Reflective optical data storage and laser recording media having grooved dielectric encoded prerecorded information
US4385372A · kind A · utility
34Cited by
7References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 1, 1981 |
| Grant date | May 24, 1983 |
| Priority date | — |
| Expiry date | May 1, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical data storage and recording material in which a reflective major surface layer is coated with an optically clear dielectric material having grooves therein. The dielectric material is itself transparent and data may be recorded by grooves created in the dielectric material. The grooves may have one depth primarily for destructive interference of light and another depth for interference and light scattering, thereby permitting two levels of encoding for prerecorded information, as well as user data formed by laser generated pits in the reflective major surface layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.