Unit and disc having a relatively rough surface and method of producing
US5031172A · kind A · utility
21Cited by
9References
27Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 28, 1988 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Dec 28, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/24306
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording disc comprising a resin layer of resin material formed on a relatively rough surface of each transparent disc substrates, the resin material having approximately the same refractive index of light as the refractive index of the transparent disc substrate, and a recording layer formed on each of said resin layers. Accordingly, the optical recording disc enables a decrease in production costs and to write and read an information signal into and from the recording layer at an improved signal to noise ratio as compared to a conventional optical recording disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.