List of toroidal surface, in particular for ophthalmic lenses

摘要

The apparatus comprises a cutting tool 30 carries a cutting head 14 so as to rotate about an axis 48 and having a cutting point 34, rejected the axis 48 of a distance r corresponding to one of the radii of curvature to be given at a roughing of the lens l. this is the reach of a roughing head 18. One of the heads 14 and 18 is adapted to oscillate in a direction transverse to the other and the radius of this wobble corresponds to the second radius of curvature r to be given at the roughing l / p & & p & the apparatus is used for the manufacture of ophthalmic lenses for correcting astigmatism.