| 摘要 |
PURPOSE:To improve the oscillation characteristic of a flat positioner to position a disc in a high speed, by constituting of a compensating magnetic circuit where magnets are arranged to face each other so as to be generate a force in the direction to cancel the force generated by the leakage magnetic flux from a magnetic circuit of the flat positioner. CONSTITUTION:A compensating magnetic circuit where magents 14 and 14', which generate forces 13 and 13' having directions to cancel driving forces 12 and 12' generated by megnets 2 and 2', are arranged is provided. When a current 10 is applied to a flat coil, driving forces are generated in directions of arrows 11 and 11' by magnets 2 and 2' of the magnetic circuit, and simultaneously, forces in directions of arrows 12 and 12' are generated in a part of the flat coil, which is not put in the magnet gap part, by the leakage magnetic flux in parts other than the gap part of magnets 2 and 2' of the magnetic circuit, but forces 13 and 13' in directions to cancel said generated forces 12 and 12' are generated by magnets 14 and 14'. |
