Method for manufacture of molding die for Fresnel lens sheet

A method for the manufacture of a molding die suitable for the manufacture of a Fresnel lens sheet having arranged thereon a multiplicity of sawtooth-like Fresnel lenses composed of a Fresnel lens surface demonstrating a convex lens function and a rise surface located between the adjacent Fresnel lens surfaces, this sheet having a light-diffusing layer with a convexo-concave structure on said rise surfaces, the method comprising a step of forming a layer containing fine particles on the rise surfaces by:

• coating a photoresist containing fine particles on the surface of a Fresnel lens original mold having Fresnel lens surfaces and rise surfaces or on the surface of a transfer mold of said Fresnel lens original mold;
• and
• illuminating with light so as to obtain mutually different light exposure doses per unit surface area on the Fresnel lens surfaces and rise surfaces.