Patent ID: 6936197
Filing Date: 2005-08-30
Classification: B29C,B29D,B29L,Y10S

Abstract:
1. A method for making a plastic lens comprising providing a front mold having a reflective, non-ultraviolet (UV) absorptive inner surface; providing a back mold which is UV light transmissive; disposing the front mold and the back mold in a UV light transparent gasket, the gasket defining a lower inner edge for removably sealing the front mold to the gasket, the gasket further defining an upper inner edge for holding the back mold in a spaced apart relationship to the lower inner edge, the space between the upper and lower inner edges defining a lens forming cavity when the front mold and the back mold are positioned in the gasket; the lower inner edge of the gasket extending in a radially inward direction around an inner surface of the gasket; the lower inner edge having an upper surface which is in a spaced apart relationship to the upper inner edge, the lower inner edge and the upper inner edge defining a space therebetween in which the front mold is removably sealed within and is held in position in the gasket by the lower inner edge; dispensing a predetermined quantity of a UV curable lens forming resin material in the lens forming cavity, the resin material comprising at least one a polymerizable material and at least one photoinitiator, which cure when exposed to UV light; and, exposing the dispensed resin material in the lens forming cavity to a source of UV light for a predetermined length of time at a predetermined intensity to cure the resin material without the need for either cooling or the addition of heat to the resin material.