Thomson Licensing

Heinz-Jörg Schröder

Christian Büchler

Lieu-Kim Dang

Stefan Kimmelmann

The track jumping of a scanner on optical storage media in which information items are stored on groove and land tracks or which have not yet been written to is intended to be made possible in a reliable manner. For this purpose, firstly a fictitious track type is defined for a regulating circuit, which regulates the position of the scanner. The regulating circuit is then closed on the basis of the track type defined and a track scanning signal. The reaction of the scanner to the closing is detected in order to obtain from this an item of information about the track type. This method is also advantageous, in principle, for closing the track following regulation in information carriers having relatively high storage densities.

Method and apparatus for track type identification, and method of track jump

A device for reading from and/or writing to optical recording mediaon which information is present in the form of pits, with a linearly polarized light beam A device for reading from and/or writing to optical recording mediawhich ensures correct reproduction of the stored data even when the recording medium influences the polarization of the light beam. This is achieved by virtue of the fact that a device for reading from and/or writing to optical recording mediawith a light beamwhich is linearly polarized in a first direction of polarization has a beam-splitting elementfor splitting the light beaminto partial beamsin accordance with the first and a second direction of polarization, perpendicular to the first direction of polarization, and that it has a partly reflecting elementwhich directs both the partial beamof the first direction of polarization and the partial beamof the second direction of polarization onto a detector unitwhich has separate detector elementsfor the partial beamsof the two directions of polarization.

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Le Chevalon de Voreppe, France

Heinz-Jörg Schröder