Front frame components and smart glasses

Abstract

This invention discloses a front frame assembly and smart glasses. The front frame assembly includes a frame and a waveguide lens. The frame has a first mounting portion and a second mounting portion spaced apart. The waveguide lens includes a substrate, a cover plate, and a grating layer. The grating layer is disposed between the substrate and the cover plate. The substrate has a first surface facing the cover plate, a second surface away from the cover plate, and a side surface extending along the thickness direction of the substrate. The grating layer is connected to the first surface, and the side surface is spaced apart from the inner wall of the frame to allow the substrate to have a certain amount of expansion and contraction. The cover plate is bonded to the first mounting portion, and the grating layer and the substrate are positioned between the cover plate and the second mounting portion. Alternatively, the front frame assembly further includes a limiting portion bonded to the first mounting portion, and the waveguide lens is positioned between the limiting portion and the second mounting portion. In this invention, the substrate of the front frame assembly undergoes free deformation during reliability testing and recovers its initial shape at room temperature. Light can propagate according to a preset optical path, ensuring the display effect of the waveguide lens.

Description

Technical Field

[0001] This invention relates to the field of optical device technology, and more particularly to front frame components and smart glasses. Background Technology

[0002] Smart glasses include head-mounted devices such as AR (Augmented Reality) glasses, VR (Virtual Reality) glasses, and MR (Mixed Reality) glasses. These glasses have been applied in various fields, greatly facilitating people's lives and work, and enhancing their experience of how technology changes the world.

[0003] In related technologies, taking AR glasses as an example, to achieve lightweight AR glasses, the waveguide lenses in AR glasses are usually bonded to the outer frame with adhesive. During the bonding process, the substrate of the waveguide lens and the frame are typically bonded together with adhesive. However, during reliability testing, because the testing environment is usually high temperature and high humidity, the waveguide lens will deform to a certain extent at high temperatures. The substrate bonded to the frame is restricted in its free expansion and contraction during deformation, unable to achieve a free and adaptive thermal deformation process. The substrate also pulls on the adhesive attached to it, weakening the bond between the substrate and the frame and changing their relative position. When the reliability test ends and the glasses return to room temperature, the substrate cannot deform freely and return to its initial shape, resulting in a decrease in the display resolution of the waveguide lens. Summary of the Invention

[0004] In view of this, the present invention proposes a front frame assembly and smart glasses, which aims to enable the substrate of the front frame assembly to freely stretch and deform before and after reliability testing, and to enable the normal display of the optical waveguide lens after the substrate returns to its initial surface shape.

[0005] The first aspect of the present invention provides a front frame assembly, a lens frame, wherein a first mounting portion and a second mounting portion are spaced apart on the lens frame; an optical waveguide lens, the optical waveguide lens comprising a substrate, a cover plate, and a grating layer, the grating layer being disposed between the substrate and the cover plate, the substrate having a first surface facing the cover plate, a second surface away from the cover plate, and a side surface extending along the thickness direction of the substrate, the grating layer being connected to the first surface, and the side surface being spaced apart from the inner wall of the lens frame to allow the substrate to have a certain amount of expansion and contraction; and, the cover plate being bonded to the first mounting portion, the grating layer and the substrate being positioned between the cover plate and the second mounting portion; or, the front frame assembly further includes a limiting portion, the limiting portion being bonded to the first mounting portion, the optical waveguide lens being positioned between the limiting portion and the second mounting portion.

[0006] As can be seen from the above technical solutions, the front frame assembly proposed in the first aspect of the present invention uses a cover plate bonded to a first mounting portion on the lens frame, and uses a cover plate and a second mounting portion to limit the substrate and grating layer; or, it uses a limiting portion bonded to the first mounting portion, and uses a limiting portion and a second mounting portion to limit the entire optical waveguide lens; thereby preventing bonding between the substrate and the lens frame, and ensuring that the substrate, grating layer and cover plate are tightly fitted, while the substrate has a certain amount of free expansion and contraction due to thermal expansion and contraction, allowing the substrate to deform freely in a high temperature and high humidity environment during reliability testing, and to return to its original shape at room temperature after the reliability test is completed, so that the signal light can propagate according to a preset optical path during the propagation between the substrate and the grating layer, ensuring that the display effect of the optical waveguide lens is within a preset range.

[0007] A second aspect of the present invention provides a front frame assembly comprising: a lens frame having a first mounting portion thereon; an optical waveguide lens comprising a substrate, a cover plate, and a grating layer, the grating layer being disposed between the substrate and the cover plate; the substrate having a first surface facing the cover plate, a second surface away from the cover plate, and a side surface extending along the thickness direction of the substrate; the grating layer being connected to the first surface; the side surface and the second surface being spaced apart from the inner wall of the lens frame to allow the substrate to have a certain amount of expansion and contraction; the grating layer being bonded to the cover plate; and the cover plate being bonded to the first mounting portion.

[0008] As can be seen from the above technical solution, the front frame assembly proposed in the second aspect of the present invention uses a cover plate to bond to the first mounting part on the lens frame, and bonds the grating layer connected to the first surface of the substrate to the cover plate, so that the relative positions of the substrate, the grating layer and the cover plate remain unchanged. Since the side and second surfaces of the substrate are separated from the inner wall of the lens frame, the substrate does not need to be bonded to the lens frame. Therefore, during the reliability test, the substrate deforms freely in a high temperature and high humidity environment. After the reliability test is completed and the substrate returns to room temperature, it restores its original shape. Thus, during the propagation of signal light between the substrate and the grating layer, it can propagate according to the preset optical path, ensuring that the display effect of the optical waveguide lens is within the preset range.

[0009] A front frame assembly according to a third aspect of the present invention includes: a lens frame, wherein a first mounting portion and a second mounting portion are spaced apart on the lens frame; an optical waveguide lens, wherein the optical waveguide lens includes a substrate, a cover plate, and a grating layer, the substrate having a first surface facing the cover plate, a second surface away from the cover plate, and a side surface extending along the thickness direction of the substrate, the grating layer being connected to the second surface, and the side surface being spaced apart from the inner wall of the lens frame to allow the substrate to have a certain amount of expansion and contraction; and, the cover plate being bonded to the first mounting portion, and the grating layer and the substrate being positioned between the cover plate and the second mounting portion; or, the front frame assembly further includes a limiting portion, the limiting portion being bonded to the first mounting portion, and the optical waveguide lens being positioned between the limiting portion and the second mounting portion; and a protective sheet, wherein the protective sheet is connected to the lens frame, the protective sheet and the grating layer being spaced apart on the same side of the substrate, and the protective sheet including a photochromic sheet or a protective sheet.

[0010] As can be seen from the above technical solutions, in the front frame assembly proposed in the third aspect of the present invention, the grating layer is disposed on the second side of the substrate facing the protective sheet. The protective sheet can effectively block external forces from acting on the grating layer, allowing the grating layer of this application to have more arrangement forms. The protective sheet can also block some external light from entering the human eye, improving the viewing experience of the human eye when wearing the front frame assembly in strong external ambient light. By using a cover plate to bond to the first mounting part on the lens frame, and using the cover plate and the second mounting part to limit the substrate and the grating layer; or by using a limiting part to bond to the first mounting part, and using the limiting part and the second mounting part to limit the entire optical waveguide lens; thus, the substrate and the lens frame are not bonded together, and the substrate, the grating layer and the cover plate are kept in close contact. Under the premise that the substrate has a certain amount of free expansion and contraction due to thermal expansion and contraction, the substrate can freely deform in a high temperature and high humidity environment during the reliability test, and return to its original shape when it returns to room temperature after the reliability test is completed. Thus, during the propagation of signal light between the substrate and the grating layer, it can propagate according to the preset optical path, ensuring that the display effect of the optical waveguide lens is within the preset range.

[0011] The smart glasses proposed in the fourth aspect of the present invention include temples and a front frame assembly of the foregoing embodiments, wherein the temples are connected to the frame of the front frame assembly.

[0012] As can be seen from the above technical solutions, the smart glasses proposed in the fourth aspect of the present invention have temples connected to the frame, and the entire smart glasses can be conveniently worn on the ear through the temples; since the smart glasses have the front frame component of the aforementioned embodiment, they also have the beneficial effects brought by the aforementioned front frame component, which will not be elaborated here.

[0013] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the disclosure of the embodiments of the present invention. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a front frame assembly proposed in some embodiments of the present invention, wherein a grating layer and a substrate are limited between the cover plate and the second mounting part, and the grating layer and the cover plate are bonded together; Figure 2 This is a schematic diagram of the structure of the front frame assembly proposed in some embodiments of the present invention, wherein a grating layer and a base are limited between the cover plate and the second mounting part, a water-proof and breathable pad is provided between the grating layer and the cover plate, and a buffer pad is provided between the base and the second mounting part. Figure 3 This is a schematic diagram of the front frame assembly proposed in some embodiments of the present invention, wherein an optical waveguide lens is limited between the limiting part and the second mounting part, and the grating layer and the cover plate are bonded together and provided with a water-proof and breathable pad. Figure 4 This is a schematic diagram of the structure of a front frame assembly proposed in some embodiments of the present invention, wherein a portion of an optical waveguide lens is limited between the limiting part and the second mounting part, and another portion of the optical waveguide lens is limited in the slot; Figure 5 This is a schematic diagram of the structure of a front frame assembly proposed in some embodiments of the present invention, wherein the cover plate and the first mounting part are bonded together, the cover plate and the base are centered, and the opening of the mounting groove faces away from the human eye. Figure 6 This is a schematic diagram of the structure of a front frame assembly proposed in some embodiments of the present invention, wherein the cover plate and the first mounting part are bonded together, and the edge of the cover plate extends beyond the base; Figure 7 This is a schematic diagram of the structure of a front frame assembly proposed in some embodiments of the present invention, wherein the cover plate and the first mounting part are bonded together, the cover plate and the base are centered, and the groove of the mounting groove faces the near-eye side; Figure 8 This is a schematic diagram of the structure of a front frame assembly proposed in some embodiments of the present invention, wherein the grating structure is disposed on the second surface of the substrate; Figure 9 This is a three-dimensional structural diagram of the smart glasses proposed in some embodiments of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1000, Smart Glasses; 100. Front frame assembly; 10. Picture frames; 11. First mounting section; 111. Mounting slot; 12. Second mounting section; 121. Support section; 122. Slot; 20. Optical waveguide lens; 21. Base; 211. First surface; 212. Second surface; 213. Side surface; 22. Cover plate; 23. Raster layer; 30. Limiting part; 31. First end; 32. Second end; 41. Waterproof and breathable pad; 42. Cushioning pad; 50. Adhesive part; 60. Protective sheet; 200. Temples of the glasses. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0018] Where there is no conflict, the following embodiments and features can be combined with each other.

[0019] The front frame assembly of smart glasses typically includes lenses and a frame. To secure the frame and lenses, the lenses are usually glued to the frame or clipped together. Taking AR glasses as an example, when the lens base is clipped to the frame, it is prone to wobbling. When the lens base is bonded to the frame, during product reliability testing in high temperature and humidity environments, the lens deforms. The base bonded to the frame is restricted in its free expansion and contraction during deformation, unable to achieve free adaptive thermal deformation or return to its original shape at room temperature. This results in irreversible deformation loss of the lens. Light cannot propagate along the preset path after entering the lens, causing a decrease in the resolution of the displayed image.

[0020] In view of this, the present invention proposes a front frame assembly 100 and smart glasses 1000 to further optimize the connection structure between the optical waveguide lens 20 and the frame 10, so that the structure of the front frame assembly 100 is stable after the components are assembled, and can maintain the preset optical display performance after reliability testing.

[0021] Combination Figures 1 to 4 As shown, an embodiment of the present invention provides a front frame assembly 100, including: a frame 10 and an optical waveguide lens 20.

[0022] The frame 10 is provided with a first mounting part 11 and a second mounting part 12 at intervals. The first mounting part 11 and the second mounting part 12 are located at different positions on the frame 10, forming different mounting parts and / or limiting structures.

[0023] Furthermore, the optical waveguide lens 20 includes a substrate 21, a cover plate 22, and a grating layer 23. The grating layer 23 is disposed between the substrate 21 and the cover plate 22. The substrate 21 has a first surface 211 facing the cover plate 22, a second surface 212 away from the cover plate 22, and a side surface 213 extending along the thickness direction of the substrate 21. The grating layer 23 is connected to the first surface 211, and the side surface 213 is spaced apart from the inner wall of the lens frame 10 so that the substrate 21 can have a certain amount of expansion and contraction. That is, there is no direct adhesive connection between the substrate 21 and the lens frame 10. During the process of thermal expansion and contraction, the substrate 21 is not directly restricted by the external force from the lens frame 10 and can freely expand and contract.

[0024] Furthermore, such as Figure 1 and Figure 2 As shown, to fix the relative position between the optical waveguide lens 20 and the frame 10, the cover plate 22 is bonded to the first mounting part 11, and a grating layer 23 and a substrate 21 are positioned between the cover plate 22 and the second mounting part 12. Alternatively, in other solutions, such as... Figure 3 and Figure 4 As shown, the front frame assembly 100 also includes a limiting part 30, which is bonded to the first mounting part 11, and an optical waveguide lens 20 is limited between the limiting part 30 and the second mounting part 12.

[0025] As can be seen from the above, the front frame assembly 100 proposed in this invention, with the lens frame 10 serving as the frame carrier of the entire front frame assembly 100, can be used to connect with the optical waveguide lens 20 or to the temple 200. The grating layer 23 of the optical waveguide lens 20 has a coupling-in region and a coupling-out region, which can couple the signal light emitted by the optomechanical component from the coupling-in region into the substrate 21 (or a combination of the substrate 21 and other layer structures) and propagate it through total internal reflection, and then couple it out from the coupling-out region to the human eye, enabling the human eye to see the image. The structures on the coupling-in region and the coupling-out region are usually fine micro-nano structures, forming a coupling-in grating or a coupling-out grating. Therefore, the grating layer 23 usually needs to be placed in the inner layer for protection, so that the propagation of light by the entire optical waveguide lens 20 is kept within a preset range. This application effectively protects the grating layer 23 by placing it between the substrate 21 and the cover plate 22, making it less susceptible to damage from external impacts. It also prevents contaminants such as fingerprints or dust from interfering with the coupling of light into and out of the grating layer 23. In some specific embodiments, nanoimprint adhesive can be applied to the substrate 21, and a template can be used to imprint relevant micro / nano structures onto the adhesive. After curing, a composite layer with the grating layer 23 on the first surface 211 of the substrate 21 is created, ensuring a stable connection between the grating layer 23 and the substrate 21.

[0026] In some embodiments of this application, by using a cover plate 22 to bond with the first mounting portion 11 on the frame 10, and using the cover plate 22 and the second mounting portion 12 to limit the substrate 21 and the grating layer 23, the substrate 21 and the frame 10 are not bonded together, and the entire optical waveguide lens 20 does not need to be bonded and fixed by the substrate 21. However, the solution of this application allows the substrate 21, the grating layer 23 and the cover plate 22 to be in close contact, while the substrate 21 has a certain amount of free expansion and contraction due to thermal expansion and contraction. During the reliability test, the substrate 21 can deform freely in a high temperature and high humidity environment, and return to its original shape when it returns to room temperature after the reliability test is completed. This allows the signal light to propagate according to the preset optical path during the propagation between the substrate 21 and the grating layer 23, ensuring that the display effect of the optical waveguide lens 20 is within the preset range.

[0027] In some embodiments of this application, an additional limiting part 30 is added, which can improve the appearance of the entire front frame assembly 100. The limiting part 30 acts as an intermediate connector, and is bonded to the first mounting part 11 by the limiting part 30 and the second mounting part 12, thereby limiting the entire optical waveguide lens 20. Therefore, it is not necessary to bond the substrate 21 to the lens frame 10, but the bonding surface is set between the limiting part 30 and the lens frame 10. In these embodiments, under the premise that the substrate 21, the grating layer 23 and the cover plate 22 are kept in close contact, the substrate 21 has a certain amount of free expansion and contraction due to thermal expansion and contraction. During the reliability test, the substrate 21 can freely deform in a high temperature and high humidity environment, and return to its original shape when it returns to room temperature after the reliability test is completed. This allows the signal light to propagate according to the preset optical path during the total internal reflection propagation between the substrate 21 and the grating layer 23, ensuring that the display effect of the optical waveguide lens 20 is within the preset range.

[0028] It is understood that, since the second mounting part 12 of this application is disposed opposite to the cover plate 22 (or the limiting part 30) and the grating layer 23 and the base 21 are limited, the edge of the base 21 is also located in the internal space enclosed by the entire frame 10, so that the edge of the base 21 is not exposed to the outside of the frame 10, which is beneficial to improving the integrity and aesthetics of the front frame assembly 100.

[0029] In some embodiments of this application, such as Figures 1 to 4 As shown, the grating layer 23 and the cover plate 22 are bonded together. The grating layer 23 and the cover plate 22 can be bonded by applying adhesive to the entire surface, or by applying adhesive to the edge of the grating layer 23 where there are no coupling gratings and coupling out gratings, thus ensuring a stable connection between the grating layer 23 and the cover plate 22 and maintaining their relative positions. This is beneficial for the signal light emitted by the optomechanical component to be accurately directed to the coupling grating.

[0030] In some specific embodiments of this application, the grating layer 23 and the cover plate 22 are bonded together using OCA (Optically Clear Adhesive). This optical adhesive is colorless and transparent with a total light transmittance greater than 99%, minimizing its impact on light propagation and allowing light to propagate stably between the substrate 21 and the grating layer 23. The optical adhesive provides good bonding strength, ensuring a stable connection between the grating layer 23 and the cover plate 22. This optical adhesive cures at room temperature, facilitating the bonding process. It is also resistant to yellowing over extended use, ensuring that the light-transmitting portion of the waveguide lens 20 remains transparent and that light propagates effectively even after prolonged use. Furthermore, the optical adhesive exhibits minimal curing shrinkage, preventing the cover plate 22 and grating layer 23 from peeling off after bonding.

[0031] In some embodiments, the grating layer 23 and the cover plate 22 are bonded together with a full-surface adhesive, thereby improving the bonding effect between the grating layer 23 and the cover plate 22 and sealing the coupling-in grating and coupling-out grating on the grating layer 23; in other embodiments, the edge regions of the centered portion between the grating layer 23 and the cover plate 22 are bonded with adhesive, and the coupling-in grating and coupling-out grating on the grating layer 23 are both located between the cured adhesive, the cover plate 22 and the substrate 21, thereby sealing the coupling-in grating and coupling-out grating.

[0032] In some embodiments of this application, the limiting portion 30 is a metal limiting member or a plastic limiting member, or it may be a limiting member made of other materials. This improves the aesthetic appearance of the front frame assembly 100.

[0033] In some embodiments, the limiting part 30 is shaped to fit the frame 10 and has a curved arc segment, thereby enabling the limiting part 30 to be connected to the first mounting part 11 of the frame 10 and to fit in appearance.

[0034] In other embodiments, part of the limiting portion 30 may be replaced with the outer shell of the frame 10, and the cover plate 22 of the optical waveguide lens 20 may be fixed inside the frame 10 by a snap or fastener (such as a screw).

[0035] In some embodiments of this application, such as Figure 2 , Figure 3 and Figure 4 As shown, the front frame assembly 100 also includes a water-proof and breathable pad 41, which is provided between the grating layer 23 and the cover plate 22. By providing the water-proof and breathable pad 41, not only can water vapor be isolated, preventing it from entering the coupling area and coupling area of ​​the grating layer 23 from the outside and affecting light propagation; it can also maintain the pressure between the grating layer 23 and the cover plate 22 in balance with the external pressure, preventing bulging. The water-proof and breathable pad 41 also provides some support between the grating layer 23 and the cover plate 22, preventing the cover plate 22 from being dented by external force and hitting the micro / nano structure of the grating layer 23, effectively protecting the grating layer 23. The water-proof and breathable pad 41 also acts as a buffer when the front frame assembly 100 is subjected to external force, thereby reducing the impact of external force on the cover plate 22. The waterproof and breathable pad 41 can also provide a certain buffer margin during the thermal expansion and deformation of the substrate 21 and the recovery of its shape at room temperature, helping the substrate 21 to return to its original position and making the cover plate 22, the substrate 21 and the grating layer 23 fit together more tightly.

[0036] In some embodiments of this application, such as Figure 3 and Figure 4As shown, the front frame assembly 100 also includes a water-proof and breathable pad 41. The water-proof and breathable pad 41 is provided between the grating layer 23 and the cover plate 22, and the grating layer 23 and the cover plate 22 are bonded together. In these embodiments, by bonding the grating layer 23 to the cover plate 22 while simultaneously providing the breathable pad 41 between them, the aforementioned advantages of bonding and the water-proof and breathable pad 41 are achieved, which will not be elaborated upon here. In some illustrative embodiments, the water-proof and breathable pad 41 can be a polypropylene pad or a polyethylene pad, etc., without limitation, as long as it can achieve the aforementioned water-proof and breathable functions. In these embodiments, the grating layer 23 and the cover plate 22 are not bonded together; the relative position between the substrate 21 with the grating layer 23 and the cover plate 22 is stabilized entirely through a limiting effect. This completely eliminates the pulling of adhesive during the deformation of the substrate 21, maintaining the display effect of the waveguide lens 20, and exhibiting excellent environmental performance.

[0037] In some specific embodiments of this application, in order to enable the light emitted by the optomechanical component to smoothly enter the coupling region in the optical waveguide lens 20, the water-proof and breathable pad 41 is set away from the coupling region; at the same time, in order to enable the light transmitted by total internal reflection in the optical waveguide lens 20 to smoothly enter the human eye from the coupling region, the water-proof and breathable pad 41 also needs to be set away from the coupling region. Therefore, in these embodiments, the setting of the water-proof and breathable pad 41 does not affect the propagation of light.

[0038] In some embodiments of this application, such as Figure 2 As shown, the front frame assembly 100 also includes a buffer pad 42, which is disposed between the base 21 and the second mounting portion 12. By providing the buffer pad 42, the base 21 can be effectively supported. In other words, the buffer pad 42 can effectively lift the base 21, which does not need to be connected to the lens frame 10. This allows the base 21 to have sufficient expansion and contraction margin during expansion and contraction, while maintaining a tight fit between the grating layer 23 and the cover plate 22. Furthermore, the base 21's position relative to the lens frame 10 remains unchanged after it shrinks back to its original state, which is beneficial for the waveguide lens 20 to maintain its preset light display performance. In some illustrative embodiments, the buffer pad 42 can be a rubber pad, silicone pad, thermoplastic elastomer pad, sponge pad, plastic pad, etc., as long as it can achieve the aforementioned buffering and support effects; no limitation is made here.

[0039] In some embodiments of this application, such as Figures 1 to 4 , Figures 6 to 8As shown, the front frame assembly 100 has a near-eye side facing the human eye. The first mounting part 11 includes a mounting groove 111, the opening of which faces the near-eye side. An adhesive part 50 is provided in the mounting groove 111. By opening the mounting groove 111 and providing the adhesive part 50 in the groove, not only can a certain amount of adhesive be accommodated, but the height of the frame 10 and the cover plate 22 or the limiting part 30 after connection can also be controlled within a suitable range. This effectively prevents the cover plate 22 or the limiting part 30 from protruding too much from the frame 10, thereby facilitating the thinning of the front frame assembly 100 and improving the aesthetics and integration of the front frame assembly 100's appearance design.

[0040] In some specific embodiments, the mounting groove 111 has a first groove wall near the center of the optical waveguide lens 20 and a second groove wall away from the center of the optical waveguide lens 20. The height of the first groove wall is less than the height of the second groove wall. The end edge of the cover plate 22 (or the limiting part 30) is spaced apart from or in contact with the inner side of the second groove wall for limiting, so that the second groove wall can circumferentially limit the cover plate 22 (or the limiting part 30), effectively preventing the cover plate 22 (or the limiting part 30) from coming outward from the periphery of the lens frame 10. The surface of the cover plate 22 (or the limiting part 30) is in contact with the top surface of the first groove wall, so that the first groove wall can support the cover plate 22 (or the limiting part 30), effectively improving the stability of the cover plate 22 (or the limiting part 30) relative to the lens frame 10. In these embodiments, when the cover plate 22 (or limiting part 30) and the frame 10 are relatively stable, the cover plate 22 (or limiting part 30) is bonded to the adhesive part 50 in the mounting groove 111, thereby realizing the support and connection of the frame 10 to the cover plate 22 (or limiting part 30).

[0041] In some other embodiments of this application, the front frame assembly 100 has a near-eye side facing the human eye, and the first mounting part 11 includes a mounting groove 111. The groove opening of the mounting groove 111 is opened facing away from the near-eye side. An adhesive part 50 is provided in the mounting groove 111. The adhesive part 50 is bonded to the surface of the cover plate 22. In these embodiments, the optical waveguide lens 20 is completely retracted within the space enclosed by the frame 10. The surface of the cover plate 22 and the surface of the frame 10 have a certain distance difference, which can reduce the probability of human hands touching the cover plate 22 and keep the surface of the cover plate 22 clean.

[0042] In some embodiments of this application, the side of the cover plate 22 away from the grating layer 23 is bonded to the adhesive portion 50. The cover plate 22, grating layer 23, and substrate 21 are sequentially arranged in a direction perpendicular to the opening of the mounting groove 111. The second surface 212 of the substrate 21 does not protrude from the outer surface of the frame 10. In these embodiments, the grating layer 23 is located between the cover plate 22 and the substrate 21, protecting it from damage by external force. The fact that the second surface 212 of the substrate 21 does not protrude from the outer surface of the frame 10 ensures that the surface of the waveguide lens 20 does not protrude relative to the surface of the frame 10, resulting in a smoother and more aesthetically pleasing surface for the front frame assembly 100. In these embodiments, the second mounting portion 12 is positioned near the eye relative to the first mounting portion 11, in which case the second surface of the substrate 21 faces towards the near eye; or, the first mounting portion 11 is positioned near the eye relative to the second mounting portion 12, in which case the second surface of the substrate 21 faces away from the near eye. No limitation is imposed here.

[0043] In some embodiments of this application, such as Figure 1 , Figure 2 , Figure 6 and Figure 8 As shown, along the extension direction parallel to the cover plate 22, the cross-sectional area of ​​the cover plate 22 is larger than the cross-sectional area of ​​the base 21. The projected outline of the base 21 on the surface facing the cover plate 22 does not exceed the surface outline of the cover plate 22. The edge of the cover plate 22 is bonded to the adhesive portion 50. In these embodiments, by extending the edge of the cover plate 22, not only can a larger adhesive surface be formed between the cover plate 22 and the adhesive portion 50, allowing the cover plate 22 to be stably connected to the frame 10 through the adhesive portion 50, but also, after the cover plate 22 is connected to the frame 10, it can cover one side of the entire outer surface of the frame 10, improving the aesthetics of the appearance. It can also effectively prevent dust, sweat, and other contaminants from entering the grating layer 23 inside the waveguide lens 20 from one side of the cover plate 22, thereby providing further protection and contamination isolation for the grating layer 23.

[0044] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the front frame assembly 100 includes a limiting part 30, and the second mounting part 12 includes a support part 121. The first end 31 of the limiting part 30 is bonded to the adhesive part 50, and the second end 32 of the limiting part 30 extends away from the first end 31. The second end 32 is spaced apart from the support part 121. The optical waveguide lens 20 is limited between the second end 32 and the support part 121. In these embodiments, by additionally providing the limiting part 30, the optical waveguide lens 20 can be limited to a specific position between the lens frame 10 and the limiting part 30, which facilitates installation and also prevents the substrate 21 from bonding with the lens frame 10, allowing the substrate 21 to maintain a certain deformation allowance.

[0045] In some further embodiments, such as Figure 4 As shown, the second mounting part 12 includes a slot 122, a portion of the optical waveguide lens 20 is connected in the slot 122, and the other portion of the optical waveguide lens 20 is limited between the second end 32 of the limiting part 30 and the support part 121. In these embodiments, by snapping one end of the optical waveguide lens 20 into the slot 122, supporting the other end of the optical waveguide lens 20 on the support part 121, and providing an adhesive part 50 in the mounting groove 111, the limiting part 30 presses the optical waveguide lens 20 and bonds it to the adhesive part 50, thus effectively limiting the optical waveguide lens 20 by the limiting part 30 and the support part 121.

[0046] The front frame assembly 100 of some other embodiments of this application is described below, in which the second mounting part 12 is not provided.

[0047] Combination Figures 5 to 7 As shown, an embodiment of the present invention provides a front frame assembly 100, including: a frame 10 and an optical waveguide lens 20.

[0048] The frame 10 is provided with a first mounting part 11. Without contradiction, the structure of the first mounting part 11 can be referred to the above description, and will not be repeated here.

[0049] Furthermore, the optical waveguide lens 20 includes a substrate 21, a cover plate 22, and a grating layer 23. The grating layer 23 is disposed between the substrate 21 and the cover plate 22. The substrate 21 has a first surface 211 facing the cover plate 22, a second surface 212 away from the cover plate 22, and a side surface 213 extending along the thickness direction of the substrate 21. The grating layer 23 is connected to the first surface 211. The side surface 213 and the second surface 212 are both spaced apart from the inner wall of the lens frame 10 so that the substrate 21 can have a certain amount of expansion and contraction. The grating layer 23 is bonded to the cover plate 22. The cover plate 22 is bonded to the first mounting portion 11. In these embodiments of this application, the side of the substrate 21 away from the cover plate 22 is suspended, which is beneficial for the substrate 21 to deform after being heated and to recover its original shape at room temperature.

[0050] As can be seen from the above, the front frame assembly 100 proposed in this invention, with the lens frame 10 serving as the frame carrier of the entire front frame assembly 100, can be used to connect with the optical waveguide lens 20 or to the temple 200. The grating layer 23 of the optical waveguide lens 20 has a coupling-in region and a coupling-out region, which can couple the signal light emitted by the optomechanical component from the coupling-in region into the substrate 21 (or a combination of the substrate 21 and other layer structures) and propagate it through total internal reflection, and then couple it out from the coupling-out region to the human eye, enabling the human eye to see the image. The structures on the coupling-in region and the coupling-out region are usually fine micro-nano structures, forming a coupling-in grating or a coupling-out grating. Therefore, the grating layer 23 usually needs to be placed in the inner layer for protection, so that the propagation of light by the entire optical waveguide lens 20 is kept within a preset range. This application effectively protects the grating layer 23 by placing it between the substrate 21 and the cover plate 22, making it less susceptible to damage from external impacts. It also prevents contaminants such as fingerprints or dust from interfering with the coupling of light into and out of the grating layer 23. In some specific embodiments, nanoimprint adhesive can be applied to the substrate 21, and a template can be used to imprint relevant micro / nano structures onto the adhesive. After curing, a composite layer with the grating layer 23 on the first surface 211 of the substrate 21 is created, ensuring a stable connection between the grating layer 23 and the substrate 21.

[0051] By bonding the cover plate 22 to the first mounting part 11 on the frame 10, and bonding the grating layer 23 connected to the first surface 211 of the substrate 21 to the cover plate 22, the relative positions of the substrate 21, the grating layer 23 and the cover plate 22 remain unchanged. Since the side surface 213 and the second surface 212 of the substrate 21 are spaced from the inner wall of the frame 10, the substrate 21 does not need to be bonded to the frame 10. Therefore, during the reliability test, the substrate 21 deforms freely in a high temperature and high humidity environment. After the reliability test is completed and the substrate returns to room temperature, the substrate 21 returns to its original shape. This allows the signal light to propagate according to the preset optical path during the total internal reflection propagation between the substrate 21 and the grating layer 23, ensuring that the display effect of the optical waveguide lens 20 is within the preset range.

[0052] In some embodiments of this application, the grating layer 23 and the cover plate 22 can be bonded by applying adhesive to the entire surface, or by applying adhesive to the edge of the grating layer 23 where there are no coupling gratings and coupling out gratings, thus ensuring a stable connection between the grating layer 23 and the cover plate 22 and maintaining their relative positions. This facilitates the accurate targeting of the signal light emitted by the optomechanical components to the coupling grating. In a specific embodiment, the adhesive applied between the grating layer 23 and the cover plate 22 is OCA adhesive. The function of OCA adhesive is as described above and will not be repeated here.

[0053] In some embodiments of this application, such as Figure 6As shown, along the extension direction parallel to the cover plate 22, the cross-sectional area of ​​the cover plate 22 is larger than the cross-sectional area of ​​the base 21. The projection of the second surface 212 of the base 21 onto the surface of the cover plate 22 does not overlap with the projection of the mirror frame 10 onto the surface of the cover plate 22. In other words, the end of the base 21 closest to the second surface 212 is entirely separated from the mirror frame 10. The base 21 can freely expand and contract without being affected by the mirror frame 10.

[0054] In other embodiments of this application, such as Figure 5 and Figure 7 As shown, the cross-sectional area of ​​the cover plate 22 is the same as that of the base 21, and they have the same cross-sectional shape. The cover plate 22 and the base 21 are centered. In these embodiments, it is beneficial to align the edges of the entire optical waveguide lens 20, making it easy to place the optical waveguide lens 20 into the space enclosed by the lens frame 10, and to bond the cover plate 22 to the first mounting part 11 through the adhesive part 50.

[0055] Without contradiction, the specific structural form of the first mounting part 11 and the connection form between the first mounting part 11 and the cover plate 22 in this application can be referred to the above description, and will not be repeated here.

[0056] In some embodiments of this application, such as Figures 1 to 8 As shown, the front frame assembly 100 also includes a protective sheet 60. The front frame assembly 100 has a near-eye side facing the human eye. The protective sheet 60 is connected to the frame 10 and is spaced apart from the waveguide lens 20, with the waveguide lens 20 positioned near the eye relative to the protective sheet 60. The protective sheet 60 may be a photochromic sheet or a protective film. The protective sheet 60 can shield the side of the entire front frame assembly 100 away from the human eye and effectively prevent damage to the waveguide lens 20 if the front frame assembly 100 is dropped and subjected to external force. The protective sheet 60 can also be a protective film with a certain color, thereby filtering out some background light, which is beneficial for the use of the front frame assembly 100 in strong light. The protective sheet 60 can also be a photochromic sheet, which can be photochromic, for example, changing color under certain lighting conditions, such as changing color when exposed to ultraviolet light within a specific wavelength range. For example, the protective sheet 60 can also be an electrochromic sheet. When a certain electrical signal is input, the protective sheet 60 changes to different colors, thereby achieving different appearances.

[0057] In some embodiments of this application, the protective sheet 60 and the frame 10 are connected by at least one of the following methods: adhesive bonding, snap-fit ​​bonding, and plug-in bonding. In a specific embodiment, the frame 10 is provided with a groove. After applying adhesive to the groove, the edge of the protective sheet 60 is placed into the groove and bonded to the groove with adhesive.

[0058] The following describes a front frame assembly 100 according to some embodiments of the present invention, in which a grating layer 23 is disposed on a second surface 212 of a substrate 21 away from a cover plate 22.

[0059] like Figure 8 As shown, an embodiment of the present invention provides a front frame assembly 100, including: a lens frame 10, an optical waveguide lens 20, and a protective sheet 60.

[0060] The frame 10 is provided with a first mounting part 11 and a second mounting part 12 at intervals. The first mounting part 11 and the second mounting part 12 are located at different positions on the frame 10, forming different mounting parts and / or limiting structures.

[0061] Furthermore, the optical waveguide lens 20 includes a substrate 21, a cover plate 22, and a grating layer 23. The substrate 21 has a first surface 211 facing the cover plate 22, a second surface 212 away from the cover plate 22, and a side surface 213 extending along the thickness direction of the substrate 21. The grating layer 23 is connected to the second surface 212. The side surface 213 is spaced apart from the inner wall of the lens frame 10 so that the substrate 21 can have a certain amount of expansion and contraction. That is, there is no direct adhesive connection between the substrate 21 and the lens frame 10. During the process of thermal expansion and contraction, the substrate 21 is not directly restricted by the external force from the lens frame 10 and can freely expand and contract.

[0062] Furthermore, to fix the relative position between the optical waveguide lens 20 and the frame 10, the cover plate 22 is bonded to the first mounting portion 11, and a grating layer 23 and a substrate 21 are positioned between the cover plate 22 and the second mounting portion 12. Alternatively, in other embodiments, the front frame assembly 100 may also include a limiting portion 30, which is bonded to the first mounting portion 11, and the optical waveguide lens 20 is positioned between the limiting portion 30 and the second mounting portion 12.

[0063] Furthermore, the protective sheet 60 is attached to the frame 10, and the protective sheet 60 and the grating layer 23 are disposed on the same side of the substrate 21 at a distance. The protective sheet 60 includes a photochromic sheet or a protective sheet.

[0064] As can be seen from the above, in the front frame assembly 100 proposed in this invention, the grating layer 23 is disposed on the side of the second surface 212 of the substrate 21 facing the protective sheet 60. The protective sheet 60 can effectively block external forces from acting on the grating layer 23, so that the grating layer 23 of this application can have more arrangement forms. The protective sheet 60 can also block some external light from entering the human eye, improving the viewing experience of the human eye after wearing the front frame assembly 100 when the external ambient light is strong.

[0065] The solution of this application ensures that, while maintaining a tight fit between the substrate 21, the grating layer 23, and the cover plate 22, the substrate 21 has a certain amount of free expansion and contraction due to thermal expansion and contraction. During reliability testing, the substrate 21 can freely deform in a high-temperature and high-humidity environment, and return to its original shape upon returning to room temperature after the reliability test. This allows the signal light to propagate along a preset optical path between the substrate 21 and the grating layer 23, ensuring that the display effect of the waveguide lens 20 remains within a preset range. Without contradiction, the structural features, connection relationships, and resulting beneficial effects of the components in these embodiments can be referred to the foregoing description, and will not be repeated here.

[0066] In some embodiments of the present invention, the substrate 21 can be made of materials such as glass, sapphire, polycarbonate, and acrylic; the cover plate 22 can be made of one or more of glass, polycarbonate, and acrylic. The substrate 21 and cover plate 22 made of the above-mentioned materials have good transparency, are lightweight, possess certain mechanical strength and toughness, and are not easily broken by external forces, which is beneficial for supporting and protecting the grating layer 23. For example, when glass is used, it is easy to process, colorless and transparent, and has good support. When polycarbonate (PC) is used, it is colorless and transparent, heat-resistant, impact-resistant, inexpensive, and readily available. When acrylic (PMMA, polymethyl methacrylate) is used, it has high transmittance, good toughness, high hardness, is not easily broken, and is easy to bond. Of course, the choice of materials for the substrate 21 and cover plate 22 of the present invention is not limited to the above-mentioned material types; other polymeric materials with similar properties can also be used, such as cyclic olefin copolymer plastics (COC plastics), which have high transparency, excellent low-temperature impact resistance, and elasticity. For example, cyclic olefin polymers (COPs) have characteristics such as high transparency, high gloss, high water vapor barrier properties, high rigidity and strength, and excellent chemical resistance.

[0067] In some embodiments of the present invention, to improve the anti-fouling performance of the cover plate 22, an anti-fouling film can be provided on the surface of the cover plate 22 away from the substrate 21. The anti-fouling film can provide a certain degree of protection for the cover plate 22, effectively preventing dust, fingerprints, and other contaminants from sticking to the surface of the cover plate, and maintaining the cleanliness and aesthetic appearance of the surface of the optical waveguide lens 20. In some specific embodiments, the anti-fouling film is an AF film (Anti-Fingerprint film) layer, which can effectively resist the adhesion of fingerprints and stains. It has advantages such as high transparency, high hardness, scratch resistance, and chemical corrosion resistance, thereby effectively protecting the exposed surface of the cover plate 22.

[0068] Similarly, such as Figure 7As shown, when the substrate 21 is exposed to the outside, an anti-fingerprint film can also be provided on the surface of the substrate 21, which will not be elaborated here.

[0069] The smart glasses 1000 of this application will now be described. It should be noted that the smart glasses 1000 of this application can be a head-mounted device such as AR (Augmented Reality) glasses, VR (Virtual Reality) glasses, or MR (Mixed Reality) glasses.

[0070] like Figure 9 As shown, a smart glasses 1000 includes temples 200 and a front frame assembly 100 of the aforementioned embodiments, with the temples 200 connected to the front frame assembly 100.

[0071] As can be seen from the above, the smart glasses 1000 proposed in this invention can be conveniently worn on the ear via the temples 200. Since the smart glasses 1000 has the front frame component 100 of the aforementioned embodiment, it also has the beneficial effects brought by the aforementioned front frame component 100, which will not be elaborated here.

[0072] In other embodiments, the smart glasses 1000 of this application may also include components such as optical engine components and control circuits, which are existing technologies well known to those skilled in the art and will not be described in detail here.

[0073] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A front frame assembly, characterized in that, include: A mirror frame, wherein a first mounting portion and a second mounting portion are provided at intervals on the mirror frame; An optical waveguide lens includes a substrate, a cover plate, and a grating layer. The grating layer is disposed between the substrate and the cover plate. The substrate has a first surface facing the cover plate, a second surface away from the cover plate, and a side surface extending along the thickness direction of the substrate. The grating layer is connected to the first surface. The side surface is spaced apart from the inner wall of the lens frame to allow the substrate to have a certain amount of expansion and contraction. The cover plate is bonded to the first mounting portion, and the grating layer and the substrate are positioned between the cover plate and the second mounting portion; or, the front frame assembly further includes a limiting portion, which is bonded to the first mounting portion, and the waveguide lens is positioned between the limiting portion and the second mounting portion.

2. The front frame assembly as claimed in claim 1, characterized in that, The grating layer is bonded to the cover plate; and / or... It also includes a water-proof and breathable pad, which is provided between the grating layer and the cover plate.

3. The front frame assembly as claimed in claim 2, characterized in that, It also includes a cushioning pad disposed between the base and the second mounting portion.

4. The front frame assembly as described in any one of claims 1 to 3, characterized in that, The front frame assembly has a proximal side facing the human eye, and the first mounting portion includes a mounting groove with its opening facing the proximal side, and an adhesive portion is provided in the mounting groove.

5. The front frame assembly as claimed in claim 4, characterized in that, The cover plate is bonded to the adhesive part on the side away from the grating layer. The cover plate, the grating layer and the substrate are arranged in sequence in the direction perpendicular to the groove of the mounting groove. The second surface of the substrate does not protrude from the outer surface of the frame.

6. The front frame assembly as claimed in claim 4, characterized in that, Along the extension direction parallel to the cover plate, the cross-sectional area of ​​the cover plate is greater than the cross-sectional area of ​​the substrate, the projected profile of the substrate on the surface facing the cover plate does not exceed the surface profile of the cover plate, and the edge of the cover plate is bonded to the adhesive portion.

7. The front frame assembly as claimed in claim 4, characterized in that, The front frame assembly includes a limiting portion, the second mounting portion includes a supporting portion, the first end of the limiting portion is bonded to the adhesive portion, the second end of the limiting portion extends away from the first end, and the second end is spaced apart from the supporting portion, and the optical waveguide lens is limited between the second end and the supporting portion.

8. The front frame assembly as claimed in claim 7, characterized in that, The second mounting portion includes a slot, in which a portion of the optical waveguide lens is connected, and another portion of the optical waveguide lens is positioned between the second end of the positioning portion and the support portion.

9. A front frame assembly, characterized in that, include: A mirror frame, wherein a first mounting portion is provided on the mirror frame; An optical waveguide lens includes a substrate, a cover plate, and a grating layer. The grating layer is disposed between the substrate and the cover plate. The substrate has a first surface facing the cover plate, a second surface away from the cover plate, and a side surface extending along the thickness direction of the substrate. The grating layer is connected to the first surface. The side surface and the second surface are spaced apart from the inner wall of the lens frame to allow the substrate to have a certain amount of expansion and contraction. The grating layer is bonded to the cover plate. as well as, The cover plate is bonded to the first mounting part.

10. The front frame assembly as claimed in claim 9, characterized in that, Along a direction parallel to the extension of the cover plate, the cross-sectional area of ​​the cover plate is larger than the cross-sectional area of ​​the base, and the projection of the second surface of the base onto the surface of the cover plate does not overlap with the projection of the mirror frame onto the surface of the cover plate; or, The cross-sectional area of ​​the cover plate is the same as that of the cross-sectional area of ​​the base, and the cover plate and the base are centered.

11. The front frame assembly as described in any one of claims 1-3 and 9-10, characterized in that, It also includes a protective film, the front frame assembly having a near-eye side facing the human eye, the protective film being attached to the frame and spaced apart from the waveguide lens, the waveguide lens being positioned near the eye relative to the protective film; the protective film includes a photochromic film or a protective film.

12. A front frame assembly, characterized in that, include: A mirror frame, wherein a first mounting portion and a second mounting portion are provided at intervals on the mirror frame; An optical waveguide lens includes a substrate, a cover plate, and a grating layer. The substrate has a first surface facing the cover plate, a second surface away from the cover plate, and a side surface extending along the thickness direction of the substrate. The grating layer is connected to the second surface. The side surface is spaced apart from the inner wall of the lens frame so that the substrate can have a certain amount of expansion and contraction. as well as, The cover plate is bonded to the first mounting portion, and the grating layer and the substrate are limited between the cover plate and the second mounting portion; or, the front frame assembly further includes a limiting portion, the limiting portion is bonded to the first mounting portion, and the waveguide lens is limited between the limiting portion and the second mounting portion. A protective sheet is attached to the lens frame and is disposed on the same side of the substrate at a distance from the grating layer. The protective sheet may include a photochromic sheet or a protective sheet.

13. A type of smart glasses, characterized in that, It includes temples and a front frame assembly as described in any one of claims 1 to 12, wherein the temples are connected to the frame of the front frame assembly.

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