Apparatus and method for recording an information on a recordable optical record carrier using oval spot profile
US7397734B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2003 |
| Grant date | Jul 8, 2008 |
| Priority date | — |
| Expiry date | Aug 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1398
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and a corresponding apparatus for recording an information on a recordable optical record carrier (2) by irradiation of a light beam through an optical system (3-7) onto said record carrier (2) for forming marks and lands representing said information along an information recording direction (t), obtains a higher recording density, and thus higher data capacity, by using astigmatism for influencing the light beam from the light source (8) to the record carrier (2) during recording of information so as to obtain a light beam having a substantially oval spot profile having a shorter axis in the information recording direction (t), i.e., the tangential direction for an optical disc, compared to the direction (r) orthogonal thereto, i.e., the radial direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.