Patent ID: 7088668
Filing Date: 2006-08-08
Classification: G11B

Abstract:
1. An optical recording medium for recording, reproducing, or erasing information by irradiation with a laser beam, comprising a disk-shaped transparent substrate and a recording layer formed on the substrate, wherein information tracks and addresses are provided on the substrate, the information tracks including groove tracks and land tracks that are arranged either in the form of a spiral or concentric circles, each of the addresses indicating a position on the recording medium and being composed of uneven strings of pits, the strings of pits are arranged so that center lines of the strings of pits are shifted in a radial direction of the recording medium at a distance of about one-half of a track pitch from center lines of the groove tracks and center lines of the land tracks, and a pit width W of the pits satisfies the relationship: with respect to a track pitch Tp of the recording medium.