Optical recording medium and manufacturing method of the same
AssigneeSony Corporation
InventorsTakeshi Yoshida, Minoru Kikuchi, Akio Koshita
Life of this patent
Estimating the term…
Abstract
Provided is an optical recording medium including: two discs, each of which includes a substrate and a plurality of recording layers; and an attachment layer which is provided between the two discs and includes ultraviolet curable resin, wherein thickness of each of the substrates in the two discs is equal to or greater than 0.3 mm and equal to or less than 0.545 mm, wherein transmittance of the two discs is equal to or less than 20%, and wherein inversion rates on both surface sides of the attachment layer are equal or substantially equal to each other, and are equal to or greater than 70%.
Claims12
An optical recording medium comprising:
- two discs, each of which includes a substrate and a plurality of recording layers;
- and
- an attachment layer which is provided between the two discs and includes ultraviolet curable resin,
- wherein thickness of each of the substrates in the two discs is equal to or greater than 0.3 mm and equal to or less than 0.545 mm,
- wherein transmittance of the two discs is equal to or less than 20%, and
- wherein inversion rates on both surface sides of the attachment layer are equal or substantially equal to each other, and are equal to or greater than 70%.
A manufacturing method of an optical recording medium comprising:
- irradiating, with ultraviolet light, an ultraviolet curable resin layer interposed between two discs from both sides of the two discs, each of which includes a substrate and a plurality of recording layers, and curing the ultraviolet curable resin such that inversion rates on both surface sides of the ultraviolet curable resin layer becomes equal or substantially equal to each other and become equal to or greater than 70%,
- wherein a thickness of each of the substrates in the two discs is equal to or greater than 0.3 mm and equal to or less than 0.545 mm, and
- wherein transmittance of the two discs is equal to or less than 20%.
Dependencies are inferred from the claim text.