Optical lens

Abstract

The embodiment of the invention provides an optical lens. The optical lens comprises a first lens group, a diaphragm and a second lens group which are sequentially arranged along the same optical axis. The first lens group comprises a first lens and a second lens which are arranged along the optical axis, and the second lens is positioned on one side close to the diaphragm; the second lens group comprises a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged along the optical axis, the third lens is located on the side close to the diaphragm, and the sixth lens is located on the side away from the diaphragm; the first lens comprises a first surface far away from the diaphragm and a second surface close to the diaphragm, the curvature radius of the first surface is the same as that of the front surface of the cornea of the human eye, and the curvature radius of the second surface is the same as that of the rear surface of the cornea of the human eye.

Description

An optical lens Technical Field

[0001] This application relates to the field of optical testing technology, and more specifically, to an optical lens. Background Technology

[0002] With the rapid development of technologies such as virtual reality (VR) and augmented reality (AR), eye tracking has become one of the important functions of these near-eye optical devices. However, most existing near-eye display optical testing equipment can only simulate the human pupil, but cannot fully simulate the shape and optical characteristics of the human eye, resulting in limitations when testing eye-tracking functions. Therefore, developing a lens design that can highly simulate the optical characteristics of the human eye is particularly important. Summary of the Invention

[0003] The purpose of this application is to provide a new technical solution for optical lenses.

[0004] This application provides an optical lens. The optical lens includes a first lens group, an aperture stop, and a second lens group arranged sequentially along the same optical axis.

[0005] The first lens group includes a first lens and a second lens arranged along the optical axis, wherein the second lens is located on the side closer to the aperture stop;

[0006] The second lens group includes a third lens, a fourth lens, a fifth lens, and a sixth lens arranged along the optical axis, wherein the third lens is located on the side closer to the aperture stop, and the sixth lens is located on the side farther from the aperture stop;

[0007] The first lens includes a first surface away from the aperture and a second surface close to the aperture. The radius of curvature of the first surface is the same as the radius of curvature of the anterior surface of the cornea of ​​the human eye, and the radius of curvature of the second surface is the same as the radius of curvature of the posterior surface of the cornea of ​​the human eye.

[0008] Optionally, if the distance from the first surface to the entrance pupil position of the optical lens is H, and the distance from the cornea of ​​the human eye to the pupil is D, then H satisfies: H = D.

[0009] Optionally, the size of the aperture is matched to the size of the human eye's pupil.

[0010] Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all spherical lenses.

[0011] Optionally, the third lens and the fourth lens are cemented together to form a cemented lens.

[0012] Optionally, the sixth lens is configured to move along the optical axis to approach or move away from the fifth lens.

[0013] Optionally, the optical lens further includes an eye-tracking component disposed on one side of the first surface;

[0014] Furthermore, an infrared reflective film is provided on the first surface of the first lens.

[0015] Optionally, the eye-tracking component includes an infrared camera and an infrared light source;

[0016] The infrared light emitted by the infrared light source is projected onto the first surface. After being reflected by the infrared reflective film, the infrared camera is used to capture the infrared light reflected by the infrared reflective film.

[0017] Optionally, the optical lens further includes a processor for calculating the gaze point information of the optical lens based on the infrared light captured by the infrared camera, the gaze point information including the angle and position of the gaze point.

[0018] Optionally, the optical lens further includes a photosensitive element located on the side of the second lens group opposite to the aperture stop.

[0019] The beneficial effects of this application are as follows:

[0020] This application provides an optical lens, which relates to a human eye-inspired optical lens design. By mimicking the corneal shape of the human eye and combining it with a specific optical architecture, it achieves a high degree of simulation of the optical characteristics of the human eye, helping to improve the accuracy and reliability of optical tracking. This design is not only widely used in the testing of the optical performance and eye-tracking function of XR devices, effectively improving testing accuracy, but also meets the needs of XR technology development, providing support for the research, testing, and evaluation of XR devices, and promoting the overall progress and development of the XR technology field.

[0021] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0023] Figure 1 is one of the optical structures and optical path diagrams of the optical lens provided in the embodiments of this application;

[0024] Figure 2 is a schematic diagram of the structure of the human eye;

[0025] Figure 3 shows one of the MTF curves of the optical lens provided in the embodiments of this application;

[0026] Figure 4 is one of the field curvature and distortion diagrams of the optical lens provided in the embodiments of this application;

[0027] Figure 5 is a second schematic diagram of the optical structure and optical path of the optical lens provided in the embodiment of this application;

[0028] Figure 6 shows a second MTF curve of the optical lens provided in the embodiment of this application;

[0029] Figure 7 is a second field curvature and distortion diagram of the optical lens provided in the embodiment of this application;

[0030] Figure 8 is a schematic diagram of the optical structure and optical path of the optical lens provided in the embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Aperture stop; 8. Photosensitive element; 9. Infrared camera; 10. Infrared light source; 01. Cornea; 02. Pupil;

[0033] S1, First surface; S2, Second surface; S3, Third surface; S4, Fourth surface; S5, Fifth surface; S6, Sixth surface; S7, Seventh surface; S8, Eighth surface; S9, Ninth surface;

[0034] S10, the tenth surface; S11, the eleventh surface; S12, the twelfth surface; S13, the thirteenth surface. Detailed Implementation

[0035] 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 arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0036] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0037] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0038] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0040] The optical lens provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0041] According to one embodiment of this application, an optical lens is provided. Referring to Figures 1 and 2, the optical lens includes a first lens group, an aperture 7, and a second lens group arranged sequentially along the same optical axis. The first lens group includes a first lens 1 and a second lens 2 arranged along the optical axis, with the second lens 2 located on the side closer to the aperture 7. The second lens group includes a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged along the optical axis, wherein the third lens 3 is located on the side closer to the aperture 7, and the sixth lens 6 is located on the side farther from the aperture 7. The first lens 1 includes a first surface S1 farther from the aperture 7 and a second surface S2 closer to the aperture 7. The radius of curvature of the first surface S1 is the same as the radius of curvature of the anterior surface of the cornea O1 of the human eye, and the radius of curvature of the second surface S2 is the same as the radius of curvature of the posterior surface of the cornea O1 of the human eye.

[0042] This application describes an optical lens of a specific design, whose optical structure and optical parameter settings are intended to achieve specific optical performance, particularly in simulating or matching the optical characteristics of the human eye. The following is a detailed analysis of the optical lens of this application embodiment and a description of its technical effects.

[0043] The optical lens provided in this application embodiment, as shown in Figure 1, is mainly composed of two lens groups—a first lens group and a second lens group—which are arranged in series along the same optical axis and separated by an aperture stop 7.

[0044] Referring to Figure 1, the first lens group includes a first lens 1 and a second lens 2 arranged adjacent to each other and spaced apart along the same optical axis, wherein the second lens 2 is located on the side closer to the aperture stop 7. It is worth noting that in the first lens group, the surface design of the first lens 1 is particularly special, and the radii of curvature of its two surfaces, namely the first surface S1 and the second surface S2, match the radii of curvature of the anterior and posterior surfaces of the cornea O1 of the human eye, respectively (see Figure 2 for the human eye).

[0045] Please refer to Figure 1. The second lens group mainly consists of lenses 3 to 6, starting with lens 3 near the aperture stop 7 and ending with lens 6 away from the aperture stop 7. This combination can be used for further aberration correction, focal length adjustment, and field of view expansion.

[0046] The optical lens provided in this application embodiment can simulate the optical characteristics of the human eye. Specifically, referring to Figure 1, the surface design of the first lens 1 directly simulates the shape of the cornea O1 of the human eye, which further enhances the simulation degree of the overall morphology of the human cornea by the entire optical lens. This highly realistic design enables the optical lens provided in this application embodiment to more realistically simulate the optical characteristics of the human eye in tests such as XR devices, especially in eye-tracking function tests, and can more accurately reflect the optical response of the human eye when actually using XR devices. By simulating the shape of the human cornea, the optical lens can more accurately capture and reflect infrared light, which can then be captured by an infrared camera, thereby achieving precise tracking of eye movements and gaze points.

[0047] The optical system of the human eye is extremely complex and precise. The cornea O1, as the outermost transparent tissue of the eye, plays a crucial role in the initial focusing and refraction of light. As shown in Figure 2, the anterior and posterior surfaces of the cornea O1 have different radii of curvature. This design allows the human eye to efficiently focus light onto the retina to form a clear image.

[0048] In the optical lens provided in this application embodiment, the radii of curvature of the two surfaces (first surface S1 and second surface S2) of the first lens 1 are designed to be the radii of curvature of the anterior and posterior surfaces of the cornea O1 of the human eye, respectively. This aims to simulate the real state of the human eye as much as possible during the light reception and initial focusing process. This design is of great significance for improving the accuracy of optical performance testing of XR devices (including VR and AR devices), especially for testing eye-tracking functions.

[0049] The radius of curvature of the cornea 01 directly affects the refraction and focusing of light. By designing the radius of curvature of the first surface S1 of the first lens 1 to match that of the cornea 01 of the human eye, the optical lens can produce a refraction effect similar to that of the human eye when receiving light, thereby reducing aberrations caused by improper optical lens design. This helps to improve image clarity.

[0050] When using XR devices, users may need to wear them for extended periods. If the optical design of the lens is not ergonomic, it can easily cause user discomfort such as dizziness and visual fatigue. By designing the radius of curvature of the first lens 1 to match that of the human cornea 01, the light entering the user's eyes can be more natural and softer, thereby reducing user discomfort and improving user comfort.

[0051] Because the design of this application can highly simulate the optical characteristics of the human eye, it can more accurately test the eye-tracking function of XR devices. Eye-tracking technology requires accurately capturing the user's gaze direction and fixation point position, and the optical design of the lens in this application makes the testing process closer to the usage state in a real-world scenario, thereby improving the accuracy and reliability of the test.

[0052] The optical lens provided in this application, through a carefully designed lens combination and the position of the aperture stop 7, can effectively reduce or correct various aberrations, such as spherical aberration, chromatic aberration, and distortion, thereby improving image quality. In particular, the special design of the first lens 1 facilitates preliminary optical processing similar to that of the human eye when light enters the optical lens, laying the foundation for subsequent lens correction.

[0053] In applications such as XR devices, optical lenses that interact directly with the user's eyes can greatly enhance user comfort and immersion if their design more closely resembles the characteristics of the human eye. The first lens 1 in this application is designed based on this consideration, aiming to provide a more natural and comfortable visual experience.

[0054] The optical lens design of this application embodiment not only features a meticulous structural layout, but more importantly, by simulating the characteristics of the human cornea, it achieves a high degree of simulation of light processing in specific application scenarios, thereby improving image quality and user experience.

[0055] In some examples of this application, referring to Figures 1 and 2, the distance from the first surface S1 to the entrance pupil position of the optical lens is H, and the distance from the cornea O1 to the pupil O2 of the human eye is D. Then H must satisfy: H = D.

[0056] By setting the distance H from the first surface S1 of the optical lens to the entrance pupil position of the optical lens to be equal to the distance D from the cornea O1 to the pupil O2 of the human eye, this application ensures that the optical lens is structurally highly simulated of the human eye. This distance control enables the optical lens to more realistically reflect the actual working state of the human eye when simulating optical testing and eye tracking, thereby improving the accuracy and reliability of the test.

[0057] In XR devices, the eye-tracking function relies on the reflection of infrared light on the cornea of ​​the human eye. By precisely matching the radius of curvature and position of the first surface S1 of the optical lens with the anterior surface O1 of the cornea of ​​the human eye, the optical design provided in this application embodiment makes the reflection behavior of infrared light emitted by an infrared light source on the first surface S1 more closely resemble that of a real human eye, thereby improving the accuracy and precision of the eye-tracking algorithm.

[0058] Traditional near-eye display optical testing equipment can only simulate the human pupil and cannot fully simulate the shape and optical characteristics of the human eye. However, the technical solution of this application, by fully simulating the human cornea, pupil and their relative positions, is not only suitable for testing the optical performance indicators of XR devices, but is also particularly suitable for testing eye-tracking functions, greatly expanding the application range of the testing equipment.

[0059] In one example, referring to Figure 2, the distance D from the anterior surface of the cornea 01 to the pupil 02 is 3.754 mm.

[0060] In this example, by setting the distance H from the first surface S1 (the anterior surface of the simulated human cornea 01) to the entrance pupil position of the optical lens to be equal to the distance D from the cornea 01 to the pupil 02 in the actual data of the human eye, that is, H = D = 3.754 mm, a high degree of simulation of the structure of the human eye is achieved.

[0061] In the optical design of this application, maintaining the accuracy of key structural parameters is crucial for image quality. Designing the distance H from the first surface S1 of the first lens 1 to the entrance pupil position of the optical lens to be consistent with the distance D from the cornea O1 to the pupil O2 of the human eye helps ensure that the propagation path of light after entering the optical lens is as close as possible to the propagation path in the human eye, thereby reducing optical aberrations caused by differences in optical structure. This design helps improve the sharpness and accuracy of the image, especially when precise testing of the eye-tracking function of optical display devices (such as XR devices) is required.

[0062] For example, in testing XR devices, especially eye-tracking functions, it's necessary to simulate the optical characteristics of the human eye during actual use. By setting the distance H from the first surface S1 of the first lens 1 to the entrance pupil position to match actual human eye data, the testing environment can be made closer to real-world usage scenarios, thereby improving testing accuracy and reliability. This is of great significance for developing XR devices that better meet user needs.

[0063] In summary, the example mentioned in this application achieves a high degree of simulation of the human eye structure and optimization of optical performance by precisely designing the distance H from the first surface S1 of the first lens 1 to the entrance pupil position of the optical lens, making it equal to the distance D (H=D) from the cornea 01 to the pupil 02 in actual human eye data. This design improves the optical testing accuracy of XR devices and the user experience comfort.

[0064] The optical lens provided in this embodiment, as shown in Figure 1, has an object distance set to, for example, 0.5m during testing, ensuring standardized testing conditions. This optical lens design places particular emphasis on simulating the structure of the human eye. The first surface S1 of the first lens 1, serving as the foremost point of the entire optical lens (i.e., the first surface S1 of the optical lens), has a radius of curvature set to 8.91mm to simulate the anterior surface of the cornea O1 of the human eye. Correspondingly, the radius of curvature of the second surface S2 of the first lens 1 is set to 6.7mm to simulate the posterior surface of the cornea O1 of the human eye. Furthermore, the distance H from the first surface S1 of the first lens 1 to the entrance pupil of the optical lens is controlled at 3.754mm, a distance that closely matches the actual distance from the cornea O1 to the pupil O2 of the human eye, further enhancing the simulation accuracy of the optical lens.

[0065] Referring to Figure 1, the total length of the optical lens is carefully designed to be 21.583 mm. This size ensures optical performance while also taking into account the portability and wearing comfort of the device. The field of view (FOV) of the optical lens is designed to be 35°, a parameter that ensures users can obtain a wide and comfortable visual experience when wearing XR devices.

[0066] In terms of imaging quality, the optical lens of this application exhibits superior performance. Referring to Figure 3, the MTF curve shows that at a spatial frequency of 60 lp / mm, the MTF value (modulation transfer function value) is greater than 0.5. This indicates that the optical lens shown in Figure 1 can clearly reproduce image details, ensuring high-quality imaging.

[0067] Furthermore, the optical lens of this application further optimizes image quality by precisely controlling field curvature and distortion. Referring to Figure 4, it can be seen from the field curvature and distortion diagram that the maximum field curvature is effectively controlled within 0.1mm, a very small value that has almost no perceptible impact on image quality. Simultaneously, the maximum distortion is also controlled within approximately 1%, a level of distortion that is virtually imperceptible to the human eye, thus ensuring the realism and naturalness of the image.

[0068] Therefore, it is evident that the human-eye-like optical lens in this application's technical solution fully considers the physiological structural characteristics of the human eye in its design. By precisely controlling various parameters, it achieves a high degree of simulation of the human eye. Simultaneously, it achieves a high standard in imaging quality, meeting the high-precision, high-quality visual presentation requirements of XR devices in the fields of virtual reality and augmented reality.

[0069] In some examples of this application, the size of the aperture 7 matches the size of the pupil 02 of the human eye.

[0070] The aperture design, which matches the size of the human eye pupil, makes the optical lens of this application closer to the real human eye, thereby improving the simulation of the optical performance of XR devices.

[0071] The pupil is a crucial component in eye-tracking technology because it determines the amount of light entering and affects image quality. Matching the size of the aperture 7 to the size of the human pupil 02 ensures that during eye tracking, the path of light through the optical lens is similar to the path through the human pupil, thus improving the accuracy and reliability of eye tracking.

[0072] Furthermore, an appropriately sized aperture 7 can effectively control the amount of light entering the optical lens, preventing excessive or insufficient light from causing a decrease in image quality. An aperture that matches the size of the human eye's pupil can minimize unnecessary light loss, improve light utilization, and thus enhance image sharpness and brightness.

[0073] For example, the size of the aperture 7 can be 3.6mm to 4mm, which can match the pupil size 02 of most people's eyes, making it highly versatile.

[0074] In some examples of this application, referring to Figures 1 and 5, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are all spherical lenses.

[0075] All lenses in this application are designed to be spherical, because spherical lenses are simpler to design and manufacture than aspherical lenses. Specifically, spherical lenses only require controlling a single radius of curvature to achieve light focusing and refraction, without needing to consider the complex design of aspherical surfaces. This design reduces the manufacturing difficulty and cost of optical lenses.

[0076] In optical design, spherical lenses provide excellent image quality. In the optical lens design of this application, excellent image quality is achieved through the careful combination and adjustment of six spherical lenses.

[0077] Spherical lenses have relatively stable optical performance and are not easily affected by changes in the external environment (such as temperature and humidity). This is especially important for XR devices that need to operate for long periods of time or in different environmental conditions.

[0078] More importantly, since the main optical components of the human eye, such as the cornea and lens, can be considered as spherical or near-spherical structures to some extent, using spherical lenses to design human eye-inspired optical lenses can better simulate the optical characteristics of the human eye. This helps improve the simulation accuracy of XR devices during testing.

[0079] Furthermore, in eye-tracking function testing, the spherical lens design more accurately simulates the human eye's reflection and refraction of light, making the test data closer to real-world usage. This is significant for evaluating the eye-tracking performance of XR devices and developing products that better meet user needs.

[0080] In some examples of this application, referring to Figure 1, the third lens 3 and the fourth lens 4 are cemented together to form a cemented lens.

[0081] The optical lens provided in this application embodiment has a cemented lens formed by cementing the third lens 3 and the fourth lens 4 together in the second lens group. This design can bring the following technical effects:

[0082] (1) Optimize the optical performance of the entire optical lens:

[0083] Referring to Figure 1, a cemented lens is introduced behind the aperture stop 7, which can effectively correct various aberrations caused by a single lens, such as spherical aberration and chromatic aberration. Specifically, in this example of the application, the third lens 3 and the fourth lens 4 are spherical lenses, and each may have certain aberrations. However, after cementing them together, by reasonably selecting and configuring parameters such as the curvature, material, and thickness of the lenses, the aberrations of the entire lens group can be significantly improved, thereby improving the image quality.

[0084] Furthermore, the cemented lens design allows for more consistent imaging across different wavelengths, reducing the impact of chromatic aberration on image quality. This helps improve the imaging resolution and color reproduction capabilities of XR devices, enabling users to obtain a clearer and more realistic visual experience.

[0085] (2) Compared to calibrating and assembling multiple independent lenses, it is simpler to calibrate and assemble a cemented lens as a single unit. This helps reduce assembly errors and improve product yield.

[0086] (3) This enables the entire optical lens to highly simulate the human eye:

[0087] The design of cemented lenses, to some extent, conforms to the optical structure of the human eye. The lens and vitreous humor in the human eye can be viewed as a combination of multiple optical elements that work together to achieve clear imaging. In the optical lens design of this application, the introduction of cemented lenses further simulates the optical characteristics of the human eye, improving the simulation accuracy and precision of the testing equipment.

[0088] It should be noted that the optical lens provided in this application includes a first lens 1 to a sixth lens 6, each lens having two surfaces. Referring to Figure 1, the first lens 1 has a first surface S1 and a second surface S2, the second lens 2 has a third surface S3 and a fourth surface S4, the third lens 3 has a fifth surface S5 and a sixth surface S6, the fourth lens 4 has a seventh surface S7 and an eighth surface S8, the fifth lens 5 has a ninth surface S9 and a tenth surface S10, and the sixth lens 6 has an eleventh surface S11 and a twelfth surface S12; wherein, the sixth surface S6 and the seventh surface S7 are bonded together.

[0089] In some examples of this application, referring to FIG5, the sixth lens 6 is configured to be movable along the optical axis to move closer to or further away from the fifth lens 5.

[0090] In the optical lens design provided in the embodiments of this application, the sixth lens 6, which is far from the aperture stop 7 in the second lens group, is designed to be movable along the optical axis. This design enables the optical lens to have a focusing function.

[0091] Specifically, by designing the sixth lens 6 as a movable component, the optical lens achieves dynamic focusing. This function simulates the physiological mechanism by which the lens automatically adjusts its focus to maintain clear imaging when observing objects at different distances. Therefore, this design not only improves the practicality of the optical lens but also makes it more in line with the visual habits of the human eye.

[0092] When the sixth lens 6 moves away from the fifth lens 5 along the optical axis, the focal length of the optical lens increases. This adjustment method ensures that distant images remain sharp, avoiding the blurring problem caused by a fixed focal length. Conversely, when the sixth lens 6 moves closer to the fifth lens 5, the focal length of the optical lens decreases. This adjustment mechanism enables the optical lens to achieve fast focusing and clear imaging.

[0093] Furthermore, by adjusting the position of the sixth lens 6, the overall imaging quality of the optical lens can be optimized. At a specific distance, by fine-tuning the position of the sixth lens 6, the MTF (modulation transfer function) curve of the optical lens can be kept at a high level, ensuring image sharpness and detail.

[0094] The optical lens provided in this application embodiment, as shown in FIG5, has a tenth surface S10, which is the surface of the fifth lens 5 near the sixth lens 6. The optical lens also has an eleventh surface S11 and a twelfth surface S12, which are the two surfaces of the sixth lens 6.

[0095] To extend the imaging range to objects at infinity, the optical solution of this application employs a fine-tuning strategy for the position of the last lens, namely the sixth lens 6. Referring to Figure 5, by reducing the distance between the tenth surface S10 and the eleventh surface S11 (e.g., from 5.453 mm to 5.053 mm), and simultaneously increasing the distance between the twelfth surface S12 and the emitting surface of the rear photosensitive element 8 (i.e., the thirteenth surface S13 shown in Figure 1) (e.g., from 2.02 mm to 2.42 mm), accurate capture and imaging of distant targets is achieved. This adjustment process does not negatively impact the basic performance of the optical lens and ensures excellent optical performance even under extreme imaging conditions.

[0096] Referring to Figure 6, the adjusted MTF curve shows that, across the entire field of view, even at spatial frequencies as high as 60 lp / mm, the MTF value remains stable above 0.5, demonstrating high-fidelity reproduction and clear presentation of image details. Meanwhile, referring to Figure 7, the field curvature of the optical lens is strictly controlled within an extremely small range of less than 0.1 mm, while the distortion level is maintained at approximately 1%, which is imperceptible to the human eye, further confirming the superior image quality performance of this design.

[0097] During the movement of the sixth lens 6, the distortion and field curvature of the optical lens can be observed and adjusted simultaneously. By precisely controlling the position of the sixth lens, distortion and field curvature can be kept within a range imperceptible to the human eye, improving the realism and comfort of the image.

[0098] In some examples of this application, referring to FIG8, the optical lens further includes an eye-tracking component disposed on one side of the first surface S1, and an infrared reflective film is disposed on the first surface S1 of the first lens 1.

[0099] An infrared reflective film is disposed on the first surface S1, which allows most of the infrared light to be reflected when it shines on the first surface S1, rather than passing directly through the optical lens. This reflective property is the basis for eye tracking, because eye tracking components typically need to capture reflected light from the surface of the eye to determine the position and angle of the eye.

[0100] By simulating the shape and characteristics (such as radius of curvature, reflection characteristics, etc.) of the human cornea on the first surface S1 of the first lens 1, the optical lens not only closely resembles the human eye in terms of imaging quality, but also more closely resembles the working principle of the real human eye in terms of eye-tracking function.

[0101] In some examples of this application, referring to FIG8, the eye-tracking component includes an infrared camera 9 and an infrared light source 10; the infrared light emitted by the infrared light source 10 is projected onto the first surface S1, and after being reflected by the infrared reflective film, the infrared camera 9 is able to capture the reflected infrared light.

[0102] In some examples of this application, the optical lens further includes a processor (not shown) for calculating the gaze point information of the optical lens based on the infrared light captured by the infrared camera 9, the gaze point information including the angle and position of the gaze point.

[0103] Referring to Figure 8, the optical lens, in addition to its main optical structure consisting of six spherical lenses, also integrates an eye-tracking component, which is positioned on one side of the first surface S1 (i.e., the anterior surface of the simulated human cornea 01). Simultaneously, an infrared reflective film is specifically provided on the first surface S1. By providing the infrared reflective film on the first surface S1, and in conjunction with the eye-tracking component (such as an infrared light source 10 and an infrared camera 9), precise tracking of the eyes of users wearing devices such as XR devices can be achieved.

[0104] Specifically, the infrared light emitted by the infrared light source 10 illuminates the infrared reflective film on the first surface S1, and the reflected infrared light is subsequently captured by the infrared camera 9. Combined with an eye-tracking algorithm, the gaze angle and position of the optical lens can be calculated, achieving high-precision eye tracking.

[0105] Eye-tracking is crucial in XR devices, enabling them to respond more intelligently to changes in the user's gaze and provide a more personalized interactive experience.

[0106] According to this example of the application, the first surface S1 simulates the anterior surface of the human cornea O1, and its parameters such as radius of curvature and material selection are similar to those of the human eye. By setting an infrared reflective film on the first surface S1, not only is the functionality of the optical lens enhanced, but the lens also becomes more closely resembles the actual structure of the human eye in appearance, thus improving the simulation accuracy.

[0107] This design is particularly important for scenarios that require testing the eye-tracking capabilities of XR devices. It simulates the behavior of the human eye when receiving and reflecting infrared light, thus allowing for a more accurate evaluation of the device's eye-tracking performance.

[0108] The reflected infrared light captured by the infrared camera 9 carries crucial information about the gaze point of the optical lens, which is then used to calculate the angle and position of the gaze point.

[0109] For example, the processor integrated in the optical lens is responsible for receiving and processing the reflected light data transmitted from the infrared camera 9. Through algorithmic processing, the processor can parse the gaze point information contained in this data, including the angle and position of the gaze point.

[0110] In some examples of this application, the optical test module includes an optical lens and a photosensitive element 8 as described in any of the preceding claims, see Figures 1, 5 and 8, wherein the photosensitive element 8 is located on the side of the second lens group opposite to the aperture stop 7.

[0111] The main function of the photosensitive element 8 is to convert the light entering through the optical lens into an electrical signal. In order to obtain good imaging results under various lighting conditions, the photosensitive element needs to have high sensitivity so that it can capture enough information in low light and avoid overexposure in strong light.

[0112] The following is a detailed description using Example 1.

[0113] Example 1

[0114] Referring to the optical lens shown in Figure 1, from the perspective of optical structure, it includes two lens groups: namely, the first lens group and the second lens group, and an aperture stop 7 is provided between the first lens group and the second lens group;

[0115] The first lens group includes a first lens 1 and a second lens 2 arranged sequentially along the optical axis. The first lens 1 includes a first surface S1 and a second surface S2, and the second lens 2 includes a third surface S3 and a fourth surface S4.

[0116] The second lens group includes a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged sequentially along the optical axis. The third lens 3 includes a fifth surface S5 and a sixth surface S6. The fourth lens 4 includes a seventh surface S7 and an eighth surface S8. The fifth lens 5 includes a ninth surface S9 and a tenth surface S10. The sixth lens 6 includes an eleventh surface S11 and a twelfth surface S12. The sixth surface S6 and the seventh surface S7 are cemented together.

[0117] The aperture stop 7 is located between the second lens 2 and the third lens 3;

[0118] Furthermore, a photosensitive element 8 is provided on the side of the sixth lens 6 that is opposite to the fifth lens 5.

[0119] The specific optical parameters of the optical lens provided in this embodiment 1 can be found in Table 1 below.

[0120] Table 1

[0121]

[0122] The specific implementation of the optical testing module in this application can refer to the above-described embodiments of the optical lens. Therefore, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0123] The above embodiments mainly describe 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. For the sake of brevity, they will not be elaborated here.

[0124] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. An optical lens, characterized in that, The system includes a first lens group, an aperture stop (7), and a second lens group arranged sequentially along the same optical axis. The first lens group includes a first lens (1) and a second lens (2) arranged along the optical axis, with the second lens (2) located on the side closer to the aperture stop (7). The second lens group includes a third lens (3), a fourth lens (4), a fifth lens (5), and a sixth lens (6) arranged along the optical axis, wherein the third lens (3) is located on the side closer to the aperture stop (7), and the sixth lens (6) is located on the side farther from the aperture stop (7). The first lens (1) includes a first surface (S1) farther from the aperture stop (7) and a second surface (S2) closer to the aperture stop (7). The radius of curvature of the first surface (S1) is the same as the radius of curvature of the anterior surface of the cornea (01) of the human eye, and the radius of curvature of the second surface (S2) is the same as the radius of curvature of the posterior surface of the cornea (01) of the human eye.

2. The optical lens according to claim 1, characterized in that, The distance from the first surface (S1) to the entrance pupil position of the optical lens is H, and the distance from the cornea (01) of the human eye to the pupil (02) is D. Then H satisfies: H = D.

3. The optical lens according to claim 1, characterized in that, The size of the aperture (7) is matched to the size of the pupil (02) of the human eye.

4. The optical lens according to any one of claims 1-3, characterized in that, The first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5) and the sixth lens (6) are all spherical lenses.

5. The optical lens according to claim 4, characterized in that, The third lens (3) and the fourth lens (4) are glued together to form a glued lens.

6. The optical lens according to claim 4, characterized in that, The sixth lens (6) is configured to move along the optical axis to approach or move away from the fifth lens (5).

7. The optical lens according to claim 5, characterized in that, The optical lens also includes an eye-tracking component, which is disposed on one side of the first surface (S1); and an infrared reflective film is disposed on the first surface (S1) of the first lens (1).

8. The optical lens according to claim 7, characterized in that, The eye-tracking component includes an infrared camera (9) and an infrared light source (10); the infrared light emitted by the infrared light source (10) is projected onto the first surface (S1), and after being reflected by the infrared reflective film, the infrared camera (9) is used to capture the infrared light reflected by the infrared reflective film.

9. The optical lens according to claim 8, characterized in that, The optical lens also includes a processor for calculating the gaze point information of the optical lens based on the infrared light captured by the infrared camera (9), the gaze point information including the angle and position of the gaze point.

10. The optical lens according to claim 1, characterized in that, The optical lens also includes a photosensitive element (8), which is located on the side of the second lens group away from the aperture stop (7).

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