Volumetric track definition for data storage media used to record data by selective alteration of a format hologram
US6322933A · kind A · utility
45Cited by
85References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1999 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Jan 12, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A photoactive medium has a complex format grating written thereon, the complex format grating including at least three component gratings, each of the component gratings characterized by a unique grating vector. Methods for writing the complex format grating include the steps of providing a photoactive medium; and focussing a plurality of pairs of mutually coherent light beams into a focal plane in the medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.