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1 、 Name of invention
Acoustic component and method of manufacturing the same
Detailed Description of the Invention The present invention relates to an acoustic component and
a method of manufacturing the same, which is lightweight and has a high Young's modulus (a
velocity of propagation of sound in a solid g (hereinafter referred to as the velocity of sound in
the present specification) It is an object of the present invention to provide a high (C speed ())
specific gravity acoustic component and a method for producing the same. In general, it is well
known that the use of a material having a high specific gravity at a high sound velocity leads to a
performance surface as an acoustic component such as a cantilever for pickup or a diaphragm
for a speaker. Therefore, conventionally, aluminum alloys or □ have metals such as titanium “I
!!” Because it was molded, the performance as an acoustic component was limited by the shape
and size. So-called high sound velocity materials that propagate sound at high sound velocities,
such as beryllium (B), which are generally used for acoustic components, are difficult to process,
so tapered cantilever cantilever pipes or especially high sound! Dome shaped vibration of Subi
voice! In the case of making a film, a molding method using a true g deposition method has
recently been used. This vacuum deposition is particularly suitable for the above-mentioned
cantilever or diaphragm because it is particularly suitable for the above-mentioned cantilever or
diaphragm because it is mass-producible to small parts with EndPage: 1 and can be molded even
if the surface shape is somewhat complicated. However, in order to obtain a practical thickness C
thickness) by a vacuum deposition method, a high deposition rate is required. As a vacuum
deposition material that can obtain this high deposition rate, aluminum (At) is known (old, and by
controlling the deposition rate etc., the deposition film has a property similar to that of the riff's
chill). From the dense one to the porous one with a low specific gravity can be obtained relatively
freely. By anodizing the vapor-deposited film of aluminum, it is possible to form an oxide film on
the bedding on the substrate surface of the acoustic component molded in advance. However, it
is generally difficult to increase the thickness of the above-mentioned oxide film where the
Young's eyebrows increase in the dynamic zone due to the limitation of the applied voltage at the
time of anodic oxidation, and this is why It was extremely difficult to increase the speed of sound
and reduce the specific gravity of aluminum having a thickness of about the number of blades
IQam as used. In addition, such a high sound velocity material such as beryllium coated on the
surface of a molded product by vacuum evaporation or by means of a tensile method generally
has a disadvantage such as being expensive. The present invention is intended to remove the
above-mentioned drawbacks, and will be described below with reference to the respective
embodiments with reference to the drawings. FIG. 1 shows a longitudinal side tgt of a first
embodiment of an acoustic component which has been surface-treated according to the present
Reference numeral 1 denotes a base for an acoustic component which is molded in advance, such
as aluminum or a polymer material, on the surface of which a porous aluminum deposited film 2
having a specific gravity of a predetermined value or less is vacuum deposited. Here, for example,
when the temperature of the material to be deposited is 60 ° C. and the deposition rate is 20
arn / min, the specific gravity of the above-mentioned chironium vapor deposition I2 is 20 L. If
the deposition rate is further increased, the specific gravity is K The present invention can obtain
light ones of 20 or less. The present invention is to rapidly increase the speed of sound by
anodizing this aluminum vapor deposition FM2, and this increase in the speed of sound has a
thickness of IQQj! It has been confirmed that the degree of o does not depend on the thickness of
the vapor deposition film 2 which is an artifact. In addition, as a result of applying the same
treatment MA to the vapor deposition film having different specific gravities, the specific gravity
of the porous alvanium vapor deposition M2 decreases the effect of increasing the speed of
sound by anodic oxidation when the specific gravity exceeds 24. The sound speed at this time is
about 62 ooms / s. Therefore, Al has a specific gravity f2. By setting the ratio to A or less, the
large specific velocity of sound and small specific gravity is small, and the thickness of the vapordeposited film subjected to anodic oxidation can be increased to a conventional thickness. For
example, an aluminum vapor deposition film of vapor deposition rate 20 am / IElln, specific
gravity zo 1 sound velocity aooom / a, thickness AQsm is formed by vacuum vapor deposition on
the acoustic component substrate 1 previously formed, and then this vapor deposition film is 5s
Anodized in an aqueous solution of oxalic acid at an applied voltage XOV ′ ′ ′ F @ 3 hours,
followed by washing with water and vacuum drying gave a specific gravity of 1 tzo and a sound
velocity of 75 QQ m / s. Co-f'Lt-aluminum, titanium ('! The following table compares' i). Further,
the relationship between the specific gravity of the vapor-deposited film and the velocity of
sound according to this processing method is as shown in FIG. 2 (K, and the velocity of sound is
smaller than 7500 m / a as the deposition rate is, for example, 20 ruas mdn. However, as
described above, the specific gravity of the vapor-deposited film is increased as the deposition
rate of Kli decreases (so that it increases, but it hardly changes before and after the above
processing). As in the present invention, without forming a porous aluminum vapor deposition
film, anodized aluminum molded product having a thickness of AOjm simply by the same method
as described above has almost the same specific gravity per 1C 11 of foil and speed of sound. It
did not change. By the way, although it is used integrally with the chill mini lamb vapor
deposition film 2 唸 substrate 1 obtained by the above-mentioned processing method, it may be
peeled off from the substrate 1 and its' may be written and used. When the base material 1 is full
boron, it is possible to anodize as if peeling off the deposited film on the top of the base material
K11 is carried out, so that it is possible to shorten l5ts and to use only the deposited film. It is
extremely advantageous because it can compensate for the fragility of the case.
(6) EndPage: 2 FIG. 3 shows a longitudinal side view of a second embodiment of an acoustic
component which has been surface-treated according to the present invention. In the figure, the
same reference numerals as in FIG. 1 denote the same parts, and the explanation thereof will be
omitted. A dense aluminum vapor deposition M3 is formed, and then the porous vapor deposition
112 is formed to perform the above processing, thereby reinforcing the substrate 1 while
maintaining the adhesion. That is, the dense aluminum vapor deposition film 3 maintains the
adhesion to the substrate 1 being molded, and prevents the peeling of the porous vapor
deposition j [2 subjected to the oxidation treatment, and this vapor deposition @ X Since the
vapor deposition film 3 and the base material 1 peel easily if it is porous (it becomes fine as
much as possible and the whole layer is not oxidized). For this purpose, as a specific gravity of
the vapor deposition aS, one point is that the effect of the above-mentioned increase in the speed
of sound is small. According to the peeling test, when the specific gravity is 25 or more, the
adhesion between the vapor deposition films 2J3 is good It is. Further, by appropriately selecting
the entire thickness of the vapor deposition film 3, the vapor deposition aX is oxidized
throughout (7), so that the adhesion tube before the above treatment can be maintained between
the substrate 1 and the vapor deposition film 3. it can. As described above, according to the
acoustic component of the present invention and the method of manufacturing the same, the
anodized aluminum vapor-deposited film having a specific gravity of at least a predetermined
value or less is formed in a predetermined shape. Since the thickness of the aluminum deposition
film can be formed large, the Young's modulus can be made large, and an acoustic part having a
small specific gravity and high sound velocity can be obtained. Therefore, it is used as a
cantilever of a pickup or a diaphragm of a high sound speaker. Therefore, the reproduction
frequency band can be expanded and C transient characteristics can be improved (in particular,
the high range is extended), and conventionally (the label is cheap and rich in the quantity of
children) Since the specific gravity of the larger value and the overall thickness of the aluminum
deposited film having a small thickness (not at least anodized) are formed, the adhesion between
the two aluminum deposited films is good. In the case where an evaporated aluminum film
having a thickness that can not be anodized and is formed on a surface of a base material for an
acoustic component which has been molded into a predetermined shape (B1) in advance, The
above-mentioned base material can be reinforced while maintaining the adhesion tube with the
aluminum deposited film having a specific gravity larger than the above value, and the abovementioned base material for acoustic parts is aluminum, and this aluminum and the abovementioned predetermined value or less Since the aluminum deposited film having a specific
gravity of anodized is anodized, it is possible to exfoliate this deposited aluminum film
(anodization is possible, and hence the process can be simplified, and the brittleness in the case
of anodizing only the deposited film It has a number of htn features, such as
4. Brief description of the drawings The first rIIJ is a longitudinal sectional side view of the first
embodiment of the acoustic component according to the present invention, a diagram showing
the relationship between the specific gravity and the velocity of sound of the deposited film of
FIG. Is the second of the acoustic parts according to the present invention! It is a vertical side
view of an example. 1 ... base material for acoustic components, 2 ... porous aluminum deposited
film, 3 ... dense aluminum deposited film. Patent assignee Japan Victor Corporation Figure 1
Figure 2 Figure 2 r 3rd v! J□。 EndPage: 3
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