| 摘要 |
PROBLEM TO BE SOLVED: To provide a permanent magnet the spring characteristics of which can be easily changed if necessary without being required to continue to constantly consume power.SOLUTION: A permanent magnet 1 is provided on an end on the opposite side of a side where a movable element 4 is provided in a counter space between a yoke part 2 and a yoke part 3. The permanent magnet 1 is arranged in such a way that one magnetic pole is brought close to or into contact with the yoke part 2, and the other magnetic pole is brought close to or into contact with the yoke part 3. The movable element 4 is provided to be movable in an axial direction while a position of an axial center O of the movable element 4 is regulated. By employing constitution in which the permanent magnet 1 and the movable element 4 are independently provided, the spring characteristics can be easily changed if necessary by replacing only the permanent magnet 1 while leaving the movable element 4 as it is, etc. |
