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DESCRIPTION JP2006340295

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DESCRIPTION JP2006340295
A speaker device capable of improving the heat radiation efficiency and the like is provided. A
center pole is formed in a substantially cylindrical shape and has a vent. The closing member has
a cylindrical portion or the like fitted in the vent. Therefore, by fitting the closing member to the
vent hole on one end side of the center pole, the closing member can be attached to the yoke in
the state where the vent hole is closed. When the closing member is attached to the yoke and the
vibration system is moved, a path for air flow in and out is generated between the internal space
of the speaker device and the external space, and the air comes in direct contact with the voice
coil. The heat dissipation effect of the voice coil can be enhanced. As a result, it is possible to
improve the thermal durability of the speaker device. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a heat dissipation structure and the like in a speaker device.
[0002]
Conventionally, a speaker device configured by including a vibration system having a diaphragm,
a voice coil bobbin and a voice coil, and a magnetic circuit having a yoke including a center pole
(or a pole), a magnet, a plate and a frame is known. .
[0003]
As this type of speaker device, for example, a speaker device in which an opening (or a through
hole) is provided at the center of a center pole to improve sound quality and heat radiation
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efficiency is known (see, for example, Patent Documents 1 to 5). ).
[0004]
Also, as this type of speaker device, for example, a subwoofer type speaker device capable of
changing the hole diameter of the yoke afterward is known (see, for example, Non-Patent
Document 1).
In the speaker device (for example, a product such as KAPPA PERFECT 12VQ SUBWOOFER)
described in Non-Patent Document 1, two cylindrical pole sleeves having different hole diameters
that can be attached and detached to the center pole of the yoke are provided. The selective use
in the state of being inserted in the hole of the center pole has an advantage that the Q (Quality
Factor) value can be changed after the fact.
[0005]
JP 2003-32791 JP JP 2003-299185 JP JP 2004-188698 JP JP 2003-304593 JP JP 8-317493
JP Internet <URL: http://www.infinitysystems.com/caraudio /products.aspx>
[0006]
However, in the speaker device in which the opening (or the through hole) is provided in the
center pole as described above, the amount of air directly in contact with the voice coil when the
vibration system vibrates is small.
Therefore, in such a speaker device, the heat generated in the voice coil is indirectly dissipated at
the contact portion between the magnetic circuit and the outside air.
As a result, there is a problem that the thermal durability of the speaker device is reduced.
[0007]
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2
As problems to be solved by the present invention, the above-mentioned ones can be mentioned
as an example.
An object of the present invention is to provide a speaker device capable of improving the heat
radiation efficiency and the like.
[0008]
The invention according to claim 1 is a speaker device, comprising a magnetic circuit having a
yoke including a center pole and a closing member, wherein the center pole is one end side of the
center pole and the other end opposite to the one end side It has a vent hole which penetrates a
side, and the closing member is characterized by being removably attached in the position which
blocks the vent hole of the center pole.
[0009]
In one aspect of the present invention, the speaker device includes a magnetic circuit having a
yoke including a center pole and a closing member, and the center pole includes one end of the
center pole and the other end opposite to the one end. It has a vent which penetrates, and the
closure member is removably attached in the position which closes the vent of the center pole.
[0010]
The above speaker device is configured to include the magnetic circuit having the yoke including
the center pole and the closing member.
This closing member is suitably used as an accessory of the speaker device.
The center pole has an air vent formed by penetrating one end side of the center pole and the
other end side opposite to the one end side. In particular, the closing member is removably
attached at a position closing the vent of the center pole. That is, the closing member has a
function of closing the vent hole of the center pole, and even after the closing member is
attached to the position where the vent hole of the center pole is closed, the closing member is
freed from the center pole afterward. Can be removed. In a preferred embodiment, the closing
member preferably includes a cylindrical portion fitted to the vent hole of the center pole, and a
flange portion extending outward from an outer peripheral wall of the cylindrical portion.
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[0011]
For this reason, the following effects and advantages are obtained when the speaker device is
driven, in the case where the closing member is attached to the magnetic circuit and in the case
where the closing member is not attached to the magnetic circuit. In addition to the magnetic
circuit and the closing member, this speaker device is a generally well-known component, for
example, a voice coil bobbin wound with a voice coil, a diaphragm and a cap (hereinafter referred
to as "vibration system member" It is preferable to have a frame, etc.).
[0012]
First, when the closing member is attached to the magnetic circuit in a state where the air hole at
the other end of the center pole is closed, assuming that the voice coil bobbin has moved to the
magnetic circuit side, the cap, the diaphragm, and the voice coil bobbin The space surrounded by
the yoke and the closing member (hereinafter referred to as "space E1" for the sake of
convenience) becomes smaller, and the air present in the space E1 is compressed. Therefore, a
part of the air present in the space E1 travels through the gap between the outer peripheral wall
of the center pole which is an element of the yoke and the inner peripheral wall of the voice coil
bobbin, and further through the air vents of the frame Discharged into
[0013]
Conversely, assuming that the voice coil bobbin has moved to the side of the diaphragm opposite
to the magnetic circuit, air present in the external space flows into the internal space of the
speaker device through the above-described path.
[0014]
By repeating such a series of operations / actions, air is directly and repeatedly contacted with
the voice coil, and the heat dissipation effect of the voice coil can be enhanced.
As a result, it is possible to improve the thermal durability of the speaker device. For this reason,
even in the case where the speaker device is driven with an output of a large volume in an SPL
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competition or the like to be described later, it is possible to prevent the speaker device from
being damaged due to the thermal effect. That is, this speaker device can configure a speaker
device that is highly adaptive to situations where thermal reliability is required more than the
sound quality, such as in SPL competition applications.
[0015]
On the other hand, when the closing member is separated from the magnetic circuit, assuming
that the voice coil bobbin has moved to the magnetic circuit side, the air present in the internal
space of the speaker device is not only the vent of the frame but also the center pole. It is
discharged to the outside space through the vent. On the other hand, assuming that the voice coil
bobbin has moved to the diaphragm side opposite to the magnetic circuit, the air present in the
external space flows into the internal space of the speaker device through the vent holes of the
frame and the center pole. For this reason, as compared with the case where the closing member
is attached to the magnetic circuit, the air flow connecting the space E1 and the external space
(i.e., the path mediated by the air vent of the center pole) is increased by the vibration. Since the
air resistance at the time of movement of the system member is reduced, the vibration system
member is easily vibrated, and the sound quality can be improved.
[0016]
As described above, in this speaker device, the closing member detachably mounted at the
position closing the vent hole of the center pole is provided, so that the closing member is
attached to the magnetic circuit or the closing member is detached from the magnetic circuit In
each case, the thermal durability of the speaker device can be improved by sacrificing the sound
quality to some extent (when installed), or conversely, the thermal durability of the speaker
device can be slightly sacrificed. It is possible to selectively use two states (modes) of improving
sound quality (when leaving) or according to time and place. The former mode is suitable when
using a speaker device for SPL competition, and the latter mode is suitable for normal listening,
that is, enjoying music.
[0017]
In one aspect of the above speaker device, the yoke includes a flange portion extending outward
from an outer peripheral wall of the center pole, and the magnetic circuit is disposed on the
flange portion and the center pole The magnet includes a magnet disposed at a position facing
the outer circumferential wall, a plate disposed on the magnet, and a frame having a vent, and
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the plate has a groove on the side in contact with the magnet. The groove connects the space
between the center pole and the magnet and the vent of the frame.
[0018]
In this aspect, the yoke includes a flange portion extending outward from the outer peripheral
wall of the center pole.
The magnetic circuit comprises a magnet disposed on the flange portion of the yoke and
disposed at a position facing the outer peripheral wall of the center pole, a plate disposed on the
magnet, and a frame having a vent. ing. In addition, the plate has a groove on the side in contact
with the magnet, and the groove connects the space between the center pole and the magnet and
the vent of the frame. Hereinafter, for convenience, this aspect will be referred to as a first
aspect.
[0019]
Thus, in the first aspect, the flow path of air (the path passing through the groove of the plate)
connecting the internal space of the speaker device and the external space is increased as
compared with the speaker device having the above configuration. Therefore, when the vibration
system member is driven in a state in which the closing member is separated from the magnetic
circuit, when the vibration system member is moved compared to the speaker device having the
above configuration by the amount of the increased path. Since the air resistance is reduced, the
vibration system member is more easily vibrated, and the sound quality is improved as compared
with the speaker device having the above configuration. When the vibration system member is
driven when the closing member is attached to the magnetic circuit in a state where the vent hole
on the other end side of the center pole is closed, the outer peripheral wall of the voice coil is
increased by the above-mentioned increased path. Since the air velocity and the like when
passing through the nearby gap become nonuniform, the thermal durability is slightly reduced as
compared with the speaker device having the above configuration.
[0020]
In another aspect of the above speaker device, the frame includes an opening having a diameter
larger than the vent hole of the center pole on the other end side of the center pole, and the
center pole includes the center pole and the magnet. And another vent connecting the space
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between them and the opening.
[0021]
In this aspect, the frame has an opening on the other end of the center pole that has a larger
diameter than the vents of the center pole.
And, the center pole has another vent connecting the space between the center pole and the
magnet and the opening of the frame. Hereinafter, for convenience, this aspect will be referred to
as a second aspect.
[0022]
Thereby, in the second aspect, the flow path of air (path passing through the other vent holes of
the center pole) connecting the inner space and the outer space of the speaker device is
increased as compared with the first aspect. Therefore, when the vibration system member is
driven in a state in which the closing member is separated from the magnetic circuit, the air
resistance at the time of movement of the vibration system member is smaller than that in the
first mode by the increased path. Therefore, the vibration system member is more easily vibrated,
and the sound quality is improved as compared with the first aspect. When the vibration system
member is driven when the closing member is attached to the magnetic circuit in a state where
the vent hole on the other end side of the center pole is closed, the outer peripheral wall of the
voice coil is increased by the above-mentioned increased path. Since the air velocity and the like
when passing through the nearby gap become nonuniform, the thermal durability is slightly
reduced as compared with the first embodiment.
[0023]
In another aspect of the above speaker device, a voice coil bobbin disposed at a position covering
at least a part of the outer peripheral wall of the center pole, a diaphragm attached to the outer
peripheral wall of the voice coil bobbin, and the voice coil bobbin The vibration system member
includes a cap disposed at a position closing the upper end and attached to the diaphragm, and
the outer peripheral wall of the center pole includes the cap, the diaphragm, and the voice coil
bobbin. A groove connecting the space between the peripheral wall and the inner peripheral wall
of the center pole and the space between the center pole and the magnet is formed.
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[0024]
In this aspect, the voice coil bobbin disposed at a position covering at least a part of the outer
peripheral wall of the center pole, the diaphragm attached to the outer peripheral wall of the
voice coil bobbin, and a position closing the upper end of the voice coil bobbin And a vibrating
system member having a cap disposed and mounted on the diaphragm.
Then, on the outer peripheral wall of the center pole, there is formed a groove connecting the
space between the cap, the diaphragm, the inner peripheral wall of the voice coil bobbin, the
inner peripheral wall of the center pole, and the space between the center pole and the magnet It
is done. Hereinafter, for convenience, this aspect will be referred to as a third aspect.
[0025]
Thus, in the third aspect, the flow path of air (path passing through the groove in the outer
peripheral wall of the center pole) connecting the internal space of the speaker device and the
external space is increased as compared to the second aspect. Therefore, when the vibration
system member is driven in a state in which the closing member is separated from the magnetic
circuit, the air resistance at the time of movement of the vibration system member is smaller
compared to the second mode by the amount of the increased path. Therefore, the vibration
system member is more easily vibrated, and the sound quality is improved as compared with the
second aspect. When the vibration system member is driven when the closing member is
attached to the magnetic circuit in a state where the vent hole on the other end side of the center
pole is closed, the outer peripheral wall of the voice coil is increased by the above-mentioned
increased path. Since the air velocity and the like at the time of passing through the nearby gap
become nonuniform, the thermal durability slightly decreases compared to the second
embodiment.
[0026]
In another aspect of the above speaker device, the diaphragm may include a space between the
cap, the diaphragm, an inner peripheral wall of the voice coil bobbin, and an inner peripheral
wall of the center pole, and the through of the frame. It has a vent that connects it to the pores.
[0027]
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In this aspect, the diaphragm has a vent that connects the space between the cap, the diaphragm,
the inner peripheral wall of the voice coil bobbin, the inner peripheral wall of the center pole, and
the vent of the frame.
Hereinafter, for convenience, this aspect will be referred to as a fourth aspect.
[0028]
Thus, in the fourth aspect, the flow path of air (path passing through the vent of the diaphragm)
connecting the internal space and the external space of the speaker device is increased as
compared to the third aspect. Therefore, when the vibration system member is driven in a state
in which the closing member is separated from the magnetic circuit, the air resistance at the time
of movement of the vibration system member is smaller than that in the third mode by the
increased path. Therefore, the vibration system member is more easily vibrated, and the sound
quality is improved as compared with the third aspect. When the vibration system member is
driven when the closing member is attached to the magnetic circuit in a state where the vent hole
on the other end side of the center pole is closed, the outer peripheral wall of the voice coil is
increased by the above-mentioned increased path. Since the air velocity and the like when
passing through the nearby gap become nonuniform, the thermal durability is slightly reduced
compared to the third embodiment.
[0029]
In another aspect of the above speaker device, in the voice coil bobbin, a space between the cap,
the diaphragm, an inner peripheral wall of the voice coil bobbin, and an inner peripheral wall of
the center pole, and the frame It has a vent connected to the vent.
[0030]
In this aspect, the voice coil bobbin has a vent that connects the cap, the diaphragm, the inner
peripheral wall of the voice coil bobbin, the space between the inner peripheral wall of the center
pole, and the vent of the frame.
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Hereinafter, for convenience, this aspect is referred to as a fifth aspect.
[0031]
Thus, in the fifth aspect, the flow path of air (the path passing through the air hole of the voice
coil bobbin) connecting the internal space of the speaker device and the external space is
increased as compared to the fourth aspect. Therefore, when the vibration system member is
driven in a state in which the closing member is separated from the magnetic circuit, the air
resistance at the time of movement of the vibration system member is smaller than that in the
fifth mode by the amount of the increased path. Therefore, the vibration system member is more
easily vibrated, and the sound quality is improved as compared with the fourth aspect. When the
vibration system member is driven when the closing member is attached to the magnetic circuit
in a state where the vent hole on the other end side of the center pole is closed, the outer
peripheral wall of the voice coil is increased by the above-mentioned increased path. Since the air
velocity and the like at the time of passing through the nearby gap become nonuniform, the
thermal durability slightly decreases compared to the fourth embodiment.
[0032]
Various preferred embodiments of the present invention will be described below with reference
to the drawings.
[0033]
First Embodiment (Configuration of Speaker Device) First, the configuration and the like of a
speaker device according to a first embodiment of the present invention will be described with
reference to FIGS. 1 and 2 and the like.
[0034]
FIG. 1 is a half sectional view showing the configuration of the speaker device according to the
first embodiment.
FIG. 2 (a) is a plan view showing the configuration of the closing member 30 which is a
component of the speaker device 100 characterizing the present invention, and a plane of the
closing member 30 as viewed in the direction of arrow Y2 in FIG. FIG.
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FIG. 2 (b) is a cross-sectional view of the closure member 30 taken along the cutting line AA 'in
FIG. 2 (a) and is a cross-sectional view as cut along a plane passing through the center O of the
closure member 30. is there.
[0035]
The speaker device 100 is a subwoofer type speaker device suitable for applications such as SPL
(Sound Pressure Level) competition, and mainly includes the yoke 1, the first magnet 2a, the
second magnet 2b, the third magnet 2c, the plate 3 and the like. A magnetic circuit having a
frame 4, a voice coil bobbin 5, a voice coil 6, a first damper 11a, a second damper 11b, a
diaphragm 15, an edge 16, a cap 17, and a vibration system having a plurality of constituent
members And a closing member 30 separately provided. Here, the plurality of constituent
members include the first annular member 7, the second annular member 9, the third annular
member 10, the fourth annular member 12, the mesh-like member 8, and the like.
[0036]
The official name of "SPL competition" is called "dB Drag Racing", and "SPL competition" means
the loudest sound for anyone's vehicle stereo (SPL). Is a competition to compete for In this
competition, a subwoofer-type speaker is used because there is a rule that a band of 80 Hz or
less must be used. The competition will also consist of several competitions, the final competition
being held in Nashville, USA at the end of October each year. In order to take part in the final
tournament, we will have participated in several small tournaments by October, and we will have
to save points to qualify. In addition, please refer to the homepage on the Internet (address;
"http://www.termpro.com/dbdrag/promoters") for details such as the rules of the competition.
[0037]
First, the configuration of the magnetic circuit will be described. The present magnetic circuit is
configured as an external magnet type magnetic circuit.
[0038]
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The yoke 1 has a center pole 1a having a substantially cylindrical shape, and a flange portion 1b
extending outward from the lower end of the outer peripheral wall of the center pole 1a (see also
FIGS. 6 and 7, however, In one embodiment, a plurality of vent holes 1c are not provided in FIGS.
The center pole 1a has a substantially cylindrical shape as described above, and has a vent 1ab
penetrating from the one surface side to the opposite surface side. On the lower surface of the
flange portion 1b, a plurality of recesses 1ba and a plurality of screw holes 1bb are provided.
Each recess 1ba is provided at an appropriate interval in the circumferential direction of the
flange portion 1b, and each screw hole 1bb is provided at a substantially central position of the
each recess 1ba. On the other hand, on the flange portion 1b, an annular first magnet 2a is
provided. A second magnet 2b having an annular shape is provided on the first magnet 2a, and a
third magnet 2c having an annular shape is provided on the second magnet 2b. The first magnet
2a, the second magnet 2b, and the third magnet 2c have the same shape and form, respectively.
A plate 3 having a substantially annular shape is provided on the third magnet 2c (see also FIG.
4; however, in the first embodiment, a plurality of grooves 3d are not provided in FIG. 4). . A
through hole 3 c is provided at a substantially central position of the plate 3. A plurality of screw
holes 3 a are provided in the vicinity of the outer peripheral portion of the lower surface of the
plate 3, and a plurality of screw holes 3 b are provided in the vicinity of the approximate center
of the upper surface of the plate 3. The screw holes 3 a and 3 b are provided at appropriate
intervals in the circumferential direction of the plate 3. The outer peripheral wall of the center
pole 1a faces the inner peripheral walls of the first magnet 2a, the second magnet 2b and the
third magnet 2c, and the plate 3, and between the inner peripheral wall of the plate 3 and the
outer peripheral wall of the center pole 1a. A magnetic gap 20 is formed on the side wall.
[0039]
The frame 4 has a function of supporting various components of the speaker device 100. The
frame 4 has a substantially cup-like shape, and an opening 4a and a first flange portion 4b
provided on the lower side, and a second flange portion 4c provided in the vicinity of the central
portion and having a plurality of screw holes 4ca A third flange 4d provided on the upper side
thereof and a plurality of openings 4e provided between the second flange 4c and the third
flange 4d.
[0040]
The opening 4a has a circular shape, and the diameter thereof is formed larger than the diameter
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of the vent hole 1ab of the center pole 1a. A plurality of convex portions 4 ba are provided on the
first flange portion 4 b at appropriate intervals in the circumferential direction, and screw holes
4 bb are provided at positions substantially corresponding to the centers of the respective
convex portions 4 ba. It is provided. The respective convex portions 4 ba of the frame 4 are fitted
in the respective concave portions 1 ba of the yoke 1, and in the order of the screw holes 4 bb of
the frame 4 and the screw holes 1 bb of the yoke 1 from the lower side of the frame 4. The first
flange portion 1 b of the yoke 1 is mounted on the first flange portion 4 b of the frame 4 in a
state where the No. 25 is inserted.
[0041]
The first annular member 7 has a function of supporting the outer peripheral portion of the first
damper 11 a and the wires 14 connected to the positive and negative output terminals on the
amplifier side. The first annular member 7 has an annular shape and has a first flange portion 7a
and a second flange portion 7b. The first flange portion 7a is provided with a plurality of screw
holes 7ab at appropriate intervals in the circumferential direction. The first flange portion 7a is
disposed on the plate 3 in a state where the respective screw holes 7ab and the respective screw
holes 3b of the corresponding plate 3 are aligned. The first flange 7a and the plate 3 are inserted
with the bolts 25 inserted in the order of the screw holes 7ab of the first flange 7a and the screw
holes 3b of the plate 3 from the first flange 7a side. , Are fastened together by the respective
bolts 25. Thereby, the first annular member 7 is fixed on the plate 3. The mesh-like member 8 is
disposed between the first flange 7a and the second flange 7b. A plurality of openings 7ba are
provided at appropriate positions of the second flange 7b. Each opening 7 ba has a function of
fixing each connector 14 a provided on one end side of each wiring 14 connected to the
amplifier side. That is, each connector 14a is fixed in each of the openings 7ba in a state where a
part of the connector 14a is inserted into each of the openings 7ba.
[0042]
Next, the configuration of the vibration system will be described.
[0043]
The voice coil bobbin 5 vibrates together with the voice coil 6 according to the input signal, and
has a function of transmitting the vibration to the diaphragm 15.
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The voice coil bobbin 5 has a substantially cylindrical shape and is disposed at a position
covering the vicinity of the upper end portion of the center pole 1 a which is an element of the
yoke 1.
[0044]
The voice coil 6 has positive and negative lead wires (not shown), and is wound around the lower
end of the outer peripheral wall of the voice coil bobbin 5. The lead wire on the positive side is
an input wiring of the L (or R) channel signal, and the lead wire on the negative side is an input
wiring of the ground (GND: ground) signal. The positive and negative lead wires are connected to
one end of the corresponding tinsel wire 13 in the vicinity of the upper end of the voice coil
bobbin 5. A connector 13 a is provided on the other end side of each tinsel cord 13. Each
connector 13 a is engaged with each connector 14 a of each wire 14 in the second flange portion
7 b which is an element of the first annular member 7. Therefore, the lead wires on the positive
side and the negative side of the voice coil 6 are electrically connected to the wires 14 through
the tinsel wires 13. As a result, signals and power for one channel are input to the voice coil 6
from the amplifier side via the wires 14 and the tinsel wires 13 and the positive and negative
lead wires.
[0045]
The second annular member 9 has a function of supporting the inner peripheral portion of the
first damper 11 a together with the voice coil bobbin 5. The second annular member 9 has an
annular shape, and is attached near the approximate center of the outer peripheral wall of the
voice coil bobbin 5 via an adhesive element (not shown).
[0046]
The first damper 11 a and the second damper 11 b have elastic portions having a substantially
annular shape, and a plurality of concentric wave shapes (corrugations) formed thereon, and
elastically support the voice coil bobbin 5. The inner peripheral edge portion of the first damper
11a is mounted on the second annular member 9 and near the approximate center of the outer
peripheral wall of the voice coil bobbin 5 via an adhesive element (not shown). On the other
hand, the outer peripheral edge portion of the first damper 11 a is mounted on the second flange
portion 7 b which is an element of the first annular member 7. A third annular member 10
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having an annular shape is attached on the inner peripheral edge of the first damper 11 a and in
the vicinity of the upper end of the outer peripheral wall of the voice coil bobbin 5. On the other
hand, a fourth annular member 12 having an annular shape is attached on the outer peripheral
edge portion of the first damper 11a. The thickness of the fourth annular member 12 (thickness
in the central axis L1 direction) is substantially the same as the thickness of the third annular
member 10 (thickness in the central axis L1 direction). The inner peripheral edge portion of the
second damper 11 b is mounted on the third annular member 10 and in the vicinity of the upper
end portion of the outer peripheral wall of the voice coil bobbin 5. On the other hand, the outer
peripheral edge portion of the second damper 11 b is mounted on the fourth annular member
12.
[0047]
The diaphragm 15 has a cone shape, and has a function of emitting a sound wave corresponding
to the input signal in the direction of the arrow Y1. The inner peripheral edge portion of the
diaphragm 15 is attached to the upper side of the second damper 11 b and in the vicinity of the
upper end portion of the outer peripheral wall of the voice coil bobbin 5.
[0048]
The edge 16 has an Ω-shaped cross-sectional shape and an annular planar shape, and has a
function of absorbing unnecessary vibration and the like generated in the speaker device 100.
The inner peripheral edge of the edge 16 is attached to the outer peripheral edge of the
diaphragm 15, while the outer peripheral edge of the edge 16 is attached on the third flange 4 d
which is an element of the frame 4.
[0049]
The cap 17 has a dome shape, and has a function of preventing dust and the like from intruding
into the inside of the speaker device 100. The cap 17 is disposed at a position covering the upper
surface side of the voice coil bobbin 5 and is attached near the center of the upper surface side of
the diaphragm 15.
[0050]
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15
The closing member 30 is a member that is a feature of the present invention, and is an attached
member that can be detachably attached to the lower surface side of the yoke 1. The closure
member 30 can be made of various known materials such as metal and resin. As shown in FIGS.
2A and 2B, the closing member 30 has a substantially inverted T-shaped cross-sectional shape,
and a cylindrical portion 30a having a substantially cylindrical shape, and an outer peripheral
wall of the cylindrical portion 30a. And a flange 30b extending outward from the lower end. The
diameter D1 of the cylindrical portion 30a is formed to be slightly smaller than the diameter of
the vent hole 1ab of the yoke 1. In order to attach the closing member 30 to the yoke 1, it is
performed as follows. That is, the cylindrical portion 30a is inserted into and fitted in the vent
hole 1ab on the lower surface side of the center pole 1a until the upper surface of the flange
portion 30b contacts the lower surface of the flange portion 1b. Thus, the vent holes 1ab of the
yoke 1 are closed by the cylindrical portion 30a of the closing member 30. Thus, the state where
the closing member 30 is attached to the lower surface side of the center pole 1a is shown in FIG.
[0051]
In the speaker device 100 having the above configuration, a signal or power is input to the voice
coil 6 through the lead wires 14 on each side of the amplifier, the tinsel wires 13, and the voice
coil 6 so that the magnetic gap 20 is formed. As a result, a driving force is generated in the voice
coil 6, and the diaphragm 15 is vibrated in the direction of the central axis L1 of the speaker
device 100 (the direction of the arrows Y1 and Y2). Thus, the speaker device 100 emits a sound
wave in the direction of the arrow Y1.
[0052]
Next, the function and effect of the speaker device 100 according to the first embodiment of the
present invention will be described.
[0053]
In particular, in the first embodiment of the present invention, the yoke 1 has the function of
closing the vent holes 1ab of the yoke 1, and the yoke 1 is provided with the removable closing
member 30.
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In other words, the closing member 30 is detachably attached at a position where the vent hole
1ab of the center pole 1a is closed. Therefore, when the speaker device 100 is driven with the
blocking member 30 attached to the yoke 1 and when the speaker device 100 is driven with the
blocking member 30 not attached to the yoke 1, the following specific characteristics are
obtained. It exerts an action effect.
[0054]
First, when the speaker device 100 is driven in a state in which the closing member 30 is
attached to the yoke 1, the following effects can be obtained.
[0055]
That is, as shown in FIG. 1, assuming that the voice coil bobbin 5 or the like moves in the
direction of arrow Y2 when driving the speaker device 100, the lower surface of the cap 17, the
upper surface of the diaphragm 15, and the voice coil bobbin 5 A space E1 surrounded by the
peripheral wall and the like, the inner peripheral wall and the like of the yoke 1 and the upper
surface of the closing member 30 becomes smaller, and the air present in the space E1 is
compressed.
Therefore, a part of the air present in the space E1 travels in the direction of the arrow Y3
through the gap between the outer peripheral wall of the center pole 1a which is an element of
the yoke 1 and the inner peripheral wall of the voice coil bobbin 5 It is discharged to a space E2
surrounded by the outer peripheral wall of the center pole 1a and the inner peripheral walls of
the magnets 2a, 2b and 2c. Subsequently, part of the air discharged into the space E2 travels
through the gap between the outer peripheral wall of the voice coil 6 and the inner peripheral
wall of the plate 3 in the direction of the arrow Y4, and with the lower surface of the first damper
11a. The air is discharged into a space E3 surrounded by the upper surface of the first annular
member 7, the outer peripheral wall of the voice coil bobbin 5, and the like. Subsequently, part of
the air discharged into the space E3 travels in the direction of the arrow Y6 and is discharged to
the external space of the speaker device 100 through the air holes 4e of the frame 4. That is, this
causes a flow of air from the arrow Y3 to the arrow Y6 via the arrow Y4 and the arrow Y5. In the
following, the flow path of air from the arrow Y3 to the arrow Y6 via the arrow Y4 and the arrow
Y5, or the opposite path thereof, is also referred to as a “path K1”.
[0056]
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17
Conversely, assuming that the voice coil bobbin 5 has moved in the direction of the arrow Y1, the
air existing in the external space flows into the internal space of the speaker device 100 through
the above-described path K1, so the space E1 becomes large. . That is, in this case, air flows from
the arrow Y3 to the arrow Y6 via the arrow Y4 and the arrow Y5 in the opposite direction.
[0057]
By repeating such a series of operations / actions, air is directly and repeatedly contacted with
the voice coil 6, and the heat radiation effect of the voice coil 6 can be enhanced. As a result, the
thermal durability of the speaker device 100 can be improved. Therefore, even when the speaker
device 100 is driven with a large volume output in the above-described SPL competition or the
like, the speaker device 100 can be prevented from being damaged or the like due to the abovedescribed operation. That is, the speaker device 100 according to the first embodiment can
configure a speaker device with high adaptability to a scene where thermal reliability is required
more than the sound quality, such as in SPL competition applications. When the closing member
30 is attached to the yoke 1, the air resistance at the time of movement of the vibration system is
higher than when the closing member 30 is not attached, so that the vibration system becomes
difficult to operate and the sound quality is slightly deteriorated.
[0058]
Next, when the speaker device 100 is driven in a state in which the closing member 30 is
removed from the yoke 1, the following effects can be obtained.
[0059]
That is, assuming that the voice coil bobbin 5 or the like has moved in the direction of arrow Y2,
the air existing in the internal space of the speaker device 100 passes not only through the vents
4e of the frame 4 but also through the vents 1ab of the yoke 1. And discharged to the outside
space.
On the other hand, assuming that the voice coil bobbin 5 or the like has moved in the direction of
the arrow Y1, air existing in the external space flows into the internal space of the speaker device
100 through the air holes 4e and the air holes 1ab. Therefore, as compared with the case where
12-04-2019
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the closing member 30 is attached to the yoke 1, the amount of the air flow path connecting the
space E1 and the external space (that is, the path through the air hole 1ab of the yoke 1) is
increased. Since the air resistance at the time of movement of the vibration system is reduced,
the vibration system is easily vibrated, and the sound quality can be improved.
[0060]
As described above, the speaker device 100 according to the first embodiment has the function
of closing the vent holes 1 ab of the yoke 1 and the yoke 1 is provided with the removable
closing member 30. The thermal durability of the speaker device 100 can be improved (when
worn) by sacrificing the sound quality to some extent by attaching or detaching the closing
member 30, or vice versa. The two states (modes) of selectively improving the sound quality of
the speaker device 100 (when leaving the speaker device 100) at a slight expense can be
selectively used according to the time and the place. The former mode is suitable when using the
speaker device 100 for SPL competition, and the latter mode is suitable for a normal listening
state, that is, a state of enjoying music.
[0061]
Second Embodiment Next, the configuration and the like of a speaker device 200 according to a
second embodiment of the present invention will be described with reference to FIGS. 3 and 4. In
the following, the same elements as those of the first embodiment are denoted by the same
reference numerals, and the description thereof is omitted or simplified.
[0062]
FIG. 3 is a half sectional view showing the configuration of the speaker device 200 according to
the second embodiment. FIG. 4 (a) is a plan view showing the configuration of the plate 3
according to the second embodiment when observed in the direction of the arrow Y2 in FIG. FIG.
4 (b) shows a cross-sectional view along the cutting line B-B 'in FIG. 4 (a). FIG. 4 (c) shows a
cross-sectional view along cutting line C-C 'in FIG. 4 (a).
[0063]
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19
When the second embodiment and the first embodiment are compared, only the configuration of
the plate 3 is slightly different. That is, in the second embodiment, a plurality of grooves 3d are
provided on the lower surface 3x side of the plate 3 according to the first embodiment, which is
different from the first embodiment. Specifically, as shown in FIG. 4, on the lower surface 3 x side
of the plate 3, a plurality of grooves 3 d having a rectangular planar shape are formed from the
inner peripheral wall of the plate 3 to the outer peripheral wall of the plate 3 There is. The
grooves 3 d are formed at appropriate intervals in the circumferential direction of the plate 3. In
the second embodiment, the shape, the set number, the set position, and the like of each groove
3d are not particularly limited.
[0064]
A state in which the plate 3 having such a configuration is mounted on the third magnet 2c is
shown in FIG.
[0065]
In the speaker device 200 according to the second embodiment, since the plurality of grooves 3
d are provided in the plate 3, when the speaker device 200 is driven in a state where the closing
member 30 is attached to the yoke 1, In the case where the speaker device 200 is driven in a
state in which the member 30 is not attached, the following unique operation and effects are
achieved.
[0066]
First, when the speaker device 200 is driven in a state in which the closing member 30 is
attached to the yoke 1, the following effects can be obtained.
[0067]
That is, as shown in FIG. 3, when it is assumed that the voice coil bobbin 5 and the like move in
the direction of arrow Y2 when the speaker device 200 is driven, the space E1 becomes smaller
and the air present in the space E1 is compressed.
Therefore, a part of the air present in the space E1 travels in the direction of the arrow Y3
through the gap between the outer peripheral wall of the center pole 1a which is an element of
the yoke 1 and the inner peripheral wall of the voice coil bobbin 5 It is discharged to space E2.
12-04-2019
20
Subsequently, a part of the air discharged into the space E2 travels in the direction of the arrow
Y4 through the gap between the outer peripheral wall of the voice coil 6 and the inner peripheral
wall of the plate 3 and is discharged into the space E3. At the same time, it advances in the
direction of arrow Y 7 in the plurality of grooves 3 d of the plate 3 and is discharged to the
external space.
Subsequently, a part of the air discharged into the space E3 is discharged to the external space of
the speaker device 200 through the air holes 4e of the frame 4. In the following, the flow path of
air from the arrow Y3 to the arrow Y7 via the arrow Y4 or the opposite path is also referred to as
a “path K2”. That is, this gives rise to two air flow paths, ie, paths K1 and K2. Conversely,
assuming that the voice coil bobbin 5 has moved in the direction of arrow Y1, the air existing in
the external space flows into the internal space of the speaker device 200 through the paths K1
and K2 described above. growing.
[0068]
By repeatedly performing such a series of operations / actions, the heat radiation effect of the
voice coil 6 is promoted as in the first embodiment, and the thermal durability of the speaker
device 200 can be improved. However, in the second embodiment, the speed of air when passing
through the gap near the outer peripheral wall of the voice coil 6 at the time of driving the
speaker device 200 is not equal to the increase of the path K2 compared to the first embodiment.
Become uniform. For this reason, the thermal durability of the speaker device 200 is slightly
reduced compared to the first embodiment.
[0069]
Next, when the speaker device 200 is driven in a state in which the closing member 30 is
removed from the yoke 1, the following effects can be obtained.
[0070]
That is, assuming that the voice coil bobbin 5 or the like has moved in the direction of arrow Y2,
the air existing in the internal space of the speaker device 200 is the grooves 3d of the plate 3,
the air holes 4e of the frame 4 and the air holes of the yoke 1 It is discharged to the external
12-04-2019
21
space through 1ab.
On the other hand, assuming that the voice coil bobbin 5 or the like has moved in the direction of
arrow Y1, air existing in the external space flows into the internal space of the speaker device
200 through the grooves 3d, the vents 4e and the vents 1ab. . For this reason, in the second
embodiment, since the air resistance at the time of movement of the vibration system is smaller
than that in the first embodiment by the increase of the path K2 in comparison with the first
embodiment, the vibration system is further enhanced. It becomes easy to vibrate, and the sound
quality is improved as compared with the first embodiment. The other functions and effects of
the second embodiment are similar to those of the first embodiment.
[0071]
Third Embodiment Next, the configuration and the like of a speaker device 300 according to a
third embodiment of the present invention will be described with reference to FIGS. 5 to 7. In the
following, the same elements as those in the first and second embodiments are denoted by the
same reference numerals, and the description thereof is omitted or simplified.
[0072]
FIG. 5 is a half sectional view showing the configuration of the speaker device 300 according to
the third embodiment. FIG. 6 is a plan view showing the configuration of the yoke 1 according to
the third embodiment as viewed in the direction of the arrow Y2 in FIG. FIG. 7 (a) shows a crosssectional view along cutting line D-D 'in FIG. FIG. 7 (b) shows a cross-sectional view along the
cutting line E-E 'in FIG.
[0073]
When the third embodiment and the second embodiment are compared, only the configuration of
the yoke 1 is different. That is, in the third embodiment, a plurality of vent holes 1c are provided
in the vicinity of the lower end portion of the center pole 1a of the yoke 1 according to the
second embodiment, and this point is different from the second embodiment. As illustrated, the
vent holes 1c are formed at appropriate intervals in the circumferential direction of the center
pole 1a. In the third embodiment, there is no limitation on the shape, the number of setting and
12-04-2019
22
the setting position of each vent 1c.
[0074]
A state in which the yoke 1 having such a configuration is attached to the frame 4 is shown in
FIG.
[0075]
In the speaker device 300 according to the third embodiment, a plurality of air holes 1 c are
provided in the yoke 1. Therefore, when the speaker device 300 is driven in a state where the
closing member 30 is attached to the yoke 1. In the case where the speaker device 300 is driven
in a state in which the closing member 30 is not attached, the following specific effects are
achieved.
[0076]
First, when the speaker device 300 is driven in a state in which the closing member 30 is
attached to the yoke 1, the following effects can be obtained.
[0077]
That is, as shown in FIG. 5, assuming that the voice coil bobbin 5 and the like move in the
direction of arrow Y2 when driving the speaker device 300, the space E1 becomes smaller, and
the air present in the space E1 is compressed.
Therefore, a part of the air present in the space E1 travels in the direction of the arrow Y3
through the gap between the outer peripheral wall of the center pole 1a which is an element of
the yoke 1 and the inner peripheral wall of the voice coil bobbin 5 It is discharged to space E2.
Subsequently, part of the air discharged into the space E2 is discharged into the space E3
through the gap between the outer peripheral wall of the voice coil 6 and the inner peripheral
wall of the plate 3 in the arrow Y4 direction. The plurality of grooves 3d of the plate 3 travels in
the direction of arrow Y7 and is discharged to the external space, and further, the plurality of
vents 1c of the yoke 1 travels in the direction of arrow Y8 and is discharged to the external
space.
12-04-2019
23
Subsequently, a part of the air discharged into the space E3 is discharged to the external space of
the speaker device 300 through the vents 4e of the frame 4. In the following, the flow path of the
air from the arrow Y3 to the arrow Y8 or the opposite path is also referred to as "path K3". In
other words, this gives rise to three air flow paths, namely paths K1, K2 and K3. Conversely,
assuming that the voice coil bobbin 5 has moved in the direction of the arrow Y1, air existing in
the external space flows into the internal space of the speaker device 300 through the paths K1,
K2 and K3 described above. E1 becomes large.
[0078]
By repeating such a series of operations / actions, the heat radiation effect of the voice coil 6 is
promoted as in the first and second embodiments, and the thermal durability of the speaker
device 300 can be improved. . However, in the third embodiment, the speed of air when passing
through the gap near the outer peripheral wall of the voice coil 6 at the time of driving the
speaker device 300 is not equal to the increase of the path K3 compared to the second
embodiment. Become uniform. For this reason, compared with the second embodiment, the
thermal durability of the speaker device 300 is slightly reduced.
[0079]
Next, when the speaker device 300 is driven in a state in which the closing member 30 is
removed from the yoke 1, the following effects can be obtained.
[0080]
That is, assuming that the voice coil bobbin 5 or the like has moved in the direction of the arrow
Y2, the air existing in the internal space of the speaker device 300 passes through the grooves
3d of the plate 3, the air holes 4e of the frame 4, and the yoke 1 The air is discharged to the
external space through the pores 1ab and the vents 1c.
On the other hand, assuming that the voice coil bobbin 5 etc. has moved in the direction of arrow
Y1, the air present in the external space passes through the grooves 3d, the air holes 4e, the air
holes 1ab and the air holes 1c. It flows into the inner space. For this reason, in the third
embodiment, since the air resistance at the time of movement of the vibration system is smaller
than that in the second embodiment by the increase of the path K3 in comparison with the
12-04-2019
24
second embodiment, the vibration system is further enhanced. It becomes easy to vibrate and the
sound quality is improved compared to the second embodiment. The remaining effects of the
third embodiment are similar to those of the first embodiment.
[0081]
Fourth Embodiment Next, the configuration and the like of a speaker device 400 according to a
fourth embodiment of the present invention will be described with reference to FIGS. 8 and 9. In
the following, the same elements as those in the first to third embodiments are given the same
reference numerals, and the description thereof will be omitted or simplified.
[0082]
FIG. 8 is a half sectional view showing the configuration of the speaker device 400 according to
the fourth embodiment. FIG. 9A is a plan view showing the configuration of the yoke 1 according
to the fourth embodiment as viewed in the direction of the arrow Y2 in FIG. FIG. 9 (b) shows a
cross-sectional view taken along the cutting line F-F 'in FIG. 9 (a).
[0083]
When the fourth embodiment and the third embodiment are compared, only the configuration of
the yoke 1 is different. That is, in the fourth embodiment, a plurality of grooves 1ac are provided
on the outer peripheral wall of the center pole 1a of the yoke 1 according to the third
embodiment, which is different from the third embodiment. As illustrated, the grooves 1ac are
formed at appropriate intervals in the circumferential direction of the center pole 1a. In the
fourth embodiment, there is no limitation on the shape of each groove 1ac, the number of setting
and the setting position.
[0084]
A state in which the yoke 1 having such a configuration is attached to the frame 4 is shown in
FIG.
[0085]
12-04-2019
25
In the speaker device 400 according to the fourth embodiment, since the plurality of grooves 1ac
are provided in the yoke 1, the speaker device 400 is driven in a state where the closing member
30 is attached to the yoke 1, and the yoke 1 is closed. In the case where the speaker device 400
is driven in a state in which the member 30 is not attached, the following unique operation and
effects are achieved.
[0086]
First, when the speaker device 400 is driven in a state in which the closing member 30 is
attached to the yoke 1, the following effects can be obtained.
[0087]
That is, as shown in FIG. 8, when it is assumed that the voice coil bobbin 5 and the like move in
the direction of arrow Y2 when the speaker device 400 is driven, the space E1 becomes smaller,
and the air present in the space E1 is compressed.
Therefore, a part of the air present in the space E1 travels in the Y3 direction between the outer
peripheral wall of the center pole 1a which is an element of the yoke 1 and the inner peripheral
wall of the voice coil bobbin 5 to make space E2. While being discharged into the inside, each
groove 1ac provided in the yoke 1 travels in the direction of the arrow Y9 and is discharged into
the space E2.
Subsequently, a part of the air discharged into the space E2 follows a path substantially the same
as that of the third embodiment described above, and is discharged to the external space.
In the following, the flow path of the air from the space E1 to the space E2 via the grooves 1ca of
the yoke 1 or the opposite path is also referred to as a “path K4”. That is, this gives rise to four
air flow paths, ie, paths K1, K2, K3 and K4. Conversely, assuming that voice coil bobbin 5 has
moved in the direction of arrow Y1, air existing in the external space flows into the internal space
of speaker device 400 through paths K1, K2, K3 and K4 described above. , Space E1 becomes
large.
[0088]
12-04-2019
26
By repeating such a series of operations / actions, the heat radiation effect of the voice coil 6 is
promoted as in the first to third embodiments, and the thermal durability of the speaker device
400 can be improved. . However, in the fourth embodiment, the speed and the like of air when
passing through the gap near the outer peripheral wall of the voice coil 6 at the time of driving
the speaker device 400 is not equal to the increase of the path K4 compared to the third
embodiment. Become uniform. For this reason, compared with the third embodiment, the thermal
durability of the speaker device 400 is slightly reduced.
[0089]
Next, when the speaker device 400 is driven in a state in which the closing member 30 is
removed from the yoke 1, the following effects can be obtained.
[0090]
That is, assuming that the voice coil bobbin 5 or the like has moved in the direction of the arrow
Y2, the air existing in the internal space of the speaker device 400 includes the grooves 3d of the
plate 3, the air holes 4e of the frame 4, and the yoke 1 The air is discharged to the external space
through the groove 1ac, the vent holes 1ab and the vent holes 1c.
On the other hand, assuming that the voice coil bobbin 5 etc. has moved in the direction of arrow
Y1, the air present in the external space is a speaker through the respective grooves 3d, the
respective vents 4e, the respective slots 1ac, the vents 1ab and the respective vents 1c. It flows
into the internal space of the device 400. For this reason, in the fourth embodiment, since the air
resistance at the time of movement of the vibration system is smaller than that in the third
embodiment by the increase of the path K4 in comparison with the third embodiment, the
vibration system is further enhanced. It becomes easy to vibrate, and the sound quality is
improved compared to the third embodiment. The remaining effects of the fourth embodiment
are similar to those of the first embodiment.
[0091]
Fifth Embodiment Next, the configuration and the like of a speaker device 500 according to a
fifth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a
half sectional view showing the configuration of the speaker device 500 according to the fifth
12-04-2019
27
example.
[0092]
When the fifth embodiment and the fourth embodiment are compared, only the configuration of
the diaphragm 15 is different. That is, in the fifth embodiment, the diaphragm 15 according to
the fourth embodiment is provided with a plurality of air holes 15a, which is different from the
fourth embodiment. As illustrated, each vent hole 15a is formed in the vicinity of the inner
peripheral portion of the diaphragm 15, and is formed at an appropriate interval in the
circumferential direction of the diaphragm 15. In the fifth embodiment, there is no limitation on
the shape and the number of the air holes 15a.
[0093]
A state in which the diaphragm 15 having such a configuration is attached to the outer
peripheral wall of the voice coil bobbin 5 is shown in FIG.
[0094]
In the speaker device 500 according to the fifth embodiment, the diaphragm 15 is provided with
the plurality of air holes 15a. Therefore, when the speaker device 500 is driven in a state where
the closing member 30 is attached to the yoke 1, In the case where the speaker device 500 is
driven in a state in which the closing member 30 is not attached to the above, the following
unique operation and effects are exerted.
[0095]
First, when the speaker device 500 is driven in a state in which the closing member 30 is
attached to the yoke 1, the following effects can be obtained.
[0096]
That is, as shown in FIG. 10, when it is assumed that the voice coil bobbin 5 and the like move in
the direction of arrow Y2 when the speaker device 500 is driven, the space E1 becomes smaller,
and the air present in the space E1 is compressed.
12-04-2019
28
Therefore, a portion of the air present in the space E1 travels in the direction of the arrow Y3
through the gap between the outer peripheral wall of the center pole 1a which is an element of
the yoke 1 and the inner peripheral wall of the voice coil bobbin 5 It is discharged to E2 and
advances in each groove 1ac provided in the yoke 1 in the direction of the arrow Y9 to be
discharged into the space E2, and the lower surface of the diaphragm 15 through each vent hole
15a provided in the diaphragm 15 And the second damper 11b, etc., into the space E4.
Subsequently, a part of the air discharged into the space E4 is discharged to the external space
through the vent holes 4e of the frame 4, and a part of the air discharged into the space E2 is the
third mentioned above. It follows the route substantially the same as the embodiment and is
discharged to the external space.
In the following, the flow path of air from the space E1 to the external space via the space E4 or
the opposite path is also referred to as a “path K5”. That is, this gives rise to five air flow
paths, that is, paths K1, K2, K3, K4 and K5. Conversely, assuming that the voice coil bobbin 5 has
moved in the direction of the arrow Y1, air existing in the external space flows into the internal
space of the speaker device 500 through the paths K1, K2, K3, K4 and K5 described above. Space
E1 becomes large.
[0097]
By repeating such a series of operations / actions, the heat radiation effect of the voice coil 6 is
promoted as in the first to fourth embodiments, and the thermal durability of the speaker device
500 can be improved. . However, in the fifth embodiment, the speed and the like of air when
passing through the gap near the outer peripheral wall of the voice coil 6 at the time of driving
the speaker device 500 is not equal to the increase of the path K5 in comparison with the fourth
embodiment. Become uniform. For this reason, the thermal durability of the speaker device 500
is slightly reduced compared to the fourth embodiment.
[0098]
Next, when the speaker device 500 is driven in a state in which the closing member 30 is
removed from the yoke 1, the following effects can be obtained.
[0099]
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29
That is, assuming that the voice coil bobbin 5 or the like has moved in the direction of arrow Y 2,
the air existing in the internal space of the speaker device 500 passes through the air holes 15 a
of the diaphragm 15, the grooves 1 ca of the yoke 1, and the yoke 1. The air is discharged to the
external space through the pores 1c and 1ab, the grooves 3d of the plate 3, and the air holes 4e
of the frame 4.
On the other hand, assuming that the voice coil bobbin 5 or the like has moved in the direction of
arrow Y1, the air existing in the external space is the air holes 15a, the grooves 1ca, the air holes
1c, the air holes 1ab, the grooves 3d and the air. The air flows into the internal space of the
speaker device 500 through the pores 4e and the like. Therefore, in the fifth embodiment, since
the air resistance at the time of movement of the vibration system is smaller than that in the
fourth embodiment by the increase of the path K5 in comparison with the fourth embodiment,
the vibration system is further enhanced. It becomes easy to vibrate and the sound quality is
improved as compared with the fourth embodiment. The remaining effects of the fifth
embodiment are similar to those of the first embodiment.
[0100]
Sixth Embodiment Next, the configuration and the like of a speaker device 600 according to a
sixth embodiment of the present invention will be described with reference to FIG. FIG. 11 is a
half sectional view showing the configuration of the speaker device 600 according to the sixth
embodiment.
[0101]
When the sixth embodiment and the fifth embodiment are compared, only the configuration of
the voice coil bobbin 5 is different. That is, in the sixth embodiment, a plurality of vent holes 5a
are provided in the vicinity of the lower end portion of the side wall of the voice coil bobbin 5
according to the fifth embodiment, which is different from the fifth embodiment. As illustrated,
the air holes 5 a are formed at appropriate intervals in the circumferential direction of the voice
coil bobbin 5. In the sixth embodiment, there is no limitation on the shape and the number of the
air holes 15a.
[0102]
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30
A state in which the voice coil bobbin 5 having such a configuration is attached to the speaker
device 600 is shown in FIG.
[0103]
In the speaker device 600 according to the sixth embodiment, the plurality of air holes 5a are
provided in the voice coil bobbin 5. Therefore, when the speaker device 600 is driven in a state
in which the closing member 30 is attached to the yoke 1, In the case where the speaker device
600 is driven in a state in which the closing member 30 is not attached to the above, the
following unique operation and effects can be achieved.
[0104]
First, when the speaker device 600 is driven in a state in which the closing member 30 is
attached to the yoke 1, the following effects can be obtained.
[0105]
That is, as shown in FIG. 11, assuming that the voice coil bobbin 5 and the like move in the
direction of arrow Y2 when driving the speaker device 600, the space E1 becomes smaller, and
the air present in the space E1 is compressed.
Therefore, a portion of the air present in the space E1 travels in the direction of the arrow Y3
through the gap between the outer peripheral wall of the center pole 1a which is an element of
the yoke 1 and the inner peripheral wall of the voice coil bobbin 5 It is discharged to E2,
advances in each groove 1ac provided in the yoke 1 in the direction of arrow Y9 and discharged
to space E2, and also passes through each vent hole 5a of voice coil bobbin 5 and discharged to
space E3. Also, the air is discharged to the space E4 between the lower surface of the diaphragm
15 and the second damper 11b and the like through the air holes 15a provided in the diaphragm
15.
Subsequently, a part of the air discharged into the spaces E3 and E4 is discharged to the outside
space through the vents 4e of the frame 4, and a part of the air discharged into the space E2 is as
described above. A route substantially the same as that of the third embodiment is followed and
discharged to the external space.
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31
In the following, the flow path of air from the space E1 to the external space via the space E3 or
the opposite path is also referred to as a “path K6”. That is, this gives rise to six air flow paths,
ie, paths K1, K2, K3, K4, K5 and K6. Conversely, assuming that voice coil bobbin 5 has moved in
the direction of arrow Y1, space E1 flows into the internal space of speaker device 600 through
paths K1, K2, K3, K4, K5, and K6 described above. growing.
[0106]
By repeatedly performing such a series of operations / actions, the heat radiation effect of the
voice coil 6 is promoted as in the first to fifth embodiments, and the thermal durability of the
speaker device 600 can be improved. . However, in the sixth embodiment, the speed and the like
of air when passing through the gap near the outer peripheral wall of the voice coil 6 at the time
of driving the speaker device 600 is not equal to the increase of the path K6 in comparison with
the fifth embodiment. Become uniform. For this reason, the thermal durability of the speaker
device 600 is slightly reduced as compared with the fifth embodiment.
[0107]
Next, when the speaker device 600 is driven in a state in which the closing member 30 is
removed from the yoke 1, the following effects can be obtained.
[0108]
That is, assuming that the voice coil bobbin 5 etc. has moved in the direction of arrow Y 2, the air
existing in the internal space of the speaker device 600 is the air holes 5 a of the voice coil
bobbin 5, the air holes 15 a of the diaphragm 15, the yoke 1 The air is discharged to the external
space through the respective grooves 1ca of the first embodiment, the vent holes 1c and 1ab of
the yoke 1, the respective grooves 3d of the plate 3 and the vent holes 4e of the frame 4.
On the other hand, assuming that the voice coil bobbin 5 or the like has moved in the direction of
the arrow Y1, the air existing in the external space is the air holes 5a, the air holes 15a, the
grooves 1ca, the air holes 1c, the air holes 1ab, It flows into the internal space of the speaker
device 600 through the groove 3 d and the vent holes 4 e and the like. For this reason, in the
sixth embodiment, since the air resistance at the time of movement of the vibration system is
smaller than that in the fifth embodiment by the increase of the path K6 in comparison with the
fifth embodiment, the vibration system is further enhanced. It becomes easy to vibrate and the
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sound quality is improved as compared with the fifth embodiment. The remaining effects of the
sixth embodiment are similar to those of the first embodiment.
[0109]
MODIFIED EXAMPLE In each said Example, although the closure member 30 was formed in the
shape as shown in FIG. 2, this shape is an example to the last. In the present invention, various
modifications are possible as long as a part of the closing member 30 can close the vent hole 1
ab of the yoke 1 when the closing member 30 is attached to the yoke 1. Further, as another
modification of the closing member 30, for example, as shown in FIG. 2, the diameter D2 of the
flange portion 30b of the closing member 30 is increased as shown in FIG. In the above third to
sixth embodiments, when the closing member 30 is attached to the center pole 1a of the yoke 1,
the flange portion 30b may close the vent holes 1c provided in the yoke 1 as well. .
[0110]
BRIEF DESCRIPTION OF THE DRAWINGS The single-sided sectional view which shows the
structure of the speaker apparatus based on 1st Example of this invention. The top view and
sectional drawing which show the structure of the closure member which is a component of a
speaker apparatus. FIG. 7 is a one-side cross-sectional view showing the configuration of a
speaker device according to a second embodiment of the present invention. The top view and
sectional drawing which show the structure of the plate which concerns on 2nd Example. FIG. 10
is a one-sided sectional view showing the configuration of the speaker device according to a third
embodiment of the present invention. The top view which shows the structure of the yoke which
concerns on 3rd Example. Sectional drawing which shows the structure of the yoke which
concerns on 3rd Example. The one side sectional view showing the composition of the speaker
apparatus concerning a 4th example of the present invention. The top view and sectional
drawing which show the structure of the yoke which concerns on 4th Example. The single-sided
sectional view showing the composition of the speaker apparatus concerning a 5th example of
the present invention. The single-sided sectional view showing the composition of the speaker
apparatus concerning a 6th example of the present invention.
Explanation of sign
[0111]
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DESCRIPTION OF SYMBOLS 1 yoke 1a center pole 1ab, 1c vent 1ac slot 3 plate 3d slot 4 frame
4e vent 5 voice coil bobbin 5a vent 6 voice coil 15 diaphragm 15a vent 30 blocking member
100, 200, 300, 400, 500, 600 Speaker device
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