To read out the data from the optical memory media, or the device which has the pickup which supplies three beams in order to write the data to the same media, and from the super RENS optical memory

摘要

The apparatus comprises a pickup with a laser, a detector unit and an objective lens for reading data from or writing data to a Super-RENS optical storage medium having a track pitch (TP) below the optical resolution limit, the pickup generating a main beam (M) for reading and/or writing of data and generating two satellite beams (S1, S2) for providing a tracking error signal, the three beams being focused by the objective lens onto the optical storage medium, and the reflected light from the optical storage medium being guided onto the detector unit. The main beam and the two satellite beams have a light intensity on the optical storage medium being sufficient for providing a super-resolution effect for the main beam as well as for each satellite beam. The light intensity of the two satellite beams is for example each in the order of 70 to 100% of the intensity of the main beam, if the apparatus is used for reading of data. The detector unit comprises in particular a main detector for detecting reflected light from the main beam, and two satellite detectors for detecting reflected light from the satellite beams reflected from the optical storage medium, and wherein the detector unit provides 3-beam tracking error signal for a tracking regulation.