Optical reproducing method
US6549497B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2002 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Feb 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical reproducing method for an optical medium including a disk-like substrate having a groove structure along tracks divided into a plurality of units. Each of the units includes a dropout portion of the groove structure along the track which is a non-groove portion. The groove structure is wobbled in a fixed cycle in a radial direction. When the wobble is formed in the circumferential direction of the track, the dropout portion is formed so that a phase of the wobble is continued with a phase of the wobble of the groove structure within another unit adjacent to the dropout portion. The method includes irradiating an optical spot on the optical medium, detecting a reflected beam from the optical medium, and reproducing information on the optical medium by using a signal obtained by the reflected beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.