| 摘要 |
PURPOSE:To make a special reproducing operation possible, by supporting an object lens in a displaceable state toward the direction of the disc diameter and by moving this object lens during the flyback time. CONSTITUTION:A holding frame 12 to hold an object lens 11 is formed with magnetic materials and is fitted to an inside frame 18 by a pair of flat springs 13 and 13'. This inside frame 18 is fitted to an outside frame 20 by a pair of spiral round springs 15 and 15'. The first and the second yokes 15 and 15' which cooperate with the holding frame 12 and permanent magnets 16 and 16' are fixed to the outside frame 20. A coil 22 is wound around a ring 21 in one body together with the inside frame 18, and a permanent magnet 23 and yokes 24 and 25 are fitted to the outside frame 20. In this structure, a current corresponding to tracking error is flowed to the first and the second coils 17 and 17' during the vertical flyback period to move the object lens, thereby performing a special reproducing operation. |
