| 摘要 |
PURPOSE:To simplify the driving mechanism of tracking and tangential correction, by driving a condenser lens with a coil wound around the optical axis of the condenser lens and a parallel concentrated line bundle in parallel with the optical axis. CONSTITUTION:A focusing coil 11 wound around the optical axis is given to the lower part of a condencer lens 10, and parallel concentrated line bundles 12, 12', 13 and 13' to the optical axis are fitted to four sides around the coil 11. The concentrated line bundles are straight line conductors bundled in parallel and electrically connected at both ends, and direction of current is opposite at upper and lower parts for the opposing side of the concentrated line bundles. The magnetic flux by a magnet 15 radially interlinks the coil 11. Tracking and tangential correction is made by energizing the concentrated line bundles 12, 12', 13 and 13'. |
