| 摘要 |
PURPOSE:To insure the distortion of a phase against appearing in a delay direction by positioning the center of gravity position of a tracking movable part below the center position of tracking drive force acting by a tracking drive coil. CONSTITUTION:When an objective lens 10 is driven in all directions to follow and control a light converged position on the recording track of an optical magnetic disk 6, reaction acting on a tracking magnetic circuit 18 will not be transmitted to an intermediate supporting body 13 because said circuit 18 is fixed on a fixed supporting body 19. Since there is no rotating force directly applying to a focus movable part 38, the distortion of a phase will not appear in the delay direction by adjusting the center gravity position of the tracking movable part 23 so as to position below the center position of the tracing drive force, even if the center gravity position of the tracking movable part 23 deviates from the center position of the tracking drive force acting on a tracking drive coil 21 and rotating resonance occurs. |
