JP2023160510A - Occupant protection device - Google Patents

Abstract

To provide an occupant protection device which achieves improvement of protection performance of an occupant seated on a seat.SOLUTION: An occupant protection device is provided at a seat 1 having a seating surface part 20 on which a thigh F and a hip B are placed and a backrest part 30 which contacts with a back of an occupant. The occupant protection device includes: a tether part 50 which is provided spanning between a front part of the seating surface part and an upper part of the backrest part at a side part of the seat; a bag part 60 which is provided at the tether part and deployed by a deployment gas being introduced thereto; collision detection parts 101, 200 which detect or predict a collision of a vehicle; and an occupant protection control unit 100 which causes the tether part to generate tensile force and causes the bag part to deploy according to the detection or the prediction of the collision detected by the collision detection parts. The bag part is arranged to overlap with the tether part when viewed from the side surface side of the occupant.SELECTED DRAWING: Figure 3

Description

The present invention relates to an occupant protection device for protecting an occupant seated on a seat.

As a technology related to occupant protection in vehicles such as automobiles, for example, Patent Document 1 discloses that in the event of a collision, the backrest of the seat is protected from behind by a tightening belt extending from the top of the backrest to the front of the seat cushion. An impact protection device is described that prevents a falling movement. It is stated that the backrest is held in position by means of a tightening belt, and that the protective element positioned next to the seat by means of the tightening belt is oriented and fixed even in the event of a collision. It is also described that an airbag is provided in the capture net, which is a protective element.
Patent Document 2 discloses that when a rear collision occurs, the inner buckle of the seat belt is retracted and tension is generated in both the shoulder belt and the lap belt of the seat belt, thereby reducing the shear of the occupant when a rear collision occurs at a relatively high relative speed. It is stated that rising behavior is suppressed.

Japanese Patent Application Publication No. 10-71883 Japanese Patent Application Publication No. 2001-322532

In a rear-end collision in which a vehicle is hit from behind an occupant, the occupant is strongly pressed against the backrest portion of the seat. If the energy of the collision is high, the occupant will try to push the backrest of the seat further.
However, there is a limit to the amount by which the backrest can be pushed rearward due to the structure of the seat. After reaching the limit, the backrest section tends to fall backwards, and the occupant slides upward and diagonally rearward along the inclination of the backrest section.
Such upward movement causes the occupant's head and neck to separate from the headrest, which is a safety device that reduces injury to the occupant in the event of a rear-end collision.
If the occupant's head and neck detach from the headrest, there is concern that injuries to the neck and brain stem may worsen.

Although it is recognized that the technique described in Patent Document 1 has the effect of suppressing the backward tilting behavior of the backrest part by connecting the upper part of the backrest part and the front end of the seat part with a tightening belt, In order to reliably prevent injury to occupants from worsening, it is desired to more effectively restrain the backward tilting behavior of the backrest portion.
Further, in this technique, the airbag is held by a trapping net, but it is difficult to generate a reaction force when a load is input to the airbag by such a trapping net.
Furthermore, when the occupant is restrained depending on the tension of the seat belt as in the technique described in Patent Document 2, there is a concern that the occupant may be injured due to pressure from the seat belt.
In view of the above-mentioned problems, an object of the present invention is to provide an occupant protection device with improved protection performance for an occupant seated on a seat.

In order to solve the above-mentioned problems, an occupant protection device according to one aspect of the present invention includes a seat portion on which the thighs and buttocks of the occupant are placed, and a seat portion that extends upward from the rear portion of the seat portion, An occupant protection device provided on a seat having a backrest portion in contact with a back portion, the tether portion being provided across a side portion of the seat between a front portion of the seat surface portion and an upper portion of the backrest portion. a bag section that is provided in the tether section and is deployed by introducing deployment gas; a collision detection section that detects or predicts a collision of a vehicle; , an occupant protection control section that generates tension in the tether section and deploys the bag section, the bag section being arranged to overlap with the tether section when viewed from a side of the occupant. It is characterized by
According to this, in the event of a rear-end collision in which the occupant is hit from behind, the tether section is stretched between the front part of the seat part and the upper part of the backrest part, so that the tether part It is possible to suppress the inclination to As a result, it is possible to prevent the occupant's upper body from sliding up along the slope of the backrest portion, and the injury to the occupant from worsening due to the occupant's head and neck climbing over the headrest and the like.
Further, in the event of a side collision in which the occupant is hit from the side, the reaction force of the bag portion is received by the tether portion, so that the impact energy can be effectively absorbed by the bag portion.
In addition, the tether and bag section stably press the occupant's body from the shoulder area to the thigh area on the side opposite to the side that was hit by the collision, causing the occupant's body to shift laterally, thereby preventing the occupant from entering the side door. It is possible to suppress injuries to occupants due to deformation of the passenger compartment, such as deformation of pillars and pillars.

In the present invention, the bag portion may be configured to be deployed toward the passenger with respect to a line of action of tension in the tether portion.
According to this, when the bag part is deployed, the middle part of the tether part bends or curves in a direction that extends outward when viewed from the passenger, further increasing the tension of the tether part and causing the backrest part to tilt backward. The prevention effect can be further enhanced.

In the present invention, the tether portion and the bag portion are arranged or stored along the sides of the seat portion and the backrest portion in a normal state where the collision is not detected or predicted. It can be configured as follows.
According to this, during normal use of the vehicle (non-collision), the tether portion and the bag portion do not impair usability such as the ease of getting on and off the vehicle or the comfort of the occupants, improving the convenience and comfort of the vehicle. be able to.

In the present invention, the tether portion and the bag portion may be provided at least on an outer side portion of the seat in the vehicle width direction.
According to this, in the event of a so-called near-side side collision in which a collision occurs from a side surface of the vehicle body closer to the seat, the occupant can be pushed inward in the vehicle width direction by the tether portion and the bag portion, thereby suppressing harm to the occupant.

In the present invention, the occupant protection control section includes a collision mode determining section that determines the mode of the collision, and the occupant protection control section generates tension in the tether section and then deploys the bag section in response to detection or prediction of a rear collision. In addition, the bag portion may be deployed in response to detection or prediction of a side collision, and then tension may be generated in the tether portion.
According to this, in the event of a rear-end collision, the backward tilting behavior of the backrest is restrained by first generating tension in the tether, and then by deploying the bag, the tension in the tether is further increased and the backrest is restrained. It is possible to effectively suppress the occupant from climbing up due to the inclination of the part.
On the other hand, in the event of a side collision, by deploying the bag first and then generating tension in the tether, the bag can be deployed reliably even in a narrow space surrounded by interior parts of the vehicle, and then the tether By generating tension in the vehicle, the occupant can be pushed laterally and moved.

As described above, according to the present invention, it is possible to provide an occupant protection device with improved protection performance for an occupant seated on a seat.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a side view of a vehicle seat provided with a first embodiment of an occupant protection device to which the present invention is applied, and is a diagram showing a normal state (non-collision state). FIG. 1 is a block diagram schematically showing a system configuration of an occupant protection device according to a first embodiment. FIG. 2 is a schematic diagram showing a state in which a vehicle seat provided with the occupant protection device of the first embodiment is viewed from the side, and shows a state at the time of deployment (at the time of collision). FIG. 4 is a view taken along the line IV-IV in FIG. 3; FIG. 3 is a schematic diagram showing a state in which a vehicle seat provided with a second embodiment of the occupant protection device to which the present invention is applied is viewed from the side, and shows a state in a deployed state (at the time of a collision). FIG. 7 is a schematic diagram showing a state in which a vehicle seat provided with a third embodiment of the occupant protection device to which the present invention is applied is viewed from the side, and shows a state in a deployed state (at the time of a collision). FIG. 3 is a block diagram schematically showing a system configuration of a fourth embodiment of an occupant protection device to which the present invention is applied.

<First embodiment>
Hereinafter, a first embodiment of an occupant protection device to which the present invention is applied will be described.
The occupant protection device of the first embodiment is provided, for example, on a seat provided in the interior of a vehicle such as a passenger car, and protects an occupant seated on the seat in the event of a collision.
FIG. 1 is a schematic diagram showing a side view of a vehicle seat provided with an occupant protection device according to a first embodiment, and is a diagram showing a normal state (non-collision state).

As shown in FIG. 1, the occupant P has a head H, an upper body UB, arms A, legs L, thighs F, buttocks B, and the like.
As an example, it is assumed that the occupant P is seated with the front of the upper body UB facing the front side of the vehicle.
The seat 1 includes a base portion 10, a seat cushion 20, a backrest 30, a headrest 40, and the like.
The base portion 10 is a base provided at the bottom of the seat 1.
The base portion 10 is attached to a floor panel (not shown) constituting a floor portion of a vehicle interior via a seat rail (not shown) so as to be slidable in the front-rear direction.

The seat cushion 20 is a seat surface on which the buttocks B and thighs F of the occupant P are placed.
The seat cushion 20 is attached to the upper part of the base portion 10.
The seat cushion 20 has an upper surface portion extending along the front-rear direction and the shoulder width direction of the occupant P.
The lower limb portion of the leg L of the occupant P is thrown forward from the front end of the seat cushion 20.

The backrest 30 is a backrest portion provided to face the back of the occupant's P's upper body UB.
The backrest 30 extends upward and diagonally rearward from near the rear end of the seat cushion 20.
The upper end of the backrest 30 is located behind the shoulders of the occupant P during normal use of the vehicle.

The headrest 40 is provided on the rear side of the head H of the occupant P, and is a portion that restrains the head H when the head H rotates in a rearward tilting direction with respect to the seat 1.
The headrest 40 is provided to protrude upward from the upper end of the backrest 30.
The seat cushion 20, the backrest 30, and the headrest 40 each have a frame made of a metal material such as steel, and an elastic material such as porous urethane foam is provided around the frame to provide shock absorption (cushion). It is configured to have the following characteristics.

The seat 1 also includes a tether 50, a side airbag 60, a deployment device 70, and the like, which cooperate with an airbag control unit 100 and the like to be described later to constitute the occupant protection device of the first embodiment.
The tether 50 is configured by a band-shaped webbing made of a woven polyester fiber, for example.
One end 51 of the tether 50 is connected to a side of the seat cushion 20 near the front end.
The other end 52 of tether 50 is connected to deployment device 70 .
During normal use of the vehicle (undeployed), the intermediate portion 53 of the tether 50 extends rearward from the end portion 51 along the sides of the seat cushion 20, and extends upward near the rear end of the seat cushion 20. It is folded back to the side and extends along the side of the backrest 30 to near the upper end of the backrest 30.
The intermediate portion 53 is folded back downward again near the upper end of the backrest 30 and reaches the end portion 52 .
The intermediate portion 53 is housed inside the seat skin (not shown) at the sides of the seat cushion 20 and the backrest 30 when the intermediate portion 53 is not expanded.

The side airbag 60 is formed by sewing a base fabric panel made of, for example, nylon fiber fabric into a bag shape.
The side airbag 60 is attached to the surface of the intermediate portion 53 of the tether 50 on the occupant P side.
When not inflated, the side airbag 60 is housed in a folded state together with the intermediate portion 53 of the tether 50, for example, on the side of the backrest 30, inside the seat skin.

The deployment device 70 deploys the side airbag 60 and tows the tether 50 in response to detection of a vehicle collision (establishment of a collision determination) or prediction of a collision (establishment of a pre-crash determination). This generates tension.
The deployment device 70 has a rotatable bobbin (not shown), and the end portion 52 of the tether 50 is wound around the bobbin.
As a mechanism for pulling the tether 50, for example, a configuration similar to a chemical-type seatbelt pretensioner can be applied.
The deployment device 70 is provided with a side airbag gas generator 130, which will be described later, for towing the tether 50 and deploying the side airbag 60.
The behavior of the tether 50 and the side airbag 60 when the deployment device 70 is activated will be described in detail later.

FIG. 2 is a block diagram schematically showing the system configuration of the occupant protection device according to the first embodiment.
The vehicle of the first embodiment includes an airbag control unit 100 and an environment recognition unit 200.
The airbag control unit 100 controls the deployment of various airbags provided in the vehicle and the traction of the tether 50 in response to a vehicle collision or detection of a sign of a collision.
The environment recognition unit 200 recognizes the environment around the vehicle based on the outputs of various sensors.
The airbag control unit 100 and the environment recognition unit 200 include, for example, an information processing section such as a CPU, a storage section such as a RAM or ROM, an input/output interface, a bus connecting these, and the like.
The airbag control unit 100 and the environment recognition unit 200 can communicate directly, for example, via an in-vehicle LAN such as a CAN communication system.

The airbag control unit 100 is an occupant protection control section that controls the operation of each gas generator provided in the occupant protection device in response to detection or prediction of a collision.
Airbag control unit 100 has a collision sensor 101.
The collision sensor 101 is a collision detection unit that includes an acceleration sensor that detects acceleration acting on the vehicle body in the longitudinal direction, the vehicle width direction, and the like.
When the collision sensor 101 detects a significant acceleration peculiar to the time of a collision, the airbag control unit 100 establishes a collision determination (detects a collision), determines the manner of the collision, and determines the deployment of the corresponding airbag. do.
Examples of collision modes include a frontal collision in which the vehicle is collided from the front, a rear collision in which the vehicle is collided from behind (typically a rear-end collision), and a side collision in which the vehicle is collided from the side.
These collision modes can be determined based on the direction of the main acceleration detected by the collision sensor 101.

The airbag control unit 100 has a function of giving operation commands to a frontal collision airbag gas generator 110, a curtain airbag gas generator 120, and a side airbag gas generator 130 to start generating gas for deployment. have
Each gas generator (inflator) generates gas for deployment using, for example, chemical powder (gunpowder).
The front collision airbag gas generator 110 supplies deployment gas to, for example, a driver's airbag that deploys from a center pad of a steering wheel, a passenger airbag that deploys from the front of an instrument panel, and the like.
The curtain airbag gas generator 120 supplies deployment gas to a curtain airbag deployed along the side door glass from the top of the side door glass of the vehicle interior.

The side airbag gas generator 130 is provided in the above-described deployment device 70 and supplies deployment gas to the side airbag 60 via a gas supply channel (not shown).
Further, a portion of the deployment gas generated by the side airbag gas generator 130 is used as power for rotating the bobbin around which the end 52 of the tether 50 is wound.

A visible light camera device 210, a millimeter wave radar device 220, a laser scanner device 230, and the like are connected to the environment recognition unit 200.
The visible light camera device 210 is an imaging device that images the surroundings (front, rear, side, etc.) of the own vehicle using a visible light camera such as a stereo camera or a single camera.
The visible light camera device 210 has a function of performing image processing on a captured image and detecting the presence or absence of an object around the host vehicle, the relative position and speed of the object with respect to the host vehicle, the shape of the lane, and the like.
The millimeter wave radar device 220 is a radar device that uses radio waves in a frequency band of 30 to 300 GHz, for example, and has a function of detecting the presence or absence of an object and the relative position of the object with respect to the host vehicle.
The laser scanner device 230 scans the surroundings of the vehicle by emitting pulsed near-infrared laser light, for example, and determines the presence or absence of an object and the relative relationship of the object to the vehicle based on the presence or absence of reflected light and the time difference until the reflected light returns. It has the ability to detect the position, shape of an object, etc.
The environment recognition unit 200 makes a pre-crash determination (collision prediction) based on the outputs of these sensors, for example, when a collision with an object such as another vehicle is unavoidable.
When the pre-crash determination is established, the environment recognition unit 200 determines the collision mode (frontal collision, rear collision, side collision, etc.) based on the outputs of each sensor.
The environment recognition unit 200 functions as another collision detection section of the present invention.

If a collision determination is made based on the output of the collision sensor 101 and it is determined that the collision is a rear collision or a side collision, or if the environment recognition unit 200 makes a pre-crash determination, If it is determined that the collision is a rear collision or a side collision, an activation command is given to the side airbag gas generator 130 to start generating gas for deployment.
As a result, the deployment device 70 deploys the side airbag 60 and starts towing (winding up) the tether 50.

FIG. 3 is a schematic diagram showing a state where the vehicle seat provided with the occupant protection device of the first embodiment is viewed from the side, and is a diagram showing the state at the time of deployment (at the time of collision).
FIG. 4 is a view taken along the line IV-IV in FIG. 3.
When deployed, the tether 50 and the side airbag 60 tear the seat skin and are exposed to the outside.
The tether 50 is wound up onto the bobbin of the deployment device 70 and is towed.
The portion of the intermediate portion 53 of the tether 50 on the end 51 side is stretched in a straight line between the vicinity of the front end of the seat cushion 20 and the vicinity of the upper end of the backrest 30 when viewed from the side. becomes.
Further, a portion of the intermediate portion 53 on the end portion 52 side is folded back near the upper end of the backrest 30 and connected to the deployment device 70 .

As shown in FIG. 3, the side airbag 60 deploys at the side of the occupant's P's body from the upper body UB to the vicinity of the buttocks B when viewed from the side.
A portion of the side airbag 60 is arranged to overlap a portion of the intermediate portion 53 of the tether 50 when viewed from the side, and when the side airbag 60 receives a load in the vehicle width direction, the tether 50 can generate a reaction force.

The tether 50 and the side airbag 60 are provided on the outside in the vehicle width direction (the side adjacent to the side door D) when viewed from the occupant P.
As shown in FIG. 4, when viewed from above, the intermediate portion 53 of the tether 50 is positioned on the outside (side door D side in the example shown in FIG. 4) so as to follow the body shape of the occupant P and the shape of the side airbag 60. It is bent or curved so that it becomes convex.
The side airbag 60 is disposed inside the bent portion of the intermediate portion 53 of the tether 50.
The side airbag 60 is attached, for example, to the surface portion of the tether 50 on the side facing the occupant P side.
The side airbag 60 deploys toward the occupant P with respect to the line of action of the tension acting on the tether 50 (usually contained within the tether 50).

According to the first embodiment described above, the following effects can be obtained.
(1) In the event of a rear collision, the tether 50 is stretched between the front part of the seat cushion 20 and the upper part of the backrest 30, so that the backrest 30, which is pressed against the back of the occupant P, tilts backward. Tilting can be suppressed. Thereby, it is possible to suppress the injury to the occupant P from worsening due to the occupant's P's upper body UB sliding up along the slope of the backrest 30 and the occupant's P's head H and neck climbing over the headrest 40.
Furthermore, in the event of a side collision, the reaction force of the airbag 60 is received by the tether 50, so that the collision energy can be effectively absorbed by the side airbag 60.
In addition, the tether 50 and the side airbag 60 stably press the area from the vicinity of the occupant's shoulders to the vicinity of the thigh toward the side opposite to the side that received the collision, as shown by the arrow in FIG. By causing the body of the occupant P to shift laterally, it is possible to suppress injury to the occupant P due to deformation of the vehicle interior such as the entry of the side door D or deformation of the pillar.
(2) By arranging the side airbag 60 so as to deploy it toward the occupant P with respect to the intermediate portion 53 that coincides with the line of action of the tension of the tether 50, the deployment of the side airbag 60 causes the tether 50 to The intermediate portion 53 is bent or curved in a direction projecting outward when viewed from the occupant P, thereby further increasing the tension of the tether 50 and further enhancing the effect of preventing the backrest 30 from tilting backward.
(3) The tether 50 and the side airbag 60 are arranged along the side of the seat cushion 20 and the side of the backrest 30 in a normal state (state before deployment) where a collision is not detected or predicted. By being stored and stored, the tether 50 and the side airbag 60 do not impair usability such as the ease of getting in and out of the occupant P or the comfort of the vehicle during normal use of the vehicle (non-collision), thereby increasing the convenience of the vehicle. , comfort can be improved.
(4) By providing the tether 50 and the side airbag 60 on the outer side of the seat 1 in the vehicle width direction, the tether 50 The side airbag 60 can push the occupant P inward in the vehicle width direction, thereby suppressing harm to the occupant.

<Second embodiment>
Next, a second embodiment of the occupant protection device to which the present invention is applied will be described.
In each embodiment described below, parts similar to those in the previous embodiment are given the same reference numerals, explanations thereof are omitted, and differences will be mainly explained.
FIG. 5 is a schematic diagram showing a state in which a vehicle seat provided with the occupant protection device of the second embodiment is viewed from above, and is a diagram showing a state at the time of deployment (during a collision). (This corresponds to FIG. 4 of the first embodiment. The same applies to FIG. 6, which will be described later.)

In the passenger protection device of the second embodiment, a tether 50 is also provided on the inside of the vehicle width direction with respect to the passenger P.
According to the second embodiment, in addition to the same effects as those of the first embodiment described above, by pulling the upper end portion of the backrest 30 forward from side to side, the backward tilting behavior of the backrest 30 is further reduced. It can be suppressed reliably.

<Third embodiment>
Next, a third embodiment of an occupant protection device to which the present invention is applied will be described.
FIG. 6 is a schematic diagram showing a state in which a vehicle seat provided with the occupant protection device of the third embodiment is viewed from above, and is a diagram showing a state at the time of deployment (during a collision).
In the third embodiment, in addition to the configuration of the second embodiment, a side airbag 60 is also provided on the inside in the vehicle width direction with respect to the occupant P.
According to the third embodiment, in addition to the same effects as those of the first and second embodiments described above, the tether 50 and the side airbag 60 on the inside in the vehicle width direction are connected to the side surface of the vehicle body on the side far from the occupant P. It can also be used to protect the occupant P in a side collision (far side collision).

<Fourth embodiment>
Next, a fourth embodiment of the occupant protection device to which the present invention is applied will be described.
FIG. 7 is a block diagram schematically showing the system configuration of the occupant protection device according to the fourth embodiment.
The occupant protection device of the fourth embodiment includes a tether gas generator 140 that is independent of the side airbag gas generator 130.
In the fourth embodiment, the deployment gas generated by the side airbag gas generator 130 is used for deploying the side airbag 60, and the tether 50 is pulled by the gas generated by the tether gas generator 140. carried out by
Note that in the fourth embodiment, the tether 50 and the side airbag 60 can have the same configuration as any one of the first to third embodiments.

When the airbag control unit 100 detects or predicts a collision, it changes the timing at which the side airbag gas generator 130 and the tether gas generator 140 operate depending on the collision mode.
If a rear collision is determined, the tether gas generator 140 is first activated to pull the tether 50 to apply tension to the tether 50, and then the side airbag gas generator 130 is activated to pull the tether 50. The airbag 60 is deployed.
On the other hand, if a side collision is determined, first the side airbag gas generator 130 is activated to deploy the side airbag 60, and then the tether gas generator 140 is activated to tow the tether 50. , applies tension to the tether 50.

According to the fourth embodiment, in addition to the same effects as those of the first to third embodiments described above, tension is first generated in the tether 50 in the event of a rear collision, depending on the configuration of the tether 50 and the side airbag 60. This restrains the backward tilting behavior of the backrest 30, and then deploys the side airbag 60, thereby further increasing the tension of the tether 50 and effectively suppressing the occupant from riding up due to the inclination of the backrest 30. be able to.
On the other hand, in the event of a side collision, the side airbag 60 is deployed first and then tension is generated in the tether 50, so that the side airbag 60 can be deployed even in a narrow space surrounded by interior components of the side door D. By reliably deploying the tether 50 and then generating tension in the tether 50, the occupant P can be pushed to the side and moved away from the collision side.

(Modified example)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The configurations of the occupant protection device, the seat, and the vehicle are not limited to the embodiments described above, and can be modified as appropriate.
(2) The method of detecting or predicting a collision in the embodiment and the configuration of the hardware used therein are merely examples, and can be changed as appropriate.
For example, the types of sensors mounted on the own vehicle are not limited to the embodiments, and can be added or omitted as appropriate.
In addition, the collision is not limited to detection and prediction using sensors mounted on the own vehicle, and collisions may be predicted using, for example, road-to-vehicle communication or vehicle-to-vehicle communication.
(3) In the embodiment, the tether and the side airbag are configured as separate parts, but the bag portion may be integrally formed as a part of the tether portion.

1 Seat 10 Base part 20 Seat cushion 30 Backrest 40 Headrest 50 Tether 51 End part 52 End part 53 Intermediate part 60 Side airbag 70 Deployment device 100 Airbag control unit 101 Collision sensor 110 Gas generator for frontal collision airbag 120 Curtain Airbag gas generator 130 Side airbag gas generator 140 Tether gas generator 200 Environment recognition unit 210 Visible light camera device 220 Millimeter wave radar device 230 Laser scanner device P Occupant H Head UB Upper body A Arms L Legs F Thigh B Buttocks D Side door

Claims (5)

An occupant protection device provided on a seat having a seat portion on which the thighs and buttocks of an occupant are placed, and a backrest portion extending upward from the rear of the seat portion and in contact with the back portion of the occupant,
a tether portion provided at a side portion of the seat between a front portion of the seat surface portion and an upper portion of the backrest portion;
a bag part provided in the tether part and deployed by introducing a deployment gas;
a collision detection unit that detects or predicts a vehicle collision;
an occupant protection control section that generates tension in the tether section and deploys the bag section in response to detection or prediction of the collision by the collision detection section;
The occupant protection device is characterized in that the bag portion is arranged so as to overlap the tether portion when viewed from the side of the occupant. The occupant protection device according to claim 1, wherein the bag section is deployed toward the occupant with respect to a line of action of tension in the tether section. The tether portion and the bag portion are arranged or stored along the sides of the seat portion and the backrest portion in a normal state where the collision is not detected or predicted. The occupant protection device according to claim 1 or 2, characterized in that: The occupant protection device according to claim 1, wherein the tether portion and the bag portion are provided at least on an outer side portion of the seat in the vehicle width direction. comprising a collision mode determination unit that determines the collision mode;
The occupant protection control section generates tension in the tether section and then deploys the bag section in response to detection or prediction of a rear collision, and deploys the bag section in response to detection or prediction of a side collision. The occupant protection device according to claim 1, wherein tension is then generated in the tether portion.

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