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JP2012029095

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DESCRIPTION JP2012029095
To provide an audio output device capable of preventing non-users from listening to audio. A
sound output device (100) has a parametric speaker (10) that oscillates an ultrasonic wave and
forms a sound field (2) in which a sound is reproduced in a specific area (3) by demodulating the
oscillated ultrasonic wave. There is. The voice output device 100 includes a non-user detection
unit (for example, the monitor 5) that detects the intrusion or approach of the non-user 4 into the
specific area 3. The voice output device 100 has a control unit 6 that adjusts the sound field 2 so
that the non-user 4 can not hear the voice by controlling the parametric speaker 10 according to
the detection result by the non-user detection unit. ing. [Selected figure] Figure 1
Voice output device
[0001]
The present invention relates to an audio output device.
[0002]
The parametric speaker reproduces audible sound by demodulating the modulated audio signal
after oscillation.
The parametric speaker is also called a directional speaker and is characterized in that the
directivity of the output sound is high. For this reason, it is possible to selectively form a sound
field in a specific area by using a parametric speaker.
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[0003]
For example, in Patent Document 1, an ultrasonic speaker is installed in a state where voice can
be delivered only to a user such as an ATM, and it is detected by a human sensor that a person
other than the user has approached the sound field. There is described a technique for outputting
a notification sound to a user when it is detected.
[0004]
JP 2008-65578 A
[0005]
However, in the technique of Patent Document 1, when a person other than the user intrudes
into the sound field, the person hears the voice.
[0006]
An object of the present invention is to provide an audio output device capable of preventing a
person other than the user from hearing the audio.
[0007]
According to the present invention, there is provided a parametric speaker which generates an
ultrasonic wave and which demodulates the ultrasonic wave to form a sound field in which a
sound is reproduced in a specific area, and an intrusion of a non-user into the specific area. Or a
non-user detection unit for detecting an approach, and controlling the parametric speaker
according to the detection result by the non-user detection unit to prevent the sound from being
heard by the non-user. An audio output device is provided, comprising: a control unit to adjust.
[0008]
According to the present invention, it is possible to make non-users hear the voice.
[0009]
It is a schematic diagram for demonstrating the audio | voice output apparatus which concerns
on 1st Embodiment.
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It is a block diagram of the audio output device concerning a 1st embodiment.
It is a flowchart which shows the flow of operation | movement of the audio | voice output
apparatus which concerns on 1st Embodiment.
It is a schematic diagram of the oscillation apparatus with which the audio | voice output
apparatus which concerns on 1st Embodiment is provided.
It is sectional drawing which shows the layer structure of a vibrator | oscillator.
It is a schematic diagram for demonstrating the audio | voice output apparatus which concerns
on 2nd Embodiment.
It is a flowchart which shows the flow of operation | movement of the audio | voice output
apparatus which concerns on 2nd Embodiment. It is a schematic diagram for demonstrating the
audio | voice output apparatus which concerns on 3rd Embodiment. It is a flowchart which
shows the flow of operation | movement of the audio | voice output apparatus which concerns on
3rd Embodiment. It is a schematic diagram for demonstrating the audio | voice output apparatus
which concerns on 4th Embodiment. It is an enlarged view of FIG. It is a disassembled
perspective view which shows the structure of the MEMS actuator used as a vibrator | oscillator
of the oscillation apparatus with which the audio | voice output apparatus which concerns on 5th
Embodiment is provided.
[0010]
Hereinafter, embodiments of the present invention will be described using the drawings. In all
the drawings, the same components are denoted by the same reference numerals, and the
description thereof will be omitted as appropriate.
[0011]
First Embodiment FIG. 1 is a schematic view for explaining an audio output device 100 according
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to a first embodiment, FIG. 2 is a block diagram of the audio output device 100 according to the
first embodiment, and FIG. It is a flowchart which shows the flow of operation | movement of the
audio | voice output apparatus 100 which concerns on 1st Embodiment.
[0012]
The sound output apparatus 100 according to the first embodiment oscillates an ultrasonic wave,
and the generated ultrasonic wave is demodulated to form a parametric speaker 10 for forming a
sound field 2 in which a sound is reproduced in a specific area 3. Have.
The voice output device 100 further includes a non-user detection unit (for example, the monitor
5) that detects the intrusion or approach of the non-user 4 into the specific area 3. The voice
output device 100 further controls the parametric speaker 10 according to the detection result
by the non-user detection unit, thereby adjusting the control unit 6 to adjust the sound field 2 so
that the non-user 4 can not hear the sound. Have. The audio output device 100 may be, for
example, an electronic device (for example, a mobile terminal device such as a mobile phone or a
PDA (Personal Digital Assistant), a laptop personal computer, a small game device, etc.).
Alternatively, the voice output device 100 is used as a sound source of various facilities (for
example, ATM). The details will be described below.
[0013]
As shown in FIGS. 1 and 2, the audio output device 100 includes a parametric speaker 10, a
monitor 5, and a control unit 6.
[0014]
The parametric speaker 10 is configured to include, for example, a plurality of oscillating devices
1 for oscillating ultrasonic waves in an array.
The oscillation devices 1 are arranged, for example, in a matrix. For example, by controlling the
phases of the ultrasonic waves output from the respective oscillation devices 1 of the parametric
speaker 10 by the control unit 6, the sound field 2 in which the sound is reproduced can be
formed in the specific region 3.
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[0015]
The monitor 5 as a non-user detection unit continuously (or intermittently) monitors the
intrusion or approach of the non-user 4 to the area 3 in real time.
[0016]
As shown in FIG. 2, the monitor 5 has, for example, an intrusion or approach of the non-user 4
into the area 3 based on an imaging unit (camera) 7 for imaging a non-user and an imaging
result by the imaging unit 7. And a determination unit 8 that determines the
[0017]
The imaging unit 7 continuously (or intermittently) acquires an image in real time, and supplies
the acquired image data to the determination unit 8.
[0018]
The determination unit 8 stores and holds in advance identification information for identifying
the face of the user 9 of the voice output device 100, for example, and continuously obtains the
imaging result by the imaging unit 7 and the identification information in real time (or
Intermittently, the user 9 is determined by image recognition.
In addition, as identification information, the magnitude | size of the space | interval of both eyes
or the magnitude | size and shape of the triangle which ties both eyes and a nose etc. are
mentioned, for example.
[0019]
Then, when a person other than the user 9 registered in advance, ie, the non-user 4 intrudes or
approaches the area 3, the determination unit 8 uses the identification information to indicate
that the non-user 4 is not the user 9 The determination is made by the image recognition, and
the control unit 6 is notified of that effect.
[0020]
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When the control unit 6 receives a notification from the determination unit 8 that the non-user 4
has intruded or approached the area 3, the control unit 6 controls the oscillation devices to stop
the oscillation of the ultrasonic waves from the oscillation devices 1. Let the sound playback off.
The control unit 6 does not change the sound field 2 even if a person whose identification
information is registered as the user 9 enters and exits the specific area 3.
[0021]
The audio output device 100 may have a plurality (for example, two) of imaging units 7.
In this case, by determining the direction of the non-user 4 based on the imaging results of the
two imaging units 7, the direction of the non-user 4 can be determined with higher accuracy.
Further, in this case, since the distance from the voice output device 100 to the non-user 4 can
also be determined based on the imaging results by the two imaging units 7, the imaged non-user
4 is located in the area 3 It is possible to determine whether or not to do with higher accuracy.
Alternatively, the audio output device 100 may have an ultrasonic sensor used as a sonar, and by
using this ultrasonic sensor, the distance from the audio output device 100 to the non-user 4
may be determined. . Also in this case, it can be determined with higher accuracy whether the
non-user 4 is located in the area 3 or not.
[0022]
FIG. 4 is a schematic view of the oscillation device 1 provided in the audio output device 100
according to the first embodiment.
[0023]
The oscillation device 1 includes, for example, a sheet-like vibration member 30, a vibrator 20, a
support member 40, and a signal generation unit 54.
The vibrator 20 is, for example, a piezoelectric vibrator, and is attached to one surface of the
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vibrating member 30. The support member 40 supports the edge of the vibrating member 30.
The support member 40 is fixed to, for example, a circuit board (not shown) or a housing of the
audio output device 100. The signal generation unit 54 and the control unit 6 form an oscillation
circuit (input unit) that vibrates the vibrator 20 by inputting an oscillation signal to the vibrator
20 and causes the vibrator 20 and the vibration member 30 to oscillate sound waves. ing.
[0024]
The vibrating member 30 vibrates by the vibration generated from the vibrator 20 and oscillates
a sound wave having a frequency of, for example, 20 kHz or more. The vibrator 20 also
oscillates, for example, a sound wave having a frequency of 20 kHz or more when the vibrator 20
vibrates. The vibrating member 30 also adjusts the fundamental resonant frequency of the
vibrator 20. The fundamental resonance frequency of the mechanical oscillator depends on the
load weight and the compliance. Since the compliance is mechanical rigidity of the vibrator, by
controlling the rigidity of the vibrating member 30, the fundamental resonant frequency of the
vibrator 20 can be controlled. The thickness of the vibrating member 30 is preferably 5 μm or
more and 500 μm or less. Moreover, as for the vibration member 30, it is preferable that the
longitudinal elasticity coefficient which is a parameter | index which shows rigidity is 1 Gpa or
more and 500 GPa or less. If the rigidity of the vibrating member 30 is too low or too high, there
is a possibility that the characteristics and reliability of the mechanical vibrator will be impaired.
The material constituting the vibration member 30 is not particularly limited as long as it is a
material having a high elastic modulus with respect to the vibrator 20 which is a brittle material
such as metal or resin, but from the viewpoint of processability and cost Stainless steel is
preferable.
[0025]
In the present embodiment, the planar shape of the vibrator 20 is circular. However, the planar
shape of the vibrator 20 is not limited to a circle. The vibrator 20 is fixed to the vibrating
member 30 by an adhesive on the entire surface of the vibrator 20 facing the vibrating member
30. Thereby, the entire surface on one side of the vibrator 20 is restrained by the vibrating
member 30.
[0026]
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The signal generation unit 54 generates an electrical signal to be input to the vibrator 20, that is,
a modulation signal in the parametric speaker 10. The transport wave of the modulation signal is,
for example, an ultrasonic wave having a frequency of 20 kHz or more, and specifically, for
example, an ultrasonic wave of 100 kHz. The control unit 6 controls the signal generation unit
54 in accordance with an audio signal input from the outside.
[0027]
FIG. 5 is a cross-sectional view showing a layered structure in the thickness direction of the
vibrator 20. As shown in FIG. The vibrator 20 has a piezoelectric body 22, an upper surface
electrode 24 and a lower surface electrode 26.
[0028]
The piezoelectric body 22 is polarized in the thickness direction. The material constituting the
piezoelectric body 22 may be either an inorganic material or an organic material as long as it has
a piezoelectric effect. However, a material having high electromechanical conversion efficiency,
such as zirconate titanate (PZT) or barium titanate (BaTiO3) is preferable. The thickness h1 of the
piezoelectric body 22 is, for example, 10 μm or more and 1 mm or less. If the thickness h1 is
less than 10 μm, there is a possibility that the vibrator 20 may be broken when the oscillator 1
is manufactured. When the thickness h1 is more than 1 mm, the electromechanical conversion
efficiency is too low, and there is a possibility that a sufficient magnitude of vibration can not be
obtained. The reason is that when the thickness of the vibrator 20 is increased, the electric field
intensity in the piezoelectric vibrator is decreased in inverse proportion.
[0029]
Although the material which comprises the upper surface electrode 24 and the lower surface
electrode 26 is not specifically limited, For example, silver and silver / palladium can be used.
Silver is used as a low-resistance, general-purpose electrode material, and thus has advantages in
manufacturing process and cost. Since silver / palladium is a low resistance material excellent in
oxidation resistance, it is advantageous from the viewpoint of reliability. Further, the thickness
h2 of the upper surface electrode 24 and the lower surface electrode 26 is not particularly
limited, but it is preferable that the thickness h2 is 1 μm to 50 μm. If the thickness h2 is less
than 1 μm, it is difficult to form the upper surface electrode 24 and the lower surface electrode
03-05-2019
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26 uniformly, and as a result, the electromechanical conversion efficiency may be reduced. In
addition, when the film thickness of the upper surface electrode 24 and the lower surface
electrode 26 exceeds 100 μm, the upper surface electrode 24 and the lower surface electrode
26 become a constraining surface with respect to the piezoelectric body 22, which may lower
energy conversion efficiency.
[0030]
The vibrator 20 can have an outer diameter of φ18 mm, an inner diameter of φ12 mm, and a
thickness of 100 μm. Further, as the upper surface electrode 24 and the lower surface electrode
26, for example, a silver / palladium alloy (weight ratio is, for example, 7: 3) having a thickness of
8 μm can be used. Further, as the vibrating member 30, phosphor bronze having an outer
diameter of φ 20 mm and a thickness of 50 μm (0.3 mm) can be used. The support member 40
functions as a case of the oscillation device 1 and is formed in, for example, a cylindrical (for
example, cylindrical) shape with an outer diameter of φ22 mm and an inner diameter of φ20
mm.
[0031]
The parametric speaker 10 radiates into the air ultrasonic waves (transport waves) subjected to
AM modulation, DSB modulation, SSB modulation, and FM modulation from a plurality of
oscillation sources respectively, and nonlinear characteristics when the ultrasonic waves
propagate into the air Makes the audible sound appear. Here, non-linear means transition from
laminar flow to turbulent flow as the Reynolds number indicated by the ratio of flow inertia
action to viscosity action increases. The sound waves are non-linear and propagate because the
sound waves are finely disturbed in the fluid. In the ultrasonic frequency band in particular, the
nonlinearity of the sound wave can be easily observed. When ultrasonic waves are radiated into
the air, harmonics associated with the non-linearity of the sound waves are generated notably. In
addition, sound waves are in a dense / dense state in which concentration of molecular density
occurs in the air. And, if time is taken for air molecules to recover more than compression, air
that can not be recovered after compression collides with continuously propagating air molecules
and a shock wave is generated. The shock wave generates an audible sound, that is, the audible
sound is reproduced (demodulated). The parametric speaker 10 has the advantage that the
directivity of sound is high.
[0032]
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Next, a series of operations will be described.
[0033]
First, the identification information of the user 9 is registered in advance.
For this purpose, for example, the user 9 operates the voice output device 100 to capture his
face. The control unit 6 generates identification information by analyzing the photographed face
image. For example, first, an image of a face is extracted from the captured whole image, both
eyes and a nose are extracted from the image of the extracted face, and information on the size
and shape of a triangle connecting them is identified information Generate and store as
[0034]
When the user 9 performs an operation to instruct sound reproduction, the control unit 6
appropriately controls each oscillation device 1 of the parametric speaker 10 to form the sound
field 2 in the specific area 3. That is, the reproduction of voice is started. On the other hand, the
monitor 6 is controlled by the control unit 6 to start monitoring the intrusion or approach of the
non-user 4 to the area 3 (step S11 in FIG. 3).
[0035]
Thereafter, when the intruding or approach of the non-user 4 to the area 3 is detected by the
monitor 5 (Y in step S12 of FIG. 3), each oscillating device 1 is controlled by the control unit 6 to
make each oscillating device The oscillation of the ultrasonic wave from 1 is stopped to turn off
the reproduction of the sound (step S13 in FIG. 3).
[0036]
When the intrusion or approach of the non-user 4 to the area 3 is not detected by the monitor 5
(N in step S12 in FIG. 3), the monitoring by the monitor 5 is continued (the determination in step
S12 is repeated).
[0037]
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In order to perform such an operation, as shown in FIG. 1A, in the state where the user 9 exists in
the sound field 2 and the non-user 4 exists outside the sound field 2, Audio playback continues.
On the other hand, as shown in FIG. 1B, when the non-user 4 intrudes or approaches the sound
field 2, the reproduction of the sound in the area 3 is turned off.
For this reason, it is possible to make the non-user 4 not hear the voice.
[0038]
According to the first embodiment described above, the non-user 4 is controlled by controlling
the parametric speaker 10 according to the detection result by the monitor 5 that detects the
intrusion or approach of the non-user 4 into the specific area 3. Adjust sound field 2 so that no
sound is heard. Specifically, when the intrusion or approach of the non-user 4 into the area 3 is
detected, the sound reproduction is turned off by stopping the oscillation of the ultrasonic wave
from each oscillation device 1. As a result, it is possible to prevent a person other than the user 9
(that is, the non-user 4) from listening to the voice. Therefore, a private sound field 2 dedicated
to the user 9 can be realized.
[0039]
Second Embodiment FIG. 6 is a schematic view for explaining an audio output device 100
according to a second embodiment, and FIG. 7 is a flowchart showing the flow of the operation of
the audio output device 100 according to the second embodiment. It is.
[0040]
In the case of the present embodiment, when the control unit 6 receives from the determination
unit 8 a notification that the non-user 4 has entered or approached the area 3, the user 9
controls the respective oscillation devices 1 so that the user 9 can The range of formation of the
sound field 2 is narrowed so that the non-user 4 is located inside the sound field 2 and out of the
sound field 2.
[0041]
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Hereinafter, a series of operations in the case of the present embodiment will be described.
First, as in the first embodiment, the sound field 2 is formed in a specific area 3 (sound
reproduction is started), and monitoring of intrusion or approach of a non-user 4 into the area 3
is started ( Step S11 of FIG. 7, FIG. 6 (a).
[0042]
Thereafter, when the intruding or approach of the non-user 4 to the area 3 is detected by the
monitor 5 (Y in step S12 of FIG. 7), the phase of the ultrasonic wave output from each oscillation
device 1 by the control unit 6 By controlling, the user 9 is located in the sound field 2 and the
non-user 4 narrows the formation range of the sound field 2 so as to be out of the sound field 2
(step S23 in FIG. 6 (b).
This makes it possible to prevent the non-user 4 from listening to the voice.
[0043]
In the case where intrusion or approach of the non-user 4 into the area 3 is not detected (N in
step S12 in FIG. 7), monitoring is continued (the determination in step S12 is repeated).
[0044]
According to the second embodiment described above, when intrusion or approach of the nonuser 4 into the specific area 3 is detected, the non-user 4 can hear the voice by narrowing the
formation range of the sound field 2. It can be made unheard.
Also, by narrowing the sound field 2 so that the user 9 is located in the sound field 2, the user 9
can continue listening to the voice.
[0045]
Third Embodiment FIG. 8 is a schematic view for explaining an audio output device 100
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according to a third embodiment, and FIG. 9 is a flow chart showing the flow of the operation of
the audio output device 100 according to the third embodiment. It is.
[0046]
In the case of the present embodiment, when the control unit 6 receives from the determination
unit 8 a notification that the non-user 4 has entered or approached the area 3, the user 9
controls the respective oscillation devices 1 so that the user 9 can The formation range of the
sound field 2 is moved so that the non-user 4 is located in 2 and out of the sound field 2.
[0047]
Hereinafter, a series of operations in the case of the present embodiment will be described.
First, as in the first embodiment, the sound field 2 is formed in a specific area 3 (sound
reproduction is started), and monitoring of intrusion or approach of a non-user 4 into the area 3
is started ( Step S11 of FIG. 9, FIG. 8 (a).
[0048]
Thereafter, when the intruding or approach of the non-user 4 to the area 3 is detected by the
monitor 5 (Y in step S12 of FIG. 9), the control unit 6 controls each oscillation device 1 to allow
the user 9 Is located in the sound field 2 and the non-user 4 moves the formation range of the
sound field 2 so as to be out of the sound field 2 (step S23 in FIG. 9, (FIG. 8B)).
Thus, the user 9 can hear the voice and the non-user 4 can not hear the voice.
[0049]
In the case where intrusion or approach of the non-user 4 into the area 3 is not detected (N in
step S12 in FIG. 7), monitoring is continued (the determination in step S12 is repeated).
[0050]
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13
According to the above third embodiment, when the intrusion or approach of the non-user 4 into
the specific area 3 is detected, the non-user 4 is made to voice by moving the formation range of
the sound field 2 Can be kept silent.
Further, by moving the sound field 2 so that the user 9 is positioned in the sound field 2, the user
9 can continue listening to the voice.
[0051]
Fourth Embodiment FIG. 10 is a schematic view for explaining an audio output device 100
according to a fourth embodiment, and FIG. 11 is an enlarged view of FIG.
[0052]
In the third embodiment, an example in which the formation range of the sound field 2 is moved
by controlling the phase of the ultrasonic wave output from each oscillation device 1 has been
described.
On the other hand, in the fourth embodiment, the formation range of the sound field 2 is moved
by changing the output direction of the sound wave from the oscillation device 1 by the actuator
12. In the other points, the fourth embodiment is the same as the third embodiment.
[0053]
In the case of this embodiment, instead of the parametric speaker 10 having a plurality of
oscillating devices 1 in an array, a parametric speaker 10 comprising a single oscillating device 1
and a plurality of actuators 12 for changing the direction of the parametric speaker 10 And a
support 11 to which these actuators 12 are fixed.
[0054]
The support 11 is fixed to the housing of the audio output device 100 directly or indirectly.
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The support part 11 is formed in flat form, for example.
[0055]
The actuator 12 is, for example, a piezoelectric element, and expands and contracts by
controlling an applied voltage. One end of each of the actuators 12 is fixed to the support portion
11, and the other end is fixed to, for example, a support member 40 of the oscillation device 1.
For example, as shown in FIG. 11, the actuators 12 are provided so as to stand vertically from
one surface of the support portion 11 respectively.
[0056]
The number of actuators 12 can be two or three. In the case of providing three actuators 12, the
degree of freedom in adjusting the orientation of the oscillation device 1 is increased. 10 and 11
show an example in which two actuators 12 are provided.
[0057]
In the normal state, the output direction of the ultrasonic wave from the oscillation device 1 is
opposite to the support portion 11 (that is, in the normal state, the vibrating member 30 of the
oscillation device 1 and the support portion 11 are It becomes parallel to each other) (FIG. 11
(a)).
[0058]
Further, by contracting any one of the actuators 12 (or extending any one of the actuators 12),
the angle of the oscillation device 1 with respect to the support portion 11 is changed, and the
output direction of the ultrasonic wave from the oscillation device 1 is changed. (Ie, the vibrating
member 30 can be inclined with respect to the support 11) (FIG. 11 (b)).
[0059]
According to the fourth embodiment, the same effect as that of the third embodiment can be
obtained.
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Further, in the case of the fourth embodiment, since the formation range of the sound field 2 is
moved by changing the output direction of the sound wave from the oscillation device 1 by the
actuator 12, the parametric speaker 10 includes a plurality of oscillation devices 1 as an array. It
is not necessary to have a shape, for example, it may only have a single oscillating device 1.
[0060]
Fifth Embodiment The oscillation device 1 of the audio output device 100 according to the
present embodiment has a MEMS (Micro Electro Mechanical Systems) actuator 70 shown in FIG.
12 instead of the vibrator 20.
In other points, the audio output device 100 according to the present embodiment is configured
in the same manner as the audio output device 100 according to the first to fourth embodiments.
[0061]
In the example shown in FIG. 12, the drive system of the MEMS actuator 70 is a piezoelectric
system, and the piezoelectric thin film layer 72 is sandwiched between the upper movable
electrode layer 74 and the lower movable electrode layer 76. The MEMS actuator 70 operates by
inputting a signal from the signal generation unit 54 to the upper movable electrode layer 74
and the lower movable electrode layer 76. For example, an aerosol deposition method is used to
manufacture the MEMS actuator 70, but is not limited to this method. However, it is preferable to
use the aerosol deposition method because the piezoelectric thin film layer 72, the upper
movable electrode layer 74, and the lower movable electrode layer 76 can be formed on curved
surfaces, respectively. The driving method of the MEMS actuator 70 may be an electrostatic
method, an electromagnetic method, or a heat conduction method.
[0062]
Although the embodiments of the present invention have been described above with reference to
the drawings, these are merely examples of the present invention, and various configurations
other than the above can also be adopted.
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[0063]
For example, although an example in which the non-user detection unit is the monitor 5 having
the imaging unit 7 has been described above, the non-user detection unit may be a human sensor
such as an ultrasonic sensor or an infrared sensor .
[0064]
Moreover, although the example in which only the identification information of the user 9 is
registered in advance has been described above, the identification information of the non-user 4
may be registered in advance.
In this case, for the person whose intrusion or approach to the specific area 3 is detected, it is
determined whether or not the user is the non-user 4 using the identification information, and it
is determined that the user is the non-user 4 It is better to adjust the sound field 2 so that the
non-user 4 can not hear the sound.
[0065]
In the above, an example in which the identification information of the user 9 is registered in
advance has been described. However, when the user 9 performs an operation to instruct sound
reproduction, the person's position located in the field of view of the imaging unit 7 The
identification information may be registered as identification information of the user 9.
[0066]
Further, in the first embodiment described above, the control unit 6 stops the oscillation of the
ultrasonic wave when the non-user 4 intrudes or approaches the specific area 3 and detects the
reproduction of the sound. Although the example which turns off was demonstrated, you may
make it reduce the sound pressure of an audio | voice to the level (for example, 30 dB or less)
which a person can not hear.
[0067]
Reference Signs List 1 oscillator 2 sound field 3 specific area 4 non-user 5 monitor 6 control unit
7 imaging unit 8 determination unit 9 user 10 parametric speaker 11 support unit 12 actuator
20 vibrator 22 piezoelectric body 24 upper surface electrode 26 lower surface electrode 30
vibration Member 40 Support member 54 Signal generation unit 70 MEMS actuator 72
Piezoelectric thin film layer 74 Upper movable electrode layer 76 Lower movable electrode layer
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100 Audio output device
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