Patent ID: 7919020

Claim:
A method of manufacturing a plastic lens by casting a liquid plastic lens starting material comprising: continuously providing said liquid material to a casting jig having a casting jig opening for exuding said liquid material; moving said casting jig towards a casting mold having a casting hole with a casting inlet opening as said liquid material is being exuded from said casting jig opening; flowing said exuded liquid material out of said casting jig opening into said casting mold through said casting inlet opening; and curing said liquid starting material to form a molded article, wherein said casting mold has an internal cavity and has at diametrically opposed positions a casting hole for casting said liquid material into the cavity and a discharge hole for discharging gases in the cavity or excess liquid material in the cavity to the exterior of the casting mold, wherein said moving step comprises moving said jig to a position below said casting mold in the direction of gravity for communicating between said casting jig opening and said casting inlet opening, wherein said casting step comprises casting said liquid material into said casting mold by exuding said liquid material from said casting jig opening upwards against gravity and through said casting hole in a state where the casting mold is tilted from or perpendicular to a horizontal plane as well as the discharge hole is positioned at a top of said casting mold in a direction of gravity, wherein said flowing step further comprises, during a period, from when said casting inlet opening begins to communicate with said casting jig opening to when the communication ends, flowing a portion of the liquid material from the casting jig opening into the casting hole, and flowing the remaining portion downward in a direction of gravity without flowing into the casting hole.