Seatbelt airbag

A seatbelt airbag comprising:

• a diaphragm configured to divide an internal space of an airbag cushion in a deployed state into a first chamber and a second chamber, the airbag cushion being configured to be deployed from a seatbelt;
• a first support part disposed at a lower side of the first chamber, wherein the first support part has a first shape that widens toward a front side of a passenger and is configured to be supported on thighs of the passenger;
• a second support part disposed at an upper side of the second chamber, wherein the second support part has a second shape that widens toward the passenger and is configured to support a head of the passenger;
• and
• a deployment adjustment device configured to adjust an operation of deploying the first chamber and the second chamber in accordance with a seat arrangement, the deployment adjustment device comprising:
• an active vent having a hole shape disposed in the diaphragm;
• a tether having a first end connected to the active vent, the tether being configured to close the active vent in a state in which tension is applied as the tether is pulled in a direction in which the airbag cushion is deployed in a case in which the airbag cushion is deployed;
• an active actuator connected to a second end of the tether and configured to apply the tension to the tether and to eliminate the tension by operating to be disconnected from the tether;
• and
• a controller configured to perform control to selectively operate the active actuator in accordance with a seat position.

A seatbelt airbag comprising:

• a diaphragm configured to divide an internal space of an airbag cushion in a deployed state into a first chamber and a second chamber, the airbag cushion being configured to be deployed from a seatbelt;
• a first support part disposed at a lower side of the first chamber, wherein the first support part has a first shape that widens toward a front side of a passenger and is configured to be supported on thighs of the passenger;
• a second support part disposed at an upper side of the second chamber, wherein the second support part has a second shape that widens toward the passenger and is configured to support a head of the passenger;
• and
• a deployment adjustment device configured to adjust an operation of deploying the first chamber and the second chamber in accordance with a seat arrangement, the deployment adjustment device comprising:
• an active vent having a hole shape disposed in the diaphragm;
• a tether having a first end connected to the active vent, the tether being configured to be pulled in a direction in which the airbag cushion is deployed in a case in which the airbag cushion is deployed;
• and
• a tether fixing part to which a second end of the tether is normally fixed, the tether fixing part being configured not to be changed in position in a state in which the seat arrangement is changed;
• wherein a marginal length of the tether extending from the tether fixing part to the active vent is a length by which the tether is pulled to close the active vent at a time of switching to a first seat arrangement that satisfies a leg protection condition for the passenger;
• and
• wherein the marginal length of the tether is a length by which an open state of the active vent is maintained even though the tether is pulled at the time of switching to a second seat arrangement that satisfies a head protection condition for the passenger.