| 摘要 |
A mold for molding an optical element, in particular using a reaction injection molding method (RIM). The mold comprises a generally circular shaped, mold cavity having 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, the longitudinal axis of the sprue base and the geometrical center of the mold cavity defining a mold symmetry plane orthogonal to the main plane of the mold cavity, which intersection with said main plane defines a mold main axis, characterized in that the longitudinal axis of the sprue base together with a line perpendicular to the main plane of the mold cavity forms an angle ranging from 0 to 30°, preferably from 0 to 15°. Methods of using the mold and objects made thereby are also disclosed.
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