| 摘要 |
An optical recording and/or reproducing apparatus has an actuator for an optical pickup. The actuator includes a base (10) on which a holder (11) is fixed, a bobbin (20), a support member (13), and a magnetic circuit. A plurality of installation holes (21, 25) are formed in the bobbin (20) such that a plurality of objective lenses (31, 35) for recording and/or reproducing optical discs having different recording densities are installed at different heights. The support member (13) having one end coupled to the bobbin (20) and the other end coupled to the holder (11) supports movably the bobbin (20). The magnetic circuit drives the bobbin (20) in focusing and tracking directions. The magnetic circuit is divided into a first magnetic circuit (51) for driving the objective lenses (31, 35) in the focusing direction, and a second magnetic circuit (55) for driving the objective lenses (31, 35) in the tracking direction, thereby reducing the weight of a moving portion. The actuator for an optical pickup according to the present invention has a structure in which two objective lenses (31, 35) are installed in one bobbin (20), and a device required to rotate the objective lenses (31, 35) simultaneously with a predetermined angle with respect to the rotation axis, unlike a conventional actuator for presenting an axis perturbation type, is not required, and thus the entire structure of the actuator is simplified. <IMAGE>
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