Patent ID: 7969828

Claim:
An optical pickup actuator, comprising: a base; a lens holder movably installed on the base, and mounted with an objective lens emitting a light to an optical information recording medium; and a magnetic circuit independently driving the lens holder in a focusing direction, a tilting direction and a tracking direction, wherein the magnetic circuit comprises: a focusing coil installed on the lens holder; no more than a pair of tilting coils installed on the lens holder, and driving independently of each other; at least one pair of tracking coils installed on the lens holder, and driving independently of each other; outer yokes installed outside the focusing coil and outside the tilting coils; and inner yokes installed inside the focusing coil and inside the tilting coils, wherein the inner yokes comprise: a first inner yoke pair disposed inside one of the pair of tilting coils; a second inner yoke pair disposed inside the other one of the pair of tilting coils, and a third inner yoke pair disposed between the first inner yoke pair and the second inner yoke pair; and magnets interacting with the focusing coil, the tilting coils and the tracking coils, to generate driving forces in the focusing direction, the tilting direction and the tracking direction, wherein the focusing coil and the tilting coils are tightly attached to an inner wall of the lens holder so that the rigidity of the lens holder is reinforced, and wherein the focusing coil and the tilting coils are vertically layered with respect to one another in the focusing direction within the lens holder such that the tilting coils are positioned above the focusing coil.