| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of producing an optical glass element by which a change in the refractive index caused by the change of conditions or the like in the manufacture of a glass molded article by press molding can precisely be fine-adjusted. <P>SOLUTION: When the measured refractive index of the glass molded article obtained by press-molding a glass material is smaller than the designed value, the glass molded article is fine-adjusted to approach the designed value by applying heat-treatment in a low temperature range. The lower limit temperature in the heat-treatment temperature range is higher than the temperature 300°C lower than the distortion point of the glass material and the upper limit temperature is less than the temperature 150°C lower than the distortion point of the glass material. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
