| 摘要 |
An objective-lens-driving apparatus comprising: a base opposed to a signal surface of an optical disc; an objective-lens holder including an objective lens, first and second focusing coils arranged across the objective lens in a tracking direction of the disc, first and second tracking coils arranged across the first-focusing coil in a tangential direction of the disc, and third and fourth tracking coils arranged across the second-focusing coil in the tangential direction, the objective-lens holder being supported on the base movably in a focusing direction of the disc and the tracking direction; and first to fourth magnets arranged on the base to be respectively opposed in the tangential direction to the first to fourth tracking coils, the first and second magnets each having two poles polarized in the tracking direction, magnetization widths of the two poles with respect to the first-focusing coil in the tracking direction being different from each other. |
