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DESCRIPTION JP2000036997

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DESCRIPTION JP2000036997
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device.
[0002]
2. Description of the Related Art Conventionally, a speaker device in which a cone-type
diaphragm is supported on a magnetic circuit portion is used. The magnetic circuit portion
constituting the speaker device of this type is integrally formed with a center pole made of the
same high magnetic permeability material as the yoke at the central portion of the disk-shaped
yoke, and ring-shaped to surround the center pole. A magnet is provided. The magnet is
magnetized in the vibration direction of the diaphragm. A top plate formed in a ring shape of the
same material as the yoke is disposed on the top surface of the magnet. Then, a gap formed by
the inner peripheral end surface of the top plate and the outer peripheral surface of the center
pole is a magnetic gap. In the magnetic gap, a magnetic flux is emitted from the center pole to
the top plate to form a magnetic field. A voice coil to which a drive current corresponding to an
audio signal is supplied is inserted in the magnetic gap. The voice coil is wound on the proximal
end side of the bobbin, and a diaphragm is disposed on the distal end side of the bobbin.
[0003]
In such a speaker device, when a driving current is supplied to the voice coil, a driving force is
generated by the action of the magnetic flux in the magnetic gap and the driving current flowing
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to the voice coil to vibrate the diaphragm.
[0004]
By the way, in such a speaker device, since the diaphragm is formed in a substantially conical
shape, it is difficult to reduce the thickness of the speaker device.
Then, in order to attain thickness reduction of a speaker apparatus, there exists a speaker
apparatus which formed the diaphragm in flat form. As shown in FIG. 10, in the speaker device
100, a flat diaphragm 102 is supported by a magnetic circuit unit 101 that generates a magnetic
field. The magnetic circuit portion 101 is attached to a yoke attachment portion 105 provided in
the housing 104 with a bowl-shaped yoke 103 whose open end is on the diaphragm 102 side. A
magnet 106 is disposed at the center of the bottom of the yoke 103, and a center pole 107 is
disposed on the magnet 106. Further, the top plate 108 is attached to the upper surface side of
the yoke 103. A gap formed by the inner peripheral surface of the top plate 108 and the outer
peripheral surface of the center pole 107 is a magnetic gap 109. In the magnetic gap 109, a
magnetic field in which magnetic fluxes become radial is formed.
[0005]
The diaphragm 102 is formed in a rigid, flat plate shape, and one end thereof is supported by a
diaphragm support portion 111 provided on the housing 104. That is, one end of the diaphragm
102 is attached to the diaphragm support portion 111, and the other end is a free end not
supported by anything. The distal end side of the bobbin 112 for vibrating the diaphragm 102 is
joined to the diaphragm 102 at a position displaced on the longitudinal axis from the center. The
bobbin 112 is wound with a voice coil 113 to which a drive current according to an audio signal
is supplied on the proximal side. The bobbin 112 is disposed such that the voice coil 113 enters
the magnetic gap 109.
[0006]
In the speaker apparatus 100 as described above, when the drive current corresponding to the
audio signal is supplied to the voice coil 113, the drive is supplied to the magnetic field in the
magnetic gap 109 formed by the magnet 106 and the voice coil 113. A driving force is generated
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in a direction perpendicular to the diaphragm 102 by the action of the current. The diaphragm
102 is vibrated in the arrow Y1 direction and the arrow Y2 direction in FIG. 10 with the junction
of the diaphragm support portion 111 and the diaphragm as a fulcrum.
[0007]
In this speaker device 100, since the diaphragm 102 is vibrated with the junction of the
diaphragm support portion 111 and the diaphragm as a fulcrum, the bobbin 112 joined to the
diaphragm 102 against the center pole 107 It is driven diagonally. Therefore, the voice coil 113
wound around the bobbin 112 may collide with the opposing surface of the magnetic gap 109,
that is, the inner peripheral surface of the top plate 108 forming the magnetic gap 109 and the
outer peripheral surface of the center pole 107. is there. In this case, the speaker device 100
generates this collision sound.
[0008]
Therefore, an object of the present invention is to provide a novel speaker device which can
prevent the voice coil from colliding with the wall surface of the magnetic gap of the magnetic
circuit portion and can improve the acoustic characteristics.
[0009]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the speaker
device according to the present invention has a voice coil for driving a diaphragm, and a
magnetism having a magnetic gap in which the voice coil is inserted. And a circuit unit.
Then, the speaker device prevents the voice coil from colliding with the opposing surface of the
magnetic gap by forming the opposing surface of the magnetic gap of the magnetic circuit unit
as a curved curved surface.
[0010]
Further, in the speaker device according to the present invention, in order to solve the problems
as described above, the flat diaphragm and the diaphragm are disposed at positions displaced in
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the longitudinal direction from the center, and the diaphragm is vibrated. And a driver unit. The
driver unit includes a voice coil connected to the diaphragm, and a magnetic circuit portion
having a magnetic gap into which the voice coil is inserted, and a curved surface on which the
opposing surface of the magnetic gap bulges. In this speaker device, the driver unit supports the
diaphragm at a position displaced in the longitudinal direction from the center of the diaphragm,
and therefore, the voice coil is driven in an inclined state. At this time, in the speaker device, the
opposing surface of the magnetic gap is formed into a curved curved surface, so that the voice
coil is prevented from colliding with the opposing surface of the magnetic gap.
[0011]
Further, in the speaker device according to the present invention, in order to solve the problems
as described above, a flat diaphragm and a first driver for vibrating the diaphragm in a first
direction orthogonal to the diaphragm. And a second driver unit for vibrating the diaphragm in a
second direction orthogonal to the diaphragm. The first driver unit and the second driver unit
have a voice coil connected to the diaphragm and a magnetic gap into which the voice coil is
inserted, and the opposing surface of the magnetic gap is formed into a curved surface that
bulges out. And a magnetic circuit unit. Then, the first driver unit and the second driver unit are
disposed in parallel at a position where the diaphragm is displaced from the center to one side in
the longitudinal direction. For example, the magnets of the first driver unit and the second driver
unit are magnetized in opposite directions in the direction orthogonal to the diaphragm, and
drive currents in the same direction are supplied to the voice coils. Further, the magnets of the
first driver unit and the second driver unit are magnetized in the same direction in the direction
orthogonal to the diaphragm, and driving currents in opposite directions are supplied to the
voice coils. In this speaker device, the voice coil is inclined and driven since the first and second
driver units are arranged in parallel at a position where the diaphragm is displaced from the
center to one side in the longitudinal direction. At this time, in the speaker device, the opposing
surfaces of the magnetic gaps of the first and second driver units are formed in a curved curved
surface, so that the voice coil is prevented from colliding with the opposing surfaces of the
magnetic gaps.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION A speaker device to which the present
invention is applied will be described below with reference to the drawings.
[0013]
As shown in FIG. 1, the speaker unit 1 includes a driver unit 4 for vibrating the diaphragm 3 in a
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rectangular cabinet 2 and covers the opening 2a of the cabinet 2 serving as a sound emitting
surface. Thus, the flat diaphragm 3 is disposed.
[0014]
As shown in FIGS. 1 and 2, the diaphragm 3 has rigidity and is formed in a substantially
rectangular plate shape.
Further, the vibration plate 3 is provided with a mounting hole 5 for mounting a bobbin
constituting the driver unit 4.
The mounting hole 5 is provided at a position displaced from the center of the diaphragm 3 to
one side in the longitudinal direction. That is, as shown in FIG. 2, the mounting hole 5 is located
at a position where the diaphragm 3 is displaced to one side from the center line P 2 in the short
side direction of the diaphragm 3 on the center line P 1 in the longitudinal direction of the
diaphragm 3. Provided. The diaphragm 3 has a relationship of L3> L0 between the length L3
from the mounting hole 5 to one end 6 in the longitudinal direction and the length L0 from the
mounting hole 5 to the other end 7 in the longitudinal direction. It is formed to be Then, the tip
end side of the bobbin is bonded to the mounting hole 5 by an adhesive or the like. When the
driver unit 4 is driven, the diaphragm 3 has a length L3 from the mounting hole 5 to one end 6
in the longitudinal direction from a length L0 from the mounting hole 5 to the other end 7 in the
longitudinal direction. Due to the lengthening, one end 6 vibrates more than the other end 7 and
the whole is vibrated to tilt.
[0015]
The diaphragm 3 is supported at the open end of the opening 2a of the cabinet 2 via the edges 9
and 10 at both side edges in the short side direction. The edge 9 supports one end 6 side, and the
edge 10 supports the other end 7 side. The amount of displacement of the edge 9 is made larger
than that of the edge 10 because one end 6 vibrates more than the other end 7. That is, in the
diaphragm 3, both side edges in the long side direction are not supported by the cabinet 2, and
the short side direction is supported by the edges 9 and 10 at the open end of the opening 2 a of
the cabinet 2.
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[0016]
The driver unit 4 to which such a diaphragm 3 is attached is disposed on the bottom of the
cabinet 2 so that the bobbin is attached to the attachment hole 5, as shown in FIG. As shown in
FIG. 1, the driver unit 4 has an inner magnetic type magnetic circuit unit 12 that forms a
magnetic field. The magnetic circuit unit 12 has a yoke 13. The yoke 13 is formed in a bowl
shape by a high permeability material. As shown in FIGS. 1 and 3, the yoke 13 is fixed to the
bottom of the cabinet 2 by the screw 14 with the open end on the diaphragm 3 side, and the
magnetic flux radiated from the magnet 16 is centered on the bottom. The magnet 16 is disposed
via the nonmagnetic material 15 which blocks the current. The magnet 16 is formed in a
substantially cylindrical shape, and is magnetized in a line segment direction connecting the
center of the diaphragm 3 and the center of the mounting hole 5 to which the driver unit 4 is
attached, that is, in the longitudinal direction of the diaphragm 3. For example, the magnet 16
has an S pole in the right direction in FIGS. 1 and 3 and an N pole in the left direction in FIGS. 1
and 3.
[0017]
As shown in FIG. 3, the magnet 16 is supported by center poles 17a and 17b whose outer
peripheral surface is disposed on the nonmagnetic material 15. As shown in FIG. The center
poles 17a and 17b are divided into two and each is formed in a semicircular arc shape by a high
permeability material. Between the center poles 17a and 17b, gaps 18 and 18 are provided to set
the center pole 17a as an S pole and the center pole 17b as an N pole. The center pole 17a, 17b
is formed with a flange at its tip end, and the outer peripheral surface of the flange is formed
with a curved curved surface 19a, 19b having a substantially arc-shaped cross section.
[0018]
A top plate 21 made of a high magnetic permeability material is attached to an end of the yoke
13 on the side of the diaphragm 3. The top plate 21 allows the center poles 17a and 17b to face
the circular opening 20 at the center. As shown in FIG. 1, on the end face of the opening 20
facing the curved surface portions 19a and 19b, a curved surface portion 22 having a
substantially arc-shaped cross section is formed by swelling. The gaps formed by the curved
surface portions 19a and 19b of the center poles 17a and 17b and the curved surface portion 22
of the top plate 21 are magnetic gaps 23a and 23b. A magnetic field is formed in the magnetic
gaps 23a and 23b by magnetic flux in the same direction. Specifically, a magnetic field is formed
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in the magnetic gap 23b by the magnetic flux B2 directed from the curved surface 19b of the
center pole 17a to the curved surface 22 of the top plate 21, and the magnetic gap 23a is formed
by the curved surface 22 of the top plate 21 at the center. A magnetic field is formed by the
magnetic flux B1 directed to the curved surface 19a of the pole 17a. The top plate 21 may be
formed integrally with the yoke 13.
[0019]
In the magnetic gaps 23a and 23b, as shown in FIG. 1, a cylindrical bobbin 24 whose tip is joined
to the mounting hole 5 of the diaphragm 3 is inserted. A voice coil 25 to which a drive current
corresponding to an audio signal is supplied is wound around the outer peripheral surface of the
bobbin 24 on the proximal end side facing the distal end. The voice coil 25 is opposed to the
curved surface portion 22 of the top plate 21 by inserting the bobbin 24 into the magnetic gaps
23a and 23b. The bobbin 24 is supported by the damper 26 on the magnetic circuit unit 12. The
damper 26 is formed in a ring shape, and the inner peripheral end is joined to the outer
peripheral surface of the bobbin 24, and the outer peripheral end is joined to the top plate 21 to
support the bobbin 24. The tip of such a bobbin 24 is joined to the attachment hole 5 of the
diaphragm 3. A cap 27 is attached to the bobbin 24 at an end facing outward from the
diaphragm 3.
[0020]
As shown in FIG. 1, when the drive current corresponding to the audio signal is supplied to the
voice coil 25, the speaker apparatus 1 as described above vibrates the diaphragm 3 as follows.
That is, since magnetic fields are formed in the magnetic gaps 23a and 23b by the magnetic
fluxes B1 and B2 in the same direction, the bobbin 24 receives the magnetic flux in the magnetic
gap 23a when the drive current is supplied to the voice coil 25. A driving force is generated by
the action of the driving current supplied to the voice coil 25, and operates up and down in a
state of being inclined to the right or left in FIG. When one end 6 of the diaphragm 3 is inclined
in the direction of arrow X1 in FIG. 1, the other end 7 is inclined in the direction of arrow X2 in
FIG. 1, and one end 6 is in the direction of arrow X3 in FIG. When the other end 7 is inclined in
the direction of arrow X4 in FIG. 1, it vibrates to be inclined in the longitudinal direction as a
whole. Specifically, as shown in FIG. 4, the amplitude x1 + x2 of the diaphragm 3 is expressed by
the following equation.
[0021]
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[Equation 1]
[0022]
As a result, the speaker device 1 can be improved in reproducibility.
Further, the speaker device 1 can be miniaturized as a whole by using the flat diaphragm 3.
[0023]
The facing surfaces of the magnetic gaps 23a and 23b are formed by the curved surface portions
19a and 19b and the curved surface portion 22. Therefore, in the speaker device 1, even when
the bobbin 24 is driven in an inclined manner as described above, the bobbin 24 and the voice
coil 25 are prevented from colliding with the wall surfaces of the magnetic gaps 23a and 23b,
and a collision sound is generated. Is prevented. Further, the magnetic gaps 23a and 23b are
formed by the curved surface portions 19a and 19b and the curved surface portion 22, so that
the distance between the magnetic gaps 23a and 23b in the width direction can be narrowed and
the magnetic gaps 23a and 23b are made deeper. The bobbin 24 can be vibrated to a large
extent. Accordingly, the speaker device 1 can be miniaturized.
[0024]
Although the case where the magnet 16 is supported by the center poles 17a and 17b divided
into two parts in the magnetic circuit unit 12 of the speaker device 1 has been described above,
the magnetic circuit unit 12 has the following configuration. You may In the magnetic circuit unit
30, as shown in FIG. 5, the nonmagnetic material 32 is disposed at the center of the bottom of
the wedge-shaped yoke 31, and the disk-shaped magnet 33 is disposed on the nonmagnetic
material 32. Become. The magnet 33 bulges to the outer peripheral surface to form a curved
surface portion 34 having a substantially arc-shaped cross section. In addition, a top plate 35
provided with an opening 35 a at a central portion is attached to an end on the upper surface
side of the yoke 31. The top plate 35 allows the magnet 33 to face the circular opening 35 a at
the center. As shown in FIG. 1, a curved surface portion 36 having a substantially arc-shaped
cross section is formed on an end face of the opening 35 a facing the curved surface portion 34,
as shown in FIG. 1. The gaps formed by the curved surface portion 34 of the magnet 33 and the
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curved surface portion 36 of the top plate 35 are the magnetic gaps 37a and 37b. A magnetic
field is formed in the magnetic gaps 37a and 37b by magnetic flux in the same direction.
Specifically, a magnetic field is formed in the magnetic gap 37b by the magnetic flux B2 directed
from the curved surface portion 34 of the magnet 33 to the curved surface portion 36 of the top
plate 35, and the magnetic gap 37a includes the curved surface portion 36 of the top plate 35 to
the magnet 33. A magnetic field is formed by the magnetic flux B1 directed to the curved surface
portion 34 of FIG.
[0025]
In the speaker device 1 provided with such a magnetic circuit unit 30, a driving current is
supplied to the voice coil 25 because the magnetic flux is directed in the same direction to form a
magnetic field in the magnetic gaps 37a and 37b. As a result, the bobbin 24 is driven to tilt as
described above, and the diaphragm 3 joined to the bobbin 24 is greatly vibrated. At this time, in
the speaker device 1, the wall surfaces of the magnetic gaps 37a and 37b are formed by the
curved portions 34 and 36, so that the bobbin 24 and the voice coil 25 are prevented from
colliding with the wall surfaces of the magnetic gaps 37a and 37b. And the generation of a
collision sound is prevented. In addition, the magnetic gaps 37a and 37b are formed by the
curved surface portions 34 and 36, so that the space between the magnetic gaps 37a and 37b in
the width direction can be narrowed and without making the magnetic gaps 37a and 37b deeper.
The bobbin 24 can be vibrated to a large extent. Accordingly, the speaker device 1 can be
miniaturized. Furthermore, since the speaker device 1 does not use the center poles 17a and 17b
as the magnetic circuit unit 12 described above, the magnetic circuit unit 30 can reduce the
number of parts.
[0026]
The magnetic circuit unit 12 can also be configured as follows. The magnetic circuit portion 39 is
an external magnet type, and as shown in FIG. 6, a ring-shaped magnet 41 is disposed on the
outer periphery of the yoke 40 on a disc, and a ring-shaped top plate 42 is disposed on the
magnet 41. It will be set up. The top plate 42 bulges to the end face on the inner peripheral side
to form a curved surface portion 42 a having a substantially arc-shaped cross section. In the
magnetic circuit unit 39, the nonmagnetic material 43 is disposed at the center of the yoke 37,
and the center pole 44 is fixed on the nonmagnetic material 43 by a screw 44b. The center pole
44 is expanded on an outer peripheral surface facing the curved surface portion 42 a of the top
plate 42 to form a curved surface portion 44 a having a substantially arc-shaped cross section.
The gaps formed by the curved surface portion 42 a of the top plate 42 and the curved surface
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portion 44 a of the center pole 44 are the magnetic gaps 45 a and 45 b. A magnetic field is
formed in the magnetic gaps 45a and 45b by the magnetic flux in the same direction.
Specifically, a magnetic field is formed in the magnetic gap 45b by the magnetic flux B2 directed
from the curved surface 42a of the top plate 42 to the curved surface 44a of the center pole 44,
and the magnetic gap 45a is formed from the curved surface 44a of the center pole 44 A
magnetic field is formed by the magnetic flux B1 directed to the curved surface portion 42a of
the plate 42.
[0027]
In the speaker device 1 provided with such a magnetic circuit portion 39, the magnetic flux is
directed in the same direction to form the magnetic field in the magnetic gaps 45a and 45b, so
the bobbin 24 is driven in an inclined manner. The diaphragm 3 joined to 24 vibrates largely. At
this time, in the speaker device 1, the wall surfaces of the magnetic gaps 45a and 45b are formed
by the curved portions 42a and 44a, so that the bobbin 24 and the voice coil 25 are prevented
from colliding with the wall surfaces of the magnetic gaps 45a and 45b. And the generation of a
collision sound is prevented. In addition, the magnetic gaps 45a and 45b are formed by the
curved portions 42a and 42b, whereby the distance between the magnetic gaps 45a and 45b in
the width direction can be narrowed and without making the magnetic gaps 45a and 45b deeper.
The bobbin 24 can be vibrated to a large extent. Accordingly, the speaker device 1 can be
miniaturized.
[0028]
Furthermore, the magnetic circuit unit 12 can be configured as follows. In the magnetic circuit
portion 46, as shown in FIG. 7, a yoke 47 is formed to have a substantially U-shaped cross
section, and a magnet 48 is disposed at the center of the rectangular bottom surface of the yoke
47 via the nonmagnetic material 15. Become. The magnet 48 is formed in a substantially
elliptical cross section, with the left direction in FIG. 7 being the N pole and the right direction in
the FIG. 7 being the S pole with the longitudinal axis as a boundary. In the magnet 48, curved
surface portions 48a and 48b having a substantially arc-shaped cross section are formed so as to
expand in the height direction of the outer peripheral surface on the upper end side forming the
magnetic gap. Further, top plates 49, 49 are attached to the upper open end of the yoke 47. The
top plates 49, 49 are each formed in a rectangular shape, and the end surfaces facing each other
are opposed to the curved surface portions 48a, 48b of the magnet 48. That is, the top plates 49,
49 are disposed to face each other in the longitudinal direction of the magnet 48, and the magnet
48 is disposed between the top plates 49, 49. Further, curved end portions 49a and 49b having a
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substantially arc-shaped cross section are formed on the end surfaces of the top plates 49 and 49
facing each other so as to bulge. The gaps formed by the curved surface portions 48a and 48b of
the magnet 48 and the curved surface portions 49a and 49b of the top plates 49 and 49 are the
magnetic gaps 50a and 50b. A magnetic field is formed in the magnetic gaps 50a and 50b by
magnetic flux in the same direction. Specifically, a magnetic field is formed in the magnetic gap
37b by the magnetic flux B2 directed from the curved surface portion 48b of the magnet 48 to
the curved surface portion 49b of the top plate 49, and the magnetic gap 50a includes the
curved surface portion 49a of the top plate 49 to the magnet 48. A magnetic field is formed by
the magnetic flux B1 directed to the curved surface portion 48a of
[0029]
In the speaker device 1 provided with such a magnetic circuit portion 46, since the magnetic flux
is directed in the same direction to form the magnetic field in the magnetic gaps 50a and 50b,
the bobbin 24 is driven in an inclined manner. The diaphragm 3 joined to 24 vibrates largely. At
this time, the speaker device 1 is formed on the curved surface portions 48a and 48b of the
magnet 48 and the curved surface portions 49a and 49b of the top plates 49 and 49 serving as
the wall surfaces of the magnetic gaps 50a and 50b. It is prevented that 25 collides with the wall
surface of magnetic gap 50a, 50b, and it is prevented that a collision sound generate | occur |
produces. Further, the magnetic gaps 50a and 50b are formed by the curved surface portions
48a, 48b, 49a and 49b, whereby the distance between the magnetic gaps 50a and 50b in the
width direction can be narrowed and the magnetic gaps 50a and 50b are made deeper. The
bobbin 24 can be vibrated to a large extent. Accordingly, the speaker device 1 can be
miniaturized.
[0030]
Next, another speaker device 51 to which the present invention is applied will be described with
reference to the drawings. The speaker device 51 is characterized in that two driver units for
vibrating a diaphragm are disposed in a cabinet. In the speaker device 51, as shown in FIGS. 8
and 9, two driver units 54 and 55 for vibrating the diaphragm 53 are disposed in a rectangular
cabinet 52, and an opening of the cabinet 52 serving as a sound emitting surface is provided. A
flat diaphragm 53 is disposed to cover the portion 52a.
[0031]
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11
As shown in FIGS. 8 and 9, the diaphragm 53 is rigid and has a substantially rectangular flat
plate shape. The vibrating plate 53 is provided with mounting holes 56 and 57 for mounting the
bobbins constituting the driver units 54 and 55, respectively. The mounting holes 56 and 57 are
provided in parallel at a position displaced from the center of the diaphragm 53 to one side in
the longitudinal direction. That is, as shown in FIG. 9, mounting holes 56 and 57 are provided
parallel to each other at a position displaced to one side from center line P4 in the short side
direction of diaphragm 53 on center line P3 in the longitudinal direction of diaphragm 53 Be The
mounting hole 56 of the driver unit 54 is provided at the center of the diaphragm 53, and the
mounting hole 57 of the driver unit 55 is provided on the outer peripheral side of the diaphragm
53. The diaphragm 53 has a length L2 from the mounting hole 56 to one end 58 of the
diaphragm 53, a length L1 between the mounting holes 56 and 57, and the other end of the
diaphragm 53 from the mounting hole 57. The relationship with the length L0 to the part 59 is
formed such that L2> L1> L0. Then, the tip end sides of the respective bobbins are joined to the
mounting holes 56 and 57 by an adhesive or the like. When the driver unit 54 or 55 is driven,
the vibration plate 53 has its amplitude proportional to its length, and one end 58 vibrates more
than the other end 59, so that the whole is tilted.
[0032]
The vibrating plate 53 is supported at the open end of the opening 52a of the cabinet 52 via the
edges 61 and 62 at both side edges in the short side direction. The edge 61 supports one end 58
side, and the edge 62 supports the other end 59 side. The amount of displacement of the edge 61
is larger than that of the edge 62 because one end 58 vibrates more than the other end 59. That
is, the diaphragm 53 is in a state in which the long side direction is not supported by the cabinet
52 and the short side direction is supported by the edges 61 and 62 at the opening end of the
opening 52 a of the cabinet 52.
[0033]
The driver units 54 and 55 to which such a diaphragm 53 is attached are disposed on the bottom
of the cabinet 52 so that the respective bobbins are attached to the attachment holes 56 and 57
as shown in FIG. Ru. As shown in FIG. 8, these driver units 54 and 55 have magnetic circuit units
63 and 64 of the inner magnet type that forms a magnetic field. The magnetic circuit portions 63
and 64 have yokes 65 and 66, and the yokes 65 and 66 are formed in a bowl shape of a high
permeability material. The yokes 65 and 66 are fixed to the bottom of the cabinet 52 with
screws, adhesives, etc., with the open end on the diaphragm 53 side. The substantially cylindrical
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magnets 67 and 68 are attached to the bottom of the yokes 65 and 66, respectively. The
magnets 67 and 68 are magnetized in the direction orthogonal to the diaphragm 53. The magnet
67 of the driver unit 54 and the magnet 68 of the driver unit 55 are opposite in magnetization
direction in the direction orthogonal to the diaphragm 53. Specifically, in FIG. 8, the magnet 67
of the driver unit 54 has the N pole at the diaphragm 53 side, and the S pole at the bottom of the
cabinet 52, and the magnet 68 of the driver unit 55 has the S pole at the diaphragm 53 side. The
bottom of the cabinet 52 is N pole. Center poles 69 and 70 made of a high magnetic permeability
material are attached to the vibrating plate 53 side of the magnets 67 and 68. The center pole
69, 70 has a flange at its tip, and a curved surface 71, 72 having a substantially arc-shaped cross
section that bulges out on the outer peripheral surface of the flange.
[0034]
Further, top plates 73 and 74 made of a high magnetic permeability material are attached to the
ends of the yokes 65 and 66 on the diaphragm 53 side. The top plates 73 and 74 have circular
openings 73a and 74a at the center, and allow the center poles 69 and 70 to face through the
openings 73a and 74a. Curved surface portions 75 and 76 having a substantially arc-shaped
cross section are formed on the end surfaces of the openings 73 a and 74 a facing the curved
surface portions 71 and 72, respectively. Then, the gaps formed by the curved surface portions
71 and 72 of the center poles 69 and 70 and the curved surface portions 75 and 76 of the top
plates 73 and 74 are magnetic gaps 77 and 78. In the magnetic gaps 77 and 78, since the
magnets 67 and 68 are magnetized in the directions opposite to each other, a magnetic field is
formed by the magnetic flux in the opposite direction. Specifically, in the magnetic gap 77 of the
driver unit 54, a magnetic field is formed by the magnetic flux B3 directed from the curved
surface portion 71 of the center pole 69 to the curved surface portion 75 of the top plate 73.
Further, in the magnetic gap 78 of the driver unit 55, a magnetic field is formed by the magnetic
flux B4 directed from the curved surface portion 76 of the top plate to the curved surface portion
76 of the center pole 70. That is, in the magnetic gaps 77 and 78 of the driver units 54 and 55, a
magnetic field is formed by the magnetic flux in the opposite direction. The top plates 73 and 74
may be integrally formed with the yokes 65 and 66, respectively.
[0035]
In the magnetic gaps 77, 78, cylindrical bobbins 79, 80 whose tip portions are joined to the
mounting holes 56, 57 of the diaphragm 53 are inserted. On the bobbins 79 and 80, voice coils
81 and 82 to which a drive current corresponding to an audio signal is supplied are wound
around the outer peripheral surface on the base end side facing the tip end. The voice coils 81
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and 82 are opposed to the curved portions 75 and 76 of the top plates 73 and 74 by inserting
the bobbins 79 and 80 into the magnetic gaps 77 and 78, respectively. The voice coils 81 and 82
are supplied with drive current in the same direction.
[0036]
The bobbins 79 and 80 are supported by the dampers 83 and 84 on the magnetic circuit units
63 and 64, respectively. The dampers 83 and 84 are formed in a ring shape, and the inner
peripheral ends thereof are joined to the outer peripheral surface of the bobbins 79 and 80, and
the outer peripheral ends are joined to the top plates 73 and 74 to support the bobbins 79 and
80. The tips of the bobbins 79 and 80 are joined to the attachment holes 56 and 57 of the
diaphragm 53. Note that caps 85 and 86 are attached to the bobbins 79 and 80 at the end facing
outward from the diaphragm 53.
[0037]
When the drive current corresponding to the audio signal is supplied to the voice coils 81 and
82, the speaker device 51 as described above vibrates the diaphragm 53 as follows. That is, since
magnetic fields are formed by magnetic fluxes reverse to each other in the magnetic gaps 77 and
78, when drive currents in the same direction are supplied to the voice coils 81 and 82, the
bobbin 79 of the driver unit 54 and the driver With the bobbin 80 of the unit 55, a driving force
in the vertical direction is generated with respect to the diaphragm 53 by the action of the
magnetic flux in the magnetic gaps 77, 78 and the driving current supplied to the voice coils 81,
82. Drive to Specifically, when the bobbin 79 operates in the direction of arrow X5 in FIG. 8, the
bobbin 80 operates in the direction of arrow X6 in FIG. When the bobbin 79 operates in the
direction of arrow X9 in FIG. 8, the bobbin 80 operates in the direction of arrow X10 in FIG.
Therefore, when one end 58 of the diaphragm 53 is inclined in the direction of arrow X7 in FIG.
8, the other end 59 is inclined in the direction of arrow X8 in FIG. 8, and one end 58 is in the
direction of arrow X11 in FIG. When the other end portion 59 is inclined in the direction of
arrow X12 in FIG. 8 when it is inclined, it vibrates so as to be inclined in the longitudinal
direction as a whole. The speaker device 51 can achieve downsizing as a whole by using the flat
diaphragm 53, and since the magnets 67 and 68 are magnetized in the directions opposite to
each other, the bobbins 79 and 80 are always reversed. By driving in the direction, the
diaphragm 53 can be vibrated to a large extent, and the reproducibility can be improved.
[0038]
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At this time, the diaphragm 53 as a whole is inclined in any one of the longitudinal directions,
and along with this, the bobbins 79 and 80 joined to the diaphragm 53 are also inclined. The
opposing surfaces of 78 are formed by the curved surface portions 71, 72 of the center pole 69,
70 and the curved surface portions 75, 76 of the top plates 73, 74, so the bobbins 79, 80 and
the voice coils 81, 82 A collision with the wall surfaces of 77 and 78 is prevented, and the
generation of a collision sound is prevented. In addition, the magnetic gaps 77 and 78 are
formed by the curved surface portions 71 and 72 of the center pole 69 and 70 and the curved
surface portions 75 and 76 of the top plates 73 and 74, respectively. The bobbins 79 and 80 can
be greatly vibrated without making the magnetic gaps 77 and 78 deeper. Therefore, the speaker
device 51 can be miniaturized.
[0039]
Incidentally, as described above, the magnets 67 and 68 are magnetized in the reverse direction
in the direction orthogonal to the diaphragm 53, and driving currents in the same direction are
supplied to the voice coils 81 and 82 to reverse the bobbins 79 and 80. Although the case of
vibrating in the direction has been described, the present invention magnetizes the magnets 67
and 68 in the same direction and supplies driving current in the reverse direction to the voice
coils 81 and 82 to reverse the bobbins 79 and 80. It may be made to vibrate.
[0040]
Further, the present invention may be applied to a speaker apparatus in which a substantially
conical diaphragm is supported by the above-mentioned magnetic circuit portion.
In the speaker device having the substantially conical diaphragm, the wall surface of the
magnetic gap is formed as a curved surface, so that the voice coil is prevented from colliding
with the opposing surface of the magnetic gap, and the generation of collision sound is
prevented. Ru.
[0041]
According to the speaker device of the present invention, the voice coil collides with the
opposing surface of the magnetic gap by forming the opposing surface of the magnetic gap of
the magnetic circuit portion on a curved curved surface. Is prevented and the generation of a
collision noise is prevented.
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[0042]
Further, according to the speaker device of the present invention, since the driver unit supports
the diaphragm at a position displaced in the longitudinal direction from the center of the
diaphragm, the voice coil is driven in an inclined state. However, since the opposing surface of
the magnetic gap is formed in a curved curved surface, the voice coil is prevented from colliding
with the opposing surface of the magnetic gap, and the generation of the collision noise is
prevented.
[0043]
Furthermore, according to the speaker device of the present invention, since the first and second
driver units support the diaphragm in parallel at a position displaced from the center to one side
in the longitudinal direction, a voice coil can be provided. However, since the opposing surfaces
of the magnetic gaps of the first and second driver units are formed on the curved curved
surfaces, the voice coil may collide with the opposing surfaces of the magnetic gaps. It is
prevented and it is prevented that a collision sound is generated.
[0044]
Brief description of the drawings
[0045]
1 is a cross-sectional view of a speaker device to which the present invention is applied.
[0046]
2 is a plan view of the same speaker device.
[0047]
3 is a plan view of the magnetic circuit portion of the speaker device.
[0048]
4 is a diagram for explaining the amplitude of the diaphragm of the same speaker device.
[0049]
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5 is a cross-sectional view of a magnetic circuit portion in which a magnetic gap is formed by the
end face of the magnet and the end face of the yoke.
[0050]
6 is a cross-sectional view of a magnetic circuit portion in which a magnet is disposed on the
outer peripheral side.
[0051]
7 is a plan view of a magnetic circuit portion in which a magnet is disposed at the center of the
yoke via a nonmagnetic material.
[0052]
8 is a cross-sectional view of another speaker device to which the present invention is applied.
[0053]
9 is a plan view of the speaker device.
[0054]
10 is a cross-sectional view of a speaker device supported in a cantilevered state of the
diaphragm in the housing.
[0055]
Explanation of sign
[0056]
DESCRIPTION OF SYMBOLS 1 Speaker apparatus, 2 cabinet, 3 diaphragm, 4 driver unit, 6 1st
vibration part, 7 2nd vibration part, 12 magnetic circuit part, 13 yoke, 16 magnets, 15
nonmagnetic materials, 17a, 17b Center pole , 19a, 19b curved surface portion, 21 top plate, 22
curved surface portion, 23a, 23b magnetic gap, 24 bobbin, 25 voice coil
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