Storage media for an optical information system having an identification code embedded therein
US5430281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1994 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Feb 28, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A optical storage disc for use in an optical storage system includes a storage layer which is capable of being disrupted when a laser beam of sufficient intensity is focused thereon. The optical storage disc has a transparent substrate layer on one side of the storage layer and a lacquer layer on the other side of the storage layer. The disruptions provided by the laser beam are selected to provide human readable and/or machine readable patterns. To reduce the damage to portions of the optical disc other than the storage layer, the storage layer is exposed to the laser beam prior to curing, or prior to applying and curing the lacquer layer. The optical disc can be of the type with data written thereon during fabrication, or the disc can be of the type in which data can be impressed thereon after fabrication of the optical disc. The patterns on the optical disc can be in the form of optical bar codes. In one application of the present invention involving the type of disc on which data can be written after fabrication, the pattern resulting from application of the laser beam to the disc is read by an optical reading device and transferred to the disc in the data format.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.