Essilor International (compagnie Generale D'optique)

Essilor International

Yannick Gordiet

Yohann Felten

Romain Paillet

Matthieu Le Gall

José Alcorta

Maxime Olive

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

Use of a thermoplastic material for blocking an optical substrate () in a machining position, wherein the thermoplastic material is formulated from a composition comprising a shellac and a plasticizer where the shellac and the plasticizer are chosen so as to have the softening point of the thermoplastic material greater than or equal to 60&#xb0; C. and smaller than or equal to 85&#xb0; C.

Thermoplastic material

Method of blocking an unfinished optical lens to be machined, the unfinished optical lens comprising an unfinished face and a second face, the method comprising: an unfinished optical lens providing step in which the unfinished optical lens is provided; a positioning step in which the unfinished optical lens is positioned in a first reference position by positioning the unfinished face of the unfinished optical lens on the top of at least three pins; a preformed optical substrate block providing step in which a preformed optical substrate block is provided; a docking step in which the second face of the unfinished optical lens in the first reference position is docked to the docking surface of the preformed optical substrate block.

Growing community of inventors

Charenton le Pont, France

Yannick Gordiet