| 摘要 |
An objective lens holder is movably attached at a fixing portion of a base by means of a support body for driving the objective lens. A pair of arched permanent magnets are fixed along an arched outer circumference of the objective lens holder. Focusing coils and tracking coils are fixed on the base to oppose, with a small gap, the permanent magnets. The objective lens holder can slide in the focusing direction along an axial line parallel to the optical axis of the objective lens, and it is also rotatable in the tracking direction about the axial line. Since the gap between the permanent magnets and each of the coils is minimized, the electromagnetic force generated in each coil can be fully utilized, and sensitivity of the control signal applied to each coil is improved. Further, the size of the optical pickup apparatus in which the objective lens driving apparatus is incorporated is reduced.
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