Patent Description:
In the field of optical imaging, a film often needs to be bonded to an optical lens, to improve an imaging effect of the optical lens. To achieve a flat film bonding effect, currently, a main manner of bonding a film to a lens is: bonding a planar film to a surface of a thin-sheet substrate, hot-bending an entirety formed by the film and the substrate, and placing a hot-bent thin sheet in an injection molding jig. After an optical material is injection-molded, an optical element having an optical characteristic consistent with that of the film may be obtained. However, after the film is hot-bent, due to a characteristic of the film, the film is very likely to extend and cannot maintain an initial pre-bending shape. As a result, surface precision of the finally obtained optical element is affected. In addition, because a temperature of the injection-molded optical material is generally high, optical performance or mechanical performance of the film is likely affected. The document <CIT> shows an apparatus for confirming a planar film on an optical lens, a method for functionalizing an optical lens by means of said apparatus, and the according optical lens. The document <CIT> shows a system and method for applying a film on a lens.

This application provides a method for bonding a film to a lens, to obtain an optical element with high surface shape precision, ensure optical performance and mechanical performance of the film, and ensure that the optical element finally obtained through bonding can have good quality.

According to a first aspect, this application provides a method for bonding a film to a lens. The method for bonding a film includes:.

In this application, by using the method for bonding a film, the planar film can gradually come into contact with and be bonded to the lens from the middle position to the edge position, so that the planar film from the middle position to the edge position can be evenly deformed, thereby avoiding a case that after the planar film is bonded to the lens, optical performance, mechanical performance, and the like of the film are changed, and consequently, optical performance and mechanical performance of an optical element finally obtained through bonding are affected. In addition, the method for bonding a film in this application is easy to operate, and does not need to first heat the planar film into a curved film with an ideal shape through processes such as heating, pressure preservation, stretching, and softening, and then bond the curved film to the lens, thereby avoiding a case that optical performance or mechanical performance of the bonded film is affected due to the processes such as heating, pressure preservation, stretching, and softening while simplifying the bonding method.

In addition, the middle position to the edge position on the lens are gradually bonded to the film, so that a bubble between the film and the lens can be easily discharged, thereby ensuring quality of bonding between the film and the lens.

In addition, in this application, the boundary information of the full aperture of the lens is obtained, to align the lens with the first jig; and
the boundary information of the full aperture of the film is obtained, to align the film with the second jig. Compared with a manner in which only some positions on the film and the lens are identified and aligned, in this implementation of this 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 accuracy of alignment between the film and the second jig and accuracy of alignment between the lens and the first jig.

In some implementations of this application, before the gradually bonding a middle position to an edge position on the lens to the film, the method further includes the following step:
heating the film by using the second jig.

In this implementation of this application, the film can be softened by heating the film, so that the film can be better bonded to a film carrying zone. In addition, in a process of bonding the film to the lens, because the film can be more easily deformed after being heated, the film can be bonded to a surface of the lens flatly, thereby avoiding a problem such as a wrinkle that occurs when the film is bonded to the film bonding surface of the lens. In addition, in this implementation of this application, all positions on the film can be evenly heated by using the second jig, to ensure that the positions on the film can have a same deformation capability, and avoid a wrinkle or a change in an optical axis direction caused by uneven stretching of the positions on the film, thereby ensuring quality of an optical element finally obtained by bonding the film. In addition, the film is heated by using the second jig. Because the second jig has a specific heat preservation function, the film can be heated in an entire bonding process, to ensure 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 jig has a specific heat preservation effect, after a film heater is stalled out, the second jig can still continuously heat the film, thereby reducing energy consumption.

In some implementations, before the gradually bonding a middle position to an edge position on the lens to the film, the method further includes the following step:
heating the lens by using the first jig, to enable a temperature difference between the lens and the film to be less than <NUM>°before the lens and the film are bonded.

In this implementation of this application, the lens is heated, so that a temperature difference between the film and the lens can be reduced in the process of bonding the film to the lens, to ensure that a stress between the film and the lens can be small after the film and the lens are bonded and cooled, thereby ensuring stability of the bonding between the film and the lens. In some implementations, a temperature difference between the lens and the film is less than <NUM>°, so that stability of the bonding between the film and the lens can be effectively ensured. In this implementation of this application, all positions on the lens are evenly heated by using the first jig, to ensure a temperature balance between the positions on the lens in the process of bonding the film to the lens.

In some implementations, the boundary information of the full aperture of the lens is obtained by using a first alignment camera, where a photographing range of the first alignment camera covers 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, where a photographing range of the second alignment camera covers the full aperture of the film.

Because the photographing 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 a central position on the lens can be obtained more accurately, to ensure accuracy of alignment between the lens and the first jig. Because the photographing 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 a central position on the film can be obtained more accurately, to ensure accuracy of alignment between the film and the second jig.

In some implementations, the method for bonding a film to a lens further includes:.

In this implementation, by performing debubbling processing on the lens to which the film is bonded, the bubble between the film and the lens can be further removed, thereby further improving an effect of bonding the film to the lens.

In some implementations, the debubbling processing includes:
placing the lens to which the film is bonded in a debubbling jig, and performing pressure preservation and heat preservation processing on the lens to which the film is bonded, where during the pressure preservation and heat preservation processing, a pressure is <NUM> MPa to <NUM> MPa, a temperature is <NUM> to <NUM>, and a heat preservation and pressure preservation time is <NUM> to <NUM>. In this implementation, the bubble between the lens and the film can be fully removed through adequate pressure preservation and heat preservation processing, to ensure an effect of bonding between the lens and the film.

In some implementations, a size of the film is the same as an effective aperture of the lens, or a size of the film is less than an effective aperture of the lens, to avoid a case that a surplus of the film needs to be cut off through another process (for example, laser cutting) after the film is bonded, thereby reducing manufacturing processes. In addition, it can be further ensured that a wrinkle does not easily occur when the film is bonded to the lens.

In some implementations, the second jig includes a film carrying zone, the film is fastened to the film carrying zone, and a surface that is of the lens and to which the film is bonded is a film bonding surface; and
when the film bonding surface of the lens is a concave surface, the film carrying zone of the second jig is a convex surface, and a curvature radius of the film carrying zone is less than a curvature radius of the film bonding surface; or when the film bonding surface of the lens is a convex surface, the film carrying zone of the second jig is a plane or a concave surface, and a curvature radius of the film carrying zone is greater than a curvature radius of the film bonding surface.

In this implementation, for a shape of a different film bonding surface of the lens, correspondingly, the second jig has a film carrying zone in a corresponding shape, to ensure that regardless of whether the film bonding surface of the lens is a concave surface or a convex surface, the film can be gradually to the lens from the middle position to the edge position, thereby ensuring film bonding quality of the lens.

In some implementations, the film carrying zone is provided with vacuum holes in an array, and the film is fastened to the film carrying zone by using vacuum adsorption force of the vacuum holes.

In some implementations, an effective aperture of the lens ranges from <NUM> to <NUM>, to ensure that the film can be flatly bonded to a bonding surface of the lens without generating a wrinkle, to ensure a good effect of bonding the film.

In some implementations, when a film bonding surface of the lens is a convex surface, a ratio of a curvature radius of the film bonding surface to a bonding aperture of the film bonding surface is greater than <NUM>; or when a film bonding surface of the lens is a concave surface, a ratio of a curvature radius of the film bonding surface to a bonding aperture of the film bonding surface is greater than <NUM>, to ensure that no wrinkle is generated when the film is bonded to the lens.

In some implementations, a surface that is of the lens and to which the film is bonded is a film bonding surface, and a surface shape of the film bonding surface is a spherical surface, an aspheric surface, or a free recurved surface.

In some implementations, the fastening the film to a second jig includes:.

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

In some implementations, before the controlling the first jig and the second jig to move relative to each other, the method further includes:
obtaining the boundary information of the full aperture of the lens and the boundary information of the full aperture of the film, to align the lens with the film, to further improve precision of bonding the film to the lens.

In some implementations, before the controlling the first jig and the second jig to move relative to each other, the method further includes:
performing surface activation processing on a surface of the lens.

In this implementation of this application, the surface activation processing is performed on the lens, so that the film can be more firmly attached to a surface of the lens, and the surface of the lens can be cleaned, to ensure that no impurity exists between the lens and the film after the film is bonded, and ensure film bonding quality.

According to a second aspect, this application further provides a device for bonding a film to a lens. The device for bonding a film to a lens includes: a memory, a processor, and a program for bonding a film to a lens, where the program for bonding a film to a lens is stored in the memory and is runnable on the processor, and the program for bonding a film to a lens is executed by the processor to implement the foregoing method for bonding a film to a lens.

The device for bonding a film to a lens provided in this application can perform the foregoing method for bonding a film to a lens. Therefore, through the device for bonding a film to a lens in this application, the planar film can gradually come into contact with and be bonded to the lens from the middle position to the edge position, so that the planar film from the middle position to the edge position can be evenly deformed, thereby avoiding a case that after the planar film is bonded to the lens, optical performance, mechanical performance, and the like of the film are changed, and consequently, optical performance and mechanical performance of an optical element finally obtained through bonding are affected. The method for bonding a film performed through the device for bonding a film to a lens in this application is easy to operate, and does not need to first heat the planar film into a curved film with an ideal shape through processes such as heating, pressure preservation, stretching, and softening, and then bond the curved film to the lens, thereby avoiding a case that optical performance or mechanical performance of the bonded film is affected due to the processes such as heating, pressure preservation, stretching, and softening while simplifying the bonding method.

In addition, through the device for bonding a film to a lens in this application, a bubble between the film and the lens can be easily discharged, thereby ensuring quality of bonding between the film and the lens. In a 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, to ensure accuracy of alignment between the film and the second jig and accuracy of alignment between the lens and the first jig.

To describe the structural attitudes and functions of this application more clearly, the following describes this application in detail with reference to the accompanying drawings and specific embodiments.

The following describes the technical solutions in embodiments of this application with reference to the accompanying drawings in embodiments of this application.

This application provides a method for bonding a film to a lens, to bond a film to a lens. According to the method for bonding a film to a lens in this application, a disadvantage such as a bubble or a wrinkle between the film and a curved cover plate can be avoided, and surface shape precision, optical performance, and mechanical performance of an optical element obtained by bonding the film to the lens can be ensured.

In this 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 this application, the terminal may be augmented reality (Augmented Reality, AR) glasses, virtual reality (Virtual Reality, VR) glasses, a mobile phone, a tablet, a camera, or the like.

In this application, the film may also be any type of film. For example, the film may be an optical film having an optical axis, such as a reflective polarization film, a quarter-wave plate, or a half-wave plate, or may be various types of optical films, such as an anti-reflective film, an anti-scratch film, a light scattering film, and an anti-fog film. In this application, by bonding different types of films to the lens, optical performance or mechanical performance of an optical element obtained by bonding the film to the lens can be correspondingly improved. In some implementations of this application, a thickness of the film is <NUM> to <NUM>, so that optical performance or mechanical performance of an optical element obtained by bonding the film to the lens can be improved, and a case that a thickness and optical performance of the optical element such as a transmittance of light are affected by an excessively large thickness of the film can be avoided.

In this application, the film is bonded to the lens through a device for bonding a film to a lens. Referring to <FIG> is a schematic diagram of a structure of a device <NUM> for bonding a film to a lens according to an implementation of this application. In this implementation, a film <NUM> is bonded to a lens <NUM> through the device <NUM> for bonding a film to a lens. Specifically, in this implementation, the device <NUM> for bonding a film to a lens includes a first jig <NUM>, a second jig <NUM>, and a driving mechanism <NUM>. The first jig <NUM> can be configured to fasten the lens <NUM>, the second jig <NUM> can be configured to fasten the film <NUM>, and the driving mechanism <NUM> can be configured to drive the first jig <NUM> and the second jig <NUM> to move relative to each other, to cause the lens <NUM> fastened to the first jig <NUM> and the film <NUM> fastened to the second jig <NUM> to move relative to each other, to bond the film <NUM> to the lens <NUM>.

Specifically, in this implementation of this application, the first jig <NUM> is a rigid jig, and can stably fasten the lens <NUM>. Specifically, in some implementations of this application, the first jig <NUM> may be made of a material such as plastic (such as heat-resistant nylon plastic), metal (such as aluminum or iron), an alloy (such as an aluminum alloy), or ceramic that has specific strength and is not easy to deform.

In some implementations, the first jig <NUM> is a rigid jig, and the lens <NUM> is clamped and fastened to the first jig <NUM>. It may be understood that, in another implementation of this application, the first jig <NUM> may alternatively be another fastening structure. For example, in some implementations, a vacuum adsorption zone may be disposed in a lens mounting zone <NUM> of the first jig <NUM>, and the lens <NUM> can be fastened to the first jig <NUM> through vacuum adsorption. Alternatively, in some implementations, the first jig <NUM> includes a snap-fit portion, and the lens <NUM> is in tight snap-fit with and fastened to the first jig <NUM> by using the snap-fit portion.

The second jig <NUM> is a deformable flexible jig, to make it convenient to subsequently bond the film <NUM> to the lens <NUM>. Specifically, in this implementation, a manufacturing material of the second jig <NUM> may be a flexible material such as rubber or silicone.

In this implementation of this application, the first jig <NUM> has the lens mounting zone <NUM>, and the lens <NUM> is mounted in the lens mounting zone <NUM>. The second jig <NUM> includes a film carrying zone <NUM>, and the film <NUM> is fastened in the film carrying zone <NUM>. In this implementation, the film carrying zone <NUM> and the lens mounting zone <NUM> are disposed opposite to each other, so that the film <NUM> fastened in the film carrying zone <NUM> can be accurately bonded to the lens <NUM>.

In some implementations, a size of the lens mounting zone <NUM> may be correspondingly adjusted according to a size of a lens <NUM> to be mounted, to fasten lenses <NUM> of different sizes.

In some implementations of this application, a surface of the lens mounting zone <NUM> of the first jig <NUM> may be further covered with a protective layer such as Teflon. When fastened to the first jig <NUM>, the lens <NUM> comes into contact with the protective layer, to avoid causing damage to the lens <NUM> when the first jig <NUM> fastens the lens <NUM>. In addition, in some implementations of this application, a shape of a surface that is of the protective layer and that is away from the first jig <NUM> is substantially the same as a shape of a surface that is of the lens <NUM> and that faces the first jig <NUM>. To be specific, when the lens <NUM> is fastened to the first jig <NUM>, the surface of the lens <NUM> can be substantially bonded to the protective layer, to ensure that the first jig <NUM> can properly support and limit the lens <NUM>, and further ensure that the lens <NUM> can be stably fastened to the first jig <NUM>.

In some implementations of this application, vacuum holes <NUM> disposed in an array are disposed in the film carrying zone <NUM>. The vacuum holes <NUM> can be connected to a vacuumization device, to generate vacuum adsorption force, to adsorb and fasten the film <NUM> to the film carrying zone <NUM>. It may be understood that, in some other implementations of this application, the film <NUM> may alternatively be fastened to the film carrying zone <NUM> in some other manners. For example, referring to <FIG> is a schematic diagram of a structure of a device <NUM> for bonding a film to a lens according to another implementation of this application. In the implementation shown in <FIG>, a film <NUM> is fastened to a carrier film <NUM>, and the device <NUM> for bonding a film to a lens further includes a clamping member <NUM>. The clamping member <NUM> clamps the carrier film <NUM> on two sides of the film <NUM>, to tighten the carrier film <NUM> carrying the film <NUM>. The clamping member <NUM> can move relative to a second jig <NUM> until the carrier film <NUM> comes into contact with a film carrying zone <NUM> of the second jig <NUM>, and a part of the carrier film <NUM> carrying the film <NUM> is tightened and bonded to the film carrying zone <NUM>, to fasten the film <NUM> to the film carrying zone <NUM>. In some implementations, a film carrying zone <NUM> is provided with vacuum holes <NUM> in an array, the device <NUM> for bonding a film to a lens also includes a clamping member <NUM>, and a film <NUM> is fastened to a carrier film <NUM>. A position on the carrier film <NUM> corresponding to the film carrying zone <NUM> is fastened to the film carrying zone <NUM> through joint action of adsorption force of the vacuum holes <NUM> and tightening force of the carrier film <NUM> driven by the clamping member <NUM>, so that the film <NUM> carried on the carrier film <NUM> is fastened to the film carrying zone <NUM>. In this implementation, due to joint action of the adsorption force of the vacuum holes <NUM> and a clamping function of the clamping member <NUM>, the position on the carrier film <NUM> corresponding to the film carrying zone <NUM> can be more firmly and stably bonded to the film carrying zone <NUM>, so that the film <NUM> can be more firmly and stably bonded to the film carrying zone <NUM>.

It should be noted that, in some implementations of this application, the film <NUM> is fastened to the carrier film <NUM>. After the film <NUM> is bonded to a lens <NUM>, the carrier film <NUM> can be easily peeled from the film <NUM>. For example, in some implementations, the film <NUM> is fastened to the carrier film <NUM> through a photosensitive adhesive. After the film <NUM> is bonded to the lens <NUM>, the film <NUM> can be easily peeled from the carrier film <NUM> through ultraviolet exposure, to obtain a required photonic component.

In this implementation of this application, the first jig <NUM> and the second jig <NUM> are disposed opposite to each other, so that the lens <NUM> fastened to the first jig <NUM> is opposite to the film <NUM> fastened to the second jig <NUM>. The film <NUM> can be bonded to the lens <NUM> by moving the first jig <NUM> and the second jig <NUM> relative to each other. In this implementation, the first jig <NUM> is located above the second jig <NUM>, and the first jig <NUM> can move toward the second jig <NUM>. It may be understood that, in another implementation of this application, the second jig <NUM> may alternatively be located above the first jig <NUM>, and the second jig <NUM> may alternatively move toward the first jig <NUM>.

It may be understood that, in some other implementations of this application, the first jig <NUM> and the second jig <NUM> may alternatively be disposed in another position relationship. For example, in some implementations, the first jig <NUM> and the second jig <NUM> may alternatively be disposed in parallel. In a subsequent process of bonding the film <NUM> to the lens <NUM>, the second jig <NUM> may be overturned, so that the second jig <NUM> is disposed opposite to the first jig <NUM>.

In this implementation of this application, a shape of the film carrying zone <NUM> of the second jig <NUM> matches a shape of a film bonding surface of the lens <NUM>, to ensure that a good bonding effect can be achieved when the film <NUM> carried on the film carrying zone <NUM> is bonded to the lens <NUM>.

Specifically, the lens <NUM> includes a light incident surface <NUM> and a light emergent surface <NUM> that are disposed opposite to each other. Light is incident into the lens <NUM> through the light incident surface <NUM>, and is emergent through the light emergent surface <NUM>. In this implementation of this application, the lens <NUM> includes a film bonding surface, and the film <NUM> is bonded to the film bonding surface. In some implementations, the film bonding surface of the lens <NUM> may be the light incident surface <NUM> or the light emergent surface <NUM>. To be specific, the film <NUM> is bonded to the light incident surface <NUM> or the light emergent surface <NUM>. In this case, there is only one film bonding surface of the lens <NUM>. In some other implementations, both the light incident surface <NUM> and the light emergent surface <NUM> of the lens <NUM> may be film bonding surfaces. In other words, a film may be bonded to each of the light incident surface <NUM> and the light emergent surface <NUM> of the lens <NUM>. In this case, there are two film bonding surfaces of the lens <NUM>. In this application, when the lens <NUM> is fastened to the first jig <NUM>, a film bonding surface of the lens <NUM> on which film bonding needs to be performed is away from the first jig <NUM>, to make it convenient for the film <NUM> to be bonded to the film bonding surface of the lens <NUM>.

In this application, the film bonding surface of the lens <NUM> may be a spherical surface, an aspheric surface, or a free recurved surface. The free recurved surface indicates that there is only one vertex on each of two sides of the film bonding surface. For example, the free recurved surface may be a concave surface or a convex surface, or may be a free curved surface whose edge is a plane and whose middle zone is a concave surface or a convex surface.

In some implementations, the film bonding surface of the lens <NUM> is a convex surface, and the film carrying zone <NUM> of the second jig <NUM> may be a plane or a concave surface. When the film carrying zone <NUM> of the second jig <NUM> is a concave surface, a curvature radius of the film carrying zone <NUM> is greater than a curvature radius of the film bonding surface of the lens <NUM>. Referring to <FIG> and <FIG>, <FIG> is a schematic diagram of bonding a lens <NUM> and a film <NUM> when a film bonding surface of the lens <NUM> is a convex surface and a film carrying zone <NUM> of a second jig <NUM> is a plane; and <FIG> is a schematic diagram of bonding a lens <NUM> and a film <NUM> when a film bonding surface of the lens <NUM> is a convex surface and a film carrying zone <NUM> of a second jig <NUM> is a concave surface. When the film bonding surface of the lens <NUM> is a convex surface, the film carrying zone <NUM> of the second jig <NUM> is a plane or a concave surface, and a curvature radius of the film carrying zone <NUM> is greater than a curvature radius of the film bonding surface of the lens <NUM>, it can be ensured that when the first jig <NUM> and the second jig <NUM> are close to each other, to bond the lens <NUM> fastened to the first jig <NUM> to the film <NUM> fastened to the second jig <NUM>, a central zone to an edge zone of the film <NUM> can be gradually bonded to the lens <NUM>, so that air between the film <NUM> and the lens <NUM> can be better removed, to avoid generating a bubble in a process of bonding the film <NUM> to the lens <NUM>.

In some implementations, when the film bonding surface of the lens <NUM> is a concave surface, the film carrying zone <NUM> of the second jig <NUM> is a convex surface, and a curvature radius of the film carrying zone <NUM> is less than a curvature radius of the film bonding surface of the lens <NUM>. In some implementations, a curvature radius of a central position on the film carrying zone <NUM> may be less than <NUM> times a curvature radius of the film bonding surface being a concave surface, to reduce a risk of generating a central bubble when the film <NUM> is bonded to the lens <NUM>. Referring to <FIG> is a schematic diagram of bonding a lens <NUM> and a film <NUM> when a film bonding surface of the lens <NUM> is a concave surface and a film carrying zone <NUM> of a second jig <NUM> is a convex surface. When the film bonding surface of the lens <NUM> is a concave surface, the film carrying zone <NUM> of the second jig <NUM> is a convex surface, and a curvature radius of the film carrying zone <NUM> is less than a curvature radius of the film bonding surface of the lens <NUM>, it can be ensured that when the first jig <NUM> and the second jig <NUM> are close to each other, to bond the lens <NUM> fastened to the first jig <NUM> to the film <NUM> fastened to the second jig <NUM>, a central zone to an edge zone of the film <NUM> are gradually bonded to the lens <NUM>, so that air between the film <NUM> and the lens <NUM> can be better removed, to avoid generating a bubble in a process of bonding the film <NUM> to the lens <NUM>.

It may be understood that, in some implementations of this application, the bonding surface of the lens <NUM> may alternatively be a plane. In this case, the film carrying zone <NUM> of the second jig <NUM> may be a convex surface. Referring to <FIG> is a schematic diagram of bonding a lens <NUM> and a film <NUM> when a film bonding surface of the lens <NUM> is a plane and a film carrying zone <NUM> of a second jig <NUM> is a convex surface. When the bonding surface of the lens <NUM> is a plane, and the film carrying zone <NUM> of the second jig <NUM> is a convex surface, the film <NUM> carried on the film carrying zone <NUM> can preferentially come into contact with a central zone of the lens <NUM>. In a process in which the first jig <NUM> and the second jig <NUM> further approach each other, a central zone to an edge zone of the film <NUM> are gradually bonded to the lens <NUM>, so that air between the film <NUM> and the lens <NUM> can be better removed, to avoid generating a bubble in a process of bonding the film <NUM> to the lens <NUM>.

In this implementation of this application, the film <NUM> is a planar film. In some implementations, a size of the film <NUM> is the same as an effective aperture of the lens <NUM> or slightly less than an effective aperture of the lens <NUM>, to avoid a case that a surplus of the film <NUM> needs to be cut off through another process (for example, laser cutting) after the film <NUM> is bonded, thereby reducing manufacturing processes. In addition, it can be further ensured that a wrinkle does not easily occur when the film <NUM> is bonded to the lens <NUM>. For example, in some implementations of this application, when the lens <NUM> is a plane at an edge and is a concave surface or a curved surface at a middle position, and a diameter of the film <NUM> is less than an effective aperture of the lens <NUM>, the film <NUM> covers only the middle position on the lens <NUM>, but does not cover the edge of the lens <NUM>, thereby ensuring that a required optical effect can be achieved, and avoiding a problem that a bubble is generated because curvatures from the middle position to the edge position covered by the film <NUM> change rapidly. It should be noted that in this implementation of this application, the effective aperture of the lens <NUM> is an aperture of a partial lens, of the lens, that can perform an actual optical function. For example, when the lens <NUM> is a plane at an edge and is a concave surface or a curved surface at a middle position, an edge plane part of the lens is generally a carrying structure, to facilitate mounting of the lens, and does not actually affect transmission in an optical path, and a middle concave surface or convex surface part of the lens <NUM> actually affects the optical path. Therefore, an effective aperture of the lens <NUM> is an aperture of the middle concave surface or convex surface part of the lens <NUM>. In addition, it should be noted that the lens <NUM> in this application may be a circular lens, or may be a lens in another shape such as a square lens. This is not specifically limited herein. A shape of the film <NUM> is the same as a shape of the lens <NUM>. In addition, that a size of the film <NUM> is the same as an effective aperture of the lens <NUM> or slightly less than an effective aperture of the lens <NUM> is specifically that a size of the film in each direction is the same as or slightly less than a size of the lens <NUM> in each corresponding direction. For example, in some implementations of this application, both the lens <NUM> and the film <NUM> are circular. That a size of the film <NUM> is the same as an effective aperture of the lens <NUM> or slightly less than an effective aperture of the lens <NUM> is that a diameter of the film <NUM> is less than or equal to the effective aperture of the lens <NUM>.

In some implementations of this application, an effective aperture of the lens <NUM> ranges from <NUM> to <NUM>. In this implementation of this application, because the film <NUM> is a planar film, the planar film is bonded to the bonding surface of the lens <NUM>. When the bonding surface of the lens <NUM> is a curved surface, the film <NUM> is deformed to some extent, to ensure that each position on the film <NUM> can be flatly bonded to the bonding surface, thereby avoiding a wrinkle. In some implementations of this application, an effective aperture of the lens <NUM> ranges from <NUM> to <NUM>, to ensure that the film <NUM> can be flatly bonded to a bonding surface of the lens <NUM> without generating a wrinkle, to ensure a good effect of bonding the film. In some implementations, when a film bonding surface of the lens <NUM> is a convex surface, a ratio of a curvature radius of the film bonding surface to a bonding aperture of the film bonding surface is greater than <NUM>; or when a film bonding surface of the lens <NUM> is a concave surface, a ratio of a curvature radius of the film bonding surface to a bonding aperture of the film bonding surface is greater than <NUM>, to ensure that no wrinkle is generated when the film <NUM> is bonded to the lens <NUM>. It should be noted that In this implementation of this application, when the film bonding surface is a spherical surface, a curvature radius of the film bonding surface is a curvature radius of the film bonding surface being the spherical surface; or when the film bonding surface is an aspheric surface or a free curved surface, a curvature radius of the film bonding surface is a curvature radius of a spherical surface closest to the surface shape of the film bonding surface obtained by fitting the film bonding surface. The bonding aperture of the film bonding surface is a size of a projection generated through an orthographic projection of the film to a plane perpendicular to an optical axis of the lens when the film <NUM> is bonded to the lens <NUM>.

Referring to <FIG> again, in some implementations of this application, the driving mechanism <NUM> includes a first driving mechanism <NUM> and a second driving mechanism <NUM>. The first driving mechanism <NUM> is connected to the first jig <NUM>, and the second driving mechanism <NUM> is connected to the second jig <NUM>. The first driving structure <NUM> is configured to drive the first jig <NUM> to move toward the second jig <NUM>, and the second driving mechanism <NUM> is configured to drive the second jig <NUM> to move toward the first jig <NUM>, so that the film <NUM> fastened to the second jig <NUM> is bonded to the lens <NUM> fastened to the first jig <NUM>.

In this implementation of this application, each of the first driving mechanism <NUM> and the second driving mechanism <NUM> may be a driving mechanism such as a screw rod driving mechanism, a guide rail driving mechanism, or a cylinder driving mechanism. Specifically, in the implementation shown in <FIG>, the first driving structure <NUM> is a guide rail driving mechanism, and the guide rail driving mechanism includes a guide rail <NUM> and a guide rail motor <NUM> connected to one end of the guide rail <NUM>. The first jig <NUM> is connected to the guide rail <NUM>, and can move along the guide rail <NUM> under driving of the guide rail motor <NUM>. The second driving mechanism <NUM> is a cylinder driving mechanism. The cylinder driving mechanism includes a cylinder <NUM> and a connecting rod <NUM> connected to the cylinder <NUM>. The second jig <NUM> is connected to an end of the connecting rod <NUM> away from the cylinder <NUM>. Under driving of the cylinder <NUM>, the second jig <NUM> can move in an extending direction of the connecting rod <NUM>. In this implementation, the extending direction of the connecting rod <NUM> is a direction in which the second jig <NUM> faces the first jig <NUM>.

It may be understood that, in another implementation of this application, each of the first driving mechanism <NUM> and the second driving mechanism <NUM> may alternatively be another type of driving mechanism, to generate relative movement under driving of the driving mechanisms.

Referring to <FIG>, in some other implementations of this application, the driving mechanism <NUM> further includes a third driving structure <NUM>. The third driving mechanism <NUM> is connected to the clamping member <NUM>, to drive the clamping member <NUM> to clamp or release the carrier film <NUM>. It may be understood that, in this implementation, the clamping member <NUM> may also be various types of driving mechanisms such as a screw rod driving mechanism, a guide rail driving mechanism, and a cylinder driving mechanism.

Referring to <FIG> and <FIG> again, in some other implementations of this application, the device <NUM> for bonding a film to a lens may further include a first cavity <NUM> and a second cavity <NUM> that is used in collaboration with the first cavity <NUM>. In some implementations of this application, the first jig <NUM> is located in the first cavity <NUM>, and the second jig <NUM> is located in the second cavity <NUM>. The first cavity <NUM> and the second cavity <NUM> are disposed opposite to each other, and the first cavity <NUM> and the second cavity <NUM> can move relative to each other until the first cavity <NUM> and the second cavity <NUM> are jointed together in a covering manner to form a confined space, so that the first jig <NUM> and the second jig <NUM> are located in the confined space, and a process of bonding the film <NUM> to the lens <NUM> is performed in the confined space, thereby preventing external impurities from entering between the film <NUM> and the lens <NUM>, and improving bonding quality. In addition, in some implementations, the confined space can be connected to the vacuumization device, and the vacuumization device vacuumizes the confined space to form a vacuum environment, thereby further avoiding generating a bubble between the film and the lens when the film <NUM> is bonded to the lens <NUM>, and further improving quality of bonding between the film <NUM> and the lens <NUM>.

In this implementation, the first jig <NUM> is located in the first cavity <NUM>, and the first driving mechanism <NUM> is connected to the first cavity <NUM> to drive the first cavity <NUM> to move relative to the second cavity <NUM>. In this implementation, the first jig <NUM> can move through the connection between the first cavity <NUM> and the first driving mechanism <NUM>.

This application further provides a method for bonding a film to a lens, to bond a film <NUM> to a lens <NUM>. In this implementation of this application, through the device <NUM> for bonding a film to a lens, the film <NUM> can be to film bonding surfaces in different shapes of different lenses <NUM>. Specifically, in this application, using an example in which the film <NUM> is bonded to the lens <NUM> whose film bonding surface is a convex surface through the device <NUM> for bonding a film to a lens shown in <FIG>, and using an example in which the film <NUM> is bonded to the lens <NUM> whose film bonding surface is a concave surface through the device <NUM> for bonding a film to a lens shown in <FIG>, a method for bonding the film <NUM> of the lens <NUM> in this application is described. Referring to <FIG> is a schematic flowchart of a method for bonding a film <NUM> of a lens <NUM> according to some implementations of this application. In this implementation of this application, the bonding method for bonding the film <NUM> to the lens <NUM> specifically includes:
Step <NUM>: Fasten the lens <NUM> to a first jig <NUM>.

In this implementation of this application, the lens <NUM> is mounted in the first jig <NUM>, to fasten the lens <NUM>. In addition, when the lens <NUM> is mounted in the first jig <NUM>, a film bonding surface of the lens <NUM> to which the film <NUM> needs to be bonded is away from the first jig <NUM>, to facilitate subsequent bonding of the film.

In this implementation of this application, the film bonding surface of the lens <NUM> may be a convex surface, a concave surface, or a plane. For example, in the implementation shown in <FIG>, the film bonding surface of the lens <NUM> fastened to the first jig <NUM> is a convex surface. In the implementation shown in <FIG>, the film bonding surface of the lens <NUM> fastened to the first jig <NUM> is a concave surface.

Step <NUM>: Fasten the film <NUM> to a second jig <NUM>.

In this implementation of this application, the film <NUM> is fastened to a film carrying zone <NUM> of the second jig <NUM>, to fasten the film <NUM>. In some implementations, when the film <NUM> is fastened to the second jig <NUM> of the device <NUM> for bonding a film in the implementation shown in <FIG>, the fastening the film <NUM> to the second jig <NUM> specifically includes:
transferring the film <NUM> to the film carrying zone <NUM> of the second jig <NUM>, and enabling the vacuumization device, so that the film <NUM> is fastened to the film carrying zone <NUM> of the second jig <NUM> under vacuum adsorption force of the vacuum holes <NUM>.

In the implementation shown in <FIG>, the film carrying zone <NUM> of the second jig <NUM> is a plane, and the film <NUM> of the plane is tiled in the film carrying zone <NUM> under vacuum adsorption force of the vacuum holes <NUM>. It may be understood that, in some other implementations of this application, the film carrying zone <NUM> may alternatively be a concave surface, and a curvature radius of the concave surface is greater than a curvature radius of the film bonding surface of the lens <NUM>.

Referring to <FIG> is a flowchart of specific operations of fastening a film to a second jig <NUM> when the film <NUM> is bonded to a lens <NUM> through the device <NUM> for bonding a film shown in <FIG>. In some other implementations of this application, when the film <NUM> is fastened to the second jig <NUM> of the device <NUM> for bonding a film in the implementation shown in <FIG>, the fastening the film <NUM> to the second jig <NUM> specifically includes:
Step <NUM>: Fasten the film <NUM> to a carrier film <NUM>.

Specifically, the film <NUM> is fastened to the carrier film <NUM> by using an adhesive material, to carry the film <NUM> by using the carrier film <NUM>. The carrier film <NUM> is made of a flexible material, and the carrier film <NUM> can be bent and deformed. In some implementations of this application, the adhesive material for fastening the film <NUM> to the carrier film <NUM> is an ultraviolet-sensitive optically clear adhesive. After the film <NUM> is bonded to the lens <NUM>, the carrier film <NUM> may be peeled from the film <NUM> through ultraviolet exposure.

In this implementation, by carrying the film <NUM> through the carrier film <NUM>, the film <NUM> can be protected from being easily damaged in a subsequent process of being transferred to the film carrying zone <NUM> of the second jig <NUM>, and the film <NUM> can be more easily transferred.

Step <NUM>: Transfer the film <NUM> through the carrier film <NUM> until the film <NUM> is opposite to the film carrying zone <NUM> of the second jig <NUM>, and clamp the carrier film <NUM> on two sides of the film <NUM> by using a clamping member <NUM>, to ensure that a part of the carrier film <NUM> carrying the film <NUM> can be tightened.

In some implementations, the film <NUM> can be transferred to a position opposite to the film carrying zone <NUM> of the second jig <NUM> in a manner of winding through a pulley. In addition, when the film <NUM> is transferred to the position opposite to the film carrying zone <NUM> of the second jig <NUM>, two sides of the film <NUM> on the carrier film <NUM> are clamped by using the clamping member <NUM>, and the clamping member <NUM> on the two sides of the film <NUM> ensures that a part of the carrier film <NUM> carrying the film <NUM> is kept in a tightened state, thereby ensuring that the film <NUM> located on the carrier film <NUM> is in an expanded state, to facilitate a subsequent film bonding process.

Step <NUM>: Drive the film <NUM> on the carrier film <NUM> to move relative to the second jig <NUM>, until the carrier film <NUM> moves to come into contact with the second jig <NUM>.

In this application, the driving the film <NUM> on the carrier film <NUM> to move relative to the second jig <NUM> may be keeping the second jig <NUM> motionless, and moving the clamping member <NUM> that clamps the carrier film <NUM>, to drive the carrier film <NUM> and the film <NUM> located on the carrier film <NUM> to move toward the second jig <NUM>, until the carrier film <NUM> moves to come into contact with the second jig <NUM>. Alternatively, the driving the film <NUM> on the carrier film <NUM> to move relative to the second jig <NUM> may be keeping a position on the carrier film <NUM> unchanged, and moving the second jig <NUM> toward the carrier film <NUM> until the carrier film <NUM> moves to come into contact with the second jig <NUM>.

Step <NUM>: Enable a vacuumization device in communication with vacuum holes <NUM> of the second jig <NUM>, to adsorb and fasten, through vacuum suction, a part of the carrier film <NUM> corresponding to a position on the film <NUM> to the film carrying position <NUM> of the second jig <NUM>, to fasten the film <NUM> to the film carrying position <NUM> of the second jig <NUM>.

In some implementations of this application, the film carrying zone <NUM> is a convex surface. When the vacuumization device is enabled to fasten the carrier film <NUM> and the film <NUM> on the carrier film <NUM> to the film carrying position <NUM> through the vacuum adsorption force at positions on the vacuum holes <NUM>, the clamping members <NUM> on the two sides of the film <NUM> may be further moved toward the second jig <NUM>, to tighten positions on the carrier film <NUM> on the two sides of the film <NUM> by using the clamping members <NUM>, ensure that two ends of the film <NUM> carried on the carrier film <NUM> can be more firmly bonded to the film carrying position <NUM>, avoid a problem that the two ends of the film <NUM> are warped due to insufficient vacuum adsorption force, and ensure a bonding effect of the film <NUM>.

It may be understood that, in the method for bonding a film to a lens in this application, a sequence of step <NUM> and step <NUM> may be randomly changed, that is, step <NUM> may be performed before step <NUM>; step <NUM> may be performed before step <NUM>; or step <NUM> and step <NUM> may be performed simultaneously.

Referring to <FIG> again, after step <NUM> is completed, the method further includes step <NUM>: Obtain boundary information of a full aperture of the lens <NUM>, to align the lens <NUM> with the first jig <NUM>.

In some implementations of this application, the device <NUM> for bonding a film to a lens further includes a first alignment camera. The first alignment camera has high resolution, and a photographing range of the first alignment camera can cover a range of the full aperture of the lens <NUM>, so that the boundary information of the full aperture of the lens <NUM> can be obtained. The boundary information of the full aperture of the lens <NUM> is obtained through the high-resolution alignment camera, to accurately obtain a central position on the lens <NUM>. The lens <NUM> is moved to cause the central position on the lens <NUM> to be opposite to a central position on the lens carrying zone <NUM> of the first jig <NUM>, that is, a connection line between the central position on the lens <NUM> and the central position on the lens carrying zone <NUM> of the first jig <NUM> is collinear with an optical axis of the lens <NUM>. In this way, the lens <NUM> is aligned with the first jig <NUM>. The obtaining the boundary information of the full aperture of the lens <NUM> through the high-resolution first alignment camera is specifically: moving the first alignment camera until the first alignment camera is right above the lens <NUM> and has a lens direction facing the lens <NUM>; and photographing the full aperture of the lens <NUM> through the high-resolution first alignment camera, and obtaining imaging boundary information of the lens <NUM> through a processor, to obtain the boundary information of the full aperture of the lens <NUM>. Central position information of the lens <NUM> is obtained through calculation by using the boundary information, to obtain the central position on the lens <NUM>. Specifically, in this implementation, the first alignment camera is a charge coupled device (charge coupled device, CCD) camera. In this implementation, the photographing range of the first alignment camera can cover the range of the full aperture of the lens <NUM>, to accurately obtain the central position on the lens <NUM>. Compared with a manner in which only some positions on the lens <NUM> are identified and aligned, in this implementation of this application, the photographing the full aperture of the lens <NUM> can ensure accuracy of alignment between the lens <NUM> and the first jig <NUM>. In some implementations of this application, precision of alignment between the lens <NUM> and the first jig <NUM> may reach <NUM> to <NUM>.

Step <NUM>: Obtain boundary information of a full aperture of the film <NUM>, to align the film <NUM> with the second jig <NUM>.

In some implementations of this application, the device <NUM> for bonding a film to a lens further includes a second alignment camera. The second alignment camera has high resolution, and a photographing range of the second alignment camera can cover a range of the full aperture of the film <NUM>, so that the boundary information of the full aperture of the film <NUM> can be obtained. The boundary information of the full aperture of the film <NUM> is obtained through the high-resolution alignment camera, to accurately obtain a central position on the film <NUM>. The film <NUM> is moved to enable the center of the film <NUM> to be opposite to the central position on the second jig <NUM>, that is, a connection line between the center of the film <NUM> and the center of the second jig <NUM> is perpendicular to the film <NUM>, thereby implementing alignment between the film <NUM> and the second jig <NUM>. The obtaining the boundary information of the full aperture of the film <NUM> through the high-resolution second alignment camera is specifically: moving the second alignment camera until the second alignment camera is right above the film <NUM> and has a lens direction facing the film <NUM>; and then photographing the full aperture of the film <NUM> through the high-resolution second alignment camera, and obtaining imaging boundary information of the film <NUM> through a processor, to obtain the boundary information of the full aperture of the film <NUM>. Central position information of the film <NUM> is obtained through calculation by using the boundary information of the full aperture of the film <NUM>, to obtain the central position on the film <NUM>. Specifically, in this implementation, the second alignment camera is a charge coupled device (charge coupled device, CCD) camera. In this implementation, the photographing range of the second alignment camera can cover a full range of the film <NUM>, so that the boundary information of the full aperture of the film <NUM> can be obtained, to accurately obtain the central position on the film <NUM>. Compared with a manner in which only some positions on the film <NUM> are identified and aligned, in this implementation of this application, the photographing the full aperture of the film <NUM> ensures accuracy of alignment between the film <NUM> and the second jig <NUM>. In some implementations of this application, precision of alignment between the film <NUM> and the second jig <NUM> may reach <NUM> to <NUM>.

It should be noted that in this implementation of this application, alignment between the lens <NUM> and the first jig <NUM> may be implemented by using the first alignment camera, alignment between the film <NUM> and the second jig <NUM> may be implemented by using the second alignment camera, and there is no mutual impact. Therefore, step <NUM> and step <NUM> may be performed simultaneously, thereby improving film bonding efficiency. It may be understood that, in another implementation of this application, alignment between the lens <NUM> and the first jig <NUM> and alignment between the film <NUM> and the second jig <NUM> may be implemented by using a same alignment camera. To be specific, after implementing alignment between the lens <NUM> and the first jig <NUM>, the alignment camera moves to a position corresponding to the second jig <NUM>, and then performs alignment between the film <NUM> and the second jig <NUM>. In this case, step <NUM> is first completed, and then step <NUM> is completed; or step <NUM> is completed first, and then step <NUM> is completed.

Step <NUM>: Control the first jig <NUM> and the second jig <NUM> to move relative to each other, to gradually bond a middle position to an edge position on the lens <NUM> to the film <NUM>.

In this implementation of this application, the second jig <NUM> may be kept motionless, and the control mechanism <NUM> controls the first jig <NUM> to move to gradually approach the second jig <NUM>; or the first jig <NUM> may be kept motionless, and the control mechanism <NUM> controls the second jig <NUM> to gradually approach the first jig <NUM>, so that the middle position to the edge position on the lens <NUM> are gradually bonded to the film <NUM>. Alternatively, in some implementations, the control mechanism <NUM> may control the first jig <NUM> to move by a specific distance, and control the second jig <NUM> to move by a specific distance, so that the middle position to the edge position on the lens <NUM> are gradually bonded to the film <NUM>. Specifically, in the implementation shown in <FIG>, the first control mechanism <NUM> of the control mechanism <NUM> first controls the first cavity <NUM> to move toward the second cavity <NUM>, so that the first jig <NUM> moves toward the second jig <NUM> by some distance. The first control mechanism <NUM> controls the first cavity <NUM> to move toward the second cavity <NUM> until the first cavity <NUM> and the second cavity <NUM> are jointed together in a covering manner, and a confined space formed by joining the first cavity <NUM> and the second cavity <NUM> together in the covering manner is vacuumized, so that a subsequent process of bonding the film <NUM> to the lens <NUM> can be performed in a vacuum environment, to avoid generating a bubble between the film <NUM> and the lens <NUM> when the film <NUM> is bonded to the lens <NUM>. Then, the second control mechanism <NUM> of the control mechanism <NUM> controls the second jig <NUM> to move toward the first jig <NUM>, so that the middle position to the edge position on the lens <NUM> are gradually bonded to the film <NUM>.

In this implementation of this application, because the second jig <NUM> is a flexible jig, in a process of moving the first jig <NUM> toward the second jig <NUM>, the middle position on the lens <NUM> first comes into contact with the film <NUM>. As the first jig <NUM> further moves toward the second jig <NUM>, the second jig <NUM> is gradually deformed, so that the middle position to the edge position on the lens <NUM> gradually come into contact with and are bonded to the film <NUM>.

It should be noted that in the device <NUM> for bonding a film to a lens in the implementations shown in <FIG> and <FIG>, the first jig <NUM> and the second jig <NUM> are disposed opposite to each other. Therefore, the controlling the first jig <NUM> and the second jig <NUM> to move relative to each other, to gradually bond the middle position to the edge position on the lens <NUM> to the film <NUM> mentioned in step <NUM> is: controlling the first jig <NUM> and the second jig <NUM> to move opposite to each other, to gradually bond the middle position to the edge position on the lens <NUM> to the film <NUM>. In some other implementations of this application, when the first jig <NUM> and the second jig <NUM> in the device <NUM> for bonding a film to a lens are disposed in parallel, the controlling the first jig <NUM> and the second jig <NUM> to move relative to each other, to gradually bond the middle position to the edge position on the lens <NUM> to the film <NUM> mentioned in step <NUM> is: overturning the first jig <NUM> or the second jig <NUM>, to dispose the second jig <NUM> and the first jig <NUM> opposite to each other; and then controlling the first jig <NUM> and the second jig <NUM> to move opposite to each other, to gradually bond the middle position to the edge position on the lens <NUM> to the film <NUM>.

In this implementation of this application, the planar film <NUM> gradually comes into contact with and is bonded to the lens <NUM> from the middle position to the edge position, so that the planar film <NUM> from the middle position to the edge position can be evenly deformed, thereby avoiding a case that after the planar film <NUM> is bonded to the lens <NUM>, optical performance, mechanical performance, and the like of the film <NUM> are changed, and consequently, optical performance and mechanical performance of an optical element finally obtained through bonding are affected. For example, in some implementations of this application, the film <NUM> is an optical film having an optical axis, such as a reflective polarization film, a quarter-wave plate, or a half-wave plate. According to the method for bonding a film in this implementation of this application, an optical axis offset between a central position and an edge position on the film <NUM> generated after the film <NUM> is bonded can be less than or equal to ±<NUM>°, and an optical performance difference between the center and the edge of the film <NUM> can be less than or equal to ±<NUM>%. In addition, the method for bonding a film <NUM> in this application is easy to operate, and does not need to first heat the planar film <NUM> into a curved film with an ideal shape through processes such as heating, pressure preservation, stretching, and softening, and then bond the curved film <NUM> to the lens <NUM>, thereby avoiding a case that optical performance or mechanical performance of the bonded film <NUM> is affected due to the processes such as heating, pressure preservation, stretching, and softening while simplifying the bonding method.

In some implementations of this application, before the "gradually bonding a middle position to an edge position on the lens to the film" in step <NUM>, the method further includes:
Step <NUM>: Heat the film <NUM> by using the second jig <NUM>.

In this implementation of this application, the film <NUM> can be softened by heating the film <NUM>, so that the film <NUM> can be better bonded to a film carrying zone <NUM>. In addition, in a process of bonding the film <NUM> to the lens <NUM>, because the film <NUM> can be more easily deformed after being heated, the film <NUM> can be bonded to a surface of the lens <NUM> flatly, thereby avoiding a problem such as a wrinkle that occurs when the film <NUM> is bonded to the film bonding surface of the lens <NUM>. In addition, in this implementation of this application, all positions on the film <NUM> are evenly heated by using the second jig <NUM>, to ensure that the positions on the film <NUM> can have a same deformation capability, and avoid a wrinkle or a change in an optical axis direction caused by uneven stretching of the positions on the film <NUM>, thereby ensuring quality of an optical element finally obtained by bonding the film. In addition, the film <NUM> is heated by using the second jig <NUM>. Because the second jig <NUM> has a specific heat preservation function, the film <NUM> can be heated in an entire bonding process, to ensure that the film <NUM> can always be in a heated state in the process of bonding the film <NUM> to the lens <NUM>, thereby achieving a better bonding effect.

In this implementation of this application, the device <NUM> for bonding a film to a lens includes a film heater <NUM>. The film heater <NUM> is fastened to a side that is of the second jig <NUM> and that is away from the film <NUM>. During working, the film heater <NUM> heats the second jig <NUM>, so that heat generated by the film heater <NUM> is transferred to the second jig <NUM>, and then the film <NUM> is heated by using the second jig <NUM>. In this implementation, because the second jig <NUM> has a specific heat preservation effect, after the film heater <NUM> is stalled out, the second jig <NUM> can still continuously heat the film <NUM>, thereby reducing energy consumption. In some implementations of this application, the second jig <NUM> can generate a heating temperature of <NUM> to <NUM>, to ensure that the second jig <NUM> can fully heat the film <NUM>, to ensure that the film <NUM> can have a good bonding effect with the lens <NUM>.

In some implementations of this application, before the "gradually bonding a middle position to an edge position on the lens to the film" in step <NUM>, the method further includes:
Step <NUM>: Heat the lens <NUM> by using the first jig <NUM>.

In this implementation of this application, the lens <NUM> is heated, so that a temperature difference between the film <NUM> and the lens <NUM> can be reduced in the process of bonding the film <NUM> to the lens <NUM>, to ensure that a stress between the film <NUM> and the lens <NUM> can be small after the film <NUM> and the lens <NUM> are bonded and cooled, thereby ensuring stability of the bonding between the film <NUM> and the lens <NUM>. In some implementations of this application, a temperature difference between the lens <NUM> and the film <NUM> is less than <NUM>°, so that stability of the bonding between the film <NUM> and the lens <NUM> can be effectively ensured. In this implementation of this application, all positions on the lens <NUM> are evenly heated by using the first jig <NUM>, to ensure a temperature balance between the positions on the lens <NUM> in the process of bonding the film <NUM> to the lens <NUM>. In some implementations, a temperature difference between the lens <NUM> and the film <NUM> is less than <NUM>°, so that stability of the bonding between the film <NUM> and the lens <NUM> can be more effectively ensured.

In some implementations of this application, the device <NUM> for bonding a film to a lens includes a lens heater <NUM>. The lens heater <NUM> is fastened to a side that is of the first jig <NUM> and that is away from the lens <NUM>. During working, the lens heater <NUM> heats the first jig <NUM>, so that heat generated by the lens heater <NUM> is transferred to the first jig <NUM>, and then the lens <NUM> is heated by using the first jig <NUM>. In this implementation, because the first jig <NUM> can have a specific heat preservation effect, after the lens heater <NUM> is stalled out, the first jig <NUM> can still continuously heat the lens <NUM>, thereby reducing energy consumption. In some implementations of this application, the lens heater <NUM> can generate a heating temperature of <NUM> to <NUM>, to ensure that the first jig <NUM> can be fully heated, to reduce a temperature difference between the film <NUM> and the lens <NUM> during bonding.

In this implementation of this application, step <NUM> and step <NUM> may be performed at any time after step <NUM> and before step <NUM>. This is not specifically limited herein. In the implementation shown in <FIG>, step <NUM> and step <NUM> are performed after step <NUM> and before step <NUM>.

In some implementations of this application, after the film <NUM> is bonded to the lens <NUM> in step <NUM>, heat preservation and pressure preservation may be further performed for a specific time on the lens <NUM> to which the film <NUM> is bonded, to ensure firmness of bonding between the film <NUM> and the lens <NUM>. Specifically, in some implementations of this application, after the film <NUM> is bonded to the lens <NUM>, the lens <NUM> to which the film <NUM> is bonded is subjected to heat preservation and pressure preservation for more than <NUM> at a pressure of <NUM> to <NUM> kgf and a temperature of <NUM> to <NUM>.

In some implementations of this application, an adhesive layer and a release film are stacked on the film <NUM>. The adhesive layer can bond the film <NUM> to a surface of the lens <NUM>. In this implementation of this application, the adhesive layer may be various types of transparent adhesive materials such as an optically clear adhesive (optically clear adhesive, OCA) and a pressure sensitive adhesive (pressure sensitive adhesive, PSA). In some implementations of this application, a thickness of the adhesive layer is <NUM> to <NUM>, to ensure that the film <NUM> can be stably bonded to the lens <NUM> by using the adhesive layer, and avoid a case that a thickness of the adhesive layer is excessively large and consequently a thickness and optical performance of an optical element obtained by bonding the lens <NUM> to the film <NUM> are affected.

In some implementations, the adhesive layer for bonding the film <NUM> to the lens <NUM> and the adhesive material for fastening the film <NUM> to the carrier film <NUM> are made of a same material, to ensure that when the carrier film <NUM> is subsequently peeled from the film <NUM>, firmness of bonding between the film <NUM> and the lens <NUM> is not affected.

The release film is also referred to as a peeling film, an isolation film, a separation film, or an adhesive resistant film. The release film can ensure that a coating film layer has specific release force, to protect the adhesive layer. In this implementation, when the film <NUM> is bonded to the lens <NUM>, a release film layer needs to be removed, to bond the film <NUM> to the lens <NUM> by using the adhesive layer. Therefore, in these implementations, before step <NUM>, the method further needs to include the following step: removing the release film from the surface of the film <NUM>.

In this implementation, when the film <NUM> is fastened to the first jig <NUM>, the release film is located on a surface that is of the film <NUM> and that is away from the first jig <NUM>. After the release film is removed, the adhesive layer on the surface of the film <NUM> is opposite to the lens <NUM>. When the lens <NUM> is close to the film <NUM>, the film <NUM> can be bonded to the lens <NUM>.

In some implementations of this application, before step <NUM>, the method further includes:
Step <NUM>: Perform surface activation processing on a surface of the lens <NUM>.

In this implementation of this application, the surface activation processing on the lens <NUM> can generate a polar group (for example, a hydroxy oxide film) on the surface of the lens <NUM> or coarsen the surface of the lens <NUM>, so that the film <NUM> can be more firmly attached to the surface of the lens <NUM>. In some implementations, when the surface activation processing is performed on the surface of the lens <NUM>, the surface of the lens <NUM> is cleaned, to ensure that no impurity exists between the lens <NUM> and the film <NUM> after the film is bonded, and ensure film bonding quality.

In some implementations of this application, activation processing is performed on the surface of the lens <NUM> in a plasma processing manner, and impurities on the surface of the lens <NUM> can be removed. It may be understood that, in some other implementations of this application, the film bonding surface of the lens <NUM> may alternatively be cleaned in another cleaning manner.

In this implementation of this application, step <NUM> may be performed at any moment before step <NUM>. In the implementation shown in <FIG>, step <NUM> is performed before step <NUM>. To be specific, after the surface activation processing is first performed on the film bonding surface of the lens <NUM>, the lens <NUM> is fastened to the first jig <NUM>. It may be understood that, in some other implementations of this application, step <NUM> may be performed at any moment between step <NUM> and step <NUM>. This is not specifically limited herein.

In some implementations of this application, after step <NUM> and before step <NUM>, the method further includes:
Step <NUM>: Obtain the boundary information of the full aperture of the lens <NUM> and the boundary information of the full aperture of the film <NUM>, to align the lens <NUM> with the film <NUM>.

Specifically, in this implementation of this application, alignment between each position on the lens <NUM> and each position on the film <NUM> may be implemented by using a third alignment camera. In some implementations, when the lens <NUM> is aligned with the film <NUM>, the third alignment camera may be moved to a position between the lens <NUM> and the film <NUM> that are disposed opposite to each other, and the boundary information of the full aperture of the lens <NUM> is obtained by using the third alignment camera, to determine the central position on the lens <NUM>. In addition, the boundary information of the full aperture of the film <NUM> is obtained, to determine the central position on the film <NUM>. Then, the first jig <NUM> and the second jig <NUM> are moved relative to each other, so that the central position on the lens <NUM> is opposite to the central position on the film <NUM>, thereby aligning the lens <NUM> with the film <NUM>. In this implementation, before the film <NUM> is bonded to the lens <NUM>, the film <NUM> is aligned with the lens <NUM>, so that precision of bonding the film <NUM> to the lens <NUM> can be further improved.

It should be noted that after the third alignment camera completes alignment between the lens <NUM> and the film <NUM>, the third alignment camera may be moved to leave the position between the lens <NUM> and the film <NUM>, to prevent the third alignment camera from blocking relative movement between the lens <NUM> and the film <NUM> during bonding.

It may be understood that, in some other implementations of this application, step <NUM> may alternatively not be performed, and the film <NUM> and the lens <NUM> are aligned through structurally precise fit between the first jig <NUM> and the second jig <NUM>.

In some implementations of this application, after step <NUM> is completed, the method may further include:
Step <NUM>: Unfasten the lens <NUM> from the first jig <NUM>, and unfasten the film <NUM> from the second jig <NUM>.

Specifically, for the device <NUM> for bonding a film to a lens in the implementation shown in <FIG>, the unfastening the film <NUM> from the second jig <NUM> includes: disabling the vacuumization device, so that the second jig <NUM> generates no vacuum adsorption force on the film <NUM>, to unfasten the film <NUM> from the second jig <NUM>. For the device <NUM> for bonding a film to a lens in the implementation shown in <FIG>, the unfastening the film <NUM> from the second jig <NUM> includes: disabling the vacuumization device, so that the second jig <NUM> generates no vacuum adsorption force on the film <NUM>; and loosening the carrier film <NUM> from clamping of the clamping member <NUM>, to unfasten the film <NUM> from the second jig <NUM>.

Step <NUM>: Perform debubbling processing on the lens <NUM> to which the film <NUM> is bonded.

Specifically, in some implementations of this application, the film bonding jig <NUM> further includes a debubbling jig. The lens <NUM> that is taken out from the first jig <NUM> and the second jig <NUM> and to which the film <NUM> is bonded is placed in the debubbling jig, and pressure preservation and heat preservation processing is performed on the lens <NUM> to which the film <NUM> is bonded, to make it convenient to discharge a bubble between the film <NUM> and the lens <NUM>, and ensure optical quality of the optical element. In this implementation, when the pressure preservation and heat preservation processing is performed on the film <NUM>, a pressure is <NUM> MPa to <NUM> MPa, a temperature is <NUM> to <NUM>, and a heat preservation and pressure preservation time is <NUM> to <NUM>, to ensure that a bubble between the film <NUM> and the lens <NUM> can be discharged, and the temperature, the pressure, and the time of the heat preservation and pressure preservation can be controlled, to avoid impact of a debubbling process on optical performance of the optical element.

Specifically, in some implementations of this application, the film bonding jig <NUM> further includes a transfer mechanism such as a robotic arm or a belt pulley. The lens <NUM> to which the film <NUM> is bonded is taken out from the first jig <NUM> and the second jig <NUM> by using the transfer mechanism such as a robotic arm or a belt pulley, and is placed in the debubbling jig for debubbling processing.

Claim 1:
A method for bonding a film to a lens, wherein the method for bonding a film comprises:
fastening (<NUM>) the lens to a first jig;
fastening (<NUM>) the film to a second jig, wherein the second jig is a deformable flexible jig;
obtaining (<NUM>) boundary information of a full aperture of the lens, to align the lens with the first jig;
obtaining (<NUM>) boundary information of a full aperture of the film, to align the film with the second jig; and
controlling (<NUM>) the first jig and the second jig to move relative to each other, to gradually bond a middle position to an edge position on the lens to the film.