Patent ID: 6714495
Filing Date: 2004-03-30
Classification: G11B

Abstract:
A pickup device for recording information on an information recording medium and/or reproducing information from the information recording medium, comprising:a light source for emitting a first laser beam and a second laser beam which irradiate an information recording medium during recording of information and/or during reproduction of information, the first laser beam irradiating a track of the information recording medium, and the second laser beam irradiating tracks adjacent to the track; a controller for independently controlling powers of the first and second laser beams; and a grating positioned between said light source and said information recording medium, wherein said light source has a structure so as to emit the first and second laser beams whose polarized states are different from each other, and said grating has a structure so as to allow a predetermined linearly polarized component of an incoming beam to be transmitted therethrough without being diffracted.