• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    The invention relates to a method for determining a trimming setpoint of an optical lens to be cut for mounting in an eyeglass frame (150) in which is mounted at least one optical reference lens (100), comprising a step of dismounting said reference optical lens, a step of fixing said optical reference lens dismounted on a support (10) of an image acquisition machine, a first acquisition step, by an image sensor of said image acquisition machine, at least a first image of said disassembled optical reference lens, - a processing step of each acquired first image to derive clipping parameters thereof optical lens to be cut off, and a step of producing said clipping instruction according to said clipping parameters. According to the invention, the method comprises, before or after said first acquisition step, a second step of acquisition by the image sensor of a second image of said reference optical lens mounted in the spectacle frame, and during said processing step, said clipping parameters are elaborated also according to said second image.
    公开号:FR3024246A1
    申请号:FR1457238
    申请日:2014-07-25
    公开日:2016-01-29
    发明作者:Vincent Anatole；Cedric Sileo
    申请人:Essilor International Compagnie Generale dOptique SA；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD TO WHICH THE INVENTION RELATES The present invention generally relates to the trimming of optical lenses for mounting in an eyeglass frame.
    [0002] It relates more particularly to a method of determining clipping parameters of an optical lens to be cut for mounting in a spectacle frame in which is already mounted a reference optical lens. BACKGROUND ART The technical part of the optician's profession involves mounting a pair of optical lenses on a spectacle frame selected by a wearer. This assembly is broken down into three main operations: - the acquisition of the geometry of the inner contour of one of the entourages of the selected eyeglass frame, - the centering of the lens in question, which consists of positioning and orienting this contour on the lens so that once mounted in its mount, this lens is correctly positioned relative to the corresponding eye of the wearer so that it can best perform the optical function for which it was designed, then - the clipping of the lens which consists in machining its contour to the desired shape. The trimming operation consists in eliminating the superfluous peripheral part of the optical lens concerned, in order to bring the outline, which is usually initially circular, to a contour of identical shape to that of the outline of the frame's surroundings. glasses or approximate shape. The quality of this clipping operation depends to a large extent on the accuracy of the operation of acquiring the shape of the outline of the entourage of the spectacle frame. Specifically, when the eyeglass frame is circled, this acquisition operation generally consists, for the optician, in palpating the inner contour of the entourage of the eyeglass frame selected to precisely determine the point coordinates characterizing the shape. the outline of this entourage. On the other hand, when the spectacle frame is semicircular or circle-free (the lenses being then pierced), a template is used (that is to say generally a reference lens supplied to the optician. with the spectacle frame) to determine the shape that the optical lens to be cut will have to present. An optical acquisition of an image of this template extracted from the frame 5 of glasses makes it possible to note the shape of the outline of this template as well as the position of any holes of this template. In this case, the only acquisition of a front image of the template does not allow to acquire all the data necessary to trim the optical lens.
    [0003] By way of example, it is not possible to identify in this image what are the constraints which are related to the thickness of the frame or to the position of the nose pads of the frame and which must be considered for the clipping. the optical lens (so that the latter can be mounted without difficulty and the first shot in the spectacle frame). It is understood that if the nasal plates of the spectacle frame are very close to the templates and the lens to be cut is thick, it will be necessary to cut the lens so that it does not bear against the nose pad. Moreover, except for using a telecentric lens, the acquisition of a front image of a template does not provide sufficient accuracy to acquire the shape of the outline of this template. Indeed, since the template is curved, the distance between the image sensor and the template varies from one point to another of the template, which generates scale variations from one point to the other of the template. 'picture. However, the use of a telecentric lens proves particularly expensive. Finally, since the holes are generally not oriented in the axis of the image sensor, it is difficult to precisely characterize their shape from the face image of the template. OBJECT OF THE INVENTION In order to overcome the aforementioned drawbacks of the state of the art, the present invention proposes a new optical method for acquiring the contour of the surrounding frame of glasses, usable whatever the type of the eyeglass frame. More particularly, there is provided according to the invention a method for determining clipping parameters of an optical lens to be cut for mounting in an eyeglass frame in which is mounted at least one optical reference lens, comprising: a step of dismounting said reference optical lens, a step of fixing said optical reference lens dismounted on a support of an image acquisition machine, a first acquisition step, by a sensor of images of said image acquisition machine, of at least a first image of said disassembled optical reference lens, - before or after said first acquisition step, a second acquisition step by the sensor of images of a second image of said optical reference lens mounted in the eyeglass frame, and - a step of processing each image acquired to derive detour parameters age of said optical lens to be cut. The clipping parameters can then be used to develop a clipping instruction of the optical lens to be cut.
    [0004] The reference optical lens is a lens that is initially in the spectacle frame. In practice, this will generally be a demonstration lens, which the optician will wish to replace with a lens to be cut, this lens to be cut out having for example optical powers adapted to the visual acuity of the future wearer of glasses.
    [0005] Thus, thanks to the invention, even in the case of rimmed eyeglass frames, the shape according to which it will be necessary to cut this lens from the image of the disassembled reference lens and the image of the lens is determined. reference mounted in his mount. The image of the disassembled reference lens will make it possible to record the shape of the contour of the reference lens. By superimposing the two images of the reference lens, disassembled and mounted in the frame, it will also be possible to determine additional trimming parameters related to the mounting constraints of the reference lens in its eyeglass frame.
    [0006] In one embodiment of the invention, these two images can be taken from the front by a non-telecentric lens. In addition, a side image of the reference lens will be taken. This image of the lens viewed from the side will then make it possible to determine the radius of curvature of the lens and thus to determine the distance at any point separating the lens from the non-telecentric objective (which will make it possible to scale the images of the lens seen from the front). This will provide results similar to those obtained with a telecentric lens, for a significantly lower cost. Alternatively, the radius of curvature of the lens can be read by the optician 5 on a label accompanying the lens to be cut, and entered manually by the optician, for example on a keyboard. Other advantageous and nonlimiting features of the method according to the invention are the following: during the first and second acquisition steps, said reference optical lens is fixed on said support in the same position; - The image sensor having a telecentric lens, during the processing step, said clipping parameters are directly measured or calculated on each acquired image; the image sensor comprising a non-telecentric objective, during the processing step, the curvature of one of the faces of said optical reference lens is acquired, each acquired image is scaled according to said curvature, and each clipping parameter is measured or calculated on the scaled images; during said first and / or said second acquisition step, the image sensor acquires at least two images of said reference optical lens viewed from two different angles; during said first and / or second acquisition step, the image sensor acquires a front image of said reference optical lens, in a position in which the reference optical lens extends into a mean plane substantially orthogonal to an axis of the optical path of said image sensor, and a side image of said reference optical lens, in a position in which the reference optical lens extends in a mean plane substantially parallel to an axis the optical path of said image sensor; In the processing step, the curvature of one of the faces of said reference optical lens is measured on said side image; said front and side images are successively acquired, a mirror being placed on the optical path of the image sensor between the two image acquisitions; During the production step, the two-dimensional shape of the contour of the optical reference lens is recorded on said front image of the disassembled optical reference lens; during said first and / or second acquisition step, said at least two images of said reference optical lens viewed from two different angles are acquired successively, by tilting, between the two image acquisitions, said optical reference lens with respect to the image sensor of a known angle about an axis of rotation which passes through the boxing center of the optical reference lens; During the preparation step, each drilling hole of the optical reference lens is searched, for each drilling hole found, the image is selected on which the contours of the outlets of the front and rear of said piercing hole; are closest, and at least one clipping parameter is assigned to characterize the shape and position of said pierce hole on the selected image. DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT The following description with reference to the accompanying drawings, given as non-limiting examples, will make it clear what the invention consists of and how it can be achieved.
    [0007] In the accompanying drawings: - Figure 1 is a schematic view of an image acquisition machine adapted to implement the method according to the invention; FIG. 2 is a diagrammatic sectional view of a set of three locking tips belonging to the image acquisition machine of FIG. 1; Figure 3 is a schematic perspective view of a locking glue adapted to be glued to a lens; FIG. 4 is a schematic perspective view of an alternative embodiment of the support of the image acquisition machine of FIG. 1; FIG. 5 is a schematic side view illustrating the acquisition of two images of a lens by means of the image acquisition machine of FIG. 1; FIG. 6 represents a front view image of an optical lens; FIG. 7 is a superimposition of two images of an optical lens viewed from the front with and without a spectacle frame of an optical lens; and FIG. 8 represents ten photographs of an optical lens viewed from five different angles, with and without spectacle frames. There are three main categories of eyeglass frames. There are thus rimmed eyeglass frames, semi5 rimmed eyeglass frames (also called arcaded frames) and circleless eyeglass frames (also known as pierced frames). Circled eyeglass frames conventionally comprise two surrounds which are intended to each accommodate a cut-away optical lens. These two surrounds are connected to each other by a trigger guard and each carry a branch. Each surround has a groove, commonly called a bezel, running along its inner face. When the eyeglass frame is circled, the optical lens must be cut off so as to present along its edge a nesting rib, commonly called a bevel, whose section generally has a V shape. The bevel thus formed on the The slice of the lens is then adapted to fit into the bezel of the rimmed frame. The semicircular spectacle frames comprise two arches on the inner faces of which ribs extend, as well as two holding wires which are connected to the ends of the arches to form closed contours therewith. When the eyeglass frame is semi-circled, the optical lens must be cut off so as to have a peripheral groove along its edge. The lens is then held in place in the eyeglass frame by fitting the upper portion of its wafer into the rib provided along the inner face of the corresponding arch, and engaging the holding wire in the groove. Finally, the frames of glasses without circle have two branches and a trigger guard, but are devoid of entourage or arcade. These branches and this bridge are on the other hand provided with lugs adapted to be inserted in drill holes previously made in the optical lenses. When the spectacle frame is without a circle, the optical lens must be cut in such a way as to have a section whose section is straight, then to be pierced so that the bridge and the corresponding branch of the eyeglass frame.
    [0008] 3024246 7 The job of the optician is to mount a pair of new lenses (referred to as "optical lenses to be trimmed") on the eyeglass frame selected by the wearer. It may be a new eyeglass frame, or a used eyeglass frame (where the eyeglass wearer wishes to change his optical lenses while retaining his eyeglass frame). In the case where it is new, the eyeglass frame is generally provided to the optician with presentation lenses (or templates) of zero powers and constant thicknesses.
    [0009] In the case where it is used, the spectacle frame is generally provided to the optician with optical lenses to be replaced. These optical lenses that are initially in the spectacle frame (new or used) will be in the rest of this description designated by the term "reference lenses".
    [0010] Before cutting out new optical lenses in order to replace these reference lenses, the optician must implement a contour acquisition operation according to which each new optical lens will have to be cut off. Here, this acquisition will be made according to the shape of the spectacle frame and depending on the shape of the reference lenses that are initially in the spectacle frame. In this way, the method used will apply to both rimmed eyeglass frames, semi-rimmed eyeglass frames and eyeglass frames. As shown in FIG. 1, an image acquisition machine 1 for acquiring images of a reference lens mounted in the spectacle frame will be used for this purpose (reference will be made hereinafter to " equipped reference lens ") or disassembled from it (hereinafter" bare reference lens "will be discussed). This image acquisition machine 1 will also make it possible to acquire these images of the reference lens, viewed from different angles.
    [0011] This image acquisition machine 1 comprises for this purpose: - a frame 2, - a support 10 for a reference lens, - a side of the support 10, a light source 20, - on one side or on the other side of the support 10, an image sensor 3024246 8 adapted to capture at least two images of the reference lens viewed from two different angles. To acquire two images of the reference lens from two different angles, it may be possible to mount the image sensor 30 so that it is movable relative to the frame 2 and / or to mount the reference lens on the support 10 so that it is movable relative to the frame 2. To allow to block the reference lens equipped on the support 10, the frame 2 will delimit around the support 10 a free space of sufficient size.
    [0012] In the embodiment of the image acquisition machine 1 shown in FIG. 1, the support 10 comprises a rod 11 whose free end is adapted to support a locking end, this locking end being provided for receive the reference lens. This rod 11 is here right. It extends along a main axis A3, which is in practice vertical. Here, this rod 11 is fixed to the support 2 by its low end. The light source 20 here comprises a direct lighting system 21, which makes it possible to illuminate the reference lens from below, that is to say the opposite of the image sensor 30 with respect to the lens .
    [0013] This direct lighting system 21 comprises a disk-shaped translucent plate, which is traversed at its center by the rod 11 in such a way that it extends all around the rod 11. Various light sources, such as Light-emitting diodes enable the translucent plate to be illuminated from below in such a way that it forms an extended light source. Alternatively, it may be provided to supplement or replace the direct lighting system 21 by a side lighting system (not shown) illuminating the reference lens by its edge. This lateral lighting system may be placed on the side of the rod 11, at the height of the top or bottom of the free end 30 of the rod 11, so as to illuminate the reference lens carried by the rod 11. image sensor 30 is itself formed by a digital camera. This digital camera could have a telecentric lens. The use of a telecentric lens would keep the same magnification ratio of the lens regardless of the shooting distance. Unfortunately, such an objective is very complex to manufacture. This is the reason why the objective chosen here is non-telecentric (it is therefore an entocentric objective).
    [0014] Here, it is then proposed, as will be well described hereinafter, to process the images acquired in such a way as to take account of the changes of scale due to the variations of the shooting distances, so as to obtain results as accurate as those obtained using a telecentric lens.
    [0015] The image sensor 30 is here mounted on the frame 2 in such a way that its optical axis A4 remains parallel to the main axis A3 of the rod 11 of the support 10. It is more precisely here mounted movably on the frame 2 of so that it can acquire not only a front image of the reference lens, but also a side image of this lens, without it being necessary for this to move the reference lens. For this, the image sensor 30 is mounted on the frame 2 with translational mobility along an axis A5 perpendicular to its optical axis A4. It is thus movable between a base position in which its optical axis A4 coincides with the main axis A3 of the rod 11, and a retracted position in which its optical axis A4 is strictly parallel to the main axis A3. There is further provided a mirror 70 which allows, when the image sensor 30 is in the retracted position, to reflect an image from the side of the reference lens to this image sensor 30.
    [0016] This mirror 70 extends for this purpose in a plane whose normal to the center of the mirror intersects the main axis A3 with an inclination angle of 45 degrees. This mirror 70 is thus positioned in such a way that, when the image sensor 30 is in the retracted position, the mirror 70 is in the field of the image sensor.
    [0017] As shown in FIG. 5, the mobility of the image sensor 30 and the use of the mirror 70 thus make it possible to acquire two images 100A, 100B of the reference lens 100, viewed from two different angles. These two images will be, in the remainder of this presentation, called front image 100A and side image 100B.
    [0018] In a variant, it is possible to provide that the image sensor remains stationary, and that the mirror is movable so as to be placed in the field of the image sensor so as to send back thereto an image of the side of the lens (via for example other mirrors).
    [0019] In the present invention, when the reference lens is pierced, it is desired to acquire at least one other image of the reference lens, viewed from another angle. Indeed, the only front and side views of the lens do not allow precise characterization of the shapes and positions of the holes provided in the reference lens. Here it will be specified that it may be through holes, allowing for example to fix the eyeglass frame to the lens (in the case of pierced frames), or non-through holes (opening on one side of the lens or on the edge of the lens). These non-through holes, sections 15 not necessarily circular, may for example have only an aesthetic function. To precisely characterize the shapes and positions of these holes, the present invention proposes to acquire other images, in which the holes are substantially located in the axis of the image sensor 30.
    [0020] In the remainder of this disclosure, it will be considered that these are through holes, opening on both sides of the lens. FIG. 3 shows a locking tassel 90. Such a locking tassel comprises a plate 91 coated with a double-sided sticker to be adhered to the lens. It also comprises a cylindrical pin 92 of revolution, which is provided to be easily grasped in order to facilitate the gripping of the lens. In this FIG. 3, it is observed that the peg 92 has a recessed groove 93 in its end face, which extends along the diameter of this peg and which provides an indication of the orientation of the lens around the peg. pin axis 92. As shown in Figure 2, the image acquisition machine 1 is then equipped with a set of at least two different locking tips. Three locking pieces 40, 50, 60 are provided here. Each locking piece 40, 50, 60 includes: a gripping part 41, 51, 61 for fixing it to the rod 11 along a first axis Ai, and 3024246 11 - a reception part 42, 52, 62 for its attachment to the locking tassel 90 along a second axis A2, the angle of inclination between the first axis A1 and the second axis A2 varying from a locking piece 40 , 50, 60 to another. Here, the gripping portions 41, 51, 61 of the three locking ends 40, 50, 60 are identical. They are designed to attach to the rod 11 by interlocking. They are then in the form of symmetrical sleeves of revolution about the first axis Al. These sleeves have identical inner diameters (with the mounting clearance) to the outer diameter of the rod 11, which gives them good stability on the free end of the rod 11.
    [0021] The receiving portions 42, 52, 62 of the three locking pieces 40, 50, 60 are in turn provided for attachment to the pin 92 of the locking pin 90. They each comprise for this purpose a cavity for accommodating the As shown in dashed lines in FIG. 2, the hollow recess in each receiving portion 42, 52, 62 is traversed by a rib which is adapted to fit in the groove 93 of the peg 92. this way, it is ensured that the orientation of the lens around the axis A3 of the rod 11 does not change when the lens is successively positioned on the three locking ends 40, 50, 60. Here, the faces The upper portions of these receiving portions 42, 52, 62 have identical shapes, but they are oriented differently from the gripping portions 41, 51, 61. The axis of symmetry of the receiving portion 42, 52, 62 of each endpiece (here called second axis A2) has an inclination relative to the first axis Al which differs from one tip to another.
    [0022] In the example shown in FIG. 2, the angle of inclination between the first axis A1 and the second axis A2 is equal to 0 degrees for the first locking piece 40, 30 degrees for the second locking piece 50. , and at 15 degrees for the third locking end 60. In this way, by successively fixing the reference lens to the rod 11 by means of these locking ends 40, 50, 60, it is possible to acquire images of the reference lens with different angles of inclination. By changing the locking tip, the risk is then to lose the referential of the reference lens between the different acquisitions of images. To avoid this, as shown in FIG. 2, the locking pieces 3024246 12 40, 50, 60 are made in such a way that the point of intersection between the first and second axes Ai, A2 is always at the same position by relative to the gripping portion 41, 51, 61 of the locking piece. In this way, by placing each time the boxing center of the reference lens 5 at this point of intersection, it is ensured that the referential of the reference lens is retained (this reference frame is then kept for the reference lens). machining of the lens). In the present case, this point of intersection will be situated at a given distance from the upper face of the reception part 42, 52, 62, this distance corresponding to the thickness of the plate 91 of the locking glans 90 and of the double-sided sticker used. As shown in FIG. 5, the boxing frame 110 of the reference lens 100 will be defined here as being the rectangle which circumscribes the contour 101 of the image 100A of the reference lens 100 seen from the front, and whose two sides 15 are parallel to the horizon line of the lens. We will then define the boxing center of the reference lens as the point which is located in the center of the boxing frame 110, on the front face of this reference lens 100. Here, the locking tips 40, 50, 60 will be manufactured either at the application, by means of a 3D printer or any other adapted technique (rapid prototyping, ...), or in series by molding a plastic material. According to a variant of the invention shown in FIG. 4, it will be possible to use one and the same locking piece 40 to fix the reference lens, in which case the support 10 will have to be mounted movably relative to the frame 2 so as to to be able to acquire inclined images of the reference lens. The support 10 will preferably be mounted mobile with respect to the frame 2 with at least two rotational mobilities around two distinct axes, and two translational mobilities along two distinct axes. In this variant, the rod 11 is not fixed to the frame 2 of the image acquisition machine 1, but it is mounted on the frame 2 with two rotational mobilities about two non-parallel axes A6, A7. This rod 11 is thus rotatably mounted about a first axis A6 which is perpendicular to the main axis A3 of the rod 11. This first axis A6 is in practice horizontal.
    [0023] The rod 11 is further rotatably mounted about a second axis A7 which is perpendicular to the first axis A6. This second axis A7 is in practice merged with the main axis A3. To give it these two mobilities, the rod 11 rises from a plate 12, which is rotatably mounted (around the main axis A3) on a base 13, this base 13 being itself mounted mobile in rotation (about the first axis A6) on a base 14 placed on the frame 2. Here, the base 14 has a U-shaped, with a flat bottom portion which rests on the frame 2, and two lateral uprights which are raised above the frame 2. The base 13 is then connected to this base 14 by two inverted V-shaped lateral arches, the ends of which are fixed to the base 13 and whose vertices bear pins mounted to pivot in two bearings smooth of the base 14.
    [0024] The mounting of the lugs in the plain bearings of the base 14 is tightened so that, on the one hand, the optician can manually tilt the base 13 around the first axis A6, and that, on the other hand, once tilted, the base 13 remains in an inclined position and does not return naturally to the initial position. The plate 12 for its part has a circular seat which rests on the upper face of the base 13. It is provided, recessed in the upper face of the base 13 and in the circular seat of the plate 12, annular grooves facing which allow to accommodate a guide ring of the rotation of the plate 12 around the main axis A3. In this way, by adjusting the angular position of the plate 12 about the main axis A3 and that of the base 13 about the first axis A6, it is possible to tilt the reference lens attached to the locking accessory 40 in place. a position inclined with respect to the optical axis A4 of the image sensor 30, in order to acquire inclined images of the reference lens. It is also possible to move the base 14 by sliding it on the frame 2, so as to be able to place the axis of the rod 11 in the optical axis A4 of the image sensor 30, or at a distance from that -this. Alternatively, it could be provided to use electric motors to automatically actuate the mobilities of the support 10 relative to the frame 2. Again, to avoid any problem of change of reference during the pivoting of the base 13 around the first axis A6 , the support 10 is designed such that the point of intersection of the first axis A6 and the main axis A3 is located at a given distance from the upper face of the receiving portion 42 of the locking accessory 40 this distance corresponding to the thickness of the plate 91 of the locking tassel 90 and the double-sided sticker used. Note also in Figure 4 that in this embodiment, the mirror 70 is attached to the end of one of the uprights of the base 14. In the photos 3, 5, 7 and 9 of Figure 8, has shown four inclined images of the bare reference lens 100, acquired with the aid of the image acquisition machine 1. In FIG. 1 of this FIG. 8, a front image of the lens of FIG. reference 100 nude. In the other photos, corresponding images of this reference lens 100 equipped (front, side and inclined view) are shown. In order to control the various members of the image acquisition machine 1, there is provided a computer (not shown) comprising a processor, a random access memory (RAM), a read-only memory (ROM), analog-digital converters, and different input and output interfaces. Thanks to its input interfaces, the computer is adapted to receive different human / machine interfaces (touch screen, button, ...) input signals relating to the will of the optician. The optician can thus control the lighting of the lighting source 20, the acquisition of an image by the image sensor 30, the processing of the images acquired, the starting of the electric motors, etc. its random access memory, the computer stores the various acquired images of the reference lens. In its read-only memory, the computer stores a software for processing acquired images, which makes it possible to generate clipping parameters for a new lens. Finally, thanks to its output interfaces, the computer is adapted to transmit these clipping parameters to at least one optical lens trimming machine. To elaborate a set of instructions for trimming a new lens, one then proceeds in several steps. The main steps of this method are as follows: a) a step of dismounting the reference lens 100 equipped (that is to say, mounted in the eyeglass frame 150) on the support 10 of the machine; acquisition of images 1, b) a step of acquisition, by the image sensor 30, of at least a first image of the reference lens 100 equipped, c) a step of disassembly of the reference lens 100 and fixing this bare reference lens 100 on the support 10 of the image acquisition machine 1, d) a step of acquisition, by the image sensor 30, of at least a second image of the reference lens 100 nue e) a step of processing the acquired images to derive clipping parameters of said new lens, and f) a step of developing the clipping instruction according to said clipping parameters.
    [0025] At this point, it will be specified that the clipping instruction is generally produced by the clipping machine itself, from different clipping parameters. Indeed, the clipping instruction will be developed according to the kinematics of the clipping machine concerned, so that it can not generally be developed upstream.
    [0026] The implementation of steps a) to e) of the above method can be described in detail. Step f), which is well known to those skilled in the art and which does not form the subject of the present invention, will not be described in detail here. It will be specified here that steps a) and b) can be implemented after steps c) and d), in which case it will be necessary to put the reference lens in the spectacle frame after disassembly. It will also be noted that steps b) and d) may include the acquisition of several images viewed from different angles. Here, during a first step (corresponding to step c), the optician 30 dismounts one of the two reference lenses 100 of the spectacle frame 150, so as to be able to acquire images of the lens of reference 100, on which appear the entire contour of this reference lens 100. Here, it will be considered that the optician has an image acquisition machine 1 comprising a support 10 of the type shown in FIG. figure 4.
    [0027] Of course, the implementation of the method would be substantially the same with a support 10 of the type shown in FIG. 1. After extracting the reference lens 100 from its mount, the optician fixes the locking pinch 90 on the reference lens 100 by means of a double-sided sticker, taking care that the axis of the pin 92 passes through the boxing center of the reference lens 100. Markings provided on the lens and on the tassel locking 90 to identify the boxing center and the axis of the pin 92 facilitate this operation. The optician can alternatively use a center-and-blocker device, the use of which is well-known elsewhere, and makes it possible to obtain more precise results. According to another variant, the optician could use a pneumatic locking tassel, which is in the form of a suction cup to report on the lens and to fix it to the latter by means of a vacuum pump.
    [0028] Here, the optician then reports the locking glue 90 provided with the reference lens 100 on the locking accessory 40 attached to the end of the rod 11. It then places the cradle 12 of the support 10 in an initial position. right (in which the main axis A3 of the rod 11 merges with the second axis A7).
    [0029] Then, the image acquisition machine 1 is ready to acquire images of the reference lens 100. In step b), the optician controls the acquisition of images of the reference lens 100, via any input means equipping the image acquisition machine 1 (keyboard, touch screen, etc.).
    [0030] In this step, the image sensor 30 is controlled to acquire a front image 100A of the reference lens 100 (see FIG. 5). The computer then controls the displacement of the image sensor 30 from its basic position to its retracted position, via for example a rack-and-pinion system controlled by an electric motor. The computer then controls the acquisition of a side image 100B of the reference lens 100. The computer then controls the return of the image sensor 30 to the base position. When the reference lens 100 has piercing holes, the optician then manually inclines the cradle 12 of the holder 10 such that one of the piercing holes is positioned substantially vertically. It then controls the acquisition of a new inclined image of the lens. It proceeds in the same way for all other drilling holes and for all non-through holes. Alternatively, when the inclination of the cradle is controlled by an electric motor, the tilt setpoint sent to the electric motor can be calculated automatically by the computer. It can in particular be calculated according to the shape of the drilling hole in the face image (in this face image, the hole has an oblong and non-circular shape). Indeed, it is possible to determine on this front image the orientation of the drilling hole, and to deduce a tilt setpoint to send to the electric motors. Thus, at this stage, if the reference lens 100 does not have a piercing hole, the computer's random access memory stores at least two images of the reference lens 100 viewed from the front (i.e. the front) and back view (ie seen from the back). On the other hand, if the reference lens 100 has, for example, four holes for drilling, the computer's random access memory stores six images of the reference lens 100.
    [0031] Once these images have been acquired, the optician raises the spectacle frame 150 onto the reference lens 100, while the latter is still mounted on the rod 11. As can be seen in FIG. 8, it can thus acquire other lenses. images of the reference lens 100 mounted in its eyeglass frame 150.
    [0032] In practice, the optician controls the acquisition of two other images: a front image and a side image of the reference lens 100 equipped (that is, mounted in its eyeglass frame 150). Finally, the optician commands the start of the processing of the images acquired by the computer.
    [0033] If the images were acquired using a non-telecentric lens, the first processing operation is to resize the stored images. Indeed, in this case, the distance between the objective and the reference lens 100 varies from one point to another of the lens, which generates a distortion of the acquired image that must be corrected. in order to obtain reliable measurement results. In the case where the objective used is telecentric, this first operation is useless. Here, this first operation then consists in correcting the coordinates of each characteristic point of the acquired image. The prerequisite of this operation is to determine the curvature of the reference lens 100, this curvature then making it possible to determine the distance separating the image sensor 30 from the reference lens 100, which will allow each image to be scaled up. .
    [0034] To determine this curvature, it is possible to acquire the radius of curvature of the convex front face of the reference lens 100 either by reading it in a database or by measuring it with a suitable apparatus and by entering manually on the keyboard, either by calculating it on the image of the profile lens.
    [0035] Indeed, as shown in FIG. 5, by detecting the shape of the contour of the reference lens viewed from the side, the calculator can determine the radius of curvature of the convex front face of the reference lens 100 (which is considered as having a spherical cap shape). Then, in order to understand how the computer performs the operation of scaling the acquired images, we can look at a point P that can be identified on the face image 100A and on the side image 100B of the image. 100 reference lens naked (see Figure 5). We then seek to determine the three-dimensional coordinates Xmm, Y ', Zmm of this point P, expressed in millimeters, whereas only the two-dimensional coordinates (Xzi, Yzi) and (Xz2, Zz2) of this point P are available, measured in pixels on the two images 100A, 100B. We can write the system of six equations: Xmm = Xz1 * Sz1, with Sz1 the height of the point P with respect to the boxing center (which is deduced from the curvature of the lens), 30 Ymm = Yzi Sz1 = a * Zmm + So, a and So being two known constants (determined during the calibration of the image acquisition machine 1), Xmm = Xz2 * Sz2, with Sz2 the horizontal distance between the point P and the boxing center (which is deduced from the curvature of the lens), Z2 = Zz2 * SZ2, Sz2 = a * (Ymm - (L1 + L2)) + So, L1 and L2 are two known constants (determined during the calibration of the machine). acquisition of images 1). In practice, only the result of solving this equation system is stored in the computer's ROM. This result is the following: Ymm = [1 / (1 - Yi * * a2 * Zz2)] * [Yzi * So * (1 + a * Zz2) - Yzi * a2 * Zz2 * (_ 1 + L2)] Zmm = Zz2 * (a * (Ymm - (L1 + L2)) + So) "mm = Xi * * (a * Zmm + So) By applying this result to all the characteristic points of the image, the calculator can then resize the images acquired so as to obtain undistorted results despite the use of a non-telecentric lens Once the acquired images have been resized, the second operation consists in processing the images of the naked reference lens 100. The first image processed is the front view image 100A.
    [0036] For example, FIG. 6 shows such a front view image 100A, acquired by the image sensor 30 and resized by the computer. In order to obtain clipping parameters to be transmitted to a trimming machine, the computer will examine the contour 101 of the front view image 100A of the reference lens 100, it will determine the zone or zones of the lens 20 which will be covered by the eyeglass frame, and it will characterize the hole or holes provided in the reference lens 100. In the front view image 100A, the contour 101 of the reference lens 100 has convex zones and two concave areas located. This outline 101 is then characterized by a plurality of points which extend along its periphery, and which are regularly distributed thereon. The two-dimensional coordinates of these points will form first trimming parameters to be transmitted to the trimming machine. The computer will then process in combination the images viewed from the front of the reference lens 100 and the reference lens 100 equipped (see 30 views 1 and 2 of Figure 8). It may optionally process in combination the images viewed from the side of the reference lens 100 equipped with the reference lens 100 naked. It will thus be possible to determine the zone situated inside the contour 101 which corresponds to the zone of the reference lens 100 which is covered by the spectacle frame 150. This zone 105 is represented in FIG. by locating the position of the contour of the eyeglass frame 150, the computer will postpone this contour on the front view image 100A of the bare reference lens 100, and thus characterize this zone 105.
    [0037] It will thus be possible to determine the zone or zones of conflict situated inside the zone 105 which correspond to the places where the new lens may interfere with the eyeglass frame 150 and to create collisions for example with the nasal platelets or the front and / or rear edges of the frame. Indeed, unlike the reference lens 100 which generally has a reduced thickness, the new lens may have a large thickness at the edge. This is the reason why it is not because the reference lens 100 does not interfere with the spectacle frame 150 that it will be the same with the new lens. By determining the three-dimensional shape of a portion of the eyeglass frame 150 using the acquired front and side images, or by determining the positions of the mount points likely to interfere with the new lens, the calculator will then be able to determine if such a conflict may occur, given the shape of the new lens. If such a conflict is detected, the calculator will be able to determine second clipping parameters, aiming to create an inclined bevel in the areas of conflict with the nose pads and / or to allow machining a shoulder (or recess) in the slice of the new lens as specified in US7643899. Such machining will thus make it possible to avoid any problem of mounting the new lens in the spectacle frame 150.
    [0038] The computer will then process the front view image 100A of the naked ophthalmic lens 100 to determine if this lens has one or more through holes or non-through hole. If a drilling hole is detected, the computer will select, among the different acquired images of the bare reference lens, the one on which the contours of the front and rear outlets of the drilling hole considered are the closest. This image will correspond to that for which the drilling hole was oriented substantially in the axis of the image sensor 30. In a variant, this selection may be operated visually by the optician. It is then on this image that the computer 100 will calculate the shape and the position of this drilling hole. The shape and position of each piercing hole will form third clipping parameters. The clipping of the new lens can then be operated by blocking the new lens not yet cut out with the aid of the locking accessory 40, in order to keep the same reference frame.
    权利要求:
    Claims (11)
    [0001]
    REVENDICATIONS1. A method of determining clipping parameters of an optical lens to be cut for mounting in an eyeglass frame (150) in which at least one optical reference lens (100) is mounted, comprising: - a step of fixing said reference optical lens (100) on a medium (10) of an image acquisition machine (1), - a first acquisition step, by an image sensor (30) of said image machine acquiring images (1), at least a first image of said optical reference lens (100) removed from the spectacle frame (150), and - a processing step of each first acquired image to derive parameters therefrom of clipping said optical lens to be cut out, characterized in that it comprises, before or after said first acquisition step, a second step of acquisition by the image sensor (30) of a second image of said lens optical reference (100) mounted in the eyeglass frame (150), and in that during said processing step, at least a portion of said clipping parameters are also produced in accordance with said second image.
    [0002]
    2. Determination method according to claim 1, wherein, during the first and second acquisition steps, said reference optical lens (100) is fixed on said support (10) in the same position.
    [0003]
    3. A method of determination according to one of claims 1 and 2, wherein the image sensor (30) having a telecentric lens, during the processing step, said clipping parameters are directly measured or calculated on each image acquired.
    [0004]
    4. A method of determining according to one of claims 1 and 2, wherein the image sensor (30) having a non-telecentric lens, during the processing step, acquires the curvature of one of the faces of said reference optical lens (100), each acquired image is scaled according to said curvature, and each clipping parameter is measured or calculated on the scaled images.
    [0005]
    5. Determination method according to one of claims 1 to 4, in which, during said first and / or second acquisition step, the image sensor (30) acquires at least two images of said reference optical lens (100) viewed from two different angles.
    [0006]
    6. A method of determination according to claim 5, wherein, during said first and / or said second acquisition step, the image sensor (30) acquires: a front image of said optical lens of reference (100), in a position in which the reference optical lens extends in a mean plane substantially orthogonal to an axis of the optical path of said image sensor (30), and - a side image of said optical lens reference plane (100), in a position in which the reference optical lens (100) extends in an average plane substantially parallel to an axis of the optical path of said image sensor (30). 15
    [0007]
    7. A method of determination according to claims 4 and 6, wherein, in the processing step, the curvature of one of the faces of said reference optical lens (100) is measured on said side image.
    [0008]
    8. Determination method according to one of claims 6 and 7, wherein said front and side images are acquired successively, a mirror (70) being placed on the optical path of the image sensor (30) between the two image acquisitions.
    [0009]
    9. Determination method according to one of claims 6 to 8, wherein, during the development step, is taken on said face image of the optical lens (100) dismounted the two-dimensional shape of the contour (101) of the reference optical lens (100).
    [0010]
    10. Determination method according to one of claims 5 to 9, wherein, during said first and / or second acquisition step, said at least two images of said optical reference lens (100) seen under two different angles are successively acquired, by tilting, between the two image acquisitions, said reference optical lens (100) with respect to the image sensor (30) by a known angle around a rotating axis which passes by the boxing center of the optical reference lens (100).
    [0011]
    11. Determination method according to one of claims 5 to 10, wherein, during the development step: - each search hole is searched for the reference optical lens (100), - for each drilling hole found, the image is selected on which the contours of the outlets front and rear of said piercing hole are closest, and - at least one clipping parameter is assigned to the characterization of the shape and position of said Drill hole on the selected image.
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    同族专利:
    公开号 | 公开日
    US10148858B2|2018-12-04|
    CN105278124A|2016-01-27|
    EP3172010B1|2018-05-09|
    CA2956030A1|2016-01-28|
    EP3172010A1|2017-05-31|
    FR3024246B1|2016-08-05|
    WO2016012721A1|2016-01-28|
    CN105278124B|2018-06-22|
    US20170208229A1|2017-07-20|
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    法律状态:
    2015-07-17| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-29| PLSC| Search report ready|Effective date: 20160129 |
    2016-07-26| PLFP| Fee payment|Year of fee payment: 3 |
    2017-07-26| PLFP| Fee payment|Year of fee payment: 4 |
    2018-07-06| TP| Transmission of property|Owner name: ESSILOR INTERNATIONAL, FR Effective date: 20180601 |
    2018-07-26| PLFP| Fee payment|Year of fee payment: 5 |
    2020-04-10| ST| Notification of lapse|Effective date: 20200306 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1457238A|FR3024246B1|2014-07-25|2014-07-25|METHOD FOR PRODUCING A DETOURING SETTING OF AN OPTICAL LENS|FR1457238A| FR3024246B1|2014-07-25|2014-07-25|METHOD FOR PRODUCING A DETOURING SETTING OF AN OPTICAL LENS|
    CA2956030A| CA2956030A1|2014-07-25|2015-07-23|Method for working out settings for edging an optical lens|
    US15/328,506| US10148858B2|2014-07-25|2015-07-23|Method of defining a guideline for trimming an optical lens|
    CN201510437108.1A| CN105278124B|2014-07-25|2015-07-23|It limits for the method for the leading line to optical mirror slip progress deburring|
    PCT/FR2015/052033| WO2016012721A1|2014-07-25|2015-07-23|Method for working out settings for edging an optical lens|
    EP15751055.3A| EP3172010B1|2014-07-25|2015-07-23|Method for working out settings for edging an optical lens|
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