Process for edge-machining of optical lenses

• Main Authors: GOTTSCHALD LUTZ, WAGNER JOCHEN
• Format: Patent
• Language: English
• Published: 15.06.2004
• Edition: 7
• Subjects: DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS; GRINDING; MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; PERFORMING OPERATIONS; POLISHING; TRANSPORTING

A process for edge-machining an optical (spectacle) lens including preliminary machining of an edge of the lens rotatable in controlled manner about a rotational axis of a workpiece by a first edge-machining tool adjustable radially relative to the rotational axis of the workpiece, whereby the lens is given a circumferential contour which corresponds to the circumferential contour of a lens holder apart from a slight degree of oversizing, contactless measurement of the preliminarily machined lens edge, and finish-machining of the lens edge, taking account of the detected edge data of the preliminarily machined lens, by means of a second edge-machining tool adjustable radially relative to the rotational axis of the workpiece, whereby the lens is provided with a circumferential contour substantially complementary to the circumferential contour of the lens holder. During preliminary machining of the lens edge, an edge surface which is definedly matt in the dry state is produced and then the dry or dried surface is measured by means of a measuring arrangement comprising a laser and a video camera and operating in a particular way without contact, in order to determine the edge data of the preliminarily machined lens with increased accuracy and markedly quicker than hitherto.