MOLD PART AND MOLDED FLAT-PLATE PRODUCT

摘要

A mold part capable of efficiently molding a molded flat-plate product with excellent optical performance. In the mold part, irregular surface structures with a maximum centerline average roughness Ra (max1) of 3.0 to 1000 µm are formed on a cavity surface for forming the surface of the molded flat-plate product. Each irregular surface structure has a groove or ridge structure unit with two or more flat surfaces. Grooves and ridges are formed on each flat surface of the structure unit. On each flat surface with the grooves and ridges, the maximum centerline average roughness Ra (max2) has the relation of 0.5 > Ra (max2)/Ra (max1) > 0.002 relative to Ra (max1) and has the relation of Ra (max2)/Ra (min2) > 1.5 relative to the minimum centerline average roughness Ra (min2).