MANDREL FOR USE IN THE MACHINING OF OPHTHALMIC LENSES

A mandrel (1) for holding an ophthalmic lens member blank (52) during machining is disclosed. The mandrel (1) comprises a front surface (6) for receiving an ophthalmic lens member blank (52) to be machined; a rear surface (8) opposite the front surface (6); and one or more through-holes (10) extendi...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	RICKETTS, David, EVANS, Edward James Harley
Format:	Patent
Sprache:	eng
Schlagworte:	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 PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A mandrel (1) for holding an ophthalmic lens member blank (52) during machining is disclosed. The mandrel (1) comprises a front surface (6) for receiving an ophthalmic lens member blank (52) to be machined; a rear surface (8) opposite the front surface (6); and one or more through-holes (10) extending between the front and rear surfaces (6,8). In use, wax applied to the rear surface (8) contacts an ophthalmic lens member blank (52) received on the front surface 6 via said one or more through-holes (10). Methods of producing an ophthalmic lens using such a mandrel and lenses produced using such a mandrel are also disclosed.