Patent ID: 7541564
Filing Date: 2009-06-02
Classification: G02B,G11B

Abstract:
1. Optical pickup for optical recording media having two or more data tracks, comprising: a light source for emitting a light beam for reading from and/or writing to an optical recording medium, and an electrically controlled diffraction grating, which is switchable between at least two states for generating one or more light beams from the light beam emitted by the light source for reading from and/or writing to one or more of the data tracks, wherein in a first state one data track only is addressed for reading from and/or writing to, whereas in a second state two or more data tracks at a time are addressed for reading from and/or writing to, and wherein one or more of the generated light beams are used for addressing at least one of two or more data tracks arranged in a single groove or land of the optical record in medium, and a 0th order light beam is used for tracking and/or focus control based on the single groove or land.