Patent ID: 8000198
Filing Date: 2011-08-16
Classification: G11B

Abstract:
1. A reproduction method for reproducing information recorded on a rewritable multilayer phase-change type optical recording medium having at least a first recording structure layer, a resin intermediate layer, a second recording structure layer and a cover substrate sequentially formed on a substrate, the method comprising: setting a first power of a reproduction light beam for use with the rewritable multilayer phase-change type optical recording medium that is higher than a second power of the reproduction light beam for use with a reproduction only multilayer phase-change type optical recording medium; reproducing information recorded on said first and second recording structure layers of said rewritable multilayer phase-change type optical recording medium using the reproduction light beam having the first power; setting a start position of a focusing operation of an objective lens of an optical pickup device so that a focal point of a light beam outgoing from the objective lens is beyond a first recording layer of said first recording structure layer; and after setting the start position of the focusing operation, shifting the focal point toward the first recording layer to perform a focal position adjustment.