Method for producing a multifocal correction lens, and...

B - Operations – Transporting – 24 – B

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B24B 13/00 (2006.01) B24B 13/06 (2006.01) B24B 41/06 (2006.01)

Patent

CA 2341584

The invention concerns a method for producing multifocal correction lenses from semi-finished lenses (1) having at least a first positioning marker M, associated with a correction A called distant vision correction, and a second positioning marker M' associated with a correction B called near vision correction. The method comprises a step which consists in a surface grinding of the semi-finished lens (1) on an internal surface of said lens. The latter is inclined at a specific angle (.beta.), for example using a wedge, so as to induce a prism of prismatic deviation such that the distant vision and the near vision optical centres are brought together and merge. The invention also concerns a system controlled by a data processing device, for example a micro-computer (8), for automatically carrying out the surface grinding step using a recorded programme and parameters input (80) by an operator.

L'invention concerne un procédé de realisation de verres correcteurs à foyers multiples à partir de verres semi-finis (1) présentant au moins un premier repère de positionnement M, associé à une correction A dite de vision lointaine, et un second repère de positionnement M' associé à une correction B dite de vision rapprochée. Le procédé comprend une étape de surfaçage du verre semi-fini (1) effectuée sur une face interne dudit verre. Ce dernier est incliné d'un angle déterminé .beta., par exemple à l'aide d'une cale, de manière à induire un prisme de déviation prismique tel que les centres optiques de vision lointaine et de vision rapprochée soient ramenés confondus. L'invention concerne également un système piloté par un dispositif de traitement de l'information, par exemple un micro-ordinateur (8), permettant la réalisation automatique de l'étape de surfaçage à l'aide d'un programme enregistré et de paramètres saisis (80) par un opérateur.

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