APPARATUS COMPRISING PICKUP PROVIDING THREE BEAMS FOR READING DATA FROM OR WRITING DATA TO OPTICAL STORAGE MEDIUM, AND CORRESPONDING OPTICAL STORAGE MEDIA

PROBLEM TO BE SOLVED: To establish a system for an advanced data storage use, specifically, when a pickup unit having a blue laser diode is used.

SOLUTION: The apparatus comprises the pickup unit with a laser, a detector unit and an objective lens for reading data from or writing data to a Super-RENS (super-resolution near-field structure) optical storage medium having a track pitch (TP) below the optical resolution limit, the pickup unit generates a main beam (M) for reading and/or writing of data and generates two satellite beams (S1, S2) for providing a tracking error signal, the three beams are focused by the objective lens onto the optical storage medium, and the reflected light from the optical storage medium is 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.

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