Method for bonding a film to a lens

Abstract

A method for bonding a film to a lens and a device for bonding a film to a lens are provided. To gradually bond the film to the lens from the middle position to the edge position, the first and second jigs are controlled to move relative to each other. This reduces air bubbles between the film and the lens, achieving a good film bonding effect. Additionally, there is no need to process the film in advance, and there is no need to obtain the lens through injection molding after the film is formed. This ensures the optical and mechanical performance of the bonded film. By using a simple method for bonding the film to the lens, the required optical elements can be obtained, and the optical and mechanical performance of the optical elements obtained by bonding the film to the lens can be guaranteed.

Description

[Technical field]

[0001] This application relates to the field of film material bonding technology, and in particular to a method for bonding a film to a lens. [Background technology]

[0002] In the field of optical imaging, in order to improve the imaging effect of an optical lens, a film is often required to be bonded to an optical lens. In order to achieve a flat film bonding effect, currently, the main manner of bonding a film to a lens is: bonding a flat film to the surface of a thin sheet substrate, performing hot bending on the whole formed by the film and the substrate, and placing the hot-bent thin sheet in an injection molding jig. After the optical material is injection molded, an optical element having optical properties consistent with the film may be obtained. However, due to the properties of the film, after the film is hot-bent, it is very likely that the film will be stretched and cannot retain the shape before the initial bending. As a result, the surface precision of the optical element finally obtained will be affected. In addition, the temperature of the injection molded optical material is generally high, so that the optical performance or mechanical performance of the film is likely to be affected. Summary of the Invention

[0003] In order to obtain an optical element with high surface shape accuracy, ensure the optical and mechanical performance of the film, and ensure that the optical element finally obtained through bonding can have good quality, the present application provides a method for bonding a film to a lens.

[0004] According to a first aspect, the present application provides a method for bonding a film to a lens. The method for bonding the film to the lens is Fixing the lens in a first fixture; securing the film to a second fixture, where the second fixture is a deformable and flexible fixture; obtaining full aperture boundary information of the lens and aligning the lens with a first fixture; obtaining full aperture boundary information of the film and aligning the film with a second fixture; and Controlling the first and second jigs to move relative to each other to gradually bond the film from the middle position to the edge position on the lens. Equipped with.

[0005] In the present application, by using the method for bonding a film, the flat film can be bonded to the lens by gradually contacting the lens from the middle position to the edge position, so that the flat film from the middle position to the edge position can be uniformly deformed, thereby avoiding the case that the optical performance and mechanical performance, etc. of the film change after the flat film is bonded to the lens, and therefore the optical performance and mechanical performance of the optical element finally obtained through bonding are not affected. In addition, the method for bonding a film of the present application is easy to operate, and does not require first heating the flat film to make it into a curved film with an ideal shape through the process of heating, pressure maintenance, stretching, softening, etc., and then bonding the curved film to the lens, thereby simplifying the bonding method and avoiding the case that the optical performance or mechanical performance of the bonded film is affected due to the process of heating, pressure maintenance, stretching, softening, etc.

[0006] In addition, the film is gradually bonded from the middle position to the edge position on the lens, so that the air bubbles between the film and the lens can be easily discharged, thereby ensuring the quality of the bond between the film and the lens.

[0007] In addition, in the present application, boundary information of the full aperture of the lens is obtained to align the lens with the first fixture; and In order to align the film with the second fixture, the boundary information of the full aperture of the film is obtained. Compared with the method in which only some positions of the film and the lens are identified and aligned, in this implementation example of the present application, the boundary information of the full aperture of the film and the boundary information of the full aperture of the lens are obtained to ensure the accuracy of the alignment between the film and the second fixture and the accuracy of the alignment between the lens and the first fixture.

[0008] In some implementations of the present application, before the step of gradually bonding the film from a middle position on the lens to an edge position, the method further includes the step of heating the film by using a second fixture.

[0009] In this embodiment of the present application, by heating the film, the film can be softened, so that the film can be better bonded to the film-bearing zone. In addition, in the process of bonding the film to the lens, the film can be more easily deformed after heating, so that the film can be bonded flat to the surface of the lens, thereby avoiding problems such as wrinkles that occur when the film is bonded to the film bonding surface of the lens. In addition, in this embodiment of the present application, in order to ensure that all positions on the film can have the same deformation ability and avoid wrinkles or changes in the optical axis direction caused by uneven stretching of all positions of the film, all positions on the film can be heated evenly by using the second jig, thereby ensuring the quality of the optical element finally obtained by bonding the film. In addition, the film is heated by using the second jig. Since the second jig has a certain heat maintaining function, the film can be heated in the entire bonding process, ensuring that the film can always be in a heated state in the process of bonding the film to the lens, thereby achieving a better bonding effect. In addition, because the second fixture has a certain heat maintaining effect, after the film heater is stopped, the second fixture can still continuously heat the film, thereby reducing energy consumption.

[0010] In some implementations, before gradually bonding the film from a midpoint on the lens to an edge position, the method includes: Heating the lens by using a first fixture to allow the temperature difference between the lens and the film to be less than 30° before the lens and the film are bonded. It further comprises:

[0011] In this embodiment of the present application, the lens is heated to ensure that the stress between the film and the lens can be small after the film and the lens are bonded and cooled, thereby ensuring the stability of the bond between the film and the lens, so that the temperature difference between the film and the lens can be reduced in the process of bonding the film to the lens. In some implementations, the temperature difference between the lens and the film is less than 30°, so that the stability of the bond between the film and the lens can be effectively guaranteed. In this embodiment of the present application, by using a first fixture, all positions on the lens are heated evenly in order to ensure the temperature balance between positions on the lens in the process of bonding the film to the lens.

[0012] In some implementations, the boundary information of the full aperture of the lens is obtained by using a first alignment camera, the field of view of the first alignment camera covering the full aperture of the lens; and The boundary information of the full aperture of the lens is obtained by using a second alignment camera, whose field of view covers the full aperture of the film.

[0013] Since the shooting range of the first alignment camera can cover the full aperture of the lens, the boundary information of the full aperture of the lens can be obtained by using the first alignment camera, and the center position on the lens can be obtained more accurately to ensure the accuracy of the alignment between the lens and the first jig. Since the shooting range of the second alignment camera can cover the full aperture of the film, the boundary information of the full aperture of the film can be obtained by using the second alignment camera, and the center position on the film can be obtained more accurately to ensure the accuracy of the alignment between the film and the second jig.

[0014] In some implementations, a method for bonding a film to a lens includes removing the lens from a first fixture and removing the film from a second fixture; and performing a degassing process on the lens to which the film is bonded in order to remove air bubbles between the film and the lens; It further comprises:

[0015] In this implementation, by performing a degassing process on the lens to which the film is bonded, the air bubbles between the film and the lens can be further removed, thereby further improving the effect of bonding the film to the lens.

[0016] In some implementations, the degassing process includes: placing the lens having the film bonded thereto in a defoaming jig, and performing a pressure maintenance and a heat maintenance process on the lens having the film bonded thereto, wherein during the pressure maintenance and heat maintenance processes, the pressure is 0.1 MPa to 1 MPa, the temperature is 40°C to 80°C, and the heat maintenance and pressure maintenance time is 5 minutes to 1 hour; In this embodiment, to ensure the effect of bonding between the lens and the film, the air bubbles between the lens and the film can be sufficiently removed through sufficient pressure maintenance and heat maintenance treatment.

[0017] In some implementations, in order to avoid the case where the excess of the film needs to be cut through another process (e.g., laser cutting) after the film is bonded, thereby reducing the manufacturing process, the size of the film is the same as or smaller than the clear aperture of the lens. In addition, it can be further ensured that wrinkles do not easily occur when the film is bonded to the lens.

[0018] In some implementations, the second fixture includes a film-carrying zone, the film is secured to the film-carrying zone, and the surface of the lens to which the film is bonded is the film bonding surface; and When the film bonding surface of the lens is concave, the film carrying zone of the second jig is convex and the radius of curvature of the film carrying zone is smaller than the radius of curvature of the film bonding surface; or when the film bonding surface of the lens is convex, the film carrying zone of the second jig is flat or concave and the radius of curvature of the film carrying zone is larger than the radius of curvature of the film bonding surface.

[0019] In this implementation example, to ensure that the film can be gradually bonded to the lens from an intermediate position to an edge position regardless of whether the film bonding surface of the lens is concave or convex, thereby ensuring the film bonding quality of the lens, the second jig has a film carrying zone of a corresponding shape for different film bonding surface shapes of the lens.

[0020] In some implementations, the film bearing zone is provided with an array of vacuum holes, and the film is secured to the film bearing zone by using the vacuum attraction of the vacuum holes.

[0021] In some implementations, to ensure good film bonding effect, the effective aperture of the lens ranges from 1 mm to 60 mm to ensure that the film can be bonded flat to the bonding surface of the lens without generating wrinkles.

[0022] In some implementations, to ensure that no wrinkles are generated when the film is bonded to the lens, if the film bonding surface of the lens is convex, the ratio of the radius of curvature of the film bonding surface to the bonding aperture of the film bonding surface is greater than 1.2; or if the film bonding surface of the lens is concave, the ratio of the radius of curvature of the film bonding surface to the bonding aperture of the film bonding surface is greater than 1.5.

[0023] In some implementations, the surface of the lens to which the film is bonded is a film bonding surface, and the surface shape of the film bonding surface is a spherical surface, an aspheric surface, or a free-form inverse surface.

[0024] In some implementations, the step of fixing the film to the second fixture includes: Fixing the film on a carrier film; clamping the carrier film on both sides of the film by using clamping members and facing the film to a second fixture, where an orthogonal projection of the second fixture on a plane in which the film is located covers the film; and controlling the carrier film and the second fixture to move relative to each other until the film on the carrier film is bonded to the second fixture; has.

[0025] In this implementation, by carrying the film through the carrier film, the film can be protected from being easily damaged in the subsequent process of being transferred to the film carrying zone of the second fixture, and the film can be transferred more easily.

[0026] In some implementations, prior to controlling the first fixture and the second fixture to move relative to one another, the method further comprises: obtaining full aperture boundary information of the lens and full aperture boundary information of the film to further improve the accuracy of splicing the film to the lens, and aligning the lens with the film; It further comprises:

[0027] In some implementations, prior to controlling the first fixture and the second fixture to move relative to one another, the method further comprises: performing a surface activation treatment on the surface of the lens It further comprises:

[0028] In this implementation example of the present application, after the film is bonded, in order to ensure that there are no impurities between the lens and the film and to ensure the film bonding quality, a surface activation treatment is performed on the lens, so that the film can be more firmly adhered to the surface of the lens and the surface of the lens can be cleaned.

[0029] According to a second aspect, the present application further provides a device for splicing a film to a lens, the device for splicing a film to a lens comprising a memory, a processor and a program for splicing a film to a lens, the program for splicing a film to a lens being stored in the memory and operable on the processor, the program for splicing a film to a lens being executed by the processor to implement said method for splicing a film to a lens.

[0030] The device for bonding a film to a lens provided in the present application can perform the above-mentioned method for bonding a film to a lens. Thus, through the device for bonding a film to a lens of the present application, the flat film can be bonded to the lens by gradually coming into contact with the lens from the middle position to the edge position, so that the flat film from the middle position to the edge position can be evenly deformed, thereby avoiding the case that the optical performance and mechanical performance, etc. of the film change after the flat film is bonded to the lens, and therefore the optical performance and mechanical performance of the optical element finally obtained through bonding are not affected. The method for bonding a film performed through the device for bonding a film to a lens of the present application is easy to operate, and does not require first heating the flat film to make it into a curved film with an ideal shape through the process of heating, pressure maintenance, stretching, softening, etc., and then bonding the curved film to the lens, thereby simplifying the bonding method and avoiding the case that the optical performance or mechanical performance of the bonded film is affected due to the process of heating, pressure maintenance, stretching, softening, etc.

[0031] In addition, through the device for bonding a film to a lens of the present application, air bubbles between the film and the lens can be easily discharged, thereby ensuring the quality of bonding between the film and the lens. In order to ensure the accuracy of alignment between the film and the second jig and the accuracy of alignment between the lens and the first jig, in the process of bonding the lens to the film, the boundary information of the full aperture of the lens and the boundary information of the full aperture of the film can be obtained. [Brief description of the drawings]

[0032] In order to more clearly describe the structural attitude and function of the present application, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] [Figure 1] FIG. 1 is a schematic diagram of a structure of a device for bonding a film to a lens according to an implementation example of the present application;

[0034] [Diagram 2] FIG. 2 is a schematic diagram of a structure of a device for bonding a film to a lens according to another implementation of the present application;

[0035] [Diagram 3] FIG. 2 is a schematic diagram of a state in which a lens and a film are bonded together, when the film bonding surface of the lens is a convex surface and the film-carrying zone of the second jig is a flat surface;

[0036] [Figure 4] FIG. 2 is a schematic diagram of a state in which a lens and a film are bonded together, when the film bonding surface of the lens is a convex surface and the film-carrying zone of the second jig is a concave surface;

[0037] [Diagram 5] FIG. 2 is a schematic diagram of a state in which a lens and a film are bonded together, when the film bonding surface of the lens is a concave surface and the film-carrying zone of the second fixture is a convex surface;

[0038] [Figure 6] FIG. 2 is a schematic diagram of a state in which a lens and a film are bonded together, when the film bonding surface of the lens is flat and the film-carrying zone of the second fixture is convex;

[0039] [Figure 7] 1 is a schematic flowchart of a method for bonding a film to a lens, in accordance with some implementations of the present application;

[0040] [Figure 8] FIG. 3 is a flow chart of a specific operation of fixing a film to a second fixture when the film is bonded to a lens through the device for bonding a film of FIG. 2; and

[0041] [Figure 9] FIG. 2 is a schematic diagram of an operational module of a device for bonding a film to a lens, according to an implementation of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0042] The following describes the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application.

[0043] In order to bond the film to the lens, the present application provides a method for bonding the film to the lens, which can avoid defects such as air bubbles or wrinkles between the film and the curved cover plate, and can ensure the surface shape accuracy, optical performance and mechanical performance of the optical element obtained by bonding the film to the lens.

[0044] In the present application, the optical element obtained by bonding the film to the lens may be applied to various types of terminals. For example, in some implementations of the present application, the terminal may be an Augmented Reality (AR) eyeglasses, a Virtual Reality (VR) eyeglasses, a mobile phone, a tablet, or a camera, etc.

[0045] In the present application, the film may be any type of film. For example, the film may be an optical film having an optical axis, such as a reflective polarizing film, a quarter wave plate, or a half wave plate, or may be various types of optical films, such as an anti-reflection film, an anti-scratch film, a light scattering film, and an anti-fog film. In the present application, by bonding different types of films to a lens, the optical performance or mechanical performance of the optical element obtained by bonding the film to the lens may be correspondingly improved. In some implementations of the present application, the thickness of the film is 0.02 mm to 0.5 mm, so that the optical performance or mechanical performance of the optical element obtained by bonding the film to the lens may be improved, and the case where the optical performance of the optical element, such as thickness and light transmittance, is affected by the excessively large thickness of the film may be avoided.

[0046] In the present application, a film is bonded to a lens through a device for bonding a film to a lens. Referring to FIG. 1, FIG. 1 is a schematic diagram of a structure of a device 100 for bonding a film to a lens according to an implementation example of the present application. In this implementation example, a film 200 is bonded to a lens 300 through the device 100 for bonding a film to a lens. Specifically, in this implementation example, the device 100 for bonding a film to a lens includes a first jig 10, a second jig 20, and a driving mechanism 30. The first jig 10 may be configured to fix the lens 300, the second jig 20 may be configured to fix the film 200, and the driving mechanism 30 may be configured to drive the first jig 10 and the second jig 20 to move relative to each other, and move the lens 300 fixed to the first jig 10 and the film 200 fixed to the second jig 20 relative to each other, thereby bonding the film 200 to the lens 300.

[0047] Specifically, in this implementation example of the present application, the first jig 10 is a highly rigid jig and can stably fix the lens 300. Specifically, in some implementation examples of the present application, the first jig 10 may be made of a material that has a certain strength and is not easily deformed, such as plastic (such as heat-resistant nylon plastic), metal (such as aluminum or iron), alloy (such as aluminum alloy), or ceramic.

[0048] In some implementations, the first fixture 10 is a rigid fixture and the lens 300 is clamped and fixed to the first fixture 10. It will be appreciated that in other implementations of the present application, the first fixture 10 may alternatively be another fixed structure. For example, in some implementations, a vacuum suction zone may be disposed within the lens attachment zone 11 of the first fixture 10 and the lens 300 may be fixed to the first fixture 10 through vacuum suction. Alternatively, in some implementations, the first fixture 10 includes a snap-fit ​​portion and the lens 300 is tightly snap-fitted and fixed to the first fixture 10 by using the snap-fit ​​portion.

[0049] The second jig 20 is a deformable and flexible jig for convenience in subsequent bonding of the film 200 to the lens 300. Specifically, in this implementation, the manufacturing material of the second jig 20 may be a flexible material such as rubber or silicone.

[0050] In this implementation of the present application, the first fixture 10 includes a lens mounting zone 11, and the lens 300 is mounted within the lens mounting zone 11. The second fixture 20 includes a film carrying zone 21, and the film 200 is fixed within the film carrying zone 21. In this implementation, the film carrying zone 21 and the lens mounting zone 11 are disposed opposite each other, so that the film 200 fixed within the film carrying zone 21 can be accurately bonded to the lens 300.

[0051] In some implementations, the size of the lens mounting zone 11 may be correspondingly adjusted depending on the size of the lens 300 to be mounted in order to secure lenses 300 of different sizes.

[0052] In some implementations of the present application, the surface of the lens mounting zone 11 of the first jig 10 may be further covered with a protective layer such as Teflon. In order to avoid damage to the lens 300 when the first jig 10 fixes the lens 300, the lens 300 comes into contact with the protective layer when fixed to the first jig 10. In addition, in some implementations of the present application, the shape of the surface of the protective layer away from the first jig 10 is substantially the same as the shape of the surface of the lens 300 facing the first jig 10. Specifically, in order to ensure that the first jig 10 can properly support and restrict the lens 300, and to further ensure that the lens 300 can be stably fixed to the first jig 10, the surface of the lens 300 may be substantially bonded to the protective layer when the lens 300 is fixed to the first jig 10.

[0053] In some implementations of the present application, the vacuum holes 22 arranged in an array are arranged in the film-carrying zone 21. The vacuum holes 22 can be connected to a vacuum device to generate a vacuum suction force to suction and fix the film 200 to the film-carrying zone 21. It is understood that in some other implementations of the present application, the film 200 may alternatively be fixed to the film-carrying zone 21 in some other manners. For example, refer to FIG. 2, which is a schematic diagram of a structure of a device 100 for bonding a film to a lens according to another implementation of the present application. In the implementation shown in FIG. 2, the film 200 is fixed to a carrier film 400, and the device 100 for bonding a film to a lens further includes a clamp member 500. In order to taut the carrier film 400 carrying the film 200, the clamp member 500 clamps the carrier film 400 on both sides of the film 200. The clamping member 500 can move relative to the second fixture 20 until the carrier film 400 comes into contact with the film carrying zone 21 of the second fixture 20, and the portion of the carrier film 400 carrying the film 200 is tensioned and bonded to the film carrying zone 21 to secure the film 20 to the film carrying zone 21. In some implementations, the film carrying zone 21 is provided with an array of vacuum holes 22, and the device 100 for bonding a film to a lens also includes the clamping member 500, and the film 200 is fixed to the carrier film 400. Through the combined action of the suction force of the vacuum holes 22 and the tensioning force of the carrier film 400 driven by the clamping member 500, the position on the carrier film 400 corresponding to the film carrying zone 21 is fixed to the film carrying zone 21, so that the film 200 carried on the carrier film 400 is fixed to the film carrying zone 21. In this implementation example, due to the coordinated action of the suction force of the vacuum hole 22 and the clamping function of the clamping member 500, the position on the carrier film 400 corresponding to the film supporting zone 21 can be firmly and stably bonded by the film supporting zone 21, and as a result, the film 200 can be firmly and stably bonded by the film supporting zone 21.

[0054] It should be noted that in some implementations of the present application, the film 200 is fixed to the carrier film 400. After the film 200 is bonded to the lens 300, the carrier film 400 can be easily peeled off from the film 200. For example, in some implementations, the film 200 is fixed to the carrier film 400 through a photosensitive adhesive. After the film 200 is bonded to the lens 300, the film 200 can be easily peeled off from the carrier film 400 through exposure to ultraviolet light to obtain the required photonic components.

[0055] In this implementation of the present application, the first fixture 10 and the second fixture 20 are disposed opposite each other, such that the lens 300 fixed to the first fixture 10 faces the film 200 fixed to the second fixture 20. By moving the first fixture 10 and the second fixture 20 relative to each other, the film 200 can be bonded to the lens 300. In this implementation, the first fixture 10 is located above the second fixture 20, and the first fixture 10 can move toward the second fixture 20. It will be understood that in another implementation of the present application, the second fixture 20 can alternatively be located above the first fixture 10, and the second fixture 20 can alternatively move toward the first fixture 10.

[0056] It will be appreciated that in some other implementations of the present application, the first fixture 10 and the second fixture 20 may alternatively be positioned in another positional relationship. For example, in some implementations, the first fixture 10 and the second fixture 20 may alternatively be positioned parallel to each other. In a subsequent process of bonding the film 200 to the lens 300, the second fixture 20 may be flipped over so that the second fixture 20 is positioned opposite the first fixture 10.

[0057] In this implementation example of the present application, in order to ensure that a good bonding effect can be achieved when the film 200 supported on the film supporting zone 21 is bonded to the lens 300, the shape of the film supporting zone 21 of the second jig 20 matches the shape of the film bonding surface of the lens 300.

[0058] Specifically, the lens 300 includes a light entrance surface 301 and a light emission surface 302 that are disposed opposite to each other. Light enters the lens 300 through the light entrance surface 301 and is emitted through the light emission surface 302. In this implementation of the present application, the lens 300 includes a film bonding surface, and the film 200 is bonded to the film bonding surface. In some implementations, the film bonding surface of the lens 300 may be the light entrance surface 301 or the light emission surface 302. Specifically, the film 200 is bonded to the light entrance surface 301 or the light emission surface 302. In this case, there is only one film bonding surface of the lens 300. In some other implementations, both the light entrance surface 301 and the light emission surface 302 of the lens 300 may be film bonding surfaces. In other words, a film may be bonded to each of the light entrance surface 301 and the light emission surface 302 of the lens 300. In this case, there are two film bonding surfaces of the lens 300. In the present application, when the lens 300 is fixed to the first jig 10, the film bonding surface of the lens 300 where the film bonding needs to be performed is away from the first jig 10 so as to facilitate bonding of the film 200 to the film bonding surface of the lens 300.

[0059] In this application, the film interface of the lens 300 may be a spherical, aspheric, or free-form surface. A free-form surface indicates that there is only one vertex on each side of the film interface. For example, the free-form surface may be a concave or convex surface, or a free-form surface with flat edges and concave or convex intermediate zones.

[0060] In some implementations, the film bonding surface of the lens 300 is a convex surface, and the film carrying zone 21 of the second jig 20 may be a flat surface or a concave surface. When the film carrying zone 21 of the second jig 20 is a concave surface, the radius of curvature of the film carrying zone 21 is larger than the radius of curvature of the film bonding surface of the lens 300. Referring to Figures 3 and 4, Figure 3 is a schematic diagram of bonding the lens 300 and the film 200 when the film bonding surface of the lens 300 is a convex surface and the film carrying zone 21 of the second jig 20 is a flat surface; and Figure 4 is a schematic diagram of bonding the lens 300 and the film 200 when the film bonding surface of the lens 300 is a convex surface and the film carrying zone 21 of the second jig 20 is a concave surface. When the film bonding surface of the lens 300 is convex, the film carrying zone 21 of the second jig 20 is flat or concave, and the radius of curvature of the film carrying zone 21 is greater than the radius of curvature of the film bonding surface of the lens 300, when the first jig 10 and the second jig 20 are close to each other and the lens 300 fixed on the first jig 10 is bonded to the film 200 fixed on the second jig 20, the film 200 can be gradually bonded to the lens 300 from the central zone to the edge zone, so that the air between the film 200 and the lens 300 can be better removed, and it can be ensured to avoid generating air bubbles in the process of bonding the film 200 to the lens 300.

[0061] In some implementations, when the film bonding surface of the lens 300 is concave, the film carrying zone 21 of the second jig 20 is convex, and the radius of curvature of the film carrying zone 21 is smaller than the radius of curvature of the film bonding surface of the lens 300. In some implementations, in order to reduce the risk of generating a central air bubble when the film 200 is bonded to the lens 300, the radius of curvature of the central position on the film carrying zone 21 may be smaller than 1.5 times the radius of curvature of the film bonding surface which is concave. Referring to FIG. 5, FIG. 5 is a schematic diagram of bonding the lens 300 and the film 200 when the film bonding surface of the lens 300 is concave and the film carrying zone 21 of the second jig 20 is convex. When the film bonding surface of the lens 300 is concave, the film carrying zone 21 of the second jig 20 is convex, and the radius of curvature of the film carrying zone 21 is smaller than the radius of curvature of the film bonding surface of the lens 300, when the first jig 10 and the second jig 20 are close to each other and the lens 300 fixed on the first jig 10 is bonded to the film 200 fixed on the second jig 20, the film 200 from the central zone to the edge zone is gradually bonded to the lens 300, so that the air between the film 200 and the lens 300 can be better removed, and it can be ensured to avoid generating air bubbles in the process of bonding the film 200 to the lens 300.

[0062] It is understood that in some implementations of the present application, the bonding surface of the lens 300 may alternatively be flat. In this case, the film carrying zone 21 of the second jig 20 may be convex. Referring to FIG. 6, FIG. 6 is a schematic diagram of bonding the lens 300 and the film 200 when the film bonding surface of the lens 300 is flat and the film carrying zone 21 of the second jig 20 is convex. When the bonding surface of the lens 300 is flat and the film carrying zone 21 of the second jig 20 is convex, the film 200 carried on the film carrying zone 21 may preferentially come into contact with the central zone of the lens 300. In the process of the first jig 10 and the second jig 20 approaching each other further, the film 200 from the central zone to the edge zone is gradually bonded to the lens 300, so that the air between the film 200 and the lens 300 can be better removed, and the film 200 is avoided from generating air bubbles in the process of bonding the film 200 to the lens 300.

[0063] In this implementation of the present application, the film 200 is a flat film. In some implementations, the size of the film 200 is the same as or slightly smaller than the effective aperture of the lens 300, in order to avoid the case where the excess of the film 200 needs to be cut through another process (e.g., laser cutting) after the film 200 is bonded, thereby reducing the manufacturing process. In addition, it can be further ensured that wrinkles do not easily occur when the film 200 is bonded to the lens 300. For example, in some implementations of the present application, when the flat lens 300 is flat at the edge and concave or curved at the middle position, and the diameter of the film 200 is smaller than the effective aperture of the lens 300, the film 200 does not cover the edge of the lens 300, but only covers the middle position on the lens 300, thereby ensuring that the required optical effect can be achieved and avoiding the problem of air bubbles being generated because the curvature from the middle position to the edge position covered by the film 200 changes rapidly. It should be noted that in this implementation of the present application, the effective aperture of the lens 300 is the aperture of the lens part lens that can perform the actual optical function. For example, if the lens 300 is flat at the edge and concave or curved at the middle position, generally, the edge flat part of the lens is a support structure for facilitating the mounting of the lens and does not actually affect the transmission in the light path, and the middle concave or convex part of the lens 200 actually affects the light path. Therefore, the effective aperture of the lens 200 is the aperture of the middle concave or convex part of the lens 200. In addition, it should be noted that the lens 300 of the present application may be a circular lens or a lens of another shape such as a square lens. This specification does not particularly limit this. The shape of the film 200 is the same as that of the lens 300. In addition, the size of the film 200 being the same as or slightly smaller than the effective aperture of the lens 300 specifically means that the size of the film in each direction is the same as or slightly smaller than the size of the lens 300 in each corresponding direction. For example, in some implementations of the present application, both the lens 300 and the film 200 are circular.The size of the film 200 is the same as or slightly smaller than the clear aperture of the lens 300 , that is, the diameter of the film 200 is smaller than or equal to the clear aperture of the lens 300 .

[0064] In some implementations of the present application, the effective aperture of the lens 300 ranges from 1 mm to 60 mm. In this implementation of the present application, the film 200 is a flat film, so the flat film is bonded to the bonding surface of the lens 300. If the bonding surface of the lens 300 is a curved surface, the film 200 is deformed to a certain extent to ensure that each position on the film 200 can be bonded flat to the bonding surface, thereby avoiding wrinkles. In some implementations of the present application, in order to ensure a good effect of bonding the film, the effective aperture of the lens 300 ranges from 1 mm to 60 mm to ensure that the film 200 can be bonded flat to the bonding surface of the lens 300 without generating wrinkles. In some implementations, to ensure that no wrinkles are generated when the film 200 is bonded to the lens 300, if the film bonding surface of the lens 300 is convex, the ratio of the radius of curvature of the film bonding surface to the bonding aperture of the film bonding surface is greater than 1.2; or if the film bonding surface of the lens 300 is concave, the ratio of the radius of curvature of the film bonding surface to the bonding aperture of the film bonding surface is greater than 1.5. Please note that in this implementation of the present application, if the film bonding surface is spherical, the radius of curvature of the film bonding surface is the radius of curvature of the film bonding surface that is a sphere; or if the film bonding surface is aspheric or a free-form surface, the radius of curvature of the film bonding surface is the radius of curvature of the sphere that is closest to the surface shape of the film bonding surface, obtained by fitting to the film bonding surface. The bonding aperture of the film bonding surface is the size of the projection generated through the orthogonal projection of the film onto a plane perpendicular to the optical axis of the lens when the film 200 is bonded to the lens 300.

[0065] 1 again, in some implementations of the present application, the driving mechanism 30 includes a first driving mechanism 31 and a second driving mechanism 32. The first driving mechanism 31 is connected to the first jig 10, and the second driving mechanism 32 is connected to the second jig 20. The first driving mechanism 31 is configured to drive the first jig 10 to move toward the second jig 20, and the second driving mechanism 32 is configured to drive the second jig 20 to move toward the first jig 10, so that the film 200 fixed to the second jig 20 is bonded to the lens 300 fixed to the first jig 10.

[0066] In this implementation example of the present application, each of the first drive mechanism 31 and the second drive mechanism 32 may be a drive mechanism such as a threaded rod drive mechanism, a guide rail drive mechanism, or a cylinder drive mechanism. Specifically, in the implementation example shown in FIG. 1, the first drive structure 31 is a guide rail drive mechanism, which includes a guide rail 311 and a guide rail motor 312 connected to one end of the guide rail 311. The first jig 10 is connected to the guide rail 311 and can move along the guide rail 311 under the driving of the guide rail motor 312. The second drive mechanism 32 is a cylinder drive mechanism. The cylinder drive mechanism includes a cylinder 321 and a connecting rod 322 connected to the cylinder 321. The second jig 20 is connected to an end of the connecting rod 322 away from the cylinder 321. Under the driving of the cylinder 321, the second jig 20 can move in the extension direction of the connecting rod 322. In this mounting example, the extending direction of the connecting rod 322 is the direction in which the second jig 20 faces the first jig 10.

[0067] It will be understood that in another implementation of the present application, each of the first drive mechanism 31 and the second drive mechanism 32 may alternatively be another type of drive mechanism for generating relative movement under the drive of the drive mechanism.

[0068] 2, in some other implementations of the present application, the driving mechanism 30 further includes a third driving structure 33. The third driving mechanism 33 is connected to the clamping member 500 for driving the clamping member 500 to clamp or release the carrier film 400. It can be understood that in this implementation, the clamping member 500 can also be various types of driving mechanisms, such as a screw rod driving mechanism, a guide rail driving mechanism, and a cylinder driving mechanism.

[0069] 1 and 2 again, in some other implementations of the present application, the device 100 for bonding a film to a lens may further include a first cavity 41 and a second cavity 42 used in cooperation with the first cavity 41. In some implementations of the present application, the first fixture 10 is located in the first cavity 41, and the second fixture 20 is located in the second cavity 42. The first cavity 41 and the second cavity 42 are arranged opposite to each other, and the first cavity 41 and the second cavity 42 can move relative to each other until the first cavity 41 and the second cavity 42 are spliced ​​together in a cover manner to form a closed space, so that the first fixture 10 and the second fixture 20 are located in the closed space, and the process of bonding the film 200 to the lens 300 is performed in the closed space, thereby preventing external impurities from entering between the film 200 and the lens 300 and improving the bonding quality. Additionally, in some implementations, the closed space may be connected to a vacuum device, which evacuates the closed space to form a vacuum environment, thereby further avoiding the generation of air bubbles between the film 200 and the lens 300 when the film 200 is bonded to the lens 300, and further improving the quality of the bond between the film 200 and the lens 300.

[0070] In this implementation, the first jig 10 is located in the first cavity 41, and the first driving mechanism 31 is connected to the first cavity 41 to drive the first cavity 41 to move relative to the second cavity 42. In this implementation, through the connection between the first cavity 41 and the first driving mechanism 31, the first jig 10 can move.

[0071] The present application further provides a method for bonding a film to a lens, in order to bond the film 200 to the lens 300. In this implementation example of the present application, the film 200 can be bonded to the film bonding surface of different shapes of different lenses 300 through the device 100 for bonding a film to a lens. Specifically, the present application describes the method for bonding a film 200 to a lens 300 of the present application using an example in which the film 200 is bonded to a lens 300 whose film bonding surface is a convex surface through the device 100 for bonding a film to a lens shown in FIG. 1, and an example in which the film 200 is bonded to a lens 300 whose film bonding surface is a concave surface through the device 100 for bonding a film to a lens shown in FIG. 2. Referring to FIG. 7, FIG. 7 is a schematic flowchart of a method for bonding a film 200 to a lens 300 according to some implementation examples of the present application. In this implementation example of the present application, the bonding method for bonding a film 200 to a lens 300 specifically includes the following:

[0072] Step 110 : The lens 300 is fixed to the first jig 10 .

[0073] In this implementation example of the present application, in order to fix the lens 300, the lens 300 is mounted in a first jig 10. In addition, when the lens 300 is mounted in the first jig 10, the film bonding surface of the lens 300 to which the film 200 needs to be bonded is away from the first jig 10 to facilitate subsequent film bonding.

[0074] In this implementation example of the present application, the film bonding surface of the lens 300 may be a convex surface, a concave surface, or a flat surface. For example, in the implementation example shown in Fig. 1, the film bonding surface of the lens 300 fixed to the first jig 10 is a convex surface. In the implementation example shown in Fig. 2, the film bonding surface of the lens 300 fixed to the first jig 10 is a concave surface.

[0075] Step 120 : The film 200 is fixed to the second jig 20 .

[0076] In this implementation of the present application, the film 200 is fixed to a film support zone 21 of a second jig 20 for fixing the film 200. In some implementations, when the film 200 is fixed to the second jig 20 of the device 100 for bonding films in the implementation shown in FIG. 1, fixing the film 200 to the second jig 20 may be performed by: Specifically, it includes transferring the film 200 to the film supporting zone 21 of the second fixture 20 and enabling the vacuum device, so that the film 200 is fixed to the film supporting zone 21 of the second fixture 20 under the vacuum suction force of the vacuum hole 22.

[0077] 1 , the film carrying zone 21 of the second jig 20 is flat, and the flat film 200 is tiled in the film carrying zone 21 under the vacuum suction force of the vacuum holes 22. It will be understood that in some other implementations of the present application, the film carrying zone 21 may alternatively be concave, and the radius of curvature of the concave surface is larger than the radius of curvature of the film bonding surface of the lens 300.

[0078] 8, Fig. 8 is a flowchart of a specific operation of fixing the film to the second jig 20 when the film 200 is bonded to the lens 300 through the device 100 for bonding films shown in Fig. 2. In some other implementation examples of the present application, when the film 200 is fixed to the second jig 20 of the device 100 for bonding films in the implementation example shown in Fig. 2, fixing the film 200 to the second jig 20 specifically includes:

[0079] Step 121: The film 200 is fixed to the carrier film 400.

[0080] Specifically, the film 200 is fixed to the carrier film 400 by using an adhesive to support the film 200 by using the carrier film 400. The carrier film 400 is made of a flexible material, and the carrier film 400 can be bent and deformed. In some implementations of the present application, the adhesive for fixing the film 200 to the carrier film 400 is an ultraviolet-sensitive optically transparent adhesive. After the film 200 is bonded to the lens 300, the carrier film 400 can be peeled off from the film 200 through exposure to ultraviolet light.

[0081] In this implementation example, by carrying the film 200 through the carrier film 400, the film 200 can be protected from being easily damaged in the subsequent process of being transferred to the film carrying zone 21 of the second fixture 20, and the film 200 can be transferred more easily.

[0082] Step 122: Transfer the film 200 through the carrier film 400 until it faces the film carrying zone 21 of the second fixture 20, and clamp the carrier film 400 on both sides of the film 200 by using clamp members 500 to ensure that the portions of the carrier film 400 carrying the film 200 can be taut.

[0083] In some implementations, the film 200 can be transferred to a position facing the film carrying zone 21 of the second fixture 20 in a wraparound manner through a pulley. In addition, when the film 200 is transferred to a position facing the film carrying zone 21 of the second fixture 20, both sides of the film 200 on the carrier film 400 are clamped by using clamp members 500 to facilitate the subsequent film splicing process, and the clamp members 500 on both sides of the film 200 ensure that the part of the carrier film 400 carrying the film 200 is kept taut, thereby ensuring that the film 200 located on the carrier film 400 is in an unfolded state.

[0084] Step 123 : The film 200 on the carrier film 400 is driven to move relative to the second jig 20 until the carrier film 400 moves and comes into contact with the second jig 20 .

[0085] In the present application, driving the film 200 on the carrier film 400 to move relative to the second jig 20 may mean keeping the second jig 20 stationary and moving the clamp member 500 that clamps the carrier film 400 in order to drive the carrier film 400 and the film 200 located on the carrier film 400 toward the second jig 20 until the carrier film 400 moves and comes into contact with the second jig 20. Alternatively, driving the film 200 on the carrier film 400 to move relative to the second jig 20 may mean keeping the position on the carrier film 400 unchanged and moving the second jig 20 toward the carrier film 400 until the carrier film 400 moves and comes into contact with the second jig 20.

[0086] Step 124: To fix the film 200 to the film supporting position 21 of the second jig 20, a vacuum device connected to the vacuum hole 22 of the second jig 20 is enabled, and through vacuum suction, the portion of the carrier film 400 corresponding to the position on the film 200 is adsorbed and fixed to the film supporting position 21 of the second jig 20.

[0087] In some implementations of the present application, the film carrying zone 21 is a convex surface. When the vacuum device is enabled at the position on the vacuum hole 22 to fix the carrier film 400 and the film 200 on the carrier film 400 to the film carrying position 21 through vacuum suction force, the clamp members 500 on both sides of the film 200 can be further moved toward the second jig 20 to make the positions on the carrier film 400 on both sides of the film 200 taut by using the clamp members 500, ensuring that both ends of the film 200 carried on the carrier film 400 can be firmly bonded by the film carrying position 21, avoiding the problem that both ends of the film 200 are warped due to the vacuum suction force, and ensuring the bonding effect of the film 200.

[0088] It will be appreciated that in the method for bonding a film to a lens of the present application, the sequence of steps 110 through 120 may be randomly altered, i.e., step 110 may be performed before step 120; step 120 may be performed before step 110; or steps 110 and 120 may be performed simultaneously.

[0089] Referring again to FIG. 7, after completing step 120, the method further includes step 130: obtaining full aperture boundary information of the lens 300 and aligning the lens 300 with the first jig 200.

[0090] In some implementations of the present application, the device 100 for bonding a film to a lens further includes a first alignment camera. The first alignment camera has a high resolution, and the shooting range of the first alignment camera can cover the full aperture range of the lens 300, so that the boundary information of the full aperture of the lens 300 can be obtained. In order to accurately obtain the center position on the lens 300, the boundary information of the full aperture of the lens 300 is obtained through the high-resolution alignment camera. The lens 300 is moved to make the center position on the lens 300 face the center position on the lens support zone 11 of the first jig 10, that is, the connecting line between the center position on the lens 300 and the center position on the lens support zone 11 of the first jig 10 is collinear with the optical axis of the lens 200. In this way, the lens 300 is aligned with the first jig 10. Obtaining the boundary information of the full aperture of the lens 300 through the high-resolution first alignment camera specifically includes: moving the first alignment camera until the first alignment camera is directly above the lens 300 and has a lens direction facing the lens 300; photographing the full aperture of the lens 300 through the high-resolution first alignment camera, and obtaining the imaging boundary information of the lens 300 through a processor to obtain the boundary information of the full aperture of the lens 300. The center position information of the lens 300 is obtained by calculating and obtaining the center position on the lens 300 using the boundary information. Specifically, in this implementation, the first alignment camera is a charge coupled device (CCD) camera. In this implementation, in order to accurately obtain the center position on the lens 300, the photographing range of the first alignment camera may cover the full aperture range of the lens 300. Compared with a method in which only some positions on the lens 300 are identified and aligned, in this implementation example of the present application, photographing the full aperture of the lens 300 can ensure the accuracy of alignment between the lens 300 and the first jig 10. In some implementation examples of the present application, the accuracy of alignment between the lens 300 and the first jig 10 may reach 0.05 mm to 0.1 mm.

[0091] Step 140: Obtain full aperture boundary information of the film 200 and align the film 200 with the second fixture 20.

[0092] In some implementations of the present application, the device 100 for bonding a film to a lens further includes a second alignment camera. The second alignment camera has a high resolution, and the shooting range of the second alignment camera can cover the full aperture range of the film 200, so that the boundary information of the full aperture of the film 200 can be obtained. In order to accurately obtain the center position on the film 200, the boundary information of the full aperture of the film 200 is obtained through the high-resolution alignment camera. In order to allow the center of the film 200 to face the center position on the second jig 20, the film 200 is moved, that is, the connecting line between the center of the film 200 and the center of the second jig 20 is perpendicular to the film 200, thereby implementing the alignment between the film 200 and the second jig 20. Obtaining the boundary information of the full aperture of the film 200 through the high-resolution second alignment camera specifically includes: moving the second alignment camera until the second alignment camera is directly above the film 200 and has a lens direction facing the film 200; and then photographing the full aperture of the film 200 through the high-resolution second alignment camera, and obtaining the imaging boundary information of the film 200 through a processor to obtain the boundary information of the full aperture of the film 200. The center position information of the film 200 is obtained through calculating and obtaining the center position on the film 200 by using the boundary information of the full aperture of the film 200. Specifically, in this implementation, the second alignment camera is a charge coupled device (CCD) camera. In this implementation, in order to accurately obtain the center position on the film 200, the photographing range of the second alignment camera can cover the entire range of the film 200, so that the boundary information of the full aperture of the film 200 can be obtained. Compared to a method in which only a few positions on the film 200 are identified and aligned, in this implementation example of the present application, full aperture shooting of the film 200 ensures accuracy of alignment between the film 200 and the second jig 20.In some implementations of the present application, the alignment accuracy between the film 200 and the second fixture 20 may reach 0.05 mm to 0.1 mm.

[0093] It should be noted that in this implementation example of the present application, the alignment between the lens 300 and the first jig 10 may be implemented by using a first alignment camera, and the alignment between the film 200 and the second jig 20 may be implemented by using a second alignment camera, and there is no mutual influence. Therefore, step 130 and step 140 may be performed simultaneously, thereby improving the film splicing efficiency. It is understood that in another implementation example of the present application, the alignment between the lens 300 and the first jig 10 and the alignment between the film 200 and the second jig 20 may be implemented by using the same alignment camera. Specifically, after implementing the alignment between the lens 300 and the first jig 10, the alignment camera moves to a position corresponding to the second jig 20, and then performs the alignment between the film 200 and the second jig 20. In this case, step 130 is completed first, and then step 140 is completed; or step 140 is completed first, and then step 130 is completed.

[0094] Step 150: The first jig 10 and the second jig 20 are controlled to move relative to each other to gradually bond the film 200 from the middle position on the lens 300 to the edge position.

[0095] In this implementation of the present application, the second jig 20 may remain stationary, and the control mechanism 30 controls the first jig 10 to move gradually closer to the second jig 20; or the first jig 10 may remain stationary, and the control mechanism 30 controls the second jig 20 to move gradually closer to the first jig 10, so that the film 200 is gradually bonded from the middle position to the edge position on the lens 300. Alternatively, in some implementations, the control mechanism 30 may control the first jig 10 to move a specific distance, and the second jig 20 to move a specific distance, so that the film 200 is gradually bonded from the middle position to the edge position on the lens 300. Specifically, in the implementation shown in FIG. 1, the first control mechanism 31 of the control mechanism 30 first controls the first cavity 41 to move toward the second cavity 42, so that the first jig 10 moves toward the second jig 20 by some distance. The first control mechanism 31 controls the first cavity 41 to move toward the second cavity 42 until the first cavity 41 and the second cavity 42 are spliced ​​together in a covering manner, and the closed space formed by splicing the first cavity 41 and the second cavity 42 together in a covering manner is evacuated, so that the subsequent process of bonding the film 200 to the lens 300 can be carried out in a vacuum environment to avoid generating air bubbles between the film 200 and the lens 300 when the film 200 is bonded to the lens 300. Then, the second control mechanism 32 of the control mechanism 30 controls the second jig 20 to move toward the first jig 10, so that the film 200 is gradually bonded to the lens 300 from the middle position to the edge position on the lens 300.

[0096] In this implementation example of the present application, since the second jig 20 is a flexible jig, in the process of moving the first jig 10 toward the second jig 20, the middle position on the lens 300 first comes into contact with the film 200. As the first jig 10 moves further toward the second jig 20, the second jig 20 is gradually deformed, so that the lens 300 from the middle position to the edge position gradually comes into contact with the film 200 and is bonded.

[0097] 1 and 2, it should be noted that the first fixture 10 and the second fixture 20 are disposed opposite each other. Therefore, the step 150, which refers to controlling the first fixture 10 and the second fixture 20 to move relative to each other to gradually bond the film 200 from a middle position to an edge position on the lens 300, means: controlling the first fixture 10 and the second fixture 20 to move opposite each other to gradually bond the film 200 from a middle position to an edge position on the lens 300. In some other implementation examples of the present application, when the first fixture 10 and the second fixture 20 in the device 100 for bonding a film to a lens are arranged in parallel, the step 150 of controlling the first fixture 10 and the second fixture 20 to move relative to each other to gradually bond the film 200 from the middle position to the edge position on the lens 300 includes: flipping the first fixture 10 or the second fixture 20 over and positioning the second fixture 20 and the first fixture 10 facing each other; and then controlling the first fixture 10 and the second fixture 20 to move opposite each other to gradually bond the film 200 from the middle position to the edge position on the lens 300.

[0098] In this embodiment of the present application, the flat film 200 is bonded to the lens 300 by gradually contacting the lens 300 from the middle position to the edge position, so that the flat film 200 from the middle position to the edge position can be uniformly deformed, thereby avoiding the case that the optical performance and mechanical performance of the film 200 change after the flat film 200 is bonded to the lens 300, and therefore the optical performance and mechanical performance of the optical element finally obtained through bonding are not affected. For example, in some embodiments of the present application, the film 200 is an optical film having an optical axis, such as a reflective polarizing film, a quarter wave plate, or a half wave plate. According to the method for bonding the film in this embodiment of the present application, the optical axis offset between the center position and the edge position on the film 200 generated after the film 200 is bonded can be less than or equal to ±5°, and the optical performance difference between the center and the edge of the film 200 can be less than or equal to ±10%. In addition, the method for bonding the film 200 of the present application is easy to operate and does not require first heating the flat film 200 to make it into a curved film with an ideal shape through processes such as heating, maintaining pressure, stretching, and softening, and then bonding the curved film 200 to the lens 300, thereby simplifying the bonding method and avoiding the case where the optical or mechanical performance of the bonded film 200 is affected due to processes such as heating, maintaining pressure, stretching, and softening.

[0099] In some implementations of the present application, before "gradually bonding the film from a middle position on the lens to an edge position" in step 150, the method further includes:

[0100] Step 141 : The film 200 is heated by using the second jig 20 .

[0101] In this embodiment of the present application, by heating the film 200, the film 200 can be softened, so that the film 200 can be better bonded to the film-supporting zone 21. In addition, in the process of bonding the film 200 to the lens 300, since the film 200 can be more easily deformed after heating, the film 200 can be bonded flat to the surface of the lens 300, thereby avoiding problems such as wrinkles that occur when the film 200 is bonded to the film bonding surface of the lens 300. In addition, in this embodiment of the present application, in order to ensure that all positions on the film 200 can have the same deformation ability and to avoid wrinkles or changes in the optical axis direction caused by uneven stretching of all positions of the film 200, all positions on the film 200 are heated evenly by using the second jig 20, thereby ensuring the quality of the optical element finally obtained by bonding the film. In addition, the film 200 is heated by using the second jig 20. Because the second fixture 20 has a certain heat maintaining function, the film 200 can be heated during the entire bonding process, ensuring that the film 200 can always be in a heated state during the process of bonding the film 200 to the lens 300, thereby achieving a better bonding effect.

[0102] In this implementation of the present application, the device 100 for bonding a film to a lens includes a film heater 600. The film heater 600 is fixed on the side of the second fixture 20 away from the film 200. During operation, the film heater 600 heats the second fixture 20, so that the heat generated by the film heater 600 is transferred to the second fixture 20, and then the film 200 is heated by using the second fixture 20. In this implementation, since the second fixture 20 has a certain heat maintaining effect, after the film heater 600 stops, the second fixture 20 can still continuously heat the film 200, thereby reducing energy consumption. In some implementations of the present application, the second fixture 20 can generate a heating temperature of 30°C to 150°C to ensure that the second fixture 20 can sufficiently heat the film 300 and ensure that the film 200 can have a good bonding effect with the lens 300.

[0103] In some implementations of the present application, before "gradually bonding the film from a middle position on the lens to an edge position" in step 150, the method further includes:

[0104] Step 142: The lens 300 is heated by using the first jig 10.

[0105] In this implementation of the present application, in order to ensure that the stress between the film 200 and the lens 300 can be small after the film 200 and the lens 300 are bonded and cooled, thereby ensuring the stability of the bond between the film 200 and the lens 300, the lens 300 is heated, so that the temperature difference between the film 200 and the lens 300 can be reduced in the process of bonding the film 200 to the lens 300. In some implementations of the present application, the temperature difference between the lens 300 and the film 200 is less than 30°, so that the stability of the bond between the film 200 and the lens 300 can be effectively guaranteed. In this implementation of the present application, by using the first jig 10, all positions on the lens 300 are heated evenly in the process of bonding the film 200 to the lens 300. In some implementations, the temperature difference between the lens 300 and the film 200 is less than 10°, so that the stability of the bond between the film 200 and the lens 300 can be more effectively guaranteed.

[0106] In some implementations of the present application, the device 100 for bonding a film to a lens includes a lens heater 700. The lens heater 700 is fixed on the side of the first fixture 10 away from the lens 300. During operation, the lens heater 700 heats the first fixture 10, so that the heat generated by the lens heater 700 is transferred to the first fixture 10, and then the lens 300 is heated by using the first fixture 10. In this implementation, since the first fixture 10 can have a certain heat maintaining effect, after the lens heater 700 is stopped, the first fixture 10 can still continuously heat the lens 300, thereby reducing energy consumption. In some implementations of the present application, in order to ensure that the first fixture 10 can be heated sufficiently and reduce the temperature difference between the film 200 and the lens 300 during bonding, the lens heater 700 can generate a heating temperature of 30°C to 150°C.

[0107] In this implementation example of the present application, steps 142 and 143 may be performed at any timing after step 120 and before step 150. This specification is not particularly limited thereto. In the implementation example shown in FIG. 7, steps 142 and 143 are performed after step 140 and before step 150.

[0108] In some implementations of the present application, after the film 200 is bonded to the lens 300 in step 150, heat maintenance and pressure maintenance may be further performed on the lens 300 to which the film 200 is bonded for a certain time to ensure the tightness of the bond between the film 200 and the lens 300. Specifically, in some implementations of the present application, after the film 200 is bonded to the lens 300, the lens 300 to which the film 200 is bonded is subjected to heat maintenance and pressure maintenance at a temperature of 30° C. to 150° C. with a pressure of 1 to 2000 kgf for more than 5 seconds.

[0109] In some implementations of the present application, an adhesive layer and a release film are laminated on the film 200. The adhesive layer can bond the film 200 to the surface of the lens 300. In this implementation of the present application, the adhesive layer can be various types of transparent adhesives, such as optically clear adhesive (OCA) and pressure sensitive adhesive (PSA). In some implementations of the present application, the thickness of the adhesive layer is 5 μm to 50 μm, to ensure that the film 200 can be stably bonded to the lens 300 by using the adhesive layer, and to avoid the case where the thickness and optical performance of the optical element obtained by bonding the lens 300 to the film 200 is affected due to the thickness of the adhesive layer being too large.

[0110] In some implementations, the adhesive layer for bonding the film 200 to the lens 300 and the adhesive for securing the film 200 to the carrier film 400 are made of the same material to ensure that the firmness of the bond between the film 200 and the lens 300 is not affected when the carrier film 400 is subsequently peeled off from the film 200.

[0111] The release film is also called peeling film, isolating film, separating film, or anti-adhesive film. The release film can ensure that the coating film layer has a certain release force to protect the adhesive layer. In this implementation, when the film 200 is bonded to the lens 300, the release film layer needs to be removed to bond the film 200 to the lens 300 by using the adhesive layer. Therefore, in the implementation, before step 150, the method needs to further include the step of: removing the release film from the surface of the film 200.

[0112] In this implementation, when the film 200 is fixed to the first jig 10, the release film is located on the surface of the film 200 that is away from the first jig 10. After the release film is removed, the adhesive layer on the surface of the film 200 faces the lens 300. When the lens 300 is close to the film 200, the film 200 can be bonded to the lens 300.

[0113] In some implementations of the present application, before step 150, the method further includes:

[0114] Step 111: A surface activation process is performed on the surface of the lens 300.

[0115] In this implementation of the present application, the surface activation treatment on the lens 300 can generate polar groups (e.g., hydroxyl oxide film) on the surface of the lens 300 or roughen the surface of the lens 300, so that the film 200 can be more firmly attached to the surface of the lens 300. In some implementations, the surface of the lens 300 is cleaned when the surface activation treatment is performed on the surface of the lens 300 to ensure that there are no impurities between the lens 300 and the film 200 after the film is bonded, and to ensure the film bonding quality.

[0116] In some implementations of the present application, an activation treatment may be performed on the surface of the lens 300 in the form of a plasma treatment, and impurities on the surface of the lens 300 may be removed. It will be appreciated that in some other implementations of the present application, the film bonding surface of the lens 300 may alternatively be cleaned by another cleaning method.

[0117] In this implementation example of the present application, step 111 may be performed at any time before step 150. In the implementation example shown in Fig. 7, step 111 is performed before step 110. Specifically, a surface activation treatment is first performed on the film bonding surface of the lens 300, and then the lens 300 is fixed to the first jig 10. It will be understood that in some other implementation examples of the present application, step 111 may be performed at any time between step 110 and step 150. This specification does not particularly limit this.

[0118] In some implementations of the present application, after step 140 and before step 150, the method further includes:

[0119] Step 141: Obtain full aperture boundary information of the lens 300 and full aperture boundary information of the film 200 to align the lens 300 with the film 200.

[0120] Specifically, in this implementation of the present application, the alignment between each position on the lens 300 and each position on the film 200 may be implemented by using a third alignment camera. In some implementations, when the lens 300 is aligned with the film 200, the third alignment camera may be moved to a position between the lens 300 and the film 200 arranged opposite to each other, and the full aperture boundary information of the lens 300 is obtained by using the third alignment camera to determine the center position on the lens 300. In addition, the full aperture boundary information of the film 200 is obtained to determine the center position on the film 200. Then, the first jig 10 and the second jig 20 are moved relative to each other, so that the center position on the lens 300 faces the center position of the film 200, thereby aligning the lens 300 with the film 200. In this implementation, before the film 200 is bonded to the lens 300, the film 200 is aligned with the lens 300, so that the accuracy of bonding the film 200 to the lens 300 can be further improved.

[0121] It should be noted that to prevent the third alignment camera from interfering with the relative movement between the lens 300 and the film 200 during bonding, the third alignment camera may be moved away from its position between the lens 300 and the film 200 after the third alignment camera has completed alignment between the lens 300 and the film 200.

[0122] It will be appreciated that in some other implementations of the present application, step 141 may alternatively not be performed and the film 200 and lens 300 are aligned through a precise structural fit between the first fixture 10 and the second fixture 20.

[0123] In some implementations of the present application, after completing step 150, the method may further include:

[0124] Step 151 : The lens 300 is removed from the first jig 10 , and the film 200 is removed from the second jig 20 .

[0125] Specifically, in the case of the device 100 for bonding a film to a lens in the implementation example shown in Fig. 1, removing the film 200 from the second jig 20 includes: disabling the vacuum device to remove the film 200 from the second jig 20, so that the second jig 20 does not generate a vacuum suction force on the film 200. In the case of the device 100 for bonding a film to a lens in the implementation example shown in Fig. 2, removing the film 200 from the second jig 20 includes: disabling the vacuum device to remove the film 200 from the second jig 20, so that the second jig 20 does not generate a vacuum suction force on the film 200; and loosening the carrier film 400 from the clamping member 500.

[0126] Step 152: A degassing process is performed on the lens 300 to which the film 200 is bonded.

[0127] Specifically, in some implementations of the present application, the film bonding jig 100 further includes a degassing jig. In order to facilitate the discharge of air bubbles between the film 200 and the lens 300 and ensure the optical quality of the optical element, the lens 300 to which the film 200 is bonded, which is taken out from the first jig 10 and the second jig 20, is placed in the degassing jig, and pressure and heat maintenance processes are performed on the lens 300 to which the film 200 is bonded. In this implementation, when the pressure and heat maintenance processes are performed on the film 200 to ensure that air bubbles between the film 200 and the lens 300 can be discharged, the pressure is 0.1 MPa to 1 MPa, the temperature is 40°C to 80°C, the heat maintenance and pressure maintenance time is 5 minutes to 1 hour, and the temperature, pressure, heat maintenance and pressure maintenance time can be controlled to avoid the influence of the degassing process on the optical performance of the optical element.

[0128] Specifically, in some implementation examples of the present application, the film splicing jig 100 further includes a transfer mechanism such as a robot arm or a belt pulley, etc. The lens 300 to which the film 200 is spliced ​​is taken out of the first jig 10 and the second jig 20 by using a transfer mechanism such as a robot arm or a belt pulley, and placed in the degassing jig for degassing treatment.

[0129] In the case of the device 100 for bonding a film to a lens shown in FIG. 2, after the degassing process is performed on the lens, the method further includes: peeling the carrier film 400 from the film 200. In some implementations, peeling the carrier film 400 from the film 200 includes: performing exposure to ultraviolet rays (UV) at the position where the film 200 is bonded to the carrier film 400, so that the adhesive layer bonding the film 200 to the carrier film 400 is cured and inactivated, and the film 200 is peeled off from the carrier film 400. It should be noted that the adhesive layer between the film 200 and the lens 300 is a non-UV-sensitive adhesive layer, in order to avoid the case where the exposure to ultraviolet rays affects the tightness of the bond between the film 200 and the lens 300 when the carrier film 400 is peeled off from the film 200 through ultraviolet rays. Referring to FIG. 9, FIG. 9 is a schematic diagram of an operation module of the device 100 for bonding a film to a lens according to an implementation of the present application. In some implementations of the present application, the device for splicing a film to a lens 100 further comprises a memory 101, a processor 102, and a program for splicing a film to a lens. The program for splicing a film to a lens is stored in the memory 101 and is operable on the processor 102. The program for splicing a film to a lens is executed by the processor 102 to control the device for splicing a lens 100 to perform the method for splicing a film to a lens described above.

[0130] The above description is an exemplary implementation of the present application. It should be noted that a person skilled in the art may make some improvements and modifications without departing from the principle of the present application, and the improvements and modifications also fall within the protection scope of the present application.

Claims

1. 1. A method for bonding a film to a lens, comprising the steps of: mounting the lens in a lens mounting zone of a first fixture; supporting the film in a film support zone of a second fixture, wherein the second fixture is a deformable fixture; obtaining overall size information of the lens and aligning a center position of the lens with a center position of the lens mounting zone of the first fixture; obtaining overall size information of the film and aligning a center position of the film with a center position of the film carrying zone of the second fixture; and controlling the first and second jigs to move relative to each other to gradually bond the film from a central zone to an edge zone to the lens; 16. A method for bonding a film to a lens comprising:

2. Prior to the step of gradually bonding the film from a central zone to an edge zone to the lens, the method further comprises: Heating the film by using the second fixture.

10. The method for bonding the film of claim 1 to a lens, further comprising:

3. Prior to the step of gradually bonding the film from a central zone to an edge zone to the lens, the method further comprises: heating the lens by using the first fixture to reduce a temperature difference between the lens and the film to less than 30° C. before the lens and the film are bonded together; 3. The method for bonding the film of claim 2 to a lens, further comprising:

4. The overall size information of the lens is obtained by using a first alignment camera, the imaging range of the first alignment camera covers the overall size of the lens; and The size information of the entire film is obtained by using a second alignment camera, and the imaging range of the second alignment camera covers the entire size of the film. A method for bonding a film according to any one of claims 1 to 3 to a lens.

5. After the step of controlling the first jig and the second jig to move relative to each other to gradually bond the film from a central zone to an edge zone to the lens, removing the lens from the first jig and removing the film from the second jig; and performing a degassing process on the lens to which the film is bonded; 5. A method for bonding the film of claim 1 to a lens, further comprising:

6. The defoaming treatment is placing the lens to which the film is bonded in a degassing tool, and performing a pressure maintenance and a heat maintenance process on the lens to which the film is bonded, wherein during the pressure maintenance and heat maintenance processes, the pressure is 0.1 MPa to 1 MPa, the temperature is 40° C. to 80° C., and the heat maintenance and pressure maintenance time is 5 minutes to 1 hour.

6. A method for bonding the film of claim 5 to a lens, comprising:

7. 7. A method for bonding a film to a lens as described in any one of claims 1 to 6, wherein the size of the film is the same as the size of the part of the lens that performs the optical function, or the size of the film is smaller than the size of the part of the lens that performs the optical function.

8. The surface of the lens to which the film is bonded is a film bonding surface; and When the film bonding surface of the lens is concave, the film carrying zone of the second jig is convex and the radius of curvature of the film carrying zone is smaller than the radius of curvature of the film bonding surface; or when the film bonding surface of the lens is convex, the film carrying zone of the second jig is flat or concave and the radius of curvature of the film carrying zone is larger than the radius of curvature of the film bonding surface. A method for bonding a film according to any one of claims 1 to 7 to a lens.

9. The film support zone has an array of vacuum holes, and the film is supported on the film support zone by using the vacuum suction force of the vacuum holes.

9. A method for bonding the film of claim 8 to a lens.

10. 8. The method for bonding a film to a lens of claim 7, wherein the size of the portion of the lens that performs the optical function ranges from 1 mm to 60 mm, and when the film bonding surface of the lens is convex, the ratio of the radius of curvature of the film bonding surface to the bonding aperture of the film bonding surface is greater than 1.2; or when the film bonding surface of the lens is concave, the ratio of the radius of curvature of the film bonding surface to the bonding aperture of the film bonding surface is greater than 1.

5.

11. 11. The method for bonding a film to a lens according to any one of claims 1 to 10, wherein the surface of the lens to which the film is bonded is a film bonding surface, and the surface shape of the film bonding surface is spherical, aspheric, concave, convex or a free-form surface with flat edges and concave or convex intermediate zones.

12. The step of supporting the film in a film support zone of a second jig includes: supporting the film on a carrier film; clamping the carrier film on both sides of the film by using clamping members and placing the film against the second fixture, where an orthogonal projection of the second fixture on a plane in which the film is located covers the film; and controlling the carrier film and the second fixture to move relative to each other until the film on the carrier film is bonded to the second fixture; 12. A method for bonding the film of any one of claims 1 to 11 to a lens, comprising:

13. Prior to the step of controlling the first fixture and the second fixture to move relative to each other, obtaining the overall size information of the lens and the overall size information of the film and aligning the lens with the film; 13. A method for bonding the film of any one of claims 1 to 12 to a lens, further comprising:

14. Prior to the step of controlling the first fixture and the second fixture to move relative to each other, performing a surface activation treatment on the surface of the lens; 14. A method for bonding the film of any one of claims 1 to 13 to a lens, further comprising:

15. 15. A device for bonding a film to a lens, comprising a memory, a processor, and a program for bonding the film to the lens, the program being stored in the memory and operable on the processor, the program being executed by the processor to implement a method according to any one of claims 1 to 14.

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