Mastering machine having non-repetitive runout compensation
US5825730A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Mar 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0953
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A mastering machine comprises a turntable being capable of holding a master disk, a detector disposed in noncontact with the turntable for detecting repetitive runout amount of the turntable in the radial direction thereof, a non-repetitive runout amount calculator for calculating a non-repetitive runout amount in the radial direction of the turntable on the output of the detector, a projector for projecting an exposure beam to the master disk held by the turntable and a compensation unit for adjusting the position of the exposure beam projected to the master disk on the basis of a signal from the non-repetitive runout amount calculator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.