Optical module and augmented reality glasses

Abstract

An optical module (100), comprising a first lens (20), an optical waveguide element (10) and a second lens (30) which are successively stacked, and a fixing frame (40a, 40b, 40c) and position-limiting elements. The fixing frame (40a, 40b, 40c) is at least connected to an edge portion of the optical waveguide element (10). The position-limiting elements are arranged on the side of the fixing frame facing the optical waveguide element. The optical module (100) further comprises a packaging adhesive or a locking element (81, 82) provided on the fixing frame (40a, 40b, 40c). The packaging adhesive or the locking element (81, 82) is matched with the position-limiting elements and the fixing frame (40a, 40b, 40c), so as to fix the first lens (20), the optical waveguide element (10) and the second lens (30) integrally. The optical module (100) can effectively avoid difficulties and problems during a gluing process caused by using the packaging adhesive to bond various components of the optical module (100), and improve the assembly efficiency of the optical module (100). Also provided are augmented reality glasses (400) comprising the optical module (100).

Description

Optical modules and augmented reality glasses Technical Field

[0001] This application relates to the field of optics, and more particularly to an optical module and augmented reality glasses including the optical module. Background Technology

[0002] Existing optical modules typically use optical adhesive to bond optical components together to achieve the optical design specifications of the optical components. When using optical adhesive for bonding, the difference in refractive index between the optical components and the optical adhesive must be considered, and the process environment and bonding accuracy must be strictly controlled during the bonding process.

[0003] Compared to the bonding process of solid transparent optical adhesives, the bonding process of liquid transparent optical adhesives is relatively more complex. Both solid and liquid transparent optical adhesives require high precision, uniformity, and a bubble-free bonding process to achieve a seamless bond. During the bonding process, differences between the optical adhesive and the optical components can cause defects such as bubbles, insufficient adhesive, wrinkles, particles, bending, uneven surfaces, and inability to rework, all of which may affect the final optical performance of the optical module. Summary of the Invention

[0004] In view of this, this application provides an optical module that does not rely solely on optical adhesive to bond the various components of the optical module, thus avoiding the difficulties and problems of the adhesive bonding process and improving the assembly efficiency and yield of the product.

[0005] An optical module includes:

[0006] The first lens, the optical waveguide element, and the second lens are stacked in sequence.

[0007] A fixed frame is provided, at least connecting the edge portion of the optical waveguide element;

[0008] A limiting element is disposed on the side of the fixing frame facing the optical waveguide element; and

[0009] An encapsulating adhesive or locking element is disposed on the fixed frame. The encapsulating adhesive or locking element cooperates with the limiting element and the fixed frame to fix the first lens, the optical waveguide element and the second lens as a whole.

[0010] The optical module of this application embodiment fixes the first lens, the optical waveguide element and the second lens stacked in sequence into one unit by setting a fixed frame, a limiting element and one of the encapsulating adhesive and locking elements working together. This effectively avoids the difficulties and problems in the bonding process caused by using adhesives such as encapsulating adhesive to bond the various components of the optical module, and improves the assembly efficiency of the optical module.

[0011] In some embodiments, the optical module includes the encapsulating adhesive;

[0012] The fixed frame connects the first lens, the optical waveguide element, and the edge of the second lens;

[0013] The limiting element includes a limiting part, which is fixed to the fixed frame by the encapsulating adhesive.

[0014] The fixed frame is provided with a baffle corresponding to the first lens. The first lens, the optical waveguide element and the second lens are stacked in sequence and sandwiched between the baffle and the limiting part. The connection area between the baffle and the first lens is provided with the encapsulating adhesive, and the connection area between the limiting part and the second lens is provided with the encapsulating adhesive.

[0015] In some embodiments, the surface of the stop edge facing the first lens matches the shape of the surface of the first lens facing away from the optical waveguide element, so that the edge of the first lens is attached to the stop edge;

[0016] The surface of the limiting part facing the second lens matches the shape of the surface of the second lens away from the optical waveguide element, so that the edge of the second lens is attached to the limiting part.

[0017] In some embodiments, the limiting element further includes a first spacer ring and a second spacer ring, wherein the first spacer ring is disposed between the optical waveguide element and the first lens, and the second spacer ring is disposed between the optical waveguide element and the second lens.

[0018] In some embodiments, the encapsulating adhesive is disposed in the connection area between the first spacer ring and the optical waveguide element, and in the connection area between the first spacer ring and the first lens;

[0019] The encapsulating adhesive is disposed in the connection area between the second spacer ring and the optical waveguide element, and in the connection area between the second spacer ring and the second lens.

[0020] In some embodiments, the optical module includes the locking element;

[0021] The fixed frame includes a first frame part and a second frame part that are rotatably connected. One end of the first frame part and one end of the second frame part are connected, and the other end of the first frame part and the other end of the second frame part are connected by the locking element.

[0022] The first frame portion and the second frame portion together surround the periphery of the first lens, the optical waveguide element, and the second lens.

[0023] In some embodiments, the limiting element is respectively provided on the first frame portion and the second frame portion, the limiting element including a first retaining portion and a second retaining portion spaced apart from each other, and the edge portion of the optical waveguide element is sandwiched between the first retaining portion and the second retaining portion.

[0024] In some embodiments, the limiting element further includes a third holding portion, which is located on the side of the first holding portion away from the second holding portion, and the third holding portion is spaced apart from the first holding portion;

[0025] The edge of the first lens is sandwiched between the first retaining portion and the third retaining portion, and the first retaining portion is sandwiched between the first lens and the optical waveguide element.

[0026] In some embodiments, the limiting element further includes a fourth holding portion, which is located on the side of the second holding portion away from the first holding portion, and the fourth holding portion is spaced apart from the first holding portion;

[0027] The edge of the second lens has a slot, which cooperates with the fourth holding part. The fourth holding part extends into the slot, and the second holding part is clamped between the second lens and the optical waveguide element.

[0028] In some embodiments, the optical module includes the locking element;

[0029] The fixed frame includes a separate first frame portion and a second frame portion, the first frame portion and the second frame portion being located at opposite ends of the optical waveguide element, and the optical waveguide element being sandwiched between the first frame portion and the second frame portion;

[0030] The locking element includes a first locking element and a second locking element. The first locking element locks the first lens, the first frame portion and the second lens into one unit, and fixes the first frame portion between the first lens and the second lens. The second locking element locks the first lens, the second frame portion and the second lens into one unit, and fixes the second frame portion between the first lens and the second lens.

[0031] In some embodiments, the first locking element includes a screw or nut and a nut, the screw or nut passing through the first lens, the first frame portion and the second lens, and the nut locking the end of the screw or nut, thereby locking the first lens, the first frame portion and the second lens together;

[0032] The second locking element includes a screw or nut and a nut, the screw or nut passing through the first lens, the second frame portion and the second lens, and the nut locking the end of the screw or nut, thereby locking the first lens, the second frame portion and the second lens together.

[0033] In some embodiments, the first frame portion and the second frame portion are respectively provided with retaining grooves, and the opposite ends of the edge portion of the optical waveguide element are respectively limited in the retaining grooves of the first frame portion and the retaining grooves of the second frame portion.

[0034] This application also provides augmented reality glasses, including a projection system and the aforementioned optical module, wherein the projection system is used to generate a light beam that is projected onto the optical module. Attached Figure Description

[0035] Figure 1 is a schematic diagram of the optical module of Embodiment 1 of this application.

[0036] Figure 2 is a schematic diagram of the assembly of the optical module in Figure 1.

[0037] Figure 3 is a side view of the optical module of Embodiment 2 of this application.

[0038] Figure 4 is a top view of the optical module of Embodiment 2 of this application.

[0039] Figure 5 is a schematic diagram of two states of the fixed frame of the optical module in Embodiment 2 of this application.

[0040] Figure 6 is a schematic diagram of the assembly of the optical module in Figure 3.

[0041] Figure 7 is a schematic diagram of the optical module of Embodiment 3 of this application.

[0042] Figure 8 is a schematic diagram of the assembly of the optical module in Figure 7.

[0043] Figure 9 is a schematic diagram of the modules of the augmented reality glasses according to an embodiment of this application.

[0044] Key component symbols: Optical modules 100, 200, 300; first lens 20; optical waveguide element 10; second lens 30; fixed frames 40a, 40b, 40c; first spacer ring 61a; second spacer ring 61b; edge 41; limiting part 63; substrate 11; grating 13; first frame part 42a, 44a; second frame part 42b, 44b; locking elements 70, 80; first holding part 62; second holding part 64; third holding part 66; fourth holding part 68; locking block part 21; slot 31; through holes 22, 442, 32; first locking element 81; second locking element 82; augmented reality glasses 400; projection system 420. Detailed Implementation

[0045] The optical module of this application embodiment fixes the first lens, the optical waveguide element and the second lens stacked in sequence into one unit by setting a fixed frame, a limiting element and one of the encapsulating adhesive and locking elements. This effectively avoids the difficulties and problems caused by using encapsulating adhesive to bond the various components of the optical module, and improves the assembly efficiency.

[0046] Example 1

[0047] Embodiment 1 of this application provides an optical module. By setting a fixed frame and using limiting elements and encapsulating adhesive, the various components of the optical module can be fixed together quickly and accurately. This effectively avoids the difficulties and problems in the bonding process caused by using encapsulating adhesive to bond the various components of the optical module, and improves efficiency.

[0048] As shown in Figure 1, the optical module 100 includes a first lens 20, an optical waveguide element 10, and a second lens 30 stacked sequentially and spaced apart from each other. The optical module 100 also includes a fixing frame 40a, which is used to limit the first lens 20, the optical waveguide element 10, and the second lens 30. The fixing frame 40a is disposed at the edge of the first lens 20, the optical waveguide element 10, and the second lens 30, and is connected to the edge ends of the first lens 20, the optical waveguide element 10, and the second lens 30.

[0049] As shown in Figure 1, in this embodiment of the application, the first lens 20 is a convex lens with one side being convex and the other side being flat, wherein the convex side faces away from the optical waveguide element 10; the second lens 30 is a concave lens with one side being concave and the other side being flat, wherein the concave side faces away from the optical waveguide element 10.

[0050] As shown in Figure 1, the optical module also includes limiting elements disposed on the fixed frame 40a. These limiting elements include spacer rings disposed on opposite sides of the optical waveguide element 10, namely a first spacer ring 61a and a second spacer ring 61b. The first spacer ring 61a is sandwiched between the optical waveguide element 10 and the first lens 20, and is located at the edge portions of both the optical waveguide element 10 and the first lens 20. The second spacer ring 61b is sandwiched between the optical waveguide element 10 and the second lens 30, and the first spacer ring 61a is located at the edge portions of both the optical waveguide element 10 and the second lens 30. Thus, the first spacer ring 61a ensures an appropriate distance between the optical waveguide element 10 and the first lens 20; the second spacer ring 61b ensures an appropriate distance between the optical waveguide element 10 and the second lens 30.

[0051] Understandably, the thickness of the first spacer ring 61a between the optical waveguide element 10 and the first lens 20 can be designed based on the focal lengths of the optical waveguide element 10 and the first lens 20, and the thickness of the second spacer ring 61b between the optical waveguide element 10 and the second lens 30 can be designed based on the focal lengths of the optical waveguide element 10 and the second lens 30. In this embodiment, both the first spacer ring 61a and the second spacer ring 61b are extended into a ring shape, but this is not a limitation. For example, the first spacer ring 61a can also be configured as two separate parts, located at opposite ends of the first lens 20, and the second spacer ring 61b can also be configured as two separate parts, located at opposite ends of the second lens 30.

[0052] In this embodiment, the fixing frame 40a is provided with a baffle 41 to limit the first lens 20. Since the surface of the first lens 20 facing away from the optical waveguide element 10 is convex, the surface of the baffle 41 facing the first lens 20 is set as an arc-shaped curved surface to cooperate with the convex surface of the first lens 20. In this way, the edge of the convex surface of the first lens 20 can be attached to the curved surface of the baffle 41, limiting the edge of the first lens 20. In this embodiment, the fixing frame 40a and the baffle 41 are integrally formed, but this is not a limitation.

[0053] Understandably, the surface of the first lens 20 facing away from the optical waveguide element 10 is not limited to a convex surface, but can also be a concave surface, an aspherical surface, or a freeform surface. In short, the surface of the baffle 41 of the fixing frame 40a facing the first lens 20 is designed to match the surface of the first lens 20 facing away from the optical waveguide element 10, so that the first lens 20 can be attached to the baffle 41.

[0054] In other embodiments, the edge portion of the first lens 20 that contacts the edge 41 of the fixed frame 40a is the non-visible area of ​​the first lens 20. Therefore, regardless of the type of surface of the first lens 20 facing away from the optical waveguide element 10, the surface of the edge portion of the first lens 20 can be processed into a plane, and the surface of the edge 41 of the fixed frame 40a facing the first lens 20 is also designed to be a plane.

[0055] In this embodiment, the limiting element further includes a limiting portion 63 disposed on the fixed frame 40a to limit the second lens 30. As shown in FIG1, since the surface of the second lens 30 facing away from the optical waveguide element 10 is concave, the surface of the limiting portion 63 facing the second lens 30 is set as an arc-shaped curved surface to cooperate with the concave surface of the second lens 30. In this way, the edge of the concave surface of the second lens 30 can be attached to the curved surface of the limiting portion 63 to limit the edge of the second lens 30.

[0056] Understandably, the surface of the second lens 30 facing away from the optical waveguide element 10 is not limited to a concave surface, but can also be a convex surface, an aspherical surface, or a freeform surface. In short, the surface of the limiting part 63 facing the second lens 30 is designed to cooperate with the surface of the second lens 30 facing away from the optical waveguide element 10, thereby limiting the second lens 30.

[0057] In other embodiments, the edge portion of the second lens 30 that contacts the limiting portion 63 is the non-visible area of ​​the second lens 30. Therefore, regardless of the type of surface of the second lens 30 facing away from the optical waveguide element 10, the surface of the edge portion of the second lens 30 can be set as a plane, and the surface of the limiting portion 63 facing the second lens 30 is also designed as a plane.

[0058] Thus, through the cooperation of the fixed frame 40a and the limiting part 63, the first lens 20, the first spacer ring 61a, the optical waveguide element 10, the second spacer ring 61b, and the second lens 30, which are stacked in sequence, are limited between the stop edge 41 of the fixed frame 40a and the limiting part 63. Furthermore, the first lens 20 is sandwiched between the stop edge 41 of the fixed frame 40a and the first spacer ring 61a, the second lens 30 is sandwiched between the limiting part 63 and the second spacer ring 61b, and the optical waveguide element 10 is sandwiched between the first spacer ring 61a and the second spacer ring 61b.

[0059] Understandably, the optical module 100 also includes encapsulating adhesive (not shown in Figure 1). The encapsulating adhesive can be disposed between the fixed frame 40a and the limiting part 63, fixing the limiting part 63 to the fixed frame 40a. The encapsulating adhesive can also be disposed in the connection areas of the optical waveguide element 10 with the first lens 20 and the fixed frame 40a, the connection areas of the first spacer ring 61a with the optical waveguide element 10 and the fixed frame 40a, the connection areas of the optical waveguide element 10 with the first lens 20 and the fixed frame 40a, the connection areas of the second spacer ring 61b with the optical waveguide element 10 and the fixed frame 40a, the connection areas of the optical waveguide element 10 with the second lens 30 and the fixed frame 40a, and the connection area of ​​the limiting part 63 with the optical waveguide element 10. The encapsulating adhesive effectively increases the bonding strength between the first lens 20, the optical waveguide element 10, the second lens 30, and the spacer rings.

[0060] In some embodiments, the fixing frame 40a includes a separate first frame portion and a second frame portion. The first frame portion and the second frame portion are respectively located at opposite ends of the stacked first lens 20, optical waveguide element 10, and second lens 30. The first frame portion and the second frame portion each have a retaining edge 41.

[0061] In other embodiments, the fixing frame 40a is a cylindrical shape that surrounds the periphery of the first lens 20, the optical waveguide element 10, and the second lens 30 that are stacked together, and a baffle 41 extends from the inner wall of the fixing frame 40a.

[0062] Understandably, the limiting part 63 includes two separate parts located at opposite ends of the second lens 30, or the limiting part 63 may extend into a ring shape to cover the non-visible area of ​​the edge portion of the second lens 30.

[0063] Referring to Figure 2, the assembly and fixing method of the optical module 100 includes:

[0064] The first lens 20 is placed on the fixed frame 40a, and the edge of the first lens 20 is in close contact with the edge 41 of the fixed frame 40a. Before placing the first lens 20, adhesive can be applied to the connection area between the first lens 20 and the fixed frame 40a. The elliptical area in Figure 2 represents the area of ​​adhesive application, but is not limited thereto.

[0065] Place the first spacer ring 61a on the first lens 20 and connect the edge of the first spacer ring 61a to the fixing frame 40a. Before placing the first spacer ring 61a, local glue can be applied to the connection area between the first spacer ring 61a and the first lens 20 and the fixing frame 40a.

[0066] The optical waveguide element 10 is placed on the first spacer ring 61a and the edge end of the optical waveguide element 10 is connected to the fixing frame 40a. Before placing the optical waveguide element 10, local adhesive can be applied to the connection area between the optical waveguide element 10 and the first spacer ring 61a and the fixing frame 40a.

[0067] The second spacer ring 61b is placed on the optical waveguide element 10 and the edge end of the spacer ring is connected to the fixing frame 40a. Before placing the second spacer ring 61b, local adhesive can be applied to the connection area between the second spacer ring 61b and the optical waveguide element 10 and the fixing frame 40a.

[0068] The second lens 30 is placed on the second spacer ring 61b, and the edge of the second lens 30 is connected to the fixing frame 40a. Before placing the second lens 30, local adhesive can be applied to the connection area between the second lens 30 and the second spacer ring 61b and the fixing frame 40a.

[0069] The limiting part 63 is placed on the second lens 30. The edge of the concave surface of the second lens 30 is in close contact with the curved surface of the limiting part 63, and the edge end of the limiting part 63 is connected to the fixing frame 40a. Before placing the limiting part 63, local glue can be applied to the connection area between the limiting part 63, the second lens 30, and the fixing frame 40a.

[0070] In some embodiments, the first lens 20 and the second lens 30 are both optical prescription lenses with adjustable focal lengths according to user needs, optical lenses with other functions, or optical lens groups containing at least two lenses. In the embodiments of this application, the first lens 20 and the second lens 30 are both optical prescription lenses with adjustable focal lengths.

[0071] Thus, the first lens 20, the optical waveguide element 10, and the second lens 30 are limited on the fixed frame 40a, and through the cooperation of the edge 41, the limiting part 63, the first spacer ring 61a, the second spacer ring 61b, and the encapsulating adhesive with the edge portions of the first lens 20, the optical waveguide element 10, and the second lens 30, the first lens 20, the optical waveguide element 10, and the second lens 30 can be firmly held on the fixed frame 40a.

[0072] In some embodiments, the optical waveguide element 10 can be a geometric optical waveguide or a diffractive optical waveguide. Diffractive optical waveguide technology is further divided into surface relief grating waveguides and volume holographic grating waveguides. Diffractive optical waveguides utilize the diffraction effect of light, primarily employing grating structures to modulate the light beam. The fabrication principle of volume holographic optical waveguides is relatively simple; the grating structure can be formed using laser interference exposure.

[0073] Surface relief gratings are periodic structures created by etching peaks and valleys on a material surface using processes such as photolithography and etching, thereby achieving the desired optical performance. In some embodiments, as shown in Figure 1, the optical waveguide element 10 is a grating waveguide, comprising a substrate 11 and a grating 13 disposed on one surface of the substrate 11. Although not shown, the grating may include an input grating and an output grating, both of which are surface relief gratings. The characteristic size of the grating is on the nanometer scale, comparable to the wavelength of light, and light undergoes multi-order diffraction after incident on the grating. The input and output gratings each include multiple optical microstructures (not shown) protruding from the substrate and spaced apart from each other. Each optical microstructure is columnar, with a size on the nanometer scale. In some embodiments, the height of the optical microstructure is 80nm-200nm, for example, 80nm-120nm. The light emitted by the micro-projection system (optical engine) enters the substrate of the optical waveguide element 10 through the coupling grating, and is propagated by total internal reflection. Finally, the light is transmitted to the human eye by the output grating.

[0074] In some embodiments, the material of the fixing frame 40a may be metal, plastic (e.g., phenolic plastic) or rubber.

[0075] In some embodiments, the encapsulant may be a liquid encapsulant with properties such as high temperature resistance, high chemical resistance, and high resistance.

[0076] Example 2

[0077] Embodiment 2 of this application provides an optical module. By setting a fixing frame 40a with a holding part, the various components of the optical module can be fixed together quickly and accurately, effectively avoiding the difficulties and problems caused by using encapsulating adhesive to bond the various components of the optical module, and improving efficiency.

[0078] As shown in Figure 3, the optical module 200 includes a first lens 20, an optical waveguide element 10, and a second lens 30 stacked sequentially and spaced apart from each other. Referring to Figure 4, the optical module also includes a fixing frame 40b, which surrounds and limits the first lens 20, the optical waveguide element 10, and the second lens 30. The fixing frame 40a surrounds the periphery of the first lens 20, the optical waveguide element 10, and the second lens 30, and the inner wall of the fixing frame 40b is provided with limiting elements to limit the edges of the first lens 20, the optical waveguide element 10, and the second lens 30.

[0079] As shown in Figures 4 and 5, the fixed frame 40b includes a first frame portion 42a and a second frame portion 42b that are rotatably connected. The first frame portion 42a and the second frame portion 42b can be closed or opened relative to each other. In this embodiment, one end of the first frame portion 42a and one end of the second frame portion 42b are connected by a latch or hinge, and the other end of the first frame portion 42a and the other end of the second frame portion 42b are locked together by a locking element 70, such as a magnetic element. When the first frame portion 42a and the second frame portion 42b are closed, they form a closed loop. In this embodiment, the cross-sections of the first frame portion 42a and the second frame portion 42b are both semi-circular, but this is not a limitation.

[0080] It is understandable that the locking element 70 is not limited to a magnetic element, but can be other locking elements 70 as long as it can lock the first frame part 42a and the second frame part 42b into one unit, such as a locking element 70 with a buckle and a hole.

[0081] Referring to Figures 3 and 6, limiting elements are respectively provided on the inner walls of the first frame portion 42a and the second frame portion 42b to limit the edges of the first lens 20, the optical waveguide element 10, and the second lens 30. The limiting elements include a first retaining portion 62 and a second retaining portion 64 spaced apart from each other. The edge of the optical waveguide element 10 is limited between the first retaining portion 62 and the second retaining portion 64, and the distance between the first retaining portion 62 and the second retaining portion 64 is equal to the thickness of the edge of the optical waveguide element 10.

[0082] As shown in Figure 3, in this embodiment of the application, the first lens 20 is a convex lens with one side being convex and the other side being flat, wherein the convex side faces away from the optical waveguide element 10. The second lens 30 is a concave lens with one side being concave and the other side being flat, wherein the concave side faces away from the optical waveguide element 10.

[0083] Referring to Figures 3 and 6, the limiting element also includes a third holding part 66 and a fourth holding part 68. The third holding part 66 is located on the side of the first holding part 62 away from the second holding part 64, and the fourth holding part 68 is located on the side of the second holding part 64 away from the first holding part 62.

[0084] The edge of the first lens 20 is positioned between the first retaining portion 62 and the third retaining portion 66, and the distance between the first retaining portion 62 and the third retaining portion 66 is equal to the thickness of the edge of the first lens 20. As shown in FIG3, in this embodiment of the application, since the first lens 20 is a convex lens, in order to facilitate the positioning of the edge of the first lens 20 between the first retaining portion 62 and the third retaining portion 66, the edge portion of the first lens 20 can be partially removed to form a uniformly thick retaining block portion 21 located between the first retaining portion 62 and the third retaining portion 66.

[0085] The edge of the second lens 30 is provided with a slot 31, which cooperates with the fourth retaining part 68, which can extend into the slot 31. It can be understood that in order to cooperate with the fourth retaining part 68 on the first frame part 42a and the second frame part 42b, slots 31 are respectively provided at opposite ends of the second lens 30.

[0086] Understandably, the edge of the optical waveguide element 10, which is positioned between the first holding part 62 and the second holding part 64, is the non-visible area of ​​the optical waveguide element 10, the edge of the second lens 30 with the slot 31 is the non-visible area of ​​the second lens 30, and the edge of the first lens 20 is the non-visible area of ​​the first lens 20.

[0087] In this embodiment, the surface (plane) of the first lens 20 facing the optical waveguide element 10 is contacted and connected to the first retaining portion 62, such that the width of the first retaining portion 62 determines the distance between the first lens 20 and the optical waveguide element 10. The surface (plane) of the second lens 30 facing the optical waveguide element 10 is contacted and connected to the second retaining portion 64, such that the width of the second retaining portion 64 determines the distance between the second lens 30 and the optical waveguide element 10.

[0088] Thus, when the first frame portion 42a and the second frame portion 42b are locked together, the first lens 20, the optical waveguide element 10 and the second lens 30 are limited between the first frame portion 42a and the second frame portion 42b, and the first lens 20, the optical waveguide element 10 and the second lens 30 can be firmly held on the fixed frame 40b by the limiting element on the fixed frame 40b.

[0089] Referring to Figures 5 and 6, the assembly and fixing method of the optical module 200 according to an embodiment of this application includes:

[0090] The first lens 20, the optical waveguide element 10, and the second lens 30 are placed on the first frame portion 42a, with one end edge of the optical waveguide element 10 sandwiched between the first holding portion 62 and the second holding portion 64, one end edge of the first lens 20 sandwiched between the first holding portion 62 and the third holding portion 66, and the fourth holding portion 68 extending into the slot 31 at one end of the second lens 30.

[0091] Then, the second frame portion 42b is rotated to close onto the first frame portion 42a, and the locking element 70 secures the connection between the first frame portion 42a and the second frame portion 42b. At this time, the limiting element on the second frame portion 42b engages with and holds the other edges of the first lens 20, the optical waveguide element 10, and the second lens 30. Specifically, the other edge of the optical waveguide element 10 is sandwiched between the first holding part 62 and the second holding part 64, the other edge of the first lens 20 is located between the first holding part 62 and the third holding part 66, and the fourth holding part 68 extends into the slot 31 at the other end of the second lens 30. Thus, the first lens 20, the optical waveguide element 10, and the second lens 30 are securely held onto the fixed frame 40b.

[0092] In some embodiments, the material of the fixing frame 40a may be metal or plastic, but is not limited thereto.

[0093] Example 3

[0094] Embodiment 3 of this application provides an optical module. By setting a fixed frame and providing through holes in the fixed frame and lens to install locking elements, the various components of the optical module can be fixed together quickly and accurately. This effectively avoids the difficulties and problems caused by using encapsulating adhesive to bond the various components of the optical module, and improves efficiency.

[0095] As shown in Figure 7, the optical module 300 includes a first lens 20, an optical waveguide element 10, and a second lens 30 stacked sequentially and spaced apart from each other. The optical module also includes a fixing frame 40c, which is used to limit the optical waveguide element 10. The fixing frame 40c is located at the edge of the optical waveguide element 10 and is provided with a retaining groove 440 to receive the edge portion of the optical waveguide element 10, thereby limiting the optical waveguide element 10.

[0096] In some embodiments, the fixing frame 40c includes a separate first frame portion 44a and a second frame portion 44b. The first frame portion 44a and the second frame portion 44b are located at opposite ends of the optical waveguide element 10. The first frame portion 44a and the second frame portion 44b are respectively provided with retaining grooves 440, and the edge portion of the optical waveguide element 10 is confined in the retaining grooves 440 of the first frame portion 44a and the second frame portion 44b.

[0097] As shown in Figures 7 and 8, the first frame portion 42a and the second frame portion 42b are respectively provided with through holes 442. Correspondingly, the edges of the first lens 20 and the second lens 30 are respectively provided with through holes. The first lens 20 has two through holes 22 corresponding to the through holes 442 of the first frame portion 42a and the second frame portion 42b, respectively. The second lens 30 has two through holes 32 corresponding to the through holes 442 of the first frame portion 42a and the second frame portion 42b, respectively. The through holes 442 of the first frame portion 42a penetrate the first frame portion 42a along the stacking direction of the first lens 20, the optical waveguide element 10, and the second lens 30. The through holes 442 of the second frame portion 42b penetrate the second frame portion 42b along the stacking direction of the first lens 20, the optical waveguide element 10, and the second lens 30. The through holes 22 of the first lens 20 penetrate the first lens 20 along the stacking direction of the first lens 20, the optical waveguide element 10, and the second lens 30. The through hole 32 of the second lens 30 extends through the second lens 30 along the stacking direction of the first lens 20, the optical waveguide element 10, and the second lens 30.

[0098] As shown in Figures 7 and 8, the optical module also includes a locking element 80. The locking element 80 includes a first locking element 81 and a second locking element 82. The first locking element 81 locks the first lens 20, the first frame portion 42a, and the second lens 30 together, and the second locking element 82 locks the first lens 20, the second frame portion 42b, and the second lens 30 together. In this embodiment, the first locking element 81 and the second locking element 82 may respectively include a screw and a nut, or a bolt and a nut, etc. The two through holes 22 of the first lens 20 are respectively aligned with the through holes 442 of the first frame portion 42a and the second frame portion 42b, and the two through holes 32 of the second lens 30 are respectively aligned with the through holes 442 of the first frame portion 42a and the second frame portion 42b. The screw or bolt of the first locking element 81 passes sequentially through the through hole 22 of the first lens 20, the through hole 442 of the first frame portion 42a, and the through hole 32 of the second lens 30. Then, the nut of the first locking element 81 tightens both ends of the bolt or one end of the locking screw, thereby fixing the first frame portion 42a between the first lens 20 and the second lens 30. The screw or bolt of the second locking element 82 passes sequentially through the through hole 22 of the first lens 20, the through hole 442 of the second frame portion 42b, and the through hole 32 of the second lens 30. Then, the nut of the second locking element 82 tightens both ends of the bolt or one end of the locking screw, thereby fixing the second frame portion 42b between the first lens 20 and the second lens 30.

[0099] This allows for the sequential stacking and fixing of the first lens 20, the optical waveguide element 10, and the second lens 30. The diameter of the through hole 442 can be adjusted according to the dimensions of the first lens 20 and the second lens 30.

[0100] Understandably, the through holes 32 of the first lens 20 and the second lens 30 are both located in the non-visible area of ​​the edge portion. In some embodiments, considering the tolerable hole diameter position of the first lens 20 and the second lens 30 through processing, the diameter of the through hole 442 can be 3-5 mm.

[0101] Along the stacking direction of the first lens 20, the optical waveguide element 10, and the second lens 30, the width of the first frame portion 42a and the width of the second frame portion 42b are both equal to the distance between the first lens 20 and the second lens 30. The distance between the first lens 20 and the optical waveguide element 10, and the distance between the second lens 30 and the optical waveguide element 10 can be adjusted by adjusting the opening position of the retaining groove 440 on the first frame portion 42a and the second frame portion 42b.

[0102] The assembly and fixing method of the optical module 300 in this application embodiment includes:

[0103] The first frame portion 42a and the second frame portion 42b are respectively placed at opposite ends of the edge portion of the optical waveguide element 10, and the edge portion of the optical waveguide element 10 extends into the retaining groove 440 of the first frame portion 42a and the second frame portion 42b.

[0104] The first lens 20 is placed on one side of the first frame portion 42a and the second frame portion 42b, and the second lens 30 is placed on the other side of the first frame portion 42a and the second frame portion 42b respectively.

[0105] Align the two through holes 22 of the first lens 20 with the through holes 442 of the first frame portion 42a and the second frame portion 42b, respectively. Align the two through holes 32 of the second lens 30 with the through holes 442 of the first frame portion 42a and the second frame portion 42b, respectively. Pass a bolt or screw through the through holes 22 of the first lens 20, the through holes 442 of the first frame portion 42a and the through holes 32 of the second lens 30 in sequence. Then, use two nuts to lock the two ends of the bolt, or use one nut to lock the end of the screw. Pass another bolt or screw through the other through hole 22 of the first lens 20, the through hole 442 of the second frame portion 42b and the other through hole 32 of the second lens 30 in sequence. Then, use two nuts to lock the two ends of the bolt, or use one nut to lock the end of the screw.

[0106] Thus, the first lens 20, the first frame portion 42a, and the second lens 30 are locked together as one unit, and the first lens 20, the second frame portion 42b, and the second lens 30 are locked together as one unit. At this time, the first lens 20 is in contact with the first frame portion 42a and the second frame portion 42b, and the second lens 30 is in contact with the first frame portion 42a and the second frame portion 42b.

[0107] This application also provides an augmented reality (AR) glasses embodiment, which can overlay virtual images onto a real-world scene, allowing users to see a blend of virtual reality and the real world. As shown in FIG9, the AR glasses 400 includes the aforementioned optical modules 100 / 200 / 300 and a projection system 420. The projection system 420 is located on one side of the optical modules 100 / 200 / 300 to generate a light beam that is projected onto the optical modules 100 / 200 / 300.

[0108] Projection system 420 is used to generate a projected beam carrying image information. It can be an LCOS micro-projection system, DLP micro-projection system, OLED micro-projection system, Micro LED micro-projection system, LBS laser scanning micro-projection system, etc. LCOS and DLP micro-projection systems typically include a microdisplay LCOS or DMD, a backlight LED or laser, and optical lens assemblies. OLED and Micro LED micro-projection systems typically include a microdisplay OLED or Micro LED and optical lens assemblies. LBS laser scanning micro-projection systems typically include a laser light source, a collimation system, and scanning devices MEMS or scanning fibers. The beam generated by projection system 420 is propagated and extended by optical modules 100 / 200 / 300 before entering the human eye and being perceived.

[0109] In this embodiment, the projection system 420 is located on the side where the first lens 20 is disposed of in the optical waveguide element. Thus, the light from the projection system passes through the first lens 20, is guided by the optical waveguide element 10, and then passes through the second lens 30 before being projected into the viewer's eye.

[0110] The optical module of this application embodiment fixes the first lens 20, the optical waveguide element 10 and the second lens 30 stacked in sequence into one unit by setting a fixed frame, a limiting element and one of the encapsulating adhesive and locking elements working together. This effectively avoids the difficulties and problems in the bonding process caused by using adhesives such as encapsulating adhesive to bond the various components of the optical module, and improves the assembly efficiency of the optical module.

[0111] It should be noted that the above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features described in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical module, characterized in that: The optical module includes: The first lens, the optical waveguide element, and the second lens are stacked in sequence. A fixed frame is provided, at least connecting the edge portion of the optical waveguide element; A limiting element is disposed on the side of the fixing frame facing the optical waveguide element; and An encapsulating adhesive or locking element is disposed on the fixed frame. The encapsulating adhesive or locking element cooperates with the limiting element and the fixed frame to fix the first lens, the optical waveguide element and the second lens as a whole.

2. The optical module according to claim 1, characterized in that: When the optical module includes the encapsulating adhesive; The fixed frame connects the first lens, the optical waveguide element, and the edge of the second lens; The limiting element includes a limiting part, which is fixed to the fixed frame by the encapsulating adhesive. The fixed frame is provided with a baffle corresponding to the first lens. The first lens, the optical waveguide element and the second lens are stacked in sequence and sandwiched between the baffle and the limiting part. The connection area between the baffle and the first lens is provided with the encapsulating adhesive, and the connection area between the limiting part and the second lens is provided with the encapsulating adhesive.

3. The optical module according to claim 2, characterized in that: The surface of the baffle facing the first lens matches the shape of the surface of the first lens away from the optical waveguide element, so that the edge of the first lens is attached to the baffle. The surface of the limiting part facing the second lens matches the shape of the surface of the second lens away from the optical waveguide element, so that the edge of the second lens is attached to the limiting part.

4. The optical module according to claim 2, characterized in that: The limiting element further includes a first spacer ring and a second spacer ring, wherein the first spacer ring is sandwiched between the optical waveguide element and the first lens, and the second spacer ring is sandwiched between the optical waveguide element and the second lens.

5. The optical module according to claim 4, characterized in that: The encapsulating adhesive is disposed in the connection area between the first spacer ring and the optical waveguide element, and in the connection area between the first spacer ring and the first lens. The encapsulating adhesive is disposed in the connection area between the second spacer ring and the optical waveguide element, and in the connection area between the second spacer ring and the second lens.

6. The optical module according to claim 1, characterized in that: When the optical module includes the locking element; The fixed frame includes a first frame part and a second frame part that are rotatably connected. One end of the first frame part and one end of the second frame part are connected, and the other end of the first frame part and the other end of the second frame part are connected by the locking element. The first frame portion and the second frame portion together surround the periphery of the first lens, the optical waveguide element, and the second lens.

7. The optical module according to claim 6, characterized in that: The limiting element is respectively provided on the first frame portion and the second frame portion. The limiting element includes a first clamping portion and a second clamping portion that are spaced apart from each other, and the edge portion of the optical waveguide element is sandwiched between the first clamping portion and the second clamping portion.

8. The optical module according to claim 7, characterized in that: The limiting element further includes a third holding part, which is located on the side of the first holding part away from the second holding part, and the third holding part is spaced apart from the first holding part. The edge of the first lens is sandwiched between the first retaining portion and the third retaining portion, and the first retaining portion is sandwiched between the first lens and the optical waveguide element.

9. The optical module according to claim 7, characterized in that: The limiting element further includes a fourth holding part, which is located on the side of the second holding part away from the first holding part, and the fourth holding part is spaced apart from the first holding part. The edge of the second lens has a slot, which cooperates with the fourth holding part. The fourth holding part extends into the slot, and the second holding part is clamped between the second lens and the optical waveguide element.

10. The optical module according to claim 1, characterized in that: When the optical module includes the locking element; The fixed frame includes a separate first frame portion and a second frame portion, the first frame portion and the second frame portion being located at opposite ends of the optical waveguide element, and the optical waveguide element being sandwiched between the first frame portion and the second frame portion; The locking element includes a first locking element and a second locking element. The first locking element locks the first lens, the first frame portion and the second lens into one unit, and fixes the first frame portion between the first lens and the second lens. The second locking element locks the first lens, the second frame portion and the second lens into one unit, and fixes the second frame portion between the first lens and the second lens.

11. The optical module according to claim 10, characterized in that: The first locking element includes a screw or nut and a nut, the screw or nut passing through the first lens, the first frame portion, and the second lens, and the nut locking the end of the screw or nut, thereby locking the first lens, the first frame portion, and the second lens together; the second locking element includes a screw or nut and a nut, the screw or nut passing through the first lens, the second frame portion, and the second lens, and the nut locking the end of the screw or nut, thereby locking the first lens, the second frame portion, and the second lens together.

12. The optical module according to claim 10, characterized in that: The first frame portion and the second frame portion are respectively provided with retaining grooves, and the two opposite ends of the edge portion of the optical waveguide element are respectively limited in the retaining grooves of the first frame portion and the retaining grooves of the second frame portion.

13. An augmented reality glasses, characterized in that, It includes a projection system and an optical module as described in any one of claims 1 to 12, wherein the projection system is used to generate a light beam that is projected onto the optical module.

Images