Patent ID: 7370882

Claim:
An air bag system comprising: an air bag which is inflatable in the shape of a curtain stored in a folded state in a vehicle, the air bag comprising a front-seat inflatable portion and a rear-seat inflatable portion which are arranged in a longitudinal direction of the vehicle, said front-seat inflatable portion and rear-seat inflatable portion being connected by a gas passage; an inflator which supplies a gas into the air bag so that the air bag is inflated to protect an occupant of the vehicle; and a diffuser through which the gas is supplied from the inflator into the air bag, wherein the diffuser is only provided in a generally middle portion of the air bag with respect to the longitudinal direction, wherein the diffuser is disposed on only one side of the inflator such that the diffuser and the inflator are substantially aligned with each other; the diffuser open only to the inflator at one distal end thereof, and is closed at another distal end thereof, which is opposite to the one distal end, the diffuser includes a gas feed portion that is provided between the one distal end and other distal end of the diffuser, and that is exposed to a gas inlet formed in a generally middle portion of the air bag with respect to the longitudinal direction, the gas feed portion is formed in a lower surrounding wall of the diffuser that extends in a longitudinal direction thereof, the diffuser supplies gas to the gas passage through the gas feed portion; and a length of the diffuser in the longitudinal direction is smaller than a length of the gas passage in the longitudinal direction.