JP2007228003

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DESCRIPTION JP2007228003
The present invention provides a small-sized speaker capable of increasing an output level. A
speaker (10) of the present invention comprises a support member (11), a conducting wire (12)
formed on the surface of the supporting member (11), and a magnet (16) arranged in the vicinity
of the conducting wire (12) on the surface of the supporting member. doing. Further, on the
surface of the support member 11, the magnets 16 and the like are arranged in a checkered
manner. Thus, the speaker 10 can be configured without losing the flexibility of the support
member 11. Therefore, the speaker 10 is excellent in the wearing feeling. [Selected figure] Figure
1
Speaker and judgment device
[0001]
The present invention relates to a speaker provided with a flexible support member such as cloth.
Furthermore, the present invention relates to a determination device that detects a sleep state of
a user.
[0002]
In a general speaker, a cylindrical magnet is housed inside a housing, and a coil is formed to
surround the magnet. Furthermore, a vibratory cone is glued to this coil. Then, by passing the
current amplified by the amplifier to the coil, the cone bonded to the coil vibrates, and as a result,
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a sound is generated from the cone. In the speaker having such a configuration, since the coil is
wound around the cylindrical magnet, there is a problem that thinning is difficult.
[0003]
In order to solve the above problems and to thin the speaker, a vibration cloth in which a magnet
and a conductor pattern are disposed on the surface of the cloth has been developed (Patent
Document 1 below). According to this configuration, the speaker can be thinned since all of the
components required to construct the speaker are disposed on the surface of the fabric.
Furthermore, since the structure is simple, a versatile speaker can be provided.
[0004]
On the other hand, there has also been developed a device for detecting whether the state of a
sleeping person is REM sleep or non-REM sleep in order to control the sleep state of the person
(Patent Document 2 below). According to this device, by monitoring the state of the user's sleep
and awakening at a predetermined timing, the user can be surely awakened at the rem sleep level
with a good awakening feeling. JP, 2004-357147, A JP, 2001-242268, A
[0005]
However, in the above-described speaker, it is difficult to arrange a large strong magnet on the
surface of the fabric for thinning, and it is difficult to increase the output sound level.
Furthermore, when a large number of magnets are arranged on the surface of the fabric for the
purpose of improving the output, there is a problem that the speaker is not easily bent and the
portability is deteriorated.
[0006]
Further, in the above-described device for monitoring the sleep state of the user, it is necessary
to collect experimental data using a counter or the like to monitor the sleep state of the user, and
there is a problem that its use is complicated. The
[0007]
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The present invention has been made in view of the above-mentioned problems.
The main object of the present invention is to provide a speaker that is compact and can increase
the output level. Another object of the present invention is to provide a determination device
capable of accurately monitoring a user's sleep condition.
[0008]
The present invention is disposed in a flexible support member, a conductive member formed on
the surface or inside of the support member and having a plurality of parallel straight portions,
and a region sandwiched by the straight portions of the conductive member. And a speaker for
vibrating the supporting member by passing an electric signal through the conductive member,
and the magnetic body is disposed in a checkered manner with respect to the surface direction of
the supporting member. It is characterized by
[0009]
Furthermore, according to the present invention, there is provided a flexible support member, a
conductive member formed on the surface or inside of the support member and having a
plurality of straight portions parallel to each other, and a region sandwiched by the straight
portions of the conductive member. A speaker that includes a magnetic body disposed in the
housing to cause an electric signal to pass through the conductive member to vibrate the support
member, and the support member is bent substantially parallel to the straight portion to support
the speaker. The magnetic body may be sandwiched by a member, and a plurality of the linear
portions may be disposed between the magnetic bodies.
[0010]
In the determination apparatus of the present invention, an excitation coil that receives a first
signal of a predetermined frequency to generate a magnetic field for the eye of the user, and a
detection coil that converts the magnetic field reflected by the eye to a second signal And a
detection unit configured to detect whether the user is in the state of REM sleep or in the state of
non-REM sleep based on the first signal and the second signal.
[0011]
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According to the speaker of the present invention, since the plurality of magnetic bodies are
arranged in a checkered manner on the surface of the flexible support member, even if a large
number of magnetic bodies are arranged, the support member is bent to store the speaker. The
space required for can be reduced.
In addition, it can improve the feel of the speaker and the portability.
[0012]
Furthermore, according to the speaker of the present invention, by bending the support member,
linear portions of a plurality of conductive members can be disposed between the magnetic
members.
Therefore, the operating efficiency of the speaker can be improved, and the level of the output
sound can be increased.
[0013]
Further, according to the present invention, an excitation coil for generating a magnetic field to
the eye of the user upon receiving the first signal, which is an electric signal, and a magnetic field
reflected by the eye are converted to a second signal. And a detection coil.
Then, based on the first signal and the second signal, it is detected whether the user's sleep state
is REM sleep or non-REM sleep. Therefore, the sleep condition of the user can be accurately
monitored with the simplified configuration.
[0014]
First Embodiment In the present embodiment, the speaker 10 of the present embodiment will be
described with reference to FIGS. 1 to 6.
[0015]
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The basic configuration of the speaker 10 according to this embodiment will be described with
reference to FIG.
FIG. 1 (A) is a plan view of the speaker 10 as viewed from above, FIG. 1 (B) is an enlarged plan
view of essential parts, and FIG. 1 (C) is a cross-sectional view of FIG. .
[0016]
With reference to FIG. 1A, the speaker 10 is disposed in the vicinity of the support member 11,
the conducting wire 12 (conductive member) formed on the surface of the supporting member
11, and the conducting wire 12 on the surface of the support member 11. The magnet 16
(magnetic material) is provided.
[0017]
The support member 11 is made of non-woven fabric, woven fabric or the like, supports the
entire speaker 10 and has a function of vibrating to generate a desired sound.
The material of the support member 11 is not limited to cloth only, and other materials such as
paper and resin sheet may be adopted as the support member 11, for example.
[0018]
The advantage of this embodiment is that a material having a good touch, such as a cloth, is used
as the support member 11. Therefore, when the speaker 10 of the present embodiment is
applied to headphones, the uncomfortable feeling worn by the user using the headphones during
use is reduced. Furthermore, since the speaker 10 can be bent or wound at any place, its
storability and portability can be improved.
[0019]
As described above, the support member 11 mechanically supports the entire speaker 10 and
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also functions as a vibrating membrane that vibrates to generate sound. From this, the support
member 11 needs some mechanical strength to function as a vibrating membrane. Therefore,
when the support member 11 is made of cloth, it is necessary to glue and reinforce at least the
portion of the support member 11 where the magnets 16 and 17 are disposed.
[0020]
A plurality of magnets 16 and 17 are spaced apart from each other on the surface of the support
member 11. Here, a large number of magnets 16 and 17 are disposed over the entire surface of
the support member 11. Referring to FIG. 1C, the magnets 16A and the like are bonded to the
upper surface of the support member 11 with an adhesive or the like, but these magnets may be
positioned inside the thickness direction of the support member 11 . In the present embodiment,
a small, substantially button-shaped (cylindrical) one is adopted as the magnet 16A and the like.
[0021]
Here, the magnet 16 is a permanent magnet whose top surface is a north pole (or south pole),
and the magnet 17 is a permanent magnet whose top surface is a south pole (or north pole). That
is, the polarity of the surface differs between the magnet 16 and the magnet 17.
[0022]
The conducting wire 12 is, for example, a copper wire coated with a resin film, and so-called
enameled wire or formal wire can be adopted. The conducting wire 12 has a plurality of linear
portions 13 linearly extending, and these linear portions 13 are folded back and connected to be
arranged in parallel at substantially equal intervals. Here, the conductive wire 12 may be
attached to the surface or the back surface of the support member 11 via an adhesive, may be
sewn into the support member 11, or may be sandwiched by the support member 11.
Furthermore, terminals 14 and 15 are formed at both ends of the conducting wire 12, and the
insulating film covering the periphery of the copper wire is removed at this part. Here, the lead
12 can be disposed at a predetermined position of the support member 11 by using the upper
thread or the lower thread or both of them used for the industrial sewing machine or the like as
the lead 12.
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[0023]
When a current based on audio data is supplied to the terminals 14 and 15 of the speaker 10
having the above-described schematic configuration, the support member 11 vibrates and a
predetermined sound is generated.
[0024]
Referring to FIG. 1 (B), in the present embodiment, magnets arranged on the surface of support
member 11 are arranged in a checkered manner.
This configuration can improve the flexibility of the entire speaker 10. Specifically, in the present
embodiment, the magnet 16 whose top surface is the N pole and the magnet 17 whose top
surface is the S pole are positioned across the linear portion 13 of the conducting wire 12. And,
in the direction in which the straight portion 13 extends, the place where the magnet 16 is
disposed and the place where the magnet 17 is disposed are different. By arranging the magnets
16 and 17 in a checkered manner as described above, a row of aligned hard magnets is not
formed, so suppressing the decrease in flexibility of the speaker 10 by arranging the magnets on
the support member 11 Can. Therefore, the feel of the speaker 10 is improved, and the speaker
10 can be easily folded to improve portability.
[0025]
On the other hand, it is also possible to align the magnets 16 and 17 in a matrix, but in this case,
a hard portion is formed by the aligned magnets, which may cause problems such as a decrease
in the touch of the speaker 10 There is.
[0026]
FIG. 1C is a cross-sectional view of the speaker 10 of the present embodiment.
In the support member 11, linear portions 13A to 13F of the conducting wire 12 are disposed at
predetermined intervals. Here, current flows from the top to the bottom of the drawing in the
linear portions 13A, 13C, and 13E. Then, current flows from the bottom to the top of the drawing
in the straight portions 13B, 13D, and 13F. That is, in the adjacent linear portions, the flow
direction of the current is opposite.
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[0027]
Further, a magnet is disposed on the surface of the support member 11. Here, the upper surfaces
of the magnets 16A, 16B, and 16C are S poles, and the lower surfaces are N poles. The upper
surface of the magnets 17A and 17B is an N pole, and the lower surface is an S pole. That is, the
magnets adjacent to each other across the linear portion 13A or the like of the lead 12 have
opposite polarities.
[0028]
With the above configuration, magnetic lines of force are formed between adjacent magnets.
Here, the lines of magnetic force are shown by dotted lines, and the directions of the lines of
magnetic force are shown by arrows. For example, the magnetic lines of force generated from the
N pole of the lower surface of the leftmost magnet 16A reach the S pole of the lower surface of
the adjacent magnet 17A. Furthermore, magnetic lines of force generated from the N pole on the
top surface of the magnet 17A reach the S pole on the top surface of the adjacent magnets 16A
and 16B.
[0029]
As described above, by making the polarities of the magnets (for example, the magnet 16A and
the magnet 17A) adjacent to each other across the linear portion 13A different from each other,
a strong magnetic field can be generated in the direction crossing the linear portion 13B. This
contributes to the improvement of the output level of the speaker 10.
[0030]
Details of generation of sound from the speaker 10 by supplying current to the lead 12 are as
follows. Taking the linear portion 13B as an example, first, an electrical signal based on an audio
signal flows from the bottom to the top of the linear portion 13B in the drawing. In addition, a
magnetic field that crosses laterally in the right direction on the paper surface acts on the linear
portion 13B. Therefore, according to Fleming's left-hand rule, the upward lifting force acts on the
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straight portion 13B, and as a result, the upward force acts on the support member 11 near the
straight portion 13B. In the figure, this direction is indicated by an arrow. Here, the weight of the
support member 11 near the straight portion 13B is lighter than that of the magnet 16A. From
this, the support member 11 around the straight portion 13B vibrates to generate a sound.
[0031]
The details from the supply of the electrical signal to the vibration of the support member 11 are
the same as for the other straight portions 13C and the like. Therefore, when an electrical signal
based on the audio signal is supplied from the terminals 14 and 15 to the speaker 10, the
support member 11 at the periphery of the straight portions 13A to 13F vibrates to generate a
predetermined sound.
[0032]
Next, with reference to FIG. 2, the configuration of the speaker 10 having a configuration in
which the output level is increased will be described. Generally speaking, methods of increasing
the output level of the speaker may be a method of strengthening the magnet, a method of
increasing the current flowing through the lead (coil), and a method of increasing the number of
turns of the lead. However, the method of strengthening the magnet requires a large magnet,
which hinders the miniaturization of the speaker and is difficult to apply to this embodiment.
Further, the method of increasing the current requires connection with a large battery or an
external power supply, and is difficult to apply to this embodiment in which a portable device
such as an eye mask is a main object. Therefore, in the present embodiment, the output level of
the speaker 10 is improved by increasing the number of turns of the conducting wire 12.
[0033]
FIG. 2A is a perspective view showing a state in which the support member 11 is broken, FIG. 2B
is a cross-sectional view thereof, and FIG. 2C is a cross-sectional view showing a speaker 10 of
another form. .
[0034]
Referring to FIG. 2A, in the present embodiment, the middle portion of the support member 11 is
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bent in parallel with the linear portion 13 so that a magnet (not shown) is encased.
By this, the number of linear parts existing between magnets can be increased, and as a result,
the output level of the speaker 10 can be improved. Therefore, since the increase in the number
of magnets is not accompanied, the increase in cost is suppressed, and the increase in power
consumption is reduced because a large amount of power is not required.
[0035]
Referring to FIG. 2B, support member 11 is bent, and both the upper and lower surfaces of
magnet 16A and the like face support member 11. Here, linear portions 13A to 13E are disposed
below the magnets. Furthermore, linear portions 13F to 13J are disposed above the linear
portions 13A to 13E. Here, the upper and lower surfaces of the magnet are adhered to the
support member 11.
[0036]
Therefore, for example, in the region between the magnet 16A and the magnet 17A, the linear
portion 13B (first linear portion) is positioned below and the linear portion 13G (second linear
portion) is positioned above. There is. And in the straight part 13B and the straight part 13G, the
direction of the magnetic line of force to cross is the opposite direction, and the direction of the
passing current is also different. Specifically, the magnetic force in the left direction on the paper
surface acts on the linear portion 13G located on the upper side, and the magnetic force in the
right direction on the paper surface acts on the linear portion 13B located on the lower side.
Further, a current flows from the top to the bottom on the drawing in the linear portion 13G, and
a current flows from the top to the top in the drawing on the linear portion 13B. As a result, an
upward force acts on both the linear portions 13G and 13B in the drawing, and the support
members 11 in the vicinity thereof vibrate to generate a sound.
[0037]
Such a configuration is the same for other straight portions disposed in pairs between the
magnets. Therefore, with the supply of the current, an upward force acts on all the straight
portions, and as a result, the support member 11 vibrates to generate a sound.
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[0038]
As described above, by bending the support member 11, a plurality of straight portions 13A and
the like are disposed between the magnets, and the same effect as in the case where the number
of turns of a general speaker coil is increased can be obtained. .
[0039]
Referring to FIG. 2C, here, the support member 11 is folded in four.
With this configuration, more linear portions can be disposed between the magnets, and the
output of the speaker 10 can be further improved. Here, the output of the speaker 10 may be
further improved by bending the support member 11 eightfold or more.
[0040]
Here, the linear portions 13F to 13J are disposed above the magnets, and the linear portions 13P
to 13T are further disposed above them. Furthermore, the directions of the magnetic fields acting
on these straight sections are each the same. For example, the direction of the magnetic field
acting on the linear portion 13F and the direction of the magnetic field acting on the linear
portion 13P located above the same are the same, and are indicated by magnetic lines directed to
the right. Therefore, the direction of the current passing through the linear portion 13F and the
direction of the current passing through the linear portion 13P may be the same (the direction of
flowing downward in the drawing). The same applies to other combinations of straight portions
(for example, straight portion 13Q and straight portion 13G).
[0041]
Furthermore, linear portions 13A to 13E are located below the magnets, and linear portions 13K
to 13O are located below these. Also in this case, for example, in the straight portion 13A and the
straight portion 13K, the current flows in the same direction. This matter is the same as the
combination of the other linear portions (for example, the linear portion 13B and the linear
portion 13L).
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[0042]
Another configuration for improving the output of the speaker 10 will be described with
reference to FIG. Here, in order to improve the output, the linear portions of the conducting wires
are densely arranged. For example, two linear portions 13B are disposed below the magnet 16A
and the magnet 17A. Furthermore, two straight portions 13G are disposed above. That is,
between the magnets, two upper and lower each (four in total) straight portions are arranged.
Such a configuration also increases the output of the speaker 10 because the substantial number
of the leads (corresponding to the number of turns of the coil) increases. Furthermore, as
compared with the above-described method of bending the support member 11, a large number
of straight portions are formed on one support member 11 facing the magnet, so that the
distance between the magnet and the straight portion becomes short and the straight portion
The acting magnetic field can be increased. This further contributes to the improvement of the
output of the speaker 10.
[0043]
The structure of the speaker 10 of the further another form is demonstrated with reference to
FIG. 3 (B). Here, the lead 12A and the lead 12B are formed on the front and back surfaces of the
support member 11 made of a soft vibrating membrane (for example, a membrane made of
resin). The conducting wires 12A and 12B are formed by exposure and development using
printing technology. In the figure, the lead 12A disposed on the upper surface of the support
member 11 is indicated by a solid line, and the lead 12B disposed on the lower surface of the
support member 11 is indicated by a dotted line. Moreover, the linear part 13 extended linearly
with both conducting wire 12A, 12B is formed. The conducting wire 12A and the conducting
wire 12B penetrate through the support member 11 at the point P and are electrically connected.
Here, for convenience of drawing, the straight portions 13 of the conducting wire 12A and the
conducting wire 12B are shown being shifted, but in actuality, the positions of the straight
portions 13 of the conducting wire 12A and the conducting wire 12B overlap.
[0044]
By employing the above configuration, the plurality of straight portions 13 can be positioned
between the magnet 16 and the magnet 17, so that the output of the speaker 10 can be
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improved. Here, when the diaphragm is formed in multiple layers, the output of the speaker can
be further improved. Furthermore, as shown in FIG. 3A, on each surface, a large number of
straight portions may be disposed between the magnets.
[0045]
Next, the results of experiments conducted to verify the performance of the speaker 10 will be
described with reference to FIGS. 4 to 6. FIG. 4 is a diagram showing the conditions of this
experiment, and FIGS. 5 and 6 are graphs showing the results of this experiment.
[0046]
The conditions of the present experiment will be described with reference to FIG. 4. First, the
cloth-like speaker 10 of the present embodiment is placed on the surface of the sound absorbing
material 21 that absorbs sound. Here, the speaker 10 is mounted on the upper surface of the
sound absorbing material 21 with the surface on which the conducting wire 12 is formed as the
upper surface.
[0047]
A microphone 20 is disposed above the speaker 10. This experiment was performed by
measuring the sound generated from the speaker 10 with the microphone 20.
[0048]
FIG. 5A is a graph showing the results of an experiment conducted with the microphone 20
separated from the speaker 10 by 1 cm. The horizontal axis of this graph shows the frequency of
the measured sound, and the vertical axis shows the relative amplitude. Referring to this figure, it
was possible to obtain a substantially flat frequency characteristic in the region of 1.5 kHz to 20
kHz within the voice band of 20 Hz to 20 kHz. This means that the speaker 10 of this
embodiment is an electrical signal-to-sound pressure conversion device with little distortion with
respect to the input electrical signal.
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[0049]
FIG. 5 (B) is a graph showing an experimental result when the distance between the speaker 10
and the microphone is 20 cm. The results shown in this graph are also the same as above. That
is, even at a location 20 cm away from the speaker 10, an audio signal with little distortion
corresponding to the input electric signal is generated.
[0050]
FIG. 6A is a graph showing experimental results in a state in which the microphone 20 and the
speaker 10 are separated by 1 cm by reversing the front and back of the speaker 10. In this
graph, a notch occurs at a frequency near 4.0 kHz, which is caused by the reflection between the
surface of the flat cloth of the speaker 10 and the microphone. Therefore, a substantially flat
frequency characteristic is observed in the region of 1.5 kHz to 20 kHz, and it can be read that
an audio signal with little distortion corresponding to the input electrical signal is generated.
[0051]
FIG. 6B is a graph showing experimental results in a state in which the microphone 20 and the
speaker 10 are separated by 20 cm by reversing the front and back of the speaker 10. Also from
this graph, a substantially flat frequency characteristic is seen in the region of 1.5 kHz to 20 kHz.
[0052]
From the above experimental results, when the speaker 10 of this embodiment is used, it is
possible to obtain a sound in which the input electric signal is faithfully reproduced on the back
surface and on the front surface. Furthermore, it is possible to obtain a sound in which the input
electric signal is faithfully reproduced even at a position close to the speaker 10 or at a position
apart from it.
[0053]
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The speaker 10 according to the present embodiment is applicable to, for example, goggles,
bandana type speakers, hat type speakers, towel type speakers and the like. Furthermore, by
applying the speaker 10 of the present embodiment to a headset, it can be used to transmit a
pacemaker and supervision instruction during a competition.
[0054]
Furthermore, according to the speaker 10 of the present embodiment, since the support member
11 made of cloth or the like can be brought into direct contact with the user's ear, sound leakage
can be reduced.
[0055]
Second Embodiment In this embodiment, with reference to FIG. 7 and FIG. 8, a determination
device 29 that determines whether the user's sleep state is REM sleep or non-REM sleep will be
described.
[0056]
Here, REM sleep means a state of light sleep.
Therefore, during REM sleep, the body and brain are in a state of awakening a little, and are in a
state of hitting over and dreaming.
On the other hand, non-REM sleep means a deep sleep state. Therefore, during non-REM sleep,
the body and brain are at rest, and the body is hardly moving except for trachea related to living
things such as breathing. The human sleep cycle repeats REM sleep and non-REM sleep once
every one and a half hours. It is said that the reason for this repetition is to protect oneself from
the outside or to organize the memory that was on the previous day.
[0057]
The movement of human eyes hardly moves during non-REM sleep, but vibrates finely and finely
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during REM sleep. In this embodiment, by generating magnetism from the coil and monitoring
the movement of the eye, it is determined whether the sleep state of the user is the REM sleep
state or the non-REM sleep state.
[0058]
The configuration and the like of the determination device 29 of the present embodiment will be
described with reference to FIG. FIG. 7A and FIG. 7B are views showing the outline of the
determination device 29, and FIG. 7C is a block diagram showing the electrical configuration of
the determination device 29. As shown in FIG.
[0059]
Referring to FIG. 7A, determination apparatus 29 of the present embodiment includes excitation
coil 40 for generating a magnetic field, and detection coil 41 for converting the magnetic field
reflected by eye 39 of the user into an electrical signal. ing. The coil 40 and the coil 41 are
provided to overlap on a base material 42 such as cloth.
[0060]
The coil 40 receives a first signal of a predetermined frequency, and as a result, a magnetic field
is generated. Here, the magnetic field generated from the coil 40 is indicated by magnetic lines of
force 37. The magnetic field lines 37 reach the eye 39 of the user.
[0061]
The coil 41 has a function of converting the magnetic field reflected by the eye 39 of the user
into a second signal which is a current. The second signal generated by the coil 41 is input to a
control unit (detection unit) (not shown), and is compared with the first signal in the control unit.
It is determined whether it is in the state of non-REM sleep.
[0062]
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In this embodiment, since the planar positions of the coil 40 and the coil 41 overlap, the planar
size of the determination device 29 can be miniaturized. Furthermore, the efficiency of
converting the magnetic field reflected by the eye 39 into current by the coil 41 can be
improved.
[0063]
Referring to FIG. 7B, in the present embodiment, the coil 40 and the coil 41 do not necessarily
have to be formed at overlapping positions on the base material 42, and they are not overlapping
It may be arranged at the position). Even in such a positional relationship, the magnetic field
generated from the exciting coil 40 is reflected by the surface of the eye 39, and the reflected
magnetic field is detected by the detecting coil 41.
[0064]
The electrical configuration of the determination device 29 of the present embodiment will be
described with reference to FIG. 7 (C). The determination device 29 mainly includes a
microcomputer 30 that processes an electrical signal, an amplification unit 35 that amplifies the
output of the microcomputer 30, coils 40 and 41, and an amplification unit 36 that amplifies the
electric signal of the coil 41.
[0065]
The microcomputer 30 has a function of generating a first signal of a predetermined frequency,
and further comparing a second signal input from the outside with the first signal. The functions
of the microcomputer 30 may be realized by software incorporated in the microcomputer, or all
of them may be realized by analog components. Further, the microcomputer 30 mainly includes
an oscillating unit 31, a comparing unit 32, a DA converter 33, and an AD converter 34.
[0066]
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The oscillating unit 31 generates a digital signal (first digital signal) indicating a predetermined
frequency by a program incorporated in the microcomputer 30. This digital signal is sent to the
DA converter 33.
[0067]
The DA conversion unit 33 performs DA conversion (digital-analog conversion) on the first digital
signal sent from the oscillation unit 31, and generates a first signal that is an analog sine wave
signal of a predetermined frequency. The generated first signal is sent to the amplification unit
35 located outside the microcomputer 30.
[0068]
The amplification unit 35 amplifies this first signal, and the amplified first signal is supplied to
the coil 40. As a result, alternating magnetic field lines 37 based on the input first signal are
generated from the coil 40. The magnetic field lines 37 reach and reflect the eye 39 of the user.
Then, the reflected magnetic force lines 38 propagate to the detection coil 41.
[0069]
In the detection coil 41, an electromotive force is generated by the magnetic field lines 38
reflected by the eye, and a second signal which is an analog signal is generated. Here, the second
signal generated by the coil 41 is out of phase with the first signal.
[0070]
The amplification unit 36 is a differential amplifier and has a function of amplifying a weak
second signal input from the detection coil 41. The amplified second signal is sent to the AD
converter 34 in the microcomputer 30.
[0071]
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The AD converter 34 converts the input second signal into a digital signal (second digital signal).
The obtained second digital signal is sent to the comparison unit 32.
[0072]
The comparison unit 32 compares the phase difference between the first digital signal and the
second digital signal. When the phase difference changes, the frequency of the first digital signal
generated by the oscillating unit 31 is changed to bring the phase difference close to the original
value. By this, the phase difference can be grasped as a change of the frequency of the first
digital signal.
[0073]
In this embodiment, based on the change in the frequency of the first digital signal, it is
determined whether the sleep state of the user is the REM sleep state or the non-REM sleep state.
That is, if the frequency of the first digital signal does not change, or if the change is less than a
predetermined range, it is determined that the user is in the non-REM sleep state. On the other
hand, if the frequency of the first digital signal changes, or if the change is above a
predetermined range, it is determined that the user is in the REM sleep state.
[0074]
Furthermore, in the present embodiment, when it is determined that the user is in REM sleep
state, the time for transitioning from REM sleep to non-REM sleep is determined, and before this
time, a sound for awakening the user is generated. To make it happen (waking means). Human
beings are said to be able to wake up clearly when transitioning from REM sleep state to nonREM sleep state. Therefore, in the present embodiment, the time when the non-REM sleep state
transitions to the REM sleep state is sensed, and the user is awakened before the transition from
the REM sleep state to the non-REM sleep state. This can make the awakening of the user clear.
That is, the awakening device can be configured by the determination device 29 of the present
embodiment. Furthermore, for example, a "droplet falling sound" or a "monotonous slow artificial
sound" can be generated to create a situation in which the user's sleep can easily shift to nonREM sleep. In this case, the sleep introduction device is configured by the determination device
29 of the present embodiment.
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[0075]
On the other hand, when it is determined that the user is in the non-REM sleep state, since the
user is in the deep sleep state, the generation of the above-described sound is stopped.
[0076]
Furthermore, the cycle of the REM sleep state and the non-REM sleep state can be recorded by
recording the time of transition from the REM sleep state to the non-REM sleep and the time of
transition from the non-REM sleep state to the REM sleep state.
The cycle of REM sleep state and non-REM sleep state is associated with diseases such as
depression. In this case, the determination device 29 of the present embodiment can be used as a
medical monitor.
[0077]
Referring to the graph of FIG. 8, the method of determining the sleep state of the user using the
phase difference of the signals will be described in detail. The horizontal axis of the graph shown
in this figure indicates the frequency f of the first digital signal, and the vertical axis indicates the
phase difference θ between the first digital signal and the second digital signal.
[0078]
As described above, the first digital signal for generating the alternating signal generated by the
oscillating unit 31 of the microcomputer 30 and the second digital signal based on the magnetic
lines of force reflected by the eye 39 have different phases. The phase difference changes in
accordance with the distance between the coils 40 and 41 and the eye 39. Further, as can be
read from the graph, when the frequency f of the first digital signal is increased, the phase
difference θ increases (or may decrease). That is, the frequency f of the first digital signal and
the phase difference θ have a linear relationship.
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[0079]
First, assuming that the phase difference at the initial frequency f0 is θ0, if the distance between
the coil and the eyeball is constant (if the user is in the non-REM sleep state), the phase
difference θ also changes if the frequency f is changed. Here, this change is indicated by a line
segment L0.
[0080]
Here, when the user is in the REM sleep state, the eye movement moves, and the distance
between the eye and the coil changes, the phase difference tries to move slightly from, for
example, θ0 to θ1. The reason for this is that when the eye 39 moves, the length of the path of
coil 40 → eye 39 → coil 41 changes. In this embodiment, the change in the phase difference is
detected, and the transmission frequency of the first digital signal is moved so that the moved
θ1 returns to θ0. Here, the frequency f of the first digital signal is changed from f0 to f1 in the
low frequency direction so that θ1 becomes θ0.
[0081]
As described above, by changing the frequency of the first digital signal so that the phase
difference is restored, it is possible to capture a small change in the phase difference as a large
frequency shift. That is, the determination apparatus described above can also be regarded as a
converter that converts a change in the distance between the eye and the coil (movement of the
eye) into a change in the frequency of the first digital signal.
[0082]
By using the determination device of this embodiment, even if noise is mixed in the output of the
coil, it is possible to reliably determine the sleep state of the user. That is, if it is going to monitor
a user's sleep condition directly from the output of a coil, since the output of a coil will receive to
the influence of various noises, it will become difficult to monitor a user's sleep condition. In this
embodiment, as described above, the movement of the eye is monitored by replacing the output
of the weak coil with a change in the frequency of a large digital signal. Therefore, it can be
accurately determined whether the user's sleep state is REM sleep state or non-REM sleep state.
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[0083]
Furthermore, the determination apparatus of the present embodiment is smaller and non-contact
as compared with a conventional large-scale system in which the user is provided with a large
number of probes and the brain waves are measured, and can be used for each user.
[0084]
Third Embodiment With reference to FIG. 9, an application example of the above-described
determination device 29 and the like will be described.
Here, the eye mask 50 is configured by combining the speaker 10 and the determination device
29 described above. Here, instead of the eye mask 50, a bandana-type sleep assist device, a hattype sleep assist device, a towel-type sleep assist device, an acoustic system, or the like may be
configured.
[0085]
The eye mask 50 is worn so as to close the eyes and ears of the user, the judgment device 29 is
provided at the position of the eyeballs of the user, and the speaker 10 is provided at the position
of the ears. By wearing such an eye mask 50, for example, the user's sleep can be made
comfortable. In addition, the eye mask 50 is equipped with a battery, a microcomputer, a timer,
etc. (not shown).
[0086]
The specific operation of the eye mask 50 is as follows. First, the determination device 29
monitors the sleep state of the user and determines whether the user's sleep state is the REM
sleep state or the non-REM sleep state. Then, based on the output of the determination device 29,
the speaker 10, a lighting device (not shown) and the like operate to make the user's sleep
comfortable.
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[0087]
When the user is in the REM sleep state, the speaker 10 generates a good sound around the ear,
such as a "water dripping sound", for introduction to deep sleep. Furthermore, a lighting device
such as an LED (not shown) may be mounted on the upper portion of the eye mask 50, and the
user may be irradiated with light from the LED together with the speaker 10. This makes it
possible to create a situation in which the user can easily shift to a deep sleep.
[0088]
Furthermore, by combining the determination device 29 and the timer, when the user transitions
from the REM sleep state to the non-REM sleep state, a predetermined sound can be generated
from the speaker 10 and the user can wake up comfortably.
[0089]
Further, the eye mask 50 of the present embodiment is made of a soft cloth as a whole, and
furthermore, the magnets contained in the speaker 10 are arranged in a checkered manner.
Therefore, the eye mask 50 is very lightweight, fits well on the head of the user, and has a
configuration with almost no wearing feeling.
[0090]
Furthermore, according to the eye mask 50 of the present embodiment, it is possible to record
and feedback after measuring the cycle of the REM sleep and non-REM sleep cycles of the user,
the individual difference, and the daily fluctuation. As a result, the sleep awake time can be
accurately calculated to wake the user more comfortably.
[0091]
It is a figure which shows an example of the speaker of this invention, (A) is a top view, (B) is the
expanded top view, (C) is sectional drawing. It is a figure which shows an example of the speaker
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of this invention, (A) is a perspective view, (B) is a sectional view, (C) is a sectional view. It is a
sectional view showing an example of a speaker of the present invention, (A) is a sectional view,
and (B) is a top view. It is sectional drawing which shows the outline ¦ summary of the
experiment conducted in order to verify the speaker of this invention. (A) and (B) is a graph
which shows the experimental result performed in order to verify the speaker of this invention.
(A) and (B) is a graph which shows the experimental result performed in order to verify the
speaker of this invention. It is a figure which shows the structure of the determination apparatus
of this invention, (A) is a perspective view, (B) is a top view, (C) is a block diagram. It is a graph
which shows the determination method by the determination apparatus of this invention. It is a
figure which shows the eye mask to which the determination apparatus etc. of this invention
were applied.
Explanation of sign
[0092]
DESCRIPTION OF SYMBOLS 10 Speaker 11 Support member 12 Conductor 13 Straight part 14
Terminal 15 Terminal 16 Magnet 17 Magnet 20 Microphone 21 Sound absorbing material 29
Judgment device 30 Microcomputer 31 Oscillator 32 Comparison unit 33 DA converter 34 AD
converter 35 Amplifier 36 Amplifier 37 38 reflected magnetic field line 39 eye 40 coil 41 coil 42
base 50 eye mask
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