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JPH09294298

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DESCRIPTION JPH09294298
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of forming a speaker member in which an edge is integrally formed on the outer
peripheral edge of a speaker diaphragm.
[0002]
2. Description of the Related Art In order to improve the acoustic characteristics of the edge
formed on the outer peripheral edge of a speaker diaphragm, the vibration of the speaker
diaphragm is suppressed or the edge itself does not generate abnormal vibration such as
resonance. There is also a need for various properties such as having the internal losses
necessary to sufficiently dampen the extra vibration of the loudspeaker diaphragm.
Conventionally, in order to meet the above-mentioned demand, for example, various edges made
of the following materials have been developed. That is, a fiber type made by impregnating a
woven or non-woven fabric of natural fibers or synthetic fibers with a thermosetting resin, heatpressing and forming it, and applying a dumping agent (damping agent) to this, about 30 times A
urethane compression type finished by impregnating foamed urethane foam with bitumen, heat
pressed and finished, and a rubber type finished by molding using a rubber compound
containing a vulcanizing agent with a predetermined molding die can give.
[0003]
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However, when the above-mentioned edge is formed on the outer peripheral edge of the speaker
diaphragm, there are the following disadvantages. That is, the speaker diaphragm and the edge
are separately molded, a primer (primer) and an adhesive are applied to each molded product,
these are joined via the adhesive, and finally the adhesive is dried, etc. A process is required. As a
result, the number of manufacturing steps is increased and the operation becomes complicated,
and since it takes time for manufacturing, mass production becomes difficult, resulting in a
problem of an increase in manufacturing cost.
[0004]
The present invention has been made in view of such circumstances, and it is a simple method of
forming a member for a speaker, which requires no adhesive and the like, shortens the
manufacturing process, can be mass-produced, and can reduce the manufacturing cost. The
purpose is to provide.
[0005]
[Means for Solving the Problems] In order to achieve the above object, according to a method of
molding a speaker member of the present invention, the following viscous rubber mixture (X) is
formed on the outer peripheral portion of the speaker diaphragm in a mold. Position, and after
clamping the mold in that state, the viscous rubber mixture (X) is vulcanized and foamed and
compressed with the mold to form the viscous rubber mixture on the outer peripheral edge of
the speaker diaphragm. An edge formed of the following viscoelastic foam (Y) which is a
vulcanized foam of (X) is integrally formed.
(X) A viscous rubber blend containing the following components (A) to (D). (B) Softener. (C)
Organic blowing agent. (D) Vulcanizing agent. (Y) A visco-elastic foam in which the tensile
strength is set in the range of 0.1 to 100 kg / cm 2 and the specific gravity is set in the range of
0.07 to 1.2.
[0006]
That is, in the method for molding a speaker member according to the present invention, the
viscous rubber mixture (X) is positioned at the outer peripheral edge of the speaker diaphragm in
a mold, and after clamping in that state, the viscous rubber mixture It is carried out by
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2
vulcanizing and foaming the substance (X) and compressing it with the above-mentioned mold.
Therefore, the viscous rubber mixture (X) which has been melted by heat is compressed by the
mold and flows on the speaker diaphragm, and the viscous rubber mixture (in the outer
peripheral portion of the speaker diaphragm) ( An edge composed of the visco-elastic foam (Y)
which is a vulcanized foam of X) can be integrally formed. Therefore, the conventional adhesive
and the like become unnecessary, the manufacturing process is shortened, and mass production
becomes possible, so that the manufacturing cost can be largely reduced.
[0007]
In addition, as the viscoelastic foam (Y) used in the present invention, a viscous rubber mixture
(X) containing the above-mentioned components (A) to (D) is added to a specific tensile strength
and a specific gravity. It is obtained by vulcanization foaming. For this reason, the foam matrix
constituting the edge is formed of an integrated structure of the rubber component (component
A) and the softener component (component B), and the foam matrix has high strength and is a
flexible elastic body. It is also. Furthermore, there is little change in physical properties due to
environmental conditions such as the outside air temperature. And since it is a foam, although
the visco-elastic foam (Y) which consists of said viscous rubber compound (X) is a rubber type, its
specific gravity is small and lightweight. From these things, when the said viscoelastic foam (Y) is
used, the outstanding acoustic characteristic can be exhibited.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will
now be described in detail.
[0009]
The viscous rubber mixture (X) used in the method for forming a speaker member according to
the present invention comprises a rubber (component A), a softener (component B), an organic
foaming agent (component C), and a vulcanizing agent (D). The visco-elastic foam (Y) is obtained
by vulcanizing and foaming this special viscous rubber mixture (X).
[0010]
As said rubber | gum (component A), synthetic rubbers, such as a styrene butadiene rubber
(SBR), a nitrile butadiene rubber (NBR), ethylene-propylene terpolymer rubber (EPT), are mention
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| raise | lifted as a typical thing.
Further, in addition to the above synthetic rubbers, synthetic rubbers such as isoprene rubber
(IR), chloroprene rubber (CR), isobutylene-isoprene rubber (IIR), ethylene-propylene rubber
(EPR), silicone rubber and the like can be mentioned.
These may be used alone or in combination of two or more. It is particularly preferable to use
SBR in terms of formability. Furthermore, when using two or more types together, it is using NBR
and EPT together from durability points, such as a weather resistance.
[0011]
As a softener (component B) to be used together with the component A, plasticizers having a
molecular weight of 300 to 500 such as dioctyl phthalate and dibutyl phthalate, polymer
plasticizers having a molecular weight of 1000 to 8000 such as a polyester plasticizer, spindle
Oils, machine oils, lubricating oils such as cylinder oils, process oils such as paraffinic process
oils, naphthenic process oils, petroleum softeners such as liquid paraffin, paraffins such as
vaseline, coal tar, coal tar pitch, etc. Coal tar softeners, aliphatic softeners such as castor oil and
cottonseed oil, waxes such as beeswax and lanolin, resins which are liquid or solid at normal
temperature, and liquid rubbers such as polybutene. These are used alone or in combination of
two or more because of their compatibility with the respective rubbers. It is particularly
preferable to use, for example, a naphthene-based process oil when using an SBR-based rubber.
Furthermore, when using NBR-based rubber and EPT-based rubber in combination, for example,
paraffin-based process oil, dioctyl phthalate (DOP) is used from the viewpoint of compatibility.
The blending ratio of the above-mentioned softener (component B) is preferably set in the range
of 3 to 110 parts with respect to 100 parts by weight (hereinafter abbreviated as "parts") of the
rubber (component A), more preferably 5 The amount is 80 to 80 parts, particularly preferably
20 to 60 parts. That is, if the blending ratio of the softener is less than 3 parts, the flexibility is
poor, and conversely, if it exceeds 110 parts, bleeding tends to occur on the surface.
[0012]
Examples of organic foaming agents (component C) used together with the above components A
and B include nitroso compounds such as N, N'-dinitrosopentamethylenetetramine, N, N'dimethyl-N, N'-dinitrosotephthalamide, etc. And azo compounds such as azodicarbosoamide,
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azobisisobutyl nitrile and diazoaminobenzene; and sulfonyl hydrazide compounds such as
benzene sulfonyl hydrazide and toluene sulfonyl hydrazide. In addition, known foaming agents
such as p-toluenesulfonyl azide, 4,4'-diphenylsulfonyl azide, 4,4'-oxybisbenzososulfonyl
hydrazide and the like can also be mentioned. These may be used alone or in combination of two
or more. It is particularly preferable to use, for example, azodicarboamide from the viewpoint of
heating and temperature-related gas generation. Furthermore, when using 2 or more types
together, it is using azo dicarboamide and 4,4'- oxybis benzoso sulfonyl hydrazide together from
a point of adjustment of foaming decomposition temperature. And it is preferable to set the
compounding ratio of the said organic foaming agent (component C) in the range of 0.1 to 35
parts with respect to 100 parts of rubber (component A), more preferably 1 to 30 parts,
especially preferable Is 5 to 20 parts. That is, if the blending ratio of the organic blowing agent is
less than 0.1 part, the foaming becomes insufficient, and conversely, if it exceeds 35 parts,
outgassing tends to occur.
[0013]
Examples of the vulcanizing agent (component D) used together with the components A to C
include sulfur, sulfur compounds such as sulfur chloride and sulfur dichloride, oximes such as pquinone dioxime, and carbamates such as hexadiamine carbamate and ethylene diamine
carbamate And other selenium, lithium surge, etc. These may be used alone or in combination of
two or more. Particularly preferred is, for example, the use of sulfur from the viewpoint of rapid
vulcanization by molding. Furthermore, the combination in the case of using 2 or more types
together is using together sulfur and p-quinone dioxime. And it is preferable to set the
compounding ratio of the said vulcanizing agent (component D) in the range of 0.01-10 parts
with respect to 100 parts of rubber | gum (A component), Especially preferably, it is 1-3 parts.
That is, if the compounding ratio of the vulcanizing agent is less than 0.01 part, the vulcanization
becomes insufficient, and conversely, if it exceeds 10 parts, the rubber elasticity tends to become
strong.
[0014]
In the above-mentioned viscous rubber mixture (X) used in the present invention, a filler, a
rubber reinforcing agent, a vulcanization accelerator, and a vulcanizing agent which are other
additives as needed in addition to the above-mentioned components A to D A promoter auxiliary,
an ultraviolet absorber, an antiaging agent, a foaming auxiliary and the like can be appropriately
blended.
[0015]
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Examples of the filler include inorganic fillers such as calcium carbonate, talc, clay, asbestos,
pumice powder, glass fibers, mica, silica, hollow beads and the like.
In addition, organic fillers such as recycled rubber, shellac, wood powder, cork powder and the
like can be mentioned. These may be used alone or in combination of two or more. Particularly in
these fillers, in order to carry out molding foaming uniformly, those having uniform viscosity and
good dispersibility are preferable. And, from the viewpoint of weight reduction of the speaker
member, it is preferable to use, for example, talc and silica.
[0016]
Examples of the rubber reinforcing agent include carbon black such as channel black and furnace
black, and silicas. These may be used alone or in combination of two or more.
[0017]
Examples of the vulcanization accelerator include guanidine compounds such as
diphenylguanidine and triphenylguanidine, thiazole compounds such as 2-mercaptobenzothiazole
and dibenzothiazole disulfide, thiourea compounds such as thiocarbanilide and diethylthiourea,
tetramethylthiuram monosulfide And thiuram compounds such as tetramethylthiuram disulfide;
and dithiocarbamate compounds such as zinc dimethyldithiocarbamate and sodium
dimethyldithiocarbamate. These may be used alone or in combination of two or more.
[0018]
Examples of the above-mentioned vulcanization acceleration auxiliary include metal oxides such
as zinc oxide and magnesium oxide, fatty acids such as stearic acid and oleic acid and derivatives
thereof, cyclohexylamines, dicyclohexylamines and the like. These may be used alone or in
combination of two or more.
[0019]
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Examples of the ultraviolet absorber include benzophenone compounds and benzotriazole
compounds.
[0020]
Examples of the antiaging agent include phenol compounds, amine ketone compounds, and
aromatic amine compounds.
[0021]
Examples of the foaming aid include salicylic acid and urea.
[0022]
The blending ratio of the other additives is 10 to 200 parts of the filler, 10 to 100 parts of the
rubber reinforcing agent, and 0.1 to 20 parts of the vulcanization accelerator with respect to 100
parts of the rubber (component A). Set the vulcanization acceleration aid to 0.1 to 10 parts, the
ultraviolet absorber to 0.1 to 10 parts, the anti-aging agent to 0.1 to 10 parts, and the foaming
aid to 0.1 to 30 parts. Is preferred.
[0023]
The viscous rubber blend (X) used in the present invention is produced, for example, as follows.
That is, they are prepared by appropriately blending and kneading the components A to D and
other additives as needed.
And, the viscous rubber mixture (X) produced in this manner is that the Mooney viscosity [ML (1
+ 4) 100 ° C.] is set in the range of 1 to 30, using the visco-elastic property. When producing a
foam (Y), it is preferable, and especially preferably the Mooney viscosity is 2-15.
[0024]
In blending the above-mentioned viscous rubber blend (X), the preferred combination of blending
is SBR-based rubber as component A, naphthene-based process oil as component B,
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azodicarbosol as component C from the viewpoint of short-term molding vulcanization foaming.
Acid, a combination using sulfur as the D component.
Furthermore, in addition to the above-mentioned essential components A to D, as other additives,
zinc flower, stearic acid, talc as a filler, carbon black as a reinforcing agent, tetramethylthiuram
disulfide as a vulcanization accelerator, foaming It is particularly preferable to use urea as an
agent, 2,4-bis [(octylthio) methyl] -o-cresol as an anti-aging agent, and a
hydroxyphenylbenzotriazole derivative as an ultraviolet absorber.
The combination of such a compounding makes it possible to obtain one excellent in molded
vulcanized foam having a Mooney viscosity of 2 to 15.
[0025]
Next, the method for forming a speaker member of the present invention will be specifically
described based on the drawings. That is, first, the viscous rubber mixture (X) is formed into a
sheet (1 to 10 mm in thickness) or a film (0.1 to 1 mm in thickness). Next, as shown in FIG. 1, the
viscous rubber mixed with the speaker diaphragm 2 such as cone paper and the like and located
on the outer peripheral edge portion of the speaker diaphragm 2 in the molding die 1 having a
predetermined shape prepared in advance. Load with object (X) and clamp. Then, the viscous
rubber mixture (X) is vulcanized and foamed by setting appropriate heating and pressurizing
conditions, and is compressed in the arrow direction by the mold 1. Therefore, the viscous rubber
mixture (X) which has been melted by heat is compressed by the mold 1 and flows on the
speaker diaphragm 2, as shown in FIG. 2, the outside of the speaker diaphragm 2 as shown in
FIG. The edge 3 which consists of a visco-elastic foam (Y) which has a structure | tissue which the
rubber component of the said viscous rubber compound (X) and the softener component
integrated may be integrally formed in a peripheral part. Alternatively, the above-mentioned
viscous rubber mixture (X) may be punched into a sheet or film and then placed in a molding die
1 of a predetermined shape and vulcanized and foamed in the same manner as above, or The
viscous rubber mixture (X) may be put as it is into a molding die 1 having a predetermined shape
and vulcanized and foamed in the same manner as described above.
[0026]
The viscous rubber mixture (X) is positioned in advance at the outer peripheral edge of the
speaker diaphragm, loaded in the mold in this state, clamped, and vulcanized and foamed in the
same manner as above. It is also good.
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[0027]
The heating and pressurizing conditions are appropriately set according to the types and
blending proportions of the components constituting the viscous rubber mixture (X), and the
heating and pressurizing conditions are, for example, 0 at a temperature of 80 to 250 ° C. and a
pressure of 1 to 10 kg / cm 2. It is preferable to set so as to obtain a heat capacity of .02 to 30
minutes.
Particularly preferably, the heat capacity is set to a temperature of 150 to 200 DEG C. and a
pressure of 4 to 6 kg / cm @ 2 for 0.5 to 10 minutes.
[0028]
Moreover, in the heat foaming of the viscous rubber mixture (X), it is preferable to heat foam so
that the expansion ratio after foaming is 1.05 to 30 times, from the relationship with the volume
of the molding die, more preferably Is 1.1 to 15 times, particularly preferably 1.5 to 7 times. It is
preferable from the viewpoint of the characteristics (acoustic characteristics etc.) of the member
for a speaker that the viscous rubber mixture (X) is filled in a molding die and heated so as to
obtain such a foaming ratio, and then foamed and vulcanized.
[0029]
Furthermore, in the obtained viscoelastic foam (Y), the composition of the viscous rubber mixture
(X) as the forming material and the foaming and vulcanization conditions by heat and pressure
are appropriately set, and the material loss coefficient is 0. It is preferable to set to 001 or more,
and particularly preferably 0.01 or more. By setting the substance loss coefficient in such a
range, the acoustic characteristics are significantly improved, and a speaker member which
transmits the vibration of the speaker with high sensitivity can be obtained.
[0030]
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The substance loss coefficient is defined as follows. Material loss coefficient (tan δ) = (E2) / (E1)
E1: storage modulus E2: loss modulus
[0031]
The resulting viscoelastic foam (Y) must have a tensile strength of 0.1 to 100 kg / cm @ 2.
Particularly preferably, it is 5 to 20 kg / cm 2. That is, if the tensile strength is less than 0.1 kg /
cm 2, the strength may be insufficient and breakage may occur. Conversely, if it exceeds 100 kg
/ cm 2, the strength is too strong to cause vibration. Furthermore, the specific gravity of the
viscoelastic foam (Y) used in the present invention must be set in the range of 0.07 to 1.2.
Particularly preferably, it is 0.3 to 0.8. That is, if the specific gravity is less than 0.07, destruction
occurs at high sound pressure, and if it exceeds 1.2, the speaker member becomes too heavy and
the edge does not vibrate smoothly with respect to the sound pressure.
[0032]
Next, an example will be described together with a comparative example.
[0033]
Examples 1 to 9 and Comparative Examples 1 and 2 A viscous rubber mixture was prepared by
blending the components shown in Tables 1 and 2 below in the proportions shown in the same
Table.
Then, this viscous rubber mixture was formed into a sheet having a thickness of 2 mm. Then, the
viscous rubber mixture molded into the sheet shape and the speaker diaphragm were put into
the above-mentioned molding die and clamped. Next, the viscous rubber mixture is foamed and
vulcanized under heating conditions of 200 ° C. for 1 minute, and is compressed with the mold,
and the viscosity of the viscous rubber mixture is applied to the outer peripheral portion of the
speaker diaphragm. An edge made of an elastic foam was integrally formed. As the speaker
diaphragm, cone paper (tan δ = 0.04) with a specific gravity of 0.65 was used.
[0034]
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The physical properties [tensile strength, specific gravity, foaming ratio, and material loss
coefficient] of the edge of the example product and the comparative product thus obtained were
measured according to the following method. The results are shown in Tables 3 and 4 below.
[0035]
[Tensile strength] Measured according to the rubber tensile strength test method of JIS K 6301.
[0036]
[Specific gravity] It was measured according to JIS K 6767.
[0037]
[Expansion ratio] It was calculated by the inverse calculation method from the above specific
gravity.
[0038]
[Material loss coefficient] Measured by a method using a dynamic viscoelasticity measuring
apparatus (frequency 1 Hz).
In addition, the measurement integrated and measured the integrally molded article of the
speaker diaphragm (corn paper) and edge which were obtained above to the speaker.
[0039]
Then, the integrally formed product (the product of Example 1) of the speaker diaphragm (corn
paper) and the edge (specific gravity 0.4) obtained above is incorporated into the speaker, and
the loss coefficient tan δ is 0.50. The acoustic characteristics of were measured.
Also, the acoustic characteristics were measured in the case where the product of Comparative
Example 1 was used instead of the product of Example 1 above.
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The results are shown in FIG. In the figure, the curve X shows the acoustic characteristic of the
speaker using the product of Example 1 and the curve Y shows the acoustic characteristic of the
speaker using the product of Comparative Example 1. The measurement of the said acoustic
characteristic according to frequency was performed by the sound pressure response. As a result,
due to the weight reduction by foaming and the characteristics of rubber elasticity, distortion in a
high frequency region was small, and good acoustic characteristics were obtained even in a low
frequency region. As a result of measuring in the same manner in the other example products,
substantially similar, that is, good acoustic characteristics were obtained. On the other hand, it is
apparent from FIG. 3 that the product of Comparative Example 1 is a rubber solid that does not
foam, has a large specific gravity, and has a large strain as compared with the product of the
example. For the other comparative examples, the expansion ratio is small, and almost solid
characteristics are exhibited.
[0040]
As described above, it can be seen that each example product having a small specific gravity edge
obtained by vulcanization foaming based on a rubber component can be reduced in weight and is
superior to the conventional edge in terms of acoustic characteristics. . Furthermore, each
example product is hardly affected by the outside air temperature, and the sound quality and the
like are not deteriorated. And, as a result of using each example product for accelerated
weathering test (500 hours) with a sunshine weather meter (500 hours) and deterioration test of
edge material by warm water immersion (168 hours), there is almost no change and weather
resistance and water resistance It turns out that it is excellent.
[0041]
As described above, according to the method of molding a speaker member of the present
invention, the viscous rubber mixture (X) is positioned at the outer peripheral edge of the
speaker diaphragm in the mold, and the mold is in that state After tightening, the viscous rubber
mixture (X) is vulcanized and foamed and compressed by the mold. Therefore, the viscous rubber
mixture (X) which has been melted by heat is compressed by the mold and flows on the speaker
diaphragm, and the viscous rubber mixture (in the outer peripheral portion of the speaker
diaphragm) ( An edge composed of the visco-elastic foam (Y) which is a vulcanized foam of X)
can be integrally formed. Therefore, according to the present invention, a conventional adhesive
and the like are not required, the manufacturing process is shortened, and mass production
becomes possible, so that the manufacturing cost can be largely reduced.
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[0042]
In addition, as the viscoelastic foam (Y) used in the present invention, a viscous rubber mixture
(X) containing the above-mentioned components (A) to (D) is added to a specific tensile strength
and a specific gravity. It is obtained by vulcanization foaming. For this reason, the foam matrix
constituting the edge is formed of an integrated structure of the rubber component (component
A) and the softener component (component B), and the foam matrix has high strength and is a
flexible elastic body. It is also. Furthermore, there is little change in physical properties due to the
influence of environmental conditions such as the outside air temperature. And since it is a foam,
although the visco-elastic foam (Y) which consists of said viscous rubber compound (X) is a
rubber type, its specific gravity is small and lightweight. From these things, when the said
viscoelastic foam (Y) is used, the outstanding acoustic characteristic can be exhibited.
[0043]
Brief description of the drawings
[0044]
1 is an explanatory view showing an example of a method of forming a speaker member of the
present invention.
[0045]
2 is an explanatory view showing an example of a method of forming a speaker member of the
present invention.
[0046]
3 is a curve diagram showing the acoustic characteristics by the speaker manufactured by
incorporating an integrally molded product (Example 1 and Comparative Example 1) of the
speaker diaphragm (corn paper) and the edge.
[0047]
Explanation of sign
[0048]
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1 Mold 2 Speaker diaphragm 3 Edge made of visco-elastic foam (Y)
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