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DESCRIPTION JPWO2016093227

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DESCRIPTION JPWO2016093227
Abstract: To provide a speaker device that is reduced in thickness and cost. A first speaker unit
(10) having a first diaphragm (1) connected to a voice coil bobbin (3), and a second diaphragm
(5) installed inside the voice coil bobbin (3) And a second speaker unit (20). When the sound
radiation direction P of the first speaker unit (10) and the second speaker unit (20) is upward
and the direction opposite to the sound radiation direction P is downward, the upper end of the
first diaphragm (1) The position of A is made approximately equal to the upper end B of the
second diaphragm (5).
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
For example, a small and thin speaker device installed on the ceiling surface of a car generally
covers the full range in 1 WAY.
As such a speaker device, there is, for example, one disclosed in WO 2005/015950 (Patent
Document 1). In this conventional speaker device, the rigidity of the diaphragm is enhanced by
providing a folded diaphragm, and covers up to high frequencies.
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1
[0003]
WO 2005/015950
[0004]
In the conventional speaker device as described in Patent Document 1, it is necessary to adopt a
magnetic circuit which forms a strong magnetic field using a small magnet in order to secure a
space of the diaphragm having a fold.
In order to obtain a strong magnetic field with such a small magnet, it is necessary to employ a
magnet of strong magnetic force such as a neodymium magnet. However, neodymium magnets
are expensive and cause a significant cost increase.
[0005]
Further, in the speaker device of Patent Document 1, when considering the thickness in the
vertical direction when the sound radiation direction is up and the opposite side is down, there
are the following problems. That is, the length from the upper end, which is the outer periphery
and the central portion of the diaphragm, to the lower end, which is the bent portion of the
folded-back portion, increases.
[0006]
Therefore, as a problem to be solved by the present invention, it is mentioned as an example to
provide a speaker device which realizes the thinning and the cost reduction while being the 2
WAY type.
[0007]
The speaker device according to claim 1 comprises a first speaker unit having a first diaphragm
connected to a voice coil bobbin, and a second speaker unit having a second diaphragm installed
inside the voice coil bobbin. And the height of the upper end of the first diaphragm is
substantially equal to the height of the upper end of the second diaphragm.
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[0008]
It is a longitudinal cross-sectional view of the speaker apparatus of the Example of this invention,
and the modification 1. FIG.
It is a surface top view of the speaker apparatus of an Example.
It is a surface perspective view of the speaker apparatus of an Example. It is a back surface top
view in the state where the frame of the speaker apparatus of an example was removed. It is a
back surface top view of the speaker apparatus of the modification 1 of the Example of this
invention. It is a longitudinal cross-sectional view of the speaker apparatus of the modification 2
of the Example of this invention. It is a figure which shows an example of the direction of the
magnetic pole of the magnet in the Example of this invention, and the flow of magnetic flux.
[0009]
Hereinafter, an embodiment of the present invention will be described. A speaker device
according to an embodiment of the present invention includes a first speaker unit having a first
diaphragm connected to a voice coil bobbin, and a second diaphragm installed inside the voice
coil bobbin. And a second speaker unit whose sound radiation direction is substantially the same
as the first speaker unit. When the sound radiation direction is upward and the opposite
direction is downward, the height of the upper end of the first diaphragm is substantially equal to
the height of the upper end of the second diaphragm.
[0010]
It is preferable that the height of the lower end of the first diaphragm be approximately equal to
the height of the lower end of the second diaphragm.
[0011]
It is preferable that the length from the upper end to the lower end of the first diaphragm be
substantially equal to the length from the upper end to the lower end of the second diaphragm.
[0012]
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The second speaker unit preferably includes a magnetic circuit including a magnet, and the
magnet is disposed between the upper end and the lower end of the voice coil bobbin.
[0013]
The first diaphragm is provided at its inner peripheral side with a flat portion having a plane
perpendicular to the sound radiation direction, and this flat portion is preferably substantially
equal to the height of the upper end of the second diaphragm.
[0014]
The first diaphragm is provided with a folded back portion that is convex on the outer peripheral
side in the direction opposite to the sound radiation direction, and the height of the lower end of
the folded back portion is substantially equal to the height of the lower end of the second
diaphragm Is preferred.
[0015]
In this case, the first speaker unit includes a magnetic circuit including a magnet, and the lower
end of the folded portion of the first diaphragm is located above the upper end of the magnet of
the first speaker unit. Is preferred.
[0016]
Furthermore, the second diaphragm is provided with a folded back portion formed to be convex
on the side opposite to the sound radiation direction, and the folded back portion of the first
diaphragm and the folded back portion of the second diaphragm Preferably, the heights of the
lower ends of the respective members are substantially equal.
[0017]
When the first diaphragm vibrates in the sound radiation direction, the height of the upper end
of the first diaphragm becomes higher than the height of the upper end of the second diaphragm,
and the first diaphragm is It is preferable that the height of the upper end of the first diaphragm
be lower than the height of the upper end of the second diaphragm when vibrating in the
opposite direction to the sound radiation direction.
[0018]
The magnet of the first speaker unit is preferably a ferrite magnet.
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[0019]
The thickness in the vertical direction of the magnet of the first speaker unit is preferably larger
than the length from the upper end to the lower end of the first diaphragm.
[0020]
The ratio TW / φ of the length TW from the upper end of the first diaphragm to the lower end of
the magnetic circuit of the first speaker unit to the outer diameter φ of the first speaker unit is
0.1 ≦ TW / φ ≦ It is preferable that it is 0.2.
[0021]
The inner peripheral end of the external magnet type magnetic circuit of the first speaker unit is
preferably connected to the outer peripheral end of the second speaker unit.
[0022]
In this case, the cylindrical portion of the yoke of the external magnetic type magnetic circuit
forms the inner peripheral end, and the frame of the second speaker unit is the outer peripheral
end of the external magnetic type magnetic circuit. Preferably, the cylindrical portion is
connected to the outer peripheral end of the second speaker unit.
[0023]
The external magnet type magnetic circuit of the first speaker unit includes a plate, a yoke, and
an outer magnet disposed between the plate and the yoke, and the internal magnet type of the
second speaker unit The magnetic circuit includes a plate, a yoke, and an inner magnet disposed
between the plate and the yoke, and a part of the outer magnetic magnetic circuit and the inner
magnetic type in the sound radiation direction. It is preferable that a part of the magnetic circuit
is at the same height, the magnetic poles of the outer magnet and the inner magnet on the plate
side are the same, and the magnetic poles of the outer magnet and the inner magnet on the yoke
side are the same. .
[0024]
The external magnet type magnetic circuit of the first speaker unit includes a plate, a yoke, and
an outer magnet disposed between the plate and the yoke, and the internal magnet type of the
second speaker unit The magnetic circuit includes a plate, a yoke, and an inner magnet disposed
between the plate and the yoke, and a bottom portion of the inner magnetic type magnetic circuit
is a bottom portion of the outer magnetic type magnetic circuit. It is preferable that the terminal
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portion be disposed in a space which is disposed closer to the sound radiation side and which is
surrounded by the bottom portion of the inner magnet type magnetic circuit and the outer
magnet type magnetic circuit.
[0025]
FIG. 1 is a longitudinal sectional view of a speaker apparatus according to an embodiment and a
first modification of the present invention, FIG. 2 is a surface plan view of the speaker apparatus
according to the embodiment, FIG. 3 is a surface perspective view of the speaker apparatus
according to the embodiment, and FIG. It is a back plane view in the state where the frame of the
example speaker device was removed.
The concept of “upper and lower” in the following description corresponds to upper and lower
in the drawing of FIG. 1.
[0026]
The speaker device according to the present embodiment includes a first speaker unit 10 and a
second speaker unit 20 coaxially arranged with the axis L as a central axis.
In the speaker device according to the embodiment, the first speaker unit 10 functions as a lowrange to mid-range speaker, and the second speaker unit 20 functions as a high-range tweeter.
Further, the sound radiation direction of the first speaker unit 10 and the second speaker unit 20
is the direction of the arrow P shown in FIG.
The speaker device of this embodiment is a thin speaker device attached to a ceiling or the like in
a car.
[0027]
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The first speaker unit 10 includes a diaphragm 1, a magnetic circuit 2, a voice coil bobbin 3, and
a frame 4.
The diaphragm 1 has a slightly flat elliptical shape with the axis L as a central axis, and the outer
peripheral end is supported by the frame 4 via the edge portion 1a.
The diaphragm 1 is formed of, for example, paper, resin, or a metal material, and the diaphragm
1 is formed with a folded portion 11 bent in a V-shaped cross section inside in the radial
direction of the edge portion 1a.
In addition, a flat portion 12 having a planar shape is formed from the inner peripheral side of
the folded portion 11 toward the center.
Furthermore, in the diaphragm 1, a circular opening 13 centered on the axis L is formed on the
radially inner side of the flat portion 12.
[0028]
The magnetic circuit 2 of the first speaker unit 10 has a magnet 21, a plate 22 and a yoke 23.
The magnet 21 has an annular shape and is a ferrite permanent magnet.
The magnet 21 may be, for example, a permanent magnet of samarium-cobalt type, alnico type
or the like.
The plate 22 and the yoke 23 are formed of magnetic metal such as iron, and the plate 22 has an
annular shape.
The yoke 23 is integrally formed with an annular flange portion (bottom) 23a having
substantially the same diameter as the plate 22, and a cylindrical tubular portion 23b erected
from the inner periphery of the flange portion 23a.
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The annular magnet 21 and the plate 22 are disposed on the outer periphery of the cylindrical
portion 23b of the yoke 23 with a predetermined distance from the cylindrical portion 23b, and
the flange portion 23a, the magnet 21 and the plate 22 are stacked.
Thus, the magnetic gap 2G is formed between the inner peripheral end of the plate 22 and the
upper end of the cylindrical portion 23b of the yoke 23.
[0029]
The voice coil bobbin 3 has a cylindrical shape, and is fixed to the inner peripheral edge of the
circular opening 13 of the diaphragm 1.
Thus, the voice coil bobbin 3 supports the diaphragm 1. Further, a voice coil 31 is wound around
the lower periphery of the voice coil bobbin 3. In addition, the lead-out wire 32 which supplies
an audio | voice signal to the voice coil 31 is attached to the return part 11. As shown in FIG. The
voice coil 31 (and the voice coil bobbin 3) is disposed in the magnetic gap 2G of the magnetic
circuit 2. Then, when an audio signal is input to the voice coil 31, the voice coil 31 and the voice
coil bobbin 3 vibrate along the direction of the axis L to vibrate the diaphragm 1. Thereby, the
sound radiation direction P of the first speaker unit 10 is an upward direction parallel to the axis
L.
[0030]
The second speaker unit 20 includes a diaphragm 5, a magnetic circuit 6, and a frame 7. The
diaphragm 5 is made of a metal material, and has a rotationally symmetrical shape with the axis
L as the axis of rotation. The diaphragm 5 has a dome-shaped vibrating portion 51, a voice coil
bobbin 52, a cone-shaped vibrating portion 53, and an outer peripheral end portion 54. The
dome-shaped vibrating portion 51, the voice coil bobbin 52, the cone-shaped vibrating portion
53, and The outer peripheral end 54 is integrally formed. The diaphragm 5 is supported by the
frame 7 at the outer peripheral end 54.
[0031]
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The dome-shaped vibrating portion 51 is formed in a convex shape at the central portion of the
diaphragm 5, and the top of the central portion of the dome-shaped vibrating portion 51 is
formed higher than the outer peripheral end portion 54. This shape makes it possible to obtain
wide-angle directional characteristics. In addition, the dome-shaped vibration unit 51 is
vibratably supported along the axis L direction (drive direction) at a prescribed position on the
magnetic circuit 6 by the voice coil bobbin 52, the cone-shaped vibration unit 53, and the outer
peripheral end 54. .
[0032]
The magnetic circuit 6 of the second speaker unit 20 has a magnet 61, a plate 62 and a yoke 63.
The magnet 61 has a disk shape, and is, for example, a ferrite permanent magnet. The magnet 61
may be, for example, a permanent magnet of samarium cobalt type, alnico type, neodymium type
or the like. The plate 62 and the yoke 63 are formed of magnetic metal such as iron, and the
plate 62 has a disk shape having a diameter slightly larger than that of the magnet 61. The yoke
63 is formed by integrally forming a disk-shaped disk portion (bottom) 63a having a diameter
larger than that of the magnet 61 and a curved portion 63b curved from the disk portion 63a to
the plate 62 side. Then, the magnet 61 is sandwiched between the disc portion 63a and the plate
62, and the yoke 63, the magnet 61 and the plate 62 are stacked. Thus, a magnetic gap 6G is
formed between the outer peripheral end of the plate 22 and the inner peripheral surface of the
curved portion 63b of the yoke 63.
[0033]
The voice coil bobbin 52 of the diaphragm 5 has a cylindrical shape, and the voice coil 52 a is
wound around the outer periphery of the voice coil bobbin 52. The voice coil 52 a (and the voice
coil bobbin 52) is disposed in the magnetic gap 6 G of the magnetic circuit 6. Then, when an
audio signal is input to the voice coil 52, the voice coil 52a and the voice coil bobbin 52 vibrate
along the direction of the axis L to vibrate the diaphragm 5. Thereby, the sound radiation
direction P of the second speaker unit 20 is an upward direction parallel to the axis L. The voice
coil 52a may be fixed to the voice coil bobbin 52 of the diaphragm with an adhesive or the like.
[0034]
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In the figure, “A” is the upper end of the diaphragm 1, “B” is the upper end of the
diaphragm 5, “C” is the lower end of the diaphragm 1, “D” is the lower end of the
diaphragm 5, and “E” is the magnet 21. It is the top. The upper end and the lower end appear
as lines in FIGS. 2 to 4, but the upper end A, the upper end B, the lower end C, and the lower end
D are arbitrary points on this line.
[0035]
The speaker device according to the embodiment includes a first speaker unit 10 having a
diaphragm 1 having an opening 13 and an external magnetic type magnetic circuit 2, and a
second speaker unit 20 installed radially inside the opening 13. And have. Then, on the outer
peripheral side of the diaphragm 1 of the first speaker unit 10, a folded portion 11 which is
convex on the opposite side to the sound radiation direction P is formed. Since the folded back
portion 11 has a shape (a V-shaped cross section) convex on the side opposite to the sound
radiation direction P, the second moment of area on the plane including the axis L is large, and
the rigidity can be secured.
[0036]
Further, as shown in FIG. 1, the outer diameter of the flat portion 12 of the diaphragm 1 is
smaller than the outer diameter of the magnet 21 of the magnetic circuit 2. Furthermore, the flat
portion 12 has a plane perpendicular to the sound radiation direction P of the first speaker unit
10. Therefore, the thickness in the sound radiation direction of the diaphragm 1 can be reduced,
and the thickness of the first speaker unit 10 itself can be reduced. Furthermore, since the folded
back portion 11 on the outer side of the flat portion 12 is convex further to the side opposite to
the sound radiation direction P outside the outer diameter of the magnet 21, the internal space
under the flat portion 12 is wide It is possible to adopt an external magnet type for the magnetic
circuit 2 and a ferrite magnet having a relatively large volume as the magnet 21 can be adopted.
Therefore, the cost can be reduced while obtaining a sufficient driving force.
[0037]
Further, the second speaker unit 2 is located radially inward of the voice coil bobbin 3 of the first
speaker unit 10. Therefore, the thickness of the speaker device can be reduced. In addition, the
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first speaker unit 10 is provided with a plate 22 magnetically coupled to the pole of the magnet
21, and the outer diameter of the plate 22 is smaller than the outer diameter of the flat portion
12 of the diaphragm 1. There is. Further, the outer diameter of the plate 22 is smaller than the
outer diameter of the magnet 21. Therefore, the thickness in the sound radiation direction of the
diaphragm 1 can be reduced, and the thickness of the first speaker unit 10 itself can be reduced.
[0038]
The magnet 21 of the magnetic circuit 2 of the first speaker unit 10 has an annular shape, and
the magnet 61 of the magnetic circuit 6 of the second speaker unit 20 has a circular shape. And
these magnets 21 and 61 are arrange | positioned coaxially.
[0039]
In the speaker device according to the embodiment, the first speaker unit 10 having the first
diaphragm 1 connected to the voice coil bobbin 3 and the second diaphragm 5 installed inside
the voice coil bobbin 3 in the radial direction , And the second speaker unit 20 whose sound
radiation direction P substantially matches the first speaker unit 10. When the sound radiation
direction P is upward and the opposite direction is downward, the position of the upper end A of
the first diaphragm 1 is at the upper end B of the second diaphragm 5 as shown in FIG. It is
almost equal to the position. Accordingly, the phases of the sound wave emitted from the first
diaphragm 1 and the wave of the sound wave emitted from the second diaphragm 5 are aligned,
and good acoustic characteristics can be obtained.
[0040]
Further, as shown in FIG. 1, the position of the lower end C of the first diaphragm 1 of the first
speaker unit 10 is substantially equal to the position of the lower end D of the second diaphragm
5 of the second speaker unit 20. It has become. Further, the length from the upper end A to the
lower end C of the first diaphragm 1 is substantially equal to the length from the upper end B to
the lower end D of the second diaphragm 5. Therefore, the thickness of the speaker device can be
reduced.
[0041]
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In addition, the second speaker unit 20 includes the magnetic circuit 6 including the magnet 61,
and the magnet 61 is disposed between the upper end and the lower end of the voice coil bobbin
3 of the first speaker unit 10. Therefore, the thickness of the speaker device can be reduced.
[0042]
The first diaphragm 1 of the first speaker unit 10 is provided at its inner peripheral side with a
flat portion 12 having a flat surface perpendicular to the sound radiation direction P, and this flat
portion 12 corresponds to the second flat surface of the second speaker unit 20. The position of
the upper end B of the second diaphragm 5 is substantially equal.
[0043]
In addition, the first diaphragm 1 is provided with a folded portion 11 that is convex on the outer
peripheral side opposite to the sound radiation direction P, and the position of the lower end C of
the folded portion 11 is the second diaphragm 5. And the position of the lower end D of the
[0044]
Furthermore, the first speaker unit 10 includes the magnetic circuit 2 including the magnet 21,
and the lower end C of the folded portion 11 of the first diaphragm 1 is above the upper end E of
the magnet 21 of the first speaker unit 10. It is supposed to be located.
[0045]
Further, the second diaphragm 5 is provided with a folded portion 5 a formed to be convex on
the opposite side to the sound radiation direction P by the voice coil bobbin 52 and the coneshaped vibrating portion 53.
The positions of the lower ends C and D of the folded back portion 11 of the first diaphragm 1
and the folded back portion 5 a of the second diaphragm 5 are substantially equal.
[0046]
Further, when the first diaphragm 1 vibrates to the sound radiation side (the sound radiation
direction P side), the position of the upper end A of the first diaphragm 1 is higher than the
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position of the upper end B of the second diaphragm 5. When the first diaphragm 1 vibrates to
the side opposite to the sound radiation side (opposite to the sound radiation direction P), the
position of the upper end A of the first diaphragm 1 becomes the upper end of the second
diaphragm 5 It is below the position of B.
[0047]
Further, as shown in FIG. 1, the thickness in the vertical direction of the magnet 21 of the
magnetic circuit 2 of the first speaker unit 10 is larger than the length from the upper end A to
the lower end C of the first diaphragm 1 .
That is, the magnet 21 having a large volume is used for the thin diaphragm 1.
[0048]
Although the example in which the diaphragm 1 of the first speaker unit 10 is elliptical has been
described in the above embodiments, the shape of the diaphragm may be circular (perfect circle)
as in the first modification of FIG. 5.
In the following modifications 1 and 2, the same elements as those in the above embodiment are
indicated by the same reference numerals.
Moreover, since the structure of the same element and the effect are the same as that of the
embodiment, the redundant description will be omitted.
[0049]
The speaker unit 30 in the first modification shown in FIG. 5 has a circular diaphragm 1x. The
longitudinal cross-sectional view of the speaker device of this modification 1 is the same as that
of FIG. The diaphragm 1x is made of, for example, paper, resin, metal material or the like, and the
diaphragm 1x is formed with a folded portion 11x bent in a V-shaped cross section inside in the
radial direction of the edge portion 1xa. In addition, a flat portion 12x having a planar shape is
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formed from the inner peripheral side of the folded portion 11x toward the center. In addition,
the said opening 13 similar to an Example is formed in the radial inside of the flat part 12x. And
edge part 1xa, folding part 11x and its lower end C, and flat part 12x are all the shape of a
perfect circle. The magnetic circuit 2 and the voice coil bobbin 3 are the same as in the
embodiment. Further, in the first modification, the circle formed by the lower end C of the folded
portion 11 x has a diameter larger than that of the magnet 21 of the magnetic circuit 2.
[0050]
Thus, since the magnet 21 of the magnetic circuit 2 of the first speaker unit 30 is disposed
radially inward of the lower end C of the folded portion 11x of the diaphragm 1x, interference
between the magnet 21 and the folded portion 11x Therefore, the thickness of the speaker
device can be reduced.
[0051]
The diaphragm 1x of the first speaker unit 30 and the diaphragm 5 of the second speaker unit
20 are both circular and coaxial.
[0052]
In the above embodiment and modification 1, the frame 7 of the second speaker unit 20 is
engaged with the end of the cylindrical portion 23b of the yoke 23 of the magnetic circuit 2 of
the first speaker unit 10, but The relationship between the speaker unit 2 and the yoke 23 of the
magnetic circuit 2 may be as shown in the second modification of FIG.
[0053]
In the second modification shown in FIG. 6, the second speaker unit 40 includes the magnetic
circuit 6 similar to that of the previous embodiment, and the diaphragm 5 y having a diameter
smaller than that of the diaphragm 5 and the diameter larger than that of the frame 7. It has a
small frame 7y.
The diaphragm 5y has a dome-shaped vibrating portion 51, a voice coil bobbin 52, and a coneshaped vibrating portion 53, and has an outer peripheral end 54y smaller in diameter than the
outer peripheral end 54 of the embodiment.
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The diaphragm 5y is supported by the frame 7y by the outer peripheral end 54y.
Therefore, the outer diameter of the second speaker unit 40 of this modification 2 is smaller than
that of the second speaker unit 20 of the embodiment, and the second speaker unit 40 is the
yoke 23 of the first speaker unit 10. Is fitted in the cylindrical portion 23a. As described above, in
the second modification, the magnetic circuit 2 in the first speaker unit 10 includes the yoke 23
magnetically coupled to the magnet 21, and the second speaker unit 40 is the first speaker unit
10. Are located radially inward of the inner periphery of the yoke 23 of
[0054]
Further, as shown in FIG. 1 and FIG. 6, in the speaker device of the embodiment and the first and
second modifications, the upper end A of the diaphragm 1 of the first speaker unit 10 to the
magnetic circuit 2 of the first speaker unit 10. The length TW to the lower end (the lower end of
the yoke 23) is about 10 mm. Further, the outer diameter φ of the first speaker unit 10 is about
80 mm. Thus, the ratio TW / φ of the length TW to the outer diameter φ is 0.1 ≦ TW / φ ≦
0.2.
[0055]
In the above-described embodiment and the first and second modifications, the diaphragms 1
and 1x and the diaphragms 5 and 5y are formed of, for example, paper, resin, or a metal
material. Or titanium, duralumin, beryllium, magnesium alloy, etc. can be employed.
[0056]
As described above, in the embodiment and the first modification, the inner peripheral end of the
external magnet type magnetic circuit 2 of the first speaker unit 10 is connected to the outer
peripheral end of the second speaker unit 20.
That is, the cylindrical portion 23 b of the yoke 23 of the external magnet type magnetic circuit 2
of the first speaker unit 10 forms the inner peripheral end of the external magnet type magnetic
circuit 2, and the second speaker unit 20 The outer peripheral end 7 a of the frame 7 which the
second embodiment has has an outer peripheral end of the second speaker unit 20. The
cylindrical portion 23 b is connected to the outer peripheral end 7 a of the frame 7 of the second
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speaker unit 20. As a result, a fading plug or the like conventionally used in so-called coaxial
speakers is not necessary, and weight reduction can be achieved.
[0057]
In the embodiment, the first modification and the second modification, the external magnet type
magnetic circuit 2 of the first speaker unit 10 is disposed between the plate 22, the yoke 23, and
the plate 22 and the yoke 23. And a magnet 21 (outer magnet). The magnetic circuit 6 of the
second speaker unit 20 (40) includes a plate 62, a yoke 63, and a magnet 61 (inner magnet)
disposed between the plate 62 and the yoke 63. The magnetic circuit 6 constitutes an internal
magnet type magnetic circuit. And, in the sound radiation direction P, a part of the external
magnetic circuit 2 and a part of the internal magnetic circuit 6 are at the same height. That is, a
part of the plate 22 of the external magnetic type magnetic circuit 2 and a part of the cylindrical
portion 23b of the yoke 23 have the same height with a part of the magnet 61 and a part of the
yoke 63 of the internal magnetic type magnetic circuit 6 is there.
[0058]
FIG. 7 is a view showing an example of the directions of magnetic poles of the magnet 61 and the
magnet 21 and the flow of magnetic flux, and only the main reference numerals are given in the
figure. FIG. 7 shows the case of the embodiment and the first modification, but the same applies
to the second modification. In addition to the above configuration, the magnetic poles of the
magnet 61 (outer magnet) and the magnet 21 (inner magnet) on the plate 62, 22 side are the
same, and the magnet 61 (outer magnet) and magnet 21 on the yoke 63, 23 side The magnetic
poles of the (inner magnet) are the same. That is, the direction of the magnetic pole of the
magnet 61 shown by the arrow M1 in FIG. 7 is the same as the direction of the magnetic pole of
the magnet 21 shown by the arrow M2. The arrow N 1 shows an example of the flow of magnetic
flux by the magnet 61, and the arrow N 2 shows an example of the flow of magnetic flux by the
magnet 21.
[0059]
Therefore, if the directions of the magnetic poles of the outer magnet and the inner magnet are
made opposite to each other, they mutually repel each other, and it is difficult to arrange the
outer magnet type magnetic circuit and the inner magnet type magnetic circuit close to each
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16
other. According to 1 and the second modification, the outer magnetic type magnetic circuit 2
and the inner magnetic type magnetic circuit 6 can be disposed close to each other. Furthermore,
high efficiency of the magnetic circuits 2 and 6 can be achieved.
[0060]
Further, as shown in FIGS. 1 and 6, the bottom portion (bottom portion 63a of the yoke 63) of
the inner magnet type magnetic circuit 6 of the second speaker unit 20 (40) is an outer magnet
type of the first speaker unit 10. The bottom of the magnetic circuit 2 (the bottom 23a of the
yoke 23) is disposed on the sound radiation side (the sound radiation direction P side), and the
bottom of the inner magnetic type magnetic circuit 6 and the outer magnetic type magnetic
circuit 2 A terminal portion T is disposed in the enclosed space S. Thereby, the space which
arrange | positions the terminal part T can be reduced, and thickness reduction of a speaker
apparatus can be achieved.
[0061]
Although the embodiments of the present invention have been described in detail with reference
to the drawings, the specific configuration is not limited to these embodiments, and changes in
design etc. within the scope of the present invention are not limited. Are included in the present
invention. The embodiments shown in the above-mentioned drawings can be combined with each
other unless there is any contradiction or problem in the purpose, configuration and the like.
Further, the contents of the drawings may be independent embodiments, and the embodiment of
the present invention is not limited to one embodiment combining the drawings. For example, the
first speaker unit 10 and the second speaker unit may be coaxial or may have different axes. The
diaphragm or magnetic circuit is not limited to a circle or an ellipse, and may be, for example, a
polygon.
[0062]
DESCRIPTION OF SYMBOLS 10 1st speaker unit 1 diaphragm (1st diaphragm) 11 return part 12
flat part 13 opening 2 magnetic circuit 21 magnet 22 plate 23 yoke 23a flange part (bottom
part) 23b tube part 2G magnetic gap 3 voice coil bobbin 31 voice Coil 4 Frame 20 Second
speaker unit 5 Diaphragm (second diaphragm) 51 dome-shaped vibration unit 52 voice coil
bobbin 53 cone-shaped vibration unit 54 outer peripheral end 6 magnetic circuit 6 G magnetic
gap 61 magnet 62 plate 63 yoke 63 a disk Part (bottom part) 63b Curved part 7 Frame 30 First
speaker unit 1x Diaphragm 11x Folded part 12x Flat part 40 Second speaker unit 5y Diaphragm
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(second diaphragm) 7y Frame P Sound radiation direction A First Upper end B of the diaphragm
Upper end C of the second diaphragm Lower end D of the first diaphragm Upper L axis of the
lower end E magnet 2 of the diaphragm
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