JP2021017130A - Occupant protection device - Google Patents

Abstract

To provide an occupant protection device capable of selectively using expansion and deployment in front of a seat back and expansion and deployment in the rear of the seat back with one air bag device at a collision of a vehicle.SOLUTION: An occupant protection device comprises: a seat 5 having a seat cushion 5a and a seat back 5b; and a seat back device 21 arranged in the seat back of the seat and expanding and deploying an air bag 23. The air bag of the seat back device can be switched between an occupant holding form X in which the air bag expands and deploys in the front of the seat back to hold an occupant α seated on the seat and a collision restraint form Y in which the air bag expands and deploys in the rear of the seat back to restrain a collision with the seat back. The air bag can be selectively used between the occupant holding form and the collision restraint form at a collision of a vehicle.SELECTED DRAWING: Figure 3

Description

The present invention relates to an occupant protection device that protects an occupant seated on a seat.

In automobiles (vehicles), airbag devices are provided on the steering wheel and instrument panel to protect the occupants seated in the seat in the event of a collision.
Recently, a technique has been proposed in which an airbag device is provided on the seat separately from these to hold the upper body of the occupant seated on the seat. For example, as disclosed in Patent Document 1, there is a technique of expanding and deploying an airbag from the upper part of the seat back to the front side of the occupant's upper body to hold the occupant on the seat back.

Japanese Unexamined Patent Publication No. 2019-26227

However, the airbag device of Patent Document 1 is only supposed to protect the occupant seated on the front seat with an inflatable airbag, and the situation behind the seat back, for example, the seat back and the front of the front seat. It is not assumed that the occupant seated on the rear seat behind the seat will collide.
In order to suppress the collision of the front seat with the seat bag, in addition to the airbag device for holding the occupant seated on the front seat, a separate airbag device for suppressing the collision with the seat back is required.

This requires two sets of airbag devices, which imposes a cost burden. Moreover, since the installation space for the seat bag device is limited, it is difficult to install two sets of airbag devices.
Therefore, an object of the present invention is to provide an occupant protection device capable of properly using the expansion and deployment in front of the seat back and the expansion and deployment in the rear of the seat bag with one airbag device in the event of a vehicle collision. ..

Aspects of the present invention include a seat cushion and a seat back, a seat on which an occupant can be seated, and a seat back device provided on the seat back of the seat to inflate and deploy the airbag. The airbag of the device can be switched between a occupant holding mode that expands and expands forward of the seat back to hold the occupant seated on the seat and a collision suppression mode that expands and expands rearward of the seat back to suppress a collision with the seat back. In the event of a vehicle collision, the airbag can be used properly in the occupant holding form and the collision suppressing form.

According to the present invention, when it is required to hold a seated occupant in the event of a collision, the airbag expands and expands in front of the seat back from the airbag device provided on the seat back, that is, the form when the airbag expands and expands. The occupant is held in the occupant holding form. When it is required to suppress the collision with the seat back, the collision is suppressed in the form when the airbag expands and expands to the rear of the seat back from the same airbag device, that is, the collision suppression form.

Therefore, in the event of a vehicle collision, one airbag device can be used for expansion and deployment in front of the seat back and expansion and deployment in the rear of the seat bag, reducing costs associated with expanding the use of airbag devices. It is possible to reduce the occupied area.

The side view which shows the occupant protection device which is the aspect which concerns on 1st Embodiment of this invention. The perspective view explaining each part of the shoulder airbag device which comprises the passenger protection device. Explanatory drawing which shows the occupant protection form in which an airbag expands and expands forward of a seat back, and the collision suppression form which expands and expands backward in a seat back. A side view showing an expanded and inflated state of an airbag when the seat is in a sleeping position and receives an impact force. A side view showing the expanded and inflated state of the airbag when the seat is in the upright position and receives an impact force. A side view illustrating a first posture in which a seat according to a second embodiment of the present invention is in a sleeping posture and expands and expands when an impact force is received from the rear of the vehicle body. Similarly, a side view illustrating a second posture that expands and expands when an impact force is received from the front of the vehicle body. The perspective view explaining the bending adjustment part which adjusts the bending degree of the airbag which is the aspect which concerns on 3rd Embodiment of this invention. A side view illustrating that the degree of bending of the airbag is adjusted according to the angle of the seat back. FIG. 5 is a side view illustrating that the degree of bending of the airbag is adjusted according to the shoulder position (upper body position) of the occupant according to the fourth embodiment of the present invention. FIG. 5 is a side view illustrating the expansion and expansion of the airbag when the orientation of the seat according to the fifth embodiment of the present invention changes in the front-rear direction.

Hereinafter, the present invention will be described based on the first embodiment shown in FIGS. 1 to 5.
FIG. 1 shows a schematic configuration of an automobile (vehicle) on which the occupant protection device A is mounted. By the way, although not shown, an automobile (vehicle) is provided with equipment and equipment necessary for automatic driving, and is a vehicle capable of automatic driving.
First, to explain each part of this automobile (vehicle), reference numeral 1 in FIG. 1 is a vehicle body, 3 is a vehicle interior formed in the vehicle body 1, and 5 is a driver's seat or a passenger seat installed in the vehicle interior 3. A front seat (corresponding to the seat of the present application), 7 is a rear seat installed behind the front seat 5, and 9 is an instrument panel provided in the vehicle interior 3.

Reference numeral 11 denotes wheels arranged at the front and rear of the vehicle body, 13 indicates a steering wheel for steering the vehicle to the left and right (in the vehicle width direction), and 15 indicates a driver's seat airbag device equipped on the steering wheel 13.
The front seat 5 has a seat cushion 5a and a seat back 5b provided at the rear of the seat cushion 5a. A headrest 5c is attached to the upper end of the seat back 5b. By the way, the seat cushion 5a supports the buttocks of the occupant α, and the seat back 5b supports the back of the occupant α.

The seat back 5b can be reclined in the front-rear direction of the vehicle by the reclining mechanism portion 6 provided on the side portion of the seat back 5b. For example, the angle of the seat back 5b can be adjusted from an upright posture to a sleeping posture in which the seat back is greatly tilted backward. Incidentally, the reclining mechanism unit 6 is provided with a reclining sensor 17 (corresponding to the seat back angle sensor of the present application) that detects the angle of the seat back 5b (shown in FIG. 2).

A shoulder airbag device 21 (corresponding to the airbag device of the present application) as shown in FIG. 2 is embedded in the upper end side of the seat back 5b of the front seat 5 to form the occupant protection device A.
As shown in FIGS. 3A and 3B, the shoulder airbag device 21 includes an airbag 23 capable of extending from both sides of the headrest 5c to the front of the seat back 5b or to the rear of the seat back 5b. It has a switching unit 35 that can switch the front and rear overhanging forms of the airbag 23.

For example, the airbag 23 communicates with the relay airbag portion 25 extending in the width direction at the upper end portion of the seat back 5b as shown in FIGS. 2 and 3A and both ends of the relay airbag portion 25. It has a pair of arm-shaped airbag portions 27. The pair of arm-shaped airbag portions 27 are formed by folding an arm-shaped bag body that can be deployed in an arm shape from the rear side of the seat back 5b upward. A switching unit 35 is arranged below the relay airbag unit 25.

As shown in FIG. 3B, the arm-shaped airbag portion 27 is assembled with a bending generating portion 29 that bends the folded arm-shaped bag body to the front or the rear of the seat back 5b. .. For example, the bending generation unit 29 is a pair of tethers 29a and 29b (string members) on each side portion which becomes an inner peripheral portion and an outer peripheral portion when the seat back 5b is bent in the front-rear direction in the bag body developed in an arm shape. The structure along which is used.

Specifically, the pair of tethers 29a and 29b are all along the longitudinal direction (deployment direction) of the arm-shaped bag body. The tip of each tether 29a, 29b is fixed to the tip of the arm-shaped airbag portion 27, which is the tip of the arm-shaped bag body, the base end portion reaches the switching portion 35, and the intermediate portion of the tethers 29a, 29b. The (tip portion to base end portion) is slidably supported by loop tools 29c provided on each portion of the arm-shaped bag body.

That is, when the length of one of the tethers 29a and 29b is changed in the bending generation unit 29, the arm-shaped airbag portion 27 passes through the side of the headrest 5c as shown in FIGS. 3A and 3B. It is unfolded while bending toward the front of the seat back 5b and toward the seat back 5b, and conversely, it is unfolded while bending toward the rear of the seat back 5b and toward the seat back 5b.

Specifically, if the length of the tether 29a on the inner peripheral side and the length of the tether 29b on the outer peripheral side are in a relationship of L1> L2 as shown in FIG. 3B, the pair of arm-shaped airbag portions 27 , The seat bag is unfolded while bending forward. On the contrary, when the relationship of L3> L4 is set as shown by the alternate long and short dash line in FIG. 3B, the pair of arm-shaped airbag portions 27 are deployed while bending rearward of the seat bag.

That is, depending on the lengths of the tethers 29a and 29b, the arm-shaped airbag portion 27 may be deployed in the occupant holding mode X suitable for holding the occupant α seated on the front seat 5 as shown in FIG. As in 5, the seat back 5b and the occupant β seated on the rear seat 7 may be deployed in a collision suppression form Y suitable for suppressing collision. As a result, the occupant holding form X and the collision suppressing form Y can be properly used in one airbag 23.

An inflator 31 that generates gas is housed in the relay airbag section 25, and the folded arm-shaped airbag section 27 expands and expands into the occupant holding form X or the collision suppression form Y by the gas generated by the inflator 31. Will be done.
On the other hand, the switching portion 35 is formed by, for example, a pair of tubular portions 41 arranged vertically as shown in FIG. 2B and a mass of synthetic resin members fixed to the upper stage side in the tubular portion 41, for example, heat. It has a mass 43 of a resin member that is easily dissolved in the above, and a heat generating source 45 composed of explosives or the like provided on the lower stage side in the tubular portion 41.

Here, the length of each of the tethers 29a and 29b is defined by the dimensions for securing the preset occupant holding form X and collision suppressing form Y. The base end portions of the tethers 29a and 29b are movably inserted through the upper end wall of each tubular portion 41 and attached to the mass 43.
Two sets of such switching portions 35 are prepared for each arm-shaped airbag portion 27, and when the restraint of the tether 29a is released from the dissolution of the mass 43 due to the ignition of the explosive (free state), each arm-shaped airbag portion 27 is expanded and deployed in the occupant holding form X. Further, when the restraint of the tether 29b is released (free state), each arm-shaped airbag portion 27 is expanded and deployed in the collision suppression form Y. Of course, other structures may be used.

On the other hand, reference numeral 51 in FIG. 2 is a control unit (for example, configured to have a microcomputer) mounted on an automobile (vehicle). The control unit 51 controls the shoulder airbag device 21. A reclining sensor 17, an inflator 31, a collision sensor 53 that detects a rear collision of an automobile (vehicle), and the like are connected to the control unit 51.
When the control unit 51 receives a collision signal (regardless of front collision or rear collision), the angle of the seat back 5b of the front seat 5 is equal to or more than a predetermined angle value, and the sleeping posture is tilted backward, for example, as shown in FIG. Ignition control that frees the tether 29a (rear seat 7 side) of the switching unit 35 when the seat back 5b is tilted backward, and a rising posture in which the angle of the seat back 5b is less than a predetermined angle value, for example, FIG. Ignition control is set to free the tether 29b (front seat 5 side) of the switching unit 35 when the seat back 5b is in the raised posture as described above.

As a result, at the time of a collision, when the shoulder airbag device 21 is in a sleeping posture in which the occupant α is required to be held, it is expanded and deployed in the occupant holding form X, and the seat back 5b and the occupant β seated on the rear seat 7 When a collision is required, the vehicle is switched so as to expand and expand in the collision suppression mode Y.
Next, the operation of the occupant protection device A will be described with reference to FIGS. 4 and 5.

Now, it is assumed that the automobile is driven automatically, for example, without the operation of the occupant α.
At this time, the occupant α (for example, the driver) seated on the front seat 5 tilts the seat back 5b backward as shown in FIG. 4, for example, in a posture in which the seat cushion 5a and the seat back 5b face laterally. It is assumed that the vehicle lies on the seat cushion 5a and the seat back 5b in a sleeping posture.

The sleeping posture of the front seat 5 means that the seat back 5b has fallen backward by a predetermined angle value or more.
The head of the occupant α is located at the headrest 5c, and the shoulders of the occupant α are located near both sides of the headrest 5c.
At this time, it is assumed that the automobile is hit from the rear (rear-end collision) and the impact force F1 is applied from the rear of the vehicle.

Here, since the seat back 5b is in a posture of tilting backward, the occupant α on the seat 5 is in a situation where it is easy to move backward due to the impact force F1 applied from the rear part of the vehicle.
At this time, the collision sensor 53 detects a collision. Then, the control unit 51 detects that the front seat 5 is in a lying position (rear collision), ignites the explosive of the cylinder portion 41 arranged on the rear seat 7 side of the switching unit 35, and causes the arm-shaped air. The tether 29a (rear seat 7 side) of the bag portion 27 is freed. At the same time, the inflator 31 is operated to inflate the arm-shaped airbag portion 27 with the generated gas.

Then, the folded arm-shaped airbag portion 27 is curved in an arc shape as shown in FIGS. 3 (a), 3 (b) and 4, respectively, from the upper part of the seat back 5b. It is expanded and deployed in the occupant holding mode X in front of the seat back 5b via both sides of the headrest 5c, covers the shoulder portion of the occupant α, and holds the occupant α.
As a result, the behavior of the occupant α toward the rear can be suppressed.

Further, it is assumed that in this sleeping posture, a collision in which an impact force F2 is applied from the front part of the vehicle occurs (front collision).
The arm-shaped airbag portion 27 is also expanded and expanded from the upper part of the seat back 5b through both sides of the headrest 5c to the front of the seat back 5b while drawing the occupant holding form X, covering the shoulder portion of the occupant α and occupant. Holds α.

By pressing the occupant α by the airbag 23 at this time, the behavior of the occupant α brought by the front collision toward the front or upward of the vehicle is suppressed.
On the other hand, as shown in FIG. 5, when the occupant α is seated in the raised posture Y (the angle at which the seat bag 5b is less than the predetermined angle value) in which the seat back 5b is raised, the impact force F2 is applied from the front part of the automobile. Suppose that is added.

At this time, as shown by the alternate long and short dash line in FIG. 5, the driver airbag device 15 mounted on the steering wheel 13 operates, and the airbag 15a of the driver airbag device 15 expands and expands. Therefore, the occupant α seated on the front seat 5 is held, and the behavior of the occupant α toward the front of the vehicle is suppressed.
At this time, the control unit 51 detects that the front seat 5 is in a raised posture (front collision), and this time ignites the explosive of the cylinder portion 41 arranged on the front seat 5 side of the switching unit 35. .. As a result, the tether 29b (front seat 5 side) of the arm-shaped airbag portion 27 becomes free. Of course, the inflator 31 is operated together with this switching operation to inflate the arm-shaped airbag portion 27 with the generated gas.

As a result, the folded arm-shaped airbag portion 27 is curved in an arc shape as shown in FIGS. 3 (a), 3 (b) and 5, respectively, from the upper part of the seat back 5b. , The seat back 5b is expanded and expanded while drawing the collision suppression form Y behind. That is, a system is entered to prepare for a collision with the occupant β seated on the rear seat 7. As a result, the occupant β of the rear seat 7 is prevented from being displaced to the front side of the vehicle by the impact of the front collision and colliding with the seat back 5b.

By the way, in the raised posture, the arm-shaped airbag portion 27 is expanded and deployed in the collision suppression mode Y even when the impact force F1 of the rear collision is applied as shown by the alternate long and short dash line in FIG. At this time, it is suppressed that the occupant β of the rear seat 7 is displaced to the front of the vehicle due to the reaction at the time of the rear collision and collides with the seat back 5b.
Therefore, by adopting the shoulder airbag device 21 that can be used properly for the occupant holding form X and the collision suppression form Y, one shoulder airbag device 21 can expand and deploy the seat back 5b forward and the seat bag. It can be used properly with the backward expansion of 5b. As a result, it is possible to expand the use of the shoulder airbag device 21 in the event of a vehicle collision.

Therefore, as the use of the shoulder airbag device 21 is expanded, the cost can be reduced and the occupied area can be reduced (claim 1).
Moreover, the shoulder airbag device 21 switches to the occupant holding mode X when the seat back 5b is in a sleeping posture in which the angle of the seat back 5b is tilted backward by a predetermined angle or more at the time of a collision regardless of whether the front collision or the rear collision occurs (FIG. 4). Since the collision suppression mode Y is switched to when the posture is less than the angle (FIG. 5), the airbag 23 can be sufficiently used properly according to the required situation with simple control (claim 2).

6 and 7 show a second embodiment of the present invention.
In the present embodiment, the occupant holding posture X can be further divided into two forms according to the situation of the occupant α at the time of a collision.
That is, it is preferable that the occupant α seated in the sleeping posture is held with an emphasis on suppressing the movement to the rear of the vehicle at the time of a rear collision, and it is important to suppress the movement to the front of the vehicle or upward at the time of a front collision. Preservation is preferable.

However, there is a limit to holding the occupant α in one occupant holding posture X at the time of a collision regardless of the front collision or the rear collision.
Therefore, in the present embodiment, in order to improve the holding performance of the occupant α, the occupant holding posture X is covered with the upper body of the occupant α seated on the seat bag 5b in the sleeping posture as shown in FIG. The first posture X1 that expands and expands while bending from the upper part of the seat back 5b to the front of the seat back so as to cover the portion, and the upper body of the occupant α is pressed against the seat back 5b as shown in FIG. It is used properly for the second posture X2, which expands and expands while bending forward of the seat back from the one posture X1.

For example, the second posture X2 is set to a posture in which the upper body of the occupant α is effectively pressed onto the seat bag 5b by extending from the upper part of the seat back 5b to the armpit of the occupant α.
Specifically, for example, as shown by the reference numeral S in FIG. 2B, a deflection portion 57 is formed as a length changing portion in a part of the tether 29a, for example, a part of the tether 29a, and the deflection portion 57 is in a normal state. Then, when a signal is input, the length changing portion 55 provided with the holder 59 for eliminating the bending of the bending portion 57 is used.

As a result, the arm-shaped airbag portion 27 obtains the first posture X1 when the bending portion 57 is maintained by the holding tool 59, and when the bending portion 75 is eliminated by the holding tool 59 (extended state). , The second posture X2 is obtained. Of course, the holder 59 is connected to the control unit 51.
Then, when the control unit 51 detects a rear collision by the collision sensor 53 in the sleeping posture, the arm-shaped airbag unit 27 is expanded and deployed in the first posture X1, and the front collision is detected by the collision sensor 53. The arm-shaped airbag portion 27 is expanded and deployed in the second posture X2.

In this way, the occupant α in the sleeping posture can hold the occupant α suitable for each situation, so that the movement of the occupant α to the rear of the vehicle can be effectively suppressed in the event of a rear collision. At the time of a front collision, the movement of the occupant α in front of or upward of the vehicle can be effectively suppressed (claim 3). Of course, the first posture X1 and the second posture X2 may be obtained by other structures.
8 and 9 show a third embodiment of the present invention.

In this embodiment, the degree of bending of the first posture X1 and the second posture X2 can be adjusted according to the angle of the seat back 5b.
For this purpose, for example, a bending adjustment unit 71 capable of adjusting the bending condition of the first posture X1 and the second posture X2 as shown in FIG. 8 is used. For example, in the bending adjustment portion 71, a U-shaped tether 72 extending from the arm-shaped airbag portion 27 is bridged over the pulley 73, a flexible portion 75 is formed in a part of the tether 72, and the pulley 73 is used for driving the pulley. A structure for connecting the actuator 77 is used.

Incidentally, although not shown, a length changing portion similar to the structure of the length changing portion 55 in FIG. 2 is incorporated in a part of the tether 72.
The pulley 73 is rotationally controlled in response to the angle signal of the seat back 5b detected from the reclining sensor 17, and is the first according to the seat angle θ of the front seat 5 as shown in FIGS. 9A and 9B. The bending condition of the posture X1 and the bending condition (not shown) of the second posture X2 are adjusted.

By adjusting the bending condition of the first posture X1 and the second posture X2 according to the angle of the seat back 5b in this way, the occupant α can be held without giving an unnecessary burden (claim 4). ..
As shown by the alternate long and short dash line in FIG. 8, flexible portions 75 may be provided on both sides of the tether 72 spanning the pulley 73 to adjust the degree of bending of the collision suppression mode Y. ..

FIG. 10 shows a fourth embodiment of the present invention.
In this embodiment, the upper body position of the occupant α is used by using the bending adjustment unit 71 described above so that the first posture X1 and the second posture X2 match the occupant α having any sitting height. The bending conditions of the first posture X1 and the second posture X2 are adjusted according to the above, and specifically, the first posture X1 and the second posture X2 are made to reach the upper body position of the seated occupant α. ..

Specifically, for example, as shown by the alternate long and short dash line in FIG. 1, the upper body position of the occupant α in the seat back 5b when seated on the front seat 5, for example, the shoulder position of the occupant α is detected in the vehicle interior 3. A shoulder position sensor 76 (corresponding to the occupant sensor of the present application) is provided. Here, a camera is used for the shoulder position sensor 76.
Then, the actuator 77 of the bending adjustment unit 71 is controlled by a control unit (not shown) so that the expanded and deployed airbag 23 reaches the detected shoulder position (upper body position) of the occupant α in the first posture X1. , Adjust the bending condition of the second posture X2.

In this way, no matter what seat height the occupant α is seated on the front seat 5, the occupant α can be more reliably held by the airbag 23 (claim 5).
Of course, as in the fifth embodiment of the present invention shown in FIG. 11, the front seat 5 whose seat orientation can be changed forward or backward is provided with the expansion and deployment of the airbag 23 in the occupant holding mode X (first posture X1). , Second posture X2), a shoulder airbag device 21 that can be switched to the collision suppression mode Y may be provided.

In this case, when the front seat 5 faces the rear of the seat vehicle, it is in the first posture X1 at the time of a front collision and in the second posture X2 at the time of a rear collision.
However, in the above-described second to fifth embodiments, the same parts are designated by the same reference numerals and the description thereof is omitted.
The present invention is not limited to the above-described embodiment, and various variations may be made within a range that does not deviate from the gist of the present invention. For example, in the above-described embodiment, a structure is adopted in which the holding airbag portion is branched from both ends of the relay airbag, but the present invention is not limited to this, and the airbag is divided into left and right, and an inflator is provided for each division to expand independently. You may deploy it.

1 Body 5 Front seat (seat)
5a Seat cushion 5b Seat back 17 Reclining sensor (seat back angle sensor)
21 Shoulder airbag device (seat bag device)
23 Airbag 35 Switching unit 53 Collision sensor 71 Curve adjustment unit 76 Shoulder position sensor (occupant sensor)
A Crew protection device α Crew X Crew holding form X1 First posture X2 Second posture Y Collision suppression mode

Claims (5)

A seat that has a seat cushion and a seat back so that the occupant can sit on it,
A seat back device provided on the seat back of the seat and inflating and deploying the airbag is provided.
The airbag of the seat back device has a occupant holding form that expands and expands forward of the seat back to hold an occupant seated on the seat, and collision suppression that expands and expands rearward of the seat back to suppress a collision with the seat back. It is configured to be switchable to the form,
A occupant protection device characterized in that, in the event of a vehicle collision, the airbag is used properly in the occupant holding form and the collision suppressing form. A seat back angle sensor that detects the seat back angle of the seat and
It has a switching unit for properly using the occupant holding form and the collision suppressing form of the seat bag at the time of a vehicle collision.
When the switching unit is in a sleeping posture in which the seat back angle is equal to or greater than a predetermined angle value at the time of a collision, the airbag is switched to the occupant holding mode, and the seat back angle becomes less than the predetermined angle value. The occupant protection device according to claim 1, wherein the airbag is switched to a collision suppression mode when the airbag is in a raised position. It has a collision sensor that detects when a vehicle collides,
The occupant-holding posture form of the airbag includes a first posture in which the airbag expands and expands while bending from the upper part of the seat back to the front of the seat back so as to cover the upper body of the occupant located on the seat back, and the seat bag. It has a second posture that expands and expands while bending from the upper part of the seat back to the front of the seat back so as to press the upper body of the occupant located in the seat back against the seat back.
When the collision sensor detects a rear collision when the seat back is in the sleeping position, the switching unit expands and deploys the airbag in the first posture, and the collision sensor detects the front collision. The occupant protection device according to claim 2, wherein the airbag is expanded and deployed in the second posture. It has a bending adjustment unit that can adjust the bending condition in the first and second postures of the seat back.
The occupant protection device according to claim 3, wherein the bending adjustment unit adjusts the bending of the first posture and the second posture according to the angle of the seat back. An occupant sensor that detects the position of the occupant's upper body on the seat back, and
It has a bending adjustment unit that can adjust the bending condition in the first posture and the second posture of the seat back.
The occupant protection device according to claim 3, wherein the bending adjustment unit adjusts the bending condition of the first posture so that the expanding and deploying airbag reaches the detected position of the occupant's upper body. ..

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