Multilayered optical information-recording media and process for manufacture thereof
US6973021B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2003 |
| Grant date | Dec 6, 2005 |
| Priority date | — |
| Expiry date | Oct 19, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/108
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention provides an optical disk effective in both precision and productivity, and to a process for the manufacture thereof. The optical disk allows reading of the information recorded on each information-recording surface of the two or more information-recording surfaces by varying the focal position of a playback laser beam incident on and passing through said light transmitting substrate; and the optical disk is provided with a transparent layer that is laminated onto the light transmitting substrate and is constituted of a thermoplastic resin sheet of uniform thickness and the transparent layer has an information-recording surface other than the surface of said light transmitting substrate formed thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.