Optical machine modules and optical projection equipment

Abstract

An embodiment of the present application provides an optical machine module and an optical projection device; wherein, the optical machine module includes a front aperture, a projection lens, an Xcube color combining prism and an image source arranged in sequence; the projection lens includes four aspherical lenses, and the directions from the front aperture to the Xcube color combining prism are the first lens, the second lens, the third lens and the fourth lens, respectively, and the projection lens has positive optical power; the image source includes red, green and blue μLED panels for emitting red, green and blue light respectively; the Xcube color combining prism is configured to combine the red, green and blue light from the image source to form a full-color image; the pixel size, angular resolution PPD and diagonal field of view DFOV of the image source satisfy the following conditions: 2.0≤Pixel Size×PPD×DFOV≤8.0.

Description

Technical Field

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

[0002] With the rapid development of AR technology, high resolution, high-quality imaging, and miniaturization have become important trends in AR optical engine design. μLED (MicroLED) optical engine technology, with its advantages of high brightness, high contrast, and low power consumption, is considered the ultimate choice for the AR optical engine industry.

[0003] However, existing μLED optical engines are mostly based on low-resolution designs, making them difficult to meet the demands of high-resolution imaging. Furthermore, traditional designs also have limitations in miniaturization. Therefore, developing a high-resolution and extremely miniaturized μLED AR optical engine module is of great significance. Summary of the Invention

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

[0005] In a first aspect, an embodiment of the present application provides an optical machine module, the optical machine module including: a front aperture, a projection lens, an Xcube color combining prism, and an image source arranged in sequence;

[0006] The projection lens includes four aspherical lenses, which are the first lens, the second lens, the third lens, and the fourth lens in the direction from the front aperture to the Xcube color combining prism, and the projection lens has positive optical power;

[0007] The image source includes red, green and blue μLED panels for emitting red, green and blue light respectively;

[0008] The Xcube color combining prism is configured to combine the red, green, and blue light from the image source to form a full-color image;

[0009] The pixel size, angular resolution PPD, and diagonal field of view DFOV of the image source satisfy the following relationship: 2.0≤Pixel Size×PPD×DFOV≤8.0.

[0010] Optionally, the total focal length f of the optical machine module, the length L of the Xcube color combining prism along the optical axis, and the air gap G between the Xcube color combining prism and the image source satisfy the following relationship: 0.2mm<fLG<2mm.

[0011] Optionally, the optical-mechanical module satisfies the following relationship:

[0012] 2≤Panel Size+G*tan(arcsin1 / 2F # )+L*tan{arcsin[sin(arcsin1 / 2F # )] / n dcube}≤5;

[0013] Wherein: Panel Size is the diagonal size of the image source, and 0.1 inches ≤ Panel Size ≤ 0.3 inches;

[0014] G is the air gap between the Xcube color combining prism and the image source;

[0015] L is the length of the Xcube color combining prism along the optical axis;

[0016] F # is the aperture number of the optical module, and 1≤F # ≤3;

[0017] n dcube is the refractive index of the Xcube color combining prism.

[0018] Optionally, the aperture number F of the optical machine module # Satisfy: 1≤F # ≤3, and the aperture number F # The ratio of the total focal length f of the optical machine module satisfies the relationship: 0.5≤F# / f≤5.

[0019] Optionally, the pixel size of the image source is 1.5 μm ≤ Pixel Size ≤ 8 μm.

[0020] Optionally, the effective focal lengths of the four aspherical lenses in the projection lens satisfy the relationship: 0.1<(f1+f4) / (f2+f3)<0.3, where:

[0021] f1 is the effective focal length of the first lens;

[0022] f2 is the effective focal length of the second lens;

[0023] f3 is the effective focal length of the third lens;

[0024] f4 is the effective focal length of the fourth lens;

[0025] The first lens and the fourth lens are biconvex lenses;

[0026] The second lens and the third lens are meniscus lenses.

[0027] Optionally, the first lens and the second lens have positive optical power, the third lens has negative optical power, and the fourth lens has positive optical power;

[0028] The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the total focal length f of the optical engine module satisfy the following relationship:

[0029] 0.7<f1 / f<1;

[0030] 5.9<f2 / f<10.3;

[0031] -0.5<f3 / f<-0.3;

[0032] 0.5<f4 / f<0.6.

[0033] Optionally, the effective focal length f1 of the first lens is: 4mm<f1<6mm;

[0034] The effective focal length f2 of the second lens is: 33mm<f2<58mm;

[0035] The effective focal length f3 of the third lens is: -3mm<f3<-2mm;

[0036] The effective focal length f4 of the fourth lens is: 3mm<f4<4mm.

[0037] Optionally, the total optical length of the optical engine module is L', which satisfies the following conditions: 0.7<(f1+f4) / L'<1.1, and 3.7<(f2+f3) / L'<6.8.

[0038] Optionally, the air gap between the first lens and the second lens is A1, the air gap between the second lens and the third lens is A2, the air gap between the third lens and the fourth lens is A3, and the air gap between the fourth lens and the Xcube color-combining prism is A4. The air gaps A1, A2, A3, and A4 satisfy the relationship: 0.7<(A1+A4) / (A2+A3)<0.9.

[0039] Optionally, the total optical length of the optical engine module is L', which satisfies the following conditions: 0.1<(A1+A4) / L'<0.2, and 0.1<(A2+A3) / L'<0.2.

[0040] Optionally, the total optical length L' of the optical machine module and the image height H of the image source satisfy the following relationship: 0.4<H / L'<0.5.

[0041] Optionally, the imaging distance of the optical machine module is infinity, the exit pupil distance of the front aperture is 0≤exit pupil distance<150mm, and the exit pupil distance is the distance along the optical axis from the surface of the front aperture close to the image source to the surface of the first lens away from the image source.

[0042] Optionally, the fourth lens is made of optical glass material.

[0043] In a second aspect, an embodiment of the present application provides an optical projection device, the optical projection device comprising:

[0044] The optical-mechanical module according to the first aspect; and

[0045] The optical waveguide device has a front aperture of the optical-mechanical module whose diameter matches the entrance pupil diameter of the optical waveguide device.

[0046] The beneficial effects of this application are:

[0047] The optical engine module provided in the embodiments of this application achieves high-resolution imaging and an extremely compact design by utilizing a positive-power projection lens composed of four aspherical lenses, combined with a red, green, and blue μLED panel and an Xcube color-combining prism. Specifically, the image source's pixel size, angular resolution (PPD), and diagonal field of view (FOV) are controlled within the specific relationship of 2.0 ≤ 2.0 ≤ Pixel Size × PPD × DFOV ≤ 8.0. This design ensures that the optical engine module maintains high resolution while providing a wide field of view (e.g., a FOV of up to 40°), thus meeting the high visual experience requirements of AR devices.

[0048] Furthermore, the combination of a projection lens composed of four aspherical elements and the Xcube color-combining prism effectively reduces aberrations, color distortion, and light loss, significantly improving optical efficiency and image quality. The use of aspherical lenses not only corrects aberrations that are difficult to eliminate with traditional spherical lenses, but also further promotes the miniaturization of optical modules by reducing the number and thickness of lenses required. The precise configuration of the Xcube color-combining prism ensures accurate color combination of red, green, and blue light, avoiding color distortion and improving image color reproduction.

[0049] In summary, the optical machine module of the embodiment of the present application achieves an extremely miniaturized design while maintaining high resolution and a large field of view, providing strong technical support for the development of AR devices and promoting the development of AR technology towards higher performance and greater portability.

[0050] 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

[0051] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0052] Figure 1 This is one of the structural diagrams of the optical-mechanical module provided in an embodiment of the present application;

[0053] Figure 2 for Figure 1 Distortion diagram of the provided optical-mechanical module;

[0054] Figure 3 for Figure 1 The MTF diagram of the optical-mechanical module provided;

[0055] Figure 4 for Figure 1 Relative illumination diagram of the provided optical engine module;

[0056] Figure 5 The second structural diagram of the optical-mechanical module provided in an embodiment of the present application;

[0057] Figure 6 for Figure 5 Distortion diagram of the provided optical-mechanical module;

[0058] Figure 7 for Figure 5 The MTF diagram of the optical-mechanical module provided;

[0059] Figure 8 for Figure 5 Relative illumination diagram of the provided optical engine module;

[0060] Figure 9 The third structural diagram of the optical-mechanical module provided in an embodiment of the present application;

[0061] Figure 10 for Figure 9 Distortion diagram of the provided optical-mechanical module;

[0062] Figure 11 for Figure 9 The MTF diagram of the optical-mechanical module provided;

[0063] Figure 12 for Figure 9 Relative illumination diagram of the provided optical engine module.

[0064] Description of reference numerals:

[0065] 1. Image source; 2. Xcube color-combining prism; 3. Projection lens; 301. First lens element; 302. Second lens element; 303. Third lens element; 304. Fourth lens element; 4. Front aperture. DETAILED DESCRIPTION

[0066] 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 arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0067] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0068] 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.

[0069] 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.

[0070] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0071] The optical machine module and optical projection device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0072] According to one embodiment of the present application, an optical-mechanical module is provided. Figure 1 、 Figure 5 and Figure 9 The optical machine module includes: a front aperture 4, a projection lens 3, an Xcube color combining prism 2, and an image source 1, which are arranged in sequence. The projection lens 3 includes four aspherical lenses, and the direction from the front aperture 4 to the Xcube color combining prism 2 is the first lens 301, the second lens 302, the third lens 303, and the fourth lens 304. The projection lens has positive optical power. The image source 1 includes red, green, and blue μLED panels for emitting red, green, and blue light, respectively. The Xcube color combining prism 2 is configured to combine the red, green, and blue light from the image source 1 to form a full-color image. The pixel size, angular resolution PPD, and diagonal field of view DFOV of the image source 1 meet the following conditions: 2.0≤Pixel Size×PPD×DFOV≤8.0.

[0073] The optical-mechanical module provided in this embodiment has a compact structure, with its main components working in tandem to achieve high-resolution, high-quality, full-color imaging, while also meeting the design requirements for miniaturization of the entire optical-mechanical module. The following is a detailed analysis of the structural composition of the optical-mechanical module provided in this embodiment and the functions of its main components.

[0074] The optical machine module provided in the embodiment of the present application includes a front aperture 4, see Figure 3 The front aperture 4 is located on the side of the optical machine module away from the image source 1, i.e., at the very front end of the entire optical machine module. The core function of the front aperture 4 is to limit the range of the light beam entering the projection lens 3. This design plays an important role in controlling aberrations and improving resolution of the optical machine module.

[0075] By adjusting the diameter parameters of the front aperture 4, it is possible to ensure that only light within a specific angle and range can smoothly enter the projection lens 3, thereby effectively optimizing the imaging quality and reducing unnecessary stray light interference.

[0076] In addition, the diameter design of the front aperture 4 needs to match the entrance pupil diameter of the external optical waveguide device. This matching design not only enhances the overall compatibility of the optical projection system, but also significantly improves the optical coupling efficiency, providing a strong guarantee for the efficient and stable operation of the optical machine module.

[0077] The optical machine module of the embodiment of the present application includes a projection lens 3, see Figure 1 、 Figure 5 and Figure 9 The projection lens 3 is primarily composed of four aspherical lenses arranged along the same optical axis. Specifically, starting from the side where the front aperture 4 is located and along the propagation path of the light toward the Xcube color-combining prism 2, a first lens 301, a second lens 302, a third lens 303, and a fourth lens 304 are arranged in sequence. The projection lens 3 is used to focus the divergent light from the image source 1, ultimately forming a clear and color-accurate image on the projection surface, providing an excellent visual experience for the AR device.

[0078] The projection lens 3 in the embodiment of the present application adopts a design scheme of four aspherical lenses. This design not only effectively reduces aberrations by precisely controlling the light propagation path, but also greatly improves the clarity and resolution of the image, thereby achieving excellent performance in high-resolution imaging. It is particularly worth mentioning that the present application achieves the effect of reducing aberrations by using only four lenses, which is a breakthrough in traditional design. At the same time, this streamlined lens configuration also greatly promotes the miniaturization process of the entire optical machine module, providing strong technical support for the compact design of AR devices.

[0079] The aspherical lens design used in this application can more precisely control the propagation path of light. Compared with traditional spherical lenses, it significantly reduces the number of required lenses while ensuring the same imaging quality. This improvement not only simplifies the overall structure but also effectively reduces the size of the optical module, meeting the demand for compact design of AR devices.

[0080] Furthermore, the production and processing of aspherical lenses relies on mold-based production technology, which greatly improves production efficiency and ensures product consistency. This mold-based production not only facilitates mass production but also effectively reduces production costs, significantly improving product competitiveness and laying the foundation for the widespread adoption and commercial application of AR devices.

[0081] In the optical machine module provided in the embodiment of the present application, the projection lens 3 has a positive optical focal length. This positive optical focal length configuration enables light to be effectively converged in the projection lens 3, further enhancing the imaging effect, such as improving the clarity and contrast of the image.

[0082] One of the core components of the optical machine module provided in the embodiment of the present application is the Xcube color combining prism 2. Its specific position and structure can be found in Figure 1 、 Figure 5 and Figure 9 In the optical design of this application, the Xcube color combining prism 2 is arranged between the projection lens 3 and the image source 1, and undertakes the key task of efficiently combining the red (R), green (G), and blue (B) light from the image source 1 to form a high-quality full-color image.

[0083] The Xcube color-combining prism 2, with its unique optical properties, ensures uniform mixing of red (R), green (G), and blue (B) light during the color-combining process, effectively avoiding chromatic aberration or color cast. This characteristic plays a crucial role in ensuring the color accuracy and clarity of the final output image, allowing users to immerse themselves in a more realistic visual experience. Through the color-combining processing of the Xcube color-combining prism 2, the optical engine module provided in the embodiments of this application achieves significant improvements in color performance, precisely meeting the user's demand for high-quality, full-color images.

[0084] The optical machine module provided in the embodiment of the present application further includes an image source 1, see Figure 1 、 Figure 5 and Figure 9 The image source 1 may include, for example, red, green, and blue μLED panels, configured to emit red, green, and blue light, respectively. The image source 1 is the imaging basis of the optical module provided in the embodiment of the present application. The three-color light emitted by the image source 1 is combined by the Xcube color combining prism 2 to form a full-color image.

[0085] It's worth noting that the three-color μLED panel used in Image Source 1 offers numerous significant advantages, including high brightness output, high contrast, and low power consumption. These advantages combine to enable Image Source 1 to deliver high-quality, highly stable image output, laying the foundation for improving the overall performance of the optical engine module.

[0086] In the optical-mechanical module design provided in this embodiment, the pixel size, angular resolution (PPD), and diagonal field of view (DFOV) of image source 1 satisfy the following relationship: 2.0 ≤ Pixel Size × PPD × DFOV ≤ 8.0. This parameter design ensures that the optical-mechanical module achieves high resolution, a compact size, and a large field of view (up to 40°). The following is a detailed analysis of this design.

[0087] Regarding the pixel size of image source 1: Pixel size is a fundamental parameter of image source 1, determining the physical size of each pixel. A smaller pixel size generally means higher pixel density, potentially leading to higher resolution. However, an excessively small pixel size can increase manufacturing difficulty and cost.

[0088] Regarding the angular resolution (PPD) of Image Source 1: Angular resolution is a key indicator of imaging clarity in an optomechanical module. It represents the number of pixels corresponding to the smallest angle that the human eye or optomechanical module can resolve. A higher PPD means more detail can be presented within the same field of view, thereby improving image quality.

[0089] Regarding the diagonal field of view (DFOV) of image source 1: The diagonal field of view (DFOV) is the maximum diagonal angle of the scene that the optical engine module can cover. A larger DFOV means the user can see a wider scene, thereby improving the user experience. However, increasing the field of view generally results in a decrease in resolution because light must be distributed over a larger area.

[0090] In the optical design provided in this application, by setting the relationship of Pixel Size × PPD × DFOV, this application ensures the high-resolution performance of the optical-mechanical module. Smaller pixel size and higher PPD help improve the clarity of imaging, allowing users to see more delicate image details. This relationship also takes into account the miniaturization requirements of the optical-mechanical module. By optimizing the balance between pixel size, PPD and DFOV, the volume of the optical-mechanical module can be reduced without sacrificing resolution. This is of great significance for application scenarios such as AR devices that have extremely demanding space requirements.

[0091] Although increasing the field of view usually results in a decrease in resolution, this application achieves a balance between a large field of view and high resolution by carefully designing the relationship between pixel size, PPD, and DFOV. The larger DFOV allows users to see a wider scene, while the high resolution ensures the clarity and detail of the scene.

[0092] Furthermore, this parameter design in this application not only improves the individual performance of the optical module in terms of resolution, volume, and field of view, but also achieves a comprehensive performance improvement through the synergy between them. Users can enjoy the broad field of view brought by the large field of view while also experiencing the delicate image effects brought by high resolution.

[0093] In summary, the optical-mechanical module design provided in the embodiments of this application achieves a balance between high resolution, compact size, and a large field of view by establishing a specific relationship between the image source's pixel size, angular resolution, and diagonal field of view. This design not only improves the overall performance of the optical-mechanical module but also provides users with a more premium and immersive visual experience.

[0094] The optical-mechanical module provided in the embodiments of the present application achieves significant technical effects through a carefully designed optical structure and optical parameter configuration, as described in detail as follows:

[0095] (1) High resolution and clear imaging: The projection lens 3 adopts a four-piece aspherical lens design, which can more effectively correct aberrations such as spherical aberration and coma compared to traditional spherical lenses, thereby significantly improving the clarity and resolution of the image.

[0096] (2) Positive optical power configuration: The projection lens 3 is configured to have positive optical power. This design helps to effectively focus the light within the projection lens 3, further improving the imaging quality.

[0097] (3) Relationship between Pixel Size, PPD, and DFOV: The pixel size, angular resolution, and diagonal field of view (FOV) of the image source 1 satisfy the relationship of 2.0 ≤ Pixel Size × PPD × DFOV ≤ 8.0. This design ensures high resolution while maintaining a large field of view and a small size, meeting user needs for a wide field of view and high-definition visual experience.

[0098] (4) Optimization of the number of lenses: By adopting a four - lens design, compared with traditional multi - lens systems, the number of lenses is effectively reduced, thus reducing the volume and weight of the optical - mechanical module. The use of aspherical lenses not only improves the imaging quality but also, due to its unique curved - surface design, helps to achieve more efficient light control in a limited space, further promoting the miniaturization of the optical - mechanical module. This application realizes aberration reduction with the fewest lenses, high - resolution imaging, and miniaturization of the module volume.

[0099] (5) Xcube color - combining prism 2: The Xcube color - combining prism 2 is configured to combine the red (R), green (G), and blue (B) light rays from the image source 1 to form a high - quality full - color image. This color - combining method effectively reduces color distortion and improves the accuracy of color reproduction.

[0100] The design of the optical - mechanical module provided in the embodiments of this application is not only applicable to portable devices such as AR smart glasses but can also be extended according to requirements and applied to a wider range of AR display fields.

[0101] In summary, through new optical - structure designs and optical - parameter configurations, the optical - mechanical module of the embodiments of this application achieves technical effects in multiple aspects such as high - resolution imaging, module miniaturization, efficient color - combining and color reproduction, and optical - performance optimization, providing strong technical support for the development of AR devices.

[0102] In some examples of this application, the total focal length f of the optical - mechanical module, the length L of the Xcube color - combining prism 2 along the optical axis direction, and the air gap G between the Xcube color - combining prism 2 and the image source 1 satisfy the following relationship: 0.2mm < f - L - G < 2mm.

[0103] In some examples provided by this application, the total focal length f of the optical - mechanical module, the length L of the Xcube color - combining prism 2 along the optical axis direction, and the air gap G between the Xcube color - combining prism 2 and the image source 1 satisfy a specific relational formula: 0.2mm < f - L - G < 2mm. By precisely controlling the range of f - L - G, it ensures a balance among the total focal length f of the optical - mechanical module, the length L of the Xcube color - combining prism 2, and the air gap G between the Xcube color - combining prism 2 and the image source 1. This balance is crucial for achieving the extreme miniaturization of the optical - mechanical module while maintaining high - resolution imaging. The following is a detailed explanation of the parameters and a detailed analysis of this specific relational formula.

[0104] The definitions of some parameters in this example of this application are as follows:

[0105] f represents the total focal length of the optical - mechanical module, which determines the ability of light rays to converge, that is, the clarity and focusing effect of imaging.

[0106] L represents the length of the Xcube color combining prism 2 along the optical axis, which reflects the physical size of the Xcube color combining prism 2 and has a direct impact on the color combining and propagation path of light.

[0107] G represents the air gap between the Xcube color combining prism 2 and the image source 1 in the direction of the optical axis, which affects the propagation path of light between the Xcube color combining prism 2 and the image source 1, thereby affecting the imaging quality.

[0108] By optimizing the relationship between f, L, and G, the overall length of the optical machine module can be effectively reduced, thereby achieving a miniaturized design of the optical machine module. This miniaturized design not only helps improve the portability of AR devices, but also significantly improves the user experience, making it easier for users to use the device.

[0109] The specific relationship provided in the examples of this application ensures that light, after passing through the Xcube color-combining prism 2 and the air gap G, can be accurately converged onto the projection surface while maintaining high-resolution imaging. High-resolution imaging is crucial for AR devices because it provides a clearer, more realistic visual experience, enhancing the user's sense of immersion and realism.

[0110] It should be noted that if the fLG value is not within the range of 0.2mm to 2mm, it may cause a series of problems. Specifically:

[0111] If fLG≤0.2mm: the total focal length f of the optical machine module may be too short, resulting in the inability of light to effectively converge at one point during propagation, thereby affecting the clarity and resolution of the image.

[0112] If the length L and the air gap G of the Xcube color combining prism 2 are too large due to improper parameter adjustment, the light will deviate from the expected path during propagation, increase aberrations, and affect the accuracy and stability of imaging.

[0113] In addition, an overly compact structural design may pose great challenges to the manufacturing and assembly of the optical-mechanical module, increasing production costs and difficulty.

[0114] If fLG≥2mm: the total focal length f of the optical machine module may be too long, resulting in a significant increase in the overall length of the optical machine module, which is contrary to the development trend of miniaturization of AR devices.

[0115] If the length L and the air gap G of the Xcube color combining prism 2 are too small due to improper parameter adjustment, it may cause unnecessary interference or scattering of light during propagation, further reducing the imaging quality.

[0116] An overly long optical engine module may not only increase the overall weight and volume of the AR device, but also affect the user's wearing comfort and usage experience.

[0117] In summary, the relational expression 0.2mm < f - L - G < 2mm provided in this example of the present application is of crucial significance for ensuring the miniaturization and high-resolution imaging of the optical engine module. By precisely controlling the relationship between these parameters, it is possible to ensure that the entire optical engine module reaches an optimal balance between optical performance and physical size, thereby providing users with a better-quality and more convenient visual experience.

[0118] In some examples of the present application, the optical engine module satisfies the following relationship:

[0119] 2 ≤ Panel Size + G * tan(arcsin1 / 2F # ) + L * tan{arcsin[sin(arcsin1 / 2F # )] / n dcube} ≤ 5; where: Panel Size is the diagonal size of the image source 1, and 0.1 inch ≤ Panel Size ≤ 0.3 inch; G is the air gap between the Xcube color-combining prism 2 and the image source 1; L is the length of the Xcube color-combining prism 2 along the optical axis direction; F # is the aperture number of the optical engine module, and 1 ≤ F # ≤ 3; n dcube is the refractive index of the Xcube color-combining prism 2.

[0120] According to this example provided by the present application, a specific relational expression constraints the overall optical design of the optical engine module by comprehensively considering multiple factors such as the diagonal size Panel Size of the image source 1, the air gap G in the optical axis direction between the Xcube color-combining prism 2 and the image source 1, the length L of the Xcube color-combining prism 2 along the optical axis direction, the aperture number F [[ID=​​​​​The various parameter settings in the specific relationship provided in this example of the present application fully take into account the requirements of imaging quality. For example, the range of the diagonal size Panel Size of the image source 1 ensures that the image source 1 has sufficient pixel density to support high-resolution imaging. The range limit of the aperture number F# ensures that the optical machine module has sufficient luminous flux output to meet the brightness requirements of the AR optical machine, and also helps to control aberrations and improve imaging clarity. By controlling the relationship between these parameters, it can be ensured that light can be accurately converged on the projection imaging surface, thereby maintaining a high-resolution imaging effect.

[0122] The specific relationship in this example is crucial for miniaturizing the optical-mechanical module and ensuring high-resolution imaging. By controlling the relationship between these parameters, the optical-mechanical module achieves an optimal balance between performance and size, providing users with a superior and more convenient visual experience.

[0123] If Panel Size+G*tan(arcsin1 / 2F # )+L*tan{arcsin[sin(arcsin1 / 2F # )] / n dcube If the PanelSize of image source 1 is less than the minimum value allowed by the specific relationship, for example, the PanelSize of image source 1 may be too small. If the PanelSize of image source 1 is less than the minimum value allowed by the specific relationship, while the entire optical machine module may be miniaturized to some extent, it will result in insufficient pixel density, thereby reducing the resolution and clarity of the image. For AR devices, low-resolution images will seriously affect the user experience and fail to provide clear visual effects.

[0124] Another possibility is that the air gap G between the Xcube color-combining prism 2 and the image source 1, or the length L of the Xcube color-combining prism 2 along the optical axis, is too small. This can cause unnecessary interference or scattering of light during propagation. If the air gap G is too small, light may not propagate effectively, increasing crosstalk between optical components and reducing image quality. Furthermore, if the length L of the Xcube color-combining prism 2 along the optical axis is too small, the color combination effect may be affected, resulting in color distortion or reduced uniformity.

[0125] When Panel Size+G*tan(arcsin1 / 2F # )+L*tan{arcsin[sin(arcsin1 / 2F # )] / n dcube When} is less than 2, the optical-mechanical module may not be able to meet the requirements of high-resolution imaging. At the same time, the miniaturization of the module may be difficult to achieve due to its overly compact structure, which increases the difficulty and cost of manufacturing and assembly.

[0126] If Panel Size+G*tan(arcsin1 / 2F # )+L*tan{arcsin[sin(arcsin1 / 2F # )] / n dcube If the image source size is larger than 5, the panel size of the image source 1 may be too large. Although this can provide a higher pixel density, it will increase the overall size of the optical engine module, hindering miniaturization. A larger image source size may increase the overall weight and volume of the AR device.

[0127] Another possibility is that the air gap G between the Xcube color-combining prism 2 and the image source 1, or the length L of the Xcube color-combining prism 2 along the optical axis, is too large. This can cause light to deviate from its intended path during propagation, increasing aberrations and chromatic aberrations, and reducing imaging accuracy and stability. For example, a larger air gap G and prism length L can increase the overall length of the optical-mechanical module, hindering miniaturization.

[0128] When Panel Size+G*tan(arcsin1 / 2F # )+L*tan{arcsin[sin(arcsin1 / 2F # )] / n dcube When}>5, the optical machine module may be too large to meet the portability and miniaturization requirements of the AR device.

[0129] In general, the parameter range designed in this example of this application (i.e., 2 to 5) ensures that the optical-mechanical module achieves a miniaturized design while maintaining high-resolution imaging. If the parameters are not within this range, it will have an adverse effect on the performance and size of the optical-mechanical module, thereby affecting the overall performance and user experience of the AR device. Therefore, when designing the optical-mechanical module, the mathematical relationship in this example of this application must be followed to ensure that the optical-mechanical module achieves the best balance between performance and size.

[0130] In some examples of this application, the aperture number F of the optical machine module is # Satisfy: 1≤F # ≤3, and the aperture number F # The ratio of the total focal length f of the optical machine module satisfies: 0.5≤F# / f≤5.

[0131] In some examples of this application, the aperture number F of the optical machine module is # The ratio of the focal length to the total focal length f is controlled within a specific range, that is: 1≤F #≤3, 0.5≤F # / f≤5. This optical design aims to optimize the contrast, stray light performance, optical efficiency and luminous flux output of the optical-mechanical module.

[0132] Aperture number F # It is an important parameter of the optical module, which determines the amount of light passing through, that is, the luminous flux. In the example provided in this application, the aperture number F of the optical module is # Being controlled between 1 and 3 means that the optical module has a moderate aperture size. A moderate aperture size helps balance the amount of light entering the optical module and the depth of field, ensuring clear imaging at different distances.

[0133] And F # The ratio of / f further refines the aperture number F. # Specifically, F # The ratio of / f is between 0.5 and 5, which means that the aperture number F of the optical module is # A certain proportional relationship needs to be maintained between the total focal length f of the optical machine module. This proportional relationship helps to optimize the optical performance of the optical machine, such as contrast, stray light suppression, etc. In this application, by adjusting the aperture number F of the optical machine module # The ratio of the focal length f to the total focal length of the optical machine module can ensure that the optical machine module can maintain stable performance under different working conditions.

[0134] By limiting the aperture number F # The range and F # The ratio of / f ensures that the optical module provided by the embodiments of the present application has sufficient contrast. Contrast is one of the important indicators for measuring imaging quality. It determines the degree of difference between bright and dark areas in the image. High contrast helps improve image clarity and layering, enabling AR devices to present more realistic visual effects.

[0135] Appropriate aperture number and reasonable F # / f ratio helps to suppress the generation of stray light. Stray light refers to the interference light formed when non-imaging light enters the optical module, which will reduce the clarity and contrast of the image. In this application, by optimizing the aperture number F of the optical module # and aperture number F # The ratio of f to the total focal length of the module can reduce the interference of stray light and improve the imaging quality of the optical machine module.

[0136] The aperture number F of the optical machine module #The choice of F directly affects the efficiency of the optical module. For the optical module provided in the embodiment of the present application, a suitable aperture size can ensure that the optical module has a high optical efficiency when receiving light and reduce the loss of light. At the same time, a reasonable F # The / f ratio also helps to optimize the optical performance of the optomechanical module and further improve the optical efficiency of the optomechanical module.

[0137] By ensuring the efficiency and luminous flux output of the optical module, we can ensure that the AR optical machine has sufficient brightness. Brightness is one of the important performance indicators of AR devices, which directly affects the user's visual experience during use.

[0138] In summary, in this application, by limiting the aperture number F of the optical machine module # By optimizing the ratio of α to the total focal length f, the optical module's contrast, stray light performance, optical efficiency, and luminous flux output are optimized. This design helps improve the overall performance of AR devices and provide users with a better visual experience.

[0139] In some examples of the present application, the pixel size of the image source 1 is 1.5 μm ≤ PixelSize ≤ 8 μm.

[0140] In some examples of the present application, the pixel size of the image source 1 is controlled within the range of 1.5 μm to 8 μm. This design is based on the consideration of the imaging quality requirements of the optical-mechanical module, especially the modulation transfer function (MTF), a key evaluation indicator.

[0141] MTF (Modulation Transfer Function) is an important indicator for measuring the imaging clarity of an optical system. It reflects the optical system's ability to transmit signals of different spatial frequencies.

[0142] In the optical-mechanical module provided in the embodiment of the present application, a high MTF value means that the optical-mechanical module can more accurately transmit image details, thereby presenting a clearer and more realistic visual effect.

[0143] The MTF metric is evaluated based on the Nyquist frequency, which is inversely proportional to pixel size (Nyquist frequency = 1 / (2*Pixel Size)). This means that the smaller the pixel size, the higher the Nyquist frequency, the more image detail the optical engine module can deliver, and the higher the MTF value.

[0144] In the examples provided in this application, the pixel size is limited to the range of 1.5μm to 8μm based on a comprehensive consideration of multiple factors such as the performance, cost, and manufacturing process of the optical module. Specifically, a smaller pixel size helps to improve the MTF value, but may increase the difficulty and cost of manufacturing; a larger pixel size may reduce the MTF value, but is relatively easy to manufacture and has a lower cost. Therefore, the selection of a pixel size range of 1.5μm to 8μm takes into account the acceptability of the manufacturing process and cost while ensuring imaging quality.

[0145] By limiting the pixel size, the design of this application can ensure that the AR optical machine has a higher MTF value, thereby improving imaging clarity. This enables AR devices to more accurately convey details when presenting images, reduce blur and distortion, and provide users with a clearer and more realistic visual experience. The appropriate choice of pixel size helps to optimize the overall performance of the optical machine module. It can reduce the complexity and manufacturing cost of the optical machine module while ensuring imaging quality, and improve the reliability and stability of the optical machine module. The design of this application provides strong support for the development of AR technology.

[0146] In some examples of the present application, the effective focal lengths of the four aspherical lenses in the projection lens satisfy the relationship: 0.1<(f1+f4) / (f2+f3)<0.3, where: f1 is the effective focal length of the first lens 301; f2 is the effective focal length of the second lens 302; f3 is the effective focal length of the third lens 303; f4 is the effective focal length of the fourth lens 304; and the first lens 301 and the fourth lens 304 are double convex lenses; the second lens 302 and the third lens 303 are meniscus lenses.

[0147] In some examples of this application, the effective focal lengths of the four aspherical lenses in the projection lens satisfy the relationship: 0.1 < (f1 + f4) / (f2 + f3) < 0.3. This design is based on considerations for optimizing the overall performance of the optical-mechanical module, specifically focusing on imaging aberrations, resolution, Nyquist frequency, and module size.

[0148] For the projection lens 3 in this application, by constraining the relationship between the effective focal lengths of the four lenses, it is possible to ensure that the positive and negative lenses are evenly matched in the optical engine module. This even matching helps balance the refraction and deflection of light as it passes through each lens, thereby reducing imaging aberrations.

[0149] Regarding the surface shapes of the four lenses provided in this example of this application:

[0150] The first lens 301 and the fourth lens 304 are biconvex lenses, and the second lens 302 and the third lens 303 are meniscus lenses.

[0151] The first lens 301 and the second lens 302 have positive optical power, the third lens 303 has negative optical power, and the fourth lens 304 has positive optical power. This distribution of optical power facilitates the proper propagation and focusing of light within the projection lens 3, further reducing aberrations and improving image quality.

[0152] By satisfying the focal length relationship of 0.1 < (f1 + f4) / (f2 + f3) < 0.3, high-resolution, high-Nyquist frequency imaging can be achieved while reducing the size of the optical module. High-resolution imaging means richer image details, while a high Nyquist frequency ensures image clarity in high-frequency regions. Reducing the size of the optical module helps improve the portability and user experience of AR devices.

[0153] If the effective focal length relationship of the four aspherical lenses in the projection lens 3 does not satisfy 0.1<(f1+f4) / (f2+f3)<0.3, it will have an adverse effect on the performance of the optical machine module. Specifically, the uneven matching of positive and negative lenses will lead to an imbalance in the refraction and deflection of light when passing through each lens, thereby increasing the imaging aberration. The increase in aberration will reduce the clarity and contrast of the image, affecting the user's visual experience. The non-satisfaction of the focal length relationship will also affect the reasonable propagation and focusing of light in the projection lens 3, resulting in a decrease in resolution and Nyquist frequency, which will cause the image details to be lost and the high-frequency area to become blurred, which cannot meet the AR device's demand for high-quality imaging. In addition, in order to compensate for the performance degradation caused by the non-satisfaction of the focal length relationship, it is generally necessary to increase the number or size of the lenses, which leads to an increase in the volume of the optical machine module.

[0154] In summary, the effective focal length relationship of the four aspherical lenses in projection lens 3, 0.1 < (f1 + f4) / (f2 + f3) < 0.3, plays a crucial role in the design of this application. It ensures optimized performance of the optical-mechanical module, enabling high-resolution, high-Nyquist-frequency imaging while reducing the size of the module.

[0155] In some examples of the present application, the effective focal length of each lens in the projection lens and the total focal length f of the optical machine module satisfy the following relationship: 0.7<f1 / f<1, 5.9<f2 / f<10.3, -0.5<f3 / f<-0.3 and 0.5<f4 / f<0.6; wherein f1 is the effective focal length of the first lens 301, f2 is the effective focal length of the second lens 302, f3 is the effective focal length of the third lens 303, and f4 is the effective focal length of the fourth lens 304.

[0156] In the example provided in this application, the proportional relationship between the effective focal length of each lens in the projection lens 3 (the first lens 301, the second lens 302, the third lens 303, and the fourth lens 304) and the total focal length f of the optical engine module is described. Specifically:

[0157] The ratio of the effective focal length f1 of the first lens 301 to the total focal length f of the optical machine module should satisfy 0.7<f1 / f<1.

[0158] The ratio of the effective focal length f2 of the second lens 302 to the total focal length f of the optical engine module should satisfy 5.9<f2 / f<10.3.

[0159] The ratio of the effective focal length f3 of the third lens 303 to the total focal length f of the optical machine module should satisfy -0.5<f3 / f<-0.3.

[0160] The ratio of the effective focal length f4 of the fourth lens 304 to the total focal length f of the optical engine module should satisfy 0.5<f4 / f<0.6.

[0161] These proportional relationships ensure uniform distribution of optical power across all lenses in the optical machine module, which is key to achieving high-resolution imaging and reducing tolerance sensitivity.

[0162] Specifically, by precisely controlling the ratio of the effective focal length of each lens element in the projection lens 3 to the total focal length f of the optical engine module, it is possible to ensure an optimal balance between the refraction and deflection of light as it passes through each lens element, thereby achieving uniform distribution of optical power. This uniform distribution helps reduce light loss and distortion during propagation, improving light utilization and image quality.

[0163] Aberration is a key factor affecting image quality. By optimizing the optical power distribution of each lens in the projection lens 3, aberrations such as spherical aberration, coma, and astigmatism can be effectively controlled. Reducing aberrations means that image details can be more accurately captured and presented, thus achieving high-resolution imaging. This is crucial for AR devices, as users demand a clear and realistic visual experience.

[0164] It can be seen that by precisely controlling the ratio of the effective focal length of each lens in the projection lens 3 to the total focal length f of the optical machine module, the overall performance of the optical machine module can be optimized, providing a clear and realistic visual experience for the AR device.

[0165] In some examples of the present application, the first lens 301 and the second lens 302 have positive optical power, the third lens 303 has negative optical power, and the fourth lens 304 has positive optical power; the effective focal length f1 of the first lens 301, the effective focal length f2 of the second lens 302, the effective focal length f3 of the third lens 303 and the effective focal length f4 of the fourth lens 304 satisfy the following relationship with the total focal length f of the optical machine module: 0.7<f1 / f<1, 5.9<f2 / f<10.3, -0.5<f3 / f<-0.3, 0.5<f4 / f<0.6.

[0166] In some examples of the present application, the effective focal lengths of the four lenses in the projection lens 3 are set within specific ranges: the effective focal length f1 of the first lens 301 is 4mm < f1 < 6mm, the effective focal length f2 of the second lens 302 is 33mm < f2 < 58mm, the effective focal length f3 of the third lens 303 is -3mm < f3 < -2mm, and the effective focal length f4 of the fourth lens 304 is 3mm < f4 < 4mm. These focal length ranges were selected based on a comprehensive consideration of optical performance, structural compactness, and mass production feasibility.

[0167] By precisely setting the effective focal length of each lens in the projection lens 3 , the present application can optimize the optical performance of the projection lens 3 , including aberration correction, chromatic aberration control, and imaging clarity.

[0168] The first lens 301 and the second lens 302 act as positive-power lenses, responsible for the initial convergence and correction of light; the third lens 303 acts as a negative-power lens, used to further correct aberrations; and the fourth lens 304 acts as a positive-power lens, contributing to the final convergence and imaging of light. The rational distribution of the focal lengths of the lenses helps achieve a compact structure for the projection lens 3. By avoiding an unnecessary number of lenses and complex lens shapes, the present application can reduce the volume and weight of the projection lens 3 while maintaining optical performance, thereby meeting the requirements of AR devices for miniaturization and lightweighting.

[0169] In this application, the effective focal length of each lens element in the projection lens 3 is set with mass production feasibility in mind. By selecting a focal length range that is easy to process and mass produce, this application can reduce lens production costs, improve production efficiency, and ensure product consistency and reliability. This is of great significance for the application of the technical solution of this application to large-scale production.

[0170] The optimized projection lens 3 can provide higher-quality imaging, including higher resolution, more accurate color reproduction, and lower aberration. This will directly enhance the user's visual experience when using AR devices, allowing them to enjoy clearer and more realistic images.

[0171] In some examples of the present application, the total optical length of the optical engine module is L', which satisfies the following conditions: 0.7<(f1+f4) / L'<1.1, and 3.7<(f2+f3) / L'<6.8.

[0172] By implementing these two conditions, the present application ensures uniform optical power distribution across the four lenses in the optical engine module. This uniform distribution helps reduce aberrations and improve image quality. In particular, when light passes through multiple lenses, uniform optical power distribution ensures a more stable and accurate light transmission, thereby reducing distortion and chromatic aberration.

[0173] These two conditions also facilitate the miniaturization of AR optical engines. By precisely controlling the ratio of lens power to total optical length, the size and weight of the lenses can be reduced while maintaining image quality. This helps reduce the volume of the entire optical engine module, making it more suitable for space-critical applications such as AR glasses.

[0174] Uniform optical power distribution and a compact optical design optimize the imaging performance of the optomechanical module. In AR applications, users demand clear images. This application ensures high-quality imaging by precisely controlling the optical power and overall optical length of the lenses.

[0175] In some examples of the present application, the air gap between the first lens 301 and the second lens 302 is A1, the air gap between the second lens 302 and the third lens 303 is A2, the air gap between the third lens 303 and the fourth lens 304 is A3, and the air gap between the fourth lens 304 and the Xcube color combining prism 2 is A4. Then, the air gaps A1, A2, A3, and A4 satisfy the relationship: 0.7<(A1+A4) / (A2+A3)<0.9.

[0176] In some examples of the present application, the four air gaps in the projection lens 3—the air gap A1 between the first lens 301 and the second lens 302, the air gap A2 between the second lens 302 and the third lens 303, the air gap A3 between the third lens 303 and the fourth lens 304, and the air gap A4 between the fourth lens 304 and the Xcube color-combining prism 2—are designed to satisfy a specific ratio: 0.7 < (A1 + A4) / (A2 + A3) < 0.9. This design is based on a comprehensive consideration of the performance, compactness, and production feasibility of the optical engine module.

[0177] By properly setting the ratio of the air gaps A1, A2, A3, and A4, the present application can optimize the overall structural design of the projection lens 3. This air gap setting helps to ensure the relative position stability between the lenses and reduce optical performance fluctuations caused by structural unevenness.

[0178] The uniform setting of the air gap also helps reduce the sensitivity of the optical-mechanical module to manufacturing tolerances. During the production process, small dimensional deviations can have a significant impact on optical performance. However, by following the air gap ratio relationship provided in this example, these deviations can be offset to a certain extent, ensuring that the performance of the optical-mechanical module remains consistent across different production batches.

[0179] By optimizing the spacing between lenses, unnecessary space occupation can be reduced while ensuring optical performance, making the optical machine module more compact and lightweight.

[0180] Furthermore, proper air gap settings can help improve the imaging quality of the optical-mechanical module. By ensuring that light undergoes proper spatial adjustment during propagation, optical issues such as aberration and chromatic aberration can be reduced, thereby improving image clarity and color accuracy. This is crucial for delivering high-quality, realistic virtual images.

[0181] In some examples of the present application, the total optical length of the optical engine module is L', which satisfies the following conditions: 0.1<(A1+A4) / L'<0.2, and 0.1<(A2+A3) / L'<0.2.

[0182] In some examples of this application, the total optical length of the optical machine module is L'. Regarding the proportional relationship between the air gaps A1 (the air gap between the first lens 301 and the second lens 302), A2 (the air gap between the second lens 302 and the third lens 303), A3 (the air gap between the third lens 303 and the fourth lens 304), and A4 (the air gap between the fourth lens 304 and the Xcube color-combining prism 2) and the total optical length L', two conditions are proposed: 0.1 < (A1 + A4) / L' < 0.2 and 0.1 < (A2 + A3) / L' < 0.2. These two conditions are intended to achieve a miniaturized design of the optical machine module by optimizing the proportion of air gaps in the total optical length.

[0183] Specifically, this control minimizes the air gap while maintaining optical performance, thereby reducing the size of the optomechanical module. Miniaturizing the optomechanical module not only helps improve device integration, enabling more functions within a limited space, but also makes the device easier to carry and use. This allows users to more easily wear AR devices and enjoy a more comfortable visual experience.

[0184] In some examples of the present application, the total optical length L' of the optical machine module and the image height H of the image source 1 satisfy the following relationship: 0.4<H / L'<0.5.

[0185] In some examples of this application, a specific ratio is set between the total optical length L' of the optomechanical module and the image height H of the image source 1: 0.4 < H / L' < 0.5. This design constraint is based on the need for miniaturization of the optomechanical module. By optimizing the ratio between the total optical length L' and the image height H, the optomechanical module is minimized, thereby achieving miniaturization.

[0186] By setting the ratio of 0.4<H / L'<0.5, the present application ensures the optimal balance between the total optical length L' of the optical machine module and the image height H of the image source 1. This design allows the optical machine module to shorten its overall length as much as possible while maintaining the necessary imaging performance, thereby achieving the shortest optical machine design. The shortest optical machine design directly leads to the miniaturization of the optical machine module. The miniaturized optical machine module is not only easy to integrate into various AR devices, but also improves the wearing comfort of the device.

[0187] By optimizing the ratio between the total optical length L' and the image height H, we can reduce light loss and distortion during propagation, improving imaging clarity and accuracy. At the same time, the compact structural design reduces unnecessary space occupation and improves the space utilization of the optical machine module.

[0188] In some examples of the present application, the imaging distance of the optical machine module is infinity, the exit pupil distance of the front aperture 4 is 0≤exit pupil distance<150mm, and the exit pupil distance is the distance along the optical axis from the surface of the front aperture 4 close to the image source 1 to the surface of the first lens 301 away from the image source 1.

[0189] In some examples of the present application, the design of the optical-mechanical module takes into account its characteristics as an optical waveguide image source, which are specifically reflected in two aspects: imaging distance and exit pupil distance of the front aperture 4.

[0190] The imaging distance of the optical-mechanical module is infinite, which matches the optical properties of the optical waveguide, thereby ensuring that the light emitted from the optical-mechanical module can smoothly enter and propagate along the optical waveguide.

[0191] The pupil distance of the front aperture 4 is precisely controlled within the range of 0≤exit pupil distance<150 mm. This distance refers to the distance along the optical axis from the surface of the front aperture 4 close to the image source 1 to the surface of the first lens 301 away from the image source 1.

[0192] When the pupil distance is 0, the optical engine module can be directly attached to the optical waveguide device, achieving a compact integrated design. The pupil distance limit of less than 150mm takes into account the actual situation of placing the optical engine module on the temple of AR glasses, ensuring that the optical engine module can function normally within the limited space.

[0193] A reasonable exit pupil distance design helps improve the wearing comfort and visual experience of AR glasses. Users can adjust the wearing method of AR glasses according to their needs without worrying about the image quality being affected by improper installation of the optical module.

[0194] By setting the parameter ranges of imaging distance and exit pupil distance, the optical-mechanical module design of this application has greater versatility and compatibility. It can be matched with different types of optical waveguides and AR glasses to meet the needs of different users and application scenarios.

[0195] In some examples of the present application, the fourth lens 304 is made of optical glass material.

[0196] In some examples of this application, the fourth lens 304 is made of optical glass. This design is based on considerations of the overall performance and reliability of the optical engine module, particularly the position of the fourth lens 304 in the optical path and its proximity to the image source 1 (heat source).

[0197] Optical glass materials have excellent high-temperature resistance and can maintain stable physical and chemical properties in high-temperature environments. Because the fourth lens element 304 is located near the image source 1 (i.e., the heat source), the use of optical glass can effectively resist the heat generated by the heat source, preventing lens deformation or performance degradation due to excessive temperatures, thereby improving the overall temperature resistance of the optical engine module.

[0198] The stability and durability of optical glass materials enable the fourth lens 304 to maintain stable imaging performance during long-term use. This helps reduce image quality degradation or optical-mechanical failures caused by lens aging or damage, thereby enhancing the overall reliability of the optical-mechanical module.

[0199] Optical glass materials offer excellent optical properties, such as high transmittance and low dispersion, which contribute to optimizing the imaging quality of optical modules. The fourth lens element 304, a crucial component of the optical path, is constructed from optical glass to ensure the stability and accuracy of light during propagation, reducing aberrations and distortion, and improving image clarity and color accuracy.

[0200] Furthermore, optical glass materials are highly mature and reliable in production and processing. Using optical glass to manufacture the fourth lens element 304 can fully utilize existing production processes and equipment, reducing production costs and cycle times. Furthermore, the stability and consistency of optical glass materials also help improve production efficiency and product quality.

[0201] The optical-mechanical module of the present application is described below through Examples 1 to 3.

[0202] Example 1

[0203] See also Figure 1 The optical machine module provided in this embodiment 1 includes: a front aperture 4, a projection lens 3, an Xcube color combining prism 2, and an image source 1, which are arranged in sequence; wherein the projection lens 3 includes four aspherical lenses, and the first lens 301, the second lens 302, the third lens 303, and the fourth lens 304 are arranged in sequence from the front aperture 4 to the Xcube color combining prism 2; the projection lens has positive optical power; the image source 1 includes red, green, and blue μLED panels for emitting red, green, and blue light, respectively; the Xcube color combining prism 2 is configured to combine the red, green, and blue light from the image source 1 to form a full-color image;

[0204] The image source 1 is based on a 600*800*2.5μm μLED panel, with an image height H of 2.5mm and a FOV of 25°.

[0205] The optical total length L' of the optical machine module is 8.2 mm, the entrance pupil diameter is 3.5 mm, and the aperture number F of the optical machine module is # =1.6, the total focal length f of the optical machine module is 5.6 mm;

[0206] The wavelength of the light generated by the image source 1 is set to 463:528:650nm=1:2:1;

[0207] Among them, Pixel Size×PPD×DFOV is 2.51mm.

[0208] Figure 1 The specific parameters of the optical machine module are shown in Table 1 below, which include the curvature radius, thickness, glass material, and semi-aperture of the lens.

[0209] Table 1

[0210]

[0211] The optical performance of the optical machine module provided in the above embodiment 1 is as follows:

[0212] See also Figure 2 , Figure 2 This is a distortion diagram of the optical machine module. The absolute value of the distortion of the optical machine module is less than 1%, which can greatly improve the imaging quality.

[0213] See also Figure 3 , Figure 3 This is the MTF diagram of the optical machine module. The average MTF of each field of view is greater than 0.6 @ 200lp / mm (Nyquist frequency), and the imaging is good.

[0214] See also Figure 4 , Figure 4 This is the relative illumination diagram of the optical machine module. The illumination at the outermost edge relative to the center is greater than 85%, which is beneficial to improving the uniformity of the optical machine.

[0215] Example 2

[0216] See also Figure 5 The optical machine module provided in this embodiment 2 includes: a front aperture 4, a projection lens 3, an Xcube color combining prism 2, and an image source 1, which are arranged in sequence; wherein the projection lens 3 includes four aspherical lenses, and the first lens 301, the second lens 302, the third lens 303, and the fourth lens 304 are arranged in sequence from the front aperture 4 to the Xcube color combining prism 2; the projection lens has positive optical power; the image source 1 includes red, green, and blue μLED panels for emitting red, green, and blue light, respectively; the Xcube color combining prism 2 is configured to combine the red, green, and blue light from the image source 1 to form a full-color image;

[0217] The image source 1 is based on a 600*800*2.5μm μLED panel, with an image height H of 2.5mm and a FOV of 25°.

[0218] The optical total length L' of the optical machine module is 8.2 mm, the entrance pupil diameter is 3.5 mm, and the aperture number F of the optical machine module is # =1.59, the total focal length f of the optical machine module is 5.6 mm;

[0219] The wavelength of the light generated by the image source 1 is set to 463:528:650nm=1:2:1;

[0220] Among them, Pixel Size×PPD×DFOV is 2.56mm.

[0221] Figure 5 The specific parameters of the optical machine module are shown in Table 2 below, which include the curvature radius, thickness, glass material, and semi-aperture of the lens.

[0222] Table 2

[0223]

[0224] The optical performance of the optical-mechanical module provided in the above embodiment 2 is as follows:

[0225] See also Figure 6 , Figure 6 This is a distortion diagram of the optical machine module. The absolute value of the distortion of the optical machine module is less than 0.8%, which can greatly improve the imaging quality.

[0226] See also Figure 7 , Figure 7 This is the MTF diagram of the optical machine module. The average MTF of each field of view is greater than 0.6 @ 200lp / mm (Nyquist frequency), and the imaging is good.

[0227] See also Figure 8 , Figure 8 This is the relative illumination diagram of the optical machine module. The illumination at the outermost edge relative to the center is greater than 86%, which is beneficial to improving the uniformity of the optical machine.

[0228] Example 3

[0229] See also Figure 9 The optical engine module provided in this embodiment 3 includes: a front aperture 4, a projection lens 3, an Xcube color combining prism 2, and an image source 1, which are arranged in sequence; wherein the projection lens 3 includes four aspherical lenses, and the first lens 301, the second lens 302, the third lens 303, and the fourth lens 304 are arranged in sequence from the front aperture 4 to the Xcube color combining prism 2; the projection lens has positive optical power; the image source 1 includes red, green, and blue μLED panels for emitting red, green, and blue light, respectively; the Xcube color combining prism 2 is configured to combine the red, green, and blue light from the image source 1 to form a full-color image;

[0230] The image source 1 is based on a 600*800*2.5μm μLED panel, with an image height H of 2.5mm and a FOV of 25°.

[0231] The optical total length L' of the optical machine module is 8.2 mm, the entrance pupil diameter is 3.5 mm, and the aperture number F of the optical machine module is # =1.59, the total focal length f of the optical machine module is 5.7 mm;

[0232] The wavelength of the light generated by the image source 1 is set to 463:528:650nm=1:2:1;

[0233] Among them, Pixel Size×PPD×DFOV is 2.51mm.

[0234] Figure 9 The specific parameters of the optical machine module are shown in Table 3 below, which include the curvature radius, thickness, glass material, and semi-aperture of the lens.

[0235] Table 3

[0236]

[0237] The optical performance of the optical-mechanical module provided in the third embodiment is as follows:

[0238] See also Figure 10 , Figure 10 Distortion diagram of the optical-mechanical module. The absolute value of the distortion of the optical-mechanical module is less than 0.8%, which can greatly improve the imaging quality.

[0239] See also Figure 11 , Figure 11 This is the MTF diagram of the optical machine module. The average MTF of each field of view is greater than 0.6 @ 200lp / mm (Nyquist frequency), and the imaging is good.

[0240] See also Figure 12 , Figure 12 This is the relative illumination diagram of the optical machine module. The illumination at the outermost edge relative to the center is greater than 86%, which is beneficial to improving the uniformity of the optical machine.

[0241] According to another embodiment of the present application, an optical projection device is provided, which includes: the optical-mechanical module and the optical waveguide device as described above; wherein the diameter of the front aperture 4 of the optical-mechanical module matches the entrance pupil diameter of the optical waveguide device.

[0242] The specific implementation of the optical projection device of the embodiment of the present application can refer to the various embodiments of the above-mentioned optical machine module, so it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0243] 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.

[0244] 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 for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above examples 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 optical machine module, characterized in that: The invention comprises: a front aperture (4), a projection lens (3), an Xcube color combining prism (2) and an image source (1) which are arranged in sequence; The projection lens (3) comprises four aspherical lenses, which are arranged in order from the front aperture (4) to the Xcube color combining prism (2): a first lens (301), a second lens (302), a third lens (303) and a fourth lens (304); the projection lens has a positive optical power; The image source (1) comprises red, green and blue μLED panels, which are used to emit red, green and blue light respectively; The Xcube color combining prism (2) is configured to combine the red, green and blue light rays from the image source (1) to form a full-color image; The pixel size, angular resolution PPD, and diagonal field of view DFOV of the image source (1) satisfy the following relationship: 2.0≤Pixel Size×PPD×DFOV≤8.

0.

2. The optical machine module according to claim 1, wherein: The total focal length f of the optical machine module, the length L of the Xcube color combining prism (2) along the optical axis, and the air gap G between the Xcube color combining prism (2) and the image source (1) satisfy the following relationship: 0.2 mm < flG < 2 mm.

3. The optical machine module according to claim 2, wherein: The optical engine module satisfies the following relationship: 2≤Panel Size+G*tan(arcsin1 / 2F # )+L*tan{arcsin[sin(arcsin1 / 2F # )] / n dcube }≤5; Wherein: Panel Size is the diagonal size of the image source (1), and 0.1 inch ≤ Panel Size ≤ 0.3 inch; G is the air gap between the Xcube color combining prism (2) and the image source (1); L is the length of the Xcube color combining prism (2) along the optical axis; F # is the aperture number of the optical module, and 1≤F # ≤3; n dcube is the refractive index of the Xcube color combining prism (2).

4. The optical machine module according to claim 3, wherein: The aperture number F of the optical machine module # Satisfy: 1≤F # ≤3, and the aperture number F # The ratio of the total focal length f of the optical machine module satisfies the relationship: 0.5≤F# / f≤5.

5. The optical machine module according to claim 1, wherein: The pixel size PixelSize of the image source (1) is 1.5 μm ≤ Pixel Size ≤ 8 μm.

6. The optical machine module according to claim 1, wherein: The effective focal lengths of the four aspherical lenses in the projection lens satisfy the relationship: 0.1 < (f1 + f4) / (f2 + f3) < 0.3, where: f1 is the effective focal length of the first lens (301); f2 is the effective focal length of the second lens (302); f3 is the effective focal length of the third lens (303); f4 is the effective focal length of the fourth lens (304); The first lens (301) and the fourth lens (304) are biconvex lenses; The second lens (302) and the third lens (303) are meniscus lenses.

7. The optical machine module according to claim 6, wherein: The first lens (301) and the second lens (302) have positive optical power, the third lens (303) has negative optical power, and the fourth lens (304) has positive optical power; The effective focal length f1 of the first lens (301), the effective focal length f2 of the second lens (302), the effective focal length f3 of the third lens (303), and the effective focal length f4 of the fourth lens (304) satisfy the following relationship with the total focal length f of the optical machine module: 0.7<f1 / f<1; 5.9<f2 / f<10.3; -0.5<f3 / f<-0.3; 0.5<f4 / f<0.

6.

8. The optical machine module according to claim 6 or 7, characterized in that: The effective focal length f1 of the first lens (301) is: 4mm<f1<6mm; The effective focal length f2 of the second lens (302) is: 33mm<f2<58mm; The effective focal length f3 of the third lens (303) is: -3mm<f3<-2mm; The effective focal length f4 of the fourth lens (304) is: 3mm<f4<4mm.

9. The optical machine module according to claim 6, wherein: The total optical length of the optical machine module is L', which satisfies the following conditions: 0.7<(f1+f4) / L'<1.1, and 3.7<(f2+f3) / L'<6.

8.

10. The optical machine module according to claim 1 or 6, characterized in that: The air gap between the first lens (301) and the second lens (302) is A1, the air gap between the second lens (302) and the third lens (303) is A2, the air gap between the third lens (303) and the fourth lens (304) is A3, and the air gap between the fourth lens (304) and the Xcube color combining prism (2) is A4. The air gaps A1, A2, A3, and A4 satisfy the relationship: 0.7<(A1+A4) / (A2+A3)<0.

9.

11. The optical machine module according to claim 10, wherein: The total optical length of the optical machine module is L', which satisfies the following conditions: 0.1<(A1+A4) / L'<0.2, and 0.1<(A2+A3) / L'<0.

2.

12. The optical machine module according to claim 1, wherein: The total optical length L' of the optical machine module and the image height H of the image source (1) satisfy the following relationship: 0.4<H / L'<0.

5.

13. The optical machine module according to claim 1, wherein: The imaging distance of the optical machine module is infinite, the exit pupil distance of the front aperture (4) is 0≤exit pupil distance<150mm, and the exit pupil distance is the distance along the optical axis from the surface of the front aperture (4) close to the image source (1) to the surface of the first lens (301) far from the image source (1).

14. The optical machine module according to claim 1, wherein: The fourth lens (304) is made of optical glass material.

15. An optical projection device, characterized in that: include: The optical machine module according to any one of claims 1 to 14; and An optical waveguide device, wherein the diameter of the front aperture (4) of the optical machine module matches the entrance pupil diameter of the optical waveguide device.

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