Patent ID: 6800348
Filing Date: 2004-10-05
Classification: G11B,Y10T

Abstract:
An optical recording medium, comprising:recording tracks which comprise track lands positioned on a first side of the optical recording medium and formed along track grooves, the track grooves being one of concentric grooves and a spiral groove; wherein the Track lands are provided between the track grooves, information being recorded only on said track lands; and a recording area positioned on the first side of the optical recording medium and which has non-track groove regions where none of the track grooves are made, each non-track groove region having a pit recording region; wherein the recording area further includes an embossed pit pattern formed in the pit recording region and representing information about each of the recording tracks; wherein the recording area further includes a detection pattern provided in one of the non-track groove regions and configured to permit optical detection of movement of a light spot of a reading laser beam across one of the recording tracks, said embossed pit pattern and said detection pattern being formed at a distance of a half track pitch from an extension of one of said track grooves in a direction at right angles to said recording track; wherein the detection pattern has a different shape from said embossed pit pattern and comprises a track counting groove having a center that is aligned with a center of each of the track lands; wherein each track counting groove is recessed below each embossed pit pattern; and wherein a signal generated by applying said reading laser beam to said track grooves has a same polarity as a signal generated by applying said reading laser beam to said track counting grooves.