| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for designing the molding face shape in a mold where a proper mold can be obtained with the frequency of correction reduced. SOLUTION: In the designing method, a temporary molding face shape for producing a desired lens is designed (S2), the shape after thermal expansion of the temporary molding face shape in the glass transition point (Tg) of a glass raw material for the lens is calculated (S3), from the temporary molding face shape after thermal expansion, the shape of the lens after thermal expansion is obtained (S4), from the shape of the lens after thermal expansion, the shape of the lens at ordinary temperature is calculated (S5), and, the calculated shape of the lens and the shape of the desired lens are compared, and whether the shape error lies within an allowable range or not is judged (S6). In the case the shape error lies within the allowable range, the temporary molding face is decided as the molding face shape. Since, in this designing method, upon designing the temporary molding face shape, the deformation of the temporary molding face shape caused by thermal expansion from the ordinary temperature of the raw material glass material to the glass transition point (Tg) of the raw material glass material, and the deformation of the lens caused by thermal shrinkage generated from the glass transition point (Tg) to the ordinary temperature are considered, the temporary molding face shape can be made close to the desired molding face shape. COPYRIGHT: (C)2007,JPO&INPIT |
