Essilor International (compagnie Generale D'optique)

Essilor International

Essilor International Cie Generale D'optique

Xavier Lippens

Gilles Le Saux

Alain Chansavoir

Cedric Lemaire

Cédric Lemaire

Jean-François Cailloux

Daniel Steigelman

Patrick Bertrand

Daniel Simonin

Isabelle Lavrador

Philippe Larue

Loïc Kabelaan

Christophe Lafay

Disclosed is a method for checking at least one geometric characteristic and one optical characteristic of a trimmed ophthalmic lens () including the following steps: a) arranging the trimmed ophthalmic lens on a support (), b) capturing at least one image of the trimmed ophthalmic lens, c) determining, from the image, a measured geometric characteristic of the trimmed ophthalmic lens, d) determining at least one measured optical characteristic of the trimmed ophthalmic lens in a reference frame of the image captured in step b), e) comparing the measured geometric characteristic associated with the measured optical characteristic to a predefined desired ophthalmic lens model, including at least one desired geometric characteristic and one associated desired optical characteristic. Also disclosed is an associated checking device.

Method for checking a geometric characteristic and an optical characteristic of a trimmed ophthalmic lens and associated device

A method for printing an ink jet marking on a non-wetting surface for liquid ink, includes forming at least a first drop of solidified ink on the surface, by ejecting, by means of a printhead, a first drop of liquid ink at a first given ejection velocity and with a first given volume, and depositing, on at least one portion of said first drop of solidified ink, at least a second drop of ink having a second volume VOL, by ejecting, by means of a printhead, a second drop of liquid ink at an ejection velocity.

Method for printing an ink jet marking on a surface

A process for controlling a lens manufacturing process comprising the steps of: a) manufacturing a master lens according to a manufacturing process using a manufacturing device, b) measuring by using at least a measuring device at least one parameter of the master lens of step a), c) recording the value of the parameter, d) repeating regularly step a) to c) and checking the evolution of the parameter over time, wherein the evolution of at least one parameter of the manufacturing device used during the lens manufacturing process is checked over time and the evolution over time of at least one parameter of the master lens is related with the evolution over time of the at least one parameter of the manufacturing device.

Process for controlling a lens manufacturing process

A method and device for measurement of the geometrical or optical structure of an optical component such as a lens or a mold for making lens are provided. The method comprises the steps of illuminating the optical component to be measured with incident light having a known wavefront, measuring, in a given plane, the maps of the wavefront slopes of the light, after reflection at or transmission by the optical component, and deducing the surface topography or refraction index map of the optical component to be measured from the measurements of the slope maps by the application of at least one calculating procedure. The calculating procedure comprises a step in which a result surface is initialized using a simple starting surface SD' and at least one optimization step; each optimization step involves calculation of the value of a merit function representative of the departure between the result surface and the surface to be measured of the optical component and, minimization of said value varying said result surface, said variation being expressed in the form of at least one intermediate surface S.sub.i.

Optimization method and device for direct measurement of an optical

To determine the focal power of an ophthalmic lens, a plurality of light rays are passed through the lens and a photosensitive position sensor is disposed on the exit side of the lens to measure the coordinates of the points at which the light beams impinge on an analysis plane perpendicular to the lens axis. The light rays comprise three light rays on a circle and a light ray on the system axis.

Method and device for determining lens characteristics including its

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Charenton-le-Pont, France

Xavier Lippens