Patent ID: 6099764
Filing Date: 2000-08-08
Classification: B29C,B29D,Y10S

Abstract:
A method for molding an optical lens without using a gasket, comprising the steps of:a. positioning a front mold and a back mold whose facing inside surfaces are a negative image of the surfaces of the optical lens at a proper distance and rotational orientation to each other, both the front mold and back mold having an edge;b. wrapping around the edges of the front mold and back mold with a strip to form a sleeve, wherein the strip has a first end and an opposed second end, an interior surface and an opposed outer surface, and a recess channel formed on the inside surface extending from the first end to the second end, and wherein the formed sleeve has a longitudinal axis and a diameter and cooperates with the front mold and back mold to define a molding cavity, the molding cavity in fluid communication with the recess channel;c. injecting a fluid lens-forming material into the molding cavity through the recess channel; andd. curing the fluid lens-forming material so that the fluid lens-forming material is hardened to form the optical lens,wherein the sleeve allows the front mold and back mold to slide along at least a portion of the longitudinal axis and the diameter of the sleeve remains substantially constant during the curing of the fluid lens-forming material.