| 摘要 |
PURPOSE:To simplify the constitution and improve the operability by opposing a movable piece comprising a 3-polar magnetized permanent magnet having the center part thereof magnetized differently from both right and left end parts to a U-shaped core wound with a electromagnetic coil in such a way as to be capable of oscillation via a support spring for the center part thereof. CONSTITUTION:An electromagnetic block A wound with an electromagnetic coil 1 between both magnetic poles of a U-shaped core 3 so set as to have both right and left ends as magnetized parts 3a and 3b is fixed to a device body C. A plate-shaped movable piece 17 is so positioned that both right and left end parts 17a and 17b thereof oppose the right and left magnetized poles 3a and 3b of the core 3, and the movable piece 17 is constituted with a 3-pole magnetized movable permanent magnet 17 having the center thereof magnetized differently from both right and left end parts 17a and 17b. The permanent magnet 17 is so pivotally fitted to the side wall part of the device body C as to be capable of oscillation via support springs 9 and 9 fixed to a center movable bed 8. According to this construction, it is possible to have the movable permanent magnet 17 oscillate smoothly. |
