Data carrier for optical read-out
US4020278A · kind A · utility
32Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 16, 1975 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Oct 16, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to data carriers intended for optical read out. The data carrier in accordance with the invention comprises: a first transparent material at the surface of which the information is recorded in the form of an embossed pattern; a partially transparent metal layer covers said embossed pattern and a second, thick transparent material is deposited upon the metal layer for protection purposes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.