AR lens modules and optical display devices

Abstract

This application provides an AR lens module and an optical display device; wherein, the AR lens module includes a lens group and a display chip arranged along the same optical axis; the lens group consists of a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged sequentially, the fifth lens being arranged adjacent to the display chip; the first lens to the fourth lens are plastic aspherical lenses, and the fifth lens is a glass aspherical lens; wherein, the first lens is a biconvex lens, and the effective focal length F1 of the first lens is 3.6mm to 4.3mm.

Description

Technical Field

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

[0002] In the field of augmented reality (AR) technology, the size and weight of a device have a significant impact on user comfort. Currently, the size and weight of AR devices are mainly limited by their complex internal optical module designs. For example, traditional AR lens modules typically contain complex illumination optical paths, which not only increases the overall size of the device but also results in a heavier weight, thus reducing the user's wearing experience. Furthermore, in the pursuit of miniaturization, existing AR lens modules often struggle to maintain image quality, leading to frequent issues such as image distortion and astigmatism, which negatively impact the user's visual experience.

[0003] Therefore, developing an AR lens module that can significantly reduce size and weight while ensuring excellent imaging quality has become a key issue that urgently needs to be addressed in the field of augmented reality technology. Summary of the Invention

[0004] The purpose of this application is to provide a new technical solution for an AR lens module and an optical display device.

[0005] In a first aspect, this application provides an AR lens module. The AR lens module is used in a green optical engine and includes a lens group and a display chip arranged along the same optical axis; the lens group consists of a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially, with the fifth lens arranged adjacent to the display chip;

[0006] The first to the fourth lenses are plastic aspherical mirrors, and the fifth lens is a glass aspherical mirror;

[0007] The first lens is a biconvex lens, and the effective focal length F1 of the first lens is 3.6mm to 4.3mm.

[0008] Optionally, the first lens to the fifth lens are all bent toward the air gap between the third lens and the fourth lens.

[0009] Optionally, the CRA of the AR lens module is 14°, and CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0010] Optionally, the AR lens module satisfies: 8.4 < (F1 + F2 + F5) / L < 14; where F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F5 is the effective focal length of the fifth lens, and L is the total optical length of the AR lens module.

[0011] Optionally, the AR lens module satisfies: -9.8 < (F3 + F4) / L < -5.5; where F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, and L is the total optical length of the AR lens module.

[0012] Optionally, the effective focal length F2 of the second lens is 9.1 mm to 10.2 mm;

[0013] The effective focal length F5 of the fifth lens is 36 mm to 54 mm.

[0014] Optionally, the effective focal length F3 of the third lens is -3.1 mm to -2.3 mm;

[0015] The effective focal length F4 of the fourth lens is -48 mm to -30 mm.

[0016] Optionally, the AR lens module satisfies: 2.1 < (A3 + A4) / (A1 + A2 + A5) < 2.8; where A1 is the air gap between the first lens and the second lens, A2 is the air gap between the second lens and the third lens, A3 is the air gap between the third lens and the fourth lens, A4 is the air gap between the fourth lens and the fifth lens, and A5 is the air gap between the fifth lens and the display chip.

[0017] Optionally, the AR lens module satisfies: 6.1 < L / (A1 + A2 + A5) < 12.2; where L is the total optical length of the AR lens module.

[0018] Optionally, the AR lens module satisfies: 3.3 < L / (A3 + A4) < 4.2.

[0019] Optionally, the AR lens module includes an aperture, and the aperture is located on the side of the first lens away from the second lens;

[0020] The air gap between the aperture and the first lens is ≤ 0.3 mm;

[0021] The aperture diameter is 3.3 mm to 3.6 mm.

[0022] Optionally, the total optical length L of the AR lens module is 5.6 mm;

[0023] The maximum effective aperture of the AR lens module is 3.4mm.

[0024] Secondly, this application provides an optical display device. The optical display device includes:

[0025] The AR lens module as described in the first aspect; and

[0026] The aperture of the aperture stop of the AR lens module is matched with the entrance pupil diameter of the optical waveguide device.

[0027] The beneficial effects of this application are as follows:

[0028] The AR lens module provided in this application replaces some glass lenses with plastic lenses, which not only reduces the weight of the AR lens module but also lowers production costs. In this application, the first lens, which is farthest from the display chip, is designed with positive optical power, and its effective focal length shows a relatively large positive optical power. This allows the first lens to converge light within a shorter focal length, thereby helping to reduce the size of the AR lens module and make it more compact. The surface of the first lens is plano-convex and aspherical. The plano-convex design aims to effectively reduce the angle of light and control the aperture of the AR lens module, while the aspherical design aims to significantly reduce spherical aberration that may be caused by a large aperture, thereby significantly improving image quality.

[0029] 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

[0030] 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.

[0031] Figure 1 This is one of the structural schematic diagrams of the AR lens module provided in the embodiments of this application;

[0032] Figure 2 The optical path diagram of the AR lens module provided in the embodiments of this application;

[0033] Figure 3 for Figure 2 Distortion diagram of the provided AR lens module;

[0034] Figure 4 for Figure 2 The modulation transfer function diagram of the provided AR lens module;

[0035] Figure 5 This is the second schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

[0036] Figure 6 for Figure 5 The modulation transfer function diagram of the provided AR lens module;

[0037] Figure 7 This is the third schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

[0038] Figure 8 for Figure 7 The modulation transfer function diagram of the provided AR lens module;

[0039] Figure 9 This is the fourth schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

[0040] Figure 10 for Figure 9 The modulation transfer function diagram of the provided AR lens module;

[0041] Figure 11 Fifth schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

[0042] Figure 12 for Figure 11 The provided modulation transfer function diagram for the AR lens module.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Display chip. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The AR lens module and optical display device provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0051] According to one embodiment of this application, an AR lens module is provided, see [link to relevant documentation]. Figure 1 The AR lens module is used for a green optical engine and includes a lens group and a display chip 6 arranged along the same optical axis. The lens group consists of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5 arranged sequentially. The fifth lens 5 is arranged adjacent to the display chip 6. The first lens 1 to the fourth lens 4 are plastic aspherical lenses, and the fifth lens 5 is a glass aspherical lens. The first lens 1 is a biconvex lens, and the effective focal length F1 of the first lens 1 is 3.6mm to 4.3mm.

[0052] The AR lens module provided in this application is an ultra-miniaturized AR lens module for a single green AR lens. The AR lens module of this application achieves miniaturization, weight reduction, and guaranteed image quality.

[0053] The AR lens module provided in this application is a miniaturized AR lens design for a single green AR lens. This lens module can be specifically designed to transmit monochromatic light, such as green light. In AR applications, image information is typically overlaid on a view of the real world. Green, as a widely distributed color in nature, is important for presenting realism and enhancing visual effects. Therefore, optimizing for green light can enhance the realism of AR displays and the user experience.

[0054] The AR lens module provided in this application embodiment is described in [reference]. Figure 1 It mainly consists of a lens group and a display chip 6. Specifically, the lens group consists of five lenses (first lens 1 to fifth lens 5) arranged sequentially along the same optical axis. This arrangement helps to ensure the orderly transmission of light and control of image quality.

[0055] The AR lens module provided in this application embodiment is referred to... Figure 1 The lens group consists of five lenses. The first lens 1 to the fourth lens 4, which are close to the aperture, are all made of plastic aspherical mirrors, while the fifth lens 5, which is adjacent to the display chip 6, is a glass aspherical mirror.

[0056] Plastic lenses are significantly lighter than glass lenses. In AR optical display devices (such as AR smart glasses), reducing the weight of the AR lens module is crucial for improving user comfort. This application designs four of the five lenses (first lens 1 to fourth lens 4) to be made of plastic, which can significantly reduce the overall weight of the AR lens module. Furthermore, plastic lenses are not only lightweight but also relatively easy to process into complex aspherical shapes, which helps reduce the size of the AR lens module, making the entire AR optical display device more compact.

[0057] In this application, all five lenses in the lens group are designed aspherical, which can effectively reduce aberrations (such as spherical aberration, coma, etc.), improve imaging quality, and ensure that the AR optical display device provides clear and accurate images.

[0058] It should be noted that although plastic lenses have advantages in weight and processability, they may not be as good as glass lenses in certain properties, such as light transmission and thermal stability. Therefore, in this application, by designing the fifth lens 5 as a glass aspherical mirror, the heat generated by the display chip 6 during operation can be avoided from affecting the lens assembly.

[0059] In this application, the fifth lens 5, located near the display chip 6, is designed as a glass aspherical lens. This is because the fifth lens 5 is close to the display chip 6, which may generate heat during operation. Due to its high thermal stability, the glass lens can better withstand this heat without significant deformation or degradation of optical performance. This helps maintain the stability and consistency of the module.

[0060] The image quality generated by the display chip 6 is directly affected by the lens group. Designing the fifth lens as a glass aspherical lens allows for more effective control of light transmission and focusing, reducing scattering and distortion of light as it passes through the lens. This is crucial for improving the resolution, contrast, and color accuracy of the AR lens module.

[0061] Therefore, the lens group of this application can maintain the overall lightweight design while ensuring that key optical performance is not affected, thereby further improving image quality.

[0062] The AR lens module provided in this application embodiment has a first lens 1 designed as a biconvex lens.

[0063] Specifically, see Figure 1The first lens 1 is located on the side near the aperture stop. As a biconvex lens, the first lens 1 helps to narrow the angle of light, thereby controlling the aperture of the AR lens module and thus helping to reduce spherical aberration and improve image quality. For example, the maximum effective aperture of the AR lens module of this application is 3.4mm, which is much lower than that of existing AR lens systems.

[0064] The effective focal length F1 of the first lens 1 is 3.6mm to 4.3mm. This is a relatively short effective focal length range.

[0065] In optical design, the shorter the effective focal length, the greater the optical power of the lens. Optical power is the reciprocal of the lens focal length, denoted by Φ, i.e., Φ = 1 / F. In this application, the effective focal length F1 of the first lens 1 is in the range of 3.6mm to 4.3mm, which means that the optical power Φ of the first lens 1 is between approximately 0.23 (1 / 4.3) and approximately 0.28 (1 / 3.6), and this range of optical power is relatively large.

[0066] A higher optical power means that the first lens 1 has a stronger light-converging ability, which helps to form a clear image at a shorter distance.

[0067] The design range of the effective focal length F1 of the first lens 1 also helps to optimize the focal length distribution of the entire AR lens module. By reasonably allocating the focal length of each lens at different positions, it can be ensured that light can be correctly focused, while maintaining the compactness of the AR lens module.

[0068] In AR optical display devices, size and weight are key factors. The compact design of the first lens 1 (shorter focal length and greater optical power) helps to achieve a smaller AR lens module size, thereby improving wearing comfort.

[0069] In the lens group of this application, the first lens 1 has a relatively high optical power, mainly reflected in its short effective focal length range (3.6mm to 4.3mm). This high optical power gives the first lens 1 a strong light-converging ability, which helps to reduce the light angle, control the AR lens module aperture, reduce spherical aberration, and improve image quality. At the same time, this design also helps to optimize focal length allocation and maintain the compactness of the AR lens module, meeting the stringent size and weight requirements of AR optical display devices.

[0070] In summary, the AR lens module provided in this application replaces some glass lenses with plastic lenses, which not only reduces the weight of the AR lens module but also lowers production costs. In this application, the first lens 1, which is farthest from the display chip 6, is designed with positive optical power, and its effective focal length shows that its positive optical power is relatively large. This allows the first lens 1 to converge light within a shorter focal length, thereby helping to reduce the size of the AR lens module and make it more compact. The surface of the first lens 1 is plano-convex and aspherical. The plano-convex design aims to effectively reduce the angle of light and control the aperture of the AR lens module, while the aspherical design aims to significantly reduce spherical aberration that may be caused by a large aperture, thereby significantly improving image quality.

[0071] See some examples in this application. Figure 1 The first lens 1 to the fifth lens 5 are all bent toward the air gap between the third lens 3 and the fourth lens 4.

[0072] In this example of the application, the AR lens module exhibits a symmetrical architecture design, wherein all five lenses are bent toward the center of the AR lens module—that is, the air gap between the third lens 3 and the fourth lens 4, see [link to relevant documentation]. Figure 1 This design can reduce distortion and astigmatism. Distortion manifests as unnatural curvature of straight lines in an image, while astigmatism refers to the inability of light rays to focus precisely on a single point, resulting in impaired image sharpness.

[0073] In this example of the application, the first lens 1 through the fifth lens 5 are all bent toward the air gap between the third lens 3 and the fourth lens 4. This design optimizes the optical path, ensuring that light can pass through the AR lens module along a predetermined path.

[0074] Furthermore, the symmetrical design of the optical architecture provided in this application not only maintains excellent optical performance but also facilitates the miniaturization of the AR lens module. By arranging the first lens 1 to the third lens 3 and the fourth lens 4 to the fifth lens in a nearly mirror-symmetrical manner, this application achieves a reduction in the overall size of the AR lens module without sacrificing any optical specifications. This feature is of paramount value for space-constrained AR optical display devices and similar applications.

[0075] In summary, the AR lens module design of this application not only ensures image quality but also fully considers the space constraints in practical applications.

[0076] In some examples of this application, the CRA of the AR lens module is 14°, and CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip 6.

[0077] The size of the CRA affects the volume of the AR lens module. A larger CRA means that the angle of incidence of light when entering the AR lens module is larger, which helps to reduce the length of the AR lens module along the optical axis while maintaining the same field of view, thereby achieving a reduction in the size of the AR lens module.

[0078] The AR lens module of this application embodiment has a 14° CRA, that is, the angle between the principal ray of the edge field of view and the optical axis of the display chip 6 is 14°. This angle can ensure a sufficient field of view (e.g., 13°±1°) to meet the user's visual needs, and can also minimize the vertical size of the AR lens module. This helps to make the entire AR optical display device more compact and convenient for users to wear and use.

[0079] The size of the CRA is also directly related to the light energy utilization rate. In the AR lens module, the light energy utilization rate refers to the proportion of light emitted by the display chip 6 that ultimately reaches the user's eyes and is effectively utilized.

[0080] In this application, by combining optimized lens curvature, thickness, and materials, light loss is reduced and light energy utilization is improved while maintaining a large CRA.

[0081] Furthermore, a larger CRA (Cost Reduction Aspect Ratio) helps reduce the impact of stray light. Stray light refers to light rays that do not travel along a predetermined path and interfere with image quality. By setting a reasonable CRA, the generation and propagation of stray light can be effectively suppressed, further improving image quality.

[0082] In this application, the CRA of the AR lens module is set to 14°, which not only reduces the size of the AR lens module and improves the light energy utilization rate, but also optimizes the overall performance of the AR lens module to a certain extent. For example, it helps to reduce aberrations (such as distortion and astigmatism) of the AR lens module and improve the clarity of the image.

[0083] In some examples of this application, the effective focal length F2 of the second lens 2 is 9.1 mm to 10.2 mm; and the effective focal length F5 of the fifth lens 5 is 36 mm to 54 mm.

[0084] According to this example of the present application, in the lens group, in addition to the first lens 1 having positive optical power, the second lens 2 and the fifth lens 5 are also designed as positive optical power lenses. That is to say, the AR lens module of the present application has a total of three lenses with positive optical power, namely the first lens 1, the second lens 2 and the fifth lens 5.

[0085] The effective focal length F2 of the second lens 2 is set between 9.1 mm and 10.2 mm, and its optical power Φ2 = 1 / F2, so the range of Φ2 is approximately 0.098 to 0.110.

[0086] The effective focal length F5 of the fifth lens 5 is set between 36mm and 54mm, and its optical power Φ5 = 1 / F5, so the range of Φ5 is approximately 0.019 to 0.028.

[0087] Positive focal length lenses converge light rays, helping to focus the light from the display chip 6 onto a predetermined imaging plane. In this example, the positive focal length design of the second lens 2 and the fifth lens 5 ensures that light rays are effectively converged when passing through these lenses, thereby enhancing the imaging capability of the entire AR lens module. Furthermore, the longer effective focal length (especially the fifth lens 5) helps control light diffusion, further improving image clarity and resolution.

[0088] In some examples of this application, the effective focal length F3 of the third lens 3 is -3.1mm to -2.3mm; and the effective focal length F4 of the fourth lens 4 is -48mm to -30mm.

[0089] The AR lens module provided in this application embodiment also includes two lenses with negative optical power: a third lens 3 and a fourth lens 4.

[0090] The effective focal length F3 of the third lens 3 is set between -3.1mm and -2.3mm, and its optical power Φ3 = 1 / F3. Therefore, the range of Φ3 is approximately -0.323 to -0.435 (negative value).

[0091] The effective focal length F4 of the fourth lens 4 is set between -48mm and -30mm, and its optical power Φ4 = 1 / F4. Therefore, the range of Φ4 is approximately -0.021 to -0.033 (negative value).

[0092] Negative focal length lenses have the function of diverging light, which can be used to correct aberrations, adjust the optical path, or achieve specific imaging effects. In this example of the application, the negative focal length design of the third lens 3 and the fourth lens 4 effectively corrects aberrations introduced by other lenses (especially positive focal length lenses) and helps adjust the optical path to ensure that light can propagate to the imaging plane along a predetermined path. At the same time, the shorter negative effective focal length (especially the third lens 3) helps to further reduce the size of the AR lens module and achieve a more compact design.

[0093] In one example of this application, the lens group consists of a first lens 1 to a fifth lens, wherein the effective focal length F1 of the first lens 1 is 3.6mm to 4.3mm, the effective focal length F2 of the second lens 2 is 9.1mm to 10.2mm, the effective focal length F3 of the third lens 3 is -3.1mm to -2.3mm, the effective focal length F4 of the fourth lens 4 is -48mm to -30mm, and the effective focal length F5 of the fifth lens 5 is 36mm to 54mm.

[0094] This application achieves control over the light propagation path by combining five specially designed lenses with their effective focal lengths (in order of positive, positive, negative, negative, and positive). This enhances the imaging capabilities of the AR lens module while simultaneously miniaturizing its size. The converging effect of the positive focal length lens and the diverging effect of the negative focal length lens work together to optimize the optical performance of the entire AR lens module, providing users with a clearer and more comfortable augmented reality visual experience.

[0095] The effective focal length settings of the first lens 1 to the fifth lens 5 together constitute a sophisticated AR lens module that provides high-quality imaging while maintaining a compact design. This application has meticulously designed the focal length of each lens in the lens group to ensure they work together to correct various aberrations and improve the overall performance of the AR lens module.

[0096] In some examples of this application, the AR lens module satisfies: 8.4 < (F1 + F2 + F5) / L < 14; where F1 is the effective focal length of the first lens 1, F2 is the effective focal length of the second lens 2, F5 is the effective focal length of the fifth lens 5, and L is the total optical length of the AR lens module.

[0097] In the AR lens module provided in this application, the effective focal length F1 of the first lens 1, the effective focal length F2 of the second lens 2, and the effective focal length F5 of the fifth lens 5 are all positive, which means that the optical power of the three lenses is positive.

[0098] When (F1+F2+F5) / L<14, and L, i.e., the total optical length of the AR lens module, is fixed at 5.6mm, this condition limits the ratio between the sum of the effective focal lengths of the first lens 1, the second lens 2, and the fifth lens 5 and the total optical length of the entire AR lens module. This ensures a reasonable distribution of optical power within the AR lens module. It avoids a single lens bearing excessive optical power, thereby reducing the impact of manufacturing errors on image quality.

[0099] Uniform optical power distribution can also reduce the complexity of AR lens module design. In optical design, it is not necessary to rely excessively on one or a few lenses to correct aberrations; instead, better imaging results can be achieved through the synergistic effect of multiple lenses.

[0100] When (F1+F2+F5) / L is greater than 8.4, L, the total optical length of the AR lens module, has a certain limiting effect. If L is too large, to meet this ratio condition, the sum of F1, F2, and F5 will have to become larger, which will lead to uneven distribution of optical power and may even exceed material or design limitations. Therefore, this condition helps to control the size of the module within a reasonable range. A smaller module size not only improves wearing comfort but also helps to achieve more compact AR devices.

[0101] According to this example, by setting upper and lower limits for (F1+F2+F5) / L, the overall size of the AR lens module can be indirectly controlled. This ensures that the AR lens module can meet optical performance requirements while maintaining a compact structure.

[0102] In summary, when an AR lens module meets the condition 8.4 < (F1 + F2 + F5) / L < 14, especially when F1, F2, and F5 are all positive optical powers, this condition helps to achieve uniform distribution of optical power, reduce tolerance sensitivity, control the overall size of the AR lens module, and improve image quality. These benefits work together in the design and optimization process of AR lens modules, contributing to the design of high-performance, low-cost, and easy-to-manufacture AR lens modules.

[0103] In some examples of this application, the AR lens module satisfies: -9.8 < (F3 + F4) / L < -5.5; where F3 is the effective focal length of the third lens 3, F4 is the effective focal length of the fourth lens 4, and L is the total optical length of the AR lens module.

[0104] The AR lens module provided in this application embodiment, in addition to satisfying the condition 8.4 < (F1 + F2 + F5) / L < 14 mentioned in the above example, also satisfies the condition in this example of the application: -9.8 < (F3 + F4) / L < -5.5. It should be noted that the focal lengths of the third lens 3 and the fourth lens 4 are negative, which means that the optical power of both lenses is negative. This example of the application reasonably adjusts the distribution of negative optical power in the AR lens module.

[0105] According to the conditions proposed in this example of the application, the ratio between the sum of the effective focal lengths of the third lens 3 and the fourth lens 4 and the total optical length L of the entire AR lens module is constrained, ensuring a reasonable distribution of negative optical power throughout the entire AR lens module. By setting upper and lower limits for the ratio, the distribution of negative optical power of the two lenses can be optimized while maintaining the compact structure of the entire AR lens module, avoiding design problems caused by excessively small or large optical power of a single lens.

[0106] See Figure 1 The third lens 3 and the fourth lens 4 are located in the middle of the entire lens group. The reasonable distribution of optical power of these two lenses can reduce aberrations and improve imaging clarity, especially in the balance between the central field of view and the edge field of view.

[0107] The constraints mentioned in this example, avoiding extreme optical power allocation, help reduce the impact of manufacturing errors on image quality and improve module stability. At the same time, a reasonable optical power allocation also helps reduce the manufacturing difficulty of the lens and improve production efficiency.

[0108] This application utilizes a lens combination with carefully controlled negative optical power to further optimize the structure of the AR lens module without sacrificing image quality. For example, a more compact optical structure helps reduce the size and weight of the AR optical engine, and even the AR optical display device, thereby improving wearing comfort.

[0109] In the AR lens module of this application, lenses with positive and negative optical power need to work together to achieve high-quality imaging. When the ratio of the negative optical power lens combination (F3+F4) to the total optical length L of the entire AR lens module meets the above conditions, it helps to achieve a balance of optical power in the module. This balance is crucial for reducing aberrations and improving imaging quality indicators such as resolution.

[0110] Similar to positive power lenses, the manufacturing tolerances of negative power lenses also affect the overall performance of AR lens modules. For example, when the value of (F3+F4) / L is controlled within the range shown in the example above, the sensitivity of the AR lens module to the manufacturing tolerances of individual lenses can be reduced. This helps improve product yield and consistency, and reduces manufacturing costs.

[0111] In one example of this application, the AR lens module satisfies: 8.4 < (F1 + F2 + F5) / L < 14, and -9.8 < (F3 + F4) / L < -5.5; where F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, and L is the total optical length of the AR lens module.

[0112] When both ratio conditions in the above example are met simultaneously, it indicates that the AR lens module has achieved structural optimization and balance. It ensures sufficient positive optical power to converge light while simultaneously dispersing light through reasonable negative optical power, keeping the overall AR lens module compact. When both ratio conditions are satisfied, the AR lens module can also provide clear, distortion-free images over a wider field of view. Furthermore, these two ratio conditions also help improve the manufacturability of the AR lens module. By precisely controlling the parameters and combination of each lens, tolerance requirements during manufacturing can be reduced, improving product yield and consistency.

[0113] The total optical length of the AR lens module provided in this embodiment is 5.6mm.

[0114] In some examples of this application, the AR lens module satisfies: 2.1 < (A3 + A4) / (A1 + A2 + A5) < 2.8; where A1 is the air gap between the first lens 1 and the second lens 2, A2 is the air gap between the second lens 2 and the third lens 3, A3 is the air gap between the third lens 3 and the fourth lens 4, A4 is the air gap between the fourth lens 4 and the fifth lens 5, and A5 is the air gap between the fifth lens 5 and the display chip 6.

[0115] The constraint described in this example of the application is: 2.1<(A3+A4) / (A1+A2+A5)<2.8, which expresses the proportional relationship of the air gap between adjacent optical elements in the AR lens module.

[0116] Wherein, A3 and A4 are the air gaps between the third lens 3 and the fourth lens 4, and between the fourth lens 4 and the fifth lens 5, respectively. A1, A2, and A5 are the air gaps between the first lens 1 and the second lens 2, between the second lens 2 and the third lens 3, and between the fifth lens 5 and the display chip 6, respectively. In this example of the application, the inequality requires that the ratio of (A3+A4) to (A1+A2+A5) be between 2.1 and 2.8.

[0117] By controlling the proportions of these air gaps (A1, A2, A3, A4, A5), aberration correction in the AR lens module can be optimized, particularly reducing higher-order aberrations such as coma and field curvature. Appropriate air gap proportions contribute to improved image quality of the AR lens module, especially at the edges of the field of view. Furthermore, this design helps control the overall length of the AR lens module, maintaining its compactness.

[0118] When the ratio of (A3 + A4) to (A1 + A2 + A5) is greater than 2.1, it is possible to avoid the AR lens module being too compact, thus leaving enough space for aberration correction and light management. A ratio greater than 2.1 helps to achieve reasonable volume control while maintaining the high performance of the AR lens module. This contributes to better wearing comfort in augmented reality devices.

[0119] When the ratio of (A3 + A4) to (A1 + A2 + A5) is less than 2.8, the aberration in the AR lens module can be effectively controlled. This is because an excessive ratio of (A3 + A4) may lead to too long optical paths, increasing the chance of aberration generation. In this application, by maintaining an appropriate ratio, it can be ensured that the AR lens module provides high-quality imaging throughout the entire field of view, especially in the peripheral field of view. In addition, a smaller ratio also helps to maintain the compactness of the AR lens module, because an excessive air gap will occupy more space, which is not conducive to achieving a miniaturized design.

[0120] In some examples of this application, the AR lens module satisfies: 6.1 < L / (A1 + A2 + A5) < 12.2; where L is the total optical length of the AR lens module.

[0121] The constraint condition described in this example of this application is 6.1 < L / (A1 + A2 + A5) < 12.2. This inequality focuses on the ratio relationship between the total optical length L of the AR lens module and the sum of specific air gaps (A1 + A2 + A5). This inequality requires the ratio of L to (A1 + A2 + A5) to be between 6.1 and 12.2. By constraining the ratio of the total optical length L to the key air gaps, the optical performance of the AR lens module can be optimized, especially in controlling distortion and astigmatism.

[0122] This constraint design in this example of this application helps to ensure that the AR lens module has sufficient back focal space while maintaining compactness, facilitating coupling with subsequent optical components such as optical waveguides. In addition, an appropriate ratio also helps to improve the manufacturing tolerance of the AR lens module, reducing production difficulty and cost.

[0123] Specifically, when the ratio of the total optical length L to (A1 + A2 + A5) is greater than 6.1, it can be ensured that the AR lens module has sufficient back focal space. This is crucial for coupling with subsequent optical components such as optical waveguide devices, helping to achieve clear and distortion-free imaging. This ratio relationship helps to reduce light loss during propagation and improve light energy utilization. This is particularly important for augmented reality devices, because high light energy utilization means a brighter and clearer display effect.

[0124] When the ratio of the total optical length L to (A1 + A2 + A5) is less than 12.2, it can ensure that the AR lens module maintains structural compactness. This is crucial for augmented reality devices because a compact structure helps improve wearing comfort. A smaller ratio means that the lenses and air gaps in the AR lens module can be arranged more closely, which helps reduce manufacturing costs and improve production efficiency. The ratio limit less than 12.2 controls the volume of the AR lens module while maintaining its high performance. This balance helps achieve a better user experience in augmented reality devices.

[0125] In some examples of the present application, the AR lens module satisfies: 3.3 < L / (A3 + A4) < 4.2.

[0126] The AR lens module provided by this example of the present application satisfies: 3.3 < L / (A3 + A4) < 4.2. The lower limit value of 3.3 ensures that the total optical length L is not too short relative to the air gap (A3 + A4). If the value of L / (A3 + A4) is less than 3.3, it means that the AR lens module is too compact, which may lead to a decline in optical performance. The upper limit value of 4.2 restricts the excessive growth of the total optical length L relative to the air gap (A3 + A4). If the value of L / (A3 + A4) is greater than 4.2, it means that the AR lens module is too long, which is not conducive to the compact design of the device and may also increase manufacturing costs and difficulties.

[0127] According to the constraint condition provided by this example of the present application: 3.3 < L / (A3 + A4) < 4.2. It enables the AR lens module to maintain good optical performance. An appropriate air gap helps reduce aberration and improve imaging quality. At the same time, a reasonable total optical length also helps ensure the stability and accuracy of light during transmission.

[0128] By controlling the ratio of L / (A3 + A4), it is possible to achieve the structural compactness of the AR lens module while ensuring optical performance. This is particularly important for augmented reality (AR) devices because a compact structure helps improve wearing comfort.

[0129] An appropriate air gap and total optical length help reduce the loss of light during transmission and improve the light energy utilization rate. A high light energy utilization rate means a brighter and clearer display effect.

[0130] Under the condition of satisfying this inequality, the AR lens module of the present application can be more easily integrated with other optical components (such as waveguide devices, etc.).

[0131] In addition, by optimizing the ratio of L / (A3+A4), it is easier to control the size and positional relationship of each optical component during the manufacturing process, thereby improving the manufacturing efficiency and yield.

[0132] In an example of the present application, the AR lens module satisfies: 2.1 < (A3+A4) / (A1+A2+A5) < 2.8, 6.1 < L / (A1+A2+A5) < 12.2, and 2.3 < L / (A2+A3+A4) < 3.1; where A1 is the air gap between the first lens 1 and the second lens 2, A2 is the air gap between the second lens 2 and the third lens 3, A3 is the air gap between the third lens 3 and the fourth lens 4, A4 is the air gap between the fourth lens 4 and the fifth lens 5, A5 is the air gap between the fifth lens 5 and the display chip 6, and L is the total optical length of the AR lens module.

[0133] When the AR lens module simultaneously satisfies the three ratio conditions of 2.1 < (A3+A4) / (A1+A2+A5) < 2.8, 6.1 < L / (A1+A2+A5) < 12.2, and 2.3 < L / (A2+A3+A4) < 3.1, it can optimize the optical path while maintaining the compactness of the AR lens module, thereby improving the imaging quality.

[0134] In some examples of the present application, the AR lens module includes an aperture stop, and the aperture stop is located on the side of the first lens 1 facing away from the second lens 2; the air gap between the aperture stop and the first lens 1 ≤ 0.3 mm; the aperture of the aperture stop is 3.3 mm to 3.6 mm.

[0135] Among them, the aperture stop is located on the side of the first lens 1 facing away from the second lens 2, that is, the aperture stop is located at the front end of the AR lens module.

[0136] The air gap between the aperture stop and the first lens 1 ≤ 0.3 mm, and the smaller air gap helps to reduce the diffusion and loss of light during transmission, further improving the light energy utilization rate and imaging quality.

[0137] The aperture of the aperture stop is controlled between 3.3 mm and 3.6 mm. This aperture range not only ensures sufficient light enters the AR lens module, but also helps to suppress unnecessary stray light, achieving the best imaging effect.

[0138] The aperture design of the aperture stop helps to achieve efficient coupling with the subsequent optical waveguide device, reducing the loss of light during the coupling process, thereby improving the optical efficiency and image quality of the entire AR lens module.

[0139] In some examples of this application, the total optical length L of the AR lens module is 5.6 mm. The maximum effective aperture of the AR lens module is 3.4 mm.

[0140] The total optical length is the sum of all lenses and air gaps in an AR lens module, and it directly determines the physical length of the AR lens module. The AR lens module provided in this application embodiment has a total optical length of 5.6mm. This data indicates that the AR lens module is designed to be relatively compact, which helps to reduce the overall size and weight of AR optical display devices and improve wearing comfort.

[0141] The maximum effective aperture typically refers to the diameter of the largest lens or the aperture stop in a lens module, determining the maximum amount of light the lens module can receive and transmit. The AR lens module provided in this application has a maximum effective aperture of 3.4mm, ensuring sufficient light enters the AR lens module while avoiding stray light interference and increased size due to an excessively large aperture. This aperture size also needs to be matched with other optical components in the AR optical display device (such as waveguide devices and display chips) to ensure the overall light transmission efficiency and imaging quality of the AR lens module.

[0142] The AR lens module design in this example achieves a compact optical structure, excellent optical performance, high light energy utilization, and easy integration with other components by precisely controlling the total optical length and maximum effective aperture. These technical effects collectively enhance the overall performance and user experience of the AR device.

[0143] In a specific example, see Figure 2 The first lens 1 to the fifth lens 5 in the AR lens module are aspherical lenses, and their optical parameters are shown in Table 1 and Table 2 below.

[0144] Table 1

[0145]

[0146]

[0147] Table 2 (Aspherical parameters of five lenses)

[0148]

[0149] The main parameters of the AR lens module provided in this application embodiment are as follows:

[0150] Effective focal length: 6.01mm;

[0151] Field of view: 13°±1°;

[0152] Relative aperture: 1 / 1.805;

[0153] Pixel size: 4μm;

[0154] Operating wavelength: 515-540nm.

[0155] The optical performance of the AR lens module provided in this application embodiment is described in [reference]. Figure 3 and Figure 4 :

[0156] Figure 3 For distortion diagrams of the AR lens module, see [link / reference]. Figure 3 The AR lens module provided in this embodiment 1 has an absolute distortion value of less than 10%, which means that the distortion generated during the imaging process of the AR lens module is small and can fully meet the user's imaging requirements for AR optical display devices.

[0157] Figure 4 For the modulation transfer function diagram of the AR lens module, see [link / reference]. Figure 4 The MTF of the AR lens module provided in this embodiment 1 is >0.65 at 125lp / mm, indicating that the AR lens module produces clear images.

[0158] According to another embodiment of this application, an optical display device is provided, comprising:

[0159] As described above, the AR lens module; and

[0160] The aperture of the aperture stop of the AR lens module is matched with the entrance pupil diameter of the optical waveguide device.

[0161] The AR lens module of this application is described in detail below through Examples 1 to 4.

[0162] Example 1

[0163] The AR lens module provided in Embodiment 1 is described in [reference]. Figure 5 It includes a lens group and a display chip 6 arranged along the same optical axis; the lens group is composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 arranged in sequence, and the fifth lens 5 is arranged adjacent to the display chip 6;

[0164] The first lens 1 is a biconvex lens, the first lens 1 to the fourth lens 4 are all plastic aspherical mirrors, and the fifth lens 5 is a glass aspherical mirror; the first lens 1 to the fifth lens 5 are all bent towards the air gap between the third lens 3 and the fourth lens 4;

[0165] The CRA of the AR lens module is 14°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0166] The AR lens module includes an aperture stop, which is located on the side of the first lens 1 opposite to the second lens 2; the air gap between the aperture stop and the first lens 1 is ≤0.3mm;

[0167] The aperture of the aperture is 3.3mm to 3.6mm.

[0168] The total optical length L of the AR lens module is 5.6mm, and the maximum effective aperture of the AR lens module is 3.4mm.

[0169] In the AR lens module provided in this embodiment 1, the optical parameters of the first lens 1 to the fifth lens are shown in Tables 3 and 4 below.

[0170] Table 3

[0171]

[0172] Table 4 (Aspherical parameters of five lenses)

[0173]

[0174]

[0175] For the optical performance of the AR lens module provided in Embodiment 1 of this application, please refer to... Figure 6 :

[0176] Figure 6 For the modulation transfer function diagram of the AR lens module, see [link / reference]. Figure 6 The MTF of the AR lens module provided in this embodiment 2 is >0.4 at 125lp / mm, indicating that the AR lens module produces clear images.

[0177] Example 2

[0178] The AR lens module provided in this embodiment 2, see [link / reference]. Figure 7 It includes a lens group and a display chip 6 arranged along the same optical axis; the lens group is composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 arranged in sequence, and the fifth lens 5 is arranged adjacent to the display chip 6;

[0179] The first lens 1 is a biconvex lens, and the first lens 1 to the fourth lens 4 are all plastic aspherical mirrors, and the fifth lens 5 is a glass aspherical mirror; the first lens 1 to the fifth lens 5 are all bent towards the air gap between the third lens 3 and the fourth lens 4;

[0180] The CRA of the AR lens module is 14°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0181] The AR lens module includes an aperture stop, which is located on the side of the first lens 1 opposite to the second lens 2; the air gap between the aperture stop and the first lens 1 is ≤0.3mm;

[0182] The aperture of the aperture is 3.3mm to 3.6mm.

[0183] The total optical length L of the AR lens module is 5.6mm, and the maximum effective aperture of the AR lens module is 3.4mm.

[0184] In the AR lens module provided in this embodiment 2, the optical parameters of the first lens 1 to the fifth lens are shown in Tables 5 and 6 below.

[0185] Table 5

[0186]

[0187] Table 6 (Aspherical parameters of five lenses)

[0188]

[0189]

[0190] For the optical performance of the AR lens module provided in Embodiment 2 of this application, please refer to... Figure 8 :

[0191] Figure 8 For the modulation transfer function diagram of the AR lens module, see [link / reference]. Figure 8 The MTF of the AR lens module provided in this embodiment 2 is >0.45 at 125lp / mm, indicating that the AR lens module produces clear images.

[0192] Example 3

[0193] The AR lens module provided in this embodiment 3 is described in [reference]. Figure 9 It includes a lens group and a display chip 6 arranged along the same optical axis; the lens group is composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 arranged in sequence, and the fifth lens 5 is arranged adjacent to the display chip 6;

[0194] The first lens 1 is a biconvex lens, and the first lens 1 to the fourth lens 4 are all plastic aspherical mirrors, and the fifth lens 5 is a glass aspherical mirror; the first lens 1 to the fifth lens 5 are all bent towards the air gap between the third lens 3 and the fourth lens 4;

[0195] The CRA of the AR lens module is 14°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0196] The AR lens module includes an aperture stop, which is located on the side of the first lens 1 opposite to the second lens 2; the air gap between the aperture stop and the first lens 1 is ≤0.3mm;

[0197] The aperture of the aperture is 3.3mm to 3.6mm.

[0198] The total optical length L of the AR lens module is 5.6mm, and the maximum effective aperture of the AR lens module is 3.4mm.

[0199] In the AR lens module provided in this embodiment 3, the optical parameters of the first lens 1 to the fifth lens are shown in Tables 7 and 8 below.

[0200] Table 7

[0201]

[0202]

[0203] Table 8 (Aspherical parameters of five lenses)

[0204]

[0205]

[0206] For the optical performance of the AR lens module provided in Embodiment 3 of this application, please refer to... Figure 10 :

[0207] Figure 10 For the modulation transfer function diagram of the AR lens module, see [link / reference]. Figure 10 The MTF of the AR lens module provided in this embodiment 3 is >0.5 at 125lp / mm, indicating that the AR lens module produces clear images.

[0208] Example 4

[0209] The AR lens module provided in Example 4 is described in [reference]. Figure 11 It includes a lens group and a display chip 6 arranged along the same optical axis; the lens group is composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 arranged in sequence, and the fifth lens 5 is arranged adjacent to the display chip 6;

[0210] The first lens 1 is a biconvex lens, and the first lens 1 to the fourth lens 4 are all plastic aspherical mirrors, and the fifth lens 5 is a glass aspherical mirror; the first lens 1 to the fifth lens 5 are all bent towards the air gap between the third lens 3 and the fourth lens 4;

[0211] The CRA of the AR lens module is 14°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0212] The AR lens module includes an aperture stop, which is located on the side of the first lens 1 opposite to the second lens 2; the air gap between the aperture stop and the first lens 1 is ≤0.3mm;

[0213] The aperture of the aperture is 3.3mm to 3.6mm.

[0214] The total optical length L of the AR lens module is 5.6mm, and the maximum effective aperture of the AR lens module is 3.4mm.

[0215] In the AR lens module provided in this embodiment 4, the optical parameters of the first lens 1 to the fifth lens are shown in Tables 9 and 10 below.

[0216] Table 9

[0217]

[0218]

[0219] Table 10 (Aspherical parameters of five lenses)

[0220]

[0221] For the optical performance of the AR lens module provided in Embodiment 4 of this application, please refer to... Figure 12 :

[0222] Figure 12 For the modulation transfer function diagram of the AR lens module, see [link / reference]. Figure 12 The MTF of the AR lens module provided in this embodiment 4 is >0.5 at 125lp / mm, indicating that the AR lens module produces clear images.

[0223] 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.

[0224] 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 AR lens module for a green optical engine, characterized in that, It includes a lens group and a display chip (6) arranged along the same optical axis; the lens group consists of a first lens (1), a second lens (2), a third lens (3), a fourth lens (4) and a fifth lens (5) arranged in sequence, and the fifth lens (5) is adjacent to the display chip (6); The first lens (1) to the fourth lens (4) are plastic aspherical mirrors, and the fifth lens (5) is a glass aspherical mirror; Among them, the effective focal length F1 of the first lens (1) is 3.6 mm to 4.3 mm; The CRA of the AR lens module is 14°, and the CRA is the included angle between the marginal field principal ray and the optical axis of the display chip (6); The AR lens module satisfies: 8.4 < (F1 + F2 + F5) / L < 14; where F1 is the effective focal length of the first lens (1), F2 is the effective focal length of the second lens (2), F5 is the effective focal length of the fifth lens (5), and L is the total optical length of the AR lens module.

2. The AR lens module according to claim 1, characterized in that, The first lens (1) to the fifth lens (5) are all bent towards the air gap between the third lens (3) and the fourth lens (4).

3. The AR lens module according to claim 1, characterized in that, The AR lens module satisfies: -9.8 < (F3 + F4) / L < -5.5; where F3 is the effective focal length of the third lens (3), F4 is the effective focal length of the fourth lens (4), and L is the total optical length of the AR lens module.

4. The AR lens module according to claim 1, characterized in that, The effective focal length F2 of the second lens (2) is 9.1 mm to 10.2 mm; The effective focal length F5 of the fifth lens (5) is 36 mm to 54 mm.

5. The AR lens module according to claim 3, characterized in that, The effective focal length F3 of the third lens (3) is -3.1 mm to -2.3 mm; The effective focal length F4 of the fourth lens (4) is -48 mm to -30 mm.

6. The AR lens module according to claim 1, characterized in that, The AR lens module satisfies: 2.1 < (A3 + A4) / (A1 + A2 + A5) < 2.8; where A1 is the air gap between the first lens (1) and the second lens (2), A2 is the air gap between the second lens (2) and the third lens (3), A3 is the air gap between the third lens (3) and the fourth lens (4), A4 is the air gap between the fourth lens (4) and the fifth lens (5), and A5 is the air gap between the fifth lens (5) and the display chip (6).

7. The AR lens module according to claim 6, characterized in that, The AR lens module satisfies: 6.1 < L / (A1 + A2 + A5) < 12.2; where L is the total optical length of the AR lens module.

8. The AR lens module according to claim 7, characterized in that, The AR lens module satisfies: 3.3 < L / (A3 + A4) < 4.

2.

9. The AR lens module according to any one of claims 1-8, characterized in that, The AR lens module includes an aperture stop, and the aperture stop is located on the side of the first lens (1)背离 the second lens (2); The air gap between the aperture stop and the first lens (1) ≤ 0.3 mm; The aperture diameter of the aperture stop is 3.3 mm to 3.6 mm.

10. The AR lens module according to claim 9, characterized in that, The total optical length L of the AR lens module is 5.6 mm; The maximum effective aperture of the AR lens module is 3.4 mm.

11. An optical display device, characterized in that, It includes: AR lens module as described in any one of claims 1-10; and The aperture of the aperture stop of the AR lens module is matched with the entrance pupil diameter of the optical waveguide device.

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