Preformatted optical recording card and method of producing the same
US4877713A · kind A · utility
9Cited by
13References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1987 |
| Grant date | Oct 31, 1989 |
| Priority date | — |
| Expiry date | Jan 16, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24868
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved art of producing an optical recording medium by utilizing a photo-etching technique is disclosed. Pits pattern of address for guide groove and sector on each of tracks of optical recording medium to be preformatted is formed in accordance with a photo-etching process or a resist lift-off process. A film of optical recording medium is formed on a transparent base plate and it is then subjected to photo-etching process or alternatively to resist lift-off process to form preformatted pits pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.