Patent ID: 6577583
Filing Date: 2003-06-10
Classification: G11B

Abstract:
An information recording/reproducing apparatus, comprising:a light source a pair of objective lenses that construct two condenser means for generating light spots, using the light source, that correspond to two kinds of optical recording media, which have different thicknesses of a protective layer; a holder that supports the pair of objective lenses; an actuator that focuses and tracking-drives the pair of objective lenses; means for restricting rotational movement of the objective lenses, wherein the means for restricting rotational movement comprises: a magnetizable member provided on the side surface of the holder for controlling a position of the pair of the objective lenses; and a magnetic circuit, having a permanent magnet, that forms a space between the magnetizable member and the permanent magnet, wherein: the holder is disposed to rotate on a rotation center shaft and to slide in an axial direction parallel to the rotation center shaft, a plane of the holder is disposed opposite to a plane of a recording medium, and the pair of objective lenses is disposed at a surface of the holder such that an angle between the rotation center shaft and a center of each objective lens is 90 degrees or less.