| 摘要 |
PROBLEM TO BE SOLVED: To provide a devise and method that can stably produce an optical element having excellent thickness and surface accuracies with compact and easy constitution. SOLUTION: This device is comprised of a pair of upper and lower metal molds 1 and 2, the former having a flange part 7 that restricts movement of the mold, the latter supported/fixed to a bottom end, cylinder mold 3 containing the metal molds and a control member 4 surrounding the exterior of the cylinder mold with longer axial length, restricting approach/movement of the upper/lower metal molds by having bottom end supported/fixed and upper end contacting the flange. Shrinkage amount of the control member is not smaller than that of upper/lower metal molds and glass material 6 combined. Using this forming devise, a heated glass material that keeps a fixed temperature between upper/ lower metal molds is pressed by lowering the upper metal mold. After the lowering movement of the mold is restricted by the control member, the glass is cooled to form an optical element while keeping the pressure.
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