Augmented reality device and assembling method of ray machine

Abstract

The embodiment of the invention provides an augmented reality device and an assembling method of an optical machine. The augmented reality device comprises a spectacle frame; the waveguide sheet is arranged on the spectacle frame and used for being arranged opposite to the eyes of a user, and the waveguide sheet is used for projecting a virtual image; the optical machine is arranged opposite to the waveguide sheet and close to the glasses legs of the glasses frame, the optical machine is used for generating and projecting a virtual image, and the image is optically coupled to the waveguide sheet through an optical system; the transparent bracket is arranged between the waveguide sheet and the optical machine; the first adhesive layer is arranged between the ray machine and the transparent bracket and is used for fixing the ray machine and the transparent bracket; and the second adhesive layer is arranged between the waveguide sheet and the transparent bracket and is used for fixing the waveguide sheet and the transparent bracket. According to the mode, the assembling precision of the optical machine and the waveguide sheet in the augmented reality device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of augmented reality technology, in particular to an augmented reality device and an assembly method of an optical engine. BACKGROUND

[0002] With the rapid development of augmented reality (AR) technology, it has been widely popularized in many application scenarios such as smart wear, industrial manufacturing, medical assistance, and education training. The augmented reality device (i.e. AR device) superimposes virtual images on the real environment to bring users an immersive interactive experience. In a typical AR system, the optical engine is the generation and projection unit of virtual images, and the outgoing light needs to be introduced into the user's eyes through the optical waveguide sheet to realize image display. Therefore, the assembly precision, structural stability and optical coupling quality between the optical engine and the waveguide sheet directly affect the final image clarity, positioning accuracy and user experience.

[0003] In the prior art, the fixing method of the optical engine and the waveguide sheet mainly adopts mechanical buckle or support structure, screw and gasket structure and the like. These traditional fixing methods have certain implementation basis in structure design and processing manufacturing, but also have obvious deficiencies. For example, the mechanical buckle or support structure usually occupies a large space, which is not conducive to the design of thin and light equipment, and the relative displacement of parts is easy to occur in long-term use or vibration environment, which leads to the deviation of optical path and affects the stability and accuracy of the image. Although the screw and gasket method can improve the mechanical strength, the installation process is complicated, the assembly consistency is high, and the aging deformation risk of the buffer material is easy to cause structural loosening and adhesion failure, affecting the service life.

[0004] Therefore, there is an urgent need for a fixing scheme of the optical engine and the waveguide sheet with strong optical compatibility and compact structure to make up for the deficiencies of the prior art in structure performance and optical consistency. SUMMARY

[0005] The embodiment of the present application provides an augmented reality device, which comprises:

[0006] a spectacle frame;

[0007] a waveguide sheet, which is arranged on the spectacle frame and is arranged opposite to the user's eyes, and is used for projecting virtual images;

[0008] an optical engine, which is arranged opposite to the waveguide sheet and is arranged close to the spectacle leg of the spectacle frame, and is used for generating and projecting virtual images and coupling image light to the waveguide sheet through an optical system;

[0009] A transparent support is arranged between the waveguide sheet and the light machine;

[0010] A first glue layer is arranged between the light machine and the transparent support to fix the light machine and the transparent support;

[0011] A second glue layer is arranged between the waveguide sheet and the transparent support to fix the waveguide sheet and the transparent support;

[0012] After filling the first glue layer between the light machine and the transparent support and filling the second glue layer between the waveguide sheet and the transparent support, the light path of the light machine and the light path of the waveguide sheet are aligned;

[0013] After the alignment of the light paths, the first glue layer and the second glue layer are solidified to fix the light machine and the waveguide sheet to the transparent support.

[0014] In a possible embodiment, the surface of the transparent support facing the light machine is a first surface; the first surface has a limiting groove, and the outer contour of the connecting part of the light machine and the limiting groove matches the inner contour of the limiting groove.

[0015] In a possible embodiment, the limiting groove is a rectangular groove, and the outer contour of the connecting part of the light machine and the limiting groove is rectangular.

[0016] In a possible embodiment, the first glue layer is a rectangular glue layer filled between the limiting groove and the light machine.

[0017] In a possible embodiment, the transparent support is arranged at the edge of the waveguide sheet, and the surface of the transparent support facing the waveguide sheet is a second surface; the second surface has a positioning groove, and the edge of the waveguide sheet is clamped in the positioning groove.

[0018] In a possible embodiment, the transparent support has a through hole, and the light of the light machine is projected from the through hole.

[0019] In a possible embodiment, the transparent support comprises a support body arranged on the waveguide sheet, and the support body has a through hole; a limiting block arranged on the support body, and the through hole penetrates the limiting block; wherein the light machine is arranged on the limiting block.

[0020] In a possible embodiment, the limiting block is a rectangular limiting block, and the limiting block has a limiting groove on the side facing the light machine, and the light machine is used for clamping in the limiting groove.

[0021] In a possible embodiment, the limiting block is a wedge-shaped limiting block.

[0022] In a possible embodiment, the first glue layer and the second glue layer are UV glue layers; and / or the material of the transparent support is PMMA material.

[0023] In a possible embodiment, the waveguide plates are two, the light machines are two, the two light machines correspond to the two waveguide plates respectively, and are arranged oppositely, and the two waveguide plates are arranged oppositely with respect to a pair of eyes of a user.

[0024] In a possible embodiment, the augmented reality device further comprises a lens plate arranged on the spectacle frame.

[0025] The embodiment of the present application further provides an assembly method of a light machine, comprising the following steps:

[0026] A transparent support is arranged between the waveguide plate and the light machine, the transparent support has a first surface facing the light machine and a second surface facing the waveguide plate;

[0027] An outer contour of the light machine is embedded in a limiting groove on the first surface, and the limiting groove and the outer contour of the light machine are matched with each other;

[0028] An edge of the waveguide plate is clamped in a positioning groove on the second surface;

[0029] A first glue layer is filled between the light machine and the limiting groove, and a second glue layer is filled between the waveguide plate and the positioning groove;

[0030] The first glue layer and the second glue layer are cured in the case that the light emitted by the light machine and the light incident on the waveguide plate are aligned, so as to fix the light machine and the waveguide plate to the transparent support.

[0031] The augmented reality device provided by the embodiment of the present application realizes a compact structure, accurate positioning and excellent optical performance by arranging a transparent support between the light machine and the waveguide plate, and arranging a first glue layer and a second glue layer between the light machine and the support and between the waveguide plate and the support respectively. Compared with the existing mechanical buckle or screw fixing mode, the scheme has significant technical advantages in structure design and optical coupling.

[0032] Specifically, by arranging the upper and lower two glue layers, UV curing can be performed after optical alignment is completed, so as to effectively realize micron-level positioning accuracy, solve the installation tolerance and displacement caused by vibration which cannot be avoided by the traditional mechanical structure, and significantly improve the stability and alignment accuracy of the image. At the same time, the structure cancels the rigid connecting members such as metal buckles and screws, so that the overall device is lighter and thinner, which is beneficial to the miniaturization design of the augmented reality device.

[0033] In summary, the structural scheme of the embodiment of the present application not only improves the assembly accuracy and structural stability of the light machine and the waveguide sheet in the augmented reality device, but also optimizes the optical transmission path, has good optical compatibility, reliability and engineering practicability, and can significantly improve the shortcomings of the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0034] Explanation of reference signs: 100, eyeglass frame; 1001, middle frame main body; 1002, eyeglass leg; 1003, eyeglass sheet; 1004, protective cover; 11, waveguide sheet; 12, light machine; 13, transparent support; 131, first surface; 132, second surface; 133, support body; 1331, positioning groove; 134, limiting block; 1341, limiting groove; 135, through hole; 14, first adhesive layer.

[0035] Figure 1a is the overall assembly view of the augmented reality device in the embodiment of the present application;

[0036] Figure 1b is the structural schematic view of the eyeglass frame part of the augmented display device in the embodiment of the present application after the shell is hidden;

[0037] Figure 1c is Figure 1b is the enlarged view of C in FIG. 8;

[0038] Figure 1d is the structural schematic view of the assembly of the light machine, the waveguide sheet and the transparent support;

[0039] Figure 2 is Figure 1d is the enlarged view of A in FIG. 9;

[0040] Figure 3 is the structural schematic view of the assembly of the waveguide sheet, the transparent support and the first adhesive layer in the embodiment of the present application;

[0041] Figure 4 is Figure 3 is the enlarged view of B in FIG. 10;

[0042] Figure 5 is the front structural schematic view of the waveguide sheet in the embodiment of the present application;

[0043] Figure 6 is the structural schematic view of the back of the waveguide sheet in the embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the claims of the present application can be implemented even without these technical details and based on various changes and modifications of the following embodiments.

[0045] Unless otherwise required by context, the word "comprise" and variations such as "comprises" or "comprising" will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.

[0046] The embodiments of the present application will be described in detail below with reference to the drawings, so as to make the objects, features and advantages of the present application clearer. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present application, but only to illustrate the essential spirit of the technical solutions of the present application.

[0047] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0048] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. It should be noted that the term "comprising" is typically used in its inclusive sense, unless otherwise specifically indicated.

[0049] In the following description, for the purpose of clarity, directional terms such as "front", "back", "left", "right", "outer", "inner", "outward", "inward", "up", "down", etc. will be used with respect to the accompanying drawings. However, it should be noted that these terms are used for convenience only and do not necessarily reflect the position of the present application in use.

[0050] Embodiments of the present application will be described below with reference to the accompanying drawings.

[0051] Figure 1a The overall assembly of the augmented reality device of the embodiments of the present application is shown, Figure 1b The structure of the eyeglass frame part of the augmented reality device of the embodiments of the present application is shown after the part is hidden, Figure 1c The enlarged view of the middle C is shown, Figure 1b The enlarged view of the middle C is shown,

[0052] Figure 1d The overall assembly of the augmented reality device of the embodiment of the present application is shown; Figure 2 An enlarged view of the connection details between the transparent support 13 and the light engine 12 (i.e. area A) is provided; Figure 3 The assembled state of the waveguide sheet 11, the transparent support 13 and the first adhesive layer 14 is shown; Figure 4 For Figure 3 The enlarged area marked as "B" shows the structural features of the transparent support 13 and the connection mechanism thereof with the waveguide sheet 11 and the light engine 12.

[0053] An embodiment of the present application provides an augmented reality device, as shown in the figure, which comprises a spectacle frame, a pair of waveguide sheets 11, a light engine 12, a transparent support 13, a first adhesive layer 14 and a second adhesive layer (not shown in the figure). Figures 1a to 4

[0054] The overall form of the augmented reality device is similar to a pair of glasses, and the spectacle frame 100 is the frame body of the augmented reality device. The waveguide sheets 11 are arranged separately on the spectacle frame 100 and are arranged opposite to one eye of the user, and the waveguide sheets 11 are used to project virtual images. In this embodiment, the waveguide sheets 11 are arranged at the positions where the lenses should be arranged on the right side of the spectacle frame 100, and the light engine 12 is arranged opposite to the waveguide sheets 11 and close to the spectacle temples 1002 of the spectacle frame 100.

[0055] As shown in the figure, the spectacle frame 100 comprises a middle frame body 1001 and a pair of spectacle temples 1002 arranged separately on both sides of the middle frame body 1001, and the waveguide sheets 11 are arranged on the middle frame body 1001. In addition, a lens 1003 is also arranged on the middle frame body 1001, and the waveguide sheets 11 and the lens 1003 are both arranged opposite to a pair of eyes of the user. Figure 1a The light engine 12 is arranged opposite to the waveguide sheets 11, and the light engine 12 is used to generate and project virtual images, and the image light is coupled to the waveguide sheets 11 through an optical system. The transparent support 13 is arranged between the waveguide sheets 11 and the light engine 12; the first adhesive layer 14 is arranged between the light engine 12 and the transparent support 13, and is used to fix the light engine 12 and the transparent support 13; and the second adhesive layer is arranged between the waveguide sheets 11 and the transparent support 13, and is used to fix the waveguide sheets 11 and the transparent support 13.

[0056] The middle frame body 1001 further comprises a protective cover 1004, which is fixed on the middle frame body 1001 when the light engine 12 is arranged on the light engine 12 through the transparent support 13, and is used to protect the light engine 12.

[0057]

[0058] ​​During the assembly of the optical engine 12, the first glue layer can be filled between the optical engine 12 and the transparent support 13 first, and the second glue layer can be filled between the waveguide sheet 11 and the transparent support 13. After the alignment of the light path of the optical engine 12 and the light path of the incident end of the waveguide sheet 11, the first glue layer and the second glue layer can be cured to fix the optical engine 12 and the waveguide sheet 11 to the transparent support 13. The curing method can be curing by light irradiation.

[0059] In the scheme of the embodiment of the present application, the waveguide sheet 11 is the key component of image transmission, which guides light by the principle of total reflection to ensure accurate projection of virtual images into the user's field of view. The optical engine 12 is responsible for generating high-quality image light, which is effectively coupled with the waveguide sheet 11 through precise optical design. The transparent support 13 not only supports the waveguide sheet 11 and the optical engine 12, but also optimizes the structural layout of the device, making it more compact and stable. The image light generated by the optical engine 12 is adjusted by the optical system, enters the waveguide sheet 11 and propagates through total reflection, and finally forms a virtual image at the user's eyes. The technical scheme in the embodiment realizes clear display of virtual images and firm assembly of the device, improving user experience and equipment reliability. In other embodiments, different types of optical systems or materials can be used to solve the display quality and durability problems in specific environments.

[0060] In the above-mentioned augmented reality device, by introducing the transparent support 13 between the waveguide sheet 11 and the optical engine 12, and cooperating with the double glue layer fixing method of the first glue layer and the second glue layer, the high-precision alignment and long-term stable fixation of the optical engine 12 and the waveguide sheet 11 are realized. Before the glue layer is cured, the plasticity of the glue layer is used for dynamic fine adjustment of the light path, so that the optical axis of the light emitted by the optical engine 12 is highly consistent with the optical axis of the incident end of the waveguide sheet 11, thereby eliminating the static deviation caused by processing errors or assembly tolerances in traditional mechanical assembly. The cured double glue layer works with the transparent support 13 in a shearing stress mode, effectively disperses external impact and thermal stress, prevents displacement of the optical engine 12 or the waveguide sheet 11, and realizes stability that the optical axis deviation is less than 0.05° under temperature cycles of-40℃ to 85℃ and high vibration environment. At the same time, the transparent support 13 is made of a material with high light transmittance and refractive index matching the glue layer, and cooperates with a light-transmitting structure without metal shielding, to ensure that the light path of the optical engine 12 is not blocked and directly reaches the waveguide sheet 11, so that the light transmission efficiency is improved to more than 95%, which is significantly better than the optical performance of the traditional screw or buckle fixing structure. This technical scheme not only realizes the dual improvement of optical precision and structural reliability, but also simplifies the assembly process, adapts to the automatic dispensing and UV curing production process, reduces the assembly time and improves the batch production consistency, and meets the comprehensive requirements of AR glasses in light weight, optical performance and durability.

[0061] Figure 5 is a front structure schematic diagram of the waveguide sheet 11 in the embodiment of the present application;Figure 6 is a structural schematic diagram of the reverse side of the waveguide sheet 11 in the embodiment of the present application.

[0062] Further, as shown in Figures 3 to 6 , the surface of the transparent support 13 facing the optical engine 12 is the first surface 131; the first surface 131 has a limiting groove 1341, and the outer contour of the connecting part of the optical engine 12 and the limiting groove 1341 matches the inner contour of the limiting groove 1341. The design of the limiting groove 1341 ensures the accurate installation position of the optical engine 12, avoiding the decline of optical performance caused by position deviation. Through the close fit of the limiting groove 1341 and the outer contour of the optical engine 12, the small gap that may be generated during assembly is eliminated, the scattering and loss in the optical path are reduced, and the image quality is improved. This design simplifies the assembly process, reduces production costs, and at the same time enhances the structural stability of the device. In other embodiments, the shape or size of the limiting groove 1341 can also be adjusted to adapt to different models of optical engines 12, realizing a wider range of applications.

[0063] Further, the limiting groove 1341 is a rectangular groove, and the outer contour of the connecting part of the optical engine 12 and the limiting groove 1341 is rectangular. The rectangular limiting groove 1341 matches the rectangular outer contour of the optical engine 12, providing a stable mechanical contact surface, which is conducive to improving the overall rigidity and impact resistance of the device. The rectangular structure can effectively disperse stress and reduce the risk of damage caused by external impact. The technical solution in this embodiment not only ensures the accurate installation of the optical engine 12, but also enhances the durability of the device, which is suitable for long-term use and application in complex environments. In other embodiments, round or other polygonal limiting grooves 1341 can also be used to meet the requirements of device shape or function in specific scenarios.

[0064] Further, as shown in Figure 4 , the first adhesive layer 14 is a rectangular adhesive layer, and the rectangular adhesive layer is filled between the limiting groove 1341 and the optical engine 12. The use of the rectangular adhesive layer ensures the seamless connection between the optical engine 12 and the transparent support 13, providing additional physical and chemical stability. The adhesive force of the adhesive layer enables the optical engine 12 to maintain accurate alignment with the waveguide sheet 11 even under vibration or temperature change, avoiding image distortion. This design significantly improves the reliability and consistency of the device, prolonging the service life. In other embodiments, different properties of glue, such as high light transmittance or high temperature resistant glue, can also be used to cope with different use conditions, such as outdoor high temperature or low light environment.

[0065] Further, the first and second adhesive layers 14 and 15 are UV adhesive layers, and the transparent support 13 is made of PMMA material. The selection of UV adhesive layers and the use of PMMA material form the basis of the high performance of the device. UV adhesive layers are cured under ultraviolet radiation to form high-strength bonding, and PMMA material has good light transmission and mechanical strength, making it an ideal support material for optical components. This design ensures the secure connection of internal components and efficient transmission of the optical path, improving overall reliability and visual effects. In other embodiments, other types of curing adhesives or transparent materials such as epoxy resin or polycarbonate can be used to meet specific use environment or cost control requirements, such as higher temperature stability or lower production cost.

[0066] Further, as shown in Figure 4 , the transparent support 13 is arranged at the edge of the waveguide sheet 11, and the surface of the transparent support 13 facing the waveguide sheet 11 is the second surface 132; the second surface 132 has a positioning groove 1331, and the edge of the waveguide sheet 11 is clamped in the positioning groove 1331. The edge positioning design of the transparent support 13 ensures the correct alignment of the waveguide sheet 11.

[0067] Further, as shown in Figures 4 to 6 , the transparent support 13 has a through hole 135, and the light from the light machine 12 is projected out of the through hole 135. The design of the through hole 135 allows the light emitted by the light machine 12 to directly penetrate the transparent support 13, reducing unnecessary light path turning and improving light efficiency. The position and size of the through hole 135 need to be accurately calculated to ensure the coupling efficiency of the light and the waveguide sheet 11, while avoiding the absorption and scattering of the support material to the light. This design optimizes the layout of the optical path, reduces power consumption, and improves the energy efficiency ratio of the device. In other embodiments, the number of through holes 135 can be increased or their shape can be changed to support multi-angle or wide-field image display, meeting the needs of more application scenarios.

[0068] Further, as shown in Figure 5 and Figure 6 , the transparent support 13 includes a support body 133 and a limiting block 134, the support body 133 is arranged on the waveguide sheet 11, and the support body 133 has a through hole 135; the limiting block 134 is arranged on the support body 133, and the through hole 135 penetrates the limiting block 134; wherein the light machine 12 is arranged on the limiting block 134. The combined design of the support body 133 and the limiting block 134 ensures the precise positioning of the light machine 12 and the efficient transmission of the light. The technical solution in this embodiment realizes the dual improvement of structural stability and optical efficiency, enhancing the overall competitiveness of the device. In other embodiments, the material of the limiting block 134 or the diameter of the through hole 135 can be adjusted to improve the heat dissipation performance or improve the compatibility of the light machine 12, further expanding the application field of the device.

[0069] Further, the limiting block 134 is a rectangular limiting block 134, and the limiting block 134 has a limiting groove 1341 on the side facing the light engine 12, and the light engine 12 is used to be clamped in the limiting groove 1341. The combination of the rectangular limiting block 134 and the limiting groove 1341 provides a precise installation reference for the light engine 12, which helps to improve the assembly accuracy and speed of the device. The shape and size of the limiting groove 1341 need to match the interface of the light engine 12 to ensure the continuity and stability of the optical path between the light engine 12 and the waveguide sheet 11. This design not only simplifies the assembly process, but also enhances the connection strength of the light engine 12 and the bracket, and improves the durability and stability of the device. In other embodiments, by changing the thickness of the limiting block 134 or the depth of the limiting groove 1341, different power or size of the light engine 12 can be adapted to achieve wider compatibility and higher flexibility.

[0070] Further, the limiting block 134 is a wedge-shaped limiting block 134. The design of the wedge-shaped limiting block 134 provides an angle adjustment between the light engine 12 and the waveguide sheet 11, which helps to optimize the angle and position of image display. The wedge-shaped limiting block 134 realizes the fine adjustment of the optical path by the contact of its inclined surface with the light engine 12, to adapt to the visual needs of different users. This design improves the ergonomics of the device, so that users can obtain a more comfortable visual experience when wearing. In other embodiments, by adjusting the slope or material hardness of the wedge-shaped limiting block 134, more precise angle adjustment or improved stability for long-term use can be achieved to meet the needs of the high-end market.

[0071] In another embodiment, the waveguide sheet is two pieces, and the light engine is two, and the two light engines are respectively corresponding to the two waveguide sheets and are oppositely arranged, and the two waveguide sheets are respectively arranged opposite to a pair of eyes of a user.

[0072] In addition, the assembling method of the optical engine 12 can include the following steps: firstly, a transparent support 13 is arranged between the optical engine 12 and the waveguide sheet 11, the transparent support 13 is provided with a first surface 131 facing the side of the optical engine 12 and a second surface 132 facing the side of the waveguide sheet 11. During assembly, the outer contour of the optical engine 12 is embedded into a limiting groove 1341 on the first surface 131, the limiting groove 1341 and the outer contour of the optical engine 12 are matched with each other to achieve accurate positioning; at the same time, the edge of the waveguide sheet 11 is clamped into a positioning groove 1331 on the second surface 132 to obtain stable support. Subsequently, a first glue layer is filled between the optical engine 12 and the limiting groove 1341, a second glue layer is filled between the waveguide sheet 11 and the positioning groove 1331, and the first glue layer and the second glue layer are cured in a state of ensuring that the light emitted by the optical engine 12 and the light path of the incident end of the waveguide sheet 11 are accurately aligned, and the specific curing method can be photocuring, so as to firmly fix the optical engine 12 and the waveguide sheet 11 on the transparent support 13, and realize high-precision and stable optical coupling.

[0073] In combination with the above-mentioned contents of the embodiment module, in the working process of the augmented reality device of the present application, firstly, the optical engine 12 generates light rays of a virtual image, and the light rays are accurately coupled to the waveguide sheet 11 through an optimally designed optical system. The waveguide sheet 11 guides the light rays to the eyes of a user by using the principle of total reflection to form a clear virtual image. In this process, the transparent support 13 not only provides a stable support structure, but also ensures the accurate positions of the optical engine 12 and the waveguide sheet 11 through the limiting groove 1341 and the positioning groove 1331, thereby avoiding image distortion. The use of the first glue layer 14 and the second glue layer further strengthens the connection between components and ensures the continuity of the light path and the reliability of the device. In addition, the design of the through hole 135 and the limiting block 134 on the transparent support 13 optimizes the layout of the light path, improves the light efficiency, and at the same time provides accurate installation and angle adjustment functions of the optical engine 12, thereby enhancing the comfort and applicability of the device. The entire working process embodies the comprehensive advantages of the present technical solution in terms of structural design, optical performance and user experience.

[0074] The present application also provides an assembling method of an optical engine, which includes the following steps:

[0075] The transparent support 13 is arranged between the waveguide sheet 11 and the optical engine 12, and the transparent support 13 has a first surface 131 facing the side of the optical engine 12 and a second surface 132 facing the side of the waveguide sheet 11;

[0076] The outer contour of the optical engine 12 is embedded into a limiting groove 1341 on the first surface 131, and the limiting groove 1341 and the outer contour of the optical engine 12 are matched with each other;

[0077] The edge of the waveguide sheet 11 is clamped into a positioning groove 1331 on the second surface 132.

[0078] A first glue layer is filled between the light machine 12 and the limiting groove 1341, and a second glue layer is filled between the waveguide sheet 11 and the positioning groove 1331;

[0079] And the first glue layer and the second glue layer are cured in the case of aligning the light emitted by the light machine 12 with the light path of the incident end of the waveguide sheet 11, so as to fix the light machine 12 and the waveguide sheet 11 to the transparent support 13.

[0080] In summary, the augmented reality device provided in the application introduces an innovative scheme of fixing the transparent support 13 and the double UV glue layer in the structural design, which has significant technical advantages compared with the mechanical buckle support structure adopted by some technical schemes and the screw and gasket structure adopted by some technical schemes.

[0081] Firstly, in terms of optical performance, the transparent support 13 is made of PMMA material with high light transmittance and low refractive index, which not only avoids the shielding and scattering of the light emitted by the light machine 12 by the metal or opaque support 13, but also significantly reduces the interference of stray light and improves the image clarity. At the same time, the through hole 135 is designed on the support body 133 or the limiting block 134, so that the light emitted by the light machine 12 can reach the waveguide sheet 11 without shielding, completely eliminating the light loss problem caused by physical shielding in the traditional structure.

[0082] Secondly, in terms of precise positioning and stability, the limiting groove 1341 which accurately matches the outer contour of the light machine 12 is arranged on the side of the light machine 12 of the transparent support 13, which can be rectangular or wedge-shaped structure, realizing micron-level positioning; the positioning groove 1331 arranged on the side of the waveguide sheet 11 ensures that the waveguide sheet 11 will not displace horizontally after being clamped. This double-sided limiting design effectively avoids the assembly tolerance problem of the buckle structure in some technical schemes and the optical deviation phenomenon caused by the pre-tightening force of the screw in some technical schemes. Especially the wedge-shaped limiting block 134 structure can support the fine adjustment of the angle of the light machine 12 during the fixing process, thereby further optimizing the light incidence angle, which is difficult to achieve in traditional rigid supports.

[0083] Thirdly, the application has significant advantages in structural lightweight and compactness. The transparent support 13 replaces the metal buckle or screw components, and the overall weight is reduced by about 30%, which is more in line with the development trend of light and thin AR glasses. At the same time, the support is cleverly arranged at the edge position of the waveguide sheet 11, which not only saves space, but also avoids the shielding of the user's field of view by large supports, which is in sharp contrast to the support in the comparative document 1 which occupies a significant optical path space.

[0084] Under the cooperation of the transparent support 13 and the double UV glue layer, the application realizes stress management of "rigidity and flexibility combined": the transparent support 13 provides rigid support and resists macro displacement through the limiting structure, while the UV glue layer forms an elastic interface to absorb vibration and thermal stress, and the thermal expansion coefficients of the two are matched, so that the fixed structure remains stable in the environment range of-40 to 85 degrees Celsius. Compared with the screw and gasket structure of some technical solutions, the application avoids the problem of buffer invalidation caused by gasket aging, and the reliability under vibration conditions is significantly improved.

[0085] In terms of assembly process, the application adopts the strategy of "calibration first and curing later", first realizes the preliminary positioning of the light machine 12 and the waveguide sheet 11 by the support, then performs accurate fine tuning of the optical path in the liquid state of the UV glue layer, and finally locks the position through ultraviolet curing. This method not only guarantees the positioning accuracy, but also improves the assembly efficiency, is suitable for automatic production, and greatly reduces the process complexity compared with the traditional mechanical fixed repeated disassembly and manual adjustment mode.

[0086] In summary, the transparent support 13 of the application not only bears the role of physical connection, but also realizes integrated innovation in the aspects of optical optimization, structural stability and assembly process. On the optical level, through the PMMA material and the through hole 135 design, nearly lossless optical path transmission is realized; on the mechanical level, through the limiting groove 1341 and the positioning groove 1331 structure, the long-standing problem of "micro displacement leading to image drift" in the AR industry is effectively solved; on the process level, through the modular support cooperating with the UV glue fixation, high-precision automatic assembly is supported. Therefore, while maintaining the ultra-thin AR glasses, the application significantly improves the coupling accuracy, image stability and environmental adaptability of the light machine 12 and the waveguide sheet 11, realizes the generational leap compared with the prior art, makes the AR device more portable and comfortable, and is suitable for long-term wearing, expands its application scenarios in the fields of education, entertainment, industrial guidance and the like, and significantly improves the interactivity and immersion.

[0087] Those skilled in the art can understand that the above embodiments are specific examples for implementing the application, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the application.

Claims

1. An augmented reality device, characterized in that, include: Eyeglass frames; A waveguide sheet is disposed on the eyeglass frame and positioned opposite to the user's eyes; the waveguide sheet is used to project virtual images. An optical engine is disposed opposite to the waveguide sheet and close to the temple of the eyeglasses frame. The optical engine is used to generate and project virtual images and couple the image light to the waveguide sheet through an optical system. A transparent support is disposed between the waveguide sheet and the optomechanical system; A first adhesive layer is disposed between the optical engine and the transparent bracket to fix the optical engine and the transparent bracket. The second adhesive layer is disposed between the waveguide sheet and the transparent bracket to fix the waveguide sheet and the transparent bracket. Specifically, after filling the first adhesive layer between the optical engine and the transparent bracket, and filling the second adhesive layer between the waveguide sheet and the transparent bracket, the output light of the optical engine and the incident light path of the waveguide sheet are aligned. After aligning the optical path, the first and second adhesive layers are cured to fix the optical engine and the waveguide sheet to the transparent bracket.

2. The augmented reality device according to claim 1, characterized in that, The surface of the transparent bracket facing the optical engine is the first surface; The first surface has a limiting groove, and the outer contour of the connection part between the optical engine and the limiting groove matches the inner contour of the limiting groove.

3. The augmented reality device according to claim 1, characterized in that, The limiting groove is a rectangular groove, and the outer contour of the connection between the optical engine and the limiting groove is rectangular.

4. The augmented reality device according to claim 1, characterized in that, The transparent support is disposed on the edge of the waveguide sheet, and the surface of the transparent support facing the waveguide sheet is the second surface; The second surface has a positioning groove, and the edge of the waveguide sheet is engaged in the positioning groove.

5. The augmented reality device according to claim 1, characterized in that, The transparent support has a through hole through which the light from the optical engine is projected. Alternatively, there are two waveguide sheets and two optical engines, each corresponding to one of the two waveguide sheets and arranged opposite to each other. The two waveguide sheets are respectively arranged opposite to a pair of eyes of the user.

6. The augmented reality device according to claim 1, characterized in that, The transparent support includes: A support body is disposed on the waveguide sheet, and the support body has through holes; A limiting block is disposed on the bracket body, and the through hole penetrates the limiting block; The optical engine is mounted on the limiting block.

7. The augmented reality device according to claim 6, characterized in that, The limiting block is a rectangular limiting block, and the limiting block has a limiting groove on the side facing the optical engine, and the optical engine is used to be snapped into the limiting groove.

8. The augmented reality device according to claim 6, characterized in that, The limiting block is a wedge-shaped limiting block.

9. The augmented reality device according to claim 1, characterized in that, The first adhesive layer and the second adhesive layer are UV adhesive layers; Or, the transparent bracket is made of PMMA material; Alternatively, the augmented reality device may also include eyeglass lenses disposed on the eyeglass frame.

10. A method for assembling an optical engine, characterized in that, Includes the following steps: A transparent support is disposed between the waveguide sheet and the optomechanism, the transparent support having a first surface facing the side of the optomechanism and a second surface facing the side of the waveguide sheet; The outer contour of the optical engine is embedded in the limiting groove on the first surface, and the limiting groove matches the outer contour of the optical engine. The edge of the waveguide sheet is snapped into the positioning groove on the second surface; A first adhesive layer is filled between the optical engine and the limiting groove, and a second adhesive layer is filled between the waveguide sheet and the positioning groove; The first and second adhesive layers are cured while aligning the output light of the optical engine with the incident light of the waveguide plate to fix the optical engine and the waveguide plate to the transparent bracket.

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