JP2016007446A - Biological signal detector and wake-up device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological signal detector capable of detecting a biological signal with high sensitivity, and a wake-up device comprising the same.SOLUTION: A biological signal detector includes a bendable plate member, and a piezoelectric element which is provided on one surface of the plate member, which is brought away from the center of bending and which is bent in such a manner as to interlock with the bending of the plate member. When the plate member is bent on the basis of vibrations transmitted to the plate member from a predetermined region of the human body, the piezoelectric element is bent in such a manner as to interlock with the plate member. Thus, the piezoelectric element outputs an electric signal corresponding to the vibrations.

Description

  The present invention relates to a biological signal detection device that is installed in a sleeping device such as a bed and detects a biological signal from a predetermined part of a human body, and an alarm device including the biological signal detection device.

  Heart rate, respiration, and body movement are detected to prevent sudden accidents while the elderly or sick are sleeping, to create a comfortable healing environment, and to improve the efficiency of nursing in an aging society in the future. It is extremely useful. Conventionally, heartbeats are generally detected by installing multiple electrodes on the body, and breathing is generally performed by inserting a tube into the nostril, but the detection monitor is expensive, Moreover, since it is necessary to secure an installation place, detection is limited only to a serious patient. Therefore, a general patient or an elderly person at home may die without being able to notify the nurse or nurse of a sudden change due to a heart disease or cerebral infarction.

  Therefore, in recent years, a biological information detection device has been devised that can detect body movement, heartbeat, and respiration by simply putting it on a bed or a futon and sleeping an elderly person wearing clothes. The biological information detection device detects a biological signal of a human body, performs a required frequency filtering process on the electrical signal obtained by the detection, extracts a heartbeat signal or a respiratory signal, and the amplitude of the electrical signal is When a predetermined threshold value is exceeded, it is possible to determine that it is a body movement.

  For example, as a detection method of the biological information detection device, there are a method for detecting the mat internal pressure (see Patent Document 1), a method for detecting a change in capacitance (see Patent Document 2), and the like.

  As a method of detecting using a piezoelectric element, when a subject touches and lies on a cable base sheet in which a plurality of piezo cables are arranged at equal intervals, the vibration pressure of heartbeat motion is mechanically applied to the piezoelectric elements of the piezo cable. There has been disclosed a device that detects a heartbeat by detecting a voltage that is transmitted as a signal and proportional to the mechanical signal is generated in the piezoelectric element, and the voltage generated in the piezoelectric element is detected (see Patent Document 3).

JP 2000-107154 A JP-A-10-14889 JP 2005-160650 A

  The piezoelectric element generates a voltage corresponding to the applied pressure. More specifically, for example, when a force is applied in the direction in which the piezoelectric element shrinks, a positive charge is generated between the electrodes of the piezoelectric element, and when a force is applied in the direction in which the piezoelectric element extends, a negative charge is generated. Occurs. For this reason, for example, in a device such as Patent Document 3, when a subject touches and lies on a cable base sheet, the piezoelectric element of the piezo cable has a contracting force and an expanding direction. Since force is applied at the same time, there is a problem that the positive charge and the negative charge generated between the electrodes of the piezoelectric element cancel each other, and the sensitivity for detecting a biological signal is lowered.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a biological signal detection device capable of detecting a biological signal with high sensitivity, and an alarm device including the biological signal detection device.

  A biological signal detection apparatus according to the present invention includes a bendable plate member, and a piezoelectric element that is provided on one surface of the plate member and is spaced apart from the bending center and bends in conjunction with the bending of the plate member. A biological signal is detected on the basis of vibration transmitted from the predetermined portion to the plate member.

  The biological signal detection apparatus according to the present invention is characterized in that the plate member is provided with a thin plate portion having a thin plate thickness, and the thin plate portion can be bent around the thin plate portion.

  The biological signal detection apparatus according to the present invention includes a hinge, and the plate member includes a first plate member and a second plate member each having one side fixed to the hinge, and the hinge shaft of the hinge is The bending center is bendable.

  The biological signal detection apparatus according to the present invention is characterized in that the bending center is provided on the opposite side of the one surface of the plate member.

  An alarm device according to the present invention is an alarm device including the biological signal detection device according to the above-described invention, and includes an awakening portion that vibrates based on a biological signal detected by the biological signal detection device, and the vibration of the awakening portion. The frequency is made equal to one of a plurality of natural frequencies of the alarm device.

  According to the present invention, a biological signal can be detected with high sensitivity.

It is explanatory drawing which shows an example of the principal part of the structure of the biosignal detection apparatus of 1st Embodiment. It is a top view which shows the 1st Example of the biosignal detection apparatus of 1st Embodiment. It is sectional drawing which shows the longitudinal cross section seen from the III-III line | wire of FIG. It is a schematic diagram which shows an example of the detection of the biosignal by the biosignal detection apparatus of 1st Embodiment. It is explanatory drawing which shows an example of the biosignal when the separation distance of a bending center and a piezoelectric element is short. It is explanatory drawing which shows an example of the biosignal in case the separation distance of a bending center and a piezoelectric element is long. It is a top view which shows the 2nd Example of the biosignal detection apparatus of 1st Embodiment. It is sectional drawing which shows the longitudinal cross section seen from the IIX-IIX line | wire of FIG. It is a top view which shows the 3rd Example of the biosignal detection apparatus of 1st Embodiment. It is sectional drawing which shows the longitudinal cross section seen from the XX line of FIG. It is a top view which shows the 4th Example of the biosignal detection apparatus of 1st Embodiment. It is a top view which shows the 5th Example of the biosignal detection apparatus of 1st Embodiment. It is explanatory drawing which shows the 6th Example of the biosignal detection apparatus of 1st Embodiment. It is explanatory drawing which shows the 6th Example of the biosignal detection apparatus of 1st Embodiment. It is a schematic diagram which shows an example which looked at the installation state of the alarm device of 1st Embodiment from the side. It is a schematic diagram which shows an example which looked at the installation state of the alarm device of 1st Embodiment from the upper surface. It is explanatory drawing which shows an example of the principal part of the structure of the alarm device of 1st Embodiment. It is a block diagram which shows an example of a structure of the alarm device of 1st Embodiment. It is a schematic diagram which shows the 1st example of the modal analysis using a plate-shaped model. It is a schematic diagram which shows the 1st example of the modal analysis using a plate-shaped model. It is a schematic diagram which shows the 2nd example of the modal analysis using a plate-shaped model. It is a schematic diagram which shows the 2nd example of the modal analysis using a plate-shaped model. It is a schematic diagram which shows the 3rd example of the modal analysis using a plate-shaped model. It is a schematic diagram which shows the 3rd example of the modal analysis using a plate-shaped model. It is a schematic diagram which shows the 4th example of the modal analysis using a plate-shaped model. It is explanatory drawing which shows the relationship between the vibration frequency of a motor, and the signal amplitude of a piezoelectric element. It is a block diagram which shows an example of a structure of the alarm device of 2nd Embodiment. It is a flowchart which shows an example of the process sequence of the alarm device of 2nd Embodiment. It is a flowchart which shows an example of the process sequence of the alarm device of 2nd Embodiment.

(First embodiment)
Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments. FIG. 1 is an explanatory diagram illustrating an example of a main part of the structure of the biological signal detection device 50 according to the first embodiment. The biological signal detection device 50 is made of, for example, a plastic plate member 20 having flexibility, a piezoelectric element 21 disposed in the center of the plate member 20, and an electric signal generated by the piezoelectric element 21 as described below. A lead wire 22 (both positive and negative lead wires) for delivery to the substrate 62 is included. The biological signal detection device 50 constitutes the alarm device 100 together with the main body 60. The alarm device 100 will be described later. The piezoelectric element 21 is attached to the plate member 20 integrally with a tape or the like.

  FIG. 2 is a plan view showing a first example of the biological signal detection apparatus 50 according to the first embodiment, and FIG. 3 is a cross-sectional view showing a longitudinal section viewed from the line III-III in FIG. As shown in FIGS. 2 and 3, the biological signal detection device 50 includes a plate member 201 (first plate member), a plate member 202 (second plate member), the piezoelectric element 21, the elastic mat 40, a hinge 30, and the like. Is provided.

  The hinge 30 includes a cylindrical hinge body 31, attachment portions 32, 33, and the like, and the hinge body 31 has a hinge shaft 30a as a bending center. The attachment portions 32 and 33 are bent with the hinge shaft 30a as a bending center. One side of the plate member 201 is fixed to one attachment portion 32 of the hinge 30, and one side of the plate member 202 is fixed to the other attachment portion 33 of the hinge 30. That is, the plate member 201 and the plate member 202 are mechanically connected to each other by the hinge 30.

  The hinge 30 is made of metal such as aluminum, for example. The thickness of the hinge shaft 30a can be about 5 mm, for example, and the dimensions of the mounting portions 32 and 33 can be 15 mm × 15 mm, for example.

  A horizontally long piezoelectric element 21 is fixed in a substantially straight line with a double-sided tape so as to be orthogonal to the hinge shaft 30a below the surface to which the two plate members 201, 202 and the hinge 30 are connected. An elastic mat 40 is disposed below the plate members 201 and 202 with the piezoelectric element 21 interposed therebetween.

  For example, a piezoelectric cable Vibetek10 manufactured by Ormal Electronics can be used as the piezoelectric element 21, but the piezoelectric element 21 is not limited to this.

  The plate members 201 and 202 are made of, for example, ABS resin, and the dimensions can be, for example, 9 cm × 10 cm square and the thickness can be 1 to 10 mm. The elastic mat 40 is made of, for example, urethane, and can have a size of, for example, 20 cm × 10 cm square and a thickness of 10 mm to 30 mm.

  As shown in FIG. 3, the biological signal detection device 50 is separated from the plate members 201 and 202 that can be bent around the hinge shaft 30a serving as the bending center, and the center of the hinge shaft 30a (also referred to as a bending center line). The piezoelectric element 21 is provided on one surface of the plate members 201 and 202 and bent in conjunction with the bending of the plate members 201 and 202. That is, the piezoelectric element 21 is provided on one surface of the plate members 201 and 202 and bends in conjunction with the bending of the plate members 201 and 202. The piezoelectric element 21 is separated from the center of the hinge shaft 30a when the plate members 201 and 202 are bent (in FIG. 3, it is separated by a distance indicated by reference sign d).

  In the following description, it is assumed that the bending center, the hinge shaft 30a, and the bending center line are the same, and the plate member 201 of the biological signal detection device 50 when the biological signal detection device 50 is installed on a horizontal base. , 202 is a straight line that passes through the center in the thickness direction of the component or member that is bent, and is parallel to the top and bottom surfaces of the plate members 201, 202. For example, the axial direction of the hinge shaft 30a of the hinge 30 corresponds to the bending center line.

  Although not shown for simplicity, the lead wire 22 connected to the piezoelectric element 21 is connected to an amplifier in the main body case 61. The voltage signal amplified by the amplifier is converted into a digital signal through an AD converter and a filtering circuit, and transmitted to an external information processing device such as a tablet terminal, a smartphone, or a PC by wireless or wired communication. It is converted into biological information such as a body motion signal, a respiratory signal, and a heartbeat signal by signal processing. In addition, the biological information can be fed back to the user through the display of the information processing apparatus.

  The biological signal detection device 50 is inserted, for example, on the user's mattress side. If it arrange | positions so that a user may be touched directly, a user may feel a foreign body feeling and may disturb sleep, Usually, it arrange | positions via a futon. For this reason, although it is desirable to arrange | position through 3 cm-10 cm thick mattresses, depending on the user, there is no mattress and there is a case where a sheet is laid on the mattress and sleeps on the mattress. The biological signal detection device 50 may be arranged. In addition, the surface on which the biological signal detection device 50 is laid is preferably an elastic surface such as a mattress, but may be disposed on the bottom plate or flooring, tatami floor, or the like of an inelastic bed.

  When the biological signal detection device 50 is used for the purpose of detecting respiration or heartbeat, a part such as the diaphragm or the heart serves as a main vibration source, and thus the biological signal detection device 50 is disposed immediately below these parts. It is desirable to do so. In addition, if it is a location which can detect a biological signal comparatively stably, such as under the pillow, it can arrange | position in arbitrary locations.

  Next, a method for detecting a biological signal by the biological signal detection device 50 will be described. FIG. 4 is a schematic diagram illustrating an example of detection of a biological signal by the biological signal detection device 50 according to the first embodiment. 4 shows a state in which the plate members 201 and 202 are bent around the hinge shaft 30a of the hinge 30, the bent state is schematically illustrated with a little exaggeration for easy understanding. It does not faithfully show the actual bent state.

  When the user's body motion (vibration) is transmitted to the biological signal detection device 50, the plate members 201 and 202 are displaced in the thickness direction of the plate members 201 and 202 around the hinge shaft 30 a (bending center line) of the hinge 30. (Bend). Usually, tensile stress and compressive stress are applied to the piezoelectric element 21. A charge signal is generated between both electrodes of the piezoelectric element 21 by the piezoelectric effect.

  However, as shown in FIGS. 3 and 4, since the piezoelectric element 21 is separated from the center of the hinge shaft 30a when the plate members 201 and 202 are bent, the vicinity of the surface of the piezoelectric element 21 on the plate member side. As shown by the symbol A, a relatively small tensile stress is applied. On the other hand, since the distance from the center of the hinge shaft 30a is large in the vicinity of the surface of the piezoelectric element 21 opposite to the plate member, a relatively large tensile stress is applied as indicated by reference numeral B. That is, since both surfaces of the piezoelectric element 21 are separated from the center of the hinge shaft 30a, it can be seen that only the tensile stress is generated.

  On the other hand, in the conventional configuration, since the bending center exists inside the piezoelectric element, when the piezoelectric element is bent, the piezoelectric element expands on one surface side and contracts on the other surface side. For this reason, a positive charge and a negative charge are simultaneously generated between the electrodes of the piezoelectric element and cancel each other, and an electric signal taken out from the piezoelectric element is weakened.

  In the present embodiment, only the tensile stress or the compressive stress is applied to the piezoelectric element 21. For this reason, when the piezoelectric element 21 expands or contracts based on the vibration transmitted from the predetermined part of the human body to the plate members 201 and 202, the amount of charge that is offset can be reduced. That is, it contributes to the improvement in sensitivity and the S / N ratio when detecting a biological signal.

  FIG. 5 is an explanatory diagram showing an example of a biological signal when the separation distance between the bending center and the piezoelectric element is short, and FIG. 6 is an explanation showing an example of a biological signal when the separation distance between the bending center and the piezoelectric element is long. FIG. The bending center is the hinge shaft 30a (bending center line) of the hinge 30.

  5 and 6, the horizontal axis represents time (seconds), and the vertical axis represents the voltage (V) of the biological signal. It can be seen that the voltage of the biological signal is larger when the distance between the bending center and the piezoelectric element shown in FIG. 6 is longer than when the distance between the bending center and the piezoelectric element shown in FIG. 5 is short. .

  As described above, the plate members 201 and 202 each having one side fixed to the hinge 30 are provided, and the plate members 201 and 202 can be bent with the hinge shaft 30a of the hinge 30 as a bending center. That is, the plate members 201 and 202 can be bent with respect to each other about the hinge shaft 30a. Thereby, when the piezoelectric element 21 expands and contracts based on the vibration transmitted from the predetermined part of the human body to the plate members 201 and 202, the amount of charge that is canceled can be reduced, so that the biological signal is detected with high sensitivity. Can do.

  In addition to the effect obtained by separating the hinge shaft 30a (bending center line) of the hinge 30 and the piezoelectric element, at the corners on the hinge 30 side of the plate members 201 and 202 and at the two contact points of the piezoelectric element 21 Since bending occurs in the piezoelectric element 21 and a piezoelectric effect due to vertical stress is further obtained, it contributes to an improvement in sensitivity and an S / N ratio when detecting a biological signal.

  In the present embodiment, as long as the piezoelectric element 21 is disposed across the hinge shaft 30a and the hinge shaft 30a and the piezoelectric element 21 are slightly separated from each other, regardless of the size, material, and quantity of the member. The sensitivity at the time of detecting a biological signal can be improved.

  The piezoelectric element 21 may be an artificial ceramic using lead zirconate titanate or the like, or may be a polymer using polyvinylidene fluoride or the like. Any suitable piezoelectric device can be used as long as it has a piezoelectric effect and can efficiently detect body motion vibration. The piezoelectric element 21 may be in the form of a cable or a film.

  Further, the arrangement of the piezoelectric elements 21 is not limited to the examples of FIGS. For example, it may be arranged in the vicinity of the periphery of the plate member, or a plurality of them may be arranged. Further, the piezoelectric element 21 may be arranged in a curved shape in addition to the linear shape. In addition, the piezoelectric element 21 is provided on the surface opposite to the surface where the plate members 201 and 202 face the human body, but may be formed integrally so as to detect the vibration of the plate members 201 and 202. . That is, the plate members 201 and 202 may be arranged on the surface facing the human body, or may be arranged so as to be embedded in the plate members 201 and 202. 2 and 3, the configuration includes one hinge 30, but a configuration including a plurality of hinges 30 may also be used. Moreover, the magnitude | size or material of the piezoelectric element 21 and the board members 201 and 202 can be set suitably.

  FIG. 7 is a plan view showing a second example of the biological signal detection apparatus 50 according to the first embodiment, and FIG. 8 is a cross-sectional view showing a longitudinal section taken along line IIX-IIX in FIG. In the second embodiment, as compared with the first embodiment, the plate member 20 is made of one material, and the thickness of the plate member 20 is thin at the bent center (bent center line).

  That is, as shown in FIGS. 7 and 8, the plate member 20 is provided with a thin plate portion 25 having a thin plate thickness, and can be bent with a center 25 a of the thin plate portion 25 as a bending center. The thickness of the thin plate portion 25 is thinner than the thickness of the piezoelectric element 20 (indicated by reference sign S). As described above, since the thin plate portion 25 provided on one plate member can be the center of bending, an additional member for bending the plate member is not necessary, and the manufacturing cost can be reduced.

  Even when the single plate member 20 is bent as in the second embodiment, if the bending center line and the piezoelectric element 21 are slightly separated, the charge generated between the electrodes of the piezoelectric element 21 is reduced. Can be reduced.

  In the example of FIG. 7, the piezoelectric element 21 is disposed at the approximate center of the plate member 20. However, the arrangement of the piezoelectric element 21 is not limited to the example of FIG. 7. It may be arranged near the periphery, or a plurality of piezoelectric elements 21 may be arranged. Further, although the piezoelectric elements 21 are arranged in a straight line, they may be arranged in a curved line according to the shape of the plate member 20 and the like. Moreover, the magnitude | size or material of the piezoelectric element 21 and the plate member 20 can be set suitably.

  FIG. 9 is a plan view showing a third example of the biological signal detection apparatus 50 according to the first embodiment, and FIG. 10 is a cross-sectional view showing a vertical cross section viewed from line XX of FIG. As shown in FIG. 10, in the third embodiment, compared to the first embodiment, the piezoelectric element 21 and the hinge 30 are arranged with the plate members 201 and 202 interposed therebetween.

  That is, the piezoelectric element 21 is disposed on one surface side of the plate members 201 and 202, and a bending center (hinge shaft 30a) is provided on the surface of the plate members 201 and 202 opposite to the one surface. As a result, the separation distance between the piezoelectric element 21 and the bending center can be further increased (longened). Therefore, when the plate members 201 and 202 are bent, a force in the extending direction is applied to most of the piezoelectric element 21. In other words, the amount of charge that is canceled out can be further reduced, so that a biological signal can be detected with higher sensitivity, contributing to improved sensitivity and improved S / N ratio.

  In the example of FIG. 9, the piezoelectric element 21 is arranged in the approximate center of the plate members 201 and 202, that is, near the hinge 30, but the arrangement of the piezoelectric element 21 is limited to the example of FIG. 9. Instead, for example, it may be arranged near the periphery of the plate members 201 and 202, or a plurality of piezoelectric elements 21 may be arranged. Further, although the piezoelectric elements 21 are arranged in a straight line, they may be arranged in a curved line according to the shape of the plate members 201 and 202. Moreover, the magnitude | size or material of the piezoelectric element 21 and the board members 201 and 202 can be set suitably.

  FIG. 11 is a plan view showing a fourth example of the biological signal detection apparatus 50 according to the first embodiment. In the fourth embodiment, an example in which a piezoelectric cable 21 a is employed as an example of the piezoelectric element 21 is shown. As shown in FIG. 11, in the fourth embodiment, three plate members 201, 202, 203 and two hinges 30 are provided, and the plate member 201 and the plate member 202 are centered on one hinge shaft 30a. The plate member 202 and the plate member 203 are bent around the other hinge shaft 30a. And the piezoelectric cable 21a is provided along the edge of the plate member 201, 202, 203 which arranged three.

  When compared with the same installation area, the piezoelectric cable 21a can be manufactured at a lower cost than a form using other piezoelectric elements. By employing the configuration of the fourth embodiment, the manufacturing cost of the biological signal detection device 50 can be reduced.

  Further, if the biological signal detection device 50 can be manufactured at a low cost, the biological signal detection device 50 can be provided in a wide range, and vibration due to body movement can be detected in a wide range. Thereby, even if the user moves on the bedding at bedtime, the biological signal can be detected more reliably.

  In the example of FIG. 11, the piezoelectric cable 21a is provided around the edges of the plate members 201, 202, and 203. However, the arrangement of the piezoelectric cable 21a is not limited to the example of FIG. The plate members 201, 202, and 203 may be disposed at the center, or a plurality of piezoelectric cables 21a may be disposed. Moreover, although the piezoelectric cable 21a is arrange | positioned at substantially U shape, you may arrange | position with another shape according to the shape etc. of the plate members 201, 202, and 203. FIG. Further, although one hinge 30 is provided between the opposing plate members, a plurality of hinges 30 may be provided depending on the shape or size of the plate member. The size or material of the piezoelectric cable 21a and the plate members 201, 202, and 203 can be set as appropriate.

  FIG. 12 is a plan view showing a fifth example of the biological signal detection apparatus 50 according to the first embodiment. In the fifth embodiment, an example in which a piezoelectric film 21 b is employed as an example of the piezoelectric element 21 is shown. As shown in FIG. 12, in the fifth embodiment, as in the fourth embodiment, three plate members 201, 202, 203 and two hinges 30 are provided, and the plate member 201 and the plate member 202 are The plate member 202 and the plate member 203 are bent around the other hinge shaft 30a. And the piezoelectric film 21b is provided in the vicinity of the hinge 30 so that the longitudinal direction of the strip-shaped piezoelectric film 21b becomes a direction orthogonal to the axial direction of the hinge shaft 30a.

  Since the piezoelectric film 21b generally has a laminated structure such as a bimorph as a sensor structure, when compared with the same installation area, the sensitivity to pressure is higher than that using other piezoelectric elements, but the manufacturing cost is higher accordingly. There is a feature. Further, since the piezoelectric film 21b can have sensitivity directivity in a certain direction, the sensitivity in the direction in which the piezoelectric film 21b is pulled when the plate members 201, 202, and 203 are bent at the bending center line. By setting, an electric signal can be efficiently extracted.

  According to the fifth embodiment, the highly sensitive piezoelectric film 21b can be locally disposed, and the manufacturing cost of the biological signal detection device 100 can be reduced. In addition, since the piezoelectric film 21b can be reduced in thickness, the biological signal detection device 100 can be reduced in thickness, and the operational convenience that it is not bulky when folded can be improved. .

  In the example of FIG. 12, the piezoelectric film 21b is disposed in the vicinity of the hinge 30; however, the piezoelectric film 21b is not limited to the example of FIG. 12 as long as the piezoelectric film 21b is disposed across the hinge shaft 30a. Further, although one hinge 30 is provided between the opposing plate members, a plurality of hinges 30 may be provided depending on the shape or size of the plate member. The size or material of the piezoelectric film 21b and the plate members 201, 202, and 203 can be set as appropriate.

  FIG.13 and FIG.14 is explanatory drawing which shows the 6th Example of the biosignal detection apparatus 50 of 1st Embodiment. The sixth embodiment shows a method of fixing the piezoelectric element 21 and the piezoelectric cable 21a to a plate member. As shown in FIG. 13, a plurality of cylindrical pockets 41 are separated from each other by an appropriate length on the surface of the plate member 20, 201, 202, 203 along the location where the piezoelectric element 21 or the piezoelectric cable 21 a is disposed. Install. By fitting the piezoelectric element 21 (or the piezoelectric cable 21a) inside the plurality of pockets 41, the piezoelectric element 21 can be arranged at a required position, and the workability when attaching the piezoelectric element 21 is improved. Cost can also be reduced.

  Further, as shown in FIG. 14, a claw 42 is attached on the surface of the plate member 20, 201, 202, 203 on the place where the piezoelectric element 21 or the piezoelectric film 21b is arranged. By fitting the piezoelectric element 21 (or the piezoelectric film 21b) into the claw 42, the piezoelectric element 21 can be arranged at a required position, workability when attaching the piezoelectric element 21 is improved, and manufacturing cost is also reduced. be able to.

  FIG. 15 is a schematic diagram illustrating an example of an installation state of the alarm device 100 according to the first embodiment as viewed from the side, and FIG. 16 is a schematic diagram illustrating an example of the alarm device 100 according to the first embodiment as viewed from above. FIG. FIG.15 and FIG.16 shows an example of the bedding which a user (person) sleeps. In FIG. 15, reference numeral 1 denotes a mattress. A mattress 2 is laid on the upper side of the mattress 1. Reference numeral 3 denotes a pillow. The user is lying on his / her back with his head placed on the pillow 3. In FIGS. 15 and 16, comforters, sheets, and the like are not shown in order to avoid complications. In FIG. 16, the user is not shown for convenience.

  As shown in FIG. 15, alarm device 100 of the present embodiment is used by being arranged between pillow 3 and mattress 2. The reason why the alarm device 100 is disposed between the pillow 3 and the mattress 2 is preferably located closer to the user's head. However, if the alarm device 100 is in direct contact with the head, the sleeping comfort may be impaired. This is to burden the user. Note that the arrangement of the alarm device 100 is not limited to the examples of FIGS. 15 and 16, and can be appropriately changed as long as it is arranged below the head. For example, the alarm device 100 may be inserted into the pillow 3, may be disposed between the mattress 2 and the mattress 1, or may be disposed within the mattress 1. Moreover, the structure of bedding is not limited to the example of FIG.15 and FIG.16, and the mattress 2 or the mattress 1 is not an essential structure.

  As shown in FIG. 15, the alarm device 100 of the present embodiment has a relatively thin thickness, and the shape thereof is smaller than the shape of the pillow 3 as shown in FIG. 16. As shown in FIG. 16, the alarm device 100 includes a biological signal detection device 50, a main body 60, and the like.

  A cloth such as a towel may be used instead of the pillow 3. In particular, in the case of an infant, in order to eliminate the burden on the neck, a cloth is often used instead of the pillow 3. Even in such a case, the alarm device 100 of the present embodiment can be applied.

  FIG. 17 is an explanatory diagram illustrating an example of a main part of the structure of the alarm device 100 according to the first embodiment. The alarm device 100 includes a main body 60, a biological signal detection device 50, and the like.

  In the main body case 61, a circuit board 62, a motor 63, and a vibration member 64 for transmitting vibration due to rotation of the motor 63 to the main body case 61 are arranged. Note that the vibration member 64 is not an essential component in the case where the vibration caused by the rotation of the motor 63 can be directly transmitted to the main body case 61.

  The piezoelectric element 21 is disposed at the center of the plate member 20 of the biological signal detection device 50 and is electrically connected to the circuit board 62 in the main body case 61 by the lead wire 22. The piezoelectric element 21 is attached to the plate member 20 integrally with a tape or the like. A power cord 65 for supplying power to the circuit board 62 extends to the outside of the main body case 61.

  The circuit board 62 and the motor 63 are electrically connected, and the motor 63 is formed integrally with the main body case 61 so that the vibration is transmitted to the main body case 61. As the motor 63, for example, a vibration source or the like employed for a vibration function of a mobile phone or a smartphone can be used. In FIG. 17, the circuit board 62, the motor 63, and the like are housed in the main body case 61, but FIG. 17 shows a state where the main body case is opened for convenience.

  FIG. 18 is a block diagram illustrating an example of the configuration of the alarm device 100 according to the first embodiment. FIG. 18 illustrates the configuration of the alarm device 100 according to the first embodiment from the functional aspect. As illustrated in FIG. 18, the alarm device 100 includes a control unit 10 that controls the entire apparatus, a biological signal detection unit 11, a signal processing unit 12, a wake-up unit 13, and the like.

  The biological signal detection unit 11 detects a biological signal including body movement through the human head. Body movement includes movement of a part of the human body (head, neck, arm, shoulder, waist, hand, etc.) regardless of whether or not the person is sleeping. The biological signal includes, for example, signals such as heartbeat and respiration in addition to body movement. For detection of the biological signal, a biological signal detection sensor such as the piezoelectric element 21 can be used. Instead of the piezoelectric element 21, a biological signal detection sensor such as a capacitance sensor, an acceleration sensor, a displacement detection sensor using electromagnetic waves, a gyro sensor, or a microphone may be used.

  In the example of FIG. 17, the biological signal detection unit 11 corresponds to the biological signal detection device 50 including the piezoelectric element 21 and the plate member 20. That is, the biological signal detection unit 11 includes a plate member 20 having flexibility and a piezoelectric element 21 as a biological signal detection sensor provided on the plate member 20.

  The signal processing unit 12 corresponds to the circuit board 62 in the example of FIG. The signal processing unit 12 can be configured by, for example, a microcomputer, an AD converter, an amplifier circuit, and the like disposed on the circuit board 62. A filter can also be provided.

  The signal processing unit 12 determines the presence or absence of a body motion signal from the biological signal detected by the biological signal detection unit 11. For example, when the magnitude of the biological signal (for example, the amplitude of the signal) is larger than a predetermined threshold, it is determined that there is a body movement signal, and the magnitude of the biological signal is smaller than the predetermined threshold. It can be determined that there is no body motion signal.

  In addition, the sleep depth can be calculated from the frequency of occurrence of body movement. For example, the less the frequency of body movement, the deeper the sleep depth.

  Further, the signal processing unit 12 extracts at least a heartbeat signal or a respiratory signal from the biological signal detected by the biological signal detection unit 11. For example, the heartbeat signal can be extracted by extracting a signal of 0.7 to 5 Hz from the biological signal. The respiratory signal can be extracted by extracting a 0.2 to 0.7 Hz signal from the biological signal.

  Moreover, you may make it take out a snoring sound by taking out the signal of 70-500 Hz from the biological signal detected by the biological signal detection part 11, and notify (for example, display) to a user as a sleep parameter | index. Further, by obtaining the Fourier spectrum of the heartbeat interval and acquiring the power in the vicinity of 0.3 Hz, the amount of parasympathetic nerve activity can be obtained and notified to the user. It can be seen that the higher the power, the more active the parasympathetic nerve activity.

  The awakening unit 13 operates based on the biological signal detected by the biological signal detection unit 11. For example, the awakening unit 13 can use the motor 63, but in addition to the motor 63, an actuator, a speaker, a bell, a buzzer, or the like can be used. In particular, in the alarm device 100 of the first embodiment, since it is installed below the head, the means for vibrating the alarm device 100 itself (the body case 61 and / or the plate member 20) by the motor 63 is the most. It is valid.

  That is, the awakening unit 13 includes a vibration source and a flexible plate member that transmits the vibration of the vibration source. For example, a motor 63 can be used as the vibration source. The vibration generated by the motor 63 can be diffused (transmitted) throughout the plate member 20. For example, by arranging the plate member 20 so as to face the head, the vibration of the entire plate member 20 is transmitted to the head and the person can be awakened.

  The awakening unit 13 awakens the user by vibration, and the vibration frequency thereof is set to be equal to one of a plurality of natural frequencies of the alarm device 100 as a whole. “Equivalent” means, for example, that the vibration frequency of the awakening portion 13 is within a range of about ± 10% of one natural frequency. As a result, even if the awakening unit 13 (vibration source) generates a relatively small amplitude, the vibration of the awakening unit 13 is emphasized by resonance in the entire apparatus, so that a vibration source that generates a large amplitude is not necessary and saved. Electric power can be reduced and the apparatus can be downsized.

  When the control unit 10 can extract a signal such as heartbeat or respiration and can determine that there is no body motion signal, the control unit 10 can determine that the person is not awake. Is activated. Since the biological signal is detected through the head of the human body, the size of the device can be reduced to the size of the head, and the size of the device can be made compact.

  Next, the operation of the alarm device 100 according to the first embodiment will be described. The alarm device 100 continuously detects a biological signal by the biological signal detection unit 11 while the user sleeps. The depth of sleep is continuously detected based on the detected biological signal (body motion). When the sleep depth reaches the REM sleep stage within the preset wake-up time range, the awakening unit 13 is operated to urge the user to wake up.

  The sleep cycle of a person is about 90 minutes, and the breakdown is about 70 minutes for the non-REM sleep stage, which is deep sleep, and about 20 minutes for the REM sleep stage, which is shallow sleep. By prompting the user to wake up during the REM sleep stage, the person can wake up comfortably. Considering the possibility that the REM sleep stage will come within the wake-up time range, it is desirable that the wake-up time range is set to 70 minutes or more, but even if it is less than 70 minutes, the sleep depth is the shallowest within the wake-up time range By awakening, it is possible to provide the user with a relatively comfortable awakening.

  Next, a method for calculating the sleep depth will be described. The subject is set in advance with alarm device 100 of the present embodiment, and at the same time, the subject is allowed to sleep while wearing an electroencephalograph. Then, body motion data and brain wave data by the alarm device 100 of the present embodiment are detected simultaneously. Next, from the measured data, a correlation formula between the frequency of body movement and the sleep depth calculated from the electroencephalogram data is obtained. Specifically, in body motion data, a machine learning tool based on a neural network is used to detect the frequency of occurrence of a signal that exceeds a predetermined threshold from the level when there is no signal, and to increase the correlation between this frequency and sleep depth. Is used to find the threshold value.

  In alarm device 100 of the present embodiment, it is used by being installed below the head, for example, under pillow 3 or a fabric. Conventionally, the vibration sensor is arranged under the bedding, but the shape of the alarm device 100 of the present embodiment is about the size of the pillow 3, so that the size of the device can be made compact.

  Further, when the user turns over, etc., the user can fully recognize that the biological signal cannot be detected if the head is displaced from the pillow 3, so the user can sleep on the pillow 3 or the fabric. If this is the case, it is possible to give the user a sense of security that it can be reliably detected.

  Moreover, since the alarm device 100 of this Embodiment does not ask | require the shape and design of the pillow 3, it can be used using the pillow 3 and cloth which a user likes, and the burden by installation of the alarm device 100 with respect to a user is carried out. It can be eliminated.

  Further, based on the biological signal detected by the biological signal detection unit 11, it is possible to detect a pulse generated from the blood flow flowing through the head, and it is possible to contribute to improvement of the determination accuracy of the user's presence / absence of bed.

  In addition, when the vibration sensor is installed for the entire bedding as in the prior art, the object to transmit vibration is the entire body, whereas in the present embodiment, the vibration source necessary for the awakening unit 13 is the head. Because it is placed close to it, only the head is the target for transmitting vibration. For this reason, since the weight of the vibration target is lighter than in the past, it is possible to generate the vibration necessary for awakening with less power. In addition to transmitting vibrations to the head, the sound of the vibration source contributes to the awakening action, and the awakening effect is higher than when transmitting vibrations to the entire body. Become.

  When the user goes to sleep with the alarm device 100 placed under the pillow 3, the plate member 20 is deformed by body movement during sleep, and the piezoelectric element 21 detects the deformation, whereby the piezoelectric element 21 is deformed. An electric signal corresponding to the size is output to the circuit board 62. The signal processing unit 12 acquires the electrical signal output from the piezoelectric element 21 and performs predetermined signal processing. And when the conditions for starting an awakening operation | movement are satisfy | filled, the control part 10 operates the motor 63 as the awakening part 13. FIG. Thereby, main body case 61 itself can be vibrated. Further, since the main body case 61 and the plate member 20 are mechanically integrated, the entire plate member 20 also vibrates. Then, the vibrations of the main body case 61 and the plate member 20 are transmitted to the user's head, which promotes effective awakening.

  The alarm device 100 according to the present embodiment awakens the user by the vibration of the motor 63, and the vibration frequency substantially matches one of the natural frequencies of the entire device, so that a relatively small amplitude is generated. Even if it is a vibration source, the vibration is emphasized by resonance in the entire device. Therefore, since a vibration source that generates a large amplitude is unnecessary, a small motor or the like can be used, and power consumption can be reduced and the apparatus can be downsized. The approximate match can be said to be approximate match if, for example, the vibration frequency of the motor 63 is within a range of about ± 10% of one natural frequency.

  As described above, in the present embodiment, the frequency of the motor 63 is made to substantially match one of the natural frequencies of the alarm device 100 as a whole. The natural frequency of the entire alarm device 100 can be obtained, for example, by performing a modal analysis on the shape of the entire device. Hereinafter, the natural frequency will be described.

  19A and 19B are schematic diagrams illustrating a first example of modal analysis using a plate model, and FIGS. 20A and 20B are schematic diagrams illustrating a second example of modal analysis using a plate model. 21A and 21B are schematic views showing a third example of modal analysis using a plate model, and FIG. 22 is a schematic diagram showing a fourth example of modal analysis using a plate model.

19 to FIG. 22 are calculated by assuming that the plate-like model is the shape of the alarm device 100 for the sake of simplicity. 19, FIG. 20 and FIG. 22 are calculated for a plate shape having dimensions of 400 mm × 100 mm × 2 mm, and FIG. 21 is a calculation for a plate shape having dimensions of 600 mm × 300 mm × 2 mm. The material of the plate member is ABS resin, the density is 1.02e-006 kgmm ⁻³ , the Young's modulus is 2000 Mpa, the Poisson's ratio is 0.394, the bulk modulus is 3144.7 MPa, and the shear modulus is 717.36 MPa. In FIG. 19, FIG. 20, and FIG. 21, both ends of the plate member are fixed, and in FIG. 22, only one end of the plate member is fixed.

  FIG. 19 shows vibration modes in the length direction (longitudinal direction) of the plate member, FIG. 19A shows the basic mode, and FIG. 19B shows the primary mode. FIG. 20 shows vibration modes in the twist direction of the plate member, FIG. 20A shows the basic mode, and FIG. 20B shows the primary mode. Further, when the dimension in the width direction of the plate member becomes longer, a vibration mode in the width direction as shown in FIG. 21 is generated. FIG. 21A shows the basic mode, and FIG. 21B shows the hybrid vibration mode in the length direction and the width direction.

  Each vibration mode has a natural frequency, and when compared between vibration modes of the same type, the natural frequency becomes smaller as the mode is always closer to the fundamental mode. On the other hand, when comparing between different types of vibration modes, which natural frequency is lower depends on the shape and cannot be generally stated. The smaller the natural frequency, the more vibration can be generated by the motor with the smaller number of rotations, and the reduction in size and power can be achieved. Therefore, the vibration mode with the smallest natural frequency is selected to vibrate the motor 63. Is good.

  The natural frequency becomes small when only one end is fixed as shown in FIG. For example, in the plate member of 400 mm × 100 mm × 2 mm, the natural frequencies in the vibration modes in the length direction, the twist direction, and the width direction are 20.3 Hz, 26.3 Hz, and 379.2 Hz, respectively. The natural frequency of the vibration mode illustrated in Fig. 5 is smaller by one or two digits, such as 3.3 Hz.

  That is, when vibrating in the vibration mode in a state where both ends in the length direction of the device are not fixed, it can be vibrated at the smallest natural frequency, which is advantageous from the viewpoint of miniaturization of the device and power saving. . One way to achieve this is to load the human part if the plate shape, which is the device shape, has a length that is at least twice as long as the area where the load on the human part is applied. This makes the center of the plate shape quasi-fixed, and both ends of the plate shape become free ends, can generate vibration modes as illustrated in FIG. 22, and can vibrate the entire device with a small natural frequency. It becomes.

  In order to obtain the vibration frequency of the motor 63, the following method can be used. For example, before operating the alarm device 100, the alarm device 100 is installed in a state close to the actual use environment. Then, the vibration frequency of the motor 63 is scanned in a predetermined scanning frequency section (for example, about 0.5 Hz to 100 Hz is preferable, and more preferably 1 Hz to 10 Hz is preferable), and the vibration amount of the alarm device 100 is detected by a piezoelectric element. The minimum frequency is stored among one or a plurality of frequencies (corresponding to natural frequencies) at which the amplitude (signal amplitude) of the electric signal output from the piezoelectric element has a maximum value. When operating the alarm device 100, the motor 63 is operated at the stored minimum frequency.

  FIG. 23 is an explanatory diagram showing the relationship between the vibration frequency of the motor 63 and the signal amplitude of the piezoelectric element. In FIG. 23, the frequency at which the signal amplitude of the piezoelectric element shows the maximum value is the natural frequency. Therefore, the natural vibration mode can be generated more accurately by operating the motor 63 at the minimum natural frequency among the natural frequencies. Thereby, it is possible to prevent a reduction in vibration efficiency of the device due to a slight shift in the natural frequency depending on the situation where the alarm device 100 is installed.

  As described above, in the present embodiment, the vibration frequency of the wake-up unit 13 approximately matches the natural frequency of the wake-up device 100, so that even a motor with a small rating can obtain the vibration necessary for waking up. In addition, when the wake-up device 100 is installed in the bedding (for example, under the pillow), the natural frequency may change. However, the vibration frequency of the motor changes for each predetermined scanning frequency section in the state of being installed in the bedding. Then, the signal amplitude of the piezoelectric element is measured using the biological signal detection device 50, and the vibration frequency at which the signal amplitude shows the maximum value is used as the vibration frequency at the time of waking up. Thereby, the vibration required for waking up can be obtained with a small motor, and the wake-up device 100 can be reduced in size and power can be saved.

  In the present embodiment, the piezoelectric element 21 is used to detect a biological signal. Since the piezoelectric element 21 is thin and relatively inexpensive, and has a high sensitivity and can detect very minute vibrations, it is most suitable for detecting body movements during sleep.

  In the present embodiment, the plate member 20 has a role of detecting a user's body movement and collecting and transmitting the vibration to the piezoelectric element 21. Thereby, even when the piezoelectric element 21 is not in direct contact with the pillow 3, if at least a part of the plate member 20 is in contact with the pillow, vibration from the head is transmitted to the pillow 3 and further to the plate member 20. Can be further transmitted to the piezoelectric element 20.

  In the present embodiment, the plate member 20 further has a role of diffusing vibration generated by the motor 63 throughout the pillow 3. Thereby, even when the head is not positioned in the vicinity of the motor 63, the vibration of the motor 63 can be transmitted to the head via the pillow 3.

  In the present embodiment, the plate member 20 has a first function of collecting vibrations caused by human body movements and transmitting the vibrations to the piezoelectric element 21 and a second function of diffusing the vibrations of the motor 63 throughout the pillow 3. With functions. Although the plate member that performs the first function and the plate member that performs the second function can be provided separately, by providing both functions to one plate member 20, the size of the apparatus can be reduced and the size of the apparatus can be reduced. This is advantageous because the cost can be reduced.

  The thickness of the plate member 20 can be set to, for example, about 0.2 to 5 mm, and more preferably about 0.5 to 2 mm. The size of the plate member 20 is preferably about 1 to 20 cm in the height direction of the user, and is preferably about 5 to 100 cm in the direction perpendicular to the height direction. In addition, the material of the plate member 20 may be flexible, and for example, ABS resin or the like can be used in consideration of strength.

  Moreover, the main-body part 60 of the alarm device 100 can be arrange | positioned under the pillow 3 or the cloth. As a result, the overall size of the alarm device 100 can be reduced. Further, the main body case 61 is required to be designed to be as thin as possible so as not to be a burden on the user, and is desirably 2 cm or less, and more desirably 1 cm or less.

  In the above-described embodiment, as another configuration of the signal processing unit 12, for example, a filter can be provided in the previous stage of the AD converter. The filter can extract an electrical signal including only specific biological information from the detected biological signal. As the filter, a low-pass filter, a high-pass filter, a band-pass filter, a band elimination filter, or a combination thereof can be used.

  As another configuration of the signal processing unit 12, an interface circuit may be provided instead of the microcomputer. The detected biological signal may be sent to an external device via an interface circuit, and signal processing may be performed in the external device. The interface circuit may be, for example, a communication means to a wired external device such as USB, RS232C, IEEE 1394 or the like, or may be a communication means to a wireless external device such as Bluetooth (registered trademark), wireless LAN, or WiFi. The external device may be, for example, a personal computer, a mobile device, a mobile phone, a tablet terminal, a smartphone, an Internet line router connected to a server, or the like.

  As described above, according to the alarm device 100 of the present embodiment, since the biological signal is detected and the awakening operation is performed using only the pillow 3 or the fabric area, the device size can be reduced. Further, since the user's head is used, it is easy to detect the heartbeat from the pulse of the head. Further, since the user's head is used, it becomes close to a part such as the mouth or nose, and it becomes easy to detect respiration. In addition, since the vibration source necessary for awakening can be arranged near the head, it is possible to generate the vibration necessary for awakening with less power consumption than in the case where the vibration source is arranged in the bedding.

(Second Embodiment)
FIG. 24 is a block diagram illustrating an example of the configuration of the alarm device 120 according to the second embodiment. The difference from the alarm device 100 of the first embodiment illustrated in FIG. 18 is that the interface unit 14 and the schedule storage unit 15 are provided. The same parts as those of the alarm device 100 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The alarm device 120 of the second embodiment predicts the user's wake-up time using the biological signal detected by the biological signal detection device 50 and controls the operation of the external home appliance.

  The interface unit 14 is for exchanging information with an external device, for example, a home appliance. The interface unit 14 has a function of transmitting a control signal for controlling home appliances in particular. The interface unit 14 may be, for example, a wired communication interface such as USB, RS232C, or IEEE1394, or a wireless communication interface such as Bluetooth (registered trademark), wireless LAN, or WiFi.

  The schedule storage unit 15 stores predetermined schedule data. The schedule data includes, for example, the number of sleep cycles associated with each weekday, holiday, and event day. For example, the number of sleep cycles on weekdays is 4, the number of sleep cycles on holidays is 5, and the number of sleep cycles on event days can be 3, 4, 5, etc. for each event. The sleep cycle is synonymous with the sleep cycle, and the sleep cycle of a person is about 90 minutes (a total of about 70 minutes of non-REM sleep + about 20 minutes of REM sleep). Therefore, a sleep cycle number of 5 means that the sleep time is 7 hours 30 minutes (5 × 90 minutes).

  25 and 26 are flowcharts illustrating an example of a processing procedure of the alarm device 120 according to the second embodiment. In the following, for the sake of simplicity, the subject of processing will be described as the control unit 10. The control unit 10 detects a biological signal (S11) and calculates the sleep depth (S12). The control unit 10 determines whether or not one cycle of the sleep cycle has passed (S13), and when one cycle has not passed (NO in S13), repeats the processing after step S11. By the processing from step S11 to S13, the sleep time for one period of the sleep cycle unique to the user can be obtained.

  When one cycle of the sleep cycle has elapsed (YES in S13), the control unit 10 refers to the schedule storage unit 15 and determines the sleep cycle (the number of sleep cycles) according to the day to wake up (S14). Specifically, it is determined whether the day to wake up is a weekday, a holiday, or an event day, and a sleep cycle corresponding to the determined day is determined. For example, since the time is limited on weekdays, the number of cycles is set to 4, and the number of cycles is set to 5 because there is plenty of time on holidays, and the number of cycles is specially determined according to the situation on days with events To do.

  The control unit 10 calculates the wake-up time using the determined number of sleep cycles (S15), and calculates the operation start time of the target device (for example, the target home appliance) (S16). For example, assuming that the number of sleep cycles is 4 and the sleep time for one cycle of the user-specific sleep cycle is 90 minutes, the wake-up time can be obtained by adding 360 minutes (4 × 90 minutes) to the bedtime. In addition, the time required from the start of operation of the home appliance to the completion of the predetermined operation is calculated retroactively from the wake-up time. For example, when it takes 60 minutes from the start of operation of the rice cooker to completion of cooking, the time starting 60 minutes from the wake-up time is set as the operation start time.

  The control unit 10 detects a biological signal (S17) and calculates the sleep depth (S18). The control unit 10 determines whether or not it is the operation start time of the target device (S19), and when it is the operation start time (YES in S19), transmits the operation start signal of the target device to the target device (S20). ), The process of step S21 described later is performed.

  If it is not the operation start time of the target device (NO in S19), the control unit 10 determines whether or not the current time has reached sleep cycle time × integer multiple (S21), and if it has not reached (S21) NO), the processing after step S17 is repeated.

  When the current time has reached sleep cycle time × integer multiple (YES in S21), the control unit 10 determines whether the current time has reached the determined sleep cycle (sleep cycle number) (S22). If not reached (NO in S22), the sleep cycle time per cycle is corrected to the average value of the sleep cycle time so far, and the wake-up time is reset using the set sleep cycle time. Calculation and correction are made (S23), and the processing after step S17 is repeated.

  If the current time has reached the determined sleep cycle (the number of sleep cycles) (YES in S22), the control unit 10 starts an awakening operation (S24) and ends the process.

  In step S16, when calculating the operation start time of the target device, the time required from the start of operation to the completion of the predetermined operation is used, but this time can be stored in advance for each home appliance. That's fine. Or before performing the process of step S11, you may make it receive from a target apparatus the information required in order to calculate the time required from a driving | operation start until a predetermined operation | movement is completed, or the said time. The reason why it is configured to receive necessary information from the target device is that the time required for the predetermined operation may vary depending on the state of each home appliance, for example, the time required for rice cooking differs depending on the amount of rice cooked. Therefore, by acquiring such information from the target device and calculating the operation start time of the target device, it is possible to perform control more accurately according to the wake-up time.

  The schedule data stored in the schedule storage unit 15 may be input directly to the wake-up device 120 by using the input device such as a button, a touch panel, or a keyboard provided in the wake-up device 120. As another method, for example, schedule data stored in a portable information terminal or a personal computer may be transferred to the wake-up device 120 via a wired or wireless connection. Further, schedule data uploaded to the server via the network may be downloaded.

  In addition, when determining the sleep cycle (the number of sleep cycles) in step S14, for example, if the sleep time seems to be insufficient due to a delay in the bedtime on weekdays, the weekend holiday is more than usual. The number of sleep cycles may be automatically increased. The sleep time excess / deficiency determination is, for example, the sleep cycle time (90 minutes) × the number of weekday cycles × the number of weekdays (for example, five days from Monday to Friday) as the ideal total sleep time, This can be done based on whether the difference from the sum exceeds the threshold time. This determination may be performed in units that include holidays, for example, in units of one week.

  The wake-up device 120 according to the present embodiment predicts the user's wake-up time and controls the operation of the target device. Therefore, when the user wakes up, the product of the target device (for example, rice cooker (Cooking) can be used in an ideal state. Moreover, since it can utilize in an ideal state, the work by readjustment of a product reduces and the amount of energy consumption can also be reduced. In addition, once each home appliance is set so that it can receive control from the target device, it is not necessary to set a timer reservation every day according to the user's convenience, and automatically sets the target device. The operating time can be reserved.

  The control signal transmitted from the interface unit 14 to the target device may be received directly by the target device. However, the control signal is received by another control device, and the control device transmits the control signal to the target device. It may be. For example, the control signal may be transmitted to a home gateway found in Echonet. Moreover, you may make it transmit a control signal to the cleaning robot etc. which have a cooperation function with object apparatus.

  As described above, according to the wake-up device 120, the operation of the target device can be controlled by predicting the wake-up time, and the state of the target device is in a desired state when the user wakes up. Improved convenience.

  The technical features described in the above embodiments of the present invention can be combined with each other to form a new technical plan.

  The biological signal detection apparatus according to the present embodiment is provided with a bendable plate member (20, 201, 202, 203), and is provided on one surface of the plate member so as to be separated from the bending center and interlocked with the bending of the plate member. And a piezoelectric element (21, 21a, 21b) that bends and detects a biological signal based on vibrations transmitted from a predetermined part of the human body to the plate member.

  The biological signal detection device includes a bendable plate member, and a piezoelectric element that is provided on one surface of the plate member and is spaced apart from the center of bending and bends in conjunction with the bending of the plate member. That is, the piezoelectric element is provided on one surface of the plate member and bends in conjunction with the bending of the plate member. Since the piezoelectric element is separated from the bending center when the plate member is bent, when the piezoelectric element is bent, the force applied to the piezoelectric element in the extending direction is larger than the force applied in the reducing direction. For example, the amount of charge that cancels out the positive charge and the negative charge between the electrodes of the piezoelectric element is reduced. When the piezoelectric element expands and contracts based on vibration transmitted from a predetermined part of the human body to the plate member, it is possible to reduce the amount of charge that is canceled out, so that a biological signal can be detected with high sensitivity.

  In the biological signal detection apparatus according to the present embodiment, the plate member is provided with a thin plate portion (25) having a thin plate thickness, and the thin plate portion can be bent around the thin plate portion.

  The plate member is provided with a thin plate portion having a thin plate thickness, and is capable of bending with the thin plate portion as a bending center. For example, since the thin plate part provided in one plate member can be made into a bending center, the additional member for bending a plate member becomes unnecessary and manufacturing cost can be reduced.

  The biological signal detection apparatus according to the present embodiment includes a hinge (30), and the plate member includes a first plate member (201) and a second plate member (202) each having one side fixed to the hinge. And the hinge shaft (30a) of the hinge is bendable about the bending center.

  The biological signal detection device includes a hinge. The plate member has a first plate member and a second plate member, each of which is fixed to a hinge, and can be bent with the hinge axis of the hinge as a bending center. In other words, the first plate member and the second plate member can be bent with respect to each other about the hinge axis. Thereby, when the piezoelectric element expands and contracts based on vibration transmitted from the predetermined part of the human body to the first plate member and the second plate member, it is possible to reduce the amount of charge that is canceled out, thereby increasing the biological signal. It can be detected with sensitivity.

  The biological signal detection apparatus according to the present embodiment is characterized in that the bending center is provided on the opposite side of the one surface of the plate member.

  A bending center is provided on the opposite side of one surface of the plate member. As a result, the separation distance between the piezoelectric element and the bending center can be further increased (longened), so that when the plate member is bent, a force in the extending direction is applied to the majority of the piezoelectric element, which cancels out. Since the amount of charge to be generated can be further reduced, the biological signal can be detected with higher sensitivity.

  The alarm device according to the present embodiment is an alarm device including the biological signal detection device according to the above-described invention, and includes an awakening unit (13, 63) that vibrates based on the biological signal detected by the biological signal detection device. The vibration frequency of the wake-up part is made equal to one of a plurality of natural frequencies of the wake-up device.

  A wake-up unit that vibrates based on a bio-signal detected by the bio-signal detection device is provided, and the vibration frequency of the wake-up unit is made equal to one of a plurality of natural frequencies of the wake-up device. “Equivalent” means, for example, that the vibration frequency of the awakening part is within a range of about ± 10% of one natural frequency. As a result, even if the awakening part (vibration source) generates a relatively small amplitude, the vibration of the awakening part is emphasized by resonance in the entire apparatus. Reduction and downsizing of the apparatus can be achieved.

DESCRIPTION OF SYMBOLS 10 Control part 11 Biosignal detection part 12 Signal processing part 13 Awakening part 14 Interface part 15 Schedule memory | storage part 20,201,202,203 Plate member 21 Piezoelectric element 21a Piezoelectric cable 21b Piezoelectric film 22 Lead wire 25 Thin plate part 30 Hinge 30a Hinge Axis 40 Elastic mat 50 Biological signal detection device 60 Body portion 61 Body case 62 Circuit board 63 Motor 64 Vibration member 65 Power cord

Claims (5)

A bendable plate member;
A piezoelectric element that is provided on one surface of the plate member and is spaced apart from the bending center and bends in conjunction with the bending of the plate member;
A biological signal detection apparatus, wherein a biological signal is detected based on vibration transmitted from a predetermined part of a human body to the plate member. The plate member is
A thin plate part with a reduced thickness is provided,
The biological signal detection device according to claim 1, wherein the thin plate portion is bendable with the bend center as a bend center. With a hinge,
The plate member is
A first plate member and a second plate member each having one side fixed to the hinge;
2. The biological signal detection device according to claim 1, wherein the hinge shaft of the hinge is bendable with the bend center as the bend center.   The biological signal detection apparatus according to claim 3, wherein the bending center is provided on the opposite side of the one surface of the plate member. An alarm device comprising the biological signal detection device according to any one of claims 1 to 4,
A wake-up part that vibrates based on a biological signal detected by the biological signal detection device;
A wake-up device, wherein the vibration frequency of the wake-up part is made equal to one of a plurality of natural frequencies of the wake-up device.