Patent ID: 8174940
Filing Date: 2012-05-08
Classification: G11B

Abstract:
1. An optical disc apparatus, for executing recording or reproducing onto/from an optical disc having “N” pieces of recording layers (N≧3, “N” is an integer), from a first layer to a N th layer, comprising: a light emitting portion, which is configured to emit a laser beam; a light receiving portion, which is configured to receive a laser beam reflected upon, from said optical disc; a correcting portion, which is configured to correct a tilt of said optical disc or an aberration of said laser beam; an adjusting portion, which is configured to obtaining a correction volume of said correcting portion on the corresponding recording layer, upon basis of a reflection light obtained from the recording layer to be a target; a detecting portion, which is configured to detect a layer structure of said optical disc; and a selecting portion, which is configured to select “A” pieces of recording layers (A <N, and “A” is an integer) depending on the layer structure of said optical disc, wherein said adjusting portion obtains said correction volumes on the “A” pieces of recording layers, which are selected by said selecting portion.