Method for determining a position of an optical lens member placed on a lens blocking ring (22). A reference system, blocking ring data, and optical lens member surface data are provided. Position parameters are provided defining a position of a reference point of the surface of the lens member with respect to the main plane of the reference system and an orientation, about the main axis of said placed surface at said reference point. The position of the placed surface is determined according to the position parameters. During a repositioning step (S6) the placed surface is virtually translated and rotated. During an altitude determination step (S7) a difference in position between the blocking ring and the placed surface is determined. The repositioning and altitude determining steps (S6, S7) are repeated so as to minimize the difference in position between the blocking ring and the placed surface.

Method for determining a position of an optical lens member placed on a lens blocking ring (22). A reference system, blocking ring data, and optical lens member surface data are provided. Position parameters are provided defining a position of a reference point of the surface of the lens member with respect to the main plane of the reference system and an orientation, about the main axis of said placed surface at said reference point. The position of the placed surface is determined according to the position parameters. During a repositioning step (S6) the placed surface is virtually translated and rotated. During an altitude determination step (S7) a difference in position between the blocking ring and the placed surface is determined. The repositioning and altitude determining steps (S6, S7) are repeated so as to minimize the difference in position between the blocking ring and the placed surface.

A blocked lens assembly suitable for on-block processing and cleaning includes a blocked lens and a sealing member disposed on at least a portion of an edge and/or surface defined by the blocked lens. The blocked lens further includes a lens blank having a front surface and a back surface, a lens blocking piece to hold the lens blank while processing the back surface of the lens blank, and an adhesive layer, disposed between the front surface of the lens blank and the lens blocking piece, to affix the lens blank to the lens blocking piece. The sealing member protects the blocked lens so as to facilitate cleaning of the blocked lens while the lens blocking piece is affixed to the front surface of the lens blank

A method includes: providing lens blank data relating to the first, second and peripheral blank surfaces of the lens blank; providing optical lens data relating to the first, second and peripheral optical surfaces of the optical lens; virtually positioning the optical lens in the lens blank in a position so that at least one of the first optical surface or the second optical surface is included within the lens blank; evaluating a manufacturing prism cost function, the machining prism cost function corresponding to a weighed sum of the first manufacturing prism to be used when blocking the lens blank on the second surface to machine the first optical surface and of the second manufacturing prism to be used when blocking the lens blank on the first optical surface to machine the second optical surface. The positioning and evaluation steps are repeated so as to minimize the manufacturing prism cost function.

A device for blocking workpieces has an aligning station that includes a workpiece support for aligning a workpiece. A blocking station comprises a block piece mount and serves to block the aligned workpiece by use of a block material on a block piece, which can be mounted in the block piece mount in a centered manner in relation to a substantially vertically extending blocker axis. A workpiece carriage carries a holding head for the workpiece and is suitably guided and driven to transport the workpiece from the aligning station to the blocking station to position the workpiece along the blocker axis in a defined manner relative to the block piece held in the block piece mount, and to hold the workpiece during blocking in the defined relative position to the block piece with a gap between workpiece and body piece.

A device for blocking workpieces has an aligning station that includes a workpiece support for aligning a workpiece. A blocking station comprises a block piece mount and serves to block the aligned workpiece by use of a block material on a block piece, which can be mounted in the block piece mount in a centered manner in relation to a substantially vertically extending blocker axis. A workpiece carriage carries a holding head for the workpiece and is suitably guided and driven to transport the workpiece from the aligning station to the blocking station to position the workpiece along the blocker axis in a defined manner relative to the block piece held in the block piece mount, and to hold the workpiece during blocking in the defined relative position to the block piece with a gap between workpiece and body piece.

Disclosed is a method for determining location of a lens machining tool (24) having an offset location according to a first direction (Y) smaller than a first predetermined threshold, including the steps of manufacturing a calibration piece (10) according to a predetermined theoretical geometry by using the lens machining tool for providing a at least partially annular groove in a main surface of the calibration piece, the at least partially annular groove being configured to form at least one sharp edge defining a slope discontinuity on the main surface; measuring a distance between the at least one sharp edge and a turning center of the calibration piece for providing data of geometrical characteristics of the calibration piece; and deducing from the measured data a location of the lens machining tool according to a second direction (X) distinct from the first direction.

The invention concerns a method for producing an optical article suitable for edging comprising an antifouling layer on which there is deposited a temporary overlayer for assisting with edging, comprising: depositing, on an optical substrate, an organic antifouling layer comprising at least a fluorinated polymer compound comprising hydrolysable functions; and depositing, on the antifouling layer, an overlayer for assisting with edging, of mineral nature, comprising one or more metal fluorides and/or one or more metal oxides or hydroxides;

method characterised in that it further comprises a step of accelerated grafting of the antifouling layer chosen from:

(a) a treatment of the deposited antifouling layer in a humid atmosphere of the deposited antifouling layer and

(b) a catalytic treatment in the acidic or basic vapour phase of the deposited antifouling layer.

The invention concerns a method for producing an optical article suitable for edging comprising an antifouling layer on which there is deposited a temporary overlayer for assisting with edging, comprising: depositing, on an optical substrate, an organic antifouling layer comprising at least a fluorinated polymer compound comprising hydrolysable functions; and depositing, on the antifouling layer, an overlayer for assisting with edging, of mineral nature, comprising one or more metal fluorides and/or one or more metal oxides or hydroxides;

method characterised in that it further comprises a step of accelerated grafting of the antifouling layer chosen from:

(a) a treatment of the deposited antifouling layer in a humid atmosphere of the deposited antifouling layer and

(b) a catalytic treatment in the acidic or basic vapour phase of the deposited antifouling layer.

Disclosed is a lamination machine including: a film support for receiving a functional film to be laminated; an article support configured to receive and position the optical article in a predetermined orientation; and an actuating member configured to move the film support and the article support toward each other for laminating at a predetermined pressure the functional film received in the film support onto the optical article received within the article support. The article support is a blocker support configured to receive a surfacing blocker onto which the optical article is to be disposed for lamination, the article support being further configured to transmit laminating forces induced by the predetermined pressure to the lamination machine during a lamination operation.