Optical disc and fabrication method thereof
US6938267B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2002 |
| Grant date | Aug 30, 2005 |
| Priority date | — |
| Expiry date | Jun 26, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/25715
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
On a replica substrate 1a, a reflection layer 11, a first dielectric layer 12 made of ZnS—SiO2, a recording layer 13 made of a phase change type recording material, and a second dielectric layer 14 made of ZnS—SiO2 are successively formed. In addition, a reaction protection layer 15 made of Si3N4 or SiO2 is formed on the second dielectric layer 14. As a result, an information signal portion 1c is composed. A light transmissivity sheet is formed through an adhesive layer so that the light transmissivity sheet coats an information signal portion 1c. As a result, a light transmission layer is composed. When the reaction protection layer 15 is not formed, a reaction protection resin layer made of an ultraviolet ray setting resin is formed so that the reaction protection resin layer coats the information signal portion 1c.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.