Method for molding vitreous optical elements
AssigneeFuji Photo Optical Co., Ltd.
InventorMasaaki Fukuda
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Abstract
A method for molding optical glass elements including the steps of injecting molten glass material into a mold cavity through an injection port, runner and gate; cooling molten glass material in the mold cavity to a solidified state; and applying vibrations to solidified glass material in the mold cavity through a gate-forming member inserted into the mold assembly to form a gate to make a gate cut by concentration of stresses at boundary regions between the gate and the mold cavity.
Claims5
In a method for molding optical glass elements by the use of a mold assembly including a mold cavity with transfer surfaces in the shape of optical surfaces to be formed on a molded optical element, a molten glass injection port disconnectibly connected to a glass injection nozzle, a sprue communicating said molten glass injection port with said mold cavity through a gate, a movable gate-forming member inserted into said mold assembly to form at least part of said gate, and a vibration generating means for applying vibrations to said gate-forming member, comprising the steps of:
- injecting molten glass material into said mold cavity through said injection port and gate;
- cooling molten glass material in said mold cavity to a solidified state;
- and
- vibrating said solidified glass material in said mold cavity through said gate-forming member to make a gate cut by concentration of stresses at boundary regions between said gate and said mold cavity.
Dependencies are inferred from the claim text.