| 摘要 |
PURPOSE:To decrease the number of parts that move mechanically and to reduce the access time, by connecting plural auxiliary magnetic poles to a common magnetic pole having an energizing winding and at the same time providing a by-pass magnetic path which can touch and detach to each auxiliary magnetic pole and the common magnetic pole. CONSTITUTION:Plural auxiliary magnetic poles 11 are connected to a common magnetic pole 12 having an energizing winding 14, and at the same time a by-pass magnetic path 13 which is set to the outside of the winding 14 and also can freely touch and detach to the pole 11 or 12 is provided to each pole 11 and the pole 12 respectively. In case when the path 13 touches the poles 11 and 12 at its both ends, the magnetic flux closes through the path 13. Thus the amount of the magnetic flux generated from the tip of the pole 11 is extremely reduced. If each path 13 can independently move toward an arrow and only a specific path 13 is detached from the auxiliary magnetic pole with other paths kept to touch the auxiliary poles, the magnetic flux is dispersed only from the pole 11 having no touch to the path 13. As a result, the magnetic recording becomes possible. |
