Method for positioning spectacle lenses relative to a spectacle frame and hole ring marking

Abstract

For positioning reference points of corrective spectacle lenses (5 R , 5 L ) relative to a lens frame (4) of a spectacle frame (3), raw spectacle lenses with a known reference point position (BP R , BP L ) into the lens frame (4). These reference point positions (BP R , BP L ) are marked with two intersecting lens reference lines. A hole ring marking with at least two radial hole ring reference lines is applied in such a way that the hole ring reference lines are aligned with the lens reference lines. After the spectacle frame has been adjusted to a wearing position adapted to the wearer, the hole ring marking is used as a sighting aid when measuring the extent to which the two raw spectacle lenses have a respective zero viewing direction (NBR R , NBR L) passes through the respective reference point position. As a result of the sight measurement, a target reference point position is determined, which corresponds to the respective actual zero viewing direction through the raw spectacle lens in both the horizontal and vertical directions. Optical spectacle lenses (5 R , 5 L ) whose reference point position corresponds to the target reference point position (BP R , BP L ) and the optical lenses (5 R , 5 L ) are fitted into the lens frame (4) of the spectacle frame (3). The hole ring marker has a marking ring on which the hole ring reference lines are applied. This results in an improved reference point positioning method.

Description

The invention relates to a method for positioning reference points of corrective optical spectacle lenses relative to a lens frame of a spectacle frame. The invention further relates to a perforated ring marking for application to a spectacle lens for carrying out such a method.To adapt the position of spectacle lenses relative to a spectacle frame to the requirements of a spectacle user, the so-called Victorin method is known. DE 10 2013 010 684 B4 discloses a method and a measuring device for detecting frame parameters of a spectacle frame and a supporting lens. DE 26 44 460 A1 discloses a device for carrying out ophthalmological measurements directly on spectacle frames and a method for determining ophthalmological data for in-glazing spectacle frames. DE 28 51 622 A1 discloses a method and an apparatus for carrying out ophthalmic measurements. DE 30 43 668 A1 discloses a measuring and centering device.It is an object of the present invention to adapt and improve a method for positioning eyeglass lenses relative to an eyeglass frame and thereby for adaptation to the requirements of an eyeglass user to the requirements of the eyeglass lenses, in particular to the requirements of progressive-vision eyeglass lenses.This object is achieved according to the invention by a positioning method having the features specified in claim 1.The reference points to be positioned can be, in particular, centering points of the spectacle lenses in the imaging of furthermore objects. A reference line angle between two radial hole ring reference lines may be 90°. The perforated ring mark used in the positioning method may have three or four or even more perforated ring reference lines. At the beginning of the positioning method, the perforated ring marking specifies a reference point position of the respective raw spectacle lens, which was measured, for example, in advance by using a so-called video centering method. During the measurement, a setpoint reference point position is detected by using the perforated ring marking as a sighting aid, namely the actual zero-view direction of the spectacle user measured during sighting. This measured actual zero-view direction regularly does not run through the original reference point position of the respective raw spectacle lens. The actual zero-view direction can be measured for both raw spectacle lenses. This measurement can be carried out including a determination of a distance of the two reference point positions. Deviations between an original reference point position on the respective raw spectacle lens, which was marked at the beginning of the method, and a corrected target reference point position resulting within the scope of the measuring method are securely detected with the aid of the positioning method, so that in particular progressive-vision optical spectacle lenses can be produced, the reference points of which coincide to the desired extent with the zero-view direction of the spectacle user. The determination of the setpoint reference point position as a result of the sighting measurement can be carried out iteratively, i.e. by way of a plurality of sighting measurement steps, in which the setpoint reference point position is adjusted more and more closely to that zero viewing direction which provides the most wearing comfort for the spectacle user.The spectacle lenses whose reference points can be positioned with the aid of the method can be individualized single-vision lenses which do not necessarily have a progressive vision capability but are adapted to the zero-vision direction of the spectacle user. Alternatively, the spectacle lenses whose reference points can be positioned with the methods can be progressive spectacle lenses. These may also include so-called office glasses, which are also referred to as room progressive lenses and which are to be adapted to the zero-view direction according to the manufacturer's requirement.The measurement can be carried out with the aid of video centering aids in particular.The measurement can be carried out with the aid of an optical sensor system, in particular for determining a viewing direction of the user of the eyeglasses.Marking according to claim 2 prevents the original marking of the reference point positions on the respective raw spectacle lens from disturbing during the measurement. As marking medium, a soluble ink, in particular a water-soluble ink or else ink soluble by using another solvent, can be used.An inner hole edge marked according to claim 3 can facilitate sighting and can in particular secure a starting position of the hole ring marking after repositioning of the respective hole ring marking during a sighting measurement step of the positioning method.A dynamic measurement according to claim 4 allows a realistic reference point position determination. The spectacle user then sees through the spectacles during dynamic measurement in the manner in which he also does in reality. Undesirable deviations due to an artistic head posture of the user of the eyeglasses are avoided. The measurement process can be carried out in particular during walking of the user.A method according to claim 5 enables an in particular iterative approach of a center of the respective perforated ring to an actual zero-view direction of the spectacle user.A perforated ring marking according to claim 6 serves to carry out a method of the type mentioned at the beginning.The radially extending ring-of-hole reference lines enable a precise application of the respective ring-of-hole marking such that a center of the ring-of-hole marking exactly corresponds to a predetermined reference point on the spectacle lens.The reference line angle may be 90°. Alternatively, a reference line angle between two of the perforated ring reference lines of the perforated ring marking can be 60°, 45° or else 30°. This allows requirements for coordinate directions to be measured to be taken into account.Four perforated ring reference lines according to claim 7 have proven to be practical. A different number of perforated ring reference lines, in particular in the range between three and eight, is also possible.Ring-of-hole reference lines aligned with one another according to Claims 8 or 9 facilitate positioning of a center of the marking ring of the ring-of-hole marking.A marking ring according to claim 10 can be easily positioned on the raw eyeglass lens. The marking ring can be designed in particular to be self-adhesive. The marking ring can also be fixed in another manner relative to the raw spectacle lens, for example using electrostatic attraction or also using magnetic attraction.Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. In these show: FIG. 1 schematically shows a pair of spectacles worn by a user of a spectacle with progressive-vision optical spectacle lenses worn by a spectacle frame, the actual reference point positions of which coincide with reference point positions through which a zero-view direction runs in each case, horizontal distance parameters Z and vertical distance parameters Y of the position of these reference point positions being illustrated; FIGS. 2 to 6 show instantaneous situations for illustrating steps of a method for positioning the reference points of the progressive spectacle lenses relative to the frame of a variant of the spectacle frame; and FIG. 7 is an enlarged plan view of a ring-of-holes mark for application to a eyeglass lens for performing the reference point positioning method.FIG. 1 schematically shows a pair of eyeglasses 1 worn by a user 2, of which a right eye 2 R and a left eye 2 L are illustrated. The terms "R" and "L" refer to the perspective of the user of the eyeglasses which is opposite to the perspective of the viewer.The eyeglasses 1 have an eyeglass frame 3 with a lens frame 4 and two progressive-view optical eyeglass lenses 5 R, 5L. carried thereby. The progressive power lenses 5 R, 5L are examples of eyeglass lenses that can be positioned relative to the lens frame 4 by a method described below. Instead of progressive-vision spectacle lenses, individualized single-vision lenses or else room progressive-vision lenses can also be positioned with the method. Optical material of the spectacle lenses can be plastic or glass. The spectacle lenses 5 R, 5L have optical reference points predetermined by their section, which, when the spectacle frame worn by the spectacle user is correctly seated, coincide with penetration points of the zero-viewing directions NBR R, NBR L of his two eyes 2 R, 2L thereof. The optical reference points are in particular centering points or the position of optical axes of sections of the spectacle lenses 5 R, 5L for a far vision. In this correct fit, the points of intersection of the zero-view directions NBR R, NBR L through the eyeglass lenses 5 R, 5L coincide with the reference points BP R, BP L both in the horizontal direction z and in the vertical direction y.The position of the zero-view directions or the reference points in a yz-coordinate system of the spectacle user can be parameterized in each case by means of coordinate values Z R, Y R for the right reference point BP R or the right zero-view direction NBR R and by means of coordinate values Z L, Y L for the left reference point BP L or the left zero-view direction NBR L as illustrated in FIG. 1.The aim of a method for positioning the reference points BP of the eyeglass lenses 5 relative to the lens frame 4 is to bring the reference points BP R, BP L into coincidence with the points of intersection of the zero-view directions NBR R, NBR L both horizontally (z-coordinate) and vertically (y-coordinate).This positioning method is explained below in particular with reference to FIG. 2 ff. This explanation is made with the aid of FIGS. 2 to 5 on the basis of a left half of the spectacles and can be correspondingly transferred in this respect to an entire spectacles. Within the scope of such a positioning method, raw spectacle lenses 6 with known reference point positions BP L, BP R are first fitted into the respective lens frames 4. The raw spectacle lenses 6 can be lenses without refractive power or else cost-effectively produced lenses with refractive power that approximates the needs of the user of the spectacle.FIG. 2 shows a correspondingly fitted raw spectacle lens 6 L with a known reference point position BP L relative to the lens frame 4; this reference point position BP L is marked on the raw spectacle lens 6 L with two intersecting lens reference lines 7, 8, which is carried out by means of a marking step of the positioning method.FIG. 3 shows the situation after the application of a perforated ring marking 9 L on the raw spectacle lens 6 L.FIG. 7 shows one of the hole ring markings 9, This hole ring marking 9 can be used as the left hole ring marking 9 L and / or as the right hole ring marking 9 R.The perforated ring mark 9 has a total of four radial perforated ring reference lines 10 1 to 10 4. Two adjacent ones of these perforated ring reference lines 10 i each run at a reference line angle of 90° with respect to one another. The perforated ring reference lines 10 1 and 10 3 run horizontally when the perforated ring marking 9 is applied, and the perforated ring reference lines 10 2 and 10 4 then run vertically. The two horizontal ring-of-hole reference lines 10 1 and 10 3 are aligned with one another. The two vertically extending ring-of-hole reference lines 10 2 and 10 4 are aligned with one another.The ring-of-holes reference lines 10 i are applied to a marking ring 11 of the ring-of-holes markings 9, which surrounds a marking hole 12.In the region of the perforated ring reference line 10 3 shown on the left in FIG. 7, the marking ring 11 has a bulge 13, within which a company logo 14 can be applied.On the rear side to the front side of the perforated ring marking 9 shown in FIG. 7, the perforated ring marking has an adhesive surface for fixing on the raw spectacle lens 6.FIG. 3 shows the perforated ring marking 9 L applied to the raw spectacle lens 6 L in such a way that the four perforated ring reference lines 10 i are aligned with the lens reference lines 7, 8 applied beforehand. A center of each mark hole 12 then sets the reference point position BP L.The marking of the reference point position BP L on the raw spectacle lens 6 L was effected with a soluble marking medium. After the perforated ring marking 9 L has been applied to the raw spectacle lens 6 L the lens reference lines 7, 8 are removed in sections at the location where they cross within the marking hole 12 of the perforated ring marking 9.FIG. 4 shows the situation after this partial removal of the lens reference lines 7, 8.Subsequently, as shown in FIG. 5, an inner hole edge 15 of the hole ring marking 9 L is marked on the raw spectacle lens 6 L which is in turn carried out with a corresponding marking medium. The hole edge 15 thus illustrates a periphery of the marking hole 12 of the hole ring marking 9 L.Following these preparation steps, a measurement process is now carried out to what extent, in the case of both raw spectacle lenses 6 L and 6 R( not shown in the figure), a respective zero-view direction NBR L, NBR R runs through the respective reference point position BP L, BP R, that is to say through the center of the respective marking hole 12 of the hole ring marking 9 L, 9R.For this purpose, the spectacle frame 3 with the raw spectacle lenses 6 prepared according to FIGS. 2 to 5 is moved in L, 6R into a wearing position adapted to the user of the spectacle. The user of the eyeglasses thus sets the eyeglass frame 3.FIG. 6 illustrates an instantaneous situation after this transfer step.Now, the hole ring markings 9 L, 9R are used as a sighting aid in measuring the extent to which, in the case of both raw spectacle lenses 6 L, 6R the respective zero-view direction NBR R, NBR L runs through the respective reference point position BP R, BP L i.e. corresponds both horizontally and vertically thereto.When performing this measurement process, the spectacle user can initially just be opposite the matching person, i.e. for example an eye optician, and it is first checked roughly with the aid of the so-called Victorin method whether pupil centers of the spectacle user are congruent L, 9R with the hole ring centers of the marking holes 12 of the hole ring markings 9. In this case, particular attention is paid to the horizontal measured values Z L, Z R and to y height differences between a right eye and a left eye of the spectacle user.Subsequently, the measuring process is carried out to what extent the respective zero-view direction NBR L, NBR R runs through the respective reference point position BP L, BP R in the case of both raw spectacle lenses 6 L, 6R during a movement process of the spectacle user wearing the spectacle frame 3 with the raw spectacle lenses 6 L, 6R in particular during walking. For this purpose, the user of the eyeglasses walks towards the adjuster when the eyeglass frame 3 is placed on. The adjuster looks L, 9R into the eyes of the spectacle user through the marking holes 12 of the hole ring markings 9 and roughly checks a position of the pupils of the spectacle user and a posture of the spectacle user. The user then looks through the marking holes 12 of the hole ring markings 9 in L, 9R at an object at infinity, for example an object visible through a room window. Subsequently, the spectacle user walks a few steps in his viewing direction, wherein both the spectacle user and the matching person observe the head pose of the spectacle user. If the user of the eyeglasses has to lift his head remotely when looking through the marking holes 12, the position of the ring-of-holes markings 9 L, 9R relative to the raw eyeglass lenses 6 is corrected by the adjuster in an upward L, 6R direction, i.e. in the positive y-direction. If, on the other hand, the user of the eyeglasses must lower his head remotely when looking through the marking holes 12, the position of the hole ring markings 9 L, 9R downward, i.e. in the negative y-direction, relative to the raw eyeglass lenses 6 L, 6R is corrected accordingly by the adjuster.These corrective measures can be supported by a sensoric detection of a viewing direction of the spectacle user when looking at the distance.These correction steps are carried out until the spectacle user has a natural head position remotely when looking through the centers of the marking holes 12 of the hole ring markings 9.The result of these correction steps is obtained on the basis of a then visible relative position between the centers of the marking rings 11 of the hole ring markings 9 L, 9R, which may have changed their position and which specify the actual zero-view directions NBR L, NBR R and thus the desired reference point positions, to the crossing points of the lens reference lines 7 and 8, which specify the actual reference point positions BP L, BP R.Following the above-explained dynamic execution of the measurement process, an adjustment of a pupil distance (z-positions) of the reference points can be carried out subsequently. For this purpose, the user of the eyeglasses looks at an object far away and it is checked whether, when looking simultaneously through the marking holes 12 of both hole ring markings 9 L, 9R he has an actually circular impression of the respective marking hole 12 (12 L, 12R). If the visual impression of the spectacle user is a lying oval (z-extension greater than y-extension), the z-distance of the centers of the marking rings 11 of the hole ring markings 9 is corrected in L, 9R until the visual impression "circular marking hole 12 (12 L, 12R)" is obtained at the spectacle user.If the spectacle user perceives the marking holes 12 (12 L, 12R) as oblique ovals when looking at an object remotely, a difference y R- y L of grinding heights of the raw spectacle lenses 6 L, 6R to one another is corrected. This is done by displacing the perforated ring markings 9 L, 9R relative to one another in the y-direction with a constant z-spacing until the spectacle user perceives the marking holes 12 (12 L, 12R) of the perforated ring markings 9 L, 9R circularly when looking at the distance. Parallel to this grinding-in height difference correction, the dynamic measuring process to what extent a respective zero-view direction NBR L, NBR R runs through the respective reference point position BP L, BP R in the case of both raw spectacle lenses 6 L, 6R can take place during a movement process of the spectacle user, as already explained above. A correction of the grinding-in height difference can then be carried out iteratively together with this dynamic measurement process.The above-explained measurement steps can also be supported by a sensor-based detection of a viewing direction of the user of the eyeglasses.The position of the perforated ring marking 9 L, 9R applied on the respective raw spectacle lens 5 L, 5R is adapted during the course of the measuring method such that a center of the respective perforated ring, i.e. of the marking ring 11 ( 11 L, 11R) corresponds to the desired reference point position. The perforated ring marking 9 L, 9R can then be used for transferring this desired reference point position on the respective raw spectacle lens 5 L, 5R.The centers found at the end of this measurement process, which are specified by intersection points of the radial perforated ring reference lines 10 i represent setpoint reference point positions, which correspond to the zero-view directions NBR L, NBR R of the spectacle user found during the measurement process carried out by corresponding position correction of the perforated ring markings 9 L, 9R by the raw spectacle lenses 6 L, 6R. Any y and z differences which may be present between these found desired reference point positions and the original actual reference point positions BP L, BP R( compare FIG. 2 ) are then measured and, on the basis of the correspondingly found difference values of the longest y coordinate and the longest z coordinate for the two raw spectacle lenses 6 L, 6R it is then possible to produce the progressive-vision spectacle lenses 5 R, 5L whose actual reference point positions coincide with the desired reference point positions determined by means of the measurement process. The progressive-vision optical eyeglass lenses 5 L, 5R thus prepared are then fitted into the lens frame 4 of the eyeglass frame 3.Alternative configurations of the perforated ring markings 9 L, 9R can also have reference line angles other than 90° between adjacent perforated ring reference lines 10 i, 10i+1 for example 45° or 30°. Accordingly, a number i of the perforated ring reference lines 10 i can also differ from four and can be, for example, three, five, six or even greater.

Claims

Method for positioning reference points (BP) of correcting optical spectacle lenses (5 R, 5L) relative to a lens frame (4) of a spectacle frame (3), comprising the following steps: - fitting raw spectacle lenses (6 R, 6L) with a known reference point position (BP R, BP L) into the lens frame (4), - marking the reference point position (BP R, BP L) on the respective spectacle lens (5 R, 5L) with two intersecting lens reference lines (7, 8), - applying a perforated ring marking (9 R, 9L), having at least two radial ring-of-hole reference lines (10 1 to 10 4) running at a reference line angle to one another such that the ring-of-hole reference lines (10 1 to 10 4) are aligned with the lens reference lines (7, 8), - bringing the spectacle frame (3) into a wearing position matched to a user of the spectacle, - using the ring-of-hole marking (9 R, 9L) as a sighting aid when measuring to what extent a respective zero-view direction (NBR R, in the two raw spectacle lenses (6 R, 6L), nbr_ner22_) passes through the respective reference point position (BP R, BP L) - determining, as a result of a sighting measurement using the hole ring mark (9 R, 9L), a target reference point position (BP R, BP L), which corresponds to the respective actual zero-viewing direction (NBR R, NBR L) through the raw eyeglass lenses (6 R, 6L) for both raw eyeglass lenses (6 R, 6L) both in the horizontal direction (z) and in the vertical direction (y), preparing optical eyeglass lenses (5 R, 5L), whose reference point position coincides with the target reference point position (BP R, BP L) and fitting the optical eyeglass lenses (5 R, 5L) into the lens frame (4) of the eyeglass frame (3).Method according to claim 1, characterised in that the marking takes place with a soluble marking medium and that after the application of the ring-of-hole markings (9 R, 9L) the lens reference lines (7, 8) are removed in sections at the location where they cross within an inner hole (12) of the ring-of-hole marking (9 R, 9L).Method according to claim 1 or 2, characterised bymarking an inner hole edge (15) of the hole ring mark (9 R, 9L) on the respective spectacle lens (6 R, 6L).Method according to one of Claims 1 to 3, characterized bya procedure for carrying out the measuring process to what extent, in the case of both raw spectacle lenses (6 R, 6L) a respective zero-view direction (NBR R, NBR L) runs through the respective reference point position (BP R, BP L) during a movement process of the spectacle user wearing the spectacle frame.Method according to one of claims 1 to 4, characterised bya matching of the position of the perforated ring marking (9 R, 9L) applied to the respective raw spectacle lens (6 R, 6L) during use as a sighting aid in such a way that a centre of the perforated ring (9 R, 9L) corresponds to the desired reference point position (BP R, BP L) and by a use of the perforated ring marking (9 R, 9L) for transferring the desired reference point position (BP R, BP L) to the respective raw spectacle lens (6 R, 6_ner68_).Perforated ring marking (9) for application on a spectacle lens (6) for carrying out a method according to one of the preceding claims for positioning reference points (BP) of correcting optical spectacle lenses (5) relative to a lens frame (4) of a spectacle frame (3), - with a marking ring (11) which surrounds a marking hole (12), - with at least two perforated ring reference lines (10 1 to 10 4), which run radially with respect to one another and with respect to a center of the marking hole (12), and which are applied on the marking ring (11).Perforated ring marking according to Claim 6, characterized bythe perforated ring reference lines (10 1 to 10 4).Perforated ring marking according to Claim 6 or 7, characterized bytwo horizontally running, aligned perforated ring reference lines (10 1, 103).Perforated ring marking according to one of Claims 6 to 8, characterized bytwo vertically running, aligned perforated ring reference lines (10 2, 104).Perforated ring marking according to one of Claims 6 to 9, characterized in that the marking ring has an adhesive surface.

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