Patent ID: 7313799
Filing Date: 2007-12-25
Classification: G11B

Abstract:
1. An optical disk apparatus including an objective-lens for converging light on a recording surface of an optical disk, and an objective-lens driving device for driving the objective-lens in a focusing direction and a tracking direction, wherein the objective-lens driving device includes a focusing coil having four edges to enclose the objective-lens, and two pairs of permanent magnets, the two pairs of permanent magnets being arranged so that polarities thereof become identical to sides of focusing coil, one pair of the permanent magnets being arranged opposed to an edge of the focusing coil, an other pair of the permanent magnets being arranged opposed to an edge opposite to the edge of the focusing coil, and an interval between two magnets constituting the one pair of permanent magnets is narrower than an interval between two magnets constituting the other pair of permanent magnets.