AR optical module and AR optical equipment

Abstract

The embodiment of the utility model provides an AR optical module and AR optical equipment. The AR optical module comprises a display, a plane mirror imaging assembly and a first lens unit; the display emits virtual imaging light; the plane mirror imaging assembly comprises a flat plate lens, a first light splitting element and a polarizing element, the flat plate lens is obliquely arranged relative to the display, and the first light splitting element and the polarizing element are arranged on the flat plate lens; the first lens unit comprises at least one lens, a second light splitting element and a composite film material which are arranged along the same optical axis, the at least one lens comprises a first surface and a second surface, the second light splitting element is arranged on the first surface, the composite film material is arranged on the second surface, and the composite film material comprises a phase retarder and a polarization reflection element which are stacked; the phase delayer is located between the polarization reflection element and the second light splitting element; wherein the first lens unit folds the received virtual imaging light between the second light splitting element and the composite film material, and then the virtual imaging light is transmitted to human eyes through the plane mirror imaging assembly.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to optical display system technical field, more specifically, the embodiment of the utility model relates to a kind of AR optical module and AR optical equipment. BACKGROUND

[0002] Augmented reality (AR) technology provides immersive visual experience for users by superimposing virtual information onto the real world. Some existing AR optical modules adopt Birdbath optical architecture, which combines virtual imaging light and real light through reflection and transmission. However, the traditional Birdbath optical architecture usually has a Cover lens at the outermost side, which is only used for ambient light adjustment and does not have optical function. This existing design results in a large volume of the entire optical system and limited optical performance.

[0003] In the prior art, since the Cover lens is only used as a protective lens and cannot participate in optical path adjustment, the AR optical module has a large volume and the optical performance cannot be further improved. Therefore, how to improve the optical performance without increasing the volume of the AR optical module has become an important problem in Birdbath architecture design. SUMMARY

[0004] The purpose of the present application is to provide a new technical solution for AR optical module and AR optical equipment.

[0005] In a first aspect, the embodiments of the present application provide an AR optical module, which comprises:

[0006] a display for emitting virtual imaging light;

[0007] a plane mirror imaging assembly comprising a flat lens, a first light splitting element and a polarizing element, the flat lens is arranged obliquely relative to the display, and the first light splitting element and the polarizing element are arranged on the flat lens;

[0008] a first lens unit comprising at least one lens, a second light splitting element and a composite film material arranged along the same optical axis, the at least one lens comprises a first surface and a second surface, the second light splitting element is arranged on the first surface, and the composite film material is arranged on the second surface, the composite film material comprises a phase retarder and a polarized reflection element arranged in stack, and the phase retarder is located between the polarized reflection element and the second light splitting element;

[0009] The planar mirror imaging component is configured to partially reflect the virtual imaging light to the first lens unit and allow real-world information light to pass through.

[0010] Optionally, the first light splitting element is arranged on the flat lens close to a side of the display, and the polarizing element is arranged on the flat lens away from the side of the display.

[0011] Optionally, the at least one lens includes a first lens having the first surface and the second surface, wherein the first surface is away from the planar mirror imaging component, and the second surface is close to the planar mirror imaging component.

[0012] Optionally, the first lens is an aspherical lens.

[0013] Optionally, the first lens has a thickness T1, and 0.5mm≤T1≤2mm.

[0014] Optionally, the at least one lens includes a first lens and a second lens, wherein:

[0015] the first lens is located away from the planar mirror imaging component, and the first surface is a surface of the first lens away from the planar mirror imaging component,

[0016] the second lens is located close to the planar mirror imaging component, and the second surface is a surface of the second lens away from the planar mirror imaging component.

[0017] Optionally, the first lens and the second lens are arranged along the optical axis, and there is an air gap between the first lens and the second lens.

[0018] Optionally, the first surface and the second surface have the same surface shape.

[0019] Optionally, the first surface and the second surface are aspherical lenses.

[0020] Optionally, a second lens unit is further arranged between the display and the planar mirror imaging component, and the second lens unit includes at least one third lens.

[0021] Optionally, the third lens is an aspherical lens.

[0022] Optionally, the first lens has a thickness T1, and 0.5mm≤T1≤1mm.

[0023] The second lens has a thickness T2, and 0.5mm≤T2≤1mm.

[0024] In a second aspect, the embodiments of the present application provide an AR optical device, the AR optical device comprising:

[0025] a housing; and

[0026] The AR optical module as claimed in the first aspect.

[0027] The beneficial effects of the present application are:

[0028] The AR optical module provided by the embodiments of the present application is improved based on the Birdbath optical architecture, and the outermost Cover lens is multiplexed to form a folded light path, so that the Cover lens originally only having a protection function has an optical function. This design can significantly improve the optical performance of the AR optical module without increasing the volume of the entire AR optical module, thereby showing a reasonable combination of excellent optical technology optimization and optical element space utilization efficiency.

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

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

[0031] Figure 1 FIG. 1 is a structural schematic diagram of an AR optical module provided by an embodiment of the present application;

[0032] Figure 2 FIG. 2 is a structural schematic diagram of a traditional AR optical module;

[0033] Figure 3 FIG. 3 is a point array diagram of the AR optical module shown in FIG. 1; Figure 1

[0034] FIG. 4 is an MTF diagram of the AR optical module shown in FIG. 1; Figure 4 Figure 1 FIG. 5 is a field curvature and optical distortion diagram of the AR optical module shown in FIG. 1;

[0035] Figure 5 Figure 1 FIG. 6 is a sagittal chromatic aberration diagram of the AR optical module shown in FIG. 1;

[0036] Figure 6 FIG. 7 is a tangential chromatic aberration diagram of the AR optical module shown in FIG. 1; Figure 1

[0037] Figure 7 ​​​Structure diagram of AR optical module provided by an embodiment of the present application;

[0038] Figure 8 For Figure 7 Point array diagram of AR optical module shown in the figure;

[0039] Figure 9 For Figure 7 MTF diagram of AR optical module shown in the figure;

[0040] Figure 10 For Figure 7 Field curvature and optical distortion diagram of AR optical module shown in the figure;

[0041] Figure 11 For Figure 7 Axial chromatic aberration diagram of AR optical module shown in the figure;

[0042] Figure 12 Structure diagram of AR optical module provided by an embodiment of the present application;

[0043] Figure 13 For Figure 12 Point array diagram of AR optical module shown in the figure;

[0044] Figure 14 For Figure 12 MTF diagram of AR optical module shown in the figure;

[0045] Figure 15 For Figure 12 Field curvature and optical distortion diagram of AR optical module shown in the figure;

[0046] Figure 16 For Figure 12 Axial chromatic aberration diagram of AR optical module shown in the figure.

[0047] Explanation of reference signs:

[0048] 1, display; 2, third lens; 21, fifth surface; 22, sixth surface; 3, lens; 31, first surface; 32, second surface; 4, flat plate lens; 5, first light splitting element; 6, polarizing element; 7, second light splitting element; 8, composite film material; 81, phase retarder; 82, polarization reflecting element; 01, human eye; 001, Cover lens. DETAILED DESCRIPTION

[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, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

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

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

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

[0053] It should be noted that like reference numerals and letters in the various figures indicate like elements, and thus, discussions of the same can not be repeated with respect to subsequent figures.

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

[0055] According to an embodiment of the present application, an AR optical module is provided, referring to Figure 1 , Figure 7 and Figure 12 , the AR optical module comprises a display 1, a mirror imaging assembly and a first lens unit; the display 1 is configured to emit virtual imaging light; the mirror imaging assembly comprises a flat lens 4, a first light splitting element 5 and a polarizing element 6, the flat lens 4 is arranged obliquely relative to the display 1, and the first light splitting element 5 and the polarizing element 6 are arranged on the flat lens 4; the first lens unit comprises at least one lens 3, a second light splitting element 7 and a composite film 8 arranged along the same optical axis, the at least one lens 3 comprises a first surface 31 and a second surface 32, the second light splitting element 7 is arranged on the first surface 31, and the composite film 8 is arranged on the second surface 32, the composite film 8 comprises a phase retarder 81 and a polarized reflection element 82 arranged in a stack, and the phase retarder 81 is located between the polarized reflection element 82 and the second light splitting element 7; wherein the mirror imaging assembly is configured to partially reflect the virtual imaging light to the first lens unit and allow real-world information light to pass through; and the first lens unit is configured to fold the received virtual imaging light between the second light splitting element 7 and the composite film 8, and then transmit the virtual imaging light to a human eye 01 through the mirror imaging assembly.

[0056] The optical architecture of the AR optical module provided by the embodiments of the present application is shown in Figure 1 , Figure 7 and Figure 13As shown, this AR optical module mainly includes three core optical components: a display 1, a plane mirror imaging component, and a first lens unit located on the outermost side of the entire module. The display 1, as the information source for the virtual image, is responsible for emitting virtual imaging light, which is the foundation of the AR display system. The plane mirror imaging component is mainly responsible for partially reflecting the virtual imaging light to the first lens unit while allowing real-world information light to pass through. The plane mirror imaging component ensures that the user can both see the virtual image and perceive the surrounding environment, thereby achieving an augmented reality effect.

[0057] Of particular note is the optical structure design of the first lens unit located on the outermost side of the module in this application. It adopts a folded optical path structure. This design allows the first lens unit to not only protect the internal optical components (i.e., act as a cover lens), but more importantly, it also possesses optical functions. Specifically, from an optical function perspective, the first lens unit, through a special optical design, can effectively fold and transmit virtual imaging light, ensuring that the light maintains high clarity even after multiple reflections and transmissions.

[0058] The ingenuity of this design regarding the first lens unit in this application lies in its ability to significantly improve the optical performance of the AR optical module without increasing its overall size. Traditional AR optical modules often require compromises between size and optical performance, while the optical solution provided in this application breaks through this limitation through the novel design of this outer lens unit, thereby providing users with a more compact and efficient AR experience.

[0059] In other words, the AR optical module provided in this application embodiment has both protective and functional features in its structural design. By adding a folded optical path design, it achieves improved optical performance without increasing volume, providing a new approach for the development of augmented reality technology.

[0060] Traditional AR optical modules based on the Birdbath optical architecture have a relatively simple and intuitive optical architecture design. (See also...) Figure 2 The outermost part of the entire AR optical module is a single cover lens 001. The main function of this cover lens 001 is to protect the optical components inside the module from interference and damage from the external environment, such as preventing dust and moisture from entering the module, thereby ensuring the stable operation and long service life of the AR optical module.

[0061] However, in the traditional Birdbath optical architecture, this cover lens 001 only plays a protective role and does not participate in the process of optical imaging. That is, it has no effect on the transmission of virtual imaging light and the superposition of real-world information light. Therefore, although this design ensures the stability and durability of the module to some extent, it also makes the entire AR optical module relatively large in size, making it difficult to further reduce the size.

[0062] In contrast, referring to Figure 1 The AR optical module provided by the embodiments of the present application adopts a new optical design. Among them, the first lens unit is located at the outermost side of the AR optical module, which plays a protective role similar to the cover lens 001, and more importantly, it also has an optical function. Through the design of the folded light path structure, the first lens unit can effectively fold and transmit virtual imaging light, so that the entire AR optical module can achieve higher optical performance while maintaining a smaller size. This design not only improves the portability and comfort of the AR optical module, but also provides users with a more clear and realistic augmented reality experience.

[0063] The following is a detailed analysis of each part of the AR optical module provided by the present application.

[0064] The AR optical module of the embodiments of the present application includes a display 1 for emitting virtual imaging light, which is a basic component of the AR optical module and is responsible for providing the information source of the virtual image.

[0065] The AR optical module of the embodiments of the present application includes a flat mirror imaging assembly, which includes a flat lens 4, a first light splitting element 5 and a polarizing element 6; wherein, referring to Figure 1 The flat lens 4 is arranged obliquely relative to the display 1 for changing the propagation direction of light. The first light splitting element 5 and the polarizing element 6 are arranged on the surface of the flat lens 4. The first light splitting element 5 (for example, a semi-transparent and semi-reflective film) is used to partially reflect the virtual imaging light from the display 1 to the first lens unit, while allowing the real-world information light to pass through. The polarizing element 6 (for example, a polarizing film) is used to control the polarization state of the light.

[0066] The AR optical module of the embodiments of the present application includes a first lens unit, which includes at least one lens 3, a second light splitting element 7 and a composite film 8.

[0067] Firstly, the first lens unit is a key optical component in the AR optical module provided by the present application, which is located at the outermost side of the entire module, not only playing a protective role, but also having important optical functions. This design enables the first lens unit to effectively fold and transmit virtual imaging light while maintaining compactness, thereby improving the optical performance of the AR optical module.

[0068] In the first design, referring to Figure 7 , the first lens unit only has one lens 3. In order to meet the requirements of protection and optical functionality, the single lens 3 is designed to be relatively thick. The second light splitting element 7 and the composite film 8 are respectively arranged on the two surfaces of the same lens 3. The second light splitting element 7 and the composite film 8 cooperate with the lens 3 to achieve light path folding, which can improve the optical performance of the AR optical module. The advantage of this design is that it is simple and compact in structure, and can achieve high optical performance.

[0069] In the second design, referring to Figure 1 and Figure 12 , the first lens unit includes two lenses 3, which are defined as the first lens and the second lens, respectively. The thickness of the two lenses is relatively thin, and there is a gap between them. Such a design enables the two lenses to more flexibly adjust their optical performance. At this time, the second light splitting element 7 and the composite film 8 are respectively arranged on the two lenses. Since there is an air gap between the two lenses, the aberration can be further reduced and the imaging quality can be improved. In addition, thinner lenses are easier to process and manufacture, thereby reducing costs. The advantage of this design is that it can achieve higher optical performance while maintaining a small volume and weight.

[0070] Referring to Figure 1 , Figure 7 and Figure 12 , the first lens unit of the AR optical module provided by the embodiments of the present application has two different design schemes. Both of these two schemes can achieve higher optical performance while maintaining compactness. The specific choice of which scheme depends on the actual application scenario and requirements.

[0071] In the AR optical module provided by the embodiments of the present application, the second light splitting element 7 is arranged on the first surface 31, which is a semi-transparent and semi-reflective film, used to further fold the light path of the virtual imaging light.

[0072] The composite film 8 is arranged on the second surface 32 and includes a phase retarder 81 (for example, a quarter-wave plate) and a polarization reflection element 82 arranged in a stack. The phase retarder 81 is configured to convert linearly polarized light into circularly polarized light or vice versa, and the polarization reflection element 82 is configured to reflect or transmit light according to the polarization state of the light. The stacked structure allows the light to sequentially undergo phase retardation and polarization reflection when passing through the composite film 8, thereby achieving a specific optical function.

[0073] Further, the phase retarder 81 is configured to perform phase retardation on the light and change the polarization state of the light. The phase retarder 81 is a key element for achieving a specific optical function (for example, circularly polarized light conversion).

[0074] The phase retarder 81 is, for example, a quarter-wave plate.

[0075] The polarization reflection element 82 is configured to reflect or transmit light according to the polarization state of the light. In the AR optical module provided in the embodiments of the present application, the polarization reflection element 82 is configured to reflect light of a specific polarization state back into the optical path while allowing light of other polarization states to pass through.

[0076] The polarization reflection element 82 is, for example, a polarization reflection film.

[0077] The second light splitting element 7 and the first light splitting element 5 are both configured to transmit a portion of the light and reflect a portion of the light, and are configured to split the light into different paths or change the propagation direction of the light.

[0078] The first light splitting element 5 and the second light splitting element 7 are, for example, half-transmission half-reflection films.

[0079] The AR optical module provided in the embodiments of the present application has the following optical path:

[0080] The virtual imaging light is emitted by the display 1, transmitted by the flat plate lens 4, and partially reflected by the first light splitting element 5 to enter the first lens unit. In the first lens unit, the virtual imaging light is folded multiple times between the second light splitting element 7 and the composite film 8, sequentially undergoes conversion by the phase retarder 81, reflection by the polarization reflection element 82, and again undergoes phase retardation conversion. Finally, the folded virtual imaging light is transmitted by the flat plate lens 4 and superimposed with the real-world information light of the human eye 01 to form an augmented reality display effect.

[0081] The AR optical module provided in the embodiments of the present application achieves efficient folding and transmission of virtual imaging light through the flat mirror imaging assembly and the first lens unit. The specific technical effects are as follows:

[0082] (1) By multiplexing the lens surface in the first lens unit as a light splitting and reflecting element carrier, the use of additional lenses is reduced, thereby realizing complex light path folding without increasing the overall AR optical module volume.

[0083] (2) By using phase retarders and polarization reflecting elements, the polarization state and transmission path of the light are effectively controlled, which helps to improve the clarity of the virtual image.

[0084] (3) The flat mirror imaging assembly allows real-world information light to pass through while superimposing the folded virtual imaging light, achieving a natural and realistic augmented reality display effect.

[0085] In summary, the AR optical module provided by the embodiments of the present application is based on the Birdbath optical architecture, and the outermost Cover lens is multiplexed to form a folded light path, which has optical functions. This design significantly improves the optical performance of the module without increasing the overall volume of the AR optical module, thereby realizing excellent optical technology optimization and reasonable space utilization efficiency.

[0086] In some examples of the present application, referring to Figure 1 , Figure 7 and Figure 12 , the first light splitting element 5 is disposed on the flat lens 4 near the display 1, and the polarizing element 6 is disposed on the flat lens 4 away from the display 1.

[0087] In this example of the present application, the first light splitting element 5 is directly disposed on the flat lens 4 near the display 1. This design allows the virtual imaging light emitted from the display 1 to first pass through the first light splitting element 5. The main function of the first light splitting element 5 is to partially reflect the virtual imaging light to the human eye 01, while allowing part of the light to pass through for further transmission. This design ensures that the virtual imaging light can be effectively guided to the human eye 01 while maintaining the compactness of the optical path.

[0088] The polarizing element 6 is disposed on the flat lens 4 away from the display 1. This design allows the virtual imaging light reflected by the first light splitting element 5 and the real-world light that passes through the flat lens 4 to pass through the polarizing element 6. The main function of the polarizing element 6 is to adjust the polarization state of the light to ensure that the virtual imaging light and the real-world light have appropriate polarization directions when entering the human eye finally. This helps to reduce glare and ghosting, and improve image clarity.

[0089] The flat lens 4 as an important component in the mirror imaging assembly not only supports and fixes the first light splitting element 5 and the polarizing element 6, but also further adjusts and optimizes the light through its lens optical effect.

[0090] In summary, by arranging the first light splitting element 5 and the polarizing element 6 on both sides of the flat lens 4, it can ensure that the virtual imaging light and the real world light are fully adjusted and optimized when passing through the mirror imaging assembly. This design helps to improve the clarity and contrast of the image, while reducing glare and ghosting phenomenon. The design in this example of the application enables the AR optical module to maintain a small volume and weight while maintaining high optical performance. This is of great significance to improve the wearing comfort and portability of AR devices.

[0091] In addition, by optimizing the optical path and light adjustment mechanism, the design in this example can provide users with clearer virtual images and superimposed effects of real world information. This helps to enhance the user's immersion and interaction experience.

[0092] In some examples of the application, referring to Figure 7 , the at least one lens 3 includes a first lens having the first surface 31 and the second surface 32, wherein the first surface 31 is away from the mirror imaging assembly, and the second surface 32 is close to the mirror imaging assembly.

[0093] The lens 3 mentioned in this example of the application is the first lens shown in Figure 7 , which directly uses the two surfaces of the first lens, i.e. the first surface 31 and the second surface 32, to support the second light splitting element 7 and the composite film 8 respectively. In this example of the application, the first surface 31 is away from the mirror imaging assembly, and the second surface 32 is close to the mirror imaging assembly. Such configuration enables the light emitted through the mirror imaging assembly to be folded multiple times between the first surface 31 and the second surface 32, thereby forming a folded optical path.

[0094] The mirror imaging assembly (such as the flat lens 4 with semi-transmissive and semi-reflective properties) plays a key role in the entire AR module, which allows light to switch or superimpose between virtual and real light paths. This switching or superimposition is achieved through the reflection and transmission of light on the two surfaces of the first lens 3.

[0095] The design of the second light splitting element 7 and the composite film 8 in combination with a single lens 3 (i.e. the first lens) realizes optical path folding, which can improve the optical performance of the AR optical module. The advantage of this design is that it is simple and compact, and can achieve high optical performance.

[0096] In some examples of the present application, referring to Figure 7 , the first lens is an aspherical lens.

[0097] Aspherical lenses can reduce aberrations more effectively than spherical lenses. This is because the surface shape of an aspherical lens is not simply spherical, but is designed according to a specific mathematical function, so that the transmission path of light can be adjusted more accurately. Reducing aberrations is crucial to ensure the clarity and accuracy of the image.

[0098] In some examples of the present application, referring to Figure 7 , the first lens located in the folded optical path is designed as an aspherical lens, which helps to provide higher quality virtual images and reduce image blurring and distortion.

[0099] In addition, aspherical lenses can also have smaller volume and weight while maintaining the same performance. In near-eye optical systems, reducing the module volume is crucial to improve the wearing comfort and portability of users. The use of aspherical lenses helps to achieve more compact and lightweight system design.

[0100] In some examples of the present application, referring to Figure 1 , the thickness of the first lens is T1, and 0.5mm≤T1≤2mm.

[0101] In some examples of the present application, referring to Figure 12 and Figure 1 , the at least one lens 3 includes a first lens and a second lens, wherein: the first lens is located away from the mirror imaging assembly, and the first surface 31 is the surface of the first lens away from the mirror imaging assembly, the second lens is located close to the mirror imaging assembly, and the second surface 32 is the surface of the second lens away from the mirror imaging assembly.

[0102] In some examples of the present application, the first lens and the second lens are arranged along the optical axis, and there is an air gap between the first lens and the second lens.

[0103] In some examples of the present application, referring to Figure 12 and Figure 7 , the first lens unit is designed to include two lenses: a first lens and a second lens. Compared to Figure 1In the first lens shown in the figure, the thickness of the two lenses in this example of the present application is relatively thin, and there is a certain air gap between them. Such a design makes the two lenses more flexible in adjusting their optical performance. On this basis, the second light splitting element 7 and the composite film 8 are respectively arranged on the two lenses. Because of the air gap between the two lenses, the aberration can be further reduced and the imaging quality can be improved. In addition, thinner lenses are also easier to process and manufacture, thereby reducing costs. The advantage of this design is that it can achieve higher optical performance while maintaining a small volume and weight.

[0104] Referring to Figure 7 , Figure 12 and Figure 1 , the first lens unit of the AR optical module provided by the embodiments of the present application has two different design schemes. Both of these two schemes can achieve higher optical performance while maintaining compactness. The choice of which scheme depends on the actual application scenario and requirements.

[0105] In some examples of the present application, the first surface 31 and the second surface 32 have the same face type.

[0106] The same face type means that the same mold or processing technology can be used in the design and manufacturing process, thereby reducing production costs and complexity. Consistent face type design helps to improve product consistency. In some cases, the same face type can better control the propagation path and focusing effect of light, thereby optimizing the imaging quality of the AR optical module. Through precise calculation and design, the same face type can achieve specific optical effects, such as achromatization, distortion reduction, etc. In addition, during assembly, the same face type can more easily achieve alignment and fixation between lenses, reducing assembly errors. This helps to improve production efficiency and ensure that the performance of the final product meets expectations.

[0107] Taking this example of the present application as an example, the first lens and the second lens, which are away from the surface of the human eye 01, i.e. the first surface 31 and the second surface 32, both have the same face type and are used to support the optical film. Such a design can help to optimize the propagation effect of virtual light path and real light path, ensuring that the light can maintain good imaging quality after multiple reflections and transmissions. At the same time, the same face type design also helps to simplify the manufacturing and assembly process of the lens 3, improving production efficiency.

[0108] In some examples of the present application, referring to Figure 12 and Figure 1 , the first surface 31 and the second surface 32 are aspherical lenses.

[0109] In this example of the present application, the first lens and the second lens located in the folded optical path are designed to each include an aspherical surface, which helps to provide high-quality virtual images and effectively reduce image blurring and distortion. In addition, the aspherical surface design can make the lenses have smaller volume and weight while maintaining the same performance. In a near-eye optical device / system, reducing the module volume is crucial to improve the user's wearing comfort and portability. The use of aspherical lenses helps to achieve a more compact and lightweight system design.

[0110] In some examples of the present application, referring to Figure 12 and Figure 7 , the thickness of the first lens is T1, and 0.5mm≤T1≤1mm, and the thickness of the second lens is T2, and 0.5mm≤T2≤1mm.

[0111] Compared with the example shown in Figure 1 , the first lens unit design in this example of the present application includes two lenses: a first lens and a second lens, which respectively support the film material forming the folded optical path. The thickness of the two lenses is thinner than that of a single lens, and there is an air gap between the two lenses, which can achieve good optical imaging effect.

[0112] In some examples of the present application, the first light splitting element 5 and the second light splitting element 7 are both half-transmission half-reflection films; the phase retarder 81 is a quarter-wave plate; and the polarization reflection element 82 is a polarization reflection film.

[0113] According to another embodiment of the present application, an AR optical device is provided, which includes a housing and an AR optical module as described above, and the AR optical module is arranged in the housing.

[0114] The AR optical module of the present application is described below by way of Example 1 and Example 3 respectively.

[0115] Example 1

[0116] The AR optical module provided in this example 1, referring to Figures 3 to 6 , includes the following main optical components:

[0117] The display 1 is used to emit virtual imaging light;

[0118] The planar mirror imaging assembly includes a flat lens 4, a first light splitting element 5, and a polarizing element 6, wherein: the flat lens 4 is arranged obliquely relative to the display 1, the first light splitting element 5 is arranged on the flat lens 4 close to one side of the display 1, and the polarizing element 6 is arranged on the flat lens 4 away from the other side of the display 1;

[0119] The first lens unit comprises a first lens, a second lens, a second light splitting element 7 and a composite film 8 arranged along the same optical axis, wherein: the first lens comprises a first surface 31 (the right surface, i.e. the surface away from the human eye 01), the second lens comprises a second surface 32 (the right surface, i.e. the surface away from the human eye 01), and the first surface 31 and the second surface 32 are aspherical surfaces; the thickness of the first lens and the second lens is 0.5 mm;

[0120] The second light splitting element 7 is arranged on the first surface 31, and the composite film 8 is arranged on the second surface 32. The composite film 8 comprises a phase retarder 81 and a polarization reflection element 82 arranged in layers, and the phase retarder 81 is located between the polarization reflection element 82 and the second light splitting element 7.

[0121] The planar mirror imaging assembly is used to partially reflect the virtual imaging light to the first lens unit and allow the real world information light to pass through; the first lens unit is used to fold the received virtual imaging light between the second light splitting element 7 and the composite film 8 and then transmit the virtual imaging light to the human eye 01 through the planar mirror imaging assembly.

[0122] The second lens unit is arranged between the display 1 and the planar mirror imaging assembly, and the second lens unit comprises a third lens 2. The two surfaces of the third lens 2 are a fifth surface 21 and a sixth surface 22, respectively.

[0123] The AR optical module provided in the embodiment 1 has the following optical parameters shown in Table 1.

[0124] Table 1

[0125]

[0126]

[0127] The AR optical module provided in the embodiment 1 has the following optical performance as shown in Figure 3 . Figure 4 is a schematic diagram of a spot diagram, Figure 5 is a MTF curve diagram, Figure 6 is a field curvature and distortion diagram, Figure 3 is an axial chromatic aberration diagram.

[0128] The spot diagram refers to a dispersed diagram formed by a point emitting many light rays, which are no longer concentrated on the same point on the image plane due to aberration after passing through the optical module, and is used to evaluate the imaging quality of the projection optical module. Referring to Figure 4 , the maximum value of the image point in the spot diagram of the AR optical module provided in the embodiment 1 is less than 9 μm.

[0129] MTF curve is a modulation transfer function diagram, which represents the imaging clarity of the optical module by the contrast of black and white lines. See Figure 5 The AR optical module provided in Embodiment 1 has an MTF of >0.4 at 40 lp / mm.

[0130] See Figure 6 The AR optical module provided in Embodiment 1 has a maximum distortion of <7% at 1 field of view.

[0131] Axial chromatic aberration, also known as magnification chromatic aberration, mainly refers to a complex color chief ray on the object side, which becomes multiple rays on the image side due to the dispersion of the refractive system. The difference between the focal point positions of blue light and red light on the image plane. See Figure 7 The AR optical module provided in Embodiment 1 has a maximum chromatic aberration of <24 μm.

[0132] Embodiment 2

[0133] The AR optical module provided in Embodiment 2 comprises the following main optical components: Figures 8 to 11

[0134] Display 1 for emitting virtual imaging light;

[0135] Plane mirror imaging component, comprising flat lens 4, first light splitting element 5 and polarizing element 6, wherein: the flat lens 4 is arranged obliquely relative to the display 1, the first light splitting element 5 is arranged on the flat lens 4 close to one side of the display 1, and the polarizing element 6 is arranged on the flat lens 4 away from the display 1;

[0136] First lens unit, comprising first lens, second light splitting element 7 and composite film material 8 arranged along the same optical axis, wherein: the first lens is an aspherical lens, the thickness of the first lens is 2 mm, and the first lens comprises first surface 31 and second surface 32;

[0137] The second light splitting element 7 is arranged on the first surface 31, and the composite film material 8 is arranged on the second surface 32. The composite film material 8 comprises a phase retarder 81 and a polarization reflection element 82 arranged in layers. The phase retarder 81 is located between the polarization reflection element 82 and the second light splitting element 7.

[0138] Wherein, the plane mirror imaging component is used to partially reflect the virtual imaging light to the first lens unit and allow the real world information light to pass through; the first lens unit is used to fold the received virtual imaging light between the second light splitting element 7 and the composite film material 8, and then transmit it to the human eye 01 through the plane mirror imaging component. ​

[0139] The partial optical parameters of the AR optical module provided in Embodiment 2 are shown in Table 2.

[0140] Table 2

[0141]

[0142] The optical performance of the AR optical module provided in Embodiment 2 is shown in Table 3. Figure 8 Figure 9 is a schematic diagram of a spot diagram, Figure 10 is a curve diagram of MTF, Figure 11 is a diagram of field curvature and distortion, Figure 8 is a diagram of axial chromatic aberration.

[0143] Referring to Table 3, the maximum value of the image point in the spot diagram of the AR optical module provided in Embodiment 2 is less than 14 μm. Figure 9 Referring to Table 3, the MTF of the AR optical module provided in Embodiment 2 is greater than 0.1 at 40 lp / mm.

[0144] Figure 10 Referring to Table 3, the maximum distortion of the AR optical module provided in Embodiment 2 occurs at 1 field of view, and the absolute value is less than 7%.

[0145] Referring to Table 3, the maximum chromatic aberration of the AR optical module provided in Embodiment 2 is less than 24 μm. Figure 11

[0146] Figure 12

[0147] Embodiment 3

[0148] The AR optical module provided in Embodiment 3 includes the following main optical components, as shown in Table 4. Figures 13 to 16

[0149] a display 1 for emitting virtual imaging light;

[0150] a planar mirror imaging assembly including a flat lens 4, a first light splitting element 5, and a polarizing element 6, wherein the flat lens 4 is arranged obliquely relative to the display 1, the first light splitting element 5 is arranged on the flat lens 4 on a side close to the display 1, and the polarizing element 6 is arranged on the flat lens 4 on a side away from the display 1;

[0151] a first lens unit including a first lens, a second lens, a second light splitting element 7, and a composite film 8 arranged along the same optical axis, wherein the first surface 31 of the first lens and the second surface 32 of the second lens are aspheric lenses, and the thicknesses of the first lens and the second lens are both 0.5 mm;

[0152] ​​​​​​The second light splitting element 7 is arranged on the first surface 31, the composite film material 8 is arranged on the second surface 32, the composite film material 8 comprises a phase retarder 81 and a polarization reflection element 82 arranged in layers, and the phase retarder 81 is located between the polarization reflection element 82 and the second light splitting element 7.

[0153] The plane mirror imaging assembly is configured to partially reflect the virtual imaging light to the first lens unit and allow real-world information light to pass through; and the first lens unit is configured to transmit the received virtual imaging light to the human eye 01 through the plane mirror imaging assembly after folding the virtual imaging light between the second light splitting element 7 and the composite film material 8.

[0154] The AR optical module provided in Embodiment 3 has the following optical parameters as shown in Table 3.

[0155] Table 3

[0156]

[0157] The AR optical module provided in Embodiment 3 has the following optical performance as shown in Table 3. Figure 13 Figure 14 is a schematic diagram of a spot diagram, Figure 15 is a MTF curve diagram, Figure 16 is a field curvature and distortion diagram, Figure 13 is an axial chromatic aberration diagram.

[0158] Referring to Figure 14 , the AR optical module provided in Embodiment 3 has a maximum value of an image point in the spot diagram less than 16 μm.

[0159] Referring to Figure 15 , the AR optical module provided in Embodiment 3 has an MTF greater than 0.1 at 40 lp / mm.

[0160] Referring to Figure 16 , the AR optical module provided in Embodiment 3 has a maximum distortion occurring at 1 field of view, and an absolute value less than 7%.

[0161] Referring to ​ , the AR optical module provided in Embodiment 3 has a maximum chromatic aberration value less than 24 μm.

[0162] The specific embodiments of the AR optical device of the present application can refer to the above-mentioned embodiments of the AR optical module, and therefore at least have all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0163] ​The above embodiments mainly describe the differences between the various embodiments, and the optimization features different between the various embodiments can be combined to form a better embodiment without contradiction. For the sake of brevity, details are not repeated here.

[0164] Although some specific embodiments of the present application have been described in detail by way of example with reference to the drawings, it is to be understood that the examples are for illustration only and are not intended to limit the scope of the present application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An AR optical module, characterized by, The application relates to a virtual image display device, comprising: a display (1) for emitting virtual imaging light rays; a mirror imaging assembly comprising a flat lens (4), a first light splitting element (5) and a polarizing element (6), the flat lens (4) being arranged obliquely relative to the display (1), the first light splitting element (5) and the polarizing element (6) being arranged on the flat lens (4); a first lens unit comprising at least one lens (3), a second light splitting element (7) and a composite film (8) arranged along the same optical axis, the at least one lens (3) comprising a first surface (31) and a second surface (32), the second light splitting element (7) being arranged on the first surface (31), the composite film (8) being arranged on the second surface (32), the composite film (8) comprising a phase retarder (81) and a polarized reflection element (82) arranged in layers, and the phase retarder (81) being located between the polarized reflection element (82) and the second light splitting element (7); wherein the mirror imaging assembly is configured to partially reflect the virtual imaging light rays to the first lens unit and allow real-world information light rays to pass through; and the first lens unit is configured to fold the received virtual imaging light rays between the second light splitting element (7) and the composite film (8) and then transmit the virtual imaging light rays to a human eye (01) through the mirror imaging assembly. 2.The AR optical module of claim 1, wherein, The first light splitting element (5) is arranged on one side of the flat lens (4) close to the display (1), and the polarizing element (6) is arranged on the other side of the flat lens (4) away from the display (1). 3.The AR optical module of claim 1, wherein, The at least one lens (3) comprises a first lens having the first surface (31) and the second surface (32), wherein the first surface (31) is away from the mirror imaging assembly, and the second surface (32) is close to the mirror imaging assembly. 4.The AR optical module of claim 3, wherein, The first lens is an aspherical lens.

5. The AR optical module according to claim 3, wherein The thickness of the first lens is T1, and 0.5mm <= T1 <= 2mm. 6.The AR optical module of claim 1, wherein, The at least one lens (3) comprises a first lens and a second lens, wherein: the first lens is located on the side away from the mirror imaging assembly, and the first surface (31) is the surface of the first lens away from the mirror imaging assembly, the second lens is located on the side close to the mirror imaging assembly, and the second surface (32) is the surface of the second lens away from the mirror imaging assembly. 7.The AR optical module of claim 6, wherein, The first lens and the second lens are arranged along the optical axis, and there is an air gap between the first lens and the second lens. 8.The AR optical module of claim 6, wherein, The first surface (31) and the second surface (32) have the same surface shape. 9.The AR optical module of claim 6, wherein, The first surface (31) and the second surface (32) are aspherical surfaces. 10.The AR optical module of claim 6, wherein, The thickness of the first lens is T1, and 0.5mm <= T1 <= 1mm; The thickness of the second lens is T2, and 0.5mm <= T2 <= 1mm. 11.The AR optical module of claim 1, wherein, A second lens unit is further arranged between the display (1) and the mirror imaging assembly, and the second lens unit comprises at least one third lens (2). 12.The AR optical module of claim 11, wherein, The third lens (2) is an aspherical lens.

13. An AR optical device, comprising: Comprising: a housing; and The AR optical module according to any one of claims 1-12.

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