| 摘要 |
PROBLEM TO BE SOLVED: To allow the sure releasing of formed optical elements from dies by constituting a forming device for press forming the optical elements in such a manner that the forming surface of upper dies and the forming surfaces of lower dies respectively vary in their surface roughness from each other. SOLUTION: The plural upper dies 22 are supported by a moving upper die supporting member 14 via an upper die pressing drum 20 and the plural lower dies 26 are supported by a stationary lower die sill 12 via a lower die pressing drum 24. Further, the forming surfaces of the upper dies 22 and the forming surfaces of the lower dies 26 are so formed as to vary in their surface roughnesses from each other. More preferably, the surface roughness of the forming surfaces among the smaller surface roughness upper dies 22 and the larger roughness lower dies 26 is specified to Rmax of <=0.03μmm. Optical element materials 4 are placed on the forming surfaces of the respective lower dies 26 and are softened by heating with heaters 18 and, thereafter, the moving upper die supporting member 14 is lowered to crush the optical element materials 4 between the upper dies 22 and the lower dies 26, by which the press forming is executed. The upper dies 22 are then risen after cooling and the molded goods of the optical elements are taken out.
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