| 摘要 |
PROBLEM TO BE SOLVED: To make design easy and to improve reliability in operation control of an objective lens drive apparatus. SOLUTION: The objective drive apparatus 8 is provided with a fixed block 10 fixed to a movement base 7, a movable block 11 operated in the focusing direction, the tracking direction, and the tilt direction, and holding two objective lenses 18, 19, and supporting springs 1, 15 coupling the fixed block and the movable block, the movable block is provided with a pair of coil bodies 17, 17 energized at the time of operation of the movable block in the focusing direction, the tracking direction, or the tilt direction and divided in the radial direction holding the objective lens between them and arranged, a lens center P of one side of the objective lenses is positioned corresponding to a first line segment Lr extended to the radial direction through a rotary center of a disk table 3, a lens center Q of the other side of the objective lenses is positioned at a position being deviated from the first line segment and at a position of the disk table side more than a second line segment Lt extended to the tangential direction and passing through the lens center of one side of the objective lenses. COPYRIGHT: (C)2006,JPO&NCIPI
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