JP6523738B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat and relates to a vehicle seat having a function of measuring a heartbeat.

  In recent years, in order to quickly notify when a physical condition abnormality of a vehicle occupant occurs, a configuration has been proposed in which a physical condition abnormality is determined by detecting various parameters indicating the condition of the passenger.

As a configuration for detecting a cardiac potential related to a heartbeat of a seated occupant who is a passenger, a configuration in which an electrode is provided inside a seat, in other words, on the back side of a skin material is known (for example, Patent Document 1).
In such a case, the accuracy of the heart rate sensor may be lowered because the potential detected by the electrode is reduced by the thickness of the skin material.

  It is provided on the back surface of the skin material from the skin material having conductivity in Patent Document 2 as a configuration capable of preventing such a decrease in potential via a conductive cloth (described as a conductive member in the same document). A technique is disclosed for applying a current to the electrode layer.

Unexamined-Japanese-Patent No. 2009-106673 JP 2012-20002 A

  However, when the conductive cloth disclosed in Patent Document 2 is provided on the vehicle seat, the load is applied from the seated person to the conductive cloth via the surface material during driving, and the conductive cloth is broken due to use over time. In some cases, the potential can not be detected from the electrode layer.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat provided with a capacitance type sensor capable of stably detecting a seated person's cardiac potential.

  According to the vehicle seat relating to the present invention, the subject is a capacitive sensor having a seat cover and an electrode part provided on the back side of the seat cover for detecting a heartbeat of a seated person, and the capacitance A conductive sheet having a folded portion connected to the electrode portion of the sensor and being folded back from the front side of the seat to the back side of the seat, and the folded portion is a seat of the vehicle seat It is solved by being arrange | positioned in the position which avoided the side part of width direction outer side.

According to the above configuration, the folded portion is disposed at a position avoiding the side portion in the seat width direction outer side of the vehicle seat to which a load from the seat occupant is likely to be applied. It becomes less susceptible to the tensile force of the sheet skin that occurs in the direction.
For this reason, it is possible to stably detect the cardiac potential of the seated person by the capacitance type sensor by suppressing the disconnection of the folded portion due to the tensile force.

Preferably, the folded back portion is formed by being folded back from the portion extending in the sheet width direction to the front side of the sheet skin and the back side of the sheet skin.
According to the above configuration, in the portion extending in the seat width direction, the amount of displacement of the seat cover by the tensile force of the seat occupant caused by the load of the seated person is small, so disconnection of the folded portion can be suppressed.

Furthermore, it is preferable that the folded-back portion be disposed on the center side in the sheet width direction than the bank portions provided on both sides of the seat cushion and the seat width direction of the seat back.
According to the above configuration, the folded-back portion is disposed on the center side in the sheet width direction with respect to the bank portion where the amount of displacement due to the load of the seated person is large. It is possible to prevent the disconnection of the folded portion by avoiding the application of a large tensile force to the

Further, it is preferable that the capacitance type sensor is formed in a long shape, and the conductive cloth is connected to a short portion of the capacitance type sensor.
According to the above configuration, by connecting the conductive cloth to the short portion of the capacitance type sensor, the conductive cloth can be made compact as compared with the case where the conductive cloth is connected to the long portion.

Furthermore, the conductive cloth is preferably connected to the shortest side of the detection surface of the capacitive sensor.
According to the above configuration, the conductive cloth is connected to the shortest side of the detection surface of the capacitive sensor, so the conductive cloth can be made compact compared to the case where the conductive cloth is connected to the long side of the detection surface. can do.

Preferably, the folded back portion is fixed to the hanging portion of the seat cover.
According to the above configuration, since the folded back portion is fixed to the hanging portion, positional displacement of the conductive cloth can be prevented.

According to the present invention, it is possible to provide a vehicle seat capable of stably detecting a seated person's cardiac potential by a capacitance type sensor.
Further, by providing the folded portion at a portion extending in the sheet width direction in which the displacement amount of the sheet skin due to the tensile force is small, it is possible to suppress the breakage of the folded portion.
Moreover, compared with the case where it arrange | positions to a bank part, it can avoid that big tensile force is added to a return part from a sheet | seat, and the disconnection of a return part can be suppressed.
In addition, the conductive cloth can be made compact by being connected to the short portion of the capacitance type sensor.
Further, the conductive cloth can be made compact by being connected to the shortest side of the detection surface of the capacitance type sensor.
Further, since the folded back portion is fixed to the hanging portion, the positional deviation of the conductive cloth can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the whole structure of the vehicle seat which concerns on this embodiment. It is a front view showing a seat back. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2 and is a side cross-sectional view of the seat back.

The present invention relates to a vehicle seat, and more particularly, to a capacitive sensor capable of stably detecting cardiac potential.
The embodiments described below are merely examples for facilitating the understanding of the present invention, and do not limit the present invention. That is, the shapes, sizes, arrangements, etc. of members described below can be modified or improved without departing from the scope of the present invention, and it is a matter of course that the present invention includes the equivalents thereof.
In the following description, the traveling direction of the vehicle is referred to as the forward direction, the opposite is referred to as the backward direction, and the height direction of the vehicle is referred to as the vertical direction.
Hereinafter, a vehicle seat S according to an embodiment of the present invention will be specifically described with reference to the attached drawings.

First, the overall configuration of the vehicle seat S and the conductive cloths 31a, 31b, and 31e provided on the seat back S1 will be described with reference to FIGS.
Here, FIG. 1 is a perspective view showing an entire configuration of a vehicle seat S according to the present embodiment, FIG. 2 is a front view showing a seat back S1, and FIG. 3 is a view showing a III-III cross section of FIG. It is side sectional drawing of seat back S1.
As shown in FIG. 1, the vehicle seat S includes a seat cushion S2 which is a sitting portion of the seated person, a seat back S1 which is attached to a rear portion of the seat cushion S2 and which is a backrest of the seated person, And an awakening maintenance device U for maintaining the awakening.

The seat back S1 includes a urethane cushion pad S1a and a skin material S1b provided to cover the cushion pad S1a. The skin material S1b is composed of a skin 40a and a wadding 40b attached to the back surface of the skin 40a (see FIG. 3).
In the seat back S1, a bank portion 39 is provided which is provided on both sides in the sheet width direction and is raised in the forward direction.
Furthermore, as shown in FIG. 3, the seatback S1 is at the center in the sheet width direction excluding the bank portion 39, on the back side of the skin material S1b, and between the cushion pads S1a. An upper electrode portion 11a and a lower electrode portion 11b that constitute 10 are provided.

The upper electrode portion 11a and the lower electrode portion 11b are attached to the seat back S1 in a direction in which the length in the sheet width direction is shorter than the length in the vertical direction.
And electrically conductive cloth 31a, 31b is connected to the short part of each of the upper electrode part 11a and the lower electrode part 11b in the back surface side of skin material S1b.
The conductive cloths 31a and 31b are attached so that a part of the conductive cloths 31a and 31b is exposed on the surface of the surface material S1b, have a width of about 65 mm, and are formed in pairs at a center distance of about 100 mm in the sheet width direction center There is. The conductive cloths 31a and 31b provided in a pair are respectively connected to the upper electrode portion 11a and the lower electrode portion 11b provided in a pair, and are energized.

As described above, since the conductive cloths 31a and 31b are attached to the short parts of the upper electrode part 11a and the lower electrode part 11b, the attachment to the respective electrode parts is made as compared with the case where the conductive cloths 31a and 31b are attached to the long parts. The width required for the conductive cloths 31a and 31b may be small. As a result, the conductive cloths 31a and 31b can be made compact.
Furthermore, focusing on making the conductive cloths 31a and 31b thin and compact, each of the conductive cloths 31a and 31b is connected to the shortest side portion in each of the detection surfaces of the upper electrode portion 11a and the lower electrode portion 11b. You should do it.

Further, the seat back S1 is connected to the body of a vehicle body (not shown), and the conductive cloth 31e functioning as a ground is between the conductive cloth 31a and the conductive cloth 31b in the sheet width direction and the center of the seat back S1. Provided in
The conductive cloth 31e has a width of about 20 mm, extends from the lower end of the seat back S1 to a position higher than the conductive cloth 31b, and an offset included in the signals from the upper electrode portion 11a and the lower electrode portion 11b. A potential to be a reference potential when removing a signal is acquired.

The seat cushion S2 includes a urethane cushion pad S2a and a skin material S2b provided to cover the cushion pad S2a. Further, inside the seat cushion S2, a detection device 21 and an arithmetic processing device 22 which constitute the awakening maintaining device U are provided together with the upper electrode portion 11a, the lower electrode portion 11b and a vibration device (not shown).
The detection device 21 detects a biosignal relating to an electrocardiogram signal from the potential signal detected by the upper electrode portion 11a and the lower electrode portion 11b, and comprises a ferrite core, a common mode noise filter, an operational amplifier, etc. ing.
The ferrite core and the common mode noise filter are attached to the DC power supply line, and have a function of removing conducted noise.
Arithmetic processing unit 22 separates the electrocardiogram signal from the biological signal detected by detection unit 21 and compares it with each predetermined reference value, and determines that the awakening degree (consciousness level) of the seated person is lowered. In this case, the drive signal is transmitted to a vibration device (not shown). Then, the vibration device applies vibration stimulation to the seated person, whereby the awakened state of the seated person is maintained.

Next, functions of the conductive cloth 31a and the conductive cloth 31b, and attachment of the conductive cloth 31a and the conductive cloth 31b to the surface material S1b will be described.
The conductive cloth 31a is connected to the upper electrode portion 11a, and the conductive cloth 31b is connected to the lower electrode portion 11b. For this reason, the cardiac potential of the seated person is detected by each of the upper electrode portion 11a and the lower electrode portion 11b without causing a decrease in the potential due to passing through the skin material S1b.
And the electric potential detected by the upper electrode part 11a and the lower electrode part 11b is transmitted to the detection apparatus 21 via the cable 11f.

The cushion pad S1a is divided into an upper pad 38a, a middle pad 38b and a lower pad 38c by a hanging groove 45a at the center in the seat width direction of the seatback S1 excluding the bank portion 39. Here, the hanging groove 45 a corresponds to the “portion extending in the sheet width direction” according to the present invention.
Similarly, among the skin materials S1b provided on the seat back S1, the skin material S1b at the center in the sheet width direction is an upper skin material 37a covering the upper pad 38a, the middle pad 38b and the lower pad 38c, and the middle skin material It is divided into upper and lower parts 37b and a lower skin material 37c.

The upper skin material 37a, the middle skin material 37b and the lower skin material 37c are attached with their ends accommodated in the hanging grooves 45a provided in the cushion pad S1a.
Specifically, a wire 43 suspended in the sheet width direction is attached in the hanging groove 45a. The skin material S1b is attached to the seat back S1 by engaging the J-shaped hook 44 attached to the wire 43 with the suture portion 42b at the end of the skin material S1b.

The conductive cloth 31a is formed in a strip shape so as to extend long in the sheet height direction, and is a folded back portion which is folded over the lower end of the middle skin material 37b between the front and back surfaces of the middle skin material 37b. It has 35a in the part attached to the hanging groove 45a.
The folded back portion 35a of the conductive cloth 31a is sewn together with the lower end of the middle skin material 37b and the upper end of the lower skin material 37c by the seaming portion 42b, and the hook 44 corresponding to the hanging portion according to the present invention It is fixed to
As described above, since the folded back portion 35a which is likely to cause partial positional deviation with the surface material S1b is fixed by the hook 44, positional deviation of the conductive cloth 31a can be suitably prevented.
Furthermore, in the conductive cloth 31a, upper end portions on both sides of the front and back surfaces of the middle skin material 37b are also sewn to the middle skin material 37b by the sewing portion 42a.

The conductive cloth 31b is formed in a strip shape so as to extend long in the sheet height direction, and at the lower end portion of the seat back S1, the end of the lower skin material 37c is provided on the front and back surfaces of the lower skin material 37c. It has a folded back portion 35b that is folded back across. Here, the lower end portion of the seat back S1 corresponds to the “portion extending in the sheet width direction” according to the present invention.
The upper end located on both sides of the front and back surfaces of the lower skin material 37c of the conductive cloth 31b is sewn to the lower skin material 37c by the stitching portion 42a.
As described above, the conductive cloths 31a and 31b are folded back and attached at the lower end portions of the hanging groove 45a extending in the sheet width direction and the seat back S1, making it difficult for the seated person to touch, and Since little tensile force is applied, the seatback S1 can be stably attached.

Then, the folded portions 35a and 35b are disposed so as to avoid the side surface in the seat width direction of the vehicle seat S to which the tensile load is largely applied by the seated person turning, so that the tensile load applied to the folded portions 35a and 35b Can be made smaller.
In particular, since the folded back portions 35a and 35b are provided on the center side in the seat width direction excluding the bank portion 39, the folded back portion 35a is also brought about when the seated person abuts on the bank portion 39 by the lateral swing of the vehicle. , 35b can be extremely reduced.
Therefore, the attachment state of the conductive cloth 31a and the conductive cloth 31b to the seat back S1 can be stably maintained, and disconnection of the conductive cloth 31a and the conductive cloth 31b can be restricted.

In the above embodiment, although the configuration in which the conductive cloth is disposed on the seat back has been described, the present invention is not limited to such a configuration, and can be applied to a configuration in which the conductive cloth is disposed on the seat cushion. It is.
Further, although the conductive cloth has been described in the above embodiment, any metal conductor having conductivity which can conduct electricity to the electrodes may be used, and conductive fibers sewn in a skin material may be used.
Furthermore, the number of electrodes, the number of hanging grooves, the number of conductive cloths, and the like in the above embodiment are arbitrary according to the sheet shape.

  In the above embodiment, the vibration device has been described as an example of the awakening maintaining device, but the present invention is not limited to such a configuration. For example, using a display, a light or a buzzer provided in the car, the seating person or the passenger is notified by video, light, or sound, and the seating person's awakening is maintained directly or indirectly. It is also good.

S Vehicle seat S1 Seatback S1a Cushion pad S1b Skin material (seat skin)
S2 Seat cushion S2a Cushion pad S2b Skin material U Awakening maintenance device 10 Heart rate sensor 11a Upper electrode portion 11b Lower electrode portion 11f Cable 21 Detection device 22 Arithmetic processing device 31a, 31b, 31e Conductive cloth 35a, 35b Folded portion 37a Upper surface material 37b Middle surface material 37c Lower surface material 38a Upper pad 38b Middle pad 38c Lower pad 39 Bank 40a Skin 40b Wadding 42a, 42b Suture 43 Wire 44 Hook (Sling)
45a hanging groove

Claims (6)

With the seat skin,
A capacitance type sensor provided on the back side of the seat cover and having an electrode unit for detecting a heartbeat of a seated person;
And a conductive cloth having a folded portion connected to the electrode portion of the capacitive sensor and folded back from the front side of the seat to the rear side of the seat,
The vehicle seat according to claim 1, wherein the folded back portion is disposed at a position avoiding a side surface portion of the vehicle seat in the seat width direction.   The vehicle seat according to claim 1, wherein the folded back portion is formed by being folded back from the portion extending in the seat width direction to the front surface side of the seat skin and the rear side of the seat skin.   The vehicle seat according to claim 1 or 2, wherein the folded back portion is disposed on the center side in the seat width direction with respect to a bank portion provided on both sides in the seat width direction of the seat cushion and the seat back. The capacitance sensor is formed in a long shape,
The vehicle seat according to any one of claims 1 to 3, wherein the conductive cloth is connected to a short portion of the capacitance type sensor.   The vehicle seat according to any one of claims 1 to 4, wherein the conductive cloth is connected to the shortest side of the detection surface of the capacitance type sensor.   The vehicle seat according to any one of claims 1 to 5, wherein the folded back portion is fixed to a hanging portion of the seat cover.

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