Patent ID: 6550987
Filing Date: 2003-04-22
Classification: G03B,Y10T

Abstract:
A light shielding blade being comprised of a base piece cut from a film material made of a polyester, and having a major surface portion capable of shielding an incident light and an edge face portion capable of suppressing reflection of the incident light, said edge face portion having a porous surface layer structure,wherein said blade is formed by a process comprising the steps of: punching said film material to form said base piece with a major surface portion and a smooth edge face portion; and chemically etching said smooth edge face portion of the punched base piece so as to roughen the edge face portion by forming a plurality of pores in said smooth edge face portion, thereby suppressing a reflection of said incident light at the edge face portion, wherein said punching step is carried out after provisionally forming a coating on a surface of the film material, said coating having at least one of an electric charge preventing effect, a lubricating effect and a frosting effect and being provided with a resisting performance against chemical etching such that said etching step is performed only on said smooth edge face portion.