Optical information recording medium
US5835479A · kind A · utility
9Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1996 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Oct 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1259
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A read-only zone or control zone is formed in an optical information recording medium wherein information signal are formed in both grooves and lands. Grooves are not formed in the control zone or read-only zone, and read-only data such as control data, audio-video data, or computer data is pre-recorded as a sequence of pre-formed pits on the track center line. The track pitch of the pre-formed pit sequences in the control zone or read-only zone is equal to the groove pitch in the read-write zones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.