| 摘要 |
PROBLEM TO BE SOLVED: To provide a shock sensor which has a proper switching operation property according to the magnitude of an acceleration due to a shock and whose stability and reliability are enhanced in the fundamental operation of an air bag system which can control the expansion of an air bag without any malfunction. SOLUTION: In the shock sensor 13, a pair of reed switches 6a, 6b whose constitutions are mutually identical and which comprise independent signal output systems are arranged in positions in which their contact parts become a closed state so as to correspond to accelerations of different magnitudes, and their sensor sensitivities are different. When a weak acceleration is generated due to the shock, a ring-shaped magnet 7 is moved by overcoming an urging force by a spring 8, it is brought close to only the reed switch 6a, and only the contact part of the reed switch 6a is set to a closed state. When a strong acceleration is generated due to the shock, the ring-shaped magnet 7 is brought close to the reed switches 6a, 6b, and the contact parts of the reed switches 6a, 6b are set to a closed state. |
