AR lens module and optical display device

Abstract

The embodiment of the invention provides an AR lens module and optical display equipment. The AR lens module is used for the full-color AR light machine and comprises an AR lens, and the AR lens is composed of a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along the same optical axis. The focal power of the first lens and the focal power of the second lens are positive, the first lens and the second lens are plano-convex lenses, the focal power of the third lens is negative, the focal power of the fourth lens is positive, and the fourth lens is a meniscus lens bent towards the side away from the third lens. The AR lens satisfies the following formula: N1gt; n3gt, N3gt; n2gt; n3, N4, and 19.2 lt; (N1 * F1-N3 * F3) lt; 25; wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, N4 is the refractive index of the fourth lens, F1 is the effective focal length of the first lens, and F3 is the effective focal length of the third lens.

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] With the development of augmented reality technology, the market has put forward higher and higher requirements on the size and weight of wearable AR optical display devices. For wearable AR optical display devices (such as smart glasses), smaller size and lighter weight can significantly improve the wearing comfort of users. However, the size and weight of current wearable AR optical display devices largely depend on the AR lens module inside them. Traditional AR lens modules often cause optical display devices to be bulky and heavy because they contain complex lighting optical paths and large imaging lenses (including many lenses).

[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 full-color AR optical machine, and includes an AR lens, wherein the AR lens is composed of a first lens, a second lens, a third lens, and a fourth lens arranged in sequence along the same optical axis;

[0006] The first lens and the second lens have positive focal powers, and both are plano-convex lenses; the third lens has negative focal power; the fourth lens has positive focal power, and the fourth lens is a meniscus lens curved toward a side away from the third lens;

[0007] The AR lens satisfies: N1>N3>N2>N4, and 19.2<(N1*F1-N3*F3)<25; wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, N4 is the refractive index of the fourth lens, F1 is the effective focal length of the first lens, and F3 is the effective focal length of the third lens.

[0008] Optionally, the AR lens module further includes an X-cube color-combining prism and a display chip;

[0009] Wherein, the X-cube color combining prism is located between the fourth lens and the display chip, and the fourth lens is bent toward the X-cube color combining prism;

[0010] The CRA of the AR lens module is 12°, and the CRA is the included angle between the chief ray of the marginal field of view and the optical axis of the display chip.

[0011] Optionally, three of the first lens to the fourth lens are plastic lenses, and the other lens is a glass lens.

[0012] Optionally, the first lens is a glass aspherical mirror, and the second lens, the third lens, and the fourth lens are all plastic aspherical mirrors.

[0013] Optionally, the effective focal length F1 of the first lens is 7.4 mm to 8.3 mm;

[0014] The effective focal length F2 of the second lens is 7.4 mm to 8.3 mm;

[0015] The effective focal length F3 of the third lens is -5 mm to -4.2 mm;

[0016] The effective focal length F4 of the fourth lens is 6 mm to 12 mm.

[0017] Optionally, the AR lens module satisfies: 2.3 < (F1 + F2 + F4) / L < 3.6; where F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F4 is the effective focal length of the fourth lens, and L is the optical total length of the AR lens module.

[0018] Optionally, the AR lens module satisfies: 3.6 < Q*F1 / F2 < 4.4; where Q is the maximum aperture of the lenses from the first lens to the fourth lens.

[0019] Optionally, the AR lens module satisfies: 3.5 < Q*A1 / A2 < 4.3; 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, and Q is the maximum aperture of the lenses from the first lens to the fourth lens.

[0020] Optionally, the AR lens module satisfies: 2.6 < L / (A1 + A2 + A3 + A4) < 3.2; where A3 is the air gap between the third lens and the fourth lens, A4 is the air gap between the fourth lens and the X-cube dichroic prism, and L is the optical total length of the AR lens module.

[0021] Optionally, the AR lens module further includes a diaphragm, and the diaphragm is located on the side of the first lens facing away from the second lens;

[0022] The air gap between the aperture and the first lens is ≤0.1 mm;

[0023] The aperture of the aperture is 3.6 mm to 3.9 mm.

[0024] Optionally, the total optical length L of the AR lens module is 8.3±0.3 mm;

[0025] The maximum effective aperture of the AR lens module is 3.95 mm.

[0026] In a second aspect, the present application provides an optical display device. The optical display device comprises:

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

[0028] Optical waveguide device, the aperture of the diaphragm of the AR lens module matches the entrance pupil diameter of the optical waveguide device.

[0029] The beneficial effects of this application are:

[0030] The AR lens module provided in the embodiment of the present application realizes the miniaturization of the AR lens module through the carefully designed lens combination and layout. Compared with the traditional AR lens module, the AR lens module of the present application reduces the volume and weight, so that the AR optical machine using the AR lens module can be more portable. Although the volume of the AR lens is greatly reduced, the optical performance is still excellent, especially the surface design of the first lens and the fourth lens, which further reduces the field curvature, improves the modulation transfer function (MTF), and ensures the clarity and sharpness of the image.

[0031] In this application, by rationally designing the refractive index of lenses at different positions, the propagation path of light can be better controlled to achieve better optical performance. In addition, by setting the range of 19.2<(N1*F1-N3*F3)<25, the refraction path of light after passing through different lenses can be adjusted to effectively correct aberrations such as spherical aberration and chromatic aberration. This optimization can improve imaging quality, reduce image distortion and color distortion, and make AR display clearer and more realistic.

[0032] Since the AR lens module of the embodiment of the present application is small in size and has high imaging quality, it can significantly improve the user experience of the augmented reality device. Users can wear the device for a longer period of time without feeling tired, while enjoying a clear fusion of virtual and reality.

[0033] 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

[0034] 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.

[0035] Figure 1 This is one of the structural schematic diagrams of the AR lens module provided in the embodiment of the present application;

[0036] Figure 2 The second structural diagram of the AR lens module provided in the embodiment of the present application;

[0037] Figure 3 for Figure 2 Distortion diagram of the provided AR lens module;

[0038] Figure 4 for Figure 2 The modulation transfer function diagram of the AR lens module provided;

[0039] Figure 5 The third structural diagram of the AR lens module provided in the embodiment of the present application;

[0040] Figure 6 for Figure 5 The modulation transfer function diagram of the AR lens module provided;

[0041] Figure 7 The fourth structural diagram of the AR lens module provided in the embodiment of the present application;

[0042] Figure 8 for Figure 7 The modulation transfer function diagram of the AR lens module provided;

[0043] Fig. 9 The fifth structural diagram of the AR lens module provided in the embodiment of the present application;

[0044] Fig.10 for Fig. 9 The modulation transfer function diagram of the AR lens module provided;

[0045] Fig.11 The sixth structural diagram of the AR lens module provided in the embodiment of the present application;

[0046] Fig.12 for Fig.11 Modulation transfer function diagram of the AR lens module provided.

[0047] Description of reference numerals:

[0048] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. X-cube color combining prism; 6. Display chip. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] According to one embodiment of the present application, an AR lens module is provided, wherein the AR lens module is used for a full-color AR optical machine, see Figure 1 , the AR lens module includes an AR lens, and the AR lens is composed of a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4 arranged in sequence along the same optical axis; the optical power of the first lens 1 and the second lens 2 is positive, and both are plano-convex lenses, the optical power of the third lens 3 is negative, the optical power of the fourth lens 4 is positive, and the fourth lens 4 is a meniscus lens curved toward a side away from the third lens 3; the AR lens satisfies: N1>N3>N2>N4, and 19.2<(N1*F1-N3*F3)<25; wherein N1 is the refractive index of the first lens 1, N2 is the refractive index of the second lens 2, N3 is the refractive index of the third lens 3, N4 is the refractive index of the fourth lens 4, F1 is the effective focal length of the first lens 1, and F3 is the effective focal length of the third lens 3.

[0056] The AR lens module provided in the embodiment of the present application is a miniaturized AR lens module for a full-color AR lens. The AR lens module in the embodiment of the present application not only achieves significant miniaturization in volume, but also reduces its overall weight while ensuring excellent imaging quality, providing new technical guidance for the application of full-color AR technology. Through the new optical architecture design and optimization, the AR lens module provided in the embodiment of the present application can still provide clear and colorful images while maintaining a compact structure, fully demonstrating its technical advantages in the field of augmented reality.

[0057] The AR lens module provided in the embodiment of the present application is suitable for a full-color AR optical machine.

[0058] Specifically, the AR lens module provided in the embodiment of the present application includes an AR lens, which is designed to be composed of four lenses, namely a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4. The four lenses are arranged in sequence along the same optical axis. This arrangement is conducive to the orderly transmission of light and the control of imaging quality. Figure 1 The first lens 1 is located on a side close to the aperture, and the fourth lens 4 is adjacent to the X-cube color combining prism 5 arranged at the rear.

[0059] The AR lens of this application, see Figure 1 , wherein the first lens 1 and the second lens 2 have positive focal lengths and are both plano-convex lenses. This design helps to reduce the angle of light, can control the aperture of the entire AR lens module, and effectively reduce the spherical aberration caused by the large aperture, thereby improving the imaging quality. For example, the maximum effective aperture of the AR lens module (mainly referring to the AR lens therein) provided in the embodiment of the present application is only 3.95 mm, which is much lower than the existing full-color AR lens system.

[0060] See also Figure 1 In the AR lens, the third lens 3 has a negative focal length, which can be used to further correct aberrations and optimize the optical path. The fourth lens 4 has a positive focal length, and the fourth lens 4 is a meniscus lens that is curved toward the side away from the third lens 3. This design helps to reduce field curvature and improve the modulation transfer function (MTF), thereby improving the clarity and detail performance of the image.

[0061] The AR lens module provided in the embodiment of the present application significantly reduces the volume of the AR lens module by optimizing the optical design of the lens group, including the surface shape and optical focal length matching, and especially adopting a combination of a plano-convex lens and a meniscus lens, with a specific optical focal length layout.

[0062] The AR lens of the present application satisfies: N1>N3>N2>N4, and 19.2<(N1*F1-N3*F3)<25; wherein N1 is the refractive index of the first lens 1, N2 is the refractive index of the second lens 2, N3 is the refractive index of the third lens 3, and N4 is the refractive index of the fourth lens 4; F1 is the effective focal length of the first lens 1, and F3 is the effective focal length of the third lens 3.

[0063] According to the above relationship, it can be seen that the refractive index N1 of the first lens 1 is the highest, followed by the refractive index N3 of the third lens 3, then the refractive index N2 of the second lens, and finally the refractive index N4 of the fourth lens. In the present application, by reasonably designing the refractive index of lenses at different positions, the propagation path of light can be better controlled, thereby achieving better optical performance.

[0064] The refractive index and effective focal length of the lens directly affect the refraction and focusing ability of light. By setting the range of 19.2<(N1*F1-N3*F3)<25, the refraction path of light after passing through different lenses can be adjusted to effectively correct aberrations such as spherical aberration and chromatic aberration. This optimization can improve imaging quality, reduce image distortion and color distortion, and make AR display clearer and more realistic.

[0065] In summary, the AR lens module provided in the embodiment of the present application realizes the miniaturization of the AR lens module through the carefully designed lens combination and layout. Compared with the traditional AR lens module, the AR lens module of the present application reduces the volume and weight, so that the AR optical machine using the AR lens module can be more portable. Although the volume of the AR lens is greatly reduced, the optical performance is still excellent, especially the surface design of the first lens and the fourth lens, which further reduces the field curvature, improves the modulation transfer function (MTF), and ensures the clarity and sharpness of the image.

[0066] In this application, by rationally designing the refractive index of lenses at different positions, the propagation path of light can be better controlled to achieve better optical performance. In addition, by setting the range of 19.2<(N1*F1-N3*F3)<25, the refraction path of light after passing through different lenses can be adjusted to effectively correct aberrations such as spherical aberration and chromatic aberration. This optimization can improve imaging quality, reduce image distortion and color distortion, and make AR display clearer and more realistic.

[0067] Since the AR lens module of the embodiment of the present application is small in size and has high imaging quality, it can significantly improve the user experience of the augmented reality device. Users can wear the device for a longer period of time without feeling tired, while enjoying a clear fusion of virtual and reality.

[0068] In some examples of the present application, the AR lens module also includes an X-cube color combining prism 5 and a display chip 6; wherein the X-cube color combining prism 5 is located between the fourth lens 4 and the display chip 6, and the fourth lens 4 is bent toward the X-cube color combining prism 5; the CRA of the AR lens module is 12°, and CRA is the angle between the main light of the edge field of view and the optical axis of the display chip 6.

[0069] The AR lens module provided in the embodiment of the present application includes, in addition to the AR lens, an X-cube color-combining prism 5 and a display chip 6. The X-cube color-combining prism is used to combine light of different colors into a full-color image, which is a key optical component in a full-color AR optical display device. The display chip 6 is the source of image generation.

[0070] The AR lens module provided in the embodiment of the present application has a CRA of 12°, that is, the angle between the main ray of the edge field of view and the optical axis of the display chip 6 is 12°. This CRA value design enables the AR lens module to further reduce the size of the AR optical machine while ensuring a sufficient field of view, which is conducive to improving the wearing comfort of the AR optical display device.

[0071] The size of CRA directly affects the image quality. If the CRA is too large, the light may not be focused correctly on the pixel, resulting in problems such as color shading or brightness shading. In this application, setting the CRA to 12° helps reduce these problems and improve image clarity and color reproduction.

[0072] The AR lens module of the embodiment of the present application achieves miniaturization and weight reduction, which is of great significance for improving the wearing comfort of augmented reality devices. Although the volume of the AR lens module is reduced, by optimizing the lens design and selecting appropriate materials, the embodiment of the present application still ensures good imaging quality and meets the user's demand for high-quality visual experience.

[0073] In summary, the AR lens module of the embodiment of the present application achieves a balance between volume, weight and imaging quality, providing strong support for the development of augmented reality devices.

[0074] In some examples of the present application, three lenses among the first lens 1 to the fourth lens 4 are plastic lenses, and the other lens is a glass lens.

[0075] In the example of the present application, three lenses among the first lens 1 to the fourth lens 4 are designed to be plastic lenses. This design can reduce the weight of the entire AR lens module.

[0076] The density of plastic lenses is much lower than that of glass lenses, so using plastic lenses can significantly reduce the weight of the entire AR lens module. For augmented reality (AR) devices, reducing weight is one of the key factors to improve wearing comfort and user experience.

[0077] Plastic materials have good plasticity and formability, which makes it possible to design more complex aspheric lenses. Aspheric lenses can provide better optical performance, such as reducing aberrations and improving imaging quality. Therefore, the use of plastic lenses can increase the flexibility of the entire AR lens module design to meet higher performance optical requirements.

[0078] In addition, compared with glass lenses, plastic lenses have better impact resistance. In application scenarios such as AR optical display devices that are susceptible to accidental collisions or falls, the use of plastic lenses can reduce the risk of lens breakage and improve the durability and reliability of the device.

[0079] In the lens assembly of the present application, one lens is a glass lens, which has high refractive index, low dispersion and good thermal stability and can produce high-quality images.

[0080] In the AR lens module design of this application, a combination of three plastic lenses and one glass lens is selected. This choice is based on the balance between imaging quality, weight, cost and manufacturability. By using a glass lens, it can be ensured that the AR lens module has excellent imaging performance in key parts, such as reducing chromatic aberration and improving resolution. At the same time, the use of three plastic lenses can reduce the overall weight and cost of the AR lens module.

[0081] In other words, by combining glass lenses and plastic lenses, the present application achieves an optimal balance between imaging quality and cost. This design not only ensures the high performance of the AR lens module, but also reduces the manufacturing cost.

[0082] In some examples of the present application, the first lens 1 is a glass aspherical lens, and the second lens 2, the third lens 3 and the fourth lens 4 are all plastic aspherical lenses.

[0083] See also Figure 1 In the lens assembly of the present application, the first lens 1 is a glass aspherical mirror. Glass materials have high refractive index, low dispersion and excellent thermal stability, and can produce high-quality images. The aspherical design can effectively reduce spherical aberration and other aberrations and improve imaging quality. Designing the first lens 1 as a glass aspherical mirror can ensure that the light can be well corrected when entering the rear optical transmission device (such as an optical waveguide device).

[0084] Please continue to see Figure 1In the lens group of the present application, the second lens 2, the third lens 3 and the fourth lens 4 are all plastic aspherical lenses. Plastic materials have the advantages of light weight, low cost and easy processing. The aspherical design can also reduce aberrations and improve imaging quality. The material and surface shape combination of the second lens 2, the third lens 3 and the fourth lens 4 can reduce the overall weight and cost of the AR lens module while ensuring imaging quality.

[0085] In this application, the glass aspherical mirror is used as a lens near the aperture (exit pupil), which can effectively correct the aberration and distortion of light when entering subsequent optical devices, and can provide a better imaging basis. The use of plastic aspherical mirrors, while ensuring lightweight and low cost, also reduces aberrations and distortions, further improving the imaging quality. Overall, this design combination can produce high-definition, low-distortion, and high-contrast images, meeting the needs of AR optical display devices for high-quality imaging.

[0086] In some examples of the present application, the effective focal length F1 of the first lens 1 is 7.4 mm to 8.3 mm, the effective focal length F2 of the second lens 2 is 7.4 mm to 8.3 mm, the effective focal length F3 of the third lens 3 is -5 mm to -4.2 mm, and the effective focal length F4 of the fourth lens 4 is 6 mm to 12 mm.

[0087] In the lens assembly of the present application, the first lens 1 and the second lens 2 are both designed to have a positive effective focal length and the same focal length range. This design helps to control the angle of light entering the lens module, thereby controlling the aperture of the module while ensuring sufficient light throughput. For example, the maximum effective aperture of the AR lens module in the embodiment of the present application is 3.95 mm.

[0088] The third lens 3 is designed to have a negative effective focal length, which makes it have the effect of diverging light. Introducing a negative focal length lens in the AR lens module can correct aberrations introduced by a positive focal length lens, such as spherical aberration and coma, thereby improving imaging quality.

[0089] From the outside, negative focal length lenses also help achieve a wider field of view because the divergent light can cover a larger field of view. In AR optical display devices, this means that users can see a wider range of real world and virtual information fusion.

[0090] The fourth lens 4 is designed to have a relatively large positive effective focal length range (6 mm to 12 mm), which helps to further correct aberrations, especially field curvature and distortion, thereby producing a more uniform image quality in the entire field of view.

[0091] The focal length combination of the four lenses provided in this example of the present application is positive, positive, negative, positive (in order from the first lens 1 to the fourth lens 4). By reasonably matching lenses with positive and negative focal lengths, the AR lens module design in the present application can effectively correct various aberrations and distortions, and improve the clarity and contrast of the image.

[0092] In this application, the focal length design of the four lenses works together on the entire field of view to ensure that high-quality images can be obtained from the center to the edge. Among them, the third lens 3 with a negative focal length helps to achieve a wider field of view, allowing the AR device to provide a more immersive user experience. The larger positive focal length design of the fourth lens 4 enhances the telephoto capability of the AR lens module, allowing it to maintain good imaging performance when it needs to focus on objects at a longer distance.

[0093] In some examples of the present application, the AR lens module satisfies: 2.3<(F1+F2+F4) / L<3.6; wherein F1 is the effective focal length of the first lens 1, F2 is the effective focal length of the second lens 2, F4 is the effective focal length of the fourth lens 4, and L is the total optical length of the AR lens module.

[0094] 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 fourth lens 4 are all positive, which means that the optical power of the three lenses is positive.

[0095] When (F1+F2+F4) / L<3.6, and L, i.e., the total optical length of the AR lens module, is fixed and is 8.3±0.3 mm, it means that the positive focal power of the first lens 1, the second lens 2, and the fourth lens 4 will not be particularly large when added together. This means that the positive focal power distribution among the three lenses is relatively uniform, and no single lens has an excessively prominent focal power. This uniform distribution helps reduce the sensitivity of the AR lens module to the manufacturing tolerances of a single lens and improves the stability and reliability of the AR lens module.

[0096] Specifically: by limiting the upper limit of the ratio of (F1+F2+F4) / L, the uniform distribution of optical power among multiple lenses is ensured, avoiding a single lens from taking on too much optical power, thereby reducing performance fluctuations caused by manufacturing tolerances.

[0097] The uniform distribution of optical power reduces the module's dependence on the manufacturing accuracy of a single lens. Even if there is a certain tolerance in the manufacturing of a certain lens, it will not have a significant impact on the imaging quality of the entire module.

[0098] Uniform optical power distribution and reduced tolerance sensitivity together improve the stability and reliability of the AR lens module, enabling it to maintain stable imaging performance during long-term use.

[0099] When (F1 + F2 + F4) / L is greater than 2.3, it has a certain limiting effect on L, i.e., the total optical length of the AR lens module. This condition ensures that the optical power is reasonably distributed within a limited space, avoiding uneven distribution of optical power caused by an overly large total length L. If L is too large, in order to meet this ratio condition, the sum of F1, F2, and F4 will have to become larger, which may lead to uneven distribution of optical power and even exceed the material or design limitations. Therefore, this condition helps to control the size of the module within a reasonable range and achieve the following effects:

[0100] By setting the lower limit of (F1 + F2 + F4) / L, an effective constraint is formed on the total optical length L of the AR lens module, preventing the unlimited expansion of the module size and facilitating the realization of a more compact AR device.

[0101] The smaller module size not only reduces the weight of the device but also helps to improve the wearing comfort, making the AR optical display device more suitable for long-term wearing.

[0102] The compact AR lens module makes it possible to miniaturize the AR optical display device, promoting the application and development of AR technology in more fields.

[0103] In summary, when the AR lens module satisfies the condition 2.3 < (F1 + F2 + F4) / L < 3.6, especially when F1, F2, and F4 are all positive optical powers, this condition plays an important role in achieving uniform distribution of optical power, reducing tolerance sensitivity, controlling the module size, and improving imaging quality. These advantages together contribute to the high performance, low cost, and easy manufacturability of the AR lens module, providing strong support for the development of AR technology.

[0104] In some examples of this application, the AR lens module satisfies: 3.6 < Q*F1 / F2 < 4.4; where Q is the maximum aperture of the lenses among the first lens 1 to the fourth lens 4.

[0105] The ratio Q*F1 / F2 in this example of this application reflects the relationship of optical power distribution between the first lens 1 and the second lens 2, and at the same time takes into account the maximum aperture Q of the lenses in the lens group. This ratio helps to ensure the reasonable distribution of optical power among different lenses, avoiding an overly large optical power burden on a single lens.

[0106] When Q*F1 / F2 is greater than 3.6, it means that the product of the optical power of the first lens 1 and the maximum aperture Q reaches a certain level relative to the optical power of the second lens 2. This helps to ensure that the first lens 1 plays an appropriate role in the AR lens module without causing a decrease in imaging quality due to too small optical power.

[0107] The upper limit value of Q*F1 / F2 is 4.4, which helps to maintain good optical performance while controlling the size of the AR lens module. If the ratio is too large, it may cause the size of the AR lens module to be too large, which is not conducive to the miniaturization and light weight of the AR optical display device. By setting this upper limit, while ensuring the performance of the AR lens module, its maximum size can be restricted, thus achieving a balance between size and performance.

[0108] When Q*F1 / F2 is within the range of 3.6 to 4.4, it can ensure that the first lens and the second lens work together in the module to correct aberrations jointly, improving the clarity and resolution of imaging. In addition, due to the consideration of the maximum aperture Q of the lens group, this condition also helps to ensure stable imaging performance of the AR lens module at different field angles.

[0109] In an example of the present application, the AR lens module provided by the embodiment of the present application, on the basis of satisfying the condition 2.3 < (F1 + F2 + F4) / L < 3.6 mentioned in the above example, also satisfies the condition: 3.6 < Q*F1 / F2 < 4.4.

[0110] When the AR lens module provided by the present application simultaneously satisfies the conditions: 2.3 < (F1 + F2 + F4) / L < 3.6 and 3.6 < Q*F1 / F2 < 4.4, significant technical effects can be achieved in aspects such as optimizing the optical power distribution, improving the imaging quality, realizing miniaturization of volume and light weight, and enhancing the design flexibility and reliability. These effects together improve the overall performance of the AR lens module.

[0111] In some examples of the present application, the AR lens module satisfies: 3.5 < Q*A1 / A2 < 4.3; 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, and Q is the maximum aperture of the lenses from the first lens 1 to the fourth lens 4.

[0112] Among them, A1 and A2 respectively represent the air gaps between the first lens 1 and the second lens 2 and between the second lens 2 and the third lens 3. These air gaps have an important impact on the optical performance of the AR lens module because they affect the light propagation path and aberration correction.

[0113] By setting the ratio range of Q*A1 / A2, this constraint condition ensures that the design of the air gap plays a key role in optimizing the performance of the AR lens module.

[0114] Among the constraints provided in this example of the present application, the introduction of the maximum aperture Q as a parameter further enhances the binding force of the conditions. The maximum aperture of the lens group not only determines the light transmission of the AR lens module but also affects the size and weight of the AR lens module.

[0115] By combining the ratio of Q to the air gap, this constraint ensures that while pursuing high optical performance in the design of the AR lens module, the physical size and weight limitations of the AR lens module are also taken into account.

[0116] By optimizing the air gap, this constraint also helps to reduce aberrations in the AR lens module, such as spherical aberration and coma, thereby improving the imaging quality. Clear images are crucial for augmented reality (AR) applications as they provide a more realistic and immersive user experience.

[0117] In some examples of the present application, the AR lens module satisfies: 2.6 < L / (A1 + A2 + A3 + A4) < 3.2; where 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 X-cube dichroic prism 5, and L is the total optical length of the AR lens module.

[0118] In this example of the present application, the ratio relationship between all the air gaps (A1 + A2 + A3 + A4) in the AR lens module and the total optical length L of the AR lens module is described. This reflects the importance of the reasonable allocation of air gaps in the design of the AR lens module for the overall optical performance. By setting this ratio range, it can be ensured that the AR lens module has good optical performance while maintaining a compact structure.

[0119] A1, A2, A3, and A4 respectively represent the air gaps between adjacent optical components in the AR lens module. These gaps are crucial for controlling the propagation of light, correcting aberrations, and optimizing the imaging quality. Setting a reasonable air gap ratio helps to achieve effective light management and good aberration correction inside the AR lens module, thereby improving the imaging quality.

[0120] As the total optical length of the AR lens module in the present application, L is an important optical design parameter in the design of the AR lens module. It directly determines the physical size and weight of the AR lens module, and thus affects the wearing comfort of the AR optical display device. By setting the ratio of L to the air gap within a certain range (see this example of the present application), the size of the AR lens module can be effectively controlled while ensuring the optical performance.

[0121] In an example of the present application, the AR lens module satisfies: 3.5 < Q * A1 / A2 < 4.3 and 2.6 < L / (A1 + A2 + A3 + A4) < 3.2; 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 X-cube dichroic prism 5, L is the total optical length of the AR lens module, and Q is the maximum aperture of the lenses from the first lens 1 to the fourth lens 4.

[0122] In this example, by comprehensively considering the relationship among the lens aperture, air gap, and total optical length, these two conditions have produced remarkable technical effects in terms of improving imaging quality, achieving compactness of the AR lens module, and enhancing design flexibility. These effects jointly promote the improvement of the performance of the AR lens module and the reduction of costs, providing strong support for the wide application of AR technology.

[0123] In some examples of the present application, referring to Figure 1 , 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 ≤ 0.1 mm; the aperture of the diaphragm is 3.6 mm to 3.9 mm.

[0124] Among them, the diaphragm is located on the side of the first lens 1背离 the second lens 2, that is, the diaphragm is located at the very front end of the AR lens module.

[0125] The air gap between the diaphragm and the first lens 1 ≤ 0.1 mm, and this distance is very close. By restricting the air gap between the diaphragm and the first lens, the light scattering and loss caused by too large an interval can be minimized, thereby improving the light utilization rate and imaging quality.

[0126] The aperture of the diaphragm is controlled between 3.6 mm and 3.9 mm, and this size range helps to constrain light, improve the light energy utilization rate, and efficiently couple with the subsequent optical waveguide device.

[0127] The aperture design of the diaphragm helps to achieve efficient coupling with the subsequent optical waveguide device, reduce the loss of light during the coupling process, and thus improve the optical efficiency and image quality of the entire AR lens module.

[0128] In some examples of the present application, the total optical length L of the AR lens module is 8.3 ± 0.3 mm; the maximum effective aperture of the AR lens module is 3.95 mm.

[0129] The setting of the total optical length L to 8.3±0.3mm shows the highly precise control of the size of the AR lens module. This size control not only affects the physical size of the AR lens module, but also directly affects the optical performance and imaging quality of the AR lens module. By strictly limiting the total optical length, it can ensure that the AR lens module can achieve the expected optical effect while maintaining a compact size.

[0130] The maximum effective aperture of the AR lens module is 3.95mm, and this value is selected based on the precise calculation of the amount of light entering. The size of the aperture directly determines the amount of light that the AR lens module can receive, which in turn affects the brightness and clarity of the image. The 3.95mm aperture ensures that enough light enters while avoiding excessive stray light interference, and is a balance between image quality and the volume of the AR lens module.

[0131] For a specific example, see Figure 2 , the main parameters of the AR lens module design are:

[0132] Focal length: 6.05mm;

[0133] Field of view: ±15°;

[0134] Relative aperture: 1 / 1.62;

[0135] Pixel size: 4μm;

[0136] Working band: 455~630nm.

[0137] The first lens 1 to the fifth lens 4 in the AR lens module are aspherical lenses, and their optical parameters are shown in Tables 1 and 2 below, respectively.

[0138] Table 1

[0139]

[0140] Table 2 (Aspheric parameters of four lenses)

[0141]

[0142]

[0143] For the optical performance of the AR lens module provided in this specific example of the present application, see Figure 3 and Figure 4 :

[0144] Figure 3 This is the distortion diagram of the AR lens module, see Figure 3The AR lens module provided in the example of this application has an absolute distortion value of less than 9%, 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.

[0145] 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 >0.7 at 125lp / mm, indicating that the AR lens module has clear imaging.

[0146] According to another embodiment of the present application, an optical display device is provided, comprising: an AR lens module and an optical waveguide device as described above, wherein the aperture of the aperture of the AR lens module matches the entrance pupil diameter of the optical waveguide device.

[0147] The AR lens module of the present application is described in detail below through Examples 1 to 4.

[0148] Example 1

[0149] The AR lens module provided in this embodiment 1 is shown in FIG. Figure 5 , including an AR lens, an X-cube color combining prism 5 and a display chip 6 arranged along the same optical axis; the AR lens is composed of a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4 arranged in sequence, and the fourth lens 4 is arranged adjacent to the X-cube color combining prism 5;

[0150] The first lens 1 and the second lens 2 have positive focal powers, and both are plano-convex lenses; the third lens 3 has negative focal power; the fourth lens 4 has positive focal power, and the fourth lens 4 is a meniscus lens curved toward the display chip;

[0151] The CRA of the AR lens module is 12°, where CRA is the angle between the main ray of the edge field of view and the optical axis of the display chip;

[0152] 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 ≤0.1 mm;

[0153] The aperture of the aperture is 3.6 mm to 3.9 mm.

[0154] The total optical length L of the AR lens module is 8.3±0.3 mm, and the maximum effective aperture of the AR lens module is 3.95 mm.

[0155] In the AR lens module provided in this embodiment 1, the optical parameters of the first lens 1 to the X-cube color combining prism 5 are shown in Tables 3 and 4 below.

[0156] Table 3

[0157]

[0158]

[0159] Table 4 (Aspheric parameters of four lenses)

[0160]

[0161] For the optical performance of the AR lens module provided in Example 1 of the present application, see Figure 6 :

[0162] 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 1 is >0.7 at 125lp / mm, indicating that the AR lens module has clear imaging.

[0163] Example 2

[0164] The AR lens module provided in this embodiment 2 is shown in FIG. Figure 7 , including an AR lens, an X-cube color combining prism 5 and a display chip 6 arranged along the same optical axis; the AR lens is composed of a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4 arranged in sequence, and the fourth lens 4 is arranged adjacent to the X-cube color combining prism 5;

[0165] The first lens 1 and the second lens 2 have positive focal powers, and both are plano-convex lenses; the third lens 3 has negative focal power; the fourth lens 4 has positive focal power, and the fourth lens 4 is a meniscus lens curved toward the display chip;

[0166] The CRA of the AR lens module is 12°, where CRA is the angle between the main ray of the edge field of view and the optical axis of the display chip;

[0167] 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 ≤0.1 mm;

[0168] The aperture of the aperture is 3.6 mm to 3.9 mm.

[0169] The total optical length L of the AR lens module is 8.3±0.3 mm, and the maximum effective aperture of the AR lens module is 3.95 mm.

[0170] In the AR lens module provided in this embodiment 2, the optical parameters of the first lens 1 to the X-cube color combining prism 5 are shown in Tables 5 and 6 below.

[0171] Table 5

[0172]

[0173]

[0174] Table 6 (Aspheric parameters of four lenses)

[0175]

[0176] For the optical performance of the AR lens module provided in Example 2 of the present application, see Figure 8 :

[0177] 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 >0.7 at 125lp / mm, indicating that the AR lens module has clear imaging.

[0178] Example 3

[0179] The AR lens module provided in this embodiment 3 is shown in FIG. Fig. 9 , including an AR lens, an X-cube color combining prism 5 and a display chip 6 arranged along the same optical axis; the AR lens is composed of a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4 arranged in sequence, and the fourth lens 4 is arranged adjacent to the X-cube color combining prism 5;

[0180] The first lens 1 and the second lens 2 have positive focal powers, and both are plano-convex lenses; the third lens 3 has negative focal power; the fourth lens 4 has positive focal power, and the fourth lens 4 is a meniscus lens curved toward the display chip;

[0181] The CRA of the AR lens module is 12°, where CRA is the angle between the main ray of the edge field of view and the optical axis of the display chip;

[0182] 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 ≤0.1 mm;

[0183] The aperture of the aperture is 3.6 mm to 3.9 mm.

[0184] The total optical length L of the AR lens module is 8.3±0.3 mm, and the maximum effective aperture of the AR lens module is 3.95 mm.

[0185] In the AR lens module provided in this embodiment 3, the optical parameters of the first lens 1 to the X-cube color combining prism 5 are shown in Tables 7 and 8 below.

[0186] Table 7

[0187]

[0188]

[0189] Table 8 (Aspheric parameters of four lenses)

[0190]

[0191] For the optical performance of the AR lens module provided in Example 3 of the present application, see Fig.10 :

[0192] 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 >0.68 at 125lp / mm, indicating that the AR lens module has clear imaging.

[0193] Example 4

[0194] The AR lens module provided in this embodiment 4 is shown in FIG. Fig.11 , including an AR lens, an X-cube color combining prism 5 and a display chip 6 arranged along the same optical axis; the AR lens is composed of a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4 arranged in sequence, and the fourth lens 4 is arranged adjacent to the X-cube color combining prism 5;

[0195] The first lens 1 and the second lens 2 have positive focal powers, and both are plano-convex lenses; the third lens 3 has negative focal power; the fourth lens 4 has positive focal power, and the fourth lens 4 is a meniscus lens curved toward the display chip;

[0196] The CRA of the AR lens module is 12°, where CRA is the angle between the main ray of the edge field of view and the optical axis of the display chip;

[0197] 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 ≤0.1 mm;

[0198] The aperture of the aperture is 3.6 mm to 3.9 mm.

[0199] The total optical length L of the AR lens module is 8.3±0.3 mm, and the maximum effective aperture of the AR lens module is 3.95 mm.

[0200] In the AR lens module provided in this embodiment 4, the optical parameters of the first lens 1 to the X-cube color combining prism 5 are as shown in Tables 9 and 10 below.

[0201] Table 9

[0202]

[0203]

[0204] Table 10 (Aspheric parameters of four lenses)

[0205]

[0206] For the optical performance of the AR lens module provided in Example 4 of the present application, see Fig.12 :

[0207] 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 >0.73 at 125lp / mm, indicating that the AR lens module has clear imaging.

[0208] 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.

[0209] 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 full-color AR optical machine, characterized in that: It includes an AR lens, and the AR lens is composed of a first lens (1), a second lens (2), a third lens (3), and a fourth lens (4) arranged in sequence along the same optical axis; The optical powers of the first lens (1) and the second lens (2) are positive, and both are plano-convex lenses. The optical power of the third lens (3) is negative, and the optical power of the fourth lens (4) is positive. The fourth lens (4) is a meniscus lens curved toward the side背离 the third lens (3); The AR lens satisfies: N1 > N3 > N2 > N4, and 19.2 < (N1 * F1 - N3 * F3) < 25; where N1 is the refractive index of the first lens (1), N2 is the refractive index of the second lens (2), N3 is the refractive index of the third lens (3), N4 is the refractive index of the fourth lens (4), F1 is the effective focal length of the first lens (1), and F3 is the effective focal length of the third lens (3).

2. The AR lens module according to claim 1, characterized in that: The AR lens module further includes an X-cube dichroic prism (5); Among them, the X-cube dichroic prism (5) is located between the fourth lens (4) and the display chip (6), and the fourth lens (4) is bent toward the X-cube dichroic prism (5); The CRA of the AR lens module is 12°, and the CRA is the angle between the chief ray of the marginal field of view and the optical axis of the display chip (6).

3. The AR lens module according to claim 1, characterized in that: Among the first lens (1) to the fourth lens (4), three lenses are plastic lenses, and the other lens is a glass lens.

4. The AR lens module according to claim 3, characterized in that: The first lens (1) is a glass aspheric mirror, and the second lens (2), the third lens (3), and the fourth lens (4) are all plastic aspheric mirrors.

5. The AR lens module according to claim 1, characterized in that: The effective focal length F1 of the first lens (1) is 7.4 mm to 8.3 mm; The effective focal length F2 of the second lens (2) is 7.4 mm to 8.3 mm; The effective focal length F3 of the third lens (3) is -5 mm to -4.2 mm; The effective focal length F4 of the fourth lens (4) is 6 mm to 12 mm.

6. The AR lens module according to claim 2, characterized in that: The AR lens module satisfies: 2.3 < (F1 + F2 + F4) / L < 3.6; where F1 is the effective focal length of the first lens (1), F2 is the effective focal length of the second lens (2), F4 is the effective focal length of the fourth lens (4), and L is the optical total length of the AR lens module.

7. The AR lens module according to claim 6, characterized in that: The AR lens module satisfies: 3.6 < Q * F1 / F2 < 4.4; where Q is the maximum aperture of the lenses from the first lens (1) to the fourth lens (4).

8. The AR lens module according to claim 2, characterized in that: The AR lens module satisfies: 3.5 < Q * A1 / A2 < 4.3; 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), and Q is the maximum aperture of the lenses from the first lens (1) to the fourth lens (4).

9. The AR lens module according to claim 8, characterized in that: The AR lens module satisfies: 2.6 < L / (A1 + A2 + A3 + A4) < 3.2; where 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 X-cube dichroic prism (5), and L is the total optical length of the AR lens module.

10. The AR lens module according to any one of claims 1 to 9, characterized in that: The AR lens module further 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) ≤ 0.1 mm; The aperture of the diaphragm is 3.6 mm to 3.9 mm.

11. The AR lens module according to claim 10, characterized in that: The total optical length L of the AR lens module is 8.3 ± 0.3 mm; The maximum effective aperture of the AR lens module is 3.95 mm.

12. An optical display device, characterized in that: Comprising: The AR lens module according to any one of claims 1-11; And A waveguide device, wherein the aperture of the diaphragm of the AR lens module matches the entrance pupil diameter of the waveguide device.

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