Patent ID: 6798734
Filing Date: 2004-09-28
Classification: G11B

Abstract:
An optical recording medium having a header region in which at least a signal for address reproduction is recorded by an unevenness pattern on a substrate,wherein, in said header region, an unevenness pattern corresponding to a reproducing signal in seeking reproduced when an optical head moves between tracks in recording/reproduction of said optical recording medium is comprised of concave portions constituting the reproducing signal in seeking, wherein said concave portions in positions equivalent to each other between two or more adjacent tracks are connected to each other in a direction orthogonal to the tracks, and wherein a continuous portion formed by a series of edges of the connected concave portions, which series of edges is in a direction crossing the tracks, is formed in an arc shape along a locus of the moving optical head as a whole, and the degree of swelling thereof is not more than one third of the minimum recording unit.