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DESCRIPTION JP2005087572

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DESCRIPTION JP2005087572
PROBLEM TO BE SOLVED: To realize an electroencephalogram induction device capable of
performing effective electroencephalogram induction by emitting ultra low sound waves lower
than the audible range into the atmosphere with a small and simple configuration, and further,
Provide a human body holding device such as a chair or bedding which performs EEG guidance.
SOLUTION: An ultrasonic wave oscillation unit 1 for oscillating ultrasonic waves, an amplitude
modulation unit 2 for amplitude-modulating the ultrasonic waves to form fluctuation in
amplitude, and emitting the ultrasonic waves thus amplitude-modulated to the atmosphere In the
electroencephalogram guiding apparatus provided with the ultrasonic wave output unit 3, the
amplitude modulation in the amplitude modulation unit 2 is configured such that the fluctuation
of the amplitude is in a frequency band equal to or less than the audible range. [Selected figure]
Figure 1
EEG guidance device
[0001]
The present invention can induce the user's brain waves towards mental calmness or conversely
awakening, effectively achieving relaxation or transition to a sleep state or a reverse activated
state. The present invention relates to an electroencephalogram induction device.
[0002]
Conventionally, it is known that it is possible to induce the user's electroencephalogram by
providing the user with a stimulus having frequency characteristics close to the frequency band
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of the electroencephalogram.
There are various stimulation means such as light, mechanical vibration, sound, electricity and
the like.
[0003]
Among these, as disclosed in Japanese Patent Laid-Open No. 9-164206, there is provided a
comfort providing device for generating an atmospheric pressure fluctuation or air flow
fluctuation of an audio frequency lower than an audio frequency from a speaker system in a free
space where a user is present. is there. According to this apparatus, since the stimulation to be
used is an ultrasonic wave at an audible frequency or lower, it does not sound as a sound to one
or a plurality of target persons, and therefore, mental and physical comfort can be achieved
without giving a subjective stimulation. And activation can occur.
[0004]
Here, the very low frequency below the audio frequency refers to the frequency below 16 to 20
Hz because the threshold on the low frequency side of the audio frequency band is about 16 to
20 Hz. And in order to take out such a low frequency from a speaker, it is sufficient to vibrate the
diaphragm of the speaker at such a low frequency.
[0005]
However, since such a speaker generally has low radiation resistance, most of the supplied
vibrational energy is consumed in moving the medium as a whole and does not easily become a
sound wave. That is, generally speaking, the reproducible low frequency band is determined by
the aperture of the speaker, but a large aperture is required to output an ultra-low sound wave
below the audio frequency, and the device becomes large. It is quite difficult.
[0006]
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Further, as disclosed in Japanese Utility Model Registration No. 3087142, a sleep introducing
device has been devised which transmits ultrasonic waves in synchronization with ON and OFF
signals of a constant cycle. This apparatus controls the frequency of ultrasonic wave transmission
to be interrupted for a predetermined time in a frequency band lower than the beta wave of brain
waves, that is, the frequency of alpha wave, theta wave or delta wave, and the like. And a sleeping
pillow in which an ultrasonic transmitter for outputting intermittent ultrasonic waves is
embedded.
[0007]
However, in this device, the ON / OFF signal of the ultrasonic wave is synchronized with the
period of the α wave, the θ wave or the δ wave, and although it has a simple configuration, it
does not directly output the ultrasonic wave. In some cases, the effect may not be sufficient
because it is not. JP, 9-164206, A Utility model registration No. 3087142
[0008]
The present invention has been invented in view of the above-mentioned background art, and its
subject is to provide an electroencephalogram guiding apparatus capable of emitting an effective
low-sound wave lower than the audible range into the atmosphere to effectively induce an
electroencephalogram. In a compact and simple configuration. Furthermore, it is to realize a
human body holding device such as a chair or bedding which performs such an
electroencephalogram induction.
[0009]
In order to solve the above problems, an electroencephalogram induction device according to the
present invention comprises an ultrasonic wave oscillating unit that oscillates an ultrasonic wave,
an amplitude modulating unit that modulates the amplitude of the ultrasonic wave to form an
amplitude fluctuation, and thus an amplitude. In an electroencephalogram guiding apparatus
including an ultrasonic wave output unit that emits modulated ultrasonic waves into the
atmosphere, the amplitude modulation in the amplitude modulation unit is configured such that
the amplitude fluctuation is in a frequency band below the audible range. There is.
[0010]
In addition, in a human body holding device such as a chair or bedding, the ultrasonic wave
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output unit in the above-described electroencephalogram guiding device is attached to a position
where it is emitted toward the user of the device.
[0011]
In the electroencephalogram induction device of the present invention, the fluctuation of the
amplitude of the ultrasonic wave emitted from the ultrasonic wave output unit into the
atmosphere is configured to be in the frequency band below the audible range.
In this case, since the ultrasonic wave output unit can use an ultrasonic speaker, it is not
necessary to use a large low frequency speaker, and sound waves in the inaudible range can be
generated in the atmosphere.
Therefore, this electroencephalogram induction device is realized with a small and simple
configuration. In addition, by causing the inaudible ultrasonic waves to act directly on the human
body, the user can effectively induce EEG-induced relaxation and sleep without recognizing such
ultrasonic waves and ultrasonic waves as sounds. It is led to the state or reverse activated state.
[0012]
Furthermore, in the case of a human body holding device such as a chair or bedding which
performs such an electroencephalogram induction, since the ultrasonic wave output unit is small,
it is easy to attach to the device body, and it is easy to position the ultrasonic wave on the human
body. The device can be attached, configured simply, and capable of performing
electroencephalogram induction in a state in which the human body is effectively held in this
device.
[0013]
Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1,
FIG. 2 and FIG.
FIG. 1 is a block diagram showing a basic configuration of an electroencephalogram guiding
apparatus according to the present invention, FIG. 2 is a graph showing waveforms in each block
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of the apparatus and generated ultrasonic waves, and FIG. It is a graph explaining the
phenomenon.
[0014]
As shown in FIG. 1, the electroencephalogram guiding apparatus comprises an ultrasonic wave
oscillating unit 1 for oscillating ultrasonic waves, and an amplitude for amplitude-modulating
ultrasonic waves generated by the ultrasonic wave transmitting unit 1 to form amplitude
fluctuations. It comprises a modulation unit 2 and an ultrasonic wave output unit 3 for emitting
the ultrasonic waves thus modulated in amplitude to the atmosphere. The amplitude modulation
unit 2 is configured such that the fluctuation of the amplitude is in a frequency band equal to or
less than the audible range.
[0015]
In this case, a general speaker capable of outputting an ultrasonic wave is used as the ultrasonic
wave output unit 3. The amplitude of the ultrasonic wave emitted from the ultrasonic wave
output unit 3 into the atmosphere is released into the atmosphere at a frequency band below the
audible range. In other words, according to the principle of a parametric speaker that generates
low-frequency sound waves using ultrasonic waves as propagation means, sound waves at
frequencies below the audible range as described above at a certain distance from the ultrasonic
wave output unit 3, in other words Ultrasonic waves are generated in the atmosphere. Of course,
such ultrasonic waves can not be heard as sounds by humans, but can irritate the tympanic
membrane and skin of a living body and can affect the physiological condition. More specifically,
as a sound source of a parametric speaker, various types of sources such as one in which an
ultrasonic transducer is disposed, a reflector type, a piezoelectric ceramic array type, a type to
which a piezoelectric effect is applied, and the like can be used.
[0016]
For example, when stimulation by ultrasound that is slightly higher than the brain wave is given,
the user is induced the brain wave in the direction of awakening. Also, conversely, when the
stimulation by ultrasonic waves slightly lower than the electroencephalogram is given, the user's
electroencephalogram is induced to calm the mind and has an effect of shifting to a relaxation or
sleep state. As described above, it is possible to induce an electroencephalogram in either
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direction of awakening or calming by the frequency of the applied ultrasonic wave, but in the
following description, the present application will be described particularly in the case of
calming.
[0017]
In the parametric speaker, when amplitude modulation of the ultrasonic wave amplitude as the
primary wave is performed to the frequency band of the sound wave having a certain specific
frequency characteristic, the self-demodulation effect makes the predetermined position at a
certain distance away from the speaker The sound wave of the specific frequency is generated as
a secondary wave. In this case, a non-linear phenomenon is used when ultrasonic waves
propagate in the air, and the secondary wave increases its amplitude cumulatively as the primary
wave propagates, and the primary wave is absorbed or spherically diffused. And the amplification
effect of the secondary wave continues until the nonlinear effect is weakened. Of course, there
are also ultrasound waves which are primary waves at a predetermined position, but ultrasound
waves have a fast wavelength and a large degree of attenuation.
[0018]
In FIG. 2, (a) shows an ultrasonic waveform oscillated from the ultrasonic wave oscillating unit 1,
(b) shows an ultrasonic waveform modulated in amplitude by an ultrasonic wave lower than the
audio frequency band in the amplitude modulating unit 2, (c) Indicates an ultrasonic waveform
generated at a predetermined position. Here, the predetermined position is a position where the
human body to be a target for promoting relaxation and transition to a sleep state by slowing
down the brain waves is assumed, and it is assumed that the head, particularly the ear with
eardrums. Can. However, the position at which this ultra-low sound wave is generated is a sound
pressure at which the ultra-low sound wave is at a level required for the purpose at the
predetermined position, and the brain wave is slowed down to relax or sleep. It can be anywhere
as long as it can facilitate the transition to
[0019]
The frequency of the ultrasonic wave to be generated needs to be equal to or less than this
frequency because the threshold on the low frequency side of the audio frequency band is about
16 to 20 Hz. More specifically, among specific expression frequencies of electroencephalogram,
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8 to 13 Hz are generally referred to as α wave and 4 to 7 Hz as θ wave, and the
electroencephalogram using ultra low sound waves coincident with these frequencies. It is
conceivable to derive the frequency of The phenomenon that the brain wave tunes to the
stimulation frequency when stimulation is performed at a frequency close to that of the brain
wave is well known as a "pull-in" phenomenon.
[0020]
The non-linear phenomenon described above is a generally well-known phenomenon as shown in
FIG. 3 and appears when the sound pressure of the sound wave is high. This figure is based on an
air experiment in which the sound pressure relationship was measured when sine waves with a
frequency of 0.5 to 3.57 kHz were propagated in the waveguide with an inner diameter of 5 cm.
At 3.57 kHz, nonlinearity is observed when the sound pressure level near the sound source is
about 140 dB or more. In particular, when the frequency is high, the received sound pressure is
saturated even at a low sound source sound pressure level, and non-linearity is likely to be
observed.
[0021]
Also, due to the parametric array effect, the self-demodulated secondary wave beam is narrow
and the directivity is high. That is, it is possible to generate a sound wave having a strong
directivity and amplified specific frequency. When the parametric array is used as a speaker, the
frequency of the primary wave is in the ultrasonic range of 20 kHz or more. Usually, around 40
kHz is often used. As a result, it is possible to make ultra-low sound waves act on the target user
particularly effectively.
[0022]
Here, the effects of ultrasound on the human body are described in the case of non-contact
airborne ultrasound on the human body, although there is no clear opinion yet, but there is a
report that there is no change if it is about 100 dB or less. It is preferable to keep the sound
pressure level in the vicinity not too high.
[0023]
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In addition, it becomes a more preferable form when the frequency of the fluctuation of the
ultrasonic wave amplitude as the primary wave is made to have 1 / f fluctuation characteristics.
Here, 1 / f fluctuation is fluctuation seen in natural wave phenomena such as tidal noise,
screeching noise of Ogawa, etc., and power spectrum is inversely proportional to Fourier
frequency. In this case, since it is possible to adjust to the fluctuation matched to the rhythm of
the living body, it is especially smoothly transferred to the state of relaxation or sleep.
[0024]
Hereinafter, more specific embodiments of the amplitude modulation in the amplitude
modulation unit 2 will be described with reference to FIGS. 4 to 7. FIGS. 4 to 6 are graphs for
explaining the modulation state of the amplitude modulation unit 2 in one embodiment of the
present invention. FIG. 7 is a block diagram showing the configuration of an
electroencephalogram guiding apparatus according to an embodiment of the present invention.
[0025]
As shown in FIG. 4, in this embodiment, the amplitude modulation unit 2 is configured such that
the frequency of the amplitude fluctuation decreases with time. That is, the frequency of the
brain wave shifts from the high frequency band to the low frequency band with the decrease in
the level of consciousness such as a change from awake state to a relaxed state, a sleep state, a
shallow sleep state, or a deep sleep state. It is known. Therefore, in the example of this figure, the
frequency of the generated ultra low sound wave is controlled to decrease with the passage of
time. When the mind is calming down, such as relaxation or sleepiness, the frequency of the
brain waves gradually slows down. Thus, withdrawal stimulation becomes more desirable as the
frequency is gradually reduced.
[0026]
Further, as shown in FIG. 7, in this embodiment, an electroencephalogram detection unit 4 for
detecting an electroencephalogram of a person who receives an electroencephalogram induction
is further provided, and the amplitude modulation unit 2 is an electroencephalogram detected by
the electroencephalogram detection unit 4. It is configured to perform amplitude modulation
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substantially in accordance with the frequency. That is, the signal of the brain wave detection
unit 4 which detects the brain wave of the user is input to the amplitude modulation unit 2, and
the ultrasonic wave is amplitude modulated so as to be synchronized with the frequency of the
brain wave detected by the brain wave detection unit 4. In this case, since the
electroencephalogram is induced in accordance with the calming of the user's
electroencephalogram, the electroencephalogram can be induced more reliably.
[0027]
In order to detect an electroencephalogram, for example, a method of attaching a plate electrode
to the head of a human body, amplifying the signal and performing frequency analysis may be
considered. However, any configuration may be used as long as the frequency of the user's brain
waves can be derived, and by providing stimulation with a frequency that is the same as or
similar to the frequency of the detected brain waves, the entrainment phenomenon is likely to
occur. Control can be performed according to the level of consciousness of the living body. The
frequency approximate to the frequency of the brain wave detected by the brain wave detection
unit 4 is preferably a frequency within ± 10% of the detected frequency. Even if it is about ±
15%, it is effective, but if it is more than this, especially more than ± 20%, the degree of
difference from the frequency of the detected brain wave becomes high, the phenomenon of
entrainment hardly occurs, and almost no effect is observed It is a thing. In addition, it is said
that the power spectrum level of the peak frequency of the electroencephalogram is increased at
the time point, and the state of being easy to be calmed down is obtained in the entrainment
phenomenon by giving stimulation of the same or similar frequency to the frequency of the
electroencephalogram. ing.
[0028]
Further, as shown in FIG. 5, in this embodiment, the frequency to be substantially matched is set
to a low predetermined frequency within minus 10%. The broken line A in this figure indicates
the temporal change of the frequency of the electroencephalogram detected by the
electroencephalogram detection unit 4, and the solid line B indicates a frequency that is later
than the frequency of the electroencephalogram detected by the electroencephalogram detection
unit 4 by a predetermined frequency. Here, when a specific numerical value of the frequency is
exemplified, the frequency is within 1 Hz with respect to the detected frequency. For example,
when the frequency of the detected brain wave is 10 Hz, a stimulation of 9 Hz is given first, and
when the frequency of the brain wave shifts to 9 Hz, a stimulation of 8 Hz is given this time, etc.
That is, the frequency of the brain wave shifts from the high frequency band to the low
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frequency band as the level of consciousness declines from rest to relaxation, sleep onset,
shallow sleep, deep sleep at awakening In the process, by applying stimulation with a frequency
lower by about 10% than the frequency of the electroencephalogram detected by the
electroencephalogram detection unit 4, a pull-in phenomenon is more likely to occur, and reliable
electroencephalogram induction can be performed.
[0029]
Moreover, an embodiment as shown in FIG. 6 is also preferable. In this embodiment, first, in the
first section, stimulation of a frequency lower than the frequency of the electroencephalogram
detected by the electroencephalogram detection unit 4 by a predetermined frequency is made to
facilitate the entrainment phenomenon, and Control is performed according to the level of
consciousness of the subject, and then, in the second interval, a stimulus of a frequency that is
the same as or very similar to the frequency of the brain wave detected by Control is performed
according to the level of consciousness of the living body, and further, in the third section,
stimulation is caused to occur at a frequency lower than the frequency of the detected brain
wave by a predetermined frequency, thereby facilitating the entrainment phenomenon. Repeating
the control according to the level of consciousness. The time interval of each section is, for
example, 30 seconds. This time interval may or may not be constant. The example of this figure is
the case where the time interval is not constant. The stimulus C in the figure is a frequency lower
than the frequency of the electroencephalogram detected by the electroencephalogram detection
unit 4 by a predetermined frequency, and the stimulus D is the same as or very similar to the
frequency of the electroencephalogram detected by the electroencephalogram detection unit 4.
In this case, since there is a section in which the electroencephalogram is induced at a frequency
that matches the frequency of the user's electroencephalogram, the electroencephalogram
induction without discomfort can be easily performed.
[0030]
In addition, the following forms are also preferable. In other words, ultrasonic waves that are
primary waves are amplitude-modulated by a period called an ultrasonic wave below the audio
frequency band, and then audible, that is, amplitude-modulated in the normal music frequency
band, and those amplitude-modulated ultrasonic waves Output. By such an operation, it becomes
possible to simultaneously generate an ultra low sound wave and an audio frequency sound wave
at a predetermined position apart from the ultrasonic wave output unit 3 by a self-demodulation
effect. Here, only audible frequency sound waves are heard on the human body. In this case, the
audio frequency sound wave is an audio frequency sound wave in which the frequency of the
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pure tone changes with the passage of time, not only in general music which is a sound wave in
which various frequencies are combined but also in pure sound which is a sound wave of
constant frequency. It may be. In this case, not only there is a comfort effect by sound waves,
such as listening to favorite music, but also this sound wave is highly directional by the
parametric array effect, so it can be heard well only by the user and surrounding people. It has
less to affect.
[0031]
Further, it is also preferable that the amplitude modulation intensity in the amplitude modulation
unit 2 be decreased with the lapse of time. Here, after the amplitude modulation unit 2 controls
so that the frequency of the ultrasonic wave becomes constant, the amplitude of the ultrasonic
wave is controlled to decrease with time. In addition, as described above, the amplitude
modulation unit 2 may be controlled to change the frequency of the ultrasonic wave, and may be
controlled so that the amplitude of the ultrasonic wave decreases with the passage of time.
Although the level of consciousness declines during mental sedation, such as relaxation and
sleepiness, the control according to such a decline in the body's level of consciousness by
decreasing the amplitude of the outputted ultrasound itself with time. It is
[0032]
In addition, it is one of the preferable modes that is provided with a human awareness level
detection unit that receives an electroencephalogram lead, and the amplitude modulation in the
amplitude modulation unit 2 is reduced by combining the amplitude fluctuation intensity with
the detected awareness level. Alternatively, the amplitude modulation can be stopped when the
consciousness level is reduced to some extent. In this case, the user's consciousness level can be
determined from the frequency detected by the electroencephalogram detection unit 4 as
described with reference to FIG. 7, for example. Then, when it is determined that the sleep stage
is 1, i.e., that the patient has fallen asleep, of the sleep depth obtained by reading the
electroencephalogram, control is performed to stop the output of the ultrasonic wave. For
determination of the consciousness level, a sensor capable of measuring an electrocardiogram,
respiration, body movement and the like may be prepared in addition to the brain wave, and
determination may be made from the output, and various means can be used.
[0033]
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Moreover, one embodiment as shown in FIG. 8 is also preferable. This figure is a perspective view
showing a human body holding device 5 such as a chair or bedding. In the human body holding
device 5, an ultrasonic wave oscillation unit 1 that oscillates an ultrasonic wave, an amplitude
modulation unit 2 that amplitude-modulates the ultrasonic wave to form amplitude fluctuation,
and the ultrasonic wave thus amplitude-modulated The ultrasonic wave output unit 3 emits the
air into the atmosphere, and the amplitude modulation in the amplitude modulation unit 2 is
configured such that the fluctuation of the amplitude is in a frequency band lower than the
audible range, and the ultrasonic wave output unit 3 is It is attached to the position where it
discharges toward the user of the device.
[0034]
FIG. 8 particularly shows a bed as the human body holding device 5, and the sound wave output
unit 3 is disposed at a position corresponding to the vicinity of a pillow or an ear of a human
body, more specifically, at a headboard 6 position. It is good for the user not to be aware of it.
Also in this case, the ultrasonic wave oscillation unit 1 and the amplitude modulation unit 2 may
be built in the bed main body as the ultrasonic wave output unit 3 or may be disposed outside
the main body.
[0035]
Further, in the case of the human body holding device 5 such as a chair, it is preferable that the
seat portion supporting the back surface be disposed at a position corresponding to the ear of
the human body. The ultrasonic wave oscillation unit 1 and the amplitude modulation unit 2 may
be incorporated in the chair main body as the ultrasonic wave output unit 3 or may be disposed
outside the main body. It is more preferable if it is a reclining chair in which the seat part which
supports a back is reclining in the chair for the purpose of relaxation, nap, a break, etc.
[0036]
It is a block diagram which shows the basic composition of the electroencephalogram induction
apparatus of this invention. It is a graph which shows the waveform in each block of the same
electroencephalogram induction apparatus. It is a graph explaining the nonlinear phenomenon of
a sound wave. It is a graph explaining the modulation | alteration state of the amplitude
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modulation part in one Embodiment of this invention. It is a graph explaining the modulation |
alteration state of the amplitude modulation part in one Embodiment of this invention. It is a
graph explaining the modulation | alteration state of the amplitude modulation part in one
Embodiment of this invention. It is a block diagram showing composition of an
electroencephalogram induction device in one embodiment of the present invention. It is a
perspective view showing a human body holding device which is one embodiment of the present
invention.
Explanation of sign
[0037]
Reference Signs List 1 ultrasound transmission unit 2 amplitude modulation unit 3 ultrasound
output unit 4 brain wave detection unit 5 human body holding device 6 headboard
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