Information storage stamper and method of manufacturing disks using the same
US4953385A · kind A · utility
22Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Aug 22, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/81
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
On a cemented carbide alloy disk or a cermet disk having been coated with either an iridium (Ir) alloy film or a ruthenium (Ru) alloy film is formed guide grooves by photography or ECR ion etching. The disk thus obtained is used as an optical or magnetic disk stamper. Next, a glass or aluminium disk is placed between a pair of stampers obtained as above and molded under pressure while heating thereby to make guide grooves of an optical or magnetic disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.