Abstract:
PROBLEM TO BE SOLVED: To provide a method to effectively read out the cross section of the groove edge of the edge section of a spectacle frame and a pointer to carry out this method. SOLUTION: In the method to read out the cross section of the groove edge 10 of the edge section 11 of a spectacle frame at least at one point above the edge section 11, with the position of a movable pointer 12 left capable of being defined using a specified coordinate system RT, the movable pointer 12 is moved following the groove edge 10. At least two different points on at least one side face 13 or 13' out of the side faces 13 and 13' of the groove edge 10 are visually confirmed in order to obtain the coordinate value of these points. The cross section of the groove edge 10 thus read out is used for trimming the lens to be secured in this groove edge 10.
Abstract:
The invention concerns a device for applying to one side of a lens a coating film (63) that has been pre-deposited on the side of the lens in question, said device comprising a seat (40) capable of receiving the lens, a membrane (62) comprising a peripheral retaining part (62A) and an inflatable part (62B), and means (61) for inflating the membrane in the direction of the lens seat. According to the invention, the inflating means comprise a first plate (66) and a second plate (65) between which the membrane is placed, the first plate having a recessed pressurization chamber (80) connected to a source of compressed gas (93) and the second plate having a protruding opening (71), both plates being mounted so as to be movable relative to each other between an open configuration and a closed configuration.
Abstract:
The invention relates to a method for determining, in a natural posture, at least one geometric/physiognomic parameter associated with the mounting of an ophthalmic lens in a spectacle frame intended to be worn by a wearer. The method comprises the following steps consisting in: (a) capturing at least one substantially frontal image of the wearer's head; (b) determining a measured value of an angle of inclination (A) during the capture of the substantially frontal image, which depends on the inclination of the wearer's head about a main axis perpendicular to a sagittal plane of the wearer's head; (c) determining a reference value of said angle of inclination corresponding to a natural posture of the wearer's head (10); and (d) determining the required geometric/physiognomic parameter on the basis of the substantially frontal image captured and as a function of the difference between the measured value of the angle of inclination determined in step (b) and the reference value of the angle of inclination determined in step (c).
Abstract:
The present invention relates to a method and an apparatus for applying a film of coating (63) to one face (108) of an optical element (100), comprising the depositing of the coating on the face of the lens, an adhesive interface (46) being disposed between the coating and the lens, and the inflating of a membrane (62) toward the lens to flatten the coating against the lens. According to the invention, the adjustment is provided of the position of the lens with respect to the membrane, said adjustment being distinct from the inflation of the membrane.
Abstract:
The present invention relates to a method and an apparatus for applying a film of coating (63) to one face (108) of an optical element (100), comprising the depositing of the coating on the face of the lens, an adhesive interface (46) being disposed between the coating and the lens, and the inflating of a membrane (62) toward the lens to flatten the coating against the lens. According to the invention, the adjustment is provided of the position of the lens with respect to the membrane, said adjustment being distinct from the inflation of the membrane.
Abstract:
The invention relates to a method for fitting an actual predetermined glasses frame (10), selected by a given wearer, for the use thereof by said wearer. Said method comprises the following steps: b) the head (TS) of the wearer is at least partially modelled, in at least one reference system, with at least one model (MN) of part of the nose (N) and one model (MORD, MORG) of part of the ears (ORD, ORG); c) simulating the positioning of the frame (10) on the head (TS) of the wearer is carried out, in the model of the head (TS) of the wearer, by placing the corresponding areas of said frame (10), or a model of the latter, one over the other; and d) on the basis of placing these one over the other, the necessary change in shape of the actual predetermined frame (10) is determined in order to achieve a fitting of said frame (10) on the head (TS) of the wearer in accordance with at least one predetermined fitting criterion.
Abstract:
The invention concerns a method for calibrating an ophthalmic lens bevelling device comprising a machining tool provided with a bevelling groove. The invention is characterized in that the method includes the following steps: positioning, in a measuring plane comprising the locking axis of the shafts locking the ophthalmic lens and the axis of rotation of the machining tool, the locking axis at a known distance for plotting a first mean gauging segment defined as being the segment parallel to the axis of rotation of the machining tool whereof the ends are two points each belonging to a lateral surface of the bevelling groove and which are separated by a distance corresponding to a first given characteristic supporting width; measuring in said configuration a first calibrating position of the locking axis relative to the axis of rotation of the machining tool; and deducing therefrom the calibration constant.
Abstract:
The invention relates to a contour reading method for an item such as an eyewire for spectacles, said method using an appliance comprising a support for holding the item, and a rotary platform which is mounted in such a way that it rotates in relation to the support about a rotational axis and carries a reading sub-set provided with a sensor (8) consisting of a finger (9) and a rod (12), said finger (9) having a distal end. According to the inventive method, the distal end is displaced along the contour and successive positions thereof are detected. Said method is characterised in that the displacement step comprises a measuring step wherein the effort exerted between the platform and the rod (12) is measured parallel to the rod, and a control step wherein the distance between the finger (9) and the platform is controlled according to the effort in such a way that the intensity of the effort remains lower than a pre-determined threshold.
Abstract:
The invention relates to a method for determining at least one characteristic relating to the posture of the head (10) of a person (1) wearing spectacles (100) comprising a frame (110) and two lenses (150G, 150D), using a determining device comprising an image sensor, at least one light source and a computation unit. According to the invention, the method comprises steps of: a) acquiring an image (301) of at least part of the wearer's head, in which the spectacles are illuminated by the light source; b) in the image, locating reflections (160D, 160G, 161D, 161G) from the light source, reflected by the two lenses of the spectacles; and c) deducing the wearer's head posture characteristic in relation to the image sensor, as a function of the position of the reflections in the image.
Abstract:
The invention relates to a visual device including an ophthalmic lens (20) having an edge (23) provided with an insertion rib (24). The invention also relates to a method for making such a device. According to the invention, the insertion rib includes at least fifteen alternating bearing sections (50) and as many singular freedom sections (51), wherein the singular freedom sections (51) are narrower in width and/or height by at least 0.05 millimetre relative to said bearing sections (Sa).