Patent ID: 6785064
Filing Date: 2004-08-31
Classification: G02B

Abstract:
An objective lens unit comprising:a base frame having a supporting shaft provided uprightly on a center thereof; a lens holder having a boss portion formed in a center thereof and fitted to the supporting shaft so as to be slidable along a direction of an axis of the supporting shaft and to be capable of oscillating about the axis; a focusing coil externally fitted on the boss portion; a pair of tracking coils respectively disposed on both side surfaces of the lens holder, each tracking coil having a central hole; a pair of magnets respectively disposed on both side portions of the base frame with the lens holder interposed therebetween; reinforcing frame portions formed along an outer peripheral surface of each of the tracking coils by applying an epoxy resin adhesive to portions between the lens holder and the outer peripheral surface of each of the tracking coils; reinforcing core portions formed by filling the epoxy resin adhesive into the central hole of each of the tracking coils; and a reinforcing connecting portion formed by filling the epoxy resin adhesive into a gap defined by the lens holder, each of the tracking coils, and the focusing coil.