Optical memory disc
US4634617A · kind A · utility
26Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1984 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Aug 8, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/0035
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Concentric guide grooves are formed on a glass substrate, and recording medium is disposed on the glass substrate having the concentric grooves. A centering device is secured to the glass substrate in a manner that the center of the centering device is positioned at the center of the concentric guide grooves. In a preferred form, photopolymer is disposed between the centering device and the glass substrate as adhesive. The centering device is provided with an aperture through which ultraviolet rays are applyed to the photo-polymer to cure it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.