Printing intaglio, printing intaglio manufacturing method, print-making method, and print
AssigneeSharp Kabushiki Kaisha
InventorsNobuaki Yamada, Kenichiro Nakamatsu, Hidekazu Hayashi
Life of this patent
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Abstract
A printing intaglio (100A), (100B) is a printing intaglio for use in intaglio printing, the printing intaglio having a surface which has a plurality of first recessed portions (12) that form a pattern to be printed, wherein at least one of the plurality of first recessed portions has a plurality of minute recessed portions (16p) inside the first recessed portion, and when viewed in a direction normal to the surface of the printing intaglio, a two-dimensional size of the plurality of minute recessed portions is not less than 10 nm and less than 500 nm.
Claims15
A printing intaglio for use in intaglio printing,
- the printing intaglio having a surface which has a plurality of first recessed portions that form a pattern to be printed,
- wherein at least one of the plurality of first recessed portions has a plurality of minute recessed portions inside the first recessed portion, and
- when viewed in a direction normal to the surface of the printing intaglio, a two-dimensional size of the plurality of minute recessed portions is equal to or more than 10 nm and less than 500 nm.
A method for manufacturing a printing intaglio, comprising the steps of:
- (a) providing a printing base which has a plurality of first recessed portions at its surface;
- (b) forming an aluminum film on the printing base;
- (c) after (b), anodizing a surface of the aluminum film, thereby forming a porous alumina layer which has a plurality of minute recessed portions;
- (d) after (c), bringing the porous alumina layer into contact with an etching solution, thereby enlarging the plurality of minute recessed portions of the porous alumina layer;
- and
- (e) removing part of the aluminum film formed outside the plurality of first recessed portions.
Dependencies are inferred from the claim text.