Ar lens module and optical display device

Abstract

Embodiments of the present application provide an AR lens module and an optical display device; wherein the AR lens module comprises 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, the fifth lens is arranged adjacent to the display chip; the first lens and the fifth lens are meniscus aspheric lenses, and the first lens and the fifth lens are both curved towards the air gap between the third lens and the fourth lens; the CRA of the AR lens module is 15°, and the CRA is the included angle between the edge field chief ray and the optical axis of the display chip.

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 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, and the fifth lens is arranged adjacent to the display chip;

[0006] The first lens and the fifth lens are meniscus aspherical lenses, and both the first lens and the fifth lens are bent toward the air gap between the third lens and the fourth lens;

[0007] The CRA of the AR lens module is 15°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0008] Optionally, four of the lenses from the first lens to the fifth lens are plastic lenses.

[0009] Optionally, the second lens, the third lens, and the fourth lens are all bent toward the air gap between the third lens and the fourth lens.

[0010] Optionally, the effective focal length F1 of the first lens is 6.9mm to 7.6mm;

[0011] The effective focal length F2 of the second lens is 4.7mm to 5.4mm;

[0012] The effective focal length F3 of the third lens is -4 mm to -3.6 mm.

[0013] Optionally, the effective focal length F4 of the fourth lens is -15 mm to -11 mm;

[0014] The effective focal length F5 of the fifth lens is 9 mm to 13 mm.

[0015] Optionally, the AR lens module satisfies: 3.6 < (F1 + F2 + F5) / L < 4.8; 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.

[0016] Optionally, the AR lens module satisfies: -3.6 < (F3 + F4) / L < -2.5; 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.

[0017] Optionally, the AR lens module satisfies: 6 < (A2 + A3 + A4) / (A1 + A5) < 17; 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.

[0018] Optionally, the AR lens module satisfies: 2.3 < L / (A2 + A3 + A4) < 3.1; where L is the total optical length of the AR lens module.

[0019] Optionally, the first lens to the fourth lens are plastic aspherical lenses;

[0020] The fifth lens is a glass aspherical lens. [[ID=?]]

[0021] Optionally, the AR lens module includes an aperture stop, and the aperture stop is located on the side of the first lens facing away from the second lens;

[0022] The air gap between the aperture stop and the first lens is ≤ 0.2 mm;

[0023] The aperture diameter of the aperture stop is 3.2 mm to 3.5 mm.

[0024] Optionally, the total optical length L of the AR lens module is 5.5 mm;

[0025] The maximum effective aperture of the AR lens module is 3.3mm.

[0026] Secondly, this application provides an optical display device. The optical display device includes:

[0027] The AR lens module as described in the first aspect; and

[0028] The aperture of the aperture stop of the AR lens module is matched with the entrance pupil diameter of the optical waveguide device.

[0029] The beneficial effects of this application are as follows:

[0030] The AR lens module provided in this application achieves miniaturization and significant weight reduction while ensuring excellent image quality. Specifically, by optimizing the lens group design, the AR lens module of this application can significantly reduce the size of the AR optical engine without sacrificing image quality. Furthermore, the CRA design of the AR lens module further enhances the compactness of the module and even the AR optical engine, making the overall device lighter and greatly improving user comfort. In summary, the AR lens module of this application improves device portability while ensuring excellent visual performance, opening up new possibilities for the development and application of augmented reality technology.

[0031] 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

[0032] 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.

[0033] Figure 1 This is one of the structural schematic diagrams of the AR lens module provided in the embodiments of this application;

[0034] Figure 2 The optical path diagram of the AR lens module provided in the embodiments of this application;

[0035] Figure 3 for Figure 2 Distortion diagram of the provided AR lens module;

[0036] Figure 4 for Figure 2 The modulation transfer function diagram of the provided AR lens module;

[0037] Figure 5 This is the second schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

[0038] Figure 6for Figure 5 The modulation transfer function diagram of the provided AR lens module;

[0039] Figure 7 This is the third schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

[0040] Figure 8 for Figure 7 The modulation transfer function diagram of the provided AR lens module;

[0041] Figure 9 This is the fourth schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

[0042] Figure 10 for Figure 9 The modulation transfer function diagram of the provided AR lens module;

[0043] Figure 11 Fifth schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

[0044] Figure 12 for Figure 11 The provided modulation transfer function diagram for the AR lens module.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Display chip. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] According to one embodiment of this application, an AR lens module is provided, see [link to relevant documentation]. Figure 1 The AR lens module 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, and the fifth lens 5 is arranged adjacent to the display chip 6; the first lens 1 and the fifth lens 5 are meniscus aspherical lenses, and both the first lens 1 and the fifth lens 5 are bent towards the air gap between the third lens 3 and the fourth lens 4; the CRA of the AR lens module is 15°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip 6.

[0054] 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.

[0055] 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.

[0056] The AR lens module provided in this application embodiment is referred to... 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.

[0057] In the embodiments of this application, see Figure 1 Both the first lens 1 near the aperture and the fifth lens 5 near the display chip are designed as meniscus aspherical lenses. This design can effectively reduce the angle of light, control the aperture of the AR lens module, and reduce spherical aberration caused by the large aperture, thereby improving image quality. For example, the maximum effective aperture of the AR lens module of this application is 3.3mm, which is much lower than that of existing AR lens systems.

[0058] Specifically, in the optical architecture provided in this application, the first lens 1 and the fifth lens 5 are arranged in a symmetrical structure, see [reference needed]. Figure 1 Both curve towards the center of the entire AR lens module. This can bring at least the following two technical effects:

[0059] On one hand, the symmetrical structural layout of the first lens 1 and the fifth lens 5 helps reduce distortion and astigmatism in the AR lens module. When the lens group is arranged in a centrally symmetrical manner, light rays from different directions are more evenly affected when passing through the lens group, thereby reducing image distortion. The design of the meniscus aspherical lens helps correct spherical aberration, and when this design is applied to the aforementioned symmetrical structure, the effect of spherical aberration correction can be further enhanced. Aspherical lenses provide more precise light path control, while the symmetrical structure ensures the consistency of this control throughout the entire field of view.

[0060] On the other hand, a symmetrical structure helps to achieve a more compact optical design. By symmetrically arranging the first lens 1 and the fifth lens 5, the overall size of the module can be reduced without sacrificing optical performance. This is especially important for space-constrained applications such as AR devices.

[0061] In the AR lens module provided in this application embodiment, both the first lens 1 and the fifth lens 5 are bent toward the air gap between the third lens 3 and the fourth lens 4. This symmetrical bending design helps to reduce distortion and astigmatism, and further improves the imaging quality.

[0062] The AR lens module provided in this embodiment has a CRA of 15°, meaning the angle between the principal ray of the edge field of view and the optical axis of the display chip 6 is 15°. This CRA value design allows the AR lens module to further reduce the size of the AR optical engine while ensuring a sufficient field of view, which is beneficial to improving the wearing comfort of AR optical display devices.

[0063] In this application, by increasing the CRA, the AR lens module can achieve a larger field of view without increasing the lens length, thereby reducing the overall size of the AR lens module.

[0064] The AR lens module of this application achieves miniaturization and weight reduction, which is of great significance for improving the wearing comfort of augmented reality devices. Despite the reduced size of the AR lens module, by optimizing the lens design and selecting suitable materials, this application embodiment still ensures good image quality, meeting users' needs for a high-quality visual experience.

[0065] In summary, the AR lens module of this application achieves a balance between size, weight and image quality, providing strong support for the development of augmented reality devices.

[0066] In some examples of this application, four of the lenses from the first lens 1 to the fifth lens 5 are plastic lenses.

[0067] In the example of this application, four of the lenses from the first lens 1 to the fifth lens 5 are designed as plastic lenses, which can reduce the weight of the entire AR lens module.

[0068] Plastic lenses have a much lower density than glass lenses, so using plastic lenses can significantly reduce the weight of the entire AR lens module. For augmented reality (AR) devices, weight reduction is one of the key factors in improving wearing comfort and user experience.

[0069] Plastic materials possess good plasticity and moldability, making it possible to design more complex aspherical lenses. Aspherical lenses can provide superior optical performance, such as reduced aberrations and improved image quality. Therefore, using plastic lenses can increase the flexibility of the entire AR lens module design to meet higher performance optical requirements.

[0070] Furthermore, plastic lenses offer better impact resistance compared to glass lenses. In applications such as AR optical display devices, which are susceptible to accidental impacts or drops, using plastic lenses can reduce the risk of lens breakage and improve the durability and reliability of the device.

[0071] See some examples in this application. Figure 1 The second lens 2, the third lens 3, and the fourth lens 4 are all bent toward the air gap between the third lens 3 and the fourth lens 4.

[0072] In the example of this application, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are all bent towards the air gap between the third lens 3 and the fourth lens 4, forming a symmetrical structural layout. This layout can reduce distortion and astigmatism.

[0073] Specifically, the symmetrical layout of the lens group helps reduce distortion and astigmatism in the AR lens module. When all lenses bend towards the center of the module, the refraction path of light through the lenses is more uniform, thereby reducing image distortion caused by uneven light refraction. This is especially important for augmented reality (AR) devices, as it ensures that the image seen by the user is clear and accurate.

[0074] The symmetrical layout of the lens group provides better image quality. Because light travels a more even path through each lens, the lens group can more effectively collect and focus light, resulting in a sharper image. This is crucial for AR devices, as it directly impacts the user's visual experience.

[0075] The symmetrical layout of the lens group helps optimize the space utilization of the AR lens module. By bending all the lenses towards the center of the AR lens module, the limited space can be used more effectively to arrange the lenses and air gaps, thus achieving a more compact optical architecture design for the AR lens module. This is of great significance for reducing the size and weight of AR optical display devices.

[0076] In some examples of this application, the effective focal length F1 of the first lens 1 is 6.9mm to 7.6mm, the effective focal length F2 of the second lens 2 is 4.7mm to 5.4mm, and the effective focal length F3 of the third lens 3 is -4mm to 3.6mm.

[0077] In some examples of this application, the effective focal length F4 of the fourth lens 4 is -15mm to -11mm, and the effective focal length F5 of the fifth lens 5 is 9mm to 13mm.

[0078] In a specific example of this application, the lens group includes a first lens 1 to a fifth lens 5 arranged sequentially. The effective focal length F1 of the first lens 1 is 6.9mm to 7.6mm, the effective focal length F2 of the second lens 2 is 4.7mm to 5.4mm, the effective focal length F3 of the third lens 3 is -4mm to 3.6mm, the effective focal length F4 of the fourth lens 4 is -15mm to -11mm, and the effective focal length F5 of the fifth lens 5 is 9mm to 13mm.

[0079] Specifically, the effective focal length F1 of the first lens 1 is F1 = 6.9mm to 7.6mm. As the lens located away from the display chip 6 and close to the aperture stop, the focal length design of the first lens 1 plays a crucial role in controlling the angle of light incidence and the overall optical length of the module. Setting the effective focal length within the range of 6.9mm to 7.6mm helps ensure sufficient light collection capability while maintaining the compactness of the AR lens module. Furthermore, this focal length range also helps reduce spherical aberration and chromatic aberration in the AR lens module, improving image quality. This focal length range also helps optimize the exit pupil diameter of the module, improving light collection efficiency.

[0080] The effective focal length F2 of the second lens 2 is F2 = 4.7mm to 5.4mm. Setting the effective focal length of the second lens 2 within a shorter range helps to further correct aberrations in the AR lens module, especially coma and field curvature. The shorter focal length also helps to enhance the field of view of the AR lens module. The field of view of the AR lens module provided in this embodiment is ±15°.

[0081] The effective focal length F3 of the third lens 3 is F3 = -4mm to -3.6mm. The third lens is designed with a negative focal length, which is typically used in AR lens modules to correct astigmatism and field curvature. Setting the effective focal length within the range of -4mm to -3.6mm provides sufficient correction capability to ensure high-quality imaging. The negative focal length also helps to balance the light distribution of the AR lens module, improving light energy utilization.

[0082] The effective focal length F4 of the fourth lens 4 is F4 = -15mm to -11mm. Setting the effective focal length of the fourth lens 4 to a large negative range further enhances the AR lens module's ability to correct astigmatism and field curvature. The larger negative focal length also helps optimize the back focal length of the AR lens module, making it easier to integrate the AR lens module with other components (such as optical waveguide devices).

[0083] The effective focal length F5 of the fifth lens 5 is F5 = 9mm to 13mm. As the last lens in the module, the fifth lens 5 helps to provide sufficient image magnification and sharpness while maintaining the compactness of the module.

[0084] 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. The focal length of each lens in the lens group has been carefully designed to ensure that they work together to correct various aberrations and improve the overall performance of the AR lens module.

[0085] In some examples of this application, the AR lens module satisfies: 3.6 < (F1 + F2 + F5) / L < 4.8; 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.

[0086] Among them, 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.

[0087] When (F1+F2+F5) / L < 4.8, and L, the total optical length of the AR lens module, is fixed at 5mm, it indicates that the sum of the positive optical power of the first lens 1, the second lens 2, and the fifth lens 5 will not be particularly large. This means that the optical power distribution among these five lenses is relatively uniform, with no single lens exhibiting excessively high optical power. This uniform distribution helps reduce the sensitivity of the AR lens module to the manufacturing tolerances of individual lenses, improving the stability and reliability of the AR lens module.

[0088] 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.

[0089] When (F1+F2+F5) / L is greater than 3.6, it imposes certain limitations on L, the total optical length of the AR lens module. If L is too large, the sum of F1, F2, and F5 will have to become larger to meet this ratio requirement, leading to uneven distribution of optical power and potentially exceeding material or design limitations. Therefore, this condition helps control the module size within a reasonable range. A smaller module size not only improves wearing comfort but also contributes to more compact AR devices.

[0090] In summary, when an AR lens module meets the condition 3.6 < (F1 + F2 + F5) / L < 4.8, 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.

[0091] In some examples of this application, the AR lens module satisfies: -3.6 < (F3 + F4) / L < -2.5; 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.

[0092] The AR lens module provided in this application embodiment, in addition to satisfying the condition 3.6 < (F1 + F2 + F5) / L < 4.8 mentioned in the above example, also satisfies the condition -3.6 < (F3 + F4) / L < -2.5. 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 both lenses are negative.

[0093] When the ratio of (F3+F4) / L falls between -3.6 and -2.5, it indicates that the sum of the negative optical power of the third lens 3 and the fourth lens 4 is effectively controlled within a reasonable range. This helps to avoid excessive light divergence, thereby maintaining the compactness and image quality of the AR lens module.

[0094] By properly controlling the lens combination with negative optical power, the structure of the AR lens module can be further optimized 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.

[0095] 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.

[0096] Similar to positive power lenses, the manufacturing tolerances of negative power lenses also affect the overall performance of the system. When the ratio (F3+F4) / L is controlled within the range shown in the example above, the module's sensitivity to the manufacturing tolerances of individual lenses can be reduced. This helps improve product yield and consistency, and reduces manufacturing costs.

[0097] When the AR lens module meets the condition -3.6 < (F3 + F4) / L < -2.5, this condition helps to effectively manage negative optical power, optimize optical structure, balance image quality, and reduce tolerance sensitivity.

[0098] In one example of this application, the AR lens module satisfies: 3.6 < (F1 + F2 + F5) / L < 4.8, and -3.6 < (F3 + F4) / L < -2.5; 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.

[0099] 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 system compact. When both ratio conditions are satisfied, the AR lens module can 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.

[0100] See some examples in this application. Figure 1 The AR lens module satisfies: 6 < (A2 + A3 + A4) / (A1 + A5) < 17; 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.

[0101] According to this example of the application, the AR lens module is provided to satisfy the ratio: 6 < (A2 + A3 + A4) / (A1 + A5) < 17. This ratio ensures that the air gap between the second lens 2, the third lens 3, and the fourth lens 4 in the middle of the module is relatively large, while the air gap between the first lens 1 and the second lens 2, and between the fifth lens 5 and the display chip 6 at both ends is relatively small. This design helps to provide sufficient space for light adjustment and correction for the central lens while maintaining the compactness of the module, thereby improving image quality without increasing the overall size of the module.

[0102] Specifically, the larger central air gap (A2+A3+A4) helps increase the optical path difference between lenses, enabling the AR lens module to more effectively correct aberrations and chromatic aberrations. The smaller end air gaps (A1+A5) help reduce light loss and distortion when entering and exiting the AR lens module, ensuring the sharpness of image edges.

[0103] By properly controlling the air gaps between the lenses, the overall optical performance of the AR lens module can be optimized, such as increasing the field of view, improving resolution, and reducing distortion. At the same time, this design also helps improve the module's light energy utilization and contrast, resulting in brighter and clearer displayed images.

[0104] When the AR lens module satisfies the ratio condition of 6 < (A2 + A3 + A4) / (A1 + A5) < 17, it can improve the imaging quality while maintaining the compactness of the AR lens module, and enhance the convenience of manufacturing and assembly. These technical effects act together in the design and optimization process of the AR lens module, contributing to the design of an AR lens module with excellent performance, compact structure, easy manufacturing, and assembly.

[0105] In some examples of this application, refer to Figure 1 , the AR lens module satisfies: 2.3 < L / (A2 + A3 + A4) < 3.1; where L is the total optical length of the AR lens module.

[0106] The AR lens module of this application, when satisfying the ratio of 6 < (A2 + A3 + A4) / (A1 + A5) < 17 mentioned in the above examples, also satisfies the ratio range constraint of 2.3 < L / (A2 + A3 + A4) < 3.1.

[0107] When the value of L / (A2 + A3 + A4) is between 2.3 and 3.1, it means that the AR lens module provides sufficient space for light adjustment and correction between the lenses while maintaining compactness. This balance helps to minimize the overall volume of the module while ensuring the imaging quality, thus meeting the requirements of miniaturization and lightweight for augmented reality devices.

[0108] By controlling the ratio of L to (A2 + A3 + A4), the propagation path of light in the AR lens module can be optimized more effectively. This helps to reduce the number of refractions and reflections of light between the lenses, reduce the loss of light energy, and improve the light energy utilization rate of the system. At the same time, optimizing the light path also helps to reduce aberrations and distortions and improve the clarity of imaging.

[0109] In an example of this application, the AR lens module satisfies: 6 < (A2 + A3 + A4) / (A1 + A5) < 17, 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.

[0110] When the AR lens module simultaneously satisfies the two ratio conditions of 6 < (A2 + A3 + A4) / (A1 + A5) < 17 and 2.3 < L / (A2 + A3 + A4) < 3.1, it can optimize the light path and improve the imaging quality while maintaining the compactness of the AR lens module.

[0111] In some examples of this application, the first lens 1 to the fourth lens 4 are plastic aspherical lenses; the fifth lens 5 is a glass aspherical lens.

[0112] Plastic lenses are significantly lighter than glass lenses. By designing the first four lenses in the lens group as plastic aspherical lenses, the weight of the entire AR lens module can be significantly reduced, which is crucial for improving the wearing comfort of augmented reality (AR) devices.

[0113] While plastic lenses have advantages in weight and cost, glass lenses are generally superior in terms of thermal stability and durability.

[0114] 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.

[0115] 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.

[0116] See some examples in this application. Figure 1 The AR lens module includes an aperture stop, which is located on the side of the first lens 1 away from the second lens 2; the air gap between the aperture stop and the first lens 1 is ≤0.2mm; and the aperture of the aperture stop is 3.2mm to 3.5mm.

[0117] The aperture stop is located on the side of the first lens 1 that is away from the second lens 2, that is, the aperture stop is located at the front end of the AR lens module.

[0118] The air gap between the aperture and the first lens 1 is ≤0.2mm. This close arrangement helps to reduce light scattering and stray light generation.

[0119] The aperture of the aperture is controlled between 3.2 mm and 3.5 mm. This size range helps to confine light, improve light energy utilization, and efficiently couple with subsequent optical waveguide devices.

[0120] The aperture design of the aperture helps to achieve efficient coupling with subsequent optical waveguide devices, reducing light loss during the coupling process, thereby improving the optical efficiency and image quality of the entire AR lens module.

[0121] In some examples of this application, the total optical length L of the AR lens module is 5.5 mm;

[0122] The maximum effective aperture of the AR lens module is 3.3mm.

[0123] First, the overall optical length L is 5.5mm, which is a compact design. In augmented reality (AR) devices, the size and weight of the AR lens module have a significant impact on the wearing comfort of the AR optical display device. A smaller overall optical length means that the AR lens module can be more easily integrated into the AR optical display device, helping to reduce the overall weight and size of the device, thereby improving user wearing comfort.

[0124] Secondly, the maximum effective aperture of the AR lens module is 3.3mm, a parameter reflecting its light-gathering capability and image quality. The size of the effective aperture directly affects the amount of light the AR lens module can capture, thus influencing the brightness and clarity of the image. By rationally designing the internal structure and lens parameters of the AR lens module, a large effective aperture is achieved while maintaining a small overall optical length, thereby ensuring good image quality.

[0125] The AR lens module provided in this application achieves high-quality imaging while reducing module size and weight through a compact overall optical length and a large maximum effective aperture. This design not only improves the wearing comfort of AR optical display devices but also ensures that users can obtain a clear and bright visual experience during use.

[0126] 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.

[0127] Table 1

[0128]

[0129] Table 2 (Aspherical parameters of five lenses)

[0130]

[0131]

[0132] The optical performance of the AR lens module provided in this application embodiment is described in [reference]. Figure 3 and Figure 4 :

[0133] 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 12%, 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.

[0134] 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 >0.6 at 125lp / mm, indicating that the AR lens module produces clear images.

[0135] According to another embodiment of this application, an optical display device is provided, comprising:

[0136] As described above, the AR lens module; and

[0137] The aperture of the aperture stop of the AR lens module is matched with the entrance pupil diameter of the optical waveguide device.

[0138] The AR lens module of this application is described in detail below through Examples 1 to 4.

[0139] Example 1

[0140] 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;

[0141] The first lens 1 is a meniscus plastic aspherical lens, the second lens 2 to the fourth lens 4 are plastic aspherical lenses, and the fifth lens 5 is a meniscus glass aspherical lens; and 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;

[0142] The CRA of the AR lens module is 15°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0143] 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 ≤0.2mm;

[0144] The aperture of the aperture is 3.2mm to 3.5mm.

[0145] The total optical length L of the AR lens module is 5.5mm, and the maximum effective aperture of the AR lens module is 3.3mm.

[0146] 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.

[0147] Table 3

[0148]

[0149] Table 4 (Aspherical parameters of five lenses)

[0150]

[0151]

[0152] For the optical performance of the AR lens module provided in Embodiment 1 of this application, please refer to... Figure 6 :

[0153] 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.

[0154] Example 2

[0155] 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;

[0156] The first lens 1 is a meniscus plastic aspherical lens, the second lens 2 to the fourth lens 4 are plastic aspherical lenses, and the fifth lens 5 is a meniscus glass aspherical lens; and 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;

[0157] The CRA of the AR lens module is 15°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0158] 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 ≤0.2mm;

[0159] The aperture of the aperture is 3.2mm to 3.5mm.

[0160] The total optical length L of the AR lens module is 5.5mm, and the maximum effective aperture of the AR lens module is 3.3mm.

[0161] 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.

[0162] Table 5

[0163]

[0164] Table 6 (Aspherical parameters of five lenses)

[0165]

[0166]

[0167] For the optical performance of the AR lens module provided in Embodiment 2 of this application, please refer to... Figure 8 :

[0168] 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 >0.4 at 125lp / mm, indicating that the AR lens module produces clear images.

[0169] Example 3

[0170] 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;

[0171] The first lens 1 is a meniscus plastic aspherical lens, the second lens 2 to the fourth lens 4 are plastic aspherical lenses, and the fifth lens 5 is a meniscus glass aspherical lens; and 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;

[0172] The CRA of the AR lens module is 15°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0173] 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 ≤0.2mm;

[0174] The aperture of the aperture is 3.2mm to 3.5mm.

[0175] The total optical length L of the AR lens module is 5.5mm, and the maximum effective aperture of the AR lens module is 3.3mm.

[0176] 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.

[0177] Table 7

[0178]

[0179] Table 8 (Aspherical parameters of five lenses)

[0180]

[0181]

[0182] For the optical performance of the AR lens module provided in Embodiment 3 of this application, please refer to... Figure 10 :

[0183] 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 >0.4 at 125lp / mm, indicating that the AR lens module produces clear images.

[0184] Example 4

[0185] 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;

[0186] The first lens 1 is a meniscus plastic aspherical lens, the second lens 2 to the fourth lens 4 are plastic aspherical lenses, and the fifth lens 5 is a meniscus glass aspherical lens; and 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;

[0187] The CRA of the AR lens module is 15°, where CRA is the angle between the principal ray of the edge field of view and the optical axis of the display chip.

[0188] 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 ≤0.2mm;

[0189] The aperture of the aperture is 3.2mm to 3.5mm.

[0190] The total optical length L of the AR lens module is 5.5mm, and the maximum effective aperture of the AR lens module is 3.3mm.

[0191] 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.

[0192] Table 9

[0193]

[0194]

[0195] Table 10 (Aspherical parameters of five lenses)

[0196]

[0197]

[0198] For the optical performance of the AR lens module provided in Embodiment 4 of this application, please refer to... Figure 12 :

[0199] 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 >0.4 at 125lp / mm, indicating that the AR lens module produces clear images.

[0200] 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.

[0201] 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, 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) and the fifth lens (5) are meniscus aspherical lenses, and both the first lens (1) and the fifth lens (5) are curved towards the air gap between the third lens (3) and the fourth lens (4). The CRA of the AR lens module is 15°, and CRA is the angle between the chief ray of the marginal field of view and the optical axis of the display chip (6). The AR lens module satisfies: 3.6 < (F1 + F2 + F5) / L < 4.8; 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. The AR lens module satisfies: -3.6 < (F3 + F4) / L < -2.5; 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.

2. The AR lens module according to claim 1, characterized in that, Four of the first lens (1) to the fifth lens (5) are plastic lenses.

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

4. The AR lens module according to claim 1, characterized in that, The effective focal length F1 of the first lens (1) is 6.9 mm to 7.6 mm. The effective focal length F2 of the second lens (2) is 4.7 mm to 5.4 mm. The effective focal length F3 of the third lens (3) is -4 mm to -3.6 mm.

5. The AR lens module according to claim 4, characterized in that, The effective focal length F4 of the fourth lens (4) is -15 mm to -11 mm. The effective focal length F5 of the fifth lens (5) is 9 mm to 13 mm.

6. The AR lens module according to claim 1, characterized in that, The AR lens module satisfies: 6 < (A2 + A3 + A4) / (A1 + A5) < 17; 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: 2.3 < L / (A2 + A3 + A4) < 3.1; where, L is the total optical length of the AR lens module.

8. The AR lens module according to claim 2, characterized in that, The first lens (1) to the fourth lens (4) are plastic aspherical lenses. The fifth lens (5) is a glass aspherical lens.

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 and the first lens (1) is ≤0.2mm; The aperture of the aperture is 3.2mm to 3.5mm.

10. The AR lens module according to claim 9, characterized in that, The total optical length L of the AR lens module is 5.5mm; The maximum effective aperture of the AR lens module is 3.3mm.

11. An optical display device, characterized in that, include: 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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