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JP2009278517

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009278517
The present invention provides a flat speaker which is easy to manufacture while preventing
peeling and damage of a coil. When the amplitude of the current flowing through the coils 30U
and 30L becomes positive, the magnetic field around the coil 30U is strengthened while the
magnetic field around the coil 30L is weakened, and the vibrating body 10 which is a
ferromagnetic body is displaced to the magnet 20U side. . When the amplitude of the current
flowing through the coils 30U and 30L becomes negative, the magnetic field around the coil 30L
is strengthened, while the magnetic field around the coil 30U is weakened, and the vibrating
body 10 which is a ferromagnetic body is displaced toward the magnet 20L. The coils are
disposed on the surfaces of the magnets 20U and 20L and do not vibrate with the vibrating body
10, so there is no peeling or damage of the coils. In addition, since the coil does not face the
outside and does not come in contact with humans or objects, there is no need for a film for
protecting the coil, and it takes less time to manufacture. [Selected figure] Figure 5
Flat speaker
[0001]
The present invention relates to a flat loudspeaker.
[0002]
The flat speaker disclosed in Patent Document 1 includes a vibrating membrane and a plurality
of permanent magnets, and a plurality of spiral and planar coils are disposed on both sides of the
vibrating membrane.
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1
In addition, the coil and the permanent magnet face each other, and when current flows through
the coil, a force acts in a direction perpendicular to the surface on which the coil is disposed on
the vibrating film, and the vibrating film is displaced. Then, when an acoustic signal is supplied to
the coil, the current flowing through the coil changes according to the acoustic signal, and the
force acting on the diaphragm also changes accordingly, and the diaphragm vibrates and the
voice corresponding to the acoustic signal It originates from the speaker.
[0003]
Japanese Patent Application Publication No. 2001-333493
[0004]
In a speaker in which a coil is disposed on a vibrating membrane, heat is generated when current
flows through the coil, and the coil vibrates together with the vibrating membrane and receives
force, so adhesion between the vibrating membrane and the coil is weak And the coil may peel
off the vibrating membrane.
Therefore, in the flat speaker disclosed in Patent Document 1, a film is provided so as to cover
the coil, and the film presses the coil against the diaphragm so that the coil is prevented from
being separated from the diaphragm. However, when the film is provided on the vibrating film, it
takes time and effort to provide the film at the time of production.
[0005]
The present invention has been made under the above-described background, and it is an object
of the present invention to provide a flat speaker that is easy to manufacture while preventing
coil peeling and damage.
[0006]
In order to solve the problems described above, the present invention has a plate-shaped first
magnet having a hole penetrating from one surface to the other surface, and a plate-shaped hole
penetrating from one surface to the other surface. A second magnet disposed opposite to and
spaced apart from the first magnet, a vibrator having planar flexibility and supported between
the first magnet and the second magnet, and A planar first coil disposed on the surface facing the
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vibrator among the first magnets, and a planar coil disposed on the surface facing the vibrator
among the second magnets A plane which has a second coil, and the pole on the surface side of
the first magnet on which the first coil is disposed and the pole on the surface of the second
magnet on which the second coil is disposed is the same type of pole Provide a speaker.
[0007]
Further, according to the present invention, there is provided a first magnet having a plate shape
having a hole penetrating from one surface to the other surface, and a plate shape having a hole
penetrating from one surface to the other surface, and the first magnet A second magnet
oppositely and movably supported at a distance from each other, a vibrator having a planar
flexibility and closing a hole of the second magnet, and the vibrator among the first magnet And
a planar second coil disposed on the surface of the second magnet facing the vibrating body, A
planar speaker in which a pole on the side on which the first coil is disposed in the magnet and a
pole on the side on which the second coil is disposed on the second magnet are the same type of
poles.
[0008]
In the above configuration, the first magnet and the second magnet have an annular shape, and
the first coil and the second coil are wired in a spiral shape, and the wiring direction is opposite
between the inner circumferential side and the outer circumferential side. It may be.
In the above configuration, the first magnet and the second magnet have an annular shape, and
the N pole and the S pole are alternately positioned from the outer peripheral side to the inner
peripheral side on both sides of the plate shape, The first coil is reverse in wiring direction on the
N pole and S pole of the first magnet, and the second coil is reverse in wiring direction on the N
pole and S pole of the second magnet. Good.
[0009]
According to the present invention, it is possible to obtain a flat speaker which is easy to
manufacture while preventing peeling and damage of the coil.
[0010]
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First Embodiment FIG. 1 is a view schematically showing an appearance of a flat speaker 1
according to an embodiment of the present invention, and FIG. 2 is a view schematically showing
a cross section of the flat speaker 1.
As shown in the figure, the flat speaker 1 includes the vibrating body 10, the damper 15, the
magnets 20U and 20L, the film 35 on which the coils 30U and 30L are wired, and the holding
parts 40U and 40L.
Note that the dimensions of each component in the figure are different from the actual
dimensions so that the shape of the component can be easily understood.
[0011]
(Configuration of Each Part of Flat Speaker 1) First, the magnets 20U and 20L are permanent
magnets, and have a plate-like shape and an annular shape.
The magnets 20U and 20L each have an N pole on one side and an S pole on the side opposite to
the N pole. The vibrating body 10 is a thin film plastic surface coated with a ferromagnetic
material in the form of a film, and has a circular shape. The vibrating body 10 is not limited to
the above, and may be a thin film of a ferromagnetic metal. The damper 15 is a member for
supporting the vibrating body 10, and is made of an elastic material in the shape of a torus. The
damper 15 deforms when a force is applied, and returns to its original shape when the applied
force disappears.
[0012]
The film 35 is a thin film of plastic and serves as a base of the coils 30U and 30L. The film 35
has an annular shape, and the inner diameter is the same as the inner diameter of the magnets
20U and 20L, and the outer diameter is also the same as the outer diameter of the magnets 20U
and 20L.
[0013]
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The coils 30U and 30L are formed by spirally wiring a conductive metal on the surface of the
film 35. FIG. 3A is a schematic view of the film 35 as viewed from the side where the coil 30U is
wired. As shown in this figure, the coil 30U is wired in a counterclockwise direction
(counterclockwise) from the outside to the inside. A pattern is provided, and the input ends 31A
and 31B to which an acoustic signal is input are provided at both ends of the wiring pattern, and
when a predetermined portion between the inner periphery and the outer periphery of the film
35 is reached, the direction of the wiring pattern is It is in the opposite clockwise direction
(clockwise). FIG. 3B is a schematic view of the film 35 as viewed from the side where the coil 30L
is wired, and as shown in this figure, the coil 30L is turned clockwise (clockwise) from the
outside to the inside. The wiring pattern is provided, and the input ends 32A and 32B to which
acoustic signals are input are provided at both ends of the wiring pattern, and when reaching a
predetermined portion between the inner periphery and the outer periphery of the film 35, the
direction of the wiring pattern Is in the opposite counterclockwise direction (counterclockwise).
In the present embodiment, the position where the direction of the wiring pattern is opposite in
the coils 30U and 30L is the position of the middle point of the film 35 in the radial direction.
[0014]
The holding portions 40U and 40L are members for fixing the magnets 20U and 20L, and are
formed of an insulating nonmagnetic material (for example, plastic). The holding portions 40U
and 40L are in the shape of a cylinder, and one of the two circular openings has an edge portion
protruding in an annular shape in the radial direction of the cylinder (the center direction of the
circular opening), and one opening The diameter of the portion is smaller than the diameter of
the other opening (in the following description, the opening with the smaller diameter in the
holding portion 40L is the first opening, and the opening with the larger diameter is the second
opening The opening on the smaller diameter side of the holding portion 40U is referred to as a
third opening, and the opening on the larger diameter side is referred to as a fourth opening).
The holding unit 40L has a terminal 40LA to which an acoustic signal is input and a terminal
40LB. The holding unit 40U has a terminal 40UA to which an acoustic signal is input and a
terminal 40UB.
[0015]
The inner diameters of the holding portions 40U and 40L are slightly larger than the outer
diameters of the magnets 20U and 20L so that the magnets 20U and 20L fit in the hollow
portion of the cylinder. In addition, for the smaller first and third openings, the diameter of the
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opening is smaller than the outer diameter of the magnets 20U and 20L, and the magnets 20U
and 20L housed in the hollow portion overhang in an annular shape. Can be supported by the In
addition, the length of the holding portion 40L in the direction along the central axis is longer
than the length of the holding portion 40U in the direction along the central axis.
[0016]
(Whole structure of the flat speaker 1) In the flat speaker 1, the film 35 in which the coil 30L is
wired is bonded to the N pole side of the magnet 20L. The magnet 20L is housed in the holding
portion 40L with the S pole side facing the first opening from the second opening side of the
holding portion 40L, and the S pole side of the magnet 20L has an annular shape of the first
opening. It is bonded to the overhanging part. The input end 32A of the coil 30L is connected to
the terminal 40LA through a lead (not shown), and the input end 32B is connected to the
terminal 40LB through a lead (not shown).
[0017]
Further, in the flat speaker 1, the vibrating body 10 is bonded to the edge portion on the inner
peripheral side of the damper 15, and the edge portion on the outer peripheral side of the
damper 15 is bonded to the inner peripheral surface of the holding portion 40L. And the coil
30L.
[0018]
On the other hand, the film 35 in which the coil 30U is disposed is adhered to the N pole side of
the magnet 20U.
The magnet 20U is housed in the holder 40U with the south pole side facing the third opening
from the fourth opening side of the holder 40U, and the south pole side of the magnet 20U has
an annular shape of the third opening. It is bonded to the overhanging part. The input end 31A of
the coil 30U is connected to the terminal 40UA via a lead wire (not shown), and the input end
31B is connected to the terminal 40UB via a lead wire (not shown).
[0019]
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And the end by the side of the 4th opening of attaching part 40U and the end by the side of the
2nd opening of attaching part 40L are pasted up, and, in plane speaker 1, the N pole of magnet
20U and magnet 20L The N pole and the N pole face each other, and the vibrator 10 is located at
an intermediate position between the two N poles. Further, in the flat speaker 1, since the coil
30U faces the coil 30L, when the coil 30U and the coil 30L are viewed from the S pole side of the
magnet 20U, the directions of the wiring patterns thereof are the same.
[0020]
(Operation of Flat Speaker 1) Next, the operation of the flat speaker 1 will be described with
reference to FIGS. In the following description, the operation will be described by taking the case
where the acoustic signal shown in FIG. 4 is input as an example. 5 and 6 are schematic views for
explaining the operation of the flat loudspeaker 1, and are enlarged views of the portions of the
coils 30U and 30L, and "." Is described in the cross section of the wiring of the coil The current
means that current flows from the back to the front of the drawing, and for those with "x" in the
cross section of the wiring of the coil, the current flows from the front to the back of the drawing
Shall mean that. Further, the arrow on the two-dot chain line in the figure indicates the direction
of the magnetic field generated by the current flowing through the coil.
[0021]
When the signal shown in FIG. 4 is supplied to the terminals 40LA and 40LB and the terminals
40UA and 40UB of the flat speaker 1, first, when the amplitude of the acoustic signal is 0,
current flows in both of the coils 30U and 30L. Since the magnetic field according to the righthanded screw law is not generated around each coil, here, the vibrating body 10 which is a
ferromagnetic body is supported by the damper 15 and positioned between the magnet 20U and
the magnet 20L. There is.
[0022]
Next, when the amplitude of the acoustic signal supplied to the coils 30U and 30L becomes
positive, a current flows from the input end 31A to the input end 31B in the coil 30U, and in the
coil 30L, the input end from the input end 32A A current flows in the direction of 32B, and a
magnetic field is generated concentrically around each coil according to the right-handed screw
law, as shown by the two-dot chain line in FIG.
[0023]
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Here, as shown in FIG. 5, a portion of the coil 30 U in which the wiring pattern is clockwise as
viewed from the S pole side of the magnet 20 U (“x” is described in the cross section of the
wiring of the coil In the part), the magnetic field is generated in the same direction as the
direction of the magnetic field of the magnet 20U.
The magnetic field of the magnet 20U is also present in the portion of the coil 30U in which the
wiring pattern is counterclockwise as viewed from the S pole side of the magnet 20U (the portion
where “·” is described in the cross section of the wiring of the coil). A magnetic field is
generated in the same direction as the direction of.
That is, since the magnetic field in the same direction as the magnetic field of the magnet 20U is
generated in the coil 30U, the magnetic field on the magnet 20U side becomes stronger
compared to the case where no current flows in the coil 30U.
[0024]
On the other hand, as shown in FIG. 5, a portion of the coil 30L in which the wiring pattern is
clockwise as viewed from the S pole side of the magnet 20U (a portion where "x" is described in
the cross section of the wiring of the coil ), A magnetic field is generated in the direction opposite
to the direction of the magnetic field of the magnet 20L. Further, in the coil 30L, even in a
portion where the wiring pattern is counterclockwise viewed from the S pole side of the magnet
20U (a portion where “•” is described in the cross section of the wiring of the coil), A magnetic
field is generated in the direction opposite to the direction of the magnetic field. In the coil 30L, a
magnetic field in the opposite direction to the magnet 20L is generated, so the magnetic field on
the magnet 20L side is weaker than in the case where no current flows through the coil 30L.
[0025]
As described above, when the amplitude of the current flowing through the coils 30U and 30L is
positive, the magnetic field on the magnet 20U side is strengthened and the magnetic field on the
magnet 20L side is weakened as viewed from the vibrating body 10, so that the vibrating body
10 is a ferromagnetic material. The magnetic field is displaced toward the strong magnet 20U.
[0026]
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Next, when the amplitude of the acoustic signal supplied to the coils 30U and 30L becomes
negative, in the coil 30U, current flows from the input end 31B toward the input end 31A, and in
the coil 30L, the input end from the input end 32B A current flows in the direction of 32A, and a
magnetic field is generated concentrically around the coil according to the right-handed screw
law, as indicated by the two-dot chain line in FIG.
[0027]
Here, as shown in FIG. 6, a portion of the coil 30U in which the wiring pattern is clockwise as
viewed from the S pole side of the magnet 20U (“.” Is described in the cross section of the
wiring of the coil In the part), a magnetic field is generated in the direction opposite to the
direction of the magnetic field of the magnet 20U.
In addition, even in a portion of the coil 30U in which the wiring pattern is counterclockwise
viewed from the S pole side of the magnet 20U (a portion where “x” is described in the cross
section of the wiring of the coil), the magnetic field of the magnet 20U A magnetic field is
generated in the direction opposite to the direction of.
That is, since the magnetic field in the opposite direction to the magnetic field of the magnet 20U
is generated in the coil 30U, the magnetic field on the magnet 20U side becomes weaker as
compared with the case where no current flows in the coil 30U.
[0028]
On the other hand, as shown in FIG. 6, a portion of the coil 30L in which the wiring pattern is
clockwise as viewed from the S pole side of the magnet 20U (a portion where "." Is described in
the cross section of the wiring of the coil ), A magnetic field is generated in the same direction as
the direction of the magnetic field of the magnet 20L. Further, even in a portion of the coil 30L in
which the wiring pattern is counterclockwise viewed from the S pole side of the magnet 20U (a
portion where “x” is described in the cross section of the wiring of the coil), the magnetic field
of the magnet 20L A magnetic field is generated in the same direction as the direction of. That is,
since the magnetic field in the same direction as the magnetic field of the magnet 20L is
generated in the coil 30L, the magnetic field on the magnet 20L side becomes stronger than the
case where the current does not flow in the coil 30L.
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[0029]
As described above, when the amplitude of the current flowing through the coils 30U and 30L
becomes negative, the magnetic field on the magnet 20U side weakens and the magnetic field on
the magnet 20L side increases from the viewpoint of the vibrating body 10, so that the vibrating
body 10 is a ferromagnetic material The magnetic field is displaced toward the strong magnet
20L.
[0030]
As described above, in the flat speaker 1 according to the present embodiment, the direction of
the magnetic field generated around the coil changes according to the positive or negative of the
amplitude of the acoustic signal, and the vibrating body 10 is vertically moved according to the
direction of the magnetic field of each coil. Displace.
The strength of the magnetic field generated around each coil changes depending on the
magnitude of the current flowing through each coil, and the displacement amount of the vibrator
10 also changes according to the strength of the magnetic field. Since the displacement direction
and displacement amount of the vibrating body 10 correspond to the amplitude of the acoustic
signal, the vibrating body 10 vibrates according to the amplitude of the acoustic signal, and
according to the vibration state (frequency, amplitude, phase) Sound is generated from the
vibrating body 10. Then, the generated sound is radiated to the outside of the flat speaker 1
through the holes of the magnets 20U and 20L in the shape of a ring.
[0031]
According to the present embodiment, the coils 30U and 30L do not vibrate and receive no force
from the outside, so there is no peeling or damage of the coil due to the vibration. In addition,
since the coil does not face the outside and does not come in contact with humans or objects,
there is no need to coat the coil for protection, and the manufacturing does not take time.
[0032]
Second Embodiment Next, a flat loudspeaker 1A according to a second embodiment of the
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10
present invention will be described. The external appearance of the flat speaker 1A according to
the second embodiment of the present invention is the same as that of the flat speaker 1 of the
first embodiment, but the vibrating body 10 is bonded to the magnet 20L, and the magnet 20L is
displaced to generate sound. It differs from the flat loudspeaker 1 of the first embodiment in that
it is generated.
[0033]
FIG. 7 is a view schematically showing a cross section of a flat loudspeaker 1A according to a
second embodiment of the present invention. In the following description, in the flat loudspeaker
1A, the same parts as those of the first embodiment are denoted by the same reference numerals,
and the description thereof is omitted.
[0034]
The holding portion 41L has a cylindrical shape, and is formed of an insulating nonmagnetic
material (for example, plastic). Comparing the holding portion 41L with the holding portion 40L
of the first embodiment, while the holding portion 40L has a portion that protrudes in an annular
shape at one side of the circular opening, the holding portion 41L does not It differs in that it
does not have a part.
[0035]
The support member 50 is a member for supporting the magnet 20U, and has an annular shape.
The support member 50 is formed of an insulating nonmagnetic material (for example, plastic),
and the inner diameter is slightly larger than the outer diameter of the magnet 20U, and the
outer diameter is slightly smaller than the inner diameter of the holding portion 40U.
[0036]
The coil 30LA wired to the film 35 has the reverse direction of the coil 30L and the wiring
pattern as shown in FIG. 8, and the film 35 viewed from the side where the coil 30LA is disposed,
from the outside to the inside The wiring pattern is provided in a counterclockwise direction
(counterclockwise), and when the predetermined portion between the inner circumference and
the outer circumference of the film 35 is reached, the direction of the wiring pattern is opposite
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clockwise (clockwise). .
[0037]
(Overall Configuration of Flat Speaker 1A) In the flat speaker 1A, the film 35 on which the coil
30LA is disposed is bonded to the N pole side of the magnet 20L, and the magnet 20L is bonded
to the inner peripheral side of the damper 15. .
Further, the vibrator 10 is bonded to the magnet 20L so as to close the hole of the magnet 20L in
the shape of an annular ring. In the present embodiment, the vibrating body 10 is preferably
nonmagnetic, lightweight, and rigid. The magnet 20L to which the damper 15 is bonded is
housed inside the holding portion 41L, and the outer peripheral side of the damper 15 is fixed to
the holding portion 41L. The input end 32A of the coil 30LA is connected to the terminal 40LA
via a lead (not shown), and the input end 32B is connected to the terminal 40LB via a lead (not
shown).
[0038]
On the other hand, the film 35 in which the coil 30U is disposed is adhered to the N pole side of
the magnet 20U, and the magnet 20U is adhered to the inner circumferential side of the support
member 50. The magnet 20U to which the support member 50 is adhered is housed in the
holding portion 40U with the S pole side facing the third opening from the fourth opening side of
the holding portion 40U, and the S pole side is a circle of the third opening It is glued to the
annular overhanging part. The input end 31A of the coil 30U is connected to the terminal 40UA
via a lead (not shown), and the input end 31B is connected to the terminal 40UB via a lead (not
shown).
[0039]
Then, the end of the holding portion 40U on the fourth opening side and the end of the holding
portion 40L on the one opening side are bonded, and in the flat speaker 1A, the N pole of the
magnet 20U and the N pole of the magnet 20L And are located opposite to each other. Further,
in the flat loudspeaker 1A, the coil 30U faces the coil 30LA, and when the coil 30U and the coil
30LA are viewed from the S pole side of the magnet 20U, the directions of their wiring patterns
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are opposite to each other.
[0040]
In the flat speaker 1A, the magnet 20L is supported inside the holding portion 41L by the
damper 15, and can be vertically displaced by the elasticity of the damper 15. Further, in the flat
speaker 1A, since the N pole of the magnet 20U and the N pole of the magnet 20L face each
other, the magnet 20L repels the magnet 20U, and the repulsive force balances the force of the
damper 15 supporting the magnet 20L. Located in a place.
[0041]
(Operation of Flat Speaker 1A) Next, the operation of the flat speaker 1A will be described with
reference to FIG. 9 and FIG. In the following description, the operation will be described by taking
the case where the acoustic signal shown in FIG. 4 is input as an example. FIGS. 9 and 10 are
diagrams for explaining the operation of the flat loudspeaker 1A, and are enlarged views of the
portions of the coils 30U and 30LA, and “·” is described in the cross section of the wiring of
the coil. One means that current flows from the back to the front of the drawing, and one with "x"
in the coil cross section means that current flows from the front to the back of the drawing It
shall be. Further, the arrow on the two-dot chain line in the figure indicates the direction of the
magnetic field generated by the current flowing through the coil.
[0042]
When the signals shown in FIG. 4 are supplied to the input terminals 31A and 31B and the input
terminal terminals 32A and 32B, first, when the amplitude of the acoustic signal is 0, no current
flows in any of the coils 30U and 30LA. Since the magnetic field according to the right-handed
screw law is not generated around each coil, here, the magnet 20L repels the magnet 20U, and
the magnet 20L repels at a position where the repulsive force and the force of the damper 15
support the magnet 20L are balanced. It is stationary.
[0043]
Next, when the amplitude of the acoustic signal supplied to the coils 30U and 30LA becomes
positive, current flows from the input end 31A to the input end 31B in the coil 30U, and in the
coil 30LA, the input end from the input end 32A A current flows in the direction of 32B, and a
magnetic field is generated concentrically around the coil according to the right-handed screw
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law, as indicated by the two-dot chain line in FIG.
[0044]
Here, as shown in FIG. 9, a portion of the coil 30U in which the wiring pattern is clockwise as
viewed from the S pole side of the magnet 20U (“x” is described in the cross section of the
wiring of the coil In the part), the magnetic field is generated in the same direction as the
direction of the magnetic field of the magnet 20U.
The magnetic field of the magnet 20U is also present in the portion of the coil 30U in which the
wiring pattern is counterclockwise as viewed from the S pole side of the magnet 20U (the portion
where “·” is described in the cross section of the wiring of the coil). A magnetic field is
generated in the same direction as the direction of.
That is, since the magnetic field in the same direction as the magnetic field of the magnet 20U is
generated in the coil 30U, the magnetic field on the magnet 20U side becomes stronger
compared to the case where no current flows in the coil 30U.
[0045]
On the other hand, as shown in FIG. 9, a portion of the coil 30LA in which the wiring pattern is
clockwise as viewed from the S pole side of the magnet 20U (a portion where "." Is described in
the cross section of the wiring of the coil ), A magnetic field is generated in the same direction as
the direction of the magnetic field of the magnet 20L. The magnetic field of the magnet 20L is
also present in the portion of the coil 30LA in which the wiring pattern is counterclockwise as
viewed from the S pole side of the magnet 20U (the portion where “x” is described in the cross
section of the wiring of the coil). A magnetic field is generated in the same direction as the
direction of. That is, since the magnetic field in the same direction as the magnetic field of the
magnet 20L is generated in the coil 30LA, the magnetic field on the magnet 20L side becomes
stronger compared to the case where the current does not flow in the coil 30U.
[0046]
As described above, when the amplitude of the current flowing through the coils 30U and 30LA
becomes positive, the magnetic field around the coil 30U becomes stronger and the magnetic
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field around the coil 30LA also becomes strong, and the repulsive force between the magnet 20L
and the magnet 20U becomes stronger. The displaceable magnet 20L is displaced together with
the vibrating body 10 in the opposite direction to the magnet 20U.
[0047]
Next, when the amplitude of the acoustic signal supplied to the coils 30U and 30L becomes
negative, in the coil 30U, current flows from the input end 31B toward the input end 31A, and in
the coil 30LA, the input end from the input end 32B A current flows in the direction of 32A, and
a magnetic field is generated concentrically around the coil in accordance with the right-handed
screw law, as indicated by a two-dot chain line in FIG.
[0048]
Here, as shown in FIG. 10, a portion of the coil 30U in which the wiring pattern is clockwise as
viewed from the S pole side of the magnet 20U (“.” Is described in the cross section of the
wiring of the coil In the part), a magnetic field is generated in the direction opposite to the
direction of the magnetic field of the magnet 20U.
In addition, even in a portion of the coil 30U in which the wiring pattern is counterclockwise
viewed from the S pole side of the magnet 20U (a portion where “x” is described in the cross
section of the wiring of the coil), the magnetic field of the magnet 20U A magnetic field is
generated in the direction opposite to the direction of.
That is, since the magnetic field in the opposite direction to the magnetic field of the magnet 20U
is generated in the coil 30U, the magnetic field on the magnet 20U side becomes weaker as
compared with the case where no current flows in the coil 30U.
[0049]
Further, as shown in FIG. 10, a portion of the coil 30LA in which the wiring pattern is clockwise
as viewed from the S pole side of the magnet 20U (a portion where "x" is described in the cross
section of the wiring of the coil ), A magnetic field is generated in the direction opposite to the
direction of the magnetic field of the magnet 20L. In addition, the magnetic field of the magnet
20L also in the portion of the coil 30LA in which the wiring pattern is counterclockwise viewed
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15
from the S pole side of the magnet 20U (the portion where “·” is described in the cross section
of the wiring of the coil). A magnetic field is generated in the direction opposite to the direction
of. That is, since the magnetic field in the direction opposite to the direction of the magnetic field
of the magnet 20L is generated in the coil 30LA, the magnetic field on the magnet 20L side
becomes weaker as compared to the case where no current flows in the coil 30LA.
[0050]
As described above, when the amplitude of the current flowing through the coils 30U and 30LA
becomes negative, the magnetic field around the coil 30U weakens and the magnetic field around
the coil 30LA weakens, and the repulsive force of the magnet 20L against the magnet 20U
weakens. With the elastic force of the damper 15, the magnet 20L is displaced together with the
vibrating body 10 in the direction of the magnet 20U.
[0051]
As described above, in the flat speaker 1A according to the present embodiment, the direction of
the magnetic field generated around the coil changes according to the positive or negative of the
amplitude of the acoustic signal, and the vibrating body 10 together with the magnet 20L
according to the direction of the magnetic field of each coil. Is displaced up and down.
The strength of the magnetic field generated around each coil changes depending on the
magnitude of the current flowing through each coil, and the displacement amount of the magnet
20L and the vibrating body 10 also changes according to the strength of the magnetic field. Since
the displacement direction and displacement amount of the vibrating body 10 correspond to the
amplitude of the acoustic signal, the vibrating body 10 vibrates according to the amplitude of the
acoustic signal, and the vibration state (frequency, amplitude, phase) thereof A rumbling sound is
generated from the vibrating body 10. Then, the generated sound is radiated to the outside of the
planar speaker 1A through the holes of the magnets 20U and 20L in the shape of a circular ring.
[0052]
According to the present embodiment, since the coils 30U and 30LA do not receive external
force, there is no peeling or damage of the coil due to vibration. In addition, since the coil does
not face the outside and does not come in contact with humans or objects, there is no need to
coat the coil for protection, and the manufacturing does not take time.
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[0053]
[Modifications] Although the embodiment of the present invention has been described above, the
present invention is not limited to the above-described embodiment, and can be practiced in
various other forms. For example, the above-described embodiment may be modified as follows
to implement the present invention.
[0054]
In the first embodiment described above, one surface side of the magnets 20U and 20L is the N
pole and the other surface side is the S pole. However, as shown in FIG. The pole and the south
pole may be alternately arranged. FIG. 11 is a view schematically showing a cross section of this
modification. In FIG. 11, only the magnets 20UA and 20LA, the coils 30UB and 30LB, the vibrator
10 and the film 35 are shown in order to prevent the drawing from being complicated. In this
configuration, the coil 30UB disposed on the magnet 20UA side is wired such that the direction
of the current flows from the input end 31A to the input end 31B in the direction of FIG. 11, and
the coil 30LB disposed on the magnet 20LA side Is wired such that the direction of the current
when flowing from the input end 32A to the input end 32B is the direction shown in FIG. Also in
this configuration, when current flows in the direction shown in FIG. 11, the magnetic field on
the magnet 20UA side becomes strong, while the magnetic field on the magnet 20LA side
becomes weak, and the vibrating body 10 is displaced to the magnet 20UA side. When the
current flows in the opposite direction to that shown in FIG. 11, the magnetic field on the magnet
20UA side becomes weak, while the magnetic field on the magnet 20LA side becomes strong, and
the vibrating body 10 is displaced to the magnet 20LA side.
[0055]
Also, in the second embodiment described above, the magnet 20U may be used instead of the
magnet 20U, and the magnet 20L may be used instead of the magnet 20L. FIG. 12 is a view
schematically showing a cross section of this modification. In FIG. 12 as well, only the magnets
20UA and 20LA, the coils 30UC and 30LC, the vibrator 10 and the film 35 are shown in order to
prevent the drawing from being complicated. In this configuration, the coil 30UC disposed on the
magnet 20UA side is wired such that the direction of the current flows from the input end 31A to
the input end 31B in the direction of FIG. 12 and the coil 30LC disposed on the magnet 20LA
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side Are wired such that the direction of the current when flowing from the input end 32A to the
input end 32B is the direction shown in FIG. Also in this configuration, when current flows in the
direction shown in FIG. 12, the magnetic field on the magnet 20UA side becomes strong and the
magnetic field on the magnet 20LA side becomes strong, and the magnet 20LA is displaced
together with the vibrating body 10 to the opposite side to the magnet 20UA. When the current
flows in the opposite direction to that shown in FIG. 12, the magnetic field on the magnet 20UA
side weakens and the magnetic field on the magnet 20LA side also weakens, and the magnet
20LA is displaced together with the vibrating body 10 to the magnet 20UA side.
[0056]
In the configuration shown in FIGS. 11 and 12, an iron plate having the same ring shape as the
magnet may be attached to the surface of the magnet opposite to the surface on which the coil is
disposed.
[0057]
In the embodiment described above, the shape of the flat speakers 1 and 1A when viewed from
the S pole side of the magnet 20U is an annular shape, but if a hole is opened at the central
portion, the shape is rectangular or many It may be another shape such as a square.
[0058]
In the first embodiment described above, the magnets 20U and 20L are in the shape of a circular
ring, but each magnet is in the shape of a disk, and a plurality of holes penetrating the magnet in
the gaps of the wiring pattern of each coil It may be provided.
According to this configuration, since the vibrating body 10 is not exposed to the outside, there is
no possibility that the vibrating body 10 may be damaged by touching another object, and the
sound generated by the vibrating body 10 is radiated to the outside through this hole. Be done.
[0059]
In the second embodiment described above, the direction of the wiring pattern of each coil when
viewed from the S pole side of the magnet 20U is the same as in the first embodiment, and the
coil on the magnet 20L side is the coil on the magnet 20U side. An acoustic signal opposite in
11-05-2019
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phase to the supplied acoustic signal may be supplied.
In the first embodiment, the direction of the wiring pattern of each coil when viewed from the S
pole side of the magnet 20U is the same as that of the second embodiment, and the coil on the
magnet 20L side is the coil on the magnet 20U side. An acoustic signal opposite in phase to the
supplied acoustic signal may be supplied.
[0060]
In the embodiment described above, the terminals to which acoustic signals are input are four
terminals 40UA, 40UB, 40LA, and 40LB, but two terminals are used, one of which is connected to
the input terminals 31A and 32A, One terminal may be connected to the input terminals 31B and
32B.
[0061]
In the embodiment described above, the coils 30U, 30L, and 30LA are provided with wiring
portions in which the direction of the wiring is opposite to the outer peripheral side on the inner
peripheral side, but in the opposite direction to the outer peripheral side on the inner peripheral
side. You may not do this.
[0062]
In the first embodiment and the second embodiment described above, the N pole of the magnet
20U and the N pole of the magnet 20L face each other, but the S pole of the magnet 20U faces
the S pole of the magnet 20L, and the S pole The coil may be disposed on the surface of
[0063]
FIG. 1 is an external view of a flat speaker 1 according to an embodiment of the present
invention.
FIG. 2 is a cross-sectional view of the flat loudspeaker 1;
It is a schematic diagram of the wiring pattern of coil 30U, 30L.
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FIG. 2 is a diagram exemplifying an acoustic signal input to a flat speaker 1. It is a figure for
demonstrating the effect | action of the planar speaker 1. FIG. It is a figure for demonstrating the
effect | action of the planar speaker 1. FIG. It is sectional drawing of the flat speaker 1A which
concerns on 2nd Embodiment of this invention. It is a schematic diagram of the wiring pattern of
coil 30LA. It is a figure for demonstrating the effect | action of the planar speaker 1A. It is a
figure for demonstrating the effect | action of the planar speaker 1A. It is a schematic diagram of
the cross section of the flat speaker which concerns on the modification of this invention. It is a
schematic diagram of the cross section of the flat speaker which concerns on the modification of
this invention.
Explanation of sign
[0064]
1, 1A: Flat speaker, 10: Vibrator, 20U, 20L, 20UA, 20LA: Magnet, 30U, 30L, 30LA, 30UB, 30LB,
30UC, 30LC: Coil, 31A, 31B, 32A, 32B: Input end, 35: Film, 40U, 40L, 41L: Holding portion,
40UA, 40UB, 40LA, 40LB: Terminal, 50: Support member
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