Airbag device

Abstract

[Problem] To provide a revolutionary airbag device that can protect the head of an occupant on one side and on the front side as well as on the other side. [Solution] The present invention provides an airbag device housed in a vehicle seat and comprising: an inflator that produces an inflation gas; and an airbag that provides protection around the head of an occupant by being deployed from an area near the upper end of the vehicle seat. Additionally, the airbag comprises: a first chamber that protects one side of the occupant; a second chamber which is connected to the first chamber and which protects the front of the head of the occupant; a third chamber which is connected to the second chamber and which is deployed to span from the front of the head of occupant to the other side; and a fourth chamber which is connected to the third chamber and which is deployed on the other side of the occupant.

Description

[Technical field]

[0001] The present invention relates to an airbag device mounted in a vehicle seat, and more particularly to an airbag device capable of adequately protecting the head of an occupant. [Background technology]

[0002] It is well known that one or more airbag devices are provided in a vehicle to protect the occupant in the event of a vehicle accident. There are various types of airbag devices, such as a driver airbag device that deploys near the center of the steering wheel to protect the driver, a curtain airbag device that deploys downward inside the window to protect the occupant in the event of a lateral impact or rollover or overturning accident, and a side airbag device that deploys on the side of the occupant (the side of the seat) to protect the occupant in the event of a lateral impact of the vehicle. The present invention relates to a novel airbag device provided in a vehicle seat.

[0003] A side airbag device restrains the lateral movement of an occupant by using an airbag that deploys forward from the seat. For example, an invention disclosed in Patent Document 1 has been proposed that is configured to protect not only the torso of an occupant, but also the head.

[0004] However, in the airbag device described in Patent Document 1, the deployed airbag can restrain one side (either the left or right side) of the occupant's head, but it is virtually impossible to protect the entire area, including the front of the head. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-137307 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide an innovative airbag device that can protect an occupant's head from one side to the front and even the other side. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides an airbag device accommodated in a vehicle seat, comprising: an inflator that generates inflation gas; and an airbag that protects the area around the head of an occupant by deploying from near the upper end of the vehicle seat. The airbag comprises a first chamber that protects one side of the occupant, a second chamber that is connected to the first chamber and protects the front of the occupant's head, a third chamber that is connected to the second chamber and deploys from the front of the occupant's head to the other side, and a fourth chamber that is connected to the third chamber and deploys on the other side of the occupant.

[0008] According to the present invention, the airbag surrounds the occupant's head from one side, the front, and the other side, making it possible to reliably restrain the occupant's head regardless of the seat position, reclining angle, etc. Also, in the present invention, there is no need to use the steering wheel, instrument panel, etc. as a reaction surface when the airbag deploys, and the deployment behavior and deployed shape of the airbag can be stabilized regardless of the seat position, etc.

[0009] The first chamber and the second chamber can be integrally formed by bonding two pieces of base fabric together.

[0010] A bent portion can be formed in which the vicinity of the boundary between the first chamber and the second chamber is bent in a direction approaching the head of the occupant, thereby ensuring that the second chamber is deployed in front of the head of the occupant.

[0011] A tether is connected to at least the second chamber, and the bend can be formed by tension of the tether when the airbag is deployed.

[0012] The first chamber and the second chamber may be molded as separate chambers.

[0013] Each of the first chamber and the second chamber can be formed by bonding two pieces of base fabric together. The base fabric forming the first chamber can be connected to a front end of an inner panel facing the occupant, and the base fabric forming the second chamber can be connected to an end of an inner panel facing the occupant, the end being located opposite to the third chamber.

[0014] By connecting the inner panels of the base fabric together, the outward spread of the connected parts (away from the occupant's head) when the airbag deploys is limited, making it easier to create a curved shape that surrounds the occupant's head.

[0015] The third chamber can be formed by bonding at least two pieces of base fabric together, and an end of an inner panel of the base fabric forming the second chamber that faces the occupant can be connected to an end of an inner panel of the base fabric forming the third chamber that faces the occupant.

[0016] A first vent hole may be formed at a connection between the second chamber and the third chamber.

[0017] The fourth chamber can be formed by folding one piece of fabric or by gluing two pieces of fabric together.

[0018] A second vent hole may be formed at a connecting portion between the third chamber and the fourth chamber.

[0019] The first chamber may include an upper direction portion that first deploys upward, and a forward direction portion that is connected to the upper direction portion and deploys forward.

[0020] A side protection chamber may further be provided, connected to the vicinity of the lower end of the upper portion of the first chamber, for protecting the sides of the occupant's body.

[0021] The inflator may be disposed within the side guard chamber, and inflation gas may be configured to flow from the side guard chamber to the first chamber, the second chamber, the third chamber, and the fourth chamber.

[0022] The second chamber may be configured to extend downward from the first chamber, and an end of the second chamber connected to the third chamber may be configured to bend upward when the airbag is deployed.

[0023] A side airbag device for protecting the sides of the occupant can be provided on the side of the vehicle seat opposite to the side where the airbag device is accommodated, in addition to the airbag device. For example, the side airbag device can be provided on the so-called near side, and the airbag device for mainly protecting the head can be provided on the far side, thereby making it possible to thoroughly protect the occupant. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view mainly showing the external shape of a vehicle seat to which an airbag device according to the present invention can be applied, and the airbag device is not shown. [Diagram 2] FIG. 2 is a perspective view showing an internal structure (seat frame) that functions as a framework of the vehicle seat shown in FIG. 1, and an airbag device is omitted from the illustration. [Diagram 3] FIG. 3 is a schematic side view of a vehicle seat equipped with an airbag device 20 according to an embodiment of the present invention, showing the airbag device 20 housed as seen through from the outside in the vehicle width direction. [Figure 4] FIG. 4 is a top view that typically shows a state in which the airbag is deployed in the airbag device according to the embodiment of the present invention. [Diagram 5]FIG. 5 is a top perspective view (bird's-eye view) showing a state in which the airbag is deployed in the airbag device according to the embodiment of the present invention. [Figure 6] FIG. 6 is a front perspective view showing a state in which the airbag is deployed in the airbag device according to the embodiment of the present invention. [Figure 7] FIG. 7 is a plan view showing the shape of a panel constituting an airbag used in an airbag device according to an embodiment of the present invention, which defines the first and second chambers. [Figure 8] FIG. 8 is a plan view showing the shape of a panel constituting an airbag used in an airbag device according to an embodiment of the present invention, which panel forms a side chamber. [Figure 9] FIG. 9 is a plan view showing the shape of a panel constituting an airbag used in an airbag device according to an embodiment of the present invention, which panel forms a third chamber. [Figure 10] FIG. 10 is a plan view showing the shape of a panel constituting an airbag used in an airbag device according to an embodiment of the present invention, which panel forms a fourth chamber. [Figure 11] FIG. 11 is a plan view for explaining the connection of the panels shown in FIGS. [Figure 12] FIG. 12 is a plan view showing a state in which the panels shown in FIGS. 7 to 10 are connected. [Figure 13] FIG. 13 is a top view showing a state in which an airbag is deployed in an airbag device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The airbag device according to the present invention will be described below with reference to the attached drawings. In the following description, when an occupant sits on a seat in a normal position, the direction in which the occupant faces is referred to as "forward", the opposite direction is referred to as "rear", and the coordinate axes are referred to as "front-rear direction". When an occupant sits on a seat in a normal position, the right side of the occupant is referred to as "right direction", the left side of the occupant is referred to as "left direction", and the coordinate axes are referred to as "left-right direction". When an occupant sits on a seat in a normal position, the head direction of the occupant is referred to as "upper", the waist direction of the occupant is referred to as "lower", and the coordinate axes are referred to as "up-down direction". In addition, in the deployed airbag, the side facing the occupant (head) is referred to as the inside, and the opposite side is referred to as the outside.

[0026] Fig. 1 is a perspective view mainly showing the external shape of a vehicle seat used in the passenger protection device according to the present invention, and an airbag device (20) is not shown. Fig. 2 is a perspective view showing an internal structure (seat frame) that functions as a framework of the vehicle seat shown in Fig. 1, and again, an airbag device (20) is not shown. Fig. 3 is a schematic side view of the passenger protection device according to the present invention, showing a state in which the airbag device 20 is housed on the side (far side) of the vehicle seat far from the door, as viewed from the outside in the vehicle width direction.

[0027] A vehicle seat to which the present invention can be applied is, when viewed as a whole, composed of a seat cushion 2 on which an occupant sits, a seat back 1 forming a backrest, and a headrest 3 connected to the upper end of the seat back 1, as shown in Figures 1 and 2.

[0028] As shown in Fig. 1, an airbag device 20 according to this embodiment is mainly accommodated in a side support portion (far side) of a vehicle seat. Reference numeral 21 denotes a housing that accommodates a part of the airbag (head protection portion 31) constituting the airbag device 20, and is located at the top of the seat back 1 and fixed to the side of the headrest 3. The housing 21 is designed to split open in the front or diagonally forward direction when the airbag device 20 is activated and the airbag 30 is deployed.

[0029] The upper part of the airbag 30 (head protection part 31) can be accommodated inside the upper end of the seat back 1, in addition to being accommodated in the housing 21 configured as a separate body. In particular, in the case of a vehicle seat in which the headrest 3 is integrated with the seat back 1, the accommodation space for the airbag 30 can be flexibly set.

[0030] As shown in Fig. 2, a seat back frame 1f is provided inside the seat back 1 to form the framework of the seat, and a pad made of urethane foam or the like is provided on and around the seat back frame 1f, and the surface of the pad is covered with a covering such as leather, fabric, etc. A seat frame 2f is disposed on the bottom side of the seat cushion 2, and a pad made of urethane foam or the like is provided on the top surface and around the seat back frame 2f, and the surface of the pad is covered with a covering such as leather, fabric, etc. The seat frame 2f and the seat back frame 1f are connected via a reclining mechanism 4.

[0031] 2, the seat back frame 1f is configured in a frame shape by seat frames 10 arranged spaced apart on the left and right and extending in the vertical direction, an upper frame connecting the upper ends of the seat frames 10, and a lower frame connecting the lower ends of the seat frames 10. The headrest 3 is configured by providing a cushion member on the outside of the headrest frame.

[0032] FIG. 3 is a schematic side view of an occupant protection device according to the present invention, showing an airbag device 20 housed on the side (far side) of a vehicle seat far from the door, as viewed from the outside in the vehicle width direction.

[0033] 3, the airbag device 20 is accommodated near the upper right end of the seat back 1 of the vehicle seat. In this embodiment, the airbag device 20 is disposed on the so-called far side, but it is also possible to dispose it on the near side.

[0034] Fig. 4 is a top view showing a schematic diagram of the airbag (30) deployed in the airbag device 20 according to the embodiment of the present invention. Fig. 5 is a top perspective view (bird's-eye view) showing the airbag (30) deployed. Fig. 6 is a front perspective view showing the airbag (30) deployed. In Figs. 4 and 5, the dashed lines indicate sewing lines.

[0035] As shown mainly in Fig. 4, the airbag device 20 according to this embodiment includes: an inflator 160 (see Figs. 6 and 8) that generates inflation gas; and an airbag 30 that protects the area around the head of an occupant P by deploying from near the upper right end of a vehicle seat. The airbag 30 includes a first chamber 32 that protects one side of the occupant P; a second chamber 34 that is connected to the first chamber 32 and protects the front of the head of the occupant P; a third chamber 36 that is connected to the second chamber 34 and deploys from the front of the head of the occupant P to the other side; and a fourth chamber 38 that is connected to the third chamber 36 and deploys on the other side of the occupant P.

[0036] The first chamber 32 and the second chamber 34 are integrally molded as one chamber. A bent portion 33 that bends in a direction approaching the head of the occupant P is formed near the boundary between the first chamber 32 and the second chamber 34, which enables the second chamber 34 to be deployed reliably in front of the occupant's head.

[0037] A tether 200 is connected so as to span between the first chamber 32 and the second chamber 34, and when the airbag 30 is deployed, the tension of the tether 200 bends the second chamber 34. One end of the tether 200 is connected to the inner surface of the second chamber 34. The other end of the tether 200 can be connected to a surface of the first chamber 32 at least rearward of the inner surface of the second chamber 34, or to another member such as a seat frame.

[0038] As shown in Figs. 4 to 6, the side chamber 40 is connected below the first chamber 32. The side chamber 40 restrains the occupant P from near the right shoulder to at least the chest, but may be configured to restrain the occupant up to the waist. Depending on the direction and timing of the force applied to the occupant to be protected, the side chamber 40 and the first chamber 32 may be configured to deploy simultaneously or one of them may deploy first. As shown in Figs. 6 and 8, inflation gas is released from the inflator 160 housed in the side chamber 40, and the gas flows in the order of the first chamber 32 and / or the side chamber 40, the second chamber 34, the third chamber 36, and the fourth chamber 38.

[0039] As shown in Figs. 4 and 5, the four chambers (32, 34, 36, 38) are deployed to surround the occupant P from the vicinity of the right head to the vicinity of the left head. The second chamber 34 is deployed to bend from the first chamber toward the occupant (inward) and at the same time bend slightly upward, so as to reliably protect the front, including the diagonally forward, part of the head (face) of the occupant P. In addition, since the airbag 30 (at least the first chamber 32 and the fourth chamber 38) is located above the shoulder of the occupant P, it is possible to prevent the shoulder of the occupant P from interfering with the deployment behavior and causing it to deteriorate. In addition, since the airbag 30 is placed on the shoulder of the occupant P, the distance between the airbag 30 and the head of the occupant P can be reduced, and the occupant's head can be quickly restrained.

[0040] 4 and 5, in a top view when the airbag 30 is inflated and deployed, the longitudinal direction of the second chamber 34 is angled from the bent region 200a to extend forward of the occupant P with respect to the longitudinal direction of the first chamber 32, which is long in the front-rear direction. The direction of inflation and deployment of the third chamber 36 from the gas inlet of the third chamber 36 near the terminal end of the second chamber 34 to the gas inlet of the fourth chamber 38 is generally opposite in the front-rear direction to the longitudinal direction of the first chamber 32, and is angled with respect to the longitudinal direction of the inflated and deployed second chamber 34 in a direction approaching the occupant P from the terminal end of the second chamber 34. Furthermore, the direction in which the fourth chamber 38 inflates and deploys from the gas inlet of the fourth chamber 38, which is located near the end of the third chamber 36, is generally opposite in the front-rear direction to the longitudinal direction of the first chamber 32, and is angled in a direction approaching the occupant P from the end of the third chamber 36 with respect to the direction of inflation and deployment of the third chamber 36. With this configuration, the airbag 30 inflates and deploys from one of the shoulders of the occupant P so as to wrap around the head of the occupant P.

[0041] Fig. 7 is a plan view showing the panels (foundation fabrics) forming the first chamber 32 and the second chamber 34. As shown in Fig. 7, the first chamber 32 and the second chamber 34 are integrally formed by bonding together two pieces of foundation fabric 130a (inner panel) and 130b (outer panel). In the figure, reference numeral 132 indicates an area corresponding to the first chamber 32, and 134 indicates an area corresponding to the second chamber. When the first chamber 32 and the second chamber 34 are deployed, the inner panel 130a faces the occupant P side.

[0042] The first chamber 32 (region 132) has an opening 154 that connects to the side chamber 40 and a tab 152 that connects to a tab 164 of the side chamber 40. Inflation gas flows from the side chamber 40 into the first chamber 32 through this opening 154. A vent opening 150a that is in fluid communication with the third chamber 36 is formed in the inner panel near the end of the second chamber 34, and is connected to a vent opening 150b in the inner panel 136a (see FIG. 9) of the third chamber 36 by sewing around the periphery. The vent openings 150a, 150b form the vent hole 37.

[0043] The first chamber 32 is roughly composed of an upper direction section 132a that guides gas flowing in from the opening 154 upward, and a front direction section 132b that is connected to the upper direction section 132a and extends forward. In Fig. 7, the dashed lines other than those of the upper direction section 132a and the front direction section 132b indicate sewing lines.

[0044] In the first chamber 32, the inflation gas first flows into the upper direction portion 132a, so that the first chamber 32 can be quickly and reliably raised to above the shoulders of the occupant P.

[0045] FIG. 8 is a plan view showing a panel (base cloth) forming the side chamber 40. As shown in FIG. 8, the side chamber 40 is formed by bonding two base cloths 140a (inner panel) and 140b (outer panel). In the figure, reference numeral 166 denotes an opening connected to the opening 154a of the first chamber 32, and reference numeral 162 denotes an inflator holding portion for accommodating the inflator 160. Reference numeral 164 denotes a tab connected to the tab 152 of the first chamber 32. This connecting tab 164 is provided on the upper edge of the side chamber 40. The tab 152 of the first chamber 32 is provided on the lower edge of the first chamber, and by connecting these, inadvertent shaking is reduced when the airbags are inflated and deployed, and the stability of the inflation and deployment is increased. In addition, by connecting these, the inflation and deployment directions of the respective airbag cushions do not become different when the airbags are inflated and deployed, and the occupant can be protected more integrally and comprehensively.

[0046] The side chamber 40 and the first chamber 32 are directly connected at their respective openings 154a, 166, and the deployment posture can be controlled by connecting the tabs 152, 166 together. In Fig. 8, the dashed lines other than those for the inflator 160 indicate sewing lines.

[0047] Fig. 9 is a plan view showing a panel (base fabric) that forms the third chamber 36. In Fig. 9, the dashed lines indicate sewing lines.

[0048] As shown in FIG. 9, the third chamber 36 is formed by bonding two base fabrics 136a (inner panel) and 136b (outer panel). Near one end of the inner panel 136a, a vent opening 150b is formed which is connected to the vent opening 150a of the second chamber 34. Near the other end of the inner panel 136a, a vent opening 170a is formed which is connected to the vent opening 170b of the fourth chamber 38. The vent openings 170a and 170b form a vent hole 39 (FIGS. 7 and 9). The vent hole opening 150b is longer in the short side direction than the vent opening 170a, and has a larger opening area.

[0049] Fig. 10 is a plan view showing the panel (base fabric) 138 that forms the fourth chamber 38. In Fig. 10, the dashed lines around the outer edge and the vent opening 170b indicate sewing lines.

[0050] 10(B), the fourth chamber 38 is formed into a bag shape by folding one panel 138 in half. A vent hole 170b that is connected to the vent hole 170a of the third chamber is formed near the center of the panel 138 in the longitudinal direction. The center line of the vent hole 170b along the longitudinal direction becomes the fold line of the panel 138.

[0051] Fig. 11 is a plan view for explaining the connection of the panels shown in Fig. 7 to Fig. 10. Fig. 12 is a plan view showing the connected state of the panels shown in Fig. 7 to Fig. 10. As shown in Fig. 11, the chamber formed by integrating the first chamber 32 and the second chamber 34 is the largest, followed by the side chamber 40. In contrast, the third chamber 36 has a small capacity, and the fourth chamber 38 is designed to have an even smaller capacity.

[0052] The second chamber 34 and the third chamber 36 are connected by sewing only around the periphery of the vent openings 150a and 150b, and the third chamber 36 and the fourth chamber 38 are connected by sewing only around the periphery of the vent openings 170a and 170b.

[0053] (Airbag deployment behavior) In the airbag device 20 according to this embodiment, when a vehicle collision event occurs, the inflator 160 is activated and inflation gas flows from the inflator holding portion 162 at the rear end of the side chamber 40 into the first chamber 32. When the inflation gas flows into the first chamber 32, the upper direction portion 132a (FIG. 7) first inflates, followed by the front direction portion 132b. Next, gas flows from the first chamber 32 into the second chamber 34.

[0054] At this time, since the first chamber 32 and the second chamber 34 or the second chamber 34 and the seat frame are connected by the tether 200 (FIG. 4), the second chamber 34 does not deploy forward, but bends near the boundary with the first chamber 32 and deploys toward the front of the occupant (FIGS. 4 and 5). Also, as shown in FIG. 6, the second chamber 34 bends so that the tip side faces upward, and deploys so that the vent opening 150a is generally vertically long.

[0055] Next, the inflation gas flows from the second chamber 34 to the third chamber 36 through the vent hole 37, and the third chamber 36 deploys in front of the occupant P near the left head. Because the inner panel 134a of the second chamber 34 and the inner panel 136a of the third chamber 36 are connected to each other around the vent hole 37, the behavior of the third chamber 36 deploying to spread outward (away from the occupant's head) is restricted, and a curved shape is created to surround the head of the occupant P.

[0056] Next, the inflation gas flows from the third chamber 36 to the fourth chamber 38 through the vent hole 39, causing the fourth chamber 38 to deploy near the left head of the occupant P. Because the inner panel 136a of the third chamber 36 and the fourth chamber 36 are connected around the vent hole 39, the behavior of the fourth chamber 36 deploying to spread outward (away from the occupant's head) is restricted, and a curved shape is created to surround the head of the occupant P.

[0057] (Other Examples) 13 is a top view showing a deployed state of an airbag 30 in an airbag device according to another embodiment of the present invention. In this embodiment, unlike the above-described embodiment, the first chamber 32 and the second chamber 34 are molded as separate chambers.

[0058] The first chamber 32 is formed by bonding two pieces of base fabric 230a, 230b together. The second chamber 34 is formed by bonding two pieces of base fabric 231a, 231b together. Among the base fabrics forming the first chamber 32, the vicinity of the front end (near the end) of the inner panel 230a facing the occupant P is connected to the vicinity of the end of the inner panel 231a facing the occupant P on the opposite side to the third chamber 36 of the base fabric forming the second chamber 34. A vent hole is formed at the boundary between the first chamber 32 and the second chamber 34.

[0059] In the present invention, a side airbag device for protecting the side of the occupant can be provided on the side of the vehicle seat opposite to the side on which the airbag device 20 is accommodated, in addition to the airbag device 20. For example, the side airbag device can be disposed on the so-called near side, and the airbag device 20, which mainly protects the head, can be provided on the far side, thereby making it possible to thoroughly protect the occupant.

[0060] Although the present invention has been described in conjunction with the above exemplary embodiments, many equivalent modifications and variations will be apparent to those skilled in the art given this disclosure. Accordingly, the above exemplary embodiments of the present invention are considered to be illustrative and not limiting. Various changes may be made to the described embodiments without departing from the spirit and scope of the present invention.

Claims

1. An airbag device accommodated in a vehicle seat, an inflator that generates inflation gas; an airbag that deploys from near the upper end of the vehicle seat to protect the area around the head of an occupant; The airbag includes a first chamber that protects one side of the occupant; a second chamber that is connected to the first chamber and protects the front of the occupant's head; a third chamber that is connected to the second chamber and deploys from the front of the occupant's head to the other side; and a fourth chamber that is connected to the third chamber and deploys on the other side of the occupant. An airbag device, comprising: a first vent hole formed at a connecting portion between the second chamber and the third chamber.

2. 2. The airbag device according to claim 1, wherein the first chamber and the second chamber are integrally formed by bonding two sheets of base fabric together.

3. 3. The airbag device according to claim 2, wherein a bent portion is formed in the vicinity of a boundary between the first chamber and the second chamber, the bent portion being bent in a direction approaching the head of the occupant.

4. 4. The airbag device according to claim 3, wherein a tether is connected to at least the second chamber, and the bent portion is formed by tension of the tether when the airbag is deployed.

5. 2. The airbag device of claim 1, wherein the first chamber and the second chamber are molded as separate chambers.

6. Each of the first chamber and the second chamber is formed by bonding two pieces of base fabric together, 6. The airbag device according to claim 5, wherein a front end of an inner panel facing an occupant of a base fabric forming the first chamber is connected to an end of an inner panel facing an occupant of a base fabric forming the second chamber, the end being located opposite the third chamber.

7. The third chamber is formed by bonding at least two base fabrics together, 7. The airbag device according to claim 1, wherein an end of an inner panel of the base fabric forming the second chamber that faces the occupant is connected to an end of an inner panel of the base fabric forming the third chamber that faces the occupant.

8. An airbag device as described in any one of claims 1 to 6, characterized in that a side airbag device for protecting the side of an occupant is provided separately from the airbag device on the side opposite to the side on which the airbag device is accommodated in the vehicle seat.

9. 7. The airbag device according to claim 1, wherein the fourth chamber is formed by folding one piece of base fabric or by bonding two pieces of base fabric together.

10. An airbag device accommodated in a vehicle seat, an inflator that generates inflation gas; an airbag that deploys from near the upper end of the vehicle seat to protect the area around the head of an occupant; The airbag includes a first chamber that protects one side of the occupant; a second chamber that is connected to the first chamber and protects the front of the occupant's head; a third chamber that is connected to the second chamber and deploys from the front of the occupant's head to the other side; and a fourth chamber that is connected to the third chamber and deploys on the other side of the occupant. An airbag device, comprising: a second vent hole formed at a connecting portion between the third chamber and the fourth chamber.

11. An airbag device accommodated in a vehicle seat, an inflator that generates inflation gas; an airbag that deploys from near the upper end of the vehicle seat to protect the area around the head of an occupant; The airbag includes a first chamber that protects one side of the occupant; a second chamber that is connected to the first chamber and protects the front of the occupant's head; a third chamber that is connected to the second chamber and deploys from the front of the occupant's head to the other side; and a fourth chamber that is connected to the third chamber and deploys on the other side of the occupant. The airbag device according to claim 1, wherein the first chamber includes an upper direction portion that first deploys upward, and a forward direction portion that is connected to the upper direction portion and deploys forward.

12. 12. The airbag device according to claim 11, further comprising a side protection chamber connected to a lower end of the upper portion of the first chamber and configured to protect the sides of the occupant's body.

13. The inflator is disposed within the side protection chamber; 13. The airbag device of claim 12, configured for inflation gas flow from said side guard chamber to said first chamber, said second chamber, said third chamber, and said fourth chamber.

14. An airbag device accommodated in a vehicle seat, an inflator that generates inflation gas; an airbag that deploys from near the upper end of the vehicle seat to protect the area around the head of an occupant; The airbag includes a first chamber that protects one side of the occupant; a second chamber that is connected to the first chamber and protects the front of the occupant's head; a third chamber that is connected to the second chamber and deploys from the front of the occupant's head to the other side; and a fourth chamber that is connected to the third chamber and deploys on the other side of the occupant. the second chamber extends downwardly from the first chamber; An airbag device, wherein an end portion of said second chamber that is connected to said third chamber is bent upward when said airbag is deployed.

15. An airbag device accommodated in a vehicle seat, an inflator that generates inflation gas; an airbag that deploys from near the upper end of the vehicle seat to protect the area around the head of an occupant; The airbag includes a first chamber that protects one side of the occupant; a second chamber that is connected to the first chamber and protects the front of the occupant's head; a third chamber that is connected to the second chamber and deploys from the front of the occupant's head to the other side; and a fourth chamber that is connected to the third chamber and deploys on the other side of the occupant. The first chamber and the second chamber are integrally formed by bonding two base fabrics together, a bent portion is formed in the vicinity of the boundary between the first chamber and the second chamber, the bent portion being bent in a direction approaching the head of an occupant, An airbag device, comprising: a tether connected to at least the second chamber; and a tension of the tether forming the bent portion when the airbag is deployed.

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