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JP2010219922

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DESCRIPTION JP2010219922
An object of the present invention is to make a speaker device thinner while preventing heat
generation of a drive system from adversely affecting a diaphragm. A speaker device (1) for
vibrating a flat diaphragm (2) to emit sound toward the front side of the diaphragm (4) is
mounted on the back side of the diaphragm (2) to hold the diaphragm (2). The drive coil 7 has a
frame 5, a permanent magnet 6 mounted on the back side of the diaphragm 2 to form a magnetic
circuit, and a drive coil 7 that reciprocates in a direction in which the magnetic circuit is moved.
Is characterized in that it is mounted on the side opposite to the diaphragm 4 in the frame 5 so
as to have a clearance along the direction of contact and separation with the permanent magnet
6. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
In recent years, a panel-type speaker device that vibrates a panel capable of projecting an image
and generates a sound from the panel has been put into practical use.
Such panel-type speaker devices are required to be large in size for projecting an image. Along
with this, there is also a demand for thinning the speaker devices.
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1
[0003]
Conventionally, a voice coil is disposed at the center of a panel, and a driver is disposed on a
support that supports the panel, and the voice coil is driven by the driver to emit sound from the
front of the screen. Device is present. As such a type of speaker device, for example, one
disclosed in Patent Document 1 is known.
[0004]
Unexamined-Japanese-Patent No. 2006-319626 (summary)
[0005]
The speaker device disclosed in Patent Document 1 vibrates a voice coil by the driving force of a
driving body disposed on a support, and emits sound from the front of the panel.
The driving body used in this speaker device is composed of a yoke and a magnet, and has a
relatively large thickness dimension. In addition, since the voice coil also has a thickness
dimension corresponding to the driving body, there is a limit to thinning the speaker device
having the configuration. Also, since the voice coil is attached to the back of the panel, the heat
generation of the voice coil may adversely affect the diaphragm.
[0006]
The present invention has been made in view of such problems, and an object of the present
invention is to provide a speaker device which can be thinned while preventing heat generation
of the drive system from adversely affecting the diaphragm. It is intended to be provided.
[0007]
In order to solve the above problems, one aspect of the present invention is a speaker device that
vibrates a flat diaphragm to emit sound toward the front side of the diaphragm, in order to hold
the diaphragm, the diaphragm A frame mounted on the back side opposite to the front side, a
permanent magnet mounted on the back side of the diaphragm and forming a magnetic circuit,
and a drive coil reciprocating in a direction in which the magnetic circuit is moved. The drive coil
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is mounted on the side of the frame opposite to the diaphragm so as to have a clearance along
the direction of contact and separation with the permanent magnet.
[0008]
In addition, the driving coil is preferably wound in a spiral shape so as to have a flat form along
the radial direction with respect to the central axis of the driving coil.
[0009]
In addition, it is preferable to wind the driving coil in alpha winding in which both ends of the
wire are drawn from the outer peripheral side.
[0010]
Further, it is preferable that at least two or more of the spirally wound portions of the driving coil
be formed using one wire.
[0011]
In addition, the driving coil preferably has a rectangular shape having R at four corners.
[0012]
Further, it is preferable to dispose a plurality of permanent magnets which are magnetized in a
direction parallel to a plane orthogonal to the central axis of the drive coil.
[0013]
Further, it is preferable to magnetize the permanent magnet along the radial direction of the
drive coil.
[0014]
In addition, it is preferable to interpose a member for buffering the vibration of the vibrating
plate between the vibrating plate and the frame, or to apply a liquid for buffering the vibration of
the vibrating plate to the vibrating plate or the frame.
[0015]
Preferably, the magnetic fluid is injected into one or both of the surface of the permanent magnet
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facing the frame and the surface of the drive coil facing the diaphragm.
[0016]
According to the present invention, it is possible to make the speaker device thinner while
preventing the heat generation of the drive system from adversely affecting the diaphragm.
[0017]
FIG. 1 is an exploded perspective view of a speaker device according to an embodiment of the
present invention.
It is a perspective view of the speaker apparatus concerning one embodiment of the present
invention.
It is a front view of the speaker apparatus concerning one embodiment of the present invention.
It is a front view of the vibrating body in FIG.
It is a front view which shows the state which has arrange ¦ positioned the flat coil in the flame ¦
frame in FIG.
It is a top view of the flat coil in FIG.
It is a sectional side view of the speaker apparatus concerning one embodiment of the present
invention.
It is a front view showing a state where a panel is attached to a jig and a constant tension is
applied to the panel.
A fixed tension is applied to a panel with a jig ¦ tool, and it is the elements on larger scale which
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show the state which has arrange ¦ positioned the spacer on the back side of this panel.
[0018]
Hereinafter, a speaker device 1 according to an embodiment of the present invention will be
described with reference to the drawings.
In the following description, the arrow X1 direction shown in FIGS. 1 to 5 and FIG. 7 is front, the
arrow X2 direction is reverse, the arrow Y1 direction is left, the arrow Y2 direction is right, and
the arrow Z1 direction is The upper and arrow Z2 directions are respectively defined as lower.
[0019]
FIG. 1 is an exploded perspective view of a speaker device 1 according to an embodiment of the
present invention.
FIG. 2 is a perspective view of the speaker device 1 according to an embodiment of the present
invention.
FIG. 3 is a front view of the speaker device 1 according to the embodiment of the present
invention. FIG. 4 is a front view of the vibrator 4 in FIG. FIG. 5 is a front view showing the flat coil
7 disposed on the frame 5 in FIG.
[0020]
The speaker device 1 is a panel type speaker device that vibrates a thin panel 2 to emit sound,
and as shown in FIGS. 1 and 2, the vibration in which the back side of the panel 2 serving as a
diaphragm is held by a spacer 3 The frame 4 is disposed on the back side of the body 4 and the
vibrating body 4 and supports the vibrating body 4. The four magnets 6 serving as permanent
magnets mounted on the back side of the panel 2 It mainly comprises the flat coil 7 which
becomes a coil for driving movement. The speaker device 1 has, for example, an outer dimension
having a width (length in the left-right direction) and a height (length in the up-down direction)
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of 80 mm and a thickness (length in the front-back direction) of about 2.5 mm.
[0021]
As described above, the vibrating body 4 is configured of the panel 2 and the spacer 3. The panel
2 is a thin-walled panel having a substantially square shape in a plane, as shown in FIGS. 1 and 4
and the like. In the present embodiment, for example, a polyimide film having an outer dimension
of 80 mm in width and height and about 50 μm in thickness is used as the panel 2. In addition,
the material of the panel 2 is not limited to a polyimide film, For example, you may use other
materials, such as an electroluminescence.
[0022]
As shown in FIG. 1 and FIG. 4 etc., the panel 2 is attached to the front side of the spacer 3 so that
the outer peripheral surface thereof matches the outer peripheral surface of the spacer 3. The
panel 2 is attached to the front side of the spacer 3 in a state where a constant tension is applied
from its central portion to its outer edge. Specifically, the panel 2 is attached to the spacer 3 in a
state of applying tension by using a jig 30 described later and extending outward. The panel 2 is
fixed to the spacer 3 with an adhesive interposed between the panel 2 and the spacer 3.
[0023]
As shown in FIG. 1 and FIG. 4 etc., the spacer 3 has a square frame shape. The length of each side
of the spacer 3 is, for example, 80 mm so as to match the outside dimension of the panel 2. The
dimensions of the frame width B (see FIG. 4) and thickness of the spacer 3 are, for example, 7.2
mm and 2 mm, respectively. In the present embodiment, stainless steel is used as the material of
the spacer 3. However, the material of the spacer 3 is not limited to stainless steel, and other
materials such as iron and aluminum may be used, for example.
[0024]
As shown in FIGS. 1 to 3, a magnet 6 is disposed on the back side of the vibrating body 4. The
magnet 6 is mounted substantially at the center of the back surface of the panel 2. As shown in
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FIG. 3, each of the magnets 6 has a substantially trapezoidal shape in a front view, and is
magnetized so that the short side is an N pole and the long side is an S pole. Further, as shown in
FIG. 3, a total of four magnets 6 are disposed vertically and horizontally and in the left and right
so that the short sides of the respective magnets 6 face each other. Specifically, the magnets 6
are disposed so as to face the center at the four points in the upper, lower, left, and right
directions such that a substantially square space is formed at the center. The magnet 6 has, for
example, an outer dimension having a short side length C of 8 mm, a long side length D of 16
mm, a width E between the long side and the short side of 11 mm, and a thickness of 1 mm (see
FIG. 3). ).
[0025]
The magnet 6 is positioned with respect to the inner peripheral surface of the spacer 3 and fixed
to the panel 2 by interposing a two-component mixed acrylic adhesive between the panel 2 and
the magnet 6. Further, in the present embodiment, a neodymium magnet is used as the magnet,
but another magnet may be used.
[0026]
As shown in FIG. 1, the frame 5 is disposed on the back side of the vibrating body 4. As shown in
FIGS. 1 and 5, the frame 5 has a substantially square form in a front view, and a ring-shaped
recess which is recessed toward the back side in the form of a square ring at its central portion
10 are provided. Further, on the inner peripheral side of the ring-shaped concave portion 10, a
convex portion 11 protruding toward the front side is formed. The outer peripheral surface 13 of
the ring-shaped recess 10 and the outer peripheral surface of the protrusion 11 (the inner
peripheral surface of the ring-shaped recess 10) 14 have a substantially square shape.
Specifically, for example, a chamfering process of R 6 mm is applied to the four corners of the
inner peripheral surface 13 of the ring-shaped recess 10, and a chamfering process of C 1 mm is
applied to the four corners of the outer peripheral surface 14 of the protrusion 11. ing. The outer
dimensions of the frame 5 are, for example, 80 mm in width and height, and 1 mm in thickness F
(see FIG. 1). In addition, the dimension of the ring-shaped recess 10 depth G is, for example, 0.5
mm, and the dimensions of the width H1 and the height H2 of the outer edge thereof are, for
example, 32 mm respectively, the width J1 of the inner edge and the height The dimensions of J2
are, for example, each 9.95 mm (see FIG. 1).
[0027]
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The outer edge of the frame 5 is formed one step lower than the plane 15 of the frame 5. That is,
the frame 5 has the lower plate portion 16 which is one step lower in the form of a square frame
at the outer edge portion. Therefore, the convex plate portion 17 formed one step higher than
the outer edge portion is formed at the center side of the frame 5. As shown in FIGS. 1 and 5, the
convex plate portion 17 is provided with two slits 18 which are cut in a groove shape from the
ring-shaped concave portion 10 to the low plate portion 16. Specifically, two slits 18 are
provided side by side in the left and right direction in the lower region of the convex plate
portion 17 along the vertical direction. The bottom surface of the ring-shaped recess 10, the
surface of the lower plate portion 16, and the bottom surface of the slit 18 are formed to be flush
with each other. In addition, circular adjustment holes 19 are provided at four places in the top,
bottom, left, and right of the convex plate portion 17. The dimensions of the height K of the
convex plate portion 17 and the frame width L of the low plate portion 16 are, for example, 0.5
mm and 7.225 mm, respectively (see FIG. 1). Therefore, the dimension of the width M of the
convex plate portion 17 is, for example, 65.55 mm (see FIG. 1). In the present embodiment, a
cloth-containing phenol resin called a bake plate is used as the material of the frame 5. The
material of the frame 5 is not limited to a cloth-containing phenolic resin, and other materials
such as aluminum, iron or stainless steel may be used, and the surface may be subjected to an
alumite treatment. good.
[0028]
FIG. 6 is a plan view of the flat coil 7 in FIG.
[0029]
As shown in FIG. 1, FIG. 5 and FIG. 6 etc., the flat coil 7 in a flat form is disposed in the ringshaped recess 10 along the direction (radial direction) orthogonal to the X1-X2 axis.
As shown in FIG. 1, the flat coil 7 is configured by winding a conductive round wire covered with
an insulating film such as enamel over two layers in an alpha winding. As a material of this round
wire, although the metal excellent in conductivity like copper is preferable, it is good also as
metals, such as stainless steel, iron, or aluminum. In the present embodiment, the diameter
dimension which is the entire length of the round wire is, for example, 0.25 mm, and the
diameter dimension of the conductor portion excluding the insulating film and the adhesive layer
is, for example, 0.19 mm. It has become.
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[0030]
The flat coil 7 is wound clockwise from one end 7a to the inside, and when it is wound to some
extent, the other end 7b is moved to the upper layer, and is wound clockwise from the inside to
the outside. Turn. Then, the terminal 7a is pulled out from the outer periphery of the lower layer
winding portion, and the terminal 7b is pulled out from the outer periphery of the upper layer
winding portion. As shown in FIGS. 1, 5 and 6 etc., the terminals 7 a and 7 b are both drawn
downward from the outer peripheral portion of the flat coil 7. The terminals 7a and 7b are not
covered with the insulating film, and are in a state capable of conducting electricity to the
outside. In the present embodiment, the terminal 7a is used as a positive terminal, and the
terminal 7b is used as a negative terminal.
[0031]
As shown in FIG. 6, the flat coil 7 has a substantially square ring shape when viewed from the
front. For this reason, the flat coil 7 has the rectangular part 20 which has a substantially
rectangular form in four places of the upper and lower sides and right and left. Further, at the
central portion of the flat coil 7, an air core portion 21 penetrating in the front and rear direction
in a substantially square form is formed. The external shape of the flat coil 7 and the air core
portion 21 has a square shape having R at four corner portions. The air core portion 21 has a
substantially square outer shape with a side length of, for example, 10 mm, and the flat coil 7 has
a substantially square outer shape with a side length of, for example, 30 mm. The flat coil 7 has a
thickness of, for example, 0.5 mm. Furthermore, the flat coil 7 is wound with, for example, about
80 turns, and the DC resistance is formed to be, for example, about 3.1 Ω. The flat coil 7 is
preferably wound, for example, 40 turns at each layer. Further, the number of turns of the flat
coil 7 is not limited to 80 turns.
[0032]
As shown in FIGS. 1 and 5, the flat coil 7 to be an air core coil is disposed in the ring-shaped
concave portion 10 so that the air core portion 21 is inserted into the convex portion 11. Both
terminals 7 a and 7 b are pulled out of the frame 5 through the slits 18. The flat coil 7 is fixed to
the ring-shaped recess 10 by interposing a two-component mixed acrylic adhesive between the
back surface and the bottom surface of the ring-shaped recess 10.
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[0033]
The speaker device 1 is configured by attaching the vibrating body 4 to which the magnet 6 is
mounted to the front side of the frame 5 on which the flat coil 7 is disposed. Specifically, the
vibrating body 4 is attached to the front side of the frame 5 so that the convex plate portion 17 is
accommodated in the frame of the spacer 3. At this time, the vibrator 4 is fixed to the frame 5 by
adhering the back surface of the spacer 3 and the low plate portion 16 with an adhesive sheet.
Here, as shown in FIG. 3 etc., the magnet 6 is magnetized so that the short side is the N pole and
the long side is the S pole, so the flow of magnetism is independent of the front and back of the
magnet, It is generated to flow outward from the central part of the four arranged magnet
groups. The magnetic flow (magnetic circuit) and the current flowing through the flat coil 7 act
to vibrate the panel 2.
[0034]
FIG. 7 is a side sectional view of the speaker device 1 according to the embodiment of the present
invention.
[0035]
As shown in FIG. 7, each magnet 6 has a clearance N with the flat coil 7.
Further, as shown in FIG. 3, the magnet 6 is disposed to face the rectangular portion 20 of the
flat coil 7. At this time, a current flows in a direction substantially orthogonal to the magnetic
circuit generated in the magnet 6, and a larger force acts between the magnet 6 and the flat coil
7. Further, the heat of the flat coil 7 is less likely to be transmitted to the panel 2 due to the
presence of the clearance N described above.
[0036]
Next, a method of manufacturing the speaker device 1 will be described.
[0037]
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FIG. 8 is a front view showing a state in which the panel 2 is attached to the jig 30 and a constant
tension is applied to the panel 2.
FIG. 9 is a partially enlarged view showing a state in which a constant tension is applied to the
panel 2 by the jig 30 and the spacer 3 is disposed on the back side of the panel 2.
[0038]
First, the jig 30 is prepared. As shown in FIG. 8, the jig 30 has a square frame-shaped outer frame
31, four clamp members 32 arranged in a square frame shape inside the outer frame 31, and a
clamp member penetrating the outer frame 31. 32 and a tensioning screw 33 which is recessed
from the lateral direction. The clamp members 32 have a substantially elongated trapezoidal
shape, and in the vicinity of the inner peripheral portion (short side portion of the trapezoid) of
each clamp member 32, the clamp members 32 are cut from the inner peripheral surface of the
clamp member 32 toward the outer peripheral side. The illustrated gap is formed. Since the four
clamp members 32 are arranged in a square frame, a window 34 having a substantially square
shape is formed on the inside thereof.
[0039]
Next, a panel 2 whose outer shape is slightly larger than that of the window portion 34 is
prepared, and the panel 2 is disposed inside the window portion 34. The panel 2 is disposed in
the window 34 in such a manner that its outer edge is inserted into a gap (not shown). In this
state, clamp screws 35 attached to each clamp member 32 are tightened. Then, the panel 2 is
fixed to the clamp member 32 while being disposed inside the window 34. Next, the tension
screw 33 is tightened to move the clamp members 32 outward in the vertical and horizontal
directions. Then, as the clamp member 32 moves, the panel 2 is pulled vertically and
horizontally. That is, tension is applied to the panel 2 and the flatness is maintained. Next, in a
state where the adhesive is applied to the surface of the spacer 3, the spacer 3 is disposed in the
window 34 on the front side of the paper surface in FIG. 8 (see FIG. 9). Thereafter, the spacer 3 is
pressed toward the panel 2, and when the panel 2 is adhered to the spacer 3, the clamp screw 35
is loosened. Then, the spacer 3 to which the panel 2 is attached is removed from the jig 30, and a
portion of the panel 2 which protrudes from the spacer 3 is cut off. The vibrator 4 can be
obtained as described above.
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[0040]
Next, the vibrating body 4 is disposed in the window 34 of the jig 30, and positioning of the
panel 2 is performed with reference to the inner peripheral surface of the spacer 3. Then, the
magnet 6 is attached to the central portion located on the back side of the panel 2. The magnet 6
is fixed to the panel 2 by applying a predetermined amount of a two-component mixed acrylic
adhesive on a mounting surface to be the front surface and pressing the mounting surface on the
back surface of the panel 2 with a predetermined pressure. After the adhesive is cured, the
vibrator 4 is removed from the jig 30 and an ultraviolet (UV) curable adhesive is applied to the
outer peripheral portion of the magnet 6 in close contact with the panel 2 to reinforce the
adhesive force.
[0041]
Next, a two-component mixed acrylic adhesive is applied to the back surface of the flat coil 7, and
the flat coil 7 is disposed inside the ring-shaped recess 10 so that the coated surface is in close
contact with the bottom of the ring-shaped recess 10. Do. Under the present circumstances, this
flat coil 7 is arrange ¦ positioned in the ring-shaped recessed part 10 so that the convex part 11
may be inserted in the air-core part 21 of the flat coil 7. As shown in FIG. Further, both terminals
7 a and 7 b are passed through the insides of the respective slits 18 and drawn out of the frame
5.
[0042]
Next, an adhesive sheet is attached to the back surface of the spacer 3 of the vibrator 4 to which
the magnet 6 is attached. Then, the vibrating body 4 is attached to the front side of the frame 5
so that the convex plate portion 17 is accommodated in the frame of the spacer 3. Specifically, an
adhesive sheet is interposed on the back surface of the spacer 3 to adhere to the lower plate
portion 16. Furthermore, in this state, the vibrator 4 is pressed toward the frame 5 side. Thereby,
the vibrating body 4 to which the magnet 6 is attached is fixed to the frame 5. Through the
above-described steps, the speaker device 1 is manufactured.
[0043]
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In the speaker device 1 configured as described above, the magnet 6 does not have a large
thickness dimension in the front and back direction, and the flat coil 7 is also formed in a flat
shape having no thickness dimension in the front and back direction. Furthermore, a clearance N
is formed between the magnet 6 and the flat coil 7. For this reason, it becomes possible to reduce
the influence which heat̲generation ¦ fever of the flat coil 7 exerts on the panel 2 used as a
diaphragm. Therefore, even if a panel made of an organic EL or the like susceptible to heat is
used as the panel 2, it is possible to generate high quality sound from the speaker device 1.
Therefore, the speaker device 1 can be thinned while preventing the heat generation of the flat
coil 7 from adversely affecting the panel 2. Further, when the frame 5 is made of aluminum
having a good thermal conductivity, and the surface is subjected to an alumite treatment, the
thermal conductivity of the frame 5 becomes extremely good. Therefore, the heat of the flat coil
7 can be efficiently released to the outside, and as a result, the influence of the heat generation of
the flat coil 7 on the panel 2 can be further reduced.
[0044]
Further, in the speaker device 1, the flat coil 7 wound in the α winding over the two layers is
used as the driving coil. Therefore, it is possible to reduce the thickness of the drive coil, and as a
result, it is possible to reduce the thickness of the speaker device 1. In addition, since the flat coil
7 is wound in an α turn, it is not necessary to arrange two coils separately across the two layers,
and the number of ends of the flat coil 7 can be minimized, such as two. It becomes. For this
reason, the number of terminals 7a and 7b of the flat coil 7 can be reduced, and as a result, the
number of wiring steps can be reduced.
[0045]
Further, the terminals 7 a and 7 b of the flat coil 7 are drawn to the outside of the frame 5
through the slits 18 of the frame 5. For this reason, it can prevent that terminal 7a, 7b vibrates
with the amplitude motion of the flat coil 7, and produces a bending motion. Therefore, it is not
necessary to limit the wire material which comprises flat coil 7 to special materials, such as
cotton thread which has intensity to bending movement and vibration, copper foil, etc., and the
choice of a wire material is expanded. Furthermore, since the terminals 7a and 7b are pulled out
to the outside of the frame 5, it is possible to perform wiring connection on the outside of the
speaker device 1. As a result, the reliability of the wiring structure of the flat coil 7 can be
improved and the wiring structure can be simplified. Therefore, the number of wiring steps can
be significantly reduced.
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[0046]
In the speaker device 1, a total of four magnets 6 are disposed at positions facing the rectangular
portion 20 of the flat coil 7. In addition, the magnet 6 is magnetized in the lateral direction of the
rectangular portion 20, that is, in the radial direction with respect to the flat coil 7. Therefore, the
current of the flat coil 7 flows in the direction orthogonal to the magnetic circuit generated in the
magnet 6, and a larger force acts between the magnet 6 and the flat coil 7. For this reason, it
becomes possible to attain thickness reduction of the speaker apparatus 1, maintaining a
favorable acoustic characteristic. Further, since the magnet 6 is divided and disposed in plurality,
the magnet 6 can be appropriately mounted at a position suitable for driving the flat coil 7, and
the number of steps for mounting the magnet 6 can be reduced.
[0047]
Here, in the case of a panel-type speaker device such as the speaker device 1, the center portion
of the panel 2 has high compliance. That is, the central portion of the panel 2 easily vibrates, and
as it reaches the outside of the panel 2, it becomes difficult to vibrate. If a thin, large-area magnet
is mounted on the panel 2 instead of the magnet 6 and the panel 2 is driven, the driving force is
affected by the compliance of the outer peripheral portion of the panel 2 and a loss occurs.
However, as in the present embodiment, by arranging a plurality of divided magnets 6 for one
panel 2, the panel 2 is vibrated by a driving force corresponding to the compliance of the central
portion. It is possible to As a result, the acoustic characteristics of the speaker device 1 are
improved.
[0048]
As mentioned above, although one embodiment of the present invention was described, the
present invention is not limited to the above-mentioned form, and can be carried out in variously
modified forms.
[0049]
In the above embodiment, the magnet 6 is magnetized in the lateral direction of the rectangular
portion 20, that is, in the radial direction of the flat coil 7, but the magnetization direction in the
magnet 6 is limited to that direction Instead, for example, the magnet may be magnetized in the
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thickness direction of the magnet 6 in the front-rear direction.
Further, as in the present embodiment, the magnet 6 magnetized in the horizontal direction and
the magnet 6 magnetized in the thickness direction may be combined to be disposed at a position
corresponding to the flat coil 7.
[0050]
In the above embodiment, a total of four magnets 6 are arranged, but the number of magnets 6
arranged is not limited to four, and may be three or less, or five or more. As well.
[0051]
Moreover, in the above-mentioned embodiment, although the flat coil 7 and the ring-shaped
recessed part 10 have a substantially square shape, the flat coil 7 and the ring-shaped recessed
part 10 are not limited to the said shape, Purpose of use The shape may be different depending
on the situation.
In addition, the flat coil 7 can be disposed at an appropriate position as appropriate according to
the purpose of use and the like. Further, although the flat coil 7 is wound in α winding, it may be
wound in a usual spiral shape. Furthermore, although the flat coil 7 is wound over two layers, it
may be one layer or three or more layers. In addition, a plurality of flat coils 7 may be arranged
in one speaker device 1.
[0052]
Moreover, in the above-mentioned embodiment, although the shock absorbing material etc. for
suppressing a specific vibration are not arrange ¦ positioned between the panel 2 and the flame ¦
frame 5, the cushioning material is provided between the panel 2 and the flame ¦ frame 5. The
acoustic characteristics may be improved by interposing or applying a dumping agent or the like
to the panel 2 or the frame 5 to suppress the occurrence of the divided vibration.
[0053]
Further, in the above embodiment, the magnet 6 and the flat coil 7 are not coated with a
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magnetic material such as a magnetic fluid, but for example, the magnetic fluid may be injected
into the surfaces of the magnet 6 and the flat coil 7 good.
By injecting the magnetic fluid, it is possible to suppress the damping of the flat coil 7. As a
result, even when an excessive voltage is applied, a collision between the magnet 6 and the flat
coil 7 can be easily prevented, and the generation of abnormal noise due to the collision can be
effectively prevented. In addition, it is possible to prevent the magnet 6 and the flat coil 7 from
colliding with each other and breaking the magnet 6 or the flat coil 7.
[0054]
DESCRIPTION OF SYMBOLS 1 ... Speaker apparatus 2 ... Panel (diaphragm) 5 ... Frame 6 ...
Magnet (permanent magnet) 7 ... Flat coil (coil for drive) 7a, 7b ... Terminal N ... Clearance
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