Patent ID: 7656756
Filing Date: 2010-02-02
Classification: G11B

Abstract:
1. An optical pickup actuator, comprising: a lens holder to which tracking and focusing coils are attached, at least one of the coils being a non-rectangular polygon coil having at least two sides that are different in length from each other; a plurality of magnets disposed facing the tracking and focusing coils; and a rotation preventing device formed on the lens holder, the rotation preventing device surface-contacting an inner surface of the non-rectangular polygon coil to prevent the non-rectangular polygon coil from being twisted, wherein the rotation preventing device comprises at least two rotation preventing projections including an upper rotation preventing projection formed in the shape of an asymmetrical structure corresponding to the shape of the non-rectangular polygon coil and a lower rotation preventing projection formed in the shape of an asymmetrical structure corresponding to the shape of the non-rectangular polygon coil, and wherein the lower rotation preventing projection surface-contacts only the inner surface of a bottom of the non-rectangular polygon coil and has a surface-contacting width greater than ⅓ of the inner surface of the bottom of the non-rectangular polygon coil and less than the entire width of the inner surface of the bottom of the non-rectangular polygon coil.