Invention Grant
US08427923B2 Optical pickup device, optical disc device and focus adjusting method 失效
光拾取装置,光盘装置和聚焦调整方法

Optical pickup device, optical disc device and focus adjusting method
Abstract:
An optical pickup device includes an astigmatism element which imparts astigmatism to laser light reflected on a disc, 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 to disperse the four light fluxes from each other, and a photodetector having a sensor group which receives the four light fluxes. The optical pickup device is further provided with 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. The tracking error signal is corrected by the correction value to thereby suppress the DC component.
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