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AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsLaurent Guillermin, Sylvaine Millet
Estimating the term…
Process for bevelling at least one edge (6) of an optical face (3) of an ophthalmic lens (1), which includes a plotting stage in which the successive curvatures of the optical face (3) are plotted in the vicinity of and along the edge (6) to be bevelled. In the plotting stage, the edge (6) to be bevelled is scanned by means of a flat light beam (23) forming a linear light spot (24) on the optical face (3), an image of the light spot (24) is simultaneously formed on optical reception means (26), the successive curvatures of the optical face (3) in the vicinity of the edge (6) are deduced from the successive positions of this image. This process includes a bevelling stage in which the lens (1), rotated about an axis (A1), is brought into contact by its edge (6) with a bevelling tool, and the relative positioning of the lens (1) and of the tool is controlled according to the plots produced.
Process for bevelling at least one edge (5, 6) of an optical face (2, 3) of an ophthalmic lens (1), which includes a plotting stage in which the successive curvatures (α) of the optical face (2, 3) are plotted in the vicinity of and along the edge (5, 6) to be bevelled, characterized in that, in the plotting stage, the edge (5, 6) to be bevelled is scanned using a flat light beam (23) forming a linear light spot (24) on the optical face (2, 3), an image (29) of the light spot (24) is simultaneously formed on optical reception means (26), the successive curvatures (α) of the optical face (2,3) are deduced in the vicinity of the edge (5, 6) from the successive positions of this image (29), and in that it includes a bevelling stage in which the lens (1), rotated about an axis (A1), is brought into contact by its edge (5, 6) with a bevelling tool (9), and the relative positioning of the lens (1) and of the tool (9) is controlled according to the plots produced.
Process according to one of the previous claims, characterized in that the or both light beam (23) is separated from the rotational axis (A1) of the lens (1).
Process according to one of the previous claims, characterized in that the light beam (23) and the rotational axis (A1) of the lens (1) are approximately coplanar.
Process according to one of the previous claims, characterized in that said light beam (23) is coherent.
Machine (8) for bevelling an edge (5, 6) of an optical face (2, 3) of an ophthalmic lens (1), this machine (8) including a rotary support (7, 7′) for the mounting of the lens (1), a bevelling tool (9), means (M1) for displacing the support (7, 7′) and the tool (9) with respect to each other in a direction parallel to the rotational axis (A1) of the support (7, 7′), a control unit (19) suitable for controlling said means of displacement (M1), characterized in that it includes at least one optical measurement device (20, 21) containing a light source (22) producing a flat light beam (23) directed towards said optical face (2, 3) in order to form there a linear light spot (24) crossing the edge (5, 6) to be bevelled, optical reception means (26) pointed towards said light spot (24) and connected to said control unit (19), the latter including means for calculating the curvature (α) of said face (2, 3) in the vicinity of the edge (5, 6) to be bevelled according to the plots produced on the optical reception means (26).
Dependencies are inferred from the claim text.