Apparatus for recording a wobbling, spiral guide groove on an optical disc
US4942565A · kind A · utility
38Cited by
16References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1989 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Jul 28, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/3036
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Recording apparatus for forming a track on a disk-shaped recording medium capable of optical information reproduction, comprises a deflection device for deviating a recording beam from a light source in a radial direction of the disk-shape recording medium and a deflection-control signal generating device. The deflection control signal is developed from the superimposition of a first signal having a predetermined frequency and a second signal having a lower frequency than the predetermined frequency. The superimposition of the second signal can be done while retaining the predetermined frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.