Lens testing apparatus
The imaging system and projection screen of the lens inspection equipment automatically identify the pupil height and pupil distance of the lens, solving the problem of low efficiency of manual inspection in the existing technology and realizing efficient and accurate measurement of pupil height and pupil distance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN SHENGDA TONGZE TECH CO LTD
- Filing Date
- 2026-05-28
- Publication Date
- 2026-06-26
AI Technical Summary
The detection of pupil height and pupil distance in existing finished eyeglasses relies on manual measurement, which is inefficient, costly, and prone to human error.
Using lens inspection equipment, parallel light is projected onto the lens through an imaging system. The size scale on the projection screen and the inspection device automatically identify the pupil height and pupil distance of the lens, reducing manual intervention.
It enables rapid and accurate detection of pupil height and pupil distance, improving detection efficiency, reducing human error, and avoiding the risk of lens scratches.
Smart Images
Figure CN122281691A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of lens testing technology, and in particular to a lens testing device. Background Technology
[0002] Currently, myopia control defocus lenses and progressive multifocal lenses are widely praised in the market due to their unique functionality. Their lens shape is formed by factory machining. This type of eyeglasses not only requires precise diopter accuracy but also extremely high precision in the position of the light beam; otherwise, spatial deviations will significantly reduce its functionality. Therefore, during the production process, excimer lasers are used to leave two symmetrical, tiny invisible markers inside the lens to help technicians, inspectors, and assembly personnel identify the direction and position. The center of these two invisible markers must correspond to the wearer's pupillary height and pupillary distance. Pupillary distance is defined as the distance between the centers of the pupils of both eyes, and pupillary height is defined as the distance from the center of the pupil to the bottom edge of the lens. Precise assembly based on pupillary height and pupillary distance parameters not only ensures that light falls accurately on the retina, providing excellent visual clarity and effectively guaranteeing functionality, but also better meets wearing comfort, avoiding problems such as eye strain, dizziness, blurred vision, or exacerbation of refractive errors. Therefore, the actual pupillary height and pupillary distance measurement after assembly is of great significance.
[0003] However, current methods for measuring pupillary height and pupillary distance in these types of finished eyeglasses involve the following steps: Inspectors observe the lens against a light source, locate two invisible markers at the edge of the transition zone between light intensity and intensity, and mark these markers with an oil-based pen. They then measure and mark the center of the line connecting these markers (the optical center reference point) with an oil-based pen. Next, they measure the horizontal distance from the midline of the nose bridge to this center point and record it as the monocular pupillary distance. The vertical distance from the center of this line to the bottom edge of the lens is measured and recorded as the pupillary height. Alternatively, the midline of the nose bridge and the markers can be aligned with the reference point on the lens restoration card, and the pupillary height and pupillary distance values can be read. These methods rely heavily on the experience of the inspectors, have low inspection efficiency, and are costly in terms of personnel. Summary of the Invention
[0004] The main objective of this invention is to propose a lens testing device that aims to improve the current methods for testing pupil height and pupil distance in finished eyeglasses, which suffer from low testing efficiency.
[0005] To achieve the above objectives, the lens testing equipment proposed in this invention has a placement station for placing finished eyeglasses in a first direction. The lens testing equipment includes: A projection screen is positioned along the first direction toward the placement station, and the projection screen has a size scale. An imaging system is configured to illuminate parallel light toward the placement station along the first direction, such that the irradiation area of the parallel light covers at least a plurality of key detection points on the lens of the finished eyeglasses, and to project the image of the finished eyeglasses onto the projection screen proportionally, wherein the plurality of key detection points include invisible marker points and bottom edge points on the lens; and, A detection device is used to detect the pupil height and / or pupil distance of the lens based on the overlapping image of the size scale of the projection screen and a plurality of the detection key points.
[0006] In one embodiment, the imaging system includes: Lasers, used to output laser light in the visible light band; and, A beam expander unit, wherein the input end of the beam expander unit is disposed toward the laser and is used to receive the laser, and the output end of the beam expander unit is disposed along the first direction toward the placement station and is used to expand the irradiation area of the laser.
[0007] In one embodiment, the beam expander unit includes: A beam-expanding collimating lens, wherein the input end of the beam-expanding collimating lens is used to receive the laser output from the laser, and the output end of the beam-expanding collimating lens is used to output expanded laser beam; and, The beam splitting assembly includes at least one beam splitting prism and at least one reflector. The at least one beam splitting prism is used to receive the expanded laser beam. The at least one beam splitting prism and the at least one reflector cooperate with each other to split the expanded laser beam into multiple beams distributed along a second direction and output towards the first direction, so that the multiple beams of the ... Wherein, the first direction intersects with the second direction.
[0008] In one embodiment, the beam expanding unit further includes a rectangular aperture, which is disposed between the output end of the beam expanding collimating lens and the beam splitting component, and is configured to shape the circular expanded laser beam into a rectangular expanded laser beam; The beam splitting component is configured to split the rectangular beam expander laser into multiple rectangular beam split lasers, and in the projection in the first direction, the multiple rectangular beam split lasers are spliced together along the second direction.
[0009] In one embodiment, the output end of the beam expanding collimating lens is disposed in the first direction; Two beam splitters are arranged along the first direction. The two beam splitters include a first beam splitter and a second beam splitter. The light-incident surface of the first beam splitter is arranged facing the output end of the beam expanding collimating lens, and the light-exiting surface of the second beam splitter is used to output transmitted laser light. Two reflectors are provided, each corresponding to the light-emitting surface of the two beam splitters, and are used to output reflected laser light in the first direction; The multiple beams of split laser light include the transmitted laser light and two reflected laser light beams.
[0010] In one embodiment, the imaging system further includes an image transfer component disposed between the placement station and the projection screen, and configured to project the image of the finished glasses onto the projection screen at a 1:1 scale.
[0011] In one embodiment, the image transmission assembly includes two positive lenses, which are disposed opposite to each other along the first direction, and the two positive lenses have equal focal lengths and coincident focal points. The distance between the lens of the finished glasses and the projection screen is equal to twice the relative distance between the two positive lenses.
[0012] In one embodiment, the projection screen is light-transmitting, and the detection device is disposed on the side of the projection screen opposite to the imaging system.
[0013] In one embodiment, the size scale includes a lateral scale, the arrangement of which is configured to match the left-right direction of the image of the finished eyeglasses, and the lateral scale is configured to detect the interpupillary distance of the lens; and / or, The size scale includes a vertical scale, the arrangement of which is configured to match the vertical direction of the image of the finished eyeglasses, and the vertical scale is configured to detect the pupil height of the lens.
[0014] In one embodiment, the detection device includes: An image acquisition unit is used to acquire an image of the overlap between the size scale of the projection screen and the projection of the lens; and, A data processing unit is electrically connected to the image acquisition unit. The data processing unit is used to identify the coordinate parameters of multiple detection key points in the overlapping image, and to determine at least one of the pupil height and pupil distance of the lens based on the multiple coordinate parameters.
[0015] The technical solution provided by this invention utilizes an imaging system to illuminate parallel light along a first direction onto finished eyeglasses placed at a workstation. Since the parallel light covers multiple key detection points on the lenses of the finished eyeglasses (including hidden markers and bottom edge points), it projects the image of the finished eyeglasses onto a projection screen proportionally. The projection screen is equipped with dimensional scales, and the detection device can detect the pupillary height and pupillary distance of the lens based on the overlapping image of the dimensional scales and multiple key detection points on the projection screen. This lens detection method changes the traditional reliance on manual detection. Through optical imaging and scale comparison, it can quickly and accurately obtain detection results, effectively improving detection efficiency and reducing errors caused by human factors. It provides an automated and high-precision solution for detecting the pupillary height and pupillary distance of finished eyeglasses, while also avoiding direct physical contact with the lens surface, reducing the risk of lens scratches. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0017] Figure 1 A simplified structural diagram of an embodiment of the lens testing device provided by the present invention; Figure 2 This is a schematic diagram of parallel light irradiating finished eyeglasses in the lens testing equipment provided by the present invention; Figure 3 This is a schematic diagram of the size scale on the projection screen in the lens testing device provided by the present invention; Figure 4 The lens inspection device provided by this invention projects an image of the size scale on the screen and multiple key inspection points of the finished eyeglasses during the inspection process; Figure 5 A flowchart of an embodiment of the detection method of the lens testing equipment provided by the present invention; Figure 6 A flowchart of another embodiment of the detection method of the lens testing equipment provided by the present invention.
[0018] Explanation of icon numbers: 100. Lens testing equipment; 1. Projection screen; 11. Size scale; 111. Horizontal scale; 112. Vertical scale; 1121. Reference scale; 1122. Range scale; 2. Imaging system; 21. Laser; 22. Beam expander unit; 22a. Beam splitter; 221. Beam expander collimating lens; 222. Beam splitter assembly; 2221. Beam splitter prism; 2221a. First beam splitter prism; 2221b. Second beam splitter prism; 2222. Mirror; 223. Rectangular aperture; 224. Image transfer assembly; 2241. Positive lens; 3. Detection device; 31. Image acquisition unit; 32. Data processing unit; 4. Placement of workstations; 200. Finished eyeglasses; 210. Lenses; 211. Key inspection points; 211a. Invisible marking points; 211b. Bottom edge points; 211c. Center of the connecting line; 211d. Midline of the bridge of the nose; X, first direction; Y, second direction; Z, third direction.
[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.
[0023] To facilitate understanding of the lens inspection device provided by the present invention, the following description is provided in conjunction with the accompanying drawings, wherein... Figure 1 A simplified structural diagram of an embodiment of the lens testing device provided by the present invention; Figure 2 This is a schematic diagram of how parallel light projects the image of the finished eyeglasses onto a projection screen in the lens testing device provided by the present invention; Figure 3 This is a schematic diagram of the size scale on the projection screen in the lens testing device provided by the present invention; Figure 4 The lens inspection device provided by this invention projects images of the size scale on the screen and multiple key inspection points of the finished glasses during the inspection process.
[0024] Please see Figure 1 and Figure 2 The lens inspection device 100 provided by the present invention has a placement station 4, which is used to place finished glasses 200 in the first direction X. The lens inspection device 100 includes a projection screen 1, an imaging system 2 and an inspection device 3. The projection screen 1 is set in the first direction X towards the placement station 4 and has a size scale 11. The imaging system 2 is used to irradiate parallel light in the first direction X towards the placement station 4, and the irradiation area of the parallel light covers at least a plurality of inspection key points 211 of the lens 210 of the finished glasses 200, and projects the image of the finished glasses 200 onto the projection screen 1 proportionally. The plurality of inspection key points 211 include the invisible marking point 211a and the bottom edge point 211b of the lens 210. The detection device 3 is used to detect the pupil height and / or pupil distance of the lens 210 based on the overlapping image of the size scale 11 of the projection screen 1 and multiple detection key points 211.
[0025] Regarding "placement station 4 is used to place finished glasses 200 in the first direction X", it can be understood that after the finished glasses 200 is placed in placement station 4, the lens 210 of the finished glasses 200 is oriented in the first direction X. The first direction X can be any direction in principle, such as the up and down direction or the horizontal direction. However, considering the actual needs of use, the first direction X is usually the horizontal direction, such as the front and back direction.
[0026] The function of the "imaging system 2" is to illuminate parallel light along the first direction X toward the placement station 4, so that the parallel light can illuminate the lens 210 of the finished glasses 200 along the first direction X. There are various structures for the imaging system 2 to output parallel light. For example, the imaging system 2 includes a searchlight, which reflects the light emitted by the point source through its parabolic reflector to form parallel light. Since the detection of the pupil height or pupil distance of the lens 210 only needs to be based on multiple detection key points 211, this embodiment does not require the "parallel light" to completely illuminate the entire area of the finished glasses 200, or even the entire area of the lens 210 of the finished glasses 200. It is only necessary to be able to illuminate multiple detection key points 211.
[0027] Based on the phrase "projecting the image of the finished glasses 200 onto the projection screen 1 proportionally," it can be understood that this embodiment allows the image of the finished glasses 200 to be magnified or reduced by a certain proportion, but this magnification must be known, so that the true result can be obtained based on the actual test results and the known magnification. "Proportional" means that the relative position of the detection key point 211 to the actual edge of the lens 210 is the same as the relative position of the detection key point 211 to the edge of the image of the lens 210 on the projection. For example, assuming that in... Figure 2 In the middle, the distance between the invisible mark 211a on the left side of the left lens 210 and the left edge is 1 / 4 of the total length of the left lens 210 in the left-right direction. For the invisible mark 211a on the left side, whether on the actual lens 210 or in the projection, this length ratio should be ensured to be 1 / 4.
[0028] Because the projection screen 1 is oriented towards the first direction X, parallel light can project a complete image of the finished glasses 200 perpendicularly onto the projection screen 1 in the first direction X. Since the projection screen 1 has a size scale 11, the image of the finished glasses 200 can overlap with the size scale 11, resulting in an image of the size scale 11 coinciding with multiple detection key points 211. The size scale 11 provides coordinate references for the multiple detection key points 211. By identifying the coordinate references of the multiple detection key points 211, the detection device 3 can derive the size information between two related detection key points 211. For example, please refer to... Figure 4Each lens 210 has multiple detection key points 211, including two hidden marker points 211a. The coordinate values x1, x2, x3, and x4 of the four hidden marker points 211a can be determined according to the size scale 11. The pupillary distance PD of the lens 210 of the finished eyeglasses 200 is PD = x3 - x1 or PD = x4 - x2. The monocular pupillary distances of the left eye lens 210 and the right eye lens 210 are respectively equal to (x3 + x2) / 2 - x1 - 17 and x4 - (x3 + x2) / 2 - x1 - 17. x2) / 2-17, where the two invisible markers 211a on a single lens 210 are usually a fixed value of 34mm, and "17" is half of this fixed value; for example, the multiple detection key points 211 of each lens 210 include two invisible markers 211a and a bottom edge point 211b. The pupil height PH of the lens 210 of the finished glasses 200 is equal to the distance from the bottom edge point 211b to the line connecting the two invisible markers 211a, which is the distance y in the figure; where "bottom edge point 211b" refers to the point where the bottommost (i.e., the lowest) edge of the outer periphery of the lens 210 connects with the frame in the normal wearing scenario of the finished glasses 200.
[0029] It is worth mentioning that when parallel light irradiates the lens 210, the invisible marker 211a inside the lens 210, as an internal "defect", will produce a diffraction effect, and the invisible marker 211a will immediately appear, thus presenting a corresponding image on the projection screen 1.
[0030] The embodiments of the present invention can detect only one of the pupil height and pupil distance of the lens 210, or can detect both simultaneously.
[0031] The technical solution provided by this invention uses an imaging system 2 to illuminate parallel light along a first direction X toward the finished eyeglasses 200 placed at the placement station 4. Since the parallel light covers multiple key detection points 211 on the lens 210 of the finished eyeglasses 200 (including hidden marker points 211a and bottom edge points 211b), it projects the image of the finished eyeglasses 200 onto a projection screen 1 proportionally. The projection screen 1 is equipped with a size scale 11. The detection device 3 can detect the pupillary height and pupillary distance of the lens 210 based on the overlapping image of the size scale 11 and the multiple key detection points 211 on the projection screen 1. This lens 210 detection method changes the traditional manual detection mode. Through optical imaging and scale comparison, it can quickly and accurately obtain detection results, effectively improving detection efficiency and reducing errors caused by human factors. It provides an automated and high-precision solution for detecting the pupillary height and pupillary distance of the finished eyeglasses 200, while also avoiding direct physical contact with the lens 210 surface, reducing the risk of scratches on the lens 210.
[0032] Please continue reading. Figure 1In one embodiment, the imaging system 2 includes a laser 21 and a beam expander 22; the laser 21 is used to output laser light in the visible light band; the input end of the beam expander 22 is disposed toward the laser 21 to receive the laser light, and the output end of the beam expander 22 is disposed along the first direction X toward the placement station 4 to expand the irradiation area of the laser light.
[0033] In the above technical solution, the laser 21 can output a high-brightness laser. On this basis, the beam expansion unit 22 can expand the irradiation area of the laser, so that it can meet the requirements of irradiating multiple key detection points 211, while ensuring sufficient brightness to facilitate obtaining clear overlapping images.
[0034] In one embodiment, the beam expanding unit 22 includes a beam expanding collimating lens 221 and a beam splitting assembly 222; the input end of the beam expanding collimating lens 221 is used to receive the laser output from the laser 21, and the output end of the beam expanding collimating lens 221 is used to output the expanded laser beam; the beam splitting assembly 222 includes at least one beam splitting prism 2221 and at least one reflector 2222, the at least one beam splitting prism 2221 is used to receive the expanded laser beam, and the at least one beam splitting prism 2221 and the at least one reflector 2222 cooperate with each other to split the expanded laser beam into multiple beam split lasers 22a distributed along the second direction Y and output towards the first direction X, and make the multiple beam split lasers 22a jointly cover multiple detection key points 211; wherein, the first direction X intersects the second direction Y.
[0035] "The first direction X intersects the second direction Y" means that there is an angle between the first direction X and the second direction Y. This angle can, in principle, take any value between 0° and 180° (excluding the values at 0° and 180°). Typically, the angle between the first direction X and the second direction Y is 90°, meaning they are perpendicular. The second direction Y usually matches the left-right orientation of the finished eyeglasses (200).
[0036] The core function of the "beam expander collimating lens 221" is to simultaneously expand the diameter of the laser and compress the divergence angle, thereby obtaining a parallel light with a larger diameter, better directionality, and more uniform energy density.
[0037] The "beam splitting assembly 222" consists of a beam splitting prism 2221 and a reflector 2222. Since this embodiment does not limit the number of beam splitting lasers 22a, the specific number of beam splitting prisms 2221 and reflectors 2222 is not limited. For example, when only two beams of beam splitting lasers 22a are required, only one beam splitting prism 2221 and one reflector 2222 are needed. The output end of the beam expanding collimating lens 221 is set along the first direction X toward the light-incident surface of the beam splitting prism 2221, and the light-transmitting exit surface of the beam splitting prism 2221 is set along the first direction X toward the placement station 4, thereby outputting transmitted laser. The light-incident surface of the reflector 2222 is set along the second direction Y toward the light-reflecting exit surface of the beam splitting prism 2221, and the light-exit surface of the reflector 2222 is set along the first direction X toward the placement station 4, thereby outputting reflected laser.
[0038] In the above technical solution, the beam expanding unit 22, with the aid of the beam expanding collimating lens 221, can obtain a beam expanding laser with a larger diameter, better directionality, and more uniform energy density, thus ensuring the accuracy of detection. With the aid of the beam splitting component 222, the beam expanding laser can be split into multiple beam split lasers 22a. The cross-sectional area of each beam split laser 22a is equal to that of the beam expanding laser, and the multiple beam split lasers 22a are distributed along the second direction Y, thereby illuminating the entire area of the finished glasses 200 in the left and right directions, and jointly covering multiple key detection points 211, which can meet the detection needs of finished glasses 200 of various sizes and specifications.
[0039] Please see Figure 2 In one embodiment, the beam expanding unit 22 further includes a rectangular aperture 223, which is disposed between the output end of the beam expanding collimating lens 221 and the beam splitting component 222. The rectangular aperture 223 is configured to shape the circular beam expanding laser into a rectangular beam expanding laser. The beam splitting component 222 is configured to split the rectangular beam expanding laser into multiple rectangular beam split lasers 22a, and in the projection of the first direction X, the multiple rectangular beam split lasers 22a are spliced together along the second direction Y.
[0040] It should be noted that the laser output from laser 21, after being expanded and adjusted by beam expanding and collimating lens 221, is usually a circular expanded laser (the cross-section of the laser is circular). The function of "rectangular aperture 223" is to shape it into a rectangular expanded laser with a rectangular cross-section. The principle is that when the circular laser passes through rectangular aperture 223, only part of the light rays located in the rectangular opening area of rectangular aperture 223 in the propagation direction can pass through, while the rest of the light rays are blocked. This directly determines that the cross-sectional shape of the emitted laser is rectangular.
[0041] exist Figure 2In the embodiment shown, three rectangular split laser beams 22a are spliced together along the second direction Y to form a long beam that can directly cover the entire finished glasses 200.
[0042] In the above technical solution, the rectangular aperture 223 can shape the circular expanded laser output by the beam expanding collimating lens 221 into a rectangular expanded laser. After passing through the beam splitting component 222, the rectangular expanded laser can be divided into multiple rectangular beam split lasers 22a with the same cross-section. Two adjacent rectangular beam split lasers 22a in the second direction Y can approach each other, thereby splicing them into a long beam with a larger irradiation area, ensuring complete coverage of the finished glasses 200.
[0043] Please see Figure 1 In one embodiment, the output end of the beam expanding collimating lens 221 is disposed facing the first direction X; two beam splitting prisms 2221 are arranged along the first direction X, the two beam splitting prisms 2221 include a first beam splitting prism 2221a and a second beam splitting prism 2221b, the light incident surface of the first beam splitting prism 2221a is disposed facing the output end of the beam expanding collimating lens 221, and the light transmitting and emitting surface of the second beam splitting prism 2221b is used to output transmitted laser; two reflectors 2222 are disposed, the two reflectors 2222 are respectively disposed corresponding to the light reflecting and emitting surfaces of the two beam splitting prisms 2221, and are used to output reflected laser in the first direction X; wherein, the multi-beam split laser 22a includes transmitted laser and two reflected lasers.
[0044] In the above technical solution, two beam splitters 2221 are arranged along the first direction X. The expanded laser output from the beam expanding collimating lens 221 passes through the two beam splitters 2221 in sequence to obtain transmitted laser. When the expanded laser passes through the beam splitting surfaces of the two beam splitters 2221 respectively, it can also obtain two reflected lasers. The two reflectors 2222 are used to adjust the irradiation direction of the reflected laser so that it is output in the first direction X, and finally obtain three split lasers 22a.
[0045] In another embodiment, the output end of the beam expanding collimating lens 221 is arranged in the second direction Y; two beam splitters 2221 are arranged along the second direction Y, including a first beam splitter 2221a and a second beam splitter 2221b. The light-incident surface of the first beam splitter 2221a is arranged in the direction Y, and the light-reflecting surface of the first beam splitter 2221a is used to output reflected laser light in the first direction X. The light-reflecting surface of the second beam splitter 2221b is used to output reflected laser light in the first direction X. A reflector 2222 is provided, which is arranged corresponding to the light-transmitting surface of the second beam splitter 2221b and is used to reflect and output transmitted laser light in the first direction X. The multi-beam split laser 22a includes transmitted laser light and two reflected laser light.
[0046] Specifically, the first beam splitter 2221a and the second beam splitter 2221b are polarizing beam splitters 2221. A λ / 2 waveplate is also provided between the first beam splitter 2221a and the second beam splitter 2221b to adjust the polarization state of the light incident on the polarizing beam splitter 2221, so as to control the beam splitting ratio.
[0047] Considering that the lens 210 of the finished glasses 200 usually has a photometric power, parallel light will usually turn into non-parallel light after passing through the lens 210. The projection of non-parallel light on the projection plane will usually affect the detection accuracy. An improvement solution is to set the placement station 4 close to the projection screen 1 to minimize the adverse effect of the photometric power of the lens 210 on the detection results.
[0048] This invention provides another improvement; please refer to [link / reference]. Figure 1 In one embodiment, the imaging system 2 further includes an image transfer component 224, which is disposed between the placement station 4 and the projection screen 1 and configured to project the image of the finished glasses 200 1:1 onto the projection screen 1.
[0049] In the above technical solution, the image of the finished glasses 200 can be projected onto the projection screen 1 at a 1:1 ratio using the image transfer component, thereby reducing the final magnification conversion process and further improving the detection efficiency; at the same time, the image transfer component 224 can also eliminate the adverse effects of the lens 210's optical power.
[0050] Common image transmission components 224 include relay lens components, which can significantly correct spherical aberration, chromatic aberration, astigmatism, etc. by using a combination of multiple lenses (such as doublet lenses or triplet lenses) to obtain high-quality image transmission.
[0051] Specifically, in one embodiment, the image transmission component 224 includes two positive lenses 2241, which are arranged opposite to each other along a first direction X. The two positive lenses 2241 have equal focal lengths and coincident focal points. The distance between the lens 210 of the finished glasses 200 and the projection screen 1 is equal to twice the relative distance between the two positive lenses 2241.
[0052] Regarding the statement that "the distance between the lens 210 of the finished glasses 200 and the projection screen 1 is equal to twice the relative distance between the two positive lenses 2241," please refer to [link / reference needed]. Figure 1 In the image transmission component 224, the distance between the left positive lens 2241 and the lens 210 is z1, and the distance between the right positive lens 2241 and the projection screen 1 is z2. To accurately project the image of the finished glasses 200 (spatial position information of multiple detection key points 211) onto the projection screen 1 without geometric position deviation, the distance z1+z2=2f needs to be guaranteed.
[0053] The detection device 3 can acquire the overlapping image on the projection screen 1 from the side of the projection screen 1 facing the placement station 4.
[0054] In one embodiment, the projection screen 1 is light-transmitting, and the detection device 3 is disposed on the side of the projection screen 1 that is away from the imaging system 2.
[0055] "Projection screen 1 is light-transmitting" means that projection screen 1 is made of a semi-transparent material, such as wood pulp paper or a light-diffusing board material printed with size scale 11.
[0056] In the above technical solution, the projection screen 1 is set to be transparent, and the detection device 3 is set on the side of the projection screen 1 away from the imaging system 2. The detection device 3 can more clearly and accurately capture the overlapping image of the size scale 11 on the projection screen 1 and the detection key point 211. The projection screen 1 can block the ambient light, reducing the influence of light interference on the detection device 3. This setting allows the detection device 3 to focus on acquiring a clear detection image on the projection screen 1, providing high-quality raw image data for subsequent data processing.
[0057] Please see Figure 3 In one embodiment, the size scale 11 includes a horizontal scale 111, the arrangement direction of which is configured to match the left-right direction of the image of the finished eyeglasses 200, and the horizontal scale 111 is configured to detect the interpupillary distance of the lens 210.
[0058] Regarding the "arrangement direction of the horizontal scale 111", the horizontal scale 111 usually has multiple scale lines, and the distribution direction of these multiple scale lines is the arrangement direction of the horizontal scale 111. For example, in... Figure 3 In the above technical solution, multiple scale lines of the horizontal scale 111 are distributed along the second direction Y, and the arrangement direction of the horizontal scale 111 is the second direction Y. Through the arrangement of the horizontal scale 111, the lens testing device 100 at least has the function of detecting the interpupillary distance of the lens 210.
[0059] Please see Figure 3 In one embodiment, the size scale 11 includes a vertical scale 112, the arrangement direction of which is configured to match the vertical direction of the image of the finished eyeglasses 200, and the vertical scale 112 is configured to detect the pupil height of the lens 210.
[0060] Regarding the "arrangement direction of the vertical scale 112", the vertical scale 112 usually has multiple scale lines, and the distribution direction of these multiple scale lines is the arrangement direction of the vertical scale 112. For example, in... Figure 3In the above technical solution, multiple graduation lines of the vertical scale 112 are distributed along the third direction Z, and the arrangement direction of the vertical scale 112 is the third direction Z. By setting the vertical scale 112, the lens detection device 100 can at least detect the pupil height of the lens 210.
[0061] It should be noted that the two parallel technical features mentioned above, "dimension scale 11 includes horizontal scale 111" and "dimension scale 11 includes vertical scale 112", can be set individually or simultaneously.
[0062] Please continue reading. Figure 3 In one embodiment, the size scale 11 includes a horizontal scale 111, the arrangement direction of which is configured to match the left-right direction of the image of the finished eyeglasses 200. The horizontal scale 111 is configured to detect the interpupillary distance of the lens 210. The vertical scale 112 includes a reference scale 1121 and a range scale 1122. The reference scale 1121 intersects with the horizontal scale 111. The range scale 1122 and the horizontal scale 111 are distributed along a third direction Z, wherein the first direction X intersects with the third direction Z.
[0063] Considering that the four invisible markers 211a on the two lenses 210 of the finished glasses 200 are usually on the same horizontal line, in the above technical solution, the vertical scale 112 is divided into a reference scale 1121 and a range scale 1122. The intersection of the reference scale 1121 and the horizontal scale 111 provides a necessary reference. When the four invisible markers 211a of the finished glasses 200 are all on the reference scale 1121, it means that the left-right direction of the image of the finished glasses 200 matches the arrangement direction of the horizontal scale 111, and the up-down direction of the image of the finished glasses 200 matches the arrangement direction of the vertical scale 112. The detection device 3 can be used to identify and determine the coordinate parameters of multiple key detection points 211 and ensure the accuracy of the detection results.
[0064] Considering that there is usually a certain size span between the invisible marking point 211a and the bottom edge point 211b of the lens 210, it is understandable that setting scale lines within this span usually does not have a practical effect. In this technical solution, the range scale 1122 and the horizontal scale 111 are arranged along the third direction Z partition. The vertical scale 112 intersects with the horizontal scale 111 only through the reference scale 1121. This can effectively avoid the problem of large-scale intersection between the horizontal scale 111 and the vertical scale 112, which would reduce the image clarity of the projection screen 1. This is conducive to accurately identifying multiple detection key points 211.
[0065] Considering the possible differences in size and placement posture of finished glasses 200 at placement station 4, the positions of the four invisible markers 211a in the image of the finished glasses 200 may deviate from the vertical scale 112 on the projection screen 1. Please refer to [link / reference needed]. Figure 4 In another embodiment, the lens detection device 100 further includes an adjustment device with a mounting portion on which the projection screen 1 is mounted. The mounting portion is configured to be movable and adjustable in one of the directions of the second direction Y and the third direction Z, and / or rotatably adjustable along the axis of the first direction X, wherein the first direction X, the second direction Y, and the third direction Z intersect each other.
[0066] There are multiple ways to implement the adjustment of the "mounting part" along the second direction Y and the third direction Z. For example, the adjustment device includes a base, a main adjustment seat and a mounting part. The main adjustment seat is movably disposed on the base along the third direction Z, and the mounting part is movably disposed on the main adjustment seat along the second direction Y. The positions of the main adjustment seat and the base, and the mounting part and the main adjustment seat can be adjusted by screw, sleeve and knob assemblies, respectively. Similarly, the mounting part can be rotatably disposed on the main adjustment seat along the axis of the first direction X. This embodiment does not limit the base structure of the adjustment device.
[0067] In the above technical solution, by adjusting the installation along the second direction Y, the scale line of the horizontal scale 111 can be aligned with multiple invisible marker points 211a to ensure accurate horizontal coordinate reading. By adjusting the installation along the third direction Z, one of the scale lines of the vertical scale 112 can be aligned with multiple invisible marker points 211a simultaneously to ensure accurate vertical coordinate reading. By adjusting the installation by rotating it along the axis of the first direction X, when the vertical scale 112 is tilted relative to the connecting line of multiple invisible marker points 211a, one of the scale lines of the vertical scale 112 can be refitted with the connecting line.
[0068] Specifically, before the adjustment device is adjusted, the image of the finished glasses 200 and the image of the size scale 11 are as follows: Figure 4 As shown in the upper part of the diagram, the four invisible markers 211a of the finished glasses 200 are higher than the reference scale 1121 of the vertical scale 112. By adjusting the height of the mounting part in the third direction Z and the rotation angle of the mounting part along the axis of the first direction X, the four invisible markers 211a of the finished glasses 200 can be adjusted to coincide with the reference scale 1121. Figure 4 As shown in the lower part of the figure, it can be determined that the size scale 11 and multiple key detection points 211 are calibrated in place, and the reading can be started.
[0069] It should be noted that the two parallel technical features mentioned above, "the longitudinal scale 112 includes a reference scale 1121 and a range scale 1122, the reference scale 1121 intersects with the transverse scale 111, and the range scale 1122 and the transverse scale 111 are distributed along the third direction Z" and "the lens testing device 100 also has an adjustment device, the adjustment device has a mounting part, and the projection screen 1 is mounted on the mounting part", can be set either one or both.
[0070] In one embodiment, the detection device 3 includes an image acquisition unit and a data processing unit 32; the image acquisition unit is used to acquire the overlapping image of the size scale 11 of the projection screen 1 and the projection of the lens 210; the data processing unit 32 is electrically connected to the image acquisition unit 31, and the data processing unit 32 is used to identify the coordinate parameters of multiple detection key points 211 in the overlapping image, and determine at least one of the pupil height and pupil distance of the lens 210 according to the multiple coordinate parameters.
[0071] The image acquisition unit 31 can be a CCD camera, and the data processing unit 32 can be a computer. After the image acquisition unit 31 acquires the overlapping image of the size scale 11 of the projection screen 1 and the projection of the lens 210, it transmits the overlapping image to the data processing unit 32. The data processing unit 32 then uses machine vision algorithms to determine the coordinate parameters of multiple detection key points 211 of the lens 210 based on the overlapping image, and calculates the pupil height and pupil distance parameters of the eyeglass lens 210 based on the coordinate parameters.
[0072] To facilitate understanding of the detection method provided by this invention, the following description is provided in conjunction with the accompanying drawings, wherein... Figure 5 A flowchart of an embodiment of the detection method of the lens testing equipment provided by the present invention; Figure 6 A flowchart of another embodiment of the detection method of the lens testing equipment provided by the present invention.
[0073] Please see Figure 5 The detection method includes: S10. Obtain the overlapping image of the size scale 11 of the projection screen 1 and multiple detection key points 211; The overlapping images can be captured by taking pictures using the image acquisition unit 31 (e.g., a CCD camera).
[0074] S20. Determine the coordinate parameters of multiple detection key points 211 based on the overlapping image, and determine at least one of the pupil height and pupil distance of the lens 210 based on the multiple coordinate parameters.
[0075] The overlapping image can be transmitted to the data processing unit 32. The data processing unit 32 can determine the coordinate parameters of multiple detection key points 211 of the lens 210 based on the overlapping image using machine vision algorithms, and calculate the pupil height and pupil distance parameters of the eyeglass lens 210 based on the coordinate parameters.
[0076] The technical solution provided by this method allows the detection device 3 to detect the pupillary height and pupillary distance of the lens 210 based on the overlapping image of the size scale 11 on the projection screen 1 and multiple detection key points 211. This lens 210 detection method changes the traditional manual detection mode. Through optical imaging and scale comparison, it can quickly and accurately obtain detection results, effectively improving detection efficiency and reducing errors caused by human factors. It provides an automated and high-precision solution for the detection of pupillary height and pupillary distance of finished glasses 200, while also avoiding direct physical contact with the surface of the lens 210, reducing the risk of scratching the lens 210.
[0077] Please see Figure 6 In one embodiment, the size scale 11 includes a horizontal scale 111, the arrangement direction of which is configured to match the left-right direction of the image of the finished glasses 200. Step S20, which involves determining the coordinate parameters of multiple detection key points 211 based on the overlapping images and determining at least one of the pupil height and pupil distance of the lens 210 based on the multiple coordinate parameters, includes: S21. Determine the lateral coordinate parameters of multiple hidden marker points 211a based on the overlapping images; S22. Determine the pupillary distance of lens 210 based on multiple horizontal coordinate parameters.
[0078] In the above technical solution, the lateral coordinate parameters of multiple hidden marker points 211a are determined based on the overlapping image, and the size is calculated based on the multiple lateral coordinate parameters. This allows for the determination of the pupillary distance of the lens 210 and the monocular pupillary distance. Figure 4 In the finished glasses 200, the interpupillary distance PD of the lens 210 is x3-x1 or PD=x4-x2, and the interpupillary distances of the left eye lens 210 and the right eye lens 210 are (x3+x2) / 2-x1-17 and x4-(x3+x2) / 2-17, respectively.
[0079] Please see Figure 6 In one embodiment, the size scale 11 includes a vertical scale 112, the arrangement direction of which is configured to match the vertical direction of the image of the finished glasses 200. Step S20, which involves determining the coordinate parameters of multiple detection key points 211 based on the overlapping images and determining at least one of the pupil height and pupil distance of the lens 210 based on the multiple coordinate parameters, includes: S23. Determine the longitudinal coordinate parameters of multiple hidden marker points 211a and bottom edge points 211b based on the overlapping images; S24. Determine the pupil height of lens 210 based on multiple longitudinal coordinate parameters.
[0080] In the above technical solution, the longitudinal coordinate parameters of multiple hidden marker points 211a and bottom edge points 211b are determined based on the overlapping image, and the size is calculated based on the multiple longitudinal coordinate parameters to determine the pupil height of the lens 210. For example, Figure 4 In the finished glasses 200, the pupil height PH of the lens 210 is equal to the distance from the bottom edge point 211b to the line connecting the two invisible marker points 211a, which is the distance y in the figure.
[0081] The above descriptions provided by this invention are merely exemplary embodiments of this invention and do not limit the patent scope of this invention. Any equivalent structural transformations made using the contents of this specification and drawings under the technical concept of this invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this invention.
Claims
1. A lens inspection device, characterized in that, The lens testing equipment has a placement station for placing finished eyeglasses in a first direction. The lens testing equipment includes: A projection screen is positioned along the first direction toward the placement station, and the projection screen has a size scale. An imaging system is configured to illuminate parallel light toward the placement station along the first direction, such that the irradiation area of the parallel light covers at least a plurality of key detection points on the lens of the finished eyeglasses, and to project the image of the finished eyeglasses onto the projection screen proportionally, wherein the plurality of key detection points include invisible marker points and bottom edge points on the lens; and, A detection device is used to detect the pupil height and / or pupil distance of the lens based on the overlapping image of the size scale of the projection screen and a plurality of the detection key points.
2. The lens inspection device as described in claim 1, characterized in that, The imaging system includes: Lasers, used to output laser light in the visible light band; and, A beam expander unit, wherein the input end of the beam expander unit is disposed toward the laser and is used to receive the laser, and the output end of the beam expander unit is disposed along the first direction toward the placement station and is used to expand the irradiation area of the laser.
3. The lens testing equipment as described in claim 2, characterized in that, The beam expanding unit includes: A beam-expanding collimating lens, wherein the input end of the beam-expanding collimating lens is used to receive the laser output from the laser, and the output end of the beam-expanding collimating lens is used to output expanded laser beam; and, The beam splitting assembly includes at least one beam splitting prism and at least one reflector. The at least one beam splitting prism is used to receive the expanded laser beam. The at least one beam splitting prism and the at least one reflector cooperate with each other to split the expanded laser beam into multiple beams distributed along a second direction and output towards the first direction, so that the multiple beams of the ... Wherein, the first direction intersects with the second direction.
4. The lens testing equipment as described in claim 3, characterized in that, The beam expanding unit further includes a rectangular aperture, which is disposed between the output end of the beam expanding collimating lens and the beam splitting component. The rectangular aperture is configured to shape the circular expanded laser beam into a rectangular expanded laser beam. The beam splitting component is configured to split the rectangular beam expander laser into multiple rectangular beam split lasers, and in the projection in the first direction, the multiple rectangular beam split lasers are spliced together along the second direction.
5. The lens testing equipment as described in claim 3, characterized in that, The output end of the beam expanding collimating lens is positioned in the first direction; Two beam splitters are arranged along the first direction. The two beam splitters include a first beam splitter and a second beam splitter. The light-incident surface of the first beam splitter is arranged facing the output end of the beam expanding collimating lens, and the light-exiting surface of the second beam splitter is used to output transmitted laser light. Two reflectors are provided, each corresponding to the light-emitting surface of the two beam splitters, and are used to output reflected laser light in the first direction; The multiple beams of split laser light include the transmitted laser light and two reflected laser light beams.
6. The lens testing device as described in claim 1, characterized in that, The imaging system further includes an image transfer component disposed between the placement station and the projection screen, and configured to project the image of the finished glasses onto the projection screen at a 1:1 scale.
7. The lens testing device as described in claim 6, characterized in that, The image transmission component includes two positive lenses, which are arranged opposite each other along the first direction, and the two positive lenses have equal focal lengths and coincident focal points. The distance between the lens of the finished glasses and the projection screen is equal to twice the relative distance between the two positive lenses.
8. The lens testing equipment as described in claim 1, characterized in that, The projection screen is light-transmitting, and the detection device is located on the side of the projection screen opposite to the imaging system.
9. The lens testing equipment as described in claim 1, characterized in that, The size scale includes a horizontal scale, the arrangement direction of which is configured to match the left-right direction of the image of the finished eyeglasses, and the horizontal scale is configured to detect the interpupillary distance of the lens; And / or, The size scale includes a vertical scale, the arrangement of which is configured to match the vertical direction of the image of the finished eyeglasses, and the vertical scale is configured to detect the pupil height of the lens.
10. The lens inspection device as described in claim 1, characterized in that, The detection device includes: An image acquisition unit is used to acquire an image of the overlap between the size scale of the projection screen and the projection of the lens; and, A data processing unit is electrically connected to the image acquisition unit. The data processing unit is used to identify the coordinate parameters of multiple detection key points in the overlapping image, and to determine at least one of the pupil height and pupil distance of the lens based on the multiple coordinate parameters.