Patent ID: 6937542
Filing Date: 2005-08-30
Classification: G11B

Abstract:
1. A method of recording an optical disk having a wobbled track, comprising: projecting a recording light beam onto the wobbled track of the optical disk to form pits of predetermined lengths in the wobbled track of the optical disk; receiving reflected light of the recording light beam from pit-formed and non-pit-formed portions of the wobbled track of the optical disk, during recording, by a photodetector having a plurality of light receiving surfaces segmented in a radial direction of the optical disk, to output a composite reflected light detection signal; sampling and holding the reflected light detection signal; and performing tracking servo control based on a light amount distribution, in the radial direction of the optical disk, of the reflected light detection signal sampled and held by said sampling and holding, and detecting a wobble signal of the wobbled track based on a light amount distribution in the radial direction of the optical disk of the reflected light detection signal, wherein timing for said sampling and holding to sample and hold the reflected light detection signal for the tracking servo control is delayed behind timing for said sampling and holding to sample and hold the reflected light detection signal for detection of the wobble signal, wherein a sample-and-hold time period of the reflected light detection signal for the tracking servo control is set to be shorter than a sample time period of the reflected light detection signal for detection of the wobble signal of the wobbled track, and wherein lengths, along a longitudinal direction of a track, of the pits formed in the wobbled track of the optical disk are set to be within a 3T-11T range and wherein a delay time of the timing to sample and hold the reflected light detection signal for the tracking servo control is set to be within a 4T-5T range and a delay time of the timing to sample the reflected light detection signal for detection of the wobble signal of the wobbled track is set to be within a 0-2T range.