Patent ID: 8277704

Claim:
A method of manufacturing a formed article, wherein the formed article is a casting mold or a portion of a casting mold for a progressive dioptric power eyeglass lens, the method comprising: positioning a forming material comprised of a glass on a forming surface of a mold, the forming surface having a free-form shape, heating the forming material to a temperature exceeding a glass transition temperature of the glass, whereby the forming material is unable to stand on its own weight and becomes soft, changing its shape due to gravity, and resulting in bringing a lower surface of the forming material into tight contact with the forming surface to form an upper surface of the forming material into a free-form optical surface, and wherein as the mold, a mold having, on a forming surface thereof, a plurality of irregularities with a maximum height Rmax ranging from 3.1 to 100 micrometers and an average spacing S between local peaks ranging from 0.01 to 1.00 mm is employed, wherein the plurality of irregularities form a circular pattern, an elliptical pattern or a streaky pattern; the mold has through-holes having a diameter in the range of 0.3 to 0.5 mm and the through-holes are provided such that positions corresponding to reference points for measurement of a dioptric power of the progressive dioptric eyeglass lens on the lower surface of the forming material do not overlap openings on the forming surface side when the forming surface and the lower surface of the forming material are brought into tight contact; and applying suction through the through-holes.