Lens measuring device and method

Abstract

The embodiment of the invention discloses a lens measuring device and method. The lens measuring device comprises a first light source, a second light source, an image acquisition unit and a processing unit, wherein the image acquisition unit is connected with the processing unit; the first light source outputs a first light beam, the second light source outputs a second light beam, and the first light beam and the second light beam pass through different optical paths and are partially transmitted to a first position of a to-be-detected lens in a common optical path, and are refracted by the to-be-detected lens and then incident to the same position of the image acquisition unit; and the processing unit determines the diopter of the first position according to the transmission matrix of the first light beam and the second light beam. The lens measuring device provided by the embodiment of the invention is based on a light field technology, and can accurately measure the diopter of each point on a spectacle lens with a micro-lens structure in a relatively simple and low-cost manner.

Description

Technical Field

[0001] The present invention relates to the field of optical measurement technology, and in particular to a lens measurement device and method. Background Art

[0002] With the continuous development of eyeglass manufacturing technology, frame lenses with microlens structures for controlling children's myopia have emerged. This type of lens has microlenses with a diameter of about 1mm distributed on the surface, and its structural complexity exceeds that of traditional frame glasses and progressive focus glasses.

[0003] Existing eyewear testing technologies, such as traditional electronic ophthalmometers and automatic ophthalmometers, have difficulty accurately locating and measuring the diopter of each tiny area on such lenses. This is mainly because these devices have difficulty accurately measuring the optical performance of specific points on the lens. In addition, high-precision professional testing equipment is expensive and cannot meet the needs of large-scale applications.

[0004] Therefore, there is an urgent need for a detection device with simple structure, low cost and reliable accuracy, which can effectively measure the refractive power of each point on a spectacle lens with a microlens structure. Summary of the invention

[0005] The embodiments of the present invention provide a lens measuring device and method. The lens measuring device is based on light field technology and can accurately measure the diopter of each point on a spectacle lens with a microlens structure in a relatively simple and low-cost manner.

[0006] According to one aspect of the present invention, there is provided a lens measuring device, comprising a first light source, a second light source, an image acquisition unit and a processing unit, wherein the image acquisition unit is connected to the processing unit;

[0007] The first light source outputs a first light beam, and the second light source outputs a second light beam. The first light beam and the second light beam are transmitted to a first position of the lens to be tested through different optical paths and partially share a common optical path, and are incident on the same position of the image acquisition unit after being refracted by the lens to be tested;

[0008] The processing unit determines the diopter of the first position according to a transmission matrix of the first light beam and the second light beam.

[0009] Optionally, the first light source is a first pixel on a first display, and the second light source is a second pixel on a second display, and the first pixel and the second pixel have different luminous colors.

[0010] Optionally, the first display, the second display, the lens to be tested and the image acquisition unit are sequentially arranged on a common optical axis.

[0011] Optionally, it also includes a first semi-transparent and semi-reflective mirror;

[0012] The first display, the lens to be tested and the image acquisition unit are sequentially arranged on a common optical axis;

[0013] The second display is located between the first display and the lens to be tested and is arranged in a direction perpendicular to the plane where the first display is located. The first light beam is incident on the first position of the lens to be tested after being transmitted through the first semi-transparent and semi-reflective mirror. The second light beam is incident on the first position of the lens to be tested after being reflected through the first semi-transparent and semi-reflective mirror.

[0014] Optionally, it further includes a first right angle prism and a second right angle prism;

[0015] The first light source is a third pixel on a third display, the second light source is a fourth pixel on the third display, and the third pixel and the fourth pixel have different luminous colors;

[0016] The first light beam is sequentially reflected by the hypotenuse of the first right-angle prism, transmitted by the first right-angle side of the first right-angle prism and the first right-angle side of the second right-angle prism, reflected by the hypotenuse of the second right-angle prism, and transmitted by the second right-angle side of the second right-angle prism, and then incident on the first position of the lens to be tested;

[0017] The second light beam is incident on the first position of the lens to be tested after being transmitted through the hypotenuse of the second right-angle prism and the second right-angle side of the second right-angle prism in sequence.

[0018] Optionally, it further includes a third light source and a fourth light source, the third light source outputs a third light beam, the fourth light source outputs a fourth light beam, the third light beam and the fourth light beam pass through different optical paths and partially share a common optical path to be incident on the same position of the image acquisition unit;

[0019] The portion of the third light beam and the fourth light beam that shares a common optical path shares a common optical path with the light of the first light beam that is refracted by the lens to be tested.

[0020] Optionally, it also includes a reflecting mirror, a second semi-transparent and semi-reflective mirror, a third semi-transparent and semi-reflective mirror, and a fourth semi-transparent and semi-reflective mirror;

[0021] The first light source is a fifth pixel on a fourth display, the second light source is a sixth pixel on the fourth display, the third light source is a seventh pixel on the fourth display, the fourth light source is an eighth pixel on the fourth display, and the plane where the fourth display is located is parallel to the optical axis of the lens to be tested;

[0022] The first light beam is reflected by the reflector and transmitted by the second semi-transparent mirror before entering the first position of the lens to be tested, and is refracted by the lens to be tested and sequentially transmitted by the third semi-transparent mirror and the fourth semi-transparent mirror before entering the image acquisition unit;

[0023] The second light beam is reflected by the second semi-transparent mirror and incident on the first position of the lens to be tested, and is refracted by the lens to be tested and sequentially transmitted through the third semi-transparent mirror and the fourth semi-transparent mirror and then incident on the image acquisition unit;

[0024] The third light beam is reflected by the third semi-transparent mirror and transmitted by the fourth semi-transparent mirror before entering the image acquisition unit;

[0025] The fourth light beam is reflected by the fourth semi-transparent mirror and then incident on the image acquisition unit.

[0026] Optionally, in the direction of the optical axis, the distance d between the first display and the second display satisfies 30mm≤d≤500mm, the distance h between the second display and the lens to be tested satisfies 10mm≤h≤500mm, and the distance Z between the lens to be tested and the image acquisition unit satisfies Z≥100mm.

[0027] According to another aspect of the present invention, a lens measuring method is provided, wherein the refractive power of a lens to be measured is measured using the lens measuring device described above, and the lens measuring method comprises:

[0028] The first light source and the second light source are arranged on a first side of the lens to be tested, and the image acquisition unit is arranged on a second side of the lens to be tested;

[0029] Control the first light source to output a first light beam and the second light source to output a second light beam, wherein the first light beam and the second light beam are transmitted to a first position of the lens to be tested through different optical paths and partially share a common optical path, and are incident on the same position of the image acquisition unit after being refracted by the lens to be tested;

[0030] The processing unit determines the diopter of the first position according to the transmission matrix of the first light beam and the second light beam.

[0031] Optionally, the method further includes: changing the positions at which the first light beam and the second light beam are incident on the lens to be tested, and determining the diopter of all positions of the lens to be tested.

[0032] The lens measuring device provided by the embodiment of the present invention includes a first light source, a second light source, an image acquisition unit and a processing unit, and the image acquisition unit is connected to the processing unit. The first light source outputs a first light beam, and the second light beam is output by the second light source. The first light beam and the second light beam are transmitted to the first position of the lens to be measured through different optical paths and part of the common optical path, and are incident on the same position of the image acquisition unit after being refracted by the lens to be measured; the refractive power of the first position is determined by the processing unit according to the transmission matrix of the first light beam and the second light beam. According to the above principle, the refractive power of all positions of the lens to be measured is repeatedly calculated, and the refractive power of each point on the eyeglass lens with a microlens structure can be accurately measured in a relatively simple and low-cost manner. The lens measuring device provided by the embodiment of the present invention has the advantages of simple structure, low cost, high measurement accuracy, etc. It is suitable for the detection needs of modern complex lenses and has broad application prospects.

[0033] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the structure of a lens measuring device provided by an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the principle of a lens measuring device provided by an embodiment of the present invention;

[0037] Figure 3 A schematic structural diagram of another lens measuring device provided by an embodiment of the present invention;

[0038] Figure 4 A schematic structural diagram of another lens measuring device provided by an embodiment of the present invention;

[0039] Figure 5 for Figure 4 A partial structural schematic diagram of a lens measuring device shown;

[0040] Figure 6 A schematic structural diagram of another lens measuring device provided by an embodiment of the present invention;

[0041] Figure 7A schematic flow chart of a lens measuring method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0044] Figure 1 A schematic diagram of the structure of a lens measuring device provided by an embodiment of the present invention, referring to Figure 1 The lens measuring device includes a first light source 10, a second light source 20, an image acquisition unit 30 and a processing unit 40, and the image acquisition unit 30 and the processing unit 40 are connected; the first light source 10 outputs a first light beam, and the second light source 20 outputs a second light beam, and the first light beam and the second light beam are transmitted to a first position of a lens to be measured 50 through different optical paths and a partially common optical path, and are incident on the same position of the image acquisition unit 30 after being refracted by the lens to be measured 50; the processing unit 40 determines the diopter of the first position according to the transmission matrix of the first light beam and the second light beam.

[0045] The first light source 10 and the second light source 20 may emit light of different colors, for example, two pixels on two displays, or pixels at different positions on the same display. The image acquisition unit 30 may be a camera. The lens 50 to be tested may be a lens including a plurality of microlenses. In other embodiments, the lens 50 to be tested may also be other lenses, such as an aspherical lens, a free-form lens, etc., which is not limited in the embodiment of the present invention.

[0046] Optional, continue to refer to Figure 1, the first light source 10 is a first pixel on the first display 100, the second light source 20 is a second pixel on the second display 200, and the first pixel and the second pixel have different luminous colors. Exemplarily, Figure 1 Taking the first pixel as a red pixel and the second pixel as a green pixel as an example is not a limitation of the embodiment of the present invention. Optionally, the first display 100, the second display 200, the lens to be tested 50 and the image acquisition unit 40 are sequentially arranged on a common optical axis.

[0047] It can be understood that, assuming that light is emitted from the camera, the light passes through a certain point on the lens to be tested, and after refraction, it passes through a beam splitter and is divided into two beams of light. The two beams of light arrive at two different areas of the display respectively. If light spots are displayed at these two positions on the display, since the light path is reversible, the two light spots coincide in the image captured by the camera. Therefore, adjust the pixel positions of the two areas on the display until the two pixels coincide at the same position in the image captured by the camera. Record the position of the pixel points, and use the light transmission matrix and related formulas to calculate the refractive power of the point on the lens to be tested. Based on the above principles, Figure 2 This is a schematic diagram of the principle of the lens measuring device provided by the embodiment of the present invention, referring to Figure 2 (a), the first light source 10, the second light source 20 and the image acquisition unit 30 are arranged in sequence, and the lens to be tested is not set at this time. Assuming that the first display 100 and the second display 200 are two semi-transparent displays aligned in parallel, through the image acquisition unit 30, when the first pixel and the second pixel displayed on the two displays are aligned with the image acquisition unit 30, the image acquisition unit 30 can see that the first pixel and the second pixel on the two displays overlap at one point. Figure 2 (b), add the lens 50 to be tested, and assume that it can be seen from the image acquisition unit 30 that the light is deflected, and the points on the display are displaced and no longer overlap. Figure 2 (c) Adjust the positions of the two pixels on the display to realign them so that the two points overlap on the image acquisition unit 30. Record the positions of the two pixels and use the light transmission matrix and related formulas to calculate the diopter of the point on the lens 50 to be tested.

[0048] Specifically, refer to Figure 1 , the distance between the two displays is d, the distance between the second display 200 and the lens to be tested 50 is h, the coordinate of the position of the point to be tested is X, the distance between the lens to be tested 50 and the image acquisition unit 30 is Z, and the coordinate of the first light source 10 is X b , the coordinate of the second light source 20 is X a , according to the light transmission matrix:

[0049]

[0050] Solving it gives:

[0051]

[0052] The above is the case of parallel light, and the image acquisition unit 30 only observes one point on the lens 50 to be tested.

[0053] For the choice of display, you can choose a common consumer-grade display with a resolution of about 100 PPI (Pixel Per Inch) to 200 PPI and a pixel pitch of 0.15 mm to 0.25 mm; you can also choose a common mobile phone screen with a resolution of about 300 PPI to 500 PPI and a pixel pitch of 0.05 mm to 0.08 mm. The minimum change angle of light that can be resolved is θ, tan(θ) = (X a -X b ) / d, about 5e-4~1e-3, that is, θ is in [0.0286°, 0.0573°], which is sufficient for measurement accuracy. Optionally, in the direction of the optical axis, the distance d between the first display 100 and the second display 200 satisfies 30mm≤d≤500mm, and h has little effect on the measurement. Optionally, the distance h between the second display 200 and the lens to be measured 50 satisfies 10mm≤h≤500mm. When (X a -X b ) is small, the larger Z is, the smaller the error is. However, limited by the actual size, the distance Z between the lens to be tested 50 and the image acquisition unit 30 can be set to satisfy Z≥100mm, preferably above 400mm.

[0054] When the image acquisition unit can observe any point on the lens, the pinhole camera model can be used to track the optical path. According to the above principle, the diopter of all positions of the lens to be tested can be realized. In the specific implementation, in order to speed up the measurement speed, specific patterns can also be displayed on two displays respectively, and multiple positions on the lens to be tested can be measured simultaneously by comparing the patterns. These patterns can be grids, stripes, dot matrices or other regular shapes. Since the pattern is just a collection of points, its basic principle is the same as the above principle. These patterns are refracted in the lens to be tested, thereby forming a deformed pattern image in the camera. By analyzing the difference in the degree of deformation of the two images, the diopter distribution of the lens to be tested can be calculated.

[0055] In actual implementation, transparent displays may be costly and difficult to implement. Figure 3A schematic structural diagram of another lens measuring device provided in an embodiment of the present invention. Optionally, the lens measuring device further includes a first semi-transparent and semi-reflective mirror 60; a first display 100, a lens to be measured 50 and an image acquisition unit 30 are arranged in sequence on a common optical axis; a second display 200 is located between the first display 100 and the lens to be measured 50 and is arranged in a direction perpendicular to the plane where the first display 100 is located, a first light beam is transmitted through the first semi-transparent and semi-reflective mirror 60 and is incident on a first position of the lens to be measured 50, and a second light beam is reflected through the first semi-transparent and semi-reflective mirror 60 and is incident on the first position of the lens to be measured 50.

[0056] It is understandable that under current technical conditions, the cost of translucent display devices is relatively high. By setting a first semi-transparent and semi-reflective mirror 60, the horizontally set second display 200 can be changed to a vertical setting to prevent the second display 200 from blocking the light of the first display 100. The basic principle is similar to that of the aforementioned embodiment and will not be described in detail here.

[0057] In another embodiment, in order to further reduce the cost, two pixels in different areas of the same display may be used to form the first light source and the second light source. Figure 4 A schematic diagram of another lens measuring device provided by an embodiment of the present invention, referring to Figure 4 Optionally, the lens measuring device further includes a first right-angle prism 70 and a second right-angle prism 80; the first light source 10 is a third pixel on the third display 300, and the second light source 20 is a fourth pixel on the third display 300, and the light emission colors of the third pixel and the fourth pixel are different; the first light beam is sequentially reflected by the hypotenuse of the first right-angle prism 70, transmitted by the first right-angle side of the first right-angle prism 70 and the first right-angle side of the second right-angle prism 80, reflected by the hypotenuse of the second right-angle prism 80, and transmitted by the second right-angle side of the second right-angle prism 80, and then incident on the first position of the lens to be measured 50; the second light beam is sequentially transmitted by the hypotenuse of the second right-angle prism 80 and the second right-angle side of the second right-angle prism 90, and then incident on the first position of the lens to be measured 50.

[0058] It should be noted that the light beams illustrated in this embodiment do not take into account the refraction of the light beams by the right-angle prism, and only schematically illustrate the overall direction of the light beam transmission. In specific implementation, the calculation of the diopter of the lens 50 to be tested may need to take into account the refraction of the light beams, and only the corresponding transmission matrix needs to be adjusted. Only the basic principle is shown here.

[0059] When the first light source and the second light source use two areas of the same display, the variable parameter that needs to be recorded is the distance Δ between two pixels, and its calculation formula has a deformation. For example, Figure 5 for Figure 4 The partial structure diagram of the lens measuring device shown in FIG. b +dXa =d-(X a -X b ), according to the light transmission matrix, we can get

[0060] The technical solution of the embodiment of the present invention has the following advantages:

[0061] 1) Simple equipment:

[0062] It only requires common components such as a display, a beam splitter and a camera. It has a simple structure and is easy to assemble and maintain. It has no moving mechanical parts and is highly stable.

[0063] 2) Low cost: Uses consumer-grade displays and cameras to reduce equipment costs; can be widely used in eyewear manufacturing and optometry institutions.

[0064] 3) High precision: Through precise optical path design and control, high-precision measurement of microlens structure can be achieved to meet the needs of modern complex lens detection.

[0065] 4) Strong flexibility: The device structure can be adjusted according to actual needs and is suitable for different types of lenses.

[0066] In one embodiment, in order to reduce the influence of ambient light on the measurement, the lens measurement device can be optionally enclosed in a relatively closed environment, with only an opening for placing the lens to be measured. Alternatively, a pure color that is not common in ambient light (such as red or green of a specific wavelength) can be used on the display to improve the recognition of the signal. The specific implementation can be designed according to the actual situation.

[0067] In another embodiment, a double-sided optical path tracking solution can also be used. Optionally, a semi-transparent and semi-reflective mirror can be added to both sides of the lens to be tested, and the incident and outgoing light of the lens can be tracked simultaneously. This can achieve better accuracy. And it does not require the camera to be aligned with the center of the lens, and there is no requirement for the posture of the camera. For example, Figure 6 A schematic diagram of the structure of another lens measuring device provided by an embodiment of the present invention, referring to Figure 6 Optionally, the lens measuring device further includes a third light source 11 and a fourth light source 21, the third light source 11 outputs a third light beam, the fourth light source 21 outputs a fourth light beam, the third light beam and the fourth light beam pass through different optical paths and partially share a common optical path and are incident on the same position of the image acquisition unit 30; wherein the portion of the third light beam and the fourth light beam that shares a common optical path shares a common optical path with the light of the first light beam after being refracted by the lens 50 to be measured.

[0068] In specific implementation, in order to reduce costs, the four light sources can be set at different positions of the same display. Figure 6Optionally, the lens measuring device further includes a reflector 61, a second semi-transparent mirror 62, a third semi-transparent mirror 63 and a fourth semi-transparent mirror 64; the first light source 10 is the fifth pixel on the fourth display 400, the second light source 20 is the sixth pixel on the fourth display 400, the third light source 11 is the seventh pixel on the fourth display 400, the fourth light source 21 is the eighth pixel on the fourth display 400, and the plane where the fourth display 400 is located is parallel to the optical axis of the lens to be measured 50; the first light beam is reflected by the reflector 61 and transmitted by the second semi-transparent mirror 62 and then incident on the first position of the lens to be measured 50 , after being refracted by the lens to be tested 50, it is transmitted through the third semi-transparent mirror 63 and the fourth semi-transparent mirror 64 in sequence and then incident on the image acquisition unit 30; the second light beam is reflected by the second semi-transparent mirror 62 and then incident on the first position of the lens to be tested 50, after being refracted by the lens to be tested 50, it is transmitted through the third semi-transparent mirror 63 and the fourth semi-transparent mirror 64 in sequence and then incident on the image acquisition unit 30; the third light beam is reflected by the third semi-transparent mirror 63, transmitted through the fourth semi-transparent mirror 64 and then incident on the image acquisition unit 30; the fourth light beam is reflected by the fourth semi-transparent mirror 64 and then incident on the image acquisition unit 30.

[0069] Figure 7 FIG. 1 is a flow chart of a lens measuring method provided in an embodiment of the present invention. The lens measuring method uses any one of the lens measuring devices provided in the above embodiments to measure the diopter of the lens to be measured. Figure 7 , lens measurement methods include:

[0070] S110, disposing a first light source and a second light source on a first side of the lens to be tested, and disposing an image acquisition unit on a second side of the lens to be tested.

[0071] Among them, the first light source and the second light source are arranged on the light incident side of the lens to be tested, and the image acquisition unit is arranged on the light exit side of the lens to be tested. In specific implementation, the first light source and the second light source can be pixels located on two displays, or two pixels located at different positions of the same display. In specific implementation, it can be designed according to actual conditions to determine the Z, h, and d parameters in the calculation formula.

[0072] S120, controlling the first light source to output a first light beam and the second light source to output a second light beam, the first light beam and the second light beam are transmitted to a first position of the lens to be tested through different optical paths and a partially common optical path, and are incident on the same position of the image acquisition unit after being refracted by the lens to be tested.

[0073] When the above conditions are met, the coordinates X of the first position and the position coordinates X of the two light sources are calibrated in the image captured by the image acquisition unit. a and X b .

[0074] S130: The processing unit determines the diopter of the first position according to the transmission matrix of the first light beam and the second light beam.

[0075] The above describes the process of measuring using two pixel points. To speed up the measurement, specific patterns can also be displayed on two displays respectively, and multiple sites on the lens to be tested can be measured simultaneously by comparing the patterns. These patterns can be grids, stripes, dot matrix or other regular shapes. Since the pattern is just a collection of points, its basic principle has actually been described above. These patterns are refracted by the lens to be tested, thereby forming a deformed pattern image in the camera. By analyzing the difference in the degree of deformation of the two images, the refractive power distribution of the lens to be tested can be calculated.

[0076] On the basis of the above, optionally, the method further includes: S140, changing the positions where the first light beam and the second light beam are incident on the lens to be tested, and determining the diopter of all positions of the lens to be tested.

[0077] In practical applications, more advanced algorithms can be used to improve measurement speed and accuracy. For example, image processing technology or optimized iterative algorithms can be used to speed up the process of adjusting pixel positions.

[0078] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lens measuring device, characterized in that: It includes a first light source, a second light source, an image acquisition unit and a processing unit, wherein the image acquisition unit is connected to the processing unit; The first light source outputs a first light beam, and the second light source outputs a second light beam. The first light beam and the second light beam are transmitted to a first position of the lens to be tested through different optical paths and partially share a common optical path, and are incident on the same position of the image acquisition unit after being refracted by the lens to be tested; The processing unit determines the diopter of the first position according to a transmission matrix of the first light beam and the second light beam.

2. The lens measuring device according to claim 1, characterized in that: The first light source is a first pixel on a first display, the second light source is a second pixel on a second display, and the first pixel and the second pixel have different luminous colors.

3. The lens measuring device according to claim 2, characterized in that: The first display, the second display, the lens to be tested and the image acquisition unit are sequentially arranged on a common optical axis.

4. The lens measuring device according to claim 2, characterized in that: Also included is a first semi-transparent and semi-reflective mirror; The first display, the lens to be tested and the image acquisition unit are sequentially arranged on a common optical axis; The second display is located between the first display and the lens to be tested and is arranged in a direction perpendicular to the plane where the first display is located. The first light beam is incident on the first position of the lens to be tested after being transmitted through the first semi-transparent and semi-reflective mirror. The second light beam is incident on the first position of the lens to be tested after being reflected through the first semi-transparent and semi-reflective mirror.

5. The lens measuring device according to claim 1, characterized in that: Also included is a first right angle prism and a second right angle prism; The first light source is a third pixel on a third display, the second light source is a fourth pixel on the third display, and the third pixel and the fourth pixel have different luminous colors; The first light beam is sequentially reflected by the hypotenuse of the first right-angle prism, transmitted by the first right-angle side of the first right-angle prism and the first right-angle side of the second right-angle prism, reflected by the hypotenuse of the second right-angle prism, and transmitted by the second right-angle side of the second right-angle prism, and then incident on the first position of the lens to be tested; The second light beam is incident on the first position of the lens to be tested after being transmitted through the hypotenuse of the second right-angle prism and the second right-angle side of the second right-angle prism in sequence.

6. The lens measuring device according to claim 1, characterized in that: It also includes a third light source and a fourth light source, the third light source outputs a third light beam, the fourth light source outputs a fourth light beam, the third light beam and the fourth light beam pass through different optical paths and partially share a common optical path and are incident on the same position of the image acquisition unit; The portion of the third light beam and the fourth light beam that shares a common optical path shares a common optical path with the light of the first light beam that is refracted by the lens to be tested.

7. The lens measuring device according to claim 6, characterized in that: Also includes a reflecting mirror, a second semi-transparent and semi-reflective mirror, a third semi-transparent and semi-reflective mirror, and a fourth semi-transparent and semi-reflective mirror; The first light source is a fifth pixel on a fourth display, the second light source is a sixth pixel on the fourth display, the third light source is a seventh pixel on the fourth display, the fourth light source is an eighth pixel on the fourth display, and the plane where the fourth display is located is parallel to the optical axis of the lens to be tested; The first light beam is reflected by the reflector and transmitted by the second semi-transparent mirror before entering the first position of the lens to be tested, and is refracted by the lens to be tested and sequentially transmitted by the third semi-transparent mirror and the fourth semi-transparent mirror before entering the image acquisition unit; The second light beam is reflected by the second semi-transparent mirror and incident on the first position of the lens to be tested, and is refracted by the lens to be tested and sequentially transmitted through the third semi-transparent mirror and the fourth semi-transparent mirror and then incident on the image acquisition unit; The third light beam is reflected by the third semi-transparent mirror and transmitted by the fourth semi-transparent mirror before entering the image acquisition unit; The fourth light beam is reflected by the fourth semi-transparent mirror and then incident on the image acquisition unit.

8. The lens measuring device according to claim 3, characterized in that: In the direction of the optical axis, the distance d between the first display and the second display satisfies 30mm≤d≤500mm, the distance h between the second display and the lens to be tested satisfies 10mm≤h≤500mm, and the distance Z between the lens to be tested and the image acquisition unit satisfies Z≥100mm.

9. A lens measuring method, characterized in that: The refractive power of a lens to be measured is measured using the lens measuring device according to any one of claims 1 to 8, wherein the lens measuring method comprises: The first light source and the second light source are arranged on a first side of the lens to be tested, and the image acquisition unit is arranged on a second side of the lens to be tested; Control the first light source to output a first light beam and the second light source to output a second light beam, wherein the first light beam and the second light beam are transmitted to a first position of the lens to be tested through different optical paths and partially share a common optical path, and are incident on the same position of the image acquisition unit after being refracted by the lens to be tested; The processing unit determines the diopter of the first position according to the transmission matrix of the first light beam and the second light beam.

10. The lens measuring method according to claim 9, characterized in that: Also includes: The positions at which the first light beam and the second light beam are incident on the lens to be tested are changed to determine the diopter of all positions of the lens to be tested.

Images