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JPH0918992

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DESCRIPTION JPH0918992
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit used for various audio equipment.
[0002]
2. Description of the Related Art First, an example of the configuration of a conventional speaker
unit will be described with reference to FIG. The speaker unit 41 shown in the figure is a socalled external magnet type speaker unit having an aperture of about 10 cm and includes a
support plate 45 having a center pole 44 projecting upward at the center, and is fitted to the
center pole 44. An annular magnet 46 mounted on and fixed to the support plate 45 and an
annular top plate 47 mounted on and fixed to the magnet 46 are provided. A magnetic circuit
unit 48 is configured by the support plate 45, the magnet 46, and the upper plate 47 described
above.
[0003]
A cylindrical coil bobbin 43 having an inner diameter slightly larger than the outer diameter of
the center pole 44 is vertically movably fitted to the upper portion of the center pole 44, and a
lead is provided outside the coil bobbin 43. A wire is wound to form a voice coil 42. One end of a
damper 50 is joined to the upper side surface of the coil bobbin 43, and the other end of the
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damper 50 is joined to a frame 49 mounted and fixed on the upper plate 47.
[0004]
Further, the lower peripheral edge portion of the diaphragm 51 formed so that the inner
diameter is gradually expanded upward is joined to the outer periphery of the side surface upper
portion of the coil bobbin 43, and the upper peripheral edge portion of the diaphragm 51 is It is
connected to the rim of the frame 49 by a ring-shaped edge 52 and a gasket 53. Furthermore, on
the upper part of the coil bobbin 43, a dustproof cap 54 for covering the dust and the like is
covered.
[0005]
Here, for example, a barium ferrite magnet with an outer diameter of 60 mm, an inner diameter
of 32 mm, and a thickness of 10 mm is used as the magnet 46 described above, and its maximum
energy is 0.8 J and its weight is about 100 g.
[0006]
In addition to the above external magnet type speaker unit, a speaker unit using a so-called
radially magnetized magnet (hereinafter referred to as a radial magnetized type) is also known.
Hereinafter, an example of a conventional radially magnetized speaker unit will be described with
reference to FIG.
[0007]
The speaker unit 61 shown in the figure includes a support plate 63 having a cylindrical support
base 62 projecting upward in the center, and a cylindrical magnet 64 mounted on and fixed to
the support base 62. A magnetic circuit portion 65 is formed by the support plate 63 and the
magnet 64. Further, the lower end side of the frame 69 is fixed to the support plate 63.
[0008]
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A cylindrical coil bobbin 66 having an inner diameter slightly larger than the outer diameter of
the magnet 64 is vertically movably fitted to the magnet 64, and a lead wire is wound around the
coil bobbin 66. The voice coil 67 is formed. One end of a damper 68 is joined to the upper side of
the coil bobbin 66, and the other end of the damper 68 is joined to the frame 69.
[0009]
The lower peripheral edge of the diaphragm 70 formed so that the inner diameter is gradually
expanded upward is joined to the outer periphery of the upper side of the coil bobbin 66, and the
upper peripheral edge of the diaphragm 70 is It is connected to the peripheral edge of the frame
69 via a ring-shaped edge 71 and a gasket 72. Furthermore, a dustproof cap 73 is placed on the
upper portion of the coil bobbin 66 to prevent adsorption of dust and the like.
[0010]
As the magnet 64, for example, a magnet having a diameter of 20 mm and a thickness of 10 mm
and containing, for example, neodymium (Nd) as a main component is used. The magnet 64 has a
mass of 23.6 g and a maximum energy of 1.0 J, and has a maximum energy larger than that of
the magnet used in the above-mentioned conventional external magnet type speaker unit.
[0011]
The above-described conventional radially magnetized speaker unit 61 has an advantage of being
able to reduce the weight of the entire unit since the number of parts can be reduced as
compared with the above-described speaker unit 41 of external magnet type.
[0012]
However, when comparing the performance in terms of sound quality between the abovementioned conventional radially magnetized speaker unit 61 and the externally magnetized
speaker unit 41, the speaker unit 61 Thus, it has been found that the output sound pressure level
is low despite the use of a magnet having a larger maximum energy than the speaker unit 41.
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That is, in the speaker unit 61, the magnetic energy of the magnet is not sufficiently used
effectively.
[0013]
That is, the conventional radially magnetized speaker unit is excellent in terms of reducing the
overall weight of the unit, but has the problem that the performance improvement in terms of
output sound pressure level is not sufficient with respect to the performance of the magnet.
doing. In addition, in order to improve the output sound pressure level, there is only a means
such as using an expensive magnet having a higher magnetic flux density, for example, which has
led to a rise in the product price.
[0014]
The present invention has been made in view of the above problems, and it is an object of the
present invention to provide a speaker unit whose performance in terms of sound quality is
improved while suppressing an increase in weight and manufacturing cost of the entire unit as
much as possible. There is.
[0015]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the speaker
unit according to claim 1 of the present invention comprises a radially magnetized annular
magnet and a diameter slightly larger than the outer diameter of the magnet. A cylindrical first
coil bobbin having an inner diameter and fitted to the outer periphery of the magnet, and an
outer diameter slightly smaller than the inner diameter of the magnet, and a cylindrical first
fitted to the inner periphery of the magnet It is characterized by comprising two coil bobbins,
and first and second voice coils wound around side surfaces of the first and second coil bobbins.
[0016]
According to a second aspect of the present invention, there is provided the speaker unit
according to the first aspect, wherein the main vibration plate coupled to the first coil bobbin, the
sub-vibration coupling the first coil bobbin and the second coil bobbin to each other. It is
characterized by further comprising a plate.
[0017]
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According to a third aspect of the present invention, there is provided the speaker unit according
to the first aspect, further comprising a single diaphragm in which the first coil bobbin and the
second coil bobbin are connected.
[0018]
According to the first aspect of the present invention, the magnetic flux generated in the vicinity
of the outer periphery of the radially magnetized annular magnet penetrates the first voice coil
wound around the side surface of the first coil bobbin. Driving force is generated in the first voice
coil, and the magnetic flux generated near the inner periphery of the magnet penetrates the
second voice coil wound around the side surface of the second coil bobbin. The driving force is
generated in the voice coil of
[0019]
As a result, it is possible to obtain not only the magnetic flux generated at the outer periphery of
the magnet but also the driving force by the magnetic flux generated at the inner periphery, as
compared to the case where cylindrical magnets having the same maximum energy value are
used. Therefore, the magnetic energy of the magnet is effectively converted to the driving force
of the voice coil.
As a result, the output sound pressure level can be improved without, for example, increasing the
amount of magnets used or using expensive magnets having a higher magnetic flux density,
thereby increasing the weight and manufacturing cost of the unit. It is possible to provide a
speaker unit excellent in sound quality performance.
[0020]
According to the second aspect of the present invention, the vibration of the second coil bobbin
due to the driving force generated in the second voice coil is transmitted to the auxiliary
diaphragm, and transmitted to the first coil bobbin via the auxiliary diaphragm. The main
diaphragm can be vibrated by the received vibration and the vibration transmitted to the first coil
bobbin by the driving force generated in the first voice coil, whereby the energy of the magnet is
effectively used to generate the sound pressure. You can improve the level.
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As a result, it is possible to provide a speaker unit excellent in sound quality performance without
increasing the weight and manufacturing cost of the unit.
[0021]
According to the configuration of the third aspect, it is sufficient to provide only one diaphragm
vibrating in conjunction with the first coil bobbin and the second coil bobbin, so that the
vibration system is compared to the configuration described in the second embodiment. Since the
number of parts is reduced and the weight is reduced, the output sound pressure level can be
further improved, and the weight reduction and cost reduction of the entire unit can be achieved.
As a result, it is possible to provide a speaker unit excellent in sound quality performance and
reduced in weight while reducing the manufacturing cost.
[0022]
Embodiment 1 One embodiment of the present invention will be described below with reference
to FIGS. 1 and 4.
As shown in FIG. 1, the speaker unit 11 according to the present embodiment includes a
magnetic circuit unit 8 configured of an annular magnet 6 and a support plate 7.
The support plate 7 has an annular support portion 17 projecting upward from the bottom
center portion, and the magnet 6 is installed and fixed on the upper surface of the support
portion 17. A frame 9 is mounted and fixed on the upper portion of the support plate 7.
[0023]
The above-mentioned magnet 6 is a so-called radially magnetized permanent magnet having
different magnetic poles at the inner and outer peripheral portions of the ring. That is, assuming
that the inner peripheral side of the ring is the S pole, the magnet 6 has magnetic polarity such
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that the outer peripheral side is the N pole. Alternatively, the opposite polarity may be used. The
magnet 6 has an outer diameter of 30 mm, an inner diameter of 20 mm, and a thickness of 8
mm, and its mass is 23.6 g. That is, the magnets used in the conventional radially magnetized
speaker unit 61 shown in FIG. 6 and the speaker unit 11 of this embodiment have the same mass,
and the maximum energy as a single magnet is also the same.
[0024]
Further, the speaker unit 11 has a cylindrical first coil bobbin 3 having an inner diameter slightly
larger than the outer diameter of the annular magnet 6 and a cylindrical first coil bobbin 3
having an outer diameter slightly smaller than the inner diameter of the magnet 6. A two-coil
bobbin 4 is provided, the first coil bobbin 3 is disposed to be fitted to the outside of the magnet
6, and the second coil bobbin 4 is fitted to the inside of the first coil bobbin 3 at the inner
periphery of the magnet 6 It is arranged in the state. The first and second coil bobbins 3 and 4
are movable so that the first and second coil bobbins 3 and 4 can freely move in the vertical
direction with respect to the magnet 6 and shake in the lateral direction does not occur. The
outer diameter and the inner diameter of each are appropriately formed.
[0025]
A lead wire is wound around the outer periphery of the side surface lower part of the 1st coil
bobbin 3, and the 1st voice coil 1 is formed. Further, a lead wire is wound along the inner
circumference inside the lower portion of the side surface of the second coil bobbin 4 to form the
second voice coil 2.
[0026]
Further, one end of a damper 10 is joined to a side surface intermediate portion of the first coil
bobbin 3, and the other end of the damper 10 is fixed to the frame 9. Furthermore, the first
vibration is connected to the first coil bobbin 3 and the second coil bobbin 4 by the subdiaphragm 14, and the main vibration is formed on the outer periphery of the upper side surface
of the first coil bobbin 3 so that the inner diameter gradually expands upward. The lower
peripheral edge of the plate 16 is joined. The upper peripheral edge of the main diaphragm 16 is
connected to the peripheral edge of the frame 9 by an annular edge 12 and a gasket 13.
Furthermore, on the upper part of the second coil bobbin 4, a dustproof cap 15 for covering the
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dust and the like is covered.
[0027]
In the above configuration, by radially magnetizing the magnet 6 and forming it in an annular
shape, as shown by the dotted line in the figure, the magnetic circuit portion 8 is near the outer
peripheral portion and the inner peripheral portion of the magnet 6. And a magnetic circuit is
formed. That is, while the first voice coil 1 is penetrated by the magnetic flux generated in the
vicinity of the outer peripheral portion of the magnet 6 to obtain a driving force by
electromagnetic induction, the second voice coil 2 is driven by the magnetic flux generated in the
vicinity of the inner peripheral portion Ru. The vibration of the first and second voice coils 1 and
2 is converted to an acoustic output by being transmitted to the main diaphragm 16 and the sub
diaphragm 14 via the first and second coil bobbins 3 and 4.
[0028]
Here, FIG. 4 shows a graph representing the characteristics of the output sound pressure level
obtained by the above-described configuration in comparison with the conventional
configuration. In the figure, a graph A indicated by an alternate long and short dash line
represents characteristics of the output sound pressure level in the above-described conventional
radial magnetized speaker unit, and a graph B indicated by a dotted line has the configuration of
the present embodiment. Represents the characteristics of the output sound pressure level. The
graph C indicated by a solid line will be described in another embodiment described later.
[0029]
For comparison, as described above, a magnet having the same maximum energy as that of the
conventional radially magnetized speaker unit was used as the magnet 6. As apparent from the
comparison of the graphs A and B in the same figure, according to the configuration of the
present embodiment, the output sound pressure level can be improved as compared with the
conventional configuration.
[0030]
As described above, according to the configuration of the present embodiment, in order to utilize
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both of the magnetic flux generated respectively in the vicinity of the outer peripheral portion
and in the vicinity of the inner peripheral portion of the radially magnetized annular magnet 6.
By providing a voice coil on both the outer periphery and the inner periphery of the magnet 6
and transmitting the driving force generated in the voice coil to the diaphragm, the magnetic
energy of the magnet 6 can be effectively used, and an excellent output is obtained. Sound
pressure level can be obtained.
[0031]
In addition, although the number of parts such as coil bobbins and coils is slightly increased as
compared with the conventional radially magnetized speaker unit, the weight of these units is
extremely small with respect to the weight of the entire unit. It is effective in the ability to
improve the performance in terms of sound quality while suppressing the increase in the overall
weight.
[0032]
[Embodiment 2] Another embodiment of the present invention will be described below with
reference to FIGS. 2 to 4.
In addition, the same member numbers are given to each member which has the same function
as the said Example 1, and those description is abbreviate ¦ omitted.
[0033]
The speaker unit according to the present embodiment differs from the configuration described
in the first embodiment in the configuration of the diaphragm and the connection portion
between the diaphragm and the first and second coil bobbins 3 and 4.
As shown in FIG. 2, the speaker unit 21 according to this embodiment includes only one
diaphragm 22, and the lower peripheral portion of the diaphragm 22 is joined to the outer
periphery of the upper side of the second coil bobbin 4. At the same time, the upper end portion
of the first coil bobbin 3 is joined to the back surface of the diaphragm 22 above the joint portion
between the diaphragm 22 and the second coil bobbin 4.
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[0034]
That is, both of the vibrations generated in the first voice coil 1 and the second voice coil 2 by
the driving force obtained by both of the magnetic flux generated in the vicinity of the outer
peripheral portion and in the vicinity of the inner peripheral portion of the magnet 6 It is
supposed to be transmitted directly. Further, since the total mass of vibration system components
such as the diaphragm can be reduced, the output sound pressure level can be improved, and the
performance in terms of sound quality can be further improved.
[0035]
A graph C indicated by a solid line in FIG. 4 represents the characteristics of the output sound
pressure level obtained by the configuration of the present embodiment. As described above, the
graph A shows the characteristics of the conventional radially magnetized speaker unit, and the
graph B shows the characteristics of the output sound pressure level of the configuration
described in the first embodiment. According to the configuration of the present embodiment, the
output sound pressure level can be further improved.
[0036]
As described above, according to the configuration of the present embodiment, it is possible to
obtain more excellent characteristics at the output sound pressure level, and it is also possible to
use one diaphragm as compared with the configuration of the first embodiment. Therefore, since
the number of parts can be reduced, the manufacturing cost can be reduced. As a result, it is
possible to provide a radially magnetized speaker unit with improved performance in sound
quality.
[0037]
The present invention is not limited to the above-described configuration, and various
modifications can be made within the scope of the invention. For example, as shown in FIG. 3, the
second voice coil 2 may be formed outside the second coil bobbin 4, and the second voice coil 2
as described above may be formed on the inner side of the second coil bobbin 4. The same effect
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as the configuration formed in
[0038]
As described above, the speaker unit according to claim 1 of the present invention has a radially
magnetized annular magnet, and an inner diameter slightly larger than the outer diameter of the
magnet. A cylindrical first coil bobbin fitted to the outer periphery, a cylindrical second coil
bobbin having an outer diameter slightly smaller than the inner diameter of the magnet, and
fitted to the inner periphery of the magnet; And the first and second voice coils wound around
the respective side surfaces of the second coil bobbin.
[0039]
As a result, it is possible to obtain not only the magnetic flux generated in the outer peripheral
portion of the magnet but also the driving force by the magnetic flux generated in the inner
peripheral portion. You can get it.
As a result, it is possible to provide a speaker unit excellent in sound quality performance without
increasing the manufacturing cost.
[0040]
The speaker unit according to claim 2 further includes a main diaphragm coupled to the first coil
bobbin, and an auxiliary diaphragm coupling the first coil bobbin and the second coil bobbin to
each other. As a result, it is possible to effectively use the magnetic energy of the magnet to
provide a speaker unit excellent in the performance of the sound quality.
[0041]
A speaker unit according to a third aspect of the present invention is configured to include a
single diaphragm in which a first coil bobbin and a second coil bobbin are connected. As a result,
the output sound pressure level can be further improved by reducing the number of parts of the
vibration system and reducing the weight, and as a result, while reducing the manufacturing cost,
the sound quality is excellent and lightweight. The speaker unit can be provided.
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[0042]
Brief description of the drawings
[0043]
1 is a cross-sectional view schematically showing a configuration of a speaker unit according to
an embodiment of the present invention.
[0044]
2 is a cross-sectional view schematically showing a configuration of a speaker unit according to
another embodiment of the present invention.
[0045]
<Figure 3> It is the cross section diagram which shows the constitution of the speaker unit which
relates to the other example of this invention roughly.
[0046]
4 is a graph for comparing the characteristics of the output sound pressure level of the speaker
unit of the present invention with the characteristics of the conventional speaker unit.
[0047]
5 is a cross-sectional view schematically showing a configuration of a conventional external
magnet type speaker unit.
[0048]
6 is a cross-sectional view schematically showing the configuration of a conventional radial
magnetized speaker unit.
[0049]
Explanation of sign
[0050]
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1 first voice coil (first voice coil) 2 second voice coil (second voice coil) 3 first coil bobbin (first
coil bobbin) 4 second coil bobbin (second coil bobbin) 6 magnet (magnet) 14 Sub diaphragm 16
Main diaphragm
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