| 摘要 |
<p>PURPOSE:To reduce an electric power consumption and to miniaturize by arranging an electromagnetic coil winding on a movable iron core, a permanent magnet magnetized at right angles to the axis of the movable iron core, and the yoke forming a magnetic cavity with the movable iron core. CONSTITUTION:When an electromagnetic coil 4 is not excited, a magnetic flux phi1 of a permanent magnet 5 flows in a magnetic circuit and one end 2a of a movable iron core 2 is attracted to a bottom 30a against the spring power of a coil spring 40. When the electromagnetic coil 4 is excited, a magnetic flux phi2 flows. Thus, the magnetic flux phi1 and the magnetic flux phi2 decay each other in a magnetic cavity A formed by a yoke. Consequently the movable iron core 2 is moved in the direction of an arrow W by a spring power of the coil spring 40. A lever 41 moves down in accordance with the movement of the movable iron core 2, and a projection 42a of a push button 42 is depressed by the pressing part 41a of the lever 41. When the electromagnetic coil 4 is deexcited, it returns to an original condition.</p> |
