Abstract: This method, which allows acquisition and computation of geometrical data of at least one pattern associated with an ophthalmic object (6) for manufacturing ophthalmic lenses similar to the object or complementary thereto, is of the type in which a device (12) for acquiring and computing geometrical data is used, which comprises: a transparent support (13) adapted for bearing an ophthalmic object; on one side of the support, means (17) for illuminating this support; on the other side of the support, a video camera (25) adapted for producing a video signal representative of at least one pattern associated with the ophthalmic object laid on the support; and signal processing and analysis means (27) receiving at the input the video signal produced by the camera, and adapted for computing and providing the geometrical data.

Abstract: This data acquisition and measuring device for acquisition and measurement of geometric data for at least one motif associated with a glass for a spectacle frame, for the manufacture of ophthalmic lenses, similar or complementary to the glass, comprises a support capable of holding the glass, an illuminator for illuminating this support, a video imaging system for capturing images oriented towards the support and capable of capturing at least two images of the contour of the glass placed on the support, and a signal analyzer and processor that receive at the input each image captured by the video imaging system. The analyzer and processor is capable of measuring the distance from at least one point of the form contour of the glass to a reference plane based on said images.

Abstract: This machine includes a base frame (17) and a lens support (19) mounted on the frame (17) with the lens support (19) having elements (29A, 29B) for driving a lens (15) into rotation around a first axis. It includes a tool holder set (21) including a rotary shaft (39) around a second axis (C-C?) and elements (43) for inclining the first axis (A-A?) with respect to the second axis (C-C?). The rotary shaft (39) bears at least two tools (49, 51) for machining the lens, spaced out along the second axis (C-C?), and a spacer (50) positioned in an intermediate area (55) located between both machining tools (49, 51). The spacer (50) defines an outer surface (57) for machining the lens.

Abstract: This data acquisition and measuring device for acquisition and measurement of geometric data for at least one motif associated with a glass for a spectacle frame, for the manufacture of ophthalmic lenses, similar or complementary to the glass, comprises a support capable of holding the glass, an illuminator for illuminating this support, a video imaging system for capturing images oriented towards the support and capable of capturing at least two images of the contour of the glass placed on the support, and a signal analyzer and processor that receive at the input each image captured by the video imaging system. The analyzer and processor is capable of measuring the distance from at least one point of the form contour of the glass to a reference plane based on said images.

Abstract: This method, which allows acquisition and computation of geometrical data of at least one pattern associated with an ophthalmic object (6) for manufacturing ophthalmic lenses similar to the object or complementary thereto, is of the type in which a device (12) for acquiring and computing geometrical data is used, which comprises: a transparent support (13) adapted for bearing an ophthalmic object; on one side of the support, means (17) for illuminating this support; on the other side of the support, a video camera (25) adapted for producing a video signal representative of at least one pattern associated with the ophthalmic object laid on the support; and signal processing and analysis means (27) receiving at the input the video signal produced by the camera, and adapted for computing and providing the geometrical data.

Abstract: This machine includes a base frame (17) and a lens support (19) mounted on the frame (17) with the lens support (19) having elements (29A, 29B) for driving a lens (15) into rotation around a first axis. It includes a tool holder set (21) including a rotary shaft (39) around a second axis (C-C?) and elements (43) for inclining the first axis (A-A?) with respect to the second axis (C-C?). The rotary shaft (39) bears at least two tools (49, 51) for machining the lens, spaced out along the second axis (C-C?), and a spacer (50) positioned in an intermediate area (55) located between both machining tools (49, 51). The spacer (50) defines an outer surface (57) for machining the lens.

Abstract: The apparatus (10) comprises a turret (50), rotatable about a first axis (B-B?), a slide (52) mounted on the turret (50) and a sensor (30) mounted for sliding in the slide (52) along a third axis (C-C?) substantially parallel to the first axis (B-B?). It comprises means (34) for displacement of the sensor for displacing a contact surface (42) of the sensor along the mount (14) during the sensing of the mount. The displacement means (34) comprise means (70) for driving the turret (50) in rotation about the first axis (B-B?). The apparatus comprises control means (82) for controlling means (72) for displacement of the turret in a plane perpendicular to the first axis (B-B?) and suitable for displacing the turret (50) in said plane when the turret is driven in rotation about the first axis (B-B?) during the sensing of the mount.

Abstract: The invention relates to a method of calibrating an ophthalmic-lens-piercing machine, a device used to implement one such method and a ophthalmic-lens-machining apparatus comprising one such device. The inventive method applies to a machine including a piercing tool, a lens support which is associated with a first reference mark (O1, X1, Y1), and programmable tool-control means which are associated with a second reference mark expressing set co-ordinates which define a target piercing point (M). A template is placed on the support, and the template includes pre-applied markings defining a third reference mark (O3, X3, Y3), such that the third reference mark in essentially in line with the first reference mark. The template is pierced at a pre-determined point corresponding to a target point, and an image of the template this point position, and a correction is applied to the set co-ordinates that can compensate for the misalignment.

Abstract: The apparatus (10) comprises a turret (50), rotatable about a first axis (B-B?), a slide (52) mounted on the turret (50) and a sensor (30) mounted for sliding in the slide (52) along a third axis (C-C?) substantially parallel to the first axis (B-B?). It comprises means (34) for displacement of the sensor for displacing a contact surface (42) of the sensor along the mount (14) during the sensing of the mount. The displacement means (34) comprise means (70) for driving the turret (50) in rotation about the first axis (B-B?). The apparatus comprises control means (82) for controlling means (72) for displacement of the turret in a plane perpendicular to the first axis (B-B?) and suitable for displacing the turret (50) in said plane when the turret is driven in rotation about the first axis (B-B?) during the sensing of the mount.

Abstract: The invention relates to a method of calibrating an ophthalmic-lens-piercing machine, a device used to implement one such method and an ophthalmic-lens-machining apparatus comprising one such device. The inventive method applies to a machine comprising a piercing tool, a lens support which is associated with a first reference mark (O1, X1, Y1), and programmable tool-control means which are associated with a second reference mark expressing set co-ordinates which define a target piercing point (M).

Abstract: The invention relates to a method for estimating the angular offset between a rotating radial axis linked to a glass which is to be ground and a reference rotating radial axis which can be applied to a grinding machine for ophthalmic glasses. Said method comprises the following steps: a glass-calibrator is ground, whereby a radial axis linked to the glass is previously made by tracing according to a control rule corresponding to the form of the theoretical finished glass-calibrator whereby the theoretical inclination thereof is known for a reference part of the contour thereof in relation to said radial reference axis; said image (31AI, YI) is analyzed in order to measure the real inclination (I) of the image (33AI) of the reference part (33A) in relation to the image (YI) of the pattern; the angular offset is calculated. The invention also relates to the use of said estimation method in order to calibrate the grinder. and to a device for carrying out said calibration method.

Abstract: The invention relates to a method for estimating the angular offset between a rotating radial axis linked to a glass which is to be ground and a reference rotating radial axis which can be applied to a grinding machine for ophthalmic glasses. Said method comprises the following steps: a glass-calibrator is ground, whereby a radial axis linked to the glass is previously made by tracing according to a control rule corresponding to the form of the theoretical finished glass-calibrator whereby the theoretical inclination thereof is known for a reference part of the contour thereof in relation to said radial reference axis; said image (31AI, YI) is analyzed in order to measure the real inclination (I) of the image (33AI) of the reference part (33A) in relation to the image (YI) of the pattern; the angular offset is calculated. The invention also relates to the use of said estimation method in order to calibrate the grinder. and to a device for carrying out said calibration method.

Abstract: This tracing apparatus (11) comprises two tracers (18, 27), which comprise a fine tracer (18), which is brought to bear against the bottom of the bezel of a frame ring (1) and which executes a revolution around the said frame ring in order to determine its form in space, and a second tracer (27), the profile of which matches that of the groove of the bevelling wheel. The difference in penetration of the pointed tips of the two tracers at the same point on the periphery of the bezel is measured in this way, and the corresponding information is sent to the grinding machine in order to control the glass-carrying carriage.

Abstract: An image processing station 18 displays data indicative of a plurality of document on a monitor 22 from data stored in a main image store 16 and the image processor 18 accepts commands from a keyboard 26 to print the images or to retrieve a new document from the main store 16 or a video memory 50 which comprises selectable first 56 and second 62 page portions either of which may be loaded with fresh image data while the other page portion is being displayed and documents are swapped from one page to the other when fresh document images are moved into one of the pages.