Method and apparatus for bistable optical information storage for erasable optical disks
US4965784A · kind A · utility
52Cited by
16References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 31, 1988 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | May 31, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B13/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and an optical device for bistable storage of optical information, together with reading and erasure of the optical information, using a photoactivated shift in a field dependent phase transition between a metastable or a bias-stabilized ferroelectric (FE) phase and a stable antiferroelectric (AFE) phase in an lead lanthanum zirconate titanate (PLZT). An optical disk contains the PLZT. Writing and erasing of optical information can be accomplished by a light beam normal to the disk. Reading of optical information can be accomplished by a light beam at an incidence angle of 15 to 60 degrees to the normal of the disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.