A system for monitoring the position of a blocking device on an ophthalmic lens (20) having at least one marking comprises: —a mechanical structure adapted to cooperate with the blocking device; —an image sensor (4) observing the ophthalmic lens (20); —a control unit (10) connected to the image sensor (4) and configured to produce an image having a point of reference with a determined position with respect to the mechanical structure and at least part of the ophthalmic lens (20) including said marking; and—a user interface (12) adapted to display a blocking device positional compensation proposal for an automatic positional compensation or for a manual positional compensation based on the comparison to a predetermined threshold of a distance between the point of reference and the marking on the image. A corresponding method and a method for edging an ophthalmic lens are also proposed.

A system includes a positioning and centering pin (4) configured to be attached to an ophthalmic lens, an attachment member (5) configured to be positioned on and attached to the pin and to be attached to the lens, a tool (20) for positioning the attachment member on the pin, and which includes a body (42) provided with at least one receiving recess configured to at least partially receive at least one of the attachment members and the pin, at least one centering member (48, 56) and at least one guide member (48, 57), which are configured such that, when the attachment member and the pin are mounted on the tool, the attachment member is centered relative to the body and the pin is guided relative to the body, whereby the attachment member is positioned in a predetermined position on the pin.

The invention relates to a method for compensating positioning error in an edging process or in a fastening operation for a raw-edged, finished spectacle lens, the method comprising: —determining centring deviation parameters, said centring deviation parameters indicating the occurrence of positioning errors for the raw-edged, finished spectacle lens during a fastening operation and/or during a subsequent edging process, and —modifying control information with the aid of the determined centring deviation parameters such that the positioning errors for the raw-edged, finished spectacle lens are compensated and/or taken into account. The invention also related to a corresponding device.

An eyeglasses lens machining apparatus works to perform a check operation implementation step of causing the apparatus to implement a check operation for checking a malfunction state of an operation of the apparatus, a self-restoration step of updating a calibration state of the apparatus related to the malfunction state, to self-restore the apparatus from the malfunction state, and a determination step of determining whether to shift to the self-restoration step, based on a result of the check operation. The apparatus works to further perform a measures output step of outputting information related to measures against an operation failure of a component in the apparatus, in which, in the determination step, it is determined whether to shift to the measures output step or shift to the self-restoration step, based on the result of the check operation.

Disclosed is a method implemented by a computer, for determining the position of an optical lens member having a surface placed on a lens blocking ring, the blocking ring including a bearing zone arranged to bear at least partially a placed known surface of the optical lens member when the known surface of the optical lens member is placed on the lens blocking ring and hold by a force applied on the optical lens member, the method includes finding a trio of points of the bearing zone that forms a triangle including the projection on the main plane of the point of application of the force; and a position of the optical lens having a virtual contact between the placed known surface and the ring at the location of the trios of points.

A system for monitoring the position of a blocking device on an ophthalmic lens (20) having at least one marking comprises: a mechanical structure adapted to cooperate with the blocking device; an image sensor (4) observing the ophthalmic lens (20); a control unit (10) connected to the image sensor (4) and configured to produce an image having a point of reference with a determined position with respect to the mechanical structure and at least part of the ophthalmic lens (20) including said marking; and a user interface (12) adapted to display a blocking device positional compensation proposal for an automatic positional compensation or for a manual positional compensation based on the comparison to a predetermined threshold of a distance between the point of reference and the marking on the image. A corresponding method and a method for edging an ophthalmic lens are also proposed.

Disclosed is a method implemented by a computer, for determining the position of an optical lens member having a surface placed on a lens blocking ring, the blocking ring including a bearing zone arranged to bear at least partially a placed known surface of the optical lens member when the known surface of the optical lens member is placed on the lens blocking ring and hold by a force applied on the optical lens member, the method includes finding a trio of points of the bearing zone that forms a triangle including the projection on the main plane of the point of application of the force; and a position of the optical lens having a virtual contact between the placed known surface and the ring at the location of the trios of points.

A method for producing an instruction for bevelling an ophthalmic lens, with a view to mounting same in a framework of a spectacle frame into which a bevelled display lens is initially fitted. The method includes the steps of: a) acquiring a correction parameter relative to the play between the framework and the display lens; b) capturing a surface image of the display lens previously removed from the framework; c) determining, on the surface image, an initial contour (C0) of the display lens; d) calculating a corrected contour (C1), by correcting the initial contour according to the correction parameter; and e) deriving the bevelling instruction according to the corrected contour.

Method of taping an optical lens member (10) to be manufactured. An optical lens member providing step (S1) is performed during which an optical lens member (10) is provided, the optical lens member has a first optical surface (11) associated with a first reference system and a second optical surface (12) to be manufactured, the first and second optical surfaces being connected by a external periphery surface (14), the first reference system being identified by at least one referencing element (111) on the first optical surface and/or the external periphery surface of the optical lens member, a taping step (S2) during which an adhesive tape (17) is provided on the first surface of the lens member so as to cover at least part of the first surface and leaving the referencing element uncovered.

Disclosed is a method for assisting a user in taping an adhesive label to a surface of an ophthalmic lens with an initial contour prior to edge grinding, the method including:holding of the ophthalmic lens with its initial contour by a holder,determining, from geometric data for the final contour of the ophthalmic lens to be produced, of a position of the final contour inside the initial contour of the ophthalmic lens,creating a visual aid for the user enabling the latter to apply the adhesive label to the ophthalmic lens with its initial contour prior to edge grinding, such that the adhesive label can be applied inside the final contour.