Press-molding apparatus and method of producing an optical element
AssigneeHoya Corporation
InventorsTadayuki Fujimoto, Shinji Hada
Life of this patent
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Abstract
In a press-molding apparatus having upper and lower forming dies (413a, 413b) arranged opposite to each other and upper-die and lower-die heating arrangements for induction-heating the upper and the lower forming dies, the upper-die heating arrangement includes an upper-die induction heating coil (410a), an upper-die power supply (416a), and an upper die temperature controller (417a). The lower-die heating arrangement includes a lower-die induction heating coil (410b), a lower-die power supply 416b, and a lower-die temperature controller (417b). The power supplies are different in oscillation frequency. The upper and the lower forming dies are independently temperature-controlled and heated.
Claims10
A press-molding apparatus comprising upper and lower dies facing with each other and upper-die and lower-die heating means for induction-heating the upper and the lower dies, respectively, wherein:
- the upper-die and the lower-die heating means comprise induction heating coils as upper-die and lower-die heating coils surrounding the upper and the lower dies, respectively, and power supplies connected to the upper-die and the lower-die heating coils, respectively, the upper-die and the lower-die heating means having oscillation frequencies different from each other.
A method of producing an optical element by press-molding a molding material by the use of upper and lower dies facing with each other, the method comprising the step of:
- heating the upper and the lower dies to predetermined temperatures by induction-heating the upper and the lower dies with different oscillation frequencies by the use of upper-die and lower-die heating means each of which has a heating coil and a power supply.
A method of producing an optical element by press-molding a molding material by use of upper and lower dies facing with each other, the method comprising:
- heating the upper and the lower dies in a state where the upper and lower dies are approached to be close or in contact with each other,
- supplying the molding material between the upper and the lower dies when the upper and the lower dies are separated from each other, and
- press-molding the molding material with the upper and the lower dies;
- wherein, in said heating, the upper and the lower dies are heated to predetermined temperatures by induction-heating with the upper-die and the lower-die heating means, respectively, with oscillation frequencies different from each other, said upper-die and said lower-die heating means each of which comprises a heating coil and a power supply.
Dependencies are inferred from the claim text.