Patent ID: 7292399

Claim:
A metal ring-fitted optical device comprising an outer face that is covered with a thin-walled metal ring and optical functional faces formed on both sides of openings of the metal ring; wherein the thin-walled metal ring comprises, inside a cylindrical mold that defines a shape of an outer peripheral side surface, a side cylindrical part of which a diameter is expanded toward the cylindrical mold by pressure applied thereto by optical material disposed inside the side cylindncal part, thereby obtaining a final outer peripheral dimension of the side cylindrical part, a flange provided around one of the openings of the side cylindrical part and extending inward from the side cylindrical part; and a curved cylindrical part which extends from the side cylindrical part toward the other of the openings of the ring, and is folded toward the optical functional face of the optical device formed on a side of the other opening of the ring while pressure is applied to the optical material to be shaped, wherein the optical material intimately contacts the entire inner surface of the side cylindrical part, flange, and the curved cylindrical part.