Patent ID: 7131129
Filing Date: 2006-10-31
Classification: G11B

Abstract:
1. An objective lens driver, comprising: a lens holder which holds an objective lens; a lens actuator which supports said lens holder such that said lens holder can be moved in a parallel direction with respect to an optical axis of said objective lens; a first pair of drive coils which generate a drive force to move said objective lens in said parallel direction with respect to said optical axis; a first pair of magnetic circuits which face said first pair of drive coils; a lens carriage in which said lens actuator and at least one of said first pair of magnetic circuits are mounted; a second pair of drive coils which generate a drive force to move said lens carriage in a relatively perpendicular direction with respect to said optical axis; and a second pair of magnetic circuits which face said second pair of drive coils, wherein respective polarities of said first and second pairs of magnetic circuits are set such that a repulsive force therebetween works in a direction opposing the gravitational force, and wherein respective differing polarities of said first magnetic circuits are set to face each other, and respective differing polarities of said second pair of magnetic circuits are also set to face each other.