Patent ID: 7938978

Claim:
A method of manufacturing a stamper, comprising: forming a first conductive layer on a master plate comprising lands and grooves; forming a first electroforming layer on the first conductive layer, peeling off the first conductive layer and the first electroforming layer from the master plate in order to form a first stamper to which the lands and grooves of the master plate are transferred; forming a first releasing layer on the first stamper; forming a second conductive layer on the first releasing layer, forming a second electroforming layer on the second conductive layer, peeling off the second conductive layer and the second electroforming layer from the first stamper in order to form a second stamper to which the lands and grooves of the first stamper are transferred; forming a lamination film on the second stamper, the lamination film being configured to reduce a width of grooves and comprising a larger thickness on upper surfaces of the lands than on bottom surfaces of the grooves; forming a second releasing layer on the lamination film; forming a transfer layer on the second releasing layer, forming a third electroforming layer on the transfer layer, peeling off the transfer layer and the third electroforming layer from the second stamper in order to form a third stamper to which the lands and grooves of the second stamper are transferred, and isotropically etching the transfer layer on the third stamper in order to reduce a width of lands of the third stamper, wherein the following relations are satisfied: 10 nm ≦EL T and E T ≦TL T , where a width of the groove of the second stamper is G w , a thickness of the lamination layer is LL T , a thickness of the transfer layer is TL T , a thickness of the third electroforming layer is EL T , an etching thickness of the transfer layer is E T and a width of the land of the third stamper is L W .