Patent ID: 8034277

Claim:
A method for transferring a pattern of minute structures from a transfer mold mounted on one of two press members located opposingly for movements toward and away from each other and provided with a center hole defining three small-diameter segments and three large-diameter segments alternately along an inner periphery of said transfer mold, to a curable resin layer coated on an annular substrate plate mounted on the other press member and having an inside diameter exactly matching with small-diameter segments at the inner periphery of said mold, imprinting said pattern of minute structures on said resin layer by pressing same against said mold, characterized in that said method comprises the steps of: moving one pressing member toward the other to position said mold and said substrate plate in close proximity to each other; driving radially displaceable chuck pawls provided in at least three uniformly spaced positions around an inner periphery of said substrate plate to grip simultaneously both of said substrate plate and said small-diameter segments at the inner periphery of said mold thereby bringing centers of said substrate plate and said mold into alignment with each other; disengaging said chuck pawls from the inner periphery of said substrate plate and pressing said press members to each other to imprint profiles of a transfer surface of said mold on said resin layer; hardening said resin layer being still held in engagement with said mold; and driving said chuck pawls to grip said substrate plate at spaced positions from said large-diameter segments at the inner periphery of said mold and moving said press members away from each other to separate said substrate plate from said mold.