WO2022003993A1 - 計測装置、及び当該計測装置を有する車両用シート - Google Patents

計測装置、及び当該計測装置を有する車両用シート Download PDF

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Publication number
WO2022003993A1
WO2022003993A1 PCT/JP2020/038060 JP2020038060W WO2022003993A1 WO 2022003993 A1 WO2022003993 A1 WO 2022003993A1 JP 2020038060 W JP2020038060 W JP 2020038060W WO 2022003993 A1 WO2022003993 A1 WO 2022003993A1
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WIPO (PCT)
Prior art keywords
bag
shaped member
differential pressure
pad
pressure sensor
Prior art date
Application number
PCT/JP2020/038060
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English (en)
French (fr)
Japanese (ja)
Inventor
勲 松田
順二 尾下
隆夫 渋谷
栄 茂木
裕城 堀内
Original Assignee
太陽誘電株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 太陽誘電株式会社 filed Critical 太陽誘電株式会社
Priority to JP2022533023A priority Critical patent/JPWO2022003993A1/ja
Publication of WO2022003993A1 publication Critical patent/WO2022003993A1/ja

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/90—Details or parts not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/02—Measuring force or stress, in general by hydraulic or pneumatic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values

Definitions

  • the present invention relates to a measuring device for measuring differential pressure and a vehicle seat having the measuring device.
  • Patent Document 1 shows a technique for measuring a vital signal on a bed or the like using a piezoelectric element, but this technique cannot be appropriately measured if there is body movement or other disturbance vibration.
  • the measuring device according to the present technology is mounted on an automobile and traveled, the vital signal cannot be detected due to the saturation of the signal as shown in FIG. 1 due to road noise or the like.
  • the vertical axis represents the signal amplitude [V]
  • the horizontal axis represents time.
  • the signal is not saturated when stopped, but the output signal of the measuring device is saturated during traveling.
  • one pressure fluctuation signal deriving means pays attention to the problem that the output signal of the pressure sensor is saturated due to the road noise during traveling and the biometric information at a minute level including the heartbeat signal cannot be detected.
  • a biometric information detection device is disclosed in which the pressure received in is transmitted by two filters having a predetermined transmission function and measured by a differential pressure sensor.
  • a container having a predetermined size is provided separately from the pressure fluctuation signal deriving means and the differential pressure sensor, and the overall size becomes large. Also, the adjustment of the actual container or tube to realize the predetermined transfer function becomes a problem.
  • an object of the present invention is, according to one aspect, to provide a novel technique for facilitating detection of a minute signal without signal saturation even in a noisy environment.
  • the measuring device has (A) a first bag-shaped member that receives a first vibration, (B) a second bag-shaped member that receives a second vibration, and (C) a first bag-shaped member. It has a differential pressure sensor that detects a differential pressure between a first pressure transmitted from the inside of the member and a second pressure transmitted from the inside of the second bag-shaped member.
  • FIG. 1 is a diagram for presenting a problem of the prior art.
  • FIG. 2 is a diagram showing an outline of a measuring device according to an embodiment of the present invention.
  • FIG. 3 is a diagram showing an assumed example of the time change of the pressure received by the first pad.
  • FIG. 4 is a diagram showing an assumed example of the time change of the pressure received by the second pad.
  • FIG. 5 is a diagram showing an assumed example of a time change of the pressure detected by the piezoelectric element of the differential pressure sensor.
  • FIG. 6 is a diagram showing a hypothetical example of a signal when the detected pressure is amplified by an amplifier.
  • FIG. 7 is a diagram showing a measurement example of the measuring device according to the present embodiment.
  • FIG. 1 is a diagram for presenting a problem of the prior art.
  • FIG. 2 is a diagram showing an outline of a measuring device according to an embodiment of the present invention.
  • FIG. 3 is a diagram showing an assumed example of the time change of the pressure received by the
  • FIG. 8 is a diagram showing an assumed example of the measurement result of the first pressure sensor when the active noise canceller is adopted.
  • FIG. 9 is a diagram showing an assumed example of the measurement result of the second pressure sensor when the active noise canceller is adopted.
  • FIG. 10 is a diagram showing an example of a case where the signal of FIG. 8 is converted into an electric signal and amplified.
  • FIG. 11 is a diagram showing an example of a case where the signal of FIG. 9 is converted into an electric signal, amplified, and converted into an opposite phase.
  • FIG. 12 is a diagram showing an example of a signal obtained by adding the signal of FIG. 10 and the signal of FIG. 11.
  • FIG. 13 is a diagram showing an assumed example of the measurement result of the first pressure sensor when the noise is larger than that of FIG. FIG.
  • FIG. 14 is a diagram showing an example of a case where the signal of FIG. 13 is converted into an electric signal and amplified.
  • FIG. 15 is an external perspective view of the differential pressure sensor.
  • FIG. 16 is a perspective view of the differential pressure sensor when the upper lid is removed.
  • FIG. 17 is a cross-sectional view of the differential pressure sensor.
  • FIG. 18 is a diagram showing a configuration example of the entire measuring device.
  • FIG. 19 is a perspective view of an automobile seat.
  • FIG. 20 is a diagram showing an arrangement example of a first case in which two pads are arranged side by side and brought close to each other.
  • FIG. 21 is a diagram showing an arrangement example of a case in which two pads are arranged so as to be in contact with each other vertically.
  • FIG. 20 is a diagram showing an arrangement example of a first case in which two pads are arranged side by side and brought close to each other.
  • FIG. 21 is a diagram showing an arrangement example of a case in which two pads are arranged
  • FIG. 22 is a diagram showing an arrangement example of a case in which two pads are arranged so as to be vertically separated from each other.
  • FIG. 23 is a diagram showing an example of a pad arrangement in which it is difficult to extract vital signals.
  • FIG. 24 is a diagram showing an example of a pad arrangement in which it is difficult to extract vital signals.
  • FIG. 25 is a diagram showing an example of the result of processing the output of the differential pressure sensor with a bandpass filter when traveling at 10 km / h.
  • FIG. 26 is a diagram showing an example of a pulse wave signal measured by attaching a pulse wave sensor to a fingertip.
  • FIG. 27 is a diagram showing an example of the result of performing an FFT on the signal shown in FIG. 26.
  • FIG. 28 is a diagram showing an example of the result of performing an FFT on the signal shown in FIG. 25.
  • FIG. 29 is a diagram showing an example of the result of processing the output of the differential pressure sensor with a bandpass filter when traveling at 30 km / h.
  • FIG. 30 is a diagram showing an example of the result of performing an FFT on the signal shown in FIG. 29.
  • FIG. 31 is a diagram showing an example of the result of processing the output of the differential pressure sensor with a bandpass filter when traveling at 50 km / h.
  • FIG. 32 is a diagram showing an example of the result of performing an FFT on the signal shown in FIG. 31.
  • FIG. 33 is a diagram showing an example of a mat for evaluating the separation distance of the pad.
  • FIG. 34 is a diagram showing a first pattern of pad arrangement.
  • FIG. 35 is a diagram showing a second pattern of pad arrangement.
  • FIG. 36 is a diagram showing a third pattern of pad arrangement.
  • FIG. 37 is a diagram showing an example of a signal output in the first pattern.
  • FIG. 38 is a diagram showing an example of a signal output in the second pattern.
  • FIG. 39 is a diagram showing an example of a signal output in the third pattern.
  • FIG. 40 is a diagram showing an example of a signal when the gain of the amplifier is lowered as compared with the case of FIG. 39.
  • FIG. 41 is a diagram showing an example of the result of processing the signal of FIG. 37 with a bandpass filter.
  • FIG. 42 is a diagram showing an example of the result of FFT for the signal of FIG. 41.
  • FIG. 43 is a diagram showing an example of the result of processing the signal of FIG. 38 with a bandpass filter.
  • FIG. 44 is a diagram showing an example of the result of FFT for the signal of FIG. 43.
  • FIG. 45 is a diagram showing an example of the result of processing the signal of FIG. 39 with a bandpass filter.
  • FIG. 46 is a diagram showing an example of the result of FFT for the signal of FIG. 45.
  • FIG. 47 is a diagram showing an example of the result of processing the signal of FIG. 40 with a bandpass filter.
  • FIG. 48 is a diagram showing an example of the result of FFT for the signal of FIG. 47.
  • FIG. 49 is a diagram for explaining how standard noise is transmitted.
  • FIG. 50 is a diagram showing a modified example of the pad size when dealing with noise from above.
  • FIG. 51 is a diagram showing a modified example of the tube when dealing with noise from above.
  • FIG. 52 is a diagram showing a modified example of the space in the differential pressure sensor when dealing with noise from above.
  • FIG. 53 is a diagram showing a modified example of the pad size when dealing with noise from below.
  • FIG. 54 is a diagram showing a modified example of the tube when dealing with noise from below.
  • FIG. 55 is a diagram showing a modified example of the space in the differential pressure sensor when dealing with noise from below.
  • FIG. 56 is a diagram showing a simplified cross-sectional view of a first modification of the seat.
  • FIG. 57 is a diagram showing a simplified cross-sectional view of a second modification of the seat.
  • FIG. 58 is a diagram showing a basic example of pad arrangement.
  • FIG. 59 is a diagram showing an example of pad arrangement using a plate.
  • FIG. 60 is a cross-sectional perspective view of a pad with a plate portion.
  • FIG. 61 is a diagram showing an example of pad arrangement using a pad with a plate portion.
  • FIG. 62 is a diagram showing another example of pad arrangement using a pad with a plate portion.
  • FIG. 63 is a diagram showing still another example of pad arrangement using a pad with a plate portion.
  • FIG. 64 is a diagram showing a configuration example in which a plate portion is attached to an integrated pad.
  • FIG. 65 is a diagram showing an arrangement example of an integrated pad with a plate portion.
  • FIG. 66 is a diagram showing an example of pad arrangement using a gap and a plate.
  • FIG. 67 is a diagram showing another example of pad arrangement using voids and plates.
  • FIG. 68 is a diagram showing still another example of pad arrangement using voids and plates.
  • FIG. 69 is a diagram showing a measurement result when the capacitance type differential pressure sensor is configured so as not to measure the differential pressure and the measurement is performed.
  • FIG. 70 is a diagram showing a measurement state of FIG. 69.
  • FIG. 71 is a diagram showing a measurement result when the measurement is performed by the capacitance type differential pressure sensor.
  • FIG. 72 is a diagram schematically showing an output mode of a measurement result when the measuring device is mounted on an automobile.
  • a measuring device for solving the above-mentioned problems.
  • This measuring device includes (a) a first bag-shaped member that receives the first vibration, (b) a second bag-shaped member that receives the second vibration, and (c) the inside of the first bag-shaped member. It has a differential pressure sensor that detects the differential pressure between the first pressure transmitted from the bag and the second pressure transmitted from the inside of the second bag-shaped member.
  • the first pressure due to the first vibration input via the first bag-shaped member and the second pressure due to the second vibration input via the second bag-shaped member can be measured appropriately. For example, if the same noise is on the first pressure and the second pressure, they are canceled by the structure of the differential pressure sensor, and if any of the bag-shaped members has a weak vibration of the object to be measured. , The weak signal corresponding to the weak vibration of the measured object can be detected without saturation.
  • the measuring device has (d) a first tube connecting between the first bag-shaped member and the differential pressure sensor, and (e) a second tube connecting between the second bag-shaped member and the differential pressure sensor. It may have 2 tubes further.
  • the differential pressure sensor can be arranged at a position away from the first and second bag-shaped members.
  • the position may be restricted so that the first bag-shaped member and the second bag-shaped member are arranged in close contact with each other or separated from each other so as to be overlapped with each other.
  • This is a more preferable configuration for measuring vital signals. That is, it is effective in canceling noise.
  • the bag-shaped member has a flat plate shape, it is easier to receive vibration, and if it is stacked, it can be arranged in a small space. Further, if it is installed on a seat cushion or the like, it becomes easy to apply the same load to both.
  • the first bag-shaped member and the second bag-shaped member may not only be in close contact with each other, but may also be overlapped with a resin or the like sandwiched between them.
  • first bag-shaped member and the second bag-shaped member may be arranged so as to be overlapped with each other in close contact with each other or separated from each other.
  • first bag-shaped member and the second bag-shaped member may be stacked in layers, and other materials may be arranged between the two bag-shaped members. It may not be the case. It becomes easier to detect a weak signal. In this way, noise can be canceled more effectively.
  • first bag-shaped member and the second bag-shaped member are flat plates, and the first bag-shaped member and the second bag-shaped member are overlapped with each other so that the central portions of the flat plates are in close contact with each other or separated from each other. It may be integrated into. If integrated, there will be no deviation between the first bag-shaped member and the second bag-shaped member, so that the relative position change between the first bag-shaped member and the second bag-shaped member during use will occur. Will be able to prevent.
  • the first bag-shaped member and the second bag-shaped member may be in close contact with each other or may be arranged apart from each other.
  • a plate portion may be provided on at least a part of at least one of the edges of the first bag-shaped member and the second bag-shaped member. For example, even when it is embedded in a seat cushion for a vehicle, it is possible to suppress the sinking of the bag-shaped member due to a load, and it becomes easy to detect a weak signal. Subduction consumes energy and makes the signal weaker, but by preventing subduction, a stronger signal can be captured.
  • first bag-shaped member and the second bag-shaped member are integrated, and extend outward to at least a part of the outer periphery of the integrated first and second bag-shaped members.
  • the existing plate portion may be added. Even if one plate portion is provided on each of the two bag-shaped members instead of providing the plate portion on each bag-shaped member, the sinking of the bag-shaped member due to the load can be suppressed.
  • the resin may be added to the first bag-shaped member and the second bag-shaped member.
  • the resin may be added so as to cover at least one surface of the first bag-shaped member and the second bag-shaped member.
  • the resin can protect the bag-shaped member, regulate the position, and adjust the way vibration is transmitted.
  • a resin layer may be provided between the first bag-shaped member and the second bag-shaped member.
  • the differential pressure sensor may be a capacitance type differential pressure sensor, a piezo resistance type differential pressure sensor, or a differential transformer type differential pressure sensor. If the detection target detects a signal having a relatively large amplitude such as a body movement, various types of differential pressure sensors that have existed in the past can be adopted.
  • the differential pressure sensor has a first chamber communicating with the inside of the first bag-shaped member, a second chamber communicating with the inside of the second bag-shaped member, a first chamber, and a second chamber. It may be a differential pressure sensor having a diaphragm separated from the chamber and formed with a piezoelectric body. By adopting such a differential pressure sensor, even a weak signal such as a pulse wave can be detected without signal saturation due to noise.
  • the first bag-shaped member may be arranged closer to the object to be measured than the second bag-shaped member. By arranging one of the bag-shaped members near the object to be measured, it becomes easier to detect a weaker signal.
  • the measuring device may further include (d) a signal processing unit that processes a signal from a differential pressure sensor, and (e) an output unit that outputs an output signal of the signal processing unit to an external device. .. As a result, signal processing is appropriately performed for the weak signal to be detected.
  • the target of installation of the measuring device mentioned above is, for example, a vehicle seat such as an automobile. That is, the vehicle seat includes (f) a first bag-shaped member, (g) a second bag-shaped member, and (h) a first pressure transmitted from the inside of the first bag-shaped member. It has a differential pressure sensor that detects the differential pressure from the second pressure transmitted from the inside of the second bag-shaped member, and the first bag-shaped member is inside the portion where a predetermined part of the human body hits. It is arranged so as to be closer to a predetermined part of the human body than the bag-shaped member of 2.
  • the part of the human body that hits the predetermined part is mainly the seat part or the back part. If it is a sitting part, it is suitable for detecting pulse waves, pulses, or breathing from the arteries of the soles or hips, or from the movement of the human body surface, and if it is the back part, it is suitable from body movements or from the waist. Pulses, breaths, etc. can be detected from the movements of the arteries on the back and the surface of the human body.
  • first bag-shaped member and the second bag-shaped member may be closely or separatedly overlapped and provided in the resin material of the portion where the predetermined part of the human body hits. By doing so, it becomes easier to cancel the noise and it becomes easier to detect a weak signal.
  • a member including the first bag-shaped member and the second bag-shaped member may be arranged in a groove or a recess that regulates the positions of the first bag-shaped member and the second bag-shaped member. ..
  • the first bag-shaped member and the second bag-shaped member are arranged so as to easily detect a weak signal while suppressing the positional deviation.
  • its road noise changes over time. At that time, if the bag-shaped members are displaced together in the horizontal direction or the vertical direction, the signals entering the two bag-shaped members tend to be different.
  • a plate wider than the area of the second bag-shaped member may be provided below the second bag-shaped member. This is because the plate suppresses the sinking of the first bag-shaped member and the second bag-shaped member due to the load of the human body and the attenuation of the weak signal.
  • a gap may be provided below the plate, or a gap may be provided between the second bag-shaped member and the plate. This is because the void suppresses disturbance vibration from below the void.
  • the part of the human body that hits a predetermined part may be made of effervescent resin. This protects the first bag-shaped member and makes it easier to receive a weak signal. It is also effective in terms of sitting comfort, that is, in terms of suppressing the discomfort of the buttocks when sitting.
  • the vehicle seat may also be adopted for the vehicle seat.
  • the differential pressure sensor is provided on the seat for the vehicle, the vital signal of the driver or the like can be detected. Therefore, by analyzing such vital signals and the like, it is possible to determine the stress and health condition of the driver, determine whether or not to continue driving, and take measures to change the mood. For example, if an abnormality is detected in a driver's vital signal or the like, the vehicle can be stopped in advance and an accident can be prevented by issuing a vehicle stop command to a control circuit that controls driving. In addition, if this vital signal or the like is recorded in the recorder, the health condition of the driver can be saved as data and can be provided as a police investigation or an insurance company investigation, which is useful for investigating the cause of an accident and preventing an accident.
  • FIG. 2 shows an outline of the measuring device according to the embodiment of the present invention.
  • the measuring device 100 includes a differential pressure sensor 110, a tube 130 connecting the first pad 150 and the second pad 160 which are fluid inclusion bodies, the differential pressure sensor 110 and the first pad 150, and the differential pressure sensor 110. It has a tube 140 connecting the pad 160 and the second pad 160.
  • the differential pressure sensor 110 is provided with a first space 112 and a second space 114 in the housing 111, and the first space 112 and the second space 114 are referred to as a vibrating membrane (or a diaphragm). ) Separated by 116.
  • a piezoelectric element 118 is formed on the vibrating film 116 (in the example of FIG. 2, the surface on the first space 112 side).
  • a signal line to the signal processing unit is connected to the piezoelectric element 118, and the signal processing unit receives signals such as amplification, a band path filter, and an FFT (Fast Fourier Transform) with respect to the output signal from the piezoelectric element 118. The process is executed.
  • the piezoelectric element 118 may be provided on the surface of the vibrating membrane 116 on the second space 114 side.
  • the housing 111 is divided into two chambers by a vibrating membrane 116.
  • the vibrating membrane 116 is the side wall of the first chamber corresponding to the first space 112, here the bottom surface, and further becomes the side wall of the second chamber corresponding to the second space 114, here the top surface. Therefore, unlike the case where the two chambers are prepared individually, the vibrating membrane can be shared between the bottom surface and the top surface, so that the size of the entire differential pressure sensor 110 can be reduced, and the vibrating membrane and the piezoelectric membrane can be paired.
  • the housing 111 is cylindrical as shown in FIG. 15, but may be a rectangular parallelepiped, a sphere, or the like.
  • the housing 111 of the differential pressure sensor 110 is provided with a first connection portion 120 and a second connection portion 122, and the first connection portion 120 is connected to the tube 130 to form a second connection portion. 122 is connected to the tube 140.
  • the tubes 130 and 140 may not be provided depending on the arrangement state of the differential pressure sensor 110, the first pad 150 and the second pad 160, and their lengths are adjusted.
  • the first pad 150 and the second pad 160 are hollow bag-shaped members, and in the present embodiment, air is sealed as a fluid at the time of use. Therefore, the first pad 150 communicates with the first space 112 of the differential pressure sensor 110 via the tube 130 and the first connection portion 120, and the vibration received by the first pad 150 is generated. , Will be transmitted to the vibrating membrane 116. Similarly, the second pad 160 communicates with the second space 114 of the differential pressure sensor 110 via the tube 140 and the second connection portion 122, and the vibration received by the second pad 160. Will be transmitted to the vibrating membrane 116. In addition, such a pad is also referred to as an air mat.
  • the outer shape of the first pad 150 and the second pad 160 is like a thin rectangular parallelepiped, for example, a small air mat or a cushion, or a circular or elliptical edible pie dough in a plan view. It is shaped like a hollow bag. In addition, the pressure is maintained so that it will not be crushed by the weight of the subject.
  • the bag is filled with a gas, fluid or gel and is made of a resin that can be deformed when a load is applied.
  • the two pads have the same size, for example, width 40 mm, depth 40 mm, and thickness 5 mm.
  • the first pad 150 and the second pad 160 are installed in places where vital signals (for example, pulse waves) of the human body can be detected, such as automobile seats, desk chairs, beds, mats, and wristwatches, and body movements and loads are performed. Detects vibrations corresponding to vital signals as well as disturbances such as noise.
  • vital signals for example, pulse waves
  • the noise component is mechanically canceled by the vibrating membrane 116 and only the vital signal is received. Will be detected by the piezoelectric element 118. As a result, even when the noise is large, the vital signal can be detected without saturating the signal output from the piezoelectric element 118.
  • FIG. 3 shows a state in which a pressure change in which a high-frequency vital signal component is carried occurs with respect to a low-frequency, large-amplitude noise component.
  • FIG. 4 shows how the pressure change occurs only by the noise component having a large amplitude at a low frequency.
  • the electric signal corresponding to the vital signal can be output without the signal being saturated, and useful information can be obtained in the signal processing for the electric signal. You will be able to get it.
  • FIG. 7 it is a measurement example in the case where the running is started from the stopped state and the running is performed at a constant speed of 20 km / h. Except for the initial section of the start of running, the signal can be measured without saturation.
  • FIG. 1 shows the results of measurement under the same conditions as those in FIG. 7 except that the technique of Patent Document 1 is used. Has occurred.
  • FIG. 8 shows a state in which a high-frequency vital signal component is placed on the low-frequency noise component, but the low-frequency noise component is not as large as in FIG.
  • FIG. 9 shows a state in which the same low frequency noise component as in FIG. 8 is detected.
  • the noise component is not so large, a high-frequency vital signal component can be obtained, and when the noise component becomes large, the high-frequency vital signal component disappears.
  • the pressure change as shown in FIG. 13 is detected by the first pressure sensor, the pressure change is converted into an electric signal and amplified at the same amplification factor, the signal as shown in FIG. 14 is obtained. It will be like. That is, some signals have exceeded the upper limit and the lower limit (here, ⁇ 10 V), and the high frequency signal component has disappeared.
  • the noise component can be mechanically canceled and the vital signal component can be extracted without saturation. become.
  • the noise is completely removed by the difference even if the noises and vitals have the same frequency, so the vitals are ideally extracted. If the pressure of the two pads is canceled by the diaphragm in the sensor, no saturation will occur in the subsequent analog circuits.
  • FIG. 15 shows an external perspective view of the differential pressure sensor 110.
  • the differential pressure sensor 110 in this example has a substantially cylindrical shape, and has a first connection portion 120 (also referred to as an introduction tube) for connecting to the tube 130 and a tube 140 for connecting to the tube 140.
  • the second connecting portion 122 (also referred to as an introduction tube) has a shape protruding from the cylinder.
  • the upper lid 1101 of the housing 111 of the differential pressure sensor 110 is separable from the housing 111.
  • FIG. 16 shows a state in which the upper lid 1101 is removed.
  • the first space 112 that is, the chamber
  • a disk-shaped piezoelectric element 118 is formed at the bottom of the first space 112.
  • the two mountains indicate solder.
  • a sealing member or the like is provided between the upper lid 1101 and the housing 111 to prevent air leakage.
  • the hatched part is the inner wall of the housing.
  • FIG. 17 shows a cross-sectional view of the differential pressure sensor 110 in a plane passing through the first connecting portion 120 and the second connecting portion 122.
  • the piezoelectric element 118 is formed by the piezoelectric body 1181 and the vibrating film 116. That is, the solder 1182 is provided on the electrode of the piezoelectric body 1181 and the leads are fixed and connected, the vibrating membrane 116 is the other electrode, and the solder 1161 is provided on the vibrating membrane 116 and the leads are connected.
  • the vibrating film 116 is a metal disk such as brass, and its edge is supported and fixed by a convex portion provided around the inner wall of the housing 111 in a ring shape.
  • a plating film that improves the wettability of the solder for example, copper plating or gold plating may be applied.
  • the vibrating membrane 116 has a disk shape, and a small disk-shaped piezoelectric body 1181 is provided on the disk shape. It is preferable that they are provided so that their centers are aligned with each other.
  • the vibration is higher in the vertical direction at the center of the vibrating membrane 116, and in order for the piezoelectric body to receive the vibration well, the detection accuracy is higher when the centers are aligned.
  • the vibrating membrane 116 has a diameter of 15 mm and a thickness of 0.05 mm
  • the piezoelectric body 1181 has a diameter of 12 mm and a thickness of 0.05 mm.
  • the vibrating membrane since the lead is fixed with solder or conductive paste, a metal to which this conductive adhesive can be applied is selected as the vibrating membrane.
  • a metal to which this conductive adhesive can be applied is selected as the vibrating membrane.
  • brass is used.
  • the vibrating film 116 may be a ceramic, a nickel alloy, an alloy mainly made of copper, stainless steel, or the like.
  • the vibrating membrane 116 vibrates, consider the reliability of solder adhesion. Vibration is large in the center of the disk-shaped or quadrangular vibration film 116 and in or near the center of the disk-shaped or quadrangular piezoelectric body 1181.
  • the fixed portion is preferably the outer circumference of a circle, the outer circumference of a square or the outer circumference thereof, or the vicinity of the outer circumference.
  • the vibrating membrane 116 is fixed to the convex portion in the vicinity of the outer periphery thereof. Since vibration is suppressed in this fixed portion or in the vicinity thereof, it is preferable to fix it here.
  • a solder connection portion is provided on the convex portion.
  • the piezoelectric body 1181 has an electrically fixed portion in the vicinity of the convex member (edge of the piezoelectric body), although the top of the convex portion is avoided.
  • the vibrating film 116 is provided with an electrically fixing portion in the vicinity of the outer periphery (edge) on the convex portion or in the vicinity of the convex portion. It was
  • the lead wires extending from the solders 1182 and 1161 are connected to the circuit in the third space 124 provided in the housing 111.
  • solder depending on the material of the vibrating film 116 (for example, ceramic or stainless steel), copper having good wettability of the solder, a film of an alloy containing copper as the main material, etc. are formed, and the solder is passed through the film. It may stick.
  • the volume of the first space 112 and the volume of the second space 114 are the same. That is, the main internal space of the housing 111 is bisected by the vibrating membrane 116.
  • the third space 124 is provided in the lower part of the second space 114 separately from the second space 114, and in the third space 124, the circuit board 1241 and the circuit board 1241 are analog.
  • a circuit component 1242 such as an amplifier is provided.
  • the housing 111 is molded in advance, it is better to provide the lead via the solder on the upper side with the upper lid removed, considering the connection with the circuit component 1242 and the workability. Is improved.
  • the circuit board 1241 is provided inside the differential pressure sensor 110 in order to save space, but it may be provided outside the differential pressure sensor 110.
  • the circuit component 1242 is connected to a circuit outside the differential pressure sensor 110 by a lead wire (not shown), and an amplified or attenuated signal is output by the analog amplifier included in the circuit component 1242.
  • the change in air pressure due to the vibration transmitted from the first connection portion 120 is transmitted to the vibrating membrane 116 via the first space 112 (that is, the chamber).
  • the change in air pressure due to vibration transmitted from the second connecting portion 122 is transmitted to the vibrating membrane 116 via the second space 114 (that is, the chamber).
  • the vibrating membrane 116 receives air pressure on both the upper and lower surfaces and bends due to the difference between the air pressures, and the piezoelectric body 1181 is deformed by the bending, and an electric signal corresponding to the deformation is output.
  • FIG. 2 shows only the outline of the measuring device 100 in order to show the outline of the present embodiment, but the measuring device 100 of FIG. 2 shows the output signal of the differential pressure sensor 110 (more specifically, the output of the piezoelectric element 118). A component that processes a signal is added to the signal).
  • FIG. 18 shows an example of the overall configuration of the measuring device 100.
  • the present embodiment includes a measuring unit 210 including a first pad 150 and a second pad 160, and a sensor unit 220 including a differential pressure sensor 110, circuit components 1242 such as an analog amplifier, and a signal processing device 2210. ..
  • a first pad 150 and a second pad 160 of the same size are used, and a tube of the same size (inner diameter ⁇ 2 mm) made of rubber is used.
  • the tube 130 was connected to the first pad 150, and the tube 140 was connected to the second pad 160.
  • the measuring unit 210 and the sensor unit 220 can be installed at separate locations. Further, the circuit component 1242 may be provided inside the differential pressure sensor 110 as shown in FIG. 16, or may be included in the signal processing device 2210.
  • the signal processing device 2210 has, for example, an amplifier 2211 whose gain can be adjusted, a processing unit 2212, a memory 2213, and an output unit 2214.
  • the processing unit 2212 sets the gain of the amplifier 2211 as needed. Further, the processing unit 2212 digitizes the output of the amplifier 2211 and executes a program prepared in advance to execute signal processing such as a bandpass filter and an FFT (Fast Fourier Transform).
  • the predetermined program and measurement data are stored in the memory 2213.
  • the processing result of the processing unit 2212 is output to an external device via the output unit 2214.
  • the output unit 2214 may be a display device or a printing device in some cases, and may be a wired or wireless communication device in some cases, and may communicate with an external device.
  • the output signal of the circuit component 1242 is digitized and then output to another device so that the signal processing is performed by the other device. You can do it.
  • a bandpass filter is configured so as to pass through the frequency band of the vital signal, but when processing other signals, another filter may be configured. ..
  • the same pressure in order to cancel the noise component given from the outside, it is preferable to simultaneously transmit the same pressure to the first space 112 and the second space 114. That is, it is preferable to add the same noise component to the first pad 150 and the second pad 160 so that the pressure of the vital component is transmitted to one of them.
  • FIG. 19 is a perspective view of an automobile seat, in which the vertical direction of the perspective view is the Z axis, an XY plane is defined with respect to a certain plane in the seat cushion 4000, and the direction toward the seat back 4500 is Y. As the axis, the direction perpendicular to it is the X axis.
  • FIG. 21 shows a case in which the first pad 150 and the second pad 160 are overlapped so as to be in contact with each other
  • FIG. 22 shows a case in which the first pad 150 and the second pad 160 are arranged apart from each other in the Z-axis direction. Is. Both the cases of FIGS. 21 and 22 are arranged so as to completely overlap each other in the Z-axis direction, but a slight deviation may occur. That is, it is effective if the central parts are arranged so as to overlap each other.
  • the sitting style may shift and the load of the human body 5000 (for example, legs) on the pad may differ. Therefore, the second case overlapped on the Z axis rather than the first case arranged in the X direction. Case is preferable.
  • the two pads should have their outer shape and their center aligned.
  • the noise that enters the two pads can be more approximated and easily canceled.
  • the road noise waveform differs depending on the position of the road. Therefore, in order to make the two pads have substantially the same noise, it is better to match the outer shape and the center thereof for higher accuracy.
  • two pads are provided in the groove for the position regulation.
  • the pad is rectangular in a plan view as shown in FIG. 22, a pair of facing two sides is regulated, but a groove may be provided so as to regulate two facing sides.
  • a recess may be provided so as to regulate the movement in the X direction and the Y direction.
  • the first pad 150 and the second pad 160 are arranged side by side in the X-axis direction, but they are separated from each other in the third case, or as shown in FIG. 24, in the X-axis direction. It was found that the noise canceling effect could not be obtained and it was difficult to extract the vital signal in the fourth case in which the vital signals were arranged apart from each other in the Z-axis direction.
  • FIG. 25 is a diagram showing an example of the output signal of the bandpass filter when the signal is processed by the bandpass filter which is measured when traveling at 10 km / h and passes 1-3 Hz.
  • FIG. 26 shows an example of a signal obtained when a pulse wave sensor is attached to a fingertip under the same conditions as in FIG. 25.
  • FIG. 25 shows a state in which signals of various frequencies are superimposed, and
  • FIG. 26 shows a pulse wave that repeats at a substantially constant cycle.
  • the vertical axis of FIGS. 25 and 26 represents the signal amplitude [V], and the horizontal axis represents the time [seconds].
  • the DC component is left and displayed.
  • FIG. 27 shows the result of performing an FFT on the signal shown in FIG. 26.
  • the pulse wave peak a can be detected at about 1.17 Hz, and the other peaks are its harmonics.
  • FIG. 28 the result of performing FFT on the signal shown in FIG. 25 is shown in FIG. 28.
  • the peak b corresponding to the peak a can be detected with a certain intensity.
  • the noise component exists in a portion close to this peak b.
  • the vertical axis of FIGS. 27 and 28 represents power, and the horizontal axis represents frequency [Hz].
  • FIG. 29 is a diagram showing an example of the output signal of the bandpass filter when the signal is processed by the bandpass filter which is measured when traveling at 30 km / h and passes 1-3 Hz.
  • the DC component is left and displayed.
  • FIG. 29 is a diagram of the same format as FIGS. 25 and 26.
  • the signal example obtained when the pulse wave sensor is attached to the fingertip under this condition is slightly different from that in FIG. 26, but it is the same as the pulse wave that is repeated at a substantially constant cycle, and thus is omitted.
  • the FFT result is also omitted in the same manner.
  • FIG. 30 shows the result of performing an FFT on the signal shown in FIG. 29.
  • the peak c corresponding to the peak a of about 1.17 Hz can be detected as a large peak. Further, since the noise component moves to the high frequency side as compared with the case of FIG. 28, it is easier to detect the peak c.
  • FIG. 30 is a diagram having the same format as that of FIGS. 27 and 28.
  • FIG. 31 is a diagram showing an example of the output signal of the bandpass filter when the signal is processed by the bandpass filter which is measured when traveling at 50 km / h and passes 1-3 Hz.
  • the DC component is left and displayed.
  • FIG. 31 is a diagram in the same format as FIGS. 25 and 26.
  • the signal example obtained when the pulse wave sensor is attached to the fingertip under this condition is slightly different from that in FIG. 26, but it is the same as the pulse wave that is repeated at a substantially constant cycle, and thus is omitted.
  • the FFT result is also omitted in the same manner.
  • FIG. 32 shows the result of performing an FFT on the signal shown in FIG. 31.
  • the peak d corresponding to the peak a of about 1.17 Hz can be detected as a large peak. Further, since the noise component is further moved to the high frequency side as compared with the case of FIG. 28, it is easier to detect the peak d.
  • FIG. 32 is a diagram having the same format as that of FIGS. 27 and 28.
  • noise component could be completely canceled, but in reality, the noise caused by body movement and the road noise are generated asynchronously, and the transmission to the two pads is not the same, so measurement is performed at the same time.
  • a noise component remains in the differential pressure. However, if most of the noise components can be removed, signal saturation can be avoided, and vital signals can be extracted by signal processing.
  • FIG. 33 shows the urethane mat 7000, which is the material of the seat cushion, for this evaluation.
  • the urethane mat 7000 was arranged on the seat cushion 4000 shown in FIG. 19 in the axial direction as shown in FIG. 33.
  • the urethane mat 7000 is provided with a groove 7100 that matches the width of the first pad 150 and the second pad 160.
  • the measuring unit 210 including the first pad 150 and the second pad 160 is positioned and arranged so as to be fixed in the middle of the groove 7100.
  • the urethane mat 7000 is provided by restricting the position in the foamable urethane of the seat cushion.
  • the urethane 7200 is provided on the uppermost layer, and the first pad 150 and the second pad 160 are superposed under the urethane 7200, and the thickness of the urethane 7200 is, for example, 7 mm.
  • the layered structure of the urethane 7200 and the first pad 150 and the second pad 160 is integrally or separably integrated.
  • the two pads have the same size, for example, 40 mm in width, 40 mm in depth, and 5 mm in thickness.
  • urethane 7200 is provided on the uppermost layer, a first pad 150 is provided below the urethane 7200, a separation layer urethane 7300 is provided below the urethane pad 150, and a second pad 160 is provided below the urethane 7300. It is a pattern to provide.
  • the thickness of the urethane 7200 and 7300 is, for example, 10 mm.
  • the layered structure of the urethane 7200, the first pad 150, the urethane 7300, and the second pad 160 is integrally or separably integrated.
  • urethane 7200 is provided on the uppermost layer, a first pad 150 is provided below the urethane 7200, a separation layer urethane 7400 is provided below the urethane 7200, and a second pad 160 is provided below the urethane 7400. It is a pattern to provide.
  • the thickness of the urethane 7200 is, for example, 10 mm, and the thickness of the urethane 7400 is, for example, 20 mm.
  • the layered structure of the urethane 7200, the first pad 150, the urethane 7400, and the second pad 160 is integrally or separably integrated.
  • the top layer urethane 7200 is not available.
  • FIG. 37 shows an example of the output of the differential pressure sensor 110 (more specifically, the output of the amplifier 2211) when the vehicle adopts the first pattern and travels at 10 km / h. No signal saturation has occurred.
  • FIG. 38 shows an example of the output of the differential pressure sensor 110 (more specifically, the output of the amplifier 2211) when traveling at 10 km / h in an automobile adopting the second pattern. There is almost no signal saturation.
  • FIG. 39 shows an example of the output of the differential pressure sensor 110 (more specifically, the output of the amplifier 2211) when traveling at 10 km / h in an automobile adopting the third pattern. There is a little more signal saturation. It is considered that this is because the urethane 7400 in the separation layer became thicker and the effect of canceling the noise component by the two pads was weakened.
  • FIG. 40 shows an example of the case where the gain of the amplifier 2211 is lowered as compared with the case of FIG. 39. It can be seen that the signal saturation has been eliminated because the gain has decreased.
  • FIGS. 41 to 48 show the results of processing the signals shown in FIGS. 37 to 40 with the bandpass filter of 1 Hz to 3 Hz by the processing unit 2212, and the results of further FFT.
  • FIG. 41 When the signal of FIG. 37 is processed by the bandpass filter, the signal as shown in FIG. 41 is obtained. As can be seen from FIG. 41, the high frequency component is removed. Further, FIG. 42 shows the result of FFTing the signal of FIG. 41. In FIG. 42, the peak of the pulse wave can be clearly detected as the peak e.
  • FIG. 43 When the signal of FIG. 38 is processed by the bandpass filter, the signal as shown in FIG. 43 is obtained. As can be seen from FIG. 43, the high frequency component is removed. Further, FIG. 44 shows the result of FFTing the signal of FIG. 43. In FIG. 44, the peak of the pulse wave can be clearly detected as the peak f.
  • FIG. 45 shows the signal saturation was relatively large, but in FIG. 45, the high frequency component was removed by the bandpass filter, and the portion having a large amplitude disappeared.
  • FIG. 46 shows the result of FFTing the signal of FIG. 45. Also in FIG. 46, the peak of the pulse wave can be seen as the peak g, but the peak is lower than that of FIGS. 42 and 44. This is due to signal saturation, but pulse waves can be detected.
  • FIG. 47 shows the result of FFTing the signal of FIG. 47. Also in FIG. 48, the peak of the pulse wave can be seen as the peak h. It can be seen that this is larger than the peak g shown in FIG. 46, and the pulse wave can be detected more easily.
  • the peak of the pulse wave can be detected in any case, and the extraction from the noise component is possible. If the gain of the amplifier 2211 is adjusted, the pulse wave can be detected more appropriately.
  • urethane is an example, and may be a cushioning material made of another foamable resin material or another material.
  • the measuring unit 210 When the measuring unit 210 is used in a seat cushion (seat portion) provided in an automobile or the like, it is better to provide the measuring unit 210 in the resin used for the cushion in consideration of sitting comfort. Further, the measuring unit 210 may be provided on the same resin used for the cushion, and the measuring unit 210 may be provided on the seat cushion. It is better to use the resin used for the cushion as the cushioning material provided between the pads and above as shown in FIG. 34.
  • the volumes of the first pad 150 and the second pad 160 are the same, the volumes of the first space 112 and the second space 114 in the differential pressure sensor 110 are also the same, and the tubes 130 and the second space 114 are also the same.
  • the inner diameter and length of 140 were also assumed to be the same. In such a configuration, when the first pad 150 and the second pad 160 receive the same noise (body movement, road noise, etc.), for example, the first pad 150 mainly receives vital signals. It is effective for.
  • noise from above received by the first pad 150 on the upper side and lower side as schematically shown in FIG. 49.
  • the noise from the bottom (upward arrow) received by the second pad 160 on the side is equivalent, the noise from the top is attenuated and transmitted to the second pad 160 on the lower side, and the noise from the bottom is also transmitted to the upper side. Since the noise is similarly attenuated and transmitted to the first pad 150, the noise is easily canceled by the differential pressure sensor 110, and for example, the vital signal transmitted to the first pad 150 can be appropriately extracted.
  • the volume inside the first pad 150b is less than the volume inside the second pad 160b. .. By doing so, the noise from above is similarly transmitted from the first pad 150b to the second pad 160b.
  • the volume of the pad is adjusted by changing the height, width, length, etc. of the pad.
  • the shape of the pad may be any shape such as a rectangular parallelepiped, a cylinder, a triangular prism, a square prism, an ellipsoidal pillar, a sphere, and an ellipsoid. Further, these shape pads may be installed side by side, or a threshold may be provided in the middle of the shape to divide the shape into two.
  • the volume inside the tube 140b> the volume inside the tube 130b may be formed. Even in this way, the same effect as in FIG. 50 can be obtained.
  • the volume inside the tube is adjusted by changing the thickness and length of the tube.
  • the volume ratio in the differential pressure sensor 110b is changed as shown in FIG. 52. That is, the volume of the first space 112b may be less than the volume of the second space 114b. The same effect as in FIGS. 50 and 51 can be obtained.
  • the cylindrical differential pressure sensor 110 is shown in FIG. 15, it may be in the shape of a rectangular parallelepiped, a triangular prism, a square prism, an elliptical column, or the like.
  • the form is preferable. By doing so, the noise from below is similarly transmitted from the second pad 160c to the first pad 150c.
  • the method of pad adjustment is the same as that described above.
  • the volume inside the tube 130c may be greater than the volume inside the tube 140c. Even in this way, the same effect as in FIG. 53 can be obtained.
  • the method of adjusting the tube is the same as that described above.
  • the volume ratio in the differential pressure sensor 110c is changed, that is, the volume of the first space 112c is equal to the volume of the second space 114c. It may be in any form. The same effect as in FIGS. 53 and 54 can be obtained.
  • FIG. 56 a simplified cross-sectional view of a seat is shown in FIG. 56.
  • the seat includes a seat back 4500 and a seat cushion 4000, the seat cushion 4000 is covered with a cloth 4100, the lower portion thereof being fixed to a metal portion 6000.
  • the first pad 150 and the second pad 160 are arranged so as to be vertically overlapped with each other, but the upper side of the first pad 150 is in contact with the cloth 4100 and the lower side is in contact with the second pad 160. It has become.
  • the first pad 150 and the second pad 160 are connected to the sensor unit 220 via the tubes 130 and 140.
  • the sensor unit 220 is connected to cables 4200 including a power cable and the like, and the cables 4200 are pulled out from the seat cushion 4000.
  • first pad 150 and the second pad 160 are embedded in the seat cushion 4000.
  • a groove or a recess may be provided in order to regulate the position, and may be provided in the groove or the recess.
  • the upper side of the first pad 150 is on the cross 4100.
  • An arrangement that makes contact may be adopted.
  • a laminated body of pads in which urethane 7400 as a separation layer is provided in advance between the pads may be prepared and provided in the position restricting portion of the groove or the recess.
  • the first pad 150 and the second pad 160, the tubes 130 and 140, and the sensor unit 220 are preferably embedded in the seat cushion 4000 so as not to come into contact with the metal portion 6000 in order to suppress the influence of noise. .. As for the cables 4200, it is preferable not to touch the metal part 6000.
  • the cushioning material inside the seat is, for example, hard urethane, but the case of the sensor unit 220 may be embedded in the hard urethane, but the case of the sensor unit 220 may be mounted on another material (for example, soft urethane). After wrapping it in, it may be attached so as to be embedded in hard urethane.
  • the structure inside the case of the sensor unit 220 is also preferably a vibration-proof structure, and it is preferable to fix the differential pressure sensor 110 and the signal processing device 2210 on a base substrate placed on a vibration-proof column made of rubber, resin, or the like. .. Further, the anti-vibration column, the differential pressure sensor 110 and the signal processing device 2210 are fixed with screws or adhesives.
  • vital signals for example, pulse waves
  • the vibration including vital signals is consumed by the energy of the sinking and weakened. Is to deter.
  • FIG. 59 shows a first example for that purpose.
  • the configurations beyond the tubes 130 and 140 are omitted.
  • the first pad 150 and the second pad 160 are arranged one above the other in the seat cushion 4000, and then the first pad 150 and the second pad 160 are arranged below the second pad 160.
  • the plate 4600 is made of plastic, metal, or the like, and is harder than, for example, the first pad 150 and the second pad 160.
  • the plate 4600 may have any shape such as a circle or a quadrangle. By providing such a plate 4600, a fixed end effect that the plate 4600 does not sink below the plate 4600 can be obtained.
  • FIG. 60 is a perspective view of an elliptical pad (here, the first pad 150) cut at its central portion. That is, a plate portion 155 for suppressing subduction is added to the outer periphery of the first pad 150.
  • the first pad 150 and the plate portion 155 may be integrally formed, or the plate portion 155 may be adhered to the first pad 150 later. In the latter case, for example, the inner diameter of the plate portion 155 may be formed smaller than the outer diameter of the first pad 150 so that the overlapped portions are adhered to each other.
  • the outer diameter of the plate portion 155 may be any shape such as a circle or a quadrangle.
  • the arrangement is as shown in FIG. 61, for example. That is, the second pad 160 is superposed on the first pad 150 with the plate portion 155 in the seat cushion 4000. By doing so, the plate portion 155 can suppress the subduction of the first pad 150 and the second pad 160.
  • the plate portion 165 may be added to the second pad 160. That is, in the seat cushion 4000, the second pad 160 with the plate portion 165 is superposed on the first pad 150. Even in this way, the plate portion 165 can suppress the subduction of the first pad 150 and the second pad 160.
  • the first pad 150 with the plate portion 155 and the second pad 160 with the plate portion 165 may be arranged so as to be overlapped in the seat cushion 4000.
  • FIG. 64 is a perspective view of an elliptical pad (here, the first pad 150 and the second pad) cut at the central portion thereof. That is, the first pad 150 and the second pad 160 are separated by a partition wall 157 and integrated, and a plate portion 167 for suppressing sinking is added to the outer periphery of the integrally formed pad. ing.
  • a plate portion 167 may be integrally formed together with the first pad 150 and the second pad 160, but the plate portion 167 may be adhered to the integrally formed pad later.
  • the inner diameter of the plate portion 167 may be formed to be smaller than the outer diameter of the integrally formed pad so that the overlapped portions are adhered to each other.
  • the outer shape of the plate portion 167 may be any shape such as a circle or a quadrangle.
  • FIG. 65 When using such an integrated pad with a plate portion 167, the arrangement is as shown in FIG. 65, for example. That is, an integrated pad (first pad 150 and second pad 160) with a plate portion 167 is arranged in the seat cushion 4000. By doing so, it becomes possible to suppress the sinking of the pad integrated by the plate portion 167.
  • a gap may be provided in the seat cushion 4000 to suppress disturbance vibration from below.
  • the first pad 150 and the second pad 160 are arranged so as to overlap each other in the seat cushion 4000, and the plate 4600 is arranged under the second pad 160, and further, the plate is further arranged.
  • a gap 4700 is provided at the bottom of the 4600.
  • FIG. 66 shows an example in which the width of the gap 4700 is wider than the width of the first pad 150 and the second pad 160, but if a gap having a size appropriate for suppressing disturbance vibration is provided. good.
  • a gap 4750 may be provided between the second pad 160 and the plate 4600.
  • the width of the gap 4750 is narrower than the width of the first pad 150 and the second pad 160, in order to prevent the first pad 150 and the second pad 160 from falling into the gap 4750. Therefore, the size of the void 4750 is arbitrary as long as it can be prevented from falling into the void 4750 by other methods. Even with such a pad arrangement, it becomes possible to suppress disturbance from below.
  • the plate 4600 is directly below the second pad 160, but in order to obtain a damper effect for suppressing disturbance vibration from below, a configuration as shown in FIG. 68 is adopted. Is also good. That is, a layer of the high-resilience resin 4800 may be provided between the second pad 160 and the plate 4600. In this example, a gap 4700 is also provided in the lower part of the plate 4600, so that disturbance vibration from below can be suppressed.
  • first pad 150 and the second pad 160 may be bonded with an adhesive, bonded with an adhesive tape, or tape or sheet. You may wrap or wrap it with such a material. Further, the plate portion 155, the plate portion 165, and the plate portion 167 may be added not to the entire edge of the pad but to a part thereof.
  • the differential pressure sensor 110 using the piezoelectric element 118 is adopted to detect a weak vital signal such as a pulse wave, but a relatively large vibration such as body movement is adopted.
  • a weak vital signal such as a pulse wave
  • a relatively large vibration such as body movement
  • the sensitivity may be too high, and it may be difficult to distinguish between noise and body movement due to saturation.
  • a differential pressure sensor different from that in the first embodiment is adopted for the purpose of capturing a relatively large vibration such as body movement. More specifically, a differential pressure sensor such as a conventional capacitive differential pressure sensor, piezo resistance type differential pressure sensor, or differential transformer type differential pressure sensor may be adopted.
  • the capacitive differential pressure sensor is, for example, a first fixed pole provided on the first glass, a second fixed pole provided on the second glass, for example, a first glass and a second glass. It has, for example, a movable electrode of silicon provided between and, and is movable by the differential pressure between the first pressure applied from the first glass side and the second pressure applied from the second glass side.
  • a movable electrode of silicon provided between and, and is movable by the differential pressure between the first pressure applied from the first glass side and the second pressure applied from the second glass side.
  • the piezoresistive differential pressure sensor is a differential pressure sensor that utilizes the piezoresistive effect of gauge resistance formed by diffusion or ion injection on the surface of the silicon diaphragm, and converts changes in electrical resistance into electrical signals.
  • the differential transformer type differential pressure sensor is a differential pressure sensor that uses a displacement sensor with a differential transformer.
  • the displacement sensor is provided with secondary coils on both sides of the primary coil, and a metal core is slidably arranged in the center of the primary coil and the secondary coil.
  • a metal core is slidably arranged in the center of the primary coil and the secondary coil.
  • the core is configured to slide at the center of the primary coil and the secondary coil according to the differential pressure between the first pressure and the second pressure, the induction corresponding to the displacement of the core is provided.
  • the differential pressure is detected as the difference in voltage.
  • a differential transformer type displacement sensor is also disclosed in, for example, JP-A-9-113203 and JP-A-6-77065, and is well known.
  • FIGS. 69 and 71 show measurement results while the vehicle is running at a speed of 50 km / h by adopting a capacitance type differential pressure sensor.
  • the vertical axis represents the amplitude [V] and the horizontal axis represents the time [s].
  • the pad arrangement is as shown in FIG. 34, for example.
  • FIG. 69 shows a measurement result when the first pad 150 closer to the human body is connected to the capacitive differential pressure sensor 1110 via the tube 130, but the second pad 160 and the tube Reference numeral 140 is a measurement result when the differential pressure is removed and the second connection portion 1122 of the capacitive differential pressure sensor 1112 is sealed so that the differential pressure cannot be detected. If the sensor is not functioned as a differential pressure sensor in this way, partial saturation will occur, and the body movement cannot be detected because it is buried in noise.
  • FIG. 71 shows a measurement result when the second pad 160 is connected to the capacitive differential pressure sensor 1110 via the tube 140. With such a configuration, even if the capacitive differential pressure sensor 1110 is adopted, vibration based on body movement can be detected in the portion indicated by the arrow.
  • the output unit 2214 included in the signal processing device 2210 is a short-range wireless communication device (for example, a communication device according to a standard such as Bluetooth (registered trademark)) and the measuring device 100 is mounted on a vehicle such as an automobile, FIG. As schematically shown in 72, the measurement result of the measuring device is transmitted from the signal processing device 2210 included in the sensor unit 220 to the mobile terminal 8000 such as a smartphone, transmitted to the car navigation system 8100, or another. It may be transmitted to the in-vehicle unit 8200.
  • the mobile terminal 8000 such as a smartphone
  • the car navigation system 8100 or another. It may be transmitted to the in-vehicle unit 8200.
  • a mobile terminal 8000 such as a smartphone may display a measurement result or a further analysis result to provide information such as a health condition to the user. Similarly, in the car navigation system 8100, the measurement result or the further analysis result may be displayed. Further, the vehicle-mounted unit 8200 may display the measurement result or the further analysis result, and control the vehicle or the like based on them.
  • the mobile terminal 8000 may be a wearable device such as a smart watch or smart glasses.
  • FIG. 72 shows an example of transmitting the measurement result to another device by wireless communication, it may be connected to the car navigation system 8100 or the in-vehicle unit 8200 by wire.
  • a USB (Universal Serial Bus) connector or the like may be provided on the sensor unit 220 or the like to connect to a mobile terminal 8000 such as a smartphone with a USB cable.
  • the measuring device 100 may be embedded in the seat cushion 4000, but also the measuring device 100 may be mounted in another cushion laid on the seat cushion 4000. By doing so, even if the cushion is attached later, it becomes possible to measure with the measuring device 100 according to the present embodiment.
  • the cushion may be charged with a built-in rechargeable battery to supply electric power to the measuring device 100, or electric power may be supplied from the automobile side by a cable or the like.
  • the output of the measurement result may be wireless or wired.
  • it can be mounted not only on automobile seats but also on wheelchairs and other seats. Furthermore, it can be applied to mobile beds and the like. In addition, if it is mounted in a movable cushion instead of the fixed seat cushion 4000 described above, it can be used in various situations. Furthermore, it was shown that it is possible to detect vital signals and body movements, but by using a differential pressure sensor and the first and second pads (that is, air mats), large noise is canceled and a small desired signal can be obtained. It can also be applied to weak low-frequency vibration monitoring of buildings such as bridges and buildings, and weak low-frequency vibration monitoring from conveyors and motors used in production equipment.
  • the present invention is not limited thereto.
  • the functional configuration example is an example, and it is sufficient that the same function can be realized as a whole even if the device configurations are different.
  • Some functions of the processing unit 2212 of the signal processing device 2210 may be realized by a program executed by the microprocessor, or may be implemented entirely by a dedicated circuit.
  • the above shows an example of extracting vital signals mainly from the back of the legs of the human body, but vital signals may be extracted from other parts of the human body.
  • vital signals may be extracted from other parts of the human body.
  • the first pad 150 and the second pad can be arranged near the artery, it becomes easier to extract vital signals.
  • air as a fluid
  • another gas or liquid may be used.
  • it is a body movement, it can be detected from various parts of the human body.
  • the measuring device includes (A) a first bag-shaped member that receives the first vibration, and (B) a second bag-shaped member that receives the second vibration. C) The first space communicating with the first bag-shaped member, the second space communicating with the second bag-shaped member, the first space and the second space are separated, and the piezoelectric body is formed. It has a differential pressure sensor with a vibrating membrane.
  • the differential pressure between the first pressure due to the first vibration input via the first bag-shaped member and the second pressure due to the second vibration input via the second bag-shaped member is appropriate.
  • the signal corresponding to the vibration of is output as an electric signal by the piezoelectric body. This makes it possible to avoid the saturation of the output signal caused by noise.
  • the measuring device includes (D) a first tube connecting between the first bag-shaped member and the first space of the differential pressure sensor, and (E) the second bag-shaped member and the differential pressure sensor. It may further have a second tube connecting the second space.
  • the differential pressure sensor can be arranged at a position away from the first and second bag-shaped members.
  • the internal volume of the first bag-shaped member and the first space (including the internal volume of the tube if there is a tube) and the internal volume of the second bag-shaped member and the second space (the tube is included). In some cases, it may be the same as (including the internal volume of the tube), and in some cases, it may be different.
  • differential pressure sensor described above may further have an amplifier for the output signal of the piezoelectric body. This contributes to the miniaturization of the measuring device.
  • the position of the first bag-shaped member and the second bag-shaped member may be restricted so as to be arranged in an overlapping manner. This is a more preferable configuration for measuring vital signals. That is, it is effective in canceling noise. If the bag-shaped member has a flat plate shape, it is easier to receive vibration, and if it is stacked, it can be arranged in a small space. Further, if it is installed on a seat cushion or the like, it becomes easy to apply the same load to both.
  • a separating material for providing a predetermined separation distance between the first bag-shaped member and the second bag-shaped member may be further provided. good. This is to adjust the separation distance according to the environment.
  • the first bag-shaped member may be arranged closer to the object to be measured than the second bag-shaped member. This is because the first bag-shaped member receives more vital signals.
  • the measuring device may further have (F) a signal processing unit that processes the signal from the differential pressure sensor, and (G) an output unit that outputs the output signal of the signal processing unit to an external device. Having such a configuration makes it possible to appropriately extract minute signals such as vital signals.
  • the differential pressure sensor including the piezoelectric body
  • the differential pressure sensor including MEMS Micro Electro Mechanical Systems
  • the vehicle seat according to the present embodiment has (A) a first bag-shaped member (may be a fluid inclusion body in which a fluid is sealed) and a second bag-shaped member (a fluid is contained). It may be a fluid inclusion body in an enclosed state), a first space communicating with the first bag-shaped member, a second space communicating with the second bag-shaped member, and a first space. It has a differential pressure sensor that separates the second space from the second space and has a vibrating membrane on which a piezoelectric body is formed. Then, the first bag-shaped member is arranged so as to be overlapped with each other so as to be closer to the predetermined portion of the human body than the second bag-shaped member inside the portion where the predetermined portion of the human body hits. By doing so, the vital signals of the person sitting on the vehicle seat can be appropriately extracted.
  • a first bag-shaped member may be a fluid inclusion body in which a fluid is sealed
  • a second bag-shaped member a fluid is contained
  • It may be a fluid inclusion body in
  • the part where the predetermined part of the human body hits is the seat part of the vehicle seat. However, it may be another part. Further, the first bag-shaped member and the second bag-shaped member may be laminated and provided in the resin material of the seat portion. Further, the portion of the human body to which a predetermined portion touches may be made of an effervescent resin.
  • the measuring device coincides with (A) the center of the first air mat that receives the first vibration and (B) the center of the first air mat when viewed in a plan view.
  • a second air mat that is laminated and laminated to receive the second vibration, (C) a first space that communicates with the first air mat, and a second space that communicates with the second air mat, ( D) It has a sensor that detects vibrations in the first space and the second space.
  • a laminate including the first air mat and the second air mat may be provided in the groove or recess that regulates the positions of the first air mat and the second air mat.
  • the groove or recess may be provided in the seat cushion or may be provided in the material of the seat cushion.
  • the sensor may be composed of a pressure sensor or a differential pressure sensor.
  • the first and second air mats may be laminated in close contact with each other.
  • the housing constituting the space by the inner wall and the space are divided into a first space and a second space, and the space is transmitted to the first space.
  • the vibrating membrane may be made of metal.
  • the housing is formed by resin molding, a removable upper lid is fitted in the upper part of the first space of the housing, and the electrical connection portion of the vibrating membrane is the surface of the vibrating membrane on the upper lid side. It may be provided in.
  • a third space may be provided below the second space, and circuit components of an analog amplifier may be provided.
  • Such a configuration is not limited to the matters described in the embodiment, and may be implemented by another configuration that has substantially the same effect.

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CN114557571A (zh) * 2022-03-23 2022-05-31 慕思健康睡眠股份有限公司 一种智能床垫和生理信息检测方法
US12226258B2 (en) 2022-10-11 2025-02-18 Biosense Webster (Israel) Ltd. Systems and methods for tracking an anatomical focal point

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JP2007061490A (ja) * 2005-09-01 2007-03-15 Honda Motor Co Ltd 乗員状態検出装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114557571A (zh) * 2022-03-23 2022-05-31 慕思健康睡眠股份有限公司 一种智能床垫和生理信息检测方法
CN114557571B (zh) * 2022-03-23 2023-11-14 慕思健康睡眠股份有限公司 一种智能床垫和生理信息检测方法
US12226258B2 (en) 2022-10-11 2025-02-18 Biosense Webster (Israel) Ltd. Systems and methods for tracking an anatomical focal point

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