Optical recording elements
US5236755A · kind A · utility
29Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Jul 26, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording element has a recording layer (18) protected by an overcoat layer (20) which is transmissive to laser radiation used for writing pits in the recording layer (18). The thickness of the overcoat layer (20) is selected to be less that the conventional 1/2 wavelength thickness and the recording layer thickness is selected, in conjunction with the overcoat layer thickness in such a way that the minimum value of reflectivity on the reflectivity-v-thickness curve is depressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.