Contour reading device for a spectacles rim, sensor for the same, and application to the edging of the lens to be mounted

摘要

The method involves measuring the shape of the inner surface (10) of a spectacle lens rim (11). This is to produce the correct shape for the lens edge to fit it makes use of a mobile feeler (12) with its positions recorded in a co-ordinate system. The feeler head (15) is used to scan the inner surface of the lens rim between two or more points on at least one side of the rim recess. The lens rim recess has a dihedral cross-section the feeler head is used to scan sufficient points on its surface to allow its shape to be reproduced from the co-ordinates obtained. The feeler used for the procedure can be a contact feeler with interchangeable heads, e.g. spherical in shape.