Mold assembly for lens blank

摘要

Mold assembly for forming a lens blank for an ophthalmic lens, wherein upper and lower tapered inner surfaces (38, 40, 94) of intermediate sleeve (14) are adapted to be held in press-fitting engagement with respective outer surfaces (24, 92, 50, 96) of upper and lower molds (12, 16), to effect fluid-tight connection of the upper and lower molds with the intermediate sleeve, with the upper mold being held in abutting contact with a shoulder (42, 100) of the intermediate sleeve, and with stopper surfaces (44, 52, 49, 98) of the intermediate and lower molds being held in abutting contact with each other to determine a relative axial position therebetween, such that a mold cavity (60) to be filled with a liquid monomer composition (66) is defined by the upper and lower molds and the intermediate sleeve, while a liquid reservoir (62) for storing an excess amount of the monomer composition which has been discharged from the mold cavity is defined by the upper mold and the intermediate mold.