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JPWO2014132393

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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 JPWO2014132393
Abstract: An inexpensive speaker diaphragm capable of suppressing delamination is provided.
The speaker diaphragm (4) is formed of a sheet-formed body made of the materials (4a1, 4b1),
and includes a first diaphragm layer (4a) and a second diaphragm layer (4b) laminated to each
other. The first diaphragm layer (4a) and the second diaphragm layer (4b) are integrated at their
boundary portion.
Speaker diaphragm
[0001]
The present invention relates to a speaker diaphragm.
[0002]
The speaker diaphragm has a multilayer structure configured by superposing a plurality of
diaphragm layers having different physical properties in order to improve the sound quality (see,
for example, Patent Document 1).
The speaker diaphragm of such a multilayer structure is made of different materials separately,
and then, for example, the semi-dried inner layer cone paper which is made between the semidried inner surface cone paper and the outer surface cone paper which has been made. The
laminate is sandwiched and heated for heating and pressure, or it is manufactured by adopting
an adhesive fiber as a material constituting one layer and bonding it to the other layer.
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1
[0003]
Unexamined-Japanese-Patent No. 3-210897
[0004]
However, since the speaker diaphragm manufactured by the method described above is
dewatered after layering in advance and then stacked, the bond between the respective cone
papers (each layer) becomes relatively weak, and problems such as delamination occur. There is
a possibility that it may occur as an example of the problem.
Moreover, the rise in manufacturing cost is mentioned as an example of a subject by employ |
adopting adhesive fiber.
[0005]
Then, this invention makes it a subject to provide the cheap diaphragm for speakers which can
suppress delamination.
[0006]
In order to solve the above-mentioned subject, the invention described in Claim 1 is provided
with a plurality of laminated sheet-formed bodies, and is a speaker diaphragm characterized in
that two adjacent sheet-formed bodies are integrated. is there.
[0007]
It is a figure for demonstrating the diaphragm for speakers which concerns on one Example of
this invention, Comprising: (a) is a half section for demonstrating the speaker apparatus which
employ | adopted the diaphragm for speakers concerning one Example of this invention It is a
figure, (b) is a sectional view for explaining the diaphragm for speakers shown to (a), (c) is an
enlarged section of the diaphragm for speakers shown to (b) .
It is a figure for demonstrating the manufacturing apparatus of the diaphragm for speakers, and
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is a figure for demonstrating an example of the 1st diaphragm layer forming process of the
manufacturing method of the diaphragm for speakers.
It is a figure for demonstrating an example of the liquid layer injection | pouring process of the
manufacturing method of the diaphragm for speakers. It is a figure for demonstrating an
example of the 2nd diaphragm layer formation process of the manufacturing method of the
diaphragm for speakers. It is a figure for demonstrating an example of a mode that it deposits
after injection | pouring of the suspension liquid which included the material of the 2nd
diaphragm layer. It is a figure for demonstrating an example of the formation process of the
manufacturing method of the diaphragm for speakers. It is a figure for demonstrating an
example of the other shaping | molding process of the manufacturing method of the diaphragm
for speakers. It is a figure for demonstrating the structure of the modification of the diaphragm
for speakers which concerns on one Example of this invention, Comprising: (a) is sectional
drawing for demonstrating the diaphragm for speakers, (b) is It is a cross-sectional enlarged view
of the diaphragm for speakers shown to (a). It is a figure for demonstrating the structure of the
modification of the manufacturing apparatus of the diaphragm for speakers shown in FIG. It is a
figure for demonstrating the structure of the other modification of the manufacturing apparatus
of the diaphragm for speakers shown in FIG.
[0008]
Hereinafter, a speaker diaphragm according to an embodiment of the present invention will be
described.
[0009]
A speaker diaphragm according to an embodiment of the present invention includes a plurality of
stacked sheet-formed bodies, and two adjacent sheet-formed bodies are integrated.
Moreover, the boundary part of two adjacent sheet-formed products may be integrated. Since it
did in this way, without using an adhesive fiber etc., the integrity between each paper-making
body can be improved and it can suppress interlayer isolation cheaply. In addition, it is possible
to improve the bondability between the respective sheet-formed bodies. This integrity includes
cohesion. Specific examples having integrity include having a predetermined adhesive strength, a
predetermined adhesive strength, a predetermined peel strength, a predetermined bonding
strength, and a predetermined binding strength.
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[0010]
Further, the papermaking body may be made of a material, and an entangled portion in which
the materials of the two papermaking bodies are entangled may be formed at the boundary
between the two papermaking bodies. In this way, it is possible to integrate by interlacing
portions at the boundary portion between two sheet-formed bodies adjacent to each other, to
enhance the integrity between the respective sheet-formed bodies, and to suppress separation of
the sheet-formed bodies. Moreover, the integrity between each paper-made body can be
improved.
[0011]
Further, the thickness of the entangled portion may be smaller than the thickness of one of the
two sheet-formed bodies. By doing so, the integrity between the sheet-formed bodies can be
enhanced, and separation between the sheet-formed bodies can be suppressed. In addition, while
maintaining the predetermined thickness of each sheet-formed body, it is possible to enhance the
integrity between the sheet-formed bodies and to suppress the separation between the sheetformed bodies. Moreover, since the predetermined thickness of each paper-made body can be
maintained, the acoustic characteristics of the speaker device using the speaker diaphragm
according to the present invention can be improved.
[0012]
In addition, it may be possible to have peel strength between two adjacent sheet-formed
products. By doing so, the integrity between the layers can be enhanced and separation between
the sheet-formed bodies can be suppressed.
[0013]
Further, the density of one of the two sheet-formed bodies may be made larger than the density
of the other sheet-formed body. Further, the Young's modulus of one of the two sheet-formed
bodies may be made larger than the Young's modulus of the other sheet-formed body. With such
a configuration, the Young's modulus of the speaker diaphragm can be increased, and the
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acoustic characteristics of the speaker device using the speaker diaphragm can be improved.
[0014]
In addition, one of the two sheet-formed bodies adjacent to each other may be a surface layer of
the plurality of sheet-formed bodies, and the one sheet-formed body may have a uniform
thickness throughout. By doing this, it is possible to improve the acoustic characteristic of the
speaker device using the speaker diaphragm.
[0015]
In addition, the other sheet-formed body adjacent to one of the two adjacent sheet-formed bodies
may have a uniform thickness throughout. By doing this, it is possible to improve the acoustic
characteristic of the speaker device using the speaker diaphragm.
[0016]
Hereinafter, a speaker diaphragm according to an embodiment of the present invention, and an
apparatus and a method for manufacturing the speaker diaphragm will be described with
reference to the drawings.
[0017]
First, the configuration of the speaker diaphragm will be described, and then the manufacturing
apparatus and method of the speaker manufacturing plate will be described.
[0018]
(Embodiment of Speaker Diaphragm) Hereinafter, a speaker diaphragm will be described with
reference to FIG.
[0019]
FIG. 1 is a view for explaining a speaker diaphragm according to an embodiment of the present
invention.
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FIG. 1 (a) is a half sectional view for explaining a speaker apparatus adopting a speaker
diaphragm according to an embodiment of the present invention.
FIG. 1 (b) is a cross-sectional view for explaining the speaker diaphragm shown in FIG. 1 (a).
FIG. 1 (c) is an enlarged sectional view of the speaker diaphragm shown in FIG. 1 (b).
[0020]
A speaker device 10 employing a speaker diaphragm according to an embodiment of the present
invention includes a magnetic circuit 1 formed of a magnet 1A, a plate 1B, and a yoke 1C, as
shown in FIG. The voice coil 3 wound around the voice coil support 2 and the speaker diaphragm
4 whose center is fixed to the voice coil support 2 are disposed in the magnetic gap of the above.
The outer peripheral edge of the speaker diaphragm 4 is fixed to the frame 7 via the edge 5 and
the gasket 6. The voice coil support 2 is fixed to the frame 7 by a damper 8, and the opening of
the voice coil support 2 is covered by a center cap 9.
[0021]
The speaker diaphragm 4 has a multilayer structure in which a plurality of diaphragm layers are
stacked. As shown in FIGS. 1B and 1C, the speaker diaphragm 4 has a first diaphragm layer 4a
and a second diaphragm layer 4b formed of a paper-made body formed by paper-making. The
speaker diaphragm 4 is an example of a laminated body, and an example of a multilayer papermade body. Each of the first diaphragm layer 4a and the second diaphragm layer 4b corresponds
to an example of a sheet-formed body. Here, although the speaker diaphragm 4 having a twolayer structure is described, the present invention is not limited to this embodiment, and the
speaker diaphragm 4 may have a multilayer structure of three or more layers. In addition, the
configuration of the speaker diaphragm to be described later may be diverted to the speaker
diaphragm on which the speaker edge or the speaker diaphragm and the speaker edge are
integrally formed, or the center cap. In this case, the speaker edge has a multilayer structure in
which a plurality of edge layers are stacked, the speaker vibrating body has a multilayer
structure in which a plurality of vibrator layers are stacked, and the center cap is a plurality of
center cap layers stacked. It will have a multilayer structure.
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[0022]
In the plurality of diaphragm layers of the speaker diaphragm 4, the outermost layer on the side
on which the center cap 9 is provided corresponds to an example of the surface layer. The first
diaphragm layer 4a corresponds to an example of the other layer, and the second diaphragm
layer 4b corresponds to an example of one layer and a surface layer.
[0023]
Each diaphragm layer of the speaker diaphragm 4 is made of a material. The material is, for
example, wood pulp fiber, non-wood pulp fiber, chemical fiber, synthetic fiber, animal fiber,
vegetable fiber, organic fiber, inorganic fiber, inorganic fiber, glass fiber, carbon fiber, fibrous
material such as ceramic fiber, mica powder, graphite And particulate materials such as carbonbased materials, metal materials, ceramic materials, and resins. The "material" also includes, for
example, the aforementioned powder, hollow particles, fibers and the like. The material 4a1 of
the first diaphragm layer 4a and the material 4b1 of the second diaphragm layer 4b may be
different types of materials or may be the same type of material.
[0024]
As will be described later, between the diaphragm layers of the speaker diaphragm 4, a plurality
of liquid crystals not including the material of each diaphragm layer are separated, and a
suspension including the material of the diaphragm layer is sequentially formed into a paper The
diaphragm layers of are laminated, and the diaphragm layers are integrated. At this time, the
materials of the two adjacent diaphragm layers are bonded to each other by a chemical bond (the
chemical bond includes van der Waals force, hydrogen bond, metal bond and the like).
Particularly when the material is a natural fiber, it is bonded by hydrogen bonding. The
suspension corresponds to an example of the first liquid and the second liquid. The speaker
diaphragm 4 having this structure has a relatively large coupling force between the diaphragm
layers, so that problems such as delamination can be prevented. In the speaker diaphragm 4
having a structure laminated by paper forming, an entangled portion 4z in which fibrous
materials (in particular, fibers) of the diaphragm layers are intertwined is formed at the boundary
between the diaphragm layers. . The diaphragm layers are integrally formed by the entangled
portion 4z, the integral force (including the coupling force) between the diaphragm layers is
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increased, and problems such as delamination can be suppressed.
[0025]
The thickness of the first diaphragm layer 4a and the second diaphragm layer 4b is the thickness
of the entangled portion 4z formed at the boundary between the first diaphragm layer 4a and the
second diaphragm layer 4b of the speaker diaphragm 4 Preferably, the thickness is smaller than
the thickness of the first diaphragm layer 4a or the thickness of the second diaphragm layer 4b
so as to have a predetermined thickness.
[0026]
(Structural Example of Manufacturing Apparatus and Manufacturing Method of Loudspeaker
Diaphragm) Hereinafter, with reference to FIG. 2 to FIG. To explain.
[0027]
FIG. 2 is a diagram for explaining a manufacturing apparatus of a speaker diaphragm, and is a
diagram for explaining an example of a first diaphragm layer forming step of a method of
manufacturing a speaker diaphragm.
FIG. 3 is a view for explaining an example of a liquid layer injection step of the method for
manufacturing the speaker diaphragm.
FIG. 4 is a view for explaining an example of the second diaphragm layer forming step of the
method for manufacturing the speaker diaphragm. FIG. 5 is a view for explaining an example of
the state of deposition after the injection of the suspension liquid containing the material of the
second diaphragm layer. FIG. 6 is a view for explaining an example of the molding process of the
method of manufacturing the speaker diaphragm. FIG. 7 is a view for explaining an example of
another forming step of the method of manufacturing the speaker diaphragm.
[0028]
The speaker diaphragm manufacturing apparatus 20 sequentially injects the suspension liquid
containing the material of the diaphragm layer into the common tank for forming a paper, with
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the liquid layer not containing the material of the diaphragm layer separated. Then, the
suspension is sequentially formed to laminate a plurality of diaphragm layers. The manufacturing
apparatus 20 of the speaker diaphragm corresponds to an example of a laminate manufacturing
apparatus.
[0029]
As shown in FIG. 2, the speaker diaphragm manufacturing apparatus 20 includes a tank 30, a
dewatering device 61, a liquid injection device 62, and a control device 70.
[0030]
The tank 30 includes a tank body 31, a papermaking unit 40, and a liquid injection unit 50.
[0031]
The tank main body 31 is formed in a cylindrical shape (cylindrical shape in the illustrated
example) using a light transmitting material such as acrylic, for example, and a suspension
containing a liquid such as water or a diaphragm material inside thereof. Liquid such as liquid is
injected.
That is, the tank body 31 contains the liquid.
The tank main body 31 corresponds to an example of a tank wall (in the illustrated example, the
wall is formed in a tubular shape).
[0032]
The papermaking section 40 includes an attachment portion 41, a mold 42, a net 43, and an
inclined surface portion 44. The mounting portion 41 is formed in a concave shape, and the mold
42, the net 43 and the inclined surface portion 44 are disposed in the mounting portion 41. A
connection port 41B as an example of a dewatering port to which a dewatering device 61
described later is connected is provided at a central portion of the bottom of the attachment
portion 41, and a valve is provided at the connection port 41B. The mold 42 includes a plurality
of suction ports 42A and a support surface 42B to which the plurality of suction ports 42A are
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attached and which supports the mesh 43. The plurality of suction ports 42A are connected to
the dehydrating apparatus 61. The support surface 42B is formed in a concave shape, and the
mesh 43 is disposed on the support surface 42B. The inclined surface portion 44 is connected to
the outer peripheral portion 43 a of the mesh 43.
[0033]
The mesh 43 is formed in a shape prescribed in advance according to, for example, the shape of
the speaker diaphragm, and is formed in a cone shape in this configuration example. In the mesh
43, for example, a plurality of holes are formed, and of the suspension containing the material of
the diaphragm layer, the material is deposited on the mesh 43 and the liquid is allowed to pass
through the holes. For example, wire mesh or punching metal can be employed as the mesh 43.
The inclined surface portion 44 is a tubular (substantially cylindrical in the illustrated example)
member formed in an inclined surface shape (tapered surface shape) in which the inner
peripheral surface gradually decreases in internal diameter from the upper end 44a toward the
lower end 44b. is there. The edge of the lower end 44b of the inclined surface portion 44 is
connected to the outer peripheral portion 43a of the net 43 over the entire circumference. The
edge of the upper end 44 a of the inclined surface portion 44 is supported by the mounting
portion 41 over the entire circumference.
[0034]
In the papermaking section 40, a stepped portion 41C formed at the edge on the upper end side
of the attachment portion 41 is detachably fitted to the lower end of the tank main body 31.
Further, at this time, the tank main body 31, the attachment portion 41, the mold 42 and the net
43 are arranged such that their respective axis centers on the axis L.
[0035]
The liquid injection unit 50 includes a liquid injection port 51 and a conduit 52. The liquid inlet
51 is opened in a slit shape (i.e., an annular shape) on the inner peripheral surface 31 a of the
tank body 31 at the lower portion of the tank body 31 (i.e., the lower portion of the tank 30).
Thereby, the liquid can be injected from the liquid inlet 51 over the entire circumferential
direction of the tank body 31. The liquid inlet 51 may be provided at least in the lower part of
the tank 30, but in the present configuration example, as an example, the liquid inlet 51 is a
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lower part of the tank 30 and the papermaking section 40 (specifically, an inclined It is disposed
above the upper end 44 a) of the surface portion 44. The conduit 52 is connected to the liquid
inlet 51 and is configured to lead the liquid supplied from the liquid injector 62 to the liquid inlet
51.
[0036]
The dewatering device 61 includes, for example, a suction pump, and is connected to each
suction port 42A of the mold 42. The dewatering device 61 sucks the liquid and the like in the
liquid stored in the tank main body 31 through a net 43 provided in the lower part of the tank
30. The dewatering device 61 is connected to the control device 70 and operates in response to a
control signal from the control device 70.
[0037]
The liquid injection device 62 includes a storage tank for containing the liquid to be injected into
the tank 30, and a pump (not shown) for delivering the liquid contained in each storage tank to
the conduit 52 connected to the tank 30. One or more storage tanks may be provided, and the
liquid may be stored in the storage tank for each different type of liquid. The liquid injection
device 62 is connected to the control device 70 and operates in response to a control signal from
the control device 70.
[0038]
The control device 70 is configured to include, for example, a microcomputer and the like, and
controls the entire manufacturing device 20 in an integrated manner to realize the function
according to the present invention. The control device 70 controls the operation of the
dewatering device 61, the liquid injection device 62, and the like. Under the present
circumstances, as shown in FIG. 2, the control apparatus 70 performs said control based on the
detection result of the sensor 32 provided in the tank 30. As shown in FIG. The sensor 32 detects
characteristics of the liquid or material in the tank 30, such as the level of the liquid, the degree
of dispersion of the material in the liquid, the degree of flow of the liquid, and the like, and
outputs a signal indicating the detection result to the control device 70 Do.
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[0039]
In addition, as described later, the tank 30 is formed of the tank main body 31 so that the
suspension liquid containing the material of the diaphragm layer can be sequentially injected,
with the liquid layer not containing the material of the diaphragm layer separated. Preferably, the
length is greater than a predetermined length.
[0040]
Next, an example of a method of manufacturing the speaker diaphragm using the manufacturing
apparatus 20 will be described with reference to the drawings.
In this manufacturing method, water is employed as a liquid contained in a liquid used for
papermaking.
[0041]
The method of manufacturing the speaker diaphragm includes (1) diaphragm layer forming step
and (2) forming step. The diaphragm layer forming step includes (1-a) first diaphragm layer
forming step, (1-b) liquid layer injection step, and (1-c) second diaphragm layer forming step as
sub-steps. .
[0042]
(1) Diaphragm Layer Forming Step In the diaphragm layer forming step, the first suspension K1
and the second suspension K2 containing materials for forming each diaphragm layer are
sequentially injected into the tank 30, and the inside of the tank 30 is formed. Dehydrate the
solution. The first suspension K1 corresponds to an example of the first liquid, and the second
suspension K2 corresponds to an example of the second liquid.
[0043]
(1-a) First diaphragm layer forming step First, as shown in FIG. 2, the first suspension K1
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containing the material 4a1 of the first diaphragm layer 4a is poured into the tank 30. At this
time, the liquid injection device 62 is controlled by the control device 70, and the first
suspension liquid K1 prepared in advance with the material 4a1 contained in water is injected
from the liquid injection port 51. Alternatively, the material 4a1 may be injected (charged) into
the tank 30 while injecting a liquid such as water into the tank 30 from the upper end opening of
the tank 30. The method of injecting the first suspension K1 which is first injected into the tank
30 is optional. In the tank 30, a first suspension liquid layer R51 in which the material 4a1 is
dispersed in water is formed. In the mesh 43 of the prescribed shape, liquid (i.e., water) passes
through and is dehydrated, and the material 4a1 is deposited on the mesh 43. At this time, the
dewatering device 61 may be controlled by the control device 70 to forcibly suction and dewater
the liquid, or may be dewatered by free fall without forced suction. In the first diaphragm layer
forming step, the injection speed of the first suspension K1, the dehydration speed of the liquid,
and the like are appropriately adjusted so that the water level of the liquid in the tank 30 does
not become lower than the liquid injection port 51.
[0044]
(1-b) Liquid Layer Injection Step After injecting the material 4a1 of the first diaphragm layer 4a
into the tank 30, as shown in FIG. 3, the control unit 70 controls the liquid injection device 62 to
predefine it. An amount of liquid W (water) is injected from the liquid inlet 51. At this time, in a
state where the liquid level in the tank 30 is at a position higher than the liquid inlet 51, the
liquid W is injected in the liquid in the tank 30. Moreover, it is preferable to inject the liquid W at
such a speed that the liquid level in the tank 30 is not disturbed (corrugated). In the tank 30, a
liquid layer R52 not containing the material of the diaphragm layer is formed. The thickness (the
length along the vertical direction of the tank 30) of the liquid layer R52 may be determined
according to various conditions such as the specific gravity of the material of each diaphragm
layer, the falling speed of the material in the liquid, etc. preferable. At this time, the control
device 70 may control the dewatering device 61 to forcibly suck the liquid for dehydration, or
the liquid may be dewatered by free fall without forced suction. Also in the liquid layer injection
step, the injection speed of the liquid W, the dewatering speed of the liquid, and the like are
appropriately adjusted so that the water level in the tank 30 does not become lower than the
liquid injection port 51.
[0045]
(1-c) After the second diaphragm layer forming step solution W is poured into the tank 30, as
shown in FIG. 4, the second suspension K2 prepared in advance by adding the material 4b1 to
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water is poured into the liquid It is injected into the tank 30 from the inlet 51. At this time, in a
state where the water level in the tank 30 is at a position higher than the liquid inlet 51, the
second suspension K2 is injected in the liquid in the tank 30. Further, it is preferable to inject the
second suspension K2 at such a speed that the liquid level in the tank 30 is not disturbed
(corrugated). In the tank 30, a second suspension liquid layer R53 in which the material 4b1 is
dispersed in water is formed. In the mesh 43, the liquid (ie, water) passes and is dehydrated, and
the material 4b1 of the second diaphragm layer 4b is deposited so as to overlap on the material
4a1 of the first diaphragm layer 4a deposited on the mesh 43 . At this time, the liquid may be
forcibly sucked and dewatered by the dewatering device 61, or the liquid may be dewatered by
free fall without forced suction.
[0046]
Further, as shown in FIG. 5, after the second suspension K2 is injected, the controller 70 controls
the liquid injection device 62 to inject a predetermined amount of liquid W from the liquid
injection port 51, A liquid layer R54 not including the material of the diaphragm layer may be
formed.
[0047]
Then, the liquid component (water) in the tank 30 is dewatered, and a multilayer paperfabricated body in which the material 4a1 of the first diaphragm layer 4a and the material 4b1 of
the second diaphragm layer are laminated on the mesh 43 is obtained.
[0048]
In this configuration example, in the diaphragm layer forming step, the liquid layer injecting step
is interposed between the first diaphragm layer forming step and the second diaphragm layer
forming step.
That is, a predetermined period from the end of the injection of the first suspension K1
performed in the first diaphragm layer forming step to the start of the injection of the second
suspension K2 performed in the second diaphragm layer forming step. In the liquid in the tank
30, the liquid W not containing the material of each diaphragm layer is injected during this
predetermined period.
Further, by providing the above-mentioned predetermined period, the material 4a1 precipitates
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and deposits on the mesh 43 after the injection of the first suspension K1, and the material of the
diaphragm layer is not included even if the liquid W is not injected. If the liquid layer R52 is
formed, the liquid layer injecting step of injecting the water W in the predetermined period may
be omitted.
[0049]
Further, in the above process, the control device 70 performs the first process according to the
state of the first suspension liquid layer R51, the liquid layer R52 and the second suspension
liquid layer R53, the deposition (stacking) state on the net, and the like. The injection timing and
injection rate of the suspension K1, the second suspension K2 and water W, or the dehydration
rate is adjusted. Not limited to this, for example, instead of the control device 70, the dewatering
device 61 and the liquid injection device 62 may be operated manually while a worker visually
checks the inside of the tank 30, and the like.
[0050]
Further, in this configuration example, in the diaphragm layer forming step, since the
papermaking section 40 (specifically, the net 43) is provided in the lower portion of the tank 30,
dehydration starts from the time when the liquid is injected into the tank 30. Then, the process is
continued until the liquid in the tank 30 is exhausted. However, for dehydration, if the material
4a1 included in the first suspension K1 and the material 4b1 included in the second suspension
K2 are sequentially deposited and dehydrated on the mesh 43, the diaphragm layer forming step
The start time and duration of dehydration are optional. Further, since the material 4a1 included
in the first suspension K1 and the material 4b1 included in the second suspension K2 are
sequentially deposited, the start timing and duration of the dehydration can be arbitrarily
changed. For example, dehydration may be performed continuously from the end of the injection
of the first suspension K1 (including immediately after the end of the injection and after a while
after the end of the injection for a while) from the end of the injection of the second suspension
K1. The dehydration may be started at the latest before the start of the injection of the second
suspension.
[0051]
(2) Forming step In the diaphragm layer forming step described above, a multi-layered sheet-
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formed body in which the material 4a1 of the first diaphragm layer 4a and the material 4b1 of
the second diaphragm layer formed on the net 43 are laminated , A precursor of the speaker
diaphragm 4) by a molding method such as a hot press method, a wet press method, an oven
method or the like, and the speaker diaphragm 4 as shown in FIGS. 1 (b) and 1 (c) Make
Specifically, the multi-layered paper-made product is taken out from the mesh 43 and, as shown
in FIG. 6, for example, a female die 81 provided with a heating portion 811 and a male die 82
provided with a heating portion 821 The speaker diaphragm 4 having a predetermined shape is
manufactured by heating and pressurizing with a mold 80 having the same.
[0052]
Alternatively, the multi-layered paper-made product is taken out from the mesh 43, and, for
example, as shown in FIG. 7, the multi-layered paper-made product is placed in a mold 83 having
a hollow portion 831 placed in a drying kettle 800. While suctioning by the vacuum pump 832,
drying is performed by a heating device 84 such as a gas stove disposed above the mold 83. In
this method, the speaker diaphragm 4 is manufactured only by drying without applying pressure.
[0053]
Next, one specific example of a method of manufacturing a speaker diaphragm having a twolayer structure will be described.
[0054]
As a material 4a1 of the base material layer (the first diaphragm layer 4a), NBKP (softwoodbleached kraft pulp) of wood pulp fiber is adopted.
First, the NBKP of this wood pulp fiber is beaten, and it is set to a freeness of about 20 ° SR
(Shopper-Riegler) and dispersed in water, and a suspension having a concentration of about 1.0 g
/ L (first suspension) Prepare K1). As shown in FIG. 2, the first suspension K1 is injected into the
tank 30 from the liquid inlet 51. The material 4a1 starts to settle due to its own weight after
injection, but then it is dewatered by the dewatering device 61 from the suction port 42A of the
mold 42 and dewatered, the material 4a1 is placed on the mesh 43 of a predetermined shape.
Deposit on After the first suspension liquid K1 is injected, water W is continuously injected from
the liquid inlet 51 into the liquid in the tank 30, and as shown in FIG. 3, a liquid layer R52 not
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containing the material of the diaphragm layer is formed. Do. During this time, dehydration is
continued.
[0055]
Next, NBKP (softwood bleached kraft pulp) is adopted as the material 4b1 of the surface layer
(the second diaphragm layer 4b), and the material prepared by adjusting this NBKP to a beating
degree of about 20 ° SR is dispersed in water which is a liquid A suspension of about 1.0 g / L
(second suspension K2) is prepared in advance. After the injection of the liquid W, as shown in
FIG. 4, the second suspension K 2 is injected from the liquid inlet 51 in the liquid in the tank 30.
At this time, suction by the dewatering device 61 is continuously performed, and the material 4 b
1 is deposited on the net 43. The strength of suction at this time needs to be balanced with the
amount of water supplied. The dehydrating apparatus 61 according to this configuration
example can adjust the vacuum pressure to about 0 to 500 mmHg (0 to 66,660 Pa). The tank
body 31 is removed from the papermaking section 40, and the mesh 43 is placed on the mold 80
of the same shape and suctioned, whereby the deposited material is transferred onto the mold 80
as shown in FIG. At this time, the mold 80 is heated to a temperature of about 160 ° C. and
dried by pressing at a pressure of about 2 kg / cm <2> (196 kPa) for about 40 seconds. In the
example described above, the first diaphragm layer 4a and the second diaphragm layer 4b may
be dyed in different color tones.
[0056]
As described above, the speaker diaphragm 4 of the present embodiment includes the first
diaphragm layer 4a and the second diaphragm layer 4b, which are respectively formed of sheetformed materials 4a1 and 4b1 and are stacked on one another. The first diaphragm layer 4a and
the second diaphragm layer 4b are integrated at their boundary portion. Since it did in this way,
without using an adhesive fiber etc., the bondability between each layer can be improved and a
layer separation can be suppressed at low cost. For the purpose of adjusting the physical
properties of the speaker diaphragm, polyvinyl alcohol fibers, polyvinyl alcohol fibers having
boron, or adhesive fibers such as heat fusion fibers may be used.
[0057]
Further, at the boundary between the first diaphragm layer 4a and the second diaphragm layer
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4b, an entangled portion 4z is formed in which the materials contained in the first diaphragm
layer 4a and the second diaphragm layer 4b are mutually entangled. It is done. Therefore, the
first diaphragm layer 4a and the second diaphragm layer 4b can be integrated by the entangled
portion at their boundary portion, and the integrity between the layers can be enhanced to
suppress interlayer separation.
[0058]
Further, since the thickness of the entangled portion 4z is smaller than that of the first
diaphragm layer 4a or the second diaphragm layer 4b, the integrity of the first diaphragm layer
4a and the second diaphragm layer 4b is enhanced, Separation of the diaphragm layer 4a and the
second diaphragm layer 4b can be suppressed. Further, while maintaining a predetermined
thickness of the first diaphragm layer 4a and the second diaphragm layer 4b, the integrity of the
first diaphragm layer 4a and the second diaphragm layer 4b is enhanced, and the first diaphragm
layer is formed. Separation of the second diaphragm layer 4b from the second diaphragm layer
4b can be suppressed. Further, since the predetermined thickness of the first diaphragm layer 4a
and the second diaphragm layer 4b can be maintained, the acoustic characteristics of the speaker
device using the speaker diaphragm according to the present invention can be improved.
[0059]
Moreover, it has peeling strength between the 1st diaphragm layer 4a and the 2nd diaphragm
layer 4b. Therefore, the integrity between the layers can be enhanced to suppress interlayer
separation.
[0060]
When the second diaphragm layer 4b is a surface layer, the second diaphragm layer 4b has a
uniform thickness throughout. If the thickness of the second diaphragm layer 4 b is uneven and
there is almost no thickness at a predetermined position, desired physical properties of the
speaker diaphragm 4 can not be obtained. For this reason, the acoustic characteristics of the
speaker device are reduced. However, since the second diaphragm layer 4b of the speaker
diaphragm 4 according to the present invention has a uniform thickness, desired physical
properties of the speaker diaphragm 4 can be obtained, and the acoustic characteristics of the
speaker device can be improved. Acoustic characteristics can be obtained.
10-05-2019
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[0061]
In addition, the first diaphragm layer 4a adjacent to the second diaphragm layer 4b has a
uniform thickness throughout. If the thickness of the first diaphragm layer 4a is uneven and
there is almost no thickness at a predetermined position, desired physical properties of the
speaker diaphragm 4 can not be obtained. For this reason, the acoustic characteristics of the
speaker device are reduced. However, since the first diaphragm layer 4a of the speaker
diaphragm 4 according to the present invention has a uniform thickness, desired physical
properties of the speaker diaphragm 4 can be obtained, and the acoustic characteristics of the
speaker device can be improved. Acoustic characteristics can be obtained.
[0062]
Although the present invention has been described above by way of the preferred embodiments,
the present invention is not limited to the configurations of the above embodiments.
[0063]
For example, in the above-described speaker diaphragm, the first diaphragm layer 4a may be a
surface layer.
Further, the speaker diaphragm 4 may have a multilayer structure of three or more layers, and in
this case, at least the third diaphragm layer 4c is provided. Also in the third diaphragm layer 4c,
when the first diaphragm layer 4a and the second diaphragm layer 4b have uniform thicknesses,
desired physical properties of the speaker diaphragm 4 can be obtained, and the acoustic
characteristics of the speaker device Can be improved and desired acoustic characteristics can be
obtained.
[0064]
Also, for example, although the method of manufacturing the speaker diaphragm described
above is a method of manufacturing the speaker diaphragm 4 having a two-layer structure, the
present invention is not limited to this. It may be a method of manufacturing a speaker
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19
diaphragm 4A having a multilayer structure of three or more layers shown in FIGS. 8 (a) and 8
(b). The speaker diaphragm 4A has a three-layer structure in which a first diaphragm layer 4d, a
second diaphragm layer 4e, and a third diaphragm layer 4f are sequentially stacked. A foam layer
is formed as the second diaphragm layer 4 e which is an intermediate layer. This foam layer is
produced by forming a micro hollow body (foam material in the form of hollow particles) having
a property of expanding by heating, and then heating and compressing.
[0065]
A method of manufacturing the speaker diaphragm 4A having the three-layer structure will be
briefly described. (1) The suspension (first suspension) containing the material of the first
diaphragm layer 4d is injected into the tank 30. (2) In the liquid in the tank 30, water (liquid) not
containing the material of the diaphragm is injected from the liquid inlet 51. At this time, a liquid
layer consisting of water is formed on the suspended liquid layer consisting of the first
suspension liquid. (3) Suspension liquid (second suspension) containing a micro hollow body
(foam material in the form of hollow particles) having the property of being expanded by heating
as a material of the second diaphragm layer 4 e in the liquid in the tank 30 Is injected from the
liquid inlet 51. At this time, a suspension liquid layer consisting of a second suspension liquid is
formed on the liquid layer in an overlapping manner. (4) In the liquid in the tank 30, water
(liquid) not containing the material of the diaphragm is injected from the liquid inlet 51. At this
time, a liquid layer consisting of water is formed on the suspension layer consisting of the second
suspension liquid. (5) In the liquid in the tank 30, a suspension (third suspension) containing the
material of the third diaphragm layer 4f is injected. At this time, a suspension liquid layer
consisting of a third suspension liquid is formed on top of the liquid layer. Then, the liquid in the
tank 30 is discharged by dehydration performed in parallel with the injection of the liquid, and
the first diaphragm layer 4d, the second diaphragm layer 4e, and the third diaphragm layer 4f
are discharged on the mesh 43. A laminated multi-layered paper-making body is obtained. As
shown in FIG. 6, the multilayer sheet-formed body is heated and pressed by a mold 80 in
substantially the same manner as in the above embodiment to produce a speaker diaphragm 4A
having a three-layer structure as shown in FIG.
[0066]
Next, one specific example of a method of manufacturing a three-layered speaker diaphragm will
be described.
[0067]
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20
As a material of the base material layer (the first diaphragm layer 4d), a pulp fiber prepared at
NBKP 20 ° SR as in the first embodiment is used, and a cationic sizing agent is used to further
increase the waterproofness of the pulp material. Add about 5%.
As a material of the intermediate layer (the second diaphragm layer 4e), for example, a micro
hollow body having an average particle diameter of about 20 μm and having a property of
expanding by heating is dispersed in water (liquid) to a concentration of about 1.0 g / L. A turbid
solution (second turbid solution) is prepared. As a material of the surface layer (third diaphragm
layer 4f), a raw material in which mica powder is mixed at a ratio of 10% to the same pulp
material (90%) as the base material layer (first diaphragm layer 4d) is used. The concentration is
adjusted to about 0 g / L, and a sizing agent is similarly added to about 5% to prepare a turbid
solution (third turbid solution).
[0068]
First, the material of the base material layer and water are injected into the tank 30 to form a
turbid solution (first turbid solution). Then, water is injected from the liquid inlet 51 in the liquid
in the tank 30, and then a second turbid liquid is injected from the liquid inlet 51 in the liquid in
the tank 30. Further, water is injected from the liquid inlet 51 in the liquid in the tank 30, and
then a third turbidity liquid is injected from the liquid inlet 51 in the liquid in the tank 30. In the
papermaking section 40, the liquid in the tank 30 is dewatered in parallel with the injection of
each liquid, and a multilayer composed of the first diaphragm layer 4d, the second diaphragm
layer 4e, and the third diaphragm layer 4f on the mesh 43 A machined body is obtained. Then,
this multilayer sheet-formed body is pressed and dried in the same manner as in the first
embodiment using a mold 80 heated to about 160.degree. When heated, the micro hollow body
expands, and as shown in FIG. 8B, the speaker diaphragm 4A in which the foam layer is formed
on the second diaphragm layer 4e is completed.
[0069]
In the speaker diaphragm 4A, the material of the first diaphragm layer 4d and the material of the
second diaphragm layer 4e are intertwined at the boundary between the first diaphragm layer 4d
and the second diaphragm layer 4e. A first entangled portion 4x is formed. In addition, at the
boundary between the second diaphragm layer 4e and the third diaphragm layer 4f, the second
entangled portion 4y in which the material of the second diaphragm layer 4e and the material of
10-05-2019
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the third diaphragm layer 4f are entangled is It is formed. The thickness of the first entangled
portion 4x is smaller than the thickness of the first diaphragm layer 4d, the second diaphragm
layer 4e, or the third diaphragm layer 4f. Similarly, the thickness of the second entangled portion
4y is smaller than the thickness of the first diaphragm layer 4d, the second diaphragm layer 4e,
or the third diaphragm layer 4f.
[0070]
In the speaker diaphragm 4, the first diaphragm layer 4d, the second diaphragm layer 4e, and
the third diaphragm layer 4f are integrated with each other, and the first diaphragm layer 4d and
the second diaphragm layer 4e are formed. Or to the extent that it is difficult to peel off the third
diaphragm layer 4f, it had high peeling strength.
[0071]
In the above-described speaker diaphragm manufacturing apparatus 20, the liquid inlet 51 is
disposed below the tank 30 and above the papermaking section 40 (specifically, the upper end
44a of the inclined surface section 44). Although it was opened horizontally, of course, it is not
limited to this.
For example, as shown in FIG. 9, the liquid inlet 51A may be disposed on the inner peripheral
surface of the tank body 31 in the circumferential direction and open downward. Alternatively, as
shown in FIG. 10, the conduit 52 may be extended to the central portion of the tank main body
31, and the tip opening of the conduit 52 may be a liquid inlet 51B and directed horizontally,
vertically or upward. Good. That is, as long as the liquid can be injected into the liquid in the tank
30, the opening direction of the liquid inlet 51 is not limited to the horizontal direction, the
downward direction, or the upward direction unless it is contrary to the object of the present
invention. is there.
[0072]
Further, in the above-described manufacturing apparatus 20 for a speaker diaphragm, the first
suspension K1 corresponds to an example of the first liquid, and the second suspension K2
corresponds to an example of the second liquid. Here, the first liquid and the second liquid
indicate that the first liquid is injected first and the second liquid is injected after the first liquid,
that is, "first", "second" And are merely indicative of relative order relations, not absolute order
10-05-2019
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relations. That is, this does not mean that the first liquid is injected first among all the liquids,
and the second liquid is injected second among all the liquids. For example, when four kinds of
liquids are sequentially injected, when focusing on the liquid to be injected second and the liquid
to be injected third, the former corresponds to an example of the first liquid, and the latter
corresponds to the example of the second liquid. Equivalent to. Similarly, when focusing on the
third injected liquid and the fourth injected liquid, similarly, the former corresponds to an
example of the first liquid, and the latter corresponds to an example of the second liquid.
[0073]
The above-described embodiment only shows a typical form of the present invention, and the
present invention is not limited to the embodiment. That is, those skilled in the art can carry out
various modifications without departing from the gist of the present invention in accordance with
conventionally known findings. As long as the configuration of the speaker diaphragm of the
present invention is provided even by this modification, it is of course included in the scope of
the present invention.
[0074]
(Verification) The speaker diaphragms of Examples 1 and 2 and Comparative Example 1 shown
below were prepared for speaker diaphragms, and physical property values were measured and
compared for each.
[0075]
(Example 1) The speaker diaphragm of Example 1 is manufactured using the above-described
method for manufacturing a speaker diaphragm, and is a first diaphragm layer made of NBKP of
wood pulp fibers having a freeness of 20 ° SR. And a second diaphragm layer made of NBKP of
wood pulp fibers having the same freeness of 20 ° SR.
The density of the first diaphragm layer is higher than the density of the second diaphragm layer.
The first diaphragm layer and the second diaphragm layer are integrated at the boundary
portion.
[0076]
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(Example 2) The speaker diaphragm of Example 2 is manufactured using the above-described
method for manufacturing a speaker diaphragm and is a first diaphragm layer made of NBKP of
wood pulp fibers having a freeness of 20 ° SR. And a second diaphragm layer made of NBKP of
wood pulp fibers having a freeness of 20 ° SR, and a fabric disposed between the first
diaphragm layer and the second diaphragm layer. ing. This woven fabric is composed of
polypropylene-based fibers. The first diaphragm layer and the fabric, and the second diaphragm
layer and the fabric are integrated at their boundary portion.
[0077]
Comparative Example 1 The loudspeaker diaphragm of Comparative Example 1 is configured to
have a single diaphragm layer made of NBKP of wood pulp fibers having a freeness of 20 ° SR.
[0078]
Table 1 shows measurement results of physical properties of the speaker diaphragms of
Examples 1 and 2 and Comparative Example 1.
[0079]
[0080]
As apparent from the above measurement results, the Young's modulus of the speaker
diaphragm of Examples 1 and 2 is larger than the Young's modulus of the speaker diaphragm of
Comparative Example 1.
Further, the propagation speed of the speaker diaphragm of Examples 1 and 2 is higher than the
propagation speed of the speaker diaphragm of Comparative Example 1.
Further, the internal loss of the speaker diaphragm of Examples 1 and 2 is slightly smaller than
or equal to the internal loss of the speaker diaphragm of Comparative Example 1.
[0081]
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In general, the Young's modulus and internal loss of the speaker diaphragm are in inverse
proportion to each other. When one of the Young's modulus and the internal loss is large, the
other is small.
However, in the speaker diaphragms of the first and second embodiments, the first diaphragm
and the second diaphragm are integrated directly or through a fabric, so that the material of the
first diaphragm and the second diaphragm can be obtained. It is considered that internal loss is
improved by the friction of the material. Further, it is considered that the internal loss is
improved because the friction is more likely to occur due to the presence of the entangled
portion at the boundary between the first diaphragm and the second diaphragm.
[0082]
Further, since the density of the speaker diaphragms of Examples 1 and 2 is larger than the
density of the speaker diaphragm of Comparative Example 1, it is considered that the Young's
modulus of the speaker diaphragm is improved. The reason why the density of the speaker
diaphragms of the first and second embodiments is high is that the dewatering time is relatively
long, and the material is attracted to the net and the gaps in the diaphragm layer become
relatively small. On the other hand, when the density of the first diaphragm layer is high, the
material of the second diaphragm layer is less likely to enter the inside of the first diaphragm
layer, so a predetermined thickness or uniform on the first diaphragm layer It is contemplated
that a second diaphragm layer can be formed having a thickness.
[0083]
In the speaker diaphragms of Examples 1 and 2, the first diaphragm layer and the second
diaphragm layer are integrated, and it is difficult to separate the first diaphragm and the second
diaphragm. , Had high peel strength.
[0084]
In the speaker diaphragms of the first and second embodiments, there is an entangled portion at
the boundary between the first diaphragm layer and the second diaphragm.
10-05-2019
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In the entangled portion, the fibers of the first diaphragm layer and the fibers of the second
diaphragm layer are entangled. For this reason, the fibers in the entangled portion penetrate
from the first diaphragm layer toward the second diaphragm layer when the first diaphragm
layer and the second diaphragm layer are formed in this order, and the second diaphragm layer
is formed. In the case where the first diaphragm layer is formed in order, the second diaphragm
layer may intrude toward the first diaphragm layer. Also, the fibers in the layers other than the
entangled portion are deposited along the front surface or the back surface or the boundary of
the speaker diaphragm. Therefore, the direction in which the fibers are deposited in the
entangled portion may be different from the direction in which the fibers are deposited in other
portions than the entangled portion. The entangled portion may be formed over the entire
boundary between the first diaphragm layer and the second diaphragm, or may be formed only
at a predetermined position on the boundary.
[0085]
The difference between the speaker diaphragms of the first and second embodiments and the
comparative example is that there is a boundary portion, that there is an entangled portion, that
the fiber accumulation direction in the entangled portion is different, and others If the density of
the first diaphragm layer is larger than the density of the second diaphragm layer, or if the
density of the first diaphragm layer is greater than the density of the second diaphragm layer, or
if When the sheet is formed in order, the density of the second diaphragm layer may be higher
than the density of the first diaphragm layer. For this reason, there may be a difference that the
density of the entire nest speaker diaphragm is larger in the first and second embodiments than
in the comparative example. Further, since there is a difference in density, the Young's modulus
and the propagation speed of the speaker diaphragm may be larger in the first and second
embodiments than in the comparative example. Although Examples 1 and 2 and the comparative
example described above have been described, in the present embodiment, it is sufficient to have
at least one of these differences, and there is no limitation to having all the differences.
[0086]
4, 4A Speaker Diaphragm 4a1, 4b1 Material (example of material) 4a, 4d first diaphragm layer
(one example of paper-made body) 4b, 4e second diaphragm layer (one example of paper-made
body) 4f third diaphragm layer (An example of a paper machine) 4x 1st interlacing portion 4y
2nd entangled portion 4z entangled portion 10 Speaker device 20 manufacturing device 30 for a
speaker diaphragm 30 tank 31 tank body 32 sensor 40 paper forming portion 41 attachment
portion 41B connection port (dewatering port Example) 42 mold 43 mesh 44 inclined surface 50
liquid injection part 51, 51A, 51B liquid injection port 52 conduit 61 dewatering device 62 liquid
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injection device 70 control device K1 first suspension solution K2 second suspension solution
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