Optical disk having recording capacity of about at least 15 GB
US6512735B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2001 |
| Grant date | Jan 28, 2003 |
| Priority date | — |
| Expiry date | Apr 2, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/263
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk having a recording capacity of about at least 15 GB and methods of making the same. The optical disk may include an optical disk substrate having successive pits formed into a first surface. The successive pits may correspond to a recording signal. The optical disk may further have a reflection film formed on the first surface of the optical disk substrate and in the successive pits and have a light transmissive layer formed on the reflection film. If a length of an effective pit length B of each pit of the plurality of successive pits is restricted to be not less than 80 nm and not greater than 250 nm, then a thickness T of the reflection film is restricted to be not greater than 20 nm and not less than 8 nm, and the thickness of the light transmissive layer is restricted to be not greater than 177 &mgr;m and not less than 10 &mgr;m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.