Seat

Abstract

To inhibit measuring accuracy from being deteriorated by the vibration generated in a moving body when sensing ballistocardiology of a seated person and measuring a heart rate by a piezoelectric sensor provided in a seat of the moving body.SOLUTION: A seat (1) provided in a moving body includes: a piezoelectric sensor (15) having a first surface positioned on a body side of a seated person and a second surface opposed to the first surface for sensing ballistocardiology of the seated person through the first surface; and a support member (22) disposed inside a recessed part formed on at least one of a seating surface or a back surface of the seat (1) for supporting the piezoelectric sensor (15) from the second surface. At least a part between the surface of the support member (22) and the inner wall of the recessed part is formed with a gap so that the surface and the inner wall do not come in contact with each other.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a seat provided in a moving body. [Background technology]

[0002] A seat that is provided with a sensor that acquires body potential and can measure the heart rate of a seated person is known as a conventional technology. Patent Document 1 discloses a vehicle seat that can stably measure the heart rate of a seated person even if there is a difference in height between the seated person and the seated person. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-220322 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned conventional techniques have a problem in that vibrations, mainly caused when a moving body such as a vehicle moves, affect ballistocardiogram sensing, reducing the accuracy of measuring the heart rate.

[0005] One aspect of the present disclosure has been made in consideration of the above-mentioned problems, and aims to suppress a decrease in measurement accuracy due to vibrations generated in a moving body when a piezoelectric sensor installed in the seat of a moving body is used to sense the ballistocardial movement of a seated occupant and measure their heart rate. [Means for solving the problem]

[0006] In order to solve the above problems, the seat of aspect 1 of the present disclosure is a seat provided on a moving body, having a first surface located on the body side of a seated occupant and a second surface opposite the first surface, and comprising a piezoelectric sensor that senses the ballistocardial movement of the seated occupant through the first surface, and a support member that is disposed inside a recess formed in at least one of the seat surface or back surface of the seat and supports the piezoelectric sensor from the second surface, and at least a gap is provided between the surface of the support member and the inner wall of the recess to prevent the surface and the inner wall from coming into contact with each other.

[0007] According to the above configuration, the gap blocks vibrations from the seat or back to the support member, which makes it possible to suppress a decrease in measurement accuracy due to vibrations generated in the moving body when measuring the heart rate by sensing the ballistocardiogram of the seated person using a sensor provided on the seat of the moving body.

[0008] The seat according to aspect 2 of the present disclosure is, in the above-mentioned aspect 1, a vibration-damping material is provided in at least a portion of the gap to support the support member and suppress the transmission of vibrations from the seat surface or back surface to the support member.

[0009] According to the above configuration, the support member is fixed to the recess of the seat by the vibration-proof material, and vibrations transmitted from the seat to the support member can be suppressed.

[0010] A seat according to a third aspect of the present disclosure is the seat of the second aspect above, wherein the vibration-damping material is an air spring, and the air spring supports the support member on a surface opposite to the surface in contact with the seat surface or back surface.

[0011] According to the above configuration, the support member is fixed to the recess of the seat by the air spring, and vibrations transmitted from the seat to the support member can be suppressed mainly in a specific vibration frequency band.

[0012] The seat according to aspect 4 of the present disclosure is the same as aspect 2 above, in which the vibration-damping material is a package containing powder and granular material, and the package supports the support member on a surface opposite to the surface that contacts the seat surface or back surface.

[0013] According to the above configuration, the support member is fixed in the recess of the seat by the powder and granular material, and vibrations transmitted from the seat to the support member can be suppressed mainly in a specific vibration frequency band.

[0014] The seat sheet of aspect 5 of the present disclosure is any of aspects 2 to 4 above, in which at least one of the contact surfaces between the vibration-damping material and the support member, and the contact surface between the vibration-damping material and the recess in the seat surface or backrest, is multiple.

[0015] According to the above-mentioned configuration, vibrations transmitted from the seat or back surface to the support member are dispersed, which further prevents a decrease in the accuracy of measuring the heart rate.

[0016] A seat according to aspect 6 of the present disclosure is any of aspects 1 to 5 above, wherein the seat comprises a plurality of the piezoelectric sensors and a plurality of the support members corresponding to each of the plurality of the piezoelectric sensors, and the plurality of support members are disposed within a single recess and each support a corresponding one of the piezoelectric sensors.

[0017] According to the above configuration, the number of recesses in the seat is reduced, which contributes to simplifying the structure of the seat.

[0018] A seat according to a seventh aspect of the present disclosure is similar to the seat of the first aspect above, in that the support member is placed on a net stretched across opposing positions on the inner walls of the recess and is supported by the net.

[0019] According to the above-mentioned configuration, it is possible to further reduce vibrations transmitted to the support member from the vertically downward direction of the support member on the seat surface or the backrest.

[0020] The seat according to an eighth aspect of the present disclosure is any one of the first to seventh aspects, wherein the first surface of the piezoelectric sensor forms a substantially flat surface with the surface of the seat or the back surface.

[0021] According to the above configuration, it is possible to reduce the discomfort felt by the seat occupant when seated.

[0022] The seat according to aspect 9 of the present disclosure is any of aspects 1 to 8 above, wherein the seat surface or back surface has a first surface located on the side of the occupant's body and a second surface opposite the first surface, and a recess in which the support member is arranged is formed in the first surface of the seat surface or back surface, and a recess is formed in at least a part of the area in the second surface of the seat surface or back surface opposite the recess in which the support member is arranged.

[0023] According to the above configuration, it is possible to further reduce vibrations transmitted to the support member, particularly in a case where the support member is disposed on the seat surface.

[0024] The seat of aspect 10 of the present disclosure is any of aspects 1 to 9 above, in which the controller provided in the moving body performs at least one of the following processes: outputting a signal to notify information regarding the status of the occupant when the sensing result by the piezoelectric sensor satisfies a predetermined condition related to the ballistocardial movement of the occupant; and processing related to the movement of the moving body.

[0025] According to the above configuration, for example, when the sensing result indicates that the driver of the mobile object is feeling drowsy, it is possible to perform control to output a warning by audio output. Effect of the Invention

[0026] According to one aspect of the present disclosure, when a piezoelectric sensor provided on the seat of a moving body is used to sense the ballistocardial activity of a seated occupant and measure their heart rate, it is possible to prevent a decrease in measurement accuracy due to vibrations generated in the moving body. [Brief description of the drawings]

[0027] [Figure 1] FIG. 2 is a perspective view showing an example of the appearance of a seat provided in a moving body. [Diagram 2] FIG. 2 is a conceptual diagram showing an example of a seat surface of a seat. [Diagram 3] 5A and 5B are diagrams illustrating an example of an electrical signal waveform indicating a sensing result of a piezoelectric sensor. [Figure 4] FIG. 4 is a diagram showing an example of a cross-sectional view of a seating surface in the vicinity of a piezoelectric sensor. [Diagram 5] FIG. 4 is a diagram showing an example of a cross-sectional view of a seating surface in the vicinity of a piezoelectric sensor. [Figure 6] FIG. 4 is a diagram showing an example of a cross-sectional view of a seating surface in the vicinity of a piezoelectric sensor. [Figure 7] 1 is a graph showing an example of the relationship between the vibration frequency of vibration transmitted to a vibration-proof material and the transmissibility of various vibration-proof materials. [Figure 8] FIG. 2 is a drawing showing an example of a seat surface of a seat. [Figure 9] FIG. 2 is a three-dimensional view showing an example of a seat surface of a seat. [Figure 10] 11 is a diagram illustrating an example of the relationship between the vibration frequency of vibration noise, the magnitude of vibration noise, and the RRI correct answer rate. FIG. [Figure 11] 1 is an example of a distribution diagram for explaining the RRI correct answer rate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] An embodiment of the present disclosure will be described in detail below. Fig. 1 is a perspective view showing an example of the appearance of a seat 1 provided in a moving body. The seat 1 has a seat cushion 11, a seat back 12, and a headrest 13. The seat cushion 11 constitutes the seat surface of the seat 1, and the seat back 12 and the headrest 13 constitute the back surface of the seat 1.

[0029] In the following description, the moving body is described as a vehicle, but is not limited thereto and may be a ship, an airplane, etc. Furthermore, the seat 1 is not limited to being provided in a driver's seat, but may be provided in a passenger seat.

[0030] Fig. 2 is a conceptual diagram showing an example of the seat surface of the seat 1. The seat 1 is provided with a piezoelectric sensor 15 and a vibration-proof material 16 on the seat surface. In Fig. 2 and subsequent figures, the signal line connected to the piezoelectric sensor 15 and transmitting the sensing result is omitted. In addition, a support member for supporting the piezoelectric sensor 15 will be described later with reference to Fig. 4 etc.

[0031] The piezoelectric sensor 15 is a sensor that utilizes the piezoelectric effect of a piezoelectric element that generates a voltage when pressure is applied. The piezoelectric sensor 15 receives pressure from the buttocks of a person seated on the seat surface and senses the ballistocardiology (BCG) of the person. A controller (not shown) provided in the moving body measures the heart rate of the person by referring to the sensing result supplied from the signal line.

[0032] The vibration-proofing material 16 is provided below the piezoelectric sensor 15, and reduces vibrations transmitted from the seat surface to the piezoelectric sensor 15 compared to a case in which the seat 1 does not include the vibration-proofing material 16. When the moving object moves, vibrations from the road surface are transmitted to the seat 1. Even if the moving object is not moving, vibrations from the engine of the moving object and vibrations due to wind may be transmitted to the seat 1. In the following description, the above-mentioned vibrations transmitted from the seat surface to the piezoelectric sensor 15 are also referred to as "vibration noise".

[0033] FIG. 3 is a diagram showing an example of an electrical signal waveform showing the sensing result of the piezoelectric sensor 15. Waveform diagram 18 in FIG. 3 is an electrical signal waveform showing ballistocardiogram at the buttocks of a seated person. Waveform diagram 19 in FIG. 3 is an electrical signal waveform showing vibration noise when it is assumed that the seat 1 does not have the configuration for reducing vibration noise of the present disclosure. In waveform diagrams 18 and 19, the horizontal axis indicates time, and the vertical axis indicates the magnitude of ballistocardiogram or vibration noise. In the configuration of an existing seat, a vibration that is a combination of the vibration shown in waveform diagram 18 and the vibration shown in waveform diagram 19 is transmitted to the piezoelectric sensor 15.

[0034] The vibration-damping material 16 reduces the vibration noise shown in waveform diagram 19 that becomes noise when the piezoelectric sensor 15 senses the ballistocardial movement shown in waveform diagram 18, and contributes to improving the accuracy with which the piezoelectric sensor 15 measures the heart rate.

[0035] Fig. 4 is a diagram showing an example of a cross-sectional view of the seat surface in the vicinity of the piezoelectric sensor 15. In Fig. 4, a pad 21 is a flexible cushion that covers the frame of the seat 1.

[0036] As shown in Fig. 4, the piezoelectric sensor 15 has a first surface 34 located on the body side of the seated occupant, and a second surface 35 facing the first surface 34. Sensing of the ballistocardial movement of the seated occupant is performed via the first surface 34 of the piezoelectric sensor 15. In the example of Fig. 4, the first surface 34 is the upper surface of the piezoelectric sensor 15, and the second surface 35 is the lower surface. Usually, the surface of the pad 21 and the first surface 34 of the piezoelectric sensor 15 are covered with leather or the like for the seat 1, but they do not have to be covered.

[0037] In addition, the support member 22 is disposed inside the recess 36 of the seat surface so that the first surface 34 of the piezoelectric sensor 15 forms a substantially flat surface with the seat surface. This can reduce the discomfort felt by the occupant when seated.

[0038] The support member 22 supports the piezoelectric sensor 15 from the second surface 35. The material of the support member 22 is not limited to a specific material, and may be the same as the material of the pad 21, for example. However, it is desirable that at least the upper surface of the support member 22 that contacts the piezoelectric sensor 15 has high rigidity. In addition, a plate-like member having high rigidity may be provided between the upper surface of the support member 22 and the piezoelectric sensor 15.

[0039] Furthermore, a gap 23 is provided between the surface of the support member 22 and the inner wall of the recess 36 in the seat surface to prevent the surface and the inner wall from contacting each other. In particular, in this respect, the seat 1 according to the present disclosure has a different configuration from existing seats in which the piezoelectric sensor 15 is simply arranged on a pad.

[0040] 4 from above so as to face the piezoelectric sensor 15, a groove is formed around the periphery of the piezoelectric sensor 15. Vibrations from the pad 21 to the support member 22 are blocked by the gap 23.

[0041] Further, in the gap 23 below the support member 22, there is provided a vibration-proof material 16 that supports the support member 22 and suppresses the transmission of vibration from the seat surface to the support member 22. Here, the area below the support member 22 where the vibration-proof material 16 is arranged is also defined as the gap 23, as it is neither the pad 21 nor the support member 22.

[0042] The vibration-proofing material 16 is not limited to a specific type, and may be composed of an air spring, a metal coil spring, anti-vibration rubber, a rubber pad, cotton, a gel-like material, or the like. Alternatively, the vibration-proofing material 16 may be a package containing a powder or granular material such as a large number of beads. Each grain of the powder or granular material minutely changes position due to vibration, dispersing the impact and suppressing the transmission of vibration.

[0043] 4, vibration-isolating material 16 such as an air spring supports support member 22 on its upper surface opposite its lower surface in contact with the seating surface. However, the package or the like may have a shape that forms a flat surface only when external pressure is applied.

[0044] In addition, the present disclosure also includes a configuration in which the vibration-proof material 16 is provided in the gap 23 other than below the support member 22, and a configuration in which the seat 1 does not have the vibration-proof material 16 and the lower part of the support member 22 is integrated with the pad 21.

[0045] Furthermore, it is not essential that the vibration-proof material 16 be in contact with the entire surface of the underside of the support member 22, and it may be configured to support the support member 22 by, for example, a plurality of contact surfaces. Furthermore, there may also be a plurality of contact surfaces between the vibration-proof material 16 and the depression 36 in the seating surface. By having at least one of the contact surfaces between the vibration-proof material 16 and the support member 22 and the contact surface between the vibration-proof material 16 and the depression 36 in the seating surface being multiple, vibration transmitted from the seating surface to the support member 22 is dispersed.

[0046] 5 and 6 are diagrams showing an example of a cross-sectional view of the seat surface around the piezoelectric sensor 15 in an embodiment different from that of FIG. 4. In FIG. 5, the support member 22 is placed on a net 25 stretched between opposing positions on the inner wall of a recess 36 of the seat surface, and is supported by the net 25. In other words, the support member 22 is fixed to the net 25 and suspended in the interior of the recess 36 of the seat surface. According to the configuration shown in FIG. 5, it is possible to further reduce vibrations transmitted to the support member 22 from the vertically downward direction of the support member 22 on the seat surface.

[0047] In the cross-sectional view of FIG. 6, the lower surface of the pad 21 also has a recess 37 formed in an area facing the recess 36 on the upper surface. The recess 37 on the lower surface of the pad 21 does not necessarily have to be formed in the entire area facing the recess 36 on the upper surface. That is, in the configuration shown in FIG. 6, when the surface of the seat facing the body of the seated person is defined as the first surface 38 and the surface facing the first surface 38 is defined as the second surface 39, the support member is disposed in the recess 36 of the first surface 38, and the recess 37 is formed on the second surface 39 in at least a part of the area facing the recess 36 of the first surface 38. According to the configuration shown in FIG. 6, it is possible to further reduce vibration transmitted from the second surface 39 side of the seat to the support member 22. In addition, the present disclosure also includes a configuration in which no recess 36 is formed on the first surface 38 of the seat, the piezoelectric sensor 15 is simply placed on the pad 21, and a recess 37 is formed in at least a portion of the area of ​​the second surface 39 opposite the area of ​​the first surface 38 where the pad 21 contacts the piezoelectric sensor 15.

[0048] FIG. 7 is a graph showing an example of the relationship between the vibration frequency of the vibration transmitted to the vibration-proofing material and the transmissibility of various vibration-proofing materials. In FIG. 7, the horizontal axis indicates the vibration frequency, and the vertical axis indicates the transmissibility. Here, the transmissibility means the ratio at which the vibration-proofing material transmits the vibration transmitted from one object to another object. When the transmissibility corresponding to the target vibration frequency is less than 1, the vibration of the vibration frequency is attenuated, and the vibration-proofing material produces a vibration-proofing effect. For example, when the vibration material is an air spring, the vibration is amplified if the vibration frequency is less than 2*√2, but is attenuated if the vibration frequency exceeds 2*√2.

[0049] In measuring heart rate, the measurement accuracy is greatly improved by reducing vibration noise, particularly at a vibration frequency of just under 10 Hz. This is because vibration noise, particularly at the vibration frequency, interferes with the vibration caused by ballistocardial motion, which is the subject of measurement. Therefore, among the vibration-proof materials exemplified in FIG. 7, it is preferable to use air springs or metal coil springs. Metal coil springs are the most capable of reducing vibrations at a vibration frequency of 40 Hz or more among the vibration-proof materials exemplified in FIG. 7. In addition, the vibration-proof material may be configured such that multiple types of vibration-proof materials are combined and used for one recess in the seating surface.

[0050] Fig. 8 is a drawing showing an example of the seat surface of the seat 1. In the example of Fig. 8, the seat 1 has a plurality of configurations including a plurality of piezoelectric sensors 15 and support members 22 (not shown) in an area surrounded by a groove that becomes a gap 23. That is, the seat 1 of Fig. 8 has a plurality of configurations in which a plurality of support members 22 are arranged inside a single recess 36 and each support a corresponding piezoelectric sensor 15.

[0051] In the configuration illustrated in Fig. 8, the controller included in the moving body may measure the heart rate of the seated person by referring to the sensing results of the multiple piezoelectric sensors 15. For example, the controller may calculate the heart rate of the seated person by using an average value of the number of ballistocardial movements sensed by each of the multiple piezoelectric sensors 15. In addition, the shape of the depression 36 in the seating surface is not limited to a specific shape, and may be, for example, a rectangular shape or an elliptical shape when viewed facing the seating surface.

[0052] Three-dimensional diagrams 31 and 32 in Fig. 9 show an example of the seat surface of the seat 1. Three-dimensional diagram 31 shows a first surface 38 which is the upper surface of the seat surface, and corresponds to the drawing in Fig. 8. Three-dimensional diagram 32 shows a second surface 39 which is the lower surface of the seat surface, and corresponds to the cross-sectional view in Fig. 6.

[0053] It should be noted that the piezoelectric sensor 15 and the support member 22 are not limited to being provided on the seat surface of the seat 1, and may be provided on the back surface, or on both the seat surface and the back surface. From another perspective, in the description of the seat surface of the seat 1 according to the present disclosure, the "seat surface" may be read as the "back surface" or "seat surface or back surface".

[0054] In addition, in a configuration in which the piezoelectric sensor 15 is provided on the back surface of the seat 1, the vibration-damping material 16 may be provided on one or both of the vertically downward direction of the support member 22 and the surface direction opposite to the surface located on the body side of the seated occupant.

[0055] In addition, the seat 1 does not necessarily have to have both a seat surface and a back surface, and may have only one of them. In addition, like the seat 1, a bed or a mattress having the configuration shown in FIG. 4 is also included in the present disclosure.

[0056] FIG. 10 is a diagram showing an example of the relationship between the vibration frequency of vibration noise, the magnitude of vibration noise, and the RRI correct answer rate. The horizontal axis of FIG. 10 indicates the vibration frequency of vibration noise, and the vertical axis indicates the magnitude of vibration noise. FIG. 11 is an example of a distribution diagram for explaining the RRI correct answer rate. The horizontal axis of FIG. 11 indicates the ratio value of each RRI to the average value (average RRI) of ballistocardiogram RRI (RR Interval) in a predetermined period, and the vertical axis indicates the number of times each ratio value was reached. From another perspective, FIG. 11 shows the distribution of "rri / mean(rri)". Here, the denominator "mean(rri)" means the average value of RRI in a predetermined period, and the numerator "rri" means the value of each target RRI. The above-mentioned predetermined time is not limited to a specific time, and may be, for example, 5 minutes or 30 minutes.

[0057] When the value of the ratio is close to 1, the target RRI value is close to the average value and is therefore highly reliable, whereas when the value of the ratio is significantly different from 1, the reliability of the target RRI value is low. In measuring heart rate, it is possible to improve measurement accuracy by excluding or adjusting RRI values ​​with low reliability.

[0058] The RRI accuracy rate means the percentage of RRIs measured in a specified period that fall within a specified range. Usually, the specified range is defined as a certain range with the ratio value of 1 at the center. Also, frame 27 in FIG. 11 is an example of the specified range, and indicates a range in which the ratio value is 0.95 to 1.05.

[0059] For example, in FIG. 11, an RRI accuracy rate of 50% means that the ratio value corresponding to 50% of the RRIs measured in a given period falls within the range of frame 27.

[0060] In addition, when calculating the heart rate of a seated occupant, if the target RRI value is within the specified range, the controller may use the RRI value as is, and if the target RRI is outside the specified range, the controller may use the most recently measured RRI value.

[0061] In another embodiment, the ratio value used by the controller when calculating the RRI accuracy rate may be the ratio value of the currently measured RRI to the most recently measured RRI. In this configuration, a distribution diagram corresponding to FIG. 11 shows the distribution of "rri(k) / rri(k-1)". Here, the denominator "rri(k-1)" means the RRI value measured in the k-1th time, which is the most recent time after the kth time, and the numerator "rri(k)" means the RRI value measured in the kth time, which is the current time.

[0062] In addition, the controller may use the current RRI measurement value y(k) and the most recent estimated value x(k-1) as the RRI value to calculate the heart rate, and use a new estimated value x(k) calculated using the following formula: x(k)=w*y(k)+(1-w)*x(k-1) Here, w is a weighting coefficient according to the variance value in the distribution map, and can take a value of 0≦w≦1. The initial value x(0) on which the estimated value x is based may be calculated by the controller, for example, by cepstrum analysis. The controller may reset the initial value x(0) every time the main power supply of the mobile object is started, or may reset it at predetermined intervals.

[0063] 10, in any frequency band, the RRI accuracy rate increases by reducing the vibration noise transmitted to the piezoelectric sensor 15. That is, by reducing the potential of the piezoelectric sensor 15, which is input to the controller and corresponds to the vibration noise, it becomes easier to separate the ballistocardiogram electrical signal waveform, improving the accuracy of extracting the RRI feature amount and improving the accuracy of measuring the heart rate.

[0064] Furthermore, when the heart rate of the seated occupant calculated based on the sensing result by the piezoelectric sensor 15 indicates that an abnormality has occurred in the seated occupant, the controller performs a predetermined process such as a process of notifying the seated occupant of the abnormality. In a broader sense, the controller performs the predetermined process when the sensing result by the piezoelectric sensor 15 satisfies a predetermined condition related to the ballistocardiogram of the seated occupant. Here, the case where the sensing result by the piezoelectric sensor 15 satisfies the predetermined condition may be, for example, when the number of heart beats of the seated occupant in a predetermined time is equal to or lower than a lower limit or equal to or higher than an upper limit, or when it has changed by more than a reference value, etc.

[0065] Furthermore, as the predetermined process, the controller may perform the process exemplified below, which involves outputting a signal for notifying information regarding the state of a seated occupant. - Processing to output audio, video, light or text to notify the seated person that they are experiencing drowsiness, excitement or fatigue Processing to output a control signal and operate the seat or other movable parts of the vehicle in order to notify the seat occupant that he or she is experiencing drowsiness, excitement, fatigue, etc. - Processing to transmit information indicating that an abnormality has occurred to a seated person to a specified contact point via radio communication, etc. Furthermore, the controller may perform the following exemplary processes related to the movement of a moving object as the predetermined process. - Processing to stop a moving object on the shoulder of the road, etc. - Processing to reduce the speed of moving objects Processing to move a moving object to a designated location such as a hospital or home In addition, when a predetermined condition related to the ballistocardial activity of the seated occupant is satisfied, the controller may perform, as the predetermined processing, both the above-mentioned processing of outputting a signal to notify information regarding the condition of the seated occupant, and the above-mentioned processing related to the movement of the moving body.

[0066] [Software implementation example] The functions of the controller (hereinafter referred to as the "device") equipped on a moving body according to the present disclosure can be realized by a program for causing a computer to function as the device, and a program for causing a computer to function as each control block of the device.

[0067] In this case, the device includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., a memory) as hardware for executing the program. The control device and storage device execute the program to realize each function described in each of the above embodiments.

[0068] The program may be non-transitory and may be recorded in one or more computer-readable recording media. The recording media may or may not be included in the device. In the latter case, the program may be provided to the device via any wired or wireless transmission medium.

[0069] In addition, some or all of the functions of each of the control blocks can be realized by a logic circuit. For example, an integrated circuit in which a logic circuit that functions as each of the control blocks is formed is also included in the scope of the present disclosure. In addition, the functions of each of the control blocks can be realized by, for example, a quantum computer.

[0070] Furthermore, each process described in each of the above embodiments may be executed by AI (Artificial Intelligence). In this case, the AI ​​may be operated by the control device or may be operated by another device (for example, an edge computer or a cloud server).

[0071] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in the embodiments are also included in the technical scope of the present disclosure. [Explanation of symbols]

[0072] 1 seat 15 Piezoelectric Sensor 16 Vibration isolation material 22 Support member 23 void 25 Net 34 Piezoelectric sensor first side 35 Second surface of piezoelectric sensor 36, 37 Depression 38 First side of seat 39 Second side of seat

Claims

1. A seat provided in a moving body, a piezoelectric sensor having a first surface located on a body side of a seated occupant and a second surface facing the first surface, the piezoelectric sensor sensing ballistocardial movement of the seated occupant through the first surface; a support member disposed inside a recess formed in at least one of a seat surface or a back surface of the seat and supporting the piezoelectric sensor from the second surface, a gap is provided between at least a portion of the surface of the support member and the inner wall of the recess so that the surface and the inner wall do not come into contact with each other; a vibration-proofing material is provided in at least a portion of the gap to support the support member and to suppress transmission of vibration from the seat surface or the back surface to the support member; The vibration isolating material is an air spring, The air spring supports the support member on a surface opposite to a surface in contact with the seat surface or the back surface.

2. A seat provided on a moving body, comprising: a piezoelectric sensor having a first surface located on a body side of a seated occupant and a second surface facing the first surface, the piezoelectric sensor sensing ballistocardial movement of the seated occupant through the first surface; a support member disposed inside a recess formed in at least one of a seat surface or a back surface of the seat and supporting the piezoelectric sensor from the second surface, a gap is provided between at least a portion of the surface of the support member and the inner wall of the recess so that the surface and the inner wall do not come into contact with each other; a vibration-proofing material is provided in at least a portion of the gap to support the support member and to suppress transmission of vibration from the seat surface or the back surface to the support member; The vibration-proofing material is a package containing powder or granular material, The package supports the support member on a surface opposite to a surface that contacts the seat surface or the back surface.

3. 3. The seat according to claim 1, wherein at least one of the contact surfaces between the vibration-proof material and the support member and the contact surface between the vibration-proof material and the recess in the seat surface or back surface is provided in a plurality of contact surfaces.

4. The seat is a plurality of the piezoelectric sensors and a plurality of the support members corresponding to each of the plurality of the piezoelectric sensors; The seat according to claim 1 , wherein the plurality of support members are disposed within a single recess and support corresponding ones of the piezoelectric sensors, respectively.

5. A seat provided on a moving body, comprising: a piezoelectric sensor having a first surface located on a body side of a seated occupant and a second surface facing the first surface, the piezoelectric sensor sensing ballistocardial movement of the seated occupant through the first surface; a support member disposed inside a recess formed in at least one of a seat surface or a back surface of the seat and supporting the piezoelectric sensor from the second surface, a gap is provided between at least a portion of the surface of the support member and the inner wall of the recess so that the surface and the inner wall do not come into contact with each other; The seat, wherein the support member is disposed on a net stretched between opposing positions on the inner walls of the recess and is supported by the net.

6. The seat according to claim 1 , wherein the first surface of the piezoelectric sensor is substantially flat with a surface of the seating surface or the back surface.

7. The seat or back surface has a first surface located on the body side of the seated person and a second surface opposite to the first surface, The recess in which the support member is disposed is formed in a first surface of the seat surface or the back surface, The seat according to claim 1 , wherein a recess is formed in at least a part of an area of ​​the second surface of the seating surface or the back surface facing the recess in which the support member is disposed.

8. The controller of the moving object includes: A seat as described in any one of claims 1 to 7, which, when the sensing result by the piezoelectric sensor satisfies a predetermined condition regarding the ballistocardial movement of the occupant, performs at least one of the following processing: outputting a signal to notify information regarding the status of the occupant, and processing related to the movement of the moving body.

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