| 摘要 |
The most appropriate composition and molding condition for obtaining a glass of desired refractive index by unannealed press molding are selected within a short period of time, thereby attaining an efficient glass production. In this process, the glass composition exhibiting a target refractive index when having undergone annealing treatment is regarded as a basic composition. The range whose bounds pair is the value of target refractive index + (100 to 850)810is regarded as a given range. Multiple glass compositions whose refractive index values estimated on the basis of composition variance from the basic composition regularly change within the given range are provided by changing of component ratios of the basic composition and are regarded as candidate compositions. The glass molded items from the candidate compositions are prepared under given molding condition, and the refractive index of each thereof is measured. The candidate composition of the glass molded item whose refractive index is in agreement with or most close to the target refractive index is determined as implementation composition. When the refractive index measurement values are not in agreement, the molding condition is regularly altered, and the glass molded items of implementation composition are obtained under multiple molding conditions. The refractive index of each thereof is measured, and the molding condition for the glass molded item whose refractive index is in agreement with or most close to the target refractive index is determined as implementation molding condition.
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