Patent ID: 7845678

Claim:
An airbag device comprising: an airbag comprising: a restraining portion for restraining an occupant, a proximal end located apart from the restraining portion, and a suction port through which deployment gas is introduced, the airbag being inflated by the deployment gas for deployment to the front of the occupant; a gas supply unit for supplying the deployment gas to the suction port; a tether disposed outside the airbag configured to allow an inner capacity of the airbag to be equal to or smaller than a predetermined value by restricting a distance between the proximal end and an outer surface of the airbag apart from the proximal end at deployment; a control unit configured to acquire capacity set information data that relates to at least one of a seat position on which the occupant is seated, a position of the occupant with respect to an instrument panel, a physique of the occupant, a weight of the occupant, and a magnitude of an impact caused by the collision; a tether release unit activated by the control unit configured to adjust configuration of the airbag by releasing an end portion of the tether at a side of the proximal end according to the capacity set information acquired by the control unit; and a vent that is configured to open in order to at least partially discharge the deployment gas from the airbag before activation of the tether release unit, wherein the vent is configured to close with the activation of the tether release unit to control discharge of the deployment gas from the airbag.