Abstract: Process for plotting the shape of a contour (5, 6) of a previously machined ophthalmic lens (1), which comprises the steps of: illuminating an optical face (2, 3) of the lens (1) with a flat light beam (15) to form a linear light spot (16) on this face (2, 3), such that the beam (15) extends beyond said face (2, 3) and illuminates the contour (5, 6); forming on the optical reception element (18) an image of the light spot (16); rotating the lens (1) about an axis (A); scanning the contour (5, 6) with the light beam (15); plotting concomitantly on the optical reception element (18) the successive positions of at least one single point of this image corresponding to the illuminated point of the contour (5, 6); deducing the shape of the contour (5, 6).

Abstract: Process for bevelling at least one edge (6) of an optical face (3) of an ophthalmic lens (1), in which the successive curvatures of the optical face (3) are plotted in the vicinity of and along the edge (6) to be bevelled. The edge (6) to be bevelled is scanned with 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 elements (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. Then the lens (1) is 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.

Abstract: Process for grinding the rim of an ophthalmic lens that has two opposite faces, following a predetermined contour corresponding to that of a ring of a spectacle frame in which the lens is intended to be mounted, the contour being delimited on each of the faces by an edge, and the process includes a plotting stage in which the three-dimensional shape of at least one of the edges is plotted. In the plotting stage, the edge is scanned on the illuminated face of lens using a light beam forming a light spot on the face, the successive positions of an image of the light spot are plotted simultaneously on optical reception elements pointing towards the light spot, and the three-dimensional shape of the edge is deduced from the plots made, machining of the lens being carried out according to the plot or plots.

Abstract: Process for plotting the shape of a contour (5, 6) of a previously machined ophthalmic lens (1), which comprises the operations consisting of:

Abstract: Process for grinding the rim of an ophthalmic lens that has two opposite faces, following a predetermined contour corresponding to that of a ring of a spectacle frame in which the lens is intended to be mounted, the contour being delimited on each of the faces by an edge, and the process includes a plotting stage in which the three-dimensional shape of at least one of the edges is plotted. In the plotting stage, the edge is scanned on the illuminated face of lens using a light beam forming a light spot on the face, the successive positions of an image of the light spot are plotted simultaneously on optical reception elements pointing towards the light spot, and the three-dimensional shape of the edge is deduced from the plots made, machining of the lens being carried out according to the plot or plots.

Abstract: 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.