Aperture external lens module and test equipment

Abstract

The embodiment of the present application provides an aperture external lens module and a testing device; the aperture external lens module includes an aperture, a lens and a receiving chip; the lens includes a first lens group, a second lens group and a third lens group; the first lens group is located on the side close to the aperture, including a first lens, a second lens, a third lens and a fourth lens, the third lens and the fourth lens are glued to form a first double-cemented lens, and the optical focal length of the first lens group is positive; the second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; the third lens group is located on one side of the receiving chip, including an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens and a fifteenth lens, the twelfth lens and the thirteenth lens are glued to form a second double-cemented lens; the air gap between the first lens group and the second lens group is L1, the air gap between the second lens group and the third lens group is L2, and the air gap between the second lens group and the third lens group is L3. <L1 / L2<2.7。

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical testing technology. More specifically, the embodiments of the present application relate to an aperture external lens module and testing equipment. Background Art

[0002] With the development of augmented reality (AR) technology, the performance and application scenarios of AR products are constantly expanding, placing higher demands on the accuracy of AR product testing equipment. As a key component in ensuring AR product quality, the performance of its core component—the lens—directly determines the accuracy of test results. However, traditional test equipment lenses currently on the market suffer from numerous design and application deficiencies, making them unable to meet the high standards required for AR product testing.

[0003] First, traditional test lenses often use an internal aperture design, which is difficult to match with the external aperture architecture used in AR products. The unique nature of AR products requires that test lenses also have the ability to have an external aperture to ensure consistency between the test environment and the actual use environment, thereby accurately evaluating the performance of AR products. However, compared to ordinary lenses, the external aperture design places higher demands on optical design, manufacturing process, and assembly precision, increasing the complexity of design and production.

[0004] Secondly, a wide field of view (FOV) and low distortion are crucial performance indicators in AR product testing, but both are often difficult to achieve in traditional lens design. A wide FOV captures a wider range of scene information, while low distortion ensures image authenticity and accuracy. However, while traditional lenses expand the FOV, they often struggle to effectively control distortion, resulting in distorted test results and hindering the accurate evaluation of AR product performance.

[0005] Furthermore, lens selection and processing costs are significant factors limiting the performance of test equipment. While aspherical lenses offer excellent image quality, their high processing costs limit their use in test equipment. Spherical lenses, while relatively inexpensive, struggle to meet high-performance requirements such as wide field of view and low distortion, making them difficult to meet the high image quality standards required for AR product testing. Summary of the Invention

[0006] The purpose of this application is to provide a new technical solution for an aperture external lens module and testing equipment.

[0007] In a first aspect, an embodiment of the present application provides an aperture external lens module, wherein the aperture external lens module includes an aperture, a lens, and a receiving chip arranged in sequence;

[0008] The lens comprises a first lens group, a second lens group and a third lens group in sequence along the optical axis direction;

[0009] The first lens group is located on a side close to the aperture, and includes a first lens, a second lens, a third lens, and a fourth lens. The third lens and the fourth lens are cemented together to form a first doublet lens. The optical power of the first lens group is positive.

[0010] The second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens;

[0011] The third lens group is located on one side of the receiving chip, and includes an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, and a fifteenth lens. The twelfth lens and the thirteenth lens are glued together to form a second doublet lens.

[0012] The air gap between the first lens group and the second lens group is L1, and the air gap between the second lens group and the third lens group is L2. <L1 / L2<2.7。

[0013] Optionally, in the first lens group: the first lens has a negative optical power, and the second lens and the first doublet lens both have a positive optical power;

[0014] In the second lens group, the fifth lens, the sixth lens, and the tenth lens all have positive refractive power, and the seventh lens, the eighth lens, and the ninth lens all have negative refractive power;

[0015] In the third lens group, the eleventh lens has negative optical power, and the second doublet lens, the fourteenth lens, and the fifteenth lens all have positive optical power.

[0016] Optionally, in the first doublet lens: the third lens has positive focal power, and the fourth lens has negative focal power;

[0017] In the second doublet lens, the twelfth lens has negative optical power, and the thirteenth lens has positive optical power.

[0018] Optionally, a ratio of a center thickness T' of the first doublet lens to a total optical length TTL of the external aperture lens module satisfies: 6.8%<T' / TTL<8.2%.

[0019] Optionally, a ratio of a center thickness T5 of the fifth lens to a total optical length TTL of the external aperture lens module satisfies: 10%<T5 / TTL<12.5%.

[0020] Optionally, the sag height of the surface of the fifth lens close to the aperture at the maximum aperture is S1, the sag height of the surface of the fifth lens away from the aperture at the maximum aperture is S2, and the ratio of S2 to S1 satisfies: 5.5 <S2 / S1<6.4。

[0021] Optionally, in the third lens group: the eleventh lens, the twelfth lens, the thirteenth lens, and the fourteenth lens are sequentially and closely arranged;

[0022] The ratio of the center thickness T15 of the fifteenth lens to the total optical length TTL of the aperture external lens module satisfies: 7.5%<T15 / TTL<9.5%.

[0023] Optionally, a center thickness T1 of the first lens, a center thickness T2 of the second lens, a center thickness T5 of the fifth lens, and a center thickness T6 of the sixth lens satisfy the following relationship: 5<(T5+T6) / (T1+T2)<7.

[0024] Optionally, a center thickness T7 of the seventh lens, a center thickness T8 of the eighth lens, a center thickness T9 of the ninth lens, and a center thickness T10 of the tenth lens satisfy the following relationship: 2<(T7+T9) / (T8+T10)<3.5.

[0025] Optionally, the center thickness T11 of the eleventh lens, the center thickness T12 of the twelfth lens, the center thickness T13 of the thirteenth lens, the center thickness T14 of the fourteenth lens, and the center thickness T15 of the fifteenth lens satisfy the following relationship: 3.5<(T11+T13+T14) / (T12+T15)<5.5.

[0026] Optionally, the angle between the tangent line of the first lens at the maximum aperture and the optical axis is A1, and the angle between the tangent line of the first lens at the maximum aperture and the optical axis is A2, and the following relationship is satisfied between A1 and A2: 50°<(A1+A2) / 2<70° and 1 <A2 / A1<1.3。

[0027] Optionally, the angle between the lens tangent of the surface of the ninth lens away from the aperture at the maximum aperture and the optical axis is A3, the angle between the lens tangent of the surface of the ninth lens close to the aperture at the maximum aperture and the optical axis is A4, and the following relationship is satisfied between A3 and A4: 57°<(A3+A4) / 2<67° and 0.85 <A3 / A4<1.15。

[0028] Optionally, the angle between the lens tangent of the surface of the tenth lens close to the aperture at the maximum aperture and the optical axis is A5, the angle between the lens tangent of the surface of the tenth lens away from the aperture at the maximum aperture and the optical axis is A6, and the angle between A5 and A6 satisfies: 1.65 <A6 / A5<2.05。

[0029] Optionally, the ratio of the total optical length TTL of the external aperture lens module to the maximum aperture D1 of the lens in the lens satisfies: 4.4<TTL / D1<5.6.

[0030] Optionally, the effective focal length of each lens in the lens is:

[0031] The effective focal length of the first lens is F1, -140mm≤F1≤-120mm;

[0032] The effective focal length of the second lens is F2, 17mm≤F2≤20mm;

[0033] The effective focal length of the first doublet lens is F', 100 mm ≤ F' ≤ 110 mm;

[0034] The effective focal length of the fifth lens is F5, 45mm≤F5≤60mm;

[0035] The effective focal length of the sixth lens is F6, 22mm≤F6≤29mm;

[0036] The effective focal length of the seventh lens is F7, -50mm≤F7≤-33mm;

[0037] The effective focal length of the eighth lens is F8, -16mm≤F8≤-13mm;

[0038] The effective focal length of the ninth lens is F9, -150mm≤F9≤-130mm;

[0039] The effective focal length of the tenth lens is F10, 11mm≤F10≤14mm;

[0040] The effective focal length of the eleventh lens is F11, -7mm≤F11≤-5mm;

[0041] The effective focal length of the second doublet lens is F'', 13mm≤F''≤15mm;

[0042] The effective focal length of the fourteenth lens is F14, 22mm≤F14≤28mm;

[0043] The effective focal length of the fifteenth lens is F15, 17mm≤F15≤23mm;

[0044] The first lens to the fifteenth lens are all spherical lenses.

[0045] In a second aspect, an embodiment of the present application provides a testing device, the testing device comprising:

[0046] The external aperture lens module as described in the first aspect.

[0047] The beneficial effects of this application are as follows:

[0048] The diaphragm-external lens module provided by the embodiment of this application, by setting the diaphragm outside the lens, matches the diaphragm-external optical architecture of the AR product's light engine and optical waveguide device, effectively simulates the actual usage environment of the AR product, and improves the accuracy and reliability of the test results.

[0049] The diaphragm-external lens module provided by the embodiment of this application, in which the lens is sequentially divided into a first lens group, a second lens group, and a third lens group along the optical axis direction. This grouping design helps to achieve complex optical performance requirements. The first lens group is located on the side close to the diaphragm and adopts a positive optical power design, which is beneficial for the convergence and correction of light rays; the second lens group and the third lens group further optimize the light ray propagation path to ensure that the light rays can be accurately focused on the receiving chip. Moreover, in the first lens group, the third lens and the fourth lens are glued together to form a first doublet lens, and in the third lens group, the twelfth lens and the thirteenth lens are glued together to form a second doublet lens. The use of doublet lenses helps to correct chromatic aberration, improve the imaging quality, and simplify the lens structure at the same time.

[0050] In addition, the air gap between the first lens group and the second lens group is L1, and the air gap between the second lens group and the third lens group is L2, and they satisfy the proportional relationship of 2 < L1 / L2 < 2.7. This optimized design helps to balance the light ray propagation between the lens groups, reduce the reflection and scattering of light rays between the lens groups, and further improve the clarity and contrast of the imaging.

[0051] Through the following detailed description of the exemplary embodiments of this specification with reference to the accompanying drawings, other features and advantages of this specification will become clear. BRIEF DESCRIPTION OF THE DRAWINGS [[ID=?]] [[ID=?]]

[0052] The drawings incorporated in the specification and constituting a part of the specification illustrate the embodiments of this specification, and together with the description are used to explain the principles of this specification.

[0053] Figure 1 It is a schematic diagram of the optical architecture of the diaphragm-external lens module provided by the embodiment of this application;

[0054] Figure 2 It is a partial structural schematic diagram of the first lens provided by the embodiment of this application;

[0055] Figure 3 It is a partial structural schematic diagram of the ninth lens provided by the embodiment of this application;

[0056] Figure 4 It is a partial structural schematic diagram of the tenth lens provided by the embodiment of this application;

[0057] Figure 5The structure and optical path diagram of the external aperture lens module provided in Example 1 of the present application;

[0058] Figure 6 The structure and optical path diagram of the external aperture lens module provided in Example 2 of the present application;

[0059] Figure 7 The structure and optical path diagram of the external aperture lens module provided in Example 3 of the present application;

[0060] Figure 8 The structure and optical path diagram of the external aperture lens module provided in Example 4 of the present application;

[0061] Figure 9 Distortion diagram of the external aperture lens module provided in an embodiment of the present application;

[0062] Figure 10 This is the MTF diagram of the aperture external lens module provided in the embodiment of the present application.

[0063] Description of reference numerals:

[0064] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens; 8. Eighth lens; 9. Ninth lens; 10. Tenth lens; 11. Eleventh lens; 12. Twelfth lens; 13. Thirteenth lens; 14. Fourteenth lens; 15. Fifteenth lens; 16. Aperture; 17. Receiving chip. DETAILED DESCRIPTION

[0065] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0066] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0067] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0068] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0069] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0070] The following describes in detail the aperture external lens module and testing equipment provided in the embodiments of the present application in conjunction with the accompanying drawings.

[0071] According to one embodiment of the present application, a lens module with an external aperture is provided. Figure 1 , the aperture external lens module includes an aperture 16, a lens and a receiving chip 17 arranged in sequence; wherein, the lens includes a first lens group, a second lens group and a third lens group in sequence along the optical axis direction. The first lens group is located on the side close to the aperture 16, and includes a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4. The third lens 3 and the fourth lens 4 are glued to form a first double-cemented lens, and the optical focal length of the first lens group is positive. The second lens group includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10. The third lens group is located on one side of the receiving chip 17, and includes an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14 and a fifteenth lens 15. The twelfth lens 12 and the thirteenth lens 13 are glued to form a second double-cemented lens. The air gap between the first lens group and the second lens group is L1, and the air gap between the second lens group and the third lens group is L2, 2 <L1 / L2<2.7。

[0072] The aperture external lens module provided in the embodiment of the present application includes multiple key optical components and optical parameter designs. The following is a detailed analysis of these optical components and optical parameter designs.

[0073] The diaphragm external lens module provided in the embodiment of the present application is designed to set an diaphragm 16 on the outside of the lens, see Figure 1 The aperture 16 can be used to control the amount of light entering the lens and is an important element in optical design.

[0074] It should be noted that the external aperture design means that the aperture is located outside the lens. This design can match the specific architecture of AR products and ensure the consistency between the test environment and the actual usage environment.

[0075] In other words, the aperture 16 is set outside the lens, matching the external aperture structure of the AR product optical machine and optical waveguide components. This design ensures that the test equipment can more accurately simulate the actual use environment of the AR product, thereby improving the accuracy and reliability of the test results.

[0076] The aperture-external lens module provided in the embodiments of the present application includes the aforementioned lens. For example, the lens is designed to include only 15 spherical lenses. Furthermore, these 15 spherical lenses are divided into a first lens group, a second lens group, and a third lens group. This grouping helps achieve complex optical performance requirements while facilitating lens assembly and commissioning.

[0077] The first lens group is located on a side close to the external aperture 16 .

[0078] Specifically, the first lens assembly comprises a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4. A particularly unique design is that the third lens 3 and the fourth lens 4 are cemented together to form a first doublet. The use of this first doublet helps correct chromatic aberration and improve image quality.

[0079] In addition, the overall optical power of the first lens group is positive, which means that it has a converging effect on light.

[0080] Specifically, the optical focal length of the first lens group (the lens group close to the aperture 16) is positive. This design is conducive to the initial convergence and correction of light, so that the light is optimized to a certain extent before entering the subsequent lens groups, thereby improving the overall imaging quality.

[0081] Wherein, the second lens group is located between the first lens group and the third lens group.

[0082] Specifically, the second lens group comprises a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10. This lens group is responsible for further correcting aberrations and optimizing the light propagation path.

[0083] The third mirror group is located on one side of the receiving chip 17 .

[0084] Specifically, the third lens group comprises an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, and a fifteenth lens 15. A more special design is that the twelfth lens 12 and the thirteenth lens 13 are cemented together to form a second doublet lens, which can be used to correct chromatic aberration.

[0085] It should be noted that in the lens provided in the embodiment of the present application, the third lens 3 and the fourth lens 4 in the first lens group are cemented together to form a first doublet, and the twelfth lens 12 and the thirteenth lens 13 in the third lens group are cemented together to form a second doublet. In the embodiment of the present application, the use of this doublet helps correct chromatic aberration and reduce the dispersion of light during propagation, thereby improving image clarity and color reproduction.

[0086] In the diaphragm-external lens module provided by the embodiments of the present application, the receiving chip 17, such as an image sensor or a sensor, is an indispensable component of the entire module. Its function is to convert the optical signal after being focused by the lens into an electrical signal, and then form a digital image for processing.

[0087] In the diaphragm-external lens module provided by the embodiments of the present application, the receiving chip 17 is located at the end of the lens, adjacent to the third lens group, and is the final landing point of the light after optical processes such as refraction, reflection, and convergence by the lens.

[0088] In the diaphragm-external lens module provided by the embodiments of the present application, the lens is designed to sequentially include a first lens group, a second lens group, and a third lens group along the optical axis direction, and the lens groups are separated by an air gap. Specifically, there is an air gap between the first lens group and the second lens group, denoted as L1; similarly, there is also an air gap between the second lens group and the third lens group, denoted as L2.

[0089] Furthermore, in the embodiments of the present application, a constraint is imposed on the proportional relationship between the air gaps L1 and L2, that is, the condition 2 < L1 / L2 < 2.7 is satisfied. From the perspective of optical principles, the existence of the air gap has a significant impact on the propagation path of light and the imaging quality. By reasonably designing the proportional relationship between the air gaps L1 and L2, the propagation path of light between the lens groups can be effectively optimized, and the reflection and scattering phenomena during the propagation process can be reduced. Specifically, when the proportional relationship between L1 and L2 satisfies 2 < L1 / L2 < 2.7, the propagation of light between the lens groups will be smoother, and the light loss will be effectively controlled, thereby contributing to improving the clarity and contrast of the image.

[0090] In addition, the setting of this proportional relationship also takes into account the overall structure and assembly process of the lens module. While ensuring the optical performance, by reasonably adjusting the proportional relationship of the air gap, the assembly of the lens module can be made more convenient, and it also helps to reduce the assembly cost and improve the production efficiency.

[0091] In the diaphragm-external lens module provided by the embodiments of the present application, the proportional relationship between the air gaps L1 and L2 between the first lens group and the second lens group and between the second lens group and the third lens group is set to 2 < L1 / L2 < 2.7. This design not only helps to optimize the propagation path of light between the lens groups, reduce reflection and scattering phenomena, but also can improve the imaging quality, reduce the assembly cost, and improve the production efficiency.

[0092] According to the diaphragm-external lens module provided by the embodiments of the present application, from the perspective of the optical architecture, it adopts the physical layout of "diaphragm 16 - lens - receiving chip 17", and directly matches the optical engine waveguide structure of the AR device through the external diaphragm design, solving the core pain point that the traditional test lens (with internal diaphragm) is incompatible with the AR product architecture. Actual measurements show that this layout can significantly reduce the test error, such as at least reducing it by more than 40%.

[0093] From the grouping of the lenses therein, a three-lens-group hierarchical control design (such as the first lens group converges + the second lens group balances + the third lens group corrects) is adopted in the present application to form a complete optical regulation process. Specifically, the positive optical power design of the first lens group (or the front lens group) enables efficient collection of large-angle incident light, the six lenses of the second lens group (or the middle lens group) provide sufficient degrees of freedom for aberration adjustment, and the doublet structure in the third lens group (or the rear lens group) can ensure the flatness of the image plane.

[0094] The optical total length of the diaphragm-external lens module provided by the embodiments of the present application is only 114.3 mm, and a 75° field of view is achieved within this optical total length.

[0095] In addition, it is worth noting that in the lens provided by the present application, the first doublet lens (lens 3 + lens 4) in the first lens group and the second doublet lens (lens 12 + lens 13) in the second lens group echo each other: the first doublet lens mainly compensates for axial chromatic aberration, and the second doublet lens eliminates the lateral chromatic aberration in the marginal field of view.

[0096] [[ID=;12]]The lens provided by the present application also designs a specific lens group spacing ratio, that is, 2 < L1 / L2 < 2.7 as described above. Among them, the relatively large air gap L1 between the first lens group and the second lens group ensures the passing of wide-angle light, while the relatively small air gap L2 between the second lens group and the third lens group can enhance the aberration correction efficiency. This ratio also significantly reduces the volume of the entire module compared with the traditional design while maintaining the FOV unchanged.

[0097] In some examples of the present application, see Figure 1 , in the first lens group: the first lens 1 has a negative optical power, and the second lens 2 and the first doublet lens both have positive optical powers. In the second lens group: the fifth lens 5, the sixth lens 6, and the tenth lens 10 all have positive optical powers, and the seventh lens 7, the eighth lens 8, and the ninth lens 9 all have negative optical powers. In the third lens group: the eleventh lens 11 has a negative optical power, and the second doublet lens, the fourteenth lens 14, and the fifteenth lens 15 all have positive optical powers.

[0098] In the examples provided herein, a power distribution scheme for each lens in the lens system is designed to ensure that the external aperture lens module exhibits superior optical performance with respect to a wide field of view (e.g., a 75° FOV), low distortion, and high uniformity. By meticulously controlling the power of each lens in the lens system, the external aperture lens module in the embodiments of the present application can effectively expand the field of view, reduce image distortion, and improve overall image uniformity while maintaining high imaging quality, thereby fully meeting the high standards for lens performance required for AR product testing.

[0099] Regarding the design of the focal power distribution of each lens in the first lens group:

[0100] See also Figure 1 and Figure 2 The first lens 1 is designed to have negative optical power: the design of negative optical power helps to diverge the light to a certain extent in the early stage of entering the lens, providing space for the convergence effect of subsequent optical lenses, and at the same time helps to correct aberrations, especially spherical aberrations.

[0101] Both the second lens 2 and the first doublet are designed with positive power: these two positive-power lenses are responsible for refocusing diverging light to form a sharp image. The design of the first doublet (comprising the third lens 3 and the fourth lens 4 cemented together) is particularly helpful in correcting chromatic aberration. This is because the refractive index variations of light of different wavelengths passing through the doublet, due to the different materials, are compensated, thus reducing chromatic aberration.

[0102] See also Figure 1 The first lens group (negative power) acts as an entrance window, gently refracting wide-angle light. The second lens group (positive power) then begins to converge, avoiding the sharp deflection of marginal light rays caused by traditional positive-positive designs. The first doublet can be constructed using a low-refractive-index positive lens and a high-refractive-index negative lens. This achieves vertical axial chromatic aberration compensation and maintains the overall positive power of the first lens group within a positive power framework, meeting the 5.4mm focal length requirement for the entire external aperture lens module.

[0103] Regarding the design of the optical power distribution in the second lens group:

[0104] The fifth lens 5 , the sixth lens 6 and the tenth lens 10 are all designed to have positive refractive power: these three positive refractive power lenses continue to converge light and further optimize the imaging quality.

[0105] The seventh lens 7, the eighth lens 8 and the ninth lens 9 are all designed to have negative optical power: the insertion of these three negative optical power lenses helps to correct high-order aberrations such as field curvature and astigmatism, making the imaging in the entire field of view more uniform and clear.

[0106] In summary, the fifth lens 5 and the sixth lens 6 (both with positive power) receive and converge the light from the front group. The seventh lens 7 and the eighth lens 8 (both with negative power) expand the light beam to correct aberrations. The ninth lens 9 (with negative power) and the tenth lens 10 (with positive power) form a "negative-positive" compensation pair, which can help eliminate field curvature.

[0107] Regarding the design of the optical power distribution in the third lens group:

[0108] The eleventh lens 11 is designed to have negative optical power: as the starting lens of the third lens group, the design of negative optical power helps to further adjust the propagation path of light.

[0109] The second doublet, the fourteenth lens 14, and the fifteenth lens 15 are all designed with positive optical power: these positive optical lenses are responsible for converging the light onto the receiving chip 17. The second doublet (formed by the twelfth lens 12 and the thirteenth lens 13) again leverages the advantages of a doublet to further correct chromatic aberration and improve imaging quality.

[0110] In summary, the eleventh lens 11 (with negative power) compensates for the aberration transmitted from the second lens group → the second doublet lens (with positive power) corrects the residual chromatic aberration → the fourteenth lens 14 and the fifteenth lens 15 (both with positive power) flatten the image plane.

[0111] According to this example, through the proper distribution of optical power, the external aperture lens module can effectively correct various aberrations, including spherical aberration, chromatic aberration, field curvature, and astigmatism. Furthermore, the proper distribution of optical power also helps smooth the propagation of light within the lens, reducing reflections and scattering, and improving light utilization.

[0112] In response to the high-precision and high-efficiency requirements of AR product testing, the optical power distribution design provided in the example of this application can provide clear and accurate images to meet the testing requirements.

[0113] In some examples of the present application, in the first doublet lens, the third lens 3 has positive optical power, and the fourth lens 4 has negative optical power. In the second doublet lens, the twelfth lens 12 has negative optical power, and the thirteenth lens 13 has positive optical power.

[0114] The first doublet lens is composed of a third lens 3 and a fourth lens 4 cemented together. The optical power distribution of the first doublet lens is designed as follows: the third lens 3 has positive optical power, and the fourth lens 4 has negative optical power. This positive-negative optical power combination can be used to correct chromatic aberration. The third lens 3, as a positive lens, is responsible for converging light, while the fourth lens 4, as a negative lens, corrects the chromatic aberration introduced by the positive lens through its diverging effect, allowing light of different wavelengths to converge at the same focal point, thereby improving image clarity.

[0115] Furthermore, in the first lens assembly, the first doublet lens has positive power, wherein the third lens element 3 has positive power, and the refractive index N3 of the third lens element 3 is, for example, 1.45 to 1.55; wherein the fourth lens element 4 has negative power, and the refractive index N4 of the fourth lens element 4 is, for example, 1.96 to 2.08. This combination of a low-refractive-index positive lens and a high-refractive-index negative lens can effectively compensate for axial chromatic aberration.

[0116] The second doublet lens is composed of a twelfth lens 12 and a thirteenth lens 13 glued together. The optical power distribution design of the second doublet lens is as follows: the twelfth lens 12 has a negative optical power, and the thirteenth lens 13 has a positive optical power. This negative-positive optical power combination can further fine-tune the propagation path of light in the rear group of the lens, optimizing the imaging quality. The divergent effect of the twelfth lens 12, as a negative lens, can help correct any residual aberrations in the first and second lens groups, while the thirteenth lens 13, as a positive lens, is responsible for re-converging the light onto the receiving chip 17.

[0117] The optical power distribution design of the double-cemented lens in this application reflects precise optical considerations. Through the combination of positive and negative optical power and the use of refractive index differences, chromatic aberration and other aberrations are effectively corrected, the imaging quality is improved, and the high performance requirements of the lens module for AR product testing are met.

[0118] In some examples of the present application, the ratio of the center thickness T' of the first double cemented lens to the total optical length TTL of the aperture external lens module satisfies: 6.8%<T' / TTL<8.2%.

[0119] In the example provided herein, a specific range is set for the ratio of the center thickness T' of the first doublet (formed by the third lens 3 and the fourth lens 4 cemented together) to the total optical length TTL of the external aperture lens module: 6.8% < T' / TTL < 8.2%. This design parameter is intended to optimize the overall performance of the external aperture lens module.

[0120] As part of the front element of the external aperture lens module, the ratio of the center thickness T' to the total optical length TTL of the first doublet lens directly impacts the light propagation path and image quality. By setting this ratio within a certain range, the first doublet lens is ensured to function appropriately within the external aperture lens module, neither being too thick and heavy to cause excessive light refraction, nor too thin and light to effectively correct aberrations.

[0121] The design of the doublet lens itself is to correct aberrations such as chromatic aberration. By further controlling the center thickness T' of the first doublet lens, its refractive power for light of different wavelengths can be further optimized, thereby more effectively correcting chromatic aberration.

[0122] At the same time, this proportional relationship also helps to correct other aberrations, such as spherical aberration and coma, to improve the clarity and accuracy of imaging.

[0123] The total optical length TTL is an important parameter in the design of the lens module, which directly affects the volume and weight of the lens module.

[0124] In this example of the present application, by controlling the ratio of the center thickness T' of the first double-cemented lens to the total optical length TTL of the aperture external lens module, the overall size and weight of the aperture external lens module can be effectively controlled while ensuring the imaging quality, thereby meeting the requirements of AR product testing equipment for compactness and portability.

[0125] For example, the ratio of the center thickness T' of the first double-cemented lens to the total optical length TTL of the aperture external lens module can be controlled to be 7.2%, 6.9% or 8.1%.

[0126] In summary, by precisely controlling the ratio of the center thickness T' of the first doublet lens to the total optical length TTL, the imaging quality of the external aperture lens module can be significantly improved. The resulting image is clearer and sharper, with more accurate color reproduction, meeting the high-precision imaging requirements of AR product testing.

[0127] The proportional relationship provided in this example helps optimize the light propagation path within the aperture-external lens module, reducing reflection and scattering. Light can pass through each lens more smoothly and converge onto the receiving chip, improving light utilization and imaging efficiency.

[0128] Furthermore, by controlling the ratio of the center thickness T' of the first doublet lens to the total optical length TTL, the overall size and weight of the lens module can be effectively controlled while maintaining image quality. This makes the external aperture lens module more compact and lightweight, making it easier to integrate into AR product testing equipment and meeting its requirements for portability and space utilization.

[0129] In some examples of the present application, the ratio of the center thickness T5 of the fifth lens 5 to the total optical length TTL of the aperture external lens module satisfies: 10%<T5 / TTL<12.5%.

[0130] In the example provided herein, a specific range is set for the ratio of the center thickness T5 of the fifth lens element 5 to the total optical length TTL: 10% < T5 / TTL < 12.5%. This design decision is based on a comprehensive consideration of optical performance, aberration correction, and the overall structure of the lens module.

[0131] The fifth lens 5 is located in the middle portion of the lens, the second lens group, and is the first lens that light encounters after entering the second lens group from the first lens group. As the thickest lens in the lens, the center thickness T5 of the fifth lens 5 significantly affects not only its own optical performance but also the light propagation path and image quality of the entire second lens group and, ultimately, the entire lens.

[0132] By setting the T5 / TTL ratio, the fifth lens element 5 can be ensured to perform its proper optical function within the lens. This ratio is neither too thick to cause excessive light refraction or produce unnecessary aberrations, nor too thin to effectively contribute to light convergence and aberration correction.

[0133] Furthermore, the center thickness T5 of the fifth lens element 5 directly affects its light converging ability. By controlling this center thickness T5, the convergence path of light after passing through the fifth lens element 5 can be optimized, ensuring that the light is more accurately focused on the imaging plane, thereby reducing the field curvature caused by light deviating from the ideal convergence point.

[0134] The central thickness T5 of the fifth lens element 5 is also closely related to its aberration correction capability. By adjusting this thickness, the refractive index differences of the lens for light of different wavelengths can be modified, thereby more effectively correcting higher-order aberrations such as field curvature and astigmatism. A thicker fifth lens element 5 may provide stronger aberration correction capabilities, but it is also important to avoid overdesigning to increase other aberrations.

[0135] The reasonable ratio of the center thickness T5 of the fifth lens 5 to the total optical length helps enhance the mechanical stability of the lens. In environments such as temperature changes or mechanical vibrations, the lens can maintain good imaging performance and reduce the degradation of imaging quality caused by environmental factors.

[0136] In addition, in the lens design, the thicknesses and shapes of the lenses need to be coordinated with each other to achieve the optimal overall performance. The control of the central thickness of the fifth lens 5 is also part of this balancing process. By matching the thicknesses and shapes of other lenses, it can be ensured that while maintaining a large field of view angle and low distortion, the entire lens effectively reduces aberrations such as field curvature.

[0137] For example, T5 / TTL is 10.3%, 11.2% or 12.1%.

[0138] In summary, setting the ratio of the central thickness T5 of the fifth lens 5 to the overall optical length TTL within the range of 10% < T5 / TTL < 12.5% is based on a comprehensive consideration of optical performance, aberration correction, and the overall structure of the lens. This design not only optimizes the optical performance of the fifth lens 5 itself but also has a positive impact on the light propagation path and imaging quality of the entire lens.

[0139] In some examples of the present application, referring to Figure 1 , the sagittal height of the surface of the fifth lens 5 near the aperture 16 at the maximum aperture is S1, and the sagittal height of the surface of the fifth lens 5 far from the aperture 16 at the maximum aperture is S2. The ratio of S2 to S1 satisfies: 5.5 < S2 / S1 < 6.4.

[0140] In the examples provided by the present application, referring to [[ID=I5]] Figure 1 [[ID=I6]],the design of the fifth lens 5 takes into account the ratio of the sagittal heights of its surface near the aperture 16 (i.e., the front surface) and the surface far from the aperture 16 (i.e., the rear surface) at the maximum aperture, specifically, the ratio of S2 to S1 satisfies 5.5 < S2 / S1 < 6.4. This design is based on a comprehensive consideration of optical performance, aberration correction, and the overall structure of the lens. The following is a detailed analysis of this example.

[0141] It should be explained that the sagittal height refers to the vertical distance of the lens surface at the maximum aperture relative to a certain reference plane (such as the optical axis of the lens).

[0142] In this example of the present application, the ratio of sagittal heights S2 / S1 reflects the shape difference between the front and rear surfaces of the fifth lens 5, and this difference has an important impact on the light propagation path and imaging quality. Specifically:

[0143] The ratio of sagittal heights S2 / S1 determines the refraction angle and convergence effect of the light when passing through the fifth lens 5. An appropriate ratio of sagittal heights S2 / S1 can ensure that the light can accurately converge on the imaging plane after passing through the fifth lens 5, improving the imaging clarity.

[0144] By precisely controlling the sag ratio S2 / S1, the aberration correction capability of the fifth lens 5 can be optimized. The selection of the sag ratio is particularly important for high-order aberrations such as field curvature and astigmatism.

[0145] In this example, the sag ratio S2 / S1 also has a certain impact on the overall optical structure of the lens. Control of the sag ratio S2 / S1 is related to the overall length and aperture of the lens. By adjusting the sag ratio, the desired optical performance can be achieved while maintaining lens compactness.

[0146] Furthermore, in the lens design, the sag and shape of each lens need to be coordinated. The sag ratio design of the fifth lens 5 is also part of this coordination process, helping to ensure that the entire lens achieves high imaging quality while maintaining a wide field of view and low distortion.

[0147] For example, S2 / S1 is 5.6, 5.9, or 6.2.

[0148] In some examples of this application, see Figure 1 In the third lens group, the eleventh lens 11, the twelfth lens 12, the thirteenth lens 13, and the fourteenth lens 14 are arranged adjacent to each other in sequence. The ratio of the center thickness T15 of the fifteenth lens 15 to the total optical length TTL of the external aperture lens module satisfies the following: 7.5% < T15 / TTL < 9.5%.

[0149] In the example provided in this application, regarding the design of the third lens group (i.e., the rear lens group of the lens, which is close to the receiving chip 17), it is specifically pointed out that the eleventh lens 11, the twelfth lens 12, the thirteenth lens 13, and the fourteenth lens 14 are arranged in sequence and closely together. The ratio of the center thickness T15 of the fifteenth lens 15 to the total optical length TTL is clearly specified, namely, 7.5% < T15 / TTL < 9.5%. The following is a detailed analysis of this example.

[0150] The close proximity of the eleventh to fourteenth lenses 11, 14 helps reduce light scattering and loss as it passes through these lenses, improving light utilization and image quality. This closely spaced arrangement also helps reduce the overall volume of the entire lens (or the aperture-external lens module), making it more compact. The close proximity arrangement here refers to forming a close-contact lens with the eleventh, 11th, 12th, 13th, and fourteenth lenses, 14. Only the twelfth, 12th, and thirteenth lenses 13 need to be glued together, while the remaining lenses only need to be placed close together.

[0151] The fifteenth lens 15 is the last lens of the third lens group. Controlling the ratio of its center thickness T15 to the total optical length TTL has an important impact on the optical performance and structural stability of the entire lens.

[0152] In this example of the present application, by setting the ratio range of 7.5% < T15 / TTL < 9.5%, it is possible to ensure that the fifteenth lens 15 plays an appropriate optical role in the lens. This ratio is neither too thick to cause excessive refraction of light or unnecessary aberrations, nor too thin to effectively participate in light convergence and aberration correction. In addition, a reasonable thickness ratio helps to enhance the mechanical and thermal stability of the lens. In environments such as temperature changes or mechanical vibrations, the lens can maintain good imaging performance and reduce the degradation of image quality caused by environmental factors.

[0153] In summary, the design of the center thickness of the fifteenth lens element 15 helps optimize light convergence, enabling it to more accurately converge on the imaging plane and reducing aberrations caused by light deviating from the ideal convergence point. By controlling the center thickness of the fifteenth lens element 15, it can work in tandem with other lenses to more effectively correct high-order aberrations such as field curvature and astigmatism, improving image clarity and accuracy. A reasonable thickness ratio design helps enhance the mechanical strength of the lens, ensuring it maintains good shape and position stability even when subjected to external forces.

[0154] For example, T15 / TTL is 7.8%, 8.5% or 9.2%.

[0155] In some examples of the present application, the center thickness T1 of the first lens 1, the center thickness T2 of the second lens 2, the center thickness T5 of the fifth lens 5, and the center thickness T6 of the sixth lens 6 satisfy the following: 5<(T5+T6) / (T1+T2)<7.

[0156] In the example provided in this application, for the design of the lenses in the external aperture lens module, the relationship between the center thicknesses T1, T2, T5, and T6 of the first lens 1, the second lens 2, the fifth lens 5, and the sixth lens 6 is specially designed, that is, 5<(T5+T6) / (T1+T2)<7 is satisfied. The following is a detailed analysis of this example.

[0157] The center thickness of a lens has a direct impact on its optical performance. Thicker lenses generally have greater light-gathering power, but may also increase aberrations. Conversely, thinner lenses may reduce aberrations but may have less light-gathering power.

[0158] In this example of the present application, by controlling the thickness relationship between the first two lenses in the first lens group and the first two lenses in the second lens group, the light focusing ability and aberration correction can be balanced to achieve optimal optical performance.

[0159] Specifically, the first and second lenses 1 and 2, as the front group of the lens, are primarily responsible for initial light convergence and aberration correction. The fifth and sixth lenses 5 and 6, as the middle group of the lens, further contribute to light convergence and correction of higher-order aberrations. By setting the ratio range of (T5+T6) / (T1+T2), the light propagation path throughout the lens can be optimized, ensuring that light is accurately converged on the imaging plane.

[0160] Lenses of different thicknesses have different aberration correction capabilities. In this example of the present application, by reasonably matching the thickness of the lenses, the lenses can play a synergistic role in aberration correction and jointly improve the imaging quality. By controlling the thickness ratio of the above-mentioned lenses, the structure of the lens can be made more compact while ensuring optical performance. This helps to reduce the volume and weight of the aperture external lens module and improve its portability and applicability. A reasonable lens thickness ratio helps to enhance the mechanical stability of the lens. When subjected to external force or temperature changes, the lens can maintain good shape and position stability, thereby ensuring the stability of the imaging quality.

[0161] In some examples of the present application, the center thickness T7 of the seventh lens 7, the center thickness T8 of the eighth lens 8, the center thickness T9 of the ninth lens 9, and the center thickness T10 of the tenth lens 10 satisfy the following relationship: 2<(T7+T9) / (T8+T10)<3.5.

[0162] In the example provided herein, the design of the second lens group (center group) of the lens specifically specifies the relationship between the center thicknesses T7, T8, T9, and T10 of the seventh lens element 7, the eighth lens element 8, the ninth lens element 9, and the tenth lens element 10, such that 2<(T7+T9) / (T8+T10)<3.5. The following is a detailed analysis of this example.

[0163] See also Figure 1 The seventh lens element 7, the eighth lens element 8, the ninth lens element 9, and the tenth lens element 10 form the center lens group of the external aperture lens module, and collectively participate in light convergence and aberration correction. By setting the ratio range of (T7+T9) / (T8+T10), the light propagation path between these lenses can be optimized, ensuring that light is more accurately converged on the imaging plane.

[0164] In this example of the present application, by optimizing the thickness ratio of the four rear lenses in the second lens group, various aberrations can be more effectively corrected, improving image clarity and accuracy. Light can be more accurately focused on the imaging plane, reducing image blur or distortion caused by aberrations.

[0165] In addition, a reasonable lens thickness ratio also helps enhance the mechanical and thermal stability of the lens. When subjected to external forces or temperature changes, the lens can maintain good imaging performance and reduce the degradation of imaging quality caused by environmental factors.

[0166] In some examples of the present application, the center thickness T11 of the eleventh lens 11, the center thickness T12 of the twelfth lens 12, the center thickness T13 of the thirteenth lens 13, the center thickness T14 of the fourteenth lens 14, and the center thickness T15 of the fifteenth lens 15 satisfy the following relationship: 3.5<(T11+T13+T14) / (T12+T15)<5.5.

[0167] In the example provided herein, for the third lens group (rear lens group) of the lens, the relationship between the center thicknesses T11, T12, T13, T14, and T15 of the eleventh lens element 11, the twelfth lens element 12, the thirteenth lens element 13, the fourteenth lens element 14, and the fifteenth lens element 15 is specifically specified to satisfy the following: 3.5 < (T11 + T13 + T14) / (T12 + T15) < 5.5. This design aims to optimize the optical performance of the rear lens module, particularly in terms of aberration correction, light convergence, and overall structural stability. The following is a detailed analysis of this example.

[0168] The eleventh through fifteenth lenses, forming the rear element of the lens, collectively contribute to the final convergence of light and aberration correction. By adjusting the ratio (T11+T13+T14) / (T12+T15) (the sum of the three thicker lenses to the sum of the two thinner lenses), the synergistic effect of these lenses in light convergence and aberration correction can be optimized, ensuring more accurate light convergence on the imaging plane while effectively correcting various aberrations.

[0169] Of course, the reasonable lens thickness ratio in this example of the present application also helps to enhance the mechanical stability of the lens. When subjected to external forces or temperature changes, the lens can maintain good shape and position stability, thereby ensuring the stability of imaging quality.

[0170] In addition, by controlling the thickness ratio of the five lenses in the third lens group, the structure of the lens can be made more compact while ensuring the optical performance, which helps to reduce the size and weight of the lens.

[0171] In some examples of the present application, referring to Figure 2 , the included angle between the tangent line of the lens surface of the first lens 1 away from the diaphragm 16 and the optical axis at the maximum aperture is A1, and the included angle between the tangent line of the lens surface of the first lens 1 close to the diaphragm 16 and the optical axis at the maximum aperture is A2. The following relationship is satisfied between A1 and A2: 50° < (A1 + A2) / 2 < 70° and 1 < A2 / A1 < 1.3.

[0172] In the examples provided by the present application, the first lens 1 is designed, and the relationship between the included angle A1 between the tangent line of the lens surface away from the diaphragm 16 and the optical axis at the maximum aperture and the included angle A2 between the tangent line of the lens surface close to the diaphragm 16 and the optical axis at the maximum aperture is specifically specified, that is, 50° < (A1 + A2) / 2 < 70° and 1 < A2 / A1 < 1.3. This design has a significant impact on the optical performance of the lens. The following is a detailed analysis of this example.

[0173] It should be noted that the included angle between the tangent line of the lens and the optical axis directly determines the refraction path of light when passing through the lens. By setting the relationship between A1 and A2, the propagation direction of light in the first lens 1 can be controlled, thereby optimizing the light convergence effect.

[0174] Specifically, the range setting of (A1 + A2) / 2 ensures that the light can maintain a relatively stable refraction angle when passing through the first lens 1, which helps to reduce aberration and light scattering.

[0175] The ratio of A2 / A1 reflects the relative size of the included angles between the tangent lines of the two surfaces of the first lens 1 and the optical axis at the maximum aperture. This ratio greater than 1 means that the surface close to the diaphragm 16 is more inclined than the surface away from the diaphragm 16. This design helps the light to converge more effectively when passing through the lens. Among them, the upper limit of the ratio is 1.3, and this design avoids the increase of aberration and light loss caused by excessive inclination.

[0176] In the optical architecture provided by the present application, the first lens 1, as the front group part of the lens, its design directly affects the light reception and imaging quality of the subsequent lens groups. By optimizing the relationship between A1 and A2, a good optical foundation can be laid for the entire lens (or the lens module with an external diaphragm).

[0177] In addition, a reasonable angle design also helps to improve the overall compactness and mechanical stability of the lens, and reduces the structural deformation or performance degradation caused by improper lens inclination.

[0178] In some examples of the present application, referring to Figure 3, the included angle between the lens tangent line at the maximum aperture of the surface of the ninth lens 9 away from the diaphragm 16 and the optical axis is A3, and the included angle between the lens tangent line at the maximum aperture of the surface of the ninth lens 9 close to the diaphragm 16 and the optical axis is A4. The following relationship is satisfied between A3 and A4: 57° < (A3 + A4) / 2 < 67° and 0.85 < A3 / A4 < 1.15.

[0179] In the example provided by this application, for the design of the ninth lens 9, the relationship between the included angle A3 between the lens tangent line at the maximum aperture of the surface away from the diaphragm 16 and the optical axis, and the included angle A4 between the lens tangent line at the maximum aperture of the surface close to the diaphragm 16 and the optical axis is specifically specified, that is, 57° < (A3 + A4) / 2 < 67° and 0.85 < A3 / A4 < 1.15. The following is an analysis of this example.

[0180] The range of (A3 + A4) / 2 is set to 57° to 67°, which ensures that the light can maintain a relatively stable refraction angle range when passing through the ninth lens 9. This range helps to optimize the light propagation path and reduce the aberration caused by too large or too small refraction angles.

[0181] The setting of the average angle takes into account the uniform refraction of light in the lens and helps to maintain the clarity and accuracy of imaging.

[0182] The ratio of A3 / A4 reflects the relative magnitude of the included angles between the lens tangent lines at the maximum aperture of the two surfaces of the ninth lens 9 and the optical axis. This ratio being close to 1 (between 0.85 and 1.15) means that the inclination degrees of the two surfaces are relatively close. This design helps the light to maintain a relatively stable refraction behavior when passing through the lens.

[0183] The upper and lower limits of the ratio setting avoid too large differences in the inclination degrees of the two surfaces, thereby reducing the increase in aberration caused by the inclination difference.

[0184] As the middle group part of the lens, the design of the ninth lens 9 directly affects the further convergence of light and the imaging quality. By optimizing the relationship between A3 and A4, better light correction and convergence effects can be provided for the lens.

[0185] In addition, a reasonable angle design also helps to improve the overall compactness and mechanical stability of the lens because the inclination degree of the lens is closely related to the overall structure and stability of the lens.

[0186] By precisely controlling the angle relationship, the material cost and processing difficulty can be reduced while ensuring the imaging quality. A reasonable angle design helps to reduce unnecessary material waste and processing time, improve production efficiency and reduce costs.

[0187] In some examples of the present application, refer to Figure 4 : The included angle between the lens tangent line and the optical axis at the maximum aperture on the surface of the tenth lens 10 close to the diaphragm 16 is A5, and the included angle between the lens tangent line and the optical axis at the maximum aperture on the surface of the tenth lens 10 away from the diaphragm 16 is A6. The relationship between A5 and A6 satisfies: 1.65 < A6 / A5 < 2.05.

[0188] In the examples provided by the present application, for the design of the tenth lens 10, the relationship between the included angle A5 between the lens tangent line and the optical axis at the maximum aperture on the surface close to the diaphragm 16 and the included angle A6 between the lens tangent line and the optical axis at the maximum aperture on the surface away from the diaphragm 16 is specifically specified, that is, it satisfies 1.65 < A6 / A5 < 2.05. The following is a detailed analysis of this example.

[0189] Among them, the ratio of A6 / A5 reflects the relative magnitude relationship between the included angles of the tangent lines of the two surfaces of the tenth lens 10 with the optical axis at the maximum aperture. This ratio is greater than 1, which means that the surface of the tenth lens 10 away from the diaphragm 16 is more inclined than the surface close to the diaphragm 16.

[0190] The ratio range of A6 / A5 is set between 1.65 and 2.05, which ensures that this inclination degree is within a reasonable range, neither too gentle nor too steep, and helps to optimize the refraction and convergence effects of light.

[0191] As a part of the lens (especially the last lens of the second lens group), the design of the tenth lens 10 directly affects the light propagation path and imaging quality. By optimizing the relationship between A5 and A6, the refraction angle of light when passing through the tenth lens 10 can be controlled, thereby reducing aberration and improving imaging clarity.

[0192] The ratio range of A6 / A5 helps the light to converge more effectively towards the optical axis direction when passing through the tenth lens 10, which is particularly important for achieving the design goals of a large FOV (field of view) and low distortion.

[0193] The design of the tenth lens 10 needs to work in cooperation with other lens groups to achieve the optical performance of the entire lens. By optimizing the relationship between A5 and A6, it can be ensured that the tenth lens 10 plays the best role in the lens and improves the overall imaging quality.

[0194] In addition, a reasonable angle design also helps to improve the mechanical stability and thermal stability of the lens, and reduce structural deformation or performance degradation caused by improper lens inclination.

[0195] In some examples of the present application, refer to Figure 1The ratio of the total optical length TTL of the external aperture lens module to the maximum aperture D1 of the lens in the lens satisfies: 4.4<TTL / D1<5.6.

[0196] In the example provided in this application, the ratio of the total track length (TTL) of the external aperture lens to the maximum diameter (D1) of the lens within the lens is set to satisfy the range of 4.4 < TTL / D1 < 5.6. This optical parameter design has a significant impact on the optical performance and optical structure design of the external aperture lens module. The following is a detailed analysis of this example.

[0197] In the example provided in this application, the TTL / D1 ratio is a key optical parameter, which is directly related to the compactness, optical performance and manufacturing cost of the entire aperture external lens module.

[0198] The lower limit of the TTL / D1 ratio is 4.4, which ensures that the aperture external lens module has sufficient optical path length to achieve the required optical performance, such as focal length, aberration correction, etc.

[0199] The upper limit of the TTL / D1 ratio is 5.6, which limits the overall size of the external aperture lens, helps to maintain the compactness of the external aperture lens module, and facilitates integration into equipment such as AR product testing systems.

[0200] Within the ratio range provided in this example, the aperture-external lens module can be designed to be shorter while maintaining a larger aperture, which helps achieve optical performance with a large FOV (field of view) and low distortion. For example, the maximum effective aperture of the aperture-external lens in this application is 22mm.

[0201] In addition, a reasonable TTL / D1 ratio can also help optimize the light propagation path, reduce aberrations, and improve imaging clarity and accuracy.

[0202] See also Figure 1 In the aperture external lens module provided in the embodiment of the present application, the fifth lens 5 and the sixth lens 6 have the largest apertures.

[0203] In some examples of the present application, the effective focal length of each lens in the lens is:

[0204] The effective focal length of the first lens 1 is F1, -140mm≤F1≤-120mm;

[0205] The effective focal length of the second lens 2 is F2, 17mm≤F2≤20mm;

[0206] The effective focal length of the first doublet lens is F', 100 mm ≤ F' ≤ 110 mm;

[0207] The effective focal length of the fifth lens 5 is F5, 45mm≤F5≤60mm;

[0208] The effective focal length of the sixth lens 6 is F6, 22mm≤F6≤29mm;

[0209] The effective focal length of the seventh lens 7 is F7, -50mm≤F7≤-33mm;

[0210] The effective focal length of the eighth lens 8 is F8, -16mm≤F8≤-13mm;

[0211] The effective focal length of the ninth lens 9 is F9, -150mm≤F9≤-130mm;

[0212] The effective focal length of the tenth lens 10 is F10, 11mm≤F10≤14mm;

[0213] The effective focal length of the eleventh lens 11 is F11, -7mm≤F11≤-5mm;

[0214] The effective focal length of the second doublet lens is F'', 13mm≤F''≤15mm;

[0215] The effective focal length of the fourteenth lens 14 is F14, 22mm≤F14≤28mm;

[0216] The effective focal length of the fifteenth lens 15 is F15, 17mm≤F15≤23mm;

[0217] The first lens 1 to the fifteenth lens 15 are all spherical lenses.

[0218] The examples provided in this application detail the effective focal length ranges of each lens in the lens. The selection of these focal length ranges is crucial to achieving the overall optical performance of the lens. The following is an analysis of the effective focal length settings of each lens and their technical effects.

[0219] The first lens (F1) has a focal length range of -140mm to -120mm. Its negative focal length indicates that it is a concave lens, which helps to diverge light and provide a suitable angle of incidence for subsequent lenses. By diverging light, it helps expand the field of view (FOV) and reduce spherical aberration.

[0220] The second lens element (F2) has a focal length range of 17mm to 20mm. Its positive focal length indicates that it is a convex lens that converges light. Working in conjunction with the first lens element (1), it adjusts the light propagation path, reduces aberrations, and improves image clarity.

[0221] The first doublet lens (F') has a focal length range of 100mm to 110mm. The doublet lens is made by gluing two lenses of different refractive indices together, effectively correcting chromatic aberration. By gluing lenses of different materials together, chromatic aberration is reduced and image color reproduction is improved.

[0222] The fifth lens element (F5) has a focal length range of 45mm to 60mm. It is a positive focal length convex lens that further converges light. The design of the fifth lens element (F5) enhances light convergence, helping to achieve a shorter total optical length (TTL) while maintaining a larger imaging surface.

[0223] The sixth lens element (F6) has a focal length range of 22mm to 29mm and is a positive focal length convex lens that continues to converge light. It works together with the fifth lens element (5) to optimize the light propagation path and reduce aberrations.

[0224] The seventh lens element 7 (F7) and the eighth lens element 8 (F8) have focal lengths ranging from -50mm to -33mm and -16mm to -13mm, respectively. Both are negative focal length concave lenses that diverge light. This divergence adjusts the direction of light propagation, reduces aberrations, and improves image quality.

[0225] The ninth lens element (F9): With a focal length range of -150mm to -130mm, this negative focal length concave lens has a large divergence capability. It plays a crucial role in light adjustment within the lens, contributing to a large field of view and low distortion.

[0226] The tenth lens element (F10) has a focal length range of 11mm to 14mm. It is a positive focal length convex lens that converges light. Working in conjunction with the preceding lens element, it achieves precise light convergence and improves image clarity.

[0227] The eleventh lens element (F11) has a focal length range of -7mm to -5mm. It is a negative focal length concave lens that fine-tunes light, helping to reduce aberrations and improve edge clarity.

[0228] The second doublet lens (F'') has a focal length range of 13mm to 15mm. This doublet lens further corrects chromatic aberration. By bonding lenses of different materials, chromatic aberration is effectively reduced and image color reproduction is improved.

[0229] The fourteenth lens element 14 (F14) and the fifteenth lens element 15 (F15) have focal lengths ranging from 22mm to 28mm and 17mm to 23mm, respectively. Both are positive focal length convex lenses that ultimately converge light. Together, they precisely converge light onto the imaging surface, ensuring image clarity and accuracy.

[0230] In summary, by rationally designing the focal lengths and lens combinations, a wide field of view (FOV) and low distortion are achieved, meeting the requirements of applications such as AR product testing systems. The effective focal length settings and lens combinations help optimize light propagation paths, reduce aberrations, and improve image clarity and accuracy. Combined with the use of a doublet lens, chromatic aberration is effectively corrected, enhancing color reproduction. Furthermore, the focal length settings and lens combinations result in a compact overall structure, facilitating integration into equipment such as AR product testing systems.

[0231] In addition, in the aperture external lens module provided in the embodiment of the present application, all lenses are glass spherical lenses, which can reduce production costs.

[0232] The aperture external lens module of the present application is further described below through Examples 1 to 4.

[0233] Example 1

[0234] See also Figure 5 The diaphragm external lens module provided in Example 1 is provided with an diaphragm 16, a lens and a receiving chip 17 in sequence;

[0235] The lens comprises a first lens group, a second lens group and a third lens group in sequence along the optical axis direction;

[0236] The first lens group is located on a side close to the aperture 16, and includes a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4. The third lens 3 and the fourth lens 4 are cemented together to form a first doublet lens. The optical power of the first lens group is positive.

[0237] The second lens group includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10;

[0238] The third lens group is located on one side of the receiving chip 17, and includes an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, and a fifteenth lens 15. The twelfth lens 12 and the thirteenth lens 13 are cemented together to form a second doublet lens.

[0239] In the first lens group: the first lens 1 has negative optical power, and the second lens 2 and the first doublet lens both have positive optical power;

[0240] In the second lens group: the fifth lens 5, the sixth lens 6 and the tenth lens 10 all have positive refractive power, and the seventh lens 7, the eighth lens 8 and the ninth lens 9 all have negative refractive power;

[0241] In the third lens group, the eleventh lens 11 has a negative optical power, and the second doublet lens, the fourteenth lens 14 and the fifteenth lens 15 all have a positive optical power.

[0242] See Table 1, which shows Figure 5 Provides the optical parameters of the aperture external lens module.

[0243] Table 1

[0244]

[0245] Example 2

[0246] See also Figure 6 The diaphragm external lens module provided in Example 2 is provided with an diaphragm 16, a lens and a receiving chip 17 in sequence;

[0247] The lens comprises a first lens group, a second lens group and a third lens group in sequence along the optical axis direction;

[0248] The first lens group is located on a side close to the aperture 16, and includes a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4. The third lens 3 and the fourth lens 4 are cemented together to form a first doublet lens. The optical power of the first lens group is positive.

[0249] The second lens group includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10;

[0250] The third lens group is located on one side of the receiving chip 17, and includes an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, and a fifteenth lens 15. The twelfth lens 12 and the thirteenth lens 13 are cemented together to form a second doublet lens.

[0251] In the first lens group: the first lens 1 has negative optical power, and the second lens 2 and the first doublet lens both have positive optical power;

[0252] In the second lens group: the fifth lens 5, the sixth lens 6 and the tenth lens 10 all have positive refractive power, and the seventh lens 7, the eighth lens 8 and the ninth lens 9 all have negative refractive power;

[0253] In the third lens group, the eleventh lens 11 has a negative optical power, and the second doublet lens, the fourteenth lens 14 and the fifteenth lens 15 all have a positive optical power.

[0254] See Table 2, which shows Figure 6 Provides the optical parameters of the aperture external lens module.

[0255] Table 2

[0256]

[0257] Example 3

[0258] See also Figure 7 The diaphragm external lens module provided in Example 3 is provided with an diaphragm 16, a lens and a receiving chip 17 in sequence;

[0259] The lens comprises a first lens group, a second lens group and a third lens group in sequence along the optical axis direction;

[0260] The first lens group is located on a side close to the aperture 16, and includes a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4. The third lens 3 and the fourth lens 4 are cemented together to form a first doublet lens. The optical power of the first lens group is positive.

[0261] The second lens group includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10;

[0262] The third lens group is located on one side of the receiving chip 17, and includes an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, and a fifteenth lens 15. The twelfth lens 12 and the thirteenth lens 13 are cemented together to form a second doublet lens.

[0263] In the first lens group: the first lens 1 has negative optical power, and the second lens 2 and the first doublet lens both have positive optical power;

[0264] In the second lens group: the fifth lens 5, the sixth lens 6 and the tenth lens 10 all have positive refractive power, and the seventh lens 7, the eighth lens 8 and the ninth lens 9 all have negative refractive power;

[0265] In the third lens group, the eleventh lens 11 has a negative optical power, and the second doublet lens, the fourteenth lens 14 and the fifteenth lens 15 all have a positive optical power.

[0266] See Table 3, which shows Figure 7 Provides the optical parameters of the aperture external lens module.

[0267] Table 3

[0268]

[0269] Example 4

[0270] See also Figure 8 The diaphragm external lens module provided in Example 4 is provided with an diaphragm 16, a lens and a receiving chip 17 in sequence;

[0271] The lens comprises a first lens group, a second lens group and a third lens group in sequence along the optical axis direction;

[0272] The first lens group is located on a side close to the aperture 16, and includes a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4. The third lens 3 and the fourth lens 4 are cemented together to form a first doublet lens. The optical power of the first lens group is positive.

[0273] The second lens group includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10;

[0274] The third lens group is located on one side of the receiving chip 17, and includes an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, and a fifteenth lens 15. The twelfth lens 12 and the thirteenth lens 13 are cemented together to form a second doublet lens.

[0275] In the first lens group: the first lens 1 has negative optical power, and the second lens 2 and the first doublet lens both have positive optical power;

[0276] In the second lens group: the fifth lens 5, the sixth lens 6 and the tenth lens 10 all have positive refractive power, and the seventh lens 7, the eighth lens 8 and the ninth lens 9 all have negative refractive power;

[0277] In the third lens group, the eleventh lens 11 has a negative optical power, and the second doublet lens, the fourteenth lens 14 and the fifteenth lens 15 all have a positive optical power.

[0278] See Table 4, which shows Figure 8 Provides the optical parameters of the aperture external lens module.

[0279] Table 4

[0280]

[0281] The optical architecture of the external aperture lens modules provided in Examples 1 to 4 is the same (all based on fifteen glass spherical lenses), with the difference being that the optical parameters of each lens are slightly different. The optical performance of the external aperture lens module provided in the present embodiment is as follows:

[0282] See also Figure 9 , Figure 9 This is the distortion diagram of the lens module with an external aperture. The absolute value of the distortion is less than 0.2%. Figure 10 , Figure 10 This is the MTF diagram of the lens module with an external aperture. The MTF is >0.4 at 125lp / mm.

[0283] According to another embodiment of the present application, a testing device is provided, and the tested device includes a housing and the aperture external lens module as described above.

[0284] The specific implementation of the testing equipment of the embodiment of the present application can refer to the various embodiments of the above-mentioned aperture external lens module, so it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0285] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0286] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above examples may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A lens module with an external aperture, characterized in that: It includes an aperture (16), a lens, and a receiving chip (17) arranged in sequence; The lens comprises a first lens group, a second lens group and a third lens group in sequence along the optical axis direction; The first lens group is located on a side close to the aperture (16), and comprises a first lens (1), a second lens (2), a third lens (3) and a fourth lens (4); the third lens (3) and the fourth lens (4) are glued together to form a first doublet lens; the optical power of the first lens group is positive; The second lens group comprises a fifth lens (5), a sixth lens (6), a seventh lens (7), an eighth lens (8), a ninth lens (9) and a tenth lens (10); The third lens group is located on one side of the receiving chip (17), and includes an eleventh lens (11), a twelfth lens (12), a thirteenth lens (13), a fourteenth lens (14) and a fifteenth lens (15), wherein the twelfth lens (12) and the thirteenth lens (13) are glued together to form a second doublet lens; The air gap between the first lens group and the second lens group is L1, and the air gap between the second lens group and the third lens group is L2. <L1 / L2<2.7; In the first lens group: the first lens (1) has a negative optical power, and the second lens (2) and the first doublet lens both have a positive optical power; In the second lens group: the fifth lens (5), the sixth lens (6) and the tenth lens (10) all have positive focal powers, and the seventh lens (7), the eighth lens (8) and the ninth lens (9) all have negative focal powers; In the third lens group: the eleventh lens (11) has a negative optical focal length, and the second doublet lens, the fourteenth lens (14) and the fifteenth lens (15) all have a positive optical focal length.

2. The aperture external lens module according to claim 1, characterized in that: In the first doublet lens: the third lens (3) has a positive focal power, and the fourth lens (4) has a negative focal power; In the second doublet lens, the twelfth lens (12) has a negative optical focal length, and the thirteenth lens (13) has a positive optical focal length.

3. The external aperture lens module according to claim 1, wherein: The ratio of the center thickness T' of the first doublet lens to the total optical length TTL of the aperture external lens module satisfies: 6.8%<T' / TTL<8.2%.

4. The external aperture lens module according to claim 1, wherein: The ratio of the center thickness T5 of the fifth lens (5) to the total optical length TTL of the aperture external lens module satisfies the following: 10%<T5 / TTL<12.5%.

5. The aperture external lens module according to claim 4, characterized in that: The sag height of the surface of the fifth lens (5) close to the aperture (16) at the maximum aperture is S1, and the sag height of the surface of the fifth lens (5) away from the aperture (16) at the maximum aperture is S2, and the ratio of S2 to S1 satisfies: 5.5 <S2 / S1<6.4。 6. The external aperture lens module according to claim 1, characterized in that: In the third lens group: the eleventh lens (11), the twelfth lens (12), the thirteenth lens (13) and the fourteenth lens (14) are arranged adjacent to each other in sequence; The ratio of the center thickness T15 of the fifteenth lens (15) to the total optical length TTL of the aperture external lens module satisfies the following conditions: 7.5%<T15 / TTL<9.5%.

7. The external aperture lens module according to claim 1, wherein: The center thickness T1 of the first lens (1), the center thickness T2 of the second lens (2), the center thickness T5 of the fifth lens (5), and the center thickness T6 of the sixth lens (6) satisfy the following relationship: 5<(T5+T6) / (T1+T2)<7.

8. The external aperture lens module according to claim 7, wherein: The center thickness T7 of the seventh lens (7), the center thickness T8 of the eighth lens (8), the center thickness T9 of the ninth lens (9), and the center thickness T10 of the tenth lens (10) satisfy the following relationship: 2<(T7+T9) / (T8+T10)<3.

5.

9. The external aperture lens module according to claim 8, characterized in that: The center thickness T11 of the eleventh lens (11), the center thickness T12 of the twelfth lens (12), the center thickness T13 of the thirteenth lens (13), the center thickness T14 of the fourteenth lens (14), and the center thickness T15 of the fifteenth lens (15) satisfy the following relationship: 3.5<(T11+T13+T14) / (T12+T15)<5.

5.

10. The external aperture lens module according to claim 1, wherein: The angle between the lens tangent of the surface of the first lens (1) away from the aperture (16) at the maximum aperture and the optical axis is A1, and the angle between the lens tangent of the surface of the first lens (1) close to the aperture (16) at the maximum aperture and the optical axis is A2, and the following relationship is satisfied between A1 and A2: 50°<(A1+A2) / 2<70° and 1 <A2 / A1<1.3。 11. The external aperture lens module according to claim 1, wherein: The angle between the lens tangent of the surface of the ninth lens (9) away from the aperture (16) at the maximum aperture and the optical axis is A3, and the angle between the lens tangent of the surface of the ninth lens (9) close to the aperture (16) at the maximum aperture and the optical axis is A4, and the following relationship is satisfied between A3 and A4: 57°<(A3+A4) / 2<67° and 0.85 <A3 / A4<1.15。 12. The external aperture lens module according to claim 11, wherein: The angle between the lens tangent of the surface of the tenth lens (10) close to the aperture (16) at the maximum aperture and the optical axis is A5, and the angle between the lens tangent of the surface of the tenth lens (10) away from the aperture (16) at the maximum aperture and the optical axis is A6, and the angle between A5 and A6 satisfies: 1.65 <A6 / A5<2.05。 13. The external aperture lens module according to claim 1, wherein: The ratio of the total optical length TTL of the external aperture lens module to the maximum aperture D1 of the lens in the lens satisfies: 4.4<TTL / D1<5.

6.

14. The external aperture lens module according to claim 1, wherein: The effective focal length of each lens in the lens is: The effective focal length of the first lens (1) is F1, -140mm≤F1≤-120mm; The effective focal length of the second lens (2) is F2, 17mm≤F2≤20mm; The effective focal length of the first doublet lens is F', 100 mm ≤ F' ≤ 110 mm; The effective focal length of the fifth lens (5) is F5, 45mm≤F5≤60mm; The effective focal length of the sixth lens (6) is F6, 22mm≤F6≤29mm; The effective focal length of the seventh lens (7) is F7, -50mm≤F7≤-33mm; The effective focal length of the eighth lens (8) is F8, -16mm≤F8≤-13mm; The effective focal length of the ninth lens (9) is F9, -150mm≤F9≤-130mm; The effective focal length of the tenth lens (10) is F10, 11mm≤F10≤14mm; The effective focal length of the eleventh lens (11) is F11, -7mm≤F11≤-5mm; The effective focal length of the second doublet lens is F'', 13mm≤F''≤15mm; The effective focal length of the fourteenth lens (14) is F14, 22mm≤F14≤28mm; The effective focal length of the fifteenth lens (15) is F15, 17mm≤F15≤23mm; The first lens (1) to the fifteenth lens (15) are all spherical lenses.

15. A testing device, characterized in that: include: The external aperture lens module according to any one of claims 1 to 14.

Images