| 摘要 |
<p>PURPOSE: To provide a magnetic latch device which is useable for a spectrum analyzer or other devices where accurate signal switching is important and which ensures simple operation and high efficiency and in which friction between moving parts is negligible small by providing a core, a coil, a permanent magnet, and an armature. CONSTITUTION: This device comprises a magnetically conductive rod shaped core 14, a coil 30 wound around the core 14, a permanent magnet 50 in contact with the core 14, and an armature 80 magnetically coupled with the permanent magnet 50 and having ends 84, 86 formed to make contact with opposite ends of the core 14. The ends 84, 86 of the armature 80 are set to make contact with only any one end 18, 20 of the core 14. For example, once the coil 30 receives the opposite polarity electric pulse from the state where a gap between the ends 84 and 18 is formed, balance of latching force is reversed, and the armature 80 is moved to an opposite position to permit the end 86 of the armature 80 to make contact with the end 20 of the core 14. When no electric pulse is applied, a magnetic flux of the permanent magnet 50 keeps the armature 80 at a state where a finally applied pulse forms.</p> |
