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JP2015103825

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DESCRIPTION JP2015103825
PROBLEM TO BE SOLVED: To provide a thin speaker system which has an electrodynamic
speaker and a cabinet and is excellent in sound reproduction capability. A speaker system
includes an electrodynamic speaker including a diaphragm and a magnetic circuit, a cabinet
having an electrodynamic speaker attached thereto and defining an internal space serving as an
acoustic capacity on the magnetic circuit side of the diaphragm. And a repelling magnet mounted
at a corresponding position of the cabinet at a distance from a rear end of the magnetic circuit of
the speaker to generate a repulsive force due to a repulsive magnetic field between the magnetic
circuit and the magnetic circuit. [Selected figure] Figure 1
スピーカーシステム
[0001]
The present invention relates to a thin speaker system that includes an electrodynamic speaker
and a cabinet and is excellent in sound reproduction capability.
[0002]
In audio equipment to which an electrodynamic speaker for reproducing sound is attached, it is
demanded to miniaturize a space occupied by a speaker system including a cabinet to which the
electrodynamic speaker is attached.
In particular, in a speaker system or subwoofer that reproduces a long wavelength low frequency
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band, there is a problem that it is basically not easy to miniaturize a cabinet that defines acoustic
capacity. In the speaker system, regardless of the closed cabinet or the bass reflex (phase
inversion) cabinet, when the acoustic capacity of the cabinet is small, the lowest resonance
frequency f0 defining the bass limit frequency of the electrodynamic speaker is increased. .
[0003]
In addition, in order to miniaturize the cabinet of the speaker system, there is a speaker system
employing a thin cabinet in which the dimensions of the substantially rectangular cabinet in one
direction (thickness direction and height direction) are relatively shortened (patented Literature
1). However, in such a case, the dimensions in the other directions may be long in the opposite
direction, and the strength of the speaker cabinet may be insufficient, which may cause a
problem that a wide baffle surface resonates (Patent Document 2). In order to ensure the rigidity
of the cabinet of the speaker system provided with the electrodynamic speaker, the front and
rear baffle surfaces are connected by a reinforcing member, or connected to a part of the cabinet
to support the magnetic circuit of the electrodynamic speaker In the past, measures have been
adopted.
[0004]
In addition, in the case of an electrodynamic speaker, a repulsive magnet (or cancel magnet) may
be attached to a magnetic circuit in order to improve the magnetic flux density of the magnetic
circuit and the magnetic shield of the magnetic circuit. In the speaker system, although there is a
prior art in which any magnet is attached to the cabinet (Patent Document 3), the repulsive
magnet is usually attached to the magnetic circuit of the electrodynamic speaker and attached to
the cabinet There is nothing to be done.
[0005]
Patent No. 4923657 Unexamined-Japanese-Patent No. 60-19392 Unexamined-Japanese-Patent
No. 2005-27286
[0006]
However, in a speaker system employing a thin cabinet, conventional measures such as
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connecting the baffles of the front and back with reinforcing members to secure the rigidity of
the cabinet, and connecting the magnetic circuit of the dynamic speaker to a part of the cabinet
There is a problem that the manufacturing process becomes complicated and the cost is
increased.
When the strength of the thin cabinet is insufficient, the wide front baffle or the back baffle
resonates as described above to cause a peak dip in the sound pressure frequency characteristic,
which may cause a problem that the reproduction sound quality is deteriorated.
[0007]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to provide a thin speaker system having an electrodynamic speaker and a
cabinet and having excellent sound reproduction capability. .
[0008]
The speaker system according to the present invention includes an electrodynamic speaker
including a diaphragm and a magnetic circuit, a cabinet having an electrodynamic speaker
attached and defining an internal space serving as an acoustic capacity on the magnetic circuit
side of the diaphragm, and the electrodynamic speaker And a repelling magnet mounted at a
corresponding position of the cabinet spaced apart from the rear end of the magnetic circuit to
generate a repulsive force due to a repulsive magnetic field between the magnetic circuit and the
magnetic circuit.
[0009]
Preferably, in the speaker system of the present invention, the cabinet has a front baffle to which
the electrodynamic speaker is attached, a back baffle to which the repelling magnet is attached,
and a side baffle connecting the front baffle and the back baffle.
[0010]
Preferably, in the speaker system of the present invention, the electrodynamic speaker is an
external magnet type magnetic circuit in which an annular magnet is disposed outside a space
defined by a voice coil, and the repulsive magnet is an annular magnet of the external magnet
type magnetic circuit. The ring magnet has a shape substantially similar to that of the ring
magnet, and is disposed on a substantially concentric circle with respect to the external magnet
type magnetic circuit and attached to the cabinet.
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[0011]
Preferably, in the speaker system of the present invention, the cabinet has a mounting member
for mounting the repelling magnet on the back baffle, and the mounting member changes the
separation distance from the rear end of the magnetic circuit of the dynamic speaker to the
repelling magnet Separation distance adjustment mechanism.
[0012]
Hereinafter, the operation of the present invention will be described.
[0013]
The speaker system of the present invention includes an electrodynamic speaker including a
diaphragm and a magnetic circuit, and a cabinet having an electrodynamic speaker attached and
defining an internal space serving as an acoustic capacity on the magnetic circuit side of the
diaphragm.
Furthermore, the speaker system comprises repulsive magnets mounted at corresponding
positions of the cabinet, spaced from the rear end of the dynamic circuit of the dynamic speaker.
By providing the repulsion magnet, the speaker system has an advantage that the leakage flux is
reduced and the magnetic flux density in the magnetic gap of the magnetic circuit is increased, as
a result, the reproduced sound pressure level can be increased.
[0014]
A repulsive magnet attached to the cabinet generates a repulsive force due to a repulsive
magnetic field between the reluctance magnetic circuit of the electrodynamic speaker, so that a
reinforcement member is used to connect to a part of the cabinet to support the magnetic circuit.
Therefore, the rigidity of the cabinet of the speaker system provided with the electrodynamic
speaker can be secured without adopting the method of the prior art.
Although the repulsive force resulting from the repulsive magnetic field has a smaller acting
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force as compared with the case of using the reinforcing member, the rigidity can be sufficiently
improved to suppress the vibration of the cabinet.
[0015]
In particular, if the cabinet has a front baffle on which the electrodynamic speaker is mounted, a
back baffle on which the repelling magnet is mounted, and a side baffle connecting the front
baffle and the back baffle, a thin speaker system is realized. Since the repulsive force caused by
the repulsive magnetic field acts between the front baffle and the back baffle, which tends to
have a large area, in this case, the oscillation of the front baffle and the back baffle is suppressed
to suppress the occurrence of resonance. be able to.
In thin speaker systems, the front baffle and the back baffle vibrations have a relatively high rate
of affecting the reproduced sound quality, which is very effective in enhancing the reproduced
sound quality.
[0016]
Further, in the case where the electrodynamic speaker is an external magnet type magnetic
circuit in which the annular magnet is disposed outside the space defined by the voice coil, the
repulsive magnet is substantially similar to the annular magnet of the external magnet type
magnetic circuit. The ring magnet is preferably disposed concentrically with the external magnet
type magnetic circuit so as to be attached to the cabinet.
Since the external magnet type magnetic circuit has a large amount of leakage magnetic flux, it is
easy to exert a desired repulsive force if the repulsive magnets are arranged substantially
concentrically.
In addition, since a magnet similar to a repulsive magnet such as direct attachment to an
electrodynamic speaker can be used, it is advantageous in terms of manufacturing cost, and a
magnetic circuit of an electrodynamic speaker in which front and rear baffle plates are connected
by a reinforcing member The manufacturing process is simpler and the cost increase can be
suppressed, compared to adopting conventional measures such as connecting to a part of.
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[0017]
In addition, the cabinet has a mounting member for mounting the repelling magnet on the back
baffle, and the mounting member is a separation distance adjusting mechanism that changes the
separation distance from the rear end of the magnetic circuit of the dynamic speaker to the
repelling magnet. If it has, there is an advantage that it becomes easier to apply a desired
repulsive force by adjusting the separation distance.
[0018]
The speaker system of the present invention can provide a thin speaker system that includes an
electrodynamic speaker and a cabinet and is excellent in sound reproduction capability.
[0019]
It is a perspective view explaining speaker system 1 of the present invention.
Example 1
[0020]
Hereinafter, a speaker system according to a preferred embodiment of the present invention will
be described, but the present invention is not limited to these embodiments.
[0021]
FIG. 1 is a view for explaining a speaker system 1 according to a preferred embodiment of the
present invention.
Specifically, FIG. 1 (a) is a front view of the speaker system 1, and FIG. 1 (b) is a side BB ′
sectional view for explaining the configuration of the speaker system 1, and FIG. ) Is a rear view
in which the internal structure of the speaker system 1 is partially transparent.
In addition, in FIG. 1, it has illustrated except the one part components and structure which are
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unnecessary for description.
[0022]
The speaker system 1 according to the present embodiment is a subwoofer in which an
electrodynamic speaker 10 with a diameter of about 20 cm is attached to a relatively thin
substantially rectangular cabinet 2. The cabinet 2 relatively shortens the dimension in the
thickness direction, which is also the direction in which the diaphragm of the electrodynamic
speaker 10 vibrates, while relatively lengthening the dimension in the lateral direction to
increase the volume of the internal space of the cabinet 2 By making it large, it has a desirable
acoustic capacity to reproduce a long wavelength low frequency band. In the case of the present
embodiment, a bass reflex duct 4 is attached to the cabinet 2 to constitute a bass reflex (phase
inversion) type cabinet suitable for a subwoofer.
[0023]
The cabinet 2 is a top plate which is a side baffle connecting the front baffle 21 with the back
baffle 22 and the front baffle 21 with the electrodynamic speaker 10 attached to the circular
hole, the back baffle 22 with the repulsive magnet 3 described later attached. And 23, a side
plate 24, a bottom plate 25 and a side plate 26. The cabinet 2 of the present embodiment utilizes
a medium density fiber board (MDF board (Medium Density Fiberboard)) with a thickness of 12
mm. Although the bass reflex duct 4 is attached to the side plate 24, it may be attached to the
other surface of the cabinet 2, or may be omitted when configuring a closed cabinet.
[0024]
The electrodynamic speaker 10 is an electrodynamic speaker having a cone-shaped diaphragm
12 and an external magnet type magnetic circuit 14. The diaphragm 12 is supported at its outer
peripheral end by an edge, and the outer peripheral end of the edge is fixed to the frame 11. In
addition, the frame 11 is substantially in the shape of a basket corresponding to the cone-shaped
diaphragm 12, and the magnetic circuit 14 is fixed to the opening on the back side of the frame
11. A substantially cylindrical voice coil 13 is connected to the inner circumferential end of the
diaphragm 12 from the back side. The voice coil 13 has a coil wound around a cylindrical
bobbin, is connected to a tinsel wire (or lead wire) (not shown), and is supplied with an audio
signal.
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[0025]
The magnetic circuit 14 of the electrodynamic speaker 10 of the present embodiment is an
external magnet type magnetic circuit including an annular magnet 15 disposed outside the
space defined by the voice coil 13. The magnetic circuit 14 includes an annular magnet 15, an
annular top plate connected to the upper surface side of the magnet 15, and a pole piece
including an under plate connected to the lower surface side of the magnet 15. The magnetic
circuit 14 forms an annular magnetic air gap between the inner periphery with the top plate and
the side wall of the protruding pole piece. Since a magnetic field exhibiting a high magnetic flux
density is formed in the magnetic gap, in the electrodynamic speaker 10, the coil of the voice coil
13 is disposed in the magnetic gap. When an audio signal is supplied to the coil of the voice coil
13, the voice coil 13 in the magnetic field receives a driving force, and hence the diaphragm 12
supported vibratably by the damper and the edge with respect to the frame 11 and the magnetic
circuit 10. It vibrates and as a result, it is possible to reproduce the sound.
[0026]
The electrodynamic speaker 10 is attached to the cabinet 2 by inserting screws (not shown) into
frame attachment holes (not shown) provided in the frame 11 and screwing these screws to the
front baffle 21. Therefore, the space before and after the diaphragm 12 of the electrodynamic
speaker 10 is separated, and the internal space to be the acoustic capacity is defined on the
magnetic circuit 14 side of the diaphragm 12. It will not be canceled, and the speaker system 1
will be able to reproduce low frequencies.
[0027]
Further, a repulsive magnet 3 is attached to the back baffle 22 of the cabinet 2. The repelling
magnet 3 is an annular magnet substantially similar in shape to the magnet 15 included in the
external magnetic type magnetic circuit 14 of the dynamic dynamic speaker 10. The repelling
magnet 3 is attached to the back surface baffle 22 via an adhesive or other fixing member, and
its position is separated from the rear end of the magnetic circuit 14 of the electrodynamic
speaker 10 by a distance equal to or larger than a predetermined dimension d. And are arranged
substantially concentrically with the magnet 15.
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[0028]
Further, the repelling magnet 3 is magnetized in the opposite direction to the magnet 15 of the
magnetic circuit 14 so as to generate a repelling force due to the repelling magnetic field
between the repelling magnet 3 and the magnetic circuit 14 of the electrodynamic speaker 10.
For example, when the magnet 15 of the magnetic circuit 14 of the electrodynamic speaker 10 is
magnetized such that the front side provided with the diaphragm 12 is N pole and the opposite
back side is S pole. In the back surface side of the magnetic circuit 14, the leakage flux on the S
pole side occurs. Therefore, the repulsive magnet 3 is magnetized such that the surface facing
the back side of the magnetic circuit 14 of the dynamic speaker 10 is the S pole, and the surface
connected to the opposite back surface baffle 22 is the N pole. Fix to 2 By doing so, the repelling
magnet 3 can generate a repelling force due to the repelling magnetic field between the repelling
magnet 3 and the magnetic circuit 14 of the electrodynamic speaker 10. When the magnetic
poles of the electrodynamic speaker 10 are opposite, the magnetic poles of the repelling magnet
3 may be reversed.
[0029]
When a repulsive force caused by a repulsive magnetic field is generated between the magnetic
circuit 14 of the electrodynamic speaker 10 and the repelling magnet 3, the front baffle 21 to
which the electrodynamic speaker 10 is attached and the repelling magnet 3 are attached. An
opposing force acts between the rear baffles 22 that are located. Then, near the center of the
front baffle 21 and the back baffle 22 having a large area, a force that expands from the inside to
the outside of the cabinet 2 acts to secure the rigidity of the cabinet 2, and as a result, the cabinet
The rigidity can be sufficiently improved in order to suppress the vibration generated in 2.
[0030]
In particular, in the speaker system 1 provided with the thin cabinet 2, since the ratio at which
the vibration of the front baffle 21 and the back baffle 22 affects the reproduction sound quality
is relatively high, the repulsive magnet 3 is provided as in this embodiment. Is very effective in
enhancing playback sound quality. Further, by providing the repelling magnet 3, the magnetic
circuit 14 of the electrodynamic speaker 10 reduces the leakage flux, and the magnetic flux
density in the magnetic gap of the magnetic circuit 14 increases. As a result, the speaker system
1 has an advantage that the reproduction sound pressure level can be increased.
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[0031]
Further, as in the present embodiment, in the case where the electrodynamic speaker 1 includes
the external magnetic type magnetic circuit 14, the repelling magnet 3 is an annular magnet
substantially similar to the annular magnet 15 to form the magnetic circuit 14. On the other
hand, it is preferable to arrange them substantially concentrically so as to be attached to the
cabinet 2. Since the external magnetic type magnetic circuit 14 has a large amount of leakage
magnetic flux, it is possible to exert a desired repulsive force only by adjusting the separation
distance d if the repelling magnet 3 is disposed substantially concentrically. In addition, since it
can be used as a repelling magnet 3 similar to a canceling magnet that is directly attached to the
electrodynamic speaker 1, it is advantageous in terms of manufacturing cost. The manufacturing
process is simpler and the cost increase can be suppressed as compared to adopting
conventional measures such as connecting the front and rear baffle plates with a reinforcing
member and connecting the dynamic circuit of the dynamic speaker to a part of the cabinet. it
can.
[0032]
However, if the separation distance d between the rear end of the magnetic circuit 14 of the
electrodynamic speaker 10 and the repelling magnet 3 is larger than a predetermined dimension
and separated too much, the repulsive force becomes small and is smaller than the
predetermined dimension If it is too close, it acts not as a repulsive force but as an attractive
force. Therefore, it is preferable to set an optimal distance d that maximizes the repulsive force
acting therebetween.
[0033]
Preferably, a fixing member for attaching the repelling magnet 3 to the back surface baffle 22 of
the cabinet 2 is provided so that the position of the repelling magnet 3 can be moved, and the
distance d from the rear end of the magnetic circuit 14 of the electrodynamic speaker 10 Should
be adjustable. The fixed member of the repulsive magnet 3 has one side attached to the back
surface baffle 22 of the cabinet 2 and the other side attached to the repulsive magnet 3 is
movable by a screw or the like, and the screw can be rotated to adjust the separation distance d
You should do it.
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[0034]
In addition, although the cabinet 2 of the above embodiment uses a medium density fiber board,
it may be a cabinet member of another material, preferably, thermoplastic resin such as ABS
resin, or other resin It may be a member.
[0035]
In addition, although the electrodynamic speaker 10 of the above-described embodiment is
provided with a circular cone-shaped diaphragm, the electrodynamic speaker 10 is also
applicable to an elongated speaker having a short diameter direction shorter than the long
diameter direction.
In the case of a small speaker having a large area of a cabinet to be attached, an undesirable
reduction in vibration of the cabinet and a reduction in reproduction sound quality can be
reduced, and a speaker with stable operation can be realized.
[0036]
The speaker system of the present invention is applicable not only to subwoofers and small-sized
speakers, but also to speaker systems that reproduce middle and high tones.
[0037]
Reference Signs List 1 speaker system 2 cabinet 3 repulsive magnet 4 bass reflex duct 10
electrodynamic speaker 11 frame 12 diaphragm 13 voice coil 14 magnetic circuit 15 magnet 21
front baffle 22 back baffle 23 top plate 24, 26 side plate 25 bottom plate
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