Method of producing a molding die for an information recording m

Details Method of producing a molding die for an information recording m Method of producing a molding die for an information recording m

1992-12-21

1995-02-14

Woo, Jay H.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156628, 1566591, 156646, 264 25, 264107, 264220, 425810, B44C 122, B29D 1700

Patent

active

053893131

ABSTRACT:
A method produces a molding die for an information recording medium, having a mold surface with a prescribed unevenness pattern comprising a projection; the projection having different etching velocities along its projected thickness; and defining a pair of convergent opposite inclining side slopes. Each slope of the pair forms an acute inclining angle with respect to extension of the mold surface. A pattern-forming layer is formed comprising a common metal element throughout its thickness and an additional element differing in composition from the common metal element in the thickness direction of the pattern-forming layer. The common metal element and the additional elements have different etching velocities in the thickness direction of the pattern-forming layer. The pattern-forming layer is selectively etched with a common etchant to form the projection.

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