Patent ID: 8278029

Claim:
A stamper production method comprising: a first stamper forming step of producing, by electroplating processing using a matrix in which a pit string comprising at least a first concave pit and a second concave pit is formed on an inorganic resist layer based on recording information, a first set of stampers, each stamper of the first set of stampers having a first convex pit corresponding to the first concave pit and a second convex pit corresponding to the second concave pit, wherein the second convex pit is longer than the first convex pit; a second stamper forming step, performed after the first stamper forming step, of producing, by electroplating processing using the matrix, a second set of stampers, each stamper of the second set of stampers having a first convex pit corresponding to the first concave pit and a second convex pit corresponding to the second concave pit, wherein the second convex pit is longer than the first convex pit; an etching step of carrying out etching processing on the second set of stampers so that a first pit height of the first convex pit of each stamper of the second set of stampers is reduced more than a second pit height of the second convex pit of each stamper of the second set of stampers, wherein the first set of stampers are not subjected to etching processing.