Essilor International (compagnie Generale D'optique)

Essilor International

Matthieu Le Gall

Yohann Felten

David Freson

Yannick Gordiet

Pascal Thomas

A method for blocking an optical lens () on a holding unit () thanks to a thermoplastic material layer () comprising the steps of: a) providing around the holding unit () a removable part () comprising an upper part surface () which is arranged so as to extend the upper assembling surface () of the holding unit and not to contact the bottom lens surface (); b) providing a predetermined volume of a thermoplastic material; c) orientating the lens () in a desired spatial configuration; d) positioning the lens () contacting the thermoplastic material of step b) at a soften or melted state and pressing the lens () so as to keep the lens spatial configuration constant and to let the thermoplastic material flow from the upper assembling surface () of the holding unit to at least a part of the upper part surface () of the removable part (); e) removing the removable part.

Lens blocking method and related device

A method of deblocking a lens component () fixed on a thermoplastic block () of an ophthalmic lens block comprising the steps of: a) applying a pushing strain on the surface () of the lens component fixed on the thermoplastic block; b) providing a warm gas flow at the interface between the lens component () and the thermoplastic block; and maintaining the pushing strain during the step of providing the warm gas flow at the interface between the lens component and the thermoplastic block, wherein the stress applied to obtain the pushing strain of step a) is greater or equal to 0.1 MPa and/or less or equal to 1 Mpa, and wherein the temperature of the warm gas flow of step b) is greater or equal to 30&#xb0; and/or less or equal to 70&#xb0; C.

Lens blocking and deblocking method and related device

A method of deblocking an ophthalmic lens component () blocked on a thermoplastic layer () arranged on the holding surface () of a lens holding block () comprising the step of applying a pushing force on the thermoplastic layer (), wherein the pushing force is greater or equal to 100 N and smaller or equal to 1000 N and wherein the pushing force is applied in a region of the thermoplastic layer () situated at a distance of at least 17.5 mm from the fitting point or prism reference point of the ophthalmic lens component ().

Lens deblocking method and related device

A method for blocking an optical lens () comprising a moving step in which the optical lens () is moved from a first reference position (P) to a second reference position (P), so as to be in contact with a blocking material (), the blocking material () being in a molding block (), the second reference position (P) being a function of the first reference position (P), wherein the method further comprises an orienting step in which the optical lens () is oriented in the first reference position (P) and placed on a plurality of pre-located pins () which are vertically translated into a preset position (Z, Z, Z), so that, when the optical lens () is placed on the plurality of pre-located pins (), the optical lens () is oriented in the first reference position (P) where the prism of the optical lens () corresponds to a desired prism (&#x3b1;, &#x3b2;, Z).

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Charenton le Pont, France

Matthieu Le Gall