| 摘要 |
PURPOSE:To obtain an inexpensive acceleration sensor which requires no excessively high size accuracy to realize a proper dumping function with a simple structure. CONSTITUTION:When an inertial body 56 linearly moves by inertia upon receipt of an acceleration, the inertial moving amount of the inertial body 56 is increased, and accordingly a crossing angle 6 of an anti-inertial moving direction B and an urging direction A of an urging force F generating a component of force R in the anti-inertial moving direction B to resist the inertial movement is enlarged. The component of force R in the anti-inertial moving direction is large when the inertial moving amount of the inertial body 56 is small, whereas it is gradually decreased as the inertial moving amount is increased. In consequence, the inertial body 56 does not attain a predetermined inertial moving amount to actuate an air bag device at an acceleration of a short working time to the inertial body when a vehicle runs a bad road or the like. However, the inertial body 56 reaches the predetermined inertial moving amount at an acceleration of a long working time due to the sudden deceleration of the vehicle because of tone necessity to actually drive the air bag device, so that a dumping function to decelerate the inertial body 56 is positively exerted. |
