Optical disc having large display patterns and its manufacturing apparatus
US5748607A · kind A · utility
49Cited by
5References
8Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 19, 1995 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Dec 19, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk having both recording surfaces on which are formed pits trains. A recognizable display pattern is formed by a group of dummy pits formed on one of the recording surfaces. An apparatus for manufacturing the optical disk in which a light beam is modulated in accordance with a dummy forming signal obtained by selectively stopping a dummy pulse, and the modulated light beam is irradiated to a resist layer formed on a recording surface of a disk to form a group of dummy pits representing a display pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.