| 摘要 |
PROBLEM TO BE SOLVED: To make possible obtaining driving force in the focusing direction, the driving force in the tracking direction, and restorative force in the two directions of the focusing direction and tracking direction with a pair of magnets. SOLUTION: A holder 1 of an objective lens 2 is attached to a support shaft 10 turnably and slidably, and a focusing drive coil 4a and tracking drive coils 5a, 5b are attached to the holder 1. The support shaft 10 is fixed with outer yokes 8 with circular arc both sides, and the magnets 11 opposite to the 4a, 5a, 5b are attached to their insides, and a magnetic piece 3a with a left/right length longer than the magnet 11 is attached to the position being end parts of upper/lower two parts and opposite to the upper end and the lower end of the magnet 11. The magnet 11 is single pole magnetized for the 4a, 5a, 5b and 3a. When a drive current flows through the 4a, 5a, 5b, the objective lens 2 is moved in the tracking and focusing directions, and when this current is interrupted, the lens 2 is held to a neutral position by the magnetic piece 3a. |
