Optical disk device and optical disk for recording and reproducing high-density signals
US6343062B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1998 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Sep 11, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10597
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk device comprising a converging optical system in which a laser beam is irradiated onto an optical disk having a recording thin film on a substrate provided with uneven guide grooves and a tracking controller that controls tracking so that the laser beam converged by the converging optical system scans a convex part or a concave part of the guide groove, wherein the tracking controller controls tracking polarity so that the tracking polarity is inverted according to the depth of the guide groove. As a result, in optical disks having any groove depth, a laser beam can scan a target groove track or a target land groove track correctly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.