Essilor International Cie Generale D'optique

Essilor International

Essilor International (Compagnie Generale D'optique)

Alain Chansavoir

Christian Joncour

Francois Brule

Ahmed Haddadi

Michel Nauche

Eric Comte

Xavier Lippens

Jean-François Cailloux

Jean-François Belly

Daniel Steigelman

Loïc Kabelaan

Armand Achy

Philippe Larue

Frank Paggetti

Jean Francois Belly

Isabelle Lavrador

Bruno Marande

Helene Sottocasa

Nicholas Giraud

Richard Grisel

Christian Ducarouge

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

The pneumatic blocking support which is used to block an optical lens () on a machine or device has means () for fixing it on a corresponding element of the machine or device. The blocking means comprise a central cavity () and a joint () having at least one annular part () against which the lens rests in order to define a depression chamber () with said cavity and joint. The blocking elements include stop members () which are created in order to provide the optical lens with a rigid seat after the elastic compression of the joint.

Pneumatic blocking support for an optical lens

The invention concerns an ophthalmic lens preform having intrinsically at least a mechanical angular indexing member (). It is applicable to the manufacture of lenses in mineral or organic material.

Opthalmic lens preform

A contour reading device, in particular for eyeglass frames, includes a holding arrangement to support a template at a fixed position and a carriage mobile relative to the holding arrangement and carrying a feeler at the end of a rod. To read off the position of a mounting hole in a peripheral area of the template, the device includes a detector arrangement having at least one component constrained to move with the carriage at a given distance from the axis of the rod carrying the feeler, on the same side as a central area of the holding means. Applications include identifying the mounting holes in 'drilled mount' eyeglass lenses.

Contour reading device, in particular for eyeglass lenses

A method for determining measurement parameters from the image of a spectacle wearer wearing a spectacle frame is disclosed in which the position of the center of the pupil of each eye is obtained automatically by analyzing the luminance gradient in the region of the pupils and the positions of the horizontal and vertical straight lines tangential to the frame are also obtained automatically by luminance gradient analysis and extraction of the contours of the frame, enabling said parameters to be calculated accurately.

Method for determining measurement parameters for a spectacle wearer

A method for reading the shape of any elastically deformable article uses a contact feeler to follow the shape to be read. The contact feeler is applied to the article with a force of particular value adapted to cause localized deformation of the article and the coordinates of the contact feeler are noted at the relevant time. Two successive coordinate readings are systematically carried out, one with a first non-zero set point value of the contact feeler application force and the other with a second non-zero set point value of the application force different than the first set point value. The coordinates for a zero set point value of the contact feeler application force are deduced mathematically from the two coordinate readings.

Method for reading the shape of any elastically deformable article, in

A device for fitting a holding part onto an eyeglass lens comprises a plate adapted to receive the eyeglass lens pivoted to a fixed base and a calibrated spring arrangement and a displacement sensor operative between the plate and the base.

Device for fastening a holding part on an eyeglass lens

A device for fitting a handling block to an eyeglass lens to which the handling block adheres temporarily includes a receptacle into which the handling block is push-fitted. An ejector system associated with the receptacle facilitates disengagement of the handling block from the receptacle after it is fitted to the lens. This system is operative outside the receptacle and engages operatively on the eyeglass lens concerned. It comprises two ejector fingers movable parallel to the axis of the receptacle against return springs.

Device for fitting temporary securing means to a workpiece

A pattern simulator is for use with a grinding machine, especially a machine for grinding eyeglass frames, the machine comprising a grinding wheel support shaft, a pattern support shaft coplanar with the grinding wheel support shaft and a box member carrying the pattern support shaft and adapted to pivot relative to the grinding wheel support shaft. A bearing key in the grinding machine is adapted to support a pattern mounted on the pattern support shaft, an end of which overlies the bearing key. The pattern simulator is adapted to conjugate the distance between the grinding wheel support shaft and the pattern support shaft with the angle of rotation of the pattern support shaft on itself relative to a reference. The pattern simulator constitutes a self-contained mechanical entity and comprises a mounting piece adapted to be fitted to the pattern support shaft of the grinding machine and keyed to it to rotate with it. It further comprises a frame rotatably mounted on the mounting piece and a skid carried by the frame adapted to bear on the bearing key of the grinding machine and movable on the frame in translation substantially perpendicularly to an axis of the mounting piece. The pattern simulator finally comprises angulation means adapted to control the angular orientation of the mounting piece about its axis.

Pattern simulator for use with a grinding machine, in particular a

A device for reading contours, as of eyeglass frames, comprises a feeler adapted to be applied to an article in order to read its contour. A carriage supports the feeler and is movable to-and-fro on a guide. A drive motor moves the carriage on the guide. A floating mounting is disposed between the feeler and the drive motor.

Growing community of inventors

Luzancy, France

Alain Chansavoir