Patent ID: 7859774

Claim:
An objective lens actuator for driving an objective lens in a focusing direction and a tracking direction, so as to focus lights on a recording surface of an optical disc, as a recording medium of information, comprising: a magnet; a lens holder, which is configured to hold said lens thereon; and four (4) pieces of tracking coils are disposed in a line on a side surface of said lens holder for holding said objective lens thereon, facing to said magnet; wherein said four (4) pieces of tracking coils are connected in series, lengths of coil wires per one (1) turn of said four (4) pieces of tracking coils are equal to each other, and the number of turns of two (2) pieces of tracking coils lying on an outside far from said objective lens among said four (4) pieces of tracking coils is less than the number of turns of two (2) pieces of tracking coils lying in an outside near to said objective lens among said four (4) pieces of tracking coils.