| 摘要 |
In an optical disk drive selectively operable with different kinds of optical disks, an objective lens actuator assembly includes a plurality of objective lenses each assigned to a particular kind of optical disk for converging a laser beam issuing from a light source onto the recording surface of the optical disk. A disk-like lens holder supports the objective lenses on a single circle thereon. A chassis supports the lens holder such that the holder is freely rotatable and freely movable back and forth along its axis of rotation. A focusing actuator is mounted on the chassis for causing the lens holder to move along the axis of rotation. A tracking actuator causes the lens holder to rotate for thereby positioning the lenses. The tracking actuator has a single tracking coil affixed to the circumferential edge of the lens holder, and a plurality of magnets each attracting or repulsing the coil when current is fed to the coil. The magnets adjoin the circumferential edge of the lens holder and are mounted on the chassis in association with the lenses.
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