Lens module, eyeglasses and wearable device

Abstract

The present application relates to lens module, glasses and wearable device. The lens module comprises a frame, a first corrective lens, a second corrective lens and an adjusting device. The frame defines a receiving cavity, the first corrective lens and the second corrective lens are located in the receiving cavity, and the second corrective lens is arranged opposite to the first corrective lens. The adjusting device comprises a driving mechanism and an elastic member provided with a cavity. The elastic member is arranged on the frame and connected to at least one of the first corrective lens and the second corrective lens. The driving mechanism is used to drive the medium to flow into or out of the cavity to deform the elastic member, so as to change the distance between the first corrective lens and the second corrective lens. The lens module can be adjusted adaptively for users with different vision degrees, meeting the use requirements of different users or different scenes. The elastic member can also play a buffering role to prevent the lens module from being damaged when falling or hitting.

Description

Technical Field

[0001] This application relates to the field of optical equipment technology, specifically to a lens module, eyeglasses equipped with the lens module, and a wearable device. Background Technology

[0002] As the global proportion of people with refractive errors gradually increases, the demand for vision correction is rising significantly. Currently, the lens power of vision correction devices such as myopia glasses or hyperopia glasses is usually fixed, while a user's eye prescription changes over time, requiring them to replace their lenses periodically. Furthermore, users' needs for lens power vary depending on their usage environment; for example, a clearer view is required while driving compared to watching television, often necessitating the preparation of multiple pairs of glasses with different prescriptions. Moreover, since different users have different eye prescriptions, the same pair of glasses cannot be shared by multiple users. All of these factors cause significant inconvenience and financial burden for users.

[0003] Furthermore, with the rapid development of virtual reality and augmented display technologies, wearable augmented reality (AR) devices are receiving increasing attention. For users with myopia or hyperopia, using AR devices often requires the use of prescription glasses. For example, myopic individuals typically attach or detachably attach their lenses to AR glasses to combine AR functionality with vision correction features. However, such a combined device is generally bulky and heavy, impacting the user experience and comfort. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a lens module, glasses equipped with the lens module, and a wearable device.

[0005] According to one aspect, this application provides a lens module including a frame, a first corrective lens, a second corrective lens, and an adjustment device. The frame defines a receiving cavity, within which the first and second corrective lenses are located, with the second corrective lens disposed opposite to the first corrective lens. The adjustment device includes a drive mechanism and an elastic member having a cavity. The elastic member is disposed in the frame and connected to at least one of the first and second corrective lenses. The drive mechanism is used to drive a medium to flow into or out of the cavity to deform the elastic member, thereby changing the distance between the first and second corrective lenses.

[0006] The lens module of this application uses a driving mechanism to drive a medium to flow into or out of the cavity of an elastic member, causing the elastic member to deform. This allows adjustment of the distance between the first and second corrective lenses, thereby continuously changing the overall corrective power of the lens module. This lens module is suitable for users with myopia or hyperopia and can adaptively adjust to users with different visual acuity, meeting the needs of different users or the needs of the same user in different scenarios. Since the adjustment device is integrated into the lens module, continuous focal length adjustment is achieved directly at the module level, eliminating the need for additional accessories and reducing costs. Furthermore, focal length adjustment is achieved by driving the medium to flow into or out of the elastic member, resulting in high reliability, rapid response, and a relatively simple structure. In addition, the elastic member also acts as a buffer, preventing damage to the lens module upon drops or impacts.

[0007] According to another aspect, this application provides eyeglasses including the lens module described above and temples. One end of the temple is connected to the frame of the lens module, and the drive mechanism of the lens module is mounted on the temple. Therefore, the eyeglasses also possess all the advantages and technical effects of the aforementioned lens module.

[0008] According to another aspect, this application provides a wearable device including a frame, a first corrective lens, a second corrective lens, an optical waveguide sheet, and an adjustment device. The frame defines a receiving cavity, within which the first and second corrective lenses are located, with the second corrective lens spaced apart from the first corrective lens. The optical waveguide sheet is located between the first and second corrective lenses, and includes a light guide portion, a coupling grating, and an output grating, the coupling grating and the output grating being spaced apart on the surface of the light guide portion facing the first corrective lens. The adjustment device is connected to at least one of the first and second corrective lenses for adjusting the distance between the first and second corrective lenses.

[0009] The wearable device of this application not only integrates the AR function provided by the optical waveguide sheet with the vision correction function provided by the corrective lens, but also uses the corrective lens as a protective component for the optical waveguide sheet. This improves the wearable device's impact and drop resistance, effectively reducing its size and weight and enhancing the user experience. Furthermore, the wearable device can adaptively adjust to users with different vision prescriptions, meeting the needs of diverse users or the same user in different scenarios. Because the adjustment device is integrated into the wearable device, continuous focus adjustment is achieved directly at the product level, eliminating the need to purchase additional accessories and reducing user costs. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below only illustrate some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the front view structure of a lens module according to an embodiment of this application;

[0012] Figure 2 This is a lens module according to an embodiment of the present application. Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0013] Figure 3 Another embodiment of the lens module of this application is along Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0014] Figure 4 This is another embodiment of the lens module of this application. Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0015] Figure 5 This is a schematic diagram of the focusing principle of a lens module according to an embodiment of this application;

[0016] Figure 6 This is a lens module according to an embodiment of the present application. Figure 4 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0017] Figure 7 Another embodiment of the lens module of this application is along Figure 4 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0018] Figure 8 yes Figure 7 A schematic cross-sectional view of the frame in the lens module along the COC direction;

[0019] Figure 9 This is a lens module according to an embodiment of the present application. Figure 7 Schematic diagram of cross-sectional structure along the COC direction;

[0020] Figure 10 The elastic member of the lens module in one embodiment of this application is along Figure 7 Schematic diagram of cross-sectional structure along the COC direction;

[0021] Figure 11 This is a schematic diagram of the drive mechanism of a lens module according to an embodiment of this application;

[0022] Figure 12This is a schematic diagram of the drive mechanism of a lens module according to another embodiment of this application;

[0023] Figure 13 This is another embodiment of the lens module of this application. Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0024] Figure 14 Another embodiment of this application is a lens module along Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0025] Figure 15 This is a three-dimensional structural diagram of eyeglasses according to an embodiment of this application;

[0026] Figure 16 This is a circuit block diagram of glasses according to an embodiment of this application;

[0027] Figure 17 This is a three-dimensional structural diagram of a wearable device according to an embodiment of this application;

[0028] Figure 18 This is a wearable device according to an embodiment of the present application. Figure 17 Schematic diagram of the cross-sectional structure along the AA direction;

[0029] Figure 19 This is a circuit block diagram of a wearable device according to an embodiment of this application.

[0030] Figure label:

[0031] 10-Lens module; 110-Frame; 112-Receiving cavity; 114-Groove; 116-Receiving hole; 117-First frame portion; 118-Second frame portion; 119-Fastener; 120-First corrective lens; 122-First surface; 124-Second surface; 126-Protrusion; 130-Second corrective lens; 132-Third surface; 134-Fourth surface; 140-Adjustment device; 142-Elastic member; 1422-Cavity Body; 1424-First diaphragm; 1426-Second diaphragm; 1428-Elastic cylinder; 144-Drive mechanism; 1442-Pump; 1442a-Pump outlet; 1442b-Pump inlet; 1444-Valve; 146-Medium; 147-First channel; 1448-Reservoir; 149-Second channel; 150-Optical waveguide; 152-Light guide; 154-Coupled grating; 156-Coupled grating; 160-Adhesive;

[0032] 20 - Eyeglasses; 210 - Temples; 220 - Controller;

[0033] 30 - Wearable device; 310 - Wearable component; 320 - Projection engine; 322 - Display; 324 - Lens; 330 - Processor; 340 - Memory;

[0034] D1 - First direction; D2 - Second direction; d - Spacing; R - Radius of curvature. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are merely some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] The terms "first," "second," etc., in the specification, claims, and drawings of this application are used only to distinguish different objects and not to describe a specific order or importance. Features defined by "first," "second," etc., may explicitly or implicitly include one or more of those features. The terms "connected" and "linked" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; a direct connection or an indirect connection; a connection within two elements or an interaction between two elements, etc. Directional indications such as up, down, left, right, front, and back are used only to indicate the relative positional relationship between components in a specific orientation. If the specific orientation changes, the directional indication changes accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0037] The technical solutions in the embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be noted that, for ease of explanation, the same reference numerals denote the same components in the embodiments of this application, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0038] Vision correction devices are used to correct human vision, including glasses for nearsightedness and farsightedness. The prescription of the lenses in vision correction devices is usually fixed, while a user's eye prescription changes over time, requiring the user to replace lenses periodically. Furthermore, users' needs for different prescriptions vary depending on their usage environment, often necessitating the preparation of multiple pairs of glasses with different prescriptions. Moreover, different users have different eye prescriptions, meaning the same pair of glasses cannot be used by multiple users. These situations cause significant inconvenience and financial burden for users. With continuous technological advancements, corrective lenses capable of continuous prescription adjustment have emerged. Three main technologies for achieving continuous prescription adjustment are electrowetting liquid lenses, elastic film liquid lenses, and liquid crystal lenses.

[0039] Electrowetting liquid lenses, based on the principle of electrowetting, adjust the radius of curvature of the high-refractive-index liquid by changing the wettability between the liquid and the lens wall through voltage, thereby changing the lens power. Applying continuously different voltages results in continuous changes in the radius of curvature of the liquid lens, achieving continuous adjustment of the lens power. However, this method requires a high driving voltage, posing a risk of liquid electrolysis; furthermore, the lens has a small aperture, complex mechanical structure, large module size, and high cost. Elastic film liquid lenses encapsulate a high-refractive-index liquid in an elastic film. Controlling the mechanical structure to generate external force to compress the film's periphery changes the curvature at the film's center, thus altering the lens power. Continuously changing the applied external force also results in continuous changes in the radius of curvature at the film's center, achieving continuous adjustment of the lens power. However, in larger devices, the elastic film is susceptible to collapse due to gravity, leading to optical path distortion; moreover, the lens has a small aperture, complex mechanical structure, large module size, and high cost. Liquid crystal lenses simulate a lens effect by applying voltage to control the arrangement of liquid crystal molecules in different regions, thereby changing the refractive index of the liquid crystal material and achieving a gradient distribution of the refractive index. By reasonably changing the magnitude and distribution of the applied voltage, the lens power can be continuously adjusted. However, this method has low light transmittance, a small zoom range, and a slow response time.

[0040] Wearable augmented reality devices (such as AR glasses), as an emerging near-eye-friendly device, combine virtual images with the real environment and are widely popular. However, users with myopia or hyperopia often need to use their own glasses when using AR devices. For example, nearsighted users can magnetically attach AR glasses with waveguides to the temples of their glasses for convenience; however, this separate structure results in bulky AR glasses, affecting aesthetics, and the protective layer of the waveguide is not connected to the nearsighted lenses, wasting the protective capabilities of the lenses and contributing to overall weight. Furthermore, for AR devices with integrated vision correction functions, the lens prescription is usually fixed, requiring users to order a custom-made AR device with a specific prescription lens. This makes the device unsuitable for different users, affecting its applicability and widespread adoption.

[0041] In view of the above, this application provides a lens module with a novel structure. This lens module achieves continuous dynamic adjustment of the focal length by changing the distance between two corrective lenses through an adjustment device. This application also provides eyeglasses equipped with this lens module and a wearable device that integrates AR and vision correction functions and is capable of continuous dynamic adjustment of the corrective lens power.

[0042] In one aspect, embodiments of this application provide a lens module, such as Figures 1 to 14 As shown. See also Figures 1 to 4 The lens module 10 includes a frame 110, a first corrective lens 120, a second corrective lens 130, and an adjustment device 140. The frame 110 defines a receiving cavity 112, within which both the first corrective lens 120 and the second corrective lens 130 are located, with the second corrective lens 130 positioned opposite to the first corrective lens 120. The adjustment device 140 includes an elastic member 142 and a driving mechanism 144. The elastic member 142 is disposed in the frame 110 and connected to at least one of the first corrective lens 120 and the second corrective lens 130. The elastic member 142 has an internal cavity for receiving a medium 146, and the driving mechanism 144 drives the medium to flow into or out of the cavity to deform the elastic member 142, thereby adjusting the distance d between the first corrective lens 120 and the second corrective lens 130.

[0043] The frame 110 and the first corrective lens 120 are in Figure 1The first corrective lens 120 and the second corrective lens 130 (not shown) are both circular in shape, and the frame 110 surrounds the entire outer periphery of both the first corrective lens 120 and the second corrective lens 130. It is easy to understand that the frame 110 can also have other outline shapes, such as elliptical, rectangular, or rounded rectangles; correspondingly, the first corrective lens 120 and the second corrective lens 130 can also have elliptical, rectangular, or rounded rectangle outlines. The frame 110 can also have a non-closed outline, such as a semi-frame shape, so that the frame 110 only surrounds a portion of the outer periphery of the first corrective lens 120 and the second corrective lens 130, and supports the lenses. Both the first corrective lens 120 and the second corrective lens 130 are lenses used to correct vision; specifically, they can be selected as myopia lenses or hyperopia lenses according to the user's needs.

[0044] like Figures 2 to 4 As shown, the second corrective lens 130 and the first corrective lens 120 are disposed opposite each other along the first direction D1. The distance d between the first corrective lens 120 and the second corrective lens 130 is the distance between them along the first direction D1, where the first direction D1 is the direction in which the second corrective lens 130 moves relative to the first corrective lens 120, and is also the direction in which they are stacked. The first corrective lens 120 has a first surface 122 facing away from the second corrective lens 130 and a second surface 124 facing the second corrective lens 130. The radius of curvature R1 of the first surface 122 is different from the radius of curvature R2 of the second surface 124, so that the propagation direction of light changes after passing through the first corrective lens 120. Since the first surface faces the outside of the lens module and the second surface faces the inside, the first surface 122 can be a convex surface, and the second surface 124 can be a concave surface or a plane, so as to facilitate the bonding of the second surface to the second corrective lens 130, or to create a receiving space between the first corrective lens 120 and the second corrective lens 130. In one embodiment, the first corrective lens 120 is a hyperboloid concave lens, that is, the first surface 122 is a convex surface protruding outwards, and the second surface 124 is a concave surface recessed inwards, such as... Figure 2 and Figure 3 As shown. Compared to a single-curved concave lens with the same power, a hyperboloid concave lens has a smaller thickness and weight, which helps to reduce the size and weight of the lens module 10.

[0045] In one embodiment, the first surface 122 and the second surface 124 of the first corrective lens 120 are both spherical, and the radius of curvature R1 of the first surface 122 is greater than the radius of curvature R2 of the second surface 124, thereby better forming a hyperboloid concave lens with negative optical power. For example, the radius of curvature R1 can be from 0.35m to infinity; further, the range of the radius of curvature R1 satisfies the condition 0.35m≤R1≤2.8m; even further, the radius of curvature R1 can be, but is not limited to, 0.35m, 0.5m, 0.7m, 1.0m, 1.4m, 1.8m, 2.0m, 2.5m, 2.8m, etc. The radius of curvature R2 can range from 0.233m to infinity; further, the range of the radius of curvature R2 satisfies the condition 0.233m ≤ R1 ≤ 2.8m; even further, the radius of curvature R2 can be, but is not limited to, 0.233m, 0.3m, 0.5m, 0.7m, 1.0m, 1.4m, 1.8m, 2.0m, 2.5m, 2.8m, etc. The correction power De1 of the first corrective lens 120 can satisfy 25° ≤ De1 ≤ 500°; for example, De1 can be, but is not limited to, 25°, 50°, 75°, 100°, 150°, 200°, 250°, 300°, 350°, 400°, 450°, 500°, etc. The correction power De1 of the first corrective lens 120, as well as the numerical ranges of the radii of curvature R1 and R2, can be designed according to user requirements, and this application does not impose specific limitations.

[0046] The second corrective lens 130 has a third surface 132 facing the first corrective lens 120 and a fourth surface 134 facing away from the first corrective lens 120. The radius of curvature R3 of the third surface 132 is different from the radius of curvature R4 of the fourth surface 134, causing the propagation direction of light to change after passing through the second corrective lens 130. Since the fourth surface faces the outside of the lens module and the third surface faces the inside, the fourth surface 134 can be convex, and the third surface 132 can be concave or flat, so as to facilitate bonding the third surface to the first corrective lens 120, or to create a receiving space between the first corrective lens 120 and the second corrective lens 130. In one embodiment, the second corrective lens 130 is a single-curved concave lens, that is, the third surface 132 is flat and the fourth surface 134 is concave, such as... Figure 2 and Figure 3 As shown. When the third surface 132 is planar, it facilitates bonding the third surface 132 of the second corrective lens 130 to the first corrective lens 120. If the second corrective lens 130 faces the user's eye and the fourth surface 134 is concave, the distance between the second corrective lens 130 and the user's eye can be increased, improving the user's wearing comfort and safety.

[0047] In one embodiment, the third surface 132 of the second corrective lens 130 is a plane, and the fourth surface 134 is a sphere. The radius of curvature R4 of the fourth surface 134 can range from 0.078m to infinity; further, the range of the radius of curvature R4 satisfies the condition 0.078m≤R4≤2.8m; even further, the radius of curvature R4 can be, but is not limited to, 0.078m, 0.14m, 0.3m, 0.5m, 0.7m, 1.0m, 1.4m, 1.8m, 2.0m, 2.5m, 2.8m, etc. The correction power De2 of the second corrective lens 130 can range from 25° to 900°; for example, De2 can be, but is not limited to, 25°, 50°, 75°, 100°, 150°, 200°, 250°, 300°, 350°, 400°, 450°, 500°, 550°, 600°, 700°, 800°, 900°, etc. The numerical range of the correction power De2 and the radius of curvature R4 of the second corrective lens 130 can be designed according to user requirements, and this application does not impose specific limitations.

[0048] The materials constituting the first corrective lens 120 and the second corrective lens 130 may be the same or different from each other. For example, each lens may be made of glass or resin. The resin lens may be made of at least one of the following: polymethyl methacrylate, polyurethane, polycarbonate, polyethylene terephthalate, polydiallyl glycol carbonate, polyallyl diethylene glycol carbonate, polypropylene glycol, and poly1,3-butanediol methacrylate.

[0049] The transmittance of the first corrective lens 120 and the second corrective lens 130 can be the same or different from each other. For example, the transmittance T of the first corrective lens 120 can satisfy the condition T≥90%; further, the transmittance T of the first corrective lens 130 can satisfy the condition T≥95%; even further, the transmittance T can be, but is not limited to, 90%, 92%, 94%, 96%, 98%, 99%, etc. The higher the transmittance of the corrective lenses 120 and 130, the better the light transmission effect of the lens module 10. In one embodiment, at least one of the first surface 122 and the second surface 124 of the first corrective lens 120, and the third surface 132 and the fourth surface 134 of the second corrective lens 130 can be coated with an anti-reflection film (i.e., an anti-reflection film) to reduce the reflection of light from each surface, thereby increasing the overall transmittance of the lens module 10. The anti-reflection film can include one or more of titanium dioxide, silicon dioxide, zirconium dioxide, silicon nitride, etc. The antireflective coating can be a single layer or multiple layers stacked together. It can be formed using one or more techniques, such as non-conductive electroplating (NCVM), evaporation coating, sputtering coating, and atomic layer deposition (ALD).

[0050] exist Figure 2 and Figure 3 In the illustrated embodiment, both the first corrective lens 120 and the second corrective lens 130 are concave lenses, enabling the lens module 10 as a whole to be used as a myopia lens. Figure 4 In the illustrated embodiment, both the first corrective lens 120 and the second corrective lens 130 are convex lenses, enabling the lens module 10 as a whole to be used as a farsighted lens. If the second surface 124 of the first corrective lens 120 and the third surface 132 of the second corrective lens 130 are both planar, then the first corrective lens 120 can closely abut against the second corrective lens 130, thereby reducing the minimum distance d between the two lenses to 0; or a flat plate component, such as..., can be placed between the two lenses. Figure 13 , Figure 14 and Figure 18 The optical waveguide 150 shown in the figure.

[0051] In use, the first corrective lens 120 is positioned closer to the observed object than the second corrective lens 130, while the second corrective lens 130 is positioned closer to the user's eye than the first corrective lens 120. Ambient light enters the first corrective lens 120 through its first surface 122, changes its propagation direction, exits through its second surface 124, and then enters the second corrective lens 130 through its third surface 132, changing its propagation direction again before exiting through its fourth surface 134. Since both the first and second corrective lenses 120 and 130 have vision correction functions and can change the propagation direction of light passing through them, the overall correction power of the lens module 10 differs from that of any single lens; it is influenced by both lenses. For example, if the user is nearsighted, both the first corrective lens 120 and the second corrective lens 130 can be nearsighted lenses, and external light is diverged through the two nearsighted lenses. If the user is farsighted, both the first corrective lens 120 and the second corrective lens 130 can be farsighted lenses, and external light is diverged through the two nearsighted lenses. In this case, the overall corrective power of the lens module 10 is greater than the corrective power of either lens. Optionally, one of the first corrective lens 120 and the second corrective lens 130 can be selected as a nearsighted lens, and the other can be selected as a farsighted lens. External light is diverged or diffused through one lens and then diffused or diffused through the other lens. In this case, the overall corrective power of the lens module 10 is between the corrective powers of the two lenses.

[0052] See Figure 5 , Figure 5The focusing principle is illustrated using lens module 10, which is suitable for farsighted users (i.e., both the first corrective lens 120 and the second corrective lens 130 are convex lenses). However, this principle also applies to nearsighted users. Figure 2 and Figure 5 As shown, the object, the first corrective lens 120, and the second corrective lens 130 are along the same optical axis (i.e., Figure 2 The first direction D1 shown is arranged sequentially, and the user's eye views the object from the side of the second corrective lens 130 away from the first corrective lens 120; the distance between the user's eye and the second corrective lens 130 remains constant, while the first corrective lens 120 can move along the optical axis. Specifically, the user can operate the drive mechanism 144 to drive the medium to flow into or out of the cavity 1422 of the elastic member to change the volume of the elastic member 142, thereby changing the distance d between the first corrective lens 120 and the second corrective lens 130 along the first direction D1, so that the first corrective lens 120 moves toward or away from the user's eye. Figure 5 In the diagram, L1 represents the position of the first corrective lens 120, L2 and L2” represent the positions of the second corrective lens 130 before and after its movement, and U2 and U2” represent the positions of the image observed by the user before and after the movement of the second corrective lens 130.

[0053] The formula for calculating the combined focal length f of the first corrective lens 120 and the second corrective lens 130 is f = (f1 × f2) / (f1 + f2 d). Where f1 is the focal length of the first corrective lens 120, f2 is the focal length of the second corrective lens 130, and d is the distance between the two corrective lenses along the optical axis (i.e., the first direction D1), in meters.

[0054] Given that the relationship between refractive power D and focal length f is D = 1 / f, the relationship between refractive power D and distance d can be obtained as follows:

[0055]

[0056] Given that the relationship between the lens power N and the refractive power D is N = 100D, the relationship between the lens power N and the power of each corrective lens and the inter-lens distance d can also be obtained as follows:

[0057] N=100D=100×(D1+D2-d×D1×D2),

[0058] Where N represents the overall correction power of the lens module 10, D1 represents the diopter of the first corrective lens 120, D2 represents the diopter of the second corrective lens 130, and d represents the distance between the two lenses along the first direction D1.

[0059] As shown in the above formula, when the refractive power D1 (or focal length f1) of the first corrective lens 120 and the refractive power D2 (or focal length f2) of the second corrective lens 130 are predetermined, when the distance between the two corrective lenses is d1, the overall power of the lens module 10 is N1 = 100 × (D1 + D2 - d1 × D1 × D2); when the distance between the two corrective lenses is d2, the overall power of the lens module 10 is N2 = 100 × (D1 + D2 - d2 × D1 × D2). Therefore, by adjusting the distance between the corrective lenses 120 and 130, the overall power of the lens module 10 can be arbitrarily adjusted between N1 and N2.

[0060] In one embodiment, f1 = 80.39, f2 = 39.76, the adjustable axial distance ranges from 0 to 4.96 mm, and the adaptable hyperopic refractive power D ranges from 0.5 to 7, thus meeting the needs of users with different degrees of hyperopia (50-700 degrees). When the first corrective lens 120 is moved along the first direction D1 toward the second corrective lens 130, the distance between the two corrective lenses decreases from d1 to d2. Correspondingly, the combined focal length of the first corrective lens 120 and the second corrective lens 130 decreases (combined focal length ranges from 28.34 to 27.07), the combined magnification increases (combined magnification ranges from 8.82 to 9.24), and the overall field of view of the lens module 10 (i.e., the angle between the lines connecting the upper and lower edges of the object and the eye) also increases (field of view ranges from 80° to 90°). According to the imaging principle of the magnification system, as the object distance increases, the virtual image distance is adjusted to a position closer to the human eye (i.e., changing from U2 to U2", ranging from 2m to 0.14m), thereby achieving the purpose of visual accommodation.

[0061] According to the lens module provided in this application, when the driving medium flows into or out of the cavity of the elastic member through the driving mechanism, the volume of the cavity changes, and the elastic member deforms, causing its volume to change. This allows for continuous adjustment of the distance between the first and second corrective lenses along the first direction, thereby changing the combined focal length of the first and second corrective lenses, and thus continuously changing the overall corrective power of the lens module. This lens module is suitable for users with myopia or hyperopia and can be adaptively adjusted for users with different visual acuity, meeting the needs of different users and allowing the product to be shared among different users. Furthermore, the same user can continuously adjust the lens module's power in different usage scenarios to better adapt to the needs of different situations. In addition, since the adjustment device is integrated into the lens module, continuous focal length adjustment is achieved directly at the module level, eliminating the need to purchase additional accessories and saving costs. Moreover, the focal length adjustment is achieved by driving the medium into or out of the elastic member, resulting in high reliability and rapid response, and the adjustment device is relatively simple.

[0062] In embodiments of this application, the elastic member 142 is disposed on the frame 110 and connected to at least one of the first corrective lens 120 and the second corrective lens 130. Specifically, in Figure 2 In the illustrated embodiment, the elastic member 142 is disposed against the inner wall of the frame 110 and within the receiving cavity 112 of the frame 110. The first corrective lens 120 and the second corrective lens 130 are respectively connected to the upper and lower ends of the elastic member 142. When the driving mechanism 144 operates, the driving medium flows into or out of the cavity 1422 of the elastic member, the height of the elastic member 142 in the first direction D1 changes, thereby adjusting the distance d between the first corrective lens 120 and the second corrective lens 130, thus changing the overall correction power of the lens module 10. Figure 3 In the illustrated embodiment, the second corrective lens 130 is fixed to the frame 110, for example, it can be bonded to an inwardly protruding flange at the lower part of the frame 110; the first corrective lens 120 is connected to the upper end of the elastic member 142, that is, the end of the elastic member 142 away from the second corrective lens 130, and can move relative to the frame 110 along the first direction D1; the other end of the elastic member 142 is disposed against the third surface 132 of the second corrective lens. When the driving mechanism 144 drives the medium to flow into or out of the cavity 1422 of the elastic member, the height of the elastic member 142 in the first direction D1 changes, causing the height of the first corrective lens 120 in the first direction D1 to change, thereby adjusting the distance d between the first corrective lens 120 and the second corrective lens 130, thereby changing the overall correction power of the lens module 10. It is easy to understand that the connection methods between the first corrective lens 120 and the second corrective lens 130 and the elastic member 142 can be interchanged, as long as the distance between the two lenses can be adjusted. For example, the first corrective lens 120 can be fixed to the frame 110, and the second corrective lens 130 can be connected to one end of the elastic member 142, allowing the second corrective lens 130 to move relative to the frame 110 along the first direction D1. Alternatively, fixing methods other than adhesive can be used; for example, the first corrective lens 120 and the second corrective lens 130 can be fixedly connected to the elastic member 142 by welding. For ease of explanation, the following description uses the example of the second corrective lens 130 being fixed to the frame 110.

[0063] exist Figure 6In the illustrated embodiment, the elastic member 142 is annular and surrounds the outer periphery of the first corrective lens 120; the outer periphery of the first corrective lens 120 is fixed to the inner wall surface of the upper end of the elastic member 142. In this embodiment, a single driving mechanism 144 can be used to drive the medium into or out of the cavity of the elastic member 142; alternatively, multiple driving mechanisms 144 can be arranged along the periphery of the elastic member 142 to drive the medium into or out of the cavity of the elastic member 142. In this case, the multiple driving mechanisms 144 can be spaced apart along the periphery of the elastic member 142, allowing multiple portions of the annular elastic member 142 to rapidly change height in response to the inflow or outflow of the medium, thereby improving the response speed and shortening the focus adjustment time. Furthermore, multiple drive mechanisms 144 can be evenly spaced along the periphery of the elastic member 142, that is, the distance between any two adjacent drive mechanisms is the same, so that multiple parts of the annular elastic member 142 can change height synchronously and evenly, thereby ensuring that the first corrective lens 120 will not be deflected during the focal length adjustment process, and the position of the optical center of the lens (the direction of light propagation does not change when light passes through the optical center in any direction, that is, the outgoing direction and the incoming direction are parallel to each other) will not change.

[0064] exist Figure 7 and Figure 8 In the illustrated embodiment, multiple elastic members 142 are provided, and the multiple elastic members 142 are spaced apart along the circumferential direction of the frame 110. In this case, a driving mechanism 144 can be used to drive the medium into or out of the cavity of at least one elastic member 142. For example, a separate driving mechanism 144 can be provided for each elastic member 142, that is, different driving mechanisms can be used to drive the medium into or out of the cavities of different elastic members, so that the volume of each elastic member 142 can be adjusted individually to avoid light misalignment caused by the first corrective lens 120 being skewed. Alternatively, only one driving mechanism 144 can be provided for multiple elastic members 142, that is, the same driving mechanism can be used to drive the medium into or out of the cavities of multiple elastic members, thereby reducing the number of driving mechanisms and saving manufacturing costs. Furthermore, the multiple elastic members 142 can be evenly spaced apart along the circumferential direction of the frame 110. At this time, the same driving mechanism can be used to drive the two centrally symmetrical elastic members (that is, the line connecting the two elastic members 142 passes through the central axis O of the first corrective lens 120), so that the two elastic members 142 can change height synchronously and evenly, thereby ensuring that the first corrective lens 120 will not be deflected during the focal length adjustment process and the position of the optical center of the lens will not change.

[0065] The frame 110 is also provided with a receiving hole 116 extending along the first direction D1, and the elastic member 142 is embedded in the receiving hole 116. Thus, the receiving hole 116 can restrict the deformation direction of the elastic member 142, so that the elastic member 142 can only change in height along the first direction D1, and will not change in width or thickness in the same direction along the second direction D2 perpendicular to the first direction D1 (i.e., when the height of the elastic member 142 increases along the first direction D1, the amplitude of the elastic member 142 along the second direction D2 will not increase). This efficiently converts the volume change of the elastic member 142 into a positional change of the first corrective lens 120 along the first direction D1, and further into a change in the focal length of the entire lens module 10. The receiving hole 116 in… Figure 7 The image shows the receiving cavity 112 of the frame 110 communicating with each other, i.e., the receiving hole 116 passes through the inner wall of the frame 110. However, it is easy to understand that the receiving hole 116 can also be closedly disposed inside the frame 110, i.e., the receiving hole 116 does not pass through the inner wall of the frame 110 but communicates with the receiving cavity 112. In this case, the volume change of the elastic member 142 embedded in the receiving hole 116 will not affect the volume of the receiving cavity 112, nor will it affect the fixing method of the second corrective lens 130 relative to the frame 110, so that the second corrective lens 130 will not loosen or even fall off the frame 110 due to the volume change of the elastic member 142. It is easy to understand that it is also possible to... Figure 6 In the illustrated embodiment, a receiving hole 116 is provided. For example, an annular receiving hole 116 is provided in the frame 110, and an annular elastic member 142 is embedded in the receiving hole 116, so that the elastic member 142 can only change height along the first direction D1.

[0066] See also Figure 7 and Figure 8 The second corrective lens 130 is fixed to the frame 110; the first corrective lens 120 is fixed to one end of the elastic member 142 and is slidably connected to the frame 110 through the cooperation of the protrusion 126 and the groove 114. The protrusion 126 protrudes along the second direction D2 on the outer periphery of the first corrective lens 120, and the groove 114 is recessed along the second direction on the inner periphery of the frame 110. The second direction D2 intersects the first direction D1. Through the cooperation of the protrusion 126 and the groove 114, the first corrective lens 120 can be slidably connected to the frame 110, thereby ensuring that the movement direction of the first corrective lens 120 relative to the frame 110 follows the first direction D1 without deviation, thus ensuring the accuracy of focus adjustment. Simultaneously, it ensures that the position of the lens optical center does not change during focus adjustment, reducing discomfort to the user's eyes caused by focus adjustment. The protrusion 126 and the groove 114... Figure 7is shown as having a trapezoidal cross-section, and the groove 114 has a larger size at one end adjacent to the receiving cavity 112 than at the other end. However, it is easily understood that the protrusion 126 and the groove 114 can also adopt other cross-sectional shapes, as long as the protrusion 126 can slide along the groove 114 in the first direction D1. For example, the cross-sectional shapes of the protrusion 126 and the groove 114 can be rectangular; or they can be "convex" shaped, such that the side with a smaller width is adjacent to the receiving cavity 112, and the side with a larger width is away from the receiving cavity 112, so that the first correction lens 120 is not easily detached from the housing 110. The second direction D2 is Figure 7 shown as perpendicular to the first direction D1, that is, the second direction D2 lies in a plane perpendicular to the first direction D1. However, it is easily understood that the angle between the second direction D2 and the first direction D1 can also not be a right angle. For example, when the first direction D1 is taken as the vertical direction, the protrusion 126 may not extend along the horizontal direction, but may extend obliquely downward or obliquely upward.

[0067] It is easily understood that the protrusion 126 and the groove 114 can also be provided on Figure 6 In the illustrated embodiment, for example, a protrusion 126 protruding in the radial direction (the second direction D2) is provided on the outer periphery of the first correction lens 120, and a corresponding groove 114 is provided on the inner periphery of the housing 110, and the protrusion 126 is embedded in the groove 114. In this case, referring to Figure 9 , the first correction lens 120 is fixed to the upper end face of the elastic member 142, that is, the end face of the elastic member 142 facing away from the second correction lens 130, and the protrusion 126 provided on the outer periphery of the first correction lens 120 protrudes in the second direction D2 from the outer periphery of the elastic member 142. Correspondingly, a receiving hole 116 extending in the first direction D1 is provided in the housing 110 for receiving the elastic member 142, and a groove 114 is provided on the upper side of the receiving hole 116 for receiving the protrusion 126 of the first correction lens 120. The groove 114 and the receiving hole 116 communicate with each other, and a step portion is formed between the bottom surface of the groove 114 and the receiving hole 116. When the elastic member 142 is in a natural state (that is, when the elastic member 142 does not undergo elastic deformation), the volume of the cavity 1422 is the smallest. At this time, the protrusion 126 of the first correction lens 120 abuts against the bottom surface of the groove 114, thereby restricting the downward movement of the first correction lens 120; the elastic member 142 does not provide a supporting force for supporting the first correction lens 120, thereby preventing the elastic member 142 from failing prematurely and extending the service life of the elastic member 142. When the fluid is driven into the cavity of the elastic member by the driving mechanism 144, the volume of the cavity 1422 becomes larger, and the restriction of the receiving hole 116 causes the height of the elastic member 142 in the first direction D1 to increase. At the same time, the protrusion 126 of the first correction lens 120 slides upward along the groove 114 in the first direction D1.

[0068] In one embodiment, the elastic member 142 is a capsule-shaped component integrally formed of an elastomeric material, defining a closed cavity 1422 within it for containing a medium. The elastomeric material can be at least one of silicone, rubber, thermoplastic polyurethane (TPU), polydimethylsiloxane (PDMS), polyethylene terephthalate (PET, commonly known as polyester resin), polycarbonate (PC), polymethyl methacrylate (PMMA, also known as acrylic or plexiglass), etc. Elastic members made of these materials have excellent elastic deformation properties, so that when a medium is injected into the cavity of the elastic member via the drive mechanism 144, the volume of the elastic member 142 can rapidly increase, resulting in an increase in the distance d between the two lenses; when the drive mechanism is deactivated, the elastic restoring force forces the medium to flow out of the cavity of the elastic member, and the volume of the elastic member 142 can rapidly decrease, resulting in a decrease in the distance d between the two lenses. Thus, rapid adjustment of the overall corrective power of the lens module 10 can be achieved. Furthermore, the elastic member 142, formed of an elastomer material, can also act as a buffer to prevent damage to the first corrective lens 120 and the second corrective lens 130 when the lens module 10 is dropped or impacted. As for the shape of the cavity, it can be square, circular, annular, or any other arbitrary shape, and this application does not impose any specific limitations.

[0069] exist Figure 10 In the illustrated embodiment, the elastic member 142 includes a first diaphragm 1424, a second diaphragm 1426, and an elastic cylinder 1428 connected between the first diaphragm 1424 and the second diaphragm 1426; the first diaphragm 1424, the second diaphragm 1426, and the elastic cylinder 142 surround a cavity 1422 forming the elastic member 142. The first diaphragm 1424 is connected to a first corrective lens 120, the second diaphragm 1426 is connected to a second corrective lens 130, and the elastic cylinder 1428 is capable of extending and retracting along a first direction D1 to change the distance d between the first corrective lens 120 and the second corrective lens 130. The first diaphragm 1424 and the second diaphragm 1426 may be made of a rigid material, and the elastic cylinder 1428 may be formed of an elastomeric material. As mentioned above, the elastomer material can be selected from at least one of the following: silicone, rubber, thermoplastic polyurethane (TPU), polydimethylsiloxane (PDMS), polyethylene terephthalate (PET, commonly known as polyester resin), polycarbonate (PC), and polymethyl methacrylate (PMMA, also known as acrylic or plexiglass). The elastic cylinder 1428 can be fixedly connected to the first diaphragm 1424 and the second diaphragm 1426 using welding, adhesive bonding, or other methods. In one embodiment, a spring can be embedded inside the elastic cylinder 1428, using the spring's elastic restoring force to replace or supplement the elastic restoring force of the elastomer material, thereby adjusting the distance d between the first corrective lens 120 and the second corrective lens 130.

[0070] In another embodiment, the elastic member 142 may further include only an elastic cylinder 1428 connected between the first corrective lens 120 and the second corrective lens 130, with the cavity 1422 of the elastic member 142 surrounded by the first corrective lens 120, the second corrective lens 130, and the elastic cylinder 1428. Figure 10 Compared to the previous embodiment, this embodiment omits the first diaphragm 1424 and the second diaphragm 1426 on both sides of the elastic cylinder 1428, allowing the upper and lower sides of the elastic cylinder 1428 to be respectively attached to the first corrective lens 120 and the second corrective lens 130, thereby reducing the overall thickness and weight of the lens module 10. It is easily understood that the first diaphragm 1424 or the second diaphragm 1426 can also be connected to one side of the elastic cylinder 1428 and connected to the first corrective lens 120 or the second corrective lens 130, while the other side of the elastic cylinder 1428 is directly connected to the second corrective lens 130 or the first corrective lens 120. As mentioned above, the elastic cylinder 1428 of this embodiment can be formed of an elastomeric material, or a spring can be embedded inside the cylinder wall to provide an elastic restoring force that can change the volume of the elastic member 142.

[0071] See Figure 11 and Figure 12The drive mechanism 114 in the lens module 10 includes a pump 1442 and a valve 1444. The pump outlet 1442a of the pump 1442 is connected to the cavity 1422 of the elastic member 142 via a first channel 147. The valve 1444 is used to regulate the flow rate of the medium 146 into or out of the cavity 1422. Although the pump 1442 and the valve 1444 are shown as two separate components in the figure, it is easy to understand that the two components can also be integrated, for example, the valve 1444 can be a component of the pump 1442. The first channel 147 can be a flexible hose that passes through a through hole provided on the side wall of the frame 110 and a through hole provided on the wall of the elastic member 142, and thus communicates with the cavity 1422 of the elastic member. When the drive mechanism 114 is working, the pump 1442 pumps the medium from the pump inlet 1422b to the pump outlet 1422a, and simultaneously opens the valve 1444, allowing the medium 146 to enter the cavity 1422 of the elastic member through the first channel 147. This changes the volume of the cavity, causing the elastic member to deform and change its volume, thereby adjusting the overall corrective power of the lens module 10. Once the overall corrective power of the lens module 10 is adjusted to meet the user's actual needs, the pump 1442 and valve 1444 are closed, keeping the volume of the elastic member constant, thus maintaining the required overall corrective power of the lens module 10. It is easy to understand that the terms "pump inlet" and "pump outlet" here refer only to the medium flowing into the cavity 1422 of the elastic member, meaning the medium flows from an external medium source into the interior of the elastic member 142. If it is necessary to release the medium inside the elastic member 142 to reverse the overall correction power of the lens module 10, the valve 1444 can be opened while keeping the pump 1442 closed. At this time, under the action of the elastic restoring force, the volume of the elastic member 142 and the volume of its cavity 1422 decrease, forcing the medium to flow out from inside the cavity 1422 through the first channel 147 to the pump inlet 1422b of the pump 1442. Of course, the pump 1442 can also be started and reversed while the valve 1444 is opened. Under the driving action of the pump, the medium is pumped from inside the elastic member 142 to the outside. At this time, the end of the pump 1442 closer to the elastic member can be called the pump inlet, and the end farther away from the elastic member can be called the pump outlet.

[0072] Pump 1442 can be a piezoelectric ceramic pump. A piezoelectric ceramic pump consists of a piezoelectric ceramic disc that deforms under an applied voltage, thereby driving fluid movement. Ceramic pumps are much smaller than traditional mechanical pumps. Due to the extremely poor conductivity of piezoelectric ceramic materials, the operating current is extremely low, resulting in very low driving power, typically in the tens of milliwatts range, making them easy to integrate into electronic devices. Piezoelectric ceramic pumps also eliminate the electromagnetic coils found in traditional mechanical pumps, thus avoiding any electromagnetic interference to electronic devices and improving their operational stability. Valve 1444 can be a solenoid valve, capable of changing the flow rate of the medium passing through it via an applied current. It offers advantages such as small size, low power consumption, ease of control, and rapid response. Each pump 1442 can correspond to one or more valves 1444. When each pump 1442 corresponds to multiple valves 1444, the pump 1442 is connected to the multiple valves 1444 respectively, and each valve 1444 is connected to a cavity 1422 of an elastic member via a first channel 147. Different valves 1444 are connected to different cavities 1422. At this time, the medium content inside multiple cavities 1422 can be adjusted synchronously by one pump 1442, thereby adjusting the overall correction power of the lens module 10.

[0073] exist Figure 11 In the illustrated embodiment, the medium 146 can be gas, and the pump inlet 1442b of the pump 1442 is connected to the external space. Specifically, the medium can be air, and the pump inlet 1442b of the pump 1442 is directly connected to the air environment. In this case, the pump 1442 can also be called an air pump, used to pump gas or air from the pump inlet 1422b to the pump outlet 1422a, and then deliver it to the cavity of the elastic member via the first channel 147. Specifically, a hole can be opened at the adjacent interface between the frame 110 and the elastic member 142, and an air tube can be inserted into the cavity 1422 of the elastic member and sealed with glue; a miniature solenoid valve and a miniature air pump are connected in sequence on the other side of the air tube, so that gas can be pumped into the elastic member through the miniature air pump, or gas can be discharged from the elastic member through the miniature solenoid valve. Valve 1444 is located in... Figure 11 The valve 1444 is shown positioned between the elastic member 142 and the pump 1442. However, it is easy to understand that the valve 1444 can also be positioned on the side of the pump 1442 away from the elastic member 142, so that the pump 1442 is not always in communication with the external space, thereby preventing foreign objects from entering the pump 1442 and affecting its normal operation.

[0074] exist Figure 12In the illustrated embodiment, the medium 146 can be a liquid; the drive mechanism 144 further includes a reservoir 1448, the pump inlet of the pump 1442 is connected to the reservoir 1448 via a second channel 149, and the valve 1444 is used to regulate the flow rate of the medium 146 when it flows between the cavity 1422 of the elastic member and the reservoir 1448. Specifically, the liquid medium can be water or an organic solution, as long as it does not react with the elastic member or the reservoir. The reservoir 1448 is used to temporarily store the medium pumped out from the cavity 1422 of the elastic member 142, and can also serve to return the medium to the cavity 1422. The drive mechanism 144 includes two valves 1444, one valve 1444 is disposed between the elastic member 142 and the pump 1442, and the other valve 1444 is disposed between the pump 1442 and the reservoir 1448. It is easy to understand that a valve 1444 can also be provided only between the elastic member 142 and the pump 1442, or only between the pump 1442 and the reservoir 1448. If the valve 1444 is opened, the reservoir 1448, the pump 1442, and the cavity 1422 of the elastic member are interconnected. The pump 1442 can drive the liquid medium from the reservoir 1448 through the second channel 149 and the first channel 147 to the cavity 1422 of the elastic member, and can also drive the liquid medium in the opposite direction from the cavity 1422 of the elastic member through the first channel 147 and the second channel 149 to the reservoir 1448. When pump 1442 drives a portion of the medium in cavity 1422 to flow into reservoir 1448, the volume of elastic member 142 decreases, and the distance between the first corrective lens 120 and the second corrective lens 130 decreases accordingly, causing the overall correction power of lens module 10 to increase or decrease. When pump 1442 drives a portion of the medium in reservoir 1448 to flow into cavity 1422, the volume of elastic member 142 increases, and the distance between the first corrective lens 120 and the second corrective lens 130 increases accordingly, causing the overall correction power of lens module 10 to decrease or increase. That is, through the cooperation between pump 1442 and valve 1444, the adjusting device 140 of this embodiment can easily change the amount of liquid medium in cavity 1422, thereby changing the volume of elastic member 142, and thus changing the distance between the first corrective lens 120 and the second corrective lens 130, realizing continuous adjustment of the overall correction power of lens module 10. The adjustment device 140 has a simple structure, is easy to operate, and is small in size, which is conducive to achieving the overall lightweighting, miniaturization, and low cost of the lens module 10.

[0075] In another embodiment, the reservoir 1448 can also be an elastic member, with a material and structure similar to the elastic member 142 in the foregoing embodiments. When the elastic member 142 is in its initial state, i.e., without elastic restoring force, the volume of the cavity 1422 of the elastic member is at its minimum, and the distance between the first corrective lens 120 and the second corrective lens 130 is at its minimum. At this time, the reservoir 1448 can be in an expanded state, i.e., the inner wall of the reservoir 1448 has elastic restoring force so that the liquid medium therein tends to flow out of the reservoir. If valve 1444, located between elastic member 142 and reservoir 1448, is opened, the liquid medium, under the action of the elastic restoring force of reservoir 1448, flows successively through the second channel 149 and the first channel 147 to the cavity 1422 of the elastic member. This causes the volume of the cavity 1422 of the elastic member to gradually increase, and its elastic restoring force to gradually increase. At the same time, the volume of the cavity 1448 gradually decreases, and its elastic restoring force gradually decreases. When the elastic restoring forces of the two elastic members reach equilibrium, the liquid medium no longer flows between elastic member 142 and reservoir 1448. During this process, it is not necessary to start pump 1442; the liquid medium is driven from reservoir 1448 to elastic member 142 solely by the difference in elastic restoring forces between reservoir 1448 and elastic member 142. If the distance between the first corrective lens 120 and the second corrective lens 130 reaches the desired value, valve 1444 can be closed to prevent the liquid medium from continuing to flow to elastic member 142. After the elastic restoring forces of the two elastic members reach equilibrium, if the liquid medium is to continue flowing towards the elastic member 142 to increase the distance between the first corrective lens 120 and the second corrective lens 130, the pump 1442 needs to be activated to pump the liquid medium. Thus, the reservoir 1448 can utilize its own elasticity to drive the liquid medium towards the elastic member 142, thereby acting as a substitute for or supplement to the pump 1442 to adjust the distance between the first corrective lens 120 and the second corrective lens 130. This eliminates the need for power to drive the pump 1442 or saves power, making it both energy-efficient and convenient.

[0076] See Figure 13 and Figure 14 The lens module 10 may further include an optical waveguide 150, located between the first corrective lens 120 and the second corrective lens 130. The optical waveguide 150 includes a light guide portion 152, a coupling grating 154, and a coupling grating 156, which are spaced apart on the surface of the light guide portion 152 facing the first corrective lens 120. The coupling grating 154 receives the optical signal entering the optical waveguide 150 and couples the optical signal into the light guide portion 152. The light guide portion 152 transmits the optical signal. The coupling grating 156 receives the optical signal transmitted by the light guide portion 152 and couples the optical signal out of the optical waveguide 150. The coupling grating 156 may also be used to perform one-dimensional or two-dimensional pupil dilation on the optical signal.

[0077] The optical waveguide 150 can be, but is not limited to, a geometric waveguide or a diffractive waveguide, wherein the diffractive waveguide can be a surface-embossed diffractive waveguide or a holographic diffractive waveguide. When the optical waveguide 150 is a diffractive waveguide, it may also include a deflection grating, wherein the deflection grating, the coupling grating, and the coupling grating are all disposed on the same surface of the light guide portion 152. When the optical waveguide 150 is a geometric waveguide, the coupling grating 154 can be a reflective surface or a reflective prism, and the coupling grating 156 can be a mirror array that can be semi-transparent and semi-reflective. The surface of the optical waveguide 150 may be coated with an anti-reflection film (i.e., an anti-reflection coating) to reduce the reflection of light by the optical waveguide and increase the transmittance of the optical waveguide. The anti-reflection film may include one or more of titanium dioxide, silicon dioxide, zirconium dioxide, and silicon nitride. The anti-reflection film may be a single layer or may be multi-layered. Antireflective coatings can be formed using one or more of the following techniques: nonconductive electroplating (NCVM), evaporation coating, sputtering coating, and atomic layer deposition (ALD).

[0078] In one embodiment, the field of view (FOV) of the region with optical power of the first corrective lens 120 is greater than the FOV range of the coupling grating 156 of the optical waveguide 150, meaning the FOV of the coupling grating 156 falls within the FOV range of the first corrective lens 120. Optionally, the FOV of the region with optical power of the second corrective lens 130 is greater than the FOV range of the coupling grating 156 of the optical waveguide 150, meaning the FOV of the coupling grating 156 also falls within the FOV range of the second corrective lens 120. In this case, the lens module 10 can have a better display effect. Specifically, the field of view (FOV) range of the coupling grating 156 of the waveplate 150 can be 25° to 30°, for example, 25°, 26°, 27°, 28°, 29°, 30°, etc.; the field of view (FOV) range of the region with optical power of the first correcting lens 120 can be 27° to 32°, for example, 27°, 28°, 29°, 30°, 31°, 32°, etc.; the field of view (FOV) range of the region with optical power of the second correcting lens 130 can be 27° to 32°, for example, 27°, 28°, 29°, 30°, 31°, 32°, etc.

[0079] As shown in the figure, adhesive 160 is disposed between the optical waveguide 150 and the third surface 132 of the second corrective lens 130 to tightly bond the second corrective lens 130 to the optical waveguide 150. Adhesive 160 is also disposed between the ends of the first corrective lens 120 and the elastic member 142 to tightly bond the first corrective lens 120 to the elastic member 142. It is worth noting that adhesive 160 is not disposed between the optical waveguide 150 and the first corrective lens 120, nor between the elastic member 142 and the second corrective lens 130, to avoid affecting the elastic deformation of the elastic member 142 relative to the second corrective lens 130, which would prevent the first corrective lens 120 from displacing relative to the optical waveguide 150 (and the second corrective lens 130) along the first direction D1. Adhesive 160 can be transparent or opaque. The adhesive 160 can be made of at least one of the following materials, including but not limited to photocurable adhesives (such as UV adhesives), optical adhesives (also known as OCA adhesives), liquid optical adhesives (also known as LOCA or OCR adhesives), thermosetting adhesives, hot melt adhesives, double-sided tapes, and foam adhesives. The liquid optical adhesive can be an acrylic resin-based OCR or a silicone-based OCR. Besides the adhesive 160, other methods can be used to fix the second corrective lens 130 to the optical waveguide sheet 150 and the first corrective lens 120 to the elastic member 142. In one embodiment, the adhesive 160 can be replaced with a glue frame or glue ring, or welding can be used for fixing.

[0080] In one embodiment, the orthographic projection of the adhesive 160 along the first direction D1 falls within the range of the orthographic projection of the frame 110 along the first direction D1, such as... Figure 13 As shown. Although transparent materials can be used as adhesives for bonding, the difference in refractive index and light transmittance between the adhesive and the bonded object can affect the transparency of the visual effect. When the distribution range of the adhesive 160 is designed so that the orthographic projection of the adhesive 160 along the first direction D1 falls within the range of the orthographic projection of the frame 110 along the first direction D1, the adhesive 160 can be prevented from occupying the light-transmitting area of ​​the lens module 10, which is beneficial to improving the visual effect of the lens module 10. In another embodiment, the adhesive 160 can also be coated on the entire third surface 132 of the second corrective lens 130, and the optical waveguide 150 can be fixedly connected to the third surface 132, so that the adhesive 160 fills the space between the optical waveguide 150 and the second corrective lens 130. In this case, the optical waveguide 150 and the second corrective lens 130 are fixedly connected to each other without gaps, so that when the lens module 10 is impacted or vibrated, the two can move synchronously, thereby avoiding damage caused by mutual interference or adverse situations such as blurred vision caused by relative movement between the two.

[0081] exist Figure 13In the illustrated embodiment, the frame 110 is a one-piece structure and can be formed by injection molding, casting, or other molding methods. The frame 110 includes a lower flange extending inward along its circumference on its lower side. The first corrective lens 120, the optical waveguide sheet 150, and the second corrective lens 130 are sequentially stacked above the lower flange along a first direction D1. During assembly, the elastic member 142 can be placed first within the receiving cavity 112 of the frame 110. Then, the optical waveguide sheet 150 is fixed to the third surface 132 of the second corrective lens and placed together in the receiving cavity 112 against the lower flange of the frame 110. Finally, the first corrective lens 120 is placed within the receiving cavity 112 and connected to the upper end of the elastic member 142.

[0082] exist Figure 14 In the illustrated embodiment, the frame 110 is a split structure, including an upper first frame portion 117, a lower second frame portion 118, and a fastener 119. The fastener 119 can be, but is not limited to, at least one of screws, studs, threaded rods, etc., and is used to connect the first frame portion 117 and the second frame portion 118. The first frame portion 117 defines a receiving cavity 112 of the frame; the second frame portion 118 is detachably connected to the first frame portion 117 by the fastener 119, and protrudes radially toward the lower end of the first frame portion 117 toward the receiving cavity 112. During assembly, the first corrective lens 120 can be connected to the upper end of the elastic member 142 and placed together in the receiving cavity 112 against the first frame portion 117. Then, the optical waveguide sheet 150 is connected to the second corrective lens 130 and placed sequentially below the first corrective lens 120 in the receiving cavity 112. Finally, the second frame portion 118 is fixed to the first frame portion 117 using fasteners 119, thereby limiting the first corrective lens 120, optical waveguide sheet 150, second corrective lens 130, and elastic member 142 between the first frame portion 117 and the second frame portion 118. This allows for convenient installation and disassembly of the components in the lens module 10, and facilitates easy component replacement and maintenance. The first frame portion 117 is located in... Figure 14 The image also shows an upper flange extending inward along its circumference on the lower side, which can serve as a limiting member for the first corrective lens 120 to move upward along the first direction D1, defining the maximum possible distance between the first corrective lens 120 and the second corrective lens 130.

[0083] On the other hand, embodiments of this application provide eyeglasses, such as Figure 15 and Figure 16 As shown. The glasses 20 includes a lens module 10, which is the lens module of any of the embodiments described above, and will not be repeated here. Since the glasses 20 has the lens module 10 of any of the aforementioned embodiments, it also has the various advantages and technical effects inherent in these lens modules 10 themselves.

[0084] like Figure 15 As shown, the glasses 20 also includes temples 210, one end of which is connected to the frame 110. The drive mechanism 144 in the lens module 10 is mounted on the temples 210. The frame 110 is integrally formed and defines two receiving cavities, each containing a set of first corrective lenses 120, waveguide sheets 150, second corrective lenses 130, and elastic members 142. The two temples 210 are respectively connected to the two sides of the frame 110. In one embodiment, two frames 110, each defining one receiving cavity, can be used. A set of first corrective lenses 120, waveguide sheets 150, second corrective lenses 130, and elastic members 142 can be provided in each frame, and the two frames can be connected by components such as nose pads. By mounting the drive mechanism 144 in the lens module 10 onto the temple 210 instead of the frame 110, the volume and width of the frame 110 can be reduced, which helps to improve the aesthetics of the glasses 20. It also helps to adjust the weight distribution of the glasses 20, which helps to improve the user's wearing comfort.

[0085] like Figure 16 As shown, the glasses 20 may further include a controller 220, which is coupled to the drive mechanism 144. The controller 220 receives user commands and controls the drive mechanism 144 to adjust the spacing according to the user commands. Specifically, the drive mechanism 144 includes a pump 1442 and a valve 1444. The controller 220 can control the start and stop of the pump 1442 and control the opening degree of the valve 1444 to control the flow of medium into or out of the cavity 1422 of the elastic member, thereby changing the volume of the elastic member 142 and the spacing between the first corrective lens 120 and the second corrective lens 130. In one embodiment, the controller 220 may include a touch panel disposed on the temple 210. The user can output user commands by sliding their finger on the touch panel and instruct the controller 220 to control the drive mechanism 144 accordingly to adjust the spacing. For example, when a user slides their finger forward on the temple, the controller 220 can control the drive mechanism 144 to increase the inter-lens distance, thereby increasing the overall corrective power of the glasses; when a user slides their finger backward on the temple, the controller 220 can control the drive mechanism 144 to decrease the inter-lens distance, thereby decreasing the overall corrective power of the glasses.

[0086] In another aspect, embodiments of this application provide a wearable device, such as Figures 17 to 19As shown. The wearable device 30 includes a frame 110, which defines a receiving cavity 112. The wearable device 30 also includes a first corrective lens 120, a second corrective lens 130, an optical waveguide 150, and an adjustment device 140, wherein the first corrective lens 120 and the second corrective lens 130 are located within the receiving cavity 112 of the frame 110, the second corrective lens 130 is spaced apart from the first corrective lens 120, and the optical waveguide 150 is located between the first corrective lens 120 and the second corrective lens 130. The optical waveguide 150 includes a light guide portion 152, a coupling grating 154, and a coupling output grating 156, the coupling grating 154 and the coupling output grating 156 being spaced apart on the surface of the light guide portion 152 facing the first corrective lens 120. The adjustment device 140 is connected to at least one of the first corrective lens 120 and the second corrective lens 130, and is used to adjust the distance d between the first corrective lens 120 and the second corrective lens 130.

[0087] For details regarding the specific structure and material composition of the frame 110, the first corrective lens 120, the second corrective lens 130, and the optical waveguide 150, as well as the connection relationships between the components, please refer to the preceding text. Figures 1 to 14 The various embodiments described for the lens module 10 will not be repeated here.

[0088] Optical waveguide sheets typically have poor strength and are easily broken upon drop or impact. Therefore, to improve their lifespan, related technologies often include a protective sheet on the outer surface of the waveguide sheet. However, this protective sheet increases the thickness and weight of the wearable device, significantly impacting user comfort and resulting in a poor user experience. In the wearable device 30 provided in this embodiment, the optical waveguide sheet 150 is disposed between the first corrective lens 120 and the second corrective lens 130, which can be used to protect the optical waveguide sheet 150. This allows for the integration of AR functionality provided by the optical waveguide sheet and vision correction functionality provided by the corrective lenses into the same wearable device 30. Furthermore, the corrective lenses can be used as protective components for the optical waveguide sheet, thereby improving the impact and drop resistance of the wearable device 30, effectively reducing its size and weight, and enhancing the user experience.

[0089] For details regarding the specific structure and material composition of the regulating device 140 and its connection relationships with other components, please refer to the preceding text. Figures 1 to 14The various embodiments described for the lens module 10 will not be repeated here. However, it should be noted that, in addition to the adjustment device 140 described above, which includes the elastic member 142 and the drive mechanism 144, other mechanisms can be used as the adjustment device 140, as long as they can adjust the distance d between the first corrective lens 120 and the second corrective lens 130. For example, the adjustment device 140 may include a lead screw and a nut that cooperate with each other, with the lead screw connected to the second corrective lens 130 and the nut connected to the first corrective lens 120; when the lead screw rotates, the nut translates along the length direction of the lead screw, thereby causing the first corrective lens 120 to move closer to or away from the second corrective lens 130 along the first direction D1. The adjustment device 140 may also include a rack and a gear that cooperate with each other, with the gear connected to the second corrective lens 130 and the rack connected to the first corrective lens 120; when the gear rotates, it causes the rack to translate along the first direction D1, thereby causing the first corrective lens 120 to move closer to or away from the second corrective lens 130 along the first direction D1. The adjusting device 140 may further include two threaded caps that cooperate with each other, one threaded cap being connected to the second corrective lens 130 and the other threaded cap being connected to the first corrective lens 120; when the two threaded caps rotate relative to each other, the first corrective lens 120 moves closer to or further away from the second corrective lens 130 along the first direction D1. The adjusting device 140 may further include a piezoelectric ceramic body, with the first corrective lens 120 and the second corrective lens 130 respectively connected to the upper and lower ends of the piezoelectric ceramic body; by applying a voltage to the piezoelectric ceramic body to deform it, the distance between the first corrective lens 120 and the second corrective lens 130 along the first direction D1 is adjusted.

[0090] The wearable device 30 of this application adjusts the distance between the first corrective lens 120 and the second corrective lens 130 through the adjustment device 140, thereby continuously adjusting the overall correction power of the wearable device 30. The principle is the same as described above. Figure 5 The focusing principle described is the same. Therefore, the wearable device 30 can adaptively adjust to users with different vision correction powers, meeting the needs of different users and allowing the product to be shared among different users. Furthermore, the same user can continuously adjust the correction power of the wearable device 30 in different usage scenarios to better adapt to the needs of different situations. In addition, since the adjustment device 140 is integrated into the wearable device 30, continuous focus adjustment is achieved directly at the product level, eliminating the need to purchase additional accessories and reducing user costs.

[0091] The wearable device 30 may further include a wearable element 310 and a projection optical engine 320. The wearable element 310 is connected to the frame 110. The projection optical engine 320 is disposed on the side of the optical waveguide 150 opposite to the first corrective lens 120, and is used to project an optical signal onto the coupling grating 154 of the optical waveguide 150. The wearable element 310 may be movably connected to the frame 110 for holding a target object (such as a human head, a head prosthesis, etc.). In one embodiment, the wearable device 30 may be augmented reality glasses, and correspondingly the wearable element 310 may be... Figure 15 The temples shown may be elastic bands for the user to wear on their head. Wearable device 30 may also be an augmented reality helmet, and correspondingly, wearing piece 310 may be the main body of the augmented reality helmet. Projection optical engine 320 or adjustment device 140 may be set on wearing piece 310 to reduce the size of frame 110 and frame width, thereby achieving the overall portability and miniaturization of wearable device 30.

[0092] The projection optical engine 320 includes a display 322 and a lens 324. The display surface of the display 322 faces the optical waveguide 150 and is used to emit light signals. The lens 324 is disposed between the display 322 and the optical waveguide 150 and is used to modulate the light signals. In one embodiment, the display 322 may include, but is not limited to, at least one of a micro light-emitting diode (Micro LED) chip, a micro organic light-emitting diode (Micro OLED) chip, or a micro liquid crystal display (Micro LCD). The lens 324 may be a micro projection lens used to modulate the light signals emitted by the display 322, so that light rays emitted from different field of view angles from the same pixel are emitted in parallel after modulation, so that the image information in the light signal can be viewed by the naked eye. It is worth noting that when both corrective lenses are concave or convex lenses, since the power of the second corrective lens 130, which is positioned closer to the eye, is lower than the overall corrective power of the wearable device 30, it is necessary to compensate for the power of the image on the waveguide 150 accordingly so that the image can match the user's eye power.

[0093] See Figure 19The wearable device 30 may also include a processor 330 and a memory 340. The processor 330 is coupled to the projection optical engine 320 and is used to control the display 322 to emit light signals carrying image information. The processor 330 is also coupled to the adjustment device 140 in the lens module 10 to control the adjustment device 140 to adjust the distance between the first corrective lens 120 and the second corrective lens 130 along a first direction D1, thereby adjusting the overall correction power of the lens module 10. The memory 340 is electrically connected to the processor 330 and is used to store the program code required for the processor 330 to run, so as to control the display 322 and the adjustment device 140, etc. In one embodiment, the processor 330 may include any device capable of processing electronic instructions, including a central processing unit (CPU), microprocessor, microcontroller, main processor, controller, and ASIC, etc. Memory 340 may include volatile memory, such as random access memory (RAM); it may also include non-volatile memory (NVM), such as read-only memory (ROM), flash memory (FM), hard disk drive (HDD), or solid-state drive (SSD). Processor 330 is used to execute various types of digital storage instructions, such as software or firmware programs stored in memory 340.

[0094] The term "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with one embodiment may be included in at least one other embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A lens module, characterized in that, include: A frame, the frame defining a receiving cavity; A first corrective lens, wherein the first corrective lens is located within the receiving cavity; The second corrective lens is located within the receiving cavity and is disposed opposite to the first corrective lens; as well as An adjustment device includes a drive mechanism and an elastic member with a cavity. The elastic member is disposed in the frame and connected to at least one of the first corrective lens and the second corrective lens. The drive mechanism is used to drive a medium to flow into or out of the cavity to deform the elastic member, thereby moving at least one of the first corrective lens and the second corrective lens, thereby changing the distance between the first corrective lens and the second corrective lens.

2. The lens module according to claim 1, characterized in that, The first corrective lens is a myopia lens or a hyperopia lens, and has a first surface facing away from the second corrective lens and a second surface facing the second corrective lens, wherein the first surface is a convex surface, the second surface is a concave surface or a plane, and the radius of curvature of the first surface is different from the radius of curvature of the second surface.

3. The lens module according to claim 1, characterized in that, The second corrective lens is a myopia lens or a hyperopia lens, and has a third surface facing the first corrective lens and a fourth surface facing away from the first corrective lens, wherein the third surface is a plane and the fourth surface is a concave or convex surface.

4. The lens module according to claim 1, characterized in that, One of the first corrective lens and the second corrective lens is fixed to the frame; the other of the first corrective lens and the second corrective lens is connected to one end of the elastic member and is movable relative to the frame in a first direction.

5. The lens module according to claim 4, characterized in that, The second corrective lens is fixed to the frame; the first corrective lens is fixed to one end of the elastic member and is slidably connected to the frame through the cooperation of a protrusion and a groove, wherein the protrusion protrudes along a second direction in one of the first corrective lens and the frame, and the groove is recessed along the second direction in the other of the first corrective lens and the frame, the second direction intersecting the first direction.

6. The lens module according to claim 4, characterized in that, The frame is provided with a receiving hole extending along the first direction, and the elastic member is embedded in the receiving hole.

7. The lens module according to claim 1, characterized in that, The elastic member is annular, and one or more of the driving mechanisms are used to drive the medium to flow into or out of the cavity of the elastic member.

8. The lens module according to claim 1, characterized in that, The elastic member is provided in multiple ways, and the multiple elastic members are spaced apart along the circumferential direction of the frame. One of the driving mechanisms is used to drive the medium to flow into or out of the cavity of at least one of the elastic members.

9. The lens module according to any one of claims 1 to 8, characterized in that, The elastic member includes a capsule-shaped component integrally formed of an elastomeric material, wherein the elastomeric material includes at least one of silicone, rubber, thermoplastic polyurethane, polydimethylsiloxane, polyethylene terephthalate, polycarbonate, and polymethyl methacrylate.

10. The lens module according to any one of claims 1 to 8, characterized in that, The elastic member includes a first diaphragm, a second diaphragm, and an elastic cylinder connected between the first diaphragm and the second diaphragm, wherein the first diaphragm, the second diaphragm, and the elastic cylinder surround and form the cavity; or The elastic member includes an elastic cylinder connected between the first corrective lens and the second corrective lens, wherein the first corrective lens, the second corrective lens, and the elastic cylinder surround and form the cavity. The elastic cylinder is formed of an elastomeric material, or a spring is embedded in the wall of the elastic cylinder.

11. The lens module according to any one of claims 1 to 8, characterized in that, The driving mechanism includes a pump and a valve. One end of the pump is connected to the cavity of the elastic member via a first channel. The valve is used to regulate the flow rate of the medium when it flows into or out of the cavity. The pump is a piezoelectric ceramic pump, and the valve is a solenoid valve.

12. The lens module according to claim 11, characterized in that, The medium is gas; the other end of the pump is connected to the external space.

13. The lens module according to claim 11, characterized in that, The medium is a liquid; the drive mechanism also includes a reservoir, the other end of the pump is connected to the reservoir via a second channel, and the valve is used to regulate the flow rate of the medium when it flows between the cavity of the elastic member and the reservoir.

14. The lens module according to any one of claims 1 to 8, characterized in that, The lens module further includes an optical waveguide sheet located between the first corrective lens and the second corrective lens. The optical waveguide sheet includes a light guide portion, an input grating, and an output grating. The input grating and the output grating are spaced apart on the surface of the light guide portion facing the first corrective lens.

15. A pair of eyeglasses, characterized in that, include: The lens module as described in any one of claims 1 to 14; as well as The temple has one end connected to the frame of the lens module, and the drive mechanism of the lens module is mounted on the temple.

16. A wearable device, characterized in that, include: A frame, the frame defining a receiving cavity; A first corrective lens, wherein the first corrective lens is located within the receiving cavity; The second corrective lens is located within the receiving cavity and is spaced apart from the first corrective lens; An optical waveguide is located between a first corrective lens and a second corrective lens. The optical waveguide includes a light guide portion, an insertion grating, and an output grating. The insertion grating and the output grating are spaced apart on the surface of the light guide portion facing the first corrective lens. as well as An adjustment device, connected to at least one of the first corrective lens and the second corrective lens, is used to adjust the distance between the first corrective lens and the second corrective lens; The adjustment device includes a drive mechanism and an elastic member with a cavity. The elastic member is disposed in the frame and connected to at least one of the first corrective lens and the second corrective lens. The drive mechanism is used to drive the medium to flow into or out of the cavity to deform the elastic member, thereby moving at least one of the first corrective lens and the second corrective lens, thereby changing the distance between the first corrective lens and the second corrective lens.

17. The wearable device according to claim 16, characterized in that, The wearable device also includes: Wearing device, the wearing device being connected to the frame; and A projection optical engine is disposed on the side of the optical waveguide away from the first corrective lens, and is used to project an optical signal onto the coupling grating of the optical waveguide.

18. The wearable device according to claim 16, characterized in that, The drive mechanism includes a pump and a valve. One end of the pump is connected to the cavity of the elastic member via a first channel, and the valve is used to regulate the flow rate of the medium when it flows into or out of the cavity.

19. The wearable device according to claim 18, characterized in that: The medium is gas, and the other end of the pump is connected to the external space; or The medium is a liquid, the drive mechanism also includes a reservoir, the other end of the pump is connected to the reservoir via a second channel, and the valve is used to regulate the flow rate of the medium when it flows between the cavity of the elastic member and the reservoir.

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