| 摘要 |
PROBLEM TO BE SOLVED: To form high precision optical elements such as a glass lens extremely high in eccentricity precision, thickness precision, and profile irregularity. SOLUTION: In the state where a molding raw stock P is housed between a pair of an upper mold 3 and a lower mold 4 having opposed molding surfaces 3c and 4d respectively, the upper mold 3 and the lower mold 4 are inserted to a barrel mold 2 for regulating the mutual positional relation of the upper and lower molds 3 and 4, and while pressing the upper mold 3 via an interposing member 5 which is placed on the upper surface 3d of the upper mold 3 and provided with a spherical projection 10 at almost the center of its upper surface and a vent hole 5c communicating with the upper surface 3d of the upper mold 3, the lower surface 5a of the interposing member 5 is made to abut on the upper surface 3d of the upper mold 3 and the upper surface 2a of the barrel mold 2, then the mold 1 is cooled, and the upper mold 3 is lowered by its own weight while following the volume shrinkage of the molding raw stock by cooling. COPYRIGHT: (C)2006,JPO&NCIPI
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