| 摘要 |
An optical disk device performs tracking on a recordable optical disk which has an information recording track and a guiding track for guiding an optical beam to the information recording track, the guiding track having pre-pits including address information recorded therein. This device includes a photodetector which is divided into two divisions by a dividing line which is approximately optically parallel to the tangential line of the information recording track of the optical disk, and receives reflected light of the optical beam which is incident on the information recording track, and a tracking-error-signal generating portion having the respective outputs of the two divisions of the photodetector input thereto and generating a tracking error signal which is used for performing the tracking on the optical disk. The tracking-error-signal generating portion includes first and second holding portions holding local maximum values of the outputs of the two divisions of the photodetector, respectively, and a pre-pit-signal subtracting portion obtaining the differential signal of respective outputs of the first and second holding portions.
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