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JP2008103884

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2008103884
An object of the present invention is to cool a magnetic circuit with a simple configuration,
reduce the suppression of vibration of a damper with a simple configuration, reproduce highquality sound, and the like. In a speaker device 100 adopting a speaker driving device 400 for
driving a speaker diaphragm 8, the speaker driving device 400 has a magnetic circuit 4 in which
a magnetic gap 4g is formed, and an inner peripheral portion, a voice coil 7. And a frame 51 for
supporting the outer peripheral portion of the damper 10 and housing the magnetic circuit 4
therein. Is provided with a vent 516 facing the side portion of the magnetic circuit 4, and an air
flow passage 540 reaching the side portion of the magnetic circuit 4 via the vent 516 is formed
by the vibration of the damper 10. [Selected figure] Figure 4
Speaker drive device and speaker device
[0001]
The present invention relates to a speaker drive device and a speaker device.
[0002]
In a general speaker device, a voice coil wound around a voice coil bobbin connected to a
diaphragm is disposed so as to be able to vibrate in a magnetic gap of a magnetic circuit, and a
diaphragm connected to the voice coil passes through an edge portion. The speaker frame is
vibratably supported by the speaker frame, and the voice coil bobbin is supported by the damper
by the speaker frame.
[0003]
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For example, in a large speaker such as a subwoofer, the temperature inside the vehicle may be
relatively high in summer, and the magnetic circuit may be 80 ° C. or higher.
When the magnetic circuit reaches a high temperature of, for example, 80 ° C. or more and then
drops to room temperature, the magnetic force of the magnet decreases more than before
reaching the high temperature.
That is, the magnetic force of the magnet decreases, the driving force of the speaker diaphragm
decreases, and the sound quality of the reproduced sound may decrease.
[0004]
In addition, while the speaker diaphragm is driven, the temperature in the magnetic circuit
becomes high. Generally, heat is emitted to the outside by forming a vent in the frame. However,
in the case of a large-sized speaker, the heat dissipation effect may be insufficient only by the
above-mentioned measures. If the heat radiation effect is insufficient, the Joule heat generated by
the voice coil, in particular, causes the temperature to rise and the resistance to decrease. As a
result, the sound quality of the reproduced sound may be degraded such that the reproduced
sound is different when the speaker diaphragm starts to be driven and when it is continuously
driven for a long time.
[0005]
By the way, in a general speaker device, a sealed space is formed by the damper, the speaker
frame, and the magnetic circuit on the back side of the damper (the side opposite to the acoustic
radiation direction of the speaker). As a result, a force that suppresses the vibration of the
damper is generated, the vibration of the voice coil bobbin and the diaphragm is suppressed, and
the sound quality of the reproduced sound may be degraded.
[0006]
For example, Patent Document 1 discloses a speaker in which a vent hole is provided between a
connecting portion connected to a magnetic circuit in a spy frame and a damper support portion
of a speaker frame to improve the frequency characteristic of reproduced sound. ing.
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[0007]
JP-A-8-79866
[0008]
However, in the above-described speaker, since the vent hole is simply formed in the speaker
frame between the connection portion to the magnetic circuit and the damper support portion,
the suppression force against the vibration of the damper can be reduced. It is not possible to
cool the circuit.
[0009]
The present invention takes an example of the problem to address such a problem.
That is, it is an object of the present invention to cool the magnetic circuit with a simple
configuration, to reduce the suppressing force against the vibration of the damper with a simple
configuration, to reproduce high-quality sound, and the like.
[0010]
In order to achieve such an object, the present invention at least comprises the configurations
according to the following independent claims.
[0011]
The invention according to claim 1 is a speaker drive device for driving a speaker diaphragm,
wherein a magnetic circuit in which a magnetic gap is formed, and a voice coil bobbin in which
an inner peripheral portion is wound around a voice coil And a frame supporting the outer
peripheral portion of the damper and accommodating the magnetic circuit, the frame including a
vent hole facing the side surface of the magnetic circuit. The air flow passage may be formed to
reach a side surface portion of the magnetic circuit through the air vent by vibration of the
damper.
[0012]
The invention according to claim 5 is a speaker device provided with a speaker drive device for
driving a speaker diaphragm, wherein the speaker drive device has a magnetic circuit in which a
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magnetic gap is formed, and an inner peripheral portion is a voice coil. A damper for vibratably
supporting a voice coil bobbin wound around the magnetic circuit in the magnetic gap of the
magnetic circuit, and a frame for supporting the outer peripheral portion of the damper and
accommodating the magnetic circuit, the frame being A ventilating hole is provided facing the
side face of the circuit, and an air flow passage leading to the side face of the magnetic circuit
through the ventilating hole is formed by the vibration of the damper.
[0013]
A speaker driving device according to an embodiment of the present invention is a device for
driving at least a speaker diaphragm, and a magnetic circuit in which a magnetic gap is formed,
and a voice coil bobbin in which an inner peripheral portion is wound around a voice coil. The
damper has a damper that is vibratably supported in the magnetic gap of the magnetic circuit,
and a frame that supports the outer peripheral portion of the damper and houses the magnetic
circuit, and the frame includes a vent facing the side portion of the magnetic circuit The air flow
passage is formed through the vent holes to the side portions of the magnetic circuit.
[0014]
In the speaker driving device of the above configuration, the frame is provided with the vent
facing the side of the magnetic circuit, and the vibration of the damper forms an air flow passage
leading to the side of the magnetic circuit through the vent. Thus, the magnetic circuit can be
cooled with a simple configuration.
Further, as described above, since the vent having the above configuration is formed in the
frame, it is possible to reduce the suppression force against the vibration of the damper with a
simple configuration.
Moreover, the suppression force with respect to the vibration of a damper can be reduced, and
the temperature rise by heat_generation | fever of a magnetic circuit can be reduced by cooling.
[0015]
Furthermore, while the speaker diaphragm is being driven, the outside air and the air in the
speaker drive device are repeatedly exchanged to promote the circulation of the air, so that the
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temperature of the air convectioned in the speaker drive device is increased. The fact that the
temperature of the magnetic circuit having a yoke, a magnet or the like and the voice coil can be
prevented from rising by placing the air kept at normal temperature against the magnetic circuit,
particularly the side of the yoke. Since the flow passage is formed, cold air can be taken from the
outside as the damper vibrates.
As a result, by applying external air to the magnetic circuit, the temperature in the speaker drive
device can be prevented from rising, and the like.
[0016]
Further, a speaker device adopting the above-described speaker driving device includes a speaker
diaphragm which is driven by the speaker driving device and supported so as to be vibrated by a
frame.
In the speaker device of the above configuration, the damper vibrates when the speaker
diaphragm is driven, and the vibration of the damper forms an air flow passage extending to the
side surface portion of the magnetic circuit through the air vent, so a simple configuration is
provided. Can cool the magnetic circuit.
Further, as described above, since the vent having the above configuration is formed in the
frame, it is possible to reduce the suppression force against the vibration of the damper with a
simple configuration.
Moreover, the suppression force with respect to the vibration of a damper is reduced, the
temperature rise by heat_generation | fever of a magnetic circuit can be reduced by cooling, and
a high-quality sound can be reproduced | regenerated.
[0017]
Hereinafter, a speaker device adopting a speaker driving device according to an embodiment of
the present invention will be described with reference to the drawings.
[0018]
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First Embodiment FIG. 1 is a cross-sectional view of a speaker device 100 employing a speaker
driving device 400 according to a first embodiment of the present invention.
FIG. 2 is a perspective view from the sound radiation side of the speaker device 100 shown in
FIG.
FIG. 3 is a perspective view from the back surface side (the opposite side of the acoustic radiation
side) of the speaker device 100 shown in FIG. FIG. 4 is an enlarged view of the vent holes formed
in the frame shown in FIGS. 1 to 3 and the vicinity of the vent holes for explaining an air vent.
[0019]
For example, as shown in FIGS. 1 to 4, the speaker device 100 according to the present
embodiment includes a magnetic circuit 4 including a yoke 1, a magnet 2, and a plate 3, a first
frame (frame for speaker driving device) 51, and A speaker frame (also referred to as a frame) 5
including two frames (a frame for supporting a diaphragm) 52, a voice coil bobbin 6, a voice coil
7, a diaphragm 8, an edge portion 9, a damper 10, and a center cap 11 And an upper ring 12 and
a dustproof net 13.
[0020]
The speaker drive device 400 having the magnetic circuit 4, the damper 10, and the first frame
51 corresponds to an embodiment of the speaker drive device according to the present invention.
[0021]
The magnetic circuit 4 may employ, for example, an inner magnet type magnetic circuit, an outer
magnet type magnetic circuit, or a composite type magnetic circuit combining them.
In the present embodiment, an internal magnetic type magnetic circuit 4 is employed.
First, each component of the magnetic circuit 4 will be described in detail with reference to the
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drawings.
[0022]
For example, as shown in FIGS. 1 to 4, the yoke 1 according to the present embodiment has a flat
portion 1A in which the magnet 2 is disposed at the top and a hole 1E is formed in the central
portion, and a peripheral portion of the flat portion 1A. A bent portion 1B having a shape
extending toward the back side (opposite side to the acoustic radiation side) and bent radially
outward, and disposed on the magnet 2 from the bent portion 1B toward the acoustic radiation
side It has a side portion 1C of a shape extending to the vicinity of the side surface portion of the
plate 3 and a bent end portion 1D of a shape bent radially outward from the top of the side
portion 1C. The first frame 51 is joined to the bent end 1D. In the yoke 1 according to the
present embodiment, the flat portion 1A, the bending portion 1B, the side portion 1C, and the
bending end portion 1D are integrally formed. As a forming material of the yoke 1, for example, a
magnetic material such as an inorganic material, a metal, or iron can be adopted.
[0023]
The magnet 2 is formed, for example, in a disk shape, as shown in FIGS. 1 to 4, and is placed on
the flat portion 1 </ b> A of the yoke 1. As the magnet 2, permanent magnets, such as a
neodymium type, a samarium cobalt type, an alnico type, a ferrite type magnet, etc. are
employable, for example.
[0024]
The plate 3 is formed in, for example, a disk shape, as shown in FIGS. 1 to 4, and is mounted on
the magnet 2. The plate 3 is formed to have substantially the same diameter as the magnet 2. As
a formation material of plate 3, metal, such as iron, can be adopted, for example.
[0025]
Further, in the magnetic circuit 4 according to the present embodiment, the yoke 1, the magnet
2, and the plate 3 are formed concentrically with respect to the central axis, and in detail, a
position where they overlap coaxially and along the central axis direction. Placed close to.
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[0026]
Further, as shown in FIGS. 1 to 4, the magnetic circuit 4 has a magnetic gap 4 g, and the
magnetic flux is concentrated in the magnetic gap 4 g.
More specifically, the magnetic gap 4g is formed between the upper end of the side portion 1C of
the yoke 1 and the outer periphery of the plate 3, and is formed, for example, with a substantially
uniform gap over the entire periphery. .
[0027]
[Speaker Frame (Frame) 5] As described above, the frame 5 according to this embodiment
includes the first frame 51 and the second frame 52. The first frame 51 corresponds to an
embodiment of a frame of the speaker driving device according to the present invention. The first
frame 51 and the second frame 52 are connected by a connecting arm 521 at a prescribed
interval. For example, as shown in FIGS. 1 to 4, a plurality of connection arm portions 521 are
formed at equal intervals along the circumferential direction. In the present embodiment, five
connecting arms 521 are formed. In addition, the first frame 51 and the second frame 52 have a
structure separated by a defined gap as described above, and an air passage is formed in the gap,
and the back surface side of the diaphragm 8 It has a function to reduce back pressure by
emitting an acoustic wave to the opposite side to the acoustic radiation side).
[0028]
As a forming material of the frame 5, various materials, such as resin materials, such as a plastic,
metals, such as iron and aluminum, other composite materials, etc. are employable, for example.
Further, in the frame 5 according to the present embodiment, the first frame 51, the second
frame 52, and the connecting arm portion 521 are integrally formed. Moreover, it is not
restricted to the said form, For example, the 1st flame | frame 51, the 2nd flame | frame 52, and
the connection arm part 521 may be formed by another member, respectively, and may be
adhesively fixed by the adhesive agent etc. .
[0029]
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Hereinafter, each component of the frame 5 will be described in detail.
[0030]
First Frame 51 As shown in FIGS. 1 to 4, the first frame 51 internally includes the magnetic
circuit 4 and supports the outer peripheral portion of the damper 10.
Specifically, as shown in FIGS. 1 to 4, the first frame 51 has a damper support portion 511, an
outer inclined surface portion 512, a bottom portion 513, an inner inclined surface portion 514,
and a connecting portion 515.
[0031]
The connection portion 515 corresponds to an embodiment of the magnetic circuit connection
portion according to the present invention. The damper support portion 511, the outer inclined
surface portion 512, and the bottom portion 513 correspond to an embodiment of the damper
support portion according to the present invention. The inner inclined surface portion 514
corresponds to an embodiment of the side surface portion of the frame according to the present
invention.
[0032]
The inner inclined surface portion 514 is formed with a vent 516 facing the side surface portion
of the magnetic circuit 4. In the first frame 51 according to the present embodiment, a
reinforcing rib 517 is formed between the outer inclined surface portion 512, the bottom portion
513, and the inner inclined surface portion 514. In detail, on the first frame 51, a plurality of
reinforcing ribs 517 are formed at prescribed intervals along the circumferential direction. The
damper support portion 511, the outer inclined surface portion 512, the bottom portion 513, the
inner inclined surface portion 514, and the connecting portion 515 are integrally formed.
[0033]
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The damper support portion 511 is formed at the upper end portion of the outer periphery of the
first frame 51, and supports the outer peripheral portion 10A of the damper 10. The inner
circumferential portion 10 B of the damper 10 is connected to the voice coil bobbin 6.
[0034]
The outer inclined surface portion 512 is provided on the inner peripheral side with respect to
the damper support portion 511, and as shown in FIGS. 1 to 4, for example, an inclined surface is
formed to open toward the acoustic radiation side. A damper support portion 511 is formed on
the outer peripheral side of the outer inclined surface portion 512, and a bottom portion 513 is
formed on the inner peripheral side.
[0035]
The bottom portion 513 is provided between the outer inclined surface portion 512 and the
inner inclined surface portion 514 and disposed on substantially the same plane as the bottom
portion of the yoke 1. For example, as shown in FIGS. 1 to 4, the dustproof net 13 is attached to
the bottom 513 of the first frame 51 according to the present embodiment by an adhesive or the
like. It is preferable that the dustproof net 13 be appropriately provided according to the use
environment and the like.
[0036]
That is, as shown in FIGS. 1 to 4, it extends from the bottom 513 formed at the lower end of the
inner inclined surface 514 to the end of the outer inclined surface 512 that is bent toward the
acoustic radiation side to the vicinity of the damper 10 A damper support 511 is formed.
[0037]
For example, as shown in FIGS. 1 to 4, the inner inclined surface portion 514 is disposed to face
the side surface of the magnetic circuit 4 at intervals from the upper end to the lower end
(bottom) of the magnetic circuit 4.
Specifically, the inner inclined surface portion 514 is disposed to face the side surface of the
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magnetic circuit 4 from the coupling portion 515 with a gap. Further, as described above, as
shown in FIGS. 1 to 4, the inner inclined surface portion 514 is formed with a vent 516 facing
the side surface portion of the magnetic circuit 4. In the present embodiment, as shown in FIGS.
1 to 4, a plurality of ventilation holes 516 are formed in the inner inclined surface portion 514 at
equal intervals in the circumferential direction.
[0038]
For example, as shown in FIGS. 1 to 4, the connecting portion 515 is formed at the upper end
portion of the inner inclined surface portion 514, and in detail, is bent to the inner peripheral
side from the upper end portion. In detail, the upper end of the bending end 1D of the yoke 1 is
connected by an adhesive or the like.
[0039]
For example, as shown in FIGS. 1 to 4, the vent 516 is formed in the inner inclined surface
portion 514 so as to face the side surface portion of the magnetic circuit 4.
Further, as shown in FIG. 4, when the speaker is driven, the damper 10 vibrates to form an air
flow passage 540 reaching the side surface portion of the magnetic circuit 4 via the air vent 516.
[0040]
For example, as shown in FIGS. 1 to 4, the reinforcing rib 517 is disposed between the outer
inclined surface portion 512 and the inner inclined surface portion 514 and formed to contact
the outer inclined surface portion 512, the lower portion 513, and the inner inclined surface
portion 514. And the function of reinforcing the strength of the first frame 51. Specifically, as
shown in FIGS. 1 to 4, a plurality of reinforcing ribs 517 are formed in the first frame 51 at
prescribed intervals in the circumferential direction.
[0041]
As described above, in the first frame 51 configured as described above, the vent hole 516 is
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formed in the inner inclined surface portion 514 so as to face the side surface portion (the side
portion 1C of the yoke 1) of the magnetic circuit 4. Since the air flow passage 540 reaching the
side surface portion of the magnetic circuit 4 through the vent hole 516 is formed by the
vibration of the damper 10, the magnetic circuit can be cooled at the time of driving the speaker
with a simple configuration. Moreover, since the vent hole 516 which connects the lower side of
damper 10 and the exterior is formed in the flame | frame below the damper 10, the suppression
force with respect to the vibration of the damper 10 can be reduced by easy structure.
[0042]
Second Frame 52 As shown in FIGS. 1 to 4, the second frame 52 is formed in a substantially
cylindrical shape. In detail, the second frame 52 is formed on the outer side surface, and is
formed on the flange-like attachment portion 52A protruding in the radial direction, and is
formed on the upper portion, and the diaphragm 8 is formed via the edge portion 9 And a
support portion 52B that vibratably supports the For example, as shown in FIG. 3, the mounting
portion 52A is formed with a mounting hole 52C for fixing it to an external mounting member.
Further, in the second frame 52, a plurality of connecting arm portions 521 are formed on the
inner peripheral portion. As described above, the first frame 51 and the second frame 52 are
connected and fixed by the connecting arm portion 521.
[0043]
In the first frame 51 and the second frame 52 of the above configuration, as described above,
they are disposed at prescribed intervals via the connecting arm 521, and the back surface side
(the opposite side to the acoustic radiation side) of the diaphragm 8 is Since the structure is in
communication with the outside, the back pressure of the diaphragm 8 can be reduced, and the
suppression force on the diaphragm 8 can be reduced.
[0044]
For example, as shown in FIGS. 1 to 4, the voice coil bobbin 6 has a voice coil 7 wound around
the outer periphery and near the lower portion thereof, and the voice coil 7 is disposed so as to
be located in the magnetic gap 4 g There is.
Further, an inner peripheral portion of the diaphragm 8 and an inner peripheral portion 10B of
the damper 10 are bonded and fixed to the outer peripheral portion of the voice coil bobbin 6
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and in the vicinity of the upper end thereof. A center cap 11 is provided on the top of the voice
coil bobbin 6. Further, an air vent 61 communicating the inside and the outside is formed in the
side portion of the voice coil bobbin 6 and in the vicinity of the central portion thereof. A
plurality of vent holes 61 may be formed. The vent hole 61 has a function of controlling the
pressure in the center cap 11 and the voice coil bobbin 6 and moving the voice coil bobbin 6
smoothly in the vibration direction (central axis direction).
[0045]
The voice coil 7 is wound around the outer periphery of the voice coil bobbin 6 and in the
vicinity of the lower part thereof, and is electrically connected to a terminal (not shown) provided
on the frame 5 via a conductive wire.
[0046]
For example, as shown in FIGS. 1 to 4, the diaphragm 8 according to the present embodiment is
formed in a substantially cone shape, the inner peripheral portion thereof is fixed to the voice
coil bobbin 6 by an adhesive or the like, and the outer peripheral portion 8A is an edge portion 9.
The second frame 52 is vibratably supported by the support portion 52B of the second frame 52.
The diaphragm 8 is not limited to the above-described shape, and may have various shapes such
as a dome shape. The material for forming the diaphragm 8 is, for example, a fabric made of
paper, chemical fiber, paper, cotton, silk or the like impregnated with resin, a metal material such
as aluminum or titanium, a plastic material, a ceramic material, etc. Various materials such as
those obtained by molding phenolic resin, plastic reinforced fiber (FRP) and the like can be
adopted.
[0047]
The edge portion 9 is formed in a ring shape, the inner peripheral portion of the edge portion 9
is connected to the outer peripheral portion of the diaphragm 8, and the outer peripheral portion
is fixed near the upper end of the second frame 52 by an adhesive or the like. ing. Further, the
edge portion 9 is formed with a roll-like portion between the inner peripheral portion and the
outer peripheral portion. The edge portion 9 is not limited to the above-described shape, and
may have various shapes such as a cross-sectional convex shape and a cross-sectional concave
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shape.
[0048]
The outer peripheral portion 10A of the damper 10 is adhesively supported by the damper
support portion 511 of the first frame 51, and the inner peripheral portion thereof is fixed to the
voice coil bobbin 6. When the speaker is driven, it vibrates together with the damper 10 and the
voice coil bobbin 6. The damper 10 according to the present embodiment is preferably, for
example, non-air-permeable in that the air in the speaker drive device can be efficiently applied
to the magnetic circuit, particularly to the side surface of the yoke.
[0049]
The center cap 11 is provided at the upper end portion of the voice coil bobbin 6 and prevents
foreign matter such as dust from entering the voice coil bobbin 6.
[0050]
The upper ring 12 is provided on the upper end of the second frame 52 and has a function of
protecting the edge 9 and the diaphragm 8.
[0051]
As described above, the dustproof net 13 is provided on the bottom side of the magnetic circuit
4, more specifically, on the bottom 513 of the first frame 51, and foreign matter such as dust in
the magnetic circuit 4 or the first frame 51. It has a function to prevent entry.
[0052]
In the speaker device 100 configured as described above, for example, when an audio signal is
input from a terminal portion (not shown) provided in the frame 5, the audio signal is applied to
the voice coil 7 via the conductive line.
In the voice coil 7, a driving force is generated by an electromagnetic action by the input audio
signal, and the driving force is transmitted to the voice coil bobbin 6 to vibrate the diaphragm 8
and the damper 10 connected to the voice coil bobbin 6.
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Then, as the diaphragm 8 vibrates, sound waves are emitted in the acoustic radiation direction
(forward direction).
In addition, when the speaker is driven, the damper 10 vibrates with the vibration of the voice
coil bobbin 6, and the air flow passage 540 reaching the side surface portion of the magnetic
circuit 4 through the air vent 516 formed in the first frame 51 Once formed, the magnetic circuit
can be cooled. Further, since the vent holes 516 of the above configuration are formed in the
frame 5, it is possible to reduce the suppressing force against the vibration of the damper 10
with a simple configuration. Further, by providing the vent holes 516, resonance (high frequency
region) occurring between the back surface side of the damper 10 and the first frame 51 can be
reduced. That is, in the frequency characteristics of the reproduced sound, it is possible to
improve the sound quality in the high sound band particularly compared to the conventional
case. Moreover, in the speaker apparatus 100 of the said structure, since the magnetic circuit 4 is
cooled at the time of speaker drive, the magnetic force fall of the magnet 2 can be prevented.
Further, since the speaker device 100 can prevent the decrease in the magnetic force, reduce the
suppression force on the vibration of the damper 10, prevent the resonance, and the like, highquality sound can be reproduced.
[0053]
Second Embodiment FIG. 5 is a cross-sectional view of a speaker device 100A according to a
second embodiment of the present invention. Descriptions of configurations, operations, effects,
and the like similar to those of the first embodiment will be omitted.
[0054]
In the speaker device 100 according to the present embodiment, as shown in FIG. 5, the first
frame 51 and the second frame 52 of the frame 5 of the speaker device 100 according to the
first embodiment are integrally formed. It has a frame 5B of different structure. A vent may be
formed on the side surface between the edge support 52 </ b> B of the frame 5 </ b> B and the
damper support 511. The other configuration is substantially the same as that of the first
embodiment.
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[0055]
In the speaker device 100B configured as described above, the frame 5B is relatively small
compared to the frame 5 of the first embodiment, so the entire speaker device 100B can be
formed relatively small. Further, the installation space of the speaker device 100B can be made
relatively small. Furthermore, by forming the first frame 51 and the second frame 52 which are
different in size from each other, the entire speaker device is lighter in weight than in the case
where one frame as disclosed in Patent Document 1 is formed. There are also things that can be
[0056]
The present invention is not limited to the embodiment described above. For example, the
embodiments according to the present invention described above may be combined. Moreover,
although the magnetic circuit of this embodiment employ | adopted the internal magnet type
magnetic circuit, it is not restricted to this form.
[0057]
Further, as the diaphragm 8 described above, diaphragms of various shapes such as a curved
cone shape, a flat cone, a parabolic cone, an elliptical cone, a circular cone, etc. may be adopted.
Moreover, although the damper 10 which concerns on embodiment mentioned above was
equipped with the corrugation of a cross-sectional waveform, it is not restricted to this form. The
damper 10 may be formed in various shapes.
[0058]
As described above, in the speaker device 100 employing the speaker driving device 400 for
driving the speaker diaphragm 8, the speaker driving device 400 has the magnetic circuit 4 in
which the magnetic gap 4g is formed, and the inner peripheral portion has a voice. The damper
10 has the voice coil bobbin 6 wound around the coil 7 vibratably supported by the magnetic
gap 4g of the magnetic circuit 4, and a frame 51 that supports the outer periphery of the damper
10 and accommodates the magnetic circuit 4. The frame 51 is provided with a vent 516 facing
the side of the magnetic circuit 4, and an air flow passage 540 is formed to the side of the
magnetic circuit 4 through the vent 516 by the vibration of the damper 10. The magnetic circuit
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4 can be cooled with a simple configuration. Moreover, the suppression force with respect to the
vibration of the damper 10 can be reduced by easy structure. In addition, high-quality sound can
be reproduced.
[0059]
FIG. 1 is a cross-sectional view of a speaker device adopting a speaker drive device according to a
first embodiment of the present invention. It is a perspective view from the sound radiation side
of the speaker apparatus shown in FIG. It is a perspective view from the back side (opposite side
of the sound radiation side) of the speaker apparatus shown in FIG. It is an enlarged view of the
vent hole formed in the flame | frame shown to FIGS. 1-3, and the vent hole vicinity for
demonstrating an air vent. It is sectional drawing of the speaker apparatus based on 2nd
Embodiment of this invention.
Explanation of sign
[0060]
Reference Signs List 1 yoke 2 magnet 3 plate 4 magnetic circuit 4 g magnetic gap 5 speaker
frame 6 voice coil bobbin 7 voice coil 8 diaphragm 9 edge portion 10 damper 11 center cap 12
upper ring 13 dustproof net 51 first frame (speaker drive device side frame) 52 second frame
(diaphragm side frame) 511 damper support 512 outer inclined surface 513 bottom 514 inner
inclined surface 515 connection 516 vent 517 reinforcing rib 521 connection arm 540 air flow
passage 100 speaker device (speaker) 400 Speaker drive device
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