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JP2006295245

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DESCRIPTION JP2006295245
PROBLEM TO BE SOLVED: To effectively increase internal loss and realize flattening of peak dip
of divided vibration band. SOLUTION: This is an acoustic diaphragm in which at least first to
third laminates 11, 12, 13 are laminated, and the first and third laminates 11, 13 are formed of a
polymer material A, The second laminate 12 is formed of a polymer material B having a
mechanical internal loss different from that of the polymer material A forming the first and third
laminates 11 and 13. [Selected figure] Figure 1
Acoustic diaphragm
[0001]
The present invention relates to an acoustic diaphragm used for a speaker or the like.
[0002]
Although the reproduction frequency of the conventional audio equipment was about 20 kHz, in
recent years, with the improvement of the performance of the audio equipment, reproduction up
to about 100 kHz has become possible.
Therefore, there is a demand for improving vibration damping, which is one of the mechanical
characteristics, of an acoustic diaphragm such as a speaker or a headphone.
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[0003]
Hereinafter, the physical properties required for the diaphragm material will be described by
taking the acoustic diaphragm of the speaker as an example. In the diaphragm material of the
acoustic diaphragm of the speaker, three factors that most affect the frequency characteristics of
the speaker are important. These three factors are (1) high elastic modulus, (2) high internal loss,
that is, high damping, and (3) low density.
[0004]
The relationship between this physical property and the reproduction frequency characteristic of
the speaker is shown in FIG. The elastic modulus affects the piston vibration zone, and the
internal loss affects the peak dip of the divided vibration zone B2. Further, the flattening is
required to have a large internal loss, that is, a large damping property.
[0005]
That is, by increasing the elastic modulus, the piston zone B1 is expanded in the X1 direction in
which the frequency increases. In addition, by increasing the internal loss, the resonance peak P
is reduced in the X2 direction in which the sound pressure decreases. Further, by increasing the
internal loss, that is, by increasing the damping property, the curve shape representing the
frequency characteristic becomes smooth and the planarization is improved.
[0006]
Also, the density affects the reproduced sound pressure level. That is, the sensitivity (level) is
improved in the X3 direction in which the sound pressure is increased by reducing the density
and, in other words, reducing the weight of the material.
[0007]
As apparent from FIG. 6, in order to reproduce high frequency, it is required to use a material
with high elastic modulus and to extend the piston band B1 to the high frequency band side as
much as possible.
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[0008]
In conventional 20 kHz regeneration, materials with large Young's modulus are used as much as
possible, piston zone B1 is expanded, and division vibration band B2 is set to 20 kHz or more.
The
[0009]
Also, in order to reduce the influence of the divided vibration, a damping material with a large
internal loss such as a dumping agent is applied to the surface of the diaphragm to flatten the
peak dip of the divided vibration.
[0010]
However, in recent 100 kHz regeneration, it is very difficult to perform 100 kHz regeneration
only in the piston zone B1, and a regeneration method using the divided vibration zone B2 is
required, and it is important to flatten the peak dip of the divided vibration zone B2. Has become
a problem.
[0011]
Conventionally, in order to flatten the peak dip, a method by dumping agent application has been
used, but this dumping agent application method is less effective and sufficient damping
property can not be obtained.
And the method of increasing the damping property which flattens the peak dip in a division |
segmentation vibration is calculated | required.
[0012]
Unexamined-Japanese-Patent No. 1-223898
[0013]
An object of the present invention is to provide an acoustic diaphragm in which the internal loss
is effectively increased and the peak dip of the divided vibration band is flattened.
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[0014]
In order to achieve this object, an acoustic diaphragm according to the present invention is an
acoustic diaphragm in which at least first to third laminates are laminated, and the first and third
laminates are made of a polymer material. The second laminate is formed of a polymer material
different in mechanical internal loss from the polymer material forming the first and third
laminates.
[0015]
The acoustic diaphragm according to the present invention is an acoustic diaphragm in which a
laminate of three or more layers is laminated, and each laminate is a first or second polymer
having different mechanical internal losses. A laminate formed of a material and formed of the
first polymer material and a laminate formed of the second polymer material are alternately
arranged.
[0016]
The acoustic diaphragm according to the present invention effectively increases the internal loss,
realizes the improvement of the vibration damping property, and realizes the flattening of the
peak dip of the divided area.
[0017]
Hereinafter, an acoustic diaphragm to which the present invention is applied will be described
with reference to the drawings.
[0018]
In the acoustic diaphragm 1 to which the present invention is applied, as shown in FIG. 1A, the
first laminate 11, the second laminate 12, and the third laminate 13 are in the thickness
direction. It is stacked in order.
[0019]
The first and third laminates 11 and 13 are made of the polymer material A.
In addition, although the 1st and 3rd laminated bodies 11 and 13 set it as the same material
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here, they may be different materials.
[0020]
Specific examples of the polymer material A include polyester (PET), polycarbonate (PC),
polyethylene naphthalate (PEN), polyetheretherketone (PEEK), polypropylene (PP),
polymethylpentene (TPX), and the like. Used.
These polymeric materials may be transparent or opaque with a filler such as carbon.
[0021]
In addition, as the polymer material A, in the case of a single polymer, colored materials such as
polyimide (PI), polyetherimide (PEI), liquid crystal polymer (LCP) and the like may be used.
[0022]
The second laminate 12 is formed between the first and third laminates 11 and 13 and is made
of a dumping agent B which is a polymeric material having high damping performance.
That is, the second laminate 12 is made of a material having a large mechanical internal loss with
respect to the polymer material A constituting the first and third laminates 11 and 13.
[0023]
As this dump agent B, a polyester-based adhesive for hot melt type lamination mainly composed
of a polyester resin (Vyron-300 (made by Toyobo Co., Ltd.)), a hot melt film adhesive (Admer film
(olefin resin) (Tosoh cell) A hot melt film) or the like is used.
[0024]
In the acoustic diaphragm 1 configured as described above, the first to third laminates 11, 12, 13
are stacked in the thickness direction, and the first and third laminates 11, 13 are made of the
polymer material A. The second laminate 12 is formed by dumping agent B, which is a polymer
material having a large mechanical internal loss with respect to polymer material A, so that the
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internal loss can be effectively achieved as a whole of the three-layer structure. It is realized to
increase the damping property and to realize the flattening of the peak dip of the divided area.
[0025]
In the acoustic diaphragm 1 described above, the first to third laminates 11, 12, and 13 are
stacked to form a three-layer structure, but the present invention is not limited to this, and a
multilayer of three or more layers is provided. The laminates of the above were laminated, and
the adjacent laminates were each formed into a multilayer structure formed by laminating film
materials such as polymeric material A and dumping agent B having different physical properties,
ie, different mechanical internal losses. It may be an acoustic diaphragm made of a multilayer
film.
That is, in the above description, the material is a three-layer structure formed in the order of A /
B / A, but even in a four-layer structure such as that laminated in the order of A / B / A / B It may
be a five-layer structure such as laminated in the order of A / B / A / B / A, or may be a
multilayer structure.
If the number of laminates is increased to form a multilayer structure, that is, three or more
multilayer laminates are laminated, and each of the laminates is a first polymeric material A or a
second one having a different mechanical internal loss. A laminate formed of dump material B,
which is a polymer material, and formed of a first polymer material A, and a laminate formed of a
second polymer material B are alternately arranged. Thus, the internal loss can be increased by
the effect of shear deformation, which will be described later, by an amount corresponding to the
increase in the number of the laminates, and the vibration damping property can be enhanced.
[0026]
Next, the vibration control mechanism of the acoustic diaphragm 1 to which the present
invention is applied will be described in comparison with the conventional vibration control
mechanism of the acoustic diaphragm by examining the respective bending vibrations.
Below, the polymer material which respectively comprises the acoustic diaphragm 1 to which the
present invention is applied and the acoustic diaphragm 100 as a comparative example for
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comparison with the present invention is a polymer material different in mechanical internal loss
from A and A. Considering a certain dumping agent as B, referring to FIGS. 1 and 2, bending
vibration is examined to compare and explain each vibration control mechanism.
[0027]
In general, bending vibration is a stretching deformation of a material, and the magnitude of
damping properties is known to change depending on the internal loss of the material and the
structure that constitutes the material.
That is, the damping property is enhanced if it is made of only the material having a large
internal loss.
On the other hand, as in the case of the acoustic diaphragm 1 of the present invention, in the
case where the laminate is formed by laminating the different materials, the polymer material A
and the dump agent B, the laminated structure Affects vibratility.
[0028]
Next, an acoustic diaphragm 100 according to a comparative example to be compared with the
acoustic diaphragm 1 to which the present invention having the three-layer structure shown in
FIG. 1A described above is applied will be described using FIG. .
[0029]
In the acoustic diaphragm 100 of the comparative example, as shown in FIG. 2A, a first laminate
101 made of a polymer material A and a second laminate 102 made of a dumping agent B are
laminated in the thickness direction. It has a two-layer structure.
That is, the acoustic diaphragm 100 is configured by applying the dumping agent B to the first
laminate 101.
[0030]
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The acoustic diaphragm 100 has a two-layer structure shown in FIG. 2A, and the damping
mechanism having such a two-layer structure is performed by energy absorption by expansion
and contraction of the damping agent B having a large internal loss.
That is, at the time of vibration, as shown in FIG. 2 (b), energy absorption is performed by the
dumping agent B being deformed in the direction d2.
[0031]
On the other hand, the acoustic diaphragm 1 to which the present invention is applied has a
three-layer structure shown in FIG. 1 (a), and the damping mechanism of such a three-layer
structure is formed of a polymer material A along with bending. In the dump agent B formed
between the first and third laminates 11 and 13, ie, the second laminate 12, deformation in the
shear direction, ie, shear deformation occurs.
And damping is performed by energy absorption by the shear deformation of dumping agent B of
the 2nd layered product 12 at this time.
That is, at the time of vibration, as shown in FIG. 1B, energy absorption is performed by the
dumping agent B being sheared and deformed in the d11 and d12 directions.
[0032]
That is, the form of deformation that occurs in each dumping agent B of the acoustic diaphragm
100 of the comparative example and the acoustic diaphragm 1 to which the present invention is
applied is that the dumping agent B, which is the second laminate 102 of the acoustic diaphragm
100, expands and contracts. The dumping agent B which is the second laminated body 12 of the
acoustic diaphragm 1 to which the present invention is applied is sheared and deformed, and the
energy absorption mechanisms of the two are largely different.
The internal loss due to shear deformation in the shear direction due to the dump agent B of the
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three-layer acoustic diaphragm 1 is larger than the internal loss due to expansion and
contraction due to the dump agent B of the two-layer acoustic diaphragm 100.
[0033]
Therefore, in the acoustic diaphragm 100 of the comparative example, the amount of
deformation is proportional to the thickness of the dumping agent B because energy is absorbed
by expansion and contraction.
Therefore, in order to obtain a large damping performance, it is necessary to make the thickness
of the second laminate 102 (dumping agent B) sufficiently large.
[0034]
On the other hand, in the multilayer structure such as the acoustic diaphragm 1 to which the
present invention is applied, shear deformation occurs in the second laminate 12 even with
minute deformation such as vibration, and the second laminate 12 Even if the thickness of (Damp
agent B) is small, large shear deformation occurs. That is, the energy absorption is large and the
damping performance is large. Such a configuration is an effective damping method for minute
vibrations such as acoustic diaphragms.
[0035]
As described above, the acoustic diaphragm 1 uses a method of effectively increasing the
damping property of the acoustic diaphragm by applying the property of the damping agent B as
a visco-elastic body, and the diaphragm Compared with the method of applying the dumping
agent as in the comparative example, by making the polymer material A constituting the film and
the polymer material B to be the dumping agent into a laminated composite of A / B / A threelayer structure or more. Effectively increase the damping property and achieve the flattening of
the peak dip of the divided area.
[0036]
That is, in the acoustic diaphragm 1 to which the present invention is applied, a laminate of three
or more layers of polymer materials is laminated in the thickness direction, and the dynamic
internal losses of the polymer materials forming the adjacent laminates are different. As a result,
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the internal loss is effectively increased, the vibration damping property is enhanced, and the
peak dip of the divided area is flattened.
[0037]
In addition, since the acoustic diaphragm 1 to which the present invention is applied can exhibit
damping performance in a state where the thickness is reduced compared to the configuration in
which the conventional dumping agent is applied, thinning and weight reduction can be realized.
.
Furthermore, the acoustic diaphragm 1 to which the present invention is applied realizes 100
kHz reproduction by realizing flattening of the peak dip of the divided region.
[0038]
In the above-mentioned acoustic diaphragm 1, although the acoustic diaphragm was constituted
using only a multilayer film, it is not restricted to this, For example, it is one end side of the
thickness direction of a layered product which constitutes an acoustic diaphragm, Other
materials may be joined and configured.
[0039]
That is, even if it forms so that diaphragm materials, such as aluminum foil, may be bonded
together to either of the 1st or 3rd laminated bodies 11 and 13 of the acoustic diaphragm 1
shown to Fig.1 (a), for example Good.
Here, the other material is not limited to aluminum, and another diaphragm material may be
used.
Further, even in the case of the acoustic diaphragm in which the multilayer laminate of three or
more layers is laminated, even if another material is bonded to one end side in the thickness
direction of the multilayer laminate. Good.
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[0040]
As in the case of the above-described acoustic diaphragm 1, in the acoustic diaphragm made of a
multilayer film to which other materials are joined, laminates of three or more layers of polymer
materials are laminated in the thickness direction, and the adjacent laminates have physical
properties. By being formed of materials different in (dynamic internal loss), it is possible to
effectively increase the internal loss, to improve the damping performance, and to realize the
flattening of the peak dip of the divided region. That is, the multilayer film functions as a
vibration damping material of a diaphragm such as aluminum. Such an acoustic diaphragm can
obtain flat characteristics without peak dip, as compared to, for example, an acoustic diaphragm
made of aluminum alone.
[0041]
In addition, the acoustic diaphragm 1 to which the present invention is applied has a multilayer
structure of three or more layers, thereby exhibiting an optical interference phenomenon, the
reflected light exhibits a metallic luster color, and exhibits the decorative function of the acoustic
diaphragm. can do. That is, in the acoustic diaphragm to which the present invention is applied,
the polymer material A and the dump agent B, which constitute a laminate having a multilayer
structure of three or more layers, have different refractive indexes, and have different
thicknesses. Can cause different light interference phenomena. This is caused by the occurrence
of an optical path difference depending on the wavelength, the incident angle changing
according to the viewing angle, and the phases of specific wavelengths being matched.
[0042]
More specific first to fifth embodiments of the acoustic diaphragm to which the present invention
is applied will be described below.
[0043]
Example 1 A biaxially stretched polyester film (hereinafter referred to as "PET film") as a
polymeric material A.
) And a polyester-based adhesive (hereinafter referred to as “LA”) for laminating using a
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polyester-based resin as the polymer material B to be a dump agent. The physical properties of
the polymer materials A and B are measured using the above values, and the measured values are
used to simulate by the viscoelastic theory, and Comparative Example 1 to which the
conventional method is applied and Example 1 to which the present invention is applied. We
made a comparison with.
[0044]
In the comparative simulation, as Example 1 to which the present invention is applied, it has a
three-layer structure stacked in the order of A / B / A, that is, the same configuration as the
configuration shown in FIG. A PET film is used as the polymer material A constituting the
laminates 11 and 13 of 3 and formed to a thickness of 3 microns, and LA is used as the dump
agent B constituting the second laminate 12. A composite (three-layer structure) constituting an
acoustic diaphragm was formed with a thickness of 1 micron. And the internal loss of the
complex was determined by simulation.
[0045]
In addition, Comparative Example 1 for comparison with Example 1 configured as described
above was configured as follows. The acoustic diaphragm of Comparative Example 1 has the
same configuration as the configuration shown in FIG. 2A described above, and uses a PET film
as the polymer material A constituting the first laminate 101, and a second laminate. A
composite (two-layer structure) constituting an acoustic diaphragm was formed using LA as the
dumping agent B constituting 102. The acoustic diaphragm of Comparative Example 1 is
compared by calculating the thickness of the dumping agent B, which is required to obtain an
internal loss of the same value as the internal loss of the acoustic diaphragm of Example 1, by
simulation. The The effectiveness of Example 1 was compared with Comparative Example 1 by
performing this simulation.
[0046]
In this simulation, following Formula (1) was used as a simulation formula of Example 1 (3 layer
structure) to which this invention is applied. However, in the formula (1), :: internal loss of threelayer structure, η2 ′: internal loss of LA, a: ratio of elastic modulus of LA to elastic modulus of
PET (elastic modulus of LA / elastic modulus of PET), ξ: Ratio of LA thickness to PET thickness
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(LA thickness / PET thickness) In addition, b shall satisfy following Formula (2).
[0047]
[0048]
[0049]
In Comparative Example 1 having a two-layer structure, a ratio of the thickness of LA to the
thickness of PET necessary to satisfy the internal loss of the three-layer structure determined by
the above-mentioned equation (1) (Thickness of LA / Thickness of PET) is obtained by the
following equation.
However, in equation (3), A: ratio of internal loss of the three-layer structure to internal loss of
LA (internal loss of three-layer structure / internal loss of LA (η / η2 ′))
[0050]
[0051]
The equation (3) is an equation for obtaining the thickness ratio of each layer for obtaining the
same loss coefficient as the three-layer structure in the conventional two-layer structure, and has
a three-layer structure shown by the above-mentioned equations (1) and (2). It can not be
calculated if the internal loss of is not obtained, and the thickness ratio of the two-layer structure
can be calculated by using this value.
[0052]
The elastic modulus and internal loss of PET and LA used in the above-described Example 1 and
Comparative Example 1 are those shown in "Table 1".
[0053]
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[0054]
When the above formulas (1) to (3) are calculated according to the physical property values
shown in “Table 1”, in Example 1 to which the present invention is applied, A of the threelayer structure of A / B / A, ie PET film The total thickness of is 6 microns.
Then, in Comparative Example 1, when the thickness of the PET film is 6 microns, in order to
obtain the same internal loss as in Example 1, the above-mentioned formulas (1) to (5) are
obtained according to the physical property values shown in "Table 1". Calculation of (3) requires
that the thickness of LA of dumping agent B be 3 microns.
On the other hand, the thickness of LA of dumping agent B of Example 1 is 1 micron as described
above.
[0055]
As described above, in the acoustic diaphragm of Example 1 to which the present invention is
applied, the same internal loss can be obtained even when the thickness of LA used as the
dumping agent B is 1⁄3 of the conventional one shown in Comparative Example 1 It is possible to
reduce the weight required for the acoustic diaphragm.
[0056]
Example 2 In Example 2, a three-layer structure in which A / B / A is stacked in order is used,
that is, the same structure as shown in FIG. 1A, and the first and third laminates 11, 13 Is formed
with a thickness of 25 microns using a PET film as the polymer material A forming the film, and
is formed with a thickness of 10 microns using LA as the dumping agent B forming the second
laminate 12 Thus, a composite (three-layer structure) constituting an acoustic diaphragm was
formed.
The internal loss of the composite of Example 2 thus formed was measured by the vibration lead
method.
[0057]
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Moreover, it is set as the 2 layer structure of A / B as Comparative Example 2, ie, it is set as the
same structure as shown to Fig.2 (a), and is Example 2 as polymer material A which comprises
the 1st laminated body 101. In the same manner as in the polymer material A of the above, using
the PET film, it was formed with the same thickness as the total of Example 2, that is, 50 microns.
In addition, as the dump agent B constituting the second laminate 102, similarly to the dump
agent B of Example 2, using LA, based on the simulation result of Example 1, 3 of the thickness
of Example 2 An application of 30 microns was applied to form a composite (two-layer structure)
constituting an acoustic diaphragm.
[0058]
The composites of Example 2 and Comparative Example 2 were measured for internal loss by the
vibration lead method. The results are shown in Table 2.
[0059]
[0060]
As shown in Table 2, the thickness of LA used as the dumping agent B necessary to obtain the
same internal loss in the composite of the polymer material A and the dumping agent B of the
same thickness is equivalent to the present invention. In Example 2 to which it applied, it has
confirmed that it was good about 1/3 of Comparative Example 2 which is a conventional
structure.
Moreover, the result of the simulation of Example 1 can be demonstrated, and it has been
confirmed that this simulation is effective when used for an acoustic diaphragm.
[0061]
Example 3 In Example 3, the composite of the three-layer structure constructed in Example 2 is
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used, and a 25-mm-aperture balanced dome shape Tweeter (hereinafter referred to as “Tw”).
) Were manufactured, and their reproduction frequency characteristics were measured.
[0062]
Further, for comparison with Example 3, using the composite of the two-layer structure
configured in Comparative Example 2 as Comparative Example 3-1, the balance dome shape Tw
having a diameter of 25 mm is obtained in the same manner as Example 3. I made it.
Furthermore, as Comparative Example 3-2, using a single PET film of 50 microns, in the same
manner as Example 3, a balance dome-shaped Tw with a diameter of 25 mm was manufactured.
[0063]
The results of measurement of the reproduction frequency characteristics of Tw using the
composite of Example 3 and Comparative Examples 3-1 and 3-2 are shown in FIG.
In FIG. 3, L3 indicates the reproduction frequency characteristic of Example 3, L31 indicates the
reproduction frequency characteristic of Comparative Example 3-1, and L32 indicates the
reproduction of Comparative Example 3-2. It shows frequency characteristics.
[0064]
As is apparent from FIG. 3, Tw using the acoustic diaphragm of Example 3 to which the present
invention is applied and the acoustic diaphragm of Comparative Example 3-1 having the
conventional configuration has a peak dip at a frequency of 20 kHz or more It is less. On the
other hand, Tw of Comparative Example 3-2 constituted only with a PET film has a large peak
dip. Moreover, the reproduction sound pressure (SPL) is the same as Example 3 to which this
invention is applied, and Comparative Example 3-2 of PET single-piece | unit.
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[0065]
The acoustic diaphragm according to the third embodiment to which the present invention is
applied is capable of obtaining the characteristic that the peak dip in the high frequency band is
small and the sound pressure level is high, and this characteristic consists of less LA compared
with the conventional method. It is attributed to the effect of obtaining a large internal loss by
the thickness of the dump agent and the weight reduction of the diaphragm due to the small
thickness of the dump agent. It has been confirmed that the present invention is a technology
that effectively acts on the acoustic diaphragm.
[0066]
Example 4 In Example 4, a 15-layer structure in which A / B / A / B... B / A are laminated in order
is used, that is, the first to fifteenth laminated bodies are laminated, and , 5th, 7th, 9th, 11th,
13th and 15th laminates are formed with a thickness of 3 microns using a PET film as the
polymer material A, and 4, a composite having a 15-layer structure constituting an acoustic
diaphragm with a thickness of 1 micron, using LA as the dumping agent B constituting the
laminates of the fourth, sixth, eighth, tenth, twelfth and fourteenth And the complex was used to
produce Tw similar to that of Example 3, and the reproduction frequency characteristics were
measured.
[0067]
The result of measuring the reproduction frequency characteristics of Tw using the composite of
the 15-layer laminated structure of Example 4 is shown in FIG.
In FIG. 4, L4 indicates the reproduction frequency characteristic of the fourth embodiment. As in
the third embodiment shown by the curve L3 in FIG. 3, the internal loss can be effectively
increased and the vibration damping property can be enhanced if the multi-layered structure has
three or more layers with less peak dip of 20 KHz or more. It is possible to realize the flattening
of the peak dip of the divided region and the usefulness of the present invention becomes clear.
[0068]
In addition, it was also confirmed that the composite film produced in Example 4 exhibited a light
interference phenomenon, and the reflected light exhibited a metallic luster color and could be
used for decoration of a diaphragm.
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[0069]
Example 5 Example 5 is an example for confirming the composite effect of the above-mentioned
multilayer film and other materials.
That is, in Examples 3 and 4, the effectiveness of the acoustic diaphragm was examined using
only the A / B multilayer film. In Example 5, an aluminum foil as another material is bonded to
one end side in the thickness direction of the first to fifth laminates having a five-layer structure
laminated in the order of A / B / A / B / A. There is. A PET film is used as the polymer material A
that constitutes the first, third and fifth laminates, and it is formed with a thickness of 3 microns,
and as a dump agent B that constitutes the second and fourth laminates Using LA, form a 1
micron thick and form a 35 micron thick aluminum foil on either the first or fifth laminate to
form a composite acoustic diaphragm, as described above. Tw similar to 3 was manufactured,
and the reproduction frequency characteristic was measured.
[0070]
Further, as Comparative Example 5 to be compared with Example 5, a Tw similar to that of
Example 5 was manufactured using an acoustic diaphragm formed of aluminum alone, and the
reproduction frequency characteristic was measured.
[0071]
The measurement result of the reproduction frequency characteristics of the composite obtained
by joining the aluminum foils of Example 5 and Comparative Example 5 and Tw using an
aluminum diaphragm is shown in FIG.
In FIG. 5, L5 represents the reproduction frequency characteristic of Example 5, and L51
represents the reproduction frequency characteristic of Comparative Example 5.
[0072]
The characteristic of the acoustic diaphragm of Comparative Example 5 composed of aluminum
alone has a large peak dip, while the acoustic diaphragm of Example 5 to which the present
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invention is applied exhibits a flat characteristic without peak dip, The effect appears to be large.
[0073]
In addition, the method of producing a multilayer laminate is not limited to only this
embodiment, and a conventional method of producing a multilayer film with good efficiency and
equipment may be used, and the materials of the polymer material A and the dump agent B The
type and thickness of the component are not limited to the above-described embodiment.
[0074]
Further, in the mechanical internal loss of the material, in the above-mentioned Examples 1 to 5,
the constitution was laminated in the order of A / B / A using LA as dumping agent B having a
larger internal loss than the PET film of A. Although explained, in the case of a multi-layered
structure of four or more layers, it may be laminated in the order of B / A / B / A.
[0075]
Further, in the fifth embodiment, although the explanation was made using an aluminum
diaphragm having a small internal loss which is most likely to exert the effects of the present
invention, as “other materials” joined to one end side in the thickness direction of the laminate,
The material is not limited to aluminum, and may be a common material used for other acoustic
diaphragms.
[0076]
The acoustic diaphragm to which the present invention is applied can effectively increase the
internal loss of the acoustic diaphragm and flatten the peak dip of the divided vibration band by
having a laminate of three or more layers.
[0077]
Therefore, the acoustic diaphragm to which the present invention is applied is particularly
effective when used for a speaker that reproduces a high frequency band of 20 kHz or more.
In addition, the acoustic diaphragm to which the present invention is applied can improve the
damping property and obtain metallic luster by the laminate of the polymer material constituting
the acoustic diaphragm, and can enhance the decorative property.
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[0078]
The acoustic diaphragm to which this invention is applied is shown, (a) is sectional drawing at
the time of normal times, (b) is sectional drawing which shows the damping by shear
deformation at the time of a vibration.
The conventional acoustic diaphragm is shown, (a) is sectional drawing at the time of normal
times, (b) is sectional drawing which shows the damping by expansion-contraction deformation |
transformation of the dumping agent at the time of a vibration.
It is a characteristic view showing the relation between the reproduction frequency characteristic
of the acoustic diaphragm concerning Example 3, and the reproduction frequency characteristic
of the acoustic diaphragm of comparative example 3-1 and 3-2 compared with the present
invention.
FIG. 16 is a characteristic diagram showing reproduction frequency characteristics of the
acoustic diaphragm according to Example 4.
It is a characteristic view showing the relation between the reproduction frequency characteristic
of the acoustic diaphragm concerning Example 5, and the reproduction frequency characteristic
of the acoustic diaphragm of comparative example 5 which compares with the present invention.
It is a figure which shows the relationship of the reproduction | regeneration frequency
characteristic of the conventional acoustic diaphragm.
Explanation of sign
[0079]
DESCRIPTION OF SYMBOLS 1 acoustic diaphragm, 11 1st laminated body, 12 2nd laminated
body, 13 3rd laminated body
10-05-2019
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