Airbag apparatus and method of manufacturing airbag

1. An airbag apparatus comprising:

an airbag disposed in front of a passenger to be inflated toward a rear side of a vehicle for protecting the passenger in case of a vehicle accident, said airbag including a center side airbag section located in a center area of the vehicle in a width direction of the vehicle, said center side airbag section extending vertically at the center area of the vehicle in an inflated state and having highest and lowest portions in a vertical direction and front and rear portions in a front-rear direction of a vehicle, a window side airbag section located at a window side of the vehicle in the width direction, said window side airbag section extending vertically at a window side of the vehicle in the inflated state and having highest and lowest portions in the vertical direction and front and rear portions in the front-rear direction, and an upper edge extending between the center side airbag section and the window side airbag section in the inflated state, said upper edge at the window side airbag section being lower than that at the center side airbag section so that the window side airbag section does not interfere with a side portion of the vehicle, and

a gas supply device for supplying gas to inflate the vehicle airbag,

wherein a length between the highest and lowest portions of the center side airbag section is greater than a length between the front and rear portions of the center side airbag section, and a length between the highest and lowest portions of the window side airbag section is greater than a length between the front and rear portions of the window side airbag section.

2. An airbag apparatus according to claim 1 , wherein said upper edge is located at a front side of the airbag facing the passenger and decreases its height linearly from the center side airbag section to the window side airbag section, and a lower edge at the front side of the airbag extends between the center side airbag section and the window side airbag section and is arranged substantially horizontally when viewed from the front side in the inflated state.

3. An airbag apparatus according to claim 2 , wherein said airbag further includes a middle airbag section situated between the center and window side airbag sections.

4. An airbag apparatus according to claim 3 , wherein said middle airbag section is located close to the passenger than the center side and window side airbag sections in the inflated state.

5. An airbag apparatus according to claim 3 , wherein said center side airbag section has an upper side and a lower side, and said window side airbag section has an upper side and a lower side; said lower sides of the center and window side airbag sections have a shape and a size substantially same; and said upper sides of the center and window side airbag sections have a shape similar to each other and the size of the upper side of the center side airbag section is greater than that of the window side airbag section.

6. An airbag apparatus according to claim 5 , wherein said front side facing the passenger has an upper portion and a lower portion at the center and window side airbag sections, the upper portion at the center side airbag section extending further rearward of the vehicle from that of the window side airbag section, the lower portions of the center and window side airbag sections having a shape substantially same and symmetrical to front lower sides of the center and window side airbag sections.

7. An airbag apparatus according to claim 1 , wherein said center side airbag section comprises a center side panel having said highest and lowest portions in a vertical direction and said front and rear portions in the front*rear direction, and said window side airbag section comprises a window side panel having said highest and lowest portions in the vertical direction and said front and rear portions in the front-rear direction.

8. A method of manufacturing an airbag, comprising:

preparing a first panel corresponding to a center side airbag section to be located at a center area of a vehicle in a width direction, a second panel corresponding to a window side airbag section to be located at a window side of the vehicle in the width direction, and a third panel, said second panel being smaller than the first panel and formed asymmetrically with respect to the first panel,

fabricating the first and second panels so that the first panel has a vertical length greater than that of the second panel, and

connecting the first, second and third panels to form a bag-shaped airbag, said third panel being interposed between the first and second panels so that an upper edge extends between the center side airbag section and the window side airbag section, is located in a highest portion of the airbag in an inflated state and decreases from the center side airbag section to the window side airbag section in the inflated state.

9. A method of manufacturing an airbag according to claim 8 , wherein said first and second panels are prepared such that the center side airbag section has an upper side and a lower side, and said window side airbag section has an upper side and a lower side; said lower sides of the center and window side airbag sections have a shape and a size substantially same; and said upper sides of the center and window side airbag sections have a shape similar to each other and the size of the upper side of the center side airbag section is greater than that of the window side airbag section.

10. An airbag apparatus comprising:

an airbag disposed in front of a passenger to be inflated toward a rear side of a vehicle for protecting the passenger in case of a vehicle accident, said airbag including a center side airbag section located in a center area of the vehicle in a width direction of the vehicle, said center side airbag section extending vertically at the center area of the vehicle in an inflated state in a front-rear direction, a window side airbag section located at a window side of the vehicle in the width direction, said window side airbag section extending vertically at a window side of the vehicle in the inflated state in the front-rear direction, and an upper edge extending between the center side airbag section and the window side airbag section in the inflated state, said upper edge at the window side airbag section being lower than that at the center side airbag section so that the window side airbag section does not interfere with a side portion of the vehicle, and

a gas supply device for supplying gas to inflate the vehicle airbag,

wherein said airbag further includes a front side facing the passenger, a curved upper portion extending from the front side to a back side at a side opposite to the front side through the upper edge, and a curved lower portion extending from the front side to the back side through a lower edge extending substantially horizontally in the inflated state,

the curved upper portion has a size greater than that of the curved lower portion when viewed from a side of the airbag, and

the curved lower portion at the center side airbag section has a shape same as that of the window side airbag section, and has a semi-circular shape.

11. An airbag apparatus according to claim 10 , wherein said center side airbag section comprises a center side panel having highest and lowest portions in a vertical direction and front and rear portions in the front-rear direction, a length between the highest and lowest portions in the center side panel being greater than a length between the front and rear portions in the center side panel, and

said window side airbag section comprises a window side panel having highest and lowest portions in the vertical direction and front and rear portions in the front-rear direction, a length between the highest and lowest portions in the window side panel being greater than a length between the front and rear portions in the window side panel.