Optical disk information recording/reproducing apparatus and method with laser-beam focus control
US7050365B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 2003 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Dec 8, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk apparatus is constructed for writing or reading information by irradiating a laser beam onto an optical disk while rotating the optical disk under a focus control of the laser beam relative to the rotated optical disk. In the optical disk apparatus, an irradiating section is operated to irradiate a laser beam onto the optical disk. A determining section determines a process pattern of the focus control by operating the irradiating section to irradiate the laser beam onto a predetermined area of the optical disk and by monitoring the laser beam reflected back from the predetermined area. A focusing section performs the focus control to regulate a spot diameter of the laser beam based on the determined process pattern during either of the writing or reading of information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.