Patent ID: 8630154
Filing Date: 2014-01-14
Classification: G11B

Abstract:
1. Apparatus comprising a pickup for reading data from a super-resolution optical disc, the pickup comprising a laser for generating a main beam and a first and a second satellite beam, the two satellite beams having each a radial offset with regard to the main beam, the two satellite beams and the main beam being focused by an objective lens onto the optical disc and the reflected light from the optical disc being guided onto two detector units for providing a HF data signal, wherein the pickup generates a third satellite beam following the first satellite beam, having the same radial offset as the first satellite beam, a fourth satellite beam following the second satellite beam, having the same radial offset as the second satellite beam, for providing a crosstalk correction of the HF data signal; the two detector units include a first detector unit being sensitive for the main beam and the first and second satellite beams, but not for the third and fourth satellite beams, and a second detector unit being sensitive for the third and fourth satellite beams, but not for the main beam and the first and second satellite beams; and the pickup comprises a diffractive grating for generating in addition two beams from a beam generated by the laser, a beam splitting element for splitting each of the three beams generated by the diffractive grating into two beams having orthogonal polarization states, a non-polarizing beam splitter directing reflected signals from the optical disc to a polarizing beam splitter, which is arranged for directing reflected light of the main beam and the first and second satellite beams to the first detector unit and for directing reflected light of the third and fourth satellite beams to the second detector unit.