Methods for manufacturing curved frames "3d acetate" for spectacles

Abstract

The invention relates to a method of fabricating acetate eyeglass frame fronts with a frame curvature and consequent lens seats, which is customized to conform with the curvature of the lenses to be fitted into said seats which, according to the visual defect to be corrected, may have different, possibly asymmetric, curvatures. The invention also relates to the frames with curved fronts obtained with the method. Fabrication is carried out by electronically controlled milling operations from an acetate plate (1), having predetermined thickness (S), length (L) and height (H) values, on which additional elements (2, 3, 4, 5) made of the same material, possibly of different colors, are applied, which are attached at least proximate to the end sides of the length extent (L) of the plate at the lens seats. Such additional elements help to locally increase the thickness (S) of the plate to a value (S1) that accommodates the dimensions that the frame shall have as a result of the curvature of the front at the lens seats, relative to the middle region, once the milling operations have been completed. The additional elements (2, 3, 4, and 5) are pre-cut and then stably fixed to the plate (1) by direct friction welding on the plate, without using chemicals or adhesives.

Dependencies are inferred from the claim text.