Patent ID: 7500844

Claim:
A mold for molding an optical element from a liquid polymerizable composition comprising: a mold cavity having a generally circular shape with a geometrical center and a main plane; a sprue base with a longitudinal axis; and a feed connection that makes the sprue base communicate with a feed sill of the mold cavity; wherein: the longitudinal axis of the sprue base and the geometrical center of the mold cavity define a mold symmetry plane, wherein the mold symmetry plane is orthogonal to the main plane of the mold cavity, and the intersection of the mold symmetry plane and the main plane defines a mold main axis; the longitudinal axis of the sprue base forms an angle from 0 to 30° with a line perpendicular to the main plane of the mold cavity; and the feed connection comprises: a delta-shaped, central feed channel expanding, in the mold cavity main plane, towards the mold cavity; and two side feed channels arranged symmetrically to the mold symmetry plane on either side of the central channel, each side feed channel comprising a curved part that tangentially extends along the feed sill of the mold cavity up to an outer end so that a straight line running through the outer end of a tangential curved part and the geometrical center of the mold cavity forms an angle ranging from 0° to 60° with a straight line running through the geometrical center of the mold cavity and perpendicular to the mold symmetry plane.