| 摘要 |
An objective lens drive device ( 8 ) includes a supporting block ( 9 ), a movable block ( 10 ) for holding an objective lens ( 27 ), and supporting springs ( 22 ) for connecting the supporting block and the movable block. Elements of the supporting block of the objective lens drive device ( 8 ) are a stationary section ( 11 ), a supporting shaft ( 12 ), a tilt drive section ( 13 ), and tilt drive magnetic circuits ( 20 and 20 ). The stationary section ( 11 ) is secured to a movable base ( 7 ) that is movable in radial directions of a disc-shaped recording medium ( 100 ). An axial direction of the supporting shaft ( 12 ) is perpendicular to both focusing directions and tracking directions. The tilt drive section ( 13 ) is rotatably supported at the stationary section through the supporting shaft and is connected to the movable block through the supporting springs. The tilt drive magnetic circuits ( 20 and 20 ) are used to rotate the tilt drive section with respect to the stationary section.
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