| 摘要 |
PURPOSE:To obtain the titled optical element in a short time by cooling an optical element while keeping the non-optical face of the element at a temp. higher than that of the optical face during cooling to prevent the generation of internal stress when the optical element made of glass is produced by molding. CONSTITUTION:A glass material for molding the optical element is supplied into the cavity formed between plural molding members such as barrel dies 2 and 6 and forming dies 4 and 5, and heated and softened to produce the optical element 1 by molding. When the element is cooled, the non-optical face 8 of the glass optical element 1 which is not used for the transmission or reflection of light is heated by a heater 3 provided in the barrel die 2, and kept at a temp. higher than that of the optical face 7 which is used for the transmission or reflection of light. Under such conditions, the element is cooled. Consequently, the stress generated in the optical element 1 is relieved while only the non-optical face 8 is deformed, and the optical element 1 having the optical face 7 with excellent form precision can be obtained.
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