Patent ID: 8064310

Claim:
An optical disk recording device that detects a shift of the recording position with respect to an optical disk, comprising: a pre-pit distribution detecting circuit that detects the distribution of pre-pits for a plurality of wobbles based on binarized pre-pit signals obtained by binarizing pre-pit signals corresponding to pre-pits on said optical disk and a wobble counter value obtained by counting said binarized pre-pit signals in synchronization with a locked wobble, which is a wobble signal having a period corresponding to a wobble on said optical disk and fixed in phase; a wobble slip determining circuit that compares the distribution of said pre-pits detected by said pre-pit distribution detecting circuit and a reference pre-pit distribution corresponding to a desired recording position, thereby determining the shift amount of the recording position with respect to said desired recording position for each wobble; and an in-wobble recording position shift detecting circuit that holds, in synchronization with said binarized pre-pit signals, a counter value associated with the phase of said wobble obtained by dividing the frequency of a recording clock and counting frequency-divided recording clocks, and detects the shift amount of said recording position based on said held counter value.