Method and apparatus for maintaining a recording light beam in an on-track position on a recording medium
US5440534A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 1994 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Jan 10, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for, in an optical data recorder, maintaining a recording light beam in an on-track position on a recording medium. In the apparatus an optical head has a tracking arrangement movable in a direction parallel to the recording medium for changing the tracking position of the recording light beam on the recording medium. The method comprises the steps of: i)detecting light reflected from the optical recording medium and producing a corresponding tracking error signal; ii) generating a mark formation effectiveness signal for each of a plurality of trial tracking positions, each mark formation effectiveness signal being associated with a given value of the tracking error signal; iii) determining the mark formation effectiveness signal corresponding to an on-track position and determining an on-track the value of the associated tracking error signal; and iv)during data recording periods, in response to the tracking error signal, adjusting the position of the movable tracking means so that the on-track value of the tracking error signal is maintained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.