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JP2016187170

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DESCRIPTION JP2016187170
Abstract: To provide a speaker diaphragm that can provide a good balance between Young's
modulus and internal loss, and a speaker device provided with such a speaker diaphragm. A first
fiber entangled body constituting a diaphragm has a fiber in which a polyester-based resin
having a lactic acid unit represented by the following formula (1) is attached at least partially to
the main chain. A speaker diaphragm on which fiber entangled bodies are stacked. [Chemical
formula 1] -CO-CH (CH) -O- ... (1) 【Selection chart】 None
Speaker diaphragm and speaker device
[0001]
The present invention relates to a speaker diaphragm and a speaker device including the speaker
diaphragm.
[0002]
Loudspeaker diaphragm (hereinafter, also simply referred to as “diaphragm”.
Is generally produced by papermaking of natural fibers such as pulp, but in order to obtain a
good balance between Young's modulus and internal loss, a technique of using various materials
in combination is proposed.
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1
[0003]
For example, a technique of using polyethylene fibers for a diaphragm (Patent Document 1) or a
technique of using polyvinyl alcohol fibers for a diaphragm (Patent Document 2) is known.
However, in the former, although Young's modulus is improved, internal loss is reduced. In the
latter case, a sufficient improvement effect of Young's modulus can not be obtained.
[0004]
Japanese Patent Publication No. 57-005392 Japanese Patent Publication No. 53-96822
[0005]
The subject of the present invention is mentioned as an example to provide a speaker diaphragm
that can provide a good balance between Young's modulus and internal loss, and a speaker
device provided with such a speaker diaphragm. Be
[0006]
In order to solve the above problems and to achieve the object, in the speaker of the present
invention according to claim 1, the first fiber entangled body constituting the diaphragm at least
partially has the following formula (1) A second fiber entangled body having a fiber to which a
polyester-based resin having a lactic acid unit represented by the above is attached is laminated.
[0007]
[Chemical Formula 1] -CO-CH (CH3) -O- (1)
[0008]
It is a model sectional view of the speaker apparatus of one example of the present invention.
It is a graph which shows the Young's modulus improvement effect by a polylactic acid fiber.
It is a model fragmentary sectional view which shows the state in which the speaker diaphragm
of the other Example of this invention was integrated in the speaker apparatus.
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2
[0009]
Hereinafter, an embodiment of the present invention will be described.
A speaker diaphragm according to an embodiment of the present invention is a polyester system
having a lactic acid unit represented by the following formula (1) in the main chain at least
partially in a first fiber entangled body constituting the diaphragm. A second fiber entangled
body having fibers attached with resin is laminated.
With this configuration, a good balance between Young's modulus and internal loss can be
provided, and acoustic characteristics can be improved.
[0010]
[Chemical formula 2] -CO-CH (CH3) -O- (1)
[0011]
Further, the first fiber entangled body and the second fiber entangled body may be bonded by
the polyester resin.
With this configuration, a high Young's modulus can be obtained.
[0012]
Moreover, it can be set as the structure in which the fiber which belongs to both said 1st fiber
entangled body and said 2nd fiber entangled body exists. This configuration can further improve
the acoustic characteristics.
[0013]
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3
Moreover, the fiber which comprises said 1st fiber entangled body can be set as the structure
which is a natural fiber. This configuration makes it possible to obtain more appropriate acoustic
characteristics.
[0014]
The speaker apparatus of the present invention may include any one of the speaker diaphragms
and the voice coil.
[0015]
In addition, the speaker diaphragm, the edge portion, and the frame for supporting the speaker
diaphragm via the edge portion are provided, and the bending rigidity of the speaker diaphragm
is larger than the bending rigidity of the edge portion. be able to.
This configuration makes it possible to obtain a desired speaker device.
[0016]
A speaker device 1 according to an embodiment of the present invention will be described with
reference to FIG. FIG. 1 shows a model cross-sectional view of a speaker device provided with an
example of the speaker diaphragm of the present invention.
[0017]
The speaker device 1 includes a speaker diaphragm 8, a center cap 9, an edge 6, a frame 11, a
damper 7, a voice coil 5, a voice coil support 2, a yoke 12, a magnet 3 and a plate 4. Between the
yoke 12 and the magnetic gap 10 is formed.
[0018]
Among these, the yoke 12, the magnet 3, the plate 4 and the magnetic gap 10 constitute a
magnetic circuit.
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[0019]
A voice coil 5 formed by winding a wire of a predetermined length is disposed in the magnetic
gap 10.
An audio signal is input to the coil from the outside.
The voice coil 5 is supported by a cylindrical voice coil support 2. Also, the voice coil support
portion 2 is supported by the frame 11 via the damper 7 so that it can move back and forth in
the axial direction (vertical direction in the figure). The vicinity of the upper end portion of the
voice coil support portion 2 is connected to and supported by the opening edge of the speaker
diaphragm (an example of the speaker diaphragm of the present invention) 8. Further, a center
cap 9 is provided at the upper end portion of the voice coil support portion 2.
[0020]
The outer periphery of the speaker diaphragm 8 is supported by an edge portion 6 which is
interposed between the speaker diaphragm 8 and the frame 11 to connect them. The bending
rigidity of the speaker diaphragm 8 is higher than the bending rigidity of the edge portion 6.
Because of this, it is possible to obtain appropriate acoustic characteristics.
[0021]
Such a speaker diaphragm is formed of a fiber entangled body in which a plurality of fibers are
entangled. In this speaker diaphragm 8, the first fiber entangled body constituting the whole of
the speaker diaphragm 8 is partially shown in FIG. 1 (b) as a portion A of FIG. 1 (a) is enlarged.
And polyester resins having a lactic acid unit represented by the following formula (1) in the
main chain (hereinafter, also simply referred to as "polyester fibers"). A second fiber entangled
body 13 having fibers attached thereto is laminated, and these fiber entangled bodies are
adhered by this polyester resin
[0022]
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[Chemical formula 3] -CO-CH (CH3) -O- (1)
[0023]
In the case of the speaker diaphragm in which the second fiber entangled body 13 is partially
stacked on the first fiber entangled body as shown in FIG. 1, the speed of the sound radiated
from the stacked portion is Since the velocity of the sound emitted from the first layer portion is
faster, the directivity characteristic is improved.
[0024]
In the speaker device 1 of the embodiment shown in FIG. 1, the second fiber entangled body is
made of a synthetic fiber formed of a polyethylene-based resin to which a polyester-based resin
is attached.
[0025]
The first fiber entangled body is composed of pulp.
As described above, it is preferable to configure the first fiber entangled body from natural fibers,
because the internal loss of the speaker diaphragm can be improved.
However, if necessary, in addition to natural fibers, chemical fibers, synthetic fibers, inorganic
fibers, etc. can be used as long as they are fibers used for the speaker diaphragm.
The fibers of the second fiber entangled body can be selected as well.
[0026]
Also, from the viewpoint of reducing the porosity of the fiber entangled body, relatively short
fibers can be used. By appropriately adjusting the blending amount of relatively short fibers,
various characteristics such as the Young's modulus and internal loss of the speaker diaphragm
can be adjusted.
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[0027]
When using pulp, softwood pulp (N-BKP generally having a long fiber length). The fiber length is
generally 2 to 5 mm. ) But shorter fibers, such as hardwood pulp (fiber length generally 1-2 mm).
By using a small amount of) together, it is possible to reduce the occurrence of voids in the fiber
entangled body in which water easily infiltrates, and to improve the waterproofness of the
speaker diaphragm. As a preferable compounding mass ratio at this time, for example, when the
weight of the entire fiber entangled body is 100%, shorter fibers such as hardwood pulp are in
the range of 5% to 20%.
[0028]
In the present invention, by partially laminating the first fiber entangled body and the second
fiber entangled body, the fine characteristics of the speaker diaphragm, that is, the balance
between the internal loss and the Young's modulus can be easily adjusted. can do. However, if
necessary, the second fiber entangled body may be laminated on the entire first fiber entangled
body.
[0029]
In the present invention, colorants such as various dyes and pigments, inorganic powders such as
mica, inorganic powders such as mica, and various other additives may be added to the paper
making slurry used to form the fiber entangled body in addition to fibers. In addition, processing
such as dyeing may be performed after sheet-making as required.
[0030]
As a polyester-based resin which has a lactic acid unit represented by said Formula (1) in the
principal chain among the raw materials which comprise a 2nd fiber entangled body, polylactic
acid etc. are mentioned, for example. Among them, it is preferable to use a non-foamed resin, that
is, one that does not foam due to heating (including heating in the presence of water) or the like
because the Young's modulus improvement effect is surely obtained. Polylactic acid etc. are
mentioned as such a non-foaming thing.
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[0031]
The amount of polyester resin in the second fiber entangled body is preferably 5% by mass or
more and 50% by mass or less. If the amount is too large, the air resistance increases and the
internal loss is likely to decrease. If the amount is too small, it is difficult to obtain the Young's
modulus improvement effect. On the other hand, if it is too large, the Young's modulus is
improved. The internal loss becomes relatively small, and it becomes difficult to secure the
balance between the Young's modulus and the internal loss. A more preferable range is 10% by
mass or more and 30% by mass or less.
[0032]
As such a polyester resin, for example, a powdery resin may be used. However, when using a
fibrous resin, by performing papermaking, the fabric weight unevenness (the gradient of the
surface density of the entire speaker diaphragm is It is preferable because it can form a fiber
entangled body having a relatively small size and a good handling. In addition, although the
example using polylactic acid fiber as a raw material comprised from the polyester-type resin
which has a lactic acid unit represented by said Formula (1) in a principal chain below is
demonstrated, this invention is limited to this example I will not.
[0033]
The second fiber entangled body can be obtained by, for example, paper making using a paper
making slurry having pulp, polylactic acid fiber, and water.
[0034]
In the case of partially laminating the second fiber entangled body on the first fiber entangled
body, after forming the both, the necessary portion of the second fiber entangled body is cut out
if necessary, and the first fiber entangled body The speaker diaphragm of the present invention
can be obtained by laminating and dry pressing on the surface on the sound radiation side of the
body or the opposite surface thereof.
[0035]
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8
Alternatively, for example, the first fiber entangled body is first formed, and the second fiber
entangled body is partially masked on the first fiber entangled body, if necessary, to form the
speaker of the present invention. A diaphragm can be obtained.
At this time, after the sheet-forming of the first fiber entangled body, the fibers partially
projecting from the upper surface of the first fiber entangled body are taken into the second
fiber-entangled body at the time of sheet-forming of the second fiber entangled body The fibers
belong to both the first fiber entangled body and the second fiber entangled body, and the
laminated structure of the both becomes firm by this fiber, so that a high Young's modulus
improvement effect can be obtained.
[0036]
Although polylactic acid may sometimes be difficult to separate from the net, in the present
invention, adhesion is generated by forming the second fiber entangled body on the first fiber
entangled body in this manner. It can be prevented in advance.
Such adhesion is considered to be caused by partial hydrolysis of a polyester resin having a
polylactic acid unit in its main chain by heating in the presence of water.
[0037]
Similarly, in the dry pressing process, which is performed after the paper-making process, and is
applied while being heated, if the water remains, it may be difficult to peel off the second fiber
entangled body from the press die. . For this reason, it is preferable to carry out the drying step
using, for example, a hot air drier or the like before the dry pressing step in order to reduce the
water content in the fiber entangled body. By previously drying in this manner, the releasability
can be significantly improved, and the releasability can be resolved. In addition, since the first
fiber entangled body and the second fiber entangled body are adhered to each other by this dry
pressing step, a high Young's modulus improvement effect can be obtained.
[0038]
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When observed using a microscope etc. after the above-mentioned dry pressing process, the
polylactic acid fiber loses almost the shape as a fiber, and it will be in the state where polylactic
acid resin adhered to other material fibers. However, since the first fiber entangled body does not
lose its air permeability because it does not form a film, it has better acoustic characteristics than
a diaphragm made of a fiber entangled body to which a film is attached. It is possible to obtain
[0039]
As mentioned above, although this invention was mentioned and described a preferable
embodiment, the diaphragm for speakers of this invention and a speaker apparatus are not
limited to the structure of the said embodiment.
[0040]
Those skilled in the art can appropriately modify the speaker diaphragm and the speaker device
of the present invention in accordance with conventionally known findings.
Of course, as long as the speaker diaphragm and the speaker apparatus of the present invention
are provided even after such a modification, they are included in the scope of the present
invention.
[0041]
As a modification of the diaphragm 8 in the above-described embodiment, the speaker
diaphragm 18 shown in FIG. 3 which is a partial cross-sectional view of the model incorporated
in the speaker device may be adopted. In addition, the description about the point which is
common in the speaker diaphragm 8 mentioned above is omitted, and shall be described below.
The speaker diaphragm 18 shown in FIG. 3 has a connecting portion 18 a as an inner peripheral
portion connected to the voice coil support portion 2, a body portion 18 b, and a connecting
portion 20 as an outer peripheral portion connected to the edge 6. .
[0042]
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A curved portion is formed in the connecting portion 18 a from the inner peripheral portion of
the diaphragm 18 to the body portion. In addition, there is an inflection portion 18c at a position
corresponding to the outer peripheral portion in this curved portion. The inflection portion 18 c
is at a position where the cross-sectional shape of the diaphragm 9 changes from a curved shape
to a flat shape.
[0043]
Hereinafter, it will be specifically shown that the polyester resin improves the Young's modulus
without losing the internal loss. <Formation of a fiber entangled body> A paper making slurry
was prepared from high freeness pulp (specifically, 20 ° SR), made into paper, and then dried
with warm air to obtain a fiber interlaced.
[0044]
<Formation of Intermediate Laminate> The polylactic acid fiber is superimposed on the acoustic
emission side of the above fiber entangled body, and the polylactic acid content in the speaker
diaphragm finally obtained is 10% by mass, 20% by mass, 30% The intermediate laminate was
obtained by papermaking to have% or 40% by mass.
[0045]
<Drying step and dry pressing step> The above intermediate laminate was sufficiently dried with
a hot air dryer set at 80 ° C., and then dry pressed using a press adjusted to 170 ° C.
Thereafter, the unnecessary portion was removed to obtain a speaker diaphragm (inner diameter:
26 26 mm, outer diameter: 122 122 mm). Hereinafter, the polylactic acid content is 10% by
mass, the speaker diaphragm B, the 20% by mass speaker diaphragm C, the 30% by mass speaker
diaphragm D, and 40% by mass Are called speaker diaphragms E respectively.
[0046]
<Production of Speaker Diaphragm of Comparative Example> In the same manner as described
above, however, a speaker diaphragm A produced without laminating polylactic acid fibers was
produced.
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[0047]
<Surface thickness, density and air permeability of speaker diaphragms A to F> The surface
thickness, density and air permeability of these speaker diaphragms A to F are shown in Table 1.
The air resistance was measured in accordance with JIS P 8117: 2009.
[0048]
[0049]
It is understood from Table 1 that although the air resistance is high in the speaker diaphragm E
having a content of polylactic acid of 40% by mass, the air permeability is not lost.
[0050]
<Incorporation into speaker device and evaluation> For the speaker diaphragms A to E prepared
above, particularly for the speaker diaphragms B to E, the frequency in the low range is 100 Hz
in the middle region in the portion to which polylactic acid adheres The frequency was 1000 Hz
and the frequency in the high region was 5000 Hz, and the Young's modulus and internal loss at
each frequency were examined.
The results are shown in FIG.
Also, the internal loss at that time is shown in Table 2.
[0051]
[0052]
From these results, even in the speaker diaphragm E containing 40% by mass of polylactic acid,
the internal loss is at the same level as that of the speaker diaphragm without polylactic acid, and
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in the speaker diaphragm B to E having polylactic acid, It can be understood that a high Young's
modulus can be provided without reducing the internal loss.
[0053]
Reference Signs List 1 speaker device 2 voice coil support portion 3 magnet 4 plate 5 voice coil 6
edge 7 damper 8 and 18 diaphragm for speaker 9 center cap 10 magnetic gap 11 frame 12 yoke
13 second fiber interlacing body
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