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AssigneePioneer Corporation
InventorsMitsuru Sato, Junichi Furukawa, Kazuo Takahashi, Takanori Maeda, Hiroshi Nishiwaki, Takayuki Nomoto, Ikuya Kikuchi
Estimating the term…
A tracking servo apparatus in which reflection light obtained when a laser beam is irradiated onto a recording surface of an optical disc is photoelectrically converted, thereby obtaining a photoelectric conversion signal, a tracking error signal showing a deviation amount of an irradiating position of said laser beam for a track in a disc radial direction on the recording surface is generated by the photoelectric conversion signal, a spherical aberration occurring in an optical system is detected, a level of the tracking error signal is corrected on the basis of the detection result, and the irradiating position of the laser beam is moved in the disc radial direction in accordance with the level-corrected tracking error signal.
A tracking servo apparatus of an optical information recording and reproducing apparatus for recording and reproducing information by irradiating a laser beam onto an optical disc, comprising:
Dependencies are inferred from the claim text.