| 摘要 |
PROBLEM TO BE SOLVED: To impart an arbitrary curvature of a lenz by utilizing deformation of a lenz shape, and to decrease the number of molds in stock either by heating while a mold with a curvature is brought into contact with an intermediate molded article formed in advance, or by bringing it into contact with the mold to mold it into a lens shape after heating is started or after heating. SOLUTION: An intermediate molded article 1 is formed in advance and its convex side face is molded into a precise molded face and the concave side is a molded face with no special designation and a finished lens is made by grinding and abrading. In addition, for a glass mold, a precise face with a spherical surface degree is provided on the concave face side. In addition, an elastic pad material 3 is brought into contact with a concave face side of an intermediate molded article 1 and the intermediate molded article 1 is pressed by loading of a wt. 4. Under this condition, the whole is heated at a temp. (110 deg.C) being at least the glass transition temp. for 1hr and then, it is naturally cooled to room temp. to remove the wt. 4 and the pad material 3. In addition, the concave face side of the intermediate molded article deformed by heating is ground and abraded to prepare a finished produce. As a specified spherical surface degree can be prepd. by heat deformation like this, 4-5 kinds of intermediate molded articles are sufficient for the purpose. |
