JP2768024B2 - Sleep detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleep detecting device for detecting sleep.

[0002]

2. Description of the Related Art Conventionally, this kind of sleep detecting apparatus detects a sleep by performing a waveform processing of a detection signal by detecting, for example, an electroencephalogram or eye movement of a human body (Japanese Patent Laid-Open No. Sho 62-2553034).
Japanese Patent Application Laid-Open No. 63-1500) and a method in which a pulse wave of a human body is detected and the waveform of a detection signal is processed to determine falling asleep.
No. 47 gazette), and as shown in FIG. 10, detecting means 1 for detecting biological signals such as brain waves, eye movements, and pulse waves.
A signal processing means 2 for processing a signal from the detection means 1
And determination means 3 for determining whether or not to fall asleep based on the output of the signal processing means 2.

[0003]

However, in the above-mentioned conventional configuration, since the detecting means 1 for detecting brain waves, eye movements, pulse waves, etc. is directly mounted on the scalp or skin of a human body, there is a sense of discomfort due to the mounting. There was a problem that sleep was disturbed.

A first object of the present invention is to mount the above detecting means on a human body by detecting a body motion pattern of the human body at bedtime without contact with the human body. It is to detect falling asleep easily without contact without contact.

A second object is to reliably detect a body motion by allowing a user to arbitrarily set a set value for detecting the body motion in consideration of individual differences in the size of the body motion. To detect falling asleep.

A third object of the present invention is to store a magnitude of a body motion sequentially, thereby learning a set value for detecting the body motion, and reliably detect the body motion to detect falling asleep.

A fourth object is to reliably detect falling asleep by allowing a user to arbitrarily set a set value for detecting a falling asleep from a body movement pattern in consideration of individual differences in a body movement pattern. It is in.

A fifth object is to detect a falling asleep reliably by learning a set value for detecting a falling asleep by sequentially storing body movement patterns.

[0009]

In order to achieve the first object, the present invention provides a piezoelectric element disposed on bedding, and a filter for filtering a specific frequency component of a signal of the piezoelectric element. An amplifier for amplifying the signal of the filter;
A rectifier for rectifying the signal of the amplifier, an integrator for integrating the signal of the rectifier per predetermined time , and a human body on the bedding when a signal level of the integrator is less than a predetermined first set value. Absent determining means for determining that there is no human body, and a human body resting on the bedding when the signal level of the integrator is equal to or more than the first set value and less than a predetermined second set value. Bed determination means for determining that the human body is present in the body, body movement determination means for determining that the human body has caused body movement on the bedding when the signal level of the integrator is equal to or more than the second set value, There is a timer that starts a timekeeping operation in response to a signal from the presence determination means and resets the timekeeping operation in response to a signal from the absence determination means or the body movement determination means, and a timekeeping time measured by the timer. Ecklonia human body on the bedding when exceeds the setting time determined is composed of a determined sleep onset determination means that there was input Nemushi.

In order to achieve the second object, the present invention provides a display means for displaying the signal level of the integrator, and the first set value and the second set value based on the contents displayed on the display means. And setting means capable of manually setting the set value of.

In order to achieve the third object, the present invention provides a storage means for sampling and storing a signal level of the integrator at a predetermined cycle, and a minimum value of storage contents stored in the storage means. And a calculating means for calculating the maximum value and the maximum value, and setting means for setting the minimum value to the first set value and the maximum value to the second set value.

In order to achieve a fourth object, the present invention has a setting means capable of manually changing the set time.

Further, in order to achieve the fifth object, the present invention provides a method for measuring the time counted by the timer each time the time counting operation of the timer is reset by the signal of the absence determining means or the body movement determining means. Storage means for storing, first calculating means for calculating the frequency distribution of the measured time stored in the storage means, and a ratio between the cumulative frequency up to a certain time T and the total cumulative frequency in the frequency distribution is predetermined. The second time which is obtained by calculating the time T so as to be a certain value.
And setting means for setting the time T as the set time by performing the above-mentioned storage and calculation operations at regular intervals.

[0014]

The present invention operates as follows by the above configuration. Here, the body motion of the human body when the human body is present on the bedding is defined separately in the following two. The minute body movements propagated by the activity of the heart and respiration of the human body are referred to as fine body movements, and large body movements such as entering the bed, getting up, and turning over are referred to as coarse body movements. When the piezoelectric element disposed on the bedding is deformed by the fine body movement and the coarse body movement as described above, a voltage is generated from the piezoelectric element according to the degree of the deformation. This output signal is filtered by a filter, then amplified by an amplifier, rectified by a rectifier , and further processed by an integrator.
It is integrated per fixed time . In the integrator, a high-level output is obtained when the above-described coarse body motion occurs, and a low-level output is obtained by the above-described fine body motion when the body is at rest and in a resting state. Based on this fact, the following determination is made according to the signal level of the integrator. That is, when the signal level of the integrator is less than the first predetermined value, the absence determining means determines that no human body exists on the bedding. When the signal level of the integrator is equal to or higher than the first set value and lower than a predetermined second set value, it is determined by the on-bed determination means that the human body is present on the bed in a resting state. When the signal level of the integrator is equal to or higher than the second set value, the body movement determining means determines that the human body has caused body movement on the bedding. Next, when there is a signal from the occupancy determination means, the timer starts a time counting operation. However, this timing operation is reset by a signal from the absence determining means or the body movement determining means. Then, if the time measured by the timer exceeds a predetermined set time, the sleep determining means determines that the human body has fallen asleep on the bedding.

Further, according to the present invention, the first set value and the second set value are manually set based on the signal level of the integrator displayed on the display means.

Further, according to the present invention, when the signal level of the integrator is stored by the storage means, the minimum value and the maximum value of the stored contents are calculated, and the minimum value and the maximum value are respectively set to the first set value and the first value. This is the second set value.

Further, according to the present invention, the set time is manually changed. Further, in the present invention, each time the timer operation of the timer is reset by the signal of the absence determination means or the body movement determination means, the time measured by the timer is stored. Then, the frequency distribution of the stored time is calculated, and in the calculated frequency distribution, a certain time T
Time T is calculated so that the ratio of the cumulative frequency up to and the total cumulative frequency becomes a predetermined value, and time T is set as the set time.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view when the present embodiment is mounted on a bed, and FIG. 2 is a block diagram. 1 and 2, reference numeral 4 denotes a piezoelectric element made of polyvinylidene fluoride (PVD).
F) or the like is formed into a thin film of a polymer piezoelectric material, and a flexible electrode film is adhered to both surfaces thereof and formed into a tape shape, and is fixed to the surface of the mattress 15 as shown in FIG. Reference numeral 5 denotes a circuit unit, which includes a filter 6, an amplifier 7, a rectifier 8, an integrator 9, an absence judging unit 10, an occupancy judging unit 11, a body movement judging unit 12, a timer 13, and a sleep judging unit 14 (not shown in FIG. 1). ) Built-in. The piezoelectric element 4 and the circuit unit 5 are connected by a shield wire 16.

According to the configuration of this embodiment, the present invention operates as follows. When a human body is present on the bedding and the piezoelectric element 4 is deformed by the fine body movement and the coarse body movement as described above, a voltage is generated from the piezoelectric element 4 according to the degree of the deformation. 3a and 3b show actual output signals from the piezoelectric element 4. FIG. The large-level signal in FIG. 3A is for a rough movement such as entering the bed, turning over, or leaving the bed. FIG. 3b
FIG. 3A is an enlarged waveform diagram of FIG. 3A. When the human body is in bed and kept in a resting state, fine body motion, that is, minute body motion propagated by the heart activity and respiratory activity of the human body is illustrated. 3
As shown by b, it is detected by the piezoelectric element 4.

The output signal of the piezoelectric element 4 is passed through a filter 6 by a component of about 1 to about 10 Hz, amplified by an amplifier 7, then rectified by a rectifier 8 and given a predetermined time by an integrator 9.
Is integrated . FIG. 4 shows an output signal from the integrator 9 when a person actually goes to bed. As shown in the figure, a large signal is generated when rough movements such as entering the bed, turning over, leaving the bed occur.
In other resting states, a signal with a low level is obtained by the above-mentioned fine body movement. If no human body exists, the signal level becomes zero. Based on this, the following determination is made according to the signal level of the integrator 9. That is,
If the signal level of the integrator 9 is lower than a predetermined first set value (Va in FIG. 4), the absence determination means 1
By 0, it is determined that no human body exists on the bed. When the signal level of the integrator 9 is equal to or higher than the first set value Va and lower than a predetermined second set value (Vb in FIG. 4), the human body rests on the bed by the on-bed determination means 11. It is determined that it exists in the state. When the signal level of the integrator 9 is equal to or higher than the second set value Vb, the body motion determining means 12 determines that the human body has caused a coarse body motion on the bed.

Next, when there is a signal from the occupancy determination means 11, the timer 13 starts a time counting operation. However, this timing operation is reset by a signal from the absence determination means 10 or the body movement determination means 12. If the time measured by the timer 13 exceeds a predetermined time T, the sleep determining means 14 determines that the human body falls asleep on the bed. Here, the above set time T
Regarding the determination of the following, the inventors conducted the following study on the relationship between the rough movement and the sleep state. That is,
Based on the finding that the body motion disappears when falling asleep, the relationship between the duration of the resting state without the coarse body motion and the probability that the sleeping person falls asleep in that state was obtained by a sleep experiment. The result is shown in FIG. The abscissa in the figure indicates the duration of the resting state, and the left ordinate indicates the probability of the subject falling asleep when the resting state continues for a certain time. In general, human sleep shifts to slow wave sleep, which is a deeper sleep when falling asleep, but when more time elapses, coarse movement occurs at a certain point in time, and the slow wave sleep ends. From this, the probability that the resting state is continued for a certain period of time on the right vertical axis in FIG. For example, if the resting state lasts for 15 minutes, it can be understood from the figure that the person falls asleep with a probability of about 85% and that the slow-wave sleep has ended with a probability of about 10%, and measures the duration of the resting state. As a result, falling asleep judgment can be performed at a level sufficient for practical use. That is, it was found that about 15 minutes was appropriate as the set time T.

When a luggage or the like is placed on the mattress 14, the piezoelectric element 4 is deformed to generate a voltage. However, a lifeless object such as a luggage does not have a minute movement accompanying the heartbeat or respiration of the human body. Therefore, no malfunction occurs.

With the above operation, body motion is detected without contact with the human body by the piezoelectric element, and falling asleep is determined from simple variables such as the duration of the resting state. Therefore, brain waves, eye movements, and pulse waves are detected as in the conventional case. There is an effect that the falling asleep can be easily detected in a non-contact manner without attaching the detecting means to the human body.

In the above embodiment, the piezoelectric element 4 is connected to the mattress 1
5, but may be built in the mattress 15 or provided on the bed frame as long as the above-mentioned slender body movement can be detected.
It is good also as a structure which can be built in or arranged in a pillow or the like.

A second embodiment of the present invention will be described below.
This embodiment is different from the above-described embodiment in that a display means 17 for displaying the signal level of the integrator 9 as shown in FIG.
And a setting unit 18 capable of manually setting the first set value and the second set value based on the content displayed on the display unit 17.

With the above configuration, the user himself / herself can use the display means 1.
7 based on the signal level of the integrator 9 displayed on the
And the second set value can be manually set.
Therefore, even if there is an individual difference in the size of the fine body movement, the user can select a set value suitable for the user, and there is an effect that the thin body movement can be reliably detected to detect falling asleep.

A third embodiment of the present invention will be described below.
This embodiment is different from the above-described embodiment in that, as shown in FIG. 7, a storage unit 19 that samples and stores the signal level of the integrator 9 at a predetermined cycle and a storage unit 19 that stores the signal level. It is characterized in that it has a calculating means 20 for calculating the minimum value and the maximum value of the stored contents, and a setting means 21 for setting the minimum value to the first set value and the maximum value to the second set value.

With the above configuration, the storage means 19 stores the integrator 9
Is stored, the minimum value and the maximum value of the stored contents are calculated, and the minimum value and the maximum value are set as the first set value and the second set value, respectively. From the above, even if there is an individual difference in the size of the fine movement, the magnitude of the fine movement is sequentially stored and the set value for detecting the fine movement is learned, so that the fine movement is reliably detected. There is an effect that falling asleep can be detected.

A fourth embodiment of the present invention will be described below.
This embodiment is different from the above-described embodiment in that a setting unit 22 capable of manually changing the set time T is provided as shown in FIG. Thus, even if there is an individual difference in the duration of the resting state, there is an effect that the user can surely detect falling asleep by selecting the set time T suitable for himself.

A fifth embodiment of the present invention will be described below.
This embodiment differs from the above-described embodiment in that, as shown in FIG. 9, the timer 13 is clocked by the timer 13 each time the timer operation of the timer 13 is reset by a signal from the absence determination unit 10 or the body movement determination unit 12. A storage means 23 for storing the time count; a first calculation means 24 for calculating the frequency distribution of the time count stored in the storage means 23; and the cumulative frequency up to a certain time T in the frequency distribution and the total cumulative frequency. A second calculating means 25 for calculating and calculating a time T so that the ratio becomes a predetermined value;
Setting means 26 for performing an arithmetic operation to set the time T as the set time.

With the above configuration, each time the time counting operation of the timer 13 is reset by the signal of the absence determination means 10 or the body movement determination means 12, the time measured by the timer 13 is stored. Then, the frequency distribution of the stored clocking time is calculated, and in the calculated frequency distribution, the time T is calculated such that the ratio of the cumulative frequency up to a certain time T to the total cumulative frequency becomes a predetermined value, The time T is set as the set time T. As a result, even if there are individual differences in the duration of the resting state, the duration of the resting state is sequentially stored and the set time for detecting the falling asleep is learned, so that the falling asleep can be detected reliably. There is.

In the above embodiment, the piezoelectric element is provided on the bedding. However, falling asleep may be detected by a configuration in which the piezoelectric element is provided on furniture such as a sofa or a study chair. In addition, falling asleep may be detected by a configuration in which a piezoelectric element is provided on a toilet seat or a bathtub.

The embodiments of the present invention have been described above.
The field of application of the present invention is as a control signal for an air conditioner, a lighting device, an audiovisual device, etc. for realizing a comfortable sleeping environment, and a measuring device for a sleep experiment in a clinical field such as treatment of insomnia. It is widely applied and highly practical, for example, as a monitoring device for sleep management and bed management in hospitals and home care.

[0034]

As described above, according to the sleep detecting device of the present invention, the following effects can be obtained.

Since the body motion is detected by the piezoelectric element without contacting the human body and sleep onset is determined from simple variables such as the duration of the resting state, the detection means for detecting brain waves, eye movements, and pulse waves as in the prior art is provided. There is an effect that falling asleep can be easily detected in a non-contact manner without being worn on a human body.

Further, even if there is an individual difference in the size of the fine body movement, the user can select a set value suitable for the user, so that there is an effect that the fine body movement can be reliably detected and the falling asleep can be detected. is there.

Further, even if there is an individual difference in the size of the fine body movement, the size of the fine body movement is sequentially stored and the set value for detecting the fine body movement is learned, so that the fine body movement can be detected reliably. Sleep can be detected.

Further, even if there is an individual difference in the continuation time of the resting state, the user can select a set time suitable for himself, so that there is an effect that falling asleep can be reliably detected.

Further, even if there is an individual difference in the duration of the resting state, the duration of the resting state is sequentially stored and the set time for detecting the falling asleep is learned, so that the falling asleep can be detected reliably. There is.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a sleep detection device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a sleep determination device according to the first embodiment of the present invention.

3A is a waveform diagram showing an output from a piezoelectric element according to the first embodiment of the present invention. FIG. 3B is an enlarged waveform diagram of FIG.

FIG. 4 is a waveform chart showing an output from the integrator according to the first embodiment of the present invention.

FIG. 5 is a characteristic diagram showing a relationship between the duration of a resting state and the probability of falling asleep.

FIG. 6 is an external perspective view of a sleep detection device according to a second embodiment of the present invention.

FIG. 7 is a block diagram of a sleep detection device according to a third embodiment of the present invention.

FIG. 8 is an external perspective view of a sleep detection device according to a fourth embodiment of the present invention.

FIG. 9 is a block diagram of a sleep detection device according to a fifth embodiment of the present invention.

FIG. 10 is a block diagram of a conventional sleep detection device.

[Explanation of symbols]

 Reference Signs List 4 piezoelectric element 5 circuit unit 6 filter 7 amplifier 8 rectifier 9 integrator 10 absence determination means 11 presence determination means 12 body movement determination means 13 timer 14 sleep determination means

Claims (5)

(57) [Claims] A piezoelectric element disposed on the bedding, a filter for filtering a specific frequency component of a signal of the piezoelectric element, an amplifier for amplifying a signal of the filter, and rectifying a signal of the amplifier. a rectifier, a signal of the rectifier Tokoro
An integrator that integrates per unit time , an absence determination unit that determines that a human body does not exist on the bedding when a signal level of the integrator is less than a predetermined first set value, When the signal level is equal to or greater than the first set value and less than a second predetermined value, the on-bed determination means for determining that the human body is present in a resting state on the bedding; and The signal level is the second
If it is equal to or more than the set value, the body movement determining means for determining that the human body has caused a body movement on the bedding, and a time counting operation is started by a signal from the presence determining means and the absence determination means or the body movement Sleep detection comprising a timer for resetting the timekeeping operation in response to a signal from the determination means, and sleep determination means for determining that the human body has fallen asleep on the bedding if the time measured by the timer exceeds a predetermined set time. apparatus. 2. A display means for displaying a signal level of the integrator, and the first set value and the second set value can be manually set based on contents displayed on the display means. The sleep detection device according to claim 1, further comprising a setting unit. 3. A storage means for sampling and storing the signal level of the integrator at a predetermined cycle, a calculation means for calculating a minimum value and a maximum value of the stored contents stored in the storage means, and The sleep detecting means according to claim 1, further comprising setting means for setting a value as the first set value and setting the maximum value as the second set value. 4. The sleep detecting means according to claim 1, further comprising a setting means capable of manually changing the set time. 5. A storage means for storing a time measured by the timer each time the timekeeping operation of the timer is reset by a signal from the absence determination means or the body movement determination means, and stored in the storage means. First calculating means for calculating the frequency distribution of the measured time, and calculating the time T so that the ratio between the cumulative frequency up to a certain time T and the total cumulative frequency in the frequency distribution becomes a predetermined value. 2. The sleep detecting device according to claim 1, further comprising: a second calculating means for obtaining the value; and a setting means for performing the above-mentioned storing and calculating operations at regular intervals to set a time T as the set time.