SEAT EQUIPPED WITH SENSORS

Abstract

A seat (1) equipped with a sensor (3), consisting of: an installation element (11) having an installation seat surface (11a); a seat cushion (10) which is a seat cushion attached to the installation seat surface of the installation member, and comprising: a first cushion (12) having a concave receiving portion (80) open to one side of the installation member in a back pressure receiving surface (12b) located on a back side of a pressure receiving surface (12a) that receives a pressure from a seated person; and a second cushion (15) accommodated in the concave receiving portion (80) of the first cushion (12) to be layered on the first cushion (12); and a sensor (3) arranged between a first pressure surface (82b) located on a side opposite to a direction in which the concave receiving portion of the first cushion (12) is open in the concave receiving portion and a second pressure surface (15a) located on a side opposite to the installation member in the second cushion (15), and which detects a sitting state of the seated person or biological information of the seated person by detecting a physical quantity in accordance with a pressure transmitted from the pressure receiving surface of the seat cushion (10) via the first cushion (12) in the sitting state by the seated person, and which has a flexible property, wherein the seat cushion (10) is installed on the installation seat surface of the installation member, and in a non-seated state, before the seated person sits on the seat cushion (10), the first cushion (12) and the second cushion (15) are pre-compressed in a layering direction in which the first cushion (12) and the second cushion (15) are layered, and the sensor (3) is subjected to pre-compression by a compression reaction force of the first cushion (12) and the second cushion (15).

Description

Technical area

[0001] The disclosure relates to a seat equipped with sensors. State of the art

[0002] Patent Document 1 discloses a configuration in which a sensor is arranged in a seat and a sitting state (sitting posture, etc.) of a seated person or biological information (respiration, pulse, heartbeats, etc.) of the seated person is obtained. In Patent Document 1, the sensor is arranged to be sandwiched between a seat frame and a seat cushion in a state where it is attached to the seat frame. The sensor detects, for example, a displacement of the body surface that occurs along with a pulse or respiration of the seated person by radiating electromagnetic waves upward (toward the seated person who is sitting) at a predetermined irradiation angle with respect to the horizontal direction and receiving and detecting reflected waves therefrom. Prior art document(s)Patent document(s)

[0003] Patent Document 1: Japanese Patent JP 6 409 466 B2. Further prior art documents include JP 2020 - 174 692 A, US 6 428 095 B1, JP 2005 - 199 936 A, and DE 10 2019 123 159 A1. Summary of the inventionProblem to be solved by the invention

[0004] One possible sensor could be a pressure sensor that detects the pressure exerted on the seat when the person sitting down.

[0005] However, when the pressure sensor is attached to the seat frame, there is a problem that the strength of the biological signal of the seated person decreases as the distance between the seated person's buttocks and the sensor increases.

[0006] If the sensor is mounted on the frame, there is also the problem that the vibration noise of the vehicle is transmitted directly to the sensor.

[0007] The disclosure has been made in view of the above and provides a seat equipped with sensors in which the strength of a biological signal being detected is increased and the noise is reduced. Means of solving the problem

[0008] One aspect of the disclosure provides a sensor-equipped seat. The sensor-equipped seat includes: an installation member having an installation seat surface; a seat cushion, which is a seat cushion installed on the installation seat surface of the installation member and includes: a first cushion having a concave receiving portion open to one side of the installation member in a back pressure receiving surface located on a back side of a pressure receiving surface that receives pressure from a seated person; and a second cushion received in the concave receiving portion of the first cushion to be layered with the first cushion; and a sensor disposed between a first pressure surface located on a side opposite a direction,in which the concave receiving area of ​​the first cushion is open in the concave receiving area, and a second pressure surface located on a side opposite to the installation element in the second cushion, and which detects a sitting state of the seated person or biological information of the seated person by detecting a physical quantity in accordance with a pressure transmitted from the pressure receiving surface of the seat cushion via the first cushion in the sitting state by the seated person, and which has a flexible property. The seat cushion is installed on the installation seat surface of the installation element, and in an unoccupied state, before the seated person sits on the seat cushion, the first cushion and the second cushion are pre-compressed in a layering direction in which the first cushion and the second cushion are layered.and the sensor is subjected to a pre-compression by a compression reaction force of the first cushion and the second cushion., Effect of the invention

[0009] The sensor is housed in the concave receiving area of ​​the first cushion. Therefore, the sensor is located at a position close to the pressure-receiving surface of the first cushion, compared to the case where it is installed on the installation element. Accordingly, the attenuation of the biological signal transmitted from the seated person due to the first cushion is suppressed. Consequently, the strength of the biological signal received by the sensor can be increased.

[0010] Since the second cushion is located between the sensor and the installation element, the vibration noise of the vehicle can be dampened by the second cushion.

[0011] Because the sensor is flexible, it deforms according to the deformation of the seat cushion when the occupant is seated. Accordingly, noise that differs from the occupant's pressure can be suppressed.

[0012] Because the pre-compression is applied to the sensor due to the compression reaction force of the first cushion and the second cushion, the force can be transmitted to the sensor when the occupant sits on the seat cushion, even if the force exerted by the occupant on the seat cushion is small. This can increase the sensitivity of the sensor.

[0013] Accordingly, on the seat equipped with sensors, the strength of the detected biological signal is increased and the noise is reduced.

[0014] The symbols in parentheses indicated in the claimed scope indicate conformity to specific means described in the embodiments described below and are not to be construed as limitations on the technical scope of the disclosure. BRIEF DESCRIPTION OF THE CHARACTERS [ Fig. 1] The Fig. 1 is a cross-sectional view showing a sensor-equipped seat according to Embodiment 1. [ Fig. 2] The Fig. 2 is an exploded perspective view showing a sensor constituting the sensor-equipped seat according to Embodiment 1. [ Fig. 3] The Fig. 3 is a cross-sectional view of the sensor of Embodiment 1. [ Fig. 4] The Fig. 4 is a partial cross-sectional view showing a state before installation of a first seat surface seat cushion and a second seat surface seat cushion of Embodiment 1. [ Fig. 5] The Fig. 5 is a partial cross-sectional view illustrating a state in which the first seat bottom seat cushion and the second seat bottom seat cushion of Embodiment 1 are installed and further installed on a seat bottom seat frame. [ Fig. 6] The Fig. 6 is a partial cross-sectional view showing a state before installation of a first seat bottom seat cushion and a second seat bottom seat cushion in a sensor-equipped seat of Embodiment 2. [ Fig. 7] The Fig. 7 is a partial cross-sectional view showing a state in which the first seat base seat cushion and the second seat base seat cushion of Embodiment 2 are installed and further installed on a seat base seat frame. [ Fig. 8] The Fig. 8 is a partial cross-sectional view showing a state before installation of a first seat bottom seat cushion and a second seat bottom seat cushion in a sensor-equipped seat of Embodiment 3. [ Fig. 9] The Fig. 9 is a partial cross-sectional view showing a state in which the first seat base seat cushion and the second seat base seat cushion of Embodiment 3 are installed and further installed on a seat base seat frame. [ Fig. 10] The Fig. 10 is a partial cross-sectional view showing a state before installation of a first seat bottom seat cushion and a second seat bottom seat cushion in a sensor-equipped seat of Embodiment 4. [ Fig. 11] The Fig. 11 is a partial cross-sectional view showing a state in which the first seat base seat cushion and the second seat base seat cushion of Embodiment 4 are installed and further installed on a seat base seat frame. [ Fig. 12] The Fig. 12 is a cross-sectional view showing a sensor constituting a sensor-equipped seat according to Embodiment 5. [ Fig. 13] The Fig. 13 is a cross-sectional view showing a sensor constituting a sensor-equipped seat according to Embodiment 6. [ Fig. 14] The Fig. 14 is a partial cross-sectional view illustrating a state in which a first seat bottom seat cushion and a second seat bottom seat cushion are installed and further installed on a seat bottom seat frame in a sensor-equipped seat of Embodiment 7. [ Fig. 15] The Fig. 15 is a cross-sectional view showing a sensor constituting a sensor-equipped seat according to Embodiment 8. [ Fig. 16] The Fig. 16 is a cross-sectional view of a sensor-equipped seat of an embodiment 9, and is a cross-sectional view taken along a line XVI-XVI of Fig. 19. [ Fig. 17] The Fig. 17 is a plan view showing a sensor and a seat cushion having a second seat surface constituting the sensor-equipped seat of Embodiment 9. [ Fig. 18] The Fig. 18 is a plan view showing a first seat bottom seat cushion constituting the sensor-equipped seat of Embodiment 9. [ Fig. 19] The Fig. 19 is a plan view showing the sensor-equipped seat according to Embodiment 9. [ Fig. 20] The Fig. 20 is a cross-sectional view showing a detection area of ​​the sensor constituting the sensor-equipped seat according to Embodiment 9. [ Fig. 21] The Fig. Fig. 21 is a cross-sectional view of the sensor-equipped seat of Embodiment 9, and is a cross-sectional view taken along a line XXI-XXI of Fig. 19. [ Fig. 22] The Fig. 22 is a cross-sectional view showing a sensor-equipped seat according to Embodiment 10. DESCRIPTION OF THE EMBODIMENTS (Embodiment 1) 1-1. Overall configuration of the sensor-equipped seat 1

[0015] The overall configuration of a seat 1 equipped with sensors is described with reference to the Fig. 1. The sensor-equipped seat 1 is suitable for, for example, a vehicle seat for an automobile or a railway vehicle, or a medical examination seat. The sensor-equipped seat 1 is used to detect a sitting state of a seated person or biological information of the seated person. The sitting state of the seated person as a detection target includes, for example, a sitting posture, a change in sitting posture, and so on. The biological information of the seated person as a detection target includes the respiration, pulse, heartbeat, and so on of the seated person.

[0016] For example, when the sensor-equipped seat 1 is mounted on a driver's seat of a vehicle, the sensor-equipped seat 1 is used to detect the driver's sitting state or the driver's biological information at the time of driving.

[0017] The seat 1 equipped with a sensor comprises a frame part 8, a cushion part 9 and a sensor 3, as shown in the Fig. 1. The sensor-equipped seat 1 of the present embodiment includes a headrest 2c. However, the headrest 2c may be omitted.

[0018] The frame part 8 includes a seat base frame 11 (an example of an installation member) and a backrest frame 21. The cushion part 9 includes a seat base cushion 10 (an example of a seat cushion) installed on the seat base frame 11, and a backrest cushion 22 installed on the backrest frame 21. The seat base cushion 10 includes a first seat base cushion 12 (an example of a first cushion) and a second seat base cushion 15 (an example of a second cushion).

[0019] The seat base frame 11 is made of, for example, a rigid material such as metal or hard plastic and is installed in the vehicle. The seat base frame 11 includes a plate-shaped part having a plate shape. The plate-shaped part is installed in the vehicle with the plate surface oriented in the up-down direction. The upper surface of the plate-shaped part is arranged as an installation seat surface 11a, on which the first seat base cushion 12 is installed. A portion other than the plate-shaped part in the seat base frame 11 is formed into an arbitrary shape, such as a bar shape, a column shape, and so on.

[0020] The first seat base cushion 12 is made of an elastic material such as a foam. The first seat base cushion 12 is installed in a state where it rests on the installation seat surface 11a formed on the upper surface of the seat base frame 11. The upper surface of the first seat base cushion 12 serves as a surface (pressure-receiving surface) 12a that receives the pressure exerted by the buttocks of the seated person. The lower surface of the first seat base cushion 12, that is, a counter-pressure-receiving surface 12b, which is a surface on the back side of the pressure-receiving surface 12a, faces the installation seat surface 11a of the seat base frame 11.

[0021] The first seat base cushion 12 has a concave receiving portion 80 that opens downward toward the seat base frame 11 side at the back pressure receiving surface 12b. The cross-sectional shape of the concave receiving portion 80 can be arranged in any shape, such as a polygonal shape, a circular shape, or an elongated circular shape. The cross-sectional shape of the concave receiving portion 80 is rectangular in the present embodiment. In the concave receiving portion 80, a portion located on a side opposite to the direction in which the concave receiving portion 80 is open is arranged as a bottom part 82 of the concave receiving portion 80.

[0022] The second seat base cushion 15 is accommodated in the concave receiving portion 80. The second seat base cushion 15 is attached to the installation seat surface 11a of the seat base frame 11. In the second seat base cushion 15, a surface opposite to the installation seat surface 11a of the seat base frame 11 is arranged as an installation surface 15b. In the state where the first seat base cushion 12 and the second seat base cushion 15 are installed on the seat base frame 11, the back pressure receiving surface 12b of the first seat base cushion 12 and the installation surface 15b of the second seat base cushion 15 are flush.Furthermore, in the state where the first seat base cushion 12 and the second seat base cushion 15 are installed on the seat base frame 11, a gap is formed between the inner side surface of the concave receiving portion 80 and the outer side surface of the second seat base cushion 15. The upper surface of the second seat base cushion 15 (the surface located on the opposite side to the seat base frame) is arranged as a second pressing surface 15a that presses the sensor 3 from the lower side.

[0023] A seat surface skin part 13 (an example of a skin) is laminated on a front surface of the first seat surface cushion 12. The seat surface skin part 13 covers at least the pressure-receiving surface 12a of the first seat surface cushion 12. The seat surface skin part 13 is made of a material that is less shrinkable than the first seat surface cushion 12, for example, fabric, leather, and so on.

[0024] The backrest frame 21 is made of, for example, a rigid material such as metal or hard resin, etc. The backrest frame 21 is plate-shaped, rod-shaped, etc. In the case where a seat body 2 is equipped with a reclining function, the backrest frame 21 is pivotally supported, for example, by the seat base frame 11. Of course, the backrest frame 21 can also be integrally connected to the seat base frame 11.

[0025] The backrest cushion 22 is made of an elastic material, such as foam. The backrest cushion 22 is layered and secured to the front of the backrest frame 21. The front of the backrest cushion 22 serves as a surface (pressure-receiving surface) that absorbs pressure from the back of the seated person. That is, the counterpressure-receiving surface, which is the back surface of the backrest cushion 22, faces the backrest frame 21.

[0026] A backrest outer skin member 23 is applied to the front side of the backrest seat cushion 22. The backrest outer skin member 23 is covered by the backrest seat cushion 22. The backrest outer skin member 23 covers at least the pressure-receiving surface of the backrest seat cushion 22. The backrest outer skin member 23 is made of a material such as fabric, leather, and so on.

[0027] The headrest 2c is arranged at the upper end of a part of the backrest surface part 2b. The headrest 2c includes the cushion 25 and an outer skin part 26. Although the first seat surface cushion 12 and the backrest cushion 22 are arranged in the Fig. 1 are separate components, the first seat surface cushion 12 and the backrest cushion 22 may also be integral. Although the backrest cushion 22 and the headrest 2c are separate components, the backrest cushion 22 and the headrest 2c may also be integrated.

[0028] The sensor 3 is arranged between a first pressure surface 82b formed in the concave receiving portion 80 of the first seat cushion 12 and the second pressure surface 15a of the second seat cushion 15. The first pressure surface 82b is provided on a convex part 82a, which will be described later. At this time, with the person sitting on the seat body 2, pressure is exerted from the buttocks of the person sitting on the pressure receiving surface 12a of the first seat cushion 12, and the pressure is transmitted via the first seat cushion 12 to the first pressure surface 82b of the first seat cushion 12. Furthermore, the sensor 3 receives the pressure from the first pressure surface 82b of the first seat cushion 12.That is, in the seated state, according to the seated person, the sensor 3 detects a physical quantity corresponding to the pressure transmitted from the pressure receiving surface 12a of the first seat surface cushion 12 through the first seat surface cushion 12. Furthermore, the sensor 3 detects the seated state of the seated person or the biological information of the seated person based on the detected physical quantity.

[0029] Although the sensor 3 is arranged on a part of the seat surface 2a, the sensor 3 may also be arranged on the part of the backrest 2b. In this case, the sensor 3 is arranged between the backrest frame 21 and the backrest cushion 22. Furthermore, in the seated state, the sensor 3 detects a physical quantity corresponding to the seated person in accordance with the pressure transmitted from the pressure-receiving surface 12a of the backrest cushion 22 via the backrest cushion 22. Furthermore, based on the detected physical quantity, the sensor 3 can detect the seated person's sitting state or the seated person's biological information. 1-2. Sensor 3 Configuration

[0030] The configuration of sensor 3 is described with reference to the Fig. 2 and Fig. 3. In the Fig. 2 and Fig. 3, the sensor 3 is shown alone, i.e. the sensor 3 before mounting on the seat body 2.

[0031] The sensor 3 is formed as a flat sheet and has a flexible property. The sensor 3 includes an insulating sheet 36, a first electrode sheet 32, a first film sheet 30, a second electrode sheet 37, and a second film sheet 41. The insulating sheet 36 has a first surface 36a and a second surface 36b. The first electrode sheet 32 ​​is layered on the first surface 36a of the insulating sheet 36. The first film sheet 30 covers the first electrode sheet 32. The second electrode sheet 37 is layered on the second surface 36b of the insulating sheet 36. The second film sheet 41 covers the second electrode sheet 37. Hereinafter, unless otherwise stated, the layer direction refers to the layer direction of the first film sheet 30, the first electrode sheet 32, the insulating sheet 36, the second electrode sheet 37, and the second film sheet 41, which constitute the sensor 3.

[0032] The insulating film 36 is formed in a film shape (membrane shape) and has both insulating and flexible properties. The insulating film 36 is, for example, rectangular in shape. The material of the insulating film 36 is not particularly limited and may also be a resin or an elastomer. For example, polyolefin-based resins and polyamide-based resins can be used as the resin. For example, urethane-based elastomers, acrylic-based elastomers, ester-based elastomers, polyamide-based elastomers, olefin-based elastomers, and styrene-based elastomers can be used as the elastomer. If the insulating film 36 is made using an elastomer, the insulating film 36 is elastically deformable.

[0033] The first electrode foil 32 has a flexible property and is formed in a foil shape (membrane shape). The first electrode foil 32 includes, for example, a first body part 32a having a rectangular shape and a first ear part 32b extending from one side of the rectangular shape to a position. The first electrode foil 32 includes a first electrode layer 34 formed on one surface (the lower surface in the Fig. 2) is arranged opposite the first surface 36a of the insulating film 36. The first electrode layer 34 consists of a pair of electrodes arranged on the first surface 36a and the second surface 36b of the insulating film 36, respectively. In this embodiment, the first electrode layer 34 is formed by one electrode. The first ear portion 32b is electrically connected to the first electrode layer 34, and a first terminal portion 35 is provided on the first ear portion 32b, which is electrically connected to an external circuit.

[0034] The first film sheet 30 has an insulating property and a flexible property and is formed in a film shape (membrane shape). The first film sheet 30 is made of a conventional resin or elastomer. The first film sheet 30 has a rectangular shape, for example. The first film sheet 30 covers a surface on a side opposite to the insulating film 36 in the first electrode sheet 32. Accordingly, when a voltage is applied to the first electrode sheet 32, the first electrode sheet 32 ​​is protected. The material of the first film sheet 30 may be the same as or different from the material of the insulating film 36. If the material of the first film sheet 30 is a rigid material, the first electrode sheet 32 ​​can be protected.In the first film sheet 30, the surface on a side opposite the first electrode sheet 32 ​​is arranged as a pressure detection surface 31, which receives a pressure from the first seat surface seat cushion 12.

[0035] The second electrode foil 37 is formed as a separate component from the first electrode foil 32 and arranged to face the back of the first electrode foil 32. The second electrode foil 37 includes, for example, a second body portion 37a having a rectangular shape and a second ear portion 37b extending from one side of the rectangular shape. The insulating foil 36 is arranged between the second electrode foil 37 and the first electrode foil 32. The second electrode foil 37 has a flexible property and is formed in a foil shape (membrane shape). The second electrode foil 37 includes a second electrode layer 39 formed on one surface (the upper surface in the Fig. 2) is arranged opposite the second surface 36b of the insulating film 36. The second electrode layer 39 is arranged so that it is spaced apart from and opposite the first electrode layer 34 constituting the first electrode film 32. That is, the first electrode layer 34 and the second electrode layer 39 are arranged so that they overlap when projected in the layer direction. The second electrode layer 39 forms the other of the pair of electrodes for an electrostatic sensor or a piezoelectric sensor.

[0036] Furthermore, in this embodiment, the second electrode layer 39 consists of a plurality of electrode groups, and each of the electrodes constituting the electrode groups is arranged in a layer direction so as to be opposite to a first electrode layer 34 constituting the first electrode foil 32. In the Fig. In the embodiment shown in Figure 2, the second electrode layer 39 is formed, for example, by 16 electrodes arranged in four columns and four rows. However, the number of the second electrode group constituting the second electrode layer 39 can be arbitrarily determined. Furthermore, the second electrode sheet 37 includes a printed pattern in addition to the second electrode layer 39. The second ear portion 37b is electrically connected to the second electrode layer 39, and a second terminal 40 is provided on the second ear portion 37b, which is electrically connected to an external circuit.

[0037] The second film sheet 41 has an insulating property and a flexible property and is formed in a film shape (membrane shape). The second film sheet 41 is made of resin or elastomer. The second film sheet 41 is shaped, for example, rectangular. The second film sheet 41 covers a surface on a side of the second electrode sheet 37 opposite the insulating film 36. Accordingly, when a voltage is applied to the second electrode sheet 37, the second electrode sheet 37 is protected. The material of the second film sheet 41 may be the same as or different from the material of the insulating film 36. If the material of the second film sheet 41 is a rigid material, the second electrode sheet 37 can be protected.

[0038] The first electrode layer 34 and the second electrode layer 39 can also each consist of a single electrode. Furthermore, the first electrode layer 34 and the second electrode layer 39 can each be formed by multiple electrodes. For this purpose, for example, the facing positions of the electrodes forming the first electrode layer 34 and the electrodes facing the second electrode layer 39 can be arranged in a row or in a matrix. 1-3. Configurations of the first seat cushion 12 and the second seat cushion 15

[0039] The configurations of the first seat cushion 12 and the second seat cushion 15 are described with reference to the Fig. 4 and Fig. 5. The Fig. 4 shows the state before the sensor 3 and the second seat cushion 15 are installed on the first seat cushion 12. The Fig. 5 shows the state after the sensor 3 and the second seat cushion 15 are installed on the first seat cushion 12.

[0040] The first seat cushion 12 includes a concave receiving portion 80 formed on the back pressure receiving surface 12b. The concave receiving portion 80 is open to the side opposite the pressure receiving surface 12a of the first seat cushion 12, that is, to the side of the seat frame 11. The concave receiving portion 80 accommodates the sensor 3.

[0041] The shape of the opening part of the concave receiving portion 80 is larger than the outer shape of the sensor 3. Although the shape of the opening part of the concave receiving portion 80 is not limited, the opening part of the concave receiving portion 80 is formed, for example, in a rectangular shape larger than the outer shape of the sensor 3. Moreover, an inner peripheral wall 81 of the concave receiving portion 80 is also rectangular in shape. The inner peripheral wall 81 corresponds to the shape of the outer peripheral surface of the sensor 3 and is shaped to be larger than the outer shape of the sensor 3.

[0042] The bottom part 82 of the concave receiving portion 80 has a convex part 82a and a recessed groove 82c. The convex part 82a is formed near the center of the bottom part 82. The convex part 82a protrudes from the bottom part 82 of the concave receiving portion 80 toward the opening of the concave receiving portion 80. That is, the convex part 82a protrudes from the bottom part 82 toward the side of the seat bottom frame 11. Furthermore, a gap is formed between the outer side surface of the convex part 82a and the inner side surface of the concave receiving portion 80.

[0043] In this embodiment, the convex portion 82a is formed from an elastic material with a single elastic modulus. The convex portion 82a is formed by the elastic material that forms the first seat cushion 12. That is, the elastic modulus of the convex portion 82a is equal to the elastic modulus of the other portions that form the first seat cushion 12.

[0044] The recessed groove 82c is formed along the edge of the convex part 82a. That is, the recessed groove 82c forms a boundary portion between the inner side surface and the convex part 82a of the concave receiving portion 80 and is formed along the entire edge of the convex part 82a.

[0045] The second seat cushion 15 has an overall rectangular parallelepiped shape. The second seat cushion 15 has the installation surface 15b installed on the seat frame 11 and the second pressure surface 15a located on a side opposite the installation surface 15b. The sensor 3 is attached to the second pressure surface 15a in a layered state. The sensor 3 is attached to the second pressure surface 15a by a conventional means such as gluing or melting.

[0046] The first seat cushion 12 and the second seat cushion 15 are layered along the layer direction specified for the sensor 3.

[0047] The second seat cushion 15 may be made of the same or different materials as the first seat cushion 12. Furthermore, the elastic modulus of the second seat cushion 15 may be the same as or different from the elastic modulus of the first seat cushion 12. As described below, by adjusting the elastic modulus of the second seat cushion 15, which differs from the elastic modulus of the first seat cushion 12, the pressure exerted on the sensor 3 can be adjusted.

[0048] To make the elastic modulus of the first seat cushion 12 and the elastic modulus of the second seat cushion 15 different, for example, the material of the first seat cushion 12 and the material of the second seat cushion 15 may be different, and the porosity of the first seat cushion 12 and the porosity of the second seat cushion 15 may be different. Furthermore, regarding the fillers added to the first seat cushion 12 and the second seat cushion 15, the type of filler, the amount of added filler, and so on may be different for each of the first seat cushion 12 and the second seat cushion 15.As described above, the elastic modulus of the first seat cushion 12 and the elastic modulus of the second seat cushion 15 can be made different in any way.

[0049] In the state where the second seat bottom cushion 15 is housed in the concave accommodating portion 80, the sensor 3 is in a state of being sandwiched between the first pressing surface 82b of the convex part 82a and the second pressing surface 15a of the second seat bottom cushion 15. In the state where the second seat bottom cushion 15 is housed in the concave accommodating portion 80, the convex part 82a is arranged so that the convex part 82a of the concave accommodating portion 80 protrudes toward the sensor 3. The convex part 82a directly applies pressure to the pressure detection surface 31 of the sensor 3. The area of ​​the sensor 3 is set to be smaller than the area of ​​the first pressing surface 82b and the area of ​​the second pressing surface 15a.

[0050] The shape of the end having the second pressing surface 15a in the second seat bottom seat cushion 15 and the shape of the end forming the installation surface 15b can be set to be substantially the same as the shape of the convex part 82a of the concave receiving portion 80. Being substantially the same means that both the case of being identical and the case of being recognized as substantially identical even though they are not identical are included. The same applies to the following. In the state where the second seat bottom seat cushion 15 is housed in the concave receiving portion 80, a gap is provided between the outer side surface of the second seat bottom seat cushion 15 and the inner side surface of the concave receiving portion 80.

[0051] Various dimensions of the concave receiving portion 80 and the second seat surface seat cushion 15 in the state before installation of the concave receiving portion 80 and the second seat surface seat cushion 15 will be described with reference to FIG. Fig. 4. The width dimension of the opening of the concave receiving portion 80 is defined as c. The width dimension of the convex part 82a and the width dimension of the second seat bottom seat cushion 15 are defined as d. In the layering direction of the first seat bottom seat cushion 12 and the second seat bottom seat cushion 15, the depth dimension from the back pressure receiving surface 12b of the concave receiving portion 80 to the tip end of the convex part 82a is defined as a.

[0052] In the state before the first seat bottom seat cushion 12 and the second seat bottom seat cushion 15 are installed, it is arranged so that a < b. In other words, in the layering direction of the first seat bottom seat cushion 12 and the second seat bottom seat cushion 15, the sum b of the thickness dimension of the second seat bottom seat cushion 15 and the thickness dimension of the sensor 3 is set to be larger than the depth dimension a from the back pressure receiving surface 12b of the concave receiving portion 80 to the tip end of the convex part 82a.

[0053] Furthermore, in the state before the first seat base cushion 12 and the second seat base cushion 15 are installed, it is provided that c > d. In other words, in the state before the first seat base cushion 12 and the second seat base cushion 15 are installed, the width dimension d of the second seat base cushion 15 is set to be smaller than the width dimension c of the opening of the concave receiving portion 80.

[0054] Then, in the state where the second seat base seat cushion 15 is accommodated in the concave receiving portion 80 and further installed on the seat base seat frame 11, various dimensions of the concave receiving portion 80 and the second seat base seat cushion 15 are determined with reference to the Fig. 5 described.

[0055] The second seat cushion 15 is contracted by being sandwiched between the convex portion 82a and the seat frame 11. Consequently, the sum of the thickness dimension of the second seat cushion 15 and the thickness dimension of the sensor 3 is equal to the depth dimension a from the back pressure receiving surface 12b of the first seat cushion 12 to the first pressure surface 82b of the convex portion 82a. Accordingly, the pressure detection surface 31 of the sensor 3 is pre-compressed by the first pressure surface 82b of the convex portion 82a and the second pressure surface 15a of the second seat cushion 15. The amount of pre-compression at this time is based on the elasticity of the first seat cushion 12 and the elasticity of the second seat cushion 15.

[0056] Meanwhile, the pre-compression amount with respect to the seat bottom frame 11 is determined by the dead weight of the first seat bottom cushion 12. Therefore, the pre-compression amount with respect to the pressure detection surface 31 of the sensor 3 due to the convex part 82 is set to be larger than the pre-compression amount with respect to the seat bottom frame (corresponding to the periphery of the pressure detection surface 31) due to the first seat bottom cushion 12. Accordingly, in the state where the second seat bottom cushion 15 is housed in the concave receiving portion 80 and further installed on the seat bottom frame 11, the pressure detection surface 31 of the sensor 3 receives a pressure greater than the dead weight of the first seat bottom cushion 12 from the convex portion 82a.

[0057] As in the Fig. 5, in the state where the second seat base seat cushion 15 is accommodated in the concave receiving portion 80 and also installed on the seat base seat frame 11, c > d, and the width dimension d of the second seat base seat cushion 15 is set to be smaller than the width dimension of the opening of the concave receiving portion 80. That is, a gap is formed between the outer side surface of the second seat base seat cushion 15 and the inner side surface of the concave receiving portion 80. 1-4. Detailed configuration of the sensor-equipped seat 1

[0058] As a detailed configuration of the sensor-equipped seat 1, the installation state of the sensor 3 and the concave receiving portion 80 is mainly described based on the Fig. 5. The Fig. 5 shows a state in which the seated person has not sat on the seat body 2. Therefore, the state in which the seated person is not sitting on the seat body 2 will be described below.

[0059] The first seat base cushion 12 is fixed to the seat base frame 11. Accordingly, the periphery of the concave receiving portion 80 in the back pressure receiving surface 12b of the first seat base cushion 12 is in contact with the seat base frame 11 in a state of being slightly pre-compressed with respect to the seat base frame 11.

[0060] The sensor 3 is arranged between the first pressure surface 82b of the first seat cushion 12 and the second pressure surface 15a of the second seat cushion 15. The second seat cushion 15 is attached to the seat frame 11.

[0061] Furthermore, the sensor 3 is housed in the concave receiving portion 80 of the first seat bottom seat cushion 12. The tip end of the convex part 82a of the concave receiving portion 80 is in contact with the pressure detection surface 31 of the sensor 3. That is, the pressure detection surface 31 of the sensor 3 receives pressure from the convex part 82a in the first seat bottom seat cushion 12. The sensor 3 detects a physical quantity in accordance with the pressure received from the pressure detection surface 31.

[0062] Moreover, as described above, in the state before the first seat bottom seat cushion 12 and the second seat bottom seat cushion 15 are installed, the sum b of the thickness dimension of the second seat bottom seat cushion 15 and the thickness dimension of the sensor 3 is set to be greater than the depth dimension a from the back pressure receiving surface 12b of the concave receiving portion 80 to the tip end of the convex part 82a. In the state where the second seat bottom seat cushion 15 is housed in the concave receiving portion 80 and further installed on the seat bottom seat frame 11, the sum of the thickness dimension of the second seat bottom seat cushion 15 and the thickness dimension of the sensor 3 is equal to the depth dimension a from the back pressure receiving surface 12b of the first seat bottom seat cushion to the first pressure surface 82b of the convex part 82a. The convex part 82a is thus pre-compressed relative to the pressure detection surface 31 of the sensor 3.Specifically, the pre-compression amount with respect to the pressure detection surface 31 of the sensor 3 due to the convex part 82 is set to be sufficiently larger than the pre-compression amount with respect to the seat base frame (corresponding to the perimeter of the pressure detection surface 31) due to the first seat base cushion 12. Accordingly, the pressure detection surface 31 of the sensor 3 receives a pressure greater than the dead weight of the first seat base cushion 12.

[0063] In the state where the second seat base cushion 15 is accommodated in the concave receiving portion 80 of the first seat base cushion 12 and no load is applied to the second seat base cushion 15, the second seat base cushion 15 protrudes from the back pressure receiving surface 12b of the first seat base cushion 12. By installing the seat base cushion 10 in the state where the second seat base cushion 15 protrudes from the first seat base cushion 12 onto the installation seating surface 11a of the seat base frame 11, the back pressure receiving surface 12b of the first seat base cushion 12 can be flush with the installation surface 15b opposite to the installation seating surface 11a of the second seat base cushion 15. Since the second seat cushion 15 can be reliably compressed, the first seat cushion 12 and the second seat cushion 15 can be reliably pre-compressed. 1-5. Operation of Sensor 3

[0064] The detection target of the sensor 3 is the sitting state of the seated person, such as changes in sitting posture and so on. Since the deformation state of the first seat surface cushion 12 changes when the sitting posture of the seated person changes, the sensor 3 receives the pressure transmitted via the first seat surface cushion 12. Specifically, the pressure that the sensor 3 receives from the convex part 82a of the first seat surface cushion 12 changes when the sitting posture of the seated person changes. That is, the sensor 3 detects a physical quantity in accordance with the changed pressure and detects a change in the sitting posture of the seated person based on such a physical quantity.

[0065] Other detection targets of the sensor 3 include biological information of the seated person, such as respiration, pulse, heartbeat, and so on. Respiration, pulse, and heartbeat generate subtle vibrations on the skin surface of the seated person. Due to the subtle vibrations, the sensor 3 receives the pressure transmitted via the first seat surface cushion 12. Specifically, due to the subtle vibrations, the pressure that the sensor 3 receives from the convex part 82a of the first seat surface cushion 12 changes. That is, the sensor 3 outputs a physical quantity in accordance with the changed pressure and detects the biological information of the seated person based on this physical quantity. 1-6. Effects due to the configuration of sensor 3

[0066] The sensor 3 is arranged between the seat bottom frame 11 and the back pressure receiving surface 12b of the first seat bottom cushion 12. That is, the sensor 3 is arranged on the seat bottom frame 11. Accordingly, the sensor 3 can be positioned more stably than when it is arranged in the first seat bottom cushion 12.

[0067] Since the sensor 3 is housed in the concave receiving portion 80 of the first seat base cushion 12, the sensor 3 is located in a position close to the pressure receiving surface of the first seat base cushion 12 compared to when installed in the seat base frame 11. This suppresses the attenuation of the biological signal transmitted from the seated person due to the first seat base cushion 12, so that the strength of the biological signal received by the sensor 3 can be increased.

[0068] Since the second seat cushion 15 is arranged between the sensor 3 and the seat frame 11, the vibration noise of the vehicle can be dampened by the second seat cushion 15.

[0069] Furthermore, since the pre-compression due to the pressure reaction force of the first seat bottom cushion 12 and the second seat bottom cushion 15 is applied to the sensor 3, the force can be transmitted to the sensor 3 when the occupant sits on the seat body 2, even if the force exerted by the occupant on the seat bottom cushion 10 is small. This can increase the sensitivity of the sensor 3. 1-7. Effects due to the flexibility of the sensor 3

[0070] Since the sensor 3 is flexible, the sensor 3 deforms according to the deformation of the first seat cushion 12 when the occupant sits on the first seat cushion 12. Accordingly, the noise caused by the pressure of the occupant can be suppressed. 1-8. Effects of pre-compression of the convex part 82a

[0071] The effects of the sensor 3 in the sensor-equipped seat 1 will be described. As described above, in the unoccupied state in which the occupant is not sitting on the seat body 2, in the first seat-bottom seat cushion 1, the pre-compression amount with respect to the pressure detection surface 31 of the sensor 3 is set larger than the pre-compression amount with respect to the periphery (for example, the seat-bottom seat frame 11) of the pressure detection surface 31.

[0072] Accordingly, in the unoccupied state, a stress greater than that in other regions is generated at the convex part 82a of the first seat bottom cushion 12. The convex part 82a is pre-compressed in the normal direction of the pressure detection surface 31 of the sensor 3. Accordingly, in the first seat bottom cushion 12, the greatest stress is generated at the convex part 82a, and a stress greater than that in the other portions is generated in the area from the convex part 82a to the pressure receiving surface 12a of the first seat bottom cushion 12. Therefore, the sensor 3 received pressure from the convex part 82a in the unoccupied state.

[0073] Next, consider the case where the sitter sits on the seat body 2. When the sitter sits on the seat body 2, a force is exerted from the sitter's buttocks to the first seat surface cushion 12. As a result, the first seat surface cushion 12 deforms depending on the sitter's buttocks and body weight. Moreover, the magnitude of stress generated in the first seat surface cushion 12 is greater in the seated state than in the non-seated state. However, even in the seated state, in the first seat surface cushion 12, the greatest stress is generated at the convex part 82a, and stress greater than that in other portions is generated within the range from the convex part 82a to the pressure-receiving surface 12a of the first seat surface cushion 12.

[0074] One of the detection targets of sensor 3 is the sitting state of the seated person, such as changes in sitting posture. Other detection targets of sensor 3 are biological information of the seated person, such as breathing, pulse, heart rate, and so on.

[0075] Since the pressure detection surface 31 of the sensor 3 receives pressure from the convex part 82a of the first seat cushion 12, the sensor 3 detects the sitting state of the sitter or the biological information of the sitter. However, the first seat cushion 12 absorbs the force exerted by the sitter. Therefore, even if a force is applied to the pressure detection surface 12a of the first seat cushion 12 due to changes in the sitting state of the sitter or vibrations generated by a living body, the sensor 3 is unable to detect the sitting state or the biological information of the sitter if the first seat cushion 12 absorbs all the force.

[0076] However, as described above, the pre-compression exerted by the first seat cushion 12 is applied to the pressure detection surface 31 of the sensor 3 in the unoccupied state. However, in the unoccupied state, the first seat cushion 12 also exerts pre-compression on the periphery (seat frame 11) of the pressure detection surface 31 of the sensor 3. Moreover, in the first seat cushion 12 and in the unoccupied state, the pre-compression amount with respect to the pressure detection surface 31 of the sensor 3 is set to be greater than the pre-compression amount with respect to the surroundings of the pressure detection surface 31.

[0077] In this way, by setting the pre-compression amount with respect to the pressure detection surface 31 of the sensor 3 larger than the ambient pressure, when the occupant sits on the seat body 2, even if the force exerted by the occupant on the first seat surface cushion 12 is very small, such a force is still transmitted to the pressure detection surface 31 of the sensor 3. Accordingly, the pressure detection surface 31 of the sensor 3 can detect subtle pressure changes acting on the first seat surface cushion 12.

[0078] That is, even if the sitting position of the seated person changes only slightly, the pressure detection surface 31 of the sensor 3 can detect a subtle pressure change transmitted along with the change. Accordingly, the sitting position of the seated person can be detected with high precision. Moreover, the magnitude of the force exerted by the seated person on the first seat cushion 12 due to vibrations caused by a living body, such as respiration, pulse, and heartbeat, is small. In this case, too, the pressure detection surface 31 of the sensor 3 can detect subtle pressure changes transmitted along with the vibrations generated by the living body. Accordingly, the biological information of the seated person can be detected with high precision.

[0079] Specifically, as described above, in the unoccupied state, in the first seat bottom seat cushion 12, the largest stress is generated at the convex part 82a, and a stress greater than that in other portions is generated within the region from the convex part 82a to the pressure-receiving surface 12a of the first seat bottom seat cushion 12. Therefore, the region where stress is generated in the unoccupied state has a higher sensitivity to force transmission compared to other regions.

[0080] Accordingly, even if the force applied to the pressure-receiving surface 12a of the first seat cushion 12 is small, the small force is transmitted with high sensitivity across the area from the pressure-receiving surface 12a of the first seat cushion 12 to the pressure-detecting surface 31 of the sensor 3 via the convex portion 82a. This allows the sitting state or biological information of the seated person to be detected with high precision.

[0081] Furthermore, for the first seat cushion 12 having the pressure-receiving surface 12a on which the occupant sits, a modulus of elasticity can be set that takes the occupant's seating comfort into account. In the case where the pre-compression applied to the sensor 3 is taken into account, the modulus of elasticity of the first seat cushion 12 is not optimal considering seating comfort. In this case, the pre-compression applied to the sensor 3 can be properly adjusted by making the modulus of elasticity of the second seat cushion 15 and the modulus of elasticity of the first seat cushion 12 different from each other. Accordingly, the sensitivity of the sensor 3 can be increased.

[0082] The first pad includes the recessed groove 82c formed at the lower part 82 of the concave receiving portion 80, formed along the edge of the convex part 82a, and separating the outer side surface of the convex part 82a and the inner side surface of the concave receiving portion 80.

[0083] Since the outer side surface of the convex part 82a and the inner side surface of the concave receiving portion 80 are separated by the recessed groove 82c, when the force exerted by the occupant on the pressure-receiving surface 12a of the first cushion is transmitted from the convex part 82a to the sensor 3, the generation of frictional force due to sliding contact between the outer side surface of the convex part 82a and the inner side surface of the concave receiving portion 80 can be suppressed. Accordingly, the sensitivity of the sensor 3 can be increased because the attenuation of the force exerted by the occupant on the pressure-receiving surface 12a of the first seat-surface seat cushion 12 due to friction is suppressed.

[0084] Furthermore, since the first seat surface cushion 12 is covered by the seat surface outer skin part 13, the first seat surface cushion 12 is prevented from deforming and expanding outward. Accordingly, the decrease in the pre-compression amount due to the pre-compressed first seat surface cushion 12 expanding outward is suppressed. As a result, the decrease in the sensitivity of the sensor 3 is suppressed compared to the case where the first seat surface cushion 12 is not covered by the seat surface outer skin part 13. (Embodiment 2)

[0085] The sensor-equipped seat 1 of the present embodiment will be described with reference to Fig. 6 and Fig. 7. This embodiment differs from Embodiment 1 in that a first seat bottom seat cushion 112 of the sensor-equipped seat 1 of the embodiment does not have the convex part 82a. The underside of a concave receiving portion 180 is arranged as a first pressing part 182b that presses the sensor 3. Note that, unless otherwise indicated, among the reference numerals used in Embodiment 2 and subsequent embodiments, the same reference numerals as those used in the previously described embodiments represent the same components as those in the previously described embodiments.

[0086] As in the Fig. 6, in the layering direction of the first seat surface seat cushion 112 and the second seat surface seat cushion 15, a depth dimension from the back pressure receiving surface 12b of the concave receiving portion 180 to the first pressure surface 182b is defined as a.

[0087] In other words, in the layering direction of the first seat surface seat cushion 112 and the second seat surface seat cushion 15, the sum b of the thickness dimension of the second seat surface seat cushion 15 and the thickness dimension of the sensor 3 is set to be larger than the depth dimension a from the back pressure receiving surface 12b of the concave receiving portion 180 to the first pressure surface 182b.

[0088] Then, in the state where the second seat base seat cushion 15 is accommodated in the concave receiving portion 180 and further installed on the seat base seat frame 11, various dimensions of the concave receiving portion 180 and the second seat base seat cushion 15 are determined with reference to the Fig. 7 described.

[0089] In the state where the second seat bottom cushion 15 is housed in the concave receiving portion 180 and further installed on the seat bottom frame 11, the back pressure receiving surface 12b of the first seat bottom cushion 112, the installation surface 15b of the second seat bottom cushion 15, and the installation surface 11a of the seat bottom frame 11 are flush. Accordingly, the second seat bottom cushion 15 is shaped to be capable of exerting pre-compression with respect to the sensor 3. (Embodiment 3)

[0090] Next, the sensor-equipped seat 1 of an embodiment 3 will be described with reference to FIG. Fig. 8 and Fig. 9. This embodiment differs from Embodiment 2 in that the sensor-equipped seat 1 of the embodiment includes an elastic layer 90 that is elastically deformable between the first seat surface cushion 112 and the sensor 3.

[0091] The elastic layer 90 is applied to a pressure detection surface 31 of the sensor 3. The elastic layer 90 is formed from an elastically deformable resin or elastomer, etc., and any material can be selected. The elastic modulus of the elastic layer 90 may be the same as or different from the elastic modulus of the first seat cushion 112. Furthermore, the elastic modulus of the elastic layer 90 may be the same as or different from the elastic modulus of the second seat cushion 15. For example, polyolefin-based resins and polyamide-based resins can be used as the resin constituting the elastic layer 90. For example, urethane-based elastomers, acrylic-based elastomers, ester-based elastomers, polyamide-based elastomers, olefin-based elastomers, and styrene-based elastomers can be used as the elastomer.

[0092] As in the Fig. 8, in the layering direction of the first seat surface seat cushion 112 and the second seat surface seat cushion 15, a depth dimension from the back pressure receiving surface 12b of the concave receiving portion 180 to the first pressure surface 182b is defined as a.

[0093] In the embodiment, in the state before the first seat surface cushion 12 and the second seat surface cushion 15 are installed, it is provided that a < b. In other words, in the layering direction of the first seat surface cushion 12 and the second seat surface cushion 15, the sum b of the thickness dimension of the second seat surface cushion 15, the thickness dimension of the sensor 3, and the thickness dimension of the elastic layer 90 is set to be greater than the depth dimension a from the back pressure receiving surface 12b of the concave receiving portion 180 to the first pressure surface 182b.

[0094] Then, in the state where the second seat base seat cushion 15 is accommodated in the concave receiving portion 180 and further installed on the seat base seat frame 11, various dimensions of the concave receiving portion 180 and the second seat base seat cushion 15 are determined with reference to the Fig. 9 described.

[0095] In the state where the second seat bottom cushion 15 is housed in the concave receiving portion 180 and further installed on the seat bottom frame 11, the back pressure receiving surface 12b of the first seat bottom cushion 112, the installation surface 15b of the second seat bottom cushion 15, and the installation surface 11a of the seat bottom frame 11 are flush. Accordingly, the second seat bottom cushion 15 is shaped to be capable of exerting pre-compression with respect to the sensor 3.

[0096] Since the elastic layer 90 is arranged between the first seat cushion 112 and the sensor 3, the strength of the pre-compression exerted by the first seat cushion 112 on the sensor 3 can be adjusted by changing the material of the elastic layer 90, the elastic modulus of the elastic layer 90, the thickness of the elastic layer 90, and so on. Accordingly, the sensitivity of the sensor 3 can also be adjusted.

[0097] Moreover, in the embodiment, the area of ​​the elastic layer 90 is equal to or smaller than the area of ​​the pressure detection surface 31 of the sensor 3. Accordingly, in the state where the second seat bottom seat cushion 15 is accommodated in the concave receiving portion 180 and further installed on the seat bottom seat frame 11, the pre-compression amount with respect to the pressure detection surface 31 is set to be larger than the pre-compression amount with respect to the seat bottom seat frame 11 (vicinity of the pressure detection surface). Accordingly, even if the force exerted by the occupant on the first seat surface cushion 112 when the occupant sits on the seat 1 is small, the small force can be transmitted with high sensitivity over the range from the pressure receiving surface 12a of the first seat surface cushion 112 to the pressure detecting surface 31 of the sensor 3 via the elastic layer 90.This allows the sitting position or the biological information of the sitting person to be detected with high precision. (Embodiment 4)

[0098] Next, the sensor-equipped seat 1 of an embodiment 4 will be described with reference to FIG. Fig. 10 and Fig. 11. This embodiment differs from Embodiment 2 in that the sensor-equipped seat 1 of the embodiment includes an elastic layer 90 that is elastically deformable between the sensor 3 and the second seat surface cushion 15.

[0099] The elastic layer 90 is applied to the second pressing surface 15a of the second seat cushion 15. The elastic layer 90 of the embodiment is the same as that of Embodiment 3. Therefore, a repeated description will be omitted.

[0100] As in the Fig. 10, in the layering direction of the first seat surface seat cushion 112 and the second seat surface seat cushion 15, a depth dimension from the back pressure receiving surface 12b of the concave receiving portion 180 to the first pressure surface 182b is defined as a.

[0101] In the embodiment, in the state before the first seat surface cushion 112 and the second seat surface cushion 15 are installed, it is provided that a < b. In other words, in the layering direction of the first seat surface cushion 112 and the second seat surface cushion 15, the sum b of the thickness dimension of the second seat surface cushion 15, the thickness dimension of the elastic layer 90, and the thickness dimension of the sensor 3 is set to be larger than the depth dimension a from the back pressure receiving surface 12b of the concave receiving portion 180 to the first pressure surface 182b.

[0102] Then, in the state where the second seat base seat cushion 15 is accommodated in the concave receiving portion 180 and further installed on the seat base seat frame 11, various dimensions of the concave receiving portion 180 and the second seat base seat cushion 15 are determined with reference to the Fig. 11 described.

[0103] In the state where the second seat bottom cushion 15 is housed in the concave receiving portion 180 and further installed on the seat bottom frame 11, the back pressure receiving surface 12b of the first seat bottom cushion 112, the installation surface 15b of the second seat bottom cushion 15, and the installation surface 11a of the seat bottom frame 11 are flush. Accordingly, the second seat bottom cushion 15 is shaped to be capable of exerting pre-compression with respect to the sensor 3.

[0104] Since the elastic layer 90 is arranged between the second seat cushion 15 and the sensor 3, the strength of the pre-compression exerted by the second seat cushion 15 on the sensor 3 can be adjusted by changing the material of the elastic layer 90, the elastic modulus of the elastic layer 90, the thickness of the elastic layer 90, and so on. Accordingly, the sensitivity of the sensor 3 can also be adjusted.

[0105] However, it can also be designed so that an elastic layer is arranged between the first seat cushion 112 and the sensor 3 and the elastic layer 90 is arranged between the second seat cushion 15 and the sensor 3. (Embodiment 5)

[0106] Next, the sensor-equipped seat 1 of Embodiment 5 will be described with reference to FIG. Fig. 12. This embodiment differs from Embodiment 1 in that a sensor 103 of the sensor-equipped seat 1 of the embodiment includes an elastic sensor layer 91 between the first film sheet 30 and the first electrode sheet 32.

[0107] As in the Fig. As shown in Figure 12, the sensor 103 of the embodiment includes the elastically deformable elastic sensor layer 91 between the first film sheet 30 and the first electrode sheet 32. The elastic sensor layer 91 is rectangular in shape and has an area substantially equal to the area of ​​the first film sheet 30 and the first electrode sheet 32. Since the material constituting the elastic sensor layer 91 of the embodiment is the same as the elastic layer 90 of Embodiment 3, repeated description will be omitted.

[0108] Since the sensor 103 is provided with the elastic sensor layer 91, the strength of the pre-compression exerted by the first seat cushion 12 and the second seat cushion 15 can be finely adjusted in the sensor 103. Accordingly, the sensitivity of the sensor 103 can also be finely adjusted.

[0109] Since the elastic sensor layer 91 is arranged between the first film foil 30 and the first electrode foil 32, the strength of the pre-compression emanating from the first seat surface cushion 12 can be adjusted. (Embodiment 6)

[0110] Next, the sensor-equipped seat 1 of an embodiment 6 will be described with reference to FIG. Fig. 13. This embodiment differs from Embodiment 1 in that a sensor 203 of the sensor-equipped seat 1 of the embodiment includes the elastic sensor layer 91 between the second film sheet 41 and the second electrode sheet 37.

[0111] As in the Fig. As shown in Figure 13, the sensor 203 of the embodiment includes the elastically deformable elastic sensor layer 91 between the second film sheet 41 and the second electrode sheet 37. The elastic sensor layer 91 is rectangular in shape and has an area substantially equal to the area of ​​the second film sheet 41 and the second electrode sheet 37. Since the material of the elastic sensor layer 91 of the embodiment is the same as that of the elastic layer 90 of Embodiment 3, a repeated description will be omitted.

[0112] By arranging the elastic sensor layer 91 between the second film foil 41 and the second electrode foil 37, the vibration noise of the vehicle can also be reduced.

[0113] By manufacturing the insulating film 36 from an elastically deformable material, the insulating film 36 can also serve as an elastic sensor layer. In this case, the sensitivity of the sensor 3 can be finely adjusted by increasing the number of parts. (Embodiment 7)

[0114] Next, the sensor-equipped seat 1 of Embodiment 7 will be described with reference to FIG. Fig. 14. This embodiment differs from Embodiment 2 in that, in the sensor-equipped seat 1 of the embodiment, the seat surface seat frame 111 includes a convex pressing part 111b.

[0115] As in the Fig. As shown in Figure 14, a convex pressing portion 111b is formed on an installation seat surface 111a of the seat base frame 111. The convex pressing portion 111b protrudes toward the second seat base seat cushion 15.

[0116] When the first seat base cushion 112 and the second seat base cushion 15 are installed on the installation seat surface 111a of the seat base frame 111, the convex pressing part 111b provided on the installation seat surface 111a presses the second seat base cushion 15. Accordingly, the second seat base cushion 15 can be reliably pre-compressed. This can increase the sensitivity of the sensor 3. (Embodiment 8)

[0117] Next, a sensor 303 of an embodiment 8 will be described with reference to the Fig. 15. The sensor 303 of the embodiment includes a first shielding layer 33 and a second shielding layer 38.

[0118] The first electrode foil 32 of the embodiment includes the first electrode layer 34 formed on one surface (the lower surface in the Fig. 15) is disposed opposite to the first surface 36a of the insulating film 36 under the first body part 32a formed by an insulating film. Furthermore, the first shielding layer 33 is laminated on a surface on the side opposite to the surface on which the first electrode layer 34 is formed in the first electrode film 32. The first shielding layer 33 is formed by a metal coil, a conductive fabric, a conductive film, and so on, which have a conductive property. Although not shown in detail, the first shielding layer 33 is grounded.

[0119] The second electrode foil 37 of the embodiment includes the second electrode layer 39 formed on one surface (the lower surface in the Fig. 15) is disposed opposite to the second surface 36b of the insulating film 36 under the second body part 37a formed by an insulating film. Furthermore, the second shielding layer 38 is formed on a surface on the side opposite to the surface on which the second electrode layer 39 is formed in the second electrode film 37. The second shielding layer 38 is formed by a metal coil, a conductive fabric, a conductive film, and so on, which have a conductive property. Although not shown in detail, the second shielding layer 38 is grounded.

[0120] The sensor 303 of the present embodiment is protected from electromagnetic interference from the top and bottom of the sensor 303 by the first shielding layer 33 and the second shielding layer 38. (Embodiment 9)9-1. Ventilation configuration of the sensor-equipped seat

[0121] Next, a sensor-equipped seat 401 of an embodiment 9 will be described with reference to FIG. Fig. 16 to 19. The Fig. Figure 16 shows the sensor-equipped seat 401 of the embodiment. In the following description, the directions "up-down," "front-back," and "left-right" refer to the directions "up-down," "front-back," and "left-right" as viewed from the seated person in the state where the seated person is sitting on the seat 401.

[0122] As in the Fig. 16, a seat bottom frame 411 includes a ventilation device 420. Although the ventilation device 420 is installed on a surface on a side opposite to an installation surface 411a on the seat bottom frame 411 in this embodiment, the installation position of the ventilation device 420 is not particularly limited, and the ventilation device 420 may also be installed on the installation surface 411a.

[0123] The ventilation device 420 is designed to direct the wind in the Fig. 16 upward or downward. Accordingly, the ventilation device 420 circulates air from the seat bottom frame 411 to a second seat bottom cushion 415, a first seat bottom cushion 412, and a seat bottom outer skin part 413. For example, a conventional configuration with a motor and a fan can be used as the ventilation device 420.

[0124] The seat surface seat frame 411 has a frame through hole 440 which is formed in the thickness direction (in the up-down direction of the Fig. 16) of the seat base frame 411. By using the ventilation device 420, the air is configured to circulate in the frame through-hole 440.

[0125] As in the Fig. 16, the second seat surface seat cushion 415 is in the direction in which the first seat surface seat cushion 412 and the second seat surface seat cushion 415 are layered (the direction from top to bottom in the Fig. 16, hereinafter referred to as the "layer direction") is provided with a second ventilation passage 450 penetrating the second seat surface cushion 415 at a location overlapping with the frame through-hole 440. The second seat surface cushion 415 may have one second ventilation passage 450, but may also have two or more second ventilation passages 450. As shown in the Fig. 17, in the embodiment, nine second ventilation passages 450 are formed on the second seat surface cushion 415. The second ventilation passage 450 penetrates the second seat surface cushion 415 in the layering direction (see Fig. 16).

[0126] As in the Fig. As shown in FIG. 17, the sensor 403 has a ventilation through-hole 405 that penetrates the sensor 403 in the layering direction at a position overlapping with the second ventilation through-hole 450 when projected in the layering direction. The internal shape of the ventilation through-hole 405 may be the same as or different from the internal shape of the second ventilation through-hole 450. The ventilation through-hole 405 of the embodiment is formed in the shape of an elongated hole. However, the shape of the ventilation through-hole 405 is not particularly limited, and any shape, such as a circular shape or an elongated rectangular shape, may be selected.

[0127] As in the Fig. As shown in FIG. 16, a first ventilation passage 460 penetrating the first seat surface cushion 412 in the layering direction is provided at a position overlapping with the second ventilation passage 450 in the layering direction in the first seat surface cushion 412. The first ventilation passage 460 penetrates the first seat surface cushion 415 in the layering direction. The ventilation passage hole 405 is formed at a position overlapping with the first ventilation passage 460 and the second ventilation passage 450 when projected in the layering direction.

[0128] As in the Fig. 18, in the embodiment, nine first ventilation passages 460 are formed on the first seat surface cushion 412. The first ventilation passage 460 penetrates the first seat surface cushion 415 in the layering direction. As shown in the Fig. 17 and Fig. As shown in FIG. 18, the first ventilation passage 460 and the second ventilation passage 450 are formed at an integrated position in the layering direction. However, it is also possible for the first ventilation passage 460 and the second ventilation passage 450 to be formed at substantially overlapping positions instead of being formed at the integrated position in the layering direction. The first seat surface seat cushion 412 is made of a foam material and therefore has a plurality of pores. Since it is possible for air to flow through the pores, it can also be configured so that air can flow between the first ventilation passage 460 and the second ventilation passage 450 even if the first ventilation passage 460 and the second ventilation passage 450 are not integrated in the layering direction.

[0129] As in the Fig. As shown in Figure 19, a seat surface outer skin part 413 has a skin through-hole 470 penetrating the seat surface outer skin part 413 in the layering direction. In the embodiment, it may be configured to form a plurality of skin through-holes 470 at intervals. The inner diameter of the skin through-hole 470 is smaller than the inner diameter of the first ventilation passage 460.

[0130] The skin passage hole 470 may also be formed at a position overlapping with the first ventilation passage 460 of the first seat surface cushion 412 in the layering direction. Accordingly, air can flow through the skin passage hole 470 and reach the upper surface of the seat surface outer skin part 413.

[0131] Furthermore, in the case where the skin through-hole 470 is formed near the first ventilation passage 460 of the first seat-surface cushion 412 in the layering direction, the skin through-hole 470 may also be formed at a position that does not overlap with the first ventilation passage 460. As described above, the first seat-surface cushion 412 is made of foam, etc. Therefore, a plurality of pores are present in the first seat-surface cushion 412. Accordingly, when air flows through the first ventilation passage 460, it can enter the outer skin part 413 of the seat surface through the pores. Accordingly, in the case where the skin passage hole 470 is formed near the first ventilation passage 460 of the first seat surface seat cushion 412, the air reaches the skin passage hole 470 by flowing in the pores and can pass over the seat surface outer skin part 413.

[0132] As in the Fig. As shown in FIG. 19, a plurality of skin through-holes 470 are formed in the seat surface outer skin part 413 in an area between two lateral suspension grooves 471a and behind a central suspension groove 471b, which will be described later. In other words, the skin through-holes 470 are located at positions near the backrest seat cushion 22 and are formed in areas corresponding to the buttocks of the seated person. However, the skin through-holes 470 may be formed at positions other than the positions corresponding to the buttocks of the seated person. The internal shape of the skin through-hole 470 may be circular, polygonal (for example, rectangular), and so on, and any shape can be selected accordingly. 9-2. Structure of the sensor 403

[0133] Hereinafter, regarding the structure of the sensor 403 of the present embodiment, a description will be given with reference to the Fig. 19 and Fig. 20. As in the Fig. As shown in Figure 17, the sensor 403 of the embodiment is rectangular in shape when viewed from above. However, any shape suitable for the shape of the sensor 403 can be selected. The sensor 403 includes a plurality of (four in the embodiment) detection areas 404. The detection area 404 detects the sitting state of the seated person or the biological information of the seated person. However, the number of detection areas 404 is not limited to four, but may be two, three, five, or more.

[0134] The detection area 404 of the embodiment has a rectangular shape when viewed from above. However, the shape of the detection area 404 is not limited to a rectangular shape. Any shape, for example, a polygonal shape such as a triangular shape or a pentagonal shape, can be selected appropriately. The four detection areas 404 are arranged to be spaced apart from each other at intervals at the four corners of the rectangular sensor 403.

[0135] A conductive pattern (not shown) is formed in the sensor 403 in an area between the detection areas 404. The conductive pattern electrically connects the detection areas 404 and the outside of the sensor 403.

[0136] As in the Fig. 17, the four detection areas 404 are a left rear detection area 404a arranged at the left rear part of the sensor 403 to detect the state of the left buttock of the seated person, a right rear detection area 404b arranged at the right rear part of the sensor 403 to detect the state of the right buttock of the seated person, a left front detection area 404c arranged at the left front part of the sensor 403 to detect the state of the left leg of the seated person, and a right front detection area 404d arranged at the right front part of the sensor 403 to detect the state of the right leg of the seated person.In the following description, with respect to the common configuration of the four detection areas 404, the description may be made using the term “detection area 404” without distinguishing the four detection areas 404.

[0137] The sensor 403 includes a rear ventilation through-hole 405a between the left rear detection area 404a and the right rear detection area 404b. The sensor 403 includes a left ventilation through-hole 405b between the left front detection area 404c and the left rear detection area 404a. The sensor 403 includes a right ventilation through-hole 405c between the right front detection area 404d and the right rear detection area 404b.

[0138] As in the Fig. 19, the rear ventilation through-hole 405a is arranged at a position overlapping with the skin through-hole 470 in the layering direction.

[0139] Meanwhile, the left ventilation through-hole 405b and the right ventilation through-hole 405c are arranged at positions that do not overlap with the skin through-holes 470 in the layering direction and are arranged near the skin through-holes 470.

[0140] Note that the conductive pattern is shaped to avoid portions where the rear ventilation through-hole 405a, the left ventilation through-hole 405b, and the right ventilation through-hole 405c are formed.

[0141] The Fig. Figure 20 shows the cross-sectional structure of a detection region. In the embodiment, the four detection regions 404 have the same configuration. A second insulating film sheet 441, a second electrode sheet 437, an insulating film 436, a first electrode sheet 432, and a first insulating film sheet 430 are layered in the detection region 404.

[0142] The second electrode foil 437 has a second body portion 437a that is insulating. A second shielding layer 438 that is conductive is laminated on the surface on the side of the second film sheet 441 in the second body portion 437a. A second electrode layer 439 that is conductive is laminated on the surface on the side of the insulating film 436 in the second body portion 437a. The second electrode layer 439 is formed by a plurality of electrode groups.

[0143] The first electrode foil 432 has a first body portion 432a that is insulating. A first shielding layer 433 that is conductive is laminated on the surface on the side of the first film sheet 430 in the first body portion 432a. A first electrode layer 434 that is conductive is laminated on the surface on the side of the insulating film 436 in the first body portion 432a. The first electrode layer 434 is formed by an electrode.

[0144] However, the configuration of the detection area 404 is not limited to the above, and any configuration may be selected. 9-3. Suspension structure of the seat outer skin part 413

[0145] In the following, with respect to the suspension structure of the seat surface outer skin part 413, a description will be given with reference to the Fig. 17, Fig. 18, Fig. 19, Fig. 21. As in the Fig. As shown in FIG. 19, on the upper surface of the seat surface outer skin part 413, at portions near two side parts in the left-right direction, two lateral suspension grooves 471a extending in the front-rear direction are formed. The lateral suspension groove 471a is formed to extend from the rear end to the front end of the seat surface outer skin part 413. In the lateral suspension groove 471a, the end of the seat surface outer skin part 413 is folded into the side of the first seat surface seat cushion 412.

[0146] As in the Fig. 19, a central suspension groove 471b is formed on the upper surface of the seat surface outer skin part 413. The central suspension groove 471b is located near the substantial center in the front-rear direction and connects the two lateral suspension grooves 471a. As shown in the Fig. 21, the end of the seat surface outer skin part 413 is folded into the side of the first seat surface seat cushion 412 in the central suspension groove 471b.

[0147] As in the Fig. 18, two side receiving grooves 462a and one central receiving groove 462b for receiving the folded ends of the seat surface skin part 413 are formed on the upper surface of the first seat surface cushion 412 at positions corresponding to the two side suspension grooves 471a and the central suspension groove 471b.

[0148] In each of the two lateral receiving grooves 462a, two first suspension through-holes 461a are formed, spaced apart from each other in the front-rear direction, and suspend the ends of the seat surface skin part 413 to penetrate the first seat surface cushion 412 in the layering direction (up-down direction). The first suspension through-hole 461a formed in the lateral receiving groove 462a is formed in an elongated oval shape that is thin and long in the front-rear direction. The number of first suspension through-holes 461a formed in the lateral receiving groove 462a may also be one, three, or more.

[0149] Two first suspension through-holes 461b are formed in the central receiving groove 462b, spaced apart from each other in the left-right direction, and suspend the ends of the seat surface skin member 413 to penetrate the first seat surface cushion 412 in the layering direction (up-down direction). The first suspension through-hole 461b formed in the central receiving groove 462b is formed in an elongated oval shape that is thin and long in the left-right direction. The number of first suspension through-holes 461b formed in the central receiving groove 462b may also be one, three, or more.

[0150] However, the shapes of the first suspension through-holes 461a, 461b are not limited to the elongated hole shape, and any shape such as a circular shape, an elongated rectangular shape, and so on can be selected.

[0151] As in the Fig. 21, the end of the outer skin part 413 is inserted into the first suspension through hole 461b from above.

[0152] As in the Fig. 18, the first suspension through-holes 461b formed in the central receiving groove 462b are formed at positions overlapping with the left ventilation through-hole 405b and the right ventilation through-hole 405c of the sensor 403 when projected in the layer direction.

[0153] As in the Fig. As shown in Fig. 21, a second suspension through-hole 451 for suspending the skin is formed in the second seat-surface seat cushion 415 so as to penetrate the second seat-surface seat cushion 412 in the layering direction (up-down direction) at a position overlapping with the first suspension through-hole 461b when projected in the layering direction. A support member 421 to be described later is inserted into the second suspension through-hole 451.

[0154] As in the Fig. As shown in Figure 17, the second suspension through-hole 451 is formed in the shape of an elongated hole that is thin and long in the left-right direction. However, the shape of the second suspension through-hole 451 is not limited to the elongated hole shape, and any shape, such as a circular shape, an elongated rectangular shape, and so on, can be appropriately selected.

[0155] As in the Fig. As shown in FIG. 21, the seat bottom frame 411 includes the frame through-hole 440, which penetrates the seat bottom frame 411 in the stacking direction at a position overlapping with the second suspension through-hole 451 when projected in the stacking direction. By using the ventilation device 420, air is configured to circulate in the frame through-hole 440.

[0156] With reference to the Fig. 21, the suspension structure of the seat surface skin part 413 is described. A skin-side locking member 421a is attached to one end of the seat surface skin part 413, which is folded into the first suspension through-hole 461b of the first seat surface cushion 412. The skin-side locking member 421a fixes the end of the seat surface skin part 413 and one end of the support member 421. The shape of the skin-side locking member 421a is not particularly limited, and any shape, such as a ring shape or a hook shape, can be adopted.

[0157] The support member 421 is elongated in the layering direction. The support member 421 may be a metal rod, a metal plate, a metal wire, a synthetic resin member, a synthetic resin wire, and so on, and is not particularly limited. In this embodiment, a metal wire is used as the support member 421.

[0158] As in the Fig. As shown in Fig. 21, the support member 421 is inserted into the ventilation through-hole 405 of the sensor 403 and the second suspension through-hole 451 of the second seat bottom seat cushion 415. A frame-side locking member 421b is fixed to the other end of the support member 421. The shape of the frame-side locking member 421b is not particularly limited, and any shape, such as a ring shape or a hook shape, can be selected. The frame-side locking member 421b is inserted into the frame through-hole 440 of the seat bottom seat frame 411 and fixed to the seat bottom seat frame 411 in the frame through-hole 440. 9-4. Effects of the embodiment

[0159] The sensor 403 of the embodiment has the ventilation through-hole 405. Accordingly, even if the sensor 403 is arranged between the first seat surface cushion 412 and the second seat surface cushion 415, air can flow between the first seat surface cushion 412 and the second seat surface cushion 415 via the ventilation through-hole 405. As a result, when the ventilation device 420 is used, the air can be blown to the seated person's buttocks through the frame through-hole 440, the second ventilation through-hole 450, the ventilation through-hole 405, the first ventilation through-hole 460, and the skin through-hole 470. Accordingly, the stuffiness caused by the seated person's perspiration between the seated person's buttocks and the seat surface outer skin part 413 can be suppressed.

[0160] According to the embodiment, the support member 421 can be fixed to the seat base frame 411 when the support member 421 is attached to the end of the seat base outer skin part 413 inserted into the ventilation hole 405 formed in the sensor 403. Accordingly, even in the case where the sensor 403 is arranged between the first seat base cushion 412 and the second seat base cushion 415, the end of the seat base outer skin part 413 can be suspended in the first seat base cushion 412. Accordingly, the positional deviation of the seat base outer skin part 413 is suppressed, and the designability of the seat base outer skin part 413 can be facilitated.

[0161] Furthermore, since the seat base outer skin part 413 is fixed in a state suspended from the seat base frame 411 via the support member 421, the seat base outer skin part 413 is in a state of being pulled toward the first seat base cushion 412 and the second seat base cushion 415. Accordingly, pre-compression is applied to the sensor 403 located between the first seat base cushion 412 and the second seat base cushion 415. This can increase the sensitivity of the sensor 403.

[0162] Furthermore, the ventilation through-hole 405 of the sensor 403 is formed at a position that overlaps with the first suspension through-hole 461b of the first seat-surface cushion 412 and the second ventilation through-hole 451b of the second seat-surface cushion 415 when projected in the layering direction. Therefore, by using the ventilation device 420, air can flow from the second seat-surface cushion 415 side to the first seat-surface cushion 412 side. Accordingly, the stuffiness between the seated person's buttocks and the seat-surface outer skin part 413 can be suppressed.

[0163] Furthermore, according to the embodiment, the ventilation through-hole 405 can have both the function of generating airflow and the function of inserting the support member 421, and the number of through-holes provided in the sensor 403 can be reduced. Accordingly, the degree of freedom for designing the conductive pattern formed in the sensor 403 can be increased. (Embodiment 10)

[0164] Next, a sensor-equipped seat 501 of an embodiment 9 will be described with reference to FIG. Fig.22. The sensor-equipped seat 501 of the embodiment includes a front sensor 503a located at the front and a rear sensor 503b located at the rear. The front sensor 503a and the rear sensor 503b are spaced apart in the front-rear direction. However, the number of sensors is not limited to two, but may be three or more.

[0165] A front second seat cushion 515a (an example of a second cushion) is arranged below the front sensor 503a. Furthermore, a rear second seat cushion 515b (an example of a second cushion) is arranged below the rear sensor 503b. However, it is sufficient if the second cushion is arranged at a position below the sensor. Therefore, the number of second cushions is not limited to two, but may be three or more.

[0166] The elastic modulus of the front second seat bottom cushion 515a can be the same as or different from the elastic modulus of the rear second seat bottom cushion 515b. By making the elastic modulus of the front second seat bottom cushion 515a different from that of the rear second seat bottom cushion 515b, the pre-compression applied to the front sensor 503a and the rear sensor 503b can be different. Accordingly, the sensitivities of the front sensor 503a and the rear sensor 503b can be adjusted.

[0167] The material of the front second seat cushion 515a and the material of the rear second seat cushion 515b can be the same or different. If the material of the front second seat cushion 515a and the material of the rear second seat cushion 515b are the same, the elastic moduli can be different, for example, by using different foam rates.

[0168] The disclosure is not limited to the above-mentioned embodiments, but can be applied to various embodiments without departing from the gist of the matter.

Claims

[1] A seat (1) equipped with a sensor (3), comprising: an installation element (11) having an installation seat surface (11a); a seat cushion (10) which is a seat cushion attached to the installation seat surface of the installation member, and comprising: a first cushion (12) having a concave receiving portion (80) open to one side of the installation member in a back pressure receiving surface (12b) located on a back side of a pressure receiving surface (12a) that receives a pressure from a seated person; and a second cushion (15) accommodated in the concave receiving portion (80) of the first cushion (12) to be layered on the first cushion (12); and a sensor (3) arranged between a first pressure surface (82b) located on a side opposite to a direction in which the concave receiving portion of the first cushion (12) is open in the concave receiving portion and a second pressure surface (15a) located on a side opposite to the installation member in the second cushion (15), and which detects a sitting state of the seated person or biological information of the seated person by detecting a physical quantity in accordance with a pressure transmitted from the pressure receiving surface of the seat cushion (10) via the first cushion (12) in the sitting state by the seated person, and which has a flexible property, wherein the seat cushion (10) is installed on the installation seat surface of the installation member, and in a non-seated state, before the seated person sits on the seat cushion (10), the first cushion (12) and the second cushion (15) are pre-compressed in a layering direction in which the first cushion (12) and the second cushion (15) are layered, and the sensor (3) is subjected to pre-compression by a compression reaction force of the first cushion (12) and the second cushion (15). [2] The seat (1) equipped with a sensor (3) according to claim 1, wherein the elastic modulus of the second cushion (15) is different from that of the first cushion (12). [3] The sensor (3)-equipped seat (1) according to claim 1 or 2, wherein, in a state before the seat cushion (10) is installed on the installation member, a sum (b) of a thickness dimension of the second cushion (15) and a thickness dimension of the sensor (3) in the layering direction is set to be larger than a depth dimension (a) of the concave receiving portion (80) of the first cushion (12) in the layering direction. [4] The seat (1) equipped with a sensor (3) according to claim 3, wherein in the non-seated state, the back pressure receiving surface (12b) of the first cushion (12) and a surface (15b) facing the installation seat surface (11a) in the second cushion (15) are flush. [5] The seat (1) equipped with a sensor (3) according to one of claims 1 to 4, wherein the installation element (11) comprises: a convex pressing part (111b) protruding toward the second cushion (15) at a position corresponding to the second cushion (15) in the installation seat surface (11a). [6] The sensor (3)-equipped seat (1) according to any one of claims 1 to 5, wherein a gap is formed between an inner side surface of the concave receiving portion (80) of the first cushion (12) and an outer side surface of the second cushion (15). [7] The seat (1) equipped with a sensor (3) according to one of claims 1 to 6, wherein the sensor (3) comprises: a pressure detection surface (31) located on a side opposite to the second pad (15) in a state in which it is arranged between the first pressure surface (82b) of the first pad (12) and the second pressure surface (15a) of the second pad (15), and which directly or indirectly receives a pressure from the first pressure surface (82b) of the first pad (12), and the first pad (12) comprises: a convex part (82a) protruding from a lower part (82) of the concave receiving portion (80) toward the sensor (3) and contacting the pressure detection surface (31) to be pre-compressed in the unseated state, wherein a tip end of the convex part (82a) is arranged as the first pressure surface (82b) and a pre-compression amount with respect to the pressure detection surface (31) is set to be larger than a pre-compression amount with respect to a vicinity of the pressure detection surface (31). [8] The seat (1) equipped with a sensor (3) according to claim 7, wherein the first cushion (12) further comprises: a recessed groove (82c) formed at the lower part of the concave receiving portion (80) and along an edge of the convex part (82a) and separating an outer side surface of the convex part (82a) and an inner side surface (81) of the concave receiving portion (80). [9] The seat (1) equipped with a sensor (3) according to one of claims 1 to 8, comprising an elastic layer (90) between the first cushion (12) and the sensor (3) or between the second cushion (15) and the sensor (3), wherein the elastic layer (90) is elastically deformable. [10] The sensor (3)-equipped seat (1) according to claim 9, wherein, in a state before the seat cushion (10) is installed on the installation member (11), a sum (b) of a thickness dimension of the second cushion (15), a thickness dimension of the sensor (3), and a thickness dimension of the elastic layer (90) in the layering direction is set to be larger than a depth dimension (a) of the concave receiving portion (80) of the first cushion (12) in the layering direction. [11] The seat (1) equipped with a sensor (3) according to claim 9 or 10, wherein the elastic layer (90) is arranged between the first cushion (12) and the sensor (3), the sensor (3) comprises: a pressure detection surface (31) arranged in a state between the first pressure surface (82b) of the first pad (12) and the second pressure surface (15a) of the second pad (15), arranged on a side opposite to the second pad (15), and directly or indirectly receiving a pressure from the first pressure surface (82b) of the first pad (12), the elastic layer (90) contacts the pressure detection surface (31), an area of ​​the elastic layer (90) is equal to or smaller than an area of ​​the pressure detection surface (31), and, in the non-seated state, a A pre-compression amount with respect to the pressure detection area (31) is set to be greater than a pre-compression amount with respect to a surrounding of the pressure detection area (31). [12] The seat (1) equipped with a sensor (3) according to any one of claims 1 to 11, wherein the first cushion (12) is covered by a skin (13) made of a material that is less contractible than the first cushion (12). [13] The seat (1) equipped with a sensor (3) according to one of claims 1 to 12, wherein the sensor (3) comprises: an insulating film (36) having an insulating property and provided with a first surface (36a) and a second surface (36b); a first electrode foil (32) laminated on the first surface of the insulating foil (36) and having a first electrode layer (34); a first film foil (30) having an insulating property and covering the first electrode foil (32); a second electrode foil (37) laminated on the second surface of the insulating foil (36) and having a second electrode layer (39); and a second film foil (41) having an insulating property and covering the second electrode foil (37), wherein, in a state in which the sensor (3) is arranged in the concave receiving portion (80), the first film sheet (30) is arranged near the first printing surface (82b) and the second film sheet (41) is arranged near the second printing surface (15a), and the sensor (3) comprises an elastic sensor layer (91) which is elastically deformable. [14] The seat (1) equipped with a sensor (3) according to claim 13, wherein the elastic sensor layer (91) is arranged at least one of between the first electrode layer (34) and the first film sheet (30) and between the second electrode layer (39) and the second film sheet (41). [15] The seat (1) equipped with a sensor (3) according to claim 13, wherein the elastic sensor layer (91) is the insulating film (36). [16] The seat (1) equipped with a sensor (3) according to claim 13, wherein the first electrode foil (32) comprises: a first body part (32a) having an insulating property; the first electrode layer (34) laminated on a surface opposite to the first surface of the insulating film (36) in the first body part (32a); and a first shielding layer (33) in the first body part (32a) which is layered on a surface on a side opposite to the first electrode layer (34), and the second electrode foil (37) comprises: a second body part (37a) having an insulating property; the second electrode layer (39), in the second body part (37a), laminated on a surface facing the second surface of the insulating film (36); and a second shielding layer (38) laminated on a surface opposite to the second electrode layer (39) in the second body part (37a). [17] The seat (1) equipped with a sensor (3) according to any one of claims 1 to 16, wherein the seat (1) equipped with a sensor (3) further comprises: a ventilation device (420) which causes an air flow with respect to the first cushion (12) and the second cushion (15) in the layer direction, wherein the first cushion (12) comprises: a first ventilation passage (460) penetrating the first cushion (12) in the layer direction, the second cushion (15) comprises: a second ventilation passage (450) penetrating the second cushion (15) in the layer direction, the first ventilation passage (460) and the second ventilation passage (450) are formed at positions overlapping in the layer direction, and the sensor (3) has a ventilation through-hole (405a) at a position overlapping with the first ventilation passage (460) and the second ventilation passage (450) when projected in the layer direction, the ventilation through-hole (405a) passing through the sensor (3). [18] The seat (1) equipped with a sensor (3) according to claim 17, wherein the sensor (3) has a plurality of detection areas (404, 404a, 404b, 404c, 404d) which detect the sitting state of the seated person or biological information of the seated person, and the detection areas (404, 404a, 404b, 404c, 404d) are arranged so that they are spaced apart from each other at intervals, and the ventilation through-hole (405a) is formed between adjacent detection areas from the detection areas (404, 404a, 404b, 404c, 404d). [19] The seat (1) equipped with a sensor (3) according to claim 17 or 18, wherein the first cushion (12) is covered by a skin (413) made of a material that is less contractible than the first cushion (12), in the first cushion (12) a first suspension through-hole (461b) for suspending the skin (413) is formed by penetrating it in the layer direction, in the second cushion (15), a second ventilation through-hole (451) for suspending the skin (413) by penetrating in the layering direction is formed at a position overlapping with the first suspension through-hole (461b) when projected in the layering direction, a support member (421) supporting the suspended skin (413) within the first suspension through-hole (461b) and the second ventilation through-hole (451) is arranged, and Ventilation holes (405b, 405c) are formed at positions that coincide with the first suspension through-hole (461b) and the second ventilation through-hole (451) overlap when projected in the layer direction. [20] The sensor (3)-equipped seat (1) according to claim 19, wherein the support member (421) has an elongated shape in the layering direction, one end of the support member (421) is fixed to the skin (413) and another end of the support member (421) is fixed to the installation member (11), and when the skin (413) is pulled by the support member (421) toward the installation member (11), the first cushion (12) and the second cushion (15) are pre-compressed in the layering direction. [21] The seat (1) equipped with a sensor (3) according to any one of claims 1 to 20, wherein the seat (1) equipped with a sensor (3) further comprises: a plurality of sensors (503a, 503b); and a plurality of second pads (515a, 515b) arranged at positions overlapping with the sensors (503a, 503b) in the layer direction. [22] The seat (1) equipped with a sensor (3) according to claim 21, wherein the elastic modulus of at least one of the second cushions (515a, 515b) is different from the elastic modulus of another of the second cushions (515a, 515b).

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