Patent ID: 7403468
Filing Date: 2008-07-22
Classification: B82Y,G11B

Abstract:
1. A recording medium used for an information recording or reading apparatus, comprising: a rectangular information recording area on a surface of said recording medium to record therein information; and position information, which is formed in said information recording area, for recognizing a position in said information recording area, said position information including: at least two first line segments, which are parallel to each other, formed by physical features which are different from those of other parts of said information recording area; and at least one second line segment formed by physical features which are different from those of other parts of said information recording area, the first line segments and the second line segment being disposed such that at least one of the first line segments or an extension line of at least one of the first line segments crosses the second line segment or an extension line of the second line segment, wherein neither the first line segments nor the second line segment is parallel to either of two edges, which are adjacent to each other, of said information recording area.