| 摘要 |
PURPOSE:To obtain an optical element free of sink mark and having high dimensional accuracy, continuously by a hot press, by supplying the raw material from the hopper to the space between a pair of vertically arranged molding means using a transfer screw. CONSTITUTION:The raw material 23 is charged into the hopper 21. The thermally insulated housing 1 is closed by closing the door 2, the vacuum pump placed on the table 4 is operated to evacuate the housing 1, and the raw material 23 is heated by electrifying the heater 25. The transfer screw 17 is rotated with the driving apparatus 19 and the driving shaft 18, and the raw material 23 is transferred from the outlet port 22 of the hopper 21 to the side hole 8 of the holder 6, sent via the inclined face 20, dropped into the lower hole 10 of the holder 6 and placed on the forming face of the lower molding member 13. the air cylinder 12 is actuated to drop the upper molding member 11 against the lower molding member 13 to effect the molding of the raw material 23. The molded product is dropped from the top part at the center 31 of the tray member 28 to the receiving cavity 32 by raising the member 11 and slowly lowering the member 13.
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