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JP2009260543

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DESCRIPTION JP2009260543
To reduce the weight and thickness of a speaker system. A vibrating body 10 is sandwiched
between three pairs of electrodes (electrodes 20U-1 and 20L-1, electrodes 20U-2 and 20L-2, and
electrodes 20U-3 and 20L-3). It is done. The portion between the pair of electrodes in the
vibrating body 10 vibrates according to the signal input to the input units 60-1 to 60-3, and the
electrode 20U-1 and the electrode 20L-1 and the vibrating body 10 Function as a single speaker
unit in the portion between the two, function as one speaker unit in the portion between the
electrode 20U-2 and the electrode 20L-2 and the vibrating body 10, and function as an electrode
20U-3 and an electrode 20L. The part between -3 and the vibrator 10 functions as a single
speaker unit, and as a whole functions as a speaker system in which a plurality of speaker units
are arranged. [Selected figure] Figure 4
スピーカシステム
[0001]
The present invention relates to a speaker system.
[0002]
As a system in which a plurality of speaker units are arranged, a speaker system in which a
plurality of dynamic type speaker units are arranged is well known.
However, in this speaker system, it is difficult to make the speaker system thin because the
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speaker unit is thick and it is necessary to fit the speaker unit in a deep enclosure. Further, since
a dynamic type speaker unit uses a magnet, a strong magnetic field is generated around the
speaker system using a plurality of speaker units, and if there is an electronic device in the
vicinity, the electronic device may be adversely affected. Then, the speaker system which
arranged multiple electrostatic type speakers as a thing which solves such a problem is devised
(refer patent document 1). According to this speaker system, since each electrostatic speaker
(speaker unit) is thinner than a dynamic speaker unit and does not require an enclosure with a
depth, the speaker using the dynamic speaker unit It can be thinner than the system. In addition,
since a strong magnetic field is not generated in the periphery as in a dynamic speaker unit,
there is no possibility of adversely affecting the electronic device.
[0003]
Japanese Patent Application Laid-Open No. 10-234100
[0004]
In the speaker system disclosed in Patent Document 1, a speaker system is configured by
arranging a plurality of speaker units (electrostatic speakers) in a housing.
However, in this configuration, when assembling the speaker system, it is necessary to attach the
speaker unit to the housing one by one, which takes time and effort. In addition, although the
housing needs to have rigidity in order to support a plurality of speaker units, raising the rigidity
causes the problem that the weight of the housing increases and the weight of the entire speaker
system increases.
[0005]
The present invention has been made under the above-mentioned background, and it is an object
of the present invention to provide a lightweight and thin speaker system.
[0006]
In order to solve the problems described above, the present invention has a vibrating membrane
having conductivity, and a plurality of electrode pairs having conductivity and facing each other
across the vibrating membrane, the electrode pair being an adjacent electrode Provided is a
speaker system characterized by being separated from a pair.
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[0007]
In the present invention, the vibrating membrane may be tensioned so that the propagation
velocity of the vibration wave in the vibrating membrane is less than the speed of sound in air.
Further, in the present invention, the electrode pair may be provided on the surface on the
vibrating film side of a flat plate opposite to each other with the vibrating film interposed
therebetween.
In the present invention, the vibrating film may not be tensioned. In the present invention, the
electrode pair may be a cloth having conductivity. Further, in the present invention, a member
having insulating property, elasticity, and sound transmitting property may be provided between
the vibrating membrane and the electrode of the electrode pair.
[0008]
According to the present invention, the speaker system can be made light and thin.
[0009]
Embodiment FIG. 1 is a view schematically showing the appearance of a speaker system 1
according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the
speaker system 1, and FIG. 3 is an exploded perspective view of the speaker system 1 FIG.
As shown in the figure, the speaker system 1 includes a vibrating body 10, electrodes 20U-1 to
20U-3, electrodes 20L-1 to 20L-3, and spacers 30U and 30L. In the present embodiment, since
the configurations of the spacers 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, in the present
embodiment, since the configurations of the electrodes 20U-1 to 20U-3 and the electrodes 20L-1
to 20L-3 are the same, the electrodes 20 are described as the electrodes 20 in the case where
there is no particular need to distinguish them. Also, the dimensions of the respective
components such as the vibrator and electrodes in the drawing 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
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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]
(Configuration of Each Part of Speaker System 1) First, each part constituting the speaker system
1 will be described. The vibrating body 10 is obtained by forming a conductive film of a
conductive metal on the surface of a transparent film such as PET (polyethylene terephthalate,
polyethylene terephthalate) or PP (polypropylene, polypropylene). The thickness of the vibrating
body 10 is a thin film having a thickness of about several μm to several tens of μm, and
therefore, is freely deformed when receiving an external force.
[0011]
The spacer 30 is formed of an insulator, and its shape is a square frame as shown in FIG. In the
present embodiment, the length in the X direction of the spacer 30 and the length in the X
direction of the electrode 20 are the same. Further, the heights of the spacers 30U and the
spacers 30L in the Z direction are the same.
[0012]
The electrode 20 is formed of a conductive metal in a rectangular plate shape. In the electrode
20, a plurality of through holes 21 penetrating from the front surface to the back surface of the
electrode 20 are provided at predetermined intervals in order to ensure sound transmission.
[0013]
(Structure of Speaker System 1) Next, the structure of the speaker system 1 will be described. In
the speaker system 1, the electrodes 20L-1 to 20L-3 are fixed to the lower surface of the spacer
30L at intervals so as not to contact each other, and the electrodes 20U-1 to 20U-3 are spaced
from each other so as not to contact each other. It is opened and fixed to the upper surface of the
spacer 30U. The vibrating body 10 is fixed to the upper surface of the spacer 30L, and the lower
surface of the spacer 30U is fixed on the vibrating body 10.
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[0014]
In the present embodiment, the vibrating body 10 is fixed between the frames of the spacer 30U
and the spacer 30L in a tensioned state so as not to cause slack. In addition, the electrodes 20U-1
to 20U-3 are fixed to the spacer 30U such that the long sides thereof are parallel to each other.
Further, the electrode 20L-1 is fixed to the spacer 30L so that the long side is parallel to the long
side of the electrode 20U-1 with the vibrating body 10 interposed therebetween, and the
electrode 20L-2 is The vibrating body 10 is opposed to the electrode 20U-2 so that the long side
is parallel to the long side of the electrode 20U-2 and fixed to the spacer 30L. The electrode 20L3 sandwiches the vibrating body 10 It is fixed to the spacer 30L so as to face the electrode 20U-3
and to make the long side parallel to the long side of the electrode 20U-3.
[0015]
Electrical Configuration of Speaker System 1 Next, the electrical configuration of the speaker
system 1 will be described. FIG. 4 is a diagram showing an electrical configuration of the speaker
system 1. As shown in FIG. 4, the speaker system 1 applies a DC bias to the transformers 50-1 to
50-3, the input parts 60-1 to 60-3 to which an acoustic signal is input from the outside, and the
vibrator 10. And a bias power supply 70.
[0016]
In the present embodiment, the bias power supply 70 is connected to the conductive film of the
vibrating body 10 and the middle point on the output side of the transformers 50-1 to 50-3.
Moreover, one end of the output side of the transformer 50-1 is connected to the electrode 20U1, and the other end is connected to the electrode 20L-1 facing the electrode 20U-1. The input
side of the transformer 50-1 is connected to the input unit 60-1, and when an acoustic signal is
input to the input unit 60-1, the voltage according to the acoustic signal becomes the electrode
20U-1 and the electrode 20L-. Applied to one. Moreover, one end of the output side of the
transformer 50-2 is connected to the electrode 20U-2, and the other end is connected to the
electrode 20L-2 facing the electrode 20U-2. Then, the input side of the transformer 50-2 is
connected to the input unit 60-2, and when an acoustic signal is input to the input unit 60-2, the
voltage according to the acoustic signal becomes the electrode 20U-2 and the electrode 20L- 2 is
applied. Also, one end of the output side of the transformer 50-3 is connected to the electrode
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20U-3, and the other end is connected to the electrode 20L-3 facing the electrode 20U-3. The
input side of the transformer 50-3 is connected to the input unit 60-3, and when an acoustic
signal is input to the input unit 60-3, a voltage corresponding to the input acoustic signal is the
electrode 20U-3 and The voltage is applied to the electrode 20L-3.
[0017]
(Operation of Speaker System 1) Next, the operation of the speaker system 1 will be described.
Between the electrode 20U-1 and the electrode 20L-1 facing each other by the voltage applied
from the transformer, between the electrode 20U-2 facing the electrode 20L-2 and the electrode
20U-3 facing the electrode 20L-3 When a potential difference is generated between them, an
electrostatic force that pulls the vibrating body 10 in the Z direction side or in the direction
opposite to the Z direction (−Z direction) acts on the vibrating body 10.
[0018]
For example, when an acoustic signal is input to the input unit 60-1, a positive voltage is applied
to the electrode 20U-1, and a negative voltage is applied to the electrode 20L-1, a bias power
supply is applied to the conductive film of the vibrating body 10 Since a positive voltage is
applied by 70, in the portion between the electrode 20U-1 and the electrode 20L-1 in the
vibrator 10 (hereinafter referred to as the first portion), an electrode to which a positive voltage
is applied is provided. While being repelled from 20U-1, it is attracted to the electrode 20L-1 to
which a negative voltage is applied, and is displaced toward the electrode 20L-1. On the other
hand, when an acoustic signal is input to the input unit 60-1, a negative voltage is applied to the
electrode 20U-1, and a positive voltage is applied to the electrode 20L-1, a positive voltage is
applied to the first portion. While being repelled from the electrode 20L-1, the negative voltage is
attracted to the electrode 20U-1 to which a negative voltage is applied, and the electrode 20U-1
is displaced toward the electrode 20U-1.
[0019]
When an acoustic signal is input to the input unit 60-2, a potential difference is generated
between the electrode 20U-2 and the electrode 20L-2 in accordance with the acoustic signal, and
the electrode 20U-2 and the electrode 20L-2 in the vibrator 10 And the portion between them
(hereinafter referred to as the second portion) is displaced in the Z direction or the -Z direction
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according to this potential difference as in the first portion. In addition, when an acoustic signal
is input to the input unit 60-3, a potential difference is generated between the electrode 20U-3
and the electrode 20L-3 according to the acoustic signal, and the electrode 20U-3 and the
electrode 20L-3 in the vibrator 10 And the portion between them (hereinafter referred to as the
third portion) is displaced in the Z direction or the -Z direction according to this potential
difference as in the first portion.
[0020]
Thus, the vibrating body 10 is displaced according to the acoustic signal (deflection), and the
displacement direction is sequentially changed to become vibration, and a sound corresponding
to the vibrating state (frequency, amplitude, phase) is transmitted from the vibrating body 10
Occur. The generated sound passes through at least one of the electrodes 20U-1 to 20U-3 or the
electrodes 20L-1 to 20L-3 and is emitted to the outside of the speaker system 1.
[0021]
Here, in the speaker system 1, mutually different signals can be input for the signals input to the
input units 60-1 to 60-3. Then, the potential difference between the electrode 20U-1 and the
electrode 20L-1, the potential difference between the electrode 20U-2 and the electrode 20L-2,
and the potential difference between the electrode 20U-3 and the electrode 20L-3 It can be
different, which can generate different sounds in the first part, the second part and the third part.
That is, the electrode 20U-1 and the electrode 20L-1 and the first portion function as one
speaker unit, the electrode 20U-2 and the electrode 20L-2 and the second portion function as
one speaker unit, and the electrode 20U-3 And the electrode 20L-3 and the third portion
function as one speaker unit, and function as a speaker system in which a plurality of speaker
units are arranged in total.
[0022]
In the known speaker system, the directivity of the sound generated from the speaker system can
be obtained by delaying the signals supplied to each of the plurality of speaker units and varying
the delay amount of the signals supplied to each speaker unit. Control is being done. Also in the
present embodiment, when the delay amount of each signal input to the input units 60-1 to 60-3
is made different, the sound corresponding to the delay amount is obtained from each portion of
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the first portion, the second portion and the third portion. It is possible to control the directivity
of the sound generated and generated from the speaker system 1.
[0023]
Further, in a configuration in which a plurality of speaker units (electrostatic speakers) are
arranged to obtain a speaker system as in the speaker system disclosed in Patent Document 1, a
housing having rigidity for fixing the plurality of speaker units This makes it possible to obtain a
speaker system in which a plurality of speaker units are arranged by one vibrating body 10,
according to the present embodiment. Since it is not necessary to arrange a plurality of speaker
units as in the speaker system disclosed in No. 1, the housing as in Patent Document 1 is not
necessary, and the weight can be reduced accordingly. Further, in the present embodiment, since
a speaker system in which a plurality of speaker units are arranged by one vibrating body 10 can
be obtained, compared with the speaker system of Patent Document 1, there is no need to attach
the speaker unit to the housing , Easy to assemble.
[0024]
[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 electrodes 20U-1 to 20U-3 are fixed to the spacer 30U
at intervals so as not to contact each other, but an insulator is disposed between the electrodes
and the adjacent electrodes are in contact with each other You may not do. Similarly, with regard
to the electrodes 20L-1 to 20L-3, insulators may be disposed between the electrodes so that the
electrodes do not contact each other.
[0026]
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In the embodiment described above, the electrode 20 is formed of a conductive metal, but may
be a cloth in which a conductive yarn is woven. Note that, in a configuration in which a cloth
obtained by weaving a conductive yarn is used as the electrode 20, a member having insulation,
elasticity, and acoustic transparency is disposed between the electrode 20 and the vibrator 10,
and the vibrator 10 is used. You do not have to put tension on the In addition, the member
disposed between the electrode 20 and the vibrating body 10 may be in the form of a sponge, a
sheet, a non-woven fabric, etc. as long as it is formed of a material having insulation, elasticity
and sound transmission. It can be taken. Further, in this configuration, the spacer 30 may be
flexible or may not be disposed. According to this configuration, the speaker system 1 can be
freely deformed, for example, curved or bent.
[0027]
The propagation velocity v of the vibration wave in the vibrating body 10 is S [kg / cm] for the
tension of the vibrating body 10, g [cm / s <2>] for gravitational acceleration, and σ [kg / s] for
the surface density of the vibrating body 10 Assuming that cm <2>], it is represented by the
following equation.
[0028]
According to this equation, it can be understood that the propagation velocity v becomes faster
as the tension of the vibrator 10 is increased.
However, if the propagation velocity v is greater than the speed of sound in air, in the first part,
the second part and the third part, the independent vibration of each part is maintained under
the influence of the vibration from the other adjacent parts. And the acoustic characteristics of
the sound generated from each part deteriorate. For this reason, when applying tension to the
vibrating body 10, it is preferable to obtain tension from the above equation and apply the
obtained tension so that the propagation velocity v is less than the speed of sound in air. In order
to fix the vibrating body 10 to the spacer 30 while applying tension to the vibrating body 10,
after bonding the vibrating body 10 to one side of the spacer 30, the tension applied to the
vibrating body 10 becomes the tension obtained from the above equation. Thus, there is a
method of pulling the vibrating body 10 with a weight or a spring and bonding the vibrating
body 10 under tension to the spacer 30. When the vibrator 10 is fixed to the spacer 30, an
ultraviolet curing adhesive may be used, and ultraviolet rays may be irradiated to cure the
adhesive so that the vibrator 10 is bonded to the spacer 30. Further, as a method of applying
tension to the vibrating body 10, the vibrating body 10 is attached to a rectangular frame larger
than the spacer 30, and the tension applied to the vibrating body 10 is obtained from the above
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equation. The vibrating body 10 may be bonded to the spacer 30 by pressing the vibrating body
10 so as to obtain a high tension. Further, as disclosed in FIG. 1 of Japanese Patent Application
Laid-Open No. 59-105800, tension may be applied to the vibrating body 10 by depressing the
periphery of the vibrating body stretched on the convex portion. Also, in order to set the
propagation velocity v to less than the velocity of sound in air, if the tension is determined in
advance, the surface density is determined from the above equation so that the velocity of
propagation v becomes smaller than the velocity of sound in air. The vibrator may be formed on
[0029]
In the embodiment described above, a pair of electrodes such as the electrode 20U-1 and the
electrode 20L-1, the electrode 20U-2 and the electrode 20L-2, and the electrode 20U-3 and the
electrode 20L-3 sandwiching the vibration body 10 Although three are arranged, the number of
electrode pairs is not limited to three. For example, as shown in FIG. 5, the electrodes 20 are
arranged in a plurality of rows in the X direction and the Y direction in the drawing (the
electrodes 20U-11 to 20U-16 and the electrodes 20L-11 to 20L-16 are arranged). The number of
pairs of the electrodes 20 sandwiching the vibrator 10 may be four or more.
[0030]
In the embodiment described above, although a plurality of speaker units are provided by
arranging a plurality of electrodes 20 with the vibrating body 10 interposed therebetween, the
speaker unit may be configured by another method. FIG. 6 is a perspective view of a fixed pole
25 according to a modification of the present invention. The fixed electrode 25 is composed of a
substrate 26 and conductive layers 27-1 to 27-3. The substrate 26 is formed of an insulating
material (for example, glass or phenol resin), and its shape is rectangular and plate-like. The
conductive layers 27-1 to 27-3 are layers of conductive metal. Each conductive layer has a
rectangular shape, and is provided parallel to the surface of the substrate 26 at intervals to
function as an electrode.
[0031]
When the fixed electrode 25 is used, the fixed electrode 25 is fixed to the upper surface of the
spacer 30U and the lower surface of the spacer 30L instead of the electrodes 20U-1 to 20U-3
and the electrodes 20L-1 to 20L-3. Each fixed pole 25 is fixed to the spacer 30 with the
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conductive layer side facing the vibrating body 10, and the conductive layer 27-1 of the fixed
pole 25 fixed to the spacer 30U and the fixed pole 25 fixed to the spacer 30L. Conductive layer
27-1 of fixed pole 25 fixed to spacer 30U and conductive layer 27-2 of fixed pole 25 fixed to
spacer 30L opposed to each other, spacer 30U The conductive layer 27-3 of the fixed pole 25
fixed to the electrode 30 is fixed so as to face the conductive layer 27-3 of the fixed pole 25 fixed
to the spacer 30L. The conductive layer 27-1 is connected to the transformer 50-1, the
conductive layer 27-2 is connected to the transformer 50-2, and the conductive layer 27-3 is
connected to the transformer 50-3. .
[0032]
Also in this configuration, the conductive layer 27-1 on the spacer 30U side, the conductive layer
27-1 on the spacer 30L side, and the portion of the vibrating body 10 between the two
conductive layers function as one speaker unit. The conductive layer 27-2 on the spacer 30U side
and the conductive layer 27-2 on the spacer 30L side, and the portion of the vibrator 10 between
the two conductive layers, the conductive layer 27-3 on the spacer 30U side, and the spacer The
conductive layer 27-3 on the 30L side and the portion between the two conductive layers in the
vibrator 10 also function as one speaker unit. That is, even when the fixed pole 25 is used, a
speaker system in which a plurality of speaker units are arranged can be obtained.
[0033]
In the present invention, the shape of the electrode 20 is not limited to a rectangle, and may be
another shape such as a polygon, a circle, or an ellipse. In addition, the shape of the conductive
film to be disposed in the fixed pole 25 may be another shape such as a polygon, a circle, or an
ellipse.
[0034]
FIG. 1 is an external view of a speaker system 1 according to an embodiment of the present
invention. FIG. 1 is a cross-sectional view of a speaker system 1; FIG. 2 is an exploded perspective
view of the speaker system 1; FIG. 2 is a diagram showing an electrical configuration of the
speaker system 1; It is an exploded perspective view of a speaker system concerning a
modification of the present invention. It is a perspective view of the electrode concerning the
modification of the present invention.
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Explanation of sign
[0035]
DESCRIPTION OF SYMBOLS 1 ... Speaker system, 10 ... Vibrator, 20U-1-20U-3, 20L-1-20L-3 ...
Electrode, 25 ... Fixed pole, 26 ... Board | substrate, 27-1 27 27-3 ... conductive layer, 30 U, 30 L
... spacer, 50-1 to 50-3 ... transformer, 60-1 to 60-3 ... input part, 70 ... bias power supply
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