Optical information recording medium
US6341122B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2000 |
| Grant date | Jan 22, 2002 |
| Priority date | — |
| Expiry date | Mar 15, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording disc such as CD-R or DVD-R is composed of a transparent disc substrate provided with a spiral pregroove, a recording dye layer, placed in the pregroove, and a light-reflecting layer, wherein the pregroove formed in the area between an inner circle having a radius corresponding a half of a radius of the disc substrate and an outer circle having a radius corresponding 19/20 of the radius of the disc substrate has a radiused top corner at least one side, under the condition that the radius of the radiused corner on the outer circle is more generous than the radius of the radiused corner on the inner circle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.