AR lens module and optical display device

Abstract

The embodiment of the invention provides an AR lens module and optical display equipment. Wherein the AR lens module comprises a lens group and a display chip which are arranged along the same optical axis; the lens group is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged, and the fifth lens is adjacent to the display chip; the first lens, the second lens, the third lens and the fourth lens are plastic aspherical mirrors, and the fifth lens is a glass aspherical mirror. Wherein the first lens is a plano-convex lens, and the effective focal length F1 of the first lens ranges from 3.6 mm to 4.3 mm.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical display technology. More specifically, the embodiments of the present application relate to an AR lens module and an optical display device. Background Art

[0002] In the field of augmented reality (AR) technology, the size and weight of the device have a significant impact on the user's wearing comfort. At present, the size and weight of AR devices are mainly limited by the complex optical module design inside them. For example, traditional AR lens modules usually contain complex lighting optical paths, which not only increases the overall size of the device, but also leads to a heavier weight, thereby reducing the user's wearing experience. In addition, in the process of pursuing miniaturization, existing AR lens modules often find it difficult to take into account imaging quality, resulting in frequent problems such as image distortion and astigmatism, which affects 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 needs to be urgently 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, the present application provides an AR lens module. The AR lens module is used for a green light machine, and includes a lens group and a display chip arranged along the same optical axis; the lens group is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence, and the fifth lens is arranged adjacent to the display chip;

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

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

[0008] Optionally, the first lens to the fifth lens are all bent toward the air space 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 main light 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 a diaphragm, and the diaphragm is located on the side of the first lens away from the second lens;

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

[0021] The aperture of the diaphragm 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 3.4 mm.

[0024] In a second aspect, the present application provides an optical display device. The optical display device comprises:

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

[0026] Optical waveguide device, the aperture of the diaphragm of the AR lens module matches the entrance pupil diameter of the optical waveguide device.

[0027] The beneficial effects of this application are:

[0028] The AR lens module provided in the embodiment of the present application replaces some glass lenses with plastic lenses, which not only reduces the weight of the AR lens module but also reduces the production cost. In the present application, the first lens far away from the display chip is designed to have positive focal power and its positive focal power is relatively large in terms of its effective focal length, which allows the first lens to converge light within a shorter focal length, thereby helping to reduce the volume 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 light angle and control the aperture of the AR lens module. The purpose of the aspherical design is to significantly reduce the spherical aberration phenomenon that may be caused by the large aperture, thereby significantly improving the imaging quality.

[0029] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

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

[0032] Figure 2 An optical path diagram of an AR lens module provided in an embodiment of the present 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 AR lens module provided;

[0035] Figure 5 The second structural diagram of the AR lens module provided in the embodiment of the present application;

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

[0037] Figure 7 The third structural diagram of the AR lens module provided in the embodiment of the present application;

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

[0039] Fig. 9 The fourth structural diagram of the AR lens module provided in the embodiment of the present application;

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

[0041] Fig.11 The fifth structural diagram of the AR lens module provided in the embodiment of the present application;

[0042] Fig.12 for Fig.11 Modulation transfer function diagram of the AR lens module provided.

[0043] Description of reference numerals:

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

[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 of components and steps, numerical expressions and numerical values ​​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 in nature and is in no way intended to limit the present application, its application, or uses.

[0047] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0048] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0049] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0050] The AR lens module and optical display device provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0051] According to an embodiment of the present application, an AR lens module is provided. Figure 1 The AR lens module is used for a green light machine, and 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; the first lens 1 to the fourth lens 4 are plastic aspherical lenses, and the fifth lens 5 is a glass aspherical lens; wherein the first lens 1 is a plano-convex lens, and the effective focal length F1 of the first lens 1 is 3.6 mm to 4.3 mm.

[0052] The AR lens module provided in the embodiment of the present application is an extremely miniaturized AR lens module for a single green AR lens. The AR lens module in the embodiment of the present application achieves miniaturization, weight reduction, and guaranteed imaging quality.

[0053] The AR lens module provided in the embodiment of the present application is an extremely miniaturized AR lens design for a single green AR lens, which can be specifically used to transmit monochromatic light such as green light. In AR applications, image information is usually superimposed on the view of the real world. Green, as a color widely present in nature, is of great significance for presenting reality and enhancing visual effects. Therefore, optimizing for green light can enhance the realism and user experience of AR display.

[0054] The AR lens module provided in the embodiment of the present application is shown in Figure 1 , which is mainly composed 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 in sequence along the same optical axis. This arrangement is conducive to the orderly transmission of light and the control of imaging quality.

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

[0056] Plastic lenses are lighter than glass lenses. In AR optical display devices (such as AR smart glasses, etc.), reducing the weight of the AR lens module is crucial to improving user wearing comfort. In this application, four of the five lenses (the first lens 1 to the fourth lens 4) are designed to be plastic, which can significantly reduce the weight of the entire AR lens module. In addition, plastic lenses are not only light in weight, but also relatively easy to process into complex aspheric surfaces, which helps to reduce the volume of the AR lens module, which helps to make the entire AR optical display device more compact.

[0057] In the present application, the five lenses in the lens group all adopt an aspherical design, 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 transmittance and thermal stability. Based on this, in the present application, by designing the fifth lens 5 as a glass aspherical lens, the influence of the heat generated by the display chip 6 during operation on the lens group can be avoided.

[0059] In the present application, the fifth lens 5 close to 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, and the display chip 6 may generate a certain amount of heat when working. Glass lenses can better withstand such heat due to their high thermal stability without causing obvious deformation or degradation of optical performance. This helps to maintain the stability and consistency of the module.

[0060] The image quality produced by the display chip 6 is directly affected by the lens group. Designing the fifth lens as a glass aspherical lens can more effectively control the transmission and focusing of light and reduce the scattering and distortion of light when passing through the lens. This is crucial to improving the resolution, contrast and color accuracy of the AR lens module.

[0061] Therefore, the lens assembly of the present application can ensure that key optical performance is not affected while maintaining overall lightweight, thereby further improving imaging quality.

[0062] In the AR lens module provided in the embodiment of the present application, the first lens 1 is designed to be a plano-convex lens.

[0063] Specifically, see Figure 1, the first lens 1 is located on the side close to the aperture. The first lens 1, as a plano-convex lens, helps to narrow the angle of light and control the aperture of the AR lens module, thereby helping to reduce spherical aberration and improve imaging quality. For example, the maximum effective aperture of the AR lens module of the present application is 3.4 mm, which is much lower than the existing specifications of the AR lens system.

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

[0065] In optical design, the shorter the effective focal length, the greater the focal power of the lens. The focal power is the inverse of the focal length of the lens, represented by Φ, that is, Φ=1 / F. In the present 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 focal power Φ of the first lens 1 is between about 0.23 (1 / 4.3) and about 0.28 (1 / 3.6), and this focal power range is relatively large.

[0066] A larger optical power means that the first lens 1 has a stronger light converging ability, which helps to form a clear image within 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 lengths of the lenses at different positions, it is possible to ensure that the light can be correctly focused while maintaining the compactness of the AR lens module.

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

[0069] In the lens group of the present application, the optical power of the first lens 1 is relatively large, which is mainly reflected in its shorter effective focal length range (3.6mm~4.3mm). The larger optical power enables the first lens 1 to have a stronger light convergence ability, which helps to reduce the light angle, control the AR lens module aperture, reduce spherical aberration, and improve imaging quality. At the same time, this design also helps to optimize the focal length distribution and maintain the compactness of the AR lens module, meeting the strict requirements of AR optical display devices on volume and weight.

[0070] In summary, the AR lens module provided in the embodiment of the present application replaces some glass lenses with plastic lenses, which not only reduces the weight of the AR lens module, but also reduces the production cost; in the present application, the first lens 1 away from the display chip 6 is designed to have positive focal power and its positive focal power is relatively large from the perspective of its effective focal length, which allows the first lens 1 to achieve light convergence within a shorter focal length, thereby helping to reduce the volume of the AR lens module and make it more compact; the surface of the first lens 1 is plano-convex and aspherical, and the plano-convex design is intended to effectively reduce the light angle and control the aperture of the AR lens module, and the purpose of the aspherical design is to significantly reduce the spherical aberration phenomenon that may be caused by the large aperture, thereby significantly improving the imaging quality.

[0071] In some examples of this application, see Figure 1 , the first lens 1 to the fifth lens 5 are all bent toward the air space between the third lens 3 and the fourth lens 4.

[0072] In this example of the present application, the AR lens module exhibits a similar symmetrical architecture design, in which the five lenses are all 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 Figure 1 This design reduces distortion, which is the unnatural curvature of straight lines in an image, and astigmatism, which is the inability of light to focus precisely on a single point, resulting in a loss of image clarity.

[0073] In this example of the present application, the first lens 1 to the fifth lens 5 are all bent toward the air space between the third lens 3 and the fourth lens 4. This design can optimize the optical path and ensure that the light can pass through the AR lens module according to the predetermined path.

[0074] In addition, the symmetrical design of the optical architecture provided by the present application not only maintains excellent optical performance, but also promotes 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, the present application achieves a reduction in the overall size of the AR lens module without sacrificing any optical indicators. This feature is extremely valuable for AR optical display devices, etc., where space resources are precious.

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

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

[0077] The size of CRA affects the volume of the AR lens module. A larger CRA means that the incident angle 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 reducing the volume of the AR lens module.

[0078] The AR lens module of the embodiment of the present application has a CRA of 14°, that is, the angle between the edge field of view chief ray and the optical axis of the display chip 6 is 14°. This angle can not only ensure a sufficient field of view angle (such as 13°±1°) to meet the visual needs of users, but also minimize the longitudinal size of the AR lens module, which helps to make the entire AR optical display device more compact and convenient for users to wear and use.

[0079] The size of 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 the light emitted by the display chip 6 that can eventually reach the user's eyes and be effectively utilized.

[0080] In the present application, by optimizing the curvature, thickness, material, etc. of the lens, light loss is reduced and light energy utilization is improved while maintaining a large CRA.

[0081] In addition, a larger CRA can also help reduce the impact of stray light. Stray light refers to light that does not propagate along the intended path and interferes 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 comprehensive performance of the AR lens module to a certain extent. For example, it helps to reduce the aberrations (such as distortion, astigmatism, etc.) of the AR lens module and improve the clarity of the image.

[0083] In some examples of the present application, 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.

[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 also have a design of positive optical power lenses. In other words, 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 the optical power Φ2=1 / F2, so the range of Φ2 is about 0.098-0.110.

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

[0087] The lens with positive focal length has the function of converging light, which helps to focus the light from the display chip 6 onto a predetermined imaging plane. In this example of the present application, the positive focal length design of the second lens 2 and the fifth lens 5 ensures that the light can be effectively converged when passing through these lenses, thereby enhancing the imaging capability of the entire AR lens module. In addition, the longer effective focal length (especially the fifth lens 5) helps to control the diffusion of light and further improve the clarity and resolution of imaging.

[0088] In some examples of the present application, 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.

[0089] The AR lens module provided in the embodiment of the present application 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 -3.1 mm and -2.3 mm, and the focal power Φ3=1 / F3, so the range of Φ3 is about -0.323 to -0.435 (negative value).

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

[0092] A lens with negative optical power has the function of diverging light, which can be used to correct aberrations, adjust the optical path or achieve a specific imaging effect. In this example of the present application, the negative optical power design of the third lens 3 and the fourth lens 4 effectively corrects the aberrations introduced by other lenses (especially positive optical power lenses) and helps adjust the optical path to ensure that the 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 volume of the AR lens module and achieve a more compact design.

[0093] In an example of the present 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 3.6 mm to 4.3 mm, the effective focal length F2 of the second lens 2 is 9.1 mm to 10.2 mm, 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, and the effective focal length F5 of the fifth lens 5 is 36 mm to 54 mm.

[0094] This application achieves control over the light propagation path through a combination of five specially designed lenses with effective focal lengths (positive, positive, negative, negative, positive in sequence), which not only enhances the imaging capability of the AR lens module, but also achieves miniaturization of its volume. The convergence effect of the positive focal lens combined with the divergence effect of the negative focal lens jointly optimizes 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 precision AR lens module, which provides high-quality imaging while maintaining compactness. The focal length design of each lens in the lens group is carefully designed in this application to ensure that they can work together to correct various aberrations and improve the overall performance of the AR lens module.

[0096] In some examples of the present application, the AR lens module satisfies: 8.4<(F1+F2+F5) / L<14; ​​wherein 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 the present 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 and is 5.6 mm, 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, ensuring the reasonable distribution of the optical power in the AR lens module. This avoids a single lens from bearing too much optical power, thereby reducing the impact of manufacturing errors on imaging quality.

[0099] Evenly distributing the focal length can also reduce the complexity of AR lens module design. In optical design, there is no need to rely too much on one or several lenses to correct aberrations, but the synergy of multiple lenses can achieve better imaging effects.

[0100] When (F1+F2+F5) / L is greater than 8.4, L, i.e., the total optical length of the AR lens module, has a certain limiting effect. If L is too large, in order 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 the limitations of materials or design. Therefore, this condition helps to control the size of the module within a reasonable range. Smaller module size is not only conducive to improving wearing comfort, but also helps to achieve more compact AR devices.

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

[0102] In summary, when the AR lens module meets the condition 8.4<(F1+F2+F5) / L<14, especially when F1, F2, and F5 are all positive focal lengths, this condition helps to achieve uniform distribution of focal lengths, reduce tolerance sensitivity, control the size of the entire AR lens module, and improve imaging quality. These benefits work together in the design and optimization process of the AR lens module, helping to design an AR lens module with excellent performance, low cost, and easy manufacturing.

[0103] In some examples of the present application, the AR lens module satisfies: -9.8<(F3+F4) / L<-5.5; wherein 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 the embodiment of the present application not only satisfies the condition 8.4<(F1+F2+F5) / L<14 mentioned in the above example, but also satisfies the condition in this example of the present 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 focal lengths of the two lenses are both negative. This example of the present application reasonably adjusts the distribution of negative optical focal lengths in the AR lens module.

[0105] According to the conditions proposed in this example of the present 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 the reasonable distribution of negative focal power in the entire AR lens module. By setting the upper and lower limits of the ratio, the negative focal power distribution of the two lenses can be optimized while maintaining the compact structure of the entire AR lens module, avoiding design difficulties caused by too small or too large focal length of a single lens.

[0106] See also Figure 1 The third lens 3 and the fourth lens 4 are basically located in the middle of the entire lens group. The reasonable optical power distribution of the 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 of the present application avoid extreme optical power distribution, which helps to reduce the impact of manufacturing errors on imaging quality and improve the stability of the module. At the same time, reasonable optical power distribution also helps to reduce the manufacturing difficulty of the lens and improve production efficiency.

[0108] In this application, by reasonably controlling the combination of negative optical power lenses, the structure of the AR lens module can be further optimized without sacrificing imaging quality. For example, a more compact optical structure helps reduce the size and weight of the AR optical machine and even the AR optical display device, and improves wearing comfort.

[0109] In the AR lens module of this application, the lenses with positive and negative focal powers need to cooperate with each other to achieve high-quality imaging. When the ratio of the negative focal 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 focal power in the module. This balance is crucial for reducing aberrations, improving resolution and other imaging quality indicators.

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

[0111] In an example of the present application, the AR lens module satisfies: 8.4<(F1+F2+F5) / L<14, and -9.8<(F3+F4) / L<-5.5; wherein 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 the two ratio conditions in the above example are met at the same time, it indicates that the AR lens module has achieved structural optimization and balance, which not only ensures sufficient positive focal length to converge light, but also disperses light through reasonable negative focal length, so that the AR lens module as a whole remains compact. When these two ratio conditions are met at the same time, the AR lens module can also provide clear, distortion-free images in a wider field of view. In addition, these two ratio conditions also help to improve the manufacturability of the AR lens module. By precisely controlling the parameters and combination of each lens, the tolerance requirements in the manufacturing process can be reduced, and the yield and consistency of the product can be improved.

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

[0114] In some examples of the present application, the AR lens module satisfies: 2.1<(A3+A4) / (A1+A2+A5)<2.8; wherein 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 present application is: 2.1<(A3+A4) / (A1+A2+A5)<2.8, which expresses the proportional relationship of the air spacing between adjacent optical elements in the AR lens module.

[0116] Wherein, A3 and A4 are respectively the air intervals between the third lens 3 and the fourth lens 4, and between the fourth lens 4 and the fifth lens 5. A1, A2 and A5 are respectively the air intervals 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. The inequality in this example of the present application requires that the ratio of (A3+A4) to (A1+A2+A5) is between 2.1 and 2.8.

[0117] By controlling the ratio of the above-mentioned air intervals (i.e., A1, A2, A3, A4, A5), the aberration correction of the AR lens module can be optimized, especially reducing high-order aberrations such as coma and field curvature. The appropriate air interval ratio helps to improve the imaging quality of the AR lens module, especially in the edge field of view. And this design also helps to control the overall length of the AR lens module and maintain its compactness.

[0118] When the ratio of (A3 + A4) to (A1 + A2 + A5) is greater than 2.1, the AR lens module can be prevented from 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 a light path, 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 enough back focal space while maintaining compactness, which is convenient for coupling with subsequent optical elements such as optical waveguides. In addition, an appropriate ratio also helps to improve the manufacturing tolerance of the AR lens module, reducing the 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 enough back focal space. This is crucial for coupling with subsequent optical elements such as optical waveguide devices, which helps to achieve clear and distortion-free imaging. This ratio relationship helps to reduce the loss of light during propagation and improve the light energy utilization rate. This is particularly important for augmented reality devices, because high light energy utilization rate 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 of 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. The AR lens module can 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] When the inequality condition is satisfied, 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), the dimensions and positional relationships of the respective optical components can be more easily controlled 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 a diaphragm, and the diaphragm is located on the side of the first lens 1 facing away from the second lens 2; the air gap between the diaphragm and the first lens 1 ≤ 0.3 mm; the aperture of the diaphragm is 3.3 mm to 3.6 mm.

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

[0136] The air gap between the diaphragm and the first lens 1 ≤ 0.3 mm. 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 diaphragm is controlled between 3.3 mm and 3.6 mm. This aperture range not only ensures that 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 diaphragm helps to achieve efficient coupling with the subsequent 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 the present application, the total optical length L of the AR lens module is 5.6 mm, and 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 spaces in the AR lens module, which directly determines the physical length of the AR lens module. The AR lens module provided in the embodiment of the present application has a total optical length of 5.6 mm, which indicates that the AR lens module is designed to be relatively compact, which helps to reduce the overall volume and weight of the AR optical display device and improve wearing comfort.

[0141] The maximum effective aperture usually refers to the diameter of the largest lens or the aperture of the diaphragm in the lens module, which determines the maximum amount of light that the lens module can receive and transmit. The AR lens module provided in the embodiment of the present application has a maximum effective aperture of 3.4mm, which not only ensures that enough light enters the AR lens module, but also avoids stray light interference and volume increase caused by an excessively large aperture. This aperture size also needs to match other optical components in the AR optical display device (such as optical waveguide devices, display chips, etc.) to ensure the light transmission efficiency and imaging quality of the entire AR lens module.

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

[0143] For 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 respectively.

[0144] Table 1

[0145]

[0146]

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

[0148]

[0149] The main parameters of the AR lens module provided in the embodiment of the present application 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] Working band: 515-540nm.

[0155] For the optical performance of the AR lens module provided in the embodiments of the present application, see Figure 3 and Figure 4 :

[0156] Figure 3 This is the distortion diagram of the AR lens module, see 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 the AR optical display device.

[0157] Figure 4 This is the modulation transfer function diagram of the AR lens module, see 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 has clear imaging.

[0158] According to another embodiment of the present application, an optical display device is provided, including:

[0159] The AR lens module as described above; and

[0160] Optical waveguide device, the aperture of the diaphragm of the AR lens module matches the entrance pupil diameter of the optical waveguide device.

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

[0162] Example 1

[0163] The AR lens module provided in this embodiment 1 is shown in FIG. Figure 5 , comprising 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 plano-convex lens, the first lens 1 to the fourth lens 4 are all plastic aspherical lenses, and the fifth lens 5 is a glass aspherical lens; the first lens 1 to the fifth lens 5 are all bent toward the air space 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 main ray of the edge field of view and the optical axis of the display chip;

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

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

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

[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 Table 3 and Table 4 below.

[0170] Table 3

[0171]

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

[0173]

[0174]

[0175] For the optical performance of the AR lens module provided in Example 1 of the present application, see Figure 6 :

[0176] Figure 6 This is the modulation transfer function diagram of the AR lens module, see 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 has clear imaging.

[0177] Example 2

[0178] The AR lens module provided in this embodiment 2 is shown in FIG. Figure 7 , comprising 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 plano-convex lens, and the first lens 1 to the fourth lens 4 are all plastic aspherical lenses, and the fifth lens 5 is a glass aspherical lens; the first lens 1 to the fifth lens 5 are all bent toward the air space 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 main ray of the edge field of view and the optical axis of the display chip;

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

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

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

[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 Table 5 and Table 6 below.

[0185] Table 5

[0186]

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

[0188]

[0189]

[0190] For the optical performance of the AR lens module provided in Example 2 of the present application, see Figure 8 :

[0191] Figure 8 This is the modulation transfer function diagram of the AR lens module, see 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 has clear imaging.

[0192] Example 3

[0193] The AR lens module provided in this embodiment 3 is shown in FIG. Fig. 9 , comprising 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 plano-convex lens, and the first lens 1 to the fourth lens 4 are all plastic aspherical lenses, and the fifth lens 5 is a glass aspherical lens; the first lens 1 to the fifth lens 5 are all bent toward the air space 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 main ray of the edge field of view and the optical axis of the display chip;

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

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

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

[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 Table 7 and Table 8 below.

[0200] Table 7

[0201]

[0202]

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

[0204]

[0205]

[0206] For the optical performance of the AR lens module provided in Example 3 of the present application, see Fig.10 :

[0207] Fig.10 This is the modulation transfer function diagram of the AR lens module, see Fig.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 has clear imaging.

[0208] Example 4

[0209] The AR lens module provided in this embodiment 4 is shown in FIG. Fig.11 , comprising 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 plano-convex lens, and the first lens 1 to the fourth lens 4 are all plastic aspherical lenses, and the fifth lens 5 is a glass aspherical lens; the first lens 1 to the fifth lens 5 are all bent toward the air space 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 main ray of the edge field of view and the optical axis of the display chip;

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

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

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

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

[0216] Table 9

[0217]

[0218]

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

[0220]

[0221] For the optical performance of the AR lens module provided in Example 4 of the present application, see Fig.12 :

[0222] Fig.12 This is the modulation transfer function diagram of the AR lens module, see Fig.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 has clear imaging.

[0223] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0224] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An AR lens module for a green light machine, characterized in that: 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 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. Among them, the first lens (1) is a plano-convex lens, and the effective focal length F1 of the first lens (1) is 3.6 mm to 4.3 mm.

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 CRA of the AR lens module is 14°, and CRA is the angle between the chief ray of the edge field of view and the optical axis of the display chip (6).

4. The AR lens module according to claim 1, characterized in that: 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.

5. 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.

6. The AR lens module according to claim 4, 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.

7. The AR lens module according to claim 5, 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.

8. 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).

9. The AR lens module according to claim 8, 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.

10. The AR lens module according to claim 9, characterized in that: The AR lens module satisfies: 3.3 < L / (A3 + A4) < 4.

2.

11. The AR lens module according to any one of claims 1 to 10, characterized in that: The AR lens module includes a diaphragm, and the diaphragm is located on the side of the first lens (1)背离 the second lens (2). The air gap between the diaphragm and the first lens (1) ≤ 0.3 mm. The aperture of the diaphragm is 3.3 mm to 3.6 mm.

12. The AR lens module according to claim 11, 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.

13. An optical display device, characterized in that: include: The AR lens module as claimed in any one of claims 1 to 12; and Optical waveguide device, the aperture of the diaphragm of the AR lens module matches the entrance pupil diameter of the optical waveguide device.

Images