STRUCTURAL PARTS FOR OPTICAL APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide structural parts for an optical apparatus with which low reflectivity can be maintained even in a wavelength region of≥700 nm and size precision can be improved by reducing thickness of an anodically oxidized film. SOLUTION: The structural parts for the optical apparatus is provided with an incident part where light at least having wavelength of≥700 nm is made incident inside the optical apparatus and the incident part is constituted of Al or an alloy of Al or Mg. Furthermore, anodic oxidation treatment for forming the anodically oxidized film at least on the incident part is applied and then a surface of the incident part is colored in black by a secondary electrolytic coloring method. COPYRIGHT: (C)2004,JPO