JPS57102321A - Fabrication of mold for producing lenticular lens - Google Patents

Abstract

PURPOSE: To mass-produce the mold easily by a method wherein a corrosion- resistant resist layer consisting of a group of lines is formed on a metallic substrate and the substrate is etched.

CONSTITUTION: A pattern consisting of a group of lines of the resist layer 2 is formed on the metallic substrate 1 such as stainless steel, copper or the like, the resist layer 2 being made of a material which is resistant to the corrosive action of ordinary etching liquids. Then, the metallic substrate 1 is etched by an etching liquid. In the early stage of the etching process, the substrate 1 is etched only at the parts where the resist layer 2 is absent, and recesses are produced. As the etching process proceeds, a side etching takes place wherein the substrate 1 is etched gradually from the parts at the gaps between the lines of the resist layer 2 toward the parts beneath the resist layer 2. The etching further proceeds so that the cross section of the etched part becomes substantially semi-circular in shape. After the etching of the substrate 1 is completed, the resist layer 2 is removed. When required, the substrate 1 may be etched again.

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