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JP2008085528

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DESCRIPTION JP2008085528
PROBLEM TO BE SOLVED: To provide an electrodynamic speaker and a speaker system which
are small or thin electrodynamic speakers, particularly excellent in bass reproduction ability and
suitable for being attached to a device such as a display. SOLUTION: This is an electrodynamic
loudspeaker of the front magnetic circuit type in which a magnetic circuit is disposed on the
concave side of a cone type diaphragm, and the first frame and the second frame are radiated to
the concave side of the cone type diaphragm. Compared with the case where the sound wave is
directly radiated to the free space, a higher pressure is caused to compress and expand the air to
form a sound conducting portion leading to the free space, and the sound conducting portion is
the first on the concave side of the cone type diaphragm. A sound source space defined
corresponding to the peripheral portion of one frame, and a sound path for guiding a sound wave
radiated from the concave side of the cone-shaped diaphragm to the free space are
accommodated, and a magnetic circuit is accommodated in the sound source space. [Selected
figure] Figure 1
Electrodynamic speaker and speaker system
[0001]
The present invention relates to an electrodynamic speaker and a speaker system, which are
small or thin electrodynamic speakers, in particular, excellent in bass reproduction ability and
suitable for being attached to a device such as a display.
[0002]
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1
In audio equipment such as a display to which a speaker for reproducing sound is attached, and
in game machines such as a game machine and a slot machine, there is a demand for
miniaturizing a space required to attach the speaker.
Loudspeakers, especially small-sized or thin-type electrodynamic speakers, have limited
diaphragm area, can not adopt high-height speakers with large magnetic circuits that require
thickness, and the acoustic volume defined by the cabinet volume is insufficient Since it is
disadvantageous in bass reproduction ability for various reasons such as, various electrodynamic
speakers and a speaker system using the same have been proposed to solve this.
[0003]
For example, in a speaker system for use in a display with a large depth dimension, in the case of
a speaker system and an acoustic tube, the convex surface of a conical diaphragm is projected to
the front on the back of a sound path tube having an opening in one direction. A speaker that
mounts the mounted speaker by inserting the convex surface of the conical diaphragm in the
inward direction of the sound channel, arranging the sound channel axis and the speaker axis at
a right angle, and improving the frequency characteristic of the reproduced sound There is a
system. (Patent Document 1).
[0004]
In a slot machine having a speaker attached, the first speaker is attached to the inner surface of
the door so as to emit sound effects from the front of the door, and the second speaker is on the
side of the reel block. An attachment hole provided inside the acoustic box attached to the inner
surface of one side wall of the casing body, the second speaker being attached to the acoustic
box and for emitting the front sound of the second speaker; An outlet for discharging the back
sound of the second speaker to the outside, the mounting hole directed to the other side wall
opposite to the other, and an outlet opened in the back wall or side wall of the casing main body
There is one that is attached to the inner surface of the side wall so as to be in communication
with the opening (Patent Document 2).
[0005]
Furthermore, in the speaker system that reproduces the bass, the speaker and the speaker are
attached to the same shape sealed box to cause higher air compression and expansion than when
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2
radiating directly into free space, and the sound wave emitted from the speaker is There is a
speaker system provided with a sound conductor which leads to free space (Patent Document 3).
The sound guiding portion has a sound source space defined corresponding to the peripheral
portion of the speaker, and a sound path for deriving sound waves radiated from the speaker into
free space, and the sound path has a width of the middle portion of the sound source space The
speaker system has a planar shape that is narrower than the width of the connection between the
sound path and the sound path and the width of the outlet of the sound path, and is
asymmetrical with respect to the axis of the sound wave derivation direction of the sound path
The f0 is lower by 20% or more compared to f0 when the speaker is attached to a closed box of
the same shape and radiated directly to free space, and a sufficient bass is reproduced even if the
volume of the cabinet is small.
[0006]
Patent No. 3211678 Patent No. 3777058 Patent No. 3655651
[0007]
Even in audio devices such as displays and game machines such as game machines and slot
machines, a speaker system having good low-frequency reproduction characteristics comparable
to the above-mentioned Patent Document 3 is also provided therein for good sound reproduction.
It is preferable to be attached.
However, in these devices, there is a strong demand for miniaturizing the space required to
attach the speaker, in relation to other components disposed in the inner space of the device
housing, as described in Patent Document 3 above. It can be difficult to mount the speaker
system inside it. In particular, in the speaker system described in Patent Document 3, since the
magnetic circuit of the electrodynamic speaker protrudes on the opposite side of the sound
conducting portion, that is, the space inside the device housing, the overall size and thickness can
be reduced. There is a problem that it is difficult to plan.
[0008]
The present invention has been made to solve the above-mentioned problems of the prior art,
and the object thereof is a small or thin electrodynamic speaker, in particular, excellent in bass
reproduction ability and attached to a device such as a display. An electrodynamic speaker
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suitable for the purpose and providing a speaker system.
[0009]
An electrodynamic speaker according to the present invention comprises a cone-shaped
diaphragm, and a voice coil having a coil disposed so as to project on the concave side of the
cone-shaped diaphragm and having a bobbin coupled to the inner peripheral end of the coneshaped diaphragm. An edge supporting the outer peripheral end of the cone-shaped diaphragm,
a damper connected to the bobbin to support the inner peripheral end of the cone-shaped
diaphragm, a first frame fixing the edge and the outer peripheral end of the damper, and a coil
An electrodynamic speaker comprising: a magnetic circuit having a magnetic gap disposed
therein; and a second frame coupled to the first frame to arrange the magnetic circuit on the
concave side of the cone-shaped diaphragm, the first frame and The second frame forms a sound
conduction portion that causes higher compression and expansion of air compared with direct
emission of sound waves radiated to the concave side of the cone-shaped diaphragm to free
space, and leads to free space. The sound guiding portion is a sound source space defined
corresponding to the peripheral portion of the first frame on the concave side of the cone-shaped
diaphragm, and a sound path for extracting sound waves radiated from the concave side of the
cone-shaped diaphragm to free space And the magnetic circuit is accommodated in the sound
source space.
[0010]
Preferably, in the electrodynamic speaker according to the present invention, a cone-shaped
vibration is formed by an opposing wall formed by a second frame in which a sound guiding
portion is opposed and spaced apart from the concave side of a cone-shaped diaphragm by a
predetermined distance. A side wall formed by a second frame which is provided between the
first frame peripheral portion on the concave side of the plate and the opposing wall to define
the sound source space together with the opposing wall, and a sound source space formed in the
side wall An opening and a duct body defining a sound path connected to the sound source space
opening.
[0011]
Preferably, in the electrodynamic speaker according to the present invention, the duct body is
formed of a first flange of the first frame and a second flange of the second frame.
[0012]
Further, in the electrodynamic speaker according to the present invention, the opposing wall
formed by the second frame has a heat dissipating wall that radiates the heat transmitted from
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the magnetic circuit.
[0013]
Further, in the electrodynamic speaker according to the present invention, the second frame is
formed to also serve as the yoke forming the magnetic circuit, and the magnetic gap is formed by
the opposing wall of the second frame and the plate forming the magnetic circuit. Defined
between.
[0014]
Furthermore, preferably, the speaker system of the present invention includes the abovedescribed electrodynamic speaker, a cabinet having a mounting portion for fixing the sound
guiding portion of the electrodynamic speaker, and a connection duct connected to the duct
body.
[0015]
Further, a speaker system according to the present invention includes: a cone-shaped diaphragm;
and a voice coil having a coil disposed so as to protrude on the concave side of the cone-shaped
diaphragm and having a bobbin coupled to the inner peripheral end of the cone-shaped
diaphragm. An edge supporting the outer peripheral end of the cone-shaped diaphragm, a
damper connected to the bobbin to support the inner peripheral end of the cone-shaped
diaphragm, a first frame fixing the edge and the outer peripheral end of the damper, and a coil
An electrodynamic speaker comprising: a magnetic circuit having a magnetic gap disposed; and a
second frame connected to the first frame to arrange the magnetic circuit on the concave side of
the cone-shaped diaphragm, the first frame and / or In combination with the second frame, the
sound wave emitted to the concave side of the cone-shaped diaphragm is compressed and
expanded higher than in the case of direct emission to free space, and is guided to free space.
And a cabinet having an attachment portion for fixing the electrodynamic speaker and the sound
conducting member, wherein the sound conducting member is defined corresponding to the first
frame peripheral portion on the concave side of the cone-shaped diaphragm The sound source
space has a sound source space, and a sound path for guiding the sound wave emitted from the
concave side of the cone-shaped diaphragm to the free space, and the magnetic circuit is
accommodated in the sound source space.
[0016]
Hereinafter, the operation of the present invention will be described.
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[0017]
An electrodynamic speaker according to the present invention comprises a cone-shaped
diaphragm, and a voice coil having a coil disposed so as to project on the concave side of the
cone-shaped diaphragm and having a bobbin coupled to the inner peripheral end of the coneshaped diaphragm. A so-called front magnetic circuit type speaker including a magnetic circuit
having a magnetic gap in which a coil is disposed and a magnetic circuit disposed on the concave
side of a cone-shaped diaphragm, and further to a concave side of the cone-shaped diaphragm A
sound conductor is provided which causes higher compression and expansion of air and directs
the emitted sound waves into free space as compared to the case where the radiated sound
waves are directly radiated into free space.
[0018]
The sound guiding portion is a sound source space defined corresponding to the peripheral
portion of the first frame on the concave side of the cone-shaped diaphragm, and a sound path
for extracting sound waves radiated from the concave side of the cone-shaped diaphragm to free
space And acts in the same manner as the sound conductor of the speaker system of Patent
Document 3 described above.
That is, the sound guiding portion causes higher compression and expansion of air than when the
electrodynamic speaker is attached to the same shape sealed box and radiated directly to free
space, and the sound wave emitted from the speaker is released to free space To derive.
As a result, the lowest resonance frequency f0 defining the bass reproduction limit is lowered,
and the electrodynamic loudspeaker of the present invention can reproduce sufficient bass.
[0019]
The sound source space and the sound path in the present invention are substantially the same
as those described in Patent Document 3.
The sound source space is a space defined corresponding to the frame peripheral portion of the
diaphragm of the speaker, and the sound path is a space which communicates with the sound
source space and guides the sound wave radiated from the speaker to free space The outlet is a
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radiation hole.
[0020]
Preferably, the sound conducting portion is an opposing wall formed by a second frame disposed
opposite to and spaced from the concave side of the cone-shaped diaphragm by a predetermined
distance, and a first frame peripheral edge on the concave side of the cone-shaped diaphragm
And a sound source space opening formed in the side wall and connected to the sound source
space opening, the second wall being provided between the head and the facing wall and forming
a second frame defining the sound source space together with the facing wall; And a duct body
defining a sound path.
The duct body is formed by a first flange of the first frame and a second flange of the second
frame, and defines a radiation hole.
[0021]
In the electrodynamic speaker of the present invention, the sound guiding portion is formed by
the first frame and the second frame constituting the electrodynamic speaker, and the magnetic
circuit is accommodated in the sound source space.
That is, the front magnetic circuit type speaker provided with the magnetic circuit on the concave
side of the cone type diaphragm is connected to the first frame for fixing the edge and the outer
peripheral end of the damper and the first frame to connect the magnetic circuit to the cone type
diaphragm And a second frame disposed on the concave side of the frame, so that the first frame
and the second frame are formed, and the magnetic circuit is used as an acoustic load to form a
sound conductor.
As a result, the magnetic circuit of the electrodynamic speaker projecting to the opposite side of
the sound guiding part is accommodated in the sound source space of the sound guiding part in
the prior art, so it is excellent in bass reproduction capability and small as a whole. A dynamic
and thin speaker is realized.
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[0022]
In particular, since the magnetic circuit of the electrodynamic speaker is accommodated in the
sound source space of the sound conductor, air moving on the concave side of the cone-shaped
diaphragm in the sound conductor is generated by the coil in the sound source space The
temperature rise due to heat can be suppressed.
Since the magnetic gap of the magnetic circuit is in communication with the sound source space,
the heat generated by the coil is dissipated extremely efficiently, and the entire magnetic circuit
whose temperature rises is also cooled.
In addition, when the second frame in which the magnetic circuit is disposed on the concave side
of the cone-shaped diaphragm is made of metal having excellent thermal conductivity, the
opposing wall simultaneously formed by the second frame transmits from the magnetic circuit.
The heat dissipation efficiency is further enhanced if the heat dissipation wall radiates heat.
For example, metals having excellent thermal conductivity include metals such as iron, copper,
and aluminum, and alloys containing these.
Therefore, the input-proof performance of the dynamic speaker can be improved.
[0023]
Further, when the second frame is formed of a metal material with high magnetic permeability
such as iron and used as the yoke that constitutes the magnetic circuit of this dynamic speaker,
the magnetic gap of the magnetic circuit is opposite to that of the second frame. It is defined
between a wall and a plate that constitutes a magnetic circuit. Therefore, the number of parts
constituting the electrodynamic speaker can be reduced, and the overall weight reduction and
cost reduction can be achieved. The magnetic circuit is not only accommodated in the sound
source space of the sound conductor, but is integrally formed with the second frame, so the heat
generated by the coil is dissipated extremely efficiently. Input resistance performance can be
improved.
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[0024]
Since the electrodynamic speaker of the present invention is excellent in bass reproduction
ability and is generally miniaturized and thinned, the speaker is attached in relation to other
parts disposed in the space inside the device housing. It is suitable for installation in equipment
that is strongly required to reduce the space required for Of course, the present invention may be
used as a speaker system including the electrodynamic speaker of the present invention, a
cabinet having a mounting portion for fixing the sound conducting part of the electrodynamic
speaker, and a connecting duct connected to a duct body.
[0025]
In the speaker system of the present invention, the electrodynamic speaker is disposed on the
concave side of the cone-shaped diaphragm by connecting the first frame to which the edge and
the outer peripheral end of the damper are fixed and the first frame. A front magnetic circuit type
speaker provided with a second frame, and coupled with the first frame and / or the second
frame to radiate the sound wave radiated to the concave side of the cone type diaphragm directly
to free space A sound guiding member may be attached which causes higher compression and
expansion of air and leads to free space as compared to the case where it is used.
[0026]
It is possible to realize a small-sized or thin electrodynamic speaker excellent in bass
reproduction ability, and in the case of being attached to a device such as a display, it is possible
to effectively utilize the space inside the device casing in relation to other components.
Moreover, by using this electrodynamic speaker, it is possible to provide a speaker system which
is excellent in heat dissipation characteristics and excellent in bass reproduction ability.
[0027]
The electrodynamic speaker according to the present invention is excellent in bass reproduction
ability and has a purpose of providing a small or thin electrodynamic speaker suitable for being
attached to a device housing such as a display, a cone diaphragm, a coil and a cone. A voice coil
having a bobbin disposed so as to project on the concave side of the diaphragm and connected
with the inner peripheral end of the cone diaphragm, an edge supporting the outer peripheral
end of the cone diaphragm, and the bobbin connected A damper supporting the inner peripheral
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9
end side of the cone-shaped diaphragm, a first frame fixing the edge and the outer peripheral end
of the damper, a magnetic circuit having a magnetic gap in which a coil is disposed, and a first
frame And a second frame in which the magnetic circuit is disposed on the concave side of the
cone-shaped diaphragm, wherein the first frame and the second frame are directed to the
concave side of the cone-shaped diaphragm. Compared with direct radiation of the emitted sound
wave to free space, it generates higher compression and expansion of air to form a sound guiding
part leading to free space, and the sound guiding part is a concave surface of a cone-shaped
diaphragm. A sound source space defined corresponding to the peripheral portion of the first
frame on the side, and a sound path for deriving the sound wave radiated from the concave side
of the cone-shaped diaphragm to the free space; It was realized by containing it.
[0028]
The following describes an electrodynamic speaker and a speaker system according to preferred
embodiments of the present invention, but the present invention is not limited to these
embodiments.
[0029]
FIG. 1 is a view for explaining an electrodynamic speaker 1 according to a preferred embodiment
of the present invention.
FIG. 1A is a side cross-sectional view of the electrodynamic speaker 1, and FIG. 1B is an exploded
perspective view of the components of the electrodynamic speaker 1 arranged in order and
viewed obliquely from the bottom side. FIG.
In addition, as described later, a part of the structure of the electrodynamic speaker 1, an internal
structure, and the like are omitted.
[0030]
The electrodynamic speaker 1 of the present embodiment is free from the sound wave radiated
to the concave side of the cone-shaped diaphragm, the magnetic circuit 10 located on the
concave side of the cone-shaped diaphragm 2 with a aperture of 16 cm, the cone-shaped
diaphragm. A front magnetic circuit type speaker comprising a sound conducting portion 9
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10
leading to space. The total height H of the electrodynamic speaker 1 is about 45 mm which is
extremely low as a 16 cm aperture electrodynamic speaker, and the electrodynamic speaker 1 is
a thin front magnetic circuit type speaker suitable for bass reproduction.
[0031]
The edge 4 is bonded to the outer peripheral end of the cone-shaped diaphragm 2 of the
electrodynamic speaker 1, and the bobbin 3b of the voice coil 3 is bonded to the inner peripheral
end. As long as the cone-shaped diaphragm 2 is a member that forms a space on the inner side of
the funnel shape, that is, on the concave side of the cone shape, the material and the shape of the
cone curve do not matter. The cone-shaped diaphragm 2 is a diaphragm that is typically used as
a diaphragm of a speaker, made of paper fibers and made of paper, molded with resin, and made
of resin molded with resin (impregnated with resin using woven or non-woven fabric as a base
material) (Including a resin diaphragm molded), and a diaphragm formed in a cone shape with
another material.
[0032]
The edge 4 may be formed of an edge material used for another electrodynamic speaker, in
addition to one formed by impregnating a phenolic resin with a flexible fiber woven fabric as a
base material. The shape of the edge 4 may be not only the illustrated corrugation edge but also
a roll edge. The outer peripheral side of the edge 4 is fixed to a fixing portion 7 a of the frame 7
described later, and as a result, the cone-shaped diaphragm 2 is supported so as to be capable of
vibrating.
[0033]
The voice coil 3 is formed of a coil 3a to which an audio current is supplied, and a bobbin 3b on
which the coil 3a is wound at one end thereof. The other end of the bobbin 3b on which the coil
3a is not wound is connected to the inner peripheral end of the cone-shaped diaphragm 2 by an
adhesive so that the coil 3a protrudes to the concave side of the cone-shaped diaphragm 2. In
FIG. 1, the lead wire from the coil 3 a and the tinsel wire that conducts the lead wire to the
terminal 15 fixed to the connecting portion 7 c of the frame 7 by soldering are omitted. For the
tinsel wire, a metal eyelet may be provided on the cone-shaped diaphragm 2 so that the terminal
15 can be conducted. Further, the voice coil 3 may be a double voice coil in which the coil 3a is
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double wound corresponding to two audio signal currents.
[0034]
The damper 5 is a corrugation damper which is formed by impregnating a phenolic resin with a
flexible woven fabric of fiber as a base material, and is connected to the other end side of the
bobbin 3b where the coil 3a is not wound. Support the inner peripheral end side of The outer
peripheral end side of the damper 5 is fixed to the fixing portion 7 b of the frame 7. The damper
5 may be formed of another material, or may be a butterfly damper having an arm connecting
the inner ring and the outer ring and formed of metal or resin.
[0035]
The dust cap 6 is connected so as to close the other end of the bobbin 3b of the voice coil 3
where the coil 3a is not wound, and is fixed by an adhesive. In the dust cap 6, a small hole 6b is
provided at the center of the dome portion 6a, and a part of the air present in the space formed
inside the bobbin 3b communicates with the outside air from the small hole 6b. The dust cap 6
may be made of a material that is typically used as a dust cap of a speaker, as with the coneshaped diaphragm 2.
[0036]
The frame 7 is an iron plate frame press-formed into a basket shape, and connects the fixing
portion 7a having a large diameter for fixing the edge 4, the fixing portion 7b having a small
diameter for fixing the damper 5, and the fixing portions 7a and 7b. It includes a connecting
portion 7c, a window 7d defined between the plurality of connecting portions 7c, a mounting
hole 7e (not shown) for mounting the terminal 15 (not shown), and a flange portion 7f extending
from the fixing portion 7a. Therefore, the speaker vibration system including the cone diaphragm
2, the voice coil 3, the edge 4, the damper 5 and the dust cap 6 is vibratably supported on the
frame 7.
[0037]
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The coil 3a of the voice coil 3 wound around the bobbin 3b is disposed such that the bobbin 3b
is bonded to the inner peripheral end of the cone-shaped diaphragm 2 and protrudes to the
concave side of the cone-shaped diaphragm 2. Then, the coil 3 a is similarly disposed on the
concave side of the cone-shaped diaphragm 2 in the magnetic gap of the magnetic circuit 10
disposed in the sub-frame 8 described later. The magnetic circuit 10 comprises a yoke 11, a
magnet 12 fixed to the center of the yoke, a plate 13 fixed to the magnet 12, and a plate 13 fixed
to the plate 13. The yoke 11 and the plate 13 form a repulsive magnetic field with the magnet 12
And a magnet 14 to be generated in the magnetic gap.
[0038]
When a voice current is supplied to the coil 3a of the voice coil 3, a driving force acts on the
voice coil 3, and the voice coil 3 vibrates in the magnetic gap in the vertical direction in FIG. 2
also vibrates in the vertical direction in FIG. The magnetic circuit 10 is an internal magnetic type
magnetic circuit in which a magnet is accommodated inside the bobbin 3b of the voice coil 3 to
be projected, and thus is suitable for a front magnetic circuit type speaker such as the
electrodynamic speaker 1 of the present invention. This is because if the maximum outer
diameter of the yoke 11 can be reduced, the space is formed on the concave side of the coneshaped diaphragm 2.
[0039]
The sub-frame 8 is a press-formed aluminum frame, and is connected to the frame 7 to arrange
the magnetic circuit 10 on the concave side of the cone-shaped diaphragm 2. That is, the subframe 8 includes an opposing wall 8a formed along the concave surface of the cone-shaped
diaphragm 2 and a side wall 8b formed to rise corresponding to the fixed portion 7a of the frame
7; A sound source space opening 8c formed as an open opening between one end and the other
end of the side wall 8b, a magnetic circuit fixing portion 8d to which the magnetic circuit 10 is
fixed, and a sound source space opening 8c are provided. The magnetic circuit 10 is provided
with the flange portion 8 f extended and a plurality of mounting holes 8 g for attaching the sub
frame 8 to another cabinet or the like, and the sub frame 8 is connected to the frame 7. A sound
source space 9a, which is disposed on the concave side of the cone-shaped diaphragm 2, and
causes higher compression and expansion of air as compared with the case where the sound
wave radiated to the concave side of the cone-shaped diaphragm 2 is directly radiated to free
space. , To form a sound guide portion 9 having a sound path 9b which derives to why space.
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[0040]
The sound source space 9 a of the sound conducting portion 9 is defined by the cone-shaped
diaphragm 2 and the edge 4, the opposing wall 8 a and the side wall 8 b of the sub frame 8, the
voice coil 3 and the magnetic circuit 10. . Since the sound source space 9a is a narrow space
defined on the concave side of the cone-shaped diaphragm 2, it causes higher compression and
expansion of air than when the cone-shaped diaphragm 2 radiates directly to free space. The
opposing wall portion 8a of the sub-frame 8 includes a bowl-shaped projecting surface portion in
which the central magnetic circuit fixing portion 8d is recessed and a flat portion having the
same height as the bottom surface of the magnetic circuit fixing portion 8d. It is shaped such that
it is inverted and placed on the concave side of the cone-shaped diaphragm 2.
[0041]
Therefore, the facing wall portion 8a of the sub-frame 8 and the magnetic circuit 10 fixed to the
magnetic circuit fixing portion 8d face the concave surface of the conical diaphragm 2 and act as
an acoustic load. The sound waves in the sound source space 9a are derived to free space
through the sound path 9b. The sound path 9b is defined by a duct body formed by the flange
portion 7f of the frame 7 and the flange portion 8f of the sub frame 8, and an opening opened
between one end and the other end of the side wall portion 8b of the sub frame 8. It
communicates with the sound source space opening 8c formed as and the outlet part becomes
the radiation hole 9c.
[0042]
As described above, the sound conducting portion 9 of the electrodynamic speaker 1 acts to
lower the lowest resonance frequency f0 defining the bass reproduction limit, similarly to the
sound conducting portion of the speaker system of Patent Document 3 described above. The
electrodynamic speaker 1 of the present invention can reproduce sufficient bass even with a
single speaker by providing the sound guiding portion 9. At this time, in the electrodynamic
speaker 1, the magnetic circuit 10 of the front magnetic circuit type speaker is accommodated in
the sound source space 9 a of the sound conducting portion 9. Therefore, the total height H of
the electrodynamic speaker 1 is about 45 mm which is extremely low as an electrodynamic
speaker with a diameter of 16 cm, and can be a speaker suitable for bass reproduction.
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[0043]
When a voice current is supplied to the coil 3a of the voice coil 3 and the cone-shaped
diaphragm 2 vibrates in the vertical direction in FIG. 1, it moves on the concave side of the coneshaped diaphragm 2 in the sound source space 9a of the sound conducting portion 9. The air
suppresses the temperature rise of the magnetic circuit 10 due to the heat generated in the coil 3
b in the sound source space 9 a. Therefore, since the magnetic circuit 10 is accommodated in the
sound source space 9 a of the sound conductor 9, the air moving on the concave side of the coneshaped diaphragm 2 in the sound source space 9 a cools the magnetic circuit 10. In the case of
the present embodiment, since the magnetic gap of the magnetic circuit 10 communicates with
the sound source space 9a, the heat generated by the coil 3a can be dissipated extremely
efficiently.
[0044]
Further, since the sub-frame 8 is formed of aluminum excellent in thermal conductivity and the
magnetic circuit 10 whose temperature rises is attached to the magnetic circuit fixing portion 8 d
of the sub-frame 8, the opposing wall 8 a and the side wall The portion 8 b serves as a heat
dissipating member to further enhance the heat dissipating efficiency. For example, in the case
where the sub-frame 8 is formed by die-casting an alloy containing aluminum, it is possible to
easily provide a fin as a heat-releasing wall on the flat portion of the facing wall portion 8a. If the
surface area of the sub-frame 8 is increased by the fins, the heat dissipation efficiency is further
enhanced. Therefore, the electrodynamic speaker 1 can improve the input-proof performance by
providing the sound conducting part 9 by the sub-frame 8.
[0045]
The air existing in the space 17 formed between the magnet 14 of the magnetic circuit 10 and
the dust cap 6 and the bobbin 3b of the voice coil 3 is compressed and expanded when the space
17 is closed. Works to suppress the vibration of the cone-shaped diaphragm 2. Even though the
magnetic air gap of the magnetic circuit 10 communicates with the sound source space 9a, the
pressure of compression and expansion of air in the sound source space 9a is high, and it is
preferable that compression and expansion of high pressure air occur in the space 17 Absent.
Therefore, it is preferable that a part of the air present in the space 17 communicate with the
external air by providing the small hole 6b at the center of the dome portion 6a of the dust cap 6,
or providing a through hole in the magnetic circuit 10.
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[0046]
FIG. 2 is a view for explaining a slot machine 20 of a game machine as an example of an
apparatus to which the dynamic motion type speaker 1 of the first embodiment is attached. FIG.
2 (a) is a front view of the slot machine 20, and FIG. 2 (b) is a side view (a part of which is a
cross-sectional view taken along the line A-A ') of the slot machine 20. In addition, the structure
of a part of slot machine 20 unnecessary for description, an internal structure, etc. are abbreviate
| omitted except the thing mentioned later.
[0047]
The slot machine 20 includes a housing 21 to which the reels 23a to 23c, the medal processor
29 and the like are attached, and a door 22 provided on the front side of the housing 21 and
facing the player when closed. Have. When the door 22 is opened, maintenance of the housing
21 and assembly of internal parts can be performed. A reel window 23, a medal insertion hole
24, a switch 25, a display 26, and a medal discharge hole 27 are attached to the door 22.
[0048]
In the slot machine 20, when playing, when the player inserts a medal into the medal insertion
hole 24 and presses the start button 25s, the reels 23a to 23c start rotating, and when the stop
buttons 25a to 25c are pressed, the respective reels 23a to 23c. Stop rotating. A plurality of
symbols are printed on the reels 23a to 23c, and medals are discharged from the medal
processor 29 through the medal discharge holes 27 from the arrangement of the symbols when
the reels 23a to 23c are stopped. Control of the game is performed by a control circuit (not
shown) including a CPU, a memory and the like.
[0049]
On the door 22 of the slot machine 20, the left speaker 31, the right speaker 32, and the
radiation hole 30 of the electrodynamic speaker 1 of the first embodiment are attached. The
audio signal output from the control circuit is amplified by an amplifier circuit (not shown) and
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supplied to the left speaker 31, the right speaker 32, and the electrodynamic speaker 1 of the
first embodiment. The left speaker 31 and the right speaker 32 are respectively disposed on the
front left and the right of the player, and the radiation holes 30 for emitting the sound waves
derived from the sound conducting part 9 of the electrodynamic speaker 1 are switches operated
by the player by hand. It is formed near the lower part of 25. It should be noted that in the left
speaker 31, the right speaker 32, and the radiation hole 30, there is a breathable protection net
or the like so that foreign objects will not collide with the diaphragm or the medal etc. will be
inserted erroneously. It is preferable to provide a grill.
[0050]
The electrodynamic speaker 1 is fixed to a mounting member 28 provided inside the housing 21
with a screw via a mounting hole 8 g of the sub frame 8. Since the sound conducting portion 9 is
formed in the electrodynamic speaker 1, the sound wave in the sound source space 9a radiated
to the concave side of the cone-shaped diaphragm 2 is a duct body defining the sound path 9b
(of the frame 7 It is led out to a free space, that is, toward the player through the substantially
square prism-shaped duct 33 connected to the flange portion 7 f and the flange portion 8 f of the
sub frame 8 and the radiation hole 30. The duct 33 connected to the radiation hole 30 is
attached to the door 22, and is connected to the sound path 9b of the sound conducting portion
9 of the electrodynamic speaker 1 attached to the housing 21 when the door 22 is closed. Do. On
the other hand, the sound wave radiated to the convex side of the cone-shaped diaphragm 2, that
is, the sound wave radiated to the opposite side to the concave side is radiated to the inside of
the housing 21 through the window 7 d of the frame 7. The air in the space acts as an acoustic
volume in the speaker system.
[0051]
Therefore, the slot machine 20 of the present embodiment is excellent in bass reproduction
ability and can provide a player with a powerfully reproduced sound. Further, since the radiation
hole 30 is formed in the vicinity of the lower part of the switch 25 operated by the player by
hand, it is easy for the game player to feel the air drawn out from the radiation hole 30 and
intended by the game control of the slot machine 20 The presentation effect can be reliably
transmitted to the player.
[0052]
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At this time, the dynamic height speaker 1 has a total height H of only about 45 mm, even if it is
a large 16 cm aperture as a speaker used for a game machine such as a slot machine. The
electrodynamic speaker 1 does not project the magnetic circuit 10 of the electrodynamic speaker
1 on the opposite side of the sound conducting portion 9, that is, to the space on the inner side of
the housing 21. As described above, a slight space between the reel 23 b and the token processor
29 can be utilized to be disposed in the inner side space of the housing 21.
[0053]
In the slot machine 20 of this embodiment, the electrodynamic speaker 1 is attached such that
the cone diaphragm 2 vibrates in the vertical direction, and the duct 33 connecting the sound
path 9b and the radiation hole 30 has a substantially square pole shape. Although a duct is used,
a duct bent in any direction may be used if there is a restriction in the direction of mounting the
electrodynamic speaker 1 or the like. For example, in the case where the electrodynamic speaker
1 is attached not to the housing 21 but to the back surface side of the door 22, the duct 33 may
have a right-angled bent portion.
[0054]
FIG. 3 is a side sectional view illustrating an electrodynamic speaker 70 according to another
preferred embodiment of the present invention. Note that parts common to the electrodynamic
speaker 1 of the first embodiment are given the same reference numerals, and a part of the
electrodynamic speaker 70, an internal structure, and the like are omitted.
[0055]
The electrodynamic speaker 70 includes the electrodynamic speaker 1 according to the first
embodiment and the cone diaphragm 2 except that the sub-frame 80 is formed to also serve as
the yoke that constitutes the magnetic circuit 10. The configurations of the voice coil 3, the edge
4, the damper 5 and the frame 7 are almost the same. The most different is that the sub-frame
80 is press-formed with a high permeability iron plate, and the magnetic air gap of the magnetic
circuit 10 is the opposing wall body 80 a of the sub-frame 80 and the plate 13 forming the
magnetic circuit. It is what is defined between. That is, the magnetic circuit 10 is fixed to the sub
frame 80, the magnet 12 fixed to the magnet fixing portion 80d of the sub frame 80, the plate 13
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fixed to the magnet 12 and the plate 13, and the repulsive magnetic field And a magnet 14 to be
generated in the magnetic gap.
[0056]
Therefore, the electrodynamic speaker 70 according to the present embodiment, like the
electrodynamic speaker 1 according to the first embodiment, not only realizes a speaker suitable
for bass reproduction with a low overall height H, but the number of components It is possible to
reduce the overall weight and cost. Since the magnetic circuit 10 is integrally formed with the
sub-frame 80 forming the sound conducting portion 9, it is accommodated in the sound source
space of the sound conducting portion 9, and the heat generated by the coil 3a is dissipated
extremely efficiently. . Further, since the sub-frame 80 is formed of an iron plate having excellent
thermal conductivity, the heat of the magnetic circuit 10 is transmitted from the magnet fixing
portion 80 d to the sub-frame 80 and dissipated from the surface thereof into the air. The inputproof performance of the electrodynamic speaker 70 can be improved.
[0057]
4 and 5 illustrate a speaker system 100 according to a preferred embodiment of the present
invention. FIG. 4A is a perspective view of the speaker system 100 obliquely viewed from the
bottom side, and FIG. 4B is an oblique view from the bottom side of the components of the
speaker system 100 arranged in order. It is a disassembled perspective view. 5 (a) is a side crosssectional view of the front magnetic circuit type speaker 40 constituting the speaker system 100,
in which the parts common to the electrodynamic speaker 1 of the first embodiment are assigned
the same reference numerals. ing. 5B is a side cross-sectional view of the sound guide member
50 connected to the front magnetic circuit type speaker 40. As shown in FIG. In addition, the
structure of a part of speaker system 100, an internal structure, etc. are abbreviate | omitted.
[0058]
The speaker system 100 of this embodiment is a subwoofer in which a front magnetic circuit
type speaker 40 with a diameter of 16 cm is housed in a cabinet 60 whose outer dimensions are
slightly about 18 cm, depth: about 18 cm, and height: about 5 cm. The cabinet 60 is composed of
a baffle 61 molded of resin and a box 62. The front magnetic circuit type speaker 40 is attached
to the attachment portion 61e of the baffle 61, and the speaker system 100 is configured by
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attaching the sound conducting member 50 to the concave side of the cone type diaphragm 2 of
the front magnetic circuit type speaker 40. . The top surface side (sub frame 41 described later)
of the front magnetic circuit type speaker 40 attached to the baffle 61 is fitted to the opening
opened on the top surface side of the box 62, and the inside of the box 62 is Form an enclosed
space.
[0059]
In the front magnetic circuit type speaker 40, the electrodynamic speaker 1 of Example 1, the
cone type diaphragm 2, the voice coil 3, the edge except that the concave side of the cone type
diaphragm 2 is directed to the lower side. The configurations of the damper 4, the frame 7, and
the magnetic circuit 10 are almost the same. What is most different is the configuration of the
sub frame 41 in which the magnetic circuit 10 is disposed on the concave side of the coneshaped diaphragm, and the sub frame 41 fixes the magnetic circuit 10 from the inner space side
of the bobbin of the voice coil 3 .
[0060]
Specifically, the sub-frame 41 has a pedestal frame 42 coupled to the fixing portion 7 b of the
frame 7, and a convex pedestal 43 coupled to the pedestal frame 42 and projecting a convex
portion to the internal space side of the bobbin of the voice coil 3. , And a screw hole 44 is
formed at the center of the convex portion of the convex pedestal 43. The pedestal frame 42 is a
press-molded iron plate frame, and the convex pedestal 43 is a molded product formed of a
nonmagnetic material such as resin or aluminum. Then, the magnetic circuit 10 is fixed to the
screw hole 44 of the convex portion of the convex pedestal 43 by the long screw 45 of the
nonmagnetic material.
[0061]
The frame 7 of the front magnetic circuit type speaker 40 further includes a mounting portion 7g
extended outward from the fixing portion 7a having a large diameter. The front magnetic circuit
type speaker 40 is attached to the attachment portion 61e of the baffle 61 with a screw (not
shown) via the attachment portion 7g. At this time, the sound guiding member 50 is also
attached at the same time.
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[0062]
The sound guiding member 50 has substantially the same configuration as the sub frame 8 in the
electrodynamic speaker 1 of the first embodiment. That is, the sound conducting member 50 is a
press-formed aluminum frame, and the opposite wall body 50a, the side wall 50b, and the side
wall 50b are formed along the concave surface of the cone-shaped diaphragm 2. A sound source
space opening 50c formed as an open opening between one end and the other end, a magnetic
circuit housing portion 50d for containing the magnetic circuit 10, and a flange portion extended
to a place where the sound source space opening 50c is provided 50f and a plurality of
attachment holes 50g for attaching the sound guide member 50 to another cabinet or the like.
Therefore, by connecting the sound guide member 50 to the frame 7, the magnetic circuit 10 is
disposed on the concave side of the cone-shaped diaphragm 2, and the sound wave radiated to
the concave side of the cone-shaped diaphragm 2 is directly transferred to free space. A sound
conducting portion 9 is formed having a sound source space 9a that causes higher compression
and expansion of air than when it is radiated, and a sound path 9b that leads to free space.
[0063]
The sound source space 9 a of the sound conducting portion 9 is defined by the cone diaphragm
2 and the edge 4, the opposing wall 50 a and the side wall 50 b of the sound conducting member
50, the voice coil 3 and the magnetic circuit 10. Because of the narrow space defined on the
concave side of the cone-shaped diaphragm 2, higher compression and expansion of air occur as
compared with the case where the cone-shaped diaphragm 2 radiates directly to free space. The
facing wall portion 50 a of the sound conducting member 50 and the magnetic circuit 10 fixed to
the magnetic circuit housing portion 50 d face the concave surface of the cone-shaped
diaphragm 2 and act as an acoustic load. The sound waves in the sound source space 9a are
derived to free space through the sound path 9b. The sound path 9b is formed by the sound path
portion 61f of the baffle 61 and the flange portion 50f of the sound conducting member 50, and
is formed as an open opening between one end and the other end of the side wall portion 50b.
And the outlet portion becomes the radiation hole 9c.
[0064]
As described above, the sound conducting portion 9 of the speaker system 100 of the present
embodiment acts to lower the lowest resonance frequency f0 defining the bass reproduction
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limit, similarly to the sound conducting portion of the speaker system of Patent Document 3
described above. Do. The speaker system 100 is provided with the sound conducting portion 9
substantially formed by the front magnetic circuit type speaker 40 and the sound conducting
member 50, so that even a thin and small speaker system having a low overall height can provide
sufficient bass. It can be played back.
[0065]
In the speaker system 100 of the present embodiment, the magnetic circuit 10 of the front
magnetic circuit type speaker 40 is accommodated in the sound source space 9 a of the sound
conducting portion 9, and the volume of the cabinet 60 corresponding to the convex side of the
cone type diaphragm 2 is The acoustic capacity of the system 100 can be used, and as a result,
the overall height H of the speaker system 100 can be reduced. Even if the sound guiding
member 50 is provided, the total height H of the speaker system 100 increases only about 1 cm
in addition to the total height of the cabinet 60. As a speaker system using an electrodynamic
speaker with a diameter of 16 cm, it is possible to realize an extremely low about 6 cm and to be
suitable for bass reproduction.
[0066]
Also in the speaker system 100 of the present embodiment, since the magnetic circuit 10 of the
front magnetic circuit type speaker 40 is accommodated in the sound source space 9 a of the
sound conducting portion 9, the cone type diaphragm 2 in the sound source space 9 a The air
moving on the concave side cools the magnetic circuit 10 in the same manner. Since the
magnetic gap of the magnetic circuit 10 is in communication with the sound source space 9a, the
heat generated by the coil 3a can be dissipated extremely efficiently.
[0067]
In addition, the speaker system 100 according to the present embodiment is only required to
include the front magnetic circuit type speaker 40, and means for disposing the magnetic circuit
10 of the front magnetic circuit type speaker 40 on the concave side of the cone type diaphragm
2 Is not limited to the form of the sub-frame 41 of this embodiment. Of course, even if the subframe 41 arranges the magnetic circuit 10 on the concave side of the cone-shaped diaphragm 2
by a fixing member provided to bridge the large-diameter fixing portion 7a of the frame 7 in a
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cross shape. Good.
[0068]
In addition, the magnetic circuit 10 of the electrodynamic speaker 1 and the front magnetic
circuit type speaker 40 described in the above embodiment is an inner magnetic type magnetic
circuit provided with a repulsive magnet which can easily reduce its external dimensions. The
configuration of is not limited to this embodiment. The magnetic circuit 10 may be an external
magnet type magnetic circuit as long as its outer dimensions fit on the concave side of the cone
type diaphragm 2, or may be a repulsive type magnetic circuit without the yoke 11.
[0069]
The electrodynamic speaker 1 of the present invention can be applied not only to a speaker built
into a game machine such as a slot machine but also to an audiovisual apparatus such as a
display having a cabinet incorporating a speaker for reproducing audio. . Further, since the
speaker system 1 can realize a subwoofer that reproduces bass in a small and thin cabinet with a
low overall height, the speaker system 1 is particularly suitable for a vehicle speaker having a
limited installation space.
[0070]
It is a figure explaining the electrodynamic-type speaker 1 by preferable embodiment of this
invention. (EXAMPLE 1) A diagram illustrating a slot machine 20 provided with an
electrodynamic speaker 1 according to a preferred embodiment of the present invention.
(Example 2) A diagram illustrating an electrodynamic speaker 70 according to a preferred
embodiment of the present invention. (Example 3) A speaker system 100 according to a
preferred embodiment of the present invention will be described. (Example 4) It is a figure
explaining the speaker 40 and the sound guide member 50 which comprise the speaker system
100 by preferable embodiment of this invention. (Example 4)
Explanation of sign
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[0071]
DESCRIPTION OF SYMBOLS 1 Electrodynamic type speaker 2 Cone type diaphragm 3 Voice coil
4 Edge 5 Damper 6 Dust cap 7 Frame 8 Subframe 9 Sound conductor part 10 Magnetic circuit
20 Slot machine 21 Case 22 Door body 23 Reel 30 Radiation hole 33 Duct 40 Front surface
Magnetic circuit type speaker 41 sub frame 50 sound conducting member 60 cabinet 70
electrodynamic speaker 80 sub frame 100 speaker system
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