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JP2010098461

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DESCRIPTION JP2010098461
An object of the present invention is to provide a flat speaker in which a vibrating body is not
damaged from the outside. When a current value of an acoustic signal changes, a pin 61 of a
solenoid 60 moves, and a second magnet plate 52 moves in the X-axis direction. Then, the
repulsive force generated between the first magnet plate 42 and the second magnet plate 52
changes, and the vibrating body 40 is displaced in the Z-axis direction, and a sound is generated
from the vibrating body 40. Since the vibrating body 40 facing the outside is formed of metal,
there is little possibility of breakage even if an object collides with the vibrating body 40, and
there is no hindrance to the reproduction of sound. [Selected figure] Figure 2
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.
Further, the coil and the permanent magnet face each other, and when a current flows through
the coil, a force acts in a direction perpendicular to the vibrating film to displace the vibrating
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film. 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. In the flat speaker disclosed in Patent Document 1, heat is generated
when current flows through the coil, and the coil vibrates with the diaphragm vigorously and
receives force, so the adhesive force between the diaphragm and the coil is If it is weak, the coil
may peel off from the vibrating membrane. Therefore, in the flat speaker disclosed in Patent
Document 1, a film of resin is provided so as to cover the coil, and the film is pressed against the
diaphragm by this film, and the coil is prevented from peeling off from the diaphragm .
[0003]
Japanese Patent Application Publication No. 2001-333493
[0004]
Now, the speaker may be damaged due to the collision of objects from outside in addition to the
damage due to the aged deterioration, for example, in a case of ordinary household, when the
infant etc. directly touches or the toy etc. collides and the diaphragm is damaged. There is.
In the speaker disclosed in Patent Document 1, a resin film is formed on the surface of the
vibrating film, and although this film prevents some damage, it is difficult to prevent the damage
of sharp ones, etc., and the film is broken. As a result, the coil may be damaged, which may
disturb the reproduction of sound.
[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 loudspeaker in which the vibrating body is less
susceptible to external damage.
[0006]
In order to solve the problems described above, the present invention provides a plate-shaped
vibrating body, a driving body positioned at a distance facing the vibrating body in a plate shape,
and the driving body according to an acoustic signal representing a sound. Drive means for
moving the vibration body, the vibration body has a first region of N pole or S pole on the side
facing the drive body, and the drive body faces the vibration body; A second area of the same
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pole as that of the first area on the side where the second body is moved, and when the driving
member is moved by the driving means, the second area moves relative to the first area; There is
provided a flat speaker characterized in that a repulsive force generated between a region and
the second region changes to displace the vibrator.
[0007]
In the present invention, the vibrating body has a third area of a pole different from the first area
on the side facing the driving body, and the driving body faces the vibrating body. The fourth
region of the same pole as the third region is provided on the side, and when the drive moves by
the drive means, the fourth region moves relative to the third region, and the third region and the
fourth region are moved. The vibrating body may be displaced by changing the repulsive force
generated between itself and the region.
In the present invention, the first area, the second area, the third area and the fourth area may be
regularly arranged.
Further, in the present invention, the plate-shaped and magnetic plate is at least the surface of
the vibrating body opposite to the surface facing the driving body, or the surface of the driving
body facing the vibrating body and It is good also as composition stuck on either of the field of
the opposite side. Further, in the present invention, the vibrator may be configured such that a
side surface opposite to the side surface is displaced with a part of the side surface as a center.
[0008]
Further, according to the present invention, there is provided a plate-like vibrator, a driver having
a plate shape facing the vibrator at a distance, and driving means for moving the driver according
to an acoustic signal representing a sound. The vibrating body has a first region of N pole or S
pole on the side facing the driving body, and the driving body on the side facing the vibrating
body. The second region of the first region has a second region of a pole different from the pole
of the first region, and the second region moves relative to the first region when the driving
member is moved by the driving means, the first region and the second region The flat speaker
according to the present invention is characterized in that a suction force generated between the
two is changed to displace the vibrator in a direction away from the driver or in a direction
approaching the driver.
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[0009]
According to the present invention, it is possible to provide a flat speaker in which the vibrating
body is not damaged from the outside.
[0010]
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.
In the drawings, the dimensions of each component are different from the actual dimensions so
that the shapes of the components can be easily understood.
Further, in the drawings, those in which ??? is described in ?o? means an arrow directed
from the back to the front of the drawing, and those in which ?x? is described in ?o? are the
front of the drawing. It means the arrow from the back to the back.
[0011]
(Configuration of Each Part of Flat Speaker 1) First, the housing 10 is composed of a plate-like
square bottom plate 11 and a side wall 12 in the shape of a square tube, and the bottom plate 11
is one of the side walls 12 The side wall 12 is fixed so as to close the opening.
[0012]
The vibrating body 40 is a first plate 41 formed by processing a metal having magnetism into a
plate shape and a square shape, and a plurality of square magnets 45 each having a plate shape,
one surface side being an N pole and the other surface side being an S pole. It is comprised by
the 1st magnet plate 42 connected.
Here, in the first magnet plate 42, as shown in FIG. 3, the magnets 45 are arranged in 3 rows and
3 columns so that the N pole and the S pole are alternately arranged, and adjacent magnets are
fixed to each other It is in the form of The area of the first magnet plate 42 is smaller than that of
the first plate 41, and the first magnet plate 42 is fixed to the central portion of the first plate 41
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with the N pole at the center facing the first plate 41.
[0013]
The driving body 50 arranges the magnet 45 in 3 rows and 3 rows in the same manner as the
second plate 51 formed by processing a metal having magnetism into a square plate shape and
the first magnet plate 42 and fixes adjacent magnets to each other. It is comprised by the 2nd
magnet plate 52 of the plate-shaped structure. The area of the second magnet plate 52 is the
same as that of the second plate 51, and the second magnet plate 52 is fixed to the second plate
51 with the N pole at the center facing the second plate 51.
[0014]
The damper 30 is a member for supporting the vibrating body 40, and is made of an elastic
material in a square frame shape. In addition, the damper 30 is corrugated and has a semicircular
portion when viewed in cross section. When a force in the Z direction is applied to the inner
peripheral portion, the semicircular portion is deformed, and when the applied force is
eliminated, the original Return to the shape of.
[0015]
The solenoid 60 converts electrical energy of a signal supplied from the outside through an input
terminal (not shown) provided in the housing 10 into mechanical linear motion. The solenoid 60
has a pin 61 and moves this pin in response to the supplied signal.
[0016]
The support member 25 is formed by processing the same material as the bottom plate 11 into a
plate shape and a rectangular shape, and is fixed to the bottom plate 11 as shown in FIG. 2 and
has a wall orthogonal to the bottom plate 11. The spring 35 is a coil spring, one end of which is
fixed to the support member 25 and the other end of which is fixed to the side surface of the
drive unit 50.
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[0017]
(Structure of Flat Speaker 1) In the flat speaker 1, a plurality of solenoids 60 are arranged in the
X direction and fixed to the bottom plate 11, and the pins 61 of the respective solenoids 60 are
as shown in FIG. It is fixed to one side. The side opposite to the side fixed to the pin 61 in the
driving body 50 is fixed to the spring 35, and the driving body 50 supports the solenoid 60 with
a distance from the bottom plate 11 as shown in FIG. It is supported by a member 25 and a
spring 35. The driving body 50 is fixed to the spring 35 and the pin 61 so that the second plate
51 faces the bottom plate 11, and the second magnet plate 52 has a south pole at the center side
in the Z direction (opposite to the bottom plate 11) Direction).
[0018]
The outer edge of the damper 30 is fixed to the inner peripheral side of the side wall 12 at the
opening on the side opposite to the side to which the bottom plate 11 is fixed in the side wall 12.
The sides are fixed. The first plate 41 is fixed to the inner edge of the damper 30 so that the first
magnet plate 42 faces the second magnet plate 52 as shown in FIG. It is oriented in the direction
of the two-magnet plate 52. For this reason, in the first magnet plate 42 and the second magnet
plate 52, the magnets constituting each magnet plate face each other, and as shown in FIG. 4, the
opposing magnets face each other in polarity facing each other There is an area that is the same.
[0019]
(Operation of Flat Speaker 1) Next, the operation of the flat speaker 1 will be described. In the
flat speaker 1, an alternating current acoustic signal representing a sound is input from an input
terminal (not shown) and sent to the solenoid 60. When an acoustic signal is input, the solenoid
60 moves the pin 61 in accordance with the input acoustic signal.
[0020]
Specifically, the acoustic signal input to the input terminal is the AC acoustic signal plus the bias
current Ib, and as shown in FIG. 5, the amplitude of the current value is maximum around the
bias current Ib. It is adjusted to be within the range of Imax to the minimum value Imin. Then,
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when the current value of the acoustic signal before the bias current is applied is 0, a signal
whose current value is Ib is input to the input terminal, and the pin 61 of the solenoid 60 moves
according to the current value of this signal. . Here, the positional relationship between the first
magnet plate 42 and the second magnet plate 52 moved by the pins 61 is as shown in FIG. 6B,
and although it is not shifted in the Y direction when viewed from the Z direction, When viewed
from the first magnet plate 42, the second magnet plate 52 is shifted by x1 in the X direction,
and an area of 80% of the surface of the first magnet plate 42 facing the second magnet plate 52
is the second magnet plate 52 And the polarity of the surface facing the first plate 41 is the
same. Then, in a region where the same poles are facing each other between the first magnet
plate 42 and the second magnet plate 52, a repulsive force is generated. The displacement of the
driving body 50 in the Z direction is constrained, while the displacement of the vibrating body 40
in the Z direction is possible by the damper 30, so the generated repulsive force causes the
vibration with the first magnet plate 42. The body 40 is displaced, and the distance between the
first magnet plate 42 and the second magnet plate 52 becomes a distance according to the
repulsive force.
[0021]
In addition, when the acoustic signal before the bias current is applied changes and the current
value of this signal reaches the maximum value, a signal having a current value of Imax is input
to the input terminal, and the solenoid 60 responds to the current value of this signal. Pin 61
moves in the negative direction of the X axis. Here, the positional relationship between the first
magnet plate 42 and the second magnet plate 52 moved by the pins 61 is as shown in FIG. 6A,
and the second magnet plate seen from the first magnet plate 42 52 is shifted by x2 in the X
direction (x2 <x1), and the area of 95% of the surface facing the second magnet plate 52 in the
first magnet plate 42 is the first magnet plate 42 in the second magnet plate 52 It is the same as
the polarity of the facing surface. And in the area | region where the same poles mutually oppose
between the 1st magnet plate 42 and the 2nd magnet plate 52, repulsive force arises, but the
same poles mutually oppose from the state of FIG.6 (b) 6B, the first magnet plate 42 is separated
from the second magnet plate 52 from the state of FIG. 6B together with the first plate 41
because the repulsive force is larger than in the case of FIG. 6B. It becomes.
[0022]
In addition, when the acoustic signal before the bias current is applied changes and the current
value of this signal becomes the minimum value, a signal having a current value of Imin is input
to the input terminal, and the solenoid 60 responds to the current value of this signal. Pin 61
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moves in the positive direction of the X axis. Here, the positional relationship between the first
magnet plate 42 and the second magnet plate 52 moved by the pins 61 is as shown in FIG. 6C,
and the second magnet plate seen from the first magnet plate 42 52 is shifted by x3 in the X
direction (x3> x1), and the area of 65% of the surface facing the second magnet plate 52 in the
first magnet plate 42 is the first magnet plate 42 in the second magnet plate 52 It is the same as
the polarity of the facing surface. And in the area | region where the same poles mutually oppose
between the 1st magnet plate 42 and the 2nd magnet plate 52, repulsive force arises, but the
same poles mutually oppose from the state of FIG.6 (b) The first magnet plate 42 is closer to the
second magnet plate 52 than the state of FIG. 6 (b) together with the first plate 41 because the
repulsive force is smaller than in the case of FIG. 6 (b). .
[0023]
As described above, in the flat speaker 1, the first magnet plate 42 is displaced in the Z direction
or the direction opposite to the Z direction in the figure in accordance with the acoustic signal.
Then, the displacement direction is sequentially changed to be a vibration, and a sound
corresponding to the vibration state (frequency, amplitude, phase) is generated from the
vibrating body 40.
[0024]
In the present embodiment, since the vibrating body 40 facing the outside is formed of metal,
there is little possibility of breakage even if an object collides with the vibrating body 40, and
there is no hindrance to the reproduction of sound. . Further, in the present embodiment, since
the entire surface of the vibrating body 40 is driven by the second magnet plate 52, split
resonance is less likely to occur in the vibrating body 40. Further, in the present embodiment,
since the magnets are regularly connected in each magnet plate, it is easy to balance the
repulsive force when the first magnet plate 42 and the second magnet plate 52 face each other,
and the vibrator 40 and It is easy to keep parallel with the driving body 50. Further, in the
present embodiment, since the first plate 41 and the second plate 52 become yokes for collecting
magnetic flux, the repulsive force of the magnetic force is increased as compared with the
configuration in which the first plate 41 and the second plate 42 are not provided.
[0025]
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[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.
[0026]
In the embodiment described above, the vibrating body 40 is displaced in the direction (in the
embodiment, the Z-axis direction) perpendicular to the displacement direction of the driving
body 50 (in the embodiment, the X-axis direction). It is not necessary to displace the driving body
50 in the vertical direction. For example, the configuration shown in FIG. 7 is an example of a
configuration in which the vibrating body 40 is not displaced in the vertical direction with
respect to the driving body 50. The driving stand 70 is a stand for moving the driving body 50,
and the support stand 71 is a stand for supporting the vibrating body 40. The fixing film 72 is a
synthetic resin film formed into a film and can be freely bent. The fixing film 72 is bonded to the
vibrating body 40 and the support base 71 to attach the vibrating body 40 to the support base
71. Further, in FIG. 7, the vibrating body 40 is fixed to the band-shaped damper 30, and the
damper 30 is fixed to the side wall 12. The driving stand 70 is fixed to the pin 61. When the
solenoid 60 operates to move the pin 61, the drive stand 70 moves along with the movement of
the pin 61.
[0027]
In FIG. 7, the first magnet plate 42 and the second magnet plate 52 face each other as in the
embodiment, and when an acoustic signal is input to the solenoid 60, the pin 61 moves to move
the driving body 50 together with the driving base 70. Do. When the drive stand 70 moves and
the size of the area where the different polarities are opposite to each other changes between the
first magnet plate 42 and the second magnet plate 52, the size of this area changes. Thus, the
repulsive force generated between the first magnet plate 42 and the second magnet plate 52
changes.
[0028]
For example, when the drive base 70 moves in the left direction in the figure and the repulsive
force generated between the first magnet plate 42 and the second magnet plate 52 becomes
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large, the fixed film 72 can be bent. 7 is displaced in the counterclockwise direction in FIG. 7 with
the fixed film 72 attached to the drive stand 70 as a center. In addition, when the drive base 70
moves in the right direction in the figure and the repulsive force generated between the first
magnet plate 42 and the second magnet plate 52 decreases, the fixed film 72 can be bent, so the
vibrator 40 7 is displaced clockwise in FIG. 7 about the side attached to the driving stand 70 by
the fixed film 72. As described above, also in the configuration shown in FIG. 7, since the
vibrating body 40 is displaced according to the acoustic signal, the vibrating body 40 generates a
sound according to the acoustic signal. In the configuration shown in FIG. 7, the vibrating film 40
may be supported by the damper 30 instead of the fixed film 72. According to this configuration,
it is possible to control the amount of displacement of the vibrating body 40 in the horizontal
direction and the vertical direction. Moreover, according to this configuration, the amplitude of
the vibrating body 40 can be made large even if the moving amount of the driving body 50 is the
same as that of the above-described embodiment. Further, in the configuration of FIG. 7, the
vibrating body 40 may be displaced in parallel with the driving body 50.
[0029]
In the present invention, the shape of the magnet 45 is not limited to a square, and may be a
rectangle, a triangle, a pentagon or more polygon, a circle or an ellipse, or the like. Further, the
number of magnets 45 constituting the first magnet plate 42 and the second magnet plate 52 is
not limited to the number of the embodiments described above, and may be less than nine or ten
or more. Further, in the embodiment described above, the plurality of magnets are fixed to each
other to constitute a magnet plate, and the magnet plate is fixed to the first plate 41 and the
second plate 51, but the magnets of the magnets are separated by a gap. It may be fixed to the
first plate 41 or the second plate 51.
[0030]
In the embodiment described above, the driving body 50 is supported by using the spring 35.
However, as long as it has elasticity, the driving body 50 may be supported by a damper or the
like which is not a spring but corrugated synthetic resin. . In addition, as a configuration for
supporting the driving body 50, flat plates disposed in parallel at a distance above and below if
the driving body 50 can be prevented from being displaced in the direction of the vibrating body
40 or in the opposite direction to the vibrating body 40. The end portion of the driving body 50
may be inserted between the two, and the driving body 50 may be supported movably in the
horizontal direction by this flat plate.
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[0031]
In the embodiment described above, the planar speaker 1 includes the first plate 41 and the
second plate 51, but the planar speaker 1 does not include both the first plate 41 and the second
plate 51, or The configuration may be such that one of the plate 41 and the second plate 51 is
not provided.
[0032]
In the embodiment described above, the first magnet plate 42 and the second magnet plate 52
are configured such that the N pole and the S pole are alternately arranged as shown in FIG. 3,
but from the direction of the Z axis The magnets 45 may be arranged such that the first row is
the N pole, the second row is the S pole, and the third row is the N pole.
[0033]
In the embodiment described above, the same poles are opposed in the opposing first magnet
plate 42 and the second magnet plate 52, but different poles are opposed and the width of the
area where different poles are opposite is an acoustic signal The driver 50 may be displaced so
as to change in accordance with the above.
According to this configuration, the suction force acting between the different poles changes, and
the vibrating body 40 is displaced to generate a sound.
[0034]
It is a schematic diagram of the external appearance of the flat speaker 1 which concerns on one
Embodiment of this invention.
FIG. 2 is a cross-sectional view of the flat loudspeaker 1; 5 is an external view of a first magnet
plate 42. FIG. FIG. 6 is a view showing a positional relationship between a first magnet plate 42
and a second magnet plate 52. FIG. 6 is a diagram illustrating an acoustic signal input to a
solenoid 60. It is a figure for demonstrating the operation | movement of the planar speaker 1.
FIG. It is sectional drawing of the modification of this invention.
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Explanation of sign
[0035]
DESCRIPTION OF SYMBOLS 1 ... Flat speaker, 10 ... Housing | casing 11, 11 ... Bottom plate, 12 ...
Side wall, 25 ... Support member, 30 ... Damper, 35 ... Spring, 40 ... Vibration Body 41: first plate
42: first magnet plate 50: driving body 51: second plate 52: second magnet plate 60: solenoid 61
иииpin
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