| 摘要 |
In an optical pickup actuator, a lens holder has an objective lens and a penetrating hole for placing the objective lens. A pair of bobbins make contact with both side surfaces of the lens holder. A focusing coil and a tracking coil are wound around each of the bobbins in orthogonal directions to each other. A bottom plate spaced under the lens holder is installed. A pair of yokes are formed upwardly on the bottom plate at the outsides of the bobbins. A pair of magnets are formed on inside surfaces of the yokes for giving magnetic flux to the focusing and tracking coils. The magnetic flux has an effect only on some coil portion between the bobbin and the magnet, however it has no effect on another coil portion of the bobbin opposite to the magnet. The bobbins serve as internal yokes. A lens holder suspension part has a suspension supporting plate on the bottom plate and a suspension PCB fixed therewith. A pair of coil PCBs are fixed at both side surfaces of the lens holder and connected with both ends of the tracking coil and the focusing coil. The lens holder is floated by suspension wires of which both ends are connected with the suspension PCB and the coil PCBs.
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