JP2019195651A - Sheet - Google Patents

Abstract

To provide a sheet that can prevent disconnection of a conductor contained in an electrode part which constitutes a heartbeat sensor.SOLUTION: The sheet includes: a heartbeat sensor having an electrode part 11 that detects a potential signal corresponding to the cardiac potential of a seated person; and an arithmetic processing unit that performs arithmetic calculation for specifying consciousness level of the seated person by means of the potential signal obtained from the heartbeat sensor. The electrode part 11 is composed of a conductive sheet 11a and a plurality of conductors 11d. The plurality of conductors 11d include: a basic conductor 11da that is arranged along the periphery of the conductive sheet 11a; and a plurality of cross conductors 11db that intersect the basic conductor 11da. The plurality of cross conductors 11db are not intersected partially at one place but intersected at a distance.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a seat, and more particularly, to a seat having a function of measuring a heartbeat.

  2. Description of the Related Art In recent years, a configuration has been proposed in which abnormalities in physical condition are determined by detecting various parameters indicating the state of an occupant in order to quickly notify when an abnormal condition occurs in a vehicle occupant.

For example, in Patent Document 1, a heart rate sensor (same as the electrocardiographic sensor electrode described in the same document) disposed on the seat back and a ground electrode disposed on the seat cushion (same as the above). A vehicle seat provided with an electrocardiographic sensor in the literature is disclosed.
The heart rate sensor detects a potential signal from the seated person's heart as a parameter indicating the state of the occupant and monitors the health state.

Moreover, in patent document 2, a surface electrode group is provided in the position which contact | abuts a seated person's back, a waist | hip | lumbar part, a buttocks, and a thigh, and a biosignal is detected from the difference signal of the potential signal detected from each surface electrode group. An invention relating to a biological signal collecting apparatus is disclosed.
More specifically, this potential signal is a potential signal emitted from the vicinity of the heart or lung, and based on this, the biological signal collection device converts one of the plurality of surface electrodes to the neutral point potential of the amplifier. By acquiring the signal, signal noise is suppressed, and biological signals such as the heartbeat and breathing of the seated person are collected.

JP 2009-106673 A JP 2007-301175 A

By the way, when the vehicle is driven, the seat and the contact portion of the seated person are not constant due to the occurrence of shaking and the centrifugal force acting when driving on a curve.
Further, when the physique of the seated person is different, the point at which the biological signal can be suitably detected is different.
For this reason, it has been difficult to stably detect a biological signal from a seated person in the vehicle seat.
In particular, this problem has remarkably appeared when a detection target of a biological signal is provided by a sensor provided on the seat back. The reason for this is that the seat back contact portion with the seat occupant changes by swinging back and forth, left and right due to the shaking of the vehicle, and varies greatly depending on the physique of the seat occupant.
And since the heart rate sensor described in patent document 1 was provided with the heart rate sensor electrode only in the seat back, it was difficult for the said reason to detect an electrocardiogram signal suitably.

On the other hand, in the surface electrode group described in Patent Document 2, an arbitrary one of the surface electrodes is used as a ground electrode, a potential signal is acquired from the other two, and the potential signal relates to heartbeat and respiration. Therefore, it is possible to acquire a potential signal more stably than in Patent Document 1.
However, the surface electrode provided on the seat cushion is subject to a large weight of the seated person, so that the conductive wire disposed on the surface electrode may be disconnected.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a sheet capable of suitably detecting an electrocardiogram signal by suppressing disconnection of a conductive wire included in an electrode part constituting a heart rate sensor. And

  According to the seat of the present invention, the subject is a heart rate sensor having an electrode portion that detects a potential signal corresponding to the cardiac potential of the seated person, and the awareness of the seated person by the potential signal obtained from the heart rate sensor. An arithmetic processing unit that performs an operation for specifying a level, wherein the electrode portion is composed of a conductive sheet and a plurality of conductive wires, and the plurality of conductive wires are arranged around the conductive sheet. And a plurality of other parts intersecting with the part, and the plurality of other parts do not intersect with the part at one place, and are separated from each other. It is solved by crossing.

  According to the above configuration, a plurality of conductors can be prevented from being disconnected at once because a part of the conductor and the other part of the conductor do not intersect at one place, and an electrocardiogram signal can be suitably detected. Can do.

In addition, it is preferable that a cut portion is formed in the conductive sheet, and the plurality of conductive wires are arranged so as to extend toward the periphery of the cut portion.
According to the above configuration, since the cut portion is formed in the electrode portion of the heart rate sensor, wrinkles are prevented from occurring in the electrode portion and the bending load is reduced, so that the occurrence of disconnection of the conductive wire can be suppressed. it can.

In addition, the electrode portion includes a plurality of intersecting portions where the conducting wires intersect, and is elongated in one, and between the plurality of intersecting portions in the longitudinal direction of the electrode portion, It is preferable that a cut-out portion is formed.
According to the said structure, generation | occurrence | production of the disconnection in the crossing part of conducting wire can be suppressed because the bending load added to the crossing part of conducting wire can be reduced by the cutout part provided between the crossing parts.

In addition, the electrode portion is elongated in one side, and a cut portion is formed in the conductive sheet, and the cut portion extends in the long direction at the periphery of the electrode portion. It is preferable that a plurality of cut-out portions are formed on the side to be paired in the short direction, and a cut-out portion is formed between the cut-out portions forming the pair.
According to the above configuration, since the cutout portion is formed between the cut portions formed in pairs in the short direction, the bending load applied to the short direction of the electrode portion can be released by the cutout portion. The occurrence of disconnection can be suppressed.

In addition, the electrode portion extends long on one side, and a cut portion is formed in the conductive sheet, and the cut portion is formed in an intermediate portion on the short side of the electrode portion. It is preferable.
According to the above configuration, since the cut portion is formed, generation of wrinkles can be suppressed, so that the short side of the electrode portion can be lengthened, and the bending load is increased while forming a wide detection area of the electrode portion. The occurrence of disconnection can be suppressed by suppressing the influence of.

Moreover, it is preferable that the said conducting wire is extended from either of the four corners of the said electrode part.
Since the conducting wire is wired from the corner of the electrode part that is not easily affected by the bending load, occurrence of disconnection can be suppressed.

According to the present invention, it is possible to prevent a plurality of conductors from being disconnected together and to detect an electrocardiographic signal suitably.
Moreover, according to this invention, generation | occurrence | production of the disconnection of the conducting wire which comprises the electrode part of a heart rate sensor can be suppressed.
Moreover, according to this invention, generation | occurrence | production of the disconnection in the cross | intersection part of conducting wire can be suppressed.
Moreover, according to this invention, it can suppress that a conducting wire is disconnected by the bending load added to the elongate direction of an electrode part.
Moreover, according to this invention, generation | occurrence | production of the disconnection of an electrode part can be suppressed, making it possible to lengthen the short side of an electrode part.
Further, according to the present invention, it is possible to suppress the occurrence of disconnection by wiring the conducting wire from the corner of the electrode portion that is not easily affected by the bending load.

It is a perspective view showing the whole composition of the vehicular seat concerning this embodiment. (A) is a typical front view which shows a seat back provided with the electrode part which comprises a heart rate sensor, (B) is a typical top view which shows a seat cushion provided with a respiration sensor. It is an enlarged view which shows an electrode part. It is a figure which shows the IV-IV cross section of FIG. 3, and is sectional drawing of a part of electrode part. (A) is a conceptual diagram which shows the basic pattern of conducting wire, (B) is a conceptual diagram which shows the connection pattern which combined the basic pattern.

The present invention relates to a seat, and more particularly, to a seat having a function of stably measuring a heartbeat.
Embodiment described below is only an example for making an understanding of this invention easy, and does not limit this invention. That is, the shape, dimensions, arrangement, and the like of the members described below can be changed and improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof.
In the following description, it is assumed that the traveling direction of the vehicle is the forward direction, the reverse is the backward direction, and the height direction of the vehicle is the vertical direction.
Hereinafter, a vehicle seat S according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings.

First, the overall configuration of the vehicle seat S will be described with reference to FIGS. 1 and 2.
Here, FIG. 1 is a perspective view showing the overall configuration of the vehicle seat S according to the present embodiment, and FIG. 2A shows a seat back S1 including an electrode portion 11 and a conductive cloth 26 constituting the heart rate sensor 10. FIG. 2B is a schematic plan view showing the seat cushion S2 including the respiration sensor 9.
In FIG. 1 and FIG. 2, some components (for example, a conductive wire 11 d) constituting these components are omitted for easy understanding of the arrangement positions of the respiration sensor 9 and the heart rate sensor 10.
As shown in FIG. 1, the vehicle seat S includes a seat cushion S2 that is a part where the seated person sits, and a part that is rotatably attached to the rear part of the seat cushion S2, and is a part that hits the backrest of the seated person. A back S1, and a wakefulness maintaining device U that maintains the wakefulness of the seated person.

The seat back S1 includes a urethane cushion pad S1a and a skin material S1b provided to cover the cushion pad S1a.
Moreover, as shown in FIG.1 and FIG.2 (A), the electrode part 11 and the electrically conductive cloth 26 are arrange | positioned in the seat back S1 in the position facing a seated person's waist | hip | lumbar part.

The seat cushion S2 includes a urethane cushion pad S2a and a skin material S2b provided to cover the cushion pad S2a.
Moreover, as shown in FIG.1 and FIG.2 (B), in the seat cushion S2, the respiration sensor 9 is arrange | positioned in the position facing a seated person's buttocks.

1 and 2 show a configuration in which the respiration sensor 9, the electrode unit 11, and the conductive cloth 26 are arranged on the seating surface. On the other hand, these may be arranged between the cushion pad S1a and the skin material S1b or between the cushion pad S2a and the skin material S2b, and thus the appearance can be improved.
The respiration sensor 9, the heart rate sensor 10, the detection device 21, the arithmetic processing device 22, and the vibration device 23 constitute a wakefulness maintaining device U, and details will be described next.

<About the configuration of the arousal maintenance device>
The awakening maintenance device U will be described with reference to FIGS. 3 to 5 in addition to FIGS. 1 and 2.
Here, FIG. 3 is an enlarged view showing the electrode portion 11, FIG. 4 is a view showing a IV-IV cross section of FIG. 3, a partial cross-sectional view of the electrode portion 11, and FIG. FIG. 5B is a conceptual diagram showing a connection pattern 19 in which square portions 19a and 19b are combined.

  The wakefulness maintaining device U is a device for mainly maintaining the wakefulness of the seated person who is the driver, and as described above, the respiratory sensor 9, the heart rate sensor 10, the detection device 21, the arithmetic processing device 22, and the vibration device 23. Consists of

The respiration sensor 9 is a known pressure sensor, and detects a pressure signal that is a signal indicating a consciousness level that varies with the breathing of the seated person. For example, the respiration sensor 9 includes a piezo sensor type pressure sensor, a semiconductor piezo resistance type pressure sensor, a strain gauge type pressure sensor, a capacitance type pressure sensor, or a silicon resonant type pressure sensor.
The respiration sensor 9 in the example of the present embodiment is substantially M-shaped, and is disposed on the seat cushion S2 so that the open side faces rearward.

The heart rate sensor 10 detects an electrocardiographic signal which is an action potential signal generated along with the beat of the seated person's heart and a signal indicating a consciousness level, and is provided with a pair of electrodes 11 provided in the seat width direction. Consists of
Between the pair of electrode portions 11 in the sheet width direction, a strip-shaped conductive cloth 26 that is narrower than the electrode portions 11 and formed longer in the height direction is disposed.
The conductive cloth 26 is a conductive cloth partially containing a metal material, is connected to the body of the vehicle body, functions as a ground, and serves as a reference potential for removing the offset signal included in the signal of the electrode unit 11. The potential is acquired.

(About the electrode)
As shown in FIG. 3, the electrode portion 11 is formed in a sheet shape having a rectangular shape that is long in the vertical direction, and has an area of about 100 cm ² and a capacitance of about 3000 pF.
Moreover, the electrode part 11 is mainly comprised of the conductive sheet 11a, and is affixed on the cushion pad S1a of the seat back S1 by a double-sided tape 11ad affixed to the back surface of the conductive sheet 11a.

As shown in FIG. 4, the conductive sheet 11a includes a first resin film 11ac, a conductive wire 11d attached on the first resin film 11ac, and a second resin film 11ac attached to the first resin film 11ac so as to sandwich the conductive wire 11d. It has a laminated structure composed of a resin film 11ab and an ink 11aa applied to the second resin film 11ab.
In the present embodiment, the first resin film 11ac is made of PET (Poly Ethylene Terephthalate).

  The conducting wire 11d is made of silver. In addition, a part of the conductive sheet 11a including the conductive wire 11d protrudes from the rectangle and extends downward in the lower part of the electrode part 11 in the sheet width direction. It is connected with.

The terminal connecting member 11e is made of a conductive metal piece, one end of which is connected to the end of the conducting wire 11d, and the other end is connected to the end of the cable 11f.
The cable 11f is connected to a detection device 21 described later.
The second resin film 11ab is made of a carbon resin.
The ink 11aa is a metal ink containing BaTiO3 (barium titanate).

In the present embodiment, a total of six cut portions 11b are formed in the conductive sheet 11a, one at the center of the upper and lower edges and two at the left and right edges at intervals in the vertical direction. The cut portion 11b has a semicircular hole shape with an arcuate edge.
Also, between the two left and right cut portions 11b formed on the left and right edges of the conductive sheet 11a and between the three intersecting portions 11h above and below the intersecting conducting wire 11db described later, One long hole cutout portion 11c extending in the direction is formed. The cutout portion 11c is formed to be longer than the cutout portion 11b and has a long hole shape with arc-shaped end edges.
Thus, by forming the cutout part 11c between each of the three crossing parts 11h, the bending load applied to the crossing part 11h can be reduced by the cutout part 11c, and the conductive wire 11d becomes the crossing part 11h. It is possible to suppress disconnection at.
Further, since the bending load in the sheet width direction (short direction) can be released by the two cut portions 11b provided on the upper and lower sides, the electrode 11 is formed long in the sheet width direction and the disconnection of the conductive wire 11d is prevented. can do.

The conducting wire 11d is composed of a basic conducting wire 11da disposed along the outer periphery of the electrode portion 11 and a cross conducting wire 11db extending so as to intersect inside the basic conducting wire 11da.
Specifically, the cross conducting wire 11db connects the four corner portions of the basic conducting wire 11da and the portion along the notch 11b formed on the outer periphery of the electrode portion 11 extending in the sheet vertical direction (longitudinal direction). It is stretched like so.
In particular, in the cross conducting wire 11db, two cross conducting wires 11db extend toward the basic conducting wire 11da along the cut portions 11b formed on both sides in the sheet width direction (short direction), and they are connected at different positions. It is arranged so that.

As described above, since the cut portion 11b and the cutout portion 11c are formed, the stress applied to the electrode portion 11 as the skin material S1b is bent is dispersed by the cutout portion 11b and the cutout portion 11c. . By dispersing the stress in this manner, it is possible to suppress the electrode portion 11 from being locally bent at an acute angle and to prevent wrinkles from being generated in the electrode portion 11.
When the skin material S1b is bent by the cut portion 11b and the cutout portion 11c, the electrode portion 11 bends along the skin material S1b without generating wrinkles. It is possible to limit the concentration of stress, and it is possible to prevent the conducting wire 11d from being disconnected.

The conducting wire 11d is stretched in a planar shape so as to intersect the inside of the conductive sheet 11a, and two or less conducting wires 11d intersect at the intersection, and three or more conducting wires 11d do not intersect.
As described above, since the number of the conductive wires 11d intersecting at the intersection of the conductive wires 11d is suppressed to two or less, it is possible to dispose the conductive wires 11d in a planar shape on the conductive sheet 11a, and the influence when the wire is disconnected. Can be limited.

(About wiring pattern)
Here, the wiring pattern of the conductive wire 11d will be described with reference to FIG.
The basic pattern 18 shown in FIG. 5A extends from the four corners of the basic conductor 18a to the opposite corners of a frame-like (square shape in this example) basic conductor 18a formed along the outer periphery of each electrode portion. And intersecting conductors 18b intersecting each other.
Since the cross conducting wire 18b extends from the four corners of the basic conducting wire 18a which is highly rigid and hardly affected by the bending load, the occurrence of disconnection is suppressed.
In addition, the basic pattern 18 will be formed along the inner side of the edge of a notch, when the cut is formed in the electrically conductive sheet.

The connection pattern 19 shown in FIG. 5B has a shape in which two basic patterns 18 are adjacently connected. Specifically, the square portions 19a and 19b are connected to each other, and the connection portion 19c is connected to the connection portion 19c. The basic conductor 18a (basic conductors 19aa and 19ba described later) is not disposed.
Here, the rectangular portion 19a includes a basic conducting wire 19aa provided on the outer periphery of the square other than the side adjacent to the rectangular portion 19b, and a cross conducting wire 19ab extending so as to intersect the inside of the basic conducting wire 19aa. It is configured.
Similarly, the rectangular portion 19b includes a basic conducting wire 19ba provided on the outer periphery of the square other than the side adjacent to the rectangular portion 19a, and a cross conducting wire 19bb extending so as to intersect the inside of the basic conducting wire 19ba. It is configured.
That is, as shown in the connection pattern 19, each electrode part is provided so that a plurality of basic patterns 18 are provided side by side, and the basic conductor 18a is not provided in the connection part 19c.
Thus, by comprising, a conducting wire can be arrange | positioned uniformly in an electrode part, and it becomes possible to save expensive silver which is a material of conducting wire by not providing a conducting wire in the connection part 19c.

(About other configurations)
The detection device 21 shown in FIG. 1 detects a biological signal related to an electrocardiogram signal from the potential signal detected by the electrode unit 11 and the reference potential supplied from the conductive cloth 26, and breathes from the pressure signal obtained from the respiration sensor 9. It detects a biological signal related to the signal, and includes a ferrite core (not shown), a common mode noise filter, an operational amplifier, and the like.
The ferrite core and the common mode noise filter are attached to the DC power supply line and have a function of removing conduction noise.

  The arithmetic processing unit 22 determines that the arousal level (consciousness level) of the seated person is reduced by comparing the respiratory signal and the electrocardiogram signal related to the biological signal detected by the detection device 21 with respective predetermined reference values. In such a case, a drive signal is transmitted to the vibration device 23.

  The vibration device 23 is a device including a so-called “vibration motor” made of a known unbalanced mass motor, and drives the vibration motor for a predetermined time in accordance with a drive signal received from the arithmetic processing device 22 to vibrate the seated person. Is granted. For example, the vibration device 23 is provided inside the seat back S1.

The heart rate sensor 10 of the vehicle seat S according to the present embodiment is provided with the seat back S1 and an electrical noise other than the electrocardiogram signal in order to compare the potential signals detected from the pair of electrode portions 11 close to the heart. It is possible to reduce the probability of being added.
In addition, you may make it provide the electrode part 11 of the heart rate sensor 10 in seat cushion S2.

Furthermore, since the respiration sensor 9 provided on the back side of the seat cushion S2 is disposed at a portion facing the buttocks of the seated person, the contact between the breathing sensor 9 and the seated person is easily maintained and stable. It is possible to detect a respiratory signal.
And the arithmetic processing unit 22 can use the signals detected from the respiration sensor 9 and the heart rate sensor 10 together to determine the awakening state of the seated person, thereby further improving the determination accuracy.

  In the above embodiment, the vibration device has been described as an example of the wakefulness maintaining device, but the present invention is not limited to such a configuration. For example, by using a display, light or buzzer provided in the car, it is possible to notify the seat occupant or passenger by video, light, sound, etc., and to maintain the wake up of the seat occupant directly or indirectly Also good.

  Furthermore, in the said embodiment, although demonstrated using the vehicle seat as an example, this invention is not limited to such a structure, It applies to the sheet | seat used for industrial equipment, an airplane, a ship, or other uses. Is possible.

S Vehicle Seat S1 Seat Back S1a Cushion Pad S1b Skin Material S2 Seat Cushion S2a Cushion Pad S2b Skin Material U Arousal Maintenance Device 9 Respiration Sensor 10 Heart Rate Sensor 11 Electrode 11a Conductive Sheet 11aa Ink 11ab Second Resin Film 11ac First Resin Film 11ad Double-sided tape 11b Notch 11c Notch 11d Conductor 11da Basic conductor (part)
11db cross conductor (other parts)
11e terminal connecting member 11f cable 11h crossing 18 basic pattern 18a basic conducting wire 18b crossing conducting wire 19 connecting pattern 19a, 19b rectangular part
19aa, 19ba Basic conductor
19ab, 19bb cross conductor
19c Connecting part 21 Detection device 22 Arithmetic processing device 23 Vibration device 26 Conductive cloth

Claims (6)

A heart rate sensor having an electrode portion for detecting a potential signal corresponding to the cardiac potential of the seated person;
An arithmetic processing unit that performs an operation for specifying the consciousness level of the seated person based on the potential signal obtained from the heart rate sensor,
The electrode part is composed of a conductive sheet and a plurality of conductive wires,
The plurality of conductors includes a part disposed along the periphery of the conductive sheet, and a plurality of other parts intersecting the part.
The sheet is characterized in that the plurality of other parts do not intersect the part at one place but intersect at a distant position. The conductive sheet has a cut portion,
The sheet according to claim 1, wherein the plurality of conductive wires are arranged so as to extend toward the periphery of the cut portion. The electrode portion includes a plurality of intersecting portions where the conducting wires intersect, and is elongated in one side,
The sheet according to claim 1 or 2, wherein a cutout portion is formed between the plurality of intersecting portions in the longitudinal direction of the electrode portion. The electrode portion extends long on one side,
The conductive sheet has a cut portion,
A plurality of the cut portions are formed on the side extending in the long direction at the periphery of the electrode portion so as to form a pair in the short direction,
The sheet according to any one of claims 1 to 3, wherein a cutout portion is formed between the pair of cutout portions. The electrode portion extends long on one side,
The conductive sheet has a cut portion,
The sheet according to any one of claims 1 to 4, wherein the cut portion is formed in an intermediate portion on a short side of the electrode portion.   The sheet according to any one of claims 1 to 5, wherein the conductive wire extends from any one of four corners of the electrode portion.

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