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DESCRIPTION JP2009188791

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DESCRIPTION JP2009188791
PROBLEM TO BE SOLVED: To reduce stress to a junction between a top portion (folded back
portion) of a diaphragm and a damper with a relatively simple configuration, to suppress
separation at a junction between a diaphragm and a damper, and a diaphragm And suppressing
abnormal noise due to contact between the damper and the damper, providing a relatively
compact speaker device, etc. A speaker device 100 has an inner peripheral edge 8A connected to
a voice coil bobbin 6, an outer peripheral edge 8B connected to a frame 5 via an edge 9, and a
top (turnback portion) between the inner peripheral edge 8A and the outer peripheral edge 8B.
8C) is formed, and the diaphragm 8 is formed such that the inner peripheral edge 8A and the
outer peripheral edge 8B are located on the acoustic radiation side relative to the folded portion
8C, and the voice coil 7 disposed on the voice coil bobbin 6 is driven. The outer peripheral edge
10A is connected to the frame 5, and one end on the inner peripheral side is formed into a
groove shape corresponding to the shape of the folded portion 8C of the diaphragm 8, and the
diaphragm 8 And a damper 10 for supporting the folded back portion 8C. [Selected figure]
Figure 2
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
The inner peripheral edge is connected to the voice coil bobbin, and the outer peripheral edge
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has a diaphragm connected to the frame via an edge, and a top (turnback) is formed between the
inner peripheral edge and the outer peripheral edge of the diaphragm Speaker devices are
known (see, for example, Patent Document 1).
In the above speaker device, the top portion (folded back portion) of the diaphragm is supported
at a substantially central portion between the inner periphery and the outer periphery of the
damper.
[0003]
Unexamined-Japanese-Patent No. 11-355883
[0004]
However, in the above speaker device, the top portion (turned-back portion) of the diaphragm is
supported at a substantially central portion between the inner periphery and the outer periphery
of the damper, but the bonding area between the diaphragm and the damper is relatively small.
Since the strength is relatively small, problems such as peeling may occur.
[0005]
Further, in the speaker device having the above configuration, for example, the side surface near
the top of the diaphragm may come in contact with the radial cross-section convex portion of the
damper, which may cause a problem such as noise.
[0006]
Further, although the external magnet type magnetic circuit is adopted in the above speaker
device, a ring-shaped magnet or ring shape of the external magnetic type magnetic circuit is
provided radially outside of the voice coil loosely fitted in the magnetic gap of this magnetic
circuit. Since the plate is formed, it may be difficult to miniaturize the speaker device.
[0007]
The present invention takes an example of the problem to address such a problem.
That is, with a relatively simple configuration, reducing the stress on the junction between the
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top (turnback) of the diaphragm and the damper, suppressing separation at the junction between
the diaphragm and the damper, and the diaphragm It is an object of the present invention to
suppress abnormal noise due to contact of a damper, to provide a relatively compact speaker
device, and the like.
[0008]
In order to achieve such an object, the present invention at least comprises the configurations
according to the following independent claims.
In the speaker device according to the present invention, the inner peripheral edge is connected
to the voice coil bobbin, the outer peripheral edge is connected to the frame via the edge, and a
turnback portion is formed between the inner peripheral edge and the outer peripheral edge And
a diaphragm in which the outer peripheral edge is formed on the acoustic radiation side relative
to the turnback portion, a magnetic circuit for driving a voice coil disposed on the voice coil
bobbin, and an outer peripheral edge connected to the frame And one end portion on the inner
peripheral side is formed in a groove shape folded back corresponding to the shape of the folded
portion of the diaphragm, and has a damper for supporting the folded portion of the diaphragm. .
[0009]
In the speaker device according to the embodiment of the present invention, the inner peripheral
edge is connected to the voice coil bobbin, the outer peripheral edge is connected to the frame
via the edge, and a turnback portion is formed between the inner peripheral edge and the outer
peripheral edge A diaphragm having a shape in which the peripheral edge and the outer
peripheral edge are located on the acoustic radiation side relative to the turnback portion, a
magnetic circuit for driving a voice coil disposed on a voice coil bobbin, and the outer peripheral
edge are connected to the frame One end portion on the inner peripheral side is formed in a
groove shape which is folded back corresponding to the shape of the folded portion of the
diaphragm, and has a damper for supporting the folded portion of the diaphragm.
[0010]
In the above speaker device, the outer peripheral edge of the damper is connected to the frame,
and one end on the inner peripheral side is formed in a groove shape folded back corresponding
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to the shape of the folded portion of the diaphragm, and one end on the inner peripheral side
Since the folded portion of the diaphragm is supported by the groove-shaped portion formed in
the portion, the junction of the top portion (folded back) of the diaphragm and the damper has a
relatively large junction area, and the junction to the junction Stress can be reduced.
Further, since the diaphragm and the damper have a relatively large bonding area and are
bonded with a relatively large bonding strength, separation of the diaphragm and the damper
can be suppressed.
[0011]
Hereinafter, a speaker device according to an embodiment of the present invention will be
described with reference to the drawings.
[0012]
FIG. 1 is a view for explaining a speaker device 100 according to an embodiment of the present
invention.
In detail, FIG. 1 is a front view of the speaker device 100 as viewed from the front side (acoustic
emission side AA).
FIG. 2 is a cross-sectional view of the speaker device 100 shown in FIG. 1 taken along the line AA.
FIG. 3A is an enlarged cross-sectional view in the vicinity of the main part of the diaphragm and
the damper of the speaker device 100 shown in FIG. FIG. 3 (B) is an enlarged cross-sectional view
of the diaphragm shown in FIG. 3 (A).
[0013]
The speaker device 100 includes an inner magnetic type magnetic circuit 4 including a yoke 1, a
plate 2 and a magnet 3, a frame (speaker frame) 5, a voice coil 7 wound around a voice coil
bobbin 6, and a diaphragm 8. , An edge 9, a damper 10, a center cap portion 11, and a lead 12.
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[0014]
The inner magnet type magnetic circuit 4 corresponds to an embodiment of the magnetic circuit
according to the present invention.
The diaphragm 8 corresponds to an embodiment of the diaphragm according to the present
invention. The damper 10 corresponds to an embodiment of the damper according to the present
invention.
[0015]
The magnetic circuit 4 according to the present embodiment has a yoke 1, two magnets 3 (31), a
magnet 3 (32), two plates 2 (21), and a plate 2 (22). プレート2(21)はセンタープレートとも
いう。 The yoke 1 spreads radially outward from the bottom 1A joined to the bottom of the
magnet 3 (31) in a radial direction from the bottom 1A, and bends toward the acoustic radiation
direction (front), and the plate 1C And a side portion 1B of a shape extending to the side of 2
(21). Further, the bottom portion 1A and the side portion 1B of the yoke 1 are integrally formed.
In the yoke 1 according to the present embodiment, an inclined surface portion 1D is formed at
an outer peripheral side corner portion of an end portion on the acoustic radiation side of the
side portion 1B. Further, a hole 1H is formed in the central portion of the yoke 1. As a forming
material of the yoke 1, for example, an inorganic material, a metal, a magnetic substance such as
iron, or the like can be adopted.
[0016]
In the magnetic circuit 4, as shown in FIG. 2, the plate 2 (21) is disposed between the magnet 3
(31) and the magnet 3 (32), and the plate 2 (22) is placed on the magnet 3 (32). It is arranged.
The magnet 3 (31) and the magnet 3 (32) are disposed such that the same poles face each other,
and a magnetic circuit having such a configuration is called a so-called repulsive magnetic circuit.
By employing the repulsion type magnetic circuit, effects such as relatively high magnetic flux
density in the magnetic gap 4G and high sensitivity can be obtained. As a forming material of the
magnets 3 (31) and 3 (32), for example, a permanent magnet such as neodymium-based (rare
earth based), samarium-cobalt-based, alnico-based, or ferrite-based magnet can be adopted. As a
forming material of the plates 2 (21) and 2 (22), for example, a metal such as iron or a magnetic
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material can be adopted.
[0017]
In the magnetic circuit 4 according to this embodiment, the yoke 1, the magnet 3 (31), the plate
2 (21), the magnet 3 (32), and the plate 2 (22) are concentrically formed with respect to the
central axis O In detail, it is disposed close to a position coaxially and overlapping along the
central axis O direction. Moreover, the magnet 3 (31), the plate 2 (21), the magnet 3 (32), and
the plate 2 (22) may be formed in a ring shape. The magnet 3 (31) and the magnet 3 (32) of this
configuration are magnetized in such a way that the same pole is opposite along the thickness
direction (vibration direction), and the inner and outer side surfaces of the magnet 3 (31), 3 (32)
A magnetic gap may be formed, and a radial magnetic circuit provided with a so-called radial ring
magnet may be adopted as the magnetic circuit 4 in which the magnetic flux flowing direction
and the magnetic flux flowing in the magnetic circuit 4 are in the same direction. By employing a
radial magnetic circuit as the magnetic circuit 4, effects such as improvement in magnetic
efficiency, reduction in thickness, and reduction in size can be obtained.
[0018]
Further, in the magnetic circuit 4 according to the present embodiment, the magnet 3 (31) is
structured to be fixed to the yoke 1 made of iron or the like, so that the magnetic leakage can be
reduced.
[0019]
Further, as shown in FIG. 2, the magnetic circuit 4 has a magnetic gap 4G for driving the voice
coil 7, and the magnetic flux from the magnets 3 (31) and 3 (32) is concentrated in this magnetic
gap 4G. There is.
More specifically, the magnetic gap 4G is formed between the inner surface of the side portion
1B of the yoke 1 and the outer surface of the plate 2 (21), and is formed with a substantially
uniform gap over the entire circumference. ing.
[0020]
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As described above, the magnetic circuit 4 according to the present embodiment adopts a socalled repulsion type magnetic circuit including two magnets 3 (31) and 3 (32) arranged so that
the same poles face each other. It is not limited to For example, the speaker device may have a
magnetic circuit in which the magnet 3 (31) is disposed on the pole portion 1A of the yoke 1 and
only the plate 2 (21) is disposed on the magnet 3 (31). In the speaker device 100 having this
configuration, since the magnetic circuit including the yoke 1, the plate 2 (21), and the magnet 3
(31) is provided, it is possible to make the speaker device thinner and smaller. It becomes.
[0021]
As shown in FIGS. 1 and 2, in the frame 5, the magnetic circuit 4 is disposed at the center of the
back flat portion (bottom) 51 formed on the back side (BB), and at the center of the back flat
portion 51. An opening 5A is formed. In addition, the frame 5 has a cone-shaped portion 52
which is a cylindrical portion formed by bending from the outer peripheral edge of the rear flat
portion 51 to the acoustic radiation side. A flat portion 53 to which the outer peripheral edge
10A of the damper 10 is fixed is formed in the middle step of the cone-shaped portion 52 of the
frame 5, and the outer peripheral edge 9A of the edge 9 is directly or near the upper front side of
the cone-shaped portion 52 A flat portion 54 fixed via the joint member 90 is formed, and a
flange 55 is formed on the outer peripheral portion of the frame 5. In the cone-shaped portion
52, one or more window portions 52A and arm portions 52B are formed between the flat portion
53 and the flat portion 54. In the frame 5 according to the present embodiment, the back flat
portion 51, the cone-shaped portion 52, the flat portion 53, the flat portion 54, and the flange 55
are integrally formed.
[0022]
The voice coil 7 is formed, for example, by winding an electric wire around a cylindrical voice coil
bobbin 6 and is fixed to the voice coil bobbin 6 so that at least a part of the voice coil 7 can
vibrate in the magnetic gap 4G of the magnetic circuit 4 Be placed.
[0023]
The center cap portion 11 is formed, for example, to have an outer diameter substantially equal
to the inner diameter of the voice coil bobbin 6 and is connected to the voice coil bobbin 6 by
being fixed to the voice coil bobbin 6 with an adhesive or the like.
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The center cap portion 11 according to the present embodiment is formed in a convex shape
toward the acoustic radiation side. The center cap portion 11 may be formed in a concave shape
in order to thin the speaker device, and is not particularly limited.
[0024]
As a forming material of the diaphragm 8, for example, various materials such as polymer, such
as resin, paper, metal, etc. can be adopted. The diaphragm 8 has a ring-shaped acoustic radiation
surface from the inner peripheral edge 8A to the outer peripheral edge 8B, and the inner
peripheral edge 8A is formed with a central hole for connecting the voice coil bobbin 6. The
voice coil bobbin 6 is fitted in the central hole of the diaphragm 8 and fixed by an adhesive or the
like, so that the inner peripheral edge 8 A of the diaphragm 8 is connected to the vicinity of the
acoustic radiation side end of the voice coil bobbin 6. The outer peripheral edge 8 B of the
diaphragm 8 is attached to the frame 5 via the edge 9.
[0025]
The edge 9 is formed, for example, in a ring shape. As the edge 9, for example, various types of
edges such as a roll edge, a V-shaped edge, a corrugation edge, and a flat edge can be adopted. A
roll edge is employed as the edge 9 according to the present embodiment. The edge 9 has
appropriate compliance and rigidity, and the inner peripheral edge 9 B of the edge 9 is connected
to the outer peripheral edge 8 B of the diaphragm 8 by an adhesive or the like, thereby being
connected to the diaphragm 8. Further, as described above, the outer peripheral edge 9A of the
edge 9 is connected to the frame 5 by being fixed to the flat portion 54 of the frame 5 directly or
via the bonding member 90. The outer peripheral edge 8 B of the diaphragm 8 is connected to
the frame 5 via the edge 9. Therefore, the edge 9 elastically supports the outer peripheral edge
of the diaphragm 8. The edge 9 which concerns on this embodiment is formed in substantially
concave shape with respect to the acoustic radiation direction, as shown in FIG. In the speaker
device 100 provided with the edge 9 of the above configuration, the axial length is relatively
short with respect to the horizontal length.
[0026]
Further, as shown in FIGS. 1 and 2, the diaphragm 8 has a top (folded back) 8C formed between
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the inner peripheral edge 8A and the outer peripheral edge 8B, and the inner peripheral edge 8A
and the outer peripheral edge 8B are It is formed in the shape located in the sound emission side
compared with 8C. The top 8 C of the diaphragm 8 is fixed to the inner peripheral edge 10 B of
the damper 10 by an adhesive or the like. Further, as shown in FIGS. 3A and 3B, in the
diaphragm 8 according to the present embodiment, the thickness 8CL in the vicinity of the top
portion (turnback portion) 8C of the diaphragm 8 is the inner peripheral side diaphragm 81. Or
the thickness 82L of the outer peripheral side diaphragm 82. In the diaphragm 8 of this
configuration, since the top portion (folded portion 8C) has relatively high rigidity, it is possible
to suppress defects such as cracking and deformation due to stress and the like.
[0027]
The damper 10 is formed, for example, by impregnating a cloth with a resin and performing heat
forming. As shown in FIGS. 2 and 3 (A) and 3 (B), dampers of various shapes such as circular
dampers having concentric corrugations can be adopted as the damper 10, for example, and the
damper 10 has appropriate compliance. And the rigidity. The suspension portion of the damper
10 is formed of, for example, a plurality of curved portions 10H and linear portions 10G in a
radial direction cross-sectional shape. In the damper 10, the outer peripheral edge 10A of the
damper 10 is connected to the frame 5, and one end on the inner peripheral side (inner
peripheral edge 10B) is folded back corresponding to the shape of the folded portion (top 8C) of
the diaphragm 8 It is formed in a groove shape. The damper 10 supports the folded portion (the
top 8C) of the diaphragm 8 by the groove shaped portion 10C having the folded shape. At this
time, the inner peripheral side end portion 10B of the damper 10 supports the inside of the
(groove-shaped portion) folded portion 10C of the diaphragm 8.
[0028]
Further, the inner peripheral edge 10B of the damper 10 according to the present embodiment is
bent toward the acoustic radiation side along the inclined surface of the diaphragm 8, as shown
in FIGS. 2, 3 (A) and 3 (B). Since it is formed in a bent shape and is fixed to the top 8C by an
adhesive or the like, the inner peripheral edge 10B of the damper 10 and the top 8C of the
diaphragm 8 are securely fixed. Further, in the speaker device 100, as shown in FIGS. 1 and 2,
the damper 10, the flat portion 53 of the frame 5, the voice coil 7, the plate 2 (21), and the top
8C of the diaphragm 8 are substantially coplanar. It is formed as. In the speaker device 100
configured as described above, since the top 8C of the diaphragm 8 is set to be substantially the
same as the height of the damper 10, variations in the height of the top 8C of the diaphragm 8
can be reduced. Sound can be played to quality. In addition, since the top 8C of the diaphragm 8
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is set to be substantially the same as the height of the damper 10, assembling workability is
improved.
[0029]
Further, in the diaphragm 8 and the damper 10 configured as described above, since the junction
between the top (folded back) 8C of the diaphragm 8 and the damper 10 has a relatively large
junction area, the stress on the junction can be reduced. it can. Further, since the diaphragm 8
and the damper 10 are joined with a relatively large bonding strength, separation of the
diaphragm 8 and the damper 10 can be suppressed.
[0030]
Further, with the damper 10 and the diaphragm 8 configured as described above, by positioning
the groove shaped portion 10C of the damper 10 and the top portion (turnback portion) 8C of
the diaphragm 8 at the time of manufacturing the speaker, positioning with high accuracy. By
bonding and fixing with the adhesive 18 in this state, assembly can be performed with high
accuracy.
[0031]
Moreover, as shown to FIG. 3 (A) and 3 (B), the damper 10 which concerns on this embodiment
has the flat part 10L in the vicinity of the one end part by the side of inner circumference.
In detail, the flat portion 10L is formed, for example, between the groove shaped portion 10C
and the innermost circumferential side curved portion 10K of the suspension portion in a defined
length in the radial direction. Further, in the present embodiment, the innermost curved portion
10K is formed in a convex shape toward the acoustic radiation side.
[0032]
As described above, the damper 10 has a flat portion 10L of a prescribed length along the radial
direction between the grooved portion 10C having a folded shape and the innermost curved
portion 10K having a convex shape on the acoustic radiation side. Therefore, the outer peripheral
side diaphragm portion 82 of the diaphragm 8 and the innermost peripheral side curved portion
10K can be in non-contact with each other, and for example, abnormal noise due to contact can
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be suppressed.
[0033]
Further, the flat portion 10L also functions as a liquid reservoir portion of the adhesive used for
joining the damper 10 and the diaphragm 8, and suppresses a defect such as the protrusion of
the adhesive.
[0034]
Further, the damper 10 is not limited to the above configuration, and for example, a flat portion
10L is formed on the outer side in the radial direction from the groove shaped portion 10C
formed on the inner peripheral edge, and the diameter in the outer side of the flat portion 10L
The direction cross-sectional shape may form a convex-shaped part or a concave-shaped part
toward the acoustic radiation direction.
Moreover, the thickness of the damper 10 may be substantially uniform or nonuniform from the
inner peripheral edge to the outer peripheral edge, and is not particularly limited as long as the
top portion 8C of the diaphragm 8 can be supported.
[0035]
Further, the damper 10 having the above configuration elastically supports the diaphragm 8, the
center cap 11, the voice coil bobbin 6, and the voice coil 7 together with the edge 9 at a
predetermined position of the speaker when the speaker is not driven. The voice coil 7 and the
voice coil bobbin 6 disposed in 4 G are elastically supported at a position where the voice coil 7
and the voice coil bobbin 6 are not in contact with a portion constituting the magnetic circuit 4
such as the side portion 1B of the yoke 1.
Further, the damper 10 has a function of elastically supporting the center cap portion 11, the
diaphragm 8, the voice coil bobbin 6, and the voice coil 7 along the vibration direction (central
axis (O) direction) in driving the speaker. Further, since the inclined surface portion 1D is formed
on the outer peripheral side corner portion of the end portion on the sound radiation side of the
side portion 1B of the yoke 1, the diaphragm 8 vibrates in the direction of the central axis (O)
when the speaker is driven. It is possible to prevent the diaphragm 8 from coming into contact
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11
with the yoke 1 even when vibrating along the direction.
[0036]
Further, both ends of the voice coil 7 are drawn along the voice coil bobbin 6 and the diaphragm
8, respectively, and, for example, as shown in FIG. Connected to The lead wire 12 is, for example,
a tinsel wire resistant to bending formed by combining a plurality of thin wires, and is connected
to the input terminal portion 14 fixed to the frame 5 through the hole 13 formed in the
diaphragm 8 Ru.
[0037]
In the speaker device 100 configured as described above, when an audio signal is input to the
input terminal portion 14, a current corresponding to the audio signal is supplied to the voice
coil bobbin 6 through the lead wire 12. As a result, the voice coil bobbin 6 in the magnetic gap
4G is electromagnetically driven, and the center cap portion 11 and the diaphragm 8 connected
to the voice coil bobbin 6 are driven along the piston vibration direction while being supported
by the edge 9 and the damper 10 Then, reproduction sound corresponding to the audio signal is
emitted from the diaphragm 8.
[0038]
FIG. 4 is a cross-sectional view for explaining the diaphragm of the speaker device 100 shown in
FIG. Specifically, FIG. 4A is a view for explaining one specific example of the cross-sectional shape
of the diaphragm, and FIG. 4B is a view for explaining another specific example of the crosssectional shape of the diaphragm. FIG. 4C is a view for explaining the cross-sectional shape of the
diaphragm in detail.
[0039]
In the present embodiment, the diaphragm 8 has the following structure in order to suppress the
overall height of the speaker device 100 and to suppress the divided vibration of the diaphragm
8 in the driven state and to improve the sound pressure frequency characteristic in the high
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region. In detail, as shown in FIG. 1, FIG. 2, FIG. 4 (A) and FIG. 4 (B) FIG. 4 (C), the diaphragm 8
has a top (turned portion) between the inner peripheral edge 8A and the outer peripheral edge
8B ) 8C. The top 8C is a tip of the folded portion of the diaphragm 8, and is formed by being bent
at an acute angle so that the inner peripheral edge 8A and the outer peripheral edge 8B are
located on the acoustic radiation side relative to the top 8C.
[0040]
For example, as shown in FIGS. 4A to 4C, the diaphragm 8 includes an inner peripheral
diaphragm portion 81 formed on the inner peripheral edge 8A side from the top 8C of the
diaphragm 8, and the diaphragm 8 An outer peripheral side diaphragm portion 82 is formed
from the top 8C to the outer peripheral edge 8B side. The inner peripheral side diaphragm
portion 81 and the outer peripheral side diaphragm portion 82 are integrally formed.
[0041]
As shown in FIG. 4A in detail, the cross-sectional shape of the inner peripheral side diaphragm
portion 81 formed on the inner peripheral edge 8A side from the top 8C of the diaphragm 8 is
convex toward the acoustic radiation side as shown in FIG. The cross-sectional shape of the outer
peripheral side diaphragm portion 82 which is formed in a shape and is formed on the outer
peripheral edge 8B side from the top 8C of the diaphragm 8 is formed in a convex shape on the
acoustic radiation side.
[0042]
Further, as shown in FIG. 4B, in the diaphragm 8, the cross-sectional shape of the inner
peripheral side diaphragm portion 81 is formed in a convex shape on the sound radiation side,
and the cross-sectional shape of the outer peripheral side diaphragm portion 82A is It may be
formed in a substantially linear shape.
[0043]
Further, as shown in FIG. 4C, the diameter φA of the top 8C of the diaphragm 8 is smaller than
the diameter φB of the outer peripheral edge 8B of the diaphragm 8.
Further, the diameter φA of the top 8C is larger than the diameter C of the voice coil bobbin 6.
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In the diaphragm 8 according to this embodiment, as shown in FIG. 4C, the length R81 along the
radial direction from the inner peripheral edge 8A to the top 8C is along the radial direction from
the top 8C to the outer peripheral edge 8B. Preferably, it is formed to be substantially the same
as or shorter than the length R82. In the diaphragm 8 according to the present embodiment, as
shown in FIG. 4C, the diameter φB of the outer peripheral edge 8B of the diaphragm 8 is four
times or less the height D8 of the outer peripheral edge 8B of the diaphragm 8 Is preferred. The
height D8 of the outer peripheral edge 8B of the diaphragm 8 is a distance from the top 8C of
the diaphragm 8 to the outer peripheral edge 8B of the diaphragm 8 along the acoustic radiation
direction.
[0044]
In the speaker device 100 configured as described above, the vibration surface extending from
the inner peripheral edge 8A to the outer peripheral edge 8B is formed by being folded back at
the top 8C, so the height from the top 8C to the inner peripheral edge 8A or the outer peripheral
edge 8B is , And the height of the diaphragm 8. Therefore, the overall height of the diaphragm 8
can be made lower than that of a conventional cone-shaped diaphragm having the same diameter
(outer diameter of diaphragm) and voice coil diameter (inner peripheral edge 8A of diaphragm
8). Furthermore, in the diaphragm 8 according to the present embodiment, the diameter φA of
the top 8C of the diaphragm 8 is optimized with respect to the diameter φB of the outer
peripheral edge 8B of the diaphragm 8, and the inner peripheral diaphragm portion 81 is While
forming in a convex shape, forming the cross-sectional shape of the outer peripheral side
diaphragm portion 82 in a convex shape or a substantially linear shape, optimizing the diameter
φB and the height D8 of the outer peripheral edge 8B of the diaphragm 8, etc. The area
reproduction frequency characteristic can be improved. Even if the diaphragm 8 is formed by
any of the above conditions or a combination of two conditions or a combination of three
conditions, the high frequency reproduction frequency characteristics can be improved.
[0045]
That is, the speaker device 100 according to the present embodiment can make the speaker
device smaller in size, thinner and lighter than in the related art, and can reproduce sound with
high sound quality.
[0046]
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[Optimization of Cross-sectional Shape of Diaphragm] In FIG. 5A, the cross-sectional shape of the
inner peripheral side diaphragm portion 81 is formed in a substantially linear shape and the
cross-sectional shape of the outer peripheral side diaphragm portion 82 is concave toward the
acoustic radiation side. 5 (B) is a diagram showing simulation results of sound pressure
frequency characteristics of the speaker device adopting the diaphragm shown in FIG. 5 (A). is
there.
FIG. 5C relates to a first specific example in which the cross-sectional shape of the inner
peripheral side diaphragm portion 81 is formed in a convex shape and the cross-sectional shape
of the outer peripheral side diaphragm portion 82 is formed in a convex shape on the acoustic
radiation side. FIG. 5D is a cross-sectional view showing a diaphragm, and FIG. 5D is a diagram
showing simulation results of sound pressure frequency characteristics of the speaker device
adopting the diaphragm shown in FIG. 5C. FIG. 5E shows a diaphragm according to a second
specific example in which the cross-sectional shape of the inner peripheral side diaphragm
portion 81 is formed in a convex shape and the cross-sectional shape of the outer peripheral side
diaphragm portion 82 is formed in a substantially linear shape. FIG. 5F is a view showing
simulation results of sound pressure frequency characteristics of the speaker device adopting the
diaphragm shown in FIG. 5E.
[0047]
First, as shown in FIG. 5A, the cross-sectional shape of the inner peripheral side diaphragm
portion 81 is formed in a substantially linear shape, and the cross-sectional shape of the outer
peripheral side diaphragm portion 82 is formed in a concave shape on the acoustic radiation
side. In the diaphragm to be compared, as shown in FIG. 5 (B), the sound pressure level is about
60 dB at a frequency of about 30 Hz, and the sound pressure level rises from 30 Hz to 200 Hz to
85 dB at 200 Hz. Reaches a maximum value of about 97 dB at about 3 kHz, and then sharply
decreases from 3 kHz to 5 kHz at 5 kHz. It becomes about 67 Hz and rises from 5 kHz to 20 kHz
and shows a value of 75 dB at 20 kHz. In the speaker device according to this comparative
example, the high frequency limit frequency (high frequency resonance frequency) is
approximately 3 kHz.
[0048]
On the other hand, as shown in FIG. 5C, in the speaker device according to the first specific
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15
example of the present invention, the cross-sectional shape of the inner peripheral side
diaphragm portion 81 is formed in a convex shape and the outer peripheral side diaphragm
portion 82 The diaphragm 8 is formed so that the cross-sectional shape is convex toward the
acoustic radiation side. As shown in FIG. 5D, the sound pressure level is about 60 dB at a
frequency of about 30 Hz, and the sound pressure level rises from 30 Hz to 200 Hz, reaches 85
dB at 200 Hz, and from 200 Hz to 1 kHz, It has a substantially flat characteristic, rising from 1
kHz and decreasing after reaching a maximum of about 91 dB at about 4 kHz, decreasing after
reaching a maximum of about 91 dB at about 7 kHz, and decreasing at 65 dB at about 15 kHz
Indicate a value of 75 dB at 20 kHz, rising from about 15 kHz to 20 kHz. As described above, the
diaphragm 8 according to the first specific example of the present invention shown in FIG. 5C
has a high frequency (for example, about 3 kHz to about 10 kHz) as compared with the
comparative example shown in FIG. It can be confirmed that the frequency characteristic of) is
improved. That is, in the diaphragm 8 according to the first specific example of the present
invention shown in FIG. 5C, the high frequency limit reproduction frequency can be made
relatively large.
[0049]
Further, as shown in FIG. 5E, in the speaker device according to the second specific example of
the present invention, the cross-sectional shape of the inner peripheral side diaphragm portion
81 is formed in a convex shape and the outer peripheral side diaphragm portion 82 is formed.
The diaphragm 8 is formed so that the cross-sectional shape is substantially linear on the
acoustic radiation side. As shown in FIG. 5 (F), the sound pressure level is about 60 dB at a
frequency of about 30 Hz, and the sound pressure level rises from 30 Hz to 200 Hz, reaches 85
dB at 200 Hz, and from 200 Hz to 1 kHz. It has flat characteristics, rises from 1 kHz, decreases
after reaching a maximum value of about 95 dB at about 4.5 kHz, decreases less than 60 dB at
about 11 kHz, and increases from about 11 kHz to 20 kHz, at 20 kHz It shows a value of 75 dB.
As described above, in the diaphragm 8 according to the present invention shown in FIG. 5E, the
frequency characteristic of the high region (for example, about 3 kHz to about 10 kHz) is higher
than that of the comparative example shown in FIG. It has been confirmed that it has improved.
That is, in the diaphragm 8 according to the second specific example of the present invention
shown in FIG. 5 (E), the high frequency limit reproduction frequency can be made relatively large.
[0050]
[Optimization of the length A of the inner peripheral side diaphragm portion 81 and the length B
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of the outer peripheral side diaphragm portion 82] In FIG. 6A, the cross-sectional shape of the
inner peripheral side diaphragm portion 81 is formed substantially straight. The cross-sectional
shape of the outer peripheral side diaphragm portion 82 is formed in a substantially linear shape,
and the radial length A (the distance from the inner peripheral edge of the diaphragm 8 to the
top 8 C) of the inner peripheral side diaphragm portion 81 is FIG. 6B is a cross-sectional view
showing a diaphragm longer than the radial length B (the distance from the outer peripheral
edge of the diaphragm 8 to the top 8C) of the outer peripheral side diaphragm portion 82, and
FIG. It is a figure which shows the simulation result of the sound pressure frequency
characteristic of the speaker apparatus which employ | adopted the shown diaphragm. 6C, the
cross-sectional shape of the inner peripheral side diaphragm portion 81 is formed in a
substantially linear shape and the cross-sectional shape of the outer peripheral side diaphragm
portion 82 is formed in a substantially linear shape. FIG. 6 (D) is a cross-sectional view showing a
diaphragm having a length A in the radial direction substantially the same as a length B in the
radial direction of the outer peripheral side diaphragm portion 82, and FIG. It is a figure which
shows the simulation result of the sound pressure frequency characteristic of the employ |
adopted speaker apparatus. In FIG. 6E, the cross-sectional shape of the inner peripheral side
diaphragm portion 81 is formed in a substantially linear shape, and the cross-sectional shape of
the outer peripheral side diaphragm portion 82 is formed in a substantially linear shape. FIG. 6F
is a cross-sectional view showing a diaphragm whose length A in the radial direction is shorter
than the length B in the radial direction of the outer circumferential side diaphragm portion 82,
and FIG. 6F adopts the diaphragm shown in FIG. It is a figure which shows the simulation result
of the sound pressure frequency characteristic of the speaker apparatus which carried out.
[0051]
Next, as shown in FIGS. 6A to 6F, optimization of the length A (R 81) of the inner peripheral side
diaphragm portion 81 and the length B (R 82) of the outer peripheral side diaphragm portion 82
is performed. went. As shown in FIGS. 6A and 6B, when a diaphragm having a length A of the
inner peripheral side diaphragm portion 81 longer than a length B of the outer peripheral side
diaphragm portion 82 is adopted, Compared to the other cases, although the high frequency
characteristics are slightly inferior to the diaphragms shown in FIGS. 5A and 5B, the high
frequency limit frequency is large and the high frequency characteristics are improved. As shown
in FIGS. 6E and 6F, in the case where a diaphragm having a length A of the inner peripheral side
diaphragm portion 81 shorter than a length B of the outer peripheral side diaphragm portion 82
is adopted, It has been confirmed that the high frequency characteristic is improved compared to
the case of. That is, in the diaphragm 8 according to the present invention, it is preferable to
adopt a diaphragm in which the length A (R81) of the inner peripheral side diaphragm portion
81 is shorter than the length B (R82) of the outer peripheral side diaphragm portion 82 .
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[0052]
[Optimization of the Outer Diameter of the Diaphragm and the Height of the Diaphragm] In FIG.
7A, the cross-sectional shape of the inner peripheral side diaphragm portion 81 is formed
substantially linear, and the cross-sectional shape of the outer peripheral side diaphragm portion
82 Is formed in a substantially linear shape, and the height C of the outer peripheral edge of the
outer peripheral side diaphragm portion 82 (the height from the top 8C of the diaphragm 8 to
the outer peripheral edge of the outer peripheral side diaphragm portion 82) is Is substantially
the same as or smaller than the radial length D of the diaphragm 82 (the distance in the
horizontal direction from the folded portion 8C of the diaphragm 8 to the lower part of the outer
peripheral edge) It is a figure which shows the diaphragm formed in 4.8 times the height C of an
outer periphery, and FIG. 7 (B) is a sound pressure frequency characteristic of the speaker
apparatus which employ | adopted the diaphragm shown to FIG. 7 (A). It is a figure which shows
a simulation result. In FIG. 7C, the cross-sectional shape of the inner peripheral side diaphragm
portion 81 is formed in a substantially linear shape, and the cross-sectional shape of the outer
peripheral side diaphragm portion 82 is formed in a substantially linear shape. The height C of
the peripheral edge is larger than the radial length D of the outer peripheral side diaphragm
portion 82, and the outer diameter φB of the diaphragm 8 is 3.8 times the height C of the outer
peripheral edge of the outer peripheral side diaphragm portion 82 It is a figure which shows the
formed diaphragm, and FIG.7 (D) is a figure which shows the simulation result of the sound
pressure frequency characteristic of the speaker apparatus which employ | adopted the
diaphragm shown in FIG.7 (C). In FIG. 7E, the cross-sectional shape of the inner peripheral side
diaphragm portion 81 is formed in a substantially linear shape and the cross-sectional shape of
the outer peripheral side diaphragm portion 82 is formed in a substantially linear shape. The
height C of the peripheral edge is larger than the radial length D of the outer peripheral side
diaphragm portion 82, and the outer diameter φB of the diaphragm 8 is 3.2 times the height C
of the outer peripheral edge of the outer peripheral side diaphragm portion 82 FIG. 7F is a view
showing the formed diaphragm, and FIG. 7F is a view showing a simulation result of sound
pressure frequency characteristics of the speaker device adopting the diaphragm shown in FIG.
7E.
[0053]
Next, as shown in FIGS. 7A to 7F, the outer diameter of the diaphragm and the height of the
vibration field were optimized. As shown in FIG. 7A, the cross-sectional shape of the inner
peripheral side diaphragm portion 81 is formed in a substantially linear shape, and the crosssectional shape of the outer peripheral side diaphragm portion 82 is formed in a substantially
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linear shape. The diaphragm whose outer diameter (radius) is 4.8 times the height D8 of the
outer peripheral edge of the diaphragm, as shown in FIG. Although inferior to the diaphragms
shown in FIGS. 5A and 5B, the high frequency band limit frequency is large and the high
frequency band characteristics are improved. On the other hand, as shown in FIGS. 7C and 7E,
vibration in which the outer diameter (radius) of the outer peripheral edge of the diaphragm 8 is
3.8 times the height D8 of the outer peripheral edge of the diaphragm The high frequency
characteristics of the plate and the diaphragm formed 3.2 times have been improved compared
to the other cases. For this reason, for example, the outer diameter (radius) of the outer
peripheral edge of the diaphragm 8 is about 4 times or less of the height D8 of the outer
peripheral edge of the diaphragm, specifically about 3.8 times or less or 3.2 times or less It is
preferable to use the diaphragm 8 of
[0054]
As described above, in the speaker device 100 according to the embodiment of the present
invention, the inner peripheral edge 8A is connected to the voice coil bobbin 6, the outer
peripheral edge 8B is connected to the frame 5 via the edge 9, and the inner peripheral edge 8A
A diaphragm 8 having a top (turned portion 8C) formed between it and the outer peripheral edge
8B and having a shape in which the inner peripheral edge 8A and the outer peripheral edge 8B
are located on the acoustic radiation side compared to the folded portion 8C; The magnetic
circuit 4 for driving the voice coil 7 disposed on the coil bobbin 6 and the outer peripheral edge
10A are connected to the frame 5, and one end on the inner peripheral side is folded back
corresponding to the shape of the folded portion 8C of the diaphragm 8. Since the damper 10 is
formed in the groove-shaped portion 10C and supports the folded portion 8C of the diaphragm
8, the bonding area between the top portion (folded portion 8C) of the diaphragm 8 and the
damper 10 is relatively large. Have Stress on the parts can be reduced.
[0055]
Further, since the diaphragm 8 and the damper 10 have a relatively large bonding area and are
bonded with a relatively large bonding strength, separation of the diaphragm 8 and the damper
10 can be suppressed.
[0056]
Further, in the damper 10, the groove shaped portion 10C is formed apart from the suspension
portion by a prescribed distance, and the diaphragm is supported by the groove shaped portion
10C, so that the dispersion of the acoustic characteristics can be suppressed.
[0057]
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Further, the damper 10 has a flat portion 10L of a prescribed length along the radial direction
between the folded groove portion 10C and the innermost curved portion 10K having a convex
shape or a concave shape on the acoustic radiation side. Since it has, the outer peripheral side
diaphragm part 82 of the diaphragm 8 and the innermost peripheral side curve part 10K can be
made into non-contact, for example, the noise by contact can be suppressed.
[0058]
Also, for example, when manufacturing a general speaker, a jig is required when bonding the
diaphragm to the damper and the frame, but the damper 10 according to the present invention
has the groove shaped portion 10C, The damper 10, the diaphragm 8 and the frame 5 can be
assembled with high accuracy without using a tool.
[0059]
Further, since the damper 10 has the groove shaped portion 10C, the overall height of the
diaphragm 8 can be made relatively large, and the high frequency reproduction limit frequency
can be made large.
[0060]
The present invention is not limited to the embodiments described above.
For example, although the damper 10 is provided with the groove shaped portion 10C at the
inner peripheral end, the shape of the groove shaped portion 10C is not limited to this form.
[0061]
It is a figure for demonstrating the speaker apparatus 100 which concerns on one Embodiment
of this invention.
FIG. 2 is a cross-sectional view of the speaker device 100 shown in FIG. 1 along the line A-A.
(A) is a cross-sectional enlarged view of principal part vicinity of the diaphragm of the speaker
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apparatus 100 shown in FIG. 2, and (B) is a cross-sectional enlarged view of the diaphragm
shown to FIG. 3 (A).
It is sectional drawing for demonstrating the diaphragm of the speaker apparatus 100 shown in
FIG.
(A) is a figure for demonstrating one specific example of the cross-sectional shape of a
diaphragm, (B) is a figure for demonstrating the other specific example of the cross-sectional
shape of a diaphragm, (C) is a vibration It is a figure for demonstrating the cross-sectional shape
of a board in detail.
(A) shows a diaphragm as a comparison target in which the cross-sectional shape of the inner
peripheral side diaphragm portion 81 is formed in a substantially linear shape and the crosssectional shape of the outer peripheral side diaphragm portion 82 is formed in a concave shape
on the sound radiation side It is a sectional view showing, and (B) is a figure showing the
simulation result of the sound pressure frequency characteristic of the speaker apparatus which
adopted the diaphragm shown to (A). (C) is a diaphragm according to the first specific example in
which the cross-sectional shape of the inner peripheral side diaphragm portion 81 is formed in a
convex shape and the cross-sectional shape of the outer peripheral side diaphragm portion 82 is
formed in a convex shape on the acoustic radiation side (D) is a figure which shows the
simulation result of the sound pressure frequency characteristic of the speaker apparatus which
employ | adopted the diaphragm shown to (C). (E) is a cross section showing a diaphragm
according to a second specific example in which the cross sectional shape of the inner peripheral
side diaphragm portion 81 is formed in a convex shape and the cross sectional shape of the outer
peripheral side diaphragm portion 82 is formed in a substantially linear shape. It is a figure and
(F) is a figure showing the simulation result of the sound pressure frequency characteristic of the
speaker apparatus which adopted the diaphragm shown to (E). In (A), the cross-sectional shape of
the inner peripheral side diaphragm portion 81 is formed in a substantially linear shape, and the
cross-sectional shape of the outer peripheral side diaphragm portion 82 is formed in a
substantially linear shape. (A) is a cross-sectional view showing a diaphragm having a length A
longer than the radial length B of the outer peripheral side diaphragm portion 82, and (B) is a
sound pressure of the speaker device adopting the diaphragm shown in (A). It is a figure which
shows the simulation result of a frequency characteristic. In (C), the cross-sectional shape of the
inner peripheral side diaphragm portion 81 is formed in a substantially straight line, and the
cross sectional shape of the outer peripheral side diaphragm portion 82 is formed in a
substantially linear shape. Is a cross-sectional view showing a diaphragm having a length A
substantially equal to the radial length B of the outer peripheral side diaphragm portion 82, and
(D) shows the sound of the speaker device adopting the diaphragm shown in (C). It is a figure
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which shows the simulation result of pressure frequency characteristic. In (E), the cross-sectional
shape of the inner peripheral side diaphragm portion 81 is formed in a substantially linear shape,
and the cross-sectional shape of the outer peripheral side diaphragm portion 82 is formed in a
substantially linear shape. Is a sectional view showing a diaphragm whose length A is shorter
than the radial length B of the outer peripheral side diaphragm portion 82, and (F) is a sound
pressure of the speaker device adopting the diaphragm shown in (E). It is a figure which shows
the simulation result of a frequency characteristic. (A) is the cross-sectional shape of the inner
peripheral side diaphragm portion 81 formed in a substantially linear shape and the cross
sectional shape of the outer peripheral side diaphragm portion 82 is formed in a substantially
linear shape It is a figure which shows the diaphragm in which height C was substantially the
same as the radial direction length of the outer peripheral side diaphragm part 82, or was small,
and the outer diameter B was formed 4.8 times the height C, (B) is It is a figure which shows the
simulation result of the sound pressure frequency characteristic of the speaker apparatus which
employ | adopted the diaphragm shown to (A).
In (C), the cross-sectional shape of the inner peripheral side diaphragm portion 81 is formed in a
substantially straight line and the cross sectional shape of the outer peripheral side diaphragm
portion 82 is formed in a substantially linear shape. It is a figure which shows the diaphragm in
which height C was larger than the length of the radial direction of the outer peripheral side
diaphragm part 82, and the outer diameter B was formed 3.8 times the height C, (D) is (C). It is a
figure which shows the simulation result of the sound pressure frequency characteristic of the
speaker apparatus which employ | adopted the diaphragm shown. In (E), the cross-sectional
shape of the inner peripheral side diaphragm portion 81 is formed in a substantially straight line,
and the cross sectional shape of the outer peripheral side diaphragm portion 82 is formed in a
substantially linear shape. It is a figure which shows the diaphragm in which height C was larger
than the length of the radial direction of the outer peripheral side diaphragm part 82, and the
outer diameter B was formed 3.2 times the height C, (F) is (E). It is a figure which shows the
simulation result of the sound pressure frequency characteristic of the speaker apparatus which
employ | adopted the diaphragm shown.
Explanation of sign
[0062]
DESCRIPTION OF SYMBOLS 1 yoke 2 plate 3 magnet 4 magnetic circuit 5 frame (speaker frame)
6 voice coil bobbin 7 voice coil 8 diaphragm 8C folded part (top part) 9 edge 10 damper 10 C
groove shape part (folded part) 11 center cap 12 lead wire 100 speaker apparatus
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