Optical disk
US6465071B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2000 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Aug 29, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/2595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an optical disk which achieves stable electrical characteristics and disk shape, and in which visible information is provided on the signal readout surface side of the disk. An optical disk is constructed by sequentially layering on the pits of a transparent disk substrate (1a), a recording layer (2a) of a translucent reflective film, an optical buffer layer (3a) formed from a light transmissive material, and a printed layer (4a) on which is printed visible information, with the visible information of the printed layer (4a) being visible from the disk substrate (1a) side of the disk. The optical buffer layer (3a) is formed at a thickness, measured in terms of optical distance (the product of multiplying the physical distance by the refractive index of the material from which the optical buffer layer is formed), of between 3 &mgr;m˜45 &mgr;m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.