Optical retrieval apparatus using a tellurium (IV) leuco dye
US5326677A · kind A · utility
2Cited by
6References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1993 |
| Grant date | Jul 5, 1994 |
| Priority date | — |
| Expiry date | Feb 19, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed an optical retrieval apparatus which uses a laser for illuminating an optical element. A sensor responds to modulated light from the optical element to produce electrical signals. The optical element has a substrate and on the surface of the substrate, a dye containing recording layer and a light reflecting layer. The improvement is that the dye is a leuco dye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.