Birefringent azo dye polymer erasable optical storage medium
US5384221A · kind A · utility
39Cited by
15References
19Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 21, 1993 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Apr 21, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical storage medium including a transparent polymer and an isomerizable AZO dye, the optical storage medium being coated as a water miscible solution on a substrate so as to form a film having a thickness of from .mu.m to 100 .mu.m storing information through birefringence and having a diffraction efficiency greater than 40% at a 1 millisecond response time. The isomerizable AZO dye remains in the film and is present in a concentration of from 4.5% to 25% based on the weight of the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.