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DESCRIPTION JP2001309490

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DESCRIPTION JP2001309490
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
separately formed speaker suitable for recycling.
[0002]
2. Description of the Related Art Conventionally, speaker diaphragms, dampers, voice coils and
voice coil bobbins are difficult to be integrally molded because the required characteristics are
different, and each is formed of different materials. When joining the diaphragm, the damper and
the voice coil bobbin, it is necessary to firmly join them so as to withstand the vibration of the
vibration system. Conventionally, bonding of a diaphragm, a damper, and a voice coil bobbin
formed of different materials is performed by bonding each with an adhesive and drying the
adhesive.
[0003]
In recent years, environmental problems have been emphasized, and recycling technology and
products compatible with recycling have been proposed in all technical fields. The same applies
to the speakers, and speakers suitable for recycling will be increasingly noted in the future.
However, since the conventional speaker uses an adhesive for bonding the diaphragm, the
damper and the voice coil bobbin, it is extremely difficult to separate the diaphragm, the damper
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and the voice coil bobbin. Therefore, conventional speakers are difficult to separately dispose or
recycle each part at the time of disposal. In addition, when the amount of the adhesive applied is
too large, the weight in the vibration system increases, which causes a problem of reducing the
sound pressure level of the speaker. On the contrary, when the application amount of the
adhesive is too small, there is a problem that an operation failure such as a flicker occurs due to
an adhesion failure of each part. Furthermore, when joining each component using an adhesive,
it is necessary to dry the adhesive, so there is a problem that the manufacturing time becomes
long.
[0004]
The present invention has been made to solve the above-described conventional problems, and
the object of the present invention is to firmly connect a diaphragm, a damper, and a voice coil
bobbin of a speaker without using an adhesive, and The object is to provide a speaker that can be
easily separated.
[0005]
A speaker according to the present invention comprises a diaphragm, a damper, a voice coil, a
voice coil bobbin to which the voice coil is attached, and the voice coil bobbin together with the
diaphragm and the damper. The vibrating plate and a bonding means for mechanically bonding
the damper to the boy coil bobbin.
[0006]
In a preferred embodiment, the joining means is a fitting means for joining the diaphragm and
the damper by fitting with the voice coil bobbin.
[0007]
In a preferred embodiment, the voice coil bobbin has a fitting recess, the diaphragm and the
damper have an insertion opening, and the fitting means has a fitting protrusion, and the
insertion unit is used for the insertion. It fits with the voice coil bobbin.
[0008]
In a preferred embodiment, the voice coil bobbin has a fitting protrusion, the diaphragm and the
damper have an insertion port, and the fitting means has a fitting recess, and through the
insertion port It fits with the voice coil bobbin.
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[0009]
In a preferred embodiment, the joining means is an adsorption means for joining the diaphragm
and the damper to the voice coil bobbin by an adsorption force.
[0010]
In a preferred embodiment, the bonding means is an elastic means for bonding the diaphragm
and the damper to the voice coil bobbin by an elastic force.
[0011]
In a preferred embodiment, a bonding slit is defined in the diaphragm and the damper, and the
bonding means is provided in the voice coil bobbin, inserted in the bonding slit and defined
between the voice coil bobbin and the bonding slit. The projection is a bonding projection for
fitting the diaphragm and the damper in the gap.
[0012]
Hereinafter, the operation of the loudspeaker according to the present invention will be
described.
The speaker according to the present invention does not need to use an adhesive because the
diaphragm and the damper are sandwiched between the voice coil bobbin and the joining means
and mechanically joined by a predetermined force.
Therefore, separation can be easily performed by applying a force opposite to the joining force,
and separate disposal and recycling can be performed for each part at the time of disposal.
Moreover, when using the loudspeakers, each is maintained in a firmly joined state.
Furthermore, since the adhesive is not used, the problem that the sound pressure level is lowered
due to the increase in weight and the operation failure such as the flicker due to the adhesion
failure of each part occurs is solved.
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Furthermore, since the step of drying the adhesive is not necessary, the manufacturing efficiency
can be improved.
[0013]
For example, since the fitting means is used as the joining means, the diaphragm and the damper
can be joined to the voice coil bobbin by fitting.
[0014]
Alternatively, since the suction means is used as the bonding means, the diaphragm and the
damper can be bonded to the voice coil bobbin by the suction force of the suction means.
[0015]
Alternatively, since the elastic means is used as the joining means, the diaphragm and the
damper can be joined to the voice coil bobbin by the elastic force.
[0016]
Alternatively, since the bonding projection is used as the bonding means, bonding can be
performed by press-fitting and fitting the diaphragm and the damper into the gap between the
bonding projection and the voice coil bobbin.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present
invention will be described below with reference to FIG. 1, but the present invention is not
limited to these embodiments.
[0018]
FIG. 1 is a cross-sectional view of a loudspeaker according to a preferred embodiment of the
present invention.
The speaker 1 includes a diaphragm 2, a damper 3, a voice coil bobbin 4, a voice coil 5, a
magnetic circuit unit 6, a frame 7, and a joining unit 8.
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The diaphragm 2 and one end of the damper 3 are attached to the frame 7 in a conventional
manner.
The voice coil 5 is wound or inserted into the voice coil bobbin 4, and one end thereof is
disposed in the magnetic gap of the magnetic circuit unit 6.
The voice coil bobbin 4 is attached to the magnetic circuit unit 6 in the usual manner.
[0019]
The joining means 8 is provided to join the diaphragm 2 and the damper 3 to the voice coil
bobbin 4.
The diaphragm 2 and the damper 3 are mechanically joined to the voice coil bobbin 4 by
sandwiching one end of the diaphragm 2 and the damper 3 between the joining means 8 and the
voice coil bobbin 4 and applying a predetermined force.
The details of the bonding means 8 will be described later in the embodiment.
[0020]
In the speaker 1 in the present embodiment, the diaphragm 2 and the damper 3 are mechanically
joined to the voice coil bobbin 4 without using an adhesive. The diaphragm 2, the damper 3 and
the voice coil bobbin 4 can be easily separated by applying a force in the opposite direction.
Therefore, when the speaker is discarded, the diaphragm 2, the damper 3 and the voice coil
bobbin 4 can be separated and discarded, and recycling can be coped with.
[0021]
The preferred embodiments of the present invention will be specifically described below with
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reference to FIGS. 2 to 5, but the present invention is not limited to these embodiments.
[0022]
FIG. 2 is a cross-sectional view showing the characterizing portion of the loudspeaker according
to the first embodiment of the present invention.
The speaker 1 includes a diaphragm 2, a damper 3, a voice coil bobbin 4, a voice coil 5, and a
fitting unit 9 which is a bonding unit.
[0023]
For example, as shown in FIG. 2A, the fitting means 9 is in the form of a lid whose upper surface
is closed.
In this case, the fitting means 9 can join the diaphragm 2 and the damper 3 to the voice coil
bobbin 4 and can be dustproof. Alternatively, the fitting means 9 can be realized even if it is a
cylindrical body. The fitting means 9 has a fitting protrusion 10. Therefore, preferably, the fitting
means 9 has a thickness enough to provide the fitting convex portion 10. The number and
position of the fitting projections 10 may be any suitable number and position. The shape of the
fitting projection 10 may be, for example, a cylindrical shape as shown in FIG. 2 (a) or a spherical
shape as shown in FIG. 2 (b), but is not limited to these shapes. Can be adopted. For example, the
shape of the fitting projection 10 may be a polygonal column.
[0024]
The voice coil bobbin 4 has a fitting recess 11 defined therein. The number and position of the
fitting recesses 11 correspond to the fitting protrusions 10 so that the fitting protrusions 10 can
be fitted. Preferably, the voice coil bobbin 4 has a thickness that can define the fitting recess 11.
For example, by inserting the voice coil 5 into the voice coil bobbin 4 as shown in FIG. 2A, it is
possible to obtain a thickness that can define the fitting recess 11.
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[0025]
When the voice coil bobbin 4 has a normal thickness and the fitting recess 11 can not be defined,
for example, as shown in FIGS. 2C and 2D, the voice coil bobbin 4 has a ring 12 at the upper end.
The ring 12 has a thickness that can define the fitting recess 11, and the fitting recess 11 is
defined. The ring 12 is, for example, integrally molded with the voice coil bobbin 4 as shown in
FIG. 2 (c). Also, the ring 12 may be formed separately from the voice coil bobbin 4 and attached
to the voice coil bobbin 4 in any suitable manner. In order to attach the ring 12 to the voice coil
bobbin 4, for example, as shown in FIG. 2D, the voice coil bobbin 4 has a protrusion formed on
the ring 12 and a recess formed on the ring 12, and the protrusion and the recess are fitted.
[0026]
In the diaphragm 2 and the damper 3, an insertion port 13 is defined so that the fitting convex
portion 10 can be inserted into one end (a portion to be joined to the voice coil bobbin 4). The
number and position of the insertion openings 13 correspond to the fitting projections 10.
[0027]
Hereinafter, a method of joining the diaphragm 2 and the damper 3 to the voice coil bobbin 4
will be described. The diaphragm 2 and the damper 3 are installed at the upper end of the voice
coil bobbin 4 so that the positions of the insertion opening 13 and the fitting recess 11 coincide
with each other. For positioning of the diaphragm 2, the damper 3 and the voice coil bobbin 4,
for example, a dowel may be formed on the voice coil bobbin and a recess may be formed on the
diaphragm and the damper. Then, the fitting convex portion 10 of the fitting means 9 is press-fit
and fitted into the fitting concave portion 11 through the diaphragm 2 and the insertion opening
13 of the damper 3. Thus, the diaphragm 2 and the damper 3 are mechanically joined to the
voice coil bobbin 4.
[0028]
When the diaphragm 2 and the damper 3 are separated from the voice coil bobbin 4, the
separation can be easily performed by applying a force in the reverse direction to the force for
press-fitting the fitting means 9 and removing the fitting. In addition, when the speaker is used, it
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is firmly joined by fitting, and has a joining strength that can withstand vibration.
[0029]
As described above, in the present embodiment, since the diaphragm 2 and the damper 3 are
sandwiched between the fitting means 9 and the voice coil bobbin 4 and press-fit and fitted, it is
not necessary to use an adhesive. In the present embodiment, the case where the fitting means 9
has the fitting projection 10 and the voice coil bobbin 4 has the fitting recess 11 has been
described, but the fitting means 9 is fitted with the fitting recess 11 and the voice coil bobbin 4
The convex part 10 may be provided. In this case, the voice coil bobbin 4 may have a thickness
enough to provide the fitting protrusion 10, and the fitting unit 9 may have a thickness enough
to define the fitting recess 11.
[0030]
Next, a second embodiment will be described. FIG. 3 is a cross-sectional view showing a
characterizing portion of a loudspeaker according to a second embodiment of the present
invention. In the second embodiment, an adsorption means 14 having an adsorption force is used
as the bonding means 8.
[0031]
As the adsorption means 14, any appropriate one may be employed, but typically, an adsorption
rubber is used. The diaphragm 2 and the damper 3 are sandwiched between the suction means
14 and the voice coil bobbin 4, and are joined to the voice coil bobbin 4 by the suction force of
the suction means 14. In detail, the air pressure inside the adsorption means 14 is made lower
than the air pressure outside the adsorption means 14 by exhausting the inside of the adsorption
means 14 (the space formed by the adsorption means 14 and the voice coil bobbin 4 and the
diaphragm 2). By doing this, the diaphragm 2 and the damper 3 can be joined to the voice coil
bobbin 4 by the air pressure outside the suction means 14. FIG. 3A shows a state in which the
inside of the adsorption means 14 is exhausted. FIG. 3 (b) shows the state before the inside of the
adsorption means 14 is exhausted.
[0032]
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The adsorption means 14 is provided with an exhaust hole 15 and a sealing plug 16. The exhaust
hole 15 is provided to exhaust the inside of the adsorption means 14. The sealing plug 16 is
provided in order to maintain the exhausted state inside the adsorption means 14 by being
inserted into and fixed to the exhaust hole 15.
[0033]
The voice coil bobbin 4 has a shape in which the upper part is closed so that the diaphragm 2
and the damper 3 can be installed and the adsorption means 14 can be adsorbed. Further, the
upper portion of the voice coil bobbin 4 is formed of a material (for example, aluminum or the
like) with which the suction means 14 can suction. Preferably, as shown in FIG. 3, the upper
surface of the voice coil bobbin 4 is formed thicker than the portion where the diaphragm 2 and
the damper 3 are installed, by the thickness of the diaphragm 2 and the damper 3. This is
because when the diaphragm 2 and the damper 3 are installed on the voice coil bobbin 4, the
adsorption surface formed by the diaphragm 2 and the upper surface of the voice coil bobbin 4
becomes flat, and the adsorption unit 14 easily adsorbs. Furthermore, this is because the
diaphragm 2 and the damper 3 can be centered.
[0034]
Hereinafter, a method of joining the diaphragm 2 and the damper 3 to the voice coil bobbin 4
will be described. As shown in FIG. 3B, the damper 2 and the diaphragm 3 are disposed at
predetermined positions on the upper surface of the voice coil bobbin 4, and the adsorption
means 14 is disposed from above. In FIG. 3 (b), the pressure A outside the adsorption means 14
and the pressure B inside (in detail, the reaction force of the adsorption means 14 is considered)
are in an equilibrium state. Here, when the air is exhausted from the exhaust hole 15, the
pressure A causes the state shown in FIG. 3 (a). In FIG. 3 (a), since the air pressure B inside the
adsorption means 14 is extremely small (not shown), the diaphragm 2 and the damper 3 are
separated from the adsorption means 14 and the voice coil bobbin 4 by the air pressure A
outside the adsorption means 14. It is sandwiched and joined. In order to maintain the exhaust
state inside the adsorption means 14, the exhaust knob 16 is inserted into the sealing plug 15
and fixed by, eg, fusion bonding.
[0035]
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In order to separate the diaphragm 2 and the damper 3 from the voice coil bobbin 4, the sealing
plug 16 is broken and removed from the exhaust hole 15. Then, air leaks into the inside of the
adsorption means 14 through the exhaust hole 15, the state shown in FIG. 3 (b) is obtained again,
and separation can be easily performed.
[0036]
Next, another embodiment of the adsorption means 14 will be described with reference to FIGS.
3 (c) to 3 (e). The suction means 14 has a leaky projection 17. In order to join the diaphragm 2
and the damper 3 to the voice coil bobbin 4, as shown in FIG. 3 (d), the suction means 14 is
pressed with a pressure in the A direction so that the inside is exhausted. Put in a state. In the
state of FIG. 3C, as described above, the diaphragm 2 and the damper 3 are joined to the voice
coil bobbin 4 by the pressure in the A direction. In order to separate the diaphragm 2 and the
damper 3 from the voice coil bobbin 4, the leakage projection 18 is broken in FIG. 3C so that the
leakage hole 18 is defined as shown in FIG. 3E. Be done. In FIG. 3 (e), air leaks into the suction
means 14 through the leak hole 18, and the diaphragm 2 and the damper 3 can be easily
separated from the voice coil bobbin 4.
[0037]
Next, the third embodiment will be described. FIG. 4 is a cross-sectional view showing a
characterizing portion of a loudspeaker according to a third embodiment of the present
invention. In this embodiment, an elastic means 19 having elasticity is used as a joining means.
The elastic means 19 has a dome shape. The elastic means 19 can be realized, for example, as an
elastic dust cap.
[0038]
The elastic means 19 has an inner diameter in a normal state where no force is applied to the
elastic means 19 equal to or less than the outer diameter of the voice coil bobbin 4 in order to
use the elastic force in the inner circumferential direction as described later. Alternatively, in
order to use the elastic force in the outer peripheral direction as described later, the elastic
means 19 is formed such that the outer diameter at the normal time is equal to or larger than the
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inner diameter of the voice coil bobbin 4.
[0039]
The diaphragm 2 and the damper 3 are sandwiched between the elastic means 19 and the voice
coil bobbin 4, and are joined to the voice coil bobbin 4 by the elastic force of the elastic means
19. Therefore, the elastic means 19 is attached such that the elastic force acts in the direction of
joining the diaphragm 2 and the damper 3 to the voice coil bobbin 4. Preferably, the voice coil
bobbin 4 has a strength capable of withstanding the elastic force so as not to be deformed by the
elastic force of the elastic means 19. The details will be described below.
[0040]
The case where the normal inner diameter of the elastic means 19 is equal to or less than the
outer diameter of the voice coil bobbin 4 will be described with reference to FIGS. 4 (a) and 4 (b).
FIG. 4A shows a state in which the elastic force of the elastic means 19 acts on the diaphragm 2
and the damper 3. FIG. 4 (b) shows a state in which the elastic means 19 is expanded. The elastic
means 19 expanded in the outer peripheral (C) direction as shown in FIG. 4 (b) exerts an elastic
force to contract in the inner peripheral (D) direction. In FIG. 4B, when the force for expanding
the elastic means 19 is eliminated, the state of FIG. 4A is obtained by the elastic force in the D
direction. In FIG. 4A, since the elastic means 19 has an inner diameter at the normal time equal
to or less than the outer diameter of the voice coil bobbin 4, an elastic force acts so as to further
contract in the D direction. Therefore, the diaphragm 2 and the damper 3 are sandwiched and
joined between the voice coil bobbin 4 and the elastic means 19 by the elastic force in the D
direction.
[0041]
Next, the case where the outer diameter of the elastic means 19 at the normal time is equal to or
larger than the inner diameter of the voice coil bobbin 4 will be described with reference to FIGS.
4 (c) and 4 (d). FIG. 4C shows a state in which the elastic force of the elastic means 19 acts on the
diaphragm 2 and the damper 3. FIG. 4D shows a state in which the elastic means 19 is contracted
in the inner circumferential (D) direction. As shown in FIG. 4D, the elastic means 19 contracted in
the inner circumferential (D) direction exerts an elastic force to expand in the outer
circumferential (C) direction. In FIG. 4 (d), when the force for contracting the elastic means 19 is
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eliminated, the state shown in FIG. 4 (c) is obtained by the elastic force in the C direction. In FIG.
4C, since the outer diameter of the elastic means 19 at the normal time is equal to or larger than
the inner diameter of the voice coil bobbin 4, an elastic force acts to further expand in the C
direction. Therefore, the diaphragm 2 and the damper 3 are sandwiched and joined between the
voice coil bobbin 4 and the elastic means 19 by the elastic force in the C direction.
[0042]
To separate the diaphragm 2 and the damper 3 from the voice coil bobbin 4, a force against the
acting elastic force is applied to the elastic means 19. That is, in FIG. 4A, the elastic means 19 is
expanded again in the C direction. In FIG. 4 (c), the elastic means 19 is contracted again in the D
direction.
[0043]
Next, a fourth embodiment will be described. FIG. 5 is a schematic view for explaining the
characterizing portion of the fourth embodiment. FIG. 6A is a plan view of the diaphragm 2. (B) is
sectional drawing which cut | disconnected the speaker by the E-E 'line | wire of (a). In the
present embodiment, the bonding projection 20 provided on the voice coil bobbin 4 is used as
the bonding means. The bonding protrusions 20 are circumferentially provided, and any suitable
number may be employed. The bonding projection 20 is formed such that the distance between
the upper end of the voice coil bobbin 4 and the bonding projection 20 is equal to or less than
the thickness of the diaphragm 2 and the damper 3.
[0044]
The diaphragm 2 and the damper 3 have a bonding slit 22 defined therein. The bonding slit 22 is
defined so that the bonding projection 20 can be inserted and moved. Therefore, the number and
position of the bonding slits 22 correspond to the number and positions of the bonding
projections 20.
[0045]
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Hereinafter, a method of joining the diaphragm 2 and the damper 3 to the voice coil bobbin 4
will be described. The voice coil bobbin 4 is disposed on the diaphragm 2 and the damper 3 from
below so that the bonding projection 20 is inserted into the bonding slit 22. The voice coil
bobbin 4 is rotated relative to the diaphragm 2 and the damper 3 so that the bonding projection
20 moves in the direction (F direction) in which the projecting shape of the bonding projection
20 is formed. Here, since the gap 21 between the bonding projection 20 and the upper end of
the voice coil bobbin 4 is smaller than the thickness of the diaphragm 2 and the damper 3, the
bonding projection 20 and the bonding projection 20 can be The diaphragm 2 and the damper 3
are fitted in the gap 21 with the voice coil bobbin 4. Thus, since the diaphragm 2 and the damper
3 are sandwiched between the voice coil bobbin 4 and the bonding projection 20, the diaphragm
2 and the damper 3 are strongly bonded particularly in the vibration direction of the diaphragm.
In order to separate the diaphragm 2 and the damper 3 from the voice coil bobbin 4, a force is
applied to rotate the voice coil bobbin 4 with respect to the diaphragm 2 and the damper 3 in the
G direction, and the fitting is removed.
[0046]
Preferably, the bonding projection 20 has a claw portion 23 as shown in FIG. 5 (c). Further, in the
diaphragm 2 and the damper 3, grooves 24 in which the claws 23 of the bonding projections 20
are engaged are defined. In such a structure, when joining the diaphragm 2 and the damper 3 to
the voice coil bobbin 4, by engaging the claws 23 with the grooves 24, not only the vibration
direction of the diaphragm but also the vibration direction of the diaphragm Can also be joined
firmly in the vertical direction.
[0047]
Although the preferred embodiments of the present invention have been described above, the
present invention is not limited to these embodiments, and the diaphragm and the damper are
sandwiched between the joining means and the voice coil bobbin and mechanically joined. If it is
a speaker, it may be adopted. For example, the joining means has a male screw (female thread)
and the voice coil bobbin has a female screw (male thread), and the joining means and the voice
coil bobbin are screwed together, the diaphragm and the damper are sandwiched and
mechanically joined. May be Further, in FIG. 5C, the gap between the bonding projection 18 and
the voice coil bobbin 4 is defined by the claw portion 21 of the bonding projection 18 and the
voice coil bobbin 4 without fitting the diaphragm 2 and the damper 3 into the gap. It may join
only by engagement with slot 22.
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[0048]
According to the speaker of the present invention, since the diaphragm and the damper are
sandwiched between the joining means and the voice coil bobbin and mechanically joined by a
predetermined force, there is no need to use an adhesive, and sorting is easily performed. Is
possible. Moreover, when the speaker is used, it has a bonding strength that can withstand
vibration.
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