Multi-level optical recording medium reproducing method and reproducing device
US7102969B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2002 |
| Grant date | Sep 5, 2006 |
| Priority date | — |
| Expiry date | Oct 22, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24088
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A reproduction method for a multi-level optical recording medium according to the present invention rotates an optical recording medium, on which recording data has been recorded according to a multi-level recording method which sets several levels for light reflectivity of virtual recording cells, emits a reproduction laser beam towards the optical recording medium, and reproduces the recording data based on an electric signal generated in accordance with a received level of reflected light, the method setting the emission power of the reproduction laser beam in a range of 1.0 mW to 2.5 mW inclusive when the optical recording medium is rotated at a linear velocity in a range of 9 m/s to 25 m/s inclusive. By doing so, it is possible to improve the read accuracy for recording data while suppressing the reproduction deterioration of the optical recording medium to a level where deterioration effectively does not occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.