Information recording medium and manufacturing method thereof
US6982110B2 · kind B2 · utility
1Cited by
11References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 2002 |
| Grant date | Jan 3, 2006 |
| Priority date | — |
| Expiry date | Dec 11, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information recording medium includes a transparent substrate and a recording layer or a metal layer provided on the transparent substrate directly or via a ground layer. The information recording medium has a RAM area on which information is recorded, reproduced or erased, and a ROM area from which only reproduction is made, and an average thickness of the recording layer of said RAM area is larger than that of the recording layer or metal layer of the ROM area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.