Optical information recording medium having first and second pit rows of identical reflectance
US9978415B2 · kind B2 · utility
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Key dates
| Filing date | Aug 16, 2017 |
| Grant date | May 22, 2018 |
| Priority date | — |
| Expiry date | Aug 16, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0133
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit (P1max) or a longest space (S1max) in a first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit (P2max) or a longest space (S2max) in the second pit row is defined as a second reflectance, the first pit row is formed such that the first reflectance becomes substantially identical with the second reflectance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.