Optical data storage media with spatially variable energy absorptivity
US4852077A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1988 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Feb 5, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Optical data storage media of various technologies, including those with multiple layers of varying absorptivities of light as well as those which are grooved to facilitate tracking, are improved by combining the absorptivity differences with height variations in the interface between the layers (and thereby the relative thicknesses of the layers). The result is a means of varying in a spatial manner in the media themselves the rate at which such media absorb energy. This offers a variety of benefits in both recordation and reading, including helping to focus the heat generated by incident recording beams, increasing tracking sensitivity for both recordation and reading, and preformatting the media as a guide for both recordation and reading.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.