| 摘要 |
PURPOSE:To reduce the size of structure by exercising focus control and track control by the same magnetic circuit while using two cubic coils. CONSTITUTION:A cubic coil 9' for focus control movable at right angles to a disk recording surface, and a cubic coil 10 for track control parallel to the disk recording surface and movable at right angle to a recording track direction are are provided by insertion at both ends of a soft iron yoke 12 between soft iron yokes 11 and 13 while they are L-shaped and arrayed successively at constant intervals, and permanent magnets 14 and 15 are inserted into the array gaps of the soft iron yokes 11, 12 and 13. Those yokes 11, 12 and 13 and permanent magnets 14 and 15 constitute a magnetic circuit, and both said coils 9' and 10 are driven to reciprocate independently between both the ends of the soft iron yoke 12 as axes by electric conduction. |
