Recordable multilayer optical disk, recording method, reproducing method, and recording apparatus

Abstract

A recordable single-sided two-layer optical disk which is recorded into and reproduced from with light whose wavelength is 405 nm is so configured that, if the front layer is an L0 layer and the inner layer is an L1 layer when viewed from the light entrance surface (or the light-receiving surface), the absorbance of the L1 layer in the wavelength range of 600 to 800 nm is higher than that of the L0 layer. In a part of the L1 layer whose absorbance to light in the range of 600 to 800 nm is high, an area (BCA) in which specific information on the optical disk is to be recorded is provided.

Description

Background technique [0001] One embodiment of the present invention relates to a recordable optical disc having two or more recording layers on each side. More specifically, the present invention relates to a multilayer recordable optical disk having a burn recording area (BCA) recorded as an inner layer when viewed from a light receiving surface. [0002] Typically, BCA recordings use a red laser with a wavelength of 600-800 nm. Because next-generation optical discs suitable for high-definition video recording (such as HD DVD) record and reproduce using blue laser light with a wavelength of about 405 nm, the optical disc is generally insensitive to recording performed by light with a wavelength of 600-800 nm . [0003] Japanese Patent Application Laid-Open No. 2005-4877 discloses a multilayer optical recording medium (see FIG. 2 ) composed of a recording layer material having a plurality of absorption wavelengths (see FIG. 1 ). This patent application describes a conventio...

AI Technical Summary

Problems solved by technology

[0005] Japanese Patent Application Publication No. 2003-211847 also proposes a solution in which the recording layer is multilayer (see the last line of paragraph 0043 of the patent document), but does not show any measures to solve the problem of passing through the multilayer disc. The difficulty of recording BCA from the surface layer (L0 layer) to the inner layer (L1 layer)

[0006] Japanese Patent Application Publication No. 2002-36726, Japanese Patent Application Publication No. 2003-211847, and Japanese Patent Application Publication No. 2006-48771 disclose inventions related to single-layer optical discs, so there is no solution to the problem of penetration through the surface layer ( L0 layer) to the inner layer (L1 layer) to record the measure of the difficult problem of BCA

Images