Optical recording medium and method for manufacturing the same
AssigneeSony Corporation
InventorsMINORU KIKUCHI, AKIO KOSHITA
Life of this patent
Estimating the term…
Abstract
An optical recording medium includes a first disk, a second disk, and an adhesive layer for bonding the first disk to the second disk. The first disk and the second disk each include a substrate having a first surface and a second surface and having a gradient on an outer peripheral portion of the second surface, two or more information signal layers disposed on the first surface, an intermediate layer disposed between adjacent information signal layers, and a cover layer covering the two or more information signal layers and the intermediate layer. The second surface of the substrate included in the first disk faces the second surface of the substrate included in the second disk with the adhesive interposed therebetween.
Claims7
An optical recording medium comprising:
- a first disk;
- a second disk;
- and
- an adhesive layer for bonding the first disk to the second disk, wherein
- the first disk and the second disk each include:
- a substrate having a first surface and a second surface and having a gradient on an outer peripheral portion of the second surface;
- two or more information signal layers disposed on the first surface;
- an intermediate layer disposed between adjacent ones of the information signal layers;
- and
- a cover layer covering the two or more information signal layers and the intermediate layer, and
- the second surface of the substrate included in the first disk faces the second surface of the substrate included in the second disk with the adhesive layer interposed therebetween.
A method for manufacturing an optical recording medium, the method comprising:
- sandwiching an adhesive between a first disk and a second disk;
- and
- rotating the first disk and the second disk to stretch the adhesive, wherein
- the first disk and the second disk each include:
- a substrate having a first surface and a second surface and having a gradient on an outer peripheral portion of the second surface;
- two or more information signal layers disposed on the first surface;
- an intermediate layer disposed between adjacent ones of the information signal layers;
- and
- a cover layer covering the two or more information signal layers and the intermediate layer, and
- the second surface of the substrate included in the first disk faces the second surface of the substrate included in the second disk with the adhesive interposed therebetween.
Dependencies are inferred from the claim text.