Lens forming apparatus

摘要

The invention provides a lens forming apparatus that can suppress generation of burrs even if gaps between outer walls of an upper die and a lower die and an inner wall of a trunk die is made wide. A lens forming apparatus 11 according to the present invention includes a trunk die 12 having a through-hole 17 therein; first and second dies 13 and 14 that are fitted into the through-hole 17 from both ends thereof, respectively, and have pressing surfaces 20 and 30 for sandwiching and pressing a forming material 24; and induction-heating coils 15 and 16 that heat the first and second dies 13 and 14 to a temperature equal to or higher than a glass transition point, in a state where the trunk die 12 is not heated and the temperature thereof is set to a temperature equal to or lower than the glass transition point.

主权项

1. A lens forming apparatus, comprising:
a trunk die having a through-hole; first and second dies that are fitted into the through-hole from both ends thereof, respectively, and has pressing surfaces capable of sandwiching and pressing a forming material formed on opposed surfaces thereof; a heating control unit that is controlled to heat the first and second dies to a temperature equal to or higher than a glass transition point, in a state where the trunk die is not heated and a temperature of the trunk die is set to a temperature equal to or lower than the glass transition point; and a member located at a position between outer walls of the first and second dies and an inner wall of the trunk die, a thermal conductivity of the member being lower than that of any of the first die, the second die, and the trunk die, wherein the heating control unit is controls induction heating, and wherein the first and second dies are of a material that is induction-heated, and the trunk die is a dielectric body of a material that is not induction-heated.