Disc recording/reproducing apparatus and servo signal writing apparatus
US6583948B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 1999 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | Jun 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59677
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disc recording and/or reproducing apparatus has a scale movable along with a magnetic head radially of a magnetic disc provided in the disc recording and/reproducing apparatus and which has recorded thereon readable by a laser light position information indicative of the radially moving position of the magnetic head. The position information indicates a smaller range than the radial length of a signal recording area on the magnetic disc. The writing of servo signals to the magnetic disc is done by a servo signal writing apparatus including an optical head disposed movably in a position corresponding to the moving position of the scale to detect the position information recorded on the scale, and a main controller to move the magnetic head radially of the magnetic disc for writing the servo signal to the magnetic disc and to move the optical head correspondingly to a position where the servo signal is to be written. The position where the position information is to be detected is changed by moving the optical head correspondingly to the position where the servo signal is to be written, thereby recording a servo signal to each of all the areas on the magnetic disc. Thus, the disc r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.