| 摘要 |
An actuator for an optical pick-up, including: a holder (11) fixed to a base (10); a bobbin (20) capable of accommodating a plurality of objective lenses (31, 33) for recording and/or reproducing information onto and/or from optical discs with different recording densities; a suspension (13) for connecting the bobbin (20) and the holder (11), and supporting the bobbin (20) to be movable; and a magnetic circuit for driving the bobbin (20) In focusing, tilting, and tracking directions, wherein the magnetic circuit includes a plurality of focusing/tilting coils (41, 43) installed in the bobbin (20) to be in correspondence to the plurality of lenses (31, 33), and driving the bobbin (20) in at least one of focusing and tilting directions; a plurality of magnets (61, 63) having the focusing/tilting colls (41, 43) therebetween, in which same polarities of the magnets (61, 63) make one pair: and tracking coils (41, 43) supported by the bobbin (20), and generating a driving force to drive the bobbin (20) in the tracking direction. |
