Patent ID: 8052414

Claim:
A mold structure used to produce a discrete track medium, comprising in a surface of the mold structure: a plurality of line pattern forming concave portions which are positioned so as to be adjacent and substantially parallel to each other; and a communicating concave portion which is positioned so as to intersect the line pattern forming concave portions and connects the line pattern forming concave portions, wherein X/Y is 1×10 5 or less and Z/Y is 5 or less, where X denotes the length of a line pattern forming concave portion with respect to a line direction from an end of the line pattern forming concave portion to an end of the communicating concave portion, the latter end being situated on the same side where the former end is situated, Y denotes the width of the line pattern forming concave portion, and Z denotes the depth of the line pattern forming concave portion.