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DESCRIPTION JP2005064830

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DESCRIPTION JP2005064830
PROBLEM TO BE SOLVED: To provide a speaker device which can improve the drive efficiency of
a piezoelectric speaker, can be manufactured at low cost, and can improve the sound quality.
SOLUTION: A first speaker 11 having a voice coil bobbin 60 to which a diaphragm 40 and a
damper 61 are attached is provided, and a piezoelectric second speaker 12 is provided on the
open side of the first speaker 11. An induction coil 80 is supported by the midway member 25
extending between the first speaker 11 and the second speaker. Further, a magnet 50 is attached
to the outer diameter side of the voice coil bobbin 60 and to a portion facing the induction coil
80. [Selected figure] Figure 2
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
A composite speaker (hereinafter referred to as a speaker device) configured by combining a
plurality of speakers, such as a woofer that reproduces mainly on low tones (medium low tones)
and a tweeter that mainly reproduces high tones (medium to high tones).
Is widely used in car audio, household audio equipment, etc.
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1
[0003]
Among such speaker devices, there is a device using a piezoelectric speaker which reproduces a
high sound area by electromagnetic induction as a tweeter. An example of the speaker apparatus
1 which comprises the piezoelectric speaker 2 in FIG. 8 is shown. In the speaker device 1 shown
in FIG. 8, an induction coil 3 for driving the piezoelectric speaker 2 is attached to the center pole
portion 4. Further, a voice coil 7 for vibrating the woofer diaphragm 6 is attached to the voice
coil bobbin 5.
[0004]
The voice coil 7 vibrates in the vertical direction in FIG. 8 so that power is generated in the
induction coil 3 by electromagnetic induction on the induction coil 3 for electromagnetic
coupling. When an induced voltage due to the power generation is applied to the piezoelectric
element 2 a of the piezoelectric speaker 2, vibration occurs in the piezoelectric element 2 a. The
diaphragm 2 b is vibrated by this vibration, and the piezoelectric speaker 2 reproduces the
sound.
[0005]
In addition, as a structure of a speaker apparatus provided with the piezoelectric type speaker 2
mentioned above, there exists a structure of patent document 1. FIG.
[0006]
JP 9-18993 A (abstract, see FIG. 1)
[0007]
The piezoelectric speaker 2 used exclusively for the speaker device 1 described above and driven
by the electromagnetic induction of the voice coil 7 has an insufficient function as a speaker.
That is, in the configuration of the piezoelectric speaker 2 described above, the voltage generated
by electromagnetic induction in the induction coil 3 is low.
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Therefore, the driving efficiency is low, and it is difficult to reproduce sound in a wide band.
[0008]
Further, in the speaker device 1 having the above-described configuration, since the voltage
generated by electromagnetic induction is low, it is necessary to fix the induction coil 3 for
driving the piezoelectric speaker 2 to a magnetic body, and the attachment position is limited.
And the material of the portion to which the induction coil 3 is attached is limited.
[0009]
The present invention has been made based on the above-described circumstances, and the
objective of the present invention is to improve the driving efficiency of the piezoelectric second
speaker, to be manufactured at low cost, and to improve the sound quality. It is an object of the
present invention to provide a speaker device that can be designed.
[0010]
In order to solve the above problems, the present invention comprises a first speaker having a
diaphragm, a damper, and a voice coil bobbin to which the inner diameter side end portions
thereof are fixed, and the open side of this first speaker is piezoelectric In a speaker apparatus
provided with a second speaker of the present invention, an induction coil which is supported by
a midway member which extends between the first speaker and the second speaker and which is
present on the inner peripheral side of a voice coil bobbin And a magnet attached to the outer
diameter side of the voice coil bobbin and disposed in a state of facing the induction coil.
[0011]
In addition to the above-described invention, another invention is that the magnet is a plastic
magnet.
[0012]
Further, in another invention, in addition to the above-described invention, the inner peripheral
end of the diaphragm is attached to the open end of the first speaker in the plastic magnet.
[0013]
In addition to the above-described inventions, another invention is that the inner peripheral end
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of the damper is attached to the end face of the plastic magnet opposite to the end face of the
first speaker on the open side. It is.
[0014]
Furthermore, in addition to each above-mentioned invention, the other invention is further
provided with the induction coil inside the midway member.
[0015]
According to another invention, in addition to the above-described inventions, the plastic magnet
is provided integrally with the diaphragm and is located at an inner peripheral end of the
diaphragm.
[0016]
Further, according to another invention, in addition to the above-mentioned invention, the plastic
magnet is extended from the neck portion fixed to the voice coil bobbin and from the neck
portion toward the outer diameter side and the open side of the first speaker. And the inclined
portion.
[0017]
According to another invention, in addition to the above-mentioned invention, the inner wall side
of the plastic magnet is provided with a fitting recess into which the inner peripheral end of the
damper can be inserted when the plastic magnet is attached to the voice coil bobbin. It is
[0018]
According to the present invention, in the speaker device, it is possible to improve the drive
efficiency of the piezoelectric second speaker.
In addition, the speaker device can be manufactured inexpensively, and the sound quality can be
improved.
[0019]
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First Embodiment Hereinafter, a speaker apparatus according to a first embodiment of the
present invention will be described based on FIGS. 1 to 4.
FIG. 1 is a side view showing the configuration of the speaker device 10.
As shown in FIG. 1, the speaker device 10 includes a large diameter speaker 11 as a first speaker
and a piezoelectric speaker 12 as a second speaker.
Among these, the large diameter speaker 11 is a so-called woofer, and is capable of reproducing
bass (medium bass).
[0020]
The large diameter speaker 11 includes a yoke 20, a magnet 23, a plate 24, a frame 30, a
diaphragm 40, a voice coil bobbin 60, a damper 61, and a voice coil 62.
Among them, the yoke 20 is a member made of a magnetic material such as iron and having a
substantially inverted T-shaped cross section.
In the yoke 20, a large diameter disk portion 21 exists on the lower side, and a center pole
portion 22 having a diameter smaller than that of the disk portion 21 protrudes from the disk
portion 21 upward.
[0021]
Moreover, the magnet 23 is being fixed to the upper surface side of the disc part 21 with, for
example, an adhesive.
The magnet 23 is formed of, for example, a magnetic material such as ferrite.
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The magnet 23 is magnetized in the thickness direction (vertical direction).
However, the magnet 23 may have, for example, two magnets disposed facing each other via a
center plate or the like without being configured to be magnetized in the thickness direction.
In the case where two magnets are disposed to face each other, an arrangement in which south
poles or north poles face each other to generate a repulsive magnetic field is employed.
[0022]
Further, a plate 24 is attached to the top surface of the magnet 23. The plate 24 is also formed in
a ring shape like the magnet 23, and is made of, for example, a magnetic material such as iron.
Further, the plate 24 is fixed to the magnet 23 by, for example, bonding with an adhesive.
[0023]
A frame 30 is attached to the top of the plate 24. The frame 30 has a substantially funnel-shaped
appearance in which the inner diameter is increased as going upward and the inner diameter is
decreased as going downward. An insertion hole 32 is formed in the lower bottom portion 31
having a narrow inner diameter in the frame 30. The insertion hole 32 has a larger diameter than
the central hole 24 a of the plate 24.
[0024]
The lower bottom 31 of the frame 30 is attached and fixed to the plate 24 by a fixing means such
as an adhesive, a screw or the like. The frame 30 is made of, for example, a material such as iron
or aluminum alloy.
[0025]
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Further, the frame 30 is provided with a step 33. The stepped portion 33 is provided at a portion
of the frame 30 which is directed upward and outward from the lower bottom portion 31 by a
predetermined amount. The outer peripheral end 61 a of the damper 61 is attached to the
stepped portion 33. Further, a flange portion 34 is provided at the uppermost portion of the
frame 30. The outer peripheral side end 41 of the diaphragm 40 is attached to the flange 34 via
an edge 35.
[0026]
FIG. 2 is a side sectional view showing a portion A of FIG. 1 in an enlarged manner. As shown in
FIG. 2, a ring-shaped plastic magnet 50 as a magnet is attached to the inner circumferential end
portion 42 of the diaphragm 40. The plastic magnet 50 is referred to as a cylindrical voice coil
bobbin (hereinafter referred to as a bobbin 60). Attached to). That is, in the present embodiment,
the diaphragm 40 is attached to the bobbin 60 via the plastic magnet 50. The diaphragm 40 is
attached to the upper surface (the end surface of the large diameter speaker 11 on the open side)
of the plastic magnet 50.
[0027]
The plastic magnet 50 is formed by mixing a thermoplastic resin and a ferrite powder or a rare
earth magnet powder to form a mixture, pouring the mixture into a mold by injection molding,
and magnetizing a necessary part. Magnet. In the present embodiment, the plastic magnet 50 is a
so-called closed magnetic path type magnet magnetized in the radial direction (in FIG. 1 and FIG.
2, the inner side is N pole and the outer side is S pole is magnetized). Thereby, as shown in FIG. 2,
the magnetic force lines from the N pole are directed to the S pole in a state of being vertically
symmetrical.
[0028]
Incidentally, the plastic magnet 50 may be configured to be magnetized, for example, in the
vertical direction, instead of being configured to be magnetized in the radial direction, as shown
in FIG. . However, in this case, magnetic lines of force from the N pole to the S pole become
approximately half each on the inner and outer diameter sides of the plastic magnet 50, and the
magnetic flux density in the induction coil 80 described later is shown in FIG. It will be lower
compared to the case.
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[0029]
Further, in the present embodiment, the inner peripheral end 61 b of the damper 61 is attached
to the lower surface side of the plastic magnet 50 (end surface opposite to the open end surface
of the large diameter speaker 11). Therefore, the diaphragm 40 and the damper 61 are attached
via the upper and lower surfaces of the plastic magnet 50. However, the attachment aspect of the
plastic magnet 50, the diaphragm 40 and the damper 61 is not limited to this. For example, as
shown by the solid line in FIG. 3, the plastic magnet 50 may be attached to the bobbin 60 so as to
be located below the inner peripheral end 61 b of the damper 61. Further, as shown by the
broken line in FIG. 3, the plastic magnet 50 may be attached to the bobbin 60 so as to be
positioned on the upper side of the neck portion 43 bonding the diaphragm 40 directly to the
bobbin 60.
[0030]
Further, a voice coil 62 is attached to the lower end side of the bobbin 60 (see FIG. 1). The voice
coil 62 is present in the area of the magnetic flux formed by the magnet 23 (plate 24).
[0031]
As shown in FIG. 1, a supporter 25 made of, for example, a resin is attached to the center pole
portion 22 of the yoke 20. The supporter 25 supports the piezoelectric speaker 12 at its upper
end side. A stepped portion 26 for receiving the piezoelectric speaker 12 is provided on the
upper end side of the supporter 25. The frame 72 of the piezoelectric speaker 12 is mounted on
the step portion 26 in a mounted state. Further, an upper end portion 27 having a smaller
diameter than the other portions of the supporter 25 is provided toward the upper side than the
step portion 26. A piezoelectric element 71 for vibrating the diaphragm 70 of the piezoelectric
speaker 12 is attached to the upper surface of the upper end portion 27.
[0032]
The supporter 25 and the center pole portion 22 constitute a midway member.
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[0033]
Further, an induction coil 80 is disposed opposite to the support 25 in proximity to the abovedescribed plastic magnet 50.
That is, the induction coil 80 is disposed at the inner side (inner diameter side) of the bobbin 60.
The induction coil 80 is electrically connected to the above-described piezoelectric element 71
via a wire (not shown). When the plastic magnet 50 moves in the vertical direction due to the
close facing of the induction coil 80 to the plastic magnet 50, a change in magnetic flux density
accompanying the movement of the plastic magnet 50 causes electromagnetic induction. As a
result, an alternating current flows through the conducting wire 81, and an alternating voltage
(AC power) is applied to the piezoelectric element 71.
[0034]
As shown in FIG. 2, the plastic magnet 50 is disposed substantially horizontally with respect to
the induction coil 80 in a state where the speaker device 10 is installed on a horizontal surface.
However, the plastic magnet 50 does not necessarily have to be installed in a horizontal state
with respect to the induction coil 80, and it is necessary that the plastic magnet 50 exerts an
effective magnetic flux to the induction coil 80 in any way. It may be arranged at any position.
[0035]
Here, as shown in FIG. 2, the induction coil 80 may be attached to the outer peripheral surface of
the center pole portion 22 as long as it is inside the bobbin 60. In addition, as shown in FIG. 3,
the induction coil 80 may be attached to both the center pole portion 22 and the supporter 25.
Furthermore, as shown in FIG. 4, insert molding may be employed in which an induction coil 80
is provided inside the supporter 25. That is, as long as it is located inside the bobbin 60 and is
opposed to the plastic magnet 50, the attachment site of the induction coil 80 is not particularly
limited.
[0036]
The operation (operation) of the speaker device 10 having the above configuration will be
described below.
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[0037]
Since the magnet 23 described above is magnetized in the thickness direction, in the center hole
23a of the magnet 23, there is a magnetic field having a predetermined magnetic flux density,
which is directed to either one of the vertical direction of the magnet 23. ing.
When an AC voltage (AC power) is applied to the voice coil 62 existing inside the magnetic field
and an AC current flows in the voice coil 62, the voice coil 62 and the bobbin 60 move up and
down according to Fleming's left hand law. Reciprocate towards. Then, the diaphragm 40
constituting the woofer is vibrated, and the bass (medium bass) is reproduced.
[0038]
Here, with the start of the up and down reciprocation of the bobbin 60, the plastic magnet 50
attached to the bobbin 60 is also reciprocated in the up and down direction. Then, with the
movement of the plastic magnet 50 in the vertical direction, a change in magnetic flux density
occurs in the induction coil 80. That is, the induction coil 80 is in a state of generating power by
electromagnetic induction, and an alternating current flows in the conducting wire 81.
[0039]
Here, as described above in the background art, when an alternating current flows in the voice
coil 62, power is generated in the induction coil 80 also by the electromagnetic induction by the
alternating current in the voice coil 62, and an alternating current is generated. . Moreover, by
adjusting the direction of the magnetic flux of the plastic magnet 50 and the like, it is possible to
prevent the alternating current from being canceled each other. Therefore, a large alternating
current can be supplied to the conducting wire 81.
[0040]
When an alternating current flows through the conducting wire 81, an alternating voltage (AC
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power) generating the alternating current is applied to the piezoelectric element 71. As a result,
the piezoelectric element 71 vibrates, and the diaphragm 70 attached to the piezoelectric
element 71 vibrates. As a result, a sound is generated from the diaphragm 70. In this case, since
a large alternating current flows in the conducting wire 81, a high alternating voltage (AC power)
is applied to the piezoelectric element 71, and the vibration thereof is also sufficient to drive the
diaphragm 70.
[0041]
As described above, the diaphragm 70 can be driven by a strong vibration force, and
reproduction of the high range (middle to high range) from the diaphragm 70 is in a sufficient
state.
[0042]
According to the speaker device 10 having such a configuration, since the plastic magnet 50 is
provided to face the induction coil 80, when the plastic magnet 50 is reciprocated along with the
bobbin 60, the induction coil 80 is electromagnetically It is induced and an alternating current is
generated in the lead 81.
For this reason, in addition to the electromagnetic induction by the reciprocating motion of the
voice coil 62 as in the prior art, the electromagnetic coil by the reciprocating motion of the
plastic magnet 50 can be generated in the induction coil 80. In particular, since the plastic
magnet 50 is closely opposed to the induction coil 80, an alternating current voltage higher than
that of the voice coil 62 can be generated with respect to the induction coil 80.
[0043]
Thereby, high alternating current voltage (AC power) can be applied to the piezoelectric element
71 via the conducting wire 81. As described above, by applying a high AC voltage (AC power) to
the piezoelectric element 71, the diaphragm 70 can be sufficiently driven, and the piezoelectric
speaker 12 can reproduce sound in a wide band. . In addition, the piezoelectric speaker 12 can
be driven in a state where sufficient energy is supplied, and a sound having sufficient power can
be generated.
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[0044]
Also, the plastic magnet 50 is located at the opposite side of the induction coil 80 with the
bobbin 60 interposed therebetween. Therefore, interference between the induction coil 80 and
the plastic magnet 50 due to the approach between the induction coil 80 and the bobbin 60 too
much can be prevented. Therefore, the bobbin 60 can stably reciprocate, and does not disturb
the vibration of the large diameter speaker 11.
[0045]
In addition, when the dimension values of the thickness and height of the plastic magnet 50 are
not so large, the weight is also small. In this case, it is possible to suppress the influence on the
reproduction of the sound on the large diameter speaker 11 side. Thus, together with the
reproduction of the sound from the piezoelectric speaker 12, the sound quality can be improved
as a whole.
[0046]
Furthermore, since the plastic magnet 50 is closely opposed to the induction coil 80 and can
generate a high AC voltage to the induction coil 80, it is not necessary to fix the induction coil 80
to a magnetic material. Therefore, the induction coil 80 can be fixed to a nonmagnetic material
such as resin, for example. In addition, since it is not necessary to fix the induction coil 80 to the
magnetic material, the degree of freedom of the attachment position of the induction coil 80 is
also improved.
[0047]
In the case where the induction coil 80 is fixed to the magnetic material, the induction coil 80
can be caused to generate an electromagnetic induction also by the reciprocating motion of the
voice coil 62 as in the conventional case, and a higher AC voltage can be obtained. An induction
coil 80 can be produced.
[0048]
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In addition, since the ring-shaped plastic magnet 50 is used as the magnet, the magnet can be
strongly adhered to the bobbin 60 as compared with the case where the magnet such as iron is
directly adhered to the bobbin 60.
Further, the diaphragm 40 can be firmly adhered to the upper surface of the plastic magnet 50.
As described above, by bonding the diaphragm 40 to the bobbin 60 through the plastic magnet
50, the adhesion of the diaphragm 40 can be improved.
[0049]
Furthermore, the damper 61 can be adhered to the lower surface of the plastic magnet 50. As
described above, by bonding the damper 61 to the bobbin 60 through the plastic magnet 50, the
adhesive strength of the damper 61 can also be improved.
[0050]
Further, as shown in FIG. 4, so-called insert molding in which the induction coil 80 is provided in
advance inside the supporter 25 can also be performed. When configured in this manner, in the
manufacture of the speaker device 10, it is possible to reduce the number of parts at the time of
assembly. As a result, it is possible to reduce the number of assembling steps at the time of
manufacturing, and to reduce the cost.
[0051]
Second Embodiment Hereinafter, a second embodiment of the present invention will be described
based on FIGS. 5 to 7. In the present embodiment, the same components as those described in
the first embodiment above will be described with the same reference numerals.
[0052]
In the speaker device 100 according to the present embodiment shown in FIG. 5, a diaphragm
110 as shown in FIG. 6 is used. The diaphragm 110 is in a state in which the plastic magnet 120
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is insert-molded at the inner peripheral end portion 111. For this reason, the cross-sectional
shape of the plastic magnet 120 present at the inner peripheral end portion 111 is a middle
portion from one end side (upper end side) to the other end side (lower end side) so as to form a
substantially V shape. It has a bent shape with an obtuse angle.
[0053]
The plastic magnet 120 having a substantially V shape is formed of a neck portion 121 attached
to the bobbin 60 and an inclined portion 122 extending upward and outward from the neck
portion 121. It is configured. In FIG. 6, since the plastic magnet 120 constitutes the inner
peripheral side end portion 111 of the diaphragm 110, the inclined portion 122 is separated
from the bobbin 60 in comparison with the neck portion 121. The diaphragm 110 is bonded to
the bobbin 60 via the neck portion 121.
[0054]
Further, since the plastic magnet 120 constitutes the inner peripheral side end portion 111 of
the diaphragm 110, its thickness is thinner than that of the plastic magnet 50 in the first
embodiment described above.
[0055]
The plastic magnet 120 is a closed magnetic path type magnet which forms a closed magnetic
path between one end side (upper end side of the inclined portion 122) and the other end side
(lower end side of the neck portion 121).
In the present embodiment, the upper end side of the inclined portion 122 is magnetized so as to
be the N pole, and the lower end side of the neck portion 121 is the S pole. In this case, the upper
surface side of the upper end side of the inclined portion 122 is magnetized so that the N pole,
and the inner wall surface of the lower end side of the neck portion 121 becomes an S pole.
However, the entire upper end side of the inclined portion 122 may be magnetized to be the N
pole, and the entire lower end side of the neck portion 121 may be magnetized to be the S pole.
[0056]
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Here, the insert molding of the plastic magnet 120 is not limited to the configuration shown in
FIG. For example, as shown in FIG. 7, a thick plastic magnet 130 may be provided at the inner
peripheral end 111 of the diaphragm 110. In this case, the plastic magnet 120 is thicker than the
other parts of the diaphragm 110. When the thick-walled plastic magnet 130 is insert-molded, it
is not necessary to form the thin-walled plastic magnet 120 into a substantially V shape as in the
case of insert-molding. Further, in the case of a thick wall, it is possible to increase the magnetic
force.
[0057]
Incidentally, on the inner wall surface side of the plastic magnet 130 shown in FIG. 7, there is a
fitting recess 131 which is cut out from the lower side by a depth corresponding to the thickness
of the inner peripheral side end 61b of the damper 61. . The damper 61 can be adhered to the
bobbin 60 in a state where the inner peripheral end 61 b of the damper 61 is positioned in the
fitting recess 131.
[0058]
Further, in the configuration shown in FIG. 6, the inner circumferential end 61 b of the damper
61 is directly bonded to the bobbin 60. In addition, the inner peripheral end 61 b of the damper
61 is bonded to the bobbin 60 in a configuration in which the lower end of the neck portion 121
is substantially in contact. However, the attachment aspect of the inner peripheral side end 61 b
of the damper 61 is not limited to this. For example, the tip of the inner circumferential end 61 b
of the damper 61 may be bonded to the neck 121, and the tip of the inner circumferential end
61 b of the damper 61 may be bonded to a position away from the neck 121. You may
[0059]
In addition, regarding the induction coil 80, it becomes an attachment aspect similar to what was
described in the above-mentioned 1st Embodiment.
[0060]
The operation (operation) of the speaker device 100 having the above configuration will be
described below.
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[0061]
As described above, when the reciprocation of the bobbin 60 in the up and down direction is
started, the plastic magnet 120 fixed to the bobbin 60 is also reciprocated in the up and down
direction along with the start of the reciprocation. .
Then, also in this case, with the movement of the plastic magnet 120 in the vertical direction, the
induction coil 80 is in a state of generating electricity by electromagnetic induction, and an
alternating current flows in the conducting wire 81.
[0062]
Therefore, a large alternating current can be supplied to the conducting wire 81, and also in this
case, a high alternating voltage (AC power) can be applied to the piezoelectric element 71.
Therefore, as described above, the vibration of the piezoelectric element 71 is also in a state
sufficient to drive the diaphragm 70, the diaphragm 70 is driven by the strong vibration force,
and the high range (middle and high range) from the diaphragm 70 Is in a sufficient state.
[0063]
According to the speaker device 100 having such a configuration, the plastic magnet 120 is
provided integrally with the diaphragm 110. Therefore, as described in the first embodiment, in
addition to the effect of causing the induction coil 80 to generate electromagnetic induction, the
number of parts can be further reduced. In addition, by using the plastic magnet 120 mainly
composed of resin as the inner peripheral end 111 of the diaphragm 110, it is possible to
improve the adhesion of the diaphragm 110 to the bobbin 60.
[0064]
Further, since the plastic magnet 120 shown in FIG. 6 has the neck portion 121, the diaphragm
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110 can be reliably adhered to the bobbin 60 through the neck portion 121. As a result, it is
possible to prevent the occurrence of a problem that the diaphragm 110 is peeled off from the
bobbin 60.
[0065]
Furthermore, since the plastic magnet 130 shown in FIG. 7 has the fitting recess 131, the inner
peripheral end 61b of the damper 61 can be inserted in the mounting state of the plastic magnet
130 on the bobbin 60. Thereby, it is also possible to improve the adhesion of the damper 61 to
the bobbin 60.
[0066]
As mentioned above, although the 1st and 2nd embodiment of the present invention was
described, the present invention can be variously deformed besides this. Below, we will discuss
that.
[0067]
In the first embodiment described above, the plastic magnet 50 is provided separately from the
bobbin 60. However, the bobbin 60 itself may be formed of a plastic magnet whose main
component is resin. With such a configuration, it is possible to further reduce the number of
parts.
[0068]
In the first embodiment described above, the case where the plastic magnet 50 is used as the
magnet is described. However, the magnet is not limited to the plastic magnet 50. For example, a
ring-shaped magnet made of iron or the like may be used as the magnetic material. Further, the
ring-shaped magnet made of such iron or the like may be molded so as to be covered with resin.
Also, for example, an electromagnet may be used.
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[0069]
Furthermore, in the first embodiment described above, the case where the induction coil 80 is
fixed to the outer peripheral surface of the supporter 25 or the center pole portion 22 is
described. Moreover, in FIG. 4, the case where the plastic magnet is provided in the inside of the
supporter 25 is demonstrated. However, for example, the cross-sectional shape of the lower end
side of the supporter 25 may be formed in a pre-groove shape, and the inductor 25 may be
sandwiched by the supporter 25.
[0070]
Further, in the second embodiment described above, the case of using the plastic magnet 120
having a V-shaped cross section as shown in FIG. 6 is described. However, the plastic magnet
120 is not limited to a substantially V shape, and can be variously modified, for example, by
forming the plastic magnet located at the inner peripheral end 111 of the diaphragm 110 in a
substantially L shape.
[0071]
The speaker device of the present invention can be used in the fields of on-vehicle audio
equipment and home audio equipment. In addition, by incorporating a speaker device, it can be
used in the field of electric appliances such as television.
[0072]
FIG. 1 is a side cross-sectional view showing a configuration of a speaker device provided with a
piezoelectric speaker according to a first embodiment of the present invention. In the speaker
apparatus of FIG. 1, it is a sectional side view which expands and shows A part in which the
induction coil and the plastic magnet are provided. In the speaker apparatus of FIG. 1, it is a
sectional side view which expands and shows an example at the time of changing the attachment
site | part of a plastic magnet. In the speaker apparatus of FIG. 1, it is a sectional side view which
expands and shows an example at the time of changing the attachment site | part of an induction
coil and providing in the inside of a supporter. It is a sectional side view which shows the
structure of the speaker apparatus which comprises the piezoelectric type speaker which
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concerns on the 2nd Embodiment of this invention. In the speaker apparatus of FIG. 5, it is a
sectional side view which expands and shows the part in which the induction coil and the plastic
magnet are provided, and is a figure which shows the case where insert molding of the plastic
magnet is carried out to a diaphragm. FIG. 6 is an enlarged sectional side view showing a
modified example of the diaphragm and the plastic magnet in the speaker device of FIG. 5,
showing a case where a thick plastic magnet is insert-molded on the diaphragm. It is a sectional
side view which shows the structure of the speaker apparatus which comprises the conventional
piezoelectric type speaker.
Explanation of sign
[0073]
DESCRIPTION OF SYMBOLS 10, 100 ... Speaker apparatus 11 ... Large diameter speaker 12 ...
Piezoelectric speaker 20 ... Yoke 21 ... Disc part 22 ... Center pole part (a part of midway member)
23 ... Magnet 24 ... Plate 24a ... Center hole 25 ... Supporter (mid-way) 30 part of member 30
frame 31 lower bottom part 32 insertion hole 33 step part 34 flange part 35 edge 40, 70, 110
diaphragm 41 outer peripheral end 42 inner peripheral end 50 120, 130 ... Plastic magnet
(magnet) 60 ... Voice coil bobbin (bobbin) 61 ... Damper 62 ... Voice coil 71 ... Piezoelectric
element 80 ... Induction coil 81 ... Conducted wire 131 ... Mating recess
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