| 摘要 |
PROBLEM TO BE SOLVED: To solve such problems that a conventional impact sensor has a large number of part items movement mass such as a spring, a travel space is required in the direction of operation of mass, thereby causing the enlargement of the impact sensor and a structure of a conventional lead switch for approaching magnetism must be changed because the lead switch has high reaction sensitive impact force and reacts by a small impact force. SOLUTION: A permanent magnet 3 is brought close to the lead switch 2 used for approaching magnetism, magnetic bias is given to the lead switch 2, and a magnetic attraction force is overlapped on a travelling force of a movable lead 22 by an impact force to operate the impact sensor by a small impact force.
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