Patent ID: 8427923

Claim:
An optical pickup device comprising: a laser light source; an objective lens which converges laser light emitted from the laser light source on a disc; an astigmatism element which imparts astigmatism to the laser light reflected on the disc to set a first focal line position to be defined by convergence of the laser light in a first direction, and a second focal line position to be defined by convergence of the laser light in a second direction perpendicular to the first direction away from each other in a propagating direction of the laser light; a spectral element which changes propagating directions of four light fluxes obtained by dividing a light flux of the laser light reflected on the disc by a first straight line and a second straight line respectively in parallel to the first direction and the second direction to disperse the four light fluxes from each other; a photodetector including a sensor group which receives the four light fluxes dispersed by the spectral element; and a memory which holds a correction value for suppressing a DC component in a tracking error signal resulting from a positional displacement of the spectral element with respect to an optical axis of the laser light.