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JP2005223807

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2005223807
PROBLEM TO BE SOLVED: To provide a diaphragm easy to manufacture and having good
characteristics. [Solution] A papermaking raw material is prepared by appropriately blending a
fiber material of at least one of wood pulp, chemical fiber and inorganic fiber, a foaming agent,
and a fine fibrous binder having a high degree of freeness, and making a paper. The molded
product after paper making is mounted in the mold of the drying apparatus having a gap
corresponding to the shape of the diaphragm 400, and while heating and drying, a part of the
vibrating portion 420 is foamed to a large thickness and the foam is foamed A thick portion 421
and a non-foamed non-foamed portion 422 are formed. Reinforce separate sheet-like members or
impregnate synthetic resin, etc. by improving bending stiffness by thickening and improving
strength by entanglement of fibers with fine fibrous binders Instead, weight gain can be
prevented and reinforcement can be partially made in a uniform weight state, and frequency
characteristics can be flattened to obtain good acoustic characteristics. [Selected figure] Figure 1
Diaphragm, method for manufacturing the same, and speaker device
[0001]
The present invention relates to a diaphragm having a vibrating portion and an edge portion and
partially foamed, a method of manufacturing the same, and a speaker device.
[0002]
Conventionally, as a diaphragm that constitutes a speaker device, one manufactured by
appropriately foaming a foaming agent contained in a portion of a vibrating portion is known so
as to obtain predetermined characteristics (see, for example, Patent Document 1) ).
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[0003]
According to Patent Document 1, a resin containing a foaming agent is injected into a cavity of a
mold.
The mold clamping pressure is lowered after a predetermined time for the skin layer formed by
curing from the part in contact with the mold to have an appropriate thickness, and the foaming
of the molten part of the resin inside is promoted to form a foam layer. In addition, as a radially
extending rib, it is formed in a cone shape having a foamed region of a three-layer structure and
an unfoamed region of a one-layer structure.
[0004]
JP-A-2000-246756 (page 3 left column-page 6 left column, FIG. 7)
[0005]
However, in the one produced by foaming after injection molding as described in Patent
Document 1 above, the thickness dimension is partially changed by strict control to lower the
mold clamping pressure of the mold at the time of injection molding. So, advanced manufacturing
technology is required.
Therefore, it is also conceivable to form the sheet by paper making which is widely used and
relatively easy in the manufacturing process as the manufacture of the diaphragm.
However, in the case of sheet-forming, the foaming agent contained in the raw material may fall
off from the net and there is a possibility that a sufficient foaming state can not be obtained. In
addition, by including the foaming agent more than necessary so as to obtain sufficient foaming,
the cost is increased, and there is also a possibility that the variation of the foaming state for
each product may occur due to the variation of the amount of the foaming agent which falls off.
[0006]
An object of the present invention is to provide a diaphragm that is easy to manufacture and can
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obtain excellent characteristics in view of the above-described circumstances and the like, a
method of manufacturing the same, and a speaker device.
[0007]
The invention according to claim 1 is a diaphragm having a vibration agent having a foaming
agent and formed by papermaking, wherein the sheet is made of a papermaking material
containing a fine fibrous binder together with the foaming agent. It is a diaphragm characterized
in that the above-mentioned foaming agent was foamed and formed in the state where a
vibration part became partial thick.
[0008]
The invention according to claim 2 is a vibrating plate having a vibrating portion formed by
making a papermaking raw material containing a foaming agent and mainly containing fibers is
made into paper and dried, and the paper making raw material is in the form of fine fibers The
vibrator is characterized in that it contains a binder, and the vibrating portion is formed by
foaming the foaming agent in a partially thickened state.
[0009]
The invention according to claim 17 is a manufacturing method of a diaphragm which
manufactures a diaphragm having a vibration part by containing a foaming agent and forming by
papermaking, and a fine fibrous binder as well as the foaming agent. It is a method of
manufacturing a diaphragm characterized in that the foaming agent is foamed so as to partially
thicken the vibrating portion after paper making with the contained paper making material.
[0010]
The invention according to claim 18 is a manufacturing method of a diaphragm for
manufacturing a diaphragm having a vibrating portion by making a papermaking raw material
containing a foaming agent and containing a fiber as a main component and drying it. The
papermaking raw material contains a fine fibrous binder, and the foaming agent is foamed in a
partially thickened state to form the vibrating portion.
[0011]
The invention according to claim 20 holds the diaphragm according to any one of claims 1 to 16,
a voice coil attached to the diaphragm, a magnetic body, the diaphragm, and the magnetic body.
And a frame provided with a yoke that forms a magnetic circuit with the magnetic body.
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[0012]
The invention according to claim 21 is a diaphragm manufactured by the method for
manufacturing a diaphragm according to any one of claims 17 to 19, a voice coil attached to the
diaphragm, and a magnetic body. According to another aspect of the present invention, there is
provided a speaker device including: a frame including a yoke that holds the diaphragm and the
magnetic body and forms a magnetic circuit with the magnetic body.
[0013]
Hereinafter, the configuration of an embodiment of the speaker device of the present invention
will be described with reference to the drawings.
In the present embodiment, although a cone type speaker device is illustrated, the present
invention is not limited to this.
[0014]
(Configuration of Speaker Device) FIG. 1 is a cross-sectional view showing a speaker device
according to an embodiment of the present invention.
FIG. 2 is a partially cutaway sectional view showing a diaphragm that constitutes a speaker
device.
FIG. 3 is a plan view showing the vibrating portion of the diaphragm.
In FIG. 1, reference numeral 100 denotes a speaker device, and the speaker device 100 outputs
sound data, which is an electrical signal from a reproduction device connected electrically, by
sound generation.
The speaker device 100 includes a frame 200, a magnet 300 as a magnetic body constituting a
magnetic circuit, a diaphragm 400, a voice coil 500, and a protective member (not shown).
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[0015]
The frame 200 is made of, for example, a hard synthetic resin or a lightweight metal material
such as an aluminum alloy.
The frame 200 includes a substantially concave main body portion 210 expanding toward one
surface, and a magnetic body 220 which is a yoke constituting a magnetic circuit integrally
provided on the main body portion 210. .
[0016]
The main body portion 210 has a substantially cylindrical bottom portion 212 in which a
substantially circular opening 211 is formed substantially at the center of the bottom surface and
is opened toward one side.
On the outer peripheral edge of the bottom portion 212, a plurality of bridge portions 213 are
provided in a substantially radial manner in a state where the bridge portions 213 expand at the
tip end side. Furthermore, at the tip of the bridge portion 213, a mounting step portion 214
substantially in a ring shape and substantially parallel to the bottom surface of the bottom
portion 212 is provided in series. A positioning cylindrical portion 215 formed in a cylindrical
shape substantially coaxial with the bottom portion 212 is provided in series on the outer
peripheral edge of the mounting step portion 214. In addition, a terminal 216 having a terminal
216A to which audio data of an electrical signal is input is integrally attached to the main body
210.
[0017]
The magnetic body 220 includes an upper yoke 221 and a lower yoke 222. The upper yoke 221
is formed in a substantially ring shape of a magnetic material. The upper yoke 221 is integrally
attached to the bottom surface of the main body 210 by, for example, an adhesive in a state
where the inner periphery is coaxial with the opening 211 of the bottom 212. The lower yoke
222 is formed of, for example, the same material as the upper yoke 221. The lower yoke 222 is
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formed in a substantially convex shape having a projecting portion 222B substantially
cylindrically on one surface side substantially at the center of a plate portion 222A on a
substantially disc. The lower yoke 222 is integrally attached to the upper yoke 221 via the
magnet 300 with an adhesive, for example, in a state in which the plate portion 222A clamps the
magnet 300 with the upper yoke 221. In the state in which the lower yoke 222 is attached, the
outer peripheral surface of the protrusion 222B faces the inner peripheral surface of the upper
yoke 221 with a predetermined gap to form a magnetic gap.
[0018]
The magnet 300 is formed, for example, in a ring shape, and pole faces are formed on both end
faces in the axial direction. Then, as described above, the magnet 300 is attached by, for example,
an adhesive in a state of being held between the upper yoke 221 and the plate portion 222A of
the lower yoke 222. In this mounted state, the protrusion 222B of the lower yoke 222 is
penetrated substantially coaxially on the inner peripheral side of the magnet 300. By the
attachment of the magnet 300, the outer peripheral surface of the projection 222B of the lower
yoke 222 and the inner peripheral surface of the upper yoke 221 face each other with different
magnetic poles, and the magnet 300 and the magnetic body 220 constitute a magnetic circuit.
[0019]
As shown in FIGS. 1 to 3, the diaphragm 400 is a so-called fixed edge, and spreads toward one
side formed by paper processing, which is mainly made of fibers and made of fibers. It is formed
in a substantially thin film shape (cone shape). Further, the diaphragm 400 is expanded in, for
example, an elliptical flat shape in which one radial dimension is longer than the other radial
dimension. The diaphragm 400 has a substantially cylindrical attachment portion 410. At one
end in the axial direction of the attachment portion 410, a substantially elliptic truncated
vibration portion 420 that spreads toward one side is provided in series. In the vibrating portion
420, thick portions 421 having a large thickness are provided substantially radially in a rib shape
along the longest direction and the shortest direction in the radial direction. The thick portion
421 is formed thick by foaming, and the other portion is an unfoamed unfoamed portion 422.
Furthermore, an edge portion 430 that protrudes in the outer peripheral direction in a flange
shape is provided on the peripheral edge on the expanding side of the vibrating portion 420. The
edge portion 430 is formed in a wave shape in the radial direction. Furthermore, the edge part
430 has the attachment collar part 431 continuous in a bowl shape at the outermost periphery.
The mounting flange portion 431 is positioned such that the outer peripheral edge abuts on the
inner peripheral surface of the positioning cylindrical portion 215 of the frame 200, and the
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mounting step portion 214 of the frame 200 has a ring-shaped mounting member 440 with an
adhesive, for example. And is supported by the frame 200.
[0020]
In the diaphragm 400, the thickness dimension of the thick portion 421 is 1 or less, preferably
1/2 or more and less than 1, in mass (g / m <2>) ratio of the thick portion 421 to the unfoamed
portion 422. Is preferably 1.5 times or less the thickness of the unfoamed portion 422. By
forming so as to satisfy such conditions, a good viewing effect as the speaker device 100 can be
obtained.
[0021]
In this diaphragm 400, a fiber material such as wood pulp, chemical fiber, inorganic fiber and the
like, a foaming agent, and a fine fibrous binder which is a fiber are appropriately blended as
paper making materials in paper making, and paper making By processing, it is shape | molded
in cone shape, is dried suitably, and is produced. As a fiber material, it is preferable that it is 20
mass% or more preferably by remainder other than a foaming agent and a fine fibrous binder.
[0022]
Here, as wood materials, various wood pulps such as softwood kraft pulp can be used as the
wood pulp. And in the case of only wood pulp, 20 mass% or more and 50 mass% or less are
preferable. When the content is less than 20% by mass, a fine fibrous binder is used for the fibers
to be the aggregate, and the filtration resistance becomes high at the time of sheet making, and
there is a possibility that the net may be clogged to make the sheet forming operation
complicated. On the other hand, if the content is more than 50% by mass, it may fall out of the
net at the time of sheet making, and good foaming of the thick portion 421 may not be obtained.
For this reason, when using only wood pulp as a fiber material, it is preferable to set to 20 mass%
or more and 50 mass% or less.
[0023]
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Moreover, various synthetic resin fibers, such as an aramid fiber whose fiber length is about 2
mm, can be utilized as a fiber material, for example. Moreover, various inorganic fibers, such as
glass fiber and carbon fiber, can be used as the inorganic fiber. When at least one of the chemical
fiber and the inorganic fiber is used in combination with the wood pulp, it is preferable that the
total of at least one of the chemical fiber and the inorganic fiber be 20% by mass or less. When at
least one of the chemical fiber and the inorganic fiber is more than 20% by mass in total, no
fiber-to-fiber bonding with wood pulp is caused, which results in a decrease in strength of the
diaphragm 400 and a decrease in Young's modulus. The diaphragm 400 may not be obtained.
For this reason, it is preferable to set wood pulp as a fiber material to 20% by mass or more and
50% by mass or less and 20% by mass or less in total of at least one of chemical fibers and
inorganic fibers. In addition, heat resistance, a flame retardance, etc. can be provided to the
diaphragm 400 by utilizing what has heat resistance as a chemical fiber. In addition, as a fiber
material, when not using a wood pulp and it is only at least any one among a chemical fiber and
an inorganic fiber, 80 mass% or less is preferable in total. If the total amount of the chemical
fiber and the inorganic fiber is more than 80% by mass, the relative amount of the fine fibrous
binder decreases, and it may fall out of the net at the time of paper making, and good foaming of
the thick portion 421 may not be obtained. is there. For this reason, it is preferable to set at least
one of chemical fiber and inorganic fiber as the fiber material to 80 mass% or less in total.
[0024]
Also, as a foaming agent, for example, microcapsules containing a low boiling point hydrocarbon
in a vinylidene chloride copolymer and rapidly foaming at about 140 ░ C., and a chemical
foaming agent in an olefin-based resin The microcapsule etc. which decompose | disassemble at
about 160 degreeC and generate | occur | produce nitrogen gas mainly are used. In addition, any
material that can be foamed at the time of drying after molding in papermaking processing can
be used. In addition, when it is the purpose of providing waterproofness as the diaphragm 400,
the thing of the synthetic resin which has water repellency by foaming is preferable as a foaming
agent, for example. That is, due to the mixture of the water repellent foaming agent, it is not
necessary to separately perform the water repellent treatment or to mix the water repellent
material. And as a particle size of a foaming agent, 20 micrometers or more and 100
micrometers or less are preferable, for example. When the particle size is smaller than 20 ?m, it
is likely to fall out of the net at the time of sheet making, and there is a possibility that a desired
foamed state can not be obtained. In addition, when the particle diameter is larger than 100 ?m,
the unevenness of the surface of the thick portion 421 becomes large at the time of foaming, and
the appearance may be deteriorated. For this reason, it is preferable to set the particle size to 20
?m or more and 100 ?m or less. And a foaming agent is mix | blended by 1 mass% or more and
20 mass% or less, and a papermaking raw material is prepared. Here, if the amount is less than
1% by mass, sufficient foaming of the thick portion 421 can not be obtained. Moreover, even if it
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becomes more than 20 mass%, increase of the foaming ratio of the thick part 421 is hardly
recognized, but cost increases. For this reason, it is preferable to set a foaming agent to 1 mass%
or more and 20 mass% or less.
[0025]
Furthermore, as a fine fibrous binder, for example, wood pulp, which is a wood pulp-based
material, fibers are branched into fibrils by beating by beating, the specific surface area is
increased, and they tend to be intertwined on the net and cause hydrogen bonding. The state is
used. In addition, various fibers such as bast fibers can be used as well as kraft pulp of various
types of wood. The fine fibrous binder has a beating degree of, for example, 50 ml or more and
200 ml or less according to Canadian Freeness Standard. If the value is less than 50 ml in the
Canadian Freeness Standard, the beating process is complicated and the preparation of the fine
fibrous binder becomes difficult, which may lead to an increase in cost. On the other hand, when
the value is larger than 200 ml, there is no significant difference in the supportability of the
foaming agent from the case of making a paper pulp using wood pulp without using the fine
fibrous binder, and the addition effect of the fine fibrous binder is not recognized. For this
reason, it is preferable to set the beating degree of the fine fibrous binder to 50 ml or more and
200 ml or less according to Canadian Freeness Standard. And this fine fibrous binder is mix |
blended by 1 to 80 mass%, and a papermaking raw material is prepared. Here, if the amount is
less than 1% by mass, the foaming agent is not sufficiently supported at the time of sheet making,
so it is likely to fall out of the net, and a desired foamed state may not be obtained. On the other
hand, if the amount is more than 80% by mass, the filtration resistance may be increased and the
mesh may be clogged to make the sheet forming operation complicated. Therefore, it is
preferable to set the fine fibrous binder to 80% by mass or less, more preferably 10% by mass or
more and 20% by mass or less.
[0026]
Further, a substantially cylindrical coil bobbin 450 is integrally provided on the diaphragm 400.
The coil bobbin 450 is made of, for example, the same material as that of the diaphragm 400, or
a metal such as aluminum or a synthetic resin containing fibers such as a synthetic resin or glass
fiber. The coil bobbin 450 is formed in a substantially cylindrical shape whose outer diameter is
substantially the same size as the inner diameter of the attachment portion 410 of the diaphragm
400, and one end side in the axial direction is integrally attached using, for example, an adhesive.
The coil bobbin 450 may have a configuration in which a spherical dome-shaped dust cap for
closing the end face is bonded integrally with, for example, an adhesive at one end side of the
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side where the diaphragm 400 is expanded.
[0027]
Further, the coil bobbin 450 is integrally provided with a substantially disc-shaped mounting
support portion 460. The mounting support portion 460 is made of, for example, the same
material as the coil bobbin. The mounting support portion 460 has a substantially cylindrical
shape in which the coil bobbin 450 is inserted at substantially the center, and has a cylindrical
portion (not shown) whose inner peripheral surface is integrally attached to the outer peripheral
surface of the coil bobbin 450 by, for example, an adhesive. ing. Furthermore, the mounting
support portion 460 is provided with a series of movable portions 462 that are formed in the
shape of a flange in the radial direction at one axial end of the cylindrical portion 461 and in the
shape of a wave in the radial direction. Further, on the outer peripheral edge of the movable
portion 462, a collar portion 463 which protrudes in a bowl shape and is attached to the
peripheral edge of the bottom portion 212 of the frame 200 with, for example, an adhesive is
provided in series. Then, the flange 463 of the mounting support 460 is attached to the
periphery of the bottom 212 of the frame 200, the attachment flange 431 of the edge 430 of the
diaphragm 400 is attached to the attachment step 214 of the frame 200, and the coil bobbin 450
is A diaphragm 400 integrally mounted is disposed on the frame 200.
[0028]
The voice coil 500 is wound around the outer peripheral surface of the other end side of the coil
bobbin 450 in the axial direction. The wound state of the voice coil 500 is fixed by, for example,
an adhesive. The voice coil 500 is wound, for example, in a state in which the diaphragm 400 is
attached to the frame 200 and positioned in the opposing magnetic gap of the lower yoke 222
and the upper yoke 221 of the magnetic body 220. Then, both ends of the wire of the voice coil
500 are drawn out and connected to the terminal 216A of the terminal 216 provided on the
frame 200 to become an input end of audio data.
[0029]
The protective member is formed, for example, in a mesh shape of, for example, a synthetic resin
or a metal material, and is attached to the positioning cylindrical portion 215 of the frame 200 in
a state of covering the expanding side of the diaphragm 400. The attachment of the protective
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member may be, for example, an adhesive or the like, or may be attached by any method such as
fitting fixation or screwing. Further, the speaker device 100 may be configured without the
protective member.
[0030]
(Operation of Speaker Device) Next, as the operation of the speaker device 100, the
characteristics of the diaphragm 400 will be described based on the drawings using various
experimental results. FIG. 4: is explanatory drawing which contrasted the experimental result
which shows the physical property of what from which a foaming state differs, in a table form.
FIG. 5: is explanatory drawing which contrasted the experimental result which shows the physical
property of a thick part and an unfoamed part in a table type.
[0031]
As a papermaking material, microcapsules containing low-boiling hydrocarbons encapsulated in
wood pulp with softwood kraft pulp, fibers appropriately using chemical fibers and inorganic
fibers, and vinylidene chloride copolymer as a foaming agent, and softwood kraft pulp with high
refining A fine fibrous binder was used. The softwood kraft pulp used had a beating degree of
about 700 ml to 750 ml according to Canadian Freeness Standard, which is generally used when
producing the diaphragm 400 by papermaking. Then, water was appropriately added to prepare
a papermaking material in the form of a slurry having a predetermined viscosity, similarly to the
papermaking method using wood pulp in which each material is widely used generally. The
papermaking material was formed into a generally used widely used wood pulp by a paper
making machine (not shown) for forming the above-described substantially elliptical truncated
plate 400, and the papermaking condition was observed. .
[0032]
As a result, in the case of a papermaking material containing no fine fibrous binder, the amount
of the foaming agent in the filtered water is larger than that in the case of using the fine fibrous
binder instead of softwood kraft pulp. It was found that the blowing agent had flowed out of the
net. Then, the amount of the fine fibrous binder was increased, and the amount of the foaming
agent in the filtered water sharply decreased up to 10% by mass, and the reduction of the
amount of the foaming agent became smaller at 20% by mass or more. And, when only softwood
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kraft pulp was used as the fiber material, papermaking could be made up to 50% by mass of the
fine fibrous binder, but when it exceeded 50% by mass, papermaking was clogged and
papermaking could not be made. In addition, when at least a part of softwood kraft pulp is
replaced with chemical fiber or inorganic fiber, papermaking is possible even if the fine fibrous
binder exceeds 50% by mass, and only soft fiber kraft pulp is used and only chemical fiber or
inorganic fiber is used. It was possible to make up to 80% by mass of fine fibrous binder up to
80% by mass. The softwood kraft pulp had a smaller percentage of the foaming agent falling
when it was made of the same amount of softwood kraft pulp and only the chemical fiber and the
inorganic fiber. This is considered to be due to the fact that the proportion of the foaming agent
supported is increased due to the fiber-to-fiber bonding of softwood kraft pulp, that is, the state
in which intertwining of fibers and hydrogen bonding are likely to occur. According to the
experiment of this papermaking process, as the fiber material, 20% by mass or more and 50% by
mass or less in the case of only wood pulp, and in the case of only at least one of chemical fiber
and inorganic fiber, chemical fiber and inorganic fiber In total, 80% by weight or less was found
to be preferable.
[0033]
In addition, as the fine fibrous binder, when the degree of beating is more than 300 ml according
to Canadian Freeness Standard, there is a large difference between the ratio using the softwood
kraft pulp instead of the fine fibrous binder and the proportion of the foaming agent in the
filtered water The amount of blowing agent in the filtrate decreased as the value decreased. In
addition, those having a degree of freeness of less than 50 ml could not be prepared. From this, it
was found that the beating degree of the fine fibrous binder was preferably 50 ml or more and
200 ml or less according to the Canadian Freeness Standard.
[0034]
In the case of changing the particle size of the foaming agent, the amount of the foaming agent in
the filtrate decreased as the particle size increased.
[0035]
Then, after paper making, the die is heated at about 200 ░ C. with a drying apparatus having a
die (not shown) having a clearance corresponding to the shape of the diaphragm 400, and the
formed article after paper making is dried by heating for about 1 minute. The vibrating portion
420 was appropriately foamed to produce the vibrating plate 400.
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Physical properties of the thick portion 421 and the unfoamed portion 422 of the produced
diaphragm 400 were measured.
[0036]
As a result, in those using softwood kraft pulp and chemical fibers or inorganic fibers, those
containing 20% by mass or more of softwood kraft pulp and those containing more than 20% by
mass reduce tensile strength and Young As a result, the characteristics of the diaphragm 400 can
not be obtained. For this reason, when using together chemical fiber or inorganic fiber with
softwood kraft pulp, it has been found that 20 mass% or less is preferable as at least one of
chemical fiber and inorganic fiber.
[0037]
In addition, an increase in the thickness dimension due to foaming was observed from about 1%
by mass of the foaming agent, and there was no significant difference in the expansion ratio even
if it was blended in more than 20% by mass. For this reason, it has been found that the blowing
agent is preferably 1% by mass or more and 20% by mass or less. In addition, when the particle
size of the blowing agent was different, the amount in the filtered water increased as the particle
size decreased. Furthermore, as the particle size increases, the unevenness of the thick portion
421 of the diaphragm 400 after drying increases, and when it exceeds 100 ?m, the amount in
the filtered water decreases but the surface unevenness is large and the appearance is poor.
According to this experiment, it was found that the foaming agent is preferably 100 ?m or less,
particularly 20 ?m or more and 100 ?m or less in consideration of the availability of the
material.
[0038]
Then, as a compounding agent from which the foaming agent is efficiently supported and good
papermaking processing is obtained, a papermaking raw material having 70% by mass of
softwood kraft pulp, 20% by mass of the foaming agent and 10% by mass of the fine fibrous
binder is used. The paper was made into a sheet and dried appropriately to prepare samples
having different expansion ratios, and physical properties were measured. As a comparison, a
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sheet-like sample produced with only wood pulp and prepared with a substantially uniform
thickness dimension was used as a comparative example, and physical properties were similarly
measured. In addition, as a physical property, it is the result of measuring based on JIS-P8118
using a surface thickness meter about surface thickness using a surface thickness meter using a
surface thickness meter. Moreover, about tensile strength, it measured based on JIS-P8113 using
a tensile tester. A part of the result is shown in FIG. The physical properties of the diaphragm
400 having different expansion ratios of the thick portion 421 were also measured. In addition,
what was paper-made only with wood pulp and manufactured the thickness uniformly as
comparison was made into the comparative example as a comparison, and the physical property
was measured similarly. Moreover, as a physical property, it is the result of measuring based on
JIS-P8118 about a paper thickness using a surface thickness meter and using a weight meter
about a density. Furthermore, Young's modulus, internal loss, and sound velocity were measured
by the vibration lead method under the environment of temperature 20 ░ C. and humidity 60%
RH. Some of the results are shown in tabular form in FIG.
[0039]
From the results partially shown in FIG. 4, the density of the thick portion 421 is small and the
tensile strength is high, as compared with the comparative example, in the foamed embodiment.
And the thing of this Embodiment 2 which made the expansion ratio about 20% is a result with
the strongest tensile strength, and it became a tendency for a tensile strength to fall a little as the
expansion ratio became larger than 20%. Incidentally, the reason that the tensile strength was
20% and the expansion ratio was the strongest was the improvement of the rigidity by becoming
thick with a certain degree of expansion and the improvement of the strength by the
entanglement of the fine fibrous binders. Is considered to be the condition that results in the
highest. Thus, it can be seen that by partially providing the thick portion 421, the rigidity of the
vibrating portion 420 is partially improved and the strength is improved.
[0040]
Furthermore, the paper was made into a sheet using the papermaking raw material utilized in the
experimental result shown in FIG. 4 and partially foamed in a partially thickened state using a
mold having a partially different clearance dimension. A sample was prepared, and the physical
properties of the thick portion and the unfoamed portion were measured. The results are shown
in FIG.
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[0041]
From the results shown in FIG. 5, in the thick portion where the thickness is approximately twice
that of the unfoamed portion, the Young's modulus is greatly reduced relative to the unfoamed
portion, and the internal loss tends to be high. Is reduced to about 3/4 at the speed of sound.
[0042]
From the results shown in FIG. 4 and FIG. 5, by partially foaming to provide the thick portion
421, for example, the diaphragm 400 vibrates in a divided vibration, that is, in a partially
different state, or in FIG. It is possible to prevent the vibrating portion 420 from vibrating in a
partially different state or the like which is likely to be generated by the diaphragm 400 or the
like having different diameter dimensions and different rigidity in the radial direction.
For this reason, it vibrates in a partially different state, partially laminates another member to
form a thick, and weight balance becomes uneven, or partially impregnates a synthetic resin and
reinforces it. It is possible to prevent the frequency characteristics from fluctuating due to
frequency by partially foaming the wall. Therefore, it is possible to partially improve the bending
rigidity without increasing the weight, flatten the frequency characteristics, and improve the
frequency characteristics favorably.
[0043]
(Operation and Effect of Speaker Device) As described above, according to the above-described
embodiment, as the diaphragm 400 having the vibrating portion 420 by papermaking using the
papermaking material containing the foaming agent, fine fibrous bonding with the foaming agent
is performed. The material is contained in a papermaking material and papermaking is
performed, and the foaming agent is appropriately foamed and formed so that the vibrating
portion 420 partially becomes thick. For this reason, it is possible to partially foam easily in a
simple manufacturing process by papermaking to partially improve the bending rigidity as a wall
thickness, for example, to stack and reinforce separate seed-like members or soak in synthetic
resin. It is possible to prevent partial weight increase and partially reinforce without
reinforcement. Therefore, it is possible to prevent the frequency characteristics from becoming
flat due to an increase in weight due to reinforcement such as lamination of separate sheet-like
members or impregnation of a rigid resin, etc. Good acoustic characteristics are obtained.
Further, by partially improving the bending rigidity, it is possible to prevent damage such as
breakage or breakage at the time of assembling to the speaker device 100, for example, and the
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handling can be improved to improve the assembling workability, and the output can be
improved. Sufficient strength can be obtained even when used for a relatively large speaker
device 100. Furthermore, by appropriately adjusting the foaming state, the shape of the thick
portion 421, the expansion ratio, etc. can be set appropriately, and the site for increasing the
partial bending rigidity can be set appropriately, so the design freedom is improved. The various
diaphragms 400 can be easily formed, and the versatility can be improved.
[0044]
In addition, the foaming of the thick portion 421 is performed at the time of drying after the
papermaking process. For this reason, the heat quantity at the time of drying can be used
effectively, and it can be made to foam efficiently. In particular, by using a foaming agent that
can be foamed by the amount of heat during drying, foaming can be performed without
separately performing a heat treatment for foaming and the like, and manufacturing efficiency
can be improved.
[0045]
Then, as foaming at the time of drying, a formed product formed by papermaking is mounted in a
gap of a heatable mold of a drying device (not shown), and dried by heating. For this reason, by
using a die of a clearance corresponding to the thickness dimension at the appropriate position
where the flexural rigidity of the diaphragm 400 is to be increased, the thickness of the desired
shape can be obtained without strictly controlling the drying condition. It can be foamed in a
thick part 421, can be easily dried by heating, and can improve manufacturability. In addition, by
using a mold that can appropriately adjust the position of the clearance and the size of the gap,
the expansion ratio and the shape of the thick portion 421 can be appropriately set, and the
diaphragm 400 of various shapes corresponding to desired acoustic characteristics can be
facilitated. It is possible to easily improve the versatility. Furthermore, by the state where the
foamed state is pressed down on the inner surface of the mold, the surface of the thick portion
421 is formed smooth without unevenness like the surface of the mold, and the appearance can
be easily improved.
[0046]
In addition, by foaming the thick portion 421 so as to be thicker than the unfoamed portion 422
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by 1.5 times or less in thickness dimension, rigidity is improved due to the thick and fine fibers
are formed, and fine fibers Sufficient tensile strength can be obtained due to the entanglement of
the rubber binder and the like. For this reason, acoustic characteristics such as a decrease in
flexibility, an increase in weight, an unevenness in weight, and the like due to reinforcement such
as laminating separate sheet-like members as described above or impregnating a synthetic resin
are performed. Can be prevented, and sufficient strength and good acoustic characteristics can
be reliably obtained.
[0047]
And as a fine fibrous binder, the thing with high beatability is used. For this reason, the fibers are
fine and are easily entangled with each other, the carrying ability of the foaming agent is
improved, and even when forming the diaphragm 400 by papermaking, the foaming agent can be
prevented from spilling out from the paper netting, and the thick portion efficiently 421 can be
foamed.
[0048]
In addition, wood pulp materials are used as fine fibrous binders. For this reason, the fiber is
branched and fibrillated into a branched shape by beating to increase the specific surface area,
and a state in which hydrogen bonding is likely to occur by intertwining on the paper network
can be obtained, so that the carrying ability of the foaming agent can be improved. In this case,
the flow of the foaming agent can be prevented, and the thick portion 421 can be efficiently
foamed.
[0049]
Furthermore, as the fine fibrous binder, those having a freeness of 50 ml or more and 200 ml or
less according to Canadian Freeness Standard are used. For this reason, the foaming agent can be
well supported, and even a foaming agent having a fine particle diameter can be easily prevented
from flowing out from the mesh, and the thick portion 421 can be efficiently foamed.
[0050]
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Further, as a papermaking material, a fibrous material to be a base is blended together with a
fine fibrous binder and a foaming agent. For this reason, the increase in filtration resistance at
the time of papermaking can be suppressed by the fine fibrous binder, and papermaking can be
performed without much difference from the case of papermaking using only wood pulp etc. as
the fiber material.
[0051]
And, at least one of wood pulp, chemical fiber and inorganic fiber is used as the fiber material.
For this reason, the material utilized for the diaphragm manufactured by the conventional papermaking can be utilized, and the increase in material cost can be suppressed.
[0052]
In addition, 1% by mass or more and 20% by mass or less of the foaming agent, 1% by mass or
more and 80% by mass or less of the fine fibrous binder, and the remaining portion as the fiber
material are prepared papermaking materials. Therefore, it is possible to effectively foam the
thick portion 421 while suppressing an increase in cost, and it is possible to obtain the
diaphragm 400 with a good foaming efficiency and a good cost-effectiveness.
[0053]
Furthermore, as a fiber material, the papermaking raw material is prepared with 20 mass% or
more, preferably 20 mass% or more and 50 mass% or less of wood pulp. For this reason, it is
possible to easily obtain a state in which the fine fibrous binder is favorably intertwined and
hydrogen bonds are likely to occur, the carrying ability of the foaming agent can be further
improved, and the blending amount of the fine fibrous binder can be reduced. Cost increase can
be further suppressed.
[0054]
Moreover, when using at least any one of chemical fiber and inorganic fiber other than wood
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pulp as a fiber material, these chemical fiber and inorganic fiber are 20 mass% or less. For this
reason, heat resistance, flame resistance, etc. can be achieved by using heat resistant fibers or
inorganic fibers for chemical fibers, for example, without inhibiting the interfiber bonding of
wood pulp, wood pulp and fine fibrous binder. Can be applied to improve versatility.
[0055]
Then, a water repellent synthetic resin is used as a foaming agent, for example, using
microcapsules containing low boiling point hydrocarbon with vinylidene chloride. For this
reason, it is possible to impart water repellency to the diaphragm 400 by the synthetic resin
remaining after foaming, and for example, it can also be used for the diaphragm 400 that is
required to be water resistant such as a speaker device mounted on a car door. Generality can be
improved.
[0056]
Furthermore, as a foaming agent, the particle size is 100 ?m or less, preferably 20 ?m or more
and 100 ?m or less. For this reason, generation | occurrence | production of the surface asperity
of the thick part 421 can be suppressed by foaming, and the fall of an external appearance can
be prevented.
[0057]
[Modification of the embodiment] The present invention is not limited to the above-described
embodiments, and includes the following modifications as long as the object of the present
invention can be achieved.
[0058]
That is, although the cone-shaped diaphragm 400 having a so-called fixed edge has been
described, for example, a so-called free-edge one having a so-called free edge integrated by
joining the edge portion 430 to the vibrating portion 420 But it is applicable.
Furthermore, not only the cone type speaker device 100 but also any type such as a horn type
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can be targeted.
[0059]
Further, although a plurality of rib-shaped thick portions 421 are radially provided along the
radial direction and explained, in a state where the thick portions 421 expand outward on the
outer surface side opposite to the expanding side. It may be formed thick, or may be formed
thickly in a state of bulging on both sides. Further, for example, as in the case of the diaphragm
600 shown in FIG. 6, the rib portion along the longest direction and the shortest direction in the
radial direction is formed into a substantially cruciform thick portion 621 continuous around the
attachment portion 410. The vibration portion 620 may be formed as a non-foamed portion 622.
Further, as in the diaphragm 700 shown in FIG. 7, the thick portion 721 is provided only in a
portion along the direction in which the radial direction is the longitudinal direction, and the
other portion is formed as the non-foamed portion 722. May be Furthermore, as in the
diaphragm 800 shown in FIG. 8, the entire vibrating portion 820 is foamed so as to gradually
become thicker in the radial direction toward the outer peripheral edge side of the vibrating
portion 820 which is easily deformed. Or the like. In addition, although the edge part 830 of the
diaphragm 800 shown in this FIG. 8 is provided in a series in the vibration part 820, it did not
correspond to the thickness of the vibration part 820, but was formed in a series of thickness
dimensions by unfoaming. It is an illustration. Furthermore, as in the diaphragm 900 shown in
FIG. 9, in particular, in order to prevent divided vibration, a thick portion 921 is provided in a rib
shape along the circumferential direction, and the other portion is a non-foamed portion 922. It
may be formed in the portion 920 or the like. In addition, these may be combined suitably, and
what is necessary is just to make it foam so that it may become thick partially.
[0060]
The foaming time is not limited to the time of drying, but may be foamed during papermaking, or
may be foamed after drying. In addition, when foaming during drying, it is not limited to the
configuration using the above-described drying device, and may be dried by any method, without
using the amount of heat during drying, a heating device for foaming such as another heater. You
may use it. In addition, it is preferable that it can be easily shape | molded to a predetermined |
prescribed dimension as mentioned above by making it foam at the time of drying. Furthermore,
the foamed state is not limited to the thickness of 1/2 or more and less than 1 and 1.5 times or
less in mass ratio with respect to the vibrating portion 420.
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[0061]
Further, as a fiber material, a fine fibrous binder may be used. That is, only the fine fibrous
binder and the foaming agent may be used as the papermaking material. According to this
configuration, only two types of raw materials become available, and the raw material
management becomes easy, and only two types of blending of the papermaking raw material are
sufficient and easy, and simplification of the blending equipment can be easily achieved. Further,
as described above, as the fiber material, only wood pulp, only chemical fibers, or only inorganic
fibers may be used appropriately in combination, and any other fibers may be used. .
[0062]
Furthermore, the fine fibrous binder is not limited to wood pulp materials such as wood pulp and
the like, and is not limited to those having high repulpability, and any material capable of
entangled fibers and capable of supporting a foaming agent can be used. And the degree of
beating is not limited to 50 ml or more and 200 ml or less in the Canadian Freeness Standard.
[0063]
Further, the papermaking raw material is not limited to the various blending proportions
described above, and can be appropriately set according to desired acoustic characteristics,
application fields and the like.
[0064]
And although the mounting support part 460 was provided and demonstrated to the coil bobbin
450 attached to the diaphragm 400, it is good also as a structure which provided the mounting
support part 460 as a series as the diaphragm 400. FIG.
Furthermore, the coil bobbin 450 may not be provided. For example, the voice coil 500 may be
directly wound around a portion formed in a substantially cylindrical shape by being bent in
series from the vibrating portion 420. In addition, although the vibrating portion 420 is formed
to have a substantially elliptical truncated shape, it is also possible to use one formed to have a
substantially circular truncated shape having substantially the same diameter size.
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[0065]
Furthermore, the configuration of the frame 200 is not limited to the above-described structure
in which the main body portion 210 and the magnetic body 220 described above are provided
and are spread over one side. For example, any shape may be used, such as a substantially
cylindrical shape used in the case of a small size used for a portable device such as a mobile
phone or a notebook computer. Furthermore, as the magnetic body 220, any shape that
constitutes any magnetic circuit, such as an internal magnet type or an external magnet type, can
be applied.
[0066]
Moreover, although the protective member was provided and demonstrated, it is not necessary to
provide a protective member as mentioned above.
[0067]
In addition, the specific structure and procedure at the time of implementation of this invention
can be suitably changed into another structure etc. in the range which can achieve the objective
of this invention.
[0068]
[Operation and Effect of the Embodiment] As described above, as the diaphragm 400 containing
the foaming agent and having the vibrating portion 420 by papermaking, the fine fibrous binder
is contained together with the foaming agent to make the paper, and the vibrating portion 420
The foaming agent is suitably foamed in a partially thickened state.
For this reason, without reinforcing such as laminating another sheet-like member or soaking
synthetic resin, it is possible to prevent an increase in weight and to partially reinforce in a
uniform weight state, and the frequency characteristic is flat. Good acoustic characteristics can
be obtained.
[0069]
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FIG. 1 is a cross-sectional view showing a speaker device according to an embodiment of the
present invention.
It is sectional drawing which notched one part which shows the diaphragm in the said
embodiment. It is the top view which notched one part which shows typically the vibration part
of the diaphragm in the said embodiment. It is explanatory drawing which contrasted the
experimental result which shows the physical property of what differs in the foaming state in the
said embodiment in a table form. It is explanatory drawing which contrasted the experimental
result which shows the physical property of the thick part in the said embodiment, and an
unfoamed part in a table type. It is the top view which notched one part which shows typically
the diaphragm in other embodiment of this invention. It is the top view which notched one part
which shows typically the diaphragm in further another embodiment of this invention. It is
sectional drawing which notched the part in which the diaphragm in the further another
embodiment of this invention is shown typically. It is sectional drawing which notched the part in
which the diaphragm in the further another embodiment of this invention is shown typically.
Explanation of sign
[0070]
DESCRIPTION OF SYMBOLS 100 ... Speaker apparatus 200 ... Frame 220 ... Magnetic body 300
which is a yoke 300 ... Magnet 400, 600, 700, 800, 900 ... Diaphragm 420, 620, 720, 820, 920
... Vibration part 421, 621, 721 , 921 иии Thick portions 422, 622, 722, 922 иии Foamed portions
Non-foamed portions 430, 830 иии Edge portions 500 иии Voice coil
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