Patent ID: 7458086
Filing Date: 2008-11-25
Classification: G11B

Abstract:
1. An actuator used with an optical pickup, the actuator comprising: a base on which a holder is fixed; a lens holder in which a plurality of installation holes are formed such that a plurality of objective lenses, to record and/or reproduce optical discs having different recording densities, are installed at different heights; a support member, which movably supports the lens holder, having one end coupled to the lens holder and the other end coupled to the holder; and a magnetic circuit which drives the lens holder in focusing and tracking directions, the plurality of installation holes include a first installation hole in which a first objective lens for at least one type of low density optical disc is installed, and a second installation hole in which a second objective lens for a high density optical disc is installed, wherein when a working distance of the first objective lens for the low density optical disc installed in the first installation hole is represented as WD separation distance between an optical disc of the second objective lens=WD where, α=|WD and the second installation hole is located in a more outer circumference of the optical disc than the first installation hole.