics of the
diaphragm. As such a speaker diaphragm material, a thin metal, a thin metal, a thin film, a paper,
a plastic film, etc. of a metal such as metal, Tl, B, etc. or a small amount of an element for
modification is added thereto. However, the% /% separation-6 diaphragm material is not
necessarily satisfactory. B) Light weight and high elasticity, mouth] Sound propagation velocity
(hereinafter referred to as single # C "sound velocity") Characteristics such as large scale and
vibration damping should be appropriately large (ie, q value should be appropriately low), but
conventional materials are required to have characteristics that sufficiently satisfy these
characteristics. It's not. That is, a thin metal plate such as T1 is lightweight and has high elasticity
and high sound velocity, but has a defect that the q value is large. For this reason, resonance is
likely to occur at a specific frequency, and so-called metallic noise is generated, Vh, paper, and
plastic films have small q values, but have small sound velocities and small elasticity. Attempts
have been made to solve the drawbacks of the above-described diaphragm material made of a
single material by means of a composite material. For example, if a paint, silicone oil or the like is
applied on a Ti diaphragm, a diaphragm with a reduced q value can be obtained. However, in this
case, the speed of sound is also reduced, and there is a drawback that the extension of sound in
the high range is reduced. On the other hand, it is also known to carbonize the surface layer of a
Ti-made diaphragm or to form a carbide layer or an oxide layer and to cermet it to form a
composite diaphragm (for example, JP-B sJ-xi, vat, JP-A However, in these cases, although the
speed of sound is increased and the high-pitched sound expansion is further improved, the q
value is hardly improved but is increased by 6 for T1. The inherent disadvantages of diaphragms
are not excluded. The present invention, except for the disadvantages of the Ti-based diaphragm
as described above, is a composite diaphragm of a pressure-laminated structure with a q-value
being lowered by reducing the q value without reducing the sound velocity of the Ti-based
diaphragm. And K the purpose of which is to give a suitable process. As a result of research
conducted for the above-mentioned purpose, the present inventors formed a nine-pressure-point
lead layer on a .tau.10 layer of a composite diaphragm in which 710 layers are formed on a T1
metal substrate obtained conventionally. It has been found that a composite diaphragm with
extremely excellent acoustic characteristics can be obtained.
The speaker diaphragm according to the present invention is based on such findings, and more
specifically, it comprises a titanium (T1) -based metal plate molded into a diaphragm shape, and
a% Tie layer and a graphite layer sequentially provided on the metal plate. And is characterized.
The present invention also provides a suitable method of manufacturing the above-mentioned
speaker diaphragm. That is, in the diaphragm having the above-described structure, in principle,
graphite is deposited under relatively weak conditions by a method similar to the technique of
carbonizing the surface layer of a Ti-based metal plate, and the interface between the graphite
layer and the Ti-based metal plate It is obtained by forming 710 layers by mutual diffusion in the
vicinity, and leaving a graphite layer on the surface. In this case, the 710 layers do not
necessarily constitute a single layer, and there may be cases where the TiC phase and the T1
phase are mixed to form a mixed layer, even in such a case, In the present invention, the effects
of the present invention are exhibited. We made titanium-based metals for this purpose by
pyrolysis of hydrocarbons under controlled conditions. That is, in the method of manufacturing
the speaker diaphragm of the present invention, the titanium-based metal plate molded into the
diaphragm shape is placed in a gas atmosphere containing hydrocarbon S, SO volume, pressure
o, oot to 1 atmosphere and hydrocarbon is Pyrolyze at a temperature of oo -too ° C, deposit the
resulting graphite on the titanium-based metal plate, and form 710 layers by mutual thermal
diffusion between the formed graphite layer and the titanium-based metal plate It is something
that is important to do. Hereinafter, the present invention will be described in more detail. FIG. 1
is a cross-sectional view showing a conceptual laminated structure of a speaker diaphragm
according to an embodiment of the present invention. That is, the diaphragm of this example is
formed by sequentially providing a TiO layer and a graphite layer 3 on a Ti-based metal plate 1
formed in a dome shape. In addition, I is an end support member used at the time of
manufacture. Of course, the shape of the diaphragm is not limited to the dome shape as shown,
but may be other shapes such as conical or frusto-conical. Moreover, it can be provided on the
lower surface of the TiC1 core, the graphite layer 3Fi, and the Ti-based metal plate l. The
manufacturing method of the speaker diaphragm of this invention as a suitable manufacturing
method of the said speaker diaphragm is demonstrated in relation to the material of each part.
First, a Ti-based metal plate formed into a diaphragm shape is prepared. As a Ti-based metal, in
addition to T1 alone, a T1-based alloy containing Ti as a main component and, depending on
necessity, an element such as molybdenum or V up to a single noble metal is used. The thickness
of the metal plate can be determined arbitrarily depending on the size of the speaker, the
application and the like, or the thickness of the excess lO to coverage is optimum.
Next, the Ti-based metal plate is introduced into a pyrolysis furnace. After evacuating the furnace
to a predetermined pressure, an inert gas is introduced and heating is performed by RF heating
or the like to a predetermined temperature within the range of 0-99 ° C., and when the
predetermined temperature is reached, methane, ethane, ethylene The reaction gas is diluted
with an inert gas to obtain a 5-SO volume of reaction gas, and the reaction pressure is 10
minutes at a predetermined pressure! Temporarily heat-treated to form a graphite layer of K300
m to S- on the metal plate by thermal decomposition and to cause interdiffusion of T1 and 0
between the graphite layer and the metal plate to form an intermediate T10 layer (T10 phase)
Form a mixed layer of T1 and T1). What is important in the present invention is to control the
deposition rate and the correlation diffusion rate of carbon to form a laminated structure in
which an intermediate T10 layer and a surface graphite layer are formed on a metal plate. In
general, formation of such a laminated structure is determined as follows. First, the formation of
a surface-heated lead layer can be carried out by the following method: X @ preceding
photoelectron spectroscopy XPa or F1180 It is determined by being in the range of V. If this
binding energy is less than sts, s @ v, carbon becomes nearly soot-like and the q-value reduction
effect becomes poor, and if it exceeds -ts, j @ v, carbon has a hexagonal crystal structure and the
magnitude of internal friction is large. It changes from a graphite structure to a highly covalent
compact structure, and the effect of q value reduction decreases. Also, it is not necessary that the
desired T10 layer (stoichiometrically strict TiO is formed, and it is considered that T1 and KO are
in a mixed state. Further, as is apparent from the forming method, the boundaries between the
surface graphite layer and the metal plate do not have to be 11 'as shown in FIG. The formation
of) is determined by the fact that the intensity ratio R of X-ray diffraction peaks defined by the
linear equation is /%-a9g. Engineering Ti (/ 10) + 1 5 (tos) + 1 i (コ OO) + 1 Ti (/ l) + 1? More
specifically, the control of the 1 (aOz) + I terocitt) + Itio (cooo) + 1Tia (1 ユ O) + o te so (/ 1s)
reaction is carried out so that 01- and R fall within the above range. It is important that it be
carried out or generally within the range of reaction conditions described above. That is, if the
pressure of the reaction gas is less than 9.001 atm, the pressure-generating lead layer is entirely
changed to the T10 layer, and the effect of the q value reduction is lost. Further, if the pressure
exceeds the atmospheric pressure, soot will be generated, and C18 of the surface layer will be
cot3. It becomes smaller than r @ v.
If the concentration of hydrocarbons in the reaction gas is less than sb, the reaction time is too
long, and if it exceeds 50-, soot is given in Table 1iii! L occurs. If the reaction temperature is less
than 100 ° C, effective thermal decomposition and thermal diffusion do not occur, and if it
exceeds 900 ° C. The diffusion of 0 and T1 progresses too much, and there is no layer 0 and the
q value increases. If the deposited graphite layer (including TiOK changed part) or less than soo
X, the effect of q value reduction is scarce, and if it exceeds 3-, TiO conversion progresses too
much and R exceeds a% and q value increases The interface bond of O-TiO-Ti weakens, the
diaphragm becomes brittle and practically difficult to use. The diaphragm thus obtained is
particularly suitable as a diaphragm for middle and high-pitched speakers due to its
characteristics. As described above, according to the present invention, since the IC layer and the
lead-free layer are formed on the Ti-based metal plate formed in the shape of the peristaltic plate,
the sound speed of the Ti-based metal single diaphragm is not reduced. Rather, an improved and
better-suited composite speaker diaphragm is provided, as well as its preferred method of
manufacture. The present invention will be described more specifically by the following
examples. Example 1 A support member J is attached so as to contact the end of a metal plate
(thickness vIA + @) formed into a dome shape as shown in FIG. 1 Ki, and the apparatus shown in
FIG. The high frequency oscillator is set at a predetermined position in the heating furnace,
exhausted through the valve S, and flows an appropriate amount of argon gas through the flow
meter 41? Heat the furnace and when it reaches qzo ° C, adjust the argon gas flow rate to 111
minutes, introduce propane at a flow rate of q4ooa 1 minute through the flow meter 6b, and set
the pressure at 1 atm. went. After reaction of the layer, propane was stopped and cooled to
obtain a diaphragm (sample /). In FIG. 2, t is a pressure gauge, and 9 is a vacuum bonder used in
the pressure reduction reaction. The X-ray diffraction pattern of the obtained diaphragm is as
shown in the f4s diagram, and the values of Rb and s% were obtained. The 180 μm spectrum of
the surface Wi point lead layer of this diaphragm was as shown in FIG. In addition, the obtained
graphite layer thickness (including the T10 layer thickness) was about 3 μm. Sample 0 and
sample J were obtained by the same method as that of the 0th sample 1 except for the following
conditions. Sample 2: Two temperatures 100 ° C., Arbo 14 minutes, Propane / 100Co 7
minutes, 9 minutes Sample 3: Temperature 120 ° C., argon td 1 minute, Prohan / goo ec 7
minutes, 9 minutes, R, 0, 11 A vibrating plate of (Sample C) and R- 瀝 (Sample 3) was obtained.
If it is the sound speed measured about the said diaphragm pressure, a UicQ value will be shown
in the following table with that about the said T1 metal plate single-piece | unit. According to the
results in the above table, in the diaphragm (sample /) obtained according to the present
invention, the Q value is effective regardless of the sound or rather increasing K compared to the
case of the Ti thin plate alone. It can be understood that the
Brief description of the drawings
FIG. 1 is a cross-sectional view showing a conceptual laminated structure i of a loudspeaker
diaphragm according to an embodiment K of the present invention, and FIG. 2 is a layout
diagram of a device used in an example of the loudspeaker diaphragm manufacturing method of
the present invention.
FIG. T3 and FIG. X are respectively an X-ray diffraction no-turn and a 180-m spectrum of the
speaker diaphragm according to one embodiment of the present invention. I: Ti-based metal
plate, co: T10 layer, 3: graphite layer, Hiro: heating furnace, 4ts, 4b: flow meter,? ... High
frequency oscillator, I ... end support member. Applicant agent 清 股 1 Fig. 1
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