| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To equalize the temperature of a molding raw material in a mold and to preform high accuracy and efficient forming without reducing the heating efficiency of the mold. <P>SOLUTION: In a mold 11 in which an upper mold 12 and a lower mold 13 are countered and inserted into a tube-like middle mold 14, a molding surface 12a of the upper mold 12, a molding surface 13a of the lower mold 13, and an inner surface of the middle mold 14 compose a forming space S, and an optical element material 16 located in the forming space S is heated to a predetermined temperature for press-forming; a heat insulating member 15 is integrally prepared in an outer periphery of the middle mold 14 over all of the circumference, improvement in heating efficiency by heat insulating effect is attained by a thermal insulation effect of the heat insulating member 15, without being influenced by an external temperature distribution, while uniformly maintaining the temperature distribution of the internal optical element material 16, and high accuracy and efficient forming are performed. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
