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DESCRIPTION JP2011004308
To provide a thin speaker device capable of large input. A diaphragm is a flat plate, and a
cylindrical portion positioned outside a magnetic circuit provided inside a frame is integrally
formed on the back surface of the diaphragm. The cylindrical portion was connected to the voice
coil, and radial ribs were integrally formed on the back surface of the flat plate diaphragm at an
outer position of the cylindrical portion to achieve rigidity. The center cap was attached to the
front of the flat diaphragm, which also increased the rigidity of the flat diaphragm. The damper
was provided outside the cylindrical portion so as not to interfere mechanically with the
magnetic circuit. This damper was disposed on substantially the same plane as the substantially
central portion of the voice coil winding portion. In addition, a heat dissipation hole was formed
in the cylindrical portion and the frame to dissipate heat of the voice coil, and a window was
formed to improve heat dissipation. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a thin speaker device used for, for example, various AV devices
and the like.
[0002]
FIG. 7 shows a speaker device generally used conventionally.
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1
In the figure, reference numeral 100 denotes an inner magnet type magnetic circuit, which
comprises a yoke 101, a magnet 102 and a plate 103, and a magnetic gap is formed between the
outer peripheral surface of the plate 103 and the yoke inner peripheral wall 101a opposed
thereto.
[0003]
The voice coil winding portion 104 a of the voice coil 104 is located in the magnetic gap.
[0004]
The inner periphery of the damper 105 is bonded to the upper outer periphery of the voice coil
104, and the outer periphery of the damper 105 is bonded to the step 106a of the frame 106.
The lower part of the frame 106 is joined on the top surface 101b of the yoke upper part, and
the outer peripheral part of the edge 107 is bonded to the upper part of the frame 106, and the
outer peripheral part of the conical diaphragm 108 is bonded to the inner peripheral part of the
edge 107 The inner peripheral side of the diaphragm 108 is bonded to the upper outer
peripheral portion of the voice coil 104. Reference numeral 109 denotes a center cap provided at
the center of the diaphragm 108.
[0005]
In operation, when an audio signal is input to the voice coil winding portion 104 a in the
magnetic gap, the voice coil 104 vibrates and, consequently, the diaphragm 108 vibrates. At this
time, the damper 105 also vibrates.
[0006]
In this case, sufficient between the damper 105 and the yoke upper surface of the magnetic
circuit 100 to avoid mechanical interference that the damper 105 may come in contact with the
upper surface of the top surface 101b of the yoke 101 or the lower part of the frame at large
input. Since it is necessary to provide the clearance a, this has been an obstacle to thinning.
[0007]
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FIG. 8 shows a conventional example of a speaker of the type in which the magnetic circuit is
provided in front of the diaphragm, and such a speaker device is disclosed in JP-A-62-136196.
[0008]
In this speaker device, a magnetic circuit 201 is disposed in front of a cone-shaped diaphragm
200.
The inner periphery of the diaphragm 200 is bonded to the lower portion of the voice coil 202,
and the voice coil winding portion 202a located in the magnetic gap is disposed above the voice
coil 202, and the voice coil 202 is disposed below the diaphragm 200. It is vibratably supported
via the provided damper 203.
[0009]
In this speaker device, it is necessary to secure a distance b between the diaphragm 200 and the
lower portion of the yoke 204 of the magnetic circuit 201.
[0010]
FIG. 9 shows a conventional speaker device in which the inner diameter of the diaphragm 300 is
larger than that of the magnetic circuit 301 and the position of the damper 302 is substantially
equal to the position of the upper portion of the yoke 303 of the magnetic circuit 301. Opening
2002-271893 is mentioned.
[0011]
That is, the magnetic circuit 301 is provided at the center of the bottom of the frame 304, and
the damper 302 is positioned at substantially the center of the frame 304.
The damper 302 is positioned outside the yoke of the magnetic circuit 301, the inner peripheral
portion of the damper 302 and the neck portion of the conical diaphragm 300 are bonded to the
lower portion of the outer periphery of the connecting portion 305, and the inner peripheral
portion of the connecting portion 305 is a voice. A voice coil winding portion 306 a is provided
on the lower outer periphery side of the voice coil 306 and is adhered to the upper portion of the
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coil 306.
[0012]
FIG. 10 also shows another conventional example of the speaker apparatus in which the position
of the damper 400 is substantially the same position as the upper portion of the yoke 402 of the
magnetic circuit 401. As this speaker apparatus, JP-A-2005-269328 can be mentioned.
[0013]
The diaphragm 403 of the speaker device has a substantially flat plate shape, but a falling
portion 403 a is formed on the inner peripheral portion thereof and is bonded to the upper outer
peripheral portion of the voice coil 404.
[0014]
The connection portion 405 provided between the damper 400 and the voice coil 404 is located
below the diaphragm 403, and the inner periphery of the connection portion 405 is bonded to
the upper outer periphery of the voice coil 404, and the outer periphery of the connection
portion 405 Is located on the upper side of the yoke 402, and the inner peripheral portion of the
damper 400 is bonded.
[0015]
JP-A-62-136196 JP-A-2002-271893 JP-A-2005-269328
[0016]
The general speaker device shown in FIG. 7 has a limitation in thinning since it is necessary to
take a clearance a between the damper 105 and the upper surface of the yoke inner peripheral
wall 101a of the magnetic circuit 100 disposed below and spaced therefrom. There was a
problem that there was.
[0017]
Also in the speaker apparatus of the type in which the magnetic circuit shown in FIG. 8 is
provided in front of the diaphragm, the distance b between the damper 203 and the magnetic
circuit 201 is large, and the damper 203 serves to maintain the voice coil winding portion 202a
at the center. , And rolling defects are likely to occur, and it is necessary to widen the magnetic
gap.
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[0018]
In the speaker apparatus of the type in which the diaphragm 300 having a larger inside diameter
than the magnetic circuit 301 shown in FIG. 9 is used and the damper 302 supporting the
diaphragm 300 is disposed above the magnetic circuit 301, Since the connection portion 305 is
provided between the voice coil 306 and the voice coil 306 inside the connection portion 305,
there is a problem that the heat dissipation path can not be secured by the connection portion
305, and the input can not be large.
[0019]
In the conventional example of FIG. 10, the falling portion 403a is formed on the inner
peripheral portion of the diaphragm 403, and the portion is bonded to the upper outer
peripheral portion of the voice coil 404, and the connecting portion 405 is also bonded. In the
case of the substantially flat diaphragm 403, sufficient shape rigidity can not be obtained, and
there is a problem that it is difficult to obtain a large input.
[0020]
The present invention has been proposed to solve the above problems, and the shape rigidity of
the diaphragm is enhanced, and the arrangement of the dampers is at a position not to cause
mechanical interference with the magnetic circuit, thereby making it thin while coping with a
large input. The present invention is to provide a speaker device capable of achieving a large
input and capable of improving the efficiency of the magnetic circuit and having a good heat
dissipation because the gap length of the magnetic circuit can be made small. The purpose of
[0021]
In the first aspect of the present invention, the cylindrical portion 9b is integrally formed on the
back surface 9a of the flat plate diaphragm 9 in which the central hole 9c is formed, and the rib
9d radially extends toward the outer peripheral portion on the outside of the cylindrical portion
9b. The magnetic circuit 2 is integrally formed at an inner position of the cylindrical portion 9b
at the center of the inner bottom of the frame 1, and above the voice coil 8 where the voice coil
winding portion 8a is located in the magnetic gap of the magnetic circuit 2. The inner peripheral
portion of the flat plate diaphragm 9 is adhered to the outer peripheral portion, and is fitted into
the tip end portion of the voice coil 8 projecting from the central hole 9 c to form a flat center
cap 11 on the front surface of the flat plate diaphragm 9. The voice is attached via the cylindrical
portion 9b by the damper 12 disposed outside the cylindrical portion 9b of the flat plate
diaphragm 9 so that the inner diameter is larger than the magnetic circuit 2 and does not
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mechanically interfere with the magnetic circuit 2. The cylindrical portion 9b is provided with a
vent hole 9e for radiating heat generated by the voice coil 8 to the outside, and a heat dissipation
window for forming a heat dissipation path A together with the vent hole 9e. 7 is formed on the
frame 1.
According to a second aspect of the present invention, in the speaker device according to the first
aspect, a plurality of the ribs 9d are formed on the outer side of the cylindrical portion 9b with
an interval, and the vent holes 9e are formed between the ribs 9d. It features.
The invention according to claim 3 is characterized in that in the speaker device according to
claim 1, a flat plate 15 is provided on the front surface 9 h of the flat diaphragm 9.
[0022]
In the present invention, since the damper 12 is disposed outside the magnetic circuit 2 so that
the damper 12 and the magnetic circuit 2 do not mechanically interfere with each other, there is
no need to secure a clearance between the damper 12 and the magnetic circuit 2 Can be
Since ribs 9d are formed at appropriate intervals on the back surface 9a of the flat diaphragm 9
and the shape rigidity of the entire surface of the diaphragm can be secured by the center cap
11, large input can be achieved.
Further, the cylindrical portion 9b formed on the back surface of the flat diaphragm 9 is disposed
outside the magnetic circuit 2, and the cylindrical portion 9b is formed with a vent 9e for
dissipating heat from the voice coil 8 placed in the magnetic circuit 2. At the same time, the heat
release window 7 corresponding to the vent hole 9e is formed in the frame 1 for supporting the
flat diaphragm 9, and the first heat release path A from the vent hole 9e to the heat release
window 7 is formed. Also from this point of view, a large input can be achieved.
The heat release windows A and B also correspond to the pressure change inside the speaker
device due to the change of the amplitude of the flat diaphragm 9.
Further, since the damper 12 and the voice coil winding portion 8a are arranged substantially on
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the same plane when the damper 12 is at rest, coil touch due to rolling is hard to occur, so the
gap length Lg can be shortened. And the magnetic flux density can also be improved.
[0023]
The longitudinal cross-sectional view of 1st Example of this invention.
(A) The perspective view which looked at the diaphragm used by this invention from the front
side, (b) The perspective view which looked at the diaphragm same as the same from the back
side.
Partial-section explanatory drawing of the magnetic circuit of this invention.
Assembly explanatory drawing of 1st Example of this invention.
Explanatory drawing of the completion state of the assembly same as the above.
The longitudinal cross-sectional view of 2nd Example of this invention. The longitudinal crosssectional view of the conventional general speaker apparatus. The longitudinal cross-sectional
view of the conventional speaker apparatus of the type in which the magnetic circuit was
provided ahead of the diaphragm. The longitudinal cross-sectional view of the speaker apparatus
of another prior art example. The longitudinal cross-sectional view of the speaker apparatus of
another prior art example is shown.
[0024]
In the present invention, the damper is provided at a position not mechanically interfering with
the magnetic circuit, that is, outside the magnetic circuit, and the damper and the voice coil
winding portion placed in the magnetic gap of the magnetic circuit are disposed substantially on
the same plane. did. Radial ribs were provided on the back of the flat diaphragm driven by the
voice coil, and a center cap was attached to improve the shape rigidity of the flat diaphragm. In
addition, a heat dissipation path for heat generation of the voice coil to be dissipated to the
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outside was formed quickly, and the position of the damper and the shape rigidity of the flat
diaphragm were improved, and the heat dissipation was good, achieving thinning and large input.
[0025]
FIG. 1 shows a first embodiment of a speaker device according to the present invention.
[0026]
A magnetic circuit 2 is provided on the lower surface 1 a in the frame 1.
A cylindrical first peripheral wall 1b is formed on the outer periphery of the lower surface 1a of
the frame 1 and is formed to rise upward, and the upper portion of the first peripheral wall 1b is
bent outward and has a stepped shape for mounting a damper A stepped portion 1c is formed, an
outer peripheral portion of the stepped portion 1c is raised, and a second peripheral wall 1d is
formed, and an upper end thereof is an edge attaching portion 1e bent outward. A first heat
radiation window 6 for heat radiation is formed from the outer peripheral portion of the lower
surface 1a to the first peripheral wall 1b. Further, the second heat radiation window 7 for heat
radiation is also formed from the outer peripheral side of the step portion 1c for mounting the
damper to the second peripheral wall 1d.
[0027]
The magnetic circuit 2 includes a cylindrical yoke 3 with a bottom, a magnet 4 provided inside
the yoke 3, and a plate 5 provided on the top of the magnet 4, and the outer peripheral surface
of the plate and the yoke peripheral wall 3a opposed thereto A magnetic gap g is formed on the
inner circumferential surface of
[0028]
The voice coil winding portion 8a is disposed in the magnetic gap g.
The inner peripheral surface of the flat diaphragm 9 is bonded to the upper outer peripheral
surface of the voice coil 8. One end of an edge 10 is bonded to the outer peripheral portion of the
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back surface 9 a of the flat diaphragm 9, and the other end of the edge 10 is bonded to an edge
attaching portion 1 e of the frame 1. A flat plate-shaped center cap 11 is provided on the central
hole 9 c of the flat plate diaphragm 9 and on the outer peripheral portion thereof on the flat
plate front surface 9 h. The outer diameter of the center cap 11 is equal to or slightly larger than
the inner diameter of the damper 12. When the outer diameter of the center cap 11 is larger
than the inner diameter of the damper 12, the drivability can be improved. That is, since the
portion of the flat diaphragm 9 inside the inner diameter (≒ diameter of the cylindrical portion
9b) of the damper 12 is not reinforced by the rib 9d, the strength is weak and it is easy to bend
particularly in the vicinity of the hole 9f. The strength of the cap 11 compensates. Thus, the
drivability is improved. A step is formed on the back of the center cap 11 to be fitted on the outer
periphery of the tip of the voice coil 8 protruding upward from the central hole 9c of the flat
diaphragm 9, and the voice coil tip protruding from this standing portion The center cap 11 is
fitted and positioned and attached to the front surface 9 h of the flat plate diaphragm, and this
portion is adhered as described later to secure the adhesive strength and to prevent the neck loss
at the time of large input.
[0029]
On the back surface 9a of the flat diaphragm 9, a cylindrical portion 9b located outside the yoke
peripheral wall 3a is formed. The lower portion of the cylindrical portion 9b is divided from the
viewpoint of assemblability. This will be explained later. From the outer peripheral surface of the
cylindrical portion 9b to the back surface 9a of the flat plate diaphragm 9, the longitudinal cross
section has a substantially right-angled triangle shape, and ribs 9d extending radially outward
from the inner part of the flat plate diaphragm 9 are formed. The top of the flat plate is located
on the outer peripheral side of the flat plate back surface 9a. In the figure, 9f is a hole formed in
the portion of the cylindrical portion 9b of the flat diaphragm 9. This hole 9f may not be present.
The holes 9f are provided for manufacturing reasons. That is, in the case of injection molding
with a mold, if there is no hole 9f, it becomes an undercut and it is necessary to provide a slide in
the mold, and the mold structure becomes complicated, so that the cost for forming becomes
high and the life becomes short. There are holes 9f for such manufacturing reasons.
[0030]
Further, the cylindrical portion 9b is formed with a vent hole 9e for releasing the heat generation
of the voice coil 8 to the outside.
[0031]
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9
FIG. 2A is a perspective view of the front surface side of the flat plate diaphragm 9 having a
substantially circular outer shape, and at the upper end portion of the cylindrical portion 9b, the
above-mentioned Holes 9f are formed.
FIG. 2B is a perspective view of the flat diaphragm 9 as viewed from the back side. Depending on
the size of the flat diaphragm 9, 6 to 20, preferably 16 ribs 9d are formed at equal intervals
along the circumferential direction. If the number of ribs 9d is 6 or less, the strength is
insufficient, and if it is 20 or more, the weight increases. These ribs 9d, together with the center
cap 11, improve the shape rigidity of the entire surface of the flat diaphragm 9, and play a role of
large input. Further, vent holes 9e are respectively formed between the rib 9d and the rib 9d
formed in the cylindrical portion 9b. The hole 9 f is closed by the center cap 11. This is to
prevent air noise due to a pressure change on the rear side of the speaker and to suppress a
reduction in strength due to the hole 9 f.
[0032]
Referring again to FIG. 1, a damper mounting portion 9 g is formed on the lower outer peripheral
portion of the cylindrical portion 9 b formed on the back surface 9 a of the flat plate diaphragm
9, and the inner peripheral portion of the damper 12 is mounted. The outer peripheral portion of
the damper 12 is attached to a damper mounting step 1 c formed on the frame 1.
[0033]
The damper 12 is positioned approximately at the center of the voice coil winding portion 8a
when the voice coil 8 is at rest, ie before vibration. In other words, the substantially central
portions of the damper 12 and the voice coil winding portion 8a are disposed on substantially
the same plane. That is, the damper mounting portion 9g and the upper surface of the step
portion 1c are provided at substantially the same position and at the outer position of the upper
outer periphery of the yoke, and the damper 12 is outside the magnetic circuit 2 and the
magnetic circuit is vibrated. The first space portion 13 and the second space portion 14 are
formed on the front and rear surfaces of the damper 12 to ensure maximum amplitude.
[0034]
By arranging the damper 12 in this manner, the speaker device can be thinned.
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[0035]
Further, by arranging the damper 12 and the substantially central portion of the voice coil
winding portion 8a on substantially the same plane, it is difficult to generate a coil touch due to
rolling, so the gap length Lg shown in FIG. 3 can be reduced. And the magnetic flux density can
also be improved.
[0036]
When the voice coil is driven, the heat generation of the voice coil 8 can be quickly dissipated to
the outside air of the back side of the speaker device through the vent hole 9e formed in the
cylindrical portion 9b and the second heat release window 7.
A is its first heat radiation path.
In this case, heat is also dissipated through the first heat dissipation window 6. B is the second
heat radiation path. When the first and second heat radiation paths A and B are formed as
described above, the heat radiation property is further improved. Further, the heat in the voice
coil 8 can be dissipated to the outside through the heat dissipation hole 8b formed in the voice
coil 8, the vent hole 9e of the cylindrical portion 9b, the second heat dissipation window 7 and
the like.
[0037]
FIG. 4 shows a second embodiment of the present invention. This embodiment is different from
the first embodiment in that a thin flat plate 15 for increasing rigidity is attached to the front
surface of the flat plate diaphragm 9 to further improve the shape rigidity. Other configurations
and effects are similar.
[0038]
In assembly, as shown in FIG. 4, the magnetic circuit 2 is attached to the frame 1 via the jig A.
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Thereafter, the jig A is removed.
[0039]
Also, using a jig (not shown), the voice coil 8 is disposed at an appropriate position in the
magnetic gap g.
[0040]
The lower portion 9b 'of the cylindrical portion 9b of the flat plate diaphragm 9 is initially
separated in consideration of assemblability.
[0041]
The inner peripheral portion of the damper 12 is attached to the outer peripheral step portion
(damper inner peripheral mounting portion) of the substantially cylindrical lower portion 9 b ′
separated, and the outer peripheral portion of the damper 12 is attached to the damper
mounting step portion 1 c of the frame 1 Be glued.
[0042]
Further, an adhesive (not shown) is applied to the upper surface 9 b ′ ′ of the lower portion 9
b ′ separated, and as shown in FIG. 5, it is adhered to the lower surface of the cylindrical
portion 9 b on the flat diaphragm 9 side.
[0043]
Further, the outer peripheral portion of the voice coil 8 is bonded to the inner peripheral portion
of the flat diaphragm 9.
[0044]
Since the inner peripheral portion of the edge 10 is bonded to the outer peripheral portion of the
flat diaphragm 9, the outer peripheral portion of the edge 10 is bonded to the edge mounting
portion 1 e of the frame 1.
[0045]
Next, the center cap 11 is placed on and bonded to the substantially central portion of the front
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surface of the flat diaphragm 9.
In this case, the upper outer peripheral portion of the voice coil 8 projecting forward from the
upper surface of the flat plate diaphragm 9 is bonded to the inner peripheral surface of the step
11 a on the inner surface of the center cap 11.
If the rib-like cylindrical portion 9b is provided on the inner side of the inner diameter of the
damper on the back surface side of the flat plate diaphragm 9 to interfere with the magnetic
circuit 2, the height dimension can not be obtained. Since there is a height dimension which is
wasted because of the protrusion of the upper part of the upper part, the step part 11b is formed
on the back of the flat plate diaphragm 9 by effectively using that part, and it adheres to the
voice coil 8 And, it is considered as a countermeasure against the head loss at the time of large
input.
[0046]
DESCRIPTION OF SYMBOLS 1 frame 1a lower surface 1b first peripheral wall 1c stepped portion
1d second peripheral wall 1e edge mounting portion 2 magnetic circuit 3 yoke 3a yoke
peripheral wall 4 magnet 5 plate 6 first heat dissipation window 7 second heat dissipation
window 8 voice coil 8a voice Coil winding 9 flat plate diaphragm 9a flat plate diaphragm back 9b
cylindrical portion 9c central hole 9d rib 9e air vent 9f hole 9g damper mounting portion 9h flat
plate diaphragm front 10 edge 11 center cap 12 damper 13 first space portion 14 Space part of
2
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13

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