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JP2010118909

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DESCRIPTION JP2010118909
The present invention provides a speaker device capable of switching the directivity and nondirectivity of sound waves to be output with a simple configuration as compared with the prior
art. A planar speaker 1 emits a planar acoustic wave. The slit structure 2 is provided at a position
covering the sound emitting surface of the flat speaker 1. The slit structure 2 is constituted by
the slit plates 2a and 2b, and by moving the slit plate 2a in the direction orthogonal to the sound
emission direction of the flat speaker 1, the slit width of the slit structure 2 becomes variable.
There is. The control unit 3 changes the slit width of the slit structure 2 in accordance with the
signal output from the switch 6. When the slit width is shorter than the minimum wavelength of
the sound wave emitted from the flat speaker 1, the sound wave emitted from the flat speaker 1
is emitted as a spherical wave. On the other hand, when the slit width is longer than the
minimum wavelength of the sound wave emitted from the flat speaker 1, a part of the sound
wave emitted from the flat speaker 1 is emitted as the plane wave. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
Conventionally, flat speakers and spherical speakers are used as speakers.
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Since the flat speaker outputs a plane wave, it has strong directivity and has a characteristic that
the device can be thin and light. In addition, the flat speaker has a characteristic that the volume
does not change even if the distance from the speaker is close or far, and the user does not get
tired when listening long. However, when using a directional speaker device, there is a
disadvantage that the sound can not reach an unspecified number.
[0003]
On the other hand, since a spherical speaker outputs a spherical wave, it is omnidirectional and
can deliver sound to an unspecified number. However, spherical speakers have the characteristic
that the device can not be made thin. Moreover, when using a nondirectional speaker, the sound
may reach anyone, and the sound emitted from the speaker may be noise.
[0004]
A speaker device capable of producing both directional and omnidirectional sounds has also been
developed (see Non-Patent Document 1). Further, Patent Document 1 proposes a technique for
efficiently diffusing directivity by installing an acoustic lens device having a hole in front of a
cone paper of a spherical speaker. Further, Patent Document 2 proposes a technology for
realizing wide directivity by installing a focusing member on the front surface of a spherical
speaker. Further, Patent Document 3 proposes a technique for producing a directional sound by
installing a sound absorbing panel in parallel with the radial direction. JP-A 08-331684 JP-A
2004-193749 JP-A 02-239797
“http://www.hibino.co.jp/proaudiosales/product/nexo/rs/rs15.html”
[0005]
It is convenient if it is possible to switch and output a directional sound wave and a nondirectional sound wave as in the speaker device described in the above-mentioned Non-Patent
Document 1. However, the speaker device described in Non-Patent Document 1 has a
complicated device configuration, and the device becomes large. The present invention has been
made in view of the above-described background, and it is an object of the present invention to
provide a speaker device capable of switching the directivity and non-directivity of sound waves
to be output with a simple configuration as compared with the prior art. .
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[0006]
In order to solve the above problems, the present invention provides a flat speaker emitting flat
sound waves, a slit structure covering a sound emitting surface of the flat speaker, and having a
variable slit width, and the slit width of the slit structure. And a slit width control means for
changing
[0007]
In a preferred aspect of the present invention, the slit structure may be capable of changing
whether or not the slit width is larger than the minimum wavelength of the sound wave emitted
from the flat speaker.
[0008]
Further, in a further preferable aspect of the present invention, the slit width control means may
change the slit width of the slit structure in accordance with a signal output from an operation
means operated by a user.
[0009]
In another preferred embodiment of the present invention, the flat speaker further comprises an
input terminal to which an audio signal is input, and frequency detection means for detecting the
frequency of the audio signal input to the input terminal; A sound wave may be emitted
according to an audio signal input to a terminal, and the slit width control unit may change the
slit width of the slit structure according to the frequency detected by the frequency detection
unit.
[0010]
Further, in a further preferable aspect of the present invention, the slit structure is provided at a
first slit plate fixed at a position covering the sound emitting surface of the flat speaker, and at a
position covering the sound emitting surface of the flat speaker The slit width may be changed
by moving a second slit plate that is movable in a direction orthogonal to the sound emission
direction of the flat speaker, and the second slit plate moves.
[0011]
In another preferred embodiment of the present invention, the wavelength of the input terminal
to which an audio signal is input and the audio signal input to the input terminal is shorter than
the maximum value of the slit width of the slit structure. And the flat speaker may emit the sound
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wave according to the voice signal supplied from the voice signal converting means.
[0012]
According to the present invention, the directivity and non-directivity of the sound wave to be
output can be switched with a simple configuration as compared with the prior art.
[0013]
<Configuration> FIG. 1 is a diagram showing an example of a configuration of a speaker device
100 according to an embodiment of the present invention.
In the figure, a planar speaker 1 is a speaker for outputting a sound wave of a plane wave, and
outputs a sound wave of a plane wave in the direction of arrow A in the figure.
The flat speaker 1 is, for example, an electrostatic speaker.
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.
In this embodiment, an electrostatic speaker is used as the flat speaker, but the flat speaker is not
limited to the electrostatic speaker, and may be another type of speaker such as an
electromagnetic speaker.
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[0014]
The slit structure 2 is provided apart from the flat speaker 1 at a position in the direction in
which the sound emitting surface of the flat speaker 1 is covered.
The slit structure 2 is composed of a slit plate 2a and a slit plate 2b. In the slit plates 2a and 2b, a
plurality of gaps (slits) having a width L1 are formed at equal intervals. The slit plate 2 b is fixed
at a position covering the sound emitting surface of the flat speaker 1. On the other hand, the slit
plate 2a is movable in the direction of arrow B in the figure (the direction orthogonal to the
sound emitting direction of the flat speaker 1). The slit width L of the slit structure 2 is variable
by moving the slit plate 2 a in the arrow B direction. Specifically, for example, as the slit plate 2a
moves in the left direction in the drawing, the slit width L decreases. On the other hand, the slit
width L becomes larger as the slit plate 2a moves to the right in the drawing. Thus, the slit width
L of the slit structure 2 is variable in the range from zero to L1 according to the position of the
slit plate 2a.
[0015]
The slit width L1 of the slit plates 2a and 2b is designed in advance to be larger than the
minimum wavelength of the sound wave emitted from the flat speaker 1. Therefore, the slit width
L of the slit structure 2 can be made larger than the minimum wavelength of the sound wave
(plane wave) emitted from the planar speaker 1, and can also be made smaller.
[0016]
In the following description, for convenience of explanation, the minimum wavelength of the
sound wave emitted from the flat speaker 1 is referred to as the wavelength λmin. Since the
human audio frequency is about 20 Hz to about 20000 Hz, the wavelength of the audible sound
wave is about 17 m to about 1.7 cm. Therefore, the wavelength λ min may be set in advance as
about 1.7 cm.
[0017]
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Here, the correspondence between the slit width L of the slit structure 2 and the sound wave
emitted from the speaker device 100 will be described with reference to FIGS. 2 and 3. FIG. 2 is a
diagram schematically showing a sound wave in the case where the slit width L of the slit
structure 2 is larger than the wavelength of the sound wave emitted from the flat speaker 1. On
the other hand, FIG. 3 is a diagram schematically showing a sound wave in the case where the slit
width L of the slit structure 2 is shorter than the wavelength of the sound wave emitted from the
flat speaker 1.
[0018]
When the slit width of the slit structure 2 is larger than the wavelength of the sound wave
emitted from the flat speaker 1, as shown in FIG. Released. On the other hand, when the slit
width of the slit structure 2 is shorter than the wavelength of the sound wave emitted from the
flat speaker 1, as shown in FIG. 3, the slits (gaps) of the slit structure 2 are nondirectional. A
spherical wave is emitted. The speaker device 100 according to the present embodiment uses
such a characteristic that sound waves of wavelengths shorter than the slit width are emitted as
plane waves, while sound waves of wavelengths longer than the slit width are emitted as
spherical waves. Control to switch the directivity and non-directivity of the sound wave to be
output.
[0019]
It returns to the explanation of FIG. The control unit 3 is a control unit such as a CPU (Central
Processing Unit) and controls each unit of the speaker device 100. The input terminal 4 is a
terminal to which an audio signal is input. The flat speaker 1 is driven according to the audio
signal input to the input terminal 4, and a sound wave according to the audio signal is emitted
from the flat speaker 1. The motor 5 is a drive mechanism for moving the slit plate 2a in the
direction of arrow B in the drawing. The motor 5 is fixed to one end of the slit plate 2a, and the
slit plate 2a is moved in the direction of the arrow B in the figure by driving the motor 5. As the
slit plate 2a is moved by the motor 5, the slit width of the slit structure 2 is changed between the
range of zero to L1.
[0020]
The switch 6 is a switch for changing the slit width L of the slit structure 2. The user can change
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the slit width L of the slit structure 2 using the switch 6. When the switch 6 is operated by the
user, the switch 6 outputs a signal for moving the slit plate 2a in the direction of arrow B
(horizontal direction in the figure) in accordance with the operated content. The control unit 3
drives the motor 5 according to the signal output from the switch 6 to change the slit width of
the slit structure 2.
[0021]
Next, the operation of this embodiment will be described. The user can use the speaker device
100 as a spherical speaker and can also use the speaker device 100 as a flat speaker. When the
speaker device 100 is used as a spherical speaker, the user uses the switch 6 to perform an
operation for using the speaker device 100 as a spherical speaker. When the switch 6 is operated
by the user, the switch 6 outputs an operation signal for moving the slit plate 2a in the left
direction in the drawing according to the operated content. The controller 3 drives the motor 5
to change the slit width L of the slit structure 2 in accordance with the signal output from the
switch 6. Here, the control unit 3 changes the slit width L so that the slit width L of the slit
structure 2 is smaller than the minimum wavelength λmin of the sound wave emitted from the
flat speaker 1. The control unit 3 supplies a drive signal for changing the slit width to the motor
5, and the motor 5 moves the slit plate 2a according to the drive signal supplied from the control
unit 3, and the slit width L corresponds to the wavelength λmin Change to a shorter width. Since
the slit width L is shorter than the wavelength λmin, the plane wave emitted from the plane
speaker 1 is emitted as a spherical wave by passing through the slit structure 2.
[0022]
Next, an operation in the case of using the speaker device 100 as a flat speaker will be described.
When the speaker device 100 is used as a flat speaker, the user uses the switch 6 to perform an
operation for using the speaker device 100 as a flat speaker. When the switch 6 is operated by
the user, the switch 6 outputs an operation signal for moving the slit plate 2a in the right
direction on the sheet according to the operated content. The controller 3 drives the motor 5 to
change the slit width L of the slit structure 2 in accordance with the signal output from the
switch 6. Here, the control unit 3 changes the slit width L of the slit structure 2 so as to be the
maximum width L1. The control unit 3 supplies a drive signal for changing the slit width to the
motor 5, and the motor 5 moves the slit plate 2a according to the drive signal supplied from the
control unit 3 to set the slit width L to L1. change. When the slit width L becomes L1, a sound
wave of a wavelength shorter than L1 is emitted as a plane wave.
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[0023]
At this time, a sound wave of a wavelength longer than the slit width L1 is emitted from the
speaker device 100 as a spherical wave. That is, sound waves in a sound range lower than the
pitch of the sound wave whose wavelength is L1 are emitted from the speaker device 100 as
spherical waves. Therefore, when the speaker device 100 is used as a flat speaker, an audio
signal of only a sound range whose wavelength is shorter than L1 may be supplied to the
speaker device 100.
[0024]
Next, a specific operation example of the speaker device 100 will be described with reference to
FIGS. 4 and 5. For example, as shown to (a) of FIG. 4, when using the speaker apparatus 100
individually as an audio speaker, it uses as a plane speaker which has directivity. This makes it
possible to listen to music without producing noise, and there is no stress or discomfort when
wearing headphones. On the other hand, for example, as shown in FIG. 4B, when used in large
groups such as dance lessons and in-car audio, music can be listened to by a large number of
people by using it as a nondirectional spherical speaker.
[0025]
Moreover, as another example, as shown to (a) of FIG. 5, (b), for example, the speaker apparatus
100 can also be used as a speaker for company broadcasts. At this time, as shown in FIG. 5A,
when broadcasting to a specific individual, by using as a flat speaker, only the specific person can
listen to the broadcast, and People are not distracted by in-house broadcasts. On the other hand,
by using the speaker device 100 as a spherical speaker, in-house broadcasting to all employees
can also be performed.
[0026]
As described above, according to the present embodiment, the slit structure 2 in which the gap
(slit) having a variable width is formed is disposed on the sound emitting surface of the flat
speaker 1, and the width of the gap is adjusted to obtain the plane wave and the spherical
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surface. Switch between the waves. By doing this, it is possible to switch the directivity and nondirectivity of the sound wave output from the speaker device 100. Thus, according to the present
embodiment, one speaker device 100 can be used as a flat speaker capable of emitting a sound
toward a specific direction or a specific person, and delivers sound to an unspecified number of
people. It can also be used as a spherical speaker that can Thus, one speaker device 100 can be
used in combination for a plurality of applications.
[0027]
Moreover, since the speaker device 100 according to the present embodiment is configured to
provide the slit structure 2 on the sound emitting surface of the flat speaker 1, the speaker
device 100 can be configured to be thin and lightweight. In addition, the speaker device 100
according to the present embodiment is easier to switch than in the processing in which
directivity is given to the spherical speaker in the conventional speaker device.
[0028]
Although the embodiments of the present invention have been described above, the present
invention is not limited to the above-described embodiments, and can be implemented in various
other modes. An example is shown below. In addition, you may combine the following each
aspect suitably. (1) In the above embodiment, the control unit 3 changes the slit width of the slit
structure 2 according to the signal output from the switch 6, but the aspect of changing the slit
width is not limited to this. For example, control The unit 3 may detect the frequency of the audio
signal input to the input terminal 4 and change the slit width in accordance with the detected
frequency. In this case, the control unit 3 detects the frequency of the audio signal input to the
input terminal 4 and specifies the moving distance of the slit plate 2a according to the detected
frequency. Specifically, for example, the minimum wavelength λmin of the input audio signal
may be detected, and the moving distance of the slit plate 2a may be specified so that the slit
width L becomes shorter than the detected minimum wavelength λmin. Also, for example, the
maximum wavelength λmax of the input audio signal may be detected, and the movement
distance may be specified so that the slit width L is longer than the detected maximum
wavelength λmax. The control unit 3 supplies a drive signal corresponding to the specified
movement distance to the motor 5, and the motor 5 moves the slit plate 2a according to the
supplied drive signal.
[0029]
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(2) In the above embodiment, the slit plates 2a and 2b provided with a plurality of slits as shown
in FIG. 1 are used. However, the present invention is not limited to this. For example, as shown in
FIG. The slit structure 2A configured by the slit plates 2c and 2d provided with the slits may be
used. The point is that it should have a slit structure that covers the sound emitting surface of the
flat speaker and has a variable slit width.
[0030]
(3) In the above embodiment, the slit width of the slit structure 2 is changed by providing the
two slit plates 2a and 2b and moving the slit plate 2a in the direction perpendicular to the sound
output direction. The configuration of the slit structure 2 is not limited to this, as long as the slit
width is variable. For example, the slit width of the slit structure 2 may be changed by fixing one
corner of the slit plate 2a on the rotation axis and rotating the slit plate 2a. Further, for example,
the slit width may be changed by making the slit shape radial and making the slit plate 2a
circular and rotating it about the center of the circle as a rotation center.
[0031]
(4) In the above embodiment, the control unit 3 switches the slit width L of the slit structure 2
between the width smaller than the wavelength λmin and the width L1 according to the signal
output from the switch 6. The slit width may be set to a value other than this. For example, the
user may designate the value of the slit width L. Specifically, for example, if the user inputs the
value (or the frequency value, pitch, etc.) of the slit width L, and the controller 3 changes the slit
width in accordance with the input value. Good. In this case, a sound wave lower than the sound
wave corresponding to the input value is emitted as a spherical wave, while a sound wave higher
than the sound wave corresponding to the input value is emitted as a plane wave. In this case,
voices to be listened to by a large number of people use a range of wavelengths longer than the
predetermined wavelength, while voices desired to be heard by a specific direction or a specific
person use a range of wavelengths shorter than the predetermined wavelength. Good. According
to this aspect, the speaker device 100 can be used as a flat speaker and the speaker device 100
can also be used as a spherical speaker by selectively using the sound range, and one speaker
device 100 is used in combination for a plurality of applications. be able to.
[0032]
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(5) In the above-described embodiment, the audio signal of only the sound range whose
wavelength is shorter than L1 is supplied to the input terminal 4, but instead, the control unit 3
outputs the audio input to the input terminal 4 The signal may be converted and output so that
the wavelength becomes a frequency of a wavelength shorter than L1. More specifically, for
example, the control unit 3 performs a band pass filtering process on the audio signal input to
the input terminal 4 to cut an audio signal having a frequency lower than a predetermined
frequency. You may do so. The conversion process of the audio signal is not limited to this, and
for example, the control unit 3 may increase the frequency by performing pitch conversion of the
audio signal input to the input terminal 4. The point is that the control unit 3 may convert the
audio signal input to the input terminal 4 so that the wavelength thereof is shorter than the slit
width L. By doing this, only the plane wave is output from the speaker device 100.
[0033]
It is a figure which shows an example of a structure of a speaker apparatus. It is a figure for
demonstrating the sound wave emitted from a speaker apparatus. It is a figure for demonstrating
the sound wave emitted from a speaker apparatus. It is a figure which shows an example of the
utilization aspect of a speaker apparatus. It is a figure which shows an example of the utilization
aspect of a speaker apparatus. It is a figure which shows an example of a structure of a speaker
apparatus.
Explanation of sign
[0034]
DESCRIPTION OF SYMBOLS 1 ... Flat speaker, 2 ... Slit structure, 2a, 2b ... Slit board, 3 ... Control
part, 4 ... Input terminal, 5 ... Motor, 6 ... Switch, 100 ... Speaker apparatus.
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