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JP2000197187

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DESCRIPTION JP2000197187
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
techniques for combining vibration system components in a loudspeaker. The invention is mainly
suitable for cone type loudspeakers, but it is not limited to such, but shall be applied to any type
of loudspeaker.
[0002]
2. Description of the Related Art FIG. 8 (a) is a front view of a loudspeaker according to the prior
art, FIG. 8 (b) is a side view of its half section, and FIG. 9 is a detailed sectional view of the half
section of FIG. It is. In these figures, 1 is a voice coil, 2 is a bobbin, 3 is a damper, 4 is a coneshaped diaphragm (cone paper), 5 is an edge, 6 is a center cap, 7 is a frame, 8 is a pole piece, 9 is
a magnet and 10 is a solvent-based two-component adhesive. The bobbin 2, the damper 3, the
diaphragm 4, the edge 5, the center cap 6, etc. are "vibration system components". The inner
peripheral edge 3a of the damper 3 is fitted on the outer peripheral surface 2b of the cylindrical
bobbin 2 in which the voice coil 1 is wound around the inner peripheral surface 2a. The agent 10
is poured, and the damper 3 is fixed to the bobbin 2 by drying of the adhesive. Further, the inner
peripheral edge portion 4a of the diaphragm 4 is fitted on the outer end side of the outer end
side outer peripheral surface 2b of the bobbin 2 and the solvent-based two-component adhesive
10 is poured into the joint portion of both. The diaphragm 4 is fixed to the bobbin 2 by drying.
The solvent-based two-component adhesive 10 mixes the two solutions of the solution A and the
solution B at the time of use, and exerts strong adhesion and curability by a chemical reaction.
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1
[0003]
SUMMARY OF THE INVENTION The above-mentioned prior art has the following problems.
Although the solvent-based two-component adhesive 10 is used for the connection of vibration
system components such as the connection between the bobbin 2 and the damper 3 and the
connection between the bobbin 2 and the diaphragm 4, the solvent-based two-component
adhesive 10 is used The control of the adhesive strength is performed by adjusting the respective
application amounts of the liquid A and the liquid B and adjusting the blending ratio of the liquid
A and the liquid B. However, the coating amount and the compounding ratio are likely to vary,
making it difficult to control adhesion. In addition, since the time required for curing of the
solvent-based two-component adhesive in the assembly process is considerable and the time is
uneven, it is difficult to control the assembly process itself. As a result, the bond quality is
associated with instability. The handleability and workability of solvent-based two-component
adhesives are also problems. Furthermore, solvent-based two-component adhesives must
consider environmental hygiene such as ventilation in order to volatilize harmful components.
[0004]
The present invention aims to solve the problems described above.
[0005]
The speaker according to claim 1 of the present invention is characterized in that a plurality of
vibration system components such as a bobbin, a diaphragm and a damper as elements
constituting a vibration system in the speaker are double-sided adhesive tapes. Also, they are
bonded together by adhesion through an acrylic double-sided adhesive tape.
According to this configuration, there are the following effects. That is, as a mediator for bonding
between vibration system components, it has a strong holding power, has a characteristic that
the adhesion increases with the passage of time, is excellent in heat resistance, Since an acrylic
double-sided adhesive tape having resistance to oxygen is used, the adhesive strength as a whole
is high and uniform, the adhesive quality is high, and the stability is also good. In addition, it is
necessary to carry out troublesome work such as control of the adhesive strength and flow
control by adjusting each application amount of the liquid A and the liquid B and adjusting the
compounding ratio of both liquid In comparison with solvent-based two-component adhesives in
the case of the prior art, such as time-consuming, uneven time, and instability in adhesion quality
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2
and further containing harmful components, It does not require any special attention, it can be a
simple paste and press work, it does not have to wait for curing time, it can be assembled in a
short time, the overall workability is significantly To be improved. Furthermore, because it
contains no harmful ingredients, there are no problems with environmental health. In addition,
the acrylic double-sided adhesive tape is lighter than the solvent-based two-component adhesive,
and the high-frequency characteristics in sound radiation are improved.
[0006]
In the speaker according to claim 2 of the present invention, the inner peripheral edge portion of
the diaphragm and the inner peripheral edge portion of the damper are bonded to the outer
peripheral surface of the bobbin around which the voice coil is wound through an acrylic doublesided adhesive tape. The configuration is According to this configuration, as described in claim 1,
the diaphragm and the damper as the vibration system component with respect to the bobbin as
the vibration system component have high adhesion quality under strong and uniform adhesion.
And it is joined under good adhesion stability, and a good speaker with high frequency
characteristics that is harmless, excellent in environmental health, and excellent in workability
both in time and work is realized.
[0007]
In the loudspeaker according to claim 3 of the present invention, the direction of protrusion of
the inner peripheral edge portions of the diaphragm and the damper is opposite to the direction
of fitting to the bobbin. The edge (sharp edge) of the end of the cylindrical inner peripheral edge
in the diaphragm or damper is fitted when the inner peripheral edge is fitted in the axial
direction to the acrylic double-sided adhesive tape on the bobbin Since it is made to project in the
direction opposite to the direction, its edge (sharp edge) is less likely to stick to the acrylic
double-sided adhesive tape and receive resistance against insertion, and the insertion becomes
smooth, so the work of insertion Improves the quality.
[0008]
In the speaker according to the fourth aspect of the present invention, in addition to the abovedescribed constructions, the outer peripheral portion of the damper and the inner surface of the
frame are also connected via the acrylic double-sided adhesive tape. Further, in the speaker
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according to the fifth aspect of the present invention, in addition to the above-described
configurations, the acrylic double-sided surface also in the connection between the outer
peripheral portion of the edge as a vibration system component connected to the outer
peripheral portion of the diaphragm and the outer peripheral flange of the frame. Bonding
through an adhesive tape. In either case, the workability is improved as compared with the case
of fixing using a solvent-based two-component adhesive.
[0009]
The speaker according to claim 6 of the present invention adopts, as an acrylic double-sided
adhesive tape, one in which an acrylic pressure-sensitive adhesive layer is formed on both the
front and back sides of a relatively thick foamed acrylic foam substrate. The acrylic foam base
material exhibits excellent flexibility and excellent vibration absorption, effectively preventing the
generation of stagnant noise between the bobbin and the damper and between the bobbin and
the diaphragm, and providing acoustic characteristics. Be good.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a speaker according to the
present invention will be described in detail below based on the drawings. In the following
embodiments, a cone type speaker will be taken as an example.
[0011]
Embodiment 1 FIG. 2 (a) is a front view of a speaker according to Embodiment 1, FIG. 2 (b) is a
side view of its half section, and FIG. 1 is a detailed view of a half section of FIG. 2 (b). FIG. As
shown in these figures, the voice coil 1 is wound around the inner end side outer peripheral
surface 2a of a cylindrical bobbin 2 as a vibration system component of the speaker, and is fixed
by heat treatment. An acrylic double-sided adhesive tape 11 indicated by a thick black line is
wound around the outer end side outer peripheral surface 2 b of the bobbin 2. The range of the
winding is a dimension sufficient for adhesively bonding the inner peripheral edge 3 a of the
damper 3 and the inner peripheral edge 4 a of the diaphragm 4. The cylindrical inner peripheral
edge portion 4a of the cone-shaped diaphragm (corn paper) 4 as a vibration system component
is fitted into the acrylic double-sided adhesive tape 11 attached by winding around the bobbin 2,
and the adhesive force is reduced by pressure. The diaphragm inner peripheral edge 4 a is
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4
coupled to the bobbin 2 through the acrylic double-sided adhesive tape 11. Further, the
cylindrical inner peripheral edge portion 3a of the damper 3 as a vibration system component is
fitted into the same acrylic double-sided adhesive tape 11, and the adhesive force is expressed by
the pressure, and the damper inner circumferential edge via the acrylic double-sided adhesive
tape 11 The portion 3 a is coupled to the bobbin 2. The inner peripheral edge portions 3 a and 4
a of the damper 3 and the diaphragm 4 are respectively protruded in the same direction as the
fitting direction X with respect to the bobbin 2. In FIG. 1 and FIG. 2, reference numeral 5 denotes
an edge connected to the outer peripheral edge of the diaphragm 4, 6 denotes a center cap
covering the opening of the inner peripheral edge of the diaphragm 4, 7 denotes a metal frame
as an outer shell, 8 denotes A pole piece as a guide for the piston movement of the bobbin 2 and
a magnet (permanent magnet) 9 that forms a magnetic field with respect to the current flowing
through the voice coil 1. The bobbin 2, the damper 3, the diaphragm 4, the edge 5, the center cap
6, etc. are vibration system components.
[0012]
FIG. 3 shows the cross-sectional structure of the acrylic double-sided adhesive tape 11 described
above. The acrylic double-sided adhesive tape 11 is obtained by forming acrylic adhesive layers
11b and 11b having strong adhesive force on both surfaces of the front and back of the acrylic
foam substrate 11a subjected to the foaming treatment. The acrylic foam substrate 11a has a
large thickness and a foam structure as compared to the acrylic adhesive layer 11b, and thus has
excellent flexibility and excellent vibration absorption for absorbing speaker vibrations. The
acrylic double-sided adhesive tape 11 has a function to effectively prevent the generation of
stagnant noise between the bobbin 2 and the damper 3 and between the bobbin 2 and the
diaphragm 4. The acrylic double-sided adhesive tape 11 has a strong holding power, an adhesive
strength that increases with time, has excellent heat resistance, and is sufficiently resistant to
light and oxygen. In the speaker of this embodiment in which the bobbin 2 is connected to the
damper 3 and the diaphragm 4 using the acrylic double-sided adhesive tape 11, the adhesive
strength is high as a whole, the adhesive quality is high, and the stability is also good. ing. In
double-sided adhesive tapes other than acrylics, deterioration, softening, embrittlement, etc. are
easily progressed by vibration, impact, temperature, humidity, light, oxygen, etc., and the
decrease in adhesion with age is large.
[0013]
In the case of a solvent-based two-component adhesive in which adhesion and curing properties
are exhibited by the chemical reaction between two components A and B in the prior art,
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adjustment of the respective application amounts of components A and B and components A and
B It is troublesome to control the adhesive strength by adjusting the compounding ratio, and it
takes considerable time for curing, and moreover, the time is uneven and the adhesion quality is
accompanied by instability. On the other hand, in the case of the acrylic double-sided adhesive
tape 11 in the present embodiment, no particular care is required for such adhesive
management. In the case of the acrylic double-sided adhesive tape 11, it is not necessary to take
time for curing as in the case of the solvent-based two-component adhesive, and the assembly
can be performed in a short time. By the above synergy, the workability will be greatly improved.
However, as described above, since the adhesion is strong and uniform over the entire
circumference, the adhesion quality is high and the stability is excellent. In addition, unlike the
solvent-based two-component adhesive containing a harmful component, the acrylic double-sided
adhesive tape has no problem in environmental hygiene. In addition, since the acrylic doublesided adhesive tape 11 is lighter than the solvent-based two-component adhesive, the high
frequency characteristic is improved in the radiation of the sound due to the vibration of the
speaker into the air.
[0014]
Second Embodiment Next, a second embodiment will be described based on FIG. FIG. 4 is a
detailed half sectional view of the main part of the speaker of the second embodiment. The same
reference numerals as in FIG. 1 of the first embodiment indicate the same components in FIG. 4
of the second embodiment, and the connection relationship between them is as described above.
Is omitted.
[0015]
The second embodiment corresponds to a modification of the first embodiment, in which the
direction of the cylindrical inner peripheral edge portions 3a and 4a of the damper 3 and the
diaphragm 4 is reverse to that of the first embodiment.
[0016]
In the case of the first embodiment of FIG. 1, the inner peripheral edge portion 3 a of the damper
3 protrudes from the main body of the damper 3 in the same direction as the fitting direction X
with respect to the bobbin 2.
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The same applies to the inner peripheral edge 4 a of the diaphragm 4. The end portions of the
inner peripheral edge portions 3a and 4a become edges (sharp edges) when viewed along the
axial direction of the bobbin 2. Therefore, when the inner peripheral edge portions 3a and 4a of
the damper 3 and the diaphragm 4 are fitted to the acrylic double-sided adhesive tape 11 on the
bobbin 2 along the fitting direction X parallel to the axial direction, the edges are acrylic There is
a strong tendency for the double-sided adhesive tape 11 to be stuck and to receive insertion
resistance. Stuck is particularly likely to occur between the edge of the double-sided adhesive
tape 11.
[0017]
Therefore, in the second embodiment shown in FIG. 4, in order to reduce the fitting resistance
when the cylindrical inner peripheral edge portion 3 a of the damper 3 is fitted into the bobbin 2,
the inner peripheral edge portion 3 a of the damper 3 And is projected from the main body of the
damper 3 in a direction opposite to the fitting direction X with respect to. The same applies to
the inner peripheral edge 4 a of the diaphragm 4. The end portions of the inner peripheral edge
portions 3 a and 4 a are edges when viewed along the axial direction of the bobbin 2. However,
when the inner peripheral edge portions 3a and 4a of the damper 3 and the diaphragm 4 are
fitted along the fitting direction X parallel to the axial direction to the acrylic double-sided
adhesive tape 11 on the bobbin 2, the inner peripheral edge portion 3a, Since the edge of 4a is
directed in the direction opposite to the inserting direction X, it does not stick to the acrylic
double-sided adhesive tape 11, and the lower corner of the inserting direction X is smoothly
connected to the vertical main body with a constant curvature. Therefore, the insertion resistance
is small. Therefore, the damper 3 and the inner peripheral edge portions 3a and 4a of the
diaphragm 4 can be smoothly fitted to the acrylic double-sided adhesive tape 11, and the
workability of the fitting is improved. The other effects are the same as in the first embodiment.
[0018]
Third Embodiment Next, a third embodiment will be described with reference to FIG. FIG. 5 is a
detailed half sectional view of the main part of the speaker of the third embodiment. The same
reference numerals as in FIG. 1 of the first embodiment indicate the same constituent elements in
FIG. 5 of the third embodiment, and the connection relationship between them is as described
above. Is omitted.
[0019]
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The third embodiment corresponds to a development of the first embodiment, and the acrylic
double-sided adhesive tape 11 is used also in the combination of the damper 3 as a vibration
system component and the metal frame 7 as an outer shell. . An acrylic double-sided adhesive
tape 11 shown by a thick black line is attached to the inner surface of the step 7 a of the frame 7,
and the outer peripheral part 3 b of the damper 3 is attached to the acrylic double-sided adhesive
tape 11. It is done. Since the adhesive bonding is performed via the acrylic double-sided adhesive
tape 11, the workability is better as compared to the case of adhesive bonding using a solventbased two-component adhesive. The other configuration and effects are the same as in the first
embodiment (FIG. 1), and the inner peripheral edge portion 4 a of the diaphragm 4 is fitted into
the acrylic double-sided adhesive tape 11 wound and attached to the bobbin 2. The inner
peripheral edge portion 3a of the damper 3 is fitted into the same acrylic double-sided adhesive
tape 11, and the adhesive force is expressed by compression respectively, and the diaphragm
inner peripheral edge portion 4a and the damper inner peripheral edge portion 3a It is coupled
to the bobbin 2. Description of the other components is omitted. The third embodiment may be
applied to the second embodiment (FIG. 4).
[0020]
Fourth Embodiment Next, a fourth embodiment will be described based on FIG. FIG. 6 is a
detailed half sectional view of the main part of the speaker of the fourth embodiment. The same
reference numerals as in FIG. 1 of the first embodiment indicate the same components in FIG. 6
of the fourth embodiment, and the connection relationship between them is as described above.
Is omitted.
[0021]
The fourth embodiment corresponds to a development of the first embodiment, and is connected
to the outer peripheral portion of the diaphragm 4 as a vibration system component, this also has
an edge 5 as a vibration system component and a metal frame 7 as an outer shell. The acrylic
double-sided adhesive tape 11 is also used in bonding with The acrylic double-sided adhesive
tape 11 indicated by a thick black line is attached to the surface of the flange 7 b on the outer
periphery of the frame 7, and the outer circumferential part 5 a of the edge 5 is attached to the
acrylic double-sided adhesive tape 11. Adhesively bonded. Since the adhesive bonding is
performed via the acrylic double-sided adhesive tape 11, the workability is better as compared to
the case of adhesive bonding using a solvent-based two-component adhesive. The other
12-05-2019
8
configuration and effects are the same as in the first embodiment (FIG. 1), and the inner
peripheral edge portion 4 a of the diaphragm 4 is fitted into the acrylic double-sided adhesive
tape 11 wound and attached to the bobbin 2. The inner peripheral edge portion 3a of the damper
3 is fitted into the same acrylic double-sided adhesive tape 11, and the adhesive force is
expressed by compression respectively, and the diaphragm inner peripheral edge portion 4a and
the damper inner peripheral edge portion 3a It is coupled to the bobbin 2. Description of the
other components is omitted. The fourth embodiment may be applied to the second embodiment
(FIG. 4) or the third embodiment (FIG. 5).
[0022]
[Regarding the double-sided adhesive tape fixing device] FIG. 7 is a preferable double-sided
adhesive tape fixed when fixing the damper 3 and the diaphragm 4 to the bobbin 2 as a vibration
system component in the speaker via the acrylic double-sided adhesive tape 11 FIG. 10 is a
perspective view showing the device 20. A pair of guide grooves 21 a and 21 a are formed in
parallel to the upper surface of the guide shaft fixing base 21. A guide shaft 22 made of a soft
material such as a synthetic resin is erected vertically at a central portion of the guide shaft
fixing base 21 in a fixed state. The guide shaft 22 is for externally fitting the bobbin 2, and in the
case of the outer fitting, the diameter is reduced by elastic deformation, and the elastic restoring
force at that time causes the bobbin 2 that is externally fitted to be strong. It adheres to A pair of
movable bodies 23, 23 in which guide portions (not shown) are slidably engaged with the pair of
guide grooves 21a, 21a, respectively, are mounted on the guide shaft fixing base 21. A
semicircular concave portion is formed on the center side of the facing surfaces of the pair of
movable bodies 23, 23. A pressing action portion 24, 24 made of a soft material such as a
synthetic resin is formed across the concave portion and flat portions on both sides thereof. It is
fixed. The diameter of the semi-circular concave portion of the pressure application portion 24 is
substantially the same as the diameter of the bobbin 2.
[0023]
Next, an operation of adhesively bonding the bobbin 2 and the diaphragm 4 and the damper 3
shown in FIG. 1 through the acrylic double-sided adhesive tape 11 using the double-sided
adhesive tape fixing device 20 described above will be described. The acrylic double-sided
adhesive tape 11 is wound and attached to the bobbin 2, and the inner peripheral edge 4a of the
diaphragm 4 is fitted into the bobbin 2 so that the inner circumferential edge 4a is positioned on
the acrylic double-sided adhesive tape 11 and temporarily fixed. . With the pair of movable
members 23 in the double-sided adhesive tape fixing device 20 separated from each other, the
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9
bobbin 2 to which the above-mentioned acrylic double-sided adhesive tape 11 is wound and
attached is externally fitted on the soft guide shaft 22. Next, the pair of movable bodies 23, 23
are caused to approach the bobbin 2 on the guide shaft 22 by hydraulic drive or the like as
shown by thick arrows Y, Y ', and the soft pressurizing action portion 24, the inside of the
movable bodies 23, 23, By pressing the outer peripheral surface of the inner peripheral edge
portion 4a of the diaphragm 4 to the center side in the radial direction equally with each other,
the inner peripheral edge portion 4a of the diaphragm 4 is pressed against the acrylic doublesided adhesive tape 11 with uniform and large force. At the same time, the acrylic double-sided
adhesive tape 11 is uniformly and strongly pressed against the bobbin 2, thereby strongly
bonding and bonding the inner peripheral edge 4 a of the diaphragm 4 to the bobbin 2 via the
acrylic double-sided adhesive tape 11. The work of bonding and bonding the inner peripheral
edge portion 3a of the damper 3 to the acrylic double-sided adhesive tape 11 on the bobbin 2 is
similarly performed. The pressure is preferably 5 kg / cm 2 or more, for example. The pressing
force can be easily and accurately controlled by controlling the driving system such as oil
pressure, and the pressure bonding can be stably and favorably performed on the bobbin 2
without damaging the diaphragm 4 and the damper 3. By using such a double-sided adhesive
tape fixing device 20, the workability of assembly is greatly improved.
[0024]
According to the invention as claimed in claim 1 of the speaker, since the acrylic double-sided
adhesive tape is used as a medium for bonding the vibration system components to each other,
the solvent-based two-component adhesive Compared to the conventional technology using the
above, it does not require any special care for adhesion management, and it is sufficient to
perform only a simple paste and press operation, and it is not necessary to take time for curing,
As assembling can be performed in a short time, the workability as a whole is greatly improved,
and no harmful components are contained, so there is no problem in environmental health, and
the adhesive strength is strong and uniform as a whole, and the adhesive quality is high. Its
stability can also be good.
[0025]
According to the invention of claim 2, the adhesion quality and adhesion stability of the
diaphragm and the damper to the bobbin which is a vibration system component are improved,
and the environmental health is improved because they are harmless. Furthermore, it is excellent
in workability in terms of time and work, has high cost merit, and can realize a speaker with good
high-frequency characteristics because of its strong and uniform adhesive strength.
[0026]
According to the invention of claim 3, since the inner peripheral edge portion of the diaphragm
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or damper is made to project in the opposite direction to the fitting direction with respect to the
acrylic double-sided adhesive tape on the bobbin, the edges of the inner peripheral edge portion
(sharp edge The insertion resistance due to the sticking can be reduced, and the workability of
the insertion to the acrylic double-sided adhesive tape can be improved.
[0027]
According to the invention of claim 4 and claim 5, also in the connection between the damper
and the frame or the connection between the edge as a vibration system component connected to
the diaphragm and the frame, the connection via the acrylic double-sided adhesive tape
Therefore, the workability can be improved as compared with the case of using a solvent-based
two-component adhesive.
[0028]
According to the invention of claim 6, since the relatively thick acrylic foam base material
foamed in the acrylic double-sided adhesive tape is provided, excellent vibrational absorbability
is exhibited, and the bobbin and the diaphragm or damper are provided. Can effectively prevent
the generation of a stagnant sound, and can make the acoustic characteristics better.
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