Ar lens module and optical display device

Abstract

Embodiments of the present application provide an AR lens module and an optical display device; the AR lens module is used for a full-color AR light machine, and comprises an AR lens composed of a first lens, a second lens, a third lens and a fourth lens arranged in sequence along the same optical axis; the first lens and the second lens have positive refractive power, and both are plano-convex lenses; the third lens has negative refractive power; the fourth lens has positive refractive power, and is a meniscus lens curved towards the side away from the third lens; 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.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of optical display, and more particularly, to an AR lens module and an optical display device. BACKGROUND

[0002] With the development of augmented reality technology, the market puts forward higher and higher requirements on the volume and weight of wearable AR optical display devices. For wearable AR optical display devices (such as smart glasses), smaller volume and lighter weight can significantly improve the wearing comfort of users. However, the volume and weight of the current wearable AR optical display devices are largely dependent on the AR lens module inside. The traditional AR lens module often leads to a bulky optical display device and a heavy weight due to the complex illumination light path and the large imaging lens (including many lenses).

[0003] Therefore, it has become a key problem to be solved in the field of augmented reality technology to develop an AR lens module that can significantly reduce the volume and weight while ensuring excellent imaging quality. SUMMARY

[0004] The purpose of the present application is to provide a new technical solution of 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 light machine, and includes an AR lens 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 refractive power and are both plano-convex lenses, the third lens has negative refractive power, and the fourth lens has positive refractive power and is a meniscus lens curved toward the 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] The X-cube color combining prism is located between the fourth lens and the display chip, and the fourth lens is curved 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 edge 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 aspheric lens, and the second lens, the third lens and the fourth lens are plastic aspheric lenses.

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

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

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

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

[0017] Optionally, the AR lens module satisfies: 2.3<(F1+F2+F4) / L<3.6; wherein 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 total optical length of the AR lens module.

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

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

[0020] Optionally, the AR lens module satisfies: 2.6<L / (A1+A2+A3+A4)<3.2; wherein 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 color combining prism, and L is the total optical length of the AR lens module.

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

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

[0023] The aperture of the light barrier is 3.6mm-3.9mm.

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

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

[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] A light waveguide device, the aperture of the light barrier of the AR lens module matches the entrance pupil diameter of the light waveguide device.

[0029] The present application has the following beneficial effects:

[0030] The AR lens module provided by the embodiments of the present application realizes the miniaturization of the volume of the AR lens module through the careful design of the 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 light 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 face type design of the first lens and the fourth lens, which further reduces the field curvature and improves the modulation transfer function (MTF), ensuring the sharpness and clarity of the image.

[0031] In the present application, the refractive index of the lens at different positions is reasonably designed to better control the propagation path of light, thereby achieving better optical performance. Furthermore, by setting the range of 19.2<(N1*F1-N3*F3)<25, the refractive path of light after passing through different lenses can be adjusted, thereby effectively correcting aberrations such as spherical aberration and chromatic aberration. This optimization can improve the imaging quality, reduce image distortion and color distortion, and make the AR display clearer and more realistic.

[0032] Due to the small size and high imaging quality of the AR lens module of the embodiments of the present application, the user experience of the augmented reality device can be significantly improved. Users can wear the device for a longer period of time without feeling tired, while enjoying a clear virtual and real fusion picture.

[0033] Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0034] 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.

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

[0036] Figure 2 This is the second schematic diagram of the structure of the AR lens module provided in the embodiments of this 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 provided AR lens module;

[0039] Figure 5 This is the third schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

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

[0041] Figure 7 This is the fourth schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

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

[0043] Figure 9 Fifth schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

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

[0045] Figure 11 This is the sixth schematic diagram of the structure of the AR lens module provided in the embodiments of this application;

[0046] Figure 12 for Figure 11 The provided modulation transfer function diagram for the AR lens module.

[0047] Explanation of reference numerals in the attached figures:

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

[0049] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement of the components and steps illustrated in these embodiments, numerical expressions, and numerical values are merely examples, and do not limit the scope of the present application unless specifically stated otherwise.

[0050] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the scope of the application or its application or uses.

[0051] Techniques and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification where appropriate.

[0052] In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0053] Note that like reference numerals and letters indicate like items in the accompanying drawings and, as such, once an item is defined in one drawing, it is not necessary to discuss it further in subsequent drawings.

[0054] The AR lens module and optical display device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0055] According to one embodiment of the present application, an AR lens module for a full-color AR light machine is provided, referring to Figure 1 , the AR lens module includes an AR lens 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 first lens 1 and the second lens 2 have positive refractive power and are both plano-convex lenses, the third lens 3 has negative refractive power, the fourth lens 4 has positive refractive power, and the fourth lens 4 is a meniscus lens curved toward the side away from 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.

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

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

[0058] Specifically, the AR lens module provided by the embodiment of the present application comprises an AR lens designed by four lenses, namely a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4, which are sequentially arranged along the same optical axis. This arrangement is helpful for the orderly transmission of light and the control of imaging quality. Figure 1 The first lens 1 is located on the side close to the diaphragm, and the fourth lens 4 is adjacently arranged with an X-cube color combining prism 5 arranged at the rear.

[0059] The AR lens of the present application, referring to Figure 1 The optical power of the first lens 1 and the second lens 2 in the AR lens is positive, and the face type of both is a plano-convex lens. This design is helpful for reducing the angle of light, can control the aperture size of the entire AR lens module, and effectively reduces 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 by the embodiment of the present application is only 3.95 mm, which is much lower than the existing specification of full-color AR lens system.

[0060] Referring to Figure 1 In the AR lens, the optical power of the third lens 3 is negative, which can be used for further correction of aberration and optimization of the optical path. The optical power of the fourth lens 4 is positive, and the fourth lens 4 is a meniscus lens curved towards the side away from the third lens 3. This design is helpful for reducing the field curvature, improving the modulation transfer function (MTF), and thereby improving the definition and detail performance of the image.

[0061] The AR lens module provided by 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 face type and the matching of the optical power, especially by adopting the combination of plano-convex lenses and meniscus lenses, and matching the specific optical power 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 indices 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, thereby effectively correcting aberrations such as spherical aberration and chromatic aberration. This optimization can improve imaging quality, reduce image distortion and color distortion, making AR display clearer and more realistic.

[0065] In summary, the AR lens module provided by the embodiments of the present application realizes the miniaturization of the AR lens module by carefully designing the lens combination and layout. Compared with traditional AR lens modules, the AR lens module of the present application reduces the volume and weight, thereby making the AR light machine using the AR lens module more portable. Despite the significant reduction in the volume of the AR lens, the optical performance is still excellent, especially the face type design of the first lens and the fourth lens, which further reduces the field curvature and improves the modulation transfer function (MTF), ensuring the sharpness and clarity of the image.

[0066] In the present application, by reasonably designing the refractive indices of lenses at different positions, the propagation path of light can be better controlled, thereby achieving better optical performance. Moreover, 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, thereby effectively correcting aberrations such as spherical aberration and chromatic aberration. This optimization can improve imaging quality, reduce image distortion and color distortion, making AR display clearer and more realistic.

[0067] Due to the small size and high imaging quality of the AR lens module of the present application, the user experience of augmented reality devices can be significantly improved. Users can wear the device for a longer period of time without feeling tired, while enjoying clear virtual and real fusion images.

[0068] In some examples of the present application, the AR lens module further comprises an X-cube color combiner 5 and a display chip 6; wherein the X-cube color combiner 5 is located between the fourth lens 4 and the display chip 6, and the fourth lens 4 is bent towards the X-cube color combiner 5; the CRA of the AR lens module is 12°, which is the angle between the chief ray of the edge field of view and the optical axis of the display chip 6.

[0069] The AR lens module provided by the embodiments of the present application comprises an X-cube color combiner 5 and a display chip 6 in addition to the AR lens. The X-cube color combiner is used to combine light rays 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 by the embodiments of the present application has a CRA of 12°, which is the angle between the chief ray of the edge field of view and the optical axis of the display chip 6. This value of the CRA enables the AR lens module to further reduce the volume of the AR optical machine while ensuring a sufficient field of view, thereby improving the wearing comfort of the AR optical display device.

[0071] The size of the CRA directly affects the imaging quality. If the CRA is too large, it may cause the light rays to fail to focus correctly on the pixels, thereby causing problems such as color shadows or brightness shadows. In the present application, the CRA is set to 12°, which helps to reduce these problems and improve the clarity and color restoration of the image.

[0072] The AR lens module of the embodiments of the present application realizes the miniaturization of the volume and the reduction of the weight, which is of great significance to improving the wearing comfort of the augmented reality device. Although the volume of the AR lens module is reduced, the embodiments of the present application still ensure good imaging quality by optimizing the lens design and selecting appropriate materials, thereby meeting the needs of users for high-quality visual experience.

[0073] In summary, the AR lens module of the embodiments of the present application balances the volume, weight and imaging quality, thereby providing strong support for the development of augmented reality devices.

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

[0075] In the examples of the present application, three of the first lens 1 to the fourth lens 4 are designed as plastic lenses, which 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 aspherical lenses. Aspherical lenses can provide better optical performance, such as reducing aberrations, improving imaging quality, etc. Therefore, using 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 prone to accidental collisions or drops, using plastic lenses can reduce the risk of lens breakage and improve the durability and reliability of the device.

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

[0080] In the AR lens module design of the present application, a combination of three plastic lenses and one glass lens is selected. This selection is based on a balance between imaging quality, weight, cost, and manufacturability. By using one glass lens, the AR lens module can have excellent imaging performance in key areas, such as reducing chromatic aberration, improving resolution, etc. At the same time, using 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] Referring to Figure 1 In the lens group of the present application, the first lens 1 is a glass aspherical lens. Glass materials have high refractive index, low dispersion, and excellent thermal stability, and can produce high-quality images. Aspherical design can effectively reduce spherical aberration and other aberrations, improving imaging quality. Designing the first lens 1 as a glass aspherical lens can ensure that the light rays are well corrected when entering the rear optical transmission device (such as an optical waveguide device).

[0084] Please continue to refer to 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 material has the advantages of lightweight, low cost and easy to process. Aspherical design can also reduce aberration and improve imaging quality. The material and surface type 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 the present application, the glass aspherical lens as the lens of the low beam (exit pupil) can effectively correct the aberration and distortion of the light when entering the subsequent optical device, and can provide a better imaging basis. The use of plastic aspherical lenses not only ensures lightweight and low cost, but also reduces aberration and distortion, further improving imaging quality. Overall, this design combination can produce high-definition, low-distortion and high-contrast images, meeting the demand for high-quality imaging of AR optical display devices.

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

[0087] In the lens group of the present application, the first lens 1 and the second lens 2 are designed to have positive effective focal lengths with 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 of the present application is 3.95mm.

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

[0089] From the outside, the negative focal length lens also helps to achieve a wider field of view, because the diverging light can cover a larger field of view. In the AR optical display device, this means that the user can see a wider view of the real world and virtual information fusion.

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

[0091] The focal length combination of the four lenses provided in this example is positive-positive-negative-positive (in the order of the first lens 1 to the fourth lens 4). By reasonably matching the positive and negative focal length lenses, 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 the present application, the focal length design of the four lenses collectively acts on the entire field of view to ensure that high-quality images can be obtained from the center to the edge. Among them, the negative focal length of the third lens 3 helps to achieve a wider field of view, so that the AR device can 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, so that it can still maintain good imaging performance when focusing on objects at a 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] 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 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, the total optical length of the AR lens module, is fixed and is 8.3±0.3mm, it means that the positive optical power of the first lens 1, the second lens 2 and the fourth lens 4 is not particularly large. This means that the positive optical power among the three lenses is relatively evenly distributed, and the optical power of a single lens is not too prominent. This uniform distribution helps to reduce the sensitivity of the AR lens module to the manufacturing tolerance 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, and the single lens is avoided from bearing too large optical power task, thereby reducing the performance fluctuations caused by manufacturing tolerances.

[0097] The uniform distribution of optical power reduces the dependence of the module on the manufacturing precision of a single lens. Even if there is a certain tolerance in the manufacturing of a certain lens, it will not significantly affect the imaging quality of the entire module.

[0098] The uniform distribution of optical power and the reduced tolerance sensitivity together improve the stability and reliability of the AR lens module, so that it can maintain stable imaging performance in long-term use.

[0099] When (F1+F2+F4) / L is greater than 2.3, there is a certain limitation on the total optical length L of the AR lens module. This condition ensures a reasonable distribution of optical power in a limited space, avoiding uneven distribution of optical power due to excessive total length L. If L is too large, the sum of F1, F2 and F4 will have to become larger in order to meet the ratio condition, which may lead to uneven distribution of optical power, even beyond the limits of materials or design. Therefore, this condition helps to control the size of the module within a reasonable range and achieves the following effects:

[0100] By setting the lower limit of (F1+F2+F4) / L, the total optical length L of the AR lens module is effectively constrained, preventing unlimited expansion of the module size, which is conducive to achieving a more compact AR device.

[0101] A 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 wear.

[0102] A 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 focal lengths, this condition plays an important role in achieving uniform distribution of optical power, reducing tolerance sensitivity, controlling module size and improving imaging quality. These advantages collectively promote the high performance, low cost and ease of manufacturing of the AR lens module, providing strong support for the development of AR technology.

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

[0105] The Q*F1 / F2 ratio in this example of the present application reflects the relationship between the optical power of the first lens 1 and the second lens 2, taking into account the maximum aperture Q of the lenses in the lens group. This ratio helps to ensure a reasonable distribution of optical power among different lenses, avoiding excessive optical power burden on individual lenses.

[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, while not causing a decrease in imaging quality due to too small optical power.

[0107] The upper limit of Q*F1 / F2 is 4.4, which helps to maintain good optical performance of the AR lens module while controlling the size of the AR lens module. If the ratio is too large, it may cause 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, the maximum size of the AR lens module can be limited while ensuring its performance, thereby achieving a balance between size and performance.

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

[0109] In one example of the present application, the AR lens module provided by the embodiments of the present application meets the condition 3.6<Q*F1 / F2<4.4 in addition to the condition 2.3<(F1+F2+F4) / L<3.6 mentioned in the above examples.

[0110] When the AR lens module provided by the present application meets the conditions 2.3<(F1+F2+F4) / L<3.6 and 3.6<Q*F1 / F2<4.4 at the same time, it can produce significant technical effects in optimizing power distribution, improving imaging quality, achieving small size and light weight, and enhancing design flexibility and reliability. These effects collectively improve the overall performance of the AR lens module.

[0111] In some examples of the present application, the AR lens module meets the condition 3.5<Q*A1 / A2<4.3; wherein A1 is the air gap between the first lens 1 and the second lens 2, A2 is the air gap between the second lens 2 and the third lens 3, and Q is the maximum aperture of the lenses in the first lens 1 to the fourth lens 4.

[0112] Wherein 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 influence on the optical performance of the AR lens module, as they affect the propagation path of light and aberration correction.

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

[0114] In the constraint condition provided in this example of the present application, the maximum aperture Q is introduced as a parameter, further enhancing the constraint of the condition. The maximum aperture of the lens group not only determines the light throughput of the AR lens module, but also affects the size and weight of the AR lens module.

[0115] By combining Q with the ratio of air gap, this constraint condition ensures that the AR lens module design not only pursues high optical performance, but also takes into account the physical size and weight limitations of the AR lens module.

[0116] By optimizing the air gap, this constraint condition also helps to reduce aberrations such as spherical aberration, coma, etc. in the AR lens module, 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 color combiner 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 air gaps (A1+A2+A3+A4) in the AR lens module and the total optical length L of the AR lens module is described, which reflects the importance of reasonable distribution of air gaps in the AR lens module design for 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 imaging quality. Setting a reasonable air gap ratio helps to effectively manage light and correct aberrations within the AR lens module, thereby improving imaging quality.

[0120] L is the total optical length of the AR lens module in the present application, which 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 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 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; wherein A1 is the air gap between the first lens 1 and the second lens 2, A2 is the air gap between the second lens 2 and the third lens 3, A3 is the air gap between the third lens 3 and the fourth lens 4, A4 is the air gap between the fourth lens 4 and the X-cube 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, these two conditions take into account the relationship between lens aperture, air gap and total optical length, which significantly improves imaging quality, realizes compactness of the AR lens module, enhances design flexibility and other aspects. These effects collectively promote the improvement of AR lens module performance and the reduction of cost, providing strong support for the widespread application of AR technology.

[0123] In some examples of the present application, referring to Figure 1 , the AR lens module includes a diaphragm located on the side of the first lens 1 away from the second lens 2; the air gap between the diaphragm and the first lens 1 is ≤0.1mm; and the aperture of the diaphragm is 3.6mm-3.9mm.

[0124] The diaphragm is located on the side of the first lens 1 away from the second lens 2, i.e. the diaphragm is located at the front end of the AR lens module.

[0125] The air gap between the diaphragm and the first lens 1 is ≤0.1mm, which is very close. By limiting the air gap between the diaphragm and the first lens, the light scattering and loss caused by excessive gap can be minimized, thereby improving the utilization of light and the imaging quality.

[0126] The aperture of the diaphragm is controlled to be between 3.6mm and 3.9mm, which helps to constrain light, improve light energy utilization, and efficiently couple with subsequent optical waveguide devices.

[0127] The aperture design of the diaphragm helps to achieve efficient coupling with subsequent optical waveguide devices, reducing light loss during coupling, thereby improving 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±0.3mm; and the maximum effective aperture of the AR lens module is 3.95mm.

[0129] The setting of the total optical length L of 8.3±0.3mm shows a high-precision control on the size of the AR lens module. This size control not only concerns 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 be ensured that the AR lens module can achieve the expected optical effect while maintaining a compact volume.

[0130] The maximum effective aperture of the AR lens module is 3.95mm, which is based on the accurate calculation of the amount of light entering. The size of the aperture directly determines how much light the AR lens module can receive, which in turn affects the brightness and clarity of the image. The aperture of 3.95mm not only ensures enough light entering, but also avoids excessive stray light interference, which is a balance point between imaging quality and AR lens module volume.

[0131] In a specific example, referring to 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 waveband: 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 Table 1 and Table 2 as follows.

[0138] Table 1

[0139]

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

[0141]

[0142]

[0143] The optical performance of the AR lens module provided in this specific example of the present application is shown in Figure 3 and Figure 4 :

[0144] Figure 3 is the distortion chart of the AR lens module, referring to Figure 3The AR lens module provided by the examples of the present application has an absolute value of distortion less than 9%, which means that the AR lens module has small distortion in the imaging process and can fully meet the imaging requirements of users on the AR optical display device.

[0145] Figure 4 For the modulation transfer function diagram of the AR lens module, see Figure 4 The MTF of the AR lens module provided by the embodiment 1 is greater than 0.7 at 125 lp / mm, which indicates that the AR lens module has clear imaging.

[0146] According to another embodiment of the present application, an optical display device is provided, which comprises the AR lens module and the optical waveguide device as described above, and the aperture of the stop 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 embodiments 1 to 4.

[0148] Embodiment 1

[0149] For the AR lens module provided by the embodiment 1, see Figure 5 , which comprises 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 refractive power and are both plano-convex lenses, the third lens 3 has negative refractive power, and the fourth lens 4 has positive refractive power and is a meniscus lens curved towards the display chip;

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

[0152] The AR lens module comprises a stop, and the stop is located on the side of the first lens 1 away from the second lens 2; the air gap between the stop and the first lens 1 is ≤0.1 mm;

[0153] The aperture of the stop 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 by the embodiment 1, the optical parameters of the first lens 1 to the X-cube color combining prism 5 are shown in Table 3 and Table 4.

[0156] Table 3

[0157]

[0158]

[0159] Table 4 (aspherical surface parameters of four lenses)

[0160]

[0161] The optical performance of the AR lens module provided in Embodiment 1 is shown in Table 4 and FIG. 3. Figure 6

[0162] Figure 6 The modulation transfer function (MTF) of the AR lens module is shown in FIG. 4. Figure 6 The MTF of the AR lens module provided in Embodiment 1 is greater than 0.7 at 125 lp / mm, indicating that the AR lens module has clear imaging.

[0163] Embodiment 2

[0164] The AR lens module provided in Embodiment 2 includes an AR lens, an X-cube color combiner 5 and a display chip 6 arranged along the same optical axis. Figure 7 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 combiner 5.

[0165] The first lens 1 and the second lens 2 are positive and are both plano-convex lenses, the third lens 3 is negative, and the fourth lens 4 is positive and is a meniscus lens curved towards the display chip.

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

[0167] The AR lens module includes a diaphragm, and the diaphragm is located on the side of the first lens 1 away from the second lens 2; the air gap between the diaphragm and the first lens 1 is ≤0.1 mm.

[0168] The aperture of the diaphragm 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] ​The optical parameters of the first lens 1 to the X-cube prism 5 in the AR lens module provided in Embodiment 2 are shown in Table 5 and Table 6.

[0171] Table 5

[0172]

[0173]

[0174] Table 6 (aspheric surface parameters of four lenses)

[0175]

[0176] The optical performance of the AR lens module provided in Embodiment 2 is shown in Figure 8 :

[0177] Figure 8 The modulation transfer function diagram of the AR lens module is shown in Figure 8 The MTF of the AR lens module provided in Embodiment 2 is greater than 0.7 at 125 lp / mm, indicating that the AR lens module has clear imaging.

[0178] Embodiment 3

[0179] The AR lens module provided in Embodiment 3 is shown in Figure 9 , which includes an AR lens, an X-cube 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 prism 5;

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

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

[0182] The AR lens module includes a diaphragm, and the diaphragm is located on the side of the first lens 1 away from the second lens 2; the air gap between the diaphragm and the first lens 1 is ≤0.1 mm;

[0183] The aperture of the diaphragm 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 (Aspherical parameters of the four lenses)

[0190]

[0191] For the optical performance of the AR lens module provided in Embodiment 3 of this application, please refer to... Figure 10 :

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

[0193] Example 4

[0194] The AR lens module provided in Example 4 is described in [reference]. Figure 11 It includes 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 optical power and are both plano-convex lenses. The third lens 3 has negative optical power, and the fourth lens 4 has positive optical power and is a meniscus lens that bends toward the display chip.

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

[0197] 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 ≤0.1mm;

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

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

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

[0201] Table 9

[0202]

[0203]

[0204] Table 10 (aspheric surface parameters of four lenses)

[0205]

[0206] The optical performance of the AR lens module provided in Embodiment 4 is shown in Figure 12 :

[0207] Figure 12 The modulation transfer function diagram of the AR lens module is shown in Figure 12 The MTF of the AR lens module provided in Embodiment 4 is greater than 0.73 at 125lp / mm, indicating that the AR lens module has clear imaging.

[0208] The above embodiments mainly describe the differences between the embodiments. The different optimization features between the embodiments can be combined to form a better embodiment without contradiction. In view of the brevity of the text, the combination will not be described here.

[0209] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present application. Those skilled in the art should understand that the above embodiments can 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 engine, 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, 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 bent 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); The AR lens module further includes an X-cube dichroic prism (5), and 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 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; 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.

2. The AR lens module according to claim 1, characterized in that, The CRA of the AR lens module is 12°, and the CRA is the angle between the chief ray of the peripheral 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 aspherical mirror, and the second lens (2), the third lens (3) and the fourth lens (4) are all plastic aspherical mirrors.

5. The AR lens module according to claim 1, 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).

6. 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).

7. The AR lens module according to any one of claims 1-6, characterized in that, The AR lens module further includes an aperture stop, and the aperture stop is located on the side of the first lens (1)背离 the second lens (2); The air gap between the aperture stop and the first lens (1) ≤ 0.1 mm; The aperture of the aperture is 3.6mm~3.9mm.

8. An optical display device, characterized in that, include: AR lens module as described in any one of claims 1-7; 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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