Patent ID: 7986611

Claim:
A method for manufacturing an optical recording medium including a high-density information layer, said method comprising the steps of: (a) forming a first substrate structure including a first substrate having a first surface including a pattern of pits and lands thereon and a reflective film over said first surface of said first substrate, said first substrate being formed of a material that does not bond well with said reflective film; (b) forming a second substrate structure having a thickness of 1.0 mm or more and including one or more information layers, said second substrate structure further including a non-read side from which information in the second substrate structure is not read and a read side from which said information in the second substrate structure is read; (c) depositing an adhesive layer on said non-read side of said second substrate structure; (d) bonding said first substrate structure and said second substrate structure together, with said first surface of said first substrate structure including said pattern of pits and lands thereon over which said reflective film is formed adhering via the adhesive to the non-read side of said second substrate structure; (e) separating said first substrate from said second substrate structure, with said reflective film remaining adhered to said second substrate structure as an additional information layer, said additional information layer remaining adhered to said second substrate structure having information capacity of 23 GB or more and comprising an information track having pits with a minimum length along the track in a range of 138 nm to 160 nm, and information marks configured for reading using a laser with a wavelength in a range of 400 nm to 420 nm and a numerical aperture of 0.85 from a direction opposite said read side of said second substrate structure; and (f) forming a cover layer over said reflective film.