| 摘要 |
PURPOSE:To obtain the title glass mold having high and stable accuracy at a low cost without carrying out machining by manufacturing a glass mold by precision glass pressing under specified conditions when a glass mold for forming a plastic lens by casting and polymn. is manufactured. CONSTITUTION:When a glass mold for forming a plastic lens by casting and polymn. is manufactured, glass stock is held between a pair of upper and lower molding tools, the tools are heated in an inert gaseous atmosphere to heat the glass stock to a temp. between the transition point and softening point and the heated stock is pressed. By this precision glass pressing, a glass mold is manufactured. |
