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JP2009111565

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DESCRIPTION JP2009111565
To reduce the risk of a short circuit or an electric shock in a speaker provided with a planar
vibrator, and to reduce the weight. A vibrator 10 having a plurality of coils formed in a spiral
wiring pattern on its surface is disposed between a ferromagnetic cloth 20U and a non-magnetic
cloth 20L. Elastic members 30U and 30L are disposed between the cloths 20U and 20L. When
the amplitude of the acoustic signal flowing through the coil becomes positive, the magnetic field
generated around the coil becomes strong, and the vibrating body 10 is pulled toward the
ferromagnetic cloth 20U and displaced in the A direction. On the other hand, when the amplitude
of the acoustic signal becomes negative, the magnetic field generated around the coil becomes
weak. Then, the force by which the vibrating body 10 is pulled toward the cloth 20U becomes
weak, and the vibrating body 10 is displaced in the B direction by the force that the elastic
member 30U tries to return to the original shape. Since the coil on the vibrating body 10 through
which current flows is not exposed to any of the front and back, there is little risk of short circuit
or electric shock. [Selected figure] Figure 5
Flat speaker
[0001]
The present invention relates to a planar speaker.
[0002]
As a flat type speaker, there is a speaker called an electrostatic type speaker.
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This electrostatic speaker is composed of two electrodes facing each other at an interval and a
sheet-like vibrator having conductivity inserted between the two electrodes. When a
predetermined bias voltage is applied to the vibrating body and the voltage applied to the
electrode is changed, the electrostatic force acting on the vibrating body is changed, and thereby
the vibrating body is displaced. If the applied voltage is changed according to the input acoustic
signal, the vibrator repeats displacement (i.e. vibrates) according to the change of the acoustic
signal, and a sound corresponding to the acoustic signal is generated from the speaker. Further,
as a flat type speaker, there is a flat speaker disclosed in Patent Document 1. The flat speaker has
a diaphragm and a plurality of permanent magnets, and a plurality of coils are arranged in a
spiral on both sides of the diaphragm. In addition, a permanent magnet is disposed at a
predetermined distance from the coil so as to face the coil, and when a current is supplied to the
coil, a surface on which the coil is disposed on the vibrating membrane according to Fleming's
left hand rule. A force acts in the vertical direction to displace the diaphragm. 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]
Now, in the electrostatic type speaker, the electrode sandwiching the vibrating body is the front /
back of the speaker.
When displacing the vibrator in an electrostatic speaker, it is necessary to apply a high voltage to
the two electrodes to which a voltage is applied. In addition to the above, it is necessary to devise
a device to prevent the danger such as a short circuit when an object collides, since the portion to
which the voltage is applied becomes a surface. In the flat speaker disclosed in Patent Document
1, the coil surface is coated with an insulating resin so that the coil through which the current
flows is not exposed. The thing is done. However, if the portion where current flows is on the
surface, the coating may be broken due to a collision with an object or person, and it is difficult
to completely eliminate the possibility of short circuit. Further, in the flat speaker disclosed in
Patent Document 1, a magnet is required to vibrate the vibrating film, which causes a problem of
increased weight.
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[0005]
The present invention has been made under the above-described background, and it is an object
of the present invention to reduce the risk of short circuit and electric shock and provide a
lightweight speaker in a speaker provided with a planar vibrating body.
[0006]
In order to solve the problems described above, according to the present invention, there is
provided a planar first member having magnetism and acoustic transparency, and a planar
second member which is nonmagnetic and is disposed to face the first member at a distance. A
vibrator which is planar and has a planar coil to which an acoustic signal is supplied on one
surface, and the planar coil side is directed to the first member and positioned between the first
member and the second member And a first elastic member positioned between the vibrator and
the first member and having insulation, elasticity, and acoustic transparency, and is positioned
between the vibrator and the second member, and insulating A planar speaker comprising: and a
second elastic member having elasticity and sound transmission.
[0007]
In the present invention, the first member, the first elastic member, the vibrator, the second
elastic member and the second member may be sewn together with a thread.
Further, in the present invention, the first member and the second member may be cloth-like.
Further, in the present invention, the vibrator may have a plurality of the planar coils, and the
planar coils may have a spiral shape, and winding directions of the planar coils may be the same.
Further, in the present invention, a voltage superposition means may be provided for
superposing a predetermined bias voltage on the acoustic signal supplied to the planar coil.
[0008]
According to the present invention, it is possible to reduce the risk of short circuit and electric
shock and to reduce the weight of a speaker provided with a planar vibrating body.
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[0009]
FIG. 1 is a view schematically showing the appearance of a planar speaker 1 according to an
embodiment of the present invention, and FIG. 2 is a view schematically showing a cross section
of the planar speaker 1.
As shown in the figure, this planar speaker 1 is composed of a vibrating body 10, cloths 20U and
20L, elastic members 30U and 30L, and a thread 40. In the present embodiment, since the
configurations of the elastic members 30U and 30L are the same, the descriptions of "L" and "U"
will be omitted unless there is a need to distinguish between the two. Further, the dimensions of
the respective components such as the vibrator 10, the cloths 20U and 20L, the elastic member
30 and the like in the drawing are made 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.
[0010]
(Structure of Each Part of Flat Speaker 1) The cloth 20U is a ferromagnetic cloth in which an
electroless nickel-plated warp and a electroless nickel-plated weft are plain-woven. The cloth 20U
has a rectangular shape and is plain weaved to allow passage of air, so that the sound
transmission is secured. The cloth 20L is a non-magnetic cloth obtained by plain-weaving a warp
and a weft such as cotton having no conductivity. The cloth 20 </ b> L also has a rectangular
shape and is plain weaved to allow passage of air, so that the sound transmission is secured. The
yarn 40 is a yarn for sewing together the cloth 20U, the cloth 20L, the elastic member 30, and
the vibrator 10, and the material thereof is a material having no conductivity such as cotton.
[0011]
The elastic member 30 is formed by applying heat and compression to the batt to allow passage
of air, and its shape is rectangular. The elastic member 30 deforms when an external force is
applied, and returns to its original shape when the external force is removed. In the present
embodiment, the heights of the elastic member 30U and the elastic member 30L in the Z
direction are the same.
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[0012]
The vibrating body 10 is formed by depositing aluminum on the surface of a film-like film 11
formed of PET (polyethylene terephthalate), and then forming an aluminum wiring on the film 11
by etching. In the present embodiment, the thickness of the film 11 is 12 ?m, and the thickness
of the deposited aluminum is 25 ?m, but the thickness of PET or aluminum is not limited to this
thickness. Other thicknesses may be used.
[0013]
FIG. 3 is a view schematically showing a wiring pattern of aluminum in the vibrator 10. As shown
in FIG. A wiring pattern is formed in a spiral form from the outside to the inside in a clockwise
direction on one surface of the film 11, and coils 12-1 to 12-9 are formed in 3 rows and 3
columns (hereinafter referred to as film 11). The surface on which the coils 12-1 to 12-9 are
formed is called the front surface, and the surface on which the coils 12-1 to 12-9 are not formed
is called the back surface). In addition, in the film 11, through holes 13-1 to 13-18 which
penetrate the film 11 and have conductivity are provided. Further, as shown in FIG. 3, on the film
11, input ends 14A and 14B to which an acoustic signal is input are provided. Between the input
ends 14A to 14B, coils 12-1 to 12- are provided. 9, through holes 13-1 to 13-18, which are
connected on the back side in a one-stroke manner via a wiring pattern for connecting the
through holes.
[0014]
Specifically, the inner end of the coil with a branch number n and the outer end of the coil with a
branch number n + 1 are connected to the inner end of the coil with a branch number n and the
outer side of the coil with a branch number n + 1 It connects by the through-hole connected with
an edge part, and the wiring pattern of the back surface which connects these through-holes. For
example, the wiring pattern extending from the input end 14A is spirally formed from the outside
to the inside in the clockwise direction to form the coil 12-1, and reaches the through hole 13-1
after being two and a half turns. The through holes 13-1 communicate with the back surface side
of the film 11, and on the back surface side, a pattern connecting the through holes 13-2
adjacent to the through holes 13-1 is formed. The through hole 13-2 is connected to the outer
end of the coil 12-2 adjacent to the coil 12-1, and the coil 12-1 and the coil 12-2 are through
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holes 13-1, through holes 13-2, and through It connects by the wiring pattern which connects
the hole 13-1 and the through hole 13-2.
[0015]
Similarly, in the other coils, the coils are connected to each other through the through holes and
the wiring pattern on the back surface side. The inner end of the coil 12-9 is connected to the
through hole 13-18 through the through hole 13-17 and the wiring pattern on the back surface,
and the through hole 13-18 is connected to the input end 14B, There is a one-stroke connection
between the input end 14A and the input end 14B.
[0016]
(Method of assembling the planar speaker 1) Next, a method of assembling the planar speaker 1
will be described. When assembling the planar speaker 1, first, the elastic member 30L is placed
on the cloth 20L. Next, after the vibrating body 10 is placed on the elastic member 30L and the
elastic member 30U is placed on the vibrating body 10, the cloth 20U is placed on the elastic
member 30U. Then, after the cloth 20U, the cloth 20L, the vibrator 10 and the elastic member
30 have been stacked, the respective members are sewn together with the thread 40 having no
conductivity. As shown in FIG. 1, the members are sewn together and restrained by the thread 40
penetrating each member, so that the cloths 20U and 20L, the elastic member 30, and the
vibrator 10 do not shift even if deformed. In the present embodiment, when the members are
sewn together with the thread 40, it is preferable to sew the vibrator 10 so that the area where
the aluminum wiring pattern is formed is separated.
[0017]
Next, the operation of the planar speaker 1 will be described. The vibrator 10 is provided with
input terminals 14A and 14B to which an acoustic signal is input from the outside, and a
predetermined bias voltage is superimposed on the input terminals. And an acoustic signal is
superimposed on this bias voltage and is input. Specifically, as shown in FIG. 4 (a), when an
acoustic signal having positive and negative amplitudes is input, as shown in FIG. 4 (b), the
amplitude on the negative side should not fall below 0 V. A predetermined bias voltage is
superimposed on the acoustic signal.
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[0018]
When the acoustic signal shown in FIG. 4B is externally supplied to the input terminal 14A, the
supplied acoustic signal passes through the coils 12-1 to 12-9. FIG. 5 is a figure for
demonstrating an effect | action when an acoustic signal passes a coil. In the same figure, the one
in which ?и? is described in the cross section of the wiring of the coil means that the current
flows from the back to the front of the drawing, and ?x? is described in the cross section of the
coil. What is meant is that current flows from the front to the back of the drawing.
[0019]
First, in the state where there is no amplitude of the acoustic signal and only the bias voltage is
applied from the input end, as shown by the two-dot chain line in FIG. Occur. In addition, the
arrow on a dashed-two dotted line in FIG. 5 represents the direction of the magnetic field. Here,
in the vicinity of the coil, there is a cloth 20U having ferromagnetism sandwiching the elastic
member 30U, and when a magnetic field is generated around the coil, the cloth 20U receives a
force to be pulled to the coil side. However, comparing the mass of the cloth 20U and the
vibrator 10, the cloth 20U formed by weaving the plated yarn is heavier than the membrane-like
vibrator 10, so here, the vibrator 10 is on the cloth 20U side. The elastic member 30U between
the vibrator 10 and the cloth 20U is compressed. Then, in the elastic member 30U, when
compressed, a force acts to return to the original shape, and when this force and the force with
which the vibrating body 10 is pulled toward the cloth 20U are balanced, the vibrating body 10
comes to a standstill.
[0020]
Next, when the amplitude becomes positive in the acoustic signal before the bias voltage is
superimposed and the current passing through the coil increases, the magnetic field generated
around the coil compared to when only the bias voltage is applied to the coil Becomes stronger.
Then, the vibrator 10 is further pulled toward the cloth 20U from the state where only the bias
voltage is applied, and is displaced in the arrow A direction in FIG.
[0021]
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On the other hand, when the amplitude becomes negative in the acoustic signal before the bias
voltage is superimposed and the current passing through the coil decreases, the magnetic field
generated around the coil is lower than when only the bias voltage is applied to the coil. become
weak. Then, compared to the state where only the bias voltage is applied, the force with which
the vibrating body 10 is pulled toward the cloth 20U becomes weak, and the vibrating body 10 is
forced to return the compressed elastic member 30U to its original shape. Is displaced to the
cloth 20L side (arrow B direction).
[0022]
Thus, in the planar speaker 1, the strength of the magnetic field around the coils 12-1 to 12-9
changes according to the acoustic signal, and the vibrating body 10 is the cloth 20 U or the cloth
20 L according to the strength of the magnetic field. Displace in the direction of 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 passes through at least one of
the cloth 20U and the cloth 20L and is radiated to the outside of the planar speaker 1.
[0023]
In the present embodiment, since the portion through which the current flows is not exposed on
the front or back, there is little risk of short circuit or electric shock. Further, in the present
embodiment, since the vibrating body 10, the cloths 20U and 20L and the elastic member 30
constituting the planar speaker 1 are restrained by the thread 40, the shape and the structure
are obtained even if the planar speaker 1 is deformed. The cloths 20U and 20L, the elastic
member 30, and the vibrator 10 do not shift without collapsing. In addition, since the vibrating
body 10, the cloths 20U and 20L and the elastic member 30 have flexibility, they can be
deformed in an arc shape, can be deformed along a curved surface, or can be freely deformed,
and can be attached to clothes it can. Further, since each member is flexible, there is no risk of
damaging the human body even if the human body collides. For this reason, if attached to a
headrest or disposed inside a full-faced helmet, it is possible to produce sound at the ear without
damaging the human body.
[0024]
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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.
[0025]
In the embodiment described above, the vibrating body 10 is formed of a film of PET and a
wiring pattern of aluminum, but the material of the film is not limited to PET, and may be
another polymer material such as polyimide. It is also good. Further, the wiring pattern in the
vibrator 10 may be formed of other conductive metal such as copper instead of aluminum.
[0026]
In the embodiment described above, although the wiring pattern forms the coil by two and a half
turns, the number of turns of the wiring pattern of the coil is not limited to two and a half and
may be more than two and a half. . Moreover, in the embodiment described above, the number of
coils is nine, but the number of coils is not limited to nine, and may be eight or less, or ten or
more. . Further, the arrangement of the coils is not limited to three rows and three columns, and
may be m rows and n columns, and the values of m and n may be arbitrarily selected. In the
present embodiment, it is more preferable to reduce the outer diameter of each coil to increase
the number of coils than to increase the outer diameter of each coil to reduce the number of
coils. Further, in the embodiment described above, the shape of each coil is square when viewed
from the Z direction, but may be a shape other than a square, such as a circle or an oval.
[0027]
In the embodiment described above, the adjacent coils are connected by the through hole and the
wiring pattern on the back surface side, but the method of connecting the adjacent coils is not
limited to the method of the embodiment described above . For example, the surface of the film
11 is coated with an insulating material, leaving the outer end and the inner end of the coil, and
the exposed outer end and the inner end of the coil are connected by a jumper wire. May be
connected.
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[0028]
In the embodiment described above, the elastic member 30 is a batt, but it may be another
member as long as it is elastic and acoustically transparent. Furthermore, in the above-described
embodiment, the members of the planar speaker 1 are sewn together by the thread 40, but in the
case where they are not bent, the members may not be sewn with the thread 40 but may be
overlapped. .
[0029]
In the embodiment described above, the bias voltage to be superimposed on the sound signal
may be made variable by the user by operating the operation element. Further, in the abovedescribed embodiment, although the acoustic signal on which the bias voltage is superimposed is
supplied to the coils 12-1 to 12-9, the planar speaker 1 is provided with a bias power source that
superimposes a predetermined voltage on the acoustic signal. May be Then, as shown in FIG. 4A,
acoustic signals with positive and negative amplitudes are input to the planar speaker 1, and the
bias power supply provided to the planar speaker 1 superposes a bias voltage on the input
acoustic signals. Alternatively, an acoustic signal on which a bias power source is superimposed
may be supplied to the coils 12-1 to 12-9. In the embodiment described above, the cloth 20U and
the cloth 20L sandwich the vibrating body 10, but if it has ferromagnetism, the cloth 20U may be
replaced by another member such as a metal panel. In addition, when using a metal panel, it is
preferable to provide multiple holes which penetrate a metal panel, in order to ensure sound
transmittance. Further, the cloth 20L may be replaced with the cloth 20L to be another member
such as a synthetic resin panel as long as the cloth 20L does not have magnetism.
[0030]
It is a schematic diagram of the external appearance of the planar speaker 1 which concerns on
one Embodiment of this invention. It is sectional drawing of the planar speaker 1 which concerns
on the embodiment. FIG. 5 is a schematic view of a wiring pattern in a vibrating body 10; FIG. 3
is a diagram illustrating an acoustic signal input to the planar speaker 1; It is a figure for
demonstrating the effect | action of the planar speaker 1. FIG.
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Explanation of sign
[0031]
DESCRIPTION OF SYMBOLS 1 ... planar speaker, 10 ... vibrator, 11 ... film, 12-1-12-9 ... coil, 13-113-18 ... through hole, 14A, 14B .. и и Input end, 20 U иии Fabric, 20 L иии Fabric, 30 иии Elastic
member, 40 иии Thread
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